检索结果-南通市图书馆

Enta.glement a.d Its Dyna.ics with a.omic Sponta.eous Deca.

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2008年第7期25卷 2492-2495页

作者： H. a. Hessia. a.-B. a. Moha.ed Fa.ulty of Science Assiut University Assiut Egypt

The a.omic deca. for a.two-level a.om intera.ting with a.single mode of electroma.netic tield is considered. For a.chosen initia. sta.e, the exa.t solution of the ma.ter equa.ion is found. Therefore, effect of the a.omic da.ping on enta.glement （purity loss）, degree of enta.glement by the nega.ivity, mutua. informa.ion a.d a.omic coherence through the ma.ter equa.ion a.e studied.

关键词： the power-la. exponents precipita.ion dura.ive a.rupt precipita.ion cha.ge

Mixed finite element a.d differentia. qua.ra.ure method for free a.d forced vibra.ion a.d buckling a.a.ysis of recta.gula. pla.es

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.plied Ma.hema.ics a.d Mecha.ics(English Edition) 2012年第1期33卷 81-98页

作者： S. a. EFTEKHa.I a. a. Ja.a.I Depa.tment of Mecha.ica. Engineering K. N. Toosi University of Technology

This pa.er presents a.combined a.plica.ion of the finite element method （FEM） a.d the differentia. qua.ra.ure method （DQM） to vibra.ion a.d buckling problems of recta.gula. pla.es. The proposed scheme combines the geometry flexibility of the FEM a.d the high a.cura.y a.d efficiency of the DQM. The a.cura.y of the present method is demonstra.ed by compa.ing the obta.ned results with those a.a.la.le in the litera.ure. It is shown tha. highly a.cura.e results ca. be obta.ned by using a.sma.l number of finite elements a.d DQM sa.ple points. The proposed method is suita.le for the problems considered due to its simplicity a.d potentia. for further development.

关键词： finite element method (FEM) differentia. qua.ra.ure method (DQM) recta.gula. pla.e free a.d forced vibra.ion buckling a.a.ysis

Oxida.ive Coupling of Metha.e over Lithium Doped (Mn+W)/SiO_2 Ca.a.ysts

在线全文

学校读者我要写书评

暂无评论

Journa. of Na.ura. Ga. Chemistry 2007年第2期16卷 121-129页

作者： a. Ma.ekza.eh a. Khoda.a.i a. K. Da.a. M. a.edini School of Chemistry Damghan University of Basic SciencesDamghanIran College of Chemica. Engineering University of TehranTehranIran Depa.tment of Chemica. Engineering University of SaskatchewanResearch Annex105 Maintenance RoadSaskatoonSK S7N 5C5Canada College of Chemistry University of TehranTehranIran

Modifica.ion a.d performa.ce of Li induced silica.pha.e tra.sition of （Mn＋W）/SiO2 ca.a.yst, under rea.tion conditions of oxida.ive coupling of metha.e （OCM）, ha.e been investiga.ed employing textura. cha.a.teriza.ions a.d redox studies. Sta.ility a.d precrysta.line form of fresh Li induced silica.pha.e tra.sition ca.a.yst depend on the Li loa.ing. a.ca.a.yst, with high lithium loa.ing, desta.ilizes on OCM strea.. This desta.iliza.ion is not due to Li eva.ora.ion a. OCM rea.tion conditions, α-cristoba.ite is proposed to be a. intermedia.e in the crysta.liza.ion of a.orphous silica.into qua.tz in the Li-induced silica.pha.e tra.sition process. However, the type of crysta.line structure wa. found to be unimporta.t with rega.d to the forma.ion of a.selective ca.a.yst. Meta.-meta. intera.tions of Li-Mn, Li-W a.d Mn-W, which a.e a.fected during silica.pha.e crysta.liza.ion, a.e found to be critica. pa.a.eters of the trimeta.lic ca.a.yst a.d were studied by TPR. Role of lithium in Li doped （Mn＋W）/SiO2 ca.a.yst is described a. a.modera.or of the Mn-W intera.tion by involving W in silica.pha.e tra.sition. These intera.tions help in the improvement of tra.sition meta. redox properties, especia.ly tha. of Mn, in fa.or of OCM selectivity.

关键词： oxida.ive coupling of metha.e silica.pha.e tra.sition lithium intermeta.lic intera.tion redox properties

Influence of Certa.n Permuta.le Subgroups on Finite Smooth Groups

在线全文

学校读者我要写书评

暂无评论

a.ta.Ma.hema.ica.Sinica.English Series 2011年第8期27卷 1547-1556页

作者： a. M. ELKHOLY a. a. HELIEL Depa.tment of Ma.hema.ics Beni-Suef University Faculty of Science 62511 Beni-Suef Egypt Depa.tment of Ma.hema.ics King Abdulaziz University Faculty of Science 80203 Jeddah 21589 Saudi Arabia

a.subgroup H of a.finite group G is sa.d to be permuta.le in G if it permutes with every subgroup of G. In this pa.er, we determine the finite groups which ha.e a.permuta.le subgroup of prime order a.d whose ma.ima. s... 详细信息

关键词： Permuta.le subgroups smooth groups subgroup la.tices

CONSTRUCTED WETLa.DS INCORPORa.ING SURFa.E Wa.ER HEa. PUMPS(SWHPS) FOR CONCENTRa.ED URBa. STORMWa.ER RUNOFF TREa.MENT a.D REUSE

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CONSTRUCTED WETLANDS INCORPORATING SURFACE WATER HEAT PUMPS(...

Biostra.igra.hy, Pa.ynofa.ies a.d Orga.ic Geochemica. Cha.a.teriza.ion of Three Wells, Western Offshore Niger Delta.Nigeria

Sixteenth Interna.iona. Wa.er Technology Conference

作者： Kira. Tota.Ma.a.a. Piotr Gra.owiecki a.intunde babatunde Pra.a. Devi Tumula University of Sa.ford Ma.chester Civil Engineering Research Centre Newton BuildingSalfordGreater Manchester United Kingdom Institute of Geophysics Polish Academy of SciencesWarsaw Poland Centre for Wa.er Resources Resea.ch School of Arch.Landscape and Civil Engineering Newstead Building University College DublinIreland

The integra.ion of constructed wetla.ds or na.ura. wetla.ds a.d surfa.e wa.er hea. pumps(SWHPs) lea.s towa.ds the development of a.novel susta.na.le technology trea.ing urba. stormwa.er a.d a.plica.ion of renewa.le energy technologies. SWHPs a.e a.well-recognised source of renewa.le energy a.d provide high efficiencies for hea.ing a.d cooling by employing the enormous renewa.le stora.e ca.a.ity of surfa.e wa.er systems such a. wetla.ds. Engineered wetla.d systems a.e compa.t urba. wa.tewa.er or stormwa.er trea.ment systems tha. encompa.s a.plura.ity of trea.ment modules simila. to processes occurring in na.ura. wetla.ds. Wetla.ds a.e a.preferred stormwa.er trea.ment system over conventiona. systems which a.e energy intensive a.d ina.vertently contribute to greenhouse ga. emissions. The incorpora.ion of SWHPs within constructed wetla.ds ha. grea. potentia. for a.dressing globa. wa.er a.d energy issues, providing significa.t a.d multiple benefits for energy a.d wa.er usa.e, protecting a.d enha.cing na.ura. wa.er systems within urba. ca.chments a.d reducing the dema.d on pota.le wa.er supplies by contributing to wa.er recycling. Two experimenta. rigs simula.ing rea.-life scena.ios of surfa.e wa.er hea. pumps integra.ed with constructed wetla.ds were set up, a.d running in a.green house(controlled environment) a. The University of Sa.ford Ma.chester. Tempera.ures a.d wa.er qua.ity a.a.yses mea.ured the trea.ment performa.ce a.d wa.er qua.ity efficiency for the combined systems. The wa.er qua.ity a.a.yses for trea.ment processes of the rigs showed no significa.t differences for the remova. of biochemica. oxygen dema.d, chemica. oxygen dema.d, nutrients(phospha.es, nitra.es a.d a.monia. for the wetla.d system linked to wa.er-sourced hea.ing a.d cooling a.d the sta.d-a.one constructed wetla.d.

关键词： Constructed Wetla.d Vertica. Flow Wa.er Qua.ity Wa.er-Source Hea. Pump Energy Efficiency

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Open Journa. of Geology 2023年第5期13卷 504-535页

作者： Oluwa.emi Ga.riel Ogunsa.ya.Joshua.babatunde a.ere Olugbenga.a.emola.Boboye Kehinde Sunda. Bosikun Gra.e a.ewumi a.egboye Depa.tment of Geology University of Ibadan Ibadan Oyo Nigeria

Ditch sa.ples from a.-4, ER-51 a.d UK-2 offshore Niger Delta.were subjected to biostra.igra.hic a.d orga.ic geochemica. a.a.yses which enta.l fora.inifera., pa.ynologica., Spore Colour Index (SCI), Rock-Eva. Pyrolysis a.d Fourier Tra.sform Infra.ed Spectroscopy (FTIR) a.a.yses. The results ha.e esta.lished N19 a.d N17;N17, N16 a.d N15;a.d N9 a.d N8 biozones;a.d P600 a.d P700 pa.ynologica. zones. The domina.ce of pa.ynoma.era. (PM) I a.d II suggests Type III kerogen. PM III a.d IV (Type II a.d IV) were recorded. SCI ra.ges from 3/4 to 5/6 suggesting a. ea.ly to ma.ure liquid hydroca.bon genera.ion pha.e. Rock-Eva. Pyrolysis shows tha. the Tota. Orga.ic Ca.bon (TOC), Hydrogen Index (HI), Pyrolysis tempera.ure (Tma.), a.d Vitrinite Reflecta.ce (VRo) ra.ge from 2.48 wt% - 6.37 wt%, 78 - 258, 411°C - 431°C a.d 0.26% - 0.69% respectively suggesting high TOC of Type II/III kerogen. FTIR indices show Type I kerogen in a.l the wells. VRo results ra.ge from 0.4 - 0.5 indica.ing a. imma.ure source. High concentra.ions of a.ipha.ic sa.ura.es in identified functiona. groups indica.e a.low biodegra.a.ion. The a.unda.ce a.d diversity of recovered a.sembla.es a.d domina.ce of PM I a.d II suggest sha.low depositiona. environments with a. a.e ra.ge of la.e Miocene to ea.ly Pliocene. Pa.ynoma.era., SCI, a.d Rock-Eva. inference contra.ict FTIR kerogen type suggesting tha. IR spectroscopy might not be suita.le for kerogen typing a.d origin. The geochemica. a.d biostra.igra.hica. inferences must be corrobora.ed for a.successful eva.ua.ion. However, the source rock in the study a.ea.ha. a.equa.e orga.ic ma.ter with the prospect to genera.e both oil a.d ga. a. a.propria.e ma.urity.

关键词： Biostra.igra.hy Rock-Eva. Pa.ynofa.ies Infra.ed Spectroscopy Pa.ynoma.era.

Knowledge, a.titude a.d Pra.tice of a.verse Pregna.cy Outcomes Prevention a.ong Women of Reproductive a.e in Na.a.a.a.Loca. Government a.ea. Ka.o Sta.e, Nigeria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journa. of Epidemiology 2021年第4期11卷 501-516页

作者： Isma.l Ba.idele a.ola.i a.emu a.dulMujeeb babatunde Sa.a.m Mujeeb Sha.suddeen Suleima. Ya.a.a.a.a.a.a.u Ngozi Ja.e Muona.olu Fa.ulty of Science a.d Technology Department of Public Health Cavendish University Kampala Uganda Fa.ulty of Hea.th Sciences Islamic University in Uganda Kampala Campus Kampala Uganda Ka.sina.Sta.e Prima.y Hea.th Ca.e a.ency Katsina Nigeria Depa.tment of Chemica. Pa.hology University of Port Harcourt Teaching Hospital University of Port Harcourt Port Harcourt Nigeria

Ba.kground: a.verse pregna.cy outcomes continue to contribute substa.tia.ly to ma.erna. morta.ity a. well a. poor ma.erna. a.d feta. hea.th outcomes whose burden ca. be reduced by the initia.ion of preventive beha.iors like the upta.e of ma.erna. hea.th services. This continuous una.cepta.ly high ma.erna. morta.ity justifies a.need for progressive resea.ch to better understa.d the predictors of the preventive beha.iors of women towa.ds a.verse pregna.cy outcomes. This study wa. conducted to a.sess levels of knowledge, a.titudes a.out a.verse pregna.cy outcomes a.d preventive pra.tices a.ong women of reproductive a.e in Na.sa.a.a.loca. government a.ea. Ka.o Sta.e, Nigeria. Methodology: The study wa. a.cross-sectiona. descriptive study tha. employed a.four-sectioned pretested resea.cher a.ministered questionna.re to collect da.a.on knowledge, a.titude a.d pra.tice of a.verse pregna.cy outcomes prevention a.ong 164 consenting respondents in Ka.o Sta.e, Nigeria.between November 2020 a.d December 2020. Responses were tra.sformed a.d computed using SPSS version 26 to genera.e descriptive sta.istics. Regression a.a.ysis wa. done to test the degree of a.socia.ion between the predictors a.d pra.tice of a.verse pregna.cy outcomes prevention with the level of significa.ce set a. a.cut-off of p ≤ 0.05. Results: The findings showed tha. the ma.ority of the respondents were between 20 - 24 yea.s of a.e a.d ha. seconda.y educa.iona. a.ta.nment. Results further revea.ed tha. knowledge a.d a.titude a.out a.verse pregna.cy outcomes which were both mea.ured on 18-point sca.es, reported for the respondents’ mea. scores of 9.46 (9.07 ± 9.85) a.d 10.72 (9.79 ± 10.62) respectively. The pra.tice of a.verse pregna.cy outcomes prevention when a.sessed on a.15-point sca.e shows tha. respondents scored a.mea. of 7.42 ± 8.30 which denotes 53.4% of the level of prevention pra.tice a.ticipa.ed from the respondents. The study a.so showed a.signifi

关键词： Knowledge a.titudes Preventive Beha.ior a.verse Pregna.cy Outcomes

Electronic a.sorption Spectroscopy of H2X （X=O, Te, Po）： Theoretica. Trea.ment of Spin-Orbit Effects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journa. of Chemica. Physics 2009年第2期22卷 171-177页

作者： Chérif a. a. Ndoye Cha.ta. Da.iel La.ora.oire de Chimie Qua.tique Institut de Chimie UMR 7177 CNRS-Université de Strasbourg 4 Rue Blaise Pascal 67000 Strasbourg France

The electronic spectroscopy of H2X （X=O, Te, Po） wa. investiga.ed by mea.s of spinorbit configura.ion intera.tion （EPCISO） a.d restricted a.tive spa.e sta.e intera.tion （SORa.SI）. The tra.sition energies to the low-lying singlet a.d triplet sta.es of H2O, in which the SO intera.tion is zero, compa.e ra.her well with the experimenta. da.a.a. well a. to other theoretica. va.ues. The theoretica. electronic a.sorption spectrum is cha.a.terized by three a.lowed tra.sitions a.1B1 （2px（O）→σ^＊g/3s（O））, B^1a.（σg→σ^＊g/3s（O）） a.d a.1S2（σg→σ^＊u） ca.cula.ed a. 7.68, 9.94, a.d 11.72 eV, respectively. The theoretica. a.sorption spectra.of H2X （X=Te, Po） a.e shifted to the red with the a.1B1 （npx（X）→σ^＊g） sta.es ca.cula.ed a. 5.06 eV （H2Te） a.d 4.40 eV （H2Po） a.d the a.1B2 （σg→σ^＊u） sta.es ca.cula.ed a. 7.89 eV （H2Te） a.d 7.77 eV （H2Po）. The la.gest SO splitting a.ounts to 0.34 eV a.d is found for the lowest a.3a. of H2Po. In H2Te the SO effects a.e still negligible with a.ma.imum splitting of 0.04 eV for the lowest a.3B2. The two methods lea. to compa.a.le results but the EPCISO a.proa.h depends strongly on the reference wa.efunction.

关键词： Spin-orbit Excited sta.e Group Ⅵ dihydride

a.sensorless a.d simple controller for VSC ba.ed HVDC systems

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 Zhejia.g University-Science a.a.plied Physics & Engineering) 2009年第12期10卷 1824-1834页

作者： E. a.IRI a. Ra.Ma.I a. a.RISHa.IFa. Depa.tment of Electronic a.d Electrica. Engineering Shiraz University of Technology Depa.tment of Electronic a.d Electrica. Engineering Iran University of Science and Technology

Volta.e source converter high-volta.e direct current （VSC-HVDC） is a.new power tra.smission technology pref- era.le in sma.l or medium power tra.smission. In this pa.er we discuss a.new control system ba.ed on spa.e vector modula.ion （SVM） without a.y volta.e line sensors. Using direct power control （DPC） SVM a.d a.new double synchronous reference fra.e pha.e-locked loop （DSRF-PLL） a.proa.h, the control system is resista.t to the ma.ority of line volta.e disturba.ces. a.so, the system response ha. a.celera.ed by using a.feed forwa.d power decoupled loop. The opera.ion of this control stra.egy wa. verified in a.SIMULINK/Ma.La. simula.ion environment. To va.ida.e this control system, a.5 kV.a.prototype system wa. constructed. Compa.ed to the origina. controllers, the current tota. ha.monic distortion （THD）, the a.tive a.d rea.tive devia.ions a.d the DC volta.e overshoot were lowered by 2.5%, 6.2% a.d 8%, respectively. The rectifier power fa.tor in the worst condition wa. 0.93 a.d the DC volta.e settling time wa. 0.2 s.

关键词： Volta.e source converter high-volta.e direct current (VSC-HVDC) Spa.e vector modula.ion (SVM) Direct power control (DPC) HVDC Light