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Wyszukujesz frazę "Chanda, A." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
On Micromachining with a Focus on Miniature Gears by Non Conventional Processes. A Status Report
Autorzy:
Chaudhary, T.
Siddiquee, A. N.
Chanda, A. K.
Khan, Z. A.
Powiązania:
https://bibliotekanauki.pl/articles/139762.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wire electrical discharge machining
WEDM
electrochemical machining
ECM
micro-electrical discharge machining
micro-EDM
wycinanie elektroerozyjne
obróbka elektrochemiczna
mikroobróbka elektroerozyjna
mikro-EDM
Opis:
Recent developments in automation and technology have revolutionized the way products are made. It is directly seen in the evolution of part miniaturization in the sectors such as aerospace, electronics, biomedicine and medical implants. Micromachining is a promising technology to fulfill the need of miniaturization. A review has been done on the micromachining processes such as micro electric discharge machining (micro-EDM) and wire EDM (WEDM), micro electrochemical machining (micro-ECM). Recent literature were studied and categorized in terms of materials, process parameters, performances, product manufactured, and miniature product generation. Starting with brief introduction to micromachining, classifications and applications, technical aspects of discussions from the literature have been presented on key factors such as parameters and the response variables. Important aspects of recast layer, heat effected zone, micro-hardness, micro cracks, residual stress, etc., have been given. A special focus is given to the status of the research on microgear manufacturing. Comparison has been made between other conventional process suitable for micro-gear manufacturing and WEDM. The miniature gear machined by WEDM shows the defect-free microstructure, better surface finish, thin recast layer and improved gear quality parameters such as profile and pitch. Finally, the research gaps and future research directions have been presented.
Źródło:
Archive of Mechanical Engineering; 2018, LXV, 1; 129-169
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the Northern Bay of Bengal
Autorzy:
Das, S.
Das, I.
Giri, S.
Chanda, A.
Maity, S.
Lotliker, A.A.
Kumar, T.S.
Akhand, A.
Hazra, S.
Powiązania:
https://bibliotekanauki.pl/articles/48552.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
chromophoric dissolved organic matter
absorption coefficient
sea surface
salinity
chlorophyll a
total suspended matter
spatio-temporal variability
Bengal Bay
continental shelf
Opis:
The present paper dealt with the annual dynamics of the absorption coefficient of chromophoric dissolved organic matter at 440 nm {aCDOM(440)} during February 2015 to January 2016 in the continental shelf of northern Bay of Bengal (nBoB) for the first time. Sea surface salinity (SSS), chlorophyll-a (Chl-a), total suspended matter (TSM) were also analyzed. It was hypothesized that CDOM should exhibit significant spatial and temporal variability in this region. aCDOM(440) and spectral slope ranged between 0.1002 m1—0.6631 m1 and 0.0071 nm1— 0.0229 nm1 respectively during the entire study period. Higher values of aCDOM(440) were observed in the near shore stations and gradually decreased towards the offshore. Significant seasonal variability of aCDOM(440) was observed between the monsoon and non-monsoon seasons ( p < 0.05). Thus the framed hypothesis was successfully accepted by means of the present study. The CDOM was mainly found to be of allochthonous character in this region. aCDOM(440) portrayed a significant negative linear relationship with SSS (R2 = 0.80; p < 0.05) implying conservative mixing of marine and terrestrial end members. However, examining the spatial variability of the relationship, it was observed that this relationship was significant only in the nearshore stations. While examining the seasonal variability of this relationship, it was found to be most significant during the monsoon (R2 = 0.81; p < 0.05). Thus it was inferred that whenever the SSS gradient was higher, the relationship between aCDOM(440) and SSS was found to be most significant.
Źródło:
Oceanologia; 2017, 59, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, characterization and antimicrobial activity of some new dihydropyrano[c]chromenes
Autorzy:
Bhalu, A.
Moteriya, P.
Chanda, S.
Baluja, S.
Powiązania:
https://bibliotekanauki.pl/articles/412452.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dihydropyrano[c]chromenes
antibacterial activity
Gram positive bacteria
Gram negative bacteria
N,N-Dimethylformamide
Opis:
Some new dihydropyrano[c]chromenes derivatives are synthesized from 4-hydroxycoumarin. The structure of newly synthesized compounds was confirmed by mass, 1H NMR and IR spectroscopy. Further, antimicrobial screening of these synthesized compounds was done against some bacterial (Gram positive as well as Gram negative) and fungal strains in N,N-dimethylformamide. It is observed that some of synthesized compounds exhibited significant antibacterial activity against Gram positive bacterial strains. The selected fungal strains were most resistant for the studied compounds as none of the synthesized compounds showed activity against any of the fungal strain studied. The best antibacterial activity was shown by ABR-10.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 12; 1-6
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Co słychać u Chińczyków.
Autorzy:
Chanda, Nayan.
Leifer, Michael.
Austin, Greg.
Powiązania:
Dziś 1995, nr 10, s. 93-104
Współwytwórcy:
J.A. Tłumaczenie
Kelin, Vladimir Nikolaevič. Tłumaczenie
G.F. Tłumaczenie
Data publikacji:
1995
Tematy:
Obronność państwa Chiny 1995 r.
Bezpieczeństwo narodowe Chiny 1995 r.
Opis:
Tł. art. zamieszcz. w Far Eastern Economic Review. --- 1995, nr 15; Survey. --- 1995; The China Quarterly. --- 1995.
Dostawca treści:
Bibliografia CBW
Artykuł
    Wyświetlanie 1-4 z 4

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