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71.
T. Kasemura Y. Oshibe H. Uozumi S. Kawai Y. Yamada H. Ohmura T. Yamamoto 《应用聚合物科学杂志》1993,47(12):2207-2216
To improve oil and water repellency, fluorine-containing block copolymers, which were composed of methyl methacrylate (MMA), glycidyl methacrylate (GMA), and 1H, 1H, 2H, 2H-heptadecafluorodecyl acrylate (PFA), were blended with an epoxy resin. It was expected that a glycidyl group would mesh with the epoxy resin by primary bonding, and the low surface energy fluorocarbon segment would absorb and orient to the exterior to fluorinate the surface. X-ray photoelectron spectroscopy, contact angle, and peel strength of pressure-sensitive adhesives for modified epoxy resin surface were determined. The amount of fluorine obtained via angular-dependent ESCA investigation in the modified resin surfaces increased with the shallowing of the sampling depth. With increasing modifier content, the amount of fluorine in the modified resin surface layer increased, and the critical surface tension of modified resin surfaces and the peel strength of a silicone pressuresensitive adhesive affixed to the modified epoxy resin, decreased. A considerable amount of fluorine in the resin surface modified with GMA-containing block copolymers remained after Soxhlet extraction, whereas in the surface modified with copolymer without GMA, more fluorine was extracted. It was extracted. It was shown that these copolymers were good surface modifiers to improve oil and water repellency. © 1993 John Wiley & Sons, Inc. 相似文献
72.
J. Shimizu E. Ohmura Y. Kobayashi S. Kiyoshima H. Eda 《Journal of Thermal Spray Technology》2007,16(5-6):722-728
Three-dimensional molecular dynamics simulation was conducted to clarify at an atomic level the flattening process of a high-temperature
droplet impacting a substrate at high speed. The droplet and the substrate were assumed to consist of pure aluminum, and the
Morse potential was postulated between a pair of aluminum atoms. In this report, the influence of the impact parameters such
as the droplet velocity and the droplet diameter on flattening behavior were analyzed. As a result, the following representative
conclusions were obtained: (a) the flattening ratio increases in proportion to the droplet velocity and the droplet diameter;
(b) the flattening ratio for nanosized droplet can be reorganized by the same dimensionless parameters of the proper physical
properties, such as the viscosity and the surface tension, as those used in the macroscopic flattening process.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
73.
Tatsuya Arai Akari Yamauchi Ai Miura Hidemasa Kondo Yoshiyuki Nishimiya Yuji C. Sasaki Sakae Tsuda 《International journal of molecular sciences》2021,22(7)
Beetle hyperactive antifreeze protein (AFP) has a unique ability to maintain a supercooling state of its body fluids, however, less is known about its origination. Here, we found that a popular stag beetle Dorcus hopei binodulosus (Dhb) synthesizes at least 6 isoforms of hyperactive AFP (DhbAFP). Cold-acclimated Dhb larvae tolerated −5 °C chilled storage for 24 h and fully recovered after warming, suggesting that DhbAFP facilitates overwintering of this beetle. A DhbAFP isoform (~10 kDa) appeared to consist of 6−8 tandem repeats of a 12-residue consensus sequence (TCTxSxNCxxAx), which exhibited 3 °C of high freezing point depression and the ability of binding to an entire surface of a single ice crystal. Significantly, these properties as well as DNA sequences including the untranslated region, signal peptide region, and an AFP-encoding region of Dhb are highly similar to those identified for a known hyperactive AFP (TmAFP) from the beetle Tenebrio molitor (Tm). Progenitor of Dhb and Tm was branched off approximately 300 million years ago, so no known evolution mechanism hardly explains the retainment of the DNA sequence for such a long divergence period. Existence of unrevealed gene transfer mechanism will be hypothesized between these two phylogenetically distant beetles to acquire this type of hyperactive AFP. 相似文献
74.
Pagan Michael Ohmura Takahito Wang Ling Zinkle Steven Babu S. S. 《Metallurgical and Materials Transactions A》2022,53(10):3547-3564
Metallurgical and Materials Transactions A - Ultrasonic additive manufacturing (UAM) technology can produce structural materials with complex geometries and embedded sensors. Under UAM-processing... 相似文献
75.
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77.
Tomomi Hatsugai Ryutaro Nakayama Shigeo Tomura Ryo Akiyoshi Shirou Nishitsuka Ryo Nakamura Satoshi Takeya Ryo Ohmura 《化学工程与技术》2020,43(11):2307-2314
Ozone (O3) has many industrial applications such as in sterilization. One of the long-term O3 preservation methods is molecular storage in clathrate hydrate. In this study, an experimental system was developed for continuously forming O3 + O2 + CO2 hydrates. The parameters that affect the continuous operation of the system and that lead to increases in the concentration of O3 in the hydrates were also experimentally evaluated, implementing the method of quality engineering. After optimizing these operating parameters, the O3 storage capacity in the hydrates was measured to be 0.26 wt % at 2 h of total operation time. By X-ray diffraction, it was found that the produced sample contained hydrates, and long-term preservation for 6 months was possible at the temperature of general freezing warehouses. 相似文献
78.
79.
Tohru Suzuki Kenji Kamiyama Hidemasa Yamano Shigenobu Kubo Yoshiharu Tobita Ryodai Nakai 《Journal of Nuclear Science and Technology》2013,50(4):493-513
As the most promising concept of sodium-cooled fast reactors, the Japan Atomic Energy Agency (JAEA) has selected the advanced loop-type fast reactor, so-called JSFR. The safety design requirements of JSFR for Design Extension Condition (DEC) are the prevention of severe accidents and the mitigation of severe-accident consequences. For the mitigation of severe-accident consequences, in particular, the In-Vessel Retention (IVR) against postulated Core Disruptive Accidents (CDAs) is required. In order to investigate the sufficiency of these safety requirements, a CDA scenario should be constructed, in which the elimination of power excursion and the in-vessel cooling of degraded core materials are evaluated so as to achieve IVR. In the present study, the factors leading to IVR failure were identified by creating phenomenological diagrams, and the effectiveness of design measures against them were evaluated based on experimental data and computer simulations. This is an unprecedented approach to the construction of a CDA scenario, and is an effective method to objectively investigate the factors leading to IVR failure and the design measures against them. It was concluded that mechanical/thermal failures of the reactor vessel due to power-excursion/thermal-load could be avoided by adequate design measures, and a clear vision for achieving IVR was obtained. 相似文献
80.
Hidemasa Takana Yoshihiro Okuno Hiroyuki Yamasaki 《Electrical Engineering in Japan》2007,158(1):46-52
Transient responses of a closed‐loop MHD experimental facility from nonpower generation to power generation have been investigated by means of time‐dependent quasi‐one‐dimensional numerical simulations. For the long‐time continuous power generation experiment, the time required to obtain the steady state for the power generation is estimated to be approximately 20 hours. By increasing the electrical input power to the heater as an exponential function of time, the temperature increment of ceramics can be moderated. When the duration of the experiment is around 10 minutes, argon gas temperature at the exit of the heater hardly changes because of the large heat capacity of structure materials. It is found that the fluid disturbances are induced at the instant of the power generation and they propagate as they repeatedly reflect at the sudden change of duct shape. Since all of the induced disturbances attenuate approximately 0.4 second after the power generation, the time scale that the disturbances exist in the facility is estimated to be 1 second at most. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(1): 46–52, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20237 相似文献