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Wyszukujesz frazę "B -metal" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Jan Czochralski – historia człowieka niezwykłego
Jan Czochralski – the history of an extraordinary man
Autorzy:
TOMASZEWSKI, Paweł E.
Powiązania:
https://bibliotekanauki.pl/articles/520304.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Umiejętności
Tematy:
Jan Czochralski
metoda Czochralskiego
metal B
mecenas kultury
poeta
pisarz
Czochralski method
B -metal
patron of culture
poet
novelist
Opis:
W artykule przedstawione zostały wybrane obrazki z życia i twórczości prof. Jana Czochralskiego (1885–1953), wybitnego polskiego chemika, metaloznawcy i krystalografa oraz mecenasa sztuki, poety i pisarza. Z bogatego dorobku naukowego naszkicowane zostały trzy najważniejsze jego osiągnięcia: radiomikroskop, który można uważać za pierwowzór skaningowego mikroskopu analizującego (SPM) nagrodzonego Nagrodą Nobla w 1986 r., stop do łożysk kolejowych znany jako „metal B”, który przyniósł Czochralskiemu sławę i bogactwo, oraz tz w. metoda Czochralskiego otrzymywania monokryształów, dzięki której nazwano uczonego „ojcem współczesnej elektroniki”. Nie bez znaczenia są inne jego wynalazki, takie jak płyn do trwałej ondulacji czy „proszek od kataru z Gołąbkiem”. Mimo takich osiągnięć, nazwisko Jana Czochralskiego było w Polsce objęte infamią za rzekomą kolaborację z Niemcami w czasie II wojny światowej. Jednak, po ostatecznym udowodnieniu wiosną 2011 roku faktu jego współpracy z Armią Krajową, przywrócono mu dobre imię na Politechnice Warszawskiej. Słusznie więc rok 2013 został przez Sejm RP ogłoszony Rokiem Jana Czochralskiego.
The presented paper is a report from a presentation delivered in December 2013, at the end of the “Year of Jan Czochralski” celebrated in Poland. For that reason the life and achievements of Prof. Jan Czochralski (1885–1953) were presented in a very short way. Jan Czochralski was a well known Polish chemist and metallurgist of the fi rst half of the 20th century working in Germany and Poland. His achievements were numerous and only three were presented in a more detailed way. The fi rst was a “radiomicroscope” for examination of the surface of metallic samples, which may be regarded as a prototype of modern scanning probe microscope (SPM) awarded with the Nobel Prize in 1986. The second achievement made Czochralski a famous scientist and a rich man prior to WWII – this was a special alloy for railway sliding bearing shells called “B -metal”. The third discovery gave the world recognition to Jan Czochralski after the war – this was the so -called “Czochralski method” for pulling a single crystal from the melt. Without this method used to obtain single silicon crystals necessary to modern electronics, our contemporary civilization would not have been possible. Among his other achievements it is worth mentioning a development of a type of hair perm lotion and a powder against nasal infections, as well as his activities as a patron of culture, poet and novelist. Despite these achievements, the name of Jan Czochralski was a subject of infamy in Poland, for his alleged collaboration with the Germans during World War II. After he fi nally had given proof to his patriotic cooperation with the Home Army (Armia Krajowa), he regained his good name in the spring of 2011. Therefore, the year 2013 was rightly declared by the Parliament of the Republic of Poland as the “Year of Jan Czochralski”.
Źródło:
Prace Komisji Historii Nauki PAU; 2014, 13; 57-72
1731-6715
Pojawia się w:
Prace Komisji Historii Nauki PAU
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the Performance of Mg/Cr LDH by Forming Metal Oxides Mg/Cr-Ni Using Coprecipitation Method as Adsorbent for Cationic Dyes
Autorzy:
Yuliasari, Nova
Badri, Arini Fousty
Siregar, Patimah Mega Syah Bahar Nur
Palapa, Neza Rahayu
Mardiyanto
Mohadi, Risfidian
Lesbani, Aldes
Powiązania:
https://bibliotekanauki.pl/articles/2105268.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorption
metal oxide
rhodamine B
methylene blue
regeneration
Opis:
This study aimed to determine the adsorption capacity of rhodamine-B (Rh-B) and methylene blue (MB) on Mg/Cr-Ni adsorbents. The Mg/Cr-Ni adsorbent was synthesized by the coprecipitation method. The results of the characterization of Mg/Cr-Ni using XRD analysis showed the formation of oxides at an angle of 2θ = 31.726°, 33°, and 45.44°. The surface area of Mg/Cr-Ni is 23.139 m2/g. The adsorption capacity test for Mg/Cr-Ni for Rh-B and MB were 85.470 mg/g and 166.667 mg/g, respectively. The adsorption kinetics model followed the pseudo second order (PSO). The adsorption process is endothermic and occurs spontaneously at any temperature. Mg/CrNi showed stability in the adsorption process of Rh-B and MB for 5 regeneration cycles.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 67--74
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal responsive transcription factor 1 (MTF-1) regulates zinc dependent cellular processes at the molecular level
Autorzy:
Grzywacz, Agata
Gdula-Argasińska, Joanna
Muszyńska, Bożena
Tyszka-Czochara, Małgorzata
Librowski, Tadeusz
Opoka, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1038990.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
metal responsive-transcription factor 1
cell signaling
inflammation
NF-κB
Opis:
Metal responsive transcription factor 1 (MTF-1) is a zinc dependent transcription factor which is involved in the regulation of intracellular signaling pathways. MTF-1 regulates the expression of two streams of genes functioning in metal homeostasis and anti-oxidative response. MTF-1 acts in the process of binding of toxic metal ions in the cell, due to the activation of the expression of metallothioneins (MTs). Additionally, MTF-1 regulates transcription of genes involved in the sequestration of zinc and its intracellular transport. Disruption of zinc and MT homeostasis has an indispensable influence on the development of several pathological states. Moreover, by increasing MT activity, MTF-1 can effectively protect cells from oxidative and hypoxic stresses. The mechanism of MTF-1 action in cells includes the regulation of the proper immune response through activation/repression of anti- and pro-inflammatory cytokines. MTF-1 function in immune response is related to nuclear factor-κB (NF-κB) activity. Synthesis of insulin is also related to the activity of this transcription factor and zinc balance. Insulin transport also depends on zinc. In pancreatic β-cells, several types of the zinc transporters are found. Zinc transporters coordinated action is crucial for the synthesis and secretion of insulin. Disturbances in the regulation of signaling pathways connected with MTF-1 function can entail further alterations in zinc intracellular status and this growing imbalance can promote the pathophysiology of degenerative disorders.
Źródło:
Acta Biochimica Polonica; 2015, 62, 3; 491-498
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation and modelling of hot forming B₄C/AA6061 low volume fraction reinforcement composites
Autorzy:
Zheng, K.
Lin, J.
Wu, G.
Hall, R. W.
Dean, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/280433.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Metal Matrix Composite (MMC)
hot compression
AA6061
B₄C
dislocation
Opis:
This paper presents an experimental investigation of the hot deformation behaviour of 15% B₄C particle reinforced AA6061 matrix composites and the establishment of a novel corresponding unified and physically-based visco-plastic material model. The feasibility of hot forming of a metal matrix composite (MMC) with a low volume fraction reinforcement has been assessed by performing hot compression tests at different temperatures and strain rates. Examination of the obtained stress-strain relationships revealed the correlation between temperature and strain hardening extent. Forming at elevated temperatures enables obvious strain rate hardening and reasonably high ductility of the MMC. The developed unified material model includes evolution of dislocations resulting from plastic deformation, recovery and punching effect due to differential thermal expansion between matrix and reinforcement particles during non-steady state heating and plastic straining. Good agreement has been obtained between experimental and computed results. The proposed material model contributes greatly to a more thorough understanding of flow stress behaviour and microstructural evolution during the hot forming of MMCs.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 2; 457-469
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Mg Ratio on the Extraction of Dy from (Nd,Dy)-Fe-B Permanent Magnet Using Liquid Mg
Autorzy:
Park, Sang-Min
Nam, Sun-Woo
Cho, Ju-Young
Lee, Sang-Hoon
Hyun, Seung-Keun
Kim, Taek-Soo
Powiązania:
https://bibliotekanauki.pl/articles/353657.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dysprosium
liquid metal extraction
(Nd,Dy)-Fe-B magnet
extraction behavior
diffusion
Opis:
Recently, since the demand of rare earth permanent magnet for high temperature applications such as an electric motor has increased, dysprosium (Dy), a heavy rare earth element, is becoming important due to severe bias in its production. To fulfillthe increasing need of Dy, recycling offers as a promising alternative. In recycling of rare earths, Hydro-metallurgical extraction method is mainly used however it has adverse environmental effects. Liquid metal extraction on the other hand, is an eco-friendly and simple method as far as the reduction of rare earth metal oxide is concerned. Therefore, liquid metal extraction was studied in this research as an alternative to the hydro-metallurgical recycling method. Magnesium (Mg) is selected as solvent metal because it doesn’t form intermetallic compounds with Fe, B and has a low melting and low boiling point. Extraction behavior of Dy in (Nd,Dy)-Fe-B magnet is observed and effect of Mg ratio on extraction of Dy is confirmed.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1281-1285
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Compression Properties of Fe-Cr-B Alloy Manufactured using Laser Metal Deposition
Autorzy:
Joo, Y.-A.
Yoon, T.-S.
Park, S.-H.
Lee, K.-A.
Powiązania:
https://bibliotekanauki.pl/articles/352075.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fe-Cr-B composite
laser Metal Deposition
bulk type
microstructure
compressive properties
Opis:
Fe-Cr-B alloy is a material with precipitation of boride inside Fe matrix, and it features outstanding hardness and wear resistance properties. However, Fe-Cr-B alloy is a difficult material to process, making it difficult to use as a bulk type structure material which requires delicate shapes. This study attempted to manufacture Fe-Cr-B alloy using a 3D printing process, laser metal deposition. This study also investigated the microstructure, hardness and compression properties of the manufactured alloy. Phase analysis results is confirmed that α-Fe phase as matrix and (Cr, Fe)2B phase as reinforcement phase. In the case of (Cr, Fe)2B phase, differences were observed according to the sample location. While long, coarse, unidirectional needle-type boride phases (~11 μm thickness) were observed in the center area of the sample, relatively finer boride phases (~6 μm thickness) in random directions were observed in other areas. At room temperature compression test results confirmed that the sample had a compression strength is approximately 2.1 GPa, proving that the sample is a material with extremely high strength. Observation of the compression fracture surface identified intergranular fractures in areas with needle-type boride, and transgranular fractures in areas with random borides. Based on this results, this study also reviewed the deformation behavior of LMD Fe-Cr-B alloy in relation to its microstructures.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1459-1462
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friction Stir Welding of thin Sheets of Magnesium Alloy AZ31B
Autorzy:
Myśliwiec, P.
Śliwa, R. E.
Powiązania:
https://bibliotekanauki.pl/articles/352295.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FSW welding
magnesium alloys AZ31B
thin sheet
joining of metal sheets
Opis:
Friction stir welding developed in early 90’s is a refreshing approach to the joining of different kinds of metals. FSW has become increasingly popular and provides excellent alternative to conventional welding or riveting sheets of various metals. The paper present the results of research work on linear FSW joining magnesium alloys AZ31B of 0.5 mm in thickness. The study was conducted on properly adapted numerical controlled 3 axis milling machine using a own made tools and fastening device. The tool dimensions have been estimated in accordance with the algorithm shown in the literature [2]. All joints were made of end-to end (butt) configuration under different process parameters. The effect of selected technological parameters on the quality of the joint was analyzed. Produced butt joint have been subjected to a static tensile testing to identify mechanical features of the materials of joints compared to parent materials. Measurements of micro hardness HV in the plastically formed stir zone of joint and in the parent material have been carried out. Axial and radial welding forces in the joining region were recorded during the tests and their dependency from the welding parameters was studied . Based on results of strength tests the efficiency of joints for sheets of 0.5 mm in thicknesses oscillated up to 90% compared to the parent material. It has been found that for given parameters the correct, free of defects joints were obtained. The results suggests that FSW can be potentially applied to magnesium alloys.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 45-54
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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