检索结果-南通市图书馆

Journal of Central South University 2015年第9期22卷 3302-3310页

作者： Jagannath Pal Satadal Ghorai Bikash Nandi Tapas chakraborty Goutam Das T.Venugopalan CSIR-National Metallurgical Laboratory Tata Steel

Pelletization of hematite ore requires high fineness and very high induration temperature（~1325 ℃） owing to its poor diffusion bonding unlike magnetite ore. Further, high-alumina hematite pellets show very high reduction degradation index（RDI） during low temperature（500-650 ℃） reduction due to their volume expansion and lattice distortion. Noamundi（India） hematite ore contains very high Al2O3（2.3%） with adverse ratio of alumina to silica（~2） for which, it shows very high RDI. In this work, the acid pellets prepared from Noamundi ore fines of optimum Blaine fineness show good cold crushing strength（CCS）. However, it shows very high RDI（77%）. In order to reduce RDI, Mg O in form of two different gangue-containing fluxes, such as pyroxenite and olivine in varying quantities has been added. The optimum requirement and performance of these fluxes has been examined and compared. Both pyroxenite and olivine fluxed pellets show significant lowering of RDI（26% and 23%, respectively） and improvement of other properties, viz CCS, swelling indices etc with good reducibility（70%-77%）. Finally, a good quality acidic hematite pellet was developed from high-alumina ore without using any lime which is very important charge material in combination of basic sinter in blast furnace.

关键词： hematite pellet high-alumina ore reduction degradation index(RDI) pyroxenite flux olivine flux effect of MgO

Tuned reactive power dispatch through modified differential evolution technique

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2012年第2期6卷 138-147页

作者： S.BISWAS(RAHA) N.chakraborty Department of Power Engineering Jadavpur UniversitySaltlake 2nd CampusKolkata 700098India

This paper explores the capability of modified differential evolution （MDE） technique for solving the reactive power dispatch （RPD） problem. The proposed method is based on the basic differential evolution （DE） technique with a few modifications made into it. DE is one of the strongest optimization techniques though it suffers from the problem of slow convergence while global minima appear. The proposed modifications ate tried to resolve the problem. The RPD problem mainly defines loss minimization with stable voltage profile. To solve the RPD problem, the generator bus voltage, transformer tap setting and shunt capacitor placements are controlled by the MDE approach. In this paper, IEEE 14-bus and IEEE 30-bus systems are chosen for MDE implementation. The applied modification show much improved result in comparison to normal DE technique. Comparative study with other softcomputing technique including DE validates the effectiveness of the proposed method.

关键词： reactive power dispatch (RPD) modified differential evolution (MDE) differential evolution algorithm with localizations around the best vector (DELB)

Plant Remains from an Archaeological Site as Indicators of Vegetation and Agricultural Practice Between(3 320±400) and(2 080±80) yr BP in Gangetic West Bengal,India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2006年第6期48卷 628-641页

作者： Ruby Ghosh Subir Bera Ashalata D'Rozario Manju Banerjee Supriyo chakraborty Department of Botany University of Calcutta 35 Ballygunge Circular RoadKolkata 700019India Narasinha Dutt College 129 Bellilious Road Howrah 711101India Radiocarbon Dating Laboratory Birbal Sahni Institute of Palaeobotany 53 University RoadLucknow 226007India

Diverse plant remains recovered from an archaeological site of Chslcollthlc-Early Historic age in the Bhalrabdanga area of Pakhanna （latitude 23°25′N, longitude 87°23′E）, situated on the west bank of the Damodar river, Bankura district, West Bengal, India, include food grains, wood charcoals, and palynomorphs. Radiocarbon dating of the recovered biological remains reveal the age of the site as （3 320 ± 400） to （2 080± 80） yr BP. The food grains were Identified as Oryza sativa L. and Vigna mungo L, and seeds of Brassica cf. campestris L. were also found; these indicate the agricultural practice and food habits of the ancient people living at Pakhanna from the Chalcolithlc to the Early Historic period. Sediments Including plant remains have been broadly divided into two zones, considering archaeological findings and radiocarbon dating. Analysis of the plant remains （I.e, wood charcoals and palynomorphs） in addition to cultivated food grains has revealed that a rich vegetation cover existed in this area, with a prevailing tropical and humid climate, comprising the timber-yielding plants Shores sp., Terminalia sp., and Tamarindus sp., with undergrowths of diverse shrubs and herbs during the Chalcolithic period （zone I） dated （3 320 ± 400） yr BP. Comparatively poorer representation and frequency of plant remains Indicate a drier climate during the Early Historic period （zone Ⅱ） dated as （2 110 ± 340） to （2 080 ± 80） yr BP. Comparisons of the archaeobotanical data recovered from the Chalcollthic and Early Historic period and also a principle components analysis Indicate a change In the climate of the area from tropical and humid at （3 320 ± 400） yr BP to tropical and drier conditions at （2 110 ± 340） to （2 080 ± 80） yr BP. The present-day tropical, dry deciduous vegetation of the area suggests that climate change has occurred in the area since the contemporaneous past. The plant remains database has been utilized to reconstruct the settlement pattern of the community livi

关键词： agriculture archaeological site culture, India Pakhanna, plant remains vegetation West Bengal.

Diabetes mellitus and COVID-19:Understanding the association in light of current evidence

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第28期9卷 8327-8339页

作者： Saikat Sen Raja chakraborty Pratap Kalita Manash Pratim Pathak Faculty of Pharmaceutical Science Assam down town UniversityGuwahati 781026AssamIndia Department of Pharmaceutical Technology School of Medical SciencesADAMAS UniversityKolkata 700126West BengalIndia Department of Pharmacy Pratiksha Institute of Pharmaceutical SciencesGuwahati 781026AssamIndia

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)infections have posed a problematic healthcare situation worldwide since December *** mellitus is associated with an increased risk and severity of coronavirus disease 2019(COVID-19).While interacting with various other risk factors,high blood sugar was found to reduce immunity and increase the replication of SARS�*** stress and the release of pro-inflammatory cytokines are greater in diabetic individuals than in healthy people,worsening the outcome of SARS�CoV-2 infection in *** expression of furin and angiotensin converting enzyme 2(ACE-2)receptor in the hyperglycemic environment may promote the entry of SARS-CoV-2 in the host ***-19 infection primarily modulates immune and inflammatory responses,and may cause a cytokine storm,resulting in possible lethal outcomes in *** experimental report suggests that ACE expressed in the pancreas and the SARS-CoV-2 virus invariably destroyβ-cells which contain ACE-2 receptors and results in acute ***,COVID-19 also causes hyperglycemia in an individual with diabetes which may be related to insulin resistance and destruction ofβ-cells during SARS-CoV-2 *** observations also suggest a correlation between oral hypoglycemic agents and the risk of *** review focused on the possible cause and mechanism involved in SARS-CoV-2 infection in diabetics and the role of antidiabetic drugs in COVID-19.

关键词： Diabetes mellitus SARS-CoV-2 COVID-19 Angiotensin converting enzyme

Integrating QoS Management in TLMM:Three Level Mobility Model for Next Generation Wireless IP-Based Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2008年第3期5卷 125-139页

作者： M.chakraborty I.S.Misra A.Mukherjee Department of Information Technology Institute of Engineering & Management Department of Electronics and Telecommunication Engineering Jadavpur University IBM Global Services

In this paper we have designed an implemented an integrated framework of QoS for Three Level Mobility Model(TLMM),which has been recently proved to be the optimal mobility management solution for next generation wireless IP-based *** QoS solution uses a combination of IntServ and DiffServ models incorporated in TLMM *** paper also proposes an effi cient dynamic handover policy that takes care of false *** and analytical results have shown that this infrastructure guarantees eff icient QoS handling and scalability among end *** provide a comparative understanding of the QoS mechanism and signaling load of TLMM we have used TeleMIP(without QoS support) and MIP as alternative mobility management protocols.

关键词： Qos NGN wireless IP network

Investigation on the Trap Signature in Organic Semiconductor Turmeric Film Through Current-Voltage Analysis

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2020年第4期26卷 265-272页

作者： Kushal chakraborty Aloke Kumar Das Ratan Mandal Dulal Krishna Mandal Department of Physics Jadavpur UniversityKolkata 700032India School of Energy Studies Jadavpur UniversityKolkata 700032India Department of Mechanical Engineering Jadavpur UniversityKolkata 700032India

The analytical description of the trap signature in the charge conduction process of turmeric dye-based organic semiconductor has been presented in this *** analytical explanation of the built-in potential Ⅴx-Ⅴ graph that emphasizes the presence of trapping states has been *** analysis of current-voltage(Ⅰ-Ⅴ)characteristics has also been conducted to verify the trap signature of the carrier in the *** non-monotonous decrement of the G(Ⅴ)-Ⅴ plot verifies the trap *** values of trap energy(Et)and trap factor(θ)have been derived from the logarithmic Ⅰ-Ⅴ *** the analysis of the semilogarithmic Ⅰ-Ⅴ plot,the barrier height(ϕbi)of the device has also been *** overallⅠ-Ⅴcurve has been taken into account to examine the Richardson-Schottky and Poole-Frenkel effects on the trap-assisted charge conduction *** the results of the experiment,the Schottky effect has been observed to be effective,which leads to a bulk-limited charge conduction process.

关键词： Organic semiconductor Trap energy Trap factor Turmeric Schottky effect

Entropy analysis of unsteady magneto-nanofluid flow past accelerating stretching sheet with convective boundary condition

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2015年第12期36卷 1593-1610页

作者： S.DAS S.chakraborty R.N.JANA O.D.MAKINDE Department of Mathematics University of Gour Banga Department of Applied Mathematics Vidyasagar University Faculty of Military Science Stellenbosch University

The unsteady laminar magnetohydrodynamics （MHD） boundary layer flow and heat transfer of nanofluids over an accelerating convectively heated stretching sheet are numerically studied in the presence of a transverse magnetic field with heat source/sink The unsteady governing equations are solved by a shooting method with the Runge-Kutta- Fehlberg scheme. Three different types of water based nanofluids, containing copper, aluminium oxide, and titanium dioxide, are taken into consideration. The effects of the pertinent parameters on the fluid velocity, the temperature, the entropy generation num- ber, the Bejan number, the shear stress, and the heat transfer rate at the sheet surface are graphically and quantitatively discussed in detail. A comparison of the entropy generation due to the heat transfer and the fluid friction is made with the help of the Bejan number. It is observed that the presence of the metallic nanoparticles creates more entropy in the nanofluid flow than in the regular fluid flow.

关键词： unsteady MHD flow nanofluid heat source/sink entropy generation Bejan number

Phosphoinositides in plant-pathogen interaction:trends and perspectives

在线全文

学校读者我要写书评

暂无评论

Stress Biology 2023年第1期3卷 52-68页

作者： Fauzia Zarreen Kamal Kumar Supriya chakraborty Molecular Virology Laboratory School of Life ScienceJawaharlal Nehru UniversityNew Delhi 110067India

Phosphoinositides are important regulatory membrane lipids,with a role in plant development and cellular *** evidence indicates that phosphoinositides play crucial roles in plant defence and are also utilized by pathogens for *** this review,we highlight the role of phosphoinositides in plant-pathogen interaction and the implication of this remarkable convergence in the battle against plant diseases.

关键词： Plant virus Kinases Phosphoinositides Phosphatidylinositol Plant-pathogen Signalling

Assessing forest fragmentation in north-western Himalaya:a case study from Ranikhet forest range,Uttarakhand,India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2017年第2期28卷 319-327页

作者： Mohit Sharma Anusheema chakraborty J.K.Garg P.K.Joshi University School of Environment Management Guru Gobind Singh Indraprastha University Department of Natural Resources TERI University School of Environmental Sciences Jawaharlal Nehru University

The northwestern Himalaya harbors high levels of biodiversity due to its unique topography, climatic conditions and heterogeneity. Forest fragmentation is one of the major threats causing a decline in biodiversity in the Himalayan region. We assesses forest fragmentation and changes in land use land cover（LULC） patterns using multi-temporal satellite data over a time span of four decades（1976–2013）. Fragmentation analysis using the Landscape Fragmentation Tool（LFT） reveals a decrease in core and edge areas by 14 and 2.3 %, respectively; while an increase in non-forest, patch area and perforation area by 2.1, 0.4, and 14 %, respectively. The LULC dynamics show that the areas under dense forest and scrub forest have decreased by 2.8 % and 1.9 %, respectively; and there is an increase in open forest, crop land and fallow land area by 2.6, 1.7 and 2.1 %, respectively. The quantification of landscape heterogeneity is undertaken with the help of landscape metrics computed using FRAGSTATS at class and landscape level, showing signs of increased fragmentation. Our study provides baseline database that can support the future biodiversity conservation and sustainable forest management initiatives.

关键词： fragmentation landscape patch biodiversity heterogeneity Himalayan climatic FRAGSTATS showing northwestern

Constriction factor based particle swarm optimization for analyzing tuned reactive power dispatch

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2013年第2期7卷 174-181页

作者： Syamasree BISWAS(RAHA) Kamal Krishna MANDAL Niladri chakraborty Department of Power Engineering Jadavpur University Kolkata700098 India

The reactive power dispatch （RPD） problem is a very critical optimization problem of power system which minimizes the real power loss of the transmission system. While solving the said problem, generator bus voltages and transformer tap settings are kept within a stable operating limit. In connection with the RPD problem, solving reactive power is compensated by incorporating shunt capacitors. The particle swarm optimization （PSO） technique is a swarm intelligence based fast working optimization method which is chosen in this paper as an optimization tool. Additionally, the constriction factor is included with the conventional PSO technique to accelerate the convergence property of the applied optimization tool. In this paper, the RPD problem is solved in the case of the two higher bus systems, i.e., the IEEE 57-bus system and the IEEE ll8-bus system. Furthermore, the result of the present paper is compared with a few optimization technique based results to substantiate the effectiveness of the proposed study.

关键词： real power loss minimization voltage stability constriction factor particle swarm optimization (PSO)