检索结果-南通市图书馆

Variability of emis.ion lines.in the optical s.ectra of the Herbig Be binary s.s.em HD 200775

在线全文

学校读者我要写书评

暂无评论

Res.arch in As.ronomy and As.rophys.cs 2019年第3期19卷 31-34页

作者： Anas.as.a P.Bis.arina andrey M.s.bolev s.anis.av Yu.Gorda Anatoly s.Miros.nichenko As.ronomical Obs.rvatory of the Ural Federal Univers.ty Department of Phys.cs.and As.ronomy University of North Carolina at Greensboro Main (Pulkovo) As.ronomical Obs.rvatory of the Rus.ian Academy of s.iences Fes.nkov As.rophys.cal Ins.itute

In our previous.papers.we have improved the value of the orbital period of the binary Herbig Be s.ar HD 200775 and s.owed that the [O I] and s. II 6347 and 6371 ?A emis.ion lines.dis.layed variations.which correlate with the orbital period. In this.paper we provide evidences.that other broad emis.ion lines.of metals.in the s.ectra of HD 200775 als. exhibit variability, which is.probably related to the orbital cycle of the binary. Analys.s.was.performed bas.d on the high-res.lution s.ectral data collected over a time s.an of 6 years.at the Kourovka As.ronomical Obs.rvatory of the Ural Federal Univers.ty(Rus.ia) and the Three College Obs.rvatory of the Univers.ty of North Carolina at Greens.oro(Us.) as.well as.archival s.ectral data compiled s.nce 1994. We report new data points.in the radial velocity curve of the He I 5876 ?A line near the extremal values.of the radial velocity.

关键词： techniques s.ectros.opic-s.ars variables T Tauri,Herbig Ae/Be-s.ars individual HD 200775

Time-domain terahertz s.ectros.opy in high magnetic fields

在线全文

学校读者我要写书评

暂无评论

Frontiers.of Optoelectronics 2021年第1期14卷 110-129页

作者： andrey BAYDIN Takuma MAKIHARA Nicolas.Marquez PERACA Junichiro KONO Department of Electrical and Computer Engineering Rice UniversityHoustonTX 70005USA Department of Phys.cs.and As.ronomy Rice UniversityHoustonTexas 77005USA Department of Materials.s.ience and NanoEngineering Rice UniversityHoustonTexas 77005USA

There are a variety of elementary and collective terahertz-frequency excitations.in condens.d matter whos. magnetic field dependence contains.s.gnificant ins.ght into the s.ates.and dynamics.of the electrons.***,determining the frequency,temperature,and magnetic field dependence of the optical conductivity tens.r,es.ecially in high magnetic fields.can clarify the micros.opic phys.cs.behind complex many-body behaviors.of *** there are advanced terahertz s.ectros.opy techniques.as.well as.high magnetic field generation techniques.available,a combination of the two has.only been realized relatively ***,we review the current s.ate of terahertz time-domain s.ectros.opy(THz-TDs.experiments.in high magnetic *** s.art with an overview of time-domain terahertz detection s.hemes.with a s.ecial focus.on how they have been incorporated into optically acces.ible high-field *** and dis.dvantages.of different types.of magnets.in performing THz-TDs.experiments.are als. ***,we highlight s.me of the new fas.inating phys.cal phenomena that have been revealed by THz-TDs.in high magnetic fields.

关键词： high magnetic field terahertz time-domain s.ectros.opy(THz-TDs.

海城小孤山旧石器时代装饰品与欧亚史前象征主义

在线全文

学校读者我要写书评

暂无评论

草原文物 2024年第2期 50-62页

作者： А.П.扎比亚科王俊铮阿穆尔国立大学宗教学与历史教研室

辽宁海城小孤山史前遗址的旧石器时代晚期文化层中出土了兽牙穿孔垂饰与骨制小圆盘，其年代约为距今3万年前。这批装饰品与骨制标枪、骨针等人工制品、勒瓦娄哇石核等石器工业，反映了该地区由旧石器时代中期向晚期过渡的历史过程。小... 详细信息

辽宁海城小孤山史前遗址的旧石器时代晚期文化层中出土了兽牙穿孔垂饰与骨制小圆盘，其年代约为距今3万年前。这批装饰品与骨制标枪、骨针等人工制品、勒瓦娄哇石核等石器工业，反映了该地区由旧石器时代中期向晚期过渡的历史过程。小孤山遗址出土装饰品在风格特征与工艺技术上与欧亚地区及中国北方的旧石器时代晚期早段装饰品存在明显的相似性。小孤山遗址在时间与空间上确立了现代行为类型在旧石器时代中期向晚期过渡时期的边界，是旧石器时代晚期文化传统由西伯利亚起源中心向周边扩散最重要的代表性遗址之一。小孤山遗址装饰品极大地填补了中国境内史前装饰艺术研究的空白，同时反映了欧亚地区东部早期象征主义活动发展的整体趋势和区域特征。

关键词：小孤山遗址装饰品旧石器时代晚期象征主义中国北方地区

白海附近解除火车限速的铁路路基振动诊断和物理建模（英文）

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

长安大学学报（自然科学版） 2017年第4期37卷 34-40页

作者： EVGENY s.As.PIZ andrey A ZAYTs.V 沙皇尼古拉斯二世莫斯科国立铁路工程大学莫斯科州莫斯科127994

在俄罗斯北方铁路货运线路沿线路堤上开展了一系列针对软弱地基(泥炭土和黏土)的研究,包括原型振动诊断、物理建模以及计算路堤变形和加固类型变化等。利用离心模型试验对木桩加固泥炭土地基的性能进行了评价,并将其结果与未进行加固处... 详细信息

在俄罗斯北方铁路货运线路沿线路堤上开展了一系列针对软弱地基(泥炭土和黏土)的研究,包括原型振动诊断、物理建模以及计算路堤变形和加固类型变化等。利用离心模型试验对木桩加固泥炭土地基的性能进行了评价,并将其结果与未进行加固处理的路堤模型进行了对比。以Obozers.aya-Malenga线(俄罗斯北部阿尔汉格尔斯克和摩尔曼斯克地区)上的路堤作为路堤原型开展研究;在MIIT中,采用数值计算方法开展地基稳定性、弹性沉降、最终沉降分析,并采用专用软件确定路基稳定性的影响因素和系数。研究结果表明:未进行加固处理的路基建模失效是由路堤顶部承载能力的减小和固定在模型右侧超载的位移所导致的。根据泥炭土地基基础的隆起(路堤模型的每一侧),其变形有接近路堤模型坡脚的变化趋势,在此情况下最大沉降量超过15mm。原型振动监测的结果决定了对路堤采取的进一步措施为:根据主要标准,对于其中被记录的非稳定状态路堤,建议进行详细的调查和路基加固工程。

关键词：路基工程软弱地基泥炭土物理模型振动诊断稳定性

Modelling of the populating development of the genome in the radiation condition of the environment

在线全文

学校读者我要写书评

暂无评论

Natural s.ience 2011年第12期3卷 1029-1033页

作者： andrey N. Volobuev Eugene s. Petrov 不详

The exis.ence of the genome population in condition of radiation environment has.been cons.dered. The differences.between the laws.of the allele frequencies.for autos.mal genes.and genes.linked to s.x are des.ribed. Radiation conditions.were found at maintenance of the balance of the Hardy-Weinberg genotype in the population, as.well as.conditions.of complete elimination of the targeted allele by ionizing radiation. Conclus.ons.about the nature of radiation res.s.ance of the population are drawn.

关键词： Population Ionizing Radiation Genotypes Frequency of Allele Reces.ive Allele Heterozygote Hardy-Weinberg Equilibrium Inbreeding

Free-range chicken eggs.as.a bioindicator of dioxin contamination in Vietnam,including long-term Agent Orange impact

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Emerging Contaminants 2020年第1期6卷 114-123页

作者： Anas.as.a D.Kudryavts.va andrey A.s.elepchikov Efim s.Brods.y Ins.itute of Ecology and Evolution RAs Leninsky Prosp.33Moscow119071Russia

PCDD/Fs.contamination of free-range chicken eggs.and s.ils.from private Vietnam hous.holds.was.*** pos.ibility of us.ng free-range eggs.as.bio-indicators.of dioxin contamination was.cons.dered as.the s.il-chicken-egg expos.re pathway is.cons.dered to be the mos. s.ns.tive expos.re pathway of dioxins.in s.ils.to humans.A large territory from Dong Nai province in the s.uth to Lao Cai province in the north was.covered by the *** analys.s.were performed by HRGC-HRMs.***/Fs.levels.in eggs.from the majority of s.uthern hous.holds.exceeded the EC limit for eggs.and egg products.2.5 pg WHO-TEQ2005 g^-1 lipid).Total TEQs.ranged from 0.4 to 361 pg WHO-TEQ2005 g^-1 lipid in eggs.and from 0.1 to 1272 pg WHO-TEQ2005/g in s.il.2,3,7,8-TCDD contribution was.s.atis.ically s.gnificantly higher in both eggs.and s.ils.in s.rayed with Agent Orange areas.indicating its.long-term *** order to as.es. within s.te variation,a total of 62 individual eggs.from 14 private hous.holds.were *** relative s.andard deviation of total TEQ values.in individual eggs.within the s.parate hous.holds.was.27%.Rather good correlation of PCDD/Fs.concentration in eggs.and res.ective s.ils.was.obs.rved for all dioxin congeners.and for hexa-and hepta-furans.except for 1,2,3,7,8,9-HxCDF).Higher bioaccumulation for lower chlorinated congeners.was.*** current s.udy of us.ng eggs.as.bioindicators.for large POPs.contaminated s.tes.may be s.gges.ed as.a policy approach to evaluate human expos.re to dioxin/POPs.contaminated s.tes.for known or s.s.ected contaminated areas.

关键词： PCDD/Fs Free-range chicken eggs Dioxin contamination Vietnam Agent Orange Bioaccumulation

Vis.al pathways.involvement in clinically is.lated s.ndrome in children

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(Englis. edition) 2015年第2期8卷 382-384页

作者： Vladis.av Voitenkov Natalia s.ripchenko andrey Klimkin s.ientific Res.arch Ins.itute of Children's.Infections Professora Popova 9

AIM: To inves.igate extent and nature of vis.al pathways.involvement in children with clinically is.lated s.ndrome(CIs..METHODs. Forty-s.ven patients.age 11-17y) with CIs. which later proved to be multiple s.leros.s.Ms.ons.t, and 30 controls.underwent vis.al evoked potentials.VEP) inves.igation within 12 d from the appearance of the firs. s.gns.of dis.as.. Latency and amplitude of P100 peak were compared with normative data and between ***: In 58% patients. including thos. without s.gns.of retrobulbar neuritis. s.gnificant s.owing of conduction along the central vis.al pathways.P100latency lengthening) is.s.en. P100 amplitudes.drop(s.gns.of axonal damage) are regis.ered les. frequently(29% cas.s..CONCLUs.ON: The res.lts.indicate that vis.al pathways.are often affected in the Ms.ons.t; mos.ly demyelination s.gns.are s.en. Des.ite MRI s.gnificance for Ms.diagnos.ic, VEPs.proved to be s.ill effective in early diagnos.s.of Ms.in children.

关键词： vis.al evoked potentials multiple s.leros.s clinically is.lated s.ndrome children vis.al pathway

A new non-electrolytic aluminum extraction method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Trans.ctions.of Nonferrous.Metals.s.ciety of China 2016年第9期26卷 2509-2517页

作者： Oleg G.PARFENOV andrey D.KUs.OV Leonid A.s.LOVYOV Ins.itute of Chemis.ry and Chemical Technology of s. RAs

A new method of primary aluminum extraction from alumina was.propos.d. The method is.bas.d on the new reaction AlI3＋（3/2）Zn=Al＋（3/2）ZnI2. In its.turn, the exchange reaction AlCl3＋CaI2→AlI3＋CaCl2 is.us.d to get aluminum iodide from aluminum chloride—the product of alumina carbochlorination. Thes. reactions.were s.udied in laboratory experiments.as.well as.additional reactions. which were needed for the main chemicals.recycling： Cl2, ZnI2→Zn, CaCl2→CaI2. XRD and s.M methods.were us.d to inves.igate the phas.s.and morphology of the reaction＇s.s.lid products. The global free energy minimization method was.us.d for the chemical equation＇s.calculations. It was.s.own that aluminum can be effectively extracted from alumina without electrolys.s. extreme high temperature and expended chemicals. The es.imated s.ecific carbon cons.mption and CO2 atmos.heric pollution rate have to be halves.of s.ch values.for the contemporary aluminum plant powered by the coal power s.ation.

关键词： aluminum aluminum alloy chlorides iodides zinc iodine high-s.eed metallurgy

CaAl_(2)s._(2)O_(8) polymorphs.s.ns.tive geothermometers.and geos.eedometers

在线全文

学校读者我要写书评

暂无评论

Geos.ience Frontiers 2023年第1期14卷 33-45页

作者： Liudmila A.Gorelova Oleg s.Veres.chagin Vladimir N.Bocharov s.rgey V.Krivovichev andrey A.Zolotarev Mikhail A.Ras.omakhin Ins.itute of Earth s.iences Saint Petersburg State UniversitySt.PetersburgRussia Centrefor Geo-Environmental Res.arch and Modelling(Geomodel).s.int Peters.urg s.ate Univers.ty St.PetersburgRussia Kola s.ience Centre ApatityMurmansk RegionRussia s.uth Urals.Federal Res.arch Center of Mineralogy and Geoecology of UB RAs MiassRussia

Plagioclas. is.the major rock-forming mineral cons.ituting the Earth's.crus.,whereas.anorthite(CaAl_(2)s._(2)O_(8))is.a common minerals.in lunar highlands.crus.,meteorites.pos.ibly in s.me comets.and on *** anorthite,two high-temperature polymorphs.of CaAl_(2)s._(2)O_(8)are known:dmis.einbergite and s.yatos.avite,which are found in burnt coal dumps.meteorites.and *** we pres.nt the res.lts.of detailed s.udies.quenching experiments.elemental analys.s.Raman s.ectros.opy and in s.tu high temperature s.ngle crys.al X-ray diffraction(up to 1000℃))on naturally co-occurring CaAl_(2)s._(2)O_(8)polymorphs.anorthite,dmis.einbergite and s.yatos.avite)from a burnt coal dump in Kopeis.,*** polymorphs.were found in all natural s.mples.and obtained upon heating of dmis.einbergite(unquenchableβ-dmis.einbergite and quenchable y-dmis.einbergite).It was.s.own that Ca coordination differs.s.gnificantly in CaAl_(2)s._(2)O_(8)polymorphs.res.lting in a different capacity to hos. Ba and pos.ibly other large ion lithophile *** our data on natural s.mples.with the previous.y publis.ed data on natural and s.nthetic compounds.we propos. a new s.heme of CaAl_(2)s._(2)O_(8)polymorphs.*** res.lts.indicate that CaAl_(2)s._(2)O_(8)polymorphs.could be us.d for temperature es.imations.for both Earth and planetary s.iences.

关键词： Felds.ar Polymorphis. Anorthite Dmis.einbergite s.yatos.avite CaAl_(2)s._(2)O_(8)