检索结果-南通市图书馆

Magnetic and flotation studies of b.nded hematite quartzite (b.Q) ore for the production of pellet grade concentrate

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 675-682页

作者： b. das b.K.Mishra S. Prakash S.K.das P.S.R.Reddy S.I.Angadi Institute of Minerals and Materials Technology Council of Scientific & Industrial Research (CSIR)

To identify and estab.ish b.neficiation techniques for b.nded hematite quartzite （b.Q） iron ore, a comprehensive research on b.Q ore treatment was carried out. The b.Q ore was assayed as 38.9wt% Fe, 42.5wt% SiO2, and 1.0wt% Al2O3. In this ore, hematite and quartz are present as the major mineral phases where goethite, martite, and magnetite are present in small amounts. The lib.ration of hematite particles can b. enhanced to ab.ut 82% b. reducing the particle size to b.low 63 μm. The rejection of silica particles can b. ob.ained b. magnetic and flotation separation techniques. Overall, the b.Q ore can b. enriched to 65.3wt% Fe at 61.9% iron recovery. A flowsheet has b.en suggested for the commercial exploitation of the b.Q ore.

关键词： hematite b.neficiation magnetic separation flotation pelletizing

Major　ion　chemistry　and　control　of　weathering　of　b.imtal　Lake，Humaun　Himalaya，India

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 1996年第3期8卷 367-377页

作者： Manpreet Singh b. K. das (Centre of Advanced Study in Geology), Panjab.University, Chandigarh-160 014, India Centre of Advanced Study in Geology Panjab University Chandigarh-160 014 India

The water chemistry of b.imtal Lake revealed the dominance of Ca￣(2+) and HCO_3￣- *** lake water chemistry is controlled b. the dominance of Ca-Mg silicate weathering(mainly pumpellyite and epidote-b.aring rocks) supported b. anthropogenic activity involving extensive road cutting and house holding activities, increased industrialization in the catchment area of the lake. On the b.sis of phosphate values. a transitional mesotrophic-eutrophic conditions exist in this *** ob.erved chemical data of the b.imtal Lake was used to predict the mineral assemb.ages in the carb.nate and alumino-silicate system. It demonstrates that the calcite and dolomite are the possib.e minerals which are in equilib.ium with the lake water system and that the lake water is in the range of stab.lity of kaolinite.

关键词： b.itmal anthropogenic carb.n dioxide pressure photosynthesis silicate weathering.

b.ulder-induced form roughness and skin shear stresses in a gravel-b.d stream

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第1期21卷 346-360页

作者： das Ratul DATTA Akash Civil Engineering Department National Institute of Technology AgartalaAgartala-799046India

b.ulder spacing in mountain rivers and near-wake flow zones within the b.ulder array is very useful for fish hab.tat and growth of aquatic *** present study aims to investigate how the b.ulder array and spacing influence the near-b.d flow structures in a gravel-b.d *** are staggered over a gravel-b.d stream with three different inter-b.ulder spacing namely(a)large(b.medium and(c)small *** acoustic Doppler velocimeter was used for flow measurements in a rectangular channel and the results were compared with those acquired from numerical *** time-averaged velocity profiles at the near-wake flow zones of b.ulders experience maximum flow retardation which is an outcome of the b.ulder-induced form *** ratio of velocity differences associated to form and skin roughness and its positive magnitude reveals the dominance of form roughness closest to the *** roughness computed is 1.75 to 2 times higher than the skin roughness at the near-wake flow *** particular,the collective immob.le b.ulders placed at different inter-b.ulder spacings developed high and low b.d shear stresses closest to the *** low b.d shear stresses characterised b. a secondary peak developed at the trough location of the b.ulders is attrib.ted to the skin shear ***,the spatial averaging of time-averaged flow quantities gives additional impetus to present an improved illustration of fluid shear *** formation of form-induced shear stress is estimated to b. 17%to 23%of doub.eaveraged Reynolds shear stress and partially compensates for the damping of time-averaged Reynolds shear stress in the interfacial *** quadrant analysis of spatial velocity fluctuations depicts that the form-induced shear stresses are dominant in the interfacial sub.layer and have no significance ab.ve the gravel-b.d surface.

关键词： Array of b.ulders Near wake flow zones Velocity distrib.tions Skin roughness Form induced shear stresses

Evaluation of Type of Nephropathy in Patients of Type-2 Diab.tes Mellitus

在线全文

学校读者我要写书评

暂无评论

Journal of Diab.tes Mellitus 2017年第4期7卷 281-293页

作者： S. Nayak S. K. Tripathy S. das b. P. das C. R. Kar Department of Medicine SCB Medical College Cuttack India Department of Pathology SCB Medical College Cuttack India Department of Nephrology SCB Medical College Cuttack India

b.ckground of the Study, Aims and Ob.ectives: There are very few studies on histological patterns of diab.tic nephropathy in our part of country. The aim of this study was to evaluate the renal involvement in patients with Type-2 diab.tes mellitus (T2DM), assess the histopathological changes and estab.ish a clinico-pathological correlation. Sub.ects, Method and Materials: Thirty two Type 2 DM patients with nephropathy, after screening consecutive hundred(100) Type 2 Diab.tics admitted to the Medicine Department were evaluated for renal involvement b. kidney b.opsy and histopathological study. Statistical analysis was done b. student’s t-test, chi-square and linear regression analysis. Results: Thirty two patients (32) with diab.tic nephropathy (20 males and 12 females) formed the study group out of hundred (100) consecutive Type-2 diab.tes mellitus patients (58 males and 42 females) admitted to Medicine Department of SCb.Medical College Hospital, Cuttack. The frequency of occurrence of clinical diab.tic nephropathy was 32%. Most of the patients were having duration of DM of 6-10 years (87.5%). Pedal edema was found in 96.87%, hypertension in 87.5% patients respectively. Regression analysis showed that durations of DM and Hb.1c were the two significant risk factors (P Histopathologically, diffuse glomerulosclerosis was the most common form of renal ab.ormality found in 93.75% followed b. nodular glomerulosclerosis in 62.50% with overlap in many patients, memb.anous nephropathy in 12.5% and focal necrotising glomerulonephritis in 6.25% respectively. There was no statistically significant clinicopathological correlation ob.erved b.tween clinical and b.ochemical parameters in patients harb.uring the two predominant histological types of nephropathy i.e. diffuse and nodular glomerulosclerosis with respect to age, sex, duration of diab.tes, b.dy mass index, systolic b.ood pressure, Hb.1c, 24 hour urinary protein, creatinine clearance, serum urea, serum creatinine or lipid

关键词： Type 2 DM Diab.tic Nephropathy Renal b.opsy Diffuse Glomerulosclerosis Nodular Glomerulosclerosis

Improvement of Plasma Performance with Lithium Wall Conditioning in Aditya Tokamak

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第2期15卷 123-128页

作者： M. b. CHOWDHURI R. MANCHANDA J. GHOSH S. b. b.ATT Ajai KUMAR b. K. das K. A. JADEJA P. A. RAIJADA Manoj KUMAR S. b.NERJEE Nilam RAMAIYA Aniruddh MALI Ketan M. PATEL Vinay KUMAR P. VASU R. b.ATTACHARYAY R. L. TANNA Y. Shankara JOISA P. K. ATREY C. V. S. RAO D. Chenna REDDY P. K. CHATTOPADHYAY R. JHA Y. C. SAXENA Aditya team Institute for Plasma Research Bhat Gandhinagar 382 428 India

Lithiumization of the vacuum vessel wall of the Aditya tokamak using a lithium rod exposed to glow discharge cleaning plasma has b.en done to understand its effect on plasma performance. After the Li-coating, an increment of ~100 eV in plasma electron temperature has b.en ob.erved in most of the discharges compared to discharges without Li coating, and the shot reproducib.lity is considerab.y improved. Detailed studies of impurity b.haviour and hydrogen recycling are made in the Li coated discharges b. ob.erving spectral lines of hydrogen, carb.n, and oxygen in the visib.e region using optical fib.r, an interference filter, and PMT b.sed systems. A large reduction in O I signal （up to ~40% to 50%） and a 20% to 30% decrease of Ha signal indicate significant reduction of wall recycling. Furthermore, VUV emissions from O V and Fe XV monitored b. a grazing incidence monochromator also show the reduction. Lower Fe XV emission indicates the declined impurity penetration to the core plasma in the Li coated discharges. Significant increase of the particle and energy confinement times and the reduction of Zeff of the plasma certainly indicate the improved plasma parameters in the Aditya tokamak after lithium wall conditioning.

关键词： lithiumization wall conditioning impurity Aditya tokamak

An advantageous charging/discharging scheduling of electric vehicles in a PV energy enhanced power distrib.tion grid

在线全文

学校读者我要写书评

暂无评论

Green Energy and Intelligent Transportation 2024年第2期3卷 60-78页

作者： Pritam das Partha Kayal Department of Electrical Engineering National Institute of Technology SilcharAssam788010India

Electric vehicles(EVs)are going to overrule the transportation sector due to their pollution-free technology and low running ***,charging the EVs causes significant power demand and stress on the power delivery *** challenge can b. tackled well when charging and discharging scheduling are coordinated with intelligent EV *** this work,two-stage charging and discharging scheduling are *** the first stage,a time scheduling algorithm is structured to identify EV charging/discharging slots at different hours,and at a later stage,the slots are optimally distrib.ted among different charging *** of the EVs towards the EVCSs has b.en designed to enhance the useful participation of the EVs in the charging and discharging *** this regard,a possib.e numb.r of EVs in the test region has b.en forecasted with a regression *** adequacy of the comb.ned charging-discharging and location scheduling model is tested on a typical PV-enhanced 28-b.s Indian distrib.tion *** case studies containing three sub.cases in each have b.en performed incorporating the choice of the EV owners towards charging and discharging in different time slots in a *** case studies have resulted in a peak-to-average ratio(PAR)of 1.151,0,1.165,0,1.196,8,1.165,0,1.180,9,1.196,8,1.196,8,1.196,8 and 1.196,8 for the 24-h demand pattern in Case-1a,Case-1b.Case-1c,Case-2a,Case-2b.Case-2c,Case-3a,Case-3b.and Case-1c respectively in comparison to a PAR of 1.2 for the 24-h demand in b.se case.

关键词： Charging-discharging scheduling Electric vehicles Solar irradiance forecasting Optimization Distrib.tion network

EVOLUTION AND INTERACTION OFδ-WAVES IN THE ZERO-PRESSURE GAS DYNAMICS SYSTEM

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2024年第5期44卷 1801-1836页

作者： Ab.ishek das K.T.JOSEPH Centre for Data Science Institute of Technical Education and Research(ITER)Siksha‘O’Anusandhan(Deemed to be University)BhubaneswarOdisha751030India Centre for Applicab.e Mathematics Tata Institute of Fundamental ResearchSharada NagarBangalore560065KarnatakaIndia

Evolution and interaction of plane waves of the multidimensional zero-pressure gas dynamics system leads to the study of the corresponding one dimensional *** this paper,we study the initial value prob.em for one dimensional zero-pressure gas dynamics *** the first equation is the b.rgers equation and the second one is the continuity *** consider the solution with initial data in the space of b.unded b.rel *** we prove a general existence result in the algeb.a of generalized functions of *** we study in detail special solutions withδ-measures as initial *** study interaction of waves originating from initial data concentrated on two point sources and interaction with classical shock/rarefaction *** gives an understanding of plane-wave interactions in the multidimensional *** use the vanishing viscosity method in our analysis as this gives the physical solution.

关键词： zero-pressure gas dynamics delta-waves interaction of waves

Effect of in ovo feeding of xylob.ose and xylotriose on plasma immunoglob.lin, cecal metab.lites production, microb.al ecology, and metab.lic pathways in b.oiler chickens

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and b.otechnology 2024年第4期15卷 1578-1589页

作者： Razib.das Pravin Mishra b.rendra Mishra Rajesh Jha Department of Human Nutrition Food and Animal SciencesCollege of Tropical Agriculture and Human ResourcesUniversity of Hawaii at ManoaHonoluluHI 96822USA

b.ckground Dietary supplementation of xylooligosac charides(XOS) has b.en found to influence gut health b. manipulating cecal microb.ota and producing microb.-origin *** no study investigated and compared the effect of in ovo feeding of xylob.ose(XOS2) and xy lotriose(XOS3) in *** study investigated the effect of in ovo feeding of these XOS compounds on post-hatch gut health parameters in chickens.A total of 144 fertilized chicken eggs were divided into three groups:a) non-injected control(CON),b. XOS2,and c) *** the 17^(th) emb.yonic day,the eggs of the XOS2 and XOS3 groups were injected with 3 mg of XOS2 and XOS3 diluted in 0.5 mL of 0.85% normal saline through the amniotic *** hatching,the chicks were raised for 21 *** was collected on d 14 to measure plasma *** digests were collected for measuring short-chain fatty acids(SCFA) on d 14 and 21,and for microb.al ecology and microb.al metab.lic pathway analyses on d 7 and *** The results were considered significantly different at Pb.t significant differences on d ***;the SCFA concentrations were lower in the XOS3 than in the CON group on d *** cecal metagenomics data showed that the ab.ndance of the family Clostridiaceae significantly decreased on d 7,and the ab.ndance of the family Oscillospiraceae increased on d 21 in the XOS2 compared to the *** was a reduction in the relative ab.ndance of genus Clostridium sense stricto 1 in the XOS2 compared to the CON on d 7 and the genus Ruminococcus,torques in b.th XOS2 and XOS3 groups compared to the CON on d *** XOS2 and XOS3 groups reduced the genes for chondroitin sulfate degradation Ⅰ and L-histidine degradation Ⅰpathways,which contrib.te to improved gut health,respectivelyc in the micr

关键词： b.oiler In ovo Metagenomics Preb.otic Xylooligosaccharides

Hyb.id ion/electron interfacial regulation stab.lizes the cob.lt/oxygen redox of ultrahigh-voltage lithium cob.lt oxide for fast-charging cyclab.lity

在线全文

学校读者我要写书评

暂无评论

Science b.lletin 2024年第13期69卷 2071-2079页

作者： Zhihong b. Anping Zhang Gongrui Wang Cong Dong Pratteek das Xiaoyu Shi Zhong-Shuai Wu State Key Lab.ratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Dalian National Lab.ratory of Clean Energy Chinese Academy of SciencesDalian 116023China

High-voltage and fast-charging LiCoO_(2)(LCO)is key to high-energy/power-density Li-ion ***,unstab.e surface structure and unfavorab.e electronic/ionic conductivity severely hinder its high-voltage fast-charging ***,we construct a Li/Na-b.Mg-Si-O-F-rich mixed ion/electron interface network on the 4.65 V LCO electrode to enhance its rate capab.lity and long-term cycling ***,the resulting artificial hyb.id conductive network enhances the reversib.e conversion of Co^(3+)/^(4+)/O_(2)/nredox b. the interfacial ion–electron cooperation and suppresses interface side reactions,inducing an ultrathin yet compact cathode electrolyte ***,the derived near-surface Na+/Mg2+/Si^(4+)-pillared local intercalation structure greatly promotes the Li^(+)diffusion around the 4.55 V phase transition and stab.lizes the cathode ***,excellent 3 C(1 C=274 mA g1)fast charging performance is demonstrated with 73.8%capacity retention over 1000 *** findings shed new insights to the fundamental mechanism of interfacial ion/electron synergy in stab.lizing and enhancing fast-charging cathode materials.

关键词： High-voltage Fast-charging LiCoO_(2) Interfacial ion-electron cooperation Local intercalation