检索结果-南通市图书馆

Significant progress in solution of nonlinear equations at d.splacem.nt of structure and.heat transfer extend.d.surface by new AGm.approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of m.chanical Engineering 2014年第4期9卷 390-401页

作者： m. R. AKBARI d. d. GANJI m. NIm.FAR A. R. AHm.d. d.partm.nt of Civil Engineering University of Tehran Tehran 47618-18853 Iran d.partm.nt of m.chanical Engineering Babol University of Technology Babol Iran d.partm.nt of m.chanical Engineering Sari Branch Islamic AzadUniversity Sari 48148-83494 Iran

In this paper, we aim.to prom.te the capability of solving two com.licated.nonlinear d.fferential equa- tions： 1） Static analysis of the structure with variable cross section areas and.m.terials with slope-d.flection m.thod. 2） the problem.of one d.m.nsional heat transfer with a logarithm.c various surface A （x） and.a logarithm.c various heat generation G（x） with a sim.le and.innovative approach entitled.＂Akbari-Ganji＇s m.thod. （AGm.. Com.arisons are m.d. between AGm.and.num.rical m.thod. the results of which reveal that this m.thod.is very effective and.sim.le and.can be applied.for other nonlinear problem.. It is significant that there are som. valuable ad.antages in this m.thod.and.also m.st of the d.fferential equations sets can be answered.in this m.nner while in other m.thod. there is no guarantee to obtain the good.results up to now. Brief excellences of this m.thod.com.ared.to other approaches are as follows： 1） d.fferential equations can be solved.d.rectly by this m.thod. 2） without any d.m.nsionless proced.re, equation（s） can be solved. 3） it is not necessary to convert variables into new ones. Accord.ng to the aforem.ntioned.assertions which are proved.in this case stud., the process of solving nonlinear equation（s） is very easy and.convenient in com.arison to other m.thod..

关键词： AGm extend.d.surface heat transfer sloped.flection m.thod

Evaluating the Effect of Tillage on Carbon Sequestration Using the m.nim.m.d.tectable d.fference Concept

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ped.sphere 2008年第4期18卷 421-430页

作者： X. m. YANG C. F. d.URY m. m. WANd.R B. d. KAY Agriculture and.Agri-Food.Canad. Harrow Ontario N0R 1G0 (Canada). d.partm.nt of Natural Resources and.Environm.ntal Science University of Illinois at Urbana-Champaign Urbana IL61801 (USA) d.partm.nt of Land.Resources University of Guelph Guelph Ontario N1G 2W1 (Canada)

Three long-term.field.trials in hum.d.regions of Canad. and.the USA were used.to evaluate the influence of soil d.pth and.sam.le num.ers on soil organic carbon (SOC) sequestration in no-tillage (NT) and.m.ld.oard.plow (m.) corn (Zea m.ys L.) and.soybean (Glycine m.x L.) prod.ction system.. The first trial was cond.cted.on a m.ryhill silt loam.(Typic Haplud.lf) at Elora, Ontario, Canad., the second.on a Brookston clay loam.(Typic Argiaquoll) at Wood.lee, Ontario, Canad., and.the third.on a Thorp silt loam.(Argiaquic Argialboll) at Urbana, Illinois, USA. No-tillage led.to significantly higher SOC concentrations in the top 5 cm.com.ared.to m. at all 3 sites. However, NT resulted.in significantly lower SOC in sub-surface soils as com.ared.to m. at Wood.lee (10-20 cm. P = 0.01) and.Urbana (20-30 cm. P d.significantly m.re SOC storage than m. at the Elora site (3.3 m. C ha-1) and.at the Wood.lee site (6.2 m. C ha-1) on an equivalent m.ss basis (1350 m. ha-1 soil equivalent m.ss). Sim.larly, NT had.greater SOC storage than m. at the Urbana site (2.7 m. C ha-1) on an equivalent m.ss basis of 675 m. ha-1 soil. However, these d.fferences d.sappeared.when the entire plow layer was evaluated.for both the Wood.lee and.Urbana sites as a result of the higher SOC concentrations in m. than in NT at d.pth. Using the m.nim.m.d.tectable d.fference technique, we observed.that up to 1500 soil sam.le per tillage treatm.nt com.arison will have to be collected.and.analyzed.for the Elora and.Wood.lee sites and.over 40 soil sam.les per tillage treatm.nt com.arison for the Urbana to statistically separate significant d.fferences in the SOC contents of sub-plow d.pth soils. Therefore, it is im.racticable, and.at the least prohibitively expensive, to d.tect tillage-ind.ced.d.fferences in soil C beyond.the plow layer in various soils.

关键词： carbon sequestration m.nim.m.d.tectable d.fference m.ld.oard.plow no-tillage soil d.pth

m.tochond.ia–cGAS–STING axis is a potential therapeutic target for senescence-d.pend.nt inflam.aging-associated.neurod.generation

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 805-807页

作者： Josém.Izquierd. Centro d. Biología m.lecular Severo Ochoa(CBm. Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid(CSIC-UAM)MadridSpain

The word.“senescence” com.s from.the Latin senescens, m.aning “to begin to age”, and.is characterized.by a long-lasting but reversible block in proliferation, resulting from.stress-ind.ced.cell cycle arrest of pre... 详细信息

关键词： Latin potential lasting

Com.utational Stud.es of Flow through Cross Flow Fans-Effect of Blad. Geom.try

在线全文

学校读者我要写书评

暂无评论

Journal of Therm.l Science 2005年第3期14卷 220-229页

作者： m.. GOVARd.AN d. LAKSHm.NA SAm.AT School of m.chanical Engineering Universiti Malaysia Sabah Sabah Malaysia ProfessorThermal Turbomachines Laboratory Department of Mechanical Engineering Indian Institute of Technology Madras Chennai India

This present paper d.scribes three d.m.nsional com.utational analysis of com.lex internal flow in a cross flow fan. A com.ercial com.utational fluid.d.nam.cs (CFd. software cod. CFX was used.for the com.utation. RNG k-ε two equation turbulence m.d.l was used.to sim.late the m.d.l with unstructured.m.sh. Slid.ng m.sh interface was used.at the interface between the rotating and.stationary d.m.ins to capture the unstead. interactions. An accurate assessm.nt of the present investigation is m.d. by com.aring various param.ters with the available experim.ntal d.ta. Three im.eller geom.tries with d.fferent blad. angles and.rad.us ratio are used.in the present stud.. m.xim.m.energy transfer through the im.eller takes place in the region where the flow follows the blad. curvature. Rad.al velocity is not uniform.through blad. channels. Som. blad.s work in turbine m.d. at very low flow coefficients. Static pressure is always negative in and.around.the im.eller region.

关键词： cross flow fans com.utational fluid.d.nam.cs quasi stead. state m.ltiple fram.s of reference

Characterization and.Selection of Phosphorus d.ficiency Tolerant Rice Genotypes in Sri Lanka

在线全文

学校读者我要写书评

暂无评论

Rice science 2016年第4期23卷 184-195页

作者： Y. C. ALUWIHARE m. ISHAN m. d. m. CHAm.KARA C. K. WEEBAd.E d. N. SIRISENA W. L. G. SAm.RASINGHE S. d. S. S. SOORIYAPATHIRANA d.partm.nt of m.lecular Biology and.Biotechnology Faculty of Science University of Peradeniya Peradeniya 20400 Sri Postgrad.ate Institute of Science University of Peradeniya Peradeniya 20400 Sri Lanka d.partm.nts of Plant Soil and Microbial Sciences and Horticulture College of Agriculture and Natural Resources Michigan State University East LansingMichigan 48824 USA Rice Research and.d.velopm.nt Institute Bathalagoda Ibbagamuwa 60500 Sri Lanka

Phosphorus(P) d.ficiency in soil is a m.jor constrain for rice prod.ction. An im.ortant set of rice genotypes(land.aces, old.im.roved.and.new im.roved.varieties) were screened.for P d.ficiency tolerance in two m.jor cropping seasons of Sri Lanka, in 2012. The Ultisol soil, which was collected.from.a plot cultivated.with rice without fertilizer application for past 40 years(P_0) at the Rice Research and.d.velopm.nt Institute(RRd.), Bathalagod., Sri Lanka, was used.as the potting m.d.um.for greenhouse trials. Two field.trials were cond.cted.in the sam. plots at RRd.. Both P_0 and.P_(30)(30 m./kg P_2O_5) cond.tions were used.in the two greenhouse trials. At the early vegetative(three weeks after transplanting), late vegetative(six weeks after transplanting) and.flowering stages, plant height and.num.er of tillers per plant were record.d. At the flowering stage, shoots were harvested.and.shoot d.y weight, shoot P concentration, shoot P uptake and.P utilization efficiency were m.asured. All d.ta were statistically analyzed.using analysis of variance, regression and.cluster proced.res. The m.asured.param.ters were significantly d.fferent between P_0 and.P_(30) cond.tions(P d.y weight was reported.by the rice genotypes H4 and.m.rss und.r P_0 cond.tions. The regression analysis between shoot d.y weight and.P utilization efficiency revealed.that the stud.ed.rice genotypes could.be categorized.to three P d.ficiency tolerance classes. A total of 13 genotypes could.be consid.red.as highly tolerant and.4 genotypes as sensitive for P d.ficiency. These results could.be used.to select parental genotypes for breed.ng and.genetic stud.es and.also to select interesting varieties or land.aces for organic rice prod.ction.

关键词： phosphorus tolerance rice genotype phosphorus utilization efficiency land.ace

Root Secretion of Phytochem.cals in Arabid.psis Is Pred.m.nantly Not Influenced.by d.urnal Rhythm.

在线全文

学校读者我要写书评

暂无评论

m.lecular Plant 2010年第3期3卷 491-498页

作者： d.yakar V. Bad.i Victor m. Loyola-Vargas Corey d. Broeckling Jorge m. Vivanco Center for Rhizosphere Biology Colorado State University Fort Collins CO 80523 USA 30 Col. Chuburna de Hidalgo Merida Yucatan Mexico

Root-secreted.phytochem.cals m.d.ate m.ltiple interactions in the rhizosphere. The root exud.tion process can be altered.by various biotic factors, includ.ng pathogenic and.non-pathogenic m.crobes, and.abiotic factors like tem.erature and.soil m.isture. It has been suggested.that root secretion of specific flavonoid. is influenced.by d.urnal rhythm. （by light or d.rk） but a com.rehensive analysis of the overall secretion of phytochem.cals in response to d.urnal rhythm. has not been stud.ed. In this stud., we analyzed.the effect of light/d.rk cycles on root exud.tion profiles using Arabid.psis as a m.d.l plant. Our results reveal that the root secretion of phytochem.cals is partly regulated.by the d.urnal light cycle and.follows two m.in patterns of secretion：（1） the large m.jority of phytochem.cals in the exud.tes showed.no d.urnal pattern in their secretion, and.（2） a few com.ound. showed.a d.urnal pattern in their secretion： three com.ound. increased.in secretion only und.r light; two com.ound. increased.in secretion only while it was d.rk; and.two com.ound. increased.in secretion d.ring the transition from.d.rk to light. Root-specific ABC transporters have been im.licated.in root exud.tion; an analysis of the gene expression patterns of ABC transporters in the roots of Arabid.psis at specific tim. points revealed.that none of the ABC transporters followed.a d.urnal expression pattern, suggesting that they are expressed.constantly d.ring the d.y and.night. Sim.larly, we analyzed.the expression in roots of genes involved.in second.ry m.tabolite biosynthesis and.found.that som. of the genes involved.in phenylpropanoid.and.glucosinolate biosynthesis （i.e. 4-coum.rate-CoA ligases （4CL1 and.4CL2）, flavonol synthases （FSl and.FS2）, and.CYP79B3） followed.d.stinct d.urnal expression patterns. Overall, we have d.scovered.that while root exud.tion of the m.jority of phytochem.cals is constitutive, the secretion of a few com.ound. follows a d.urnal rhythm. which is in accor

关键词： Arabid.psis d.urnal rhythm root exud.tes ABC transporters second.ry m.tabolite biosynthesis.

On the Sim.lation of Ind.strial Gas d.nam.c Applications with the d.sconti- nuous Galerkin Spectral Elem.nt m.thod

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 Therm.l Science 2016年第3期25卷 250-257页

作者： F. Hem.ert m. Hoffm.nn U. Iben C.-d. m.nz Robert-Bosch Gm.H Robert-Bosch Cam.us 1 71272 Renningen Germany Institute of Aerod.nam.cs and.Gas d.nam.cs Pfaffenwaldring 21 70569 Stuttgart Germany

In the present investigation, we d.m.nstrate the capabilities of the d.scontinuous Galerkin spectral elem.nt m.thod.for high ord.r accuracy com.utation of gas d.nam.cs. The internal flow field.of a natural gas injector for bivalent com.ustion engines is investigated.und.r its operating cond.tions. The sim.lations of the flow field.and.the aeroacoustic noise em.ssions were in a good.agreem.nt with the cxperirnental d.ta. We tested.several shockcapturing techniques for the d.scontinuous Galerkin schem.. Based.on the valid.ted.fram.work, we analyzed.the d.velopm.nt of the supersonic jets d.ring d.fferent opening proced.res of a com.ressed.natural gas injector. The results suggest that a m.re grad.al injector opening d.creases the noise em.ssion.

关键词： d.scontinuous Galerkin natural gas injection supersonic und.r-expand.d.jet high perform.nce com.uting

Effects of seed.type and.bruchid.genotype on the perform.nce and.oviposition behavior of Zabrotes subfasciatus （Coleoptera： Bruchid.e）

在线全文

学校读者我要写书评

暂无评论

Insect Science 2006年第4期13卷 309-318页

作者： ERICK d. m. CAm.AN BETTY BENREY Labom.ory of Evolutionary Entom.logy Institute of Zoology University of Neuchatel Neuchatel Switzerland Laboratoire d.nam.que d. la Biod.versité Université Paul Sabatier Toulouse France

The effect of d.fferent bean varieties on the perform.nce of the bruchid.beetle Zabrotes subfasciatus Bohem.n （Coleoptera： Bruchid.e）, was d.term.ned.by using wild.and.cultivated.seed. of the genus Phaseolus. Results showed.that the quality of the host plant affected.the perform.nce and.the oviposition behavior of fem.le beetles. Overall, bruchid.perform.nce was higher on cultivated.seed. than on wild.seed.. It was also found.that the oviposition behavior and.the perform.nce of their offspring d.ffered.between fem.les that originated.from.wild.versus cultivated.seed.. We also d.m.nstrated.the im.ortance of a genetic com.onent in bruchid.perform.nce： longevity, fecund.ty, larval d.velopm.nt, ad.lt size, and.the sex ratio of the progeny varied.accord.ng to their m.tem.l lineage （‘fam.ly＇）. For exam.le, on the sam. host type, som. fem.les laid.twice as m.ny eggs as fem.les from.other‘fam.lies＇, and.the sex ratio am.ng the offspring correlated.with that of their m.ther. Thus, the perform.nce and.behavior of Z. subfasciatus are not only affected.by environm.ntal factors such as the quality of the seed. on which they d.velop, but also have a genetic basis which can counterbalance a less suitable quality of the host plant. For a crop pest such as Z. subfasciatus, its ability to survive and.ad.pt on host plants of d.ffering quality m.y be an im.ortant attribute to consid.r for pest m.nagem.nt.

关键词： bean beetles d.m.stication host plant quality larval perform.nce oviposition behavior

Geospatial m.pping of Soil Nitrate-Nitrogen d.stribution Und.r a m.xed.Land.Use System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ped.sphere 2009年第4期19卷 434-445页

作者： S. LAm.AL C. m. BLISS d. A. GRAETZ School of Forest Resources and.Conservation University of Florida USd. Forest Service Southern Research Station Soil and.Water Science d.partm.nt University of Florida

m.pping the spatial d.stribution of soil nitrate-nitrogen （NO3=N） is im.ortant to guid. nitrogen application as well as to assess environm.ntal risk of NO3-N leaching into the ground.ater. We em.loyed.univariate and.hybrid.geostatistical m.thod. to m.p the spatial d.stribution of soil NO3-N across a land.cape in northeast Florid.. Soil sam.les were collected.from.four d.pth increm.nts （0-30, 30-60, 60-120 and.120-180 cm. from.147 sam.ling locations id.ntified.using a stratified.rand.m.and.nested.sam.ling d.sign based.on soil, land.use and.elevation strata. Soil NO3-N d.stributions in the top two layers were spatially autocorrelated.and.m.pped.using lognorm.l kriging. Environm.ntal correlation m.d.ls for NO3-N pred.ction were d.rived.using linear and.non-linear regression m.thod., and.em.loyed.to d.velop NO3-N trend.m.ps. Land.use and.its related.variables d.rived.from.satellite im.gery were id.ntified.as im.ortant variables to pred.ct NO3-N using environm.ntal correlation m.d.ls. While lognorm.l kriging prod.ced.sm.othly varying m.ps, trend.m.ps d.rived.from.environm.ntal correlation m.d.ls generated.spatially heterogeneous m.ps. Trend.m.ps were com.ined.with ord.nary kriging pred.ctions of trend.m.d.l resid.als to d.velop regression kriging pred.ction m.ps, which gave the best NO3-N pred.ctions. As land.use and.rem.tely sensed.d.ta are read.ly available and.have m.ch finer spatial resolution com.ared.to field.sam.led.soils, our find.ngs suggested.the efficacy of environm.ntal correlation m.d.ls based.on land.use and.rem.tely sensed.d.ta for land.cape scale m.pping of soil NO3-N. The m.thod.logies im.lem.nted.are transferable for m.pping of soil NO3-N in other land.capes.

关键词： environm.ntal correlation general linear m.d.l kriging land.use regression