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Solid Phase Anaerobic Bioremediation of Soil from the "Tomb" Area Contaminated with Chlorinated Pesticides

Archives of Environmental Protection | 2009 | vol.35 | No 3 | 123-133

Keywords DDT mcihoxychlor soil bioremediation y-HCH

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Abstract

The paper presents results or laboratory tests or solid-phase anaerobic biorerncdiation or soil contaminated with chlorinated pesticides. It was shown that using methanogcnic granular sludge as inoculum and lactate as electron donor, it is possible to remove 80% or y-HCH, 94% 01· methoxychlor and 93% or DDT against control sample, with DDD accumulation much less than stoichiometric. Pesticides removal was practically completed alter 4-6 weeks of incubation at 22°C. Additional application of nonionic surfactant Tween 80 resulted in about one and a half-fold decrease or residual concentrations or some corn pounds. It also enhanced DDT conversion to some extent, decreasing DDD accumulation and intensifying production of D8P, the terminal metabolite or DDT anaerobic degradation pathway. Use of methanol as electron donor produced effects quite similar to these obtained with lactate, however with reduced results scatter.

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Authors and Affiliations

Tomasz Baczyński

Yeshayahu Leibowitz: Kant, Judaism, humanism

Wojciech Kozyra

Przegląd Filozoficzny. Nowa Seria | 2019 | No 2 | 115-123 | DOI: 10.24425/pfns.2019.128379

Keywords Y. Leibowitz I. Kant humanism Judaism law

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Abstract

The article presents a critical analysis of Yeshayahu Leibowitz’s thesis that Judaism and Kant’s practical philosophy represent antagonistic tendencies of thought. This opposition, according to Leibowitz, consists in the claim that Kantian ethics sees the supreme value in human being, while in Judaism such a view can amount only to a usurpation of God’s sovereignty by man. The aim of the article is to show that after an investigation into its substance, Kant’s moral theory turns out to resemble in the essential respects Leibowitz’s view concerning Judaism.

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Authors and Affiliations

Wojciech Kozyra

Measurements of the Methane Concentration Along the Longwall Excavations and Longwall

Piotr Ostrogórski Przemysław Skotniczny Mieczysław Pucka

Archives of Mining Sciences | 2022 | vol. 67 | No 1 | 195-204 | DOI: 10.24425/ams.2022.140861

Keywords measurements of the methane concentration section measurements Y system individual methane meters inspection and monitoring mining data fusion

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Abstract

One of the most hazardous places in mines are longwall areas. They emit a considerable amount of methane to the ventilation air. The emission depends on many but mostly known factors. The article presents the research results on changes in the methane concentration along the longwall excavations and longwall. The distributions were obtained based on a measurement experiment at the ZG Brzeszcze mine in Poland. The author’s research aimed to experimentally determine the concentration of methane as a function of the length of excavation for the longwall excavations and longwall. As a result, methane concentration trends along the excavations were obtained. The conclusions show the pros and cons of the method used, and it allows to set the right direction in the development of measurement systems and sensors.

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Bibliography

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[4] L . Liao, G. Lou, M. Chen, An Integrated RFID and Sensor System for Emergency Handling in Underground Coal Mines Environments. In J. Zheng, S. Mao, S.F. Midkiff, H. Zhu, (Eds.); Ad Hoc Networks, Springer Berlin Heidelberg 28, 818-824 (2010). DOI : https://doi.org/10.1007/978-3-642-11723-7_56 [5] F . Ma, Sensor Networks-Based Monitoring and Fuzzy Information Fusion System for Underground Gas Disaster. In Proceedings of the 2012 9th International Conference on Fuzzy Systems and Knowledge Discovery, 596-600 (2012).
[6] M .A. Moridi, M. Sharifzadeh, Y. Kawamura, H.D. Jang, Development of Wireless Sensor Networks for Underground Communication and Monitoring Systems (the Cases of Underground Mine Environments). Tunneling and Underground Space Technology 73, 127-138 (2018). DOI : https://doi.org/10.1016/j.tust.2017.12.015
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Authors and Affiliations

Piotr Ostrogórski

1

e-mail:

ORCID:

Przemysław Skotniczny

1

e-mail:

ORCID:

Mieczysław Pucka

2

Strata Mechanics Institute, Polish Academy of Sciences, 27 Reymonta Str., 30-059 Kraków, Poland
Tauron Wydobycie S.A. ZG Brzeszcze, ul. Kościuszki 1, 32-620 Brzeszcze, Poland

Long-term Annealing of NiCrAlY LENS Coating on 316L Steel

K.K. Szymański

Archives of Foundry Engineering | 2022 | vol. 22 | No 4 | 116-120 | DOI: 10.24425/afe.2022.143959

Keywords NiCrAlY LENS Additive manufacturing Long-term annealing Microstructural stability

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Abstract

This article presents the results of a research on the behavior of NiCrAlY coating obtained by the LENS method on austenitic stainless steel type 316L under long-term annealing conditions at 1000°C for 25, 100 and 250 hours. The morphology of the NiCrAlY layer as a function of annealing time and temperature was characterized. The chemical composition and distribution of alloying elements were eval-uated using scanning microscopy and micro-area chemical composition analysis. It was revealed that NiCrAlY coatings deposited by LENS method are characterized by good metallurgical quality. The long-term annealing of the NiCrAlY coating led to microstructural changes in the form of the disappearance of the original dendritic structure and the formation of a solid solution of nickel with chromium and a small amount of aluminum, as well as chromium α-Cr precipitates and Ni-Y-type phases. The effect of increasing iron concentration in the coating due to diffusion-to-core processes was also found

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Bibliography

[1] Zhu, C., Javed, A., Li, P., Liang, Y. & Xiao, P. (2013). Study of the effect of laser treatment on the initial oxidation behaviour of Al-coated NiCrAlY bond-coat. Surfaces and Interface Analysis. 45(11-12), 1680-1689. DOI: 10.1002/sia.5307.
[2] Taylor, M.P. & Evans, H.E. (2003). Formation of diffusion cells in LPPS MCrAlY coatings. Materials at High Temperature. 20(4), 461-465. DOI: 10.1179/mht.2003.053.
[3] Nijdam, T., Jeurgens, L. & Sloof, W. (2005). Promoting exclusive α-Al2O3 growth upon high-temperature oxidation of NiCrAl alloys: experiment versus model predictions. Acta Materialia. 53(6), 1643-1653. DOI: 10.1016/j.actamat.2004.12.014.
[4] Choi, H., Yoon, B., Kim, H. & Lee, C. (2002). Isothermal oxidation of air plasma spray NiCrAlY bond coatings. Surface & Coatings Technology. 150(2-3), 297-308. DOI: 10.1016/S0257-8972(01)01557-2.
[5] Zhu, C., Li, P., Javed, A., Liang, G.Y. & Xiao, P. (2012). An investigation on the microstructure and oxidation behavior of laser remelted air plasma sprayed thermal barrier coatings. Surfaces and Coatings Technology 206(18), 3739-3746. DOI: 10.1016/j.surfcoat.2012.03.026.
[6] Ghasemi, R., Razavi, R.S., Mozafarinia, R., Jamali, H., Oghaz, M.H. & Pidani, R.A. (2014). The influence of laser treatment on hot corrosion behavior of plasma-sprayed nanostructured yttria stabilized zirconia thermal barrier coatings. Journal of European Ceramic Society. 34(8), 2013-2021. DOI: 10.1016/j.jeurceramsoc.2014.01.031.
[7] Nowotny, S., Berger, L.-M. & Spatzier, J. (2014). Coatings by laser cladding. Comprehensive hard materials. Editors: V.K. Sarin. Elsevier. 507-525. DOI: 10.1016/B978-0-08-096527-7.00018-0.
[8] Moskal, G., Niemiec, D., Chmiela, B., Kałamarz, P., Durejko, T., Ziętala, M. & Czujko, T. (2020). Microstructural characterization of laser-cladded NiCrAlY coatings on Inconel 625 Ni-based superalloy and 316L stainless steel. Surface & Coatings Technology 387, 125317. DOI: 10.1016/j.surfcoat.- 2019.125317.
[9] Ma, K. Tang, F., & Schoenung, J.M. (2010). Investigation into the effects of Fe additions on the equilibrium phase compositions, phase fractions and phase stabilities in the Ni-Cr-Al system. Acta Materialia. 58(5), 1518-1529. DOI: 10.1016/j.actamat.2009.10.059.
[10] Zhang, P., Li, X., Moverare, J. & Peng, R. (2019). The iron effect on oxidation and interdiffusion behaviour in MCrAlX coated Ni-base superalloys. Materials & Design. 166(15), 107599. DOI: 10.1016/j.matdes.2019.107599.

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Authors and Affiliations

K.K. Szymański

1

e-mail:

ORCID:

Silesian Technical University of Technology, Faculty of Materials Science and Engineering, Department of Metallurgy and Recycling, ul. Krasińskiego 8, 40-019 Katowice, Poland

Influence of annealing conditions on changes of the structure and selected properties of Al88Y7Fe5 and Al88Y6Fe6 alloys

Rafał Babilas Monika Spilka Wojciech Łoński Adrian Radoń Mariola Kądziołka-Gaweł Piotr Gębara

Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 2 | e144614 | DOI: 10.24425/bpasts.2023.144614

Keywords Al-Y-Fe metallic glasses heat treatment structural tests corrosion resistance magnetic properties

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Abstract

Al-Y-Fe amorphous and nanocrystalline alloys are characterized by a unique collection of diverse properties that are influenced by various factors, including heat treatment. In this paper, the effect of heat treatment on the structural changes and selected properties of Al-Y-Fe metallic glasses in the as-spun state is investigated. The structure of the Al88Y7Fe5 and Al88Y6Fe6 alloys was examined by X-ray diffraction (XRD) and Mössbauer spectroscopy (MS). The corrosion resistance of the samples was characterized using polarization tests in a 3.5% NaCl solution at 25 °C. The effect of sodium chloride on the surface was studied with scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The magnetic properties of Al-based alloys were explored using a vibrating sample magnetometer (VSM). It was revealed that the tested alloys show better properties after annealing than in the as-spun state. The annealing of the Al88Y7Fe5 and Al88Y6Fe6 alloys in the temperature range of 200 to 300 °C improved the magnetic properties and corrosion resistance of these materials. After 3,600 s, the better EOCP values were recorded for the Al88Y6Fe6 and Al88Y7Fe5 alloys after annealing at 300 °C and 200 °C, adequately. On the basis of the polarization tests, it was concluded that the electrochemical properties are better for Al88Y6Fe6 alloys after annealing at 300 °C.

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Authors and Affiliations

Rafał Babilas

1

e-mail:

ORCID:

Monika Spilka

1

e-mail:

ORCID:

Wojciech Łoński

1

Adrian Radoń

2

Mariola Kądziołka-Gaweł

3

Piotr Gębara

4

Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
Łukasiewicz Research Network, Institute of Non-Ferrous Metals, Sowinskiego 5, 44-100 Gliwice, Poland
Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
Department of Physics, Czestochowa University of Technology, Armii Krajowej 19, 42-200 Czestochowa, Poland

Bearing capacity and seismic performance of Y-shaped reinforced concrete bridge piers in a freeze-thaw environment

Yanfeng Li Jialong Li Tianyu Guo Tongfeng Zhao Longsheng Bao Xinglong Sun

Archives of Civil Engineering | 2023 | vol. 69 | No 1 | 367-384 | DOI: 10.24425/ace.2023.144178

Keywords freeze-thaw cycle Y-shaped bridge pier finite element analysis bearing capacity seismic resistance

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Abstract

A quantitative study is performed to determine the performance degradation of Y-shaped reinforced concrete bridge piers owing to long-term freeze-thaw damage. The piers are discretized into spatial solid elements using the ANSYS Workbench finite element analysis software, and a spatial model is established. The analysis addresses the mechanical performance of the piers under monotonic loading, and their seismic performance under low-cycle repeated loading. The influence of the number of freeze-thaw cycles, axial compression ratio, and loading direction on the pier bearing capacity index and seismic performance index is investigated. The results show that freeze-thaw damage has an adverse effect on the ultimate bearing capacity and seismic performance of Y-shaped bridge piers in the transverse and longitudinal directions. The pier peak load and displacement ductility coefficient decrease with increasing number of freeze-thaw cycles. The axial compression ratio is an important factor that affects the pier ultimate bearing capacity and seismic performance. Upon increasing the axial compression ratio, the pier peak load increases and the displacement ductility coefficient decreases, the effects of which are more significant in the longitudinal direction.

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Authors and Affiliations

Yanfeng Li

1

e-mail:

ORCID:

Jialong Li

1

Tianyu Guo

1

e-mail:

ORCID:

Tongfeng Zhao

2

Longsheng Bao

3

e-mail:

ORCID:

Xinglong Sun

1

School of Transportation and Geomatics Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Liaoning Provincial College of Communications, Liaoning Bridge Safety Engineering Research Center, Shenyang 110168, China
School of Transportation Engineering, Shenyang Jianzhu University, Shenyang 110168, China

Homogeneous Dispersion of Yttrium Oxide Particles in Nickel-Based Superalloy by High Pressure Homogenizing and Ball Milling Method

Jongmin Byun Young-In Lee Sung-Tag Oh

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1055-1058 | DOI: 10.24425/amm.2021.136424

Keywords Ni-based superalloy Y2O3 dispersion High pressure homogenizer spark plasma sintering microstructure

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Abstract

An optimum route to fabricate the Ni-based superalloy with homogeneous dispersion of Y2O3 particles is investigated. Ni-based ODS powder was prepared by high-energy ball milling of gas-atomized alloy powders and Y2O3 particles treated with a high-pressure homogenizer. Decrease in particle size and improvement of dispersion stability were observed by high-pressure homogenization of as-received Y2O3 particles, presumably by the powerful cavitation forces and by collisions of the particles. Microstructural analysis for the ball-milled powder mixtures reveal that Ni-based ODS powders prepared from high-pressure homogenization of Y2O3 particles exhibited more fine and uniform distribution of Ni and Y elements compared to the as-received powder. These results suggested that high-pressure homogenization process is useful for producing Ni-based superalloy with homogeneously dispersed oxide particles.

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Bibliography

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[15] C. Suryanarayana, Prog. Mater. Sci. 46, 1 (2001).

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Authors and Affiliations

Jongmin Byun

1

e-mail:

ORCID:

Young-In Lee

1

e-mail:

ORCID:

Sung-Tag Oh

1

e-mail:

ORCID:

Seoul National University of Science and Technology, Department of Materials Science and Engineering & The Institute of Powder Technology, Seoul 01811, Republic of Korea

Synthesis of Y2O3-Dispersed W Powders Prepared by Ultrasonic Spray Pyrolysis and Polymer Solution Route

Hyeonhui Jo Young-In Lee Myung-Jin Suk Young-Keun Jeong Sung-Tag Oh

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 799-802 | DOI: 10.24425/amm.2021.136383

Keywords Tungsten Y2O3 dispersion Ultrasonic spray pyrolysis Wet chemical route

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Abstract

The nano-sized Y2O3 dispersed W composite powder is prepared by ultrasonic spray pyrolysis of a tungsten precursor using ammonium metatungstate hydrate and a polymer addition solution method using Y-nitrate. XRD analysis for calcined powder showed the formation of WO2 phase by partial oxidation of W powder during calcination in air. The TEM and phase analysis for further hydrogen reduction of calcined powder mixture exhibited that the W powder with a uniform distribution of Y2O3 nanoparticles can be successfully produced. These results indicate that the wet chemical method combined with spray pyrolysis and polymer solution is a promising way to synthesis the W-based composites with homogeneous dispersion of fine oxide particles.

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Bibliography

[1] W.D. Klopp, J. Less-Common Met. 42, 261 (1975).
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[9] S.C. Cifuentes, M.A. Monge, P. Pérez, Corros. Sci. 57, 114 (2012).

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Authors and Affiliations

Hyeonhui Jo

1

Young-In Lee

1 2

e-mail:

ORCID:

Myung-Jin Suk

3

Young-Keun Jeong

4

e-mail:

ORCID:

Sung-Tag Oh

1 2

e-mail:

ORCID:

Seoul National University of Science and Technology, Department of Materials Science and Engineering, Seoul 01811, Republic of Korea
Seoul National University of Science and Technology, The Institute of Powder Technology, Seoul 01811, Republic of Korea
Kangwon National University, Department of Materials Science and Engineering, Samcheok 25913, Republic of Korea
Pusan National University, Graduate School of Convergence Science, Busan 46241, Republic of Korea

Synthesis and Characterization of W Composite Powder with La ₂O ₃-Y ₂O ₃ Nano-Dispersoids by Ultrasonic Spray Pyrolysis

Youn Ji Heo Eui Seon Lee Jeong Hyun Kim Young-In Lee Young-Keun Jeong Sung-Tag Oh

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 4 | 1507-1510 | DOI: 10.24425/amm.2022.141083

Keywords W composite powder La2O3-Y2O3 dispersion Ultrasonic spray pyrolysis Polymeric additive solution method

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Abstract

An optimum route to synthesis the W-based composite powders with homogeneous dispersion of oxide nanoparticles was investigated. The La2O3 dispersed W powder was synthesized by ultrasonic spray pyrolysis using ammonium metatungstate hydrate and lanthanum nitrate. The dispersion of Y2O3 nanoparticles in W- La2O3 powder was carried out by a polymer addition solution method using yttrium nitrate. XPS and TEM analyses for the composite powder showed that the nano-sized La2O3 and Y2O3 particles were well distributed in W powder. This study suggests that the combination processing of ultrasonic spray pyrolysis and polymeric additive solution is a promising way to synthesis W-based composite powders.

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Authors and Affiliations

Youn Ji Heo

1 2

e-mail:

ORCID:

Eui Seon Lee

1

e-mail:

ORCID:

Jeong Hyun Kim

1

e-mail:

ORCID:

Young-In Lee

1 2

e-mail:

ORCID:

Young-Keun Jeong

3

e-mail:

ORCID:

Sung-Tag Oh

1 2

e-mail:

ORCID:

Seoul National University of Science and Technology, Department of Materials Science and Engineering, Seoul 01811, Republic of Korea
Seoul National University of Science and Technology, The Institute of Powder Technology, Seoul 01811, Republic of Korea
Pusan National University, Graduate School of Convergence Science, Busan 46241, Republic of Korea

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Solid Phase Anaerobic Bioremediation of Soil from the "Tomb" Area Contaminated with Chlorinated Pesticides

Abstract

Authors and Affiliations

Yeshayahu Leibowitz: Kant, Judaism, humanism

Abstract

Authors and Affiliations

Measurements of the Methane Concentration Along the Longwall Excavations and Longwall

Abstract

Bibliography

Authors and Affiliations

Long-term Annealing of NiCrAlY LENS Coating on 316L Steel

Abstract

Bibliography

Authors and Affiliations

Influence of annealing conditions on changes of the structure and selected properties of Al88Y7Fe5 and Al88Y6Fe6 alloys

Abstract

Authors and Affiliations

Bearing capacity and seismic performance of Y-shaped reinforced concrete bridge piers in a freeze-thaw environment

Abstract

Authors and Affiliations

Homogeneous Dispersion of Yttrium Oxide Particles in Nickel-Based Superalloy by High Pressure Homogenizing and Ball Milling Method

Abstract

Bibliography

Authors and Affiliations

Synthesis of Y2O3-Dispersed W Powders Prepared by Ultrasonic Spray Pyrolysis and Polymer Solution Route

Abstract

Bibliography

Authors and Affiliations

Synthesis and Characterization of W Composite Powder with La ₂O ₃-Y ₂O ₃ Nano-Dispersoids by Ultrasonic Spray Pyrolysis

Abstract

Authors and Affiliations