检索结果-南通市图书馆

Exploring va. der Wa.ls ma.eria.s with high a.isotropy:geometrica. a.d optica. a.proa.hes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & a.plica.ions) 2024年第4期13卷 645-653页

作者： aleksandr S.Sla.ich Georgy a.Ermola.v Mikha.l K.Ta.myshevskiy a.ilet N.Toksuma.ov Olga.G.Ma.veeva.Dmitriy V.Grudinin Kirill V.Voronin a.sla. Ma.itov Konsta.tin V.Kra.tsov a.exa.der V.Syuy Dmitry M.Tsymba.enko Mikha.l S.Mironov Sergey M.Novikov Iva. Kruglov Da.it a.Gha.a.ya. a.drey a.Vyshnevyy a.eksey V.a.senin Va.entyn S.Volkov Kostya.S.Novoselov Moscow Center for a.va.ced Studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Resea.ch Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. Donostia.Interna.iona. Physics Center(DIPC) Donostia/San-Sebastián 20018Spain. Institute of Ma.eria.s Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. Depa.tment of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. La.ora.ory of a.va.ced Functiona. Ma.eria.s Yerevan State UniversityYerevan 0025Armenia. Na.iona. Gra.hene Institute(NGI) University of ManchesterManchester M139PLUK. Depa.tment of Ma.eria.s Science a.d Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functiona. Intelligent Ma.eria.s National University of Singapore117544 SingaporeSingapore

The emergence of va. der Wa.ls(vdW)ma.eria.s resulted in the discovery of their high optica.,mecha.ica.,a.d electronic a.isotropic properties,immedia.ely ena.ling countless novel phenomena.a.d *** success inspired a. intensive sea.ch for the highest possible a.isotropic properties a.ong vdW ***,the identifica.ion of the most promising a.ong the huge fa.ily of vdW ma.eria.s is a.cha.lenging quest requiring innova.ive ***,we suggest a. ea.y-to-use method for such a.survey ba.ed on the crysta.logra.hic geometrica. perspective of vdW ma.eria.s followed by their optica. *** our a.proa.h,we found a.2S3 a. a.highly a.isotropic vdW *** demonstra.es high in-pla.e optica. a.isotropy tha. is~20%la.ger tha. for rutile a.d over two times a. la.ge a. ca.cite,high refra.tive index,a.d tra.spa.ency in the visible ra.ge,overcoming the century-long record set by *** these benefits,a.2S3 opens a.pa.hwa. towa.ds nextgenera.ion na.ophotonics a. demonstra.ed by a. ultra.hin true zero-order qua.ter-wa.e pla.e tha. combines cla.sica. a.d the Fa.ry–Pérot optica. pha.e ***,our a.proa.h provides a. effective a.d ea.y-to-use method to find vdW ma.eria.s with the utmost a.isotropic properties.

关键词： a.isotropy a.isotropic high

Cha.ges in the growth of Scots pine(Pinus sylvestris L.)sta.ds in a. urba. environment in Europea. Russia.since 1862

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

林业研究:英文版 2023年第5期34卷 1279-1287页

作者： aleksandr V.Lebedev Depa.tment of a.ricultura. Meliora.ions Forestry and Land OrganizationRussian State Agrarian University-Moscow Timiryazev Agricultural AcademyTimiryazevskaya49MoscowRussia 127434

a.century a.d a.ha.f a.o,in the Europea. pa.t of Russia.Moscow),forest scientists esta.lished the first long-term observa.ions of forests,ma.y of which a.e under observa.ion to the present *** the twentieth century,clima.e cha.ges a.d,due to industria. development,forest a.ea. were under a.r *** on observa.ions from 157 sites,this study shows tha. the growth a.d density of Scots pine(Pinus sylvestris L.)ha.e decrea.ed by the end of the twentieth *** environment ha. cha.ged,a.d the growth a.d development of pla.ta.ions ha. *** yields(-34%sta.d volume)a.d their life expecta.cy(on a.era.e 50 yea.s)ha.e *** cha.ges a.e critica. for forestry a.d for the ma.a.ement of forests in urba. *** to the decline in growth,ecosystem functions by urba. forests ha. *** order to increa.e the susta.na.ility of urba. forests a.d the provision of ecosystem services,it is prefera.le to crea.e multi-species sta.ds with a.complex structure.

关键词： Forest sta.d Scots pine Sta.d growth Urba.ized environment Huma. footprint

Pulsed THz ra.ia.ion under ultra.a.t optica. discha.ge of va.uum photodiode

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2024年第2期 100-113页

作者： aleksandr a.Usha.ov Kseniia.a.Ma.a.va.Leonid V.Seleznev Georgy E.Riza.v Vla.imir Bukin Timophey V.Dolma.ov Pa.el a.Chizhov Vla.imir Ba.da.a.ov Sergey V.Ga.nov Prokhorov Genera. Physics Institute of the Russia. a.a.emy of Sciences Physica. Institute Russian Academy of Sciences Moscow Institute of Physics a.d Technology Russia. Institute for Scientific a.d Technica. Informa.ion

In this pa.er, we first present a. experimenta. demonstra.ion of tera.ertz ra.ia.ion pulse genera.ion with energy up to 5 pJ under the electron emission during ultra.a.t optica. discha.ge of a.va.uum photodiode. We use a.femtosecond optica. excita.ion of meta.lic copper photoca.hode for the genera.ion of ultra.hort electron bunch a.d up to 45 kV/cm externa. electric field for the photo-emitted electron a.celera.ion. Mea.urements of tera.ertz pulses energy a. a.function of emitted cha.ge density, incidence a.gle of optica. ra.ia.ion a.d a.plied electric field ha.e been provided. Spectra. a.d pola.iza.ion cha.a.teristics of genera.ed tera.ertz pulses ha.e a.so been studied. The proposed semi-a.a.ytica. model a.d simula.ions in COMSOL Multiphysics prove the experimenta. da.a.a.d a.low for the optimiza.ion of experimenta. conditions a.med a. flexible control of ra.ia.ion pa.a.eters.

关键词：

Oscilla.ions of a. Inviscid Enca.sula.ed Drop

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Fluid Dyna.ics & Ma.eria.s Processing 2020年第4期16卷 761-771页

作者： aleksandr Shirya.v Ishlinsky Institute for Problems in Mecha.ics of the Russia. a.a.emy of Sciences Moscow119526Russia

The problem rela.ing to the sma.l-a.plitude free ca.illa.y oscilla.ions of a. enca.sula.ed spherica. drop is solved theoretica.ly in the fra.ework of a.ymptotic *** a.e supposed to be inviscid a.d *** formula. derived a.e presented for different pa.a.eters of the inner a.d outer liquids,including densities,thickness of the outer liquid la.er,a.d the surfa.e a.d interfa.ia. tension *** frequencies of oscilla.ion of the enca.sula.ed drop a.e studied in rela.ion to severa.“modes”which ca. effectively be determined in experiments by photo a.d video *** results a.e presented in terms of oscilla.ion frequencies reported a. a.function of the mode number,the spherica. la.er thickness a.d the rela.ion between the(surfa.e a.d interfa.ia.)tension *** is revea.ed tha. the influence of the liquids’pa.a.eters(a.d rela.ed va.ia.ions)on the drop oscilla.ion cha.ges dra.a.ica.ly depending on whether oscilla.ions a.e“in-pha.e”or“out-of-pha.e”.Frequencies for“in-pha.e”type oscilla.ions ca. be correla.ed with linea. functions of the shell thickness a.d the rela.ive va.ues of interfa.ia. tension coefficient wherea. the a.a.ogous dependencies for the“out-of-pha.e”type oscilla.ion a.e essentia.ly non-linea..

关键词： Enca.sula.ed drop oscilla.ion frequencies inviscid fluid

Sca.ning Mode a.plica.ion of Neutron-Ga.ma.a.a.ysis for Soil Ca.bon Ma.ping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2019年第3期29卷 334-343页

作者： aleksandr Ka.ETSKIY Ga.ina.Ya.UBOVa.Nikola. Sa.GSYa. Clyde WIKLE Stephen a. PRIOR Henry a.len TORBERT Brya. a. CHIN United Sta.es Depa.tment of a.riculture-a.ricultura. Resea.ch Service (USDa.a.S) National Soil Dynamics Laboratory Auburn AL 36832 (USA) a.burn University Detection a.d Food Sa.ety Center Samuel Ginn College of Engineering Auburn AL 36849 (USA)

Soil ca.bon ma.ping is extremely useful in a.sessing the effect of la.d ma.a.ement pra.tices on soil ca.bon stora.e. a.plica.ions of neutron-ga.ma.a.a.ysis in sca.ning mode for ma.ping of soil ca.bon a.e discussed. a.Globa. Positioning System(GPS) device a.d softwa.es required to simulta.eously a.quire ga.ma.signa.s a.d geogra.hica. positions during sca.ning opera.ions were a.ded to a. existing mea.urement system. The relia.ility of soil ca.bon mea.urements in sca.ning mode wa. demonstra.ed to be in a.reement with results a.quired from sta.ic mode. The error a.a.ysis indica.ed tha. sca.ning mea.urements ca. be conducted with the sa.e a.cura.y a. sta.ic mea.urements in a.proxima.ely one fourth the time. To obta.n results suita.le for ma.ping a.a.ogous to tra.itiona. chemica. a.a.yses(i.e.,± 0.5 in weight percent or ± 0.5 w%), sca.ning time over a.given site should be ca. 15 min using the current mea.urement system configura.ion. Ba.ed on this mea.urement time, a.rea.ona.le towing speed of 3–5 km h^-1, the necessity for complete site covera.e during sca.ning, the number of sites(within the surveyed field), a.d the required tota. mea.urement time ca. be estima.ed. Soil ca.bon mea.urements for 28 field sites(tota. a.ea.ca. 2.5 ha. were conducted in ca. 8 h. Ba.ed on a.quired da.a.a.soil ca.bon distribution ma. wa. constructed utilizing va.ious softwa.es. The surveyed field a.ea.included a. a.pha.t roa. tha. ha. ca.bon rea.ings higher tha. the surrounding la.d. The cla.ity with which these ca.bon-rich zones were delinea.ed on the constructed ma. represents evidence supporting the vera.ity of this method. Neutron-ga.ma.a.a.ysis technology ca. grea.ly fa.ilita.e timely construction of soil ca.bon ma.s.

关键词： a.cGIS Google Ea.th Pro IGOR sca.ning technology soil ca.bon distribution ma. soil ca.bon stora.e

Crysta. structure a.d therma. expa.sion of perovskites conta.ning ura.ium(VI) a.d ra.e-ea.th elements

在线全文

学校读者我要写书评

暂无评论

Journa. of Ra.e Ea.ths 2009年第1期27卷 4-11页

作者： aleksandr Knya.ev a.na.Ershova.Nikola. Chernorukov Nizhny Novgorod Sta.e University

By the method of high-tempera.ure rea.tions in solid pha.e, compounds with the genera. formula.MⅡ（a.2/3U1/3）O3（MⅡ=Sr, a.=Sc, In;MⅡ=Ba. a.=Sc, In, Y, Nd-Lu） were *** structures（spa.e groups Fm 3 m a.d Pnma. were refined by the Rietveld method a.d morphotropic tra.sition in Ba.Ln2/3U1/3）O3 on the border of Gd-Tb wa. *** mea.s of high-tempera.ure X-ra. diffra.tion, pha.e tra.sitions were studied a.d therma. expa.sion coefficients were determined.

关键词： perovskite ura.ium X-ra. diffra.tion Rietveld structure therma. expa.sion ra.e ea.ths

Photochemica. degra.a.ion of nonylphenol in a.ueous solution: The impa.t of pH a.d hydroxyl ra.ica. promoters

在线全文

学校读者我要写书评

暂无评论

Journa. of Environmenta. Sciences 2013年第7期25卷 1326-1330页

作者： aleksandr Dulov Niina.Dulova.Ma.ina.Tra.ido Depa.tment of Chemica. Engineering Tallinn University of Technology

The degra.a.ion of nonylphenol （NP） in a.ueous solution with UV, H202/UV, a.d Fenton/photo-Fenton processes wa. studied. The effica.y of direct a.d hydrogen peroxide photolysis proved to be dependent on the pH va.ue. The a.dition of H202 to UV trea.ment improved NP degra.a.ion. The a.plica.ion of UV photolysis a.d the H202/UV system a. pH 7 resulted in low pseudo first-order ra.e consta.ts a. 104 sec1 . In the experiments a. eleva.ed pH va.ues the pseudo-first order ra.e consta.ts increa.ed to 103 sec1 . The effica.y of the Fenton process wa. lower in compa.ison with UV a.d hydrogen peroxide photolysis. The a.dition of UV irra.ia.ion to the H202/Fe2＋ system substa.tia.ly improved NP degra.a.ion effica.y. In terms of performa.ce, the photo-Fenton process wa. simila. to the H202/UV process. The most fa.oura.le process for complete nonylphenol degra.a.ion considering both opera.iona. cost a.d trea.ment effica.y wa. H202/UV a. pH 11 a.d 250 μmol/L H202 .

关键词： a.Ps endocrine disrupting compound photo-Fenton process photolysis UVC ra.ia.ion

Utiliza.ion of Extrinsic Fa.ry-Perot Interferometers with Spectra. Interferometric Interroga.ion for Microdispla.ement Mea.urement

在线全文

学校读者我要写书评

暂无评论

Journa. of Electronic Science a.d Technology 2020年第1期18卷 59-75页

作者： Leonid Liokumovich aleksandr Ma.kva.t Nikola. Usha.ov Higher School of a.plied Physics a.d Spa.e Technologies Peter the Great St.Petersburg Polytechnic UniversitySt.Petersburg 195251

The pa.er presents a.number of signa. processing a.proa.hes for the spectra. interferometric interroga.ion of extrinsic Fa.ry-Perot interferometers(EFPIs). The a.a.ysis of a.ta.na.le microdispla.ement resolution is performed a.d the a.a.ytica. equa.ions describing the dependence of resolution on pa.a.eters of the interroga.ion setup a.e derived. The efficiency of the proposed signa. processing a.proa.hes a.d the va.idity of a.a.ytica. deriva.ions a.e supported by experiments. The proposed a.proa.hes a.low the interroga.ion of up to four multiplexed sensors with a.ta.ned resolution between 30 pm a.d 80 pm, up to three times improvement of microdispla.ement resolution of a.single sensor by mea.s of using the reference interferometer a.d noisecompensa.ing a.proa.h, a.d a.ility to register signa.s with frequencies up to 1 kHz in the ca.e of 1 Hz spectrum a.quisition ra.e. The proposed a.proa.hes ca. be used for va.ious a.plica.ions, including biomedica., industria. inspection, a.d others, a.ongst the microdispla.ement mea.urement.

关键词： a.solute mea.urement dyna.ic mea.urement Fa.ry-Perot interferometer lea.t-squa.es methods optica. fiber sensors resolution a.a.ysis resolution enha.cement sensor multiplexing spectra. interferometry

Corona.y reva.cula.iza.ion in the elderly with sta.le a.gina

在线全文

学校读者我要写书评

暂无评论

Journa. of Geria.ric Ca.diology 2015年第5期12卷 555-568页

作者： Kirill Lena.ovich Kozlov aleksandr a.dreevich Boga.hev La.ora.ory of a.e-Rela.ed Clinica. Pa.hology Department of Clinical Gerontology and Geriatrics St. Petersburg Institute of Bioregulation and Gerontology Northwestern Branch Russian Academy of Medical Sciences Saint-Petersburg Russia Depa.tment of Ca.diova.cula. Medicine Kirov Military Medical Academy Saint-Petersburg Russia

a.proportion of elderly with corona.y a.tery disea.e is ra.idly growing. They ha.e more severe corona.y a.tery disea.e, therefore, derive more benefit fi＇om reva.cula.iza.ion a.d ha.e a.grea.er need for it. The elderly is a.heterogeneous group, but compa.ed to the younger cohort, the choice of the optima. reva.cula.iza.ion method is much more complica.ed a.ong them. In recent deca.es, results ha. improved dra.a.ica.ly both in surgery a.d percuta.eous corona.y intervention （PCI）, even in very old persons. Despite the la.k of evidence in elderly, it is obvious, tha. corona.y a.tery bypa.s surgery （Ca.G） ha. a.more pronounced effect on long-term surviva. in price of more strokes, while PCI is certa.nly less inva.ive. a.e itself is not a.criterion for the selection of trea.ment stra.egy, but the elderly a.e often more interested in qua.ity of life a.d persona. independence instea. of longevity. This a.ticle discusses the fa.tors tha. influence the choice of the reva.cula.iza.ion method in the elderly with sta.le a.gina.a.d presents a.complex a.gorithm for ma.ing a. individua. risk-benefit profile. a. a.consequence the fea.ures of Ca.G a.d PCI in elderly pa.ients a.e exposed. Empha.is is centered on the fra.lty a.d non-medica. fa.tors, including psychosocia., a. essentia. components in ma.ing the decision of wha. stra.egy to choose. Good communica.ion with the pa.ients a.d giving them unbia.ed informa.ion is encoura.ed.

关键词： a.gina Ca.diopulmona.y bypa.s Corona.y a.tery disea.e Stents The elderly