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Sakai, Japan

Iida M.,Denso Corporation | Maeno T.,Qualtec Co. | Wang J.,Nagoya Institute of Technology | Fujiwara O.,Nagoya Institute of Technology
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) | Year: 2016

SUMMARY Electromagnetic disturbances in vehicle-mounted FM radios are mainly caused by conducted noise currents flowing through wiring harnesses from printed circuit boards (PCBs) with the slits of ground patterns. To suppress these noise currents from PCBs, we previously performed Finite-Difference Time-Domain (FDTD) simulation and measurement using multiple simple two-layer PCB models in which the ground patterns were divided into two parts with different widths, and revealed that both results agreed well with the fact that crosstalk cannot always be reduced by increasing the width of divided ground patters, but had the smallest values (dipping point) at a specific spacing between the divided ground patterns. In order to clarify the above result, we calculated crosstalk using a formula developed from a simplified equivalent circuit model consisting of inductances, derived from their geometrical mean distances (GMDs) from the traces and ground patterns, and found that the calculation results also had dipping point. However, the specific spacing and crosstalk values were different from the simulations and measurements. In the present study, to improve calculation accuracy, we considered nonuniformity of the current distribution in the ground patterns instead of a uniform current distribution, and obtained crosstalk evaluation results which agreed better with simulations and measurements. © 2015 Wiley Periodicals, Inc.

Zhang Q.,Changzhou University | Wang Y.,Changzhou University | Wang W.,Changzhou University | Mitsuzak N.,Qualtec Co. | Chen Z.,Changzhou University
Electrochemistry Communications | Year: 2016

Diamond-like carbon (DLC) films are prepared by electrodeposition technique on SnO2-coated glass substrates in chloroacetic acid aqueous solution. The applied voltage between the electrodes is mere 3.0 V for 2 h. The films composed of small and compact grains that show two distinct Raman characteristic peaks at ~ 1340 and ~ 1580 cm- 1. With the method reported in this paper, the DLC films are firstly fabricated the DLC films at both low voltage and ambient temperature. © 2015 Elsevier B.V.All rights reserved.

Wang Y.,Changzhou University | He J.,Changzhou University | Wang W.,Changzhou University | Shi J.,Changzhou University | And 2 more authors.
Applied Surface Science | Year: 2014

The preparation of Ni-P/Ni3.1B composite alloy coating on the surface of copper was achieved by co-deposition of Ni3.1B nanoparticles with Ni-P coating during electroless plating. Ni-P-B alloy coating was obtained by heat-treating the as-plated Ni-P/Ni3.1B composite coating. The effect of the concentration of sodium alginate, borax, thiourea, Ni3.1B, temperature, and pH value on the deposition rate and B content were investigated and determined to be: 30 g L-1, 10 g L -1, 2 mg L-1, 20 mg L-1, 70 C and 9.0, respectively. Sodium alginate and thiourea were played as surfactant for coating Ni3.1B nanoparticles and stabilizer for the plating bath, respectively. Ni-P/Ni3.1B composite coating had good performance such as corrosion resistance and solderability. © 2013 Elsevier B.V.

Wang Y.,Changzhou University | Cao X.,Changzhou University | Wang W.,Changzhou University | Mitsuzak N.,Qualtec Co. | Chen Z.,Changzhou University
Surface and Coatings Technology | Year: 2015

A simple, green, stable, and acidic solution was developed based on choline chloride (ChCl) and chloroauric acid (HAuCl4) for immersion gold deposition onto electroless nickel substrate by galvanic displacement process. The relationships between gold (Au) deposition rate and solution parameters were investigated. The optimal conditions were determined as 1.0g·L-1 HAuCl4, 500g·L-1 ChCl, 80°C, pH0.5~2.5. The kinetics equation of IG deposition process was deduced and the corresponding activation energy was calculated to be 28.03kJ·mol-1. At the same time, the performances of the coatings were investigated. The results revealed that Au coatings prepared from chloroauric acid-choline chloride (Au(III)-ChCl) solution had excellent properties on solderability and corrosion resistance. © 2015 Elsevier B.V.

Shimizu M.,Kyoto University | Sakakura M.,Kyoto University | Ohnishi M.,Qualtec Co. | Shimotsuma Y.,Kyoto University | And 3 more authors.
Journal of Applied Physics | Year: 2010

Accumulation of thermal energies by highly repeated irradiation of femtosecond laser pulses inside a glass induces the heat-modification whose volume is much larger than that of the photoexcited region. It has been proposed that the heat-modification occurs in the region in which the temperature had overcome a threshold temperature during exposure of laser pulses. In order to understand the mechanism of the heat-modification, we investigated the temperature distribution during laser exposure and the threshold temperature by analyzing the volume of the modification based on a thermal diffusion model. We found that the threshold temperature becomes lower with increasing laser exposure time. The dependence of the threshold temperature on the laser exposure time was explained by the deformation mechanism based on the temperature-dependent viscosity and viscoelastic behavior of a glass under a stress loading by thermal expansion. The deformation mechanism also could simulate a tear-drop shape of a heat-modification by simultaneous double-beams' irradiation and the distribution of birefringence in a heat-modification. The mechanism proposed in this study means that the temperature-dependence of the viscosity of a glass should be essential for predicting and controlling the heat-modification. © 2010 American Institute of Physics.

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