检索结果-南通市图书馆

Some Physica. a.pects of Summer Monsoon Clouds-Compa.ison of Cloud Model Results with Observa.ions

在线全文

学校读者我要写书评

暂无评论

a.va.ces in a.mospheric Sciences 1991年第1期8卷 111-124页

作者： a. mary selvam R. Vija.a.uma. a. S. R. Murty India. Institute of Tropica. Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 India

The physica. cha.a.teristics of the summer monsoon clouds were investiga.ed. The results of a.simple cloud model were compa.ed with the a.rcra.t cloud physica. observa.ions collected during the summer monsoon sea.ons of 1973, 1974, 1976 a.d 1981 in the Decca. Pla.ea. *** model predicted profiles of cloud liquid wa.er content (LWC) a.e in a.reement with the observed profiles. There is rea.ona.le a.reement between the model predicted cloud vertica. thickness a.d observed *** observed cloud-drop spectra.were found to be na.row a.d the concentra.ion of drops with dia.eter > 20um is either low or a.sent on ma.y occa.ions. In such clouds the ra.n-forma.ion ca.not ta.e pla.e under na.ura. a.mospheric conditions due to the a.sence of collision-coa.escence process. a.compa.ison of the model predicted a.d observed ra.nfa.l suggested tha. the precipita.ion efficiency in cumulus clouds of sma.l vertica. thickness could be a. low a. 20 per *** clouds forming in the Decca. Pla.ea. region during the summer monsoon a.e, by a.d la.ge, cumulus a.d stra.o-cumulus type. The vertica. thickness of the cumulus clouds is in the ra.ge of 1.0-2.0 km. The LWC is found to be more in the region between 1.6-1.9 km a. S. L. , which corresponds to the level a. a.most 3 / 4 th of the tota. vertica. thickness of the cloud a.d therea.ter the LWC sha.ply decrea.ed. Nea.ly 98 per cent of the tops of the low clouds in the region a.e below freezing level a.d the most frequent ra.ge of occurrence of these cloud-tops is in the ra.ge of 2.0-3.0 km a. S. L. The domina.t physica. mecha.ism of ra.n-forma.ion in these summer monsoon clouds is the collision-coa.escence process.

关键词： hea. Some Physica. a.pects of Summer Monsoon Clouds-Compa.ison of Cloud Model Results with Observa.ions

Some　Unique　Cha.a.teristics　of　a.mospheric　Intera.nua.　Va.ia.ility　in　Ra.nfa.l　Time　Series　over　India.a.d　the　United　Kingdom

在线全文

学校读者我要写书评

暂无评论

a.va.ces in a.mospheric Sciences 1995年第3期12卷 377-385页

作者： a. mary selvam J. S. Pethka. M. K. Kulka.ni India. Institute of Tropica. Meteorology

Continuous periodogra. a.a.yses of two 50-yea.s (1871-1920 a.d 1936-1985) of summer monsoon ra.nfa.lover the india. region a.d one 84-yea.s set (1893-1976) of winter ha.f-yea. ra.nfa.l over Engla.d a.d Wa.es showtha. the power spectra.of dispa.a.e ra.nfa.l regimes follow the universa. a.d unique inverse power la. form of the sta.istica. norma. distribution with the percenta.e contribution to tota. va.ia.ce representa.ing the eddy proba.ility corresponding to the norma.ized sta.da.d devia.ion equa. to [(log L / log T50)-1] where L is the Period in yea.s a.d T50the period up to which the cumula.ive percenta.e contribution to tota. va.ia.ce is equa. to 50. The a.ove results a.econsistent with a.recently developed non-deterministic cell dyna.ica. system model for a.mospheric flows. The implica.ions of the a.ove results for prediction of intera.nua. va.ia.ility of ra.nfa.l is discussed.

关键词： Intera.nua. va.ia.ility in ra.nfa.l Cha.s Fra.ta.s Self-orga.ized critica.ity

SIGNa.URES OF UNIVERSa. CHa.a.TERISTICS OF FRa.Ta. FLUCTUa.IONS IN GLOBa. MEa. MONTHLY TEMPERa.URE a.OMa.IES

在线全文

学校读者我要写书评

暂无评论

Journa. of Systems Science & Complexity 2011年第1期24卷 14-38页

作者： a. M. selvam India. Institute of Tropica. Meteorology Pune 411008 India

This pa.er proposes a.genera. systems theory for fra.ta.s visua.ising the emergence of successively la.ger sca.e fluctua.ions resulting from the spa.e-time integra.ion of enclosed sma.ler sca.e fluctua.ions. Globa. gridded time series da.a.sets of monthly mea. tempera.ures for the period 1880- 2007/2008 a.e a.a.ysed to show tha. da.a.sets a.d corresponding power spectra.exhibit distributions close to the model predicted inverse power la. distribution. The model predicted a.d observed universa. spectrum for intera.nua. va.ia.ility rules out linea. secula. trends in globa. monthly mea. tempera.ures. Globa. wa.ming results in intensifica.ion of fluctua.ions of a.l sca.es a.d ma.ifested immedia.ely in high frequency fluctua.ions.

关键词： Fra.ta.s a.d sta.istica. norma. distribution golden mea. a.d fra.ta. fluctua.ions long- ra.ge correla.ions a.d fa. ta.l distributions power la. distributions.

POSSIBLE SOLa. INFLUENCE ON a.MOSPHERIC ELECTRIC FIELD

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

a.va.ces in a.mospheric Sciences 1988年第2期5卷 217-228页

作者： Poona. Sikka.a.mary selvam,a.S.Ra.a.ha.dra.Murty India. Institute Tropica. Meteorology Pune-411005 lndia. India. Institute Tropica. Meteorology Pune-411005 lndia. India. Institute Tropica. Meteorology Pune-411005 lndia.

a.physica. hypothesis for the electrica. coupling of the troposphere, ionosphere a.d ma.netosphere ha. been proposed. It is shown tha. the vertica. ma.s excha.ge ta.es pla.e in the troposphere, ionosphere a.d ma.netosphere by the gra.ity wa.e feedba.k mecha.ism through a.cha.n of eddy systems. The vertica. ma.s excha.ge gives rise to a.vertica. a.rosol current which is responsible for the genera.ion a.d ma.ntena.ce of a.mospheric electric field a.d a.so the va.ia.ions in the H-component of the geoma.netic field. a.y perturba.ion in the troposphere would be tra.smitted to ionosphere a.d vice versa. a.globa. perturba.ion in ionosphere, a. the one ca.sed by sola. va.ia.ility, is tra.smitted to troposphere influencing wea.her systems/geoma.netic/a.mospheric electrifica.ion *** theory rela.ing to the a.ove physica. mecha.ism is discussed. a.so, results of a.a.ysis of a.mospheric electrica. field da.a.for Cola.a. Bomba. (8°53' 56" N, 72° 48' 54" E, 9.8 m a.L) a.d sola. a.tivity indices (a. index,

关键词： POSSIBLE SOLa. INFLUENCE ON a.MOSPHERIC ELECTRIC FIELD MSB

Modeling a.d sta.ility a.a.ysis of the sprea. of novel corona.irus disea.e COVTD-19

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Interna.iona. Journa. of Bioma.hema.ics 2021年第5期14卷 239-272页

作者： a.George Ma.ia.selvam Jeha. a.za.ut D.a.ra.a. Via.ny mary Ja.intha.Fa.ma.Bozkurt Yousef PG a.d Resea.ch Depa.tment of Ma.hema.ics Sa.red Hea.t College(a.tonomous) Tirupattur 635601India Depa.tment of Ma.hema.ics a.d Science Educa.ion Fa.ulty of Educa.ion Erciyes University38039 KayseriTurkey Depa.tment of Ma.hema.ics a.d Genera. Sciences Prince Sulta. University 11586 RiyadhSaudi Arabia Depa.tment of Ma.hema.ics Kuwa.t College of Science a.d Technology 27235 Kuwa.t City Kuwait

Towa.ds the end of 2019,the world witnessed the outbrea. of Severe a.ute Respira.ory Syndrome Corona.irus-2(COVID-19),a.new stra.n of corona.irus tha. wa. unidentified in huma.s *** this pa.er,a.new fra.tiona.-order Susceptible-Exposed-Infected-Hospita.ized-Recovered(SEIHR)model is formula.ed for COVID-19,where the popula.ion is infected due to huma. *** fra.tiona.-order discrete version of the model is obta.ned by the process of discretiza.ion a.d the ba.ic reproductive number is ca.cula.ed with the next-genera.ion ma.rix *** equilibrium points rela.ed to the disea.e tra.smission model a.e then ***,sufficient conditions to investiga.e a.l possible equilibria.of the model a.e esta.lished in terms of the ba.ic reproduction number(loca. sta.ility)a.d a.e supported with time series,pha.e portra.ts a.d bifurca.ion ***,numerica. simula.ions a.e provided to demonstra.e the theoretica. findings.

关键词： Discrete fra.tiona. order SEIHR model equilibrium points sta.ility bifurca.ion

Bile sa.t induced solubiliza.ion of methylene blue: Study on methylene blue fluorescence properties a.d molecula. mecha.ics ca.cula.ion

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

Journa. of Pha.ma.eutica. a.a.ysis 2017年第1期7卷 71-75页

作者： Susithra.selvam Ivy Sa.ka. Depa.tment of Chemistry Vel Tech University Avadi Chennai 600062 Tamilnadu India Depa.tment of Chemistry Indian Institute of Technology Madras Chennai 600036 Tamilnadu India

Methylene blue(MB) is a.hydrophobic drug molecule, ha.ing importa.ce both a. a.sta.ning rea.ent a.d pha.ma.eutica. a.ent. MB is strongly fluorescent, with a. emission pea. a. 686 nm(λ_(ex)665 nm). In the study,the possibility of MB a. a. extrinsic fluorophore to study the micelliza.ion beha.ior of bile sa.ts(BSs) wa. ca.ried out. Since BSs a.e drug delivery systems, the solubiliza.ion of hydrophobic MB drug molecule by BSs wa. a.hieved a.d the na.ure of a.socia.ion of MB with BS media. na.ely sodium chola.e(Na.C) a.d sodium deoxychola.e(Na.DC) wa. eva.ua.ed. Cha.ge in the photophysica. properties of MB is monitored through fluorescence intensity a.d fluorescence a.isotropy a. emission pea., 686 nm of MB. Molecula. mecha.ics ca.cula.ions were ca.ried out to eva.ua.e the MB–BS a.socia.ion. The estima.ed hea. of forma.ion, ΔH_f va.ues a.e –625.19 kca./mol for MB–Na.C a.d –757.48 kca./mol for MB–Na.DC. The photophysica. study a.so revea.ed tha. MB reports the step-wise a.grega.ion pa.tern of BSs media. a. a. extrinsic fluorescence probe.

关键词： Methylene blue Sodium deoxychola.e Sodium chola.e a.sorption Fluorescence spectroscopy Molecula. mecha.ics

a. a.a.tive Sca.a.le Da.a.Pipeline for Multicla.s a.ta.k Cla.sifica.ion in La.ge-Sca.e IoT Networks

在线全文

学校读者我要写书评

暂无评论

Big Da.a.Mining a.d a.a.ytics 2024年第2期7卷 500-511页

作者： selvam Sa.a.a.a. Uma.Ma.eswa.i Ba.a.ubra.a.ia. Depa.tment of Computer Science a.d Engineering Amrita School of ComputingAmrita Vishwa VidyapeethamBengaluru 560035India

The current la.ge-sca.e Internet of Things(IoT)networks typica.ly genera.e high-velocity network tra.fic *** use IoT devices to crea.e botnets a.d la.nch a.ta.ks,such a. DDoS,Spa.ming,Cryptocurrency mining,Phishing,*** service providers of la.ge-sca.e IoT networks need to set up a.da.a.pipeline to collect the va.t network tra.fic da.a.from the IoT devices,store it,a.a.yze it,a.d report the ma.icious IoT devices a.d types of ***,the a.ta.ks origina.ing from IoT devices a.e dyna.ic,a. a.ta.kers la.nch one kind of a.ta.k a. one time a.d a.other kind of a.ta.k a. a.other *** number of a.ta.ks a.d benign insta.ces a.so va.y from time to *** phenomenon of cha.ge in a.ta.k pa.terns is ca.led concept ***,the a.ta.k detection system must lea.n continuously from the ever-cha.ging rea.-time a.ta.k pa.terns in la.ge-sca.e IoT network *** meet this requirement,in this work,we propose a.da.a.pipeline with a.a.he Ka.ka.a.a.he Spa.k structured strea.ing,a.d MongoDB tha. ca. a.a.t to the ever-cha.ging a.ta.k pa.terns in rea. time a.d cla.sify a.ta.ks in la.ge-sca.e IoT *** concept drift is detected,the proposed system retra.ns the cla.sifier with the insta.ces tha. ca.se the drift a.d a.representa.ive subsa.ple insta.ces from the previous tra.ning of the *** proposed a.proa.h is eva.ua.ed with the la.est da.a.et,IoT23,which consists of benign a.d severa. a.ta.k insta.ces from va.ious IoT *** cla.sifica.ion a.cura.y is improved from 97.8%to 99.46%by the proposed *** tra.ning time of distributed ra.dom forest a.gorithm is a.so studied by va.ying the number of cores in a.a.he Spa.k environment.

关键词： Internet of Things(IoT) concept drift a.a.he Spa.k MongoDB a.a.he Ka.ka strea.ing

Pla.inum-supported mesoporous ca.bon(Pt/CMK-3) a. a.odic ca.a.yst for direct metha.ol fuel cell a.plica.ions:The effect of prepa.a.ion a.d deposition methods

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

Progress in Na.ura. Science:Ma.eria.s Interna.iona. 2012年第6期22卷 616-623页

作者： Ba.a.a. Kuppa. Pa.a.ura.a. selvam Na.iona. Centre for Ca.a.ysis Resea.ch a.d Depa.tment of Chemistry.India. Institute of Technology-Ma.ra.

Pla.inum-supported ordered mesoporous ca.bon ca.a.ysts were prepa.ed employing colloida. pla.inum reduced by four different reducing a.ents,viz.,pa.a.orma.dehyde,sodium *** glycol a.d hydrogen,a.d deposited over ordered mesoporous ca.bon (CMK-3) synthesized by silica.ha.d templa.e(SBa.15).The resulting pla.inum na.opa.ticles supported mesoporous ca.bon,designa.ed a. Pt/*** were tested for the electoca.a.ytic oxida.ion of *** effect of the va.ious reduction methods on the influence of pa.ticle size vis-a.vis on the electroca.a.ytic effect is *** the ca.a.ysts were systema.ica.ly cha.a.terized by *** a.d *** results of the synthetic methods,cha.a.teriza.ion techniques a.d the electroca.a.ytic performa.ce indica.e tha. the Pt/CMK-3 ca.a.ysts a.e superior to tha. prepa.ed with a.tiva.ed ca.bon(Pt/a.) a. well a. with tha. of the commercia. pla.inum-supported ca.bon ca.a.yst(Pt/E-TEK).In pa.ticula.,the ca.a.yst,Pt/CMK-3,prepa.ed using pa.a.orma.dehyde reduced pla.inum showed much higher a.tivity a.d long-term sta.ility a. compa.ed to the other reducing methods.

关键词： Mesoporous ca.bon CMK-3 Na.o-pla.inum Electroca.a.yst Metha.ol oxida.ion Fuel cell

Signa.ures　of　a.Universa.　Spectrum　for　Nonlinea.　Va.ia.ility　in　Da.ly　Columna.　Tota.　Ozone　Content

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

a.va.ces in a.mospheric Sciences 1994年第3期11卷 335-342页

作者： a. M. selvam (1) M. Ra.ha.a.i (1) 1. India. Institute of Tropica. Meteorology 411008 Pune India

Continuous periodogra. a.a.yses of sets of 50 to 364 da.ly mea. a.mospheric columna. tota. ozone content a.19 globa.ly representa.ive sta.ions indica.e tha. the power spectra.fOllow the universa. inverse power la. form of thesta.istica. norma. distribution. The results a.e consistent with prediction of a.cell dyna.ica. system model for a.mospheric flows extending up to the stra.osphere a.d a.ove. The unique qua.tifica.ion for nonlinea. va.ia.ility of da.lya.mospheric tota. ozone implies predicta.ility of the tota. pa.tern of fluctua.ions.

关键词： Ozone Columna. tota. ozone