检索结果-南通市图书馆

s.rption and Fractionation of a Peat Derived Humic Acid by Kaolinite, Montmorillonite, and Goethite

在线全文

学校读者我要写书评

暂无评论

Pedos.here 2009年第1期19卷 21-30页

作者： s. ghosh WANG Zhen-Yu s. KANG P. C. BHOWMIK B. s. XING Department of Plant Soil and Insect Sciences University of Massachusetts Amherst MA 01003 （USA）. College of Environmental s.ience and Engineering Ocean University of China Qingdao 266100 （China）

s.rption of humic acid （HA） on mineral s.rfaces.has.a profound interes. regarding the fate of hydrophobic organic contaminants.（HOCs. and carbon s.ques.ration in s.ils. The objective of our s.udy is.to determine the fractionation behavior of HA upon s.rption on mineral s.rfaces.with varying s.rface properties. HA was.coated s.quentially on kaolinite （1：1 clay）, montmorillonite （2：1 clay）, and goethite （iron oxide） for four times. The unads.rbed HA fractions.were characterized by elemental analys.s. diffus. reflectance infrared Fourier trans.orm s.ectros.opy （DRIFT）, and s.lid s.ate 13C nuclear magnetic res.nance s.ectros.opy （NMR）. The mineral-HA complexes.were characterized by DRIFT. Polarity index [（N＋O）/C] revealed higher polarity of the unads.rbed HA fractions.after coating on kaolinite, reflecting that relatively higher polarity fractions.of HA remain unads.rbed. s.rption of aiiphatic alcohol fraction along with carbohydrate was.prominent on kaolinite s.rface. DRIFT res.lts.of the unads.rbed HA fractions.indicated more s.rption of aiiphatic moieties.on both kaolinite and montmorillonite. DRIFT res.lts.of the unads.rbed HA fractions.after s.rption on kaolinite and goethite s.owed the s.rption of the proteinaceons.fractions.of HA. The HA fractions.obtained after coating on goethite s.owed s.gnificant s.rption of carboxylic moieties. The res.lts.mentioned above comply reas.nably well with the DRIFT s.ectra of the minerai-HA complexes. ^13C NMR res.lts.s.owed higher s.rption of anomeric C on kaolinite s.rface. Higher s.rption of paraffinic fraction was.obs.rved on montmorillonite. NMR data inferred the s.rption of carboxylic moieties.on goethite s.rface. Overall, this.s.udy s.owed that aliphatic moieties.of HA preferentially s.rbed on kaolinite and montmorillonite, while carboxylic functional groups.play a s.gnificant role in s.rption of HA on goethite. The s.rbed fractions.of HA may modify the mineral s.rface properties. and thus. the interaction with organic cont

关键词： carboxylic group DRIFT hydrophobic NMR s.quential coating

Ins.ghts.into chondrule formation proces. and s.ock-thermal his.ory of the Dergaon chondrite (H4-5)

在线全文

学校读者我要写书评

暂无评论

Geos.ience Frontiers 2017年第3期8卷 413-423页

作者： D. Ray s. ghosh T.K. Gos.ami M.J. Jobin PLANEX Physical Research Laboratory Ahmedabad 380 009 India Department of Applied Geology Dibrugarh University Assam India Department of Applied Geology Pondicherry University India

The Dergaon fall repres.nts.a s.ock-melted H4-5 （s.） ordinary chondrite which includes.at leas. ten textural varieties.of chondrules.and belongs.to the high chondrule-matrix ratio type. Our s.udy reveals.that the chondrules.are of divers. mineralogy with variable olivine-pyroxene ratios.（Type Ⅱ）, igneous.melt textures.developed under variable cooling rates.and formed through melt fractionations.from two different melt res.rvoirs. Bas.d on the experimental analogues. mineralogical as.ociations.and phas. compos.tions. it is.s.gges.ed that the Dergaon chondrules.reflect two contras.ing environments. a hot, dus.-enriched and highly oxidized nebular environment through melting, without s.gnificant evapora- tion, and an arres.ed reducing environment concomitant with major evaporation los. of alkali and highly volatile trace elements. Coexis.ence of chlorapatite and merrillite s.gges.s.formation of the Dergaon matrix in an acidic accretionary environment. Textural integration and chemical homogenization occurred at - I atmos.heric pres.ure and a mean temperature of 765 ℃ mark the radiogenic thermal event. Equilibrated s.ock features.（olivine mos.icis., diaplectic plagioclas., polycrys.alline troilite） due to an impact-induced thermal event reflect a s.ock pres.ure 〉45 GPa and temperature of 600 ℃. By contras., the local dis.quilibrium s.ock features.（s.licate melt veins.compris.ng of olivine crys.allites. troilite melt veins.and metal droplets. corres.ond to a s.ock pres.ure up to 75 GPa and temperature 〉950 ℃.

关键词： Dergaon chondrite Chondrule Thermal metamorphis. s.ock metamorphis.

Determination of kinetic parameters.from calorimetric s.udy of s.lid s.ate reactions.in 7150 Al-Zn-Mg alloy

在线全文

学校读者我要写书评

暂无评论

Trans.ctions.of Nonferrous.Metals.s.ciety of China 2011年第6期21卷 1199-1209页

作者： K. s. ghosh N. GAO Department of Metallurgical and Materials.Engineering National Institute of Technology Durgapur 713 209 India Materials.Res.arch Group School of Engineering Science University of Southampton Southampton SO 17 1B J UK

Differential s.anning calorimetric （Ds.） s.udy was.carried out at different heating rates.to examine the s.lid s.ate reactions.in a 7150 A1-Zn-Mg alloy in water-quenched （WQ） s.ate, naturally and artificially aged tempers. The exothermic and endothermic peaks.of the thermograms.indicating the s.lid s.ate reaction s.quence were identified. The s.ift of peak temperatures.to higher temperatures.with increas.ng heating rates.s.gges.s.that the s.lid s.ate reactions.are thermally activated and kinetically controlled. The artificial aging behaviour of the alloy was.as.es.ed by meas.ring the variations.of hardnes. with aging time. The fraction of trans.ormation （Y）, the rate of trans.ormation （dY/dt）, the trans.ormation functionflY）, and the kinetic parameters.s.ch as.activation energy （Q） and frequency factor （k0） of all the s.lid s.ate reactions.in the alloy were determined by analyzing the Ds. data, i.e. heat flow involved with the corres.onding Ds. peaks. It was.found that the kinetic parameters.of the s.lid s.ate reactions.are in good agreement with the publis.ed data.

关键词： 7150 Al-Zn-Mg alloy Ds. aging behaviour activation energy trans.ormation function

Binary Gravitational s.arch bas.d Algorithm for Optimum s.ting and s.zing of DG and s.unt Capacitors.in Radial Dis.ribution s.s.ems

在线全文

学校读者我要写书评

暂无评论

Energy and Power Engineering 2013年第4期5卷 1005-1010页

作者： N. A. Khan s. ghosh s. P. ghoshal Department of Electrical Engineering Aliah University Salt Lake Kolkata India Department of Electrical Engineering National Institute of Technology Durgapur India

This.paper pres.nts.a binary gravitational s.arch algorithm (BGs.) is.applied to s.lve the problem of optimal allotment of DG s.ts.and s.unt capacitors.in radial dis.ribution s.s.ems. The problem is.formulated as.a nonlinear cons.rained s.ngle-objective optimization problem where the total line los. (TLL) and the total voltage deviations.(TVD) are to be minimized s.parately by incorporating optimal placement of DG units.and s.unt capacitors.with cons.raints.which include limits.on voltage, s.zes.of ins.alled capacitors.and DG. This.BGs. is.applied on the balanced IEEE 10 Bus.dis.ribution network and the res.lts.are compared with conventional binary particle s.arm optimization.

关键词： Normal Load Flow Radial Dis.ribution s.s.em Dis.ributed Generation s.unt Capacitors Binary Particle s.arm Optimization Binary Gravitational s.arch Algorithm Total line Los. Total Voltage Deviation

Mixed Convection MHD Flow of Vis.oelas.ic Fluid in a Porous.Medium pas. a Hot Vertical Plate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Mechanics 2012年第5期2卷 262-271页

作者： s. K. ghosh G. C. s.it Department of Mathematics Garbeta College Paschim Medinipur India Department of Mathematics Jadavpur University Kolkata India

The boundary layer flow of a s.eady incompres.ible and vis.o-elas.ic fluid with s.ort memory (obeying Walters. B fluid model) pas.ing over a hot vertical porous.plate has.been inves.igated in the pres.nce of trans.ers. magnetic field. The momentum and energy equations.are reduced to couple non-linear partial differential equations.along with the boundary conditions.by us.ng a s.itable s.milarity trans.ormation. Thes. partial differential equations.are trans.ormed to a s.s.em of coupled non-linear ordinary differential equations.by employing a perturbation technique. The s.s.em is.s.lved by developing a s.itable numerical procedure s.ch as.implicit finite difference s.heme along with Newton’s.linearization method. The computational res.lts.for the flow quantities.have pres.nted graphically for the effects.of thermal radiation, vis.ous.dis.ipation, heat generation/abs.rption, vis.o-elas.icity, Hartmann number and the permeability parameter. Res.lts.demons.rated that Prandtl number has.more pronouncing effect on the temperature dis.ribution rather than the vis.os.ty parameter as.well as.the thermal radiation parameter. Further the velocity gradient changes.s.gnificantly due to the pres.nce of temperature dependent variable vis.os.ty.

关键词： MHD Flow Variable Vis.os.ty Vis.o-Elas.ic Fluid Vis.ous Dis.ipation Thermal Radiation

Fruit production and quality improvement in aonla （Emblica Officinalis.Gaertn.） through canopy management

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 Agricultural s.ience and Technology 2009年第8期3卷 40-42,48页

作者： s. N. ghosh B. Bera A. Kundu s. Roy s. K. Dutta Ray Department of Fruits.and Orchard Management Bidhan Chandra Krishi Viswavidyalaya Nadia 741252 India MPs.Farm Paschim Midnapore 721504 India

In order to maintain the health and vigour and to s.s.ain the productivity, a pruning experiment was.conducted on four year old ＂Balwant＂ cultivar of aonla grown in laterite s.il, planted at a s.acing of 5m×5m. To find out the bes. pruning method, s.x levels.of pruning was.performed i.e., （1） Light judicious.pruning, （2） Detopping of primary branches.at 8 feet from ground level ＋ removal of all s.condary branches. （3） Detopping of primary branches.at 8 feet from the ground level ＋ removal of all s.condary branches.at 2 feet from the bas. of primary branches. （4） Detopping of primary branches.at 8 feet from the ground level ＋ removal of all s.condary branches.at 1 feet from the bas. of primary branches. （5） Light judicious.pruning ＋ Detopping of plant canopy of at 8 feet from the ground level, （6） No pruning （control）. Res.lts.of three cons.cutive years.of inves.igation revealed that light judicious.pruning of thin, overlapping, cris.-cros.ed, dead, unproductive and looping branches.gave highes. fruit yield in all the three years.and res.lted 64.4 percent yield increment over control when average of three years.was.cons.dered. s.vere pruning of primary and s.condary branches.caus.d dras.ic reduction of yield for two cons.cutive years.after pruning. Judicious.pruning helped to produce better s.zeable and quality fruits.

关键词： aonla clos. s.acing pruning canopy management yield fruit quality

s.nthes.s.and Electrical Characterization of BaTiO3 Thin Films.on s.(100)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials.s.iences.and Applications 2010年第4期1卷 187-190页

作者： V. R. Chinchamalatpure s. A. ghosh G. N. Chaudhari 不详

BaTiO3 thin film has.been depos.ted on s.(100) s.bs.rate us.ng s.l-gel proces. and depos.ted by us.ng s.in – coating technique. The BaTiO3/s.(100) s.ructures.were s.udied by s.ructural and electrical characteris.ics. The X-ray diffrac-tion of BaTiO3/s.(100) s.ows.that the diffraction peaks.become increas.ng s.arp with increas.ng calcination tempera-tures.indicating the enhance crys.allinity of the films. s.anning electron micros.opy of BaTiO3 thin films.s.ows.the crack free and uniform nature. The capacitance-voltage meas.rement of BaTiO3 thin film depos.ted on s.(100) an-nealed at 600℃ s.ows.large frequency dis.ers.on in the accumulation region. The current-voltage meas.rement of BaTiO3/s. s.ows.the ideality factor was.approaches.to unity at 600℃.

关键词： s.l-Gel Technique BaTiO3 Thin Film C-V I-V

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

用于黄麻精纺的假拈管牵伸装置

国外纺织技术 1984年第11期 19-22页

作者： s. K. ghosh 张元明

一、前言从纤维到细纱的生产中,精纺是最昂贵的工序。精纺机运转每小时的产量,仅是并条和粗纱机的一半,是梳麻机的三分之一。如果机器采用大牵伸,通过调整喂入速度而不改变输出定量,则能增加机器的产量。这样需要的机器就较少,并因此节... 详细信息

一、前言从纤维到细纱的生产中,精纺是最昂贵的工序。精纺机运转每小时的产量,仅是并条和粗纱机的一半,是梳麻机的三分之一。如果机器采用大牵伸,通过调整喂入速度而不改变输出定量,则能增加机器的产量。这样需要的机器就较少,并因此节省电力。在精纺时,大或适中的牵伸是需要的,因为它能帮助减少一些纺纱准备的道数,而这在较早使用的小牵伸细纱机上是不能做到的。但如果纤维在牵伸区内不能很好地控制,在精纺时使用较大的牵伸也有一些不利。

关键词：黄麻加工管嘴劳氏罗拉纺织机械零部件精纺机细纱机假捻纺织机械机构牵伸装置滑溜牵伸喂入后纺精纺

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

砖红壤地带腰果的氮磷钾需要量研究

世界热带农业信息 1992年第1期 43-45,47页

作者： s. N. ghosh 黄财城

为使氮磷钾的需要量标准化,提高西孟加拉邦砖红壤地区的腰果产量,1986～1988年在该邦的贾尔格兰姆(Jhargram)地区研究站进行了研究。处理为每年每株单独或混合施氮0,300,600克,磷0,200,400克和钾0,300,600克。植株4年生时(1985年)施全... 详细信息

为使氮磷钾的需要量标准化,提高西孟加拉邦砖红壤地区的腰果产量,1986～1988年在该邦的贾尔格兰姆(Jhargram)地区研究站进行了研究。处理为每年每株单独或混合施氮0,300,600克,磷0,200,400克和钾0,300,600克。植株4年生时(1985年)施全量肥料。2年的研究结果表明,施最高水平的氮(600克/株·年)显著增加单株坚果数及坚果产量,施较高水平的磷(400克/株)也增产(增加果数及重复),施较低量的钾(300克/株)也增产。只有施氮600克/株·年的处理才显著提高出仁率。

关键词：砖红壤磷钾西孟加拉邦研究站格兰姆施全出仁率肥料试验贾尔生时