Materials Literature
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The heterolayered BT/BNT thick films were fabricated by screen printing techniques on alumina substrates electrodes with Pt. We report the improved ferroelectric and dielectric properties in the heterolayered tetragonal/rhombohedral structure composed of the BT and the BNT thick films. We investigated the effects of d…
The crystal structure, anisotropic electrical resistivity and magnetic susceptibility, as well as specific heat results of the pure single crystals of BaFe{sub 2}As{sub 2}, BaFeNiAs{sub 2}, and BaNi{sub 2}As{sub 2} are surveyed. BaFe{sub 2}As{sub 2} properties demonstrate the equivalence of C(T), Fisher's d({chi}T)/dT…
用水热方法合成了两个新的配位聚合物[Co（trza）]（1）和[Ni（trza）（H20）2]（2）（Htrza=4H-1，2，4-三氮唑-4-乙酸）。单晶X-射线衍射结构分析表明：化合物1和2具有二维（2D）层状结构。在1中，Co（Ⅱ）离子采用六配位方式，分别与来自两个不同配体（trza）上的两个氮原子和四个羧基氧原子配位，形成八面体配位聚合物，每个羧基以二齿桥联方式连接两个Co原子，形成1D链，这些一维链进一步与唑环上的N原子形成2D层状结构。在2中，中心Ni（Ⅱ）离子采用同样的配位模式形成八面体配位聚合物，与1不同的是：来自两个配体阴离子（trza）上的两个羧基氧原子分别被两个配位水分子所取代，且配体上的羧基氧原子采用的是单…
The CIELAB coordinate has demonstrated as useful for description of the colour characteristics of decolourised flint glass. The amounts of cobalt and erbium oxides necessary for sufficient decolourising of additions of coloured cullet can be calculated from the appearant linear dependence of CIE a* and b* coordinates…
Thermal decomposition of tetraisothiocyanatodiamminchromate(III) of the complex of manganese(II) with dimethylsulphoxide on air and in inert atmosphere was investigated
The effect of elevated NaCl concentration (from 0.5 to 4.0 M) to the pigment content, O 2 exchange and activities of some oxidative stress enzymes in the green alga Dunaliella salina was investigated. The optimum NaCl concentration (2.0 M) for the intensive biosynthesis of green pigments and function of the photosynth…
L'amplification dépendante d'hélicase (HDA) est une nouvelle technologie d'amplification d'acide nucléique basée sur la capacité des hélicases à dérouler les doubles brins d ADN et des polymérases à synthétiser l'ADN complémentaire à partir d'amorces, pour l'amplification d'une séquence spécifique à température consta…
Relatório de projecto no âmbito de Bolsa Universidade de Lisboa/Fundação Amadeu Dias (2008/2009)
以聚碳酸酯（PC）和硅橡胶（SIR）为基体浸泡于苯胺（An）的盐酸溶液中，然后经氧化剂（NH4）2S208（APS）或FeCl3在基体中原位氧化聚合，制备导电聚苯胺（PAn）复合材料PAn-PC和PAn-SIR。研究了聚合反应的工艺条件对复合材料导电性能的影响，确定了合适的制备条件。采用扫描电镜（SEM）及荧光光谱对复合膜进行表征。
综述了Mo—Si—B合金的研究现状，分别从制备工艺、抗氧化性、断裂韧性、微观结构等方面进行了综述。Mo—Si—B合金可以作为新一代的航空发动机用结构材料和高温抗氧化涂层材料。研究表明，Mo—Si—B合金具有更加优异的高温力学性能和高温抗氧化性能。最后讨论了Mo—Si—B合金未来的发展方向。
The analysis of the redox reactionsin the CdTe-H 2 O-Na 2 S systems by means of chemical thermodynamics has been carried out. The equations of E = f(pH) have been derived for the thermodynamically possible reactions and they were used in the computing and plotting of the Pourbaix-diagram. The behavior of the CdTe sing…
Author Institution: Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
Hemos realizado calculos de energia total para estudiar la adsorcion de un atomo de Boro o Nitrogeno sobre la superficie (0001) del w-BN en una geometria 2x2. En los calculos, se resuelven las ecuaciones de Konh-Sham con una base de ondas planas y pseudopotenciales atomicos, y usando la aproximacion de gradiente gener…
采用溶胶-凝胶法合成粒径为3nm的TiO2颗粒,通过尾静脉注射到小鼠体内,在不同时间点剖取重要脏器,并用电感耦合等离子体-质谱法(ICP-MS)测量各个器官内TiO2的含量。结果显示,尾静脉注射进入小鼠体内的TiO2,很快随血流分布到全身各脏器,滞留在体内的TiO2主要集中在肺、肝、脾三脏,每克组织的摄取量(%ID/g)分别在6h、1h、1h达到最大值141.73%、25.55%、18.07%。实验还发现,对照组小鼠脑中Ti的含量高于血液,静脉注射3nmTiO2后,小鼠脑中Ti的含量显著增加,在实验的各个时间点(除0.5h),实验组小鼠脑中Ti的含量都比血液高。结果表明纳米TiO2颗粒的脑毒性研究可能成为其生物效应研究的重点。
In order to demonstrate the potential of magnetic refrigeration which can provide cooling effects without affecting the environment, an experimental setup was built, in which a rotating regenerative gadolinium beds of 350 g were used. Water was used as a heat transfer fluid, and a magnetic field of 1.5 T was applied u…
乳液法制备OMMT（有机蒙脱土）／P（MMA—BA—AA）（甲基丙烯酸甲酯／丙烯酸丁酯／丙烯酸共聚物）复合材料，X射线衍射（XRD）研究表明形成插层型纳米复合材料。考察单体甲基丙烯酸酯（MMA）、丙烯酸丁酯（BA）、丙烯酸（AA）和OMMT用量对OMMT／P（MMA—BA-AA）乳液稳定性能与耐热性的影响。结果表明，当共聚单体MMA，BA，AA的质量比为20．0／4．0／2．0时，所得的P（MMA—BA-AA）耐热性最好；加入OMMT小于10％（质量分数）时，所得的乳液稳定性能与耐热性较好；OMMT／P（MMA-BA-AA）复合材料的起始热分解温度（Td）和玻璃化转变温度（L）比P（MMA-BA—AA）的分别提高了21．5℃和7．…
Improvements relative to the MC dose calculation speed have been made within the European project MAESTRO by the development of the fast MC code PENFAST and within the TELEDOS project by the parallelization of this code. This PhD work, based on these two projects, focuses on the evaluation of the technical and dosimet…
In the paper we generalize ideas about the sequence of changes in the position of a fatigue fracture site on and beneath the surface of titanium alloy VT3-1. The earlier plotted single fatigue curves should be separated into two different curves on grounds of fatigue crack generation on and beneath the surface. This c…
Two polyaromatic acid transition metal complexes: {[Cd(phen)(O 2 C )2 C 4 N 2 H 2 ]-H 2 O) n (1), and {[Mn(phen)(O 2 C) 2 C 4 N 2 H 2 ]'H 2 O) n (2) (phen = 1,10-phenanthroline) have been hydrothermally synthesized and characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. The stru…
Existe uma preocupacao grande para que sejam desenvolvidas formas de conciliar o aproveitamento racional dos recursos naturais e a utilizacao de novas tecnologias. O objetivo deste trabalho foi de tentar minimizar o impacto ambiental, mediante o aproveitamento e valorizacao do residuo de granito que e produzido pelo d…