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排序方式: 共有130条查询结果,搜索用时 11 毫秒
1.
Fumitaka Tsukihashi Toshiyuki Hatta Eiji Tawara 《Metallurgical and Materials Transactions B》1996,27(6):967-972
The deoxidation equilibrium of molten titanium and titanium-aluminum alloys saturated with solid CaO has been measured in the temperature range from 1823 to 2023 K. The equilibrium constant of reaction CaO (s)=Ca (mass pct in Ti,Ti-Al)+O (mass pct in Ti,Ti-Al) and the interaction parameter between calcium and oxygen were determined for Ti, TiAl, and TiAl3. The standard Gibbs energy of reaction for TiAl was obtained as follows: $$\Delta G^\circ = 279,000 - 103TJ/mol$$ The possibilities for the deoxidation of titanium and titanium-aluminum alloys by using calcium-based fluxes are discussed. 相似文献
2.
H Zhang T Hatta J Udagawa K Moriyama R Hashimoto H Otani 《Canadian Metallurgical Quarterly》1998,139(7):3306-3315
To establish an in vivo experimental system for developmental endocrinology research, AtT-20 cells, a corticotropic tumor cell line, were transplanted by exo utero manipulation into mouse embryos on embryonic day 14. The induced tumor secreted ACTH in situ, and the circulating ACTH level was elevated. This was the first model for studying the regulation of ACTH in the mouse fetal adrenal in vivo and the first continuous ACTH treatment model in rodent fetuses. The changes in the adrenal gland from the tumor-induced embryos were analyzed by light microscopic morphometry, immunohistochemistry for steroidogenic enzymes, and electron microscopy. In the treated adrenal, the volume of the inner cortical zone was significantly larger than that in controls. In the inner zone, cell density was decreased, and average cell size was increased, whereas bromodeoxyuridine-incorporation was not increased. The enlarged inner zone cells expressed an enhanced level of cytochrome P45011beta, the corticosterone-synthesizing enzyme, and the serum corticosterone level was increased. Electron microscopy showed an active form of the organelles involved in steroidogenesis. These findings indicate that ACTH stimulates both adrenocortical hypertrophy and steroidogenesis in fetal mice. Potential perspectives of the novel paradigm in this research for molecular developmental endocrine study are discussed. 相似文献
3.
Normal-incidence infrared absorption has been observed for silver overlaid C(60) thin films formed on surface-oxidized Si(111) substrates as a function of the silver or C(60) film thickness. The absorption spectra exhibit bands at 1429 and 1180 cm(-1) due, respectively, to the infrared active T(lu) (4) and T(lu) (3) modes of C(60) in multi-layers. Additionally, two bands appear at 1442 and 1370 cm(-1). The former band is caused by activation of the infrared inactive (Raman active) A(g) (2) mode via electron transfer from the silver to adsorbed C(60), and the latter is assigned to the T(1u) (4) mode red-shifted by the charge transfer. These bands are all enhanced in intensity dependent either upon the silver or C(60) thickness, i.e., the largest absorption enhancement is obtained for 25-monolayers-thick silver and 12-nm-thick C(60). Under atomic force microprobe inspection, the average size and height of the islands in the overlaid 25-monolayers-thick silver change with underlying C(60) film thickness. The influence of the C(60) film structure upon the silver film and in turn the absorption intensity is strongly suggested. 相似文献
4.
Al Amin A. Shimizu K. Takenaka M. Tanemura T. Inohara R. Nishimura K. Horiuchi Y. Usami M. Takita Y. Kai Y. Aoki Y. Onaka H. Miyazaki Y. Miyahara T. Hatta T. Motoshima K. Kagimoto T. Kurobe T. Kasukawa A. Arimoto H. Tsuji S. Uetsuka H. Nakano Y. 《Photonics Technology Letters, IEEE》2007,19(10):726-728
We report a bit-rate transparent optical burst switching (OBS) router prototype using a fast 5 times 5 PLZT [(Pb,La)(Zr,Ti)O3 ] optical matrix switch. Dynamic switching in a two-wavelength, 2 times 2 OBS switch is demonstrated. Contention resolution using a tunable Mach-Zehnder interferometer wavelength converter for both 40- and 10-Gb/s bursts is demonstrated for the first time. Error-free operation was achieved for both bit rates under the same settings, as required in autonomous networks 相似文献
5.
Hatta T. Miyahara T. Miyazaki Y. Takagi K. Matsumoto K. Aoyagi T. Motoshima K. Mishina K. Maruta A. Kitayama K. 《IEEE journal of selected topics in quantum electronics》2007,13(1):32-39
A polarization-insensitive monolithic 40-Gbps semiconductor optical amplifier (SOA)-Mach-Zehnder interferometer wavelength converter has been developed. Based on the photon-electron rate equation, we optimized the dimensions of the waveguide structure to maximize the field confinement in the active layer. An InGaAsP active layer with narrow SOA waveguide effectively enables polarization-insensitive high-speed wavelength conversion. High-precision wafer processing technique enabled the fabrication of submicrometer-wide active waveguides with low current leakage. Input waveguide arrays were fabricated at intervals of 25 mum and mounted in a module with two-lens aspherical lens optics. The 40-Gbps nonreturn-to-zero wavelength conversion experiment demonstrates a clear eye opening over full C-band operation 相似文献
6.
This paper treats the upper-bound approach to the problem of rigid-plastic deformation in case where the configuration of
the deformation zone is previously unknown. The plane strain forward extrusion process with the so-called dead metal zone
is analysed by assuming a simple velocity field. The calculations are carried out for the material with or without strain
hardening or strain rate sensitivity and for various reduction ratios. The numerical results show that the region of the dead
metal zone becomes smaller with the increase in the reduction ratio. The calculated punch forces agree with the experimental
ones fairly well. Furthermore, it is found that the dead metal zone becomes larger with increasing the strain hardening as
well as the strain rate sensitivity of the material. 相似文献
7.
8.
Tomoki Okata Kiyotaka Asanuma Kenichiro Nakagawa Waku Hatta Tomoyuki Koike Akira Imatani Atsushi Masamune 《International journal of molecular sciences》2022,23(22)
An unidentified cause of functional dyspepsia (FD) is closely associated with medication resistance. Acid suppression is a traditional and preferential method for the treatment of FD, but the efficacy of this treatment varies between epigastric pain syndrome (EPS) and postprandial syndrome (PDS): it is efficient in the former but not much in the latter. Transepithelial electrical resistance (TEER), a surrogate of mucosal barrier function, was measured under pH 3 and pH 5 acidic conditions using duodenal biopsy specimens obtained from the patients with EPS and PDS and asymptomatic healthy controls. The infiltration of inflammatory cells to the duodenal mucosa was accessed by immunohistochemical analysis. The duodenal mucosal TEER in EPS patients was decreased by exposure to the acidic solution compared to that of the controls and the PDS patients. The decrease in TEER of the EPS patients was observed even under pH 5 weak acidic condition and was correlated to degree of the epigastric pain. Moreover, the duodenal mucosa of EPS patients presented an increase in mast cells and plasma cells that expressed Ig-E. Duodenal mucosal vulnerability to acid is likely to develop EPS. 相似文献
9.
Infrared transmission spectra of C60 multilayers on thin Pd films deposited onto surface-oxidized Si(100) and hydrogen-terminated Si(111) substrates are reported. In both cases, the spectra in the 1500–1100 cm−1 region exhibited bands at 1444, 1429, and 1182 cm−1 due, respectively, to the Ag (2), T1u (4), and T1u (3) modes. The appearance of the Ag (2) mode, which is originally infrared inactive (Raman active), reveals electron transfer from the metal to chemisorbed C60. Indeed, increasing the thickness of C60, the Ag (2) mode intensity saturated more rapidly than the T1u (4) and T1u (3) modes. The originally infrared active T1u (4) and T1u (3) modes were enhanced in intensity depending upon the Pd thickness. Actually, while both substrates gave nearly the same magnitude of enhancement, the optimum Pd thickness was smaller on the hydrogen-terminated surface than on the surface-oxidized surface. On the other hand, the Ag (2) mode was less intense on the hydrogen-terminated surface than on the oxidized surface, suggestive of a shortage of chemisorbed C60 and thus pointing out the importance of the metal film morphology. Indeed, Pd films deposited on the two substrates gave rise to quite different AFM images. We also show that, regardless of the substrate, the Ag (2) mode is an order of magnitude smaller than for Ag deposition, though no remarkable intensity differences were observed with respect to the T1u (4) and T1u (3) modes. 相似文献
10.