Search for: [Coverage = "289"]

List of Referees

Central European Journal of Economic Modelling and Econometrics | 2012 | No 4 | 289 | DOI: 10.24425/cejeme.2012.119288

Download PDF Download RIS Download Bibtex

Cross-border Transfer of a Seat, Cross-border Conversion or the Coming into Existence of a New Company? Doubts Against the Background of the Court of Justice’s Judgment in C-106/16 Polbud – Wykonawstwo Sp. z o.o.

Sylwia Majkowska-Szulc Arkadiusz Wowerka

Polish Yearbook of International Law | 2018 | No XXXVIII | 275-289 | DOI: 10.24425/pyil.2019.129616

Keywords cross-border transfer of seat cross-border conversion of company mobility of companies EU freedom of establishment conflict-of-laws statutory seat real seat registered office continuation of legal personality company’s liquidation protection of creditors protection of minority shareholders

Download PDF Download RIS Download Bibtex

Abstract

This article focuses on mobility of companies in the European Union in the light of the Court of Justice’s judgment in the C-106/16 Polbud – Wykonawstwo sp. z o.o. case. The Court of Justice has once again interpreted the treaty provisions relating to the EU freedom of establishment in the context of cross-border conversion of companies. The in-depth analysis of the case from the substantive law perspective as well as from the conflict-of-law perspective has raised some doubts with regard to the background of the judgment. Therefore, the article assesses whether the cross-border transfer of a seat took place in the Polbud case or the cross-border conversion, or possibly a new company has come into existence. Most of the analysis is aimed at exposing the risks related to the companies’ mobility under the rules adopted in the Polbud judgment, in particular in the absence of respective European and national regulation.

Go to article

Authors and Affiliations

Sylwia Majkowska-Szulc

Arkadiusz Wowerka

Failure Characteristics of W Strap in Coal Mine Support

Xiaowei Feng Fei Xue Xiaotian Feng Tongyang Zhao

Archives of Mining Sciences | 2022 | vol. 67 | No 2 | 289-302 | DOI: 10.24425/ams.2022.141459

Keywords W strap field observation laboratory tests coal mine support failure characteristics

Download PDF Download RIS Download Bibtex

Abstract

W strap is a crucial surface support component for underground coal mine roadways. In this study, the failure characteristics of the W strap in the field are discussed, and the loading characteristics of the strap and the faceplate are numerically and experimentally analysed. Afterwards, a loading apparatus capable of reappearing the loading environment of the strap in the field is fabricated. This loading device, combined support systems consisting of a bolt, faceplate and strap is tested under different simulated strata conditions. Failure patterns of the strap are evaluated by the 3D scanning method, and proper selection of a faceplate is explored. Results indicate that a domed faceplate can achieve a favourable supporting effect on strata, and thus it is favoured compared with a square domed faceplate. In addition, rock cavity and rock integrity beneath the strap are essential factors determining the servicing life of the overall supporting system.

Go to article

Authors and Affiliations

Xiaowei Feng

1

e-mail:

ORCID:

Fei Xue

2

e-mail:

ORCID:

Xiaotian Feng

3

e-mail:

ORCID:

Tongyang Zhao

2

e-mail:

ORCID:

China University of Mining and Technology, China
Shaoxing University, Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, China
Xi’an University of Architecture and Technology, Politecnico di Milano, China

Significant predictors of psychological distress in the group of Polish young adults during the COVID-19 epidemic outbreak: Sequential mediation model

Beata Mirucka Urszula Bielecka Maria Mirucka Natalia Kępińska

Polish Psychological Bulletin | 2021 | vol. 52 | No 3 | 289-298 | DOI: 10.24425/ppb.2021.137891

Keywords coronavirus psychological distress state anxiety risk perception young adults

Download PDF Download RIS Download Bibtex

Abstract

The study was conducted to identify significant predictors of psychological distress in the group of young Polish adults during COVID-19 epidemic outbreak. The web-based cross-sectional survey was applied to 975 Polish respondents (755 female, 77.44%) aged 18-35 years. They were divided into two age groups: younger (18-25) and older (25-35). All participants completed: General Functioning Questionnaire (GFQ), COVID-19 Risk Perception Scale (C-RPS), State Anxiety Inventory (STAI-S), and General Sense of Threat to Life Scale (GSTLS). The Polish adults aged 18-25 years manifested significantly higher psychological distress, state anxiety, and a sense of threat to life, but they perceived less risk in COVID-19 epidemic compared to older participants. Risk perception and a sense of threat to life were indirectly related to state anxiety and psychological distress. Significant predictors of psychological distress in the group of young adult Poles during the COVID-19 epidemic are: state anxiety, risk perception, and a sense of threat to life, where risk perception and a sense of threat to life mediate the relation between state anxiety and psychological distress.

Go to article

Bibliography

Ahmed, M. Z., Ahmed, O., Aibao, Z., Hanbin, S., Siyu, L., & Ahmad, A. (2020). Epidemic of COVID-19 in China and associated Psychological Problems. Asian Journal of Psychiatry, 51. https://doi.org/10.1016/j.ajp.2020.102092
Bradley, B. P., Mogg, K., & Millar, N. H. (2000). Covert and overt orienting of attention to emotional faces in anxiety. Cognition and Emotion, 14(6), 789–808. https://doi:10.1080/02699930050156636
Bareket-Bojmel, L., Shahar, G., & Margalit, M. (2020). COVID-19- Related Economic Anxiety Is As High as Health Anxiety: Findings from the USA, the UK, and Israel. International Journal of Cognitive Therapy. https://doi.org/10.1007/s41811-020-00078-3
Ben-Zur, H., & Zeidner, M. (2009). Threat to life and risk-taking behaviors: A review of empirical findings and explanatory models Personality and Social Psychology Review, 13(2), 109–128. https://doi.org/10.1177/1088868308330104
Boyraz, G., & Legros, D. N. (2020). Coronavirus Disease (COVID-19) and Traumatic Stress: Probable Risk Factors and Correlates of Posttraumatic Stress Disorder. Journal of Loss and Trauma, 25(6-7), 503-522, 1–20. https://doi.org/10.1080/15325024.2020.1763556
Bults, M., Beaujean, D. J. M. A., De Zwart, O., Kok, G., Van Empelen, P., Van Steenbergen, J. E., Richardus, J. H., & Voeten, H. A. C. M. (2011). Perceived risk, anxiety, and behavioural responses of the general public during the early phase of the Influenza A (H1N1) pandemic in the Netherlands: Results of three consecutive online surveys. BMC Public Health, 11(1), 2. https://doi.org/10.1186/1471-2458-11-2
Cao, W., Fang, Z., Hou, G., Han, M., Xu, X., Dong, J., & Zheng, J. (2020). The psychological impact of the COVID-19 epidemic on college students in China. Psychiatry Research, 287. https://doi.org/10.1016/j.psychres.2020.112934
Casagrande, M., Favieri, F., Tambelli, R., & Forte, G. (2020). The enemy who sealed the world: Effects quarantine due to the COVID-19 on sleep quality, anxiety, and psychological distress in the Italian population. Sleep Medicine, 75, 12–20. https://doi.org/10.1016/j.sleep.2020.05.011
Cho, H., & Lee, J. S. (2015). The influence of self-efficacy, subjective norms, and risk perception on behavioral intentions related to the H1N1 flu pandemic: A comparison between Korea and the US. Asian Journal of Social Psychology, 18(4), 311–324. https://doi.org/10.1111/ajsp.12104
Drapeau, A., Marchand, A., & Beaulieu-Prevost, D. (2012). Epidemiology of Psychological Distress. Mental Illnesses – Understanding, Prediction and Control, Luciano L'Abate, IntechOpen. https://doi.org/10.5772/30872
Favieri, F., Forte, G., Tambelli, R., & Casagrande, M. (2020). The Italians in the time of coronavirus: Psychosocial aspects of unexpected COVID-19 pandemic. SSRN. https://doi.org/10.2139/ssrn.3576804
Favieri. F., Forte, G., Tambelli, R. & Casagrande, M. (2021). The Italians in the Time of Coronavirus: Psychosocial Aspects of the Unexpected COVID-19 Pandemic. Frontiers in Psychiatry, 12. https://doi.org/10.3389/fpsyt.2021.551924
Forte, G., Favieri, F., Tambelli, R., & Casagrande, M. (2020a). COVID- 19 pandemic in the italian population: Validation of a post-traumatic stress disorder questionnaire and prevalence of PTSD symptomatology. International Journal of Environmental Research and Public Health, 17(11), 1–16. https://doi.org/10.3390/ijerph17114151
Forte, G., Favieri, F., Tambelli, R., & Casagrande, M. (2020b). The Enemy Which Sealed the World: Effects of COVID-19 Diffusion on the Psychological State of the Italian Population. Journal of Clinical Medicine, 9(6), 1802. https://doi.org/10.3390/jcm9061802
Fullana, M. A., Hidalgo-Mazzei, D., Vieta, E., & Radua, J. (2020). Coping behaviors associated with decreased anxiety and depressive symptoms during the COVID-19 pandemic and lockdown. Journal of Affective Disorders, 1(275), 80–81. https://doi.org/10.1016/j.jad.2020.06.027
Gambin, M., Sękowski, M., Woźniak-Prus, M., Cudo, A., Hansen, K., Gorgol, J., Huflejt-Łukasik, M., Kmita, G., Kubicka, K., Łyś, A., Maison, D., Oleksy, T., & Wnuk, A. (2020). Uwarunkowania objawów depresji i lęku uogólnionego u dorosłych Polaków w trakcie epidemii COVID-19 – raport z pierwszej fali badania podłużnego, 1–27. http://psych.uw.edu.pl/wp-content/uploads/sites/98/2020/05/ Uwarunkowania_objawow_depresji_leku_w_trakcie_pandemii_raport.pdf (accessed 30 May 2021).
Gerhold, L. (2020). COVID-19 : Risk perception and coping strategies. Results from a survey in Germany. Interdisciplinary Security Research Group, 1–11. https://doi.org/10.31234/osf.io/xmpk4
Hawryluck, L., Gold, W. L., Robinson, S., Pogorski, S., Galea, S., & Styra, R. (2004). SARS control and psychological effects of quarantine, Toronto, Canada. Emerging Infectious Diseases, 10(7), 1206–1212. https://doi.org/10.3201/eid1007.030703
Hayes, A. F., Montoya, A. K., & Rockwood, N. J. (2017). The analysis of mechanisms and their contingencies: PROCESS versus structural equation modelling. Australasian Marketing Journal (AMJ), 25(1), 76-81. https://doi:10.1016/j.ausmj.2017.02.001
Huang, Y., & Zhao, N. (2020). Generalized anxiety disorder, depressive symptoms and sleep quality during COVID-19 outbreak in China: a web-based cross-sectional survey. Psychiatry Research, 288. https://doi.org/10.1016/j.psychres.2020.112954
Knight, R.G., Waal-Manning, H., & Spears, G.D. (1983). Some norms and reliability data for the State-Trait Anxiety Inventory and the Zung Self-Rating Depression scale. British Journal of Clinical Psychology, 22, 245-249. https://doi.org/10.1111/j.2044-8260.1983.tb00610.x
Okruszek, Ł., Aniszewska-Stańczuk, A., Piejka, A., Wiśniewska, M., & Żurek, K. (2020). Safe but lonely? Loneliness, mental health symptoms and COVID-19. PsyArXiv. https://doi.org/10.31234/osf.io/9njps
Qiu, J., Shen, B., Zhao, M., Wang, Z., Xie, B., & Xu, Y. (2020). A nationwide survey of psychological distress among Chinese people in the COVID-19 epidemic: Implications and policy recommenda-tions. General Psychiatry, 33(2), 19–21. https://doi.org/10.1136/gpsych-2020-100213
Sosnowski, T., Wrześniewski, K., Jaworowska, A., & Fecenec, D. (2006). Inwentarz Stanu i Cechy Lęku STAI. Warszawa: Wyd. Pracownia Testów Psychologicznych Polskiego Towarzystwa Psychologicznego.
Spielberger, C., Gorsuch, R., Lushene, R., Vagg, P., & Jacobs, G. (1983). Manual for the State-Trait Anxiety Inventory. Palo Alto, CA: Consulting Psychologists Press.
Styla, R., & Kowalski, J. (2020). Psychometric properties of the General Functioning Questionnaire (GFQ-58) used for screening for symptoms of psychopathology and overall level of functioning. Psychiatria Polska, 54(1), 83–100. https://doi.org/10.12740/PP/99564
Sun, N., Wei, L., Shi, S., Jiao, D., Song, R., Ma, L., Wang, H., Wang, C., Wang, Z., You, Y., Liu, S., & Wang, H. (2020). A qualitative study on the psychological experience of caregivers of COVID-19 patients. American Journal of Infection Control, 48(6), 592–598. https://doi.org/10.1016/j.ajic.2020.03.018
Tabri N., Hollingshead, S., & Wohl, M. (2020). Framing COVID-19 as an existential threat predicts anxious arousal and prejudice towards Chinese people. PsyArXiv. https://doi.org/10.31234/osf.io/mpbtr
Wheaton, M., Abramowitz, J., Berman, N., Fabricant, L., & Olatunji, B. (2012). Psychological predictors of anxiety in response to the H1N1 (Swine Flu) pandemic. Cognitive Therapy and Research, 36(3), 210– 218. https://doi.org/10.1007/s10608-011-9353-3
World Health Organization. (2020). WHO Director-General’s opening remarks at the media briefing on COVID-19. https://www.who.int/dg/speeches/detail/who-director-general-s-opening-remarks-at-the-media-briefing-on-covid-19—11-march-2020 (accessed 5 May 2021).

Go to article

Authors and Affiliations

Beata Mirucka

1

Urszula Bielecka

2

Maria Mirucka

3

Natalia Kępińska

4

John Paul II Catholic University of Lublin, Lublin, Poland
University of Bialystok, Białystok, Poland
University of Warsaw, Warsaw, Poland
SWPS University, Warsaw, Poland

Task difficulty and the use of coping strategies in the FL classroom

Ewa Piechurska-Kuciel

LINGUISTICA SILESIANA | 2011 | vol. 32 | 289-301

Download PDF Download RIS Download Bibtex

Abstract

Learning a foreign language in the context of formal education often imposes on students the management of difficult tasks. This demands an adoption of adequate coping behaviour (achievement vs. avoidance). Easy tasks reduce learning opportunities, while too difficult ones lead to escape-motivated problem behavior. For the purpose of the present research it is proposed that the level of FL task difficulty is related to coping behaviour. The empirical results demonstrate that students who perceive FL tasks as difficult apply more avoidance strategies. Apart from that, students with higher and lower levels of task difficulty use similar amounts of achievement strategies. It follows that the implementation of achievement coping is independent from the level of task difficulty.

Go to article

Authors and Affiliations

Ewa Piechurska-Kuciel

Transmission Perspective on the Mechanism of Coarse and Fine Crackle Sounds

Bing-Yuh Lu Meng-Lun Hsueh Huey-Dong Wu

Archives of Acoustics | 2021 | vol. 46 | No 2 | 289-300 | DOI: 10.24425/aoa.2021.136583

Keywords crackles computer simulation lung sound respiration amplitude modulation frequency modulation

Download PDF Download RIS Download Bibtex

Abstract

The possibility of a normal distribution indicates that few particles are in the same phase during a breath and their reflections can be observed on the chest wall, then a few explosive waves with relatively large power occurr occasionally. Therefore, the one-cycle sine wave which is simulated as a single burst of the explosive effect phenomenon penetrates through the chest wall and was analysed to explore the reason of the crackle sounds. The results explain the differences between the definitions of crackle proposed by Sovijärvi et al. (2000a). The crackles in the lungs were synthesised by a computer simulation. When the coarse crackles occur, the results indicate that higher burst frequency carriers (greater than 100 Hz) directly penetrate the bandpass filter to simulate the chest wall. The simulated coarse crackle sounds were low pitched, with a high amplitude and long duration. The total duration was greater than 10 ms. However, for a lower frequency carrier (approximately 50 Hz), the fundamental frequency component was filtered out. Therefore, the second harmonic component of the lower frequency carrier, i.e., the fine crackle, penetrated the chest wall. Consequently, it is very possible that the normal lung sounds may contain many crackle-shaped waves with very small amplitudes because of the filtering effects of the chest wall, environment noises, electric devices, stethoscopes, and human ears, the small crackles disappear in the auscultations. In addition, our study pointed out that some unknown crackles of the very low frequency under the bandwidth of the human ears cannot penetrate the airways and be detected by medical doctors. Therefore, it might be necessary to focus advanced electronic instrumentation on them in order to analyse their possible characteristics for diagnosis and treatment of the respiration system.

Go to article

Authors and Affiliations

Bing-Yuh Lu

1 2

Meng-Lun Hsueh

3

Huey-Dong Wu

4

Faculty of Automation, Guangdong University of Petrochemical Technology, No. 139, Sec. 2, Guando Road, Maoming City, Guangdong 525000, China
Department of Electronic Engineering, Tungnan University, No. 152, Sec. 3., BeiShen Rd., ShenKeng Dist., New Taipei City 22202, Taiwan (R.O.C.)
Department of Electronic Engineering, Hwa Hsia University of Technology, No. 111, Gongzhuan Rd., Zhonghe Dist., New Taipei City 235, Taiwan (R.O.C.)
Section of Respiration Therapy, Department of Integrated Diagnostics and Therapeutics, National Taiwan University Hospital, No. 7, Zhongshan S. Rd., Zhongzheng Dist., Taipei City 100, Taiwan (R.O.C.)

Speech Analysis as a Tool for Detection and Monitoring of Medical Conditions: A review

Magdalena Igras-Cybulska Daria Hemmerling Mariusz Ziółko Wojciech Datka Ewa Stogowska Michał Kucharski Rafał Rzepka Bartosz Ziółko

Archives of Acoustics | 2023 | vol. 48 | No 3 | 289-315 | DOI: 10.24425/aoa.2023.146640

Keywords speech analysis speech features acoustic parameters linguistic analysis voice biomarkers screening tests

Download PDF Download RIS Download Bibtex

Abstract

The goal of this article is to present and compare recent approaches which use speech and voice analysis as biomarkers for screening tests and monitoring of some diseases. The article takes into account metabolic, respiratory, cardiovascular, endocrine, and nervous system disorders. A selection of articles was performed to identify studies that assess voice features quantitatively in selected disorders by acoustic and linguistic voice analysis. Information was extracted from each paper in order to compare various aspects of datasets, speech parameters, methods of applied analysis and obtained results. 110 research papers were reviewed and 47 databases were summarized. Speech analysis is a promising method for early diagnosis of certain disorders. Advanced computer voice analysis with machine learning algorithms combined with the widespread availability of smartphones allows diagnostic analysis to be conducted during the patient’s visit to the doctor or at the patient’s home during a telephone conversation. Speech analysis is a simple, low-cost, non-invasive and easy-toprovide method of medical diagnosis. These are remarkable advantages, but there are also disadvantages. The effectiveness of disease diagnoses varies from 65% up to 99%. For that reason it should be treated as a medical screening test and should be an indication of the need for classic medical tests.

Go to article

Authors and Affiliations

Magdalena Igras-Cybulska

1 2

e-mail:

ORCID:

Daria Hemmerling

1 2

Mariusz Ziółko

1

Wojciech Datka

3 4

Ewa Stogowska

3

Michał Kucharski

1

Rafał Rzepka

5

Bartosz Ziółko

1 5

Techmo sp. z o.o., Kraków, Poland
AGH University of Science and Technology, Kraków, Poland
Medical University of Bialystok, Białystok, Poland
Faculty of Medicine, Jagiellonian University, Kraków, Poland
Hokkaido University Kita Ward, Sapporo, Hokkaido, Japan

Bioactivity of azadirachtin against Scrobipalpa ocellatella Boyd. (Lepidoptera: Gelechidae) on sugar beet

Somaye Allahvaisi Mahdi Hassani Bahram Heidari

Journal of Plant Protection Research | 2021 | vol. 61 | No 3 | 280-289 | DOI: 10.24425/jppr.2021.137954

Keywords azadirachtin life cycle management sugar beet moth

Download PDF Download RIS Download Bibtex

Abstract

The use of environmentally friendly bio-pesticides is crucial for higher root and sugar yield in sugar beets. The economic importance of beet moth [ Scrobipalpa ocellatella Boyd. (Lep.: Gelechidae)] losses in the field and storage highlight the need for evaluation of appropriate, environmentally friendly methods for pest control. The aims of the present study were to i) assess azadirachin (AZN) effects on the life cycle and activity of the pest, and ii) manage the beet moth on roots under laboratory conditions. For the experiments, the main concentrations were prepared on the basis of the field-recommended dose of this pesticide (1–1.5 l/1000 l water). The LC50 was estimated for 3rd instar larvae. Later, at sublethal concentrations, the relative time for the emergence of each developmental stage was determined. The mean female fecundity was 37% (±4) for treated tests at the lowest AZN concentration (0.5 ml · l–1). AZN at 0.5 ml · l–1 concentration resulted in 62 (±4) deposited eggs per plant for the treated roots and 326 (±1) for roots in the control test. Mortality increased in response to increased AZN concentrations. The results revealed that after 72 h, the highest AZN concentration (2.5 ml · l–1) caused 100% repellency and 82% (±1.38) mortality on 3rd instar larvae. According to our findings, a concentration of 2 ml · l–1 AZN (20 gr active ingredient per 1 hectare) after 4 days affected 1st instar larvae and the larvae with no further development had 92.2% (±1.2) mortality. In conclusion, the results revealed that AZN as a biorational pesticide can significantly minimize the losses of S. ocellatella on sugar beet crops.

Go to article

Bibliography

Abdollahian-Noghabi M., Sharifi H., Babaei B., Bahmani G.A. 2014. Introduction of a new formula for determination of autumn sugar beet purchase price. Journal of Sugar Beet 29: 115–121. DOI: https://doi.org/10.1515/cerce-2015-0013.
Abedi Z., Saber M., Vojoudi S., Mahdavi V., Parsaeyan E. 2014. Acute, sublethal, and combination effects of azadirachtin and Bacillus thuringiensis on the cotton bollworm, Helicoverpa armigera. Journal of Insect Science 14 (1): 30. DOI: https://doi.org/10.1093/jis/14.1.30
Adel M.M., Sehnal F., Ibrahim S.S., Yosef Salem N. 2019. Suneem oil inhibits physiological activity of Spodoptera Littoralis (Boisd.) (Lepidoptera: Noctuidae). EurAsian Journal of BioSciences 13 (2): 1311–1316.
Al-Keridis L.A. 2016. Biology, ecology and control studies on sugar-beet mining moth, Scrobipalpa ocellatella. Der Pharma Chemica 8 (20): 166–171.
Al-Rahimy S.K., Al-Sultany A.K., Murshidy Z.R., Al-Essa R.A., Kadhim Abdul A.R. 2019. Effect of crude extracts of the peels of Musa acuminate L. banana plant in some biological aspects of Culex molestus Forskal (Diptera: Culicidae) with an estimation of the enzymatic effectiveness of Tyrosinase. EurAsian Journal of BioSciences 13 (1): 1–13.
Alouani A., Rehimi N., Soltani N. 2009. Larvicidal activity of a neem tree extract (azadirachtin) against mosquito larvae in the Republic of Algeria. Jordan Journal of Biological Sciences 2 (1): 15–22.
Amin A.H., Helmi A., El-Serwy S.A. 2008. Ecological studies on sugar beet insects at Kafr El-Sheikh Governorate, Egypt. Egyptian Journal of Agricultural Research 86 (6): 2129–2139.
Amoabeng B.W., Johnson A.C., Gurr G.M. 2019. Natural enemy enhancement and botanical insecticide source: a review of dual use companion plants. Applied Entomology and Zoology 54: 1–19. DOI: https://doi.org/10.1007/s13355-018-00602-0
Anonymous. 2020. Final Research Performance Report of Sugar Beet Seed Institute (SBSI) for 2018 Cropping Season. Agricultural Research, Education and Extension Organization (AREEO). Ministry of Jihad-e-Agriculture, Karaj, Iran, 121 pp. (in Persian)
Ascher K.R.S. 1993. Nonconventional insecticidal effects of pesticides available from the neem tree, Azadirachta indica. Archives of Insect Biochemistry and Physiology 22: 433–449. DOI: https://doi.org/10.1002/arch.940220311
Bazazo K.G.I., Mashaal R.E.F. 2014. Pests attacking post-harvest sugar beet roots, and their adverse effects on sugar content. Journal of Plant Protection and Pathology 5: 673–678. DOI: https://doi.org/10.21608/jppp.2014.87978
Bazok R., Drmic Z., Cacija M., Mrganic M., Viric Gasparic H., Lemic D.A. 2018. Moths of Economic Importance in the Maize and Sugar Beet Production. Intech Publications. Chapter 4, 21 pp. DOI: http://dx.doi.org/10.5772/intechopen.78658
Bazok R. 2010. Suzbijanje štetnika u proizvodnji šećerne repe. Glasilo Biljne Zaštite 10 (3): 153–165.
Betz A., Andrew N.R. 2020. Influence of non-lethal doses of natural insecticides spinetoram and azadirachtin on Helicoverpa punctigera (native budworm, Lepidoptera: Noctuidae) under laboratory conditions. Frontiers in Physiology 11: 1089. DOI: https://doi.org/10.3389/fphys.2020.01089
Bezzar-Bendjazia R., Kilani-Morakchi S., Maroua F., Aribi N. 2017. Azadirachtin induced larval avoidance and antifeeding by disruption of food intake and digestive enzymes in Drosophila melanogaster (Diptera: Drosophilidae). Pesticide Biochemistry and Physiology 143: 135–140. DOI: https://doi.org/10.1016/j.pestbp.2017.08.006
Bezzar-Bendjazia R., Kilani-Morakchi S., Aribi N. 2016. Larval exposure to azadirachtin affects fitness and oviposition site preference of Drosophila melanogaster. Pesticide Biochemistry and Physiology 133: 85–90. DOI: https://doi.org/10.1016/j.pestbp.2016.02.009
Bruce Y.A., Gounou S., Chabi-Olaye A., Smith H., Schulthess F. 2004. The effect of neem (Azadirachtaindica indica A. Juss) oil on oviposition, development and reproductive potentials of Sesamia calamistis (Lepidoptera: Noctuidae) and Eldana saccharina Walker (Lepidoptera: Pyralidae). Agricultural and Forest Entomology 6: 223–232. DOI: https://doi.org/10.1111/j.1461-9555.2004.00218.x
Brunherotto R., Vendramim J.D., M.A.G. de. Oriani. 2010. Effects of tomato genotypes and aqueous extracts of Melia azedarach leaves and Azadirachta indica seeds on Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Neotropical Entomology 39: 784–791. DOI: https://doi.org/10.1590/S1519-566X2010000500018
Boadu K.O., Kofi Tulashie S., Akrofi Anang M., Desire Kpan J. 2011. Production of natural insecticide from neem leaves (Azadirachta indica). Asian Journal of Plant Science and Research 1 (4): 33–38.
Butterworth J.H., Morgan E.D. 1968. Isolation of a substance that suppresses feeding in locusts. Chemical Communications 1: 23–24. DOI: https://doi.org/10.1039/C19680000023
Darabian K., Yarahmadi F. 2017. Field efficacy of azadirachtin, chlorfenapyr, and Bacillus thuringiensis against Spodoptera exigua (Lepidoptera: Noctuidae) on sugar beet crop. Journal of the Entomological Research Society 19 (3): 45–52.
Dhar R., Dawar H., Garg S., Basir S.E., Talwar G.P..1996. Effect of volatiles from neem and other natural products on gonotrophic cycle and oviposition of Anopheles stephensi and An. culicifacies (Diptera: Culicidae). Journal of Medical Entomology 33 (2): 195–201. DOI: https://doi.org/10.1093/jmedent/33.2.195
Dorn A., Rademacher J.M., Sehn E. 1987. Effects of azadirachtin on reproductive organs and fertility in the large milkweed bug, Oncopeltus fasciatus. Proc. 3rd Int. Neem Conf. Nairobi, 1986, Eschborn: GTZ. 13 (3): 273–288. DOI: https://doi.org/10.1016/0022-1910(86)90063-6
Dreistadt S.H. 2004. Pests of Landscape Trees and Shrubs: An Integrated Pest Management Guide. UCANR Publications, CA, USA.
Er A., Taşkıran D., Sak O. 2017. Azadirachtin-induced effects on various life history traits and cellular immune reactions of Galleria mellonella (Lepidoptera: Pyralidae). Archives of Biological Sciences 69 (2): 335–344. DOI: https://doi.org/10.2298/ABS160421108E
Fajt E. 1951. Repin moljac (Phthorimaea ocelatela). Biljna Proizvodnja 4 (1): 136–141.
Feder D., Valle D., Rembold H., Garcia E.S..1988. Azadirachtin induced sterilization in mature females of Rhodniuspro lixus. Zeitschriftfür Naturforschung C 43: 908–913. DOI: https://doi.org/10.1515/znc-1988-11-1218
Finney D.J. 1971. Probit Analysis. 3rd Edition, Cambridge University Press, Cambridge, UK, 333 pp.
Fong D.K.H., Kim S., Chen Z., DeSarbo W.S..2016. A Bayesian multinomial probit model for the analysis of panel choice data. Psychometrika 81 (1): 161–83. DOI: https://doi.org/10.1007/s11336-014-9437-6
Fugate K.K., Campbell L.G. 2009. Postharvest deterioration of sugar beet. p. 92–94. In: “Compendium of Beet Diseases and Pests” (R.M. Harveson, L.E. Hanson, G.L. Hein, eds.). Part III. 2nd edition. St. Paul, MN: The American Phytopathological Society Publication, USA.
Ganji Z., Moharramipour S. 2017. Cold hardiness strategy in field collected larvae of Scrobipalpa ocellatella (Lepidoptera: Gelechiidae). Journal of Entomological Society of Iran 36 (4): 287–296.
Garcia J.F., Grisoto E., Vendramim J.D., Botelho P.S.M. 2006. Bioactivity of neem, Azadirachta indica, against spittlebug Mahanarva fimbriolata (Hemiptera: Cercopidae) on sugarcane. Journal of Economic Entomology 99: 2010–2014. DOI: https://doi.org/10.1093/jee/99.6.2010
Gnanamani R., Dhanasekaran S. 2013. Growth inhibitory effects of azadirachtin against Pericallia ricini (Lepidoptera: Arctiidae). World Journal of Zoology 8 (2): 185–191.
Godinho H.P. 2007. Reproductive strategies of fishes applied to aquaculture: bases for development of production technologies. Revista Brasileira de Reprodução Animal 31 (3): 351–360.
Hasan F., Ansari M.S..2011. Toxic effects of neem-based insecticides on Pieris brassicae (Linn.). Crop Protection 30 (4): 502–507. DOI: https://doi.org/10.1016/j.cropro.2010.11.029
Heibatian A., Yarahmadi F., Lotfi Jalal Abadi A. 2018. Field efficacy of biorational insecticides, azadirachtin and Bt, on Agrotis segetum (Lepidoptera: Noctuidae) and its carabid predators in the sugar beet fields. Journal of Crop Protection 7 (4): 365–373.
Ikeura H., Sakura A., Tamaki M. 2013. Repellent effect of neem against the cabbage armyworm on leaf vegetables. Journal of Agriculture and Sustainability 4 (1): 1–15.
Irigaray F.J., Moreno-Grijalba F., Marco V., Perez-Moreno I. 2010. Acute and reproductive effects of Align®, an insecticide containing azadirachtin, on the grape berry moth, Lobesia botrana. Journal of Insect Science 10: 1–33. DOI: https://doi.org/10.1673/031.010.3301
Ismadji S., Kurniawan A., Ju Y.H., Soetaredjo F.E., Ayucitra A., Ong L.K. 2012. Solubility of Azadirachtin and several triterpenoid compounds extracted from neem seed kernel in supercritical CO2. Fluid Phase Equilibria 336: 9–15. DOI: https://doi.org/10.1016/j.fluid.2012.08.026
Jagannadh V., Nair V. 1992. Azadirachtin-induced effects on larval-pupal transformation of Spodoptera mauritia. Physiological Entomology 17: 56–61. DOI: https://doi.org/10.1111/j.1365-3032.1992.tb00989.x
Kheiri M. 1991. Important Pests of Sugar Beet and Their Control. Ministry of Agriculture, Agricultural Research and Education organization. Kalameh Publication Institute, Tehran. Iran, 126 pp. (in Persian)
Kheiri M., Naiim A., Fazeli M., Djavan-Moghaddam H., Eghtedar E. 1980. Some studies on Scrobipalpa ocellatella Boyd in Iran. Applied Entomology and Phytopathology 48: 1–39. (in Persian)
Liang G.M., Chen W., Liu T.X. 2003. Effects of three neem-based insecticides on diamond back moth (Lepidoptera: Plutellidae). Crop Protection 22: 333–340. DOI: https://doi.org/10.1016/S0261-2194(02)00175-8
Liu T.X., Liu S.S. 2006. Experience‐altered oviposition responses to a neem‐based product, Neemix®, by the diamondback moth, Plutella xylostella. Pest Management Science 62: 38–45. DOI: https://doi.org/10.1002/ps.1123
Lopez O., Fernández-Bolaños J.G., Gil M.V. 2005. New trends in pest control: The search for greener insecticides. Green Chemistry 7 (6): 431–442. DOI: https://doi.org/10.1039/b500733j
Lucantoni L., Giusti F., Cristofaro M., Pasqualini L., Esposito F., Lupetti P. 2006. Effects of a neem extract on blood feeding, oviposition and oocyte ultrastructure in Anopheles stephensi Liston (Diptera: Culicidae). Tissue and Cell 38: 361–371. DOI: https://doi.org/10.1016/j.tice.2006.08.005
Ma D.L., Gordh G., Zalucki M.P. 2000. Biological effects of azadirachtin on Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) fed on cotton and artificial diet. Australian Journal of Entomology 39 (4): 301–304. DOI: https://doi.org/10.1046/j.1440-6055.2000.00180.x
Manna B., Maiti S., Dasa A. 2020. Bioindicator potential of Spathosternum prasiniferum (Orthoptera; Acridoidea) in pesticide (azadirachtin)-induced radical toxicity in gonadal/nymphal tissues; correlation with eco-sustainability. Journal of Asia-Pacific Entomology 23: 350–357. DOI: https://doi.org/10.1016/j.aspen.2020.02.007
Martinez S.S., van Emden H.F. 2001. Growth disruption, abnormalities and mortality of Spodoptera littoralis caused by azadirachtin. Neotropical Entomology 30: 113–125. DOI: http://dx.doi.org/10.1590/S1519-566X2001000100017
Mochiah M.B., Banful B., Fening K.N., Amoabeng B.W., Ekyem S., Braimah H., Owusu-Akyaw M. 2011. Botanicals for the management of insect pests in organic vegetable production. Journal of Entomology and Nematology 3 (6): 85–97.
Mordue A.J. 2004. Present concepts of the mode of action of azadirachtin from Neem. p. 229–242. In: “Neem: Today and in the New Millennium” (O. Koul, S. Wahab, eds.). Chapter 11. Kluwer Academic Publishers. DOI: https://doi.org/10.1007/1-4020-2596-3_11
Mordue A.J., Blackwell A. 1993. Azadirachtin: an update. Journal of Insect Physiology 39: 903–924. DOI: https://doi.org/10.1016/0022-1910(93)90001-8
Mordue A.J., Morgan E.D., Nisbet A.J. 2005. Azadirachtin, a natural product in insect control. p. 185–201. In: “Comprehensive Molecular Insect Science” (L.I. Gilbert, ed.). Elsevier, Amsterdam.
Morgan E.D. 2009. Azadirachtin, a scientific gold mine. Journal of Bioorganic and Medicinal Chemistry 17 (12): 4096–4105. DOI: https://doi.org/10.1016/j.bmc.2008.11.081
Naumann K., Isman M.B. 1995. Evaluation of neem Azadirachtaindica seed extracts and oils as oviposition deterrents to noctuid moths. Entomologia Experimentalis et Applicata 76: 115–120. DOI: https://doi.org/10.1111/j.1570-7458.1995.tb01953.x
Orak S., Zandi-Sohani N., Yarahmadi F. 2019. Some alternatives to the chemical control of Spodoptera exigua (Hubner, 1808) in black-eyed pea. International Journal of Tropical Insect Science 39: 319–323. DOI: https://doi.org/10.1007/s42690-019-00043-4
Osborne J.W. 2010. Improving your data transformations: applying the Box-Cox transformation. Practical Assessment, Research and Evaluation 15: 1–9. DOI: https://doi.org/10.7275/qbpc-gk17
Pineda S. Martinez A.M., Figueroa J.I., Schneider M.I., Estal P.D., Vinuela E., Gomez B., Smagghe G., Budia F. 2009. Influence of azadirachtin and methoxyfenozide on life parameters of Spodoptera littoralis (Lepidoptera: Noctuidae). Journal of Economic Entomology 102: 1490–1496. DOI: https://doi.org/10.1603/029.102.0413
Qiao J., Zou X., Lai D., Yan Y., Wang Q., Li W., Gu H. 2014. Azadirachtin blocks the calcium channel and modulates the cholinergic miniature synaptic current in the central nervous system of Drosophila. Pest Management Science 70: 1041–1047. DOI: https://doi.org/10.1002/ps.3644
Qin D., Zhang P., Zhou Y., Liu B., X Jao C., Chen W., Zhang Zh. 2019. Antifeeding effects of azadirachtin on the fifth instar Spodoptera litura larvae and the analysis of azadirachtin on target sensilla around mouthparts. Archives of Insect Biochemistry and Physiology 103 (4): 1–12. DOI: https://doi.org/10.1002/arch.21646
Radhika S., Sahayaraj K., Senthil‐Nathan S., Hunter W.B. 2018. Individual and synergist activities of monocrotophos with neem based pesticide, Vijayneem against Spodoptera litura Fab. Physiological and Molecular Plant Pathology 101: 54–68. DOI: https://doi.org/10.1016/j.pmpp.2017.05.004
Raman G.V., Rao M.S., Srimannaryana G. 2000. Efficacy of botanical formulations from Annona squamosa Linn. and Azadirachta indica A. Juss against semilooper Achaea janata Linn. infesting castor in the field. Journal of Entomological Research. 24(3): 235–238.
Rashidov M.A., Khasanov A. 2003. Pests of sugar beet in Uzbekistan. Zashchita Rastenii 3: 29.
Razini A., Pakyari H., Arbab A. 2017. Estimation of sugar beet lines and cultivars infection to Scrobipalpa ocellatellaboyd. (Lepidoptera: Gelechiidae) larvae under field condition with natural infection. Journal of Sugar Beet 32 (2): 147–155.
Razini A., Pakyari H., Arbab A., Ardeh M.J., Ardestani H. 2016. Study of infestation amount to beet moth “Scrobipalpa ocellatella”, among different sugar beet genotypes in the field. Proceedings of 22nd Iranian Plant Protection Congress, 23-27 August, Karaj, Iran.
Sami A.J., Bilal S., Khalid M.,. Shakoori F.R, Rehman F., Shakoori A.R. 2016. Effect of crude neem (Azadirachta indica) powder and azadirachtin on the growth and Acetylcholinesterase activity of Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae). Pakistan Journal of Zoology 48 (3): 881–886.
Schluter U., Bidmon H.J., Grewe S. 1985. Azadirachtin affects growth and endocrine events in larvae of the tobacco hornworm Manduca sexta. Journal of Insect Physiology 31: 773–777. DOI: https://doi.org/10.1016/0022-1910(85)90070-8
Schmutterer H. 1990. Properties and potential of natural pesticides from the neem tree, Azadirachta indica. Annual Review of Entomology 35: 271–297. DOI: https://doi.org/10.1146/annurev.en.35.010190.001415
Schreck C.E. 1977. Techniques for evaluation of insect repellents: a critical review. Annual Review of Entomology 22: 101–119. DOI: https://doi.org/10.1146/annurev.en.22.010177.000533
Seljasen R., Meadow R. 2006. Effects of neem on oviposition and egg and larval development of Mamestra brassicae L: dose response, residual activity, repellent effect and systemic activity in cabbage plants. Crop Protection 25: 338–345. DOI: https://doi.org/10.1016/j.cropro.2005.05.007
Senthil-Nathan S. 2013. Physiological and biochemical effect of neem and other Meliaceae plants secondary metabolites against Lepidopteran insects. Front Physiology 4: 359. DOI: https://doi.org/10.3389/fphys.2013.00359
Shannag H., Capinera J., Freihat N.M. 2015. Effects of neem-based insecticides on consumption and utilization of food in larvae of Spodoptera eridania (Lepidoptera: Noctuidae). Journal of Insect Science 15 (1): 152. DOI: https://doi.org/10.1093/jisesa/iev134
Sharma A., Shahzad B., Kumar V., Kohli S.K., Sidhu G.P.S., Bali A.S., Handa N., Kapoor D., Bhardwaj R., Zheng B. 2019. Phytohormones regulate accumulation of osmolytes under abiotic stress. Biomolecules 9 (7): 1–36. DOI: https://doi.org/10.3390/biom9070285
Shimizu T. 1988. Suppressive effects of azadirachtin on spermiogenesis of the diapausing cabbage armyworm, Mamestra brassicae, in vitro. Entomologia Experimentalis et Applicata 46: 197–199.
Sieber K.P., Rembold H. 1983. The effects of azadirachtin on the endocrine control of moulting in Locusta migratoria. Journal of Insect Physiology 29: 523–527. DOI: https://doi.org/10.1016/0022-1910(83)90083-5
Smith S.L., Mitchell M.J..1988. Effects of azadirachtin on insect cytochrome P-450 dependant ecdysone 20-mono oxygenase activity. Biochemical and Biophysical Research Communications 154: 559–563. DOI: https://doi.org/10.1016/0006-291x(88)90176-3
Shu B., Zhang J., Cui G., Sun R., Yi X., Zhong G. 2018. Azadirachtin affects the growth of Spodoptera litura Fabricius by inducing apoptosis in larval midgut. Frontiers in Physiology 9: 1–12. DOI: https://doi.org/10.3389/fphys.2018.00137
Tanzubil P.B. 1995. Effects of neem Azadirachta indica (A. Juss) extracts on food intake and utilization in the African armyworm, Spodoptera exempta (Walker). Insect Science and its Application 16: 167–170. DOI: https://doi.org/10.1017/S1742758400017069
Tanzubil P.B., McCaffery A.R..1990. Effects of azadirachtin and aqueous neem seed extracts on survival, growth and development of the African armyworm, Spodoptera exempta. Crop Protection 9: 383–386. DOI: https://doi.org/10.1016/0261-2194(90)90012-V
Tome H.V.V., Martins J.C., Corrêa A.S., Galdino T.V.S., Picanço M.C., Guedes R.N.C. 2013. Azadirachtin avoidance by larvae and adult females of the tomato leaf miner Tuta absoluta. Crop Protection 46: 63–69. DOI: https://doi.org/10.1016/j.cropro.2012.12.021
Ünsal S., Güner E. 2016. The effects of biopesticide Azadirachtin on the Fifth Instar Galleria mellonella L. (Lepidoptera: Pyralidae) Larval Integument. International Journal of Crop Science and Technology. 2(2): 60-68.
Vilca Malqui K.S., Vieira J.L., Guedes R.N.C., Gontijo L.M. 2014. Azadirachtin-induced hormesis mediating shift in fecundity longevity trade-off in the Mexican bean weevil (Chrysomelidae: Bruchinae). Journal of Economic Entomology 107: 860–866. DOI: https://doi.org/10.1603/ec13526
Wallace E.L. 2017. Investigating Life History Stages and Methods to Interrupt the Life Cycle, and Suppress Offspring Production, in the Queensland Fruit Fly (Bactroceratryoni). Thesis (PhD Doctorate). Griffith School of Environment. Gold Coast, Queensland, Australia, 118 pp. DOI: https://doi.org/10.25904/1912/1946
Wilps H. 1989. The influence of neem seed kernel extracts (NSKE) from the neem tree Azadirachta indicaon flight activity, food ingestion, reproductive rate and carbohydrate metabolism in the Diptera Phormia terraenovae (Diptera, Muscidae). Zoologische Jahrbucher Physiology 93: 271–282.
Zada H., Naheed H., Ahmad B., Saljoqi A.Ur R., Salim M., Hassan E. 2018. Toxicity potential of different azadirachtin against Plutella Xylostella (Lepidoptera; Plutellidae) and its natural enemy, Diadegma species. Journal of Agronomy and Agricultural Science 1: 003. DOI: https://doi.org/10.24966/AAS-8292/100003
Zhong B., Chaojun L., Weiquan Q. 2017. Effectiveness of the botanical insecticide azadirachtin against Tirathaba rufivena (Lepidoptera: Pyralidae). Florida Entomological Society 100 (2): 215–218. DOI: https://doi.org/10.1653/024.100.0215

Go to article

Authors and Affiliations

Somaye Allahvaisi

1

Mahdi Hassani

2

Bahram Heidari

3

Plant Protection Research Department, Hamedan Agriculture and Natural Resources Research and Education Center, AREEO, Hamedan, Iran
Sugar Beet Research Department, Hamedan Agriculture and Natural Resources Research and Education Center, AREEO, Hamedan, Iran
Department of Plant Production and Genetics, School of Agriculture, Shiraz University, Shiraz, Iran

Growth optimization of Klebsiella pneumoniae in magnetically assisted bioreactor

Maciej Konopacki Adrian Augustyniak Bartłomiej Grygorcewicz Barbara Dołęgowska Marian Kordas Rafał Rakoczy

Chemical and Process Engineering | 2022 | vol. 43 | No 3 | 289-304 | DOI: 10.24425/cpe.2022.140833

Keywords bacteria cultivation growth kinetics optimization process magnetically assisted bioreactor

Download PDF Download RIS Download Bibtex

Abstract

In recent years, infections are more often caused by pathogens with high multi-drug resistance, classified as the “ESKAPE” microorganisms. Therefore, investigation of these pathogens, e.g., Klebsiella pneumoniae, often requires biomass production for treatment testing such as antibiotics or bacteriophages. Moreover, K. pneumoniae can be successfully applied as a biocatalyst for other industrial applications, increasing the need for this bacteria biomass. In the current study, we proposed a novel magnetically assisted bioreactor for the cultivation of K. pneumoniae cells in the presence of an external alternating magnetic field (AMF). High efficiency of the production requires optimal bacteria growth conditions, e.g., temperature and field frequency. Therefore, we performed an optimization procedure using a central composite design for these two parameters in a wide range. As an objective function, we utilized a novel, previously described growth factor that considers both biomass and bacteria growth kinetics. Thus, based on the response surface, we could specify the optimal growth conditions. Moreover, we analysed the impact of the AMF on bacteria proliferation, which indicated positive field frequency windows, where the highest stimulatory effect of AMF on bacteria proliferation occurred. Obtained results proved that the magnetically assisted bioreactor could be successfully employed for K. pneumoniae cultivation.

Go to article

Authors and Affiliations

Maciej Konopacki

1 2

e-mail:

ORCID:

Adrian Augustyniak

1 3

e-mail:

ORCID:

Bartłomiej Grygorcewicz

1 2

e-mail:

ORCID:

Barbara Dołęgowska

2

e-mail:

ORCID:

Marian Kordas

1

e-mail:

ORCID:

Rafał Rakoczy

1

e-mail:

ORCID:

West Pomeranian University of Technology in Szczecin, Faculty of Chemical Technology and Engineering, Department of Chemical and Process Engineering, al. Piastów 42, 71-065 Szczecin, Poland
Pomeranian Medical University in Szczecin, Chair of Microbiology, Immunology and Laboratory Medicine, Department of Laboratory Medicine, al. Powstanców Wielkopolskich 72, 70-111 Szczecin, Poland
Technische Universität Berlin, Building Materials and Construction Chemistry, Gustav-Meyer Allee 25,13355 Berlin, Germany

The Design of Ti-5Al-5Mo-5V-3Cr Elemental Powders Mixture Processing

K. Zyguła M. Wojtaszek

Archives of Metallurgy and Materials | 2020 | vol. 65 | No 1 | 283-289 | DOI: 10.24425/amm.2020.131728

Keywords titanium alloy powder metallurgy microstructure mechanical properties compaction

Download PDF Download RIS Download Bibtex

Abstract

The aim of the study was to indicate the influence of consolidation processes on microstructure and selected mechanical properties of powder metallurgy Ti-5Al-5Mo-5V-3Cr alloy, which was produced by blending of elemental powders method. Morphology of the mixture and its ingredients were examined using scanning electron microscopy. The consolidation of powders mixture was conducted using two approaches. The first consisted of the uniaxial hot pressing process, the second included two steps – uniaxial cold pressing process and sintering under argon protective atmosphere. Microstructural analysis was performed for both as-pressed compacts using light microscopy. Additionally, computed tomography studies were carried out, in order to examine the internal structure of compacts. Chosen mechanical properties, such as Vickers hardness and compression strength was also determined and compared. The conducted research proves that the proposed production method leads to obtain materials with no structural defects and relatively low porosity. Moreover, due to the proper selection of manufacturing parameters, favorable microstructures can be received, as well as mechanical properties, which are comparable to conventionally produced material with the corresponding chemical composition.

Go to article

Authors and Affiliations

K. Zyguła

e-mail:

ORCID:

M. Wojtaszek

e-mail:

ORCID:

Influence of Initial Charge Temperature and Furnace Exploitation on Steel Loss

J. Boryca T. Wyleciał D. Urbaniak

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 1 | 289-291 | DOI: 10.24425/amm.2022.137504

Keywords heating of steel charge loss of steel initial charge temperature furnace exploitation

Download PDF Download RIS Download Bibtex

Abstract

Steel loss related to the formation of scale is a parameter that is of great importance in the charge heating process. The value of steel loss determined by the thickness of the scale layer affects the intensity of the heat transfer process in the heating furnace, but also constitutes a significant element in the heat-material balance. Reducing the loss of steel during charge heating has a positive effect on heat consumption and material losses, which is extremely important in the context of energy and resource savings, the main elements of sustainable development processes. The methodology of determining the loss of steel to scale in an industrial heating furnace is presented in the paper. The results of calculations for various charge temperatures at the entrance to the furnace are presented. The influence of furnace operating conditions on steel loss is discussed.

Go to article

Authors and Affiliations

J. Boryca

1

e-mail:

ORCID:

T. Wyleciał

1

e-mail:

ORCID:

D. Urbaniak

1

e-mail:

ORCID:

Czestochowa University of Technology, 19 Armii Krajowej Av., 42-200 Czestochowa, Poland

An Enhanced IEEE1588 Clock Synchronization for Link Delays Based on a System-on-Chip Platform

Xiaohan Wei Xingzhong Wei Zhongqiang Luo Jianwu Wang Kaixing Cheng

International Journal of Electronics and Telecommunications | 2021 | vol. 67 | No 2 | 289-294 | DOI: 10.24425/ijet.2021.135978

Keywords IEEE1588 clock synchronization fronthaul TSN System-on-chip

Download PDF Download RIS Download Bibtex

Abstract

The clock synchronization is considered as a key technology in the time-sensitive networking (TSN) of 5G fronthaul. This paper proposes a clock synchronization enhancement method to optimize the link delays, in order to improve synchronization accuracy. First, all the synchronization dates are filtered twice to get the good calculation results in the processor, and then FPGA adjust the timer on the slave side to complete clock synchronization. This method is implemented by Xilinx Zynq UltraScale+ MPSoC (multiprocessor system-on-chip), using FPGA+ARM software and hardware co-design platform. The master and slave output Pulse Per-Second signals (PPS). The synchronization accuracy was evaluated by measuring the time offset between PPS signals. Contraposing the TSN, this paper compares the performance of the proposed scheme with some previous methods to show the efficacy of the proposed work. The results show that the slave clock of proposed method is synchronized with the master clock, leading to better robustness and significant improvement in accuracy, with time offset within the range of 40 nanoseconds. This method can be applied to the time synchronization of the 5G open fronthaul network and meets some special service needs in 5G communication.

Go to article

Bibliography

1] M. Dong, Z. Qiu, W. Pan, C. Chen, J. Zhang and D. Zhang, "The Design and Implementation of IEEE 1588v2 Clock Synchronization System by Generating Hardware Timestamps in MAC Layer," 2018 International Conference on Computer, Information and Telecommunication Systems (CITS), Colmar, 2018, pp. 1-5.
[2] Chavan A., Nagurvalli S., Jain M., Chaudhari S. (2018) Implementation of FPGA-Based Network Synchronization Using IEEE 1588 Precision Time Protocol (PTP). In: Sa P., Bakshi S., Hatzilygeroudis I., Sahoo M. (eds) Recent Findings in Intelligent Computing Techniques. Advances in Intelligent Systems and Computing, vol 708. Springer, Singapore.
[3] R. Exel, T. Bigler and T. Sauter, "Asymmetry Mitigation in IEEE 802.3 Ethernet for High-Accuracy Clock Syn chronization," in IEEE Transactions on Instrumentation and Measurement, vol. 63, no. 3, pp. 729- 736, March 2014.
[4] W. Tseng, S. Siu, S. Lin and C. Liao, "Precise UTC dissemination through future telecom synchronization networks," 2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum, Denver, CO, 2015, pp. 696-699.
[5] O. Ronen and M. Lipinski, "Enhanced synchronization accuracy in IEEE1588," 2015 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS), Beijing, 2015, pp. 76-81.
[6] IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Sys tems," in IEEE Std 1588-2008 (Revision of IEEE Std 1588-2002) , vol., no., pp.1-300, 24 July 2008.
[7] Eleftherios Kyriakakis, Jens Sparsø, and Martin Schoeberl. 2018. Hardware Assisted Clock Synchronization with the IEEE 1588-2008 Precision Time Protocol. In Proceedings of the 26th International Conference on Real-Time Networks and Systems (RTNS ’18). Association for Computing Machinery, New York, NY, USA, 51–60.
[8] W.Jinqi, C.Hong, "Implementation of IEEE1588 Precision Clock Synchronization Protocol Based on ARM",2019,42(06):1527-1531.
[9] G. Giorgi and C. Narduzzi, "Performance Analysis of Kalman-Filter- Based Clock Synchronization in IEEE 1588 Networks," in IEEE Transactions on Instrumentation and Measurement, vol. 60, no. 8, pp. 2902-2909, Aug. 2011.
[10] Lee S. An enhanced IEEE 1588 time synchronization algorithm for asymmetric communication link using block burst transmission[J]. IEEE communications letters, 2008, 12(9): 687-689.
[11] Chen, W., Sun, J., Zhang, L. et al. An implementation of IEEE 1588 protocol for IEEE 802.11 WLAN. Wireless Netw 21, 2069–2085 (2015).
[12] P. A. Crossley, H. Guo and Z. Ma, "Time synchronization for transmission substations using GPS and IEEE 1588," in CSEE Journal of Power and Energy Systems, vol. 2, no. 3, pp. 91-99, Sept. 2016.
[13] H. Guo and P. Crossley, "Design of a Time Synchronization System Based on GPS and IEEE 1588 for Transmission Substa tions," in IEEE Transactions on Power Delivery, vol. 32, no. 4, pp. 2091-2100, Aug. 2017.
[14] O. Seijo, I. Val, J. A. Lopez-Fernandez and M. Velez, "IEEE 1588 Clock Synchronization Performance over Time-Varying Wireless Channels," 2018 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS), Geneva, 2018, pp. 1-6.
[15] S. Lee and C. Hong, "An Accuracy Enhanced IEEE 1588 Synchronization Protocol for Dynamically Changing and Asymmetric Wireless Links," IEEE Communications Letters, vol. 16, no. 2, pp. 190-192, February 2012.
[16] The Linux PTP Project. [Online]. Available: http://linuxptp.sourceforge.net/, accessed Dec. 2015.
[17] N. Moreira, J. Lázaro, U. Bidarte, J. Jimenez, and A.Astarloa, "On the Utilization of System-on-Chip Platformsto Achieve Nanosecond Synchronization Accuracies in Substation Automation Systems."

Go to article

Authors and Affiliations

Xiaohan Wei

1

Xingzhong Wei

1

Zhongqiang Luo

1

Jianwu Wang

1

Kaixing Cheng

1

School of Automation and Information Engineering and Artificial Intelligence Key Laboratory of Sichuan Province, Sichuan University of Science and Engineering, Yibin, China

Quasi-distributed network of low-coherence fiber-optic Fabry–Pérot sensors with cavity length-based addressing

Katarzyna Karpienko Marcin J. Marzejon Adam Mazikowski Jerzy Plucinski

Metrology and Measurement Systems | 2021 | vol. 28 | No 2 | 289-305 | DOI: 10.24425/mms.2021.136608

Keywords Fabry–Pérot interferometer sensors network fiber-optics sensor interferometry

Download PDF Download RIS Download Bibtex

Abstract

Distributed measurement often relies on sensor networks. In this paper, we present the construction of low-coherence fiber-optic Fabry–Pérot sensors connected into a quasi-distributed network. We discuss the mechanism of spectrum modulation in this type of sensor and the constraints of assembly of such sensors in the network. Particular attention was paid to separate the signals from individual sensors which can be achieved by cavity length-based addressing. We designed and built a laboratory model of a temperature sensors network. The employed sensors are low-coherence Fabry–Pérot interferometric sensors in a fiberoptics configuration. The extrinsic sensor cavity utilizes the thermal expansion of ceramics, and the sensors are addressed by the different lengths of the cavities. The obtained test results showthat the signal components from each sensor can be successfully separated, and the number of sensors could be expanded depending on the FWHM of the light source.

Go to article

Authors and Affiliations

Katarzyna Karpienko

1

Marcin J. Marzejon

1

Adam Mazikowski

1

Jerzy Plucinski

1

Gdansk University of Technology, Faculty of Electronics, Telecommunications and Informatics, Department of Metrology and Optoelectronics, 11/12 Gabriela Narutowicza St., 80-233 Gdansk, Poland

Design and numerical analysis of a highly sensitive ultrasonic acoustic sensor based on -phase-shifted fiber Bragg grating and fiber Mach–Zehnder interferometer interrogation

Krishna Mohan Dwivedi Gaurav Trivedi Sunil K. Khijwania Tomasz Osuch

Metrology and Measurement Systems | 2020 | vol. 27 | No 2 | 289-300 | DOI: 10.24425/mms.2020.132775

Keywords π-FBG unbalanced F-MZI strain sensitivity ultrasonic acoustic sensor

Download PDF Download RIS Download Bibtex

Abstract

A π-phase-shifted fiber Bragg grating (π-FBG) shows high sensitivity to the ultrasonic (US) wave as compared to the conventional FBG due to the strong slow-light phenomenon at the resonance peak. However, its sensitivity is limited by the interrogation schemes. A combination of π-FBG and unbalanced fiber Mach– Zehnder interferometer (F-MZI) are theoretically analyzed and optimized for the highly sensitive acoustic sensor. The coupled-mode theory (CMT) and transfer matrix method (TMM) are used to establish the numerical modelling of π-FBG. For the optimized grating parameters of π-FBG, the proposed sensing system shows the high strain sensitivity of 1.2 × 108/ε, the highest dynamic strain resolution of 4.1fε/√Hz, and the highest wavelength shift resolution of 4.9 × 10−9 pm. Further, the proposed sensing system strongly supports both time andwavelength division multiplexing techniques. Therefore, the proposed sensing system shows extreme importance in single as well as quasi-distributed US acoustic wave sensing networks.

Go to article

Authors and Affiliations

Krishna Mohan Dwivedi

Gaurav Trivedi

Sunil K. Khijwania

Tomasz Osuch

Solution blow spun poly-L-lactic acid/ceramic fibrous composites for bone implant applications

Michał Wojasiński Tomasz Ciach

Chemical and Process Engineering | 2021 | vol. 42 | No 3 | 275-289 | DOI: 10.24425/cpe.2021.138931

Keywords solution blowspinning composite fibres submicron fibres nanofibres poly-L-lactic acid ceramic particles bone implants

Download PDF Download RIS Download Bibtex

Abstract

Every bone implant to work correctly after implantation needs to integrate with the surrounding bone. To enhance such a process, called osseointegration, various techniques of implant surface modification emerged. One of the approaches is based on the deposition of nano- and submicron materials on the implant surface. This paper presents a solution blow spinning process for producing poly-L-lactic acid (PLLA)/ceramic fibrous composites designed to be deposited directly onto orthopaedic implants prior to implantation to increase osseointegration. We produced plain PLLA fibrous materials for comparison, and fibrous composite materials with ��-tricalcium phosphate (��TCP), hydroxyapatite nanoparticles (nHAp) and hydroxyapatite nanoparticles modified with lecithin (nHAp-LE). We performed the structural analysis of produced materials with scanning electron microscopy, gravimetric determination of porosity, and water contact angle measurement. We also used infrared spectroscopy, Alizarin Red S staining, and cytotoxicity evaluation to conclude that PLLA/nHAp-LE composite material shows the most promising properties to be applied as surface modification of bone implants. To visualise fibrous composite deposition on implants, we used two models: titanium plate and stainlesssteel bolt. Thus, we showed that the solution blow spun materials can be used for surface modification of orthopaedic implants.

Go to article

Bibliography

Abdal-hay A., Hamdy A.S., Khalil K.A., Lim J.H., 2015. A novel simple one-step air jet spinning approach for deposition of poly(vinyl acetate)/hydroxyapatite composite nanofibers on Ti implants. Mater. Sci. Eng., C, 49, 681–690. DOI: 10.1016/j.msec.2015.01.008.
Abdal-hay A., Hasan A., Yu-Kyoung, Lee M.-H., Hamdy A. S., Khalil K.A., 2016. Biocorrosion behavior of biodegradable nanocomposite fibers coated layer-by-layer on AM50 magnesium implant. Mater. Sci. Eng., C, 58, 1232–1241. DOI: 10.1016/j.msec.2015.09.065.
Abdal-hay A., Sheikh F.A., Lim J.K., 2013. Air jet spinning of hydroxyapatite/poly(lactic acid) hybrid nanocomposite membrane mats for bone tissue engineering. Colloids Surf., B, 102, 635–643. DOI: 10.1016/j.colsurfb.2012.09.017.
Balakrishnan H., Hassan A., Imran M., Wahit M.U., 2012. Toughening of polylactic acid nanocomposites: A short review. Polymer-Plastics Technol. Eng., 51, 175–192. DOI: 10.1080/03602559.2011.618329.
Behrens A.M., Casey B.J., Sikorski M.J., Wu K.L., Tutak W., Sandler A.D., Kofinas P., 2014. In situ deposition of PLGA nanofibers via solution blow spinning. ACS Macro Lett., 3, 249–254. DOI: 10.1021/mz500049x.
Bonan R.F., Mota M.F., da Costa Farias R.M., Silva S.D., Bonan P.R.F., Diesel L., Menezes R.R., da Cruz Perez D.E., 2019. In vitro antimicrobial and anticancer properties of TiO2 blow-spun nanofibers containing silver nanoparticles. Mater. Sci. Eng., C, 104, 109876. DOI: 10.1016/j.msec.2019.109876.
Carlsson L., Röstlund T., Albrektsson B., Albrektsson T., Brånemark P.-I., 1986. Osseointegration of titanium implants. Acta Orthop. Scand., 57, 285–289. DOI: 10.3109/17453678608994393.
Civantos A., Martínez-Campos E., Ramos V., Elvira C., Gallardo A., Abarrategi A., 2017. Titanium coatings and surface modifications: Toward clinically useful bioactive implants. ACS Biomater. Sci. Eng., 3, 1245–1261. DOI: 10.1021/acsbiomaterials.6b00604.
Costa R.G.F., Brichi G.S., Ribeiro C., Mattoso L.H.C., 2016. Nanocomposite fibers of poly(lactic acid)/titanium dioxide prepared by solution blow spinning. Polym. Bull., 73, 2973–2985. DOI: 10.1007/s00289-016-1635-1.
Daristotle J.L., Behrens A.M., Sandler A.D. Kofinas P., 2016. A review of the fundamental principles and applications of solution blow spinning. ACS Appl. Mater. Interfaces, 8, 34951–34963. DOI: 10.1021/acsami.6b12994.
Deneff J.I.,Walton K.S., 2019. Production of metal-organic framework-bearing polystyrene fibers by solution blow spinning. Chem. Eng. Sci., 203, 220–227. DOI: 10.1016/j.ces.2019.03.012.
Ferreira T.P.M., Nepomuceno N.C., Medeiros E.L.G., Medeiros E.S., Sampaio F.C., Oliveira J.E., Oliveira M.P., Galvão L.S., Bulhões E.O., Santos A.S.F., 2019. Antimicrobial coatings based on poly(dimethyl siloxane) and silver nanoparticles by solution blow spraying. Prog. Org. Coat., 133, 19–26. DOI: 10.1016/j.porgcoat.2019.04.032.
François S., Chakfé N., Durand B., Laroche G., 2009. A poly(l-lactic acid) nanofibre mesh scaffold for endothelial cells on vascular prostheses. Acta Biomater., 5, 2418–2428. DOI: 10.1016/j.actbio.2009.03.013.
Gregory C.A., Gunn W.G., Peister A., Prockop D.J., 2004. An Alizarin red-based assay of mineralisation by adherent cells in culture: comparison with cetylpyridinium chloride extraction. Anal. Biochem., 329, 77–84. DOI: 10.1016/j.ab.2004.02.002.
Huang Y., Song J., Yang C., Long Y., Wu H., 2019. Scalable manufacturing and applications of nanofibers. Mater. Today, 28, 98–113. DOI: 10.1016/j.mattod.2019.04.018.
Jang J.-H., Castano O., Kim H.-W., 2009. Electrospun materials as potential platforms for bone tissue engineering. Adv. Drug Delivery Rev., 61, 1065–1083. DOI: 10.1016/j.addr.2009.07.008.
Kopec K.,Wojasinski M., Ciach T., 2020. Superhydrophilic polyurethane/polydopamine nanofibrous materials enhancing cell adhesion for application in tissue engineering. Int. J. Mol. Sci., 21, 6798. DOI: 10.3390/ijms21186798.
Latocha J., Wojasinski M., Jurczak K., Gierlotka S., Sobieszuk P., Ciach T., 2018. Precipitation of hydroxyapatite nanoparticles in 3D-printed reactors. Chem. Eng. Process. Process Intensif., 133, 221–233. DOI: 10.1016/j.cep.2018.10.001.
Lewis R.J., Sr (Ed.), 1997. Hawley’s Condensed chemical dictionary. 13th edition. John Wiley & Sons, Inc., New York, NY, p. 88. Li J.P., Habibovic P., van den Doel M., Wilson C.E., de Wijn J.R., van Blitterswijk C.A., de Groot K., 2007. Bone ingrowth in porous titanium implants produced by 3D fiber deposition. Biomaterials, 28, 2810–2820. DOI: 10.1016/j.biomaterials.2007.02.020.
McEvoy G.K. (Ed.), 1992. American hospital formulary service – Drug information 92. American Society of Hospital Pharmacists, Inc., Bethesda, MD (Plus Supplements 1992), 276.
Medeiros E.L.G., Gomes D.S., Santos A.M.C., Vieira R.H., de Lima I.L., Rocha F.S., de S. Castro-Filice L., Medeiros E.S., Neves G.A., Menezes R.R., 2021. 3D nanofibrous bioactive glass scaffolds produced by one-step spinning process. Ceram. Int., 47, 102–110. DOI: 10.1016/j.ceramint.2020.08.112.
Medeiros E.S., Glenn G.M., Klamczynski A.P., Orts W.J., Mattoso L.H.C., 2009. Solution blow spinning: A new method to produce micro- and nanofibers from polymer solutions. J. Appl. Polym. Sci. 113, 2322–2330. DOI: 10.1002/app.30275.
Ravichandran R., Ng C.C., Liao S., Pliszka D., Raghunath M., Ramakrishna S., Chan C.K., 2012. Biomimetic surface modification of titanium surfaces for early cell capture by advanced electrospinning. Biomed. Mater., 7, 015001. DOI: 10.1088/1748-6041/7/1/015001.
Reneker D.H., Yarin A.L., 2008. Electrospinning jets and polymer nanofibers. Polymer, 49, 2387–2425. DOI: 10.1016/j.polymer.2008.02.002.
Roseti L., Parisi V., Petretta M., Cavallo C., Desando G., Bartolotti I., Grigolo B., 2017. Scaffolds for bone tissue engineering: State of the art and new perspectives. Mater. Sci. Eng., C, 78, 1246–1262. DOI: 10.1016/j.msec.2017.05.017.
Schindelin J., Arganda-Carreras I., Frise E., Kaynig V., Longair M., Pietzsch T., Preibisch S., Rueden C., Saalfeld S., Schmid B., Tinevez J.-Y., White D.J., Hartenstein V., Eliceiri K., Tomancak P., Cardona A., 2012. Fiji: an opensource platform for biological-image analysis. Nat. Methods, 9, 676–682. DOI: 10.1038/nmeth.2019.
Sharma B., Elisseeff J.H., 2004. Engineering structurally organised cartilage and bone tissues. Ann. Biomed. Eng., 32, 148–159. DOI: 10.1023/b:abme.0000007799.60142.78.
Tammaro L., Vittoria V., Wyrwa R., Weisser J., Beer B., Thein S., Schnabelrauch M., 2014. Fabrication and characterisation of electrospun polylactide/��-tricalcium phosphate hybrid meshes for potential applications in hard tissue repair. BioNanoMaterials, 15, 9–20. DOI: 10.1515/bnm-2014-0001.
Tomecka E., Wojasinski M., Jastrzebska E., Chudy M., Ciach T., Brzozka Z., 2017. Poly(L-lactic acid) and polyurethane nanofibers fabricated by solution blow spinning as potential substrates for cardiac cell culture. Mater. Sci. Eng., C, 75, 305–316. DOI: 10.1016/j.msec.2017.02.055.
Tutak W., Sarkar S., Lin-Gibson S., Farooque T.M., Jyotsnendu G., Wang D., Kohn J., Bolikal D., Simon C.G., 2013. The support of bone marrow stromal cell differentiation by airbrushed nanofiber scaffolds. Biomaterials, 34, 2389–2398. DOI: 10.1016/j.biomaterials.2012.12.020.
Wojasinski M., Pilarek M., Ciach T., 2014. Comparative studies of electrospinning and solution blow spinning processes for the production of nanofibrous poly(L-lactic acid) materials for biomedical engineering. Pol. J. Chem. Technol., 16, 43–50. DOI: 10.2478/pjct-2014-0028.
Zhang L., Kopperstad P.,West M., Hedin N., Fong H., 2009. Generation of polymer ultrafine fibers through solution (air-) blowing. J. Appl. Polym. Sci., 114, 3479–3486. DOI: 10.1002/app.30938.

Go to article

Authors and Affiliations

Michał Wojasiński

1

Tomasz Ciach

1 2

e-mail:

ORCID:

Warsaw University of Technology, Faculty of Chemical and Process Engineering, Warynskiego 1, 00-645 Warsaw, Poland
Warsaw University of Technology, Centre for Advanced Materials and Technologies CEZAMAT, Poleczki 19, 02-822 Warsaw, Poland

Development and performance test of a novel solar tracking sensor

Jianjun Lan

Metrology and Measurement Systems | 2023 | vol. 30 | No 2 | 289-303 | DOI: 10.24425/mms.2023.144870

Keywords image recognition photovoltaic power generation photoelectric tracking Hough transform

Download PDF Download RIS Download Bibtex

Abstract

A new solar tracking sensor based on image recognition is proposed and designed to solve the problem of low accuracy of photoelectric tracking in photovoltaic power generation. The sensor can directly output its angular deviation from the sun, and its mechanical structure and working principle are analysed in detail. We use a high-precision camera to collect the image of the two slots on the projector surface and use the Hough transform to identify the image of the light seam. After obtaining the linear equation for the two slots, the coordinate of the intersection point is found, and the calculation of the solar altitude and azimuth can be realized. We have improved the Hough transform scheme by using the skeleton image of the slots instead of the edge image. The improvement of the scheme has been proved to effectively improve the detection accuracy. A calibration test board is used to test the sensor and experimental results show that the scheme can achieve the measurement of azimuth and altitude with the accuracy of be 0.05°, which can meet the detection accuracy requirements of the solar tracking in photovoltaic power generation and many other photoelectric tracking implementations.

Go to article

Authors and Affiliations

Jianjun Lan

1

Fujian Vocational & Technical College of Water Conservancy & Electric Power, School of Electric Power Engineering, Yongan 366000, China

Performance evaluation of unreliable system with infinite number of servers

O. Tikhonenko M. Ziółkowski

Bulletin of the Polish Academy of Sciences Technical Sciences | 2020 | 68 | No. 2 (i.a. Special Section on Computational Intelligence in Communications) | 289-297 | DOI: 10.24425/bpasts.2020.133107

Keywords queueing system with non–homogeneous customers unreliable queueing system total volume loss probability Laplace–Stieltjes transform

Download PDF Download RIS Download Bibtex

Abstract

In the paper, we investigate queueing system M/G/∞ with non–homogeneous customers. As non–homogenity, we mean that each customer is characterized by some arbitrarily distributed random volume. The arriving customers appear according to a stationary Poisson process. Service time of a customer is proportional to his volume. The system is unreliable what means that all its servers can break simultaneously and then the repair period goes on for random time having an arbitrary distribution. During this period, customers present in the system and arriving to it are not served. Their service continues immediately after repair period termination. Time intervals of the system in good repair mode have an exponential distribution. For such system, we determine steady–state sojourn time and total volume of customers present in it distributions. We also estimate the loss probability for the similar system with limited total volume. An analysis of some special cases and some numerical examples are attached as well.

Go to article

Authors and Affiliations

O. Tikhonenko

M. Ziółkowski

Evolution of Professor Leszek Lindner’s ideas on the Quaternary stratigraphy of Poland

Jan Dzierżek Bogusz Kulus

Acta Geologica Polonica | 2023 | vol. 73 | No 3 | 289-306 | DOI: 10.24425/agp.2023.145618

Keywords East-Central Europe Pleistocene Glaciations and interglacials climatostratigraphy Quaternary deposits

Download PDF Download RIS Download Bibtex

Abstract

This contribution characterises the stratigraphic schemes of the Quaternary as constructed and published by Leszek Lindner in 1967–2019. The oldest schemes assume the subdivision of the Pleistocene into three glaciations (i.e., Cracow, Middle-Polish and Baltic) separated by two interglacials (Great and Eemian). The scheme published in 1992 comprises eight glacial and seven interglacial units. The most recent scheme for the Quaternary contains seven advances of the Scandinavian ice-sheet on the area of Poland during the Nidanian (MIS 22), Sanian 1 (MIS 16), Sanian 2 (MIS 12), Liviecian (MIS 10), Krznanian (MIS 8), Odranian (MIS 6), and Vistulian (MIS 2–5d) glaciations. They are separated by six interglacials: Podlasian, Ferdynandovian, Mazovian, Zbójnian, Lublinian and Eemian. The ranges of glacial transgressions, and key interglacial and preglacial sites are assembled in a cumulative scheme for the area of Poland. We review the main study methods on which the subsequent versions of the stratigraphic scheme were based. These include Prof. Lindner’s own detailed field research in glaciated and extraglacial areas, and paleofloristic, paleontological and paleomagnetic studies of major interglacial sites carried out by numerous researchers, as well as thorough literature studies.

Go to article

Authors and Affiliations

Jan Dzierżek

1

Bogusz Kulus

1

University of Warsaw, Faculty of Geology, Żwirki i Wigury 93, 02-089 Warszawa, Poland

The Effect of Adding Iron Powder From Plasma Cutting on the Microstructure, Mechanical Properties of the Composite Based on Aluminum Powder Matrix Made Using Powder Metallurgy

M. Wędrychowicz A.W. Bydałek P. Migas T. Skrzekut P. Noga P. Madej A. Kałasznikow

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 1 | 273-289 | DOI: 10.24425/amm.2021.134785

Keywords Al-Fe composite iron powder plasma cutting aluminum matrix composites powder metallurgy mechanical properties

Download PDF Download RIS Download Bibtex

Abstract

The paper presents the results of research on the effect of added iron powder from plasma cutting on the mechanical properties and structure of a composite rod based on aluminum powder. The iron powder came from plasma cutting of steel elements and was handed over by the enterprise “AK Anatol” from Żary. One of the ways to dispose of it is to use it as a filler in aluminum composite rods. Research shows that Fe can be distributed in aluminum evenly, and increase in mechanical properties is achieved at the expense of only a slight increase in density. The proposed system does not reduce the amount of waste produced by plasma cutting but finds a use for some of it. The sintering point of the powder required a strongly reducing atmosphere (PO2 < 10–50 atm) which seems virtually unachievable under laboratory conditions. The reinforcing mechanism is related to the fragmentation of the matrix aggregate particles and the uniform distribution of Fe particles in the aluminum matrix.

Go to article

Authors and Affiliations

M. Wędrychowicz

A.W. Bydałek

P. Migas

e-mail:

ORCID:

T. Skrzekut

P. Noga

P. Madej

A. Kałasznikow

Refined energy method for the elastic flexural-torsional buckling of steel H-section beam-columns. Part II: Comparison and verification for elements LTU and LTR

Marian Giżejowski Anna Barszcz Paweł Wiedro

Archives of Civil Engineering | 2023 | vol. 69 | No 2 | 265-289 | DOI: 10.24425/ace.2023.145267

Keywords steel beam-column bisymmetric double-tee section elastic behaviour flexural-torsional buckling numerical simulations verification of analytical solutions

Download PDF Download RIS Download Bibtex

Abstract

In investigations constituting Part I of this paper, the effect of approximations in the flexural-torsional buckling analysis of beam-columns was studied. The starting point was the formulation of displacement field relationships built straightforward in the deflected configuration. It was shown that the second-order rotation matrix obtained with keeping the trigonometric functions of the mean twist rotation was sufficiently accurate for the flexural-torsional stability analysis. Furthermore, Part I was devoted to the formulation of a general energy equation for FTB being expressed in terms of prebuckling stress resultants and in-plane deflections through the factor k ₁. The energy equation developed there was presented in several variants dependent upon simplified assumptions one may adopt for the buckling analysis, i.e. the classical form of linear eigenproblem analysis (LEA), the form of quadratic eigenproblem analysis (QEA) and refined (non-classical) forms of nonlinear eigenproblem analysis (NEA), all of them used for solving the flexural-torsional buckling problems of elastic beamcolumns. The accuracy of obtained analytical solutions based on different approximations in the elastic flexural–torsional stability analysis of thin-walled beam-columns is examined and discussed in reference to those of earlier studies. The comparison is made for closed form solutions obtained in a companion paper, with a scatter of results evaluated for k ₁ = 1 in the solutions of LEA and QEA, as well as for all the options corresponding to NEA. The most reliable analytical solution is recommended for further investigations. The solutions for selected asymmetric loading cases of the left support moment and the half-length uniformly distributed span load of a slender unrestrained beam-column are discussed in detail in Part II. Moreover, the paper constituting Part II investigates how the buckling criterion obtained for the beam-column laterally and torsionally unrestrained between the end sections might be applied for the member with discrete restraints. The recommended analytical solutions are verified with use of numerical finite element method results, considering beam-columns with a mid-section restraint. A variant of the analytical form of solutions recommended in these investigations may be used in practical application in the Eurocode’s General Method of modern design procedures for steelwork.

Go to article

Authors and Affiliations

Marian Giżejowski

1

e-mail:

ORCID:

Anna Barszcz

1

e-mail:

ORCID:

Paweł Wiedro

1

e-mail:

ORCID:

Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland

Numerical determination of load of a model tunnel lining, taking into account different heights of soil backfill

Paweł Szklennik

Archives of Civil Engineering | 2022 | vol. 68 | No 3 | 289-305 | DOI: 10.24425/ace.2022.141886

Keywords discrete element method cylindrical tunnel lining underground tunnel

Download PDF Download RIS Download Bibtex

Abstract

The paper presents an analysis of determining the load of a model tunnel lining in a noncohesive soil medium at two different heights of soil backfill above the structure. A series of simulations were performed with the flexible and rigid tunnel lining. The analysis was performed by conducting simulations with the use of an author’s program based on the discrete element method. The model previously calibrated on the basis of laboratory tests was used. The loads acting on the structure, the distribution of stresses in the surrounding soil medium and the displacements of this medium in the vicinity of the structure were determined and compared. The effect of soil weight and technological load applied from the surface was taken into account. The values of the numerically obtained loads of the tunnel lining were compared with those calculated according to the classic Hewett’s method.
It has been proven that in both cases the degree of cooperation between the structure and soil is significantly related to the rigidity of the structure, hence the loads determined may differ significantly from the results obtained according to classical methods. It was shown that discrete modelling allows to reflect differences in the behaviour of the soil medium resulting from different heights of soil backfill. Smaller horizontal pressure was obtained in the side zones of an excavation at a higher backfill. In addition, significantly greater intensity of vertical soil displacements over the lining were observed with a lower backfill height.

Go to article

Authors and Affiliations

Paweł Szklennik

1

e-mail:

ORCID:

Military University of Technology, Faculty of Civil Engineering and Geodesy, ul. Gen. Sylwestra Kaliskiego 2 00-908 Warsaw, Poland

Compressible boundary layer flow in the stagnation region of a rotating sphere with large injection rates and a magnetic field

Mahesh Kumari Girishwar Nath

Archive of Mechanical Engineering | 2000 | vol. 47 | No 4 | 289-309

Keywords boundary layer flow rotating sphere large injection magnetic field

Download PDF Download RIS Download Bibtex

Abstract

The effect of large injection rates on the steady laminar compressible boundary layer in the front stagnation-point region of a rotating sphere with a magnetic field has been studied. The effect of variable gas properties, non-unity Prandtl number and viscous dissipation are included in the analysis. The nonlinear coupled ordinary differential equations governing the flow are first linearized using the quasilinearization technique, and the resulting system of linear equations are then solved using an implicit finite-difference scheme with non-uniform step size. For large injection rates, analytical expressions for the surface shear stresses in the longitudinal and rotating directions and the surface heat transfer are also obtained using an approximate method. For large injection rates, the surface heat transfer tends to zero, but the surface shear stresses in the longitudinal and rotating directions remain finite but small. The surface shear stresses and the surface heat transfer decrease with increasing rate of injection, but they increase with the magnetic field and the rotation parameter. The magnetic field or the rotation parameter induces an overshoot in the longitudinal velocity profile and the magnitude of the velocity overshoot increases significantly with the rotation parameters and the injection parameter. The location of the dividing streamline moves away from the boundary with increasing injection rate, but it moves towards the boundary with increasing magnetic and rotation parameters.

Go to article

Authors and Affiliations

Mahesh Kumari

Girishwar Nath

Stanisław Tabaczyński (1930–2020)

Dariusz Wyczółkowski

Wiadomości Numizmatyczne | 2021 | Rok LXV | 289-291

Download PDF Download RIS Download Bibtex

Authors and Affiliations

Dariusz Wyczółkowski

Linking Work Events with Work Engagement: Mediating Role of Emotions and Moderating Role of Psychological Capital

Aleksandra Penza Agata Gasiorowska

Polish Psychological Bulletin | 2023 | vol. 54 | No 4 | 289-308 | DOI: 10.24425/ppb.2023.148848

Keywords work engagement psychological capital work events work-related emotions affective events theory broaden-and-build theory

Download PDF Download RIS Download Bibtex

Abstract

We examined the role of work-related emotions and personal resources operationalised as psychological capital (PsyCap) in the relationship between events occurring at work and employees’ work engagement. Using affective events theory and broaden-and-build theory as theoretical frameworks, we theorise that the perceived frequency of positive and negative events at work and work engagement is mediated by positive and negative work-related emotions and moderated by PsyCap. The results of path analysis on a sample of US and Polish employees showed that PsyCap moderated the relationship between the perceived frequency of negative work events and negative work-related emotions, however, we also found culture-specific effects of PsyCap. Our study contributes to the human resource development (HRD) literature by providing evidence of the role of personal resources in the event–emotion–engagement process in the workplace. Also, our findings deepen the understanding of HR developers in multinational organisations and provide suggestions on how they can implement PsyCap trainings based on culture-specific work environment.

Go to article

Authors and Affiliations

Aleksandra Penza

1

e-mail:

ORCID:

Agata Gasiorowska

1

e-mail:

ORCID:

SWPS University, Wrocław, Poland

Search results

Filters

Search results

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Bibliography

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Bibliography

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Bibliography

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Bibliography

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Abstract

Authors and Affiliations

Authors and Affiliations

Abstract

Authors and Affiliations