Materials Literature
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NMR Spektroskopie ist eine oft vewendete Methode, um Strukturen von Molekuelen und Festkoerpern zu untersuchen und zu bestimmen. In dieser Masterarbeit wird der Fokus auf Festkoerper-NMR Spektroskopie gelegt. Die Resultate der experimentellen chemischen Verschiebungen mit den theoretisch berechneten chemischen Abschir…
In this project, ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIMAc) was used in the spinning of regenerated cellulose micron fiber. EMIMAc is a better candidate for dissolving cellulose for the production of regenerated cellulose fiber because it has a lower melting point than 1-Butyl-3-methylimidazolium Chlori…
目的：制备聚L-乳酸（PLLA）复合纳米羟基磷灰石（n-HA）的新型人工骨材料,并对复合材料的性能进行研究。方法：采用熔融共混法,将PLLA与不同配比的n-HA进行复合,制备得到新型复合材料,并进行力学性能测试、显微结构观察,体外降解试验等项目的研究。结果：当掺入n-HA粉末含量为20%时,PLLA/n-HA复合材料的抗弯强度可以增加到最大值,材料断口的形貌随着n-HA含量的增加表现为不同的脆性断裂特征,复合材料降解液的pH值和力学强度的降低时间较纯PLLA滞后,降解速度减缓。结论：PLLA/n-HA复合材料可明显提高单一材料的力学性能,并可减轻降解过程中酸性产物引起的炎症反应,保持较好的初始力学强度,有望成为一种理想的骨缺损修复…
The corrosion of 13Cr tubing in a gas well was investigated and roundly inspected,and the tubing corrosion distribution status and corrosion concentration position of the tubing were obtained.It is considered that the tubing corrosion was due to CO2,Cl-and water.Some measures for preventing tubing from corrosion were…
Nanoparticle research is, at the moment, one of the most studied branches of science and is emerging as one of the fastest growing areas which includes different fields such as biology, medicine, optics, electronics or pharmaceutical technology, among others. In the last few years, it has emerged as a strategy, in pha…
The cell with in-plane electrodes filled with a nematic liquid crystal (NLC) is considered. Rigorous analytical expression for the spatial distribution of electric field across a cell is retrieved. In one-constant approximation of the continual theory the method of Rietz allows evaluating distribution of the director…
The main objective of this study was to evaluate the effects of polymeric betaine( PB) on the fire retardant performance of oriented strand board( OSB) treated with 12% of boric acid-borax( 1∶ 1). The panels were produced with phenol formaldehyde resin. The fire retardant performance of OSB was studied by cone calorim…
A novel numerical method based on the magnetic vector potential is proposed to calculate stator end leakage inductances of the multiphase induction machine with the conic angle of end-windings taken into consideration. To acquire the leakage inductances between end-windings, the flux is obtained by a line integral of…
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…