Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
掺杂Eu和Tb离子的一维稀土氧化物发光材料因具有与其体相材料不同的光谱特性在近年来引起了人们的极大研究兴趣。(Gd0.9Eu0.1)(OH)3和(Gd0.9Tb0.1)(OH)3纳米棒前驱物通过水热法首先被合成,然后经退火处理得到Gd2O3∶RE3+(RE:Eu,Tb)纳米棒。FE-SEM的形貌测试结果表明,Gd2O3∶RE3+(RE:Eu,Tb)纳米棒有约为20～60nm直径和200～500nm长度。XRD的结构测试证实,所得到的Gd2O3∶RE3+(RE:Eu,Tb)纳米棒样品均属于立方晶系。光谱测试结果表明,同体相材料相比,Gd2O3∶RE3+(RE:Eu,Tb)纳米棒的Eu3+和Tb3+的特征发光峰出现了宽化现象,样品的纳…
Дисертація на здобуття наукового ступеня кандидата фізико-математичних наук за спеціальністю 01.04.01 – фізика приладів, елементів і систем. – Сумський державний університет, Суми, 2010. Дисертаційна робота присвячена теоретичному дослідженню нового джерела потужного електромагнітного випромінювання в міліметровому-су…
利用共沉淀方法制备了Eu3＋/Yb3＋单掺和共掺的ZrO2粉体材料,研究了煅烧温度和掺杂浓度对结构和发光性质的影响。XRD结果表明：所制备单掺样品含有单斜相和四方相2种不同结构,随着热处理温度的升高,四方相向单斜相转变,经1 150℃处理后,四方相消失,呈现单一的单斜相;Yb3＋离子的掺入有稳定ZrO2四方相的作用,随着掺杂浓度的增加,单斜相转变为四方相。由于晶相的不同,Eu3＋处在四方相和单斜相2种发光中心,二者发光性质不同。Eu3＋/Yb3＋共掺后,在270 nm激发Eu3＋时,观测到了Yb3＋在近红外波段（980 nm）的发光,同时证实Eu3＋的激发光谱和Yb3＋的激发光谱相一致,表明存在Eu3＋到Yb3＋的能量传递,交叉弛…
Modeling corrugated sheet with orthotropic properties and the effect of stiffened panels on a rail vehicle’s natural frequencies and modes
为了研究非平衡凝固条件下（Fe83Ga17）100-xMx（x=0、0．5、1、1．5；M—C、B）合金的相组成及其磁致伸缩性能，采用吹铸的方式制备了（Fe83Ga17）100-xMx（x=0、0．5、1、1．5；M—C、B）合金，结果表明，合金保持了A2（bcc-Fe（Ga））相结构。C、B元素对合金微观组织产生了很大影响，C完全固溶于bcc-Fe中，B于晶界处大量富集，晶粒形状呈区域定向排列。添加C、B均对Fe83Ga17合金的磁致伸缩性能产生了抑制作用。添加C增大了弹性模量，当x=1时磁致伸缩值最大；添加B对合金组织产生了巨大影响，随着B含量的增加形成了明显的铸造织构，并且生成了富含Fe2B的相，x=1．5时磁致伸缩值最大。
The phase evolution,microstructure and magnetic properties of Nd9-xYxFe72Ti2Zr2B15(x=0,0.5,1,2) nanocomposite ribbons were investigated.It was found that substitution of Y enhanced glass forming ability of the over-quenched ribbons and stabilized the amorphous phase during post annealing treatment.Appropriate content…
A aluminum matrix-W rod/wire structural material in support of DARPA initiative BAA 08-23 was developed and its density and mechanical strength ascertained, both being part of the DARPA matrices. Aluminum tubes and four 90 degree cross-ply tungsten fiber layers were arranged such that under extreme static pressure con…
Interpretation of Patterson maps lies at the foundation of most macromolecular structure elucidation processes, both in determining the position of heavy atoms and/or anomalous scatterers for the isomorphous replacement and anomalous-scattering methods, and in determining the orientation and position of a homologous p…
This thesis highlights two important areas of research towards the improvement of cathode performance in a SOFC. 1) Mesostructured thin films of CGO were synthesized with the sol-gel process - utilizing block copolymers combined with the process of dip-coating. This type of film, with controlled porosity, was then inc…
等轴的热能力 cv 和在 HCP， FCC，电子消息传输方式和液体状态的 Ru 金属的等压线热能力 cp 被使用纯元素计算系统的理论。结果在对联合 army-navy-air 力量(JANAF ) 的好同意试验性的价值和计算结果由第一原则(FP ) 方法。但是结果与科学的组 Thermodata 欧洲(SGTE ) 数据库相对照有大差别。原因被发现那加热能力在一个原子(OA ) 调整 cp 不能忽视电子贡献方法。在 OA 方法和 SGTE 数据库之间的不同被讨论。主要原因是 OA 方法在 hybritriangle 与 iso-Ec-line 和 iso-a-line 采用 crosspoint 决定性质，而是 SGTE 数据库被…
Zitzenreinigung vor dem Melken ist notwendig, um die Milch vor einer mikrobiellen Kontamination durch Verschmutzung zu schützen. Die Sauberkeit von Euter und Zitzen vor dem Melken wird deshalb auch rechtlich durch die Richtlinie 89/362/EWG gefordert. Der Effekt unterschiedlicher Zitzenreinigungsverfahren auf die Milch…
Históricamente la clasificación bacteriana ha constituido un problema. Los pocos caracteres morfológicos visibles requieren de un alto número de pruebas adicionales para poder definir una especie y darle al microorganismo un nombre que lo sitúe como entidad reconocida por aquéllos que lo estudian. A partir de este enf…
Porphyrins and their analogs are a class of chemically and biologically important compounds that have found a variety of applications in different fields such as catalysis, medicine, and materials. The physical, chemical, and biological dependence of the peripheral substituents of porphyrins on their properties has pr…
The topological control of metal-organic frameworks (MOFs) has been of particular interest in materials research due to the exciting applications in hydrogen storage and catalysis. MOFs consist of organic linkers and metal nodes. The metal nodes are connected via coordinating bonding to organic linkers, resulting in a…
Nanoporous high surface area silicas are an ideal substrate for the design of materials with useful properties via chemical surface modification. The adsorption of heavy metals for contaminated water detoxification is one potential application. In this work we have used three different kinds of silica substrates with…
The work presented in this thesis mainly focuses on the nucleation and growth of metal thin films on multimetallic surfaces. First, we have investigated the Ag film growth on a bulk metallic glass surface. Next, we have examined the coarsening and decay of bilayer Ag islands on NiAl(110) surface. Third, we have invest…
In order to improve the corrosion resistance and increase the service lifetime of P110 steel during operation,four chromizing coatings were formed onto its surface with/without addition of rare earths via pack cementation process.The surface morphologies and microstructures of the chromizing coatings were observed usi…
Ce-Cu-O monolithic catalysts were prepared by using Ce0.9Cu0.1O1.9 solid solution or nitrate as precursors,and their catalytic performance for the combustion of ethyl acetate were studied.The catalysts calcined at a low temperature showed high catalytic activities.When calcined at high temperatures,the catalyst with C…
Les stents coronariens sont des dispositifs médicaux, généralement fabriqués en acier inoxydable 316L, utilisés pour traiter des maladies cardiovasculaires comme l’athérosclérose. Les stents recouverts ou à relargage contrôlé de médicaments sont des solutions prometteuses pour réduire les phénomènes de resténose. Ce t…
Recently, the eddy current testing(ECT), alternating current field testing, magnetic flux leakage testing and remote field testing have been used as a nondestructive evaluation method based on the electromagnetic induction phenomenon. The eddy current testing is now widely accepted as a NDE method for the heat exchang…