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11.
Characterization of the chemical conversion films that form on Mg−Al alloy in colloidal silica solution 总被引:1,自引:0,他引:1
Seong?-Jong?KimEmail author Ying?Zhou Ryoichi?Ichino Masazumi?Okido Shoji?Tanikawa 《Metals and Materials International》2003,9(2):207-213
Chemical conversion treatment of Mg−Al alloy (AZ91) using colloidal silica as an alternative to chromate conversion was investigated
as a function of solution pH, temperature, solution conditions, and treatment time. The solution used for the colloidal silica
coating consisted of colloidal silica, titanium sulfate, and cobalt ions to maintain good anti-corrosion and adhesion properties.
Adding CoSO4 to the colloidal silica solution enhanced the adhesion force between the silica film and magnesium substrate. The optimum
conditions for the chemical conversion treatment solution were pH 2, 90-sec treatment, and 25°C. 相似文献
12.
This paper presents a numerical study of the transmission of a 160-Gb/s return-to-zero pulse train in a fiber link, in which both the dispersion and the dispersion-slope are periodically compensated. Two types of slope-compensation are considered: one is lumped compensation at each repeater, and the other is distributed compensation that uses a slope-reversed negative dispersion fiber. It is predicted that distributed slope compensation will provide better performance than lumped slope compensation at each amplifying repeater. This tendency will hold irrespective of the strength of dispersion-management, though the strong dispersion-management will shorten the available transmission distance. 相似文献
13.
The increasingly severe demands of concurrently increasing die size while reducing the package size have made the mechanical stability of IC packaging technologies a grave concern. The dominant failure is caused at the interface between dissimilar materials. To investigate the effect of polyimide surface morphology and chemistry on the epoxy molding compound adhesion, the polyimide samples were characterized by X-ray photoemission spectroscopy, atomic force microscopy, attenuated total reflection and interfacial adhesion tests. The results of the characterization and an explanation of the primary factors affecting interfacial adhesion are presented in this paper. 相似文献
14.
Masazumi Godo Masatsune Umemura Atsushi Ishihara Toshiaki Kabe 《American Institute of Chemical Engineers》1997,43(11):3105-3110
To determine the behavior of hydrogen in tetralin, the reaction of tetralin with tritiated gaseous hydrogen was studied in a flow reactor at 400–450°C, 2.5–9.8 MPa for various residence times. The amount of hydrogen exchange between tetralin and tritiated hydrogen was estimated from the balance of hydrogen and tritium. Although yields of methylindan and naphthalene, and the hydrogen-exchange ratio (HER) of tetralin increased monotonously with residence time, these values were scarcely influenced by the reaction pressure at every temperature. It was thought that the formation of tetralyl radicals in this system would be the rate-determining step for both the conversions of tetralin into methylindan and naphthalene, and the hydrogen exchange of tetralin. Conversions of tetralin into methylindan and naphthalene, and the hydrogen-exchange reaction using the autoclave were very close to those using the flow reactor. 相似文献
15.
The electrochemical reduction of zirconium and hafnium in alkali chloride or fluoride-chloride molten salts on platinum electrodes has been investigated by means of linear and cyclic voltammetry. It has been found that fluoride ions greatly influenced the reduction of zirconium and hafnium in fluoride-chloride melts. It has been proposed that the mechanism for reduction of zirconium and hafnium in baths containing a low concentration of fluoride compounds is different from the mechanism in baths containing a higher fluoride concentration. 相似文献
16.
Fukuchi Y. Sakamoto T. Taira K. Kikuchi K. Kunimatsu D. Suzuki A. Ito H. 《Photonics Technology Letters, IEEE》2002,14(9):1267-1269
In all-optical gate switches that employ the cascaded second-order nonlinear effect in quasi-phase-matched (QPM) LiNbO/sub 3/ devices, walkoff between the fundamental and second harmonic pulses is very large. The authors experimentally show that crosstalk of the switch induced by such walkoff limits the switching speed, but that the switching speed can significantly be enhanced by walkoff compensation. Using a 20-mm-long QPM LiNbO/sub 3/ waveguide device, the authors switch one of twin pulses separated by 6.25 ps without crosstalk, showing the possibility of switching a 160-Gb/s signal. 相似文献
17.
Tetsuo Fukuchi Takayuki Ozeki Mitsutoshi Okada Tomoharu Fujii 《IEEJ Transactions on Electrical and Electronic Engineering》2016,11(4):391-400
A thermal barrier coating (TBC) is applied to high‐temperature components in gas turbines, and consists of a ceramic topcoat and a metallic bondcoat. Various kinds of TBC degradation and damage occur in high‐temperature components during service, such as topcoat thinning, topcoat delamination, and formation of a thermally grown oxide (TGO) layer below the topcoat, each of which can be examined using a suitable nondestructive inspection technique. Topcoat thinning can be detected by topcoat thickness measurement using terahertz waves, which are electromagnetic waves in the frequency region between optical and radio waves. The measurement resolution is about 10 μm, which is comparable to microscopic observation of the cross section in destructive inspection. Topcoat delamination can be detected by active thermography, in which the topcoat surface is scanned by a heating laser and the surface temperature distribution is measured by a thermal infrared camera. The combination of temperature peak and residual thermal image detection is effective in eliminating false detection. The TGO layer can be detected using photoluminescence, in which the Cr3+ ions included as an impurity in Al2O3 are detected. Since delamination tends to occur at locations at which the TGO layer has grown, TGO layer detection provides an effective method to select regions where delamination has occurred or is likely to occur. An inspection flow based on these techniques is proposed, which is expected to aid the establishment of condition‐based maintenance strategies of high‐temperature components. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
18.
DISSOLUTION THEORY OF GOLD IN ALKALINE THIOUREA SOLUTION(Ⅰ) Anodic Behavior on Gold in Alkaline Thiourea Solution Containing Na_2SO_3 总被引:2,自引:0,他引:2
Chai Liyuan Masazumi Okido Department of Nonferrous Metallurgy Central South University of Technology Changsha P. R.China Center for Integrated Research in Science Engineering Nagoya University Nagoya Japan 《中国有色金属学会会刊》1999,(1)
INTRODUCTIONSincethioureawasutilizedasthelixiviantofgoldearlyin1932[1],extractinggoldfromoreorscrapbyacidicthioureasolutionha... 相似文献
19.
S Teramoto T Matsuse E Ohga H Katayama Y Fukuchi Y Ouchi 《Canadian Metallurgical Quarterly》1997,35(12):1312-1317
We tested the effects of a DNA topoisomerase inhibitor (camptothecin; CPT) on the transduction efficiency of AAV vectors in cultured human airway epithelial cells. The cells were treated with CPT for 24 hours, then exposed to AAV-CMV-LacZ for 1 hour at different multiplicities of infection (moi). Transduction efficiency of AAV vectors was assessed using X-gal staining as the percentage of LacZ-expressing cells. The transduction efficiency was approximately 1.5 to 10 fold increased by treatment with CPT prior to AAV vector exposure. However, treatment with CPT after AAV vector infection did not enhance the transduction efficiency of the vectors. These results suggest that pre-treatment with CPT increases the transduction efficiency of AAV vectors, probably by nodulating cellular function. 相似文献
20.