检索结果-南通市图书馆

Nitrogen upta.e by phytopla.kton in surfa.e wa.ers of the India. sector of Southern Ocea. during a.stra. summer

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 Ea.th Science 2018年第1期12卷 52-62页

作者： S. C. TRIPa.HY SIVa.I Pa.Ra.K. VISHNU Va.DHa. a. sarkar R. K. MISHRa.N. a.ILKUMa. ESSO-Na.iona. Centre for a.ta.ctic a.d Ocea. Resea.ch Ministry of Earth Sciences Headland Sada Vasco-da-Gama Goa 403804 India ESSO-Integra.ed Coa.ta. a.d Ma.ine a.ea.Ma.a.ement-PD Ministry of Earth Sciences NIOT Campus Velachery Pallikaranai Chennai 600100 India

This study reports the nitrogen upta.e ra.e （using 15N tra.er） of phytopla.kton in surfa.e wa.ers of different fronta. zones in the India. sector of the Southern Ocea. （SO） during a.stra. summer of 2013. The investiga.ed a.ea.encompa.ses four ma.or fronta. systems, i.e., the subtropica. front （STF）, suba.ta.ctic front （Sa.）, pola. front-1 （PF1） a.d pola. front-2 （PF2）. Southwa.d decrea.e of surfa.e wa.er tempera.ure wa. observed, wherea. surfa.e sa.inity did not show a.y significa.t trend. Nutrient （NO3- a.d SiO44-） concentra.ions increa.ed southwa.d from STF to PF; while a.monium （NH4＋）, nitrite （NO2-） a.d phospha.e （PO433 rema.ned compa.a. tively sta.le. a.a.ysis of nutrient ra.ios indica.ed potentia. N-limited conditions a. the STF a.d Sa. but no such scena.io wa. observed for PF. In terms of phytopla.kton bioma.s, PF1 wa. found to be the most productive followed by Sa., wherea. PF2 wa. the lea.t productive region. Nitra.e upta.e ra.e increa.ed with increa.ing la.itude, a. no systema.ic spa.ia. va.ia.ion wa. discerned for NH4＋ a.d urea.（CO（NH2）2）. Linea. rela.ionship between nitra.e a.d tota. N-upta.e revea.s tha. the studied a.ea.is ca.a.le of exporting up to 60% of the tota. production to the deep ocea. if the environmenta. settings a.e fa.ora.le. Like N-upta.e ra.es the f-ra.io a.so increa.ed towa.ds PF region indica.ing compa.a.ively higher new production in the PF tha. in the subtropics. The modera.ely high a.era.efira.io （0.53） indica.es potentia.ly nea. equa. contributions by new production a.d regenera.ed production to the tota. productivity in the study a.ea. Eleva.ion in N-upta.e ra.es with declining tempera.ure suggests tha. the SO with its va.t qua.tity of cool wa.er could pla. a. importa.t role in dra.ing down the a.mospheric CO2 through the ＂solubility pump＂.

关键词： nitrogen upta.e f-ra.io new productivity,fronta. zones Southern Ocea.

a.a.ysis of Neutronics a.d Therma.-Hydra.lic Beha.ior in a.Fuel Pin of Pressurized Wa.er Rea.tor (PWR)

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 Journa. of Nuclea. Science a.d Technology 2019年第2期9卷 74-83页

作者： Md. Ghula. Za.ir M. a. Ra.hid sarkar a.ta. Hossa.n Nuclea. Science a.d Engineering (NSE) Depa.tment Military Institute of Science and Technology (MIST) Dhaka Bangladesh

This pa.er presents a.compa.a.ive a.a.ysis of different pa.a.eters such a. entha.py, modera.or tempera.ure, modera.or density, flow velocity, pressure, a.d fuel tempera.ure profile a. the fuel pin cell level of PWR. Moreover, in this pa.er pitches to fuel pin ra.ius ra.io a.e va.ied from 2.3 to 4. The methods a.d implementa.ion stra.egy a.e such tha. the coupled neutronic a.d therma.-hydra.lic a.a.ysis is executed in a.fully one dimensiona. (1D) ma.ner. The therma. hydra.lic is ba.ed on modera.or/coola.t ma.s a.d entha.py equa.ion together with one group diffusion equa.ion for fuel pin. Modelling of fuel pin cell a.d subcha.nel is executed in two steps. First, the governing equa.ions a.e derived a.suming tha. a.l the pa.a.eters a.pea.ing in the equa.ions a.e tempera.ure independent. Fuel pin centerline tempera.ure a.d ra.ia.ly a.era.ed tempera.ure equa.ions a.e derived from Fourier la.s of therma. conductivity. Fina.ly, diffusion coefficient, fission cross-section a.d a.sorbing cross-section a.e eva.ua.ed with respect to the fuel pin tempera.ure. The outcome will be helpful for further neutronics a.d therma. a.a.ysis of PWR. Therma. hydra.lics pa.a.eter va.ies the ma.imum 30 percenta.e from the lowermost va.ue.

关键词： Fuel Pin Pitch Sub-Cha.nel Neutronics a.d Therma. Hydra.lics

Ta.e of mitochondria.a.d mitochondria.a.socia.ed ER membra.e in pa.ient-derived neurona. models of Wolfra. syndrome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neura. Regenera.ion Resea.ch 2025年第9期20卷 2587-2588页

作者： La.titia.a.bry Timothy Ba.rett Sova. sarkar I-STEM CECSCorbeil-EssonnesFrance UniversitéPa.is-Sa.la. Universitéd’EvryINSERMI-STEMUMR861Corbeil-EssonnesFrance Institute of Ca.cer a.d Genomic Sciences Institute of Biomedical ResearchCollege of Medical and Dental SciencesUniversity of BirminghamEdgbastonBirminghamUK Depa.tment of Endocrinology Birmingham Women’s and Children’s HospitalSteelhouse LaneBirminghamUK

Mitochondria.a.d mitochondria.a.socia.ed endopla.mic reticulum membra.e in neurodegenera.ive disea.es:Mitochondria.genera.e most of the chemica. energy needed to power the biochemica. rea.tions of cells,a.d thus a.e often referred to a. the"powerhouse"of the ***,this orga.elle is a.so involved in a.pleth,ora.of different cellula. functions such a. ca.cium(Ca.(2+))homeosta.is,a.optosis,oxida.ive stress,a.d severa. meta.olic pa.hwa.s including oxida.ive phosphoryla.ion,trica.boxylic a.id cycle,a.dβ-oxida.ion of fa.ty a.ids.

关键词： oxida.ive cycle ca.boxylic

在线全文

学校读者我要写书评

暂无评论

桑的稳产性

中国蚕业 1987年第1期 39-40页

作者： a. sarkar B. C. Da. S. P. Cha.ra.orty 杨今后

在桑品种选育中若干品系要经多年多点的产量试验来选择最优的品种。基因型X环境的相互关系是主要的变异因子,即基因型的相对表现随环境条件的不同而不同。这种对不同环境条件的不同反应,对育种工作者决定应该选择怎样的基因型带来困难... 详细信息

在桑品种选育中若干品系要经多年多点的产量试验来选择最优的品种。基因型X环境的相互关系是主要的变异因子,即基因型的相对表现随环境条件的不同而不同。这种对不同环境条件的不同反应,对育种工作者决定应该选择怎样的基因型带来困难。本文论述了通过对稳定性参数的估计来选择最优的品种。

关键词：回归系数平均产量反应年份稳产性产量性状

Spa.io-tempora. eva.ua.ion of Zr pla.ma.pa.a.eters in a.single-bea.-splitting double-pulse la.er-induced pla.ma

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Pla.ma.Science a.d Technology 2021年第2期23卷 47-56页

作者： a.na. sarkar Ma.jeet SINGH Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400085India Homi Bha.ha.Na.iona. Institute AnushaktinagarMumbai 400094India

The pla.ma.shielding effect is one of the ma.or wea.nesses of la.er-induced brea.down spectroscopy(LIBS)a. it ca.ses non-linea.ity in signa. *** LIBS is typica.ly ca.ried out in consta.t la.er energy,this non-linea.ity ca.ses a.reduction in *** this work,we systema.ica.ly exa.ine la.er-induced pla.ma.formed by two different excita.ion source modes,*** pulse(SP)-excita.ion a.d single-bea.-splitting double-pulse(SBS-DP)-excita.ion over Zr-2.5%Nb *** two most importa.t pla.ma.pa.a.eters influencing the emission line intensity,pla.ma.tempera.ure(Te)a.d electron density(Ne)were studied a.d compa.ed for both modes of la.er *** of the results conclusively demonstra.es tha. due to the splitting of the la.er energy in the SBS-DP mode,the pla.ma.shielding effect is significa.tly *** reduced pla.ma.shielding tra.sla.es to a. increa.ed la.er–sa.ple coupling under SBS-DP *** ima.ing of the tota. intensity of the la.er-induced pla.ma.in both excita.ion modes wa. a.so *** study shows how the pla.ma.shielding effect ca. be reduced to improve the a.a.ytica. qua.ity of the LIBS methodology.

关键词： LIBS single-bea.-splitting double pulse spa.ia.-tempora. evolution pla.ma.tempera.ure electron density

Seismic bea.ing ca.a.ity of strip footing on pa.tia.ly sa.ura.ed soil using moda. response a.a.ysis

在线全文

学校读者我要写书评

暂无评论

Ea.thqua.e Engineering a.d Engineering Vibra.ion 2022年第3期21卷 641-662页

作者： a.hijit a.a.d Ra.ib sarkar Depa.tment of Civil Engineering IIT(ISM)DhanbadDhanbad 826004India

The present study proposes a.novel a.d simplified methodology to a.sess the seismic bea.ing ca.a.ity(SBC) of a.sha.low strip footing by incorpora.ing strength non-linea.ity a.ising due to pa.tia. sa.ura.ion of a.soil ma.rix. Furthermore, developed methodology incorpora.es the moda. response a.a.ysis of soil la.ers to a.sess SBC. a.consta.t ma.ric suction distribution profile ha. been considered throughout the depth of the soil. The Va. Genuchten equa.ion a.d corresponding fitting pa.a.eters ha.e been considered to qua.tify ma.ric suction in the a.a.ysis. SBC ha. been obta.ned for three different geoma.eria.s;viz. sa.d, fly a.h a.d cla., ba.ed on their predomina.t gra.n size a.d diverse soil wa.er cha.a.teristics curve(SWCC) a.tributes. Va.ia.ion of SBC with different modes of vibra.ion a.d da.ping ra.io a.e reported for ra.ges of ma.ric suction pertinent to the geoma.eria.s considered in the study. The rela.ive significa.ce of ma.ric suction on SBC ha. been reported for suction va.ues within the tra.sition zone of ea.h geoma.eria.. It is observed tha. the SBC of sa.d is dra.tica.ly reduced, with ma.ric suction rea.hing beyond the residua. suction va.ue. The SBC of fly a.h rema.ns consta.t beyond the residua. suction va.ue, wherea. the SBC of cla. shows a. increa.ing trend towa.d the pra.tica. ra.ge of ma.ric suction va.ues.

关键词： seismic bea.ing ca.a.ity moda. a.a.ysis ma.ric suction

Spectra. la.s of fla.ing events in LS I+61°303 from RXTE Observa.ions

在线全文

学校读者我要写书评

暂无评论

Resea.ch in a.tronomy a.d a.trophysics 2016年第7期16卷 29-38页

作者： Ta.a. sarkar Sa.ir sarkar a.una.a.Bha.ra High Energy&Cosmic Ra. Resea.ch Centre University of North BengalSiliguriWB 734013India University Science Instrumenta.ion Centre University of North BengalSiliguriWB 734013India

This work reports the first discovery of（nega.ive） spectra. la.s in X-ra. emission below 10 ke V from the ga.ma.ra. bina.y LS I＋61？303 during la.ge fla.ing episodes using Rossi X-ra. Timing Explorer（RXTE） observa.ions. It is found from the RXTE da.a.tha. during the fla.es, low energy（3–5 ke V） va.ia.ions lea. the higher energy（8–10 ke V） va.ia.ions by a.few tens of seconds wherea. no significa.t time la. is observed during the non-fla.ing sta.es. The observed spectra. la. fea.ures for fla.ing events suggest tha. inverse Compton sca.tering ma. be opera.ing, a. lea.t in some pa.t of the system. a.other possibility is tha. the sites of pa.ticle a.celera.ion ma. be different for fla.ing a.d non-fla.ing events such a. in the microqua.a. model, in which the fla.ing ra.ia.ion ma. come from hot spots sitting a.ove the bla.k hole while stea.y sta.e emissions a.e due to the jets.

关键词： X-ra.s:bina.ies X-ra.s:individua.(LS I+61?303)

Study of flow cha.a.teristics within ra.domly distributed submerged rigid vegeta.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of Hydrodyna.ics 2019年第2期31卷 358-367页

作者： Pa.omita.Cha.ra.orty a.inda. sarkar School of Civil Engineering Kalinga Institute of Industrial Technology(KIIT)Deemed to be UniversityBhubaneswarOdishaIndia School of Infra.tructure Indian Institute of Technology(IIT)Bhubaneswar AurgulBhubaneswarOdishaIndia

Flow through submerged rigid vegeta.ion ha. been studied both a.a.ytica.ly a.d *** Reynolds stress,present in the governing equa.ion,ha. been modeled using one of the turbulent stress equa.ions,a.opted in numerous *** a.va.nta.e of this turbulent stress model is to repla.e the mixing length non linea. term of the stress with a.linea. rela.io n between stress a.d the velocity *** velocity field a.d shea. stress a.e obta.ned by solving the governing force ba.a.ce equa.ion numerica.ly.a.correla.ion,va.ida.ed with the experimenta. results,ha. been developed for the releva.t non-dimensiona. numbers.

关键词： Submerged vegeta.ion Reynolds stress dra. force strea. wise velocity

La.er-induced pla.ma.electron number density:Sta.k broa.ening method versus the Sa.a.Boltzma.n equa.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pla.ma.Science a.d Technology 2017年第2期19卷 43-51页

作者： a.na. sarkar Ma.jeet SINGH Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400 085India

We report spectroscopic studies on pla.ma.electron number density of la.er-induced pla.ma.produced by ns-Nd：Ya. la.er light pulses on a. a.uminum sa.ple in a.r a. a.mospheric pressure. The effect of different la.er energy a.d the effect of different la.er wa.elengths were compa.ed. The experimenta.ly observed line profiles of neutra. a.uminum ha.e been used to extra.t the excita.ion tempera.ure using the Boltzma.n plot method, wherea. the electron number density ha. been determined from the Sta.k broa.ened a. well a. using the Sa.a.Boltzma.n equa.ion （SBE）. Ea.h a.proa.h wa. a.so ca.ried out by using the a. emission line a.d Mg emission lines. It wa. observed tha. the,SBE method genera.ed a.little higher electron number density va.ue tha. the Sta.k broa.ening, method, but within the experimenta. uncerta.nty ra.ge. Compa.isons of Ne determined by the two methods show the presence of a.linea. rela.ion which is independent of la.er energy or la.er wa.elength. These results show the a.plica.ility of the SBE method for a.e determina.ion, especia.ly when the system does not ha.e a.y pure emission lines whose electron impa.t fa.tor is known, a.so use of Mg lines gives superior results tha. a. lines.

关键词： pla.ma.pa.a.eter la.er induced pla.ma pla.ma.electron density Sa.a.Boltzma.nmethod Sta.k broa.ening method