Materials Literature
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The present work has been devoted to the catalytic reduction of N_2O by H with Pt/SiO_2 catalysts at very low temperatures, such as 110℃, and their nanoparticle sizes have been determined by using H_2-N_2O titration, X-ray diffraction(XRD) and high-resolution transmission electron microscopy(HRTEM) measurements. A sa…
为提高TiO2晶体的光催化性能,采用基于密度泛函理论的平面波超软赝势方法,研究了S和Co分别单掺杂和双掺杂锐钛矿TiO2的晶体结构、电子结构和光学性质.研究结果表明：原子替位掺杂后体系晶格畸变较小;禁带中杂质能级的出现使TiO2光吸收带边发生了明显红移,且在可见光区的吸收效率显著增加,大大提高了光催化效率.与单掺杂比较发现,（S,Co）双掺杂红移现象更加明显且在可见光区均有吸收,为较好的掺杂改性方式.该成果对实验合成性能较佳的TiO2具有较好的指导意义.
This PhD thesis deals with the notion of dynamic electron density and describes the effect of temperature on the electron density distribution by analyzing both static and dynamic densities of crystals. The dynamic electron densities have been successfully computed by inverse Fourier transform of accurately computed s…
利用DIONEX ASE350快速溶剂萃取设备提取了化妆品包装材料中可能使用的邻苯二甲酸二丁酯（DBP）、邻苯二甲酸丁基苄基酯（BBP）、邻苯二甲酸二（2-甲氧基）乙酯（DMEP）、邻苯二甲酸二（2-乙基己基）酯（DEHP）、邻苯二甲酸二异辛酯（DI-OP）和邻苯二甲酸二异壬酯（DINP）等六种邻苯二甲酸酯类增塑剂。萃取溶剂为正己烷,萃取温度150℃,压力8 963kPa,驻留时间8min,循环3次,冲洗体积50%,吹扫时间20s。样液经浓缩后采用气相色谱/质谱联用方法测定。试验分析了10个化妆品包装垫片材料样品,发现增塑剂含量范围在0.0024%～1.57%。此方法检测效果良好。
得克萨斯州圣安东尼奥的西南研究院获得了R＆D杂志颁发的R＆D100奖，因为他们采用新型铸造技术将航空陶瓷和汽车砂芯加工结合，能够在汽车铸铁／钢零件中精密铸造出非常小的通道。这项技术是与英国什罗浦郡的Grainger and worrall公司共同开发，
The pressure-induced phase transitions of PbCO3 are studied using synchrotron radiation in a diamond anvil cell at room temperature. The XRD measurement indicates that PbCO3 with an initial phase of aragonite-type structure undergoes two phase transitions at ～7.8GPa and ～15.7GPa respectively. The higher-pressure phase…
Mathematical model of heat conduction problem for plates and shells with multilayer coating is built.
The aim of the paper is the morphological investigations of the tissue reactions on the polymers of natural origin, subcutaneously and intraperitoneally implanted in rats. These polymers can be potentially useful to create the anti-adhesive membranes. Subcutaneous implantation model showed that the polyhydroxybutyrate…
This study investigated one-step (317~648℃/8 h) and two-step (317~648℃/8 h + 426℃/24 h) aging treatments to the Ti-15V-3Cr-3Al-3Sn alloy (Ti-15-3 alloy). The effects of aging treatment on the microstructure and mechanical properties were also evaluated. The mechanical tests involved the tensile, notch tensile, J-integ…
{100}织构因具有两个易磁化方向能够明显的提高磁性能，因此如何在表面获得具有{100}织构一直是无取向电工钢研究焦点。本文主要介绍了获得{100}织构的主要工艺方法及其基本原理，并结合实际生产过程对各工艺方法的优缺点进行了分析；一方面，优化无取向电工钢的成分，降低碳、锰元素含量以避免脱碳退火和真空退火，简化生产工艺；另一方面，调节升温速度、降温速度和退火气氛，使{100}晶面的表面能或弹性应变能最低，制备具有{100}织构柱状晶组织的无取向电工钢是今后的发展方向。
Melilite-type gallate, La1.5Sr0.5Ga3O7.25 (LSG), appears to be promising as electrolyte material for intermediate temperature solid oxide fuel cells (IT-SOFCs). To achieve good cell performances, the cathode material must be chemically stable at high temperature, the reactivity among adjacent components must be at min…
Many chemically reasonable inorganic materials are missing from databases or literature. Two possible reasons are: (1) these materials are unstable; (2) they have been simply overlooked. Here we applied Inverse Design approach to systematically screen V-IX-IV group of 45 ternary ABX materials. High-throughput theory r…
Nanocrystalline Cu with average grain sizes ranging from ～ 24.4 to 131.3 nm were prepared by the electric brushplating technique.Nanoindentation tests were performed within a wide strain rate range,and the creep process of nanocrystalline Cu during the holding period and its relationship to dislocation and twin struct…
目的：比较L929细胞在聚乳酸-壳聚糖-明胶（PLA—Chitosan—Gelatin）梯度孔径、均匀孔径两种支架材料上的细胞接种率，选择细胞接种率较高的支架材料；通过比较不同细胞密度在聚乳酸-壳聚糖-明胶梯度孔径支架上的细胞粘附量，探究细胞接种的适宜密度。方法：在两种孔径支架材料上分别接种不同密度的细胞悬浮液，MTT法检测其粘附情况；调整细胞接种密度到同一梯度孔径支架材料上，MTT法比较不同密度细胞在同一梯度孔径支架上的粘附情况。结果：L929细胞在两种支架上均能粘附，在聚乳酸-壳聚糖-明胶梯度孔径支架上的接种率明显高于均匀孔径支架（P〈0．01），且随接种密度的增高，粘附到梯度孔径支架上的细胞数量增加，当细胞接种密度达1．0×…
이산화탄소의 증가에 따른 온실가스 저감방법에 대한 연구들이 활발히 진행이 되고 있다. 이산화탄소는 지구 온난화를 야기하는 대표적인 온실가스이다. 이를 저감하기 위한 방안으로는 CCS(Carbon Capture and Storage)를 예로 들 수 있다. 하지만 CCS기술은 에너지의 소비가 비교적 높은 기술이며, 분리된 이산화탄소를 안정적으로 저장하기 위한 방법과 공간의 부재가 문제가 되고 있다. 이를 보완하기 위한 방안으로 CCU (Carbon Capture and Utilization)을 예로 들수 있다. CCU기술은 금속이온이나 생물학적인 방법으로 이산화탄소를…
利用热拉伸获得不同性能与结构形态的PGLA（GA/LA摩尔比=90/10）纤维,并进行体外降解实验。在降解过程中,采用DSC、傅里叶红外光谱、扫描电镜等测试手段对PGLA（90/10）纤维的性能与形态变化进行研究。结果表明,热拉伸显著改变PGLA（90/10）纤维的降解特征。
The article describes the rise in strength of cement-fiber composite, depending on the amount of additives and water-cement ratio.
Some protein sequences have distinct amino acid motifs that always form a characteristic structure. Prediction of these structures from sequence is quite achievable using presently available methods and information. For most proteins, the accuracy of secondary structure prediction is approximately 70–75%. The need for…
针对日益严重的水体重金属污染及工业废水处理问题,利用一种由1,12-十二烷-O,O＇-二苯基磷酸（DDDPA）和4-乙烯基吡啶作为双功能单体得到新型铅离子印迹聚合物微球,对其吸附及识别性能展开研究,结果表明,铅离子印迹聚合物微球对水中Pb2＋有着良好的吸附性能,当溶液pH＞5时,就能保持很高的吸附效率.选择性吸附试验研究发现,当共存金属阳离子为Zn^2＋,Co^2＋,Ni^2＋时,铅离子印迹聚合物微球对目标Pb^2＋的选择性较好,试验条件下的选择吸附系数分别为86.6,53.0和46.5;铅离子印迹聚合物对Cr^3＋和Cu^2＋具有一定的吸附能力,试验条件下的选择吸附系数分别为20.8和9.5.对铅离子印迹聚合物微球的洗脱试验结果…
A series of ZnO-Bi2O3-based varistor ceramics doped with 0-0.4 mol.% Sc2O3 were prepared by high-energy ball milling and sintered at temperatures between 1000 and 1150oC. X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were applied to characterize the phases and microstructure of the varistor ceramic…