Materials Literature
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采用单辊甩带法制备了Co43Fe20Ta5．5B31．5非晶合金薄带，利用差热分析、x-射线衍射以及振动样品磁强计研究了等温晶化和非等温晶化条件下晶化对显微组织和磁性能的影响。结果表明，等温晶化时，饱和磁感应强度聪和矫顽力风都随晶化体积分数a的增加而增加。经过928K保温55min的晶化处理以后，合金的聪值由制备态的37．2增加到58．4A·m^2／kg，与此同时矫顽力也由制备态的1．25×79．6A／m增加到634．45×79．6A／m。当只有（Co，Fe）21Ta2B6相析出时，风和版的增加幅度都比较小。随着晶化的进行，当晶体相（Co，Fe）3B2和（Co，Fe）B析出时风和聪都发生突然增高。在非等温晶化条件下，聪随终止温度的…
以便综合指向的药搬运人系统，磁性的 chitosan-5-fluorouracil nano 粒子被把 5 氟尿嘧啶(5-Fu ) 用作模型药准备，是的 Fe3O4 nano 粒子核，是的 chitosan 是的包围材料和 glutaraldehyde 通过超声的技术的生气连接代理人。磁性的 chitosan-5-Fu nano 粒子的形态学与一台传播电子显微镜(TEM ) 被观察。结果证明磁性的 chitosan-5-Fu nano 粒子与 5060 nm 的一个尺寸范围在球形的结构被准备。释放磁性的 chitosan-5-Fu nano 粒子的性质的交付的能力和药被紫外力的光谱分析调查。结果证明装载能力是 13.4% 并且在磷…
The lack of chemical uniformity in a powder mixture, such as clustering of a minor component, can lead to deterioration of materials properties. A method to determine powder mixture quality is to correlate the chemical homogeneity of a multi-component mixture with its particle size distribution and mixing method. This…
在不同热暴露条件下面的 7050 铝合金的微观结构借助于传播电子显微镜学(TEM ) 被调查，高分辨率电子显微镜学(HREM ) 和张力的测试。Guinier preston (GP ) 地区和阶段是主要在原版 7050 合金猛抛。在之间的取向关系和矩阵并且。当合金为 500 h 在不同温度被暴露时，与增加的热暴露温度， precipitates 变得更大，这能在 TEM 下面被看见并且宽度猛抛免费地区(PFZ ) 变得更大。合金在越多高温度被暴露，力量越被减少。两个 GP 地区并且猛抛变得更粗糙并且变得更宽的 PFZ 应该在热暴露期间为力量衰落和 7050 合金的延伸上升负责。
Fe40Al-xWC (x=0， 10， 12， 15 ) 有稠密的结构的涂层被 Fe，艾尔和 WC 粉末的混合物喷洒的高速度的氧燃料(HVOF ) 成功地扔。现在的工作的目的是在 650 点提供卓见进同样扔的涂层的氧化行为
Candida antarctica lipase B (CALB) (EC 3.1.1.3) is a serine hydrolase with an alpha/beta hydrolase fold. BASF have screened some well-known enzymes for transesterification of hydroxypropylcarbamate (hpc: 1hpc, 2hpc, 3hpc and 4hpc) with methyl acrylate. The results showed that the CALB had the highest activity among al…
Hybrid poplar has been planted widely in North America for its fast-growing, easy hybridization properties. However, due to its inherent characteristics of low density and high \nmoisture content, hybrid poplar is not well-suited for products requiring high strength, surface hardness, or for use in Joad bearing applic…
CuO/γ-Al2O3 sorbents were prepared by means of impregnation. Thermogravimetric technique was used to study the sulfation of CuO/γ-Al2O3 sorbents. The sulfation tests were performed using gas containing 0.1%-0.9% SO2, 5% O2, 3% H2O steam, and N2 as the balance. Experimental conditions including temperature, SO2 concent…
A standard sample of the natural waters composition, which is similar to the object of the analysis by its composition, is developed. The validated values of the component content in the sample's cathion-anion composition, as well as errors of the validated values and errors caused by inhomogeneity of the material of…
以Co(NO3) 2·6H2O和Co(NO2) 2·7C4H13OH为前驱体,采用热分解法制得Co/SiO2催化剂,通过BET、TEM、HRTEM、XPS和TPR等手段进行表征,并对F-T合成反应性能进行了评价.结果表明,浸渍法制备的Co3O4颗粒团聚严重,而热分解法制备的Co3O4颗粒呈球形,单分散状态.与浸渍法制备的催化剂相比,热分解法制备的催化剂孔容较小,表面钴硅原子比较高,钴硅相互作用较强.评价结果表明,热分解法制备的催化剂反应活性低于浸渍法制备的催化剂,但汽油(C5～C11)选择性高,且选择性在前驱体去结晶水后有所增大.
Transparent glass films with homogeneously doped light emissive molecules can be prepared by using the sol-gel process. As part of our work on improving the durability of water-soluble polysilanes against UV light irradiation, we fabricated Eu(TTA)3Phen-doped sol-gel glasses and studied their optical characteristics.…
The temperature dependence of yield stress or stress of martensite shear, compression curves σ(e) and mechanisms of plastic deformation in [001] oriented TiNi(Fe, Mo) single crystals was studied. It is shown that stress-induced В2 → В19′ martensite transformation and mechanical twinning in the В2 phase are the basic m…
Tb0.3Dy0.7HoxFe1.95 (x=0.00， 0.05， 0.10， 0.15， 0.20， 0.35， 0.50， 0.65 ) 第四级的合金被准备由由退火融化弧、跟随。在场的阶段和合金的结构用 D8 进展 X 光检查衍射计被决定。合金的磁伸缩被标准紧张计量器技术学习。依赖惊讶合金的结构，磁伸缩和密度上的内容详细被调查。研究结果证明惊讶做没在 Tb0.3Dy0.7Fe1.95 改变 MgCu2 类型立方的洗结构。什么时候惊讶内容 x0.2 ，在增加的合金介绍的富有的稀土元素阶段和合金的磁伸缩与增加 x 显然减少了，要不是有 x 的合金> 0.2 ，稀土元素阶段开始了到还原剂和磁伸缩的富人的内容快速增加了，特别在在有…
Nel lavoro di tesi che ha per titolo “Applicazione della Termografia IR a pelli per abbigliamento e calzature con microcapsule a cambiamento di fase per valutazione delle proprietà termoregolanti” si è studiata la possibilità di additivare microcapsule contenenti materiali a cambiamento di fase a pelli per l’abbigliam…
Samples from 12 East Antarctic firn and ice cores were analyzed using scanning electron micrcoscopy (SEM) in order to first develop a technique for the accurate characterization of physical properties and then to investigate the relationship between the physical microstructure and chemical properties. Both physical pr…
Die Xi-Phasen des Aluminium-Palladium-Mangan (AlPdMn) sind Approximanten für einen dekagonalen Quasikristall mit einer Gitterkonstanten von 1.6 nm in der periodischen Richtung. Diese Systeme können jedoch aufgrund ihrer Größe nicht mit ab-initio-Methoden berechnet werden, die Einheitszellen dieser Phasen umfassen jewe…
采用TiCl4和La（NO3）3·6H2O共沉淀法制备固体超强酸SO4^2-/TiO2-La2O3催化剂。制备条件为nTi/nLa比为8：1，-15℃陈化24h，120℃干燥12h，浸渍液硫酸浓度为0．5mol·L^-1，浸渍4h，120℃干燥1h，400℃焙烧4h的催化剂对乳酸与乙醇的酯化反应有较高的活性。将此催化剂用于乳酸和乙醇合成乳酸乙酯的酯化反应，考察了催化剂用量、乙醇和乳酸的物质的量的比、反应时间、带水剂环己烷的用量对酯化反应的影响。实验结果表明，醇酸物质的量的为2．0：1，催化剂用量为所用乳酸质量的1．4％，环己烷为乙醇体积的78％，反应时间4h条件下酯化产率达82％。催化剂易回收，使用寿命长的优点。
建立了高锰酸钾电位滴定测定锰的方法，研究了不同合金中测定锰的条件。结果表明：在焦磷酸钠介质中，采用Pt指示电极和Ag参比电极指示滴定终点，用KMnO4溶液滴定Mn（Ⅱ）为Mn（Ⅲ），测定6．00～30．00mgMn，相对误差≤±0．33％，加标准回收率在99．60％～100．40％。方法准确度高，重现性和选择性好，操作简便，终点敏锐，已应用于锰质量分数为7％～98％的银、铜、镍、锰等合金中锰的测定，结果满意。
An important share of international exchanges take place within multinational firms, according to internal transfer prices. These prices can be influenced by cross-country differences in corporate taxation. A multinational group can reduce its global fiscal burden through overpricing of goods moving from low-tax to hi…
This thesis aims at preparation of hollow polylactide (PLA) microcapsules for use as ultrasound contrast agents with controlled size, structure and mechanical and thermal properties. The microcapsules were prepared with multistage premix membrane emulsification. The mechanical and thermal properties of the microcapsul…