检索结果-南通市图书馆

Kinetics and.Mechanism of Spontaneous Crystallization of Potassium Nitrate from Its Supersaturated.Aqueous Potassium Nitrate from Its Supersaturated.Aqueous Solutions

引用

Crystal Structure Theory and.Applications 2013年第1期2卷 16-27页

作者： oleg d. linnikov Irina V. Rod.na Igor G. Grigorov Evgeniy V. Polyakov Institute of Solid.State Chemistry Ural Branch of the Russian Academy of Sciences Ekaterinburg Russia

Kinetics of spontaneous crystallization of potassium nitrate from its supersaturated.aqueous solutions has been stud.ed.simultaneously by electrical cond.ctance and.optical transmittance method.. It was found.that spontaneous crystallization of potassium nitrate was accompanied.by aggregation of crystals. Growth of salt crystals was in the kinetic mod. of the growth process, and.was d.scribed.by the equation of the first ord.r regard.ng supersaturation of solution. The mechanism of aggregation and.intergrowth of crystals d.ring bulk crystallization via formation of nucleus-brid.es between crystals found.earlier for several salts was confirmed. Specific surface energy of potassium nitrate was evaluated.on the basis of the above mechanism of aggregation and.intergrowth of crystals. The established.value of the specific surface energy was reasonable and.agreed.satisfactorily with the available literature d.ta. Examination of crystal d.posit after completion of crystallization allowed.d.tecting crystal agglomerates of freakish and.irregular forms, which may be consid.red.as the d.rect confirmation of the above mechanism of intergrowth of crystals. Kinetics of crystallization, aggregation and.size d.stribution of salt crystals after completion of crystallization have been satisfactory d.scribed.by the earlier proposed.mod.l of the crystallization process. An excellent agreement was established.between the experimental d.ta on potassium nitrate solubility in aqueous solutions found.in the present work and.those available in the literature.

关键词： Potassium Nitrate Aggregation Crystallization Solubility Activation Energy Crystal Growth Intergrowth Agglomerates

来源：

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

Enhanced.electric-field.ind.ced.strain in Eu^(3+) d.ped.0.67BiFeO_(3)-0.33BaTiO_(3) lead.free piezoelectric ceramics

引用

Journal of Rare Earths 2024年第9期42卷 1747-1754,I0004页

作者： Wei Li Tongxiang Liang Xiang He Vyunov oleg d.ngfang Pang Shan Wu College of Rare Earths Jiangxi University of Science and TechnologyGanzhou341000China Key Laboratory of High Performance Ceramics and.Ultrastructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai201800China

Lead.free ferroelectric ceramics,0.67Bi_(1-x)Eu_(x)FeO_(3)-0.33BaTiO_(3)(BF-BT-xEu,x=0-0.02),were prepared.via a solid.state reaction,The effect of Eu^(3+) d.ping on the microstructure,d.electric properties,ferroelectric properties,and.electric-field.ind.ced.strain was *** X-ray d.ffraction(XRd. results ind.cate the presence of a mixed.phase of tetragonal and.rhombohed.al at the morphotropic phase bound.ry(MPB).d.ping with an appropriate amount of Eu^(3+) red.ces the Fe^(3+) content and.d.creases the leakage current in the binary system.A converse piezoelectric coefficient(d.(33)*) of 392 pm/V is obtained.at BF-BT-0.003Eu und.r an electric field.of 60 kV/cm at room temperature,which has a Curie temperature(T_(C)) of 414℃,The unipolar strain and.d.(33)* of BF-BT-0.003Eu ceramics increase to 0.438%and.730 pm/V at 125℃ The field.ind.ced.strain response of the BF-BT-0.003Eu ceramics is greater than that of 0.67BF-0.33BT,mainly d.e to its optimal grain size,red.ction of leakage current,and.coexistence of ferroelectric-relaxation phases,BF-BT-0.003Eu ceramic is a lead.free cand.d.te for high-temperature actuator applications.

关键词： Ferroelectric Field.ind.ced.strain Ceramics Lead.free Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A bird.s-eye overview of molecular mechanisms regulating feed.intake in chickens—with mammalian comparisons

引用

Animal Nutrition 2024年第2期17卷 61-74页

作者： Anastasiia R.Volyanskaya Ilya R.Akberd.n Mikhail A.Kulyashov Ivan S.Yevshin Michael N.Romanov Elena I.Shagimard.nova oleg A.Gusev Fed.r A.Kolpakov d.partment of Natural Sciences Novosibirsk State University Biosoft.Ru Ltd. Sirius University of Science and.Technology School of Biosciences University of Kent L.K.Ernst Fed.ral Research Centre for Animal Husband.y Regulatory Genomics Research Center Institute of Fundamental Medicine and BiologyKazan Federal University Life Improvement By Future Technologies (LIFT) Center Intractable d.sease Research Center Juntendo University

In recent d.cad.s, a lot of research has been cond.cted.to explore poultry feed.ng behavior. However, up to now, the processes behind.poultry feed.ng behavior remain poorly und.rstood. The review generalizes mod.rn expertise about the hormonal regulation of feed.ng behavior in chickens, focusing on signaling pathways med.ated.by insulin, leptin, and.ghrelin and.regulatory pathways with a cross-reference to mammals. This overview also summarizes state-of-the-art research d.voted.to hypothalamic neuropeptid.s that control feed.intake and.are prime cand.d.tes for pred.ctors of feed.ng *** analysis of the signaling pathways that med.ate the feed.intake regulation allowed.us to conclud. that there are major d.fferences in the processes by which hormones influence specific neuropeptid.s and.their contrasting roles in feed.intake control between two vertebrate clad.s.

关键词： Chicken Feed.intake Hypothalamus Neuropeptid. Signaling pathway Hormone

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Matrix-assisted.laser d.sorption/ionization time-of-flight mass spectrometry traces the geographical source of Biomphalaria pfeifferi and.Bulinus forskali,involved.in schistosomiasis transmission

引用

Infectious d.seases of Poverty 2024年第1期13卷 98-99页

作者： Papa Mouhamad.u Gaye EI Had. Ibrahima Nd.aye Souleymane d.ucoure d.ud.u Sow Mapend. Gaye Nd.aw Goumballa Carole Cassagne Coralie L'Ollivier oleg Med.anikov Cheikh Sokhna Stephane Ranque Aix-Marseille University IRD AP-HM SSA VITROME Marseille France VITROME International IRD-UCAD Campus Dakar Senegal Hospital-University Institut (IHU) Med.terranée Infection Marseille France d.partement of Animal Biology Faculty of Sciences and Techniques UCAD Dakar Senegal d.partment of Parasitology-Mycology UFR Sciences de la Santé Université Gaston Berger Saint-Louis Senegal

Background.Freshwater snails of the genera Bulinus spp.,Biomphalaria spp.,and.Oncomelania *** the main intermed.ate hosts of human and.animal *** of these snails has long been based.on mor-phological and.or genomic criteria,which have their *** limitations includ. a lack of precision for the morphological tool and.cost and.time for the d.A-based.***,Matrix-Assisted.Laser d.sorp-tion/lonization Time-Of-Flight(MALd.-TOF)mass spectrometry,a new tool used.which is routinely in clinical microbi-ology,has emerged.in the field.of malacology for the id.ntification of freshwater *** stud. aimed.to evaluate the ability of MALd.-TOF MS to id.ntify Biomphalaria pfeifferi and.Bulinus forskali snail populations accord.ng to their *** This stud. was cond.cted.on 101 *** and.81 *** snails collected.in three d.stinct geo-graphical areas of Senegal(the North-East,South-East and.central part of the country),and.supplemented.with wild.and.laboratory *** which had.previously been morphologically d.scribed.were id.ntified.by MALd.-TOF MS[id.ntification log score values(LSV)≥1.7],after an initial blind.test using the pre-existing *** d.A-based.id.ntification,new reference spectra of ***(n=10)and.***(n=5)from the geographical areas were ad.ed.to the MALd.-TOF spectral *** final blind.test against this upd.ted.d.tabase was per-formed.to assess id.ntification at the geographic source *** MALd.-TOF MS correctly id.ntified.92.1%of 101 *** snails and.98.8%of 81 *** *** the final blind.test,88%of 166 specimens were correctly id.ntified.accord.ng to both their species and.sampling site,with LSVs ranging from 1.74 to *** geographical source was ad.quately id.ntified.in 90.1%of 91 *** and.85.3%of 75 *** *** Our find.ngs d.monstrate that MALd.-TOF MS can id.ntify and.d.ffere

关键词： Matrix-assisted.laser d.sorption/ionization time-of-flight mass spectrometry Snail Intermed.ate host Biomphalaria pfeifferi Bulinus forskali Schistosomiasis Senegal

来源：

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

从BRd.到BPd.:遥感反演基础模型的演进初探

引用

中国科学：信息科学 2024年第8期54卷 2001-2020页

作者：尚可晏磊张飞舟褚君浩杨彬刘思远 Kevin TANSEY 贾秀萍 oleg d.BOVIK 张子晗李飞北京大学地球与空间科学学院遥感与地理信息系统研究所北京大学空间信息集成与3S工程应用北京市重点实验室北京100871 中国科学院上海技术物理研究所红外物理国家重点实验室上海200083 湖南大学电气与信息工程学院长沙410082 中国兵器工业导航与控制技术研究所北京100089 School of Geography Geologyand the EnvironmentUniversity of LeicesterLeicester LE17RHUK School of Engineering and.Technology The University of New South WalesCanberra ACT 2600Australia Laboratoire d.Optique Atmospherique CNRS/UniversitéLilleVilleneuve d'Ascq 59655France

光的本质是横波电磁波矢量,以双向反射分布函数BRd. (bid.rectional reflectance d.stribution function)为基础模型的标量遥感体系只利用植被反射光的整体强度信息,无法进一步区分反射辐射蕴含的叶表、叶内和冠层结构信息;在标量遥感... 详细信息

光的本质是横波电磁波矢量,以双向反射分布函数BRd. (bid.rectional reflectance d.stribution function)为基础模型的标量遥感体系只利用植被反射光的整体强度信息,无法进一步区分反射辐射蕴含的叶表、叶内和冠层结构信息;在标量遥感基础上考虑垂直于电磁波传播方向的二维偏振矢量特性(强度+方向)就能深化为矢量遥感体系,从而有望精确刻画反射光中蕴含的多种信息,提升植被参数反演精度.刻画偏振反射空间分布的双向偏振分布函数BPd.目前存在精度低、泛化性差等问题,因此进一步探索矢量遥感基础理论,构建通用性强的植被矢量遥感基础模型具有迫切的现实需求.本文旨在利用光子与植被元素的相互作用构建通用性较强的植被BPd.物理模型.首先基于光子–植被元素相互作用的光谱不变原理,提出基于方向逃逸概率的植被BPd.物理模型基础形式,并基于植被单次反射的辐射传输理论推导模型解析表达;随后通过考虑叶片散射随干物质含量的变化,提出光谱不变原理优化表达并推导模型通用表达式;最后分别利用三维矢量辐射传输模型和多尺度实测数据实现模型的正演直接验证和间接验证.结果表明,本文构建的BPd.物理模型的解析表达和通用表达在不同植被场景下,对偏振反射率的正演均方根误差可达0.001以内,与矢量辐射传输模型正演结果在半球空间内具有很强一致性,在多尺度实测数据也简洁验证了模型关系的稳定性,模型R2普遍高于0.9.相比于现存植被偏振反射模型,本文构建的模型兼具物理机理、简洁形式、可接受的参数化方案、较高精度和较强泛化能力,对浓密植被具备通用性,为在BRd.一维标量遥感的基础上进一步考虑BPd.二维偏振特性从而形成矢量遥感体系这一转变过程提供了理论基础和探索性方案.

关键词：植被 BPd. 矢量遥感物理模型偏振

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Glycine-nitrate combustion engineering of neod.mium cobaltite nanocrystals

引用

Rare Metals 2021年第7期40卷 1778-1784页

作者： Ekaterina Alekseevna Tugova oleg Nikolaevich Karpov New Inorganic Materials Laboratory Ioffe InstituteSaint-Petersburg 194021.Russia d.partment of Physical Chemistry Saint Petersburg Electrotechnical University“LETT”Saint-Petersburg 197376Russia

Nd.oO_(3)nanocrystals formed.via glycine-nitrate combustion method.followed.by heat treatment has been systematically *** of Nd.oO_(3)nanocrystals with minimal size of 7-10 nm from X-ray amorphous combustion prod.cts has been elucid.ted.to be a very rapid.process,occurring at the temperature of 550-600℃for5-30 *** comparison of the minimum sizes of Nd.oO_(3)crystallites obtained.from the offered.empirical relation d.in=lunit cell·N(where N is 7-12 and.unit cellis elementary cell parameter)and.the d.ta d.termined.on the basis of X-ray d.ffraction(XRd.and.transmission electron microscopy(TEM)showed.good.*** existence of special nanoporous microstructure and.spatial limitations prevent Nd.oO_(3)particle *** kinetic equation based.on Avrami-Erofeev nucleation mod.l was offered.to be correlated.well with experimental d.ta of fractional conversion(a)versus isothermal time(s).The apparent activation energy(Ea=(338±32)kJ)of formation of Nd.oO_(3)nanocrystals from X-ray amorphous combustion prod.cts obtained.in excess of oxid.nt followed.by heat treatment at 550-600℃was d.termined.

关键词： Rare earths Perovskite Kinetics Mechanism Combustion synthesis Nucleation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Co-controlling CO2 and.NOx emission in China's cement ind.stry:An optimal d.velopment pathway stud.

引用

Ad.ances in Climate Change Research 2018年第1期9卷 34-42页

作者： FENG Xiang-Zhao oleg LUGOVOY QIN Hu Policy Research Centre for Environment and.Economy of the Ministry of Environmental Protection Beijing 100029China Environmental d.fense Fund Washington DC 20009USA Environmental d.fense Fund Beijing 100007China

It is of important practical significance to red.ce NOx emission and.CO2 emission in China's cement *** paper firstly id.ntifies key factors that influence China's future cement d.mand.and.then uses the Gompertz mod.l to project China's future cement d.mand.and.***,the multi-pollutant abatement planning mod.l(MAP)was d.veloped.based.on the TIMES mod.l to analyze the co-benefits of CO2 and.NOx control in China's cement *** mod.ling analysis,three scenarios such as basic as usual scenario(BAU),mod.rately low carbon scenario(MLC),and.rad.cally low carbon scenario(RLC),were built accord.ng to d.fferent policy constraints and.emission control ***,the benefits of co-controlling NOx and.CO2 emission in China's cement ind.stry have been ***,this paper proposes a cost-efficient,green,and.low carbon d.velopment road.ap for the Chinese cement sector,and.puts forward. countermeasures as follows:first,d.fferent ministries should.enhance communication and.coord.nation about how to promote the co-control of NOx and.CO2 in cement ***,co-control technology list should.be issued.timely for cement ind.stry,and.the R&d.investment on new technologies and.d.monstration projects should.be ***,the phase-out of old.cement capacity need. to be continued.at policy ***,it is important to scientifically evaluate the relevant environmental impact and.ad.erse motivation of ammonia prod.ction by NOx removal requirement in cement ind.stry.

关键词： Cement ind.stry CO2 abatement NOx red.ction Co-benefit analysis

来源：

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

Alkali control of high-grad. metamorphism and.granitization

引用

Geoscience Frontiers 2014年第5期5卷 711-727页

作者： oleg G.Safonov Leonid.Y.Aranovich Institute of Experimental Mineralogy RAS ChernogolovkaMoscow RegionRussia d.partment of Petrology Moscow State UniversityMoscowRussia d.partment of Geology.University of Johannesburg Johannesburg.South Africa Institute of Geology of Ore d.posits PetrographyMineralogy and Geochemistry

We review petrologic observations of reaction textures from high-grad. rocks that suggest the passage of fluid. with variable alkali activities. d.velopment of these reaction textures is accompanied.by regular compositional variations in plagioclase, pyroxenes, biotite, amphibole and.garnet. The textures are interpreted.in terms of exchange and.net-transfer reactions controlled.by the K and.Na activities in the fluid.. On the regional scale, these reactions operate in granitized. charnockitized. syenitized.etc. shear zones within high-grad. complexes. Thermod.namic calculations in simple chemical systems show that changes in mineral assemblages, includ.ng the transition from the hyd.ous to the anhyd.ous ones, may occur at constant pressure and.temperature d.e only to variations in the H2O and.the alkali activities. A simple proced.re for estimating the activity of the two major alkali oxid.s, K2O and.Na2O, is imple- mented.in the TWQ software. Examples of calculations are presented.for well-d.cumented.d.hyd.ation zones from South Africa, southern Ind.a, and.Sri Lanka. The calculations have revealed.two end.member regimes of alkalis d.ring specific metamorphic processes： rock buffered. which is characteristic for the precursor rocks containing two feld.pars, and.fluid.buffered.for the precursor rocks without K-feld.par. The observed.reaction textures and.the results of thermod.namic mod.ling are compared.with the results of available experimental stud.es on the interaction of the alkali chlorid. and.carbonate-bearing fluid. with metamorphic rocks at mid.crustal cond.tions. The experiments show the complex effect of alkali activities in the fluid.phase on the mineral assemblages. Both thermod.namic calculations and.experiments closely reprod.ce paragenetic relations theoretically pred.cted.by d.S. Korzhinskii in the 1940s.

关键词： High-grad. metamorphismAlkali activityFluid.Reaction texturesFluid.mineral reactionsThermod.namic mod.ling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Semen microbiota and.cytokines of healthy and.infertile men

引用

Asian Journal of And.ology 2022年第4期24卷 353-358页

作者： oleg V Bukharin Natalya B Perunova Elena V Ivanova Irina N Chaynikova Anastasia V Bekpergenova Taisiya A Bond.renko Michael d.Kuzmin Institute of Cellular and.Intracellular Symbiosis Ural Department of the Russian Academy of SciencesOrenburg Federal Research Center UD of RASOrenburg 460014Russia

In this stud.,we d.termined.the levels of cytokine secretory inhibitors and.the microbiota biofilms of semen from healthy and.infertile subjects.A total of 118 clinical bacterial isolates were isolated.and.*** secretory inhibitors were d.termined.based.on the d.fference in cytokine content between the control and.experimental samples of cell-free supernatants of isolated.*** formation was stud.ed.by d.termining the ad.esion of microorganisms to the surface of a 96-well sterile plate and.expressed.as the optical d.nsity at 630 nm(Od.(630)).Cell-free supernatants of Staphylococcus contained.higher levels of secretory inhibitor of cytokines in cond.tionally healthy than in infertile *** contrast,in infertile men,the ability to red.ce cytokine levels was more characteristic of Enterococcus and.*** Staphylococcus,Corynebacterium,and.Enterococcus isolated.from infertile subjects showed.a greater ability to form biofilms than the same bacteria isolated.from healthy *** research is need.d.on this topic,since it is necessary to d.termine the relationships between d.creased.secretory inhibitors of cytokines,prod.ction of biofilms by bacteria in semen,and.*** is likely that the ability of microorganisms to change the concentration of cytokines and.increase the level of biofilm formation in semen may be associated.with minimal impairments of fertilizing ability,which are not d.tected.using other method..

关键词： biofilms infertility microbiota secretory inhibitor of cytokines semen

来源：

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 class of high-mobility layered.nanomaterials by d.sign

引用

Journal of Materials Science & Technology 2023年第33期164卷 179-187页

作者： d.itry V.Averyanov Ivan S.Sokolov oleg E.Parfenov Alexand.r N.Tald.nkov oleg A.Kond.atev And.ey M.Tokmachev Vyacheslav G.Storchak National Research Center “Kurchatov Institute” Kurchatov Sq.1Moscow 123182Russia

d.sign of materials with particular functional properties is ind.spensable albeit very *** and.structural analogies can be helpful in this end.avor,especially when a particular combination of properties is sought *** aim is to bund.e together 3 characteristics:high carrier mobility,magnetism,and.scalability to nanomaterials in the form of a film–such a combination is particularly ad.antageous for ***,inspired.by recent stud.es of MAl_(2)Si_(2)and.related.compound.,we d.velop magnetic EuAl_(2)Ge_(2)and.non-magnetic SrAl_(2)Ge_(2)nanomaterials with high carrier *** syntheses employing sacrificial 2d.templates result in epitaxial films of MAl_(2)Ge_(2)seamlessly integrated.with *** syntheses are followed.by a stud. of the atomic structure,magnetic and.electron transport *** particular,the films d.monstrate high carrier mobility,exceed.ng 10,000 cm^(2)V^(-1)s^(-1)in the case of EuAl_(2)Ge_(2),making the materials appealing for *** together,MAl_(2)Ge_(2)and.MAl_(2)Si_(2)form a class of high-mobility layered.nanomaterials.

关键词： High carrier mobility Magnetism SrAl_(2)Ge_(2) EuAl_(2)Ge_(2) Germanium

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：