http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jung, D.,Balamurugan, J.,Kim, N.H.,Lee, S.H.,Bhattacharyya, D.,Lee, J.H. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.109 No.-
<P>The catalytic activity and durability are important factors to the commercial deployment of proton exchange membrane fuel cells (PEMFCs). Recent observations offer that carbon-based support materials can significantly improve the catalytic activity, durability and long-term stability. Here, we report a new strategy for the fabrication of Pt nanoparticles (NPs) supported 3D graphene nanosheets (Pt/3D-GNS) hybrid architecture using polyvinylpyrrolidone-Nafion complex (PNC) to boost the catalytic properties in PEMFCs. The 3D hybrids nanostructure are characterized by FE-SEM, TEM, XRD, Raman and XPS analysis. FE-SEM and TEM analysis reveal that the as-synthesized Pt/3D-GNS were of high quality and well ordered similar to 5-7 nm Pt NPs particles uniformly dispersed on 3D graphene nanosheets. Impressively, Pt/3D-GNS exhibited excellent catalytic activity, outstanding durability and long-term stability than that of commercial electrode material (Pt/C). The improvement in extraordinary electrochemical performance can be endorsed to the unique morphology, high porosity, excellent conductive networks, and intense networking of Pt NPs and 3D graphene sheets in the hybrid matrix. These findings open a new path way to designate the Pt/3D-GNS hybrids as promising low-cost, highly catalytic active, durable and long-cycle life electrode materials for the development of high performance PEMFCs. (C) 2016 Elsevier Ltd. All rights reserved.</P>
ION IRRADLATION STUDIES OC CARGON FILMS PREPARED BY PLASMA ASSISTED CVD METHOD
Bhattacharyya, Bhattacharyya, Somnath-,Sayeed, Ahmed,Kanjilal, Kanjilal, D.,Subramanyam, S.V 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.3
Amorphous hydrogeneted carbon films were prepared by plasma assisted cvd metnod and their dc conductivity as studied as a function of temperature in the range of 300K to 10K. Films were then subjected to high energy(170MeV)$I^{+13}$ ion irradiation. After irradiation an marked change was observed in the conductivity and its temperature dependenc. The conductivity decreased by 2 to 3 orders of magnitude, room temperature activation energy increased and a gap appeared in the electronic structure. Photo-emission spectropic study on the material show a decrease in the $\pi$ states of the electronic density of states spectrum from UPS and a noticible change in the Cls peak shape in XPS.
Primate Model for the Evaluation of Vaginal Contraceptives
Zoneveld, L.J.D.,Bhattacharyya, A.K.,Kim, D-S,Schumacher, G.F.B.,Beluhan, Z. The Korean Society for Reproductive Medicine 1979 Clinical and Experimental Reproductive Medicine Vol.6 No.1
A good animal model that simulates the human subject has not been available for the evaluation of the in vivo effectiveness of vaginal contraceptives. After careful consideration, The stumptailed macaque (Macaca arctoides) was studied for its applicability since it has a reproductive tract similar to that of the woman, is easy to handle, does not require tranquilization or anesthesia when the contraceptive is deposited, and breeds and conceives readily under caged conditions. The reported observations show the usefulness of this animal. Both postcoital sperm motility studies and breeding experiments were performed with the use of Delfen vaginal cream and K-Y jelly. K-Y jelly had no effect on the motility of vaginal spermatozoa or on the conception rate of the primates. Although Delfen vaginal cream consistently immobilized all spermatozoa in the postcoital test, half of the animals became pregnant within an average of 3.7 breeding cycles. These results illustrate the discrepancy between spermicidal tests and fertility measurements, and it is recommended that primate-breeding experiments be performed before a spermicide is evaluated in women as a contraceptive. (AM J. OBSTET. GYNECOL, 129:368, 1977.)
Hadoop based Weblog Analysis : A Review
Pooja D. Savant,Debnath Bhattacharyya,Tai-hoon Kim 보안공학연구지원센터 2016 International Journal of Software Engineering and Vol.10 No.6
The growth of websites and the Internet has opened up new research, social, entertainment, education and business opportunities. With the fast growth of the Internet, the digital data generated by the websites is becoming so massive that the traditional text software and relational database technology faces a bottleneck while processing such massive data and the results generated by these technologies are not satisfactory. Cloud computing offers a good solution for this problem. Cloud computing is not only capable of storing such massive data but also capable of processing and analyzing such voluminous data faster, by making use of distributed storage and distributed computing technology. A weblog is a group of connected web pages that consists of a log or daily record of information, particular fields or views which is altered, every now and then, by owner of site, other websites or by website users. An enterprise weblog analysis system based on Hadoop architecture with Hadoop Distributed File System (HDFS), Hadoop MapReduce Software Framework and Pig Latin Language aids the business decision-making process of the system administrators and helps them to collect and identify the potential value which is hidden within such huge data generated by the websites. Such a weblog analysis includes the analysis of an Internet site’s entry log as well as provides information about the amount of visitors, days of week and rush hours, views, hits, very often accessed pages, application server traffic trends, performance reports at varying intervals and statistical reports which indicate the performance of program.
Repeated dose toxicity of alfa-cypermethrin in rats
S Manna,D Bhattacharyya,TK Mandal,S Das 대한수의학회 2004 Journal of Veterinary Science Vol.5 No.3
The present study was performed to investigate the subacute effect of α-cypermethrin (α-CP) in rats. Alfacypermethrin a synthetic pyrethroid insecticide, dissolved in dimethyl sulfoxide (DMSO) and oral LD50 was investigated after administering orally different doses in rats and was determined as 145 mg/kg. Other groups of rats were given repeated daily oral dose (1/10 LD50) of α-CP for 30 days. The animals were sacrificed on 31st day. Activities of various enzymes, cytochrome P450 and b5 contents in liver, hepatic antioxidant status, tissue residue concentration, haemogram and pathological changes were studied. It increased the serum aminotransaminases (AST,ALT), alkaline phosphatase (ALP), lactate dehydrogenase (LDH) activities and blood glucose level significantly. α-CP decreased RBC count, PCV and Hb level significantly. It significantly decreased cytochrome P450 in liver. Residues were present in different tissues. It increased malondialdehyde (MDA) level, while decreased the activities of catalase (CAT), superoxide dismutase (SOD) and glycogen level in liver significantly. Mild to moderate histological alterations were observed in lungs, liver, stomach, kidneys, testes and cerebellum. So repeated daily oral doses of α-CP at 1/10LD50 altered the biochemical parameters, decreased cytochrome P450 content, antioxidant status, which correlated with histopathological changes of tissues.
Properties of nano-ZnO/poly(vinyl alcohol)/poly(ethylene oxide) composite thin films
J. Lee,D. Bhattacharyya,A.J. Easteal,J.B. Metson 한국물리학회 2008 Current Applied Physics Vol.8 No.1
A series of poly(vinyl alcohol)/nano-ZnO composites were prepared by dispersing nano-ZnO in aqueous solutions containing mixtures of the biodegradable polymers poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO), and composite thin films were prepared by casting. The introduction of nano-ZnO into PVA/PEO mixed solutions significantly decreased the resistivity of the solutions. Ultraviolet absorption, thermal behaviour and visco-elastic properties of the thin films were determined as a function of nano-ZnO content up to 15 wt%. Optimum film properties were obtained with 1 wt% nano-ZnO, higher proportions of nano-ZnO resulting in agglomeration of ZnO particles and deterioration in film properties. The Forouhi and Bloomer model was used for the modelling of ZnO thin films. A series of poly(vinyl alcohol)/nano-ZnO composites were prepared by dispersing nano-ZnO in aqueous solutions containing mixtures of the biodegradable polymers poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO), and composite thin films were prepared by casting. The introduction of nano-ZnO into PVA/PEO mixed solutions significantly decreased the resistivity of the solutions. Ultraviolet absorption, thermal behaviour and visco-elastic properties of the thin films were determined as a function of nano-ZnO content up to 15 wt%. Optimum film properties were obtained with 1 wt% nano-ZnO, higher proportions of nano-ZnO resulting in agglomeration of ZnO particles and deterioration in film properties. The Forouhi and Bloomer model was used for the modelling of ZnO thin films.