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New materials require the use of advanced technology in manufacturing parts of complex shape. One of the modern non-conventional technology of manufacturing difficult to cut materials is the wire electrical discharge machining (WEDM). The article presents the results of theoretical and experimental research in the influence of the WEDM conditions and parameters on the shape deviation during a rough cut. A numerical model of the dielectric flow in the gap (ANSYS) was developed. The influence of the dielectric velocity field in the gap on the debris evacuation and stability of WEDM process was discussed. Furthermore, response surface methodology (RSM) was used to build empirical models for influence of the wire speed Vd, wire tension force Fn, the volume flow rate of the dielectric Qv on the flatness deviation after the WEDM.

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Authors and Affiliations

R. Świercz

D. Oniszczuk-Świercz

J. Zawora

M. Marczak

Effect of dietary supplementation with Echinacea purpurea on vaccine efficacy against infection with Flavobacterium columnare in zebrafish (Danio rerio)

L. Guz K. Puk N. Walczak T. Oniszczuk A. Oniszczuk

Polish Journal of Veterinary Sciences | 2014 | No 4 | DOI: 10.2478/pjvs-2014-0087

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Authors and Affiliations

L. Guz

K. Puk

N. Walczak

T. Oniszczuk

A. Oniszczuk

Changes Of Specific Mechanical Energy During Extrusion-Cooking Of Potato Starch

Marcin Mitrus Tomasz Oniszczuk Leszek Mościcki

Teka Commission of Motorization and Power Industry in Agriculture | 2011 | No 11c

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Authors and Affiliations

Marcin Mitrus

Tomasz Oniszczuk

Leszek Mościcki

Electrical discharge machining of difficult to cut materials

Rafał Świercz Dorota Oniszczuk-Świercz Lucjan Dąbrowski

Archive of Mechanical Engineering | 2018 | vol. 65 | No 4 | 461-476 | DOI: 10.24425/ame.2018.125437

Keywords EDM Inconel 718 surface roughness material removal rate Response surface methodology (RSM)

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Abstract

The development of industry is determined by the use of modern materials in the production of parts and equipment. In recent years, there has been a significant increase in the use of nickel-based superalloys in the aerospace, energy and space industries. Due to their properties, these alloys belong to the group of materials hard-to-machine with conventional methods. One of the non-conventional manufacturing technologies that allow the machining of geometrically complex parts from nickel-based superalloys is electrical discharge machining. The article presents the results of experimental investigations of the impact of EDM parameters on the surfaces roughness and the material removal rate. Based on the results of empirical research, mathematical models of the EDM process were developed, which allow for the selection of the most favourable processing parameters for the expected values of the surface roughness Sa and the material removal rate.

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Authors and Affiliations

Rafał Świercz

1

Dorota Oniszczuk-Świercz

1

Lucjan Dąbrowski

1

Warsaw University of Technology, Institute of Manufacturing Technology, Warsaw, Poland.

Relationships between quality of life and comprehensive geriatric assessment among seniors — a cross-sectional study in Krakow, Poland

Anna Pachołek Eliza Siemaszko-Oniszczuk Joanna Mierzwa Anna Wróbel Karolina Piotrowicz Jerzy Gąsowski Tomasz Tomasik

Folia Medica Cracoviensia | 2023 | Vol. 63 | No 1 | 5-17 | DOI: 10.24425/fmc.2023.145426

Keywords quality of life EQ-5D-5L general practitioner comprehensive geriatric assessment Poland

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Abstract

Background: Due to current increased life expectancy, the quality of life (QoL) of senior patients is gaining in importance. The aims of this study were: to estimate QoL in a group of patients, aged above 64 years, that is cared for by general practitioners (GPs) in Krakow, Poland, and to find relation-ships between elements of QoL and the results of comprehensive geriatric assessment (CGA) and other important medical and social factors.
Methods: We designed a cross-sectional, questionnaire study among patients who attended GPs’ sur-geries from April 2018 to April 2019. To examine the patients, we used the Euro-Quality of Life Ques-tionnaire (EQ-5D-5L) and eight scales forming CGA: the Activities of Daily Living, the Instrumental Activities of Daily Living, Mini-Mental State Examination, Geriatric Depression Scale, Timed Up and Go Test, Mini Nutritional Assessment, Clinical Frailty Scale and Athens Insomnia Scale.
Results: The lowest QoL was observed in dimensions of pain/discomfort and mobility, where 70% and 52% of patients, respectively, reported problems in these areas. Only 91 (21%) respondents had highest results in all five dimensions of QoL. The average score in the Visual Analogue Scale (VAS) of the EQ-5D- 5L (representing self-rated health on a given day) was 62.36 ± 18.98 points. Statistically significant relationships were observed between QoL and age, physical activity and multimorbidity (in all cases p <0.001). The results of QoL were correlated with every aspect of CGA, while the strongest relationship was noticed between scores in the EQ-5D-5L VAS scale and scales assessing depression and frailty (p <0.001; r = –0.57 both).
Conclusions: Our study showed that in senior patients in Krakow QoL was relatively high. Seniors mostly complained of pain/discomfort and problems with mobility. Moreover, dimensions of QoL were connected with the results of CGA. During visits, GPs should specifically question patients about the above mentioned aspects of QoL.

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Authors and Affiliations

Anna Pachołek

1 2

Eliza Siemaszko-Oniszczuk

3

Joanna Mierzwa

4

Anna Wróbel

5

Karolina Piotrowicz

6

Jerzy Gąsowski

6

Tomasz Tomasik

1 2

Department of Family Medicine, Jagiellonian University Medical College, Kraków, Poland
The College of Family Physicians in Poland
Department of Endocrinology, Diabetology and Internal Diseases, University Clinical Hospital, Białystok, Poland
Second Department of Internal Diseases, Dietl Specialist Hospital, Krakow, Poland
Department of Internal Diseases, City Hospital of Ruda Śląska, Ruda Śląska, Poland
Department of Internal Medicine and Gerontology, Jagiellonian University Medical College, Kraków, Poland

Effect of flax fibers addition on the mechanical properties and biodegradability of biocomposites based on thermoplastic starch

Gabriel Borowski Tomasz Klepka Małgorzata Pawłowska Maria Cristina Lavagnolo Tomasz Oniszczuk Agnieszka Wójtowicz Maciej Combrzyński

Archives of Environmental Protection | 2020 | vol. 46 | No 2 | 74-82 | DOI: 10.24425/aep.2020.133477

Keywords biocomposite flax fiber maize starch extrusion-cooking biodegradation energy recovery

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Abstract

The research was intended to develop a biocomposite as an alternative biodegradable material, for the production of, e.g., disposable utensils. The author’s tested thermoplastic maize starch, both without additives and with the addition of crumbled fl ax fi ber in the share of 10, 20 and 30 wt%. The plasticizer added was technical glycerin and the samples were produced by a single-screw extruder. The mechanical strength tests were performed, including the impact tensile test and three-point bending fl exural test. Afterwards, the samples were tested for biodegradability under anaerobic conditions. The methane fermentation process was carried in a laboratory bioreactor under thermophilic conditions with constant mixing of the batch. All samples proved to be highly susceptible to biodegradation during the experiment, regardless of the fl ax fi ber share. The biogas potential was about 600 ml·g-1, and the methane concentration in biogas ranged from 66.8 to 69.6%. It was found, that the biocomposites can be almost completely utilized in bioreactors during the biodegradation process. The energy recovery in the decomposition process with the generation of signifi cant amount of methane constitutes an additional benefi t.

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Authors and Affiliations

Gabriel Borowski

1

e-mail:

ORCID:

Tomasz Klepka

2

Małgorzata Pawłowska

1

Maria Cristina Lavagnolo

3

Tomasz Oniszczuk

4

Agnieszka Wójtowicz

4

Maciej Combrzyński

4

Faculty of Environmental Engineering, Lublin University of Technology, Lublin, Poland
Faculty of Mechanical Engineering, Lublin University of Technology, Lublin, Poland
Department of Civil Environmental and Architectural Engineering, University of Padova, Italy
Department of Thermal Technology and Food Process Engineering, University of Life Sciences in Lublin, Poland