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排序方式: 共有178条查询结果,搜索用时 15 毫秒
91.
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93.
Keishi Sakamoto Atsushi Kasugai Masaki Tsuneoka Koji Takahashi Yukiharu Ikeda Tsuyoshi Imai Takashi Nagashima Mitsuru Ohta Tsuyoshi Kariya Kenichi Hayashi Yoshika Mitsunaka Yosuke Hirata Yasuyuki Itoh Yukio Okazaki 《International Journal of Infrared and Millimeter Waves》1997,18(9):1637-1654
A development of 170GHz/500kW level gyrotron was carried out as R&D work of ITER. The oscillation mode is TE31,8. In a short pulse experiment, the maximum power of 750kW was achieved at 85kV/40A. The efficiency was 22%. In the depressed
collector operation, 500kW/36%/50ms was obtained. The maximum efficiency of 40% was obtained at PRF=470kW whereas the power decrease by the electron trapping was observed. Pulse extension was done up to 10s at PRF=170kW with the depressed collector operation. The power was limited by the temperature increase of the output window. 相似文献
94.
Dr. Takashi Matsuo Kazuki Fukumoto Takuro Watanabe Prof. Dr. Takashi Hayashi 《化学:亚洲杂志》2011,6(9):2491-2499
H64D myoglobin mutant was reconstituted with two different types of synthetic hemes that have aromatic rings and a carboxylate‐based cluster attached to the terminus of one or both of the heme‐propionate moieties, thereby forming a “single‐winged cofactor” and “double‐winged cofactor,” respectively. The reconstituted mutant myoglobins have smaller Km values with respect to 2‐methoxyphenol oxidation activity relative to the parent mutant with native heme. This suggests that the attached moiety functions as a substrate‐binding domain. However, the kcat value of the mutant myoglobin with the double‐winged cofactor is much lower than that of the mutant with the native heme. In contrast, the mutant reconstituted with the single‐winged cofactor has a larger kcat value, thereby resulting in overall catalytic activity that is essentially equivalent to that of the native horseradish peroxidase. Enhanced peroxygenase activity was also observed for the mutant myoglobin with the single‐winged cofactor, thus indicating that introduction of an artificial substrate‐binding domain at only one of the heme propionates in the H64D mutant is the optimal engineering strategy for improving the peroxidase activity of myoglobin. 相似文献
95.
Takuro Abe 《代数通讯》2013,41(4):1193-1215
We introduce the family of B 2-type arrangements as a generalization of the classical Coxeter arrangement of type B 2 and consider the stability and the freeness of it. We show the freeness and (semi)stability are determined by the combinatorics. Moreover, we give a partial answer to the 4-shift problem, which is a conjecture on the combinatorics and geometry induced from the B 2-type arrangements. 相似文献
96.
For a graph G, a detachment operation at a vertex transforms the graph into a new graph by splitting the vertex into several vertices in such a way that the original graph can be obtained by contracting all the split vertices into a single vertex. A graph obtained from a given graph G by applying detachment operations at several vertices is called a detachment of graph G. While detachment operations may decrease the connectivity of graphs, there are several works on conditions for preserving the connectivity. In this paper, we present necessary and sufficient conditions for a given graph/digraph to have an Eulerian detachment that satisfies a given local edge-connectivity requirement. We also discuss conditions for the detachment to be loopless. 相似文献
97.
Kurihara Momo Yasutaka Tetsuo Aono Tatsuo Ashikawa Nobuo Ebina Hiroyuki Iijima Takeshi Ishimaru Kei Kanai Ramon Karube Zin’ichi Konnai Yae Kubota Tomijiro Maehara Yuji Maeyama Takeshi Okizawa Yusuke Ota Hiroaki Otosaka Shigeyoshi Sakaguchi Aya Tagomori Hisaya Taniguchi Keisuke Tomita Masatoshi Tsukada Hirofumi Hayashi Seiji Lee Sangyoon Miyazu Susumu Shin Moono Nakanishi Takahiro Nishikiori Tatsuhiro Onda Yuichi Shinano Takuro Tsuji Hideki 《Journal of Radioanalytical and Nuclear Chemistry》2019,322(2):477-485
Journal of Radioanalytical and Nuclear Chemistry - We assessed the repeatability and reproducibility of methods for determining low dissolved radiocesium concentrations in freshwater in Fukushima.... 相似文献
98.
Shigeki Matsuo Haruki Sumi Satoshi Kiyama Takuro Tomita Shuichi Hashimoto 《Applied Surface Science》2009,255(24):9758-9760
A femtosecond laser-assisted etching technique was applied to Pyrex glass, a kind of borosilicate glass, to perform removal processing with three-dimensional arbitrarity in design and micrometer-order spatial resolution. An aqueous solution of potassium hydroxide (KOH) was adopted as a highly selective etchant. The rate and selectivity of etching were evaluated from in situ images, and fabrication of three-dimensional microchannels was demonstrated. 相似文献
99.
By phase manipulation of a short laser pulse, it is possible to selectively generate ultracold excitons in a two-photon process while quenching the multiphoton excitation of hot electrons and holes. We show how this technique allows us to suppress the heating of n=1 orthoexcitons in Cu(2)O at high density. Using a laser pulse having an energy of a few microJ and duration of 100 fs, we are thus able to produce a cold exciton gas up to a density of 10(15) cm(-3). 相似文献
100.
Takuro Mochizuki 《Journal of Pure and Applied Algebra》2003,179(3):287-330
We calculate some quandle cohomology groups; the rational cohomology groups of any finite Alexander quandles, the second cohomology groups with a finite field coefficient of any finite Alexander quandles over a finite fields, and the third cohomology groups of the finite Alexander quandles of the form . 相似文献