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Nitrogen and Phosphorus Compounds in Lake Pluszne

Jolanta Katarzyna Grochowska Renata Tandyrak
Archives of Environmental Protection | 2007 | vol. 33 | No 1 | 59-66
Keywords lake eutrophication nutrients nitrogen phosphorus
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Authors and Affiliations

Jolanta Katarzyna Grochowska
ORCID: ORCID
Renata Tandyrak

Distortion Analysis of Thin-Walled Investment Castings

R. Mandal S. Roy S. Sarkar T. Mandal A.K. Pramanick G. Majumdar
Archives of Foundry Engineering | 2023 | vol. 23 | No 3 | 59-66 | DOI: 10.24425/afe.2023.146663
Keywords Dokra casting Thin-walled investment casting Distortion dimensional accuracy SEM
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Abstract

Dokra casting is famous for its Artistic value to the world but it is also sophisticated engineering. The technique is almost 4500 years old. It is practiced by the tribal artisans of India. It is a clay moulded wax-based thin-walled investment casting technique where liquid metal was poured into the red hot mould. Dimensional accuracy is always preferable for consumers of any product. Distortion is one of the barriers to achieving the accurate dimension for this type of casting especially for the bending parts. The cause and nature of the distortion for this type of casting must be analyzed to design a product with nominal tolerance and dimensional accuracy.
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Bibliography

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Authors and Affiliations

R. Mandal
1
S. Roy
2
ORCID: ORCID
S. Sarkar
1
T. Mandal
3
A.K. Pramanick
2
G. Majumdar
1
  1. Mechanical Engineering Department, Jadavpur University, India
  2. Metallurgical and Material Engineering Department, Jadavpur University, India
  3. Metallurgy and Materials Engineering, IIEST Shibpur, India

Acoustic Nonlinearity Parameter B/A, Internal Pressure,and Acoustic Impedance Determined at Pressures up to 100 MPafor 1-Ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide

Edward Zorębski Michał Zorębski Marzena Dzida
Archives of Acoustics | 2016 | vol. 41 | No 1 | 59-66 | DOI: 10.1515/aoa-2016-0006
Keywords nonlinearity parameter speed of sound high pressure ionic liquids internal pressure
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Abstract

The nonlinearity parameter B/A, internal pressure, and acoustic impedance are calculated for a room temperature ionic liquid, i.e. for 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide for temperatures from (288.15 to 318.15) K and pressures up to 100 MPa. The B/A calculations are made by means of a thermodynamic method. The decrease of B/A values with the increasing pressure is observed. At the same time B/A is temperature independent in the range studied. The results are compared with corresponding data for organic molecular liquids. The isotherms of internal pressure cross at pressure in the vicinity of 70 MPa, i.e. in this range the internal pressure is temperature independent.
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Authors and Affiliations

Edward Zorębski
Michał Zorębski
Marzena Dzida

The accuracy of loss prediction in magnetic materials

Jan Szczygłowski Paweł Kopciuszewski Krzysztof Chwastek Mariusz Najgebauer Wiesław Wilczyński
Archives of Electrical Engineering | 2011 | vol. 60 | No 1 March | 59-66 | DOI: 10.2478/v10171-011-0006-7
Keywords soft magnetic materials loss prediction bootstrap technique
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Abstract

The paper presents a formula useful for prediction of loss density in soft magnetic materials, which takes into account multi-scale energy dissipation. A universal phenomenological P(Bm, f) relationship is used for loss prediction in chosen soft magnetic materials. A bootstrap method is used to generate additional data points, what makes it possible to increase the prediction accuracy. A substantial accuracy improvement for estimated model parameters is obtained in the case, when additional data points are taken into account. The proposed description could be useful both for device designers and researchers involved in computational electromagnetism.
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Authors and Affiliations

Jan Szczygłowski
Paweł Kopciuszewski
Krzysztof Chwastek
Mariusz Najgebauer
Wiesław Wilczyński

Spatial variability and dynamics of soil pH, soil organic carbon and matter content: The case of the Wonji Shoa sugarcane plantation

Megersa Olumana Dinka Meseret Dawit
Journal of Water and Land Development | 2019 | No 42 | 59-66
Keywords organic matter content pH soil organic carbon soil quality sugarcane
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Abstract

This study presents the spatial variability and dynamics of soil organic carbon (SOC), soil organic matter (SOM) and soil pH contents at the Wonji Shoa Sugar Estate (WSSE), Ethiopia. Soil samples were collected immediately after the sug-arcane was harvested and then analysed for SOC, SOM and pH content using standard procedures. The analysis resultsshowed that the pH value varied between 6.7–8.4 (neutral to moderately alkaline) and 7.3–8.5 (neutral to strongly alkaline) for the top and bottom soil profiles, respectively. The SOM content is in the range of 1.1–6.7% and 0.74–3.3% for the upper and lower soil layers, respectively. Nearly 45% of the samples demonstrated a SOM content below the desirable threshold (<2.1%) in the bottom layer and, hence, inadequate. Moreover, most of the topsoil layer (95%) has an SOM content exceed-ing the desirable limit and hence is categorized within the normal range. Interestingly, the SOC content showed a spatial variability in both the surface and sub-surface soil layers. A lower SOC and SOM content was found for the sub-soil in the south and southwestern part of the plantation. A further decline in the SOC and SOM content may face the estate if the cur-rent waterlogging condition continues in the future for a long period. Overall, the study result emphasizes the need to min-imize the pre-harvest burning of sugarcane and action is needed to change the irrigation method to green harvesting to fa-cilitate the SOC retention in the soil and minimize the greenhouse emission effect on the environment, hence improving soil quality in the long-term.

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Authors and Affiliations

Megersa Olumana Dinka
Meseret Dawit

DYNAMIC CHARACTERISTICS MEASUREMENTS OF A FORCE TRANSDUCER AGAINST SMALL AND SHORT-DURATION IMPACT FORCES

Mitra Djamal Kazuhide Watanabe Kyohei Irisa Irfa Aji Prayogi Akihiro Takita Takao Yamaguchi Yusaku Fujii
Metrology and Measurement Systems | 2014 | No 1 | 59-66 | DOI: 10.2478/mms-2014-0006
Keywords dynamic force impulse response force transducer force sensor inertial force optical interferometer
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Abstract

A method for evaluating the dynamic characteristics of force transducers against small and short-duration impact forces is developed. In this method, a small mass collides with a force transducer and the impact force is measured with high accuracy as the inertial force of the mass. A pneumatic linear bearing is used to achieve linear motion with sufficiently small friction acting on the mass, which is the moving part of the bearing. Small and short-duration impact forces with a maximum impact force of approximately 5 N and minimum half-value width of approximately 1 ms are applied to a force transducer and the impulse responses are evaluated.

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Authors and Affiliations

Mitra Djamal
Kazuhide Watanabe
Kyohei Irisa
Irfa Aji Prayogi
Akihiro Takita
Takao Yamaguchi
Yusaku Fujii

M/G/n/0 Erlang queueing system with heterogeneous servers and non-homogeneous customers

M. Ziółkowski
Bulletin of the Polish Academy of Sciences Technical Sciences | 2018 | 66 | No 1 | 59-66
Keywords multi-server queueing systems queueing systems with non-homogeneous customers queueing systems with heterogeneous servers total volume distribution Laplace–Stieltjes transform
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Authors and Affiliations

M. Ziółkowski

The monetary weight and accounting system in Lower Silesia after the reform by Henry III the White

Krzysztof Wachowski
Wiadomości Numizmatyczne | 2002 | Rok XLVI | Zeszyt 1 (173) | 59-66
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Authors and Affiliations

Krzysztof Wachowski

Spesia antarctica gen. et sp. nov. - a new fertile fern spike from the Jurassic of Antarctica

Anna Maria Ociepa Maria Barbacka
Polish Polar Research | 2011 | No 1 | 59-66 | DOI: 10.2478/v10183−011−0007−7
Keywords Antarctic Peninsula Mount Flora Formation Jurassic palaeobotany plantreproductive organ
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Abstract

The well−known Jurassic macrofloras from Hope Bay at the northernmost tip of the Antarctic Peninsula continue to yield new taxa . This paper reports on a new type of plant re− productive organ. The affinity of this organ r emains unclear; it may be affiliated with the Schizaceae or Osmundaceae, but similarities to po llen organs of the Podocarpaceae are also discussed. Because the fossils differ from hitherto known Mesozoic fertile fronds and conifer pollen organs in some details, the new taxon, Spesia antarctica nov. gen. et sp. is proposed.
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Authors and Affiliations

Anna Maria Ociepa
Maria Barbacka

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