Materials Literature
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We investigate experimentally and theoretically the trapping of micro-and nanoparticles in the evanescent field surrounding a tapered optical fiber. We calculate the field distribution for optical fibre modes as the fiber diameter approaches cut-off, and show how combinations of modes may be used to control trapped pa…
This study systematically investigated the influence of cold-rolling on the crystallographic texture and mechanical properties of pure titanium and their anisotropy. Pure titanium was hot-rolled in plates and annealed for recrystallization. The plates were further cold-rolled by reducing the thickness by 30 %, 50 %, a…
The hydrogen sensing performance of the thermoelectric gas sensor has been reported for the analysis to several hundreds ppm H_2 in human breath. The sensor is a micro calorimeter converting the heat of gas combustion at catalyst into thermoelectric voltage, and it is necessary to suppress the noise from thermal fluct…
Досліджено електричні, оптичні та фотоелектричні властивості халькогенідних монокристалів твердих \nрозчинів CuInS2 ZnIn2S4, одержаних у хімічних лабораторіях ВНУ. Встановлено особливості електро- і \nфотопровідності монокристалів CuInS2 ZnIn2S4 у широкому інтервалі температур (77 300 К). Зміна складу \nтвердого розчи…
Institute of Fluid Science, Tohoku University Katahira 2-1-1, Aoba-ku, Sendai, 980-8577, JapanChemical vapor deposition (CVD) diamond film is well known as the material of high hardness, good wear resistance and so on. It is suitable for the maintenance free solid lubrication film for sliding bearing, but as-deposited…
This paper is focused on the preparation and characterization of Cu2O nanoparticles via simple wet chemical route. Samples were characterized by SEM and XRD. These nanoparticles were used for fabrication of spraying working electrodes for electrochemical detection of purine bases in DNA.
分别采用包埋法、料浆法在碳/碳（C/C）复合材料表面制备了碳化硅（SiC）内涂层、W-Al-Si合金外涂层,借助XRD和SEM分析了所得涂层的物相组成和微观结构,并测试了带有单一SiC涂层、SiC/W-Al-Si双涂层碳/碳复合材料试样在1500℃静态空气中的抗氧化性能。结果表明：富Si的SiC内涂层结构疏松,仅能为碳/碳基体提供数小时的防氧化保护;W-Al-Si合金外涂层主要由WSi2和W（Si,Al）2两相组成;SiC/W-Al-Si双涂层厚度约为100μm,其抗氧化性能明显优于单一SiC涂层,氧化19 h后涂层试样的质量损失未超过5%;有望进一步通过优化W-Al-Si外涂层料浆比例,避免因为与SiC内涂层热膨胀不匹配而产生透…
用固相反应法制备了La0.4Ca0.6Mn1-xCrxO3（x=0.00,0.02,0.04,0.06,0.08,0.10,0.15）多晶样品,通过X射线衍射（XRD）图谱、磁化强度-温度（M-T）曲线、电子自旋共振（ESR）谱线,研究了Cr替代Mn对La0.4Ca0.6MnO3磁性质的影响.实验结果表明：La0.4Ca0.6MnO3存在复杂的磁结构,在258 K出现电荷有序相,从175 K到50 K,产生强关联CO-AFM（电荷有序？反铁磁）相,温度降到41 K左右出现自旋玻璃态;当替代量x≥0.06时,电荷有序相被融化;当x≥0.10时,自旋玻璃态被融化.对实验结果进行了初步解释：电荷有序相被融化主要原因是Cr3＋与Mn4＋具…
To reduce the cost of carbon reinforced polymer (CFRP) the sandwich structural composite (CFRP/ABS/CFRP) has been proposed and successfully developed. The Charpy impact value at room temperature of CFRP/ABS/CFRP is approximately equal to that of CFRP. The heating improves the CFRP/ABS/CFRP as well as CFRP. The maximum…
Mg alloy has a lot of useful properties and its application has been enlarged to various industrial products. However, it has poor corrosion resistance and therefore surface treatment is necessary. In this study, zinc oxide film formation is tried on magnesium alloy surface with RF oxygen plasma in order to improve co…
Досліджено монокристали твердих розчинів 50 %мол. AgGaGeS4 + 50мол.% AgGaGe3Se8. Внаслідок \nстатистичного розміщення у вузлах кристалічної гратки атомів Ga і Ge, а також наявності вузлів, не заповнених \nатомами Ag, тверді розчини проявляють властивості невпорядкованих напівпровідників з максимальною \nщільністю лока…
In this study, a MDS specimen which a uniform distribution of shear stress can be realized by using comparatively simple testing device is studied for impact shear deformation of TRIP steel. The shape and size of the specimen for an appropriate measurement of its impact shear deformation are determined by FEM. Then, a…
In order to reveal static recrystallization in a single crystal metal, we investigate nucleation and growth behaviors of an individual recrystallized grain in a single crystal copper by using the nano plastic forming (NPF). First, the NPF which is a direct indentation of a diamond tool is performed to a single crystal…
The purpose of this study is to analyze the drag coefficient of three dimensional objects in accelerated motions. The drag coefficient of the fundamental objects are usually observed under steady flow. Many researchers have expressed the effect of unsteadiness by an added mass or impulse force, however the unsteady dr…
Monolithic oxide-metal composite thermoelectric generators were fabricated using multilayer co-fired ceramics technology. These devices consisted of Ni_<0.9>Mo_<0.1> and La_<0.035>Sr_<0.965>TiO3 as p- and n-type thermoelectric materials, and Y_<0.03>Zr_<0.97>O_2 was used as an insulator, sandwiched between p- and n-ty…
The cost of PEFC (Polymer Electrolyte Fuel Cell) vehicle should be reduced to spread widely, and to realize cost reduction, high current density operation under the condition of high temperature and low humidification is required. It is important for reduction of ohmic loss at the severe operating conditions to evalua…
In this report, we conduct a multi-physics simulation coupling dislocation patterning with crystal deformation. We use reaction-diffusion equations for dislocation patterning of cell and subgrain. We derive interaction equations between dislocation field and internal stress field induced by long-range dislocation stru…
This paper presents the nonproportional low cycle fatigue life for oxygen-free high conductivity copper. Strain controlled tension-torsion low cycle fatigue tests were performed using hollow cylinder specimens under four strain paths: push-pull, torsion, combined tension-torsion and 90 deg. out-of-phase strain paths.…
The wetting characteristics of micro-droplets of distilled water on natural mica were observed with an atomicforce microscope(AFM)in AC non-contact mode.The obtained results show that the nano-size water droplets arevery stable in ambient air and more wettable than ordinary water droplets.The purpose of this paper is…
Protective coatings have been used in gas turbine blades and combustors. The resonance ultrasound spectroscopy method by the needle-transducer tripod was used in order to clarity all the elastic moduli of the protective coating. Following results were obtained from the measurement of atmospheric-plasma-sprayed CoNiCrA…