http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Empirical Tests of New Growth Theory : Openness and Growth
Sengupta, Jati K. 세종대학교 국제경제연구소 1994 Journal of Economic Integration Vol.9 No.3
New growth theory has stressed the role of export externality and increasing returns to scale in promoting sustained growth. This paper discusses these sources of economic growth in Asian NICs(newly industrializing countries) in recent times by applying some modern econometric tests based on cointegration and other methods. Countries such as Japan, Korea and Taiwan are considered as examples for empirical applications of the broad tenets of the new growth theory.
EXISTENCE OF A PRODUCT SUB MANIFOLD OF AN LP-SASAKIAN MANIFOLD WITH A COEFFICIENT α
Sengupta, A.K.,De, U.C.,Jun, J.B. Korean Mathematical Society 2003 대한수학회보 Vol.40 No.4
In this paper, we have proved that there exists a product submanifold of an LP-Sasakian manifold with a coefficient a and the manifold and its product sub manifold possess a CR-structure respectively.
Effects of Rapid Thermal Annealing Temperature on Performances of Nanoscale FinFETs
Sengupta, M.,Chattopadhyay, S.,Maiti, C.K. The Institute of Electronics and Information Engin 2009 Journal of semiconductor technology and science Vol.9 No.4
In the present work three dimensional process and device simulations were employed to study the performance variations with RTA. It is observed that with the increase in RTA temperature, the arsenic dopants from the source /drain region diffuse laterally under the spacer region and simultaneously acceptors (Boron) are redistributed from the central axis region of the fin towards the Si/SiO2 interface. As a consequence both drive current and peak cut-off frequency of an n-FinFET are observed to improve with RTA temperatures. Volume inversion and hence the flow of carries through the central axis region of the fin due to reduced scattering was found behind the performance improvements with increasing RTA temperature.
A Concise Synthesis of Mupirocin H Using a Cross‐Metathesis‐Based Strategy
Sengupta, Sandip,Sim, Taebo WILEY‐VCH Verlag 2014 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.2014 No.23
<P><B>Abstract</B></P><P>A highly efficient (10.1 % overall yield) and convergent (longest linear sequence of 16 steps) synthesis of mupirocin H has been achieved, starting from commercially available (+)‐(<I>R</I>)‐Roche ester. The route relies on an efficient Grubbs cross‐metathesis reaction to generate a key, late‐stage <I>E</I>‐olefin intermediate, and a cobalt‐catalysed diastereoselective Reformatsky reaction to produce a β‐hydroxy ester that serves as a late‐stage intermediate.</P>
Structural Revision of Baulamycin A and Structure–Activity Relationships of Baulamycin A Derivatives
Sengupta, Sandip,Bae, Munhyung,Oh, Dong-Chan,Dash, Uttam,Kim, Hak Joong,Song, Woon Young,Shin, Injae,Sim, Taebo American Chemical Society 2017 Journal of organic chemistry Vol.82 No.24
<P>Total synthesis of the proposed structure of baulamycin A was performed. The spectral properties of the synthetic compound differ from those reported for the natural product. On the basis of comprehensive NMR study, we proposed two other possible structures for natural baulamycin A. Total syntheses of these two substances were performed, which enabled assignment of the correct structure of baulamycin A. Key features of the convergent and fully stereocontrolled route include Evans Aldol and Brown allylation reactions to construct the left fragment, a prolinol amide-derived alkylation/desymmetrization to install the methyl-substituted centers in the right fragment, and finally, a Carreira alkynylation to join both fragments. In addition, we have determined the inhibitory activities of novel baulamycin A derivatives against the enzyme SbnE. This SAR study provides useful insight into the design of novel SbnE inhibitors that overcome the drug resistance of pathogens, which cause life-threatening infections.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/joceah/2017/joceah.2017.82.issue-24/acs.joc.7b01719/production/images/medium/jo-2017-017198_0020.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jo7b01719'>ACS Electronic Supporting Info</A></P>
Arp 65 interaction debris: massive H I displacement and star formation
Sengupta, C.,Scott, T. C.,Paudel, S.,Saikia, D. J.,Dwarakanath, K. S.,Sohn, B. W. EDP Sciences 2015 Astronomy and astrophysics Vol.584 No.-
<P>Context. Pre?merger tidal interactions between pairs of galaxies are known to induce significant changes in the morphologies and kinematics of the stellar and interstellar medium components. Large amounts of gas and stars are often found to be disturbed or displaced as tidal debris. This debris then evolves, sometimes forming stars and occasionally forming tidal dwarf galaxies. Here we present results from our HI study of Arp 65, an interacting pair hosting extended HI tidal debris. Aims. In an effort to understand the evolution of tidal debris produced by interacting pairs of galaxies, including in situ star and tidal dwarf galaxy formation, we are mapping HI in a sample of interacting galaxy pairs. The Arp 65 pair is the latest member of this sample to be mapped. Methods. Our resolved HI 21 cm line survey is being carried out using the Giant Metrewave Radio Telescope. We used our HI survey data as well as available SDSS optical, Spitzer infra-red and GALEX UV data to study the evolution of the tidal debris and the correlation of HI with the star-forming regions within it. Results. In Arp 65 we see a high impact pre?merger tidal interaction involving a pair of massive galaxies (NGC90 and NGC93) that have a stellar mass ratio of ~1:3. The interaction, which probably occurred ~1.02.5 × 10<SUP>8</SUP> yr ago, appears to have displaced a large fraction of the HI in NGC90 (including the highest column density HI) beyond its optical disk. We also find extended on-going star formation in the outer disk of NGC90. In the major star-forming regions, we find the HI column densities to be ~4.7 × 10<SUP>20</SUP> cm<SUP>−2</SUP> or lower. But no signature of star formation was found in the highest column density HI debris SE of NGC90. This indicates conditions within the highest density HI debris remain hostile to star formation and it reaffirms that high HI column densities may be a necessary but not sufficient criterion for star formation.</P>
Highly stereoselective synthesis of mupirocin H
Sengupta, S.,Kim, H.J.,Cho, K.S.,Song, W.Y.,Sim, T. Pergamon Press 2017 Tetrahedron Vol.73 No.8
A highly diastereoselective and efficient convergent synthesis of mupirocin H starting from (+)-®-Roche ester was achieved. Grubbs cross metathesis was employed as the key step in the pathway to generate an important E-olefin intermediate. Other processes utilized in the route include a Pd-catalysed stereoselective substitution reaction of a cis epoxide, Sharpless epoxidation followed by Red-Al promoted epoxide ring opening, and Seebach methylation and a TEMPO/BAIB mediated oxidation-lactonization sequence. Finally, we observed that mupirocin H inhibits SbnE, a synthetase required for staphyloferrin B biosynthesis.
Investigations of H-Darrieus rotors for different blade parameters at low wind speeds
Sengupta, Anal R.,Biswas, Agnimitra,Gupta, Rajat Techno-Press 2017 Wind and Structures, An International Journal (WAS Vol.25 No.6
Studies of unsymmetrical blade H-Darrieus rotors at low wind speeds in terms of starting time, static torque, and power performances for different blade parameters: thickness-to-chord (t/c), camber position, and solidity are scarce. However these are required for knowing insights of rotor performances to obtain some design guidelines for the selection of these rotors. Here, an attempt is made to quantify the effects of these blade parameters on the performances of three different H-Darrieus rotors at various low wind streams. Different blade profiles, namely S815, EN0005 (both unsymmetrical), and NACA 0018 (symmetrical blade for comparison) are considered. The rotors are investigated rigorously in a centrifugal blower apparatus. Firstly the dynamic and static performances of the rotors are evaluated to determine the best performing rotor and their optimum solidity. Generalised performance equations are developed based on selected blade parameters which are validated for the unsymmetrical rotors. Further, the starting time is quantified with respect to the rotor inertia to determine the suitable range of inertia that helps the unsymmetrical blade rotor to self-start earlier than the symmetrical one. This study can work as a benchmark for the selection of optimum blade parameters while designing an unsymmetrical blade rotor at low wind speeds.