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Recollection of Memories: Andrzej Wasilkowski 1932-2020

Jerzy Menkes

Polish Yearbook of International Law | 2019 | No XXXIX | 11-18 | DOI: 10.24425/pyil.2020.134473

Keywords ad memoriam Mutual Economic Assistance Council public international law Wasilkowski

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Abstract

On 1 March 2020, Professor Andrzej Wasilkowski died. In his research, Professor Wasilkowski undertook issues which were co-creating the mainstreams of legal debates all over the world. He was an author of valuable publications on the relationship between international law and Polish domestic law. Professor Wasilkowski was also a director of the Institute of Law Studies of the Polish Academy of Sciences and the head of the Legal Advisory Committee of the Minister of Foreign Affairs.

Authors and Affiliations

Jerzy Menkes

Shallow Water Experiment of OFDM Underwater Acoustic Communications

Iwona Kochańska Jan H. Schimdt Jacek Marszal

Archives of Acoustics | 2020 | vol. 45 | No 1 | 11-18 | DOI: 10.24425/aoa.2019.129737

Keywords underwater acoustic communications UAC orthogonal frequency-division multiplexing OFDM

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Abstract

The large variability of communication properties of underwater acoustic channels, and especially the strongly varying instantaneous conditions in shallow waters, is a challenge for the designers of underwater acoustic communication (UAC) systems. The use of phase modulated signals does not allow reliable data transmission through such a tough communication channel. However, orthogonal frequency-division multiplexing (OFDM), being a multi-carrier amplitude and phase modulation technique applied successfully in the latest standards of wireless communications, gives the chance of reliable communication with an acceptable error rate. This paper describes communication tests conducted with the use of a laboratory model of an OFDM data transmission system in a shallow water environment in Wdzydze Lake.

Authors and Affiliations

Iwona Kochańska

Jan H. Schimdt

Jacek Marszal

An Efficient Hybrid Classifier Model for Customer Churn Prediction

Anitha M A Sherly K K

International Journal of Electronics and Telecommunications | 2023 | vol. 69 | No 1 | 11-18 | DOI: 10.24425/ijet.2023.144325

Keywords customer churn prediction bag of learners ANN SVM regression associative classifier Apriori Algorithm

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Abstract

Customer churn prediction is used to retain customers at the highest risk of churn by proactively engaging with them. Many machine learning-based data mining approaches have been previously used to predict client churn. Although, single model classifiers increase the scattering of prediction with a low model performance which degrades reliability of the model. Hence, Bag of learners based Classification is used in which learners with high performance are selected to estimate wrongly and correctly classified instances thereby increasing the robustness of model performance. Furthermore, loss of interpretability in the model during prediction leads to insufficient prediction accuracy. Hence, an Associative classifier with Apriori Algorithm is introduced as a booster that integrates classification and association rule mining to build a strong classification model in which frequent items are obtained using Apriori Algorithm. Also, accurate prediction is provided by testing wrongly classified instances from the bagging phase using generated rules in an associative classifier. The proposed models are then simulated in Python platform and the results achieved high accuracy, ROC score, precision, specificity, F-measure, and recall.

Authors and Affiliations

Anitha M A

1

Sherly K K

2

Faculty of Computer Science and Engineering, College of Engineering Cherthala, Alappuzha, Kerala, India
Information Technology Department, Rajagiri School of Engineering & Technology Kochi-682039, Kerala, India

Gaseous Atmosphere During Gas Forming Tendency Measurements of the Selected Protective Coatings for Sand Moulds

J. Mocek

Archives of Foundry Engineering | 2021 | vo. 21 | No 3 | 11-18 | DOI: 10.24425/afe.2021.136107

Keywords Gas forming tendency oxygen hydrogen Carbon monoxide Protective coatings

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Abstract

Protective coatings have direct contacts with hot and liquid alloys. As the result of such contacts gases are emitted from coatings. Gas forming is a tendency of the tested material to emit gases under a temperature influence. In order to assess the gas forming tendency either direct or indirect methods are applied. In the hereby work, the measurements of the gas forming tendency were performed under laboratory conditions, by means of the developed indirect method. The research material constituted samples of six selected protective coatings dissolved either in alcohol or in water. These coatings are applied in sand moulds and cores for making cast iron castings. The assessment of their gas forming tendency was presented in relation to temperatures and heating times. The occurrence and changes of oxygen and hydrogen contents in gases outflowing from the measuring flask during tests, were measured by means of gas sensors. The process of the carbon monoxide (CO) emission during tests was also assessed. The following gas sensors were installed in flow-through micro chambers: for oxygen - lambda probe, for hydrogen – pellistor, for carbon monoxide - sensor (dedicated for CO) FIGARO TGS 822 TF. The results of direct CO measurements were recalculated according to the algorithm supplied by the producer of this sensor.

Bibliography

[1] Di Muoio G.L., Skat Tiedje N., Budolph Johansen B. (2014). Automatic vapour sorption analysis as new methodology for assessing moisture content of water based foundry coating and furan sands. Mar del Plata, BS. As., Argentina
[2] Nwaogu, U. & Tiedje, N. (2011). Foundry coating technology: A Review. Materials Sciences and Applications. 2(8), 1143-1160. DOI: 10.4236/msa.2011.28155.
[3] Scarber Jr, P., Bates, C. & Griffin, J. (2006). Avoiding gas defects through mold and core package design. Modern Casting. 96(12), 38-40.
[4] Zych, J, Mocek, J. (2019). Thermal Volumetric Analysis (TVA): a new test method of the kinetics of gas emissions from moulding sands and protective coatings heated by liquid alloy. London: IntechOpen, 13-33. ISBN: 978-1- 78985-161-8; e-ISBN: 978-1-78985-162-5. https://www.intechopen.com/chapter/pdf-download/62133.
[5] Z.B.P. SENSOR GAZ Andrzej Rejowicz. Explosimetric sensing head. Retrieved January 15, 2021 from http://sensorgaz.com.pl/wp-content/uploads/2017/06/EKP1WH.pdf
[6] Figaro Engineering Inc. Tentative product information TGS822TF. Retrieved January 15, 2021 from https://cdn.sos.sk/productdata/ad/97/a7c71525/tgs-822tf.pdf
[7] HA International. Refractory Coating Products. Retrieved January 15, 2021 from https://www.ha.international.com/content/products/refractory _coatings/refractory_coatings.aspx
[8] Marć, A.W. (2018). Multi-parameter assessment of gas formation of selected protective coatings for sand forms. Master thesis. Kraków: AGH WO. (in Polish).
[9] Mocek, J. (2019). Multiparameter assessment of the gas forming tendency of foundry sands with alkyd resins. Archives of Foundry Engineering. 19(2), 41-48.
[10] Zych, J., Mocek, J. & Snopkiewicz, T. (2014). Gas generation properties of materials used in the sand mould technology – modified research method. Archives of Foundry Engineering. 14(3), 105-109.
[11] Lewandowski, J.L., Solarski, W. & Pawłowski, Z. (1993). Classification of molding and core sands in terms of gas formation. Przegląd Odlewnictwa. 5, 143-149. (in Polish).
[12] Lewandowski, J.L. (1997). Foundry mold materials. Kraków. (in Polish).
[13] Mocek, J. & Chojecki, A. (2009). Evolution of the gas atmosphere during filing the sand moulds with iron alloys. Archives of Foundry Engineering. 9(4), 135-140.
[14] Pietkun-Greber I. Janka R. (2010). Effect of hydrogen on metals and alloys. Proceedings of EC Opole. 4(2), 471-476. (in Polish).
[15] Bobrowski, A., Holtzer, M., Dańko, R. & Żymankowska-Kumon S. (2013). Analysis of gases emitted during a thermal decomposition of the selected phenolic binders. Metalurgia International. 18(si.7), 259-261.
[16] Holtzer, M., Kwaśniewska-Królikowska, D., Bobrowski, A., Dańko, R., Grabowska, B., Żymankowska-Kumon, S., & Solarski, W. (2012). Investigations of a harmful components emission from moulding sands with bentonite and lustrous carbon carriers when in contact with liquid metals. Przegląd Odlewnictwa. 62(3-4), 124-132.
[17] Holtzer, M., Dańko, R., Kmita, A., Drożyński, D., Kubecki, M., Skrzyński, M., Roczniak, A. (2020). Environmental Impact of the Reclaimed Sand Addition to Molding Sand with Furan and Phenol-Formaldehyde Resin-A Comparison. Materials. 13, 4395, 1-12. DOI: 10.3390/ma13194395 www.mdpi.com/journal/materials.

Authors and Affiliations

J. Mocek

1

AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Moulding Materials, Mould Technology and Cast Non-Ferrous Metals, Al. Mickiewicza 30, 30-059 Kraków, Poland

The Influence of Violin Tailpiece Material on Acoustic Properties of a Violin

Adam Łapiński Ewa Skrodzka Andrzej Wicher

Archives of Acoustics | 2024 | vol. 49 | No 1 | 11-18 | DOI: 10.24425/aoa.2024.148774

Keywords tailpiece violin acoustical properties exotic materials violin-making luthiery

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Abstract

The different mechanical properties of the materials from which the tailpieces are made have a noticeable effect on the acoustic performance of the violin. These elements are made today from ebony, rosewood, boxwood, aluminium, or plastic. The aim of this study was to check the exact impact of tailpieces made of different materials on the frequency response function (FRF) of a violin’s bridge and the timbre of the instrument’s sound. For this purpose, the bridge FRF measurement was carried out, and a psychoacoustic test was conducted. The material from which the tailpiece is made to the greatest extent affects the modal frequencies in the range 530–610 Hz (mode B1+), which mainly manifested itself in a change in the instrument’s timbre in terms of the brightness factor. The study showed that the lighter the tailpiece, the darker the sound of the violin. It was also revealed that the selection of accessories affects factors such as openness, thickness, and overall quality of the sound.

Authors and Affiliations

Adam Łapiński

1

Ewa Skrodzka

2

e-mail:

ORCID:

Andrzej Wicher

2

e-mail:

ORCID:

The Ignacy Jan Paderewski Academy of Music in Poznan Poznan, Poland
Department of Acoustics, Faculty of Physics Adam Mickiewicz University

First record od Tomato black ring virus (TBRV) in the natural infection of Cucumis sativus in Poland

Henryk Pospieszny Magdalena Jończyk Natasza Borodynko

Journal of Plant Protection Research | 2003 | vol. 43 | No 1 | 11-18

Keywords cucumber TBRV serology immunocapture RT-PCR satellite RNA

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Abstract

From the naturally infected cucumber plane spherical virus was isolated that mainly on basis of its serological properties has been identified as Tomato black ring virus (TBRV). Using antiserum against TBRV-ED for the specific crapping of virus followed by PCR test (immunocapture-RT-PCR) allowed co distinguish TBRV from related viruses, especially Beet ringspot virus (BRSV). Presence of as many as rwo satellite RNAs should be found as a unique feature of the cucumber isolace.

Authors and Affiliations

Henryk Pospieszny

Magdalena Jończyk

Natasza Borodynko

Elimination of Zinc from Aluminum During Remelting in an Vacuum Induction Furnace

Albert Smalcerz Leszek Blacha B. Węcki D.G. Desisa J. Łabaj M. Jodkowski

Archives of Foundry Engineering | 2022 | vol. 22 | No 3 | 11-18 | DOI: 10.24425/afe.2022.140231

Keywords Mass transfer coefficient Zinc evaporation Vacuum induction furnace Meniscus

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Abstract

In this paper, the results of the study on aluminium evaporation from the Al-Zn alloys (4.2% weight) during remelting in a vacuum induction furnace (VIM) are presented. The evaporation of components of liquid metal alloys is complex due to its heterogeneous nature. Apart from chemical affinity, its speed is determined by the phenomena of mass transport, both in the liquid and gas phase. The experiments were performed at 10-1000 Pa for 953 K - 1103 K. A significant degree of zinc loss has been demonstrated during the analysed process. The relative values of zinc loss ranged from 4 to 92%. Lowering the pressure in the melting system from 1000 Pa to 10 Pa caused an increase in the value of density of the zinc evaporating stream from 3.82⋅10-5 to 0.000564 g⋅cm-2⋅s-1 at 953 K and 3.32⋅10-5 to 0.000421 g⋅cm-2⋅s-1 for 1103 K. Based on the results of the conducted experiments. it was found that evaporation of zinc was largely controlled by mass transfer in the gas phase and only for pressure 10 Pa this process was controlled by combination of both liquid and gas phase mass transfer.

Bibliography

[1] Guo, J., Liu, Y. & Su, Y. (2002). Evaporation of multi-components in Ti-25Al-25Nb melt during induction skull melting process. Transaction of Nonferrous Metals Society of China. 12(4), 587-591.
[2] Blacha, L., Mizera, J. & Folega, P. (2013). The effects of mass transfer in the liquid phase on the rate of aluminium evaporation from the Ti-6Al-7Nb alloy. Metalurgija, 53(1), 51-54.
[3] HSC Chemistry ver. 6.1. Outocumpu Research Oy. Pori.
[4] Plewa, J. (1987). Examples of calculations from the theory of metallurgical processes. Gliwice: Wydawnictwo Politechniki Śląskiej. (in Polish).
[5] Ozberk, E. & Guthrie, R. (1986). A kinetic model for the vacuum refining of inductively stirred copper melts. Metallurgical Transactions B. 17, 87-103.
[6] Nash, P.M. & Steinemann, S.G. (2006). Density and thermal expansion of molten manganese. Iron. Nickel. Copper. Aluminium and Tin by Means of the Gamma-Ray Attenuation Technique. Physics and Chemistry of Liquids, An International Journal. 29(1), 43-58.
[7] Assael, M., Kakosimos, K. & Banish, R. (2006). Reference data for the density and viscosity of liquid aluminum and liquid iron. Journal of Physical and Chemical Reference Data. 35(1), 285-301.
[8] Smalcerz, A., Węcki B. & Blacha L. (2021) Influence of the power of various types of induction furnaces on the shape of the metal bath surface. Advances in Science and Technology Research Journal. 15(3), 34-42. DOI: 10.12913/22998624/138245
[9] Homma, M., Ohno, R., & Ishida, T. (1996). Evaporation of manganese. copper. and tin from molten iron under, vacuum. Science Reports of the Research Institutes, Tohuku University. Series A – Physics. chemistry and metallurgy. 18, 356-365.
[10] Ohno, R. & Ishida, T. (1967). Solution rate of solid iron in liquid copper, ISIJ International. 31(10), 1164-1169.
[11] Chen, X. & Ito, N. (1995). Evaporation rate of copper in high carbon iron melt under reduced pressure. Tetsu-to-Hagane. 81(10), 959-964.
[12] Savov, L. & Janke, D. (2000). Evaporation of cu and sn from induction-stirred iron-based melts treated at reduced pressure. ISIJ International. 40(2), 95-104.
[13] Łabaj, J. (2012). Kinetics of cooper evaporation from the Fe-Cu Alloys under Reduced Pressure. Archives of Metallurgy and Materials. 57(1), 165-172.
[14] Maruyama, T., Katayama, H., Momono, T., Tayu, Y, & Takenouchi, T. (1998). Evaporation rate of copper from molten iron by urea spraying under reduced pressure. Tetsu-to-Hagane. 84(4), 243-248.
[15] Ono-Nakazato, H. & Taguchi, K. (2003). Effect of silicon and carbon on the evaporation rate of copper in molten iron. ISIJ International. 43(11), 1691-169.
[16] Bellot, J.P., Duval, H., Ritchie, M., Mitchell, A. & Ablitzer, D. (2001). Evaporation of Fe and Cr from induction-stirred austenitic stainless steel-influence of the inert gas pressure, ISIJ International. 41(7), 696-705.
[17] Siwiec, G. (2013). The kinetics of aluminium evaporation from the Ti-6Al-4V alloy. Archives of Metallurgy and Materials. 58(4), 1155-1160.
[18] Blacha, L. Golak, S. Jakovics, S. & Tucs A. (2014) Kinetic analysis of aluminum evaporation from Ti-6Al-7Nb. Archives of Metallurgy and Materials. 59, 275-279. DOI: 10.2478/amm-2014-0045.
[19] Blacha, L., Burdzik, R. Smalcerz, A. & Matuła, T. (2013). Effects of pressure on the kinetics of manganese evaporation from the OT4 alloy. Archives of Metallurgy and Materials. 58(1), 197-201.
[20] Harris, R. (1984). Vacuum refining copper melts to remove bismuth, arsenic and antimony. Metallurgical Transaction B. 15, 251-257.
[21] Harris, R., McClincy, R.J. & Riebling, E.F. (1987). Bismuth, arsenic and antimony removal from anode copper via vacuum distillation. Canadian Metallurgical Quarterly. 26(1), 1-4.
[22] Ozberk, B., Guthire, R.I.L. (1987). Vacuum melting of copper evaporation – evaporation of impurities. Proc. 6th Int. Vacuum Metallurgy Conf. American Vacuum Society. San Diego. 248-267.
[23] Machlin, E.S. (1961). Kinetics of vacuum induction refining – theory. the american institute of mining. Metallurgical. and Petroleum Engineers.
[24] Tarapore, E.D. & Evans, J. (1976). Fluid velocities in induction melting furnaces: Part I. Theory and laboratory experiments. Metallurgical Transaction B. 7, 343-351.
[25] Tarapore, E.D., Evans, J. & Langfeld, J. (1977). Fluid velocities in induction melting furnaces: Part II. large scale measurements and predictions. Metallurgical Transaction B. 8, 179-184.
[26] Szekely, J., Chang, W. & Johnson, W. (1977). Experimental measurement and prediction of melt surface velocities in a 30.000 lb inductively stirred melt. Metallurgical Transaction B. 8, 514-517.
[27] Przyłucki, R. Golak, S. Oleksiak, B. & Blacha L. (2012). Influence of an induction furnace's electric parameters on mass transfer velocity In the liquid phase. Metalurgija. 1, 67-70.
[28] Blacha, L. Przylucki, R. Golak, S. & Oleksiak B. (2011). Influence of the geometry of the arrangement inductor - crucible to the velocity of the transport of mass in the liquid metallic phase mixed inductive. Archives of Civil and Mechanical Engineering. 11, 171-179 DOI: 10.1016/S1644-9665(12)60181-2
[29] Du, Y., Chang, Y., Huang, B., Gong, W. & Jin, Z. (2003). Diffusion coefficients of some solutes in fcc and liquid Al: critical evaluation and correlation. Materials Science and Engineering: A. 363(1-2), 140-151.
[30] Harris, R. & Davenport, W.G. (1982). Vacuum distillation of liquid metals: Part I. Theory and experimental study. Metallurgical Transactions B. 13, 581-588.

Authors and Affiliations

Albert Smalcerz

e-mail:

ORCID:

Leszek Blacha

e-mail:

ORCID:

B. Węcki

1

e-mail:

ORCID:

D.G. Desisa

2

e-mail:

ORCID:

J. Łabaj

3

e-mail:

ORCID:

M. Jodkowski

1

e-mail:

ORCID:

Department of Testing and Certification "ZETOM", Poland
Department of Industrial, Informatics Silesian University of Technology, Joint Doctorate School, Poland
Faculty of Materials Engineering, Silesian University of Technology, Poland

An allelopathic evaluation of aqueous Aloe vera leaf and root extracts on the weed Sonchus oleraceus associated Vicia faba L.

Kowthar Gad El-Rokiek Abeer Nasr Shehata Samia Ameen Saad El-Din Shahira Ali Tarraf

Journal of Plant Protection Research | 2024 | vol. 64 | No 1 | 11-18 | DOI: 10.24425/jppr.2024.149157

Keywords alkaloids bioactive materials broad leaf weed faba bean water extract

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Abstract

This study aimed to evaluate the bioherbicidal effect of aqueous fresh extracts of leaves and roots of the Aloe vera plant on the broad leaf weed growth of Sonchus oleraceus associated faba bean plants. During the winters of 2020/2021 and 2021/2022, two pot experiments were carried out in the greenhouse of the National Research Center. Leaf and root aqueous extracts of Aloe vera were applied as soil and/or spray treatments at different concentrations. The results showed that there was significant inhibition in the fresh and dry biomass of S. oleraceus and was maximum with application of soil treatment (10%) of the leaf extract sequenced by spraying leaf extract at 20%. Furthermore, the inhibition of the weed growth was accompanied by an increase in the growth and yield of faba bean. The results indicated that phenols, flavonoids, alkaloids, tannins and saponins were present in the leaf extract, and there were smaller amounts of tannins and saponins in the root extract than in the leaf extract. Total phenols, flavonoids, alkaloids in the leaf extract was more than three times that of the root extract. The results also revealed that the presence of higher concentrations of natural substances in the leaf extract than in the root extracts gave it its efficiency in inhibiting the growth of S. oleraceus weeds.

Authors and Affiliations

Kowthar Gad El-Rokiek

1

Abeer Nasr Shehata

2

Samia Ameen Saad El-Din

1

Shahira Ali Tarraf

1

Botany Department, National Research Centre, Giza, Egypt
Department of Biochemistry, National Research Centre, Giza, Egypt

Analysis of birefringence property of three different nematic liquid crystals dispersed with TiO2 nanoparticles

G. Pathak R. Katiyar K. Agrahari A. Srivastava R. Dabrowski K. Garbat R. Manohar

Opto-Electronics Review | 2018 | vol. 26 | No 1 | 11-18

Keywords TiO2 nanoparticle Nematic liquid crystal Birefringence

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Abstract

In the present work TiO₂ nanoparticles (NPs) have been dispersed into three different nematic liquid crystals (2020, 1823A and 1550C) in different concentration. The value of the birefringence (Δn) has been calculated by the transmitted intensity method at a 632.8 nm wavelength. NLC 2020 used in the present study is a high birefringent material (Δn = 0.44), NLC 1550C is a low birefringent material (Δn = 0.067) and NLC 1823A is a mid birefringent material (Δn = 0.14). An increased value of birefringence has been found after dispersion of TiO₂ NPs in all three NLCs but this increment depends upon the concentration of the dopant material, temperature range and chemical character of the mixtures. It is suggested that this LC materials can be applicable in making of phase shifters, compensators and many more photonic devices.

Authors and Affiliations

G. Pathak

R. Katiyar

K. Agrahari

A. Srivastava

R. Dabrowski

K. Garbat

R. Manohar

Filozoficzne problemy nauk biologicznych w dziewięćdziesiątą rocznicę urodzin Profesora Leszka Kuźnickiego. Wprowadzenie do bloku

Włodzimierz Ługowski

Filozofia i Nauka | 2019 | Tom 7 | Część 2 | 11-18

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Authors and Affiliations

Włodzimierz Ługowski

Maritime Education and Teaching International Maritime Law

Leonard Łukaszuk

Prawo Morskie | 2000 | No XIII | 11-18

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Abstract

This article deals with maritime education in terms of teaching international maritime law. Far-reaching educational and training programmes in the field ofrecent developments in maritime law have been generated recently by the United Nations Division for Ocean Related Matters and the Law of the Sea. These aim to achieve the general adoption of the contents ofthe Convention on the law ofthe sea from 1982. Issues ofinternational maritime law have found an appropriate place in the education systems of the USA and of France. In Poland, too, this area is taught at an appropriate level within the maritime education sector.

Authors and Affiliations

Leonard Łukaszuk

Dedispersion Transform Method for Extracting the Normal Modes of a Shallow Water Acoustic Signal in the Pekeris Waveguide

Guang-Bing Yang Lian-Gang Lü Da-Zhi Gao Ying Jiang Hong-Ning Liu

Archives of Acoustics | 2015 | vol. 40 | No 1 | 11-18 | DOI: 10.1515/aoa-2015-0002

Keywords normal mode extraction dedispersion transform Pekeris waveguide source ranging

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Abstract

The normal modes cannot be extracted even in the Pekeris waveguide when the source-receiver distance is very close. This paper introduces a normal mode extraction method based on a dedispersion transform (DDT) to solve this problem. The method presented here takes advantage of DDT, which is based on the waveguide invariant such that the dispersion associated with all of the normal modes is removed at the same time. After performing DDT on a signal received in the Pekeris waveguide, the waveform of resulting normal modes is very close to the source signal, each with different position and amplitude. Each normal mode can be extracted by determining its position and amplitude parameters by applying particle swarm optimization (PSO). The waveform of the extracted normal mode is simply the waveform of the source signal; the real waveform of the received normal mode can then be recovered by applying dispersion compensation to the source signal. The method presented needs only one receiver and is verified with experimental data

Authors and Affiliations

Guang-Bing Yang

Lian-Gang Lü

Da-Zhi Gao

Ying Jiang

Hong-Ning Liu

Efficacy of solar heat in the control of bacterial soft rot of potato tubers caused by Erwinia carotovora ssp. Carotovora

Bulus Shapshi Bdliya Humphrey Umaru Haruna

Journal of Plant Protection Research | 2007 | vol. 47 | No 1 | 11-18

Keywords potato tuber soft rot solar heat control

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Abstract

The efficacy of solar heat in the control of bacterial soft rot of potato tubers was investigated in Maiduguri, semi-arid region of Northeastern Nigeria. Artificially contaminated tubers were exposed to solar heat for duration of 0, 30, 60, 120 and 180 minutes. The results showed that exposures for 120 and 180 minutes gave the highest control of the disease, although during the hot dry season (mean temperature at exposure was 54.6°C) exposure even for 30 minutes gave satisfactory control of the disease. Solar heat can therefore be used to control of bacterial soft rot of potato tubers.

Authors and Affiliations

Bulus Shapshi Bdliya

Humphrey Umaru Haruna

Influence of Modification in Centrifugal Casting on Microstructure and Mechanical Properties of Silicon Bronzes

A. Garbacz-Klempka J. Kozana M. Piękoś M. Papaj P. Papaj M. Perek-Nowak

Archives of Foundry Engineering | 2018 | vol.18 | No 3 | 11-18

Keywords Innovative foundry technologies and materials Cu-Si Alloys Centrifugal casting microstructure mechanical properties

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Abstract

Silicon bronzes are characterised by good mechanical properties and by high corrosion and mechanical wear resistance. The process of sleeve casting by means of the centrifugal casting with the horizontal axis of the mould rotation was analysed. The assessment of the influence of modification and centrifugal casting parameters on the microstructure and mechanical properties of alloys was carried out in the hereby work. Zirconium was applied as a modifier. Speed of rotation of the mould was the variable parameter of the centrifugal casting. The investigation results were summarised on the basis of the microstructure analysis and mechanical properties determination: UTS, proof stress, A10 and BHN. The experiment aimed at finding the information in which way the modification together with changing the pouring parameters influence the mechanical properties of the CuSi3Zn3FeMn alloy.

Authors and Affiliations

A. Garbacz-Klempka

J. Kozana

M. Piękoś

M. Papaj

P. Papaj

M. Perek-Nowak

“Research excellence has no gender” initiative – from awareness to transformation

Marta Gmurek Anna Kłos Jacek Ł. Kolanowski

Nauka | 2023 | No 2 | 11-18 | DOI: 10.24425/nauka.2023.146054

Keywords research excellence discrimination gender stereotypes female scientist Gender Equality Plan (GEP) Polish Young Academy CoARA

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Abstract

The problem of gender imbalance in Polish science is a clear and widely documented fact confirmed by numerous scientific studies. The gender imbalance affects both women and men depending on scientific disciplines and the level of scientific careers. The sources of this situation, leading to morally unacceptable exclusion of certain demographic groups and the underutilisation of society's full intellectual potential, are both 1) cultural and social aspects and the associated prejudice and discrimination, and 2) institutional aspects, including, inter alia, low and unequal salaries and the widespread use of anachronistic models of assessing scientific excellence that exclude non-traditional career paths and ways of conducting scientific research. In order to broaden the public dialogue on the gender imbalance in science in Poland, on 10.02.2023, the Polish Young Academy of the Polish Academy of Sciences (PAS), together with the National Science Centre, the Office of Science Promotion of the PolSCA PAS in Brussels and the Research Centre for Women's Participation in Public Space of the UAM in partnership with the L'Oreal Foundation, organised a conference entitled “Research excellence has no gender”. The event, attended by representatives and authorities of many organisations of the scientific community in Poland, inaugurated a long-term programme under the name “Research excellence has no gender”. The event aimed to draw attention to the existing disparities in science and the need to develop and introduce changes to reduce these disparities.

Authors and Affiliations

Marta Gmurek

1 2

Anna Kłos

1 3

Jacek Ł. Kolanowski

1 4

Akademia Młodych Uczonych PAN
Politechnika Łódzka
Wojskowa Akademia Techniczna
Instytut Chemii Bioorganicznej PAN

1

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