Materials Literature
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Zinc oxide (ZnO) is a promising material for ultra-violet optoelectronics applications due to its direct band gap and large exciton binding energy. Defect in semiconductor plays an important role in determining the optical and electrical properties. It is thus crucial to understand the defects‟ performance for realizi…
The surface corrosion of anode carbon blocks in rare earth electrolytic cell caused by anode reaction was investigated.The results show that after a production cycle(1h),the porosity of different anode carbon block sample ranges between 0.006 9±0.001 4,but with a big difference of specific surface area of sample.This…
Based on the mechanism that the oxidation rate of carbon is primarily related to oxygen supply in the earlier stage and mass transfer of carbon in molten steel in the later stage,a mathematical model was proposed to describe the argon oxygen decarburization( AOD) oxidation refining process of low carbon twinning induc…
Magnesium is the lightest of all structural engineering metals used today, 33% lighter than aluminium and 75% lighter than steel. It has good ductility, electromagnetic interference reduction, excellent castability and, through proper alloying, also high strength. Although it is often used in lightweight construction,…
The strongly nonlinear dynamics of a noncontact AFM model with external feedback control is analyzed with the aim to achieve a description of its local and global dynamical behavior, and to realize a comparison with the results of the underlying uncontrolled system. As a result, the critical evaluation of the effectiv…
采用电化学方法研究N,N′-双(2-亚甲基吡啶)-1,2-亚氨基乙烷(BPIE)Schiff碱在0.010 mol/L HCl溶液中对AZ91D镁合金的腐蚀抑制作用。动电位极化曲线表明,BPIE Schiff碱是一种混合型缓蚀剂。电化学阻抗谱(EIS)测量证实了BPIE的腐蚀抑制作用。随着缓蚀剂浓度的增加,由于有更多的缓蚀剂吸附在AZ91D镁合金表面,电荷转移阻力减小,双电层电容减小。电化学噪声(EN)分析获得的数据在时间和频率域与EIS和极化曲线所得结果表现出良好的一致性。采用扫描电子显微镜(SEM)、X射线衍射(XRD)和能量色散X射线(EDX),研究BPIE的缓蚀作用。SEM照片显示,在存在BPIE的情况下,AZ91D合金表…
The effects of pretreatment methods,dissolving temperature,dissolving time,and liquid-solid ratio on the dissolution rate and the precipitation rate of mulberry powder in [AMIM][Cl]were studied. The key factors and the mechanism of impedinge wood completely dissolution were discussed. The test showed that pretreatment…
Solid oxide fuel cell (SOFC) has been attractive as a way to solve global energy and environmental problems. Yttria-stabilized zirconia (YSZ) is mainly used as the electrolyte of SOFC. Its conductivity is strongly related with the power performance of SOFC. In the present study, we built an experimental device for fou…
Infrared radiation amorphous coatings based cordierite and ferrites for energy-saving were prepared on the surface of carbon steel by plasma spraying technology. The morphology, phase composition and structure of the composite infrared ceramics and coatings were investigated by scanning electron microscope and X-ray d…
An in situ W/NiTi(Nb)shape memory alloy composite with a nominal composition of Ni48Ti46Nb3W3(at.%)was fabricated by vacuum induction melting,forging and drawing.X-ray diffraction,scanning electron microscope and energy dispersive spectroscopy were employed to analyze the microstructures and tensile testing machine us…
Polyamide 6/SiO₂ (PA6/SiO₂) nanocomposites with varying amounts of SiO₂ were prepared by using a novel sol–gel technique. These nanocomposites were formed in situ by hydrolysis and through the condensation of tetraethoxysilane (TEOS) using formic acid with a small amount of water as the solvent for PA6. Observations o…
In recent years, prices of the metal raw material is remarkable, so decreasing the production costs of the metal products is required. Metal products are often produced by repeating the annealing and plastic working. The number of the repeating leads increasing the products cost. In the present study, in order to mini…
Mesoporous zeolites X and Y with FAU structure were hydrothermally synthesized using an organosilane surfactant (TPOAC) as mesopore-generating agent, which was added into the conventional synthesis system of the crystalline microporous aluminosilicates. X-ray diffraction, scanning electron microscope, high-resolution…
Bacteria and their extracellular substances are one of the important reasons of metal corrosion.As the composition of bacterial extracellular sustances is complicated, the corrosion behaviors of different components are also different. The corrosion of carbohydrates in bacterial extracellular substances on Q235 steel…
采用Ca(OH)2-H3PO4体系合成羟基磷灰石粉末,研究了原料粒度、pH值、磷酸滴加速率、反应物浓度、反应时间、反应温度及煅烧温度对合成粉体性能的影响。应用X射线衍射(XRD)和透射电镜(TEM)测试方法对合成粉体的组成、颗粒形貌进行表征。用Nano Measurer软件计算粉体的粒度分布。结果表明:Ca(OH)2原料粒度在75~100?m区间,反应物浓度为0.15 mol/L,磷酸的滴定速率是8 mL/s,pH值大于7.5,在0℃反应6 h后,前驱体经过750℃煅烧后可获得纯度、结晶度、分散性和颗粒度均较好的HA粉体。
Objective To prepare PLA-Rifapentinum microspheres( RifapM) for lung targeting and evaluate it's rule of rifapentinum release and lung targeting in mice. Methods Solvent volatilization was used to prepare lung targeting RifapM,and dynamic dialysis method was adopted to observe the rule of rifapentinum release. In vivo…
En esta tesis se analiza el comportamiento mecanico de laminados composites cruzados[0/90]T incidiendo fundamentalmente en los siguientes aspectos:Se propone un metodo basado en medidas de desplazamientos para determinar experimentalmente curvaturas de flexion y torsion de origen termico en laminados rectangulares obt…
以二硼化锆、硅和活性碳为原材料，在1850℃、20MPa条件下，采用反应热压烧结工艺制备出了SiC／ZrB2陶瓷基复合材料。研究了添加剂（硅和活性碳）含量对ZrB2陶瓷烧结行为和力学性能的影响。借助x射线衍射和扫描电镜分析了复合材料的物相组成和微观结构。研究结果表明：添加剂可以显著提高复合材料的烧结致密度和力学性能。复合材料的XRD衍射图谱中只有ZrB2和SiC的衍射峰。当添加剂含量为12wt％时，复合材料的弯曲强度和断裂韧性分别达到584MPa和7．25MPa·m1/2。显微结构分析表明，致密度的提高、晶粒粒径的减小以及断裂模式的转变是复合材料力学性能提高的主要原因。
Sericin content of raw silk has a significant effect on the economic efficiency of the silkreeling process and the qualities of raw silk. The objective of the present study was to analyze sericin content in raw silk from Bombyx mori L. cocoons with different fluorescent characteristics. The subject of study were 1998…
본 논문은 imde 염 중 하나인 LiFSI를 알루미늄 부식 없이 활용할 수 있는 방안에 대해 다룬다. LiFSI는 가장 많이 쓰이는 염인 LiPF6에 비해 열적 안정성이 매우 우수하다. 뿐만 아니라, 다른 열적 안정성이 우수한 Li 염들의 경우 LiPF6보다 이온 전도도가 낮기 때문에 다방면으로 활용되지 못한 반면, LiFSI 염은 LiPF6...