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排序方式: 共有136条查询结果,搜索用时 15 毫秒
1.
SAMUEL S. SHINOZAKI JOHN E. NOAKES HIROSHI SATO 《Journal of the American Ceramic Society》1978,61(5-6):237-242
Reaction-sintered Sic specimens prepared at ∼1500°C and heat-treated at ∼1850°C in the presence of molten silicon were examined by transmission electron microscopy. The β-Sic grains in as-prepared specimens grew to a large size when heat-treated in the presence of molten Si; the number of growth twins in such °-Sic crystals was very small. The boundary areas of α- and β-Sic crystals were microsyntactic, consisting of thin strips of α- and β-Sic after heat-treating. These changes were due mostly to thin lamellar growth of α-Sic into β-Sic grains along the basal plane. There is also a high density of similar growth of transformation twins in β-Sic crystals. The results provide clear evidence of in situ solid-state transformations in sic. 相似文献
2.
介绍一种低温合成二氧化钛纳米粒子的新方法.将非晶型二氧化钛加入强酸性溶液中室温搅拌数小时后得到无色透明的溶液.继续在室温搅拌数48h后,可以得到高比表面的金红石相二氧化钛纳米粒子.改变处理过程温度及酸的种类,可以得到不同组成的纤维状二氧化钛纳米粒子.对盐酸体系进行详细讨论结果表明,在低于60℃时得到的是热力学稳定的金红石单一相,而在高于120℃时得到的是热力学亚稳态的锐钛矿单一相,高于170℃时得到的是锐钛矿及金红石的混合相,显示出与众不同的结晶行为.通过此低温法制备的金红石相二氧化钛在具有较小的吸收禁带的同时,还拥有100n2·g-1以上的比表面积.与锐钛矿相相比,显示了良好的可见光催化活性. 相似文献
3.
HARUHIKO SATO SHIN SAITO SHOTA MIZUNO KOICHI AKAHANE HIRONAGA UCHIDA 《Electrical Engineering in Japan》2017,198(3):27-33
The spin‐dependent scattering of conduction electron in metallic magnetic multilayers was investigated to reveal the optical properties which corresponded to the magnetization state. From the measurement of magnetorefractive effect in antiferro‐magnetically exchange coupled Co/Ru multilayers, it was found that (1) the transmittance varied around 1% at wavelength of 1550 nm during the parallel/antiparallel spin alignment changes, (2) as a result of number of repetition and Co thickness for the multilayers, transmittance difference between the parallel and antiparallel spin alignment states had trade‐off relationship with the magnitude of transmittance, and (3) asymmetric Co/Ru/Co stacking structure brought different interlayer exchange coupling fields in each layer, which resulted in magnetic field sensitive transmittance. 相似文献
4.
Crystalline Phase Change in Yttria-Partially-Stabilized Zirconia by Low-Temperature Annealing 总被引:1,自引:0,他引:1
Changes in the phase composition and microstructure of yttria-partially-stabilized zirconia by low-temperature annealing were investigated at 100° to 500°C using bodies sintered from coprecipitated fine ZrO2 -Y2 O3 powders at varied temperatures. Tetragonal zirconia on the surfaces of bodies sintered at <1500°C transformed to the monoclinic phase at 100° to 400°C. Transformation behavior was strongly affected by grain size. 相似文献
5.
6.
Ovalbumin freeze-dried with or without the addition of glucose was stored at 50°C and 65% relative humidity to study the effect of the Maillard reaction on some physical properties of ovalbumin. In the early stage of the reaction in which ovalbumin-glucose complexes were formed, there were soluble types of monomer and aggregates of which α-helix and available lysine contents were gradually decreased with length of storage and degree of aggregation. These compounds were characterized by properties possessing a marked resistance towards destruction of conformation and coagulation. With progress of the reaction, ovalbumin-glucose complexes changed to insoluble forms having higher particle weight and breakdown products. 相似文献
7.
X. LI T. KASAI S. NAKAO T. ANDO M. SHIKIDA K. SATO 《Fatigue & Fracture of Engineering Materials & Structures》2007,30(12):1172-1181
The influence of notches on the fracture of single crystal silicon thin films was investigated. The tests were conducted on notched and smooth tensile specimens micromachined on a silicon wafer. The specimen geometry was 100 μm long, 50 μm wide and 5 μm thick. For the notched specimen, a V‐shaped sub‐micrometer notch was introduced on one edge of it by using a focused ion beam (FIB) process. The notch lengths ranged from 0.07 to 1.3 μm. Four types of specimens with different surfaces and tensile orientations were tested. The smooth specimens showed scattered fracture strengths and ‘collapsed’ fractures. For the restrictive‐shaped notches, the critical length was 0.5 μm. The short‐notched (<0.5 μm) specimens also showed ‘collapsed’ fractures, and the stress concentrations on notch tips decreased their fracture strengths. For the long‐notched (>0.5 μm) specimens, the notch was equivalent to a crack in the Griffith model and the crack mainly propagated on {111} cleaved planes. 相似文献
8.
YANG Changping ZHOU Zhihui WANG Hao HU Jifan IWASA Kazuaki SUGAWARA Hitoshi SATO Hideyuki 《稀有金属(英文版)》2006,25(Z1)
Elastic neutron diffraction measurements were performed on single crystals to study the ground state below the mysterious exotic transition temperature 0.86 K. An antiferromagnetic order with a tiny moment of 0.027μB per formula is formedas the ground state for CeOs4Sb12 below the transition point. Our neutron data gives the evidence of spin density wave state for CeOs4Sb12 in this work. 相似文献
9.
Consideration of Stretchable Dry Electrodes for Smart Shirts Aimed for Biological Signal Monitoring 下载免费PDF全文
YUSAKU AMANO YASUNORI TADA TOMONOBU SATO SHIGERU SAITO MASAHIRO INOUE 《Electrical Engineering in Japan》2018,203(4):63-71
Dry electrodes of a smart shirt for measuring biological signals were prepared by the additive printing method using a stretchable conductive paste with Ag fillers loading. Interfacial impedance between the electrode and skin depended on the contact pressure of electrode and the moisture of stratum corneum. When moisture of stratum corneum was more than 30%, ECG could be measured using the stretchable electrodes printed on a compression shirt. However, noise signal in the ECG signal increased when the moisture of stratum corneum was less than 30%. To solve this problem, we propose to use additional electrodes made of an electrically conductive kneaded rubber. 相似文献
10.
HIROSHI SATO 《Catalysis Reviews》2013,55(4):395-424
Acidities of pentasil zeolites were measured and correlated with aluminum content using the following methods: (1) Acid-base indicator method, (2) NH3-TPD spectra, (3) GC pulse adsorption of pyridine and 4-methylquinoline, and (4) FTIR spectroscopy of adsorbed pyridine. By controlling the acidity of pentasil zeolites, we have succeeded in obtaining high catalytic performance both in paraselective dealkylation of cymenes and in vapor-phase Beckmann rearrangement of cyclohexanone oxime to ?-caprolactam. In the dealkylation, moderate acidity of Li-ZSM-5 was the key to avoid side reactions while keeping a high conversion of cymenes. In the Beckmann rearrangement, neutrality and crystallinity of the pentasil zeolite were keys to obtain a high lactam selectivity, and a high lactam selectivity of 95% was attained by the surface treatment with chlorotrimethylsilane. The active sites were elucidated to be neutral silanols on the external surface of zeolite. 相似文献