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On 6-Dimensional Nearly Kähler Manifolds
Watanabe, Yoshiyuki,Suh, Young Jin Canadian Mathematical Society 2010 Canadian mathematical bulletin Vol.53 No.3
<B>Abstract</B><P>In this paper we give a sufficient condition for a complete, simply connected, and strict nearly Kähler manifold of dimension 6 to be a homogeneous nearly Kähler manifold. This result was announced in a previous paper by the first author.</P>
Surface modification of resin substrate by UV treatment for printed circuit board
Kunihito BABA,Yoshiyuki NISHIMURA,Mitsuhiro WATANABE,Hideo HONMA 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
In recent years, with the miniaturization of electric devices, the demand for flexible printed circuits (FPC) using polyimide has increased, because of its excellent heat resistance and size stability. Polyimide also has good flexibility and surface smoothness. However, polyimide has a tendency of having high moisture absorption as well as high gas permeability. On the other hand, Cyclo Olefin Polymer (COP) has low moisture absorption, excellent size stability and excellent high frequency electrical properties. Therefore, the COP is attractive as a substrate of FPC. However, it is difficult to form metal film using electroless plating on the COP by conventional processes. We confirmed that a copper film can be formed with high adhesion strength while maintaining a smooth resin surface using surface modification by the UV irradiation. Surface modification by UV irradiation was effective to achieve good adhesion (about 1.0 kN/m) between the COP resin and the deposited metal without roughing the COP surface. An interface electric conductivity of the printed circuit on COP produce by this method indicated a value of 80% approximately until 30 ㎓ area.
Amphiphilic graft copolymers: Effect of graft chain length and content on colloid gel
Nitta, Kyohei,Kimoto, Atsushi,Watanabe, Junji,Ikeda, Yoshiyuki Techno-Press 2015 Biomaterials and biomedical engineering Vol.2 No.2
A series of amphiphilic graft copolymers were synthesized by varying the number of graft chains and graft chain lengths. The polarity of the hydrophobic graft chain on the copolymers was varied their solution properties. The glass transition temperature of the copolymers was in the low-temperature region, because of the amorphous nature of poly (trimethylene carbonate) (PTMC). The surface morphology of the lyophilized colloid gel had a bundle structure, which was derived from the combination of poly(N-hydroxyethylacrylamide)( poly(HEAA)) and PTMC. The solution properties were evaluated using dynamic light scattering and fluorescence measurements. The particle size of the graft copolymers was about 30-300 nm. The graft copolymers with a higher number of repeating units attributed to the TMC (trimethylene carbonate) component and with a lower macromonomer ratio showed high thermal stability. The critical association concentration was estimated to be between $2.2{\times}10^{-3}$ and $8.9{\times}10^{-2}mg/mL$, using the pyrene-based fluorescence probe technique. These results showed that the hydrophobic chain of the graft copolymer having a long PTMC segment had a low polarity, dependent on the number of repeating units of TMC and the macromonomer composition ratio. These results demonstrated that a higher number of repeating units of TMC, with a lower macromonomer composition, was preferable for molecular encapsulation.