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1.
A novel diagram which describes the condition of 3 dB coupler is proposed. Using the proposed diagram, the design of a wavelength-flattened 3 dB directional coupler composed of a uniform coupled waveguide is investigated. Normalized waveguide parameters are introduced to characterize a five-layer planar waveguide. This enables us to generalize the discussion and to reduce the number of parameters required for characterizing a coupled waveguide. A broadband 3 dB coupler having 50±5% coupling ratio over a wavelength range of 1.1-1.7 μm is designed 相似文献
2.
3.
Nariaki Sakaba Kazuhiko Iigaki Masaaki Kondo Koichi Emori 《Nuclear Engineering and Design》2004,233(1-3):135
The containment structures of the HTTR consist of the reactor containment vessel, the service area, and the emergency air purification system, which minimise the release of fission products in postulated accidents, which lead to fission product release from the reactor facilities. The reactor containment vessel is designed to withstand the temperature and pressure transients and to be leak-tight in the case of a rupture of the primary concentric hot-gas duct, etc. The pressure inside the service area is maintained at a negative pressure by the emergency air purification system. The emergency air purification system will also remove airborne radioactivity and will maintain a correct pressure in the service area.The leak-tightness characteristics of the containment structures are described in this paper. The measured leakage rates of the reactor containment vessel were enough less than the specified leakage limit of 0.1%/d confirmed during the commissioning tests and annual inspections. The service area was kept in a way that the design pressure becomes well below its allowable limitation by the emergency air purification system, which filters efficiency of particle removal and iodine removal well over the limited values.The obtained data demonstrate that the reactor containment structures were fabricated to minimise the release of fission products in the postulated accidents with fission product release from the reactor facilities. 相似文献
4.
Song Chen Toshiyuki Ikoma Nobuhiro Ogawa Satoshi Migita Hisatoshi Kobayashi Nobutaka Hanagata 《Science and Technology of Advanced Materials》2010,11(3)
Novel type I collagen hybrid fibrils were fabricated by neutralizing a mixture of type I fish scale collagen solution and type I porcine collagen solution with a phosphate buffer saline at 28 °C. Their structure was discussed in terms of the volume ratio of fish/porcine collagen solution. Scanning electron and atomic force micrographs showed that the diameter of collagen fibrils derived from the collagen mixture was larger than those derived from each collagen, and all resultant fibrils exhibited a typical D-periodic unit of ∼67 nm, irrespective of volume ratio of both collagens. Differential scanning calorimetry revealed only one endothermic peak for the fibrils derived from collagen mixture or from each collagen solution, indicating that the resultant collagen fibrils were hybrids of type I fish scale collagen and type I porcine collagen. 相似文献
5.
The dimer and trimer obtained by the pyrolysis of poly(p-chlorostyrene) were 2,4-di(p-chlorophenyl)-1-butene and 2,4,6-tri(p-chlorophenyl)-1-hexene, respectively, while those obtained by the cationic oligomerization of p-chlorostyrene were trans-1,3-di(p-chlorophenyl)-1-butene and a diastereomeric pair of trans-1,3,5-tri-(p-chlorophenyl)-1-hexene. 相似文献
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7.
Tamamura M. Shiotsu S. Hojo M. Nomura K. Emori S. Ichikawa H. Akai T. 《Solid-State Circuits, IEEE Journal of》1992,27(11):1575-1578
A 9.5-Gb/s Si-bipolar ECL array that has a gate delay of 35 ps, a risetime of 45 ps, and a falltime of 40 ps is described. The ECL circuit design and the chip layout were optimized. A Si-bipolar process with 0.3-μm emitter width and packaging capable of accepting 10-GHz signal were used. The array was used in three key circuits of an optical communication system: a decision circuit, a 4:1 multiplexer, and a 1:4 demultiplexer. Operation of the decision circuit at 9.5 Gb/s, of the 4:1 multiplexer at 6.7 Gb/s, and of the 1:4 demultiplexer at 6.7 Gb/s were confirmed 相似文献
8.
Tatsuo Tabaru Jin-Hak Kim Kazuhisa Shobu Michiru Sakamoto Hisatoshi Hirai Shuji Hanada 《Metallurgical and Materials Transactions A》2005,36(3):617-626
Mo(Si,Al)2-base oxidation-resistant coatings for Nb-base structural materials have been studied. The coating is composed of a Mo(Si,Al)2-base Al reservoir and Al2O3 interlayer to suppress interface reactions between the Al reservoir and the substrate. To develop a suitable Al-reservoir
material, some Mo(Si0.6,Al0.4)2-HfB2 composites were prepared. Their oxidation resistance and coefficients of thermal expansion were investigated, in addition
to their chemical reactivity with the Nb substrate at high temperatures. As a result, Mo(Si0.6,Al0.4)2-20 vol pct HfB2 was selected as one of the satisfactory Al reservoirs. The introduction of a stable Al2O3 interlayer was attempted using a novel powder metallurgical process to overlay the Nb substrates with the Al reservoir, where
the Nb substrates were subjected to a slight surface oxidation prior to the coating process. The Nb specimens, which are thoroughly
coated with the Al reservoir and Al2O3 interlayer, can be successfully fabricated by this method. The coated Nb specimens are not damaged at all after prolonged
exposure in flowing Ar-20 pct O2 at 1673 K for 120 hours. Furthermore, the Al2O3 interlayer is very effective and no reactions occur at the interface. Thus, this Mo(Si,Al)2-base oxidation-resistant coating is applicable to Nb. The utility of the coating system is also confirmed for a NbSS/Nb5Si3 composite.
This article is based on a presentation made in the symposium entitled “Beyond Nickel-Base Superalloys,” which took place
March 14–18, 2004, at the TMS Spring meeting in Charlotte, NC, under the auspices of the SMD-Corrosion and Environmental Effects
Committee, the SMD-High Temperature Alloys Committee, the SMD-Mechanical Behavior of Materials Committee, and the SMD-Refractory
Metals Committee. 相似文献
9.
An instrument for the measuring method reported in the previous paper is a handy tester for three thermophysical parameters of solids in situ. Discussions about measurement errors caused by not strictly satisfying the measuring conditions, such as size and shape of the testing body, and about optimum initial temperature difference between thermal probe and testing body have been done. As a result of the experiment varying the shape of a probe end, it is shown that the radius of the contacting surface on a testing body has no influence on measuring thermophysical parameters. © 2003 Wiley Periodicals, Inc. Heat Trans Asian Res, 32(3): 202–211, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.10085 相似文献
10.
A four-framing Mach-Zehnder interferometer system which has variable intervals from frame to frame is developed. TEA N(2) lasers that are operated with atmospheric-pressure N(2) gas are employed as light sources. Applicability of the system is demonstrated for a rapidly changing plasma in the plasma focus discharge. 相似文献