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排序方式: 共有75条查询结果,搜索用时 46 毫秒
41.
Keita TaniguchiNoriyuki Okinaka Tomohiro Akiyama 《Journal of Alloys and Compounds》2011,509(10):4084-4088
This paper proposes La1−xKxFeO3 prepared by self-propagating high-temperature synthesis (SHS) as an alternative to platinum catalysts for promoting diesel soot combustion. The catalytic property of eleven products SHSed with different substitution ratios of potassium (x = 0-1) was experimentally evaluated using a thermobalance. In the mass loss curves of the product, T50 was defined as the temperature at which the weight of the reference soot decreases to half its initial weight. The BET specific surface area of SHSed La1−xKxFeO3 depended on x strongly. All the products showed good oxidation catalytic activity. Despite having the smallest surface area (0.11 m2/g) among the obtained products, La0.9K0.1FeO3 (x = 0.1) was found to be the best catalyst with the lowest T50 (442 °C). T50 of La1−xKxFeO3 decreased with increasing x for x > 0.2. The products with x = 0.6 and 0.8 were the second-best catalysts in terms of their T50. Moreover, average apparent activation energy of La0.9K0.1FeO3 (x = 0.1) calculated by Friedman method using TG was as much as 61 kJ/mol lower than that of Pt/Al2O3 catalyst. In conclusion, potassium-substituted SHSed La1−xKxFeO3 can be used as an alternative to Pt/Al2O3 for soot combustion. 相似文献
42.
N Nakamura K Shino T Natsuume S Horibe N Matsumoto Y Kaneda T Ochi 《Canadian Metallurgical Quarterly》1998,5(9):1165-1170
To define the early biological effect of in vivo introduction of the PDGF-B gene on the healing of ligaments, a HVJ-liposome suspension containing platelet-derived growth factor (PDGF)-B cDNA was injected directly into the injured patellar ligament of 14-week-old male Wistar rats. Rats were killed at 1, 4 and 8 weeks for the morphological analysis of angiogenesis by laminin immunohistochemistry and of collagen deposition by Masson's Trichrome staining and collagen I immunohistochemistry. PDGF-B gene transfer caused the enhanced expression of PDGF in healing ligament up to 4 weeks after transfection, leading to an initial promotion of angiogenesis and subsequent enhanced collagen deposition in the wound. Enhanced and accelerated matrix synthesis in the PDGF-B gene introduced healing ligament suggests that this gene transfer technique may be a potentially useful tool for improving soft tissue repair. 相似文献
43.
Etoh T.G. Poggemann D. Kreider G. Mutoh H. Theuwissen A.J.P. Ruckelshausen A. Kondo Y. Maruno H. Takubo K. Soya H. Takehara K. Okinaka T. Takano Y. 《Electron Devices, IEEE Transactions on》2003,50(1):144-151
An image sensor for a video camera of 1000000 frames per second (fps) was developed. The specifications of the developed sensor are as follows: 1) frame rate: 1000000 fps; 2) pixel count: 81 120 (=312/spl times/260) pixels; 3) total number of successive frames: 103 frames; 4) gray levels: 10 b; and 5) open area of each pixel (fill factor): 580 square micrometers (13%). The overwriting function is installed for synchronization of image capturing with occurrence of the target event. Sensitivity is significantly high with the large photogate. Some innovative technologies were introduced to achieve ultrahigh performance, including slanted linear CCD in situ storage, curving design procedure, and a CCD switch with fewer metal shunting wires. They are applicable to the development of other new high-performance image sensors. 相似文献
44.
Hideaki Agura Hirokazu Okinaka Shigeyasu Hoki Takanori Aoki Akio Suzuki Tatsuhiko Matsushita Masahiro Okuda 《Electrical Engineering in Japan》2005,151(2):40-45
Al2O3‐doped ZnO (AZO) thin films have been deposited onto glass substrates using a split target consisting of AZO (1 wt%) and AZO (2 wt%) by pulsed laser deposition with an ArF excimer laser (λ = 193 nm, 15 mJ, 10 Hz, 0.75 J/cm2). By applying a magnetic field perpendicular to the plume, the lowest resistivity of 8.54 × 10?5Ω·cm and an average transmittance exceeding 91% over the visible range were obtained at a target‐to‐substrate distance of 25 mm for approximately 279‐nm‐thick AZO film (1.8 wt%) grown at a substrate temperature of 230 °C in vacuum. From cross‐sectional TEM observations and the XRD spectrum, a reason why the low resistivity (54 × 10?5Ω·cm) was reproducibly obtained was considered to be due to the fact that a disorder of crystal growth originating in the vicinity of the interface between the substrate and the film was suppressed by application of the magnetic field and the c‐axis orientation took preference, giving rise to the increase of mobility. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 151(2): 40–45, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20026 相似文献
45.
Tomomi Kobayashi Miharu Kamimura Shino Imai Chihiro Toji Naoko Okamoto Mitsuru Fukui Chigusa Date 《Nutrition journal》2011,10(1):27
Background
A previous study reported the development a 75-item food frequency questionnaire for Japanese children (CFFQ). The first aim was to examine the reproducibility and validity of the CFFQ in order to assess dietary intake among two groups; 3-11 year old children (YC group) and 12-16 year old children (AD group). The second aim was to use the CFFQ and the FFQ for adults (AFFQ), and to determine which was better suited for assessing the intake of children in each group. 相似文献46.
Hideki Kohn Tatsunori Shino Yuki Ohshima Takaaki Manaka Mitsumasa Iwamoto 《Thin solid films》2009,518(2):2479-844
By irradiating evaporated 10,12-pentacosadiynoic acid (p-DA) monomer film with circularly polarized light (CPL), we prepared chiral poly(diacetylene) [PDA] film. The circular dichroism (CD) was obtained reproducibly, depending on the rotational direction of the CPL. The induced chirality showed the dependence on the substrate temperature used for the preparation of evaporated p-DA monomer films, and it was stable after the transition to red-phase by annealing. Results suggest that side chain of polymer made a significant contribution to the formation of red-phase chiral PDA. 相似文献
47.
Naoto YasudaTohru Tsuchiya Shino SasakiNoriyuki Okinaka Tomohiro Akiyama 《International Journal of Hydrogen Energy》2011,36(14):8604-8609
In this paper, we describe the self-ignition combustion synthesis (SICS) of LaNi5 utilizing the hydrogenation heat of metallic calcium at different hydrogen pressures, and focus on the effect of hydrogen pressure on the ignition temperature and the initial activation of hydrogenation. In the experiments, La2O3, Ni, and Ca were dry-mixed, and then heated at 0.1, 0.5, and 1.0 MPa of hydrogen pressure until ignition due to the hydrogenation of calcium. The products were recovered after natural cooling for 2 h. The results showed that the ignition temperature lowered with hydrogen pressure. The products changed from bulk to powder with hydrogen pressure. This was probably caused by volume expansion due to hydrogenation at higher pressure. The product obtained at 1.0 MPa showed the highest hydrogen storage capacity under an initial hydrogen pressure of 0.95 MPa. The results of this research can be applied as an innovative production route for LaNi5 without the conventional melting of La and Ni. 相似文献
48.
T Kinoshita H Shirasawa Y Shino K Shimizu H Moriya B Simizu 《Canadian Metallurgical Quarterly》1996,42(1-2):119-125
Signs of acute respiratory distress were reported in moulting grey seals (Halichoerus grypus) hauled out on Lady's Holm, Shetland, following the Braer oil spill in January, 1993. Behavioural observations carried out between 16 January and 13 February 1993 showed that the proportion of animals exhibiting a discharge of nasal mucus was significantly higher than the proportion at a control site in the north (Papa Stour). The proportion of animals affected on Lady's Holm increased for up to one month following the spill. However, the time lag between exposure and peak response was approximately 30 days, longer than may be expected for an acute effect. The proportion of non-specific signs of respiratory distress in unexposed Shetland seals was assessed from observations made between 16 January and 25 January 1994. Symptoms similar to those seen in 1993 were also reported during this period, but the proportion of affected animals was higher in 1993. Symptoms were not observed at a grey seal moult site on the east coast of England in March 1993 and 1994. Grey seals moulting in Shetland during the time of the oil spill may have been acutely affected by exposure to hydrocarbons, but without sufficient baseline data on the occurrence of respiratory distress in grey seals it is difficult to determine the proportion attributable to other causes. 相似文献
49.
I Ozkan K Nakata S Nakagawa Y Toritsuka T Natsu-ume K Shino 《Canadian Metallurgical Quarterly》1997,13(6):767-769
The avulsion fracture of the tibial attachment site of the anterior cruciate ligament is relatively rare among adults. Although partial avulsion fracture of this site is very rare, complex forces exerted on the knee joint could produce this type of fracture. We report on an adult patient with an avulsion fracture of the attachment site of anteromedial bundle of the anterior cruciate ligament associated with injuries of lateral and medial collateral ligament and fibular fracture. We speculate varus stress in a flexed knee coupled with rotation between the femur and tibia caused this type of injury. 相似文献
50.