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1.
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 《Journal of Infrared, Millimeter and Terahertz 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
2.
We have developed a custom analog CMOS circuit to perform the signal processing for an optical coherence tomography imaging system. The circuit is realized in a 1.5 /spl mu/m low-noise analog CMOS technology. The circuitry extracts the Doppler frequency from the signal and electrically mixes this with the original signal to provide a filtered A-scan. The circuitry was used to produce a two-dimensional image of an onion. 相似文献
3.
Kyoji Kariya Yoshikazu Kanazawa Tadatsugu Hirose 《Journal of the Society for Information Display》2002,10(1):11-16
This paper describes the Alternate Lighting of Surfaces (ALIS) method as a promising drive technology which can lead to high‐resolution plasma‐display panels (PDPs). This technology provides a resolution of more than 1000 scanning lines without lowering luminance, thus enabling the essential requirements of HDTV. Moreover, it allows the number of scanning electrodes to be halved in comparison with the conventional method, as well as the circuit scale to be minimized due to the use of the single scanning drive. The ALIS method is expected to be a key technology that will help PDPs penetrate the TV market. 相似文献
4.
T. Kosaka N. Iwase S. Fujimoto T. Masuda K. Ohira M. Amatsu F. Namiki M. Ishigaki H. Ohtaka Y. Kimura J. Okayasu N. Matsui K. Umehara T. Kishi K. Kariya H. Ohki K. Irie 《Journal of the Society for Information Display》2002,10(2):163-167
We developed the world's smallest‐profile 32‐in. HDTV PDP. By improving the luminous efficiency, a luminance of 650 cd/m2 and power consumption (discharge and driving circuit) of 200 W or less was achieved. Moreover, incorporating an advanced color compensating (ACC) filter improved the PDP's color‐reproduction capability, better than that of CRTs. 相似文献
5.
Effect of silver content on thermal fatigue life of Sn-xAg-0.5Cu flip-chip interconnects 总被引:5,自引:0,他引:5
Shinichi Terashima Yoshiharu Kariya Takuya Hosoi Masamoto Tanaka 《Journal of Electronic Materials》2003,32(12):1527-1533
The thermal fatigue properties of Sn-xAg-0.5Cu (x=1, 2, 3, and 4 in mass%) flip-chip interconnects were investigated to study
the effect of silver content on thermal fatigue endurance. The solder joints with lower silver context (x=1 and 2) had a greater
failure rate compared to those with higher silver content (x=3 and 4) in thermal fatigue testing. Cracks developed in the
solders near the solder/chip interface for all joints tested. This crack propagation may be mainly governed by the nature
of the solders themselves because the strain-concentrated area was similar for tested alloys independent of the silver content.
From the microstructural observation, the fracture was a mixed mode, transgranular and intergranular, independent of the silver
content. Higher silver content alloys (x=3 and 4) had finer Sn grains before thermal cycling according to the dispersion of
the Ag3Sn intermetallic compound, and even after the cycling, they suppressed microstructural coarsening, which degrades the fatigue
resistance. The fatigue endurance of the solder joints was strongly correlated to the silver content, and solder joints with
higher silver content had better fatigue resistance. 相似文献
6.
Keratan sulfate (KS) is a glycosaminoglycan consisting of repeating disaccharide units composed of alternating residues of d-galactose and N-acetyl-d-glucosamine linked beta-(1-4) and beta-(1-3), respectively. In this study, electrospray ionization tandem mass spectrometry (ESI-MS/MS) was employed to identify keratan sulfate oligosaccharides. Two nonsulfated disaccharide isomers and two monosulfated disaccharide isomers were distinguished through MS/MS. In MS(1) spectra of multiply sulfated KS oligosaccharides, the charge state of the most abundant molecular ion equals the number of sulfates. Subsequent MS(2) and MS(3) spectra of mono-, di-, tri-, and tetrasulfated KS oligosaccharides and sialylated tetrasaccharides reveal diagnostic ions that can be used as fingerprint maps to identify unknown KS oligosaccharides. Based on the pattern of fragment ions, the compositions of an oligosaccharide mixture from shark cartilage KS and of two enzyme digests of bovine corneal KS were determined directly, without prior isolation of individual oligosaccharides by HPLC or other methods. 相似文献
7.
The acquisition of information on the relation between flow speed and jam conditions of automobile traffic flow on express ways is necessary to achieve appropriate traffic flow. It is very difficult to use a large number of measuring points on a road, so in practice a grasp of the situation is achieved by measuring the flow conditions at a small number of measuring points. This paper deals with the application of a graphical interpolation method to the minimized number of measuring points in order to estimate the spatial density field of flow concentration. The traffic flow is expressed as a compressive flow, and this model is analyzed by a nonlinear equation. The results are given by the combination of characteristic lines and the propagation of a shock wave. 相似文献
8.
The polycrystalline silver after pre-treated with oxygen at high temperature was found to show excellent activity and selectivity in the process of direct dehydrogenation of methanol to anhydrous formaldehyde and the active oxygen species for this reaction was observed and proposed as the active centeres with in situ Raman scattering. 相似文献
9.
Yoshiharu Kariya Yasunori Hirata Masahisa Otsuka 《Journal of Electronic Materials》1999,28(11):1263-1269
Quad Flat Pack (QFP) Leads/Sn-3.5Ag-X (X=Bi and Cu) joint was thermally cycled between 243 K and 403 K or 273 K and 373 K,
and both metallographic examination and mechanical pull test were performed to evaluate thermal fatigue damage of the joint.
The addition of bismuth drastically degrades the thermal fatigue resistance of Sn-3.5Ag solder. On the other hand, the pull
strength of Sn-3.5Ag-Cu solder joints slightly decreased with increasing number of thermal cycles, though it still remains
higher in comparison to that for conventional Sn-37Pb or bismuth containing solder joint. The behavior observed here reflects
the isothermal fatigue properties of bulk solder, because thermal fatigue crack initiates at the surface of solder fillet
and propagates within the fillet in an early stage of fatigue damage. Furthermore, the lead phases lying at the interface
between lead-frame and bismuth containing solder joint may promote the crack propagation at the interface, resulting in the
extremely low thermal fatigue resistance of the joint. 相似文献
10.
Mori H Kanemura Y Onaya J Hara M Miyake J Yamasaki M Kariya Y 《Journal of Bioscience and Bioengineering》2005,100(1):54-61
Heparin binds various growth factors and activates them to interact with high-affinity cell surface receptors; a specific array of sulfate groups in the heparin backbone structure is very important for this interaction. In the present study, we evaluated the effects of two novel heparin derivatives, 6-O-desulfated heparin (6-DSH) and 2-O-desulfated heparin (2-DSH), on blood coagulation and the proliferation of human neural stem/progenitor cells (NSPCs). 6-DSH showed lower anticoagulant activity than intact heparin or 2-DSH, as measured by the activated partial thromboplastin time and thrombin time. In the presence of FGF-2, 6-DSH and 2-DSH promoted approximately the same rate of proliferation of human NSPCs, without noticeably changing the expression of nestin. The mitotic effects of 6-DSH and 2-DSH on human NSPCs were different from their effects on mouse hematopoietic stem cells and fibroblasts. These findings indicate that 6-DSH and 2-DSH have the same ability to promote the growth of human NSPCs as intact heparin. Our results suggest that these two novel heparin derivates, especially 6-DSH, could be used in clinical applications for ex vivo human NSPC culture, as a lower-risk growth co-adjuvant than intact heparin. 相似文献