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51.
Micro-scale textures may be engineered into surfaces for lubrication performance improvement. It is expected that a carefully
chosen texture helps retain lubricant and enhances the hydrodynamic effect at the interface. The concept of model-based virtual
texturing enables textured surfaces to be generated and “tested” through numerical simulations. This paper reports virtual
texturing and simulation of a group of textured surfaces in a lubricated concentrated contact. The focus of the study is on
the selection of texture distribution patterns based on their lubrication performance. Patterns of fishbone, sinusoidal, triangular,
and honeycomb distributions have been investigated. The effects of texture direction, orientation angle, feature continuity,
and aspect ratio are also studied. The results indicate that, for the given material and geometry system under the given conditions
in the present work, the textures generating the strongest hydrodynamic lifting are short grooves with a small aspect ratio
and sinusoidal waves of a small wavelength/amplitude ratio propagating in the motion direction. 相似文献
52.
Toshikazu Fujino Katsumi Iwamoto Kentaro Tanaka Masayuki Shima 《Tribology International》2007,40(10-12):1638
In recent years, the techniques improving sliding performances have progressed by using coated films possessing superior tribological properties, to reduce the failures of the mechanical elements. Those techniques are often used under severe conditions such as elastohydrodynamic lubrication (EHL). In this paper, numerical three-dimensional analysis of the maximum shear stress applied into the coated film and substrate under a single EHL operating condition was performed with a range of coated film thickness and elastic properties. The strength of coated film as one of those techniques was evaluated numerically, resulting in an optimum design of coated film. As a result, coated films with a larger value of thickness and a smaller modulus of elasticity than that of substrate are preferable. 相似文献
53.
Jing C. Zhou Xianghuai Wang Mei Xue Zheng Xu Toshikazu Hamasaki Yang Yang Kang Wang Bruce Dunn 《Materials science & engineering. C, Materials for biological applications》2010,30(1):20-26
Microtubule (MT) protein filaments were used as templates for fabricating Au nanowires as a bottom-up approach for fabricating building blocks for future integrated circuits. Photochemical reduction methods were employed to form Au nanoparticles which bind and uniformly cover the MT filaments. Synthesis of the MT-templated Au nanowires was characterized using UV/vis spectroscopy and transmission electron microscopy (TEM). In addition, binding between the MT filaments and Au nanoparticles was investigated using surface enhanced Raman spectroscopy (SERS) and X-ray photoelectron spectroscopy (XPS) to establish the nature of the binding sites. A variety of functional groups were identified by SERS to interact with the Au including imidazole, sulfur, aromatic rings, amine, and carboxylate. The imidazole ring in the histidine is the most prominent functional group for Au binding. The results from these studies provide better understanding of the binding between Au and the biotemplate and give insight concerning methods to improve Au coverage for MT-templated Au nanowires. 相似文献
54.
55.
Thermoplastics such as cyclic olefin copolymer (COC) and polymethylmethacrylate (PMMA) have been increasingly used in fabricating microfluidic devices. However, the state-of-the-art microvalve technology is a polydimethylsiloxane (PDMS)-based three-layer structure. In order to integrate such a valve with a thermoplastics-based microfluidic device, a bonding method for thermoplastics/PDMS must be developed. We report here a method to bond COC with PDMS through surface activation by corona discharge, surface modification using 3-(trimethoxysilyl)propyl methacrylate (TMSPMA), and thermal annealing. The method is also applicable to PMMA. The bonding strength between thermoplastics and PDMS was represented by the peeling force, which was measured using a method established by the International Organization for Standardization (ISO). The bonding strength measurement offered an objective and quantitative indicator for protocol optimization, as well as comparison with other PDMS-associated bonding methods. Using optimized bonding conditions, two valve arrays were fabricated in a COC/PDMS/COC device and cyclic operations of valve closing/opening were successfully demonstrated. The valve-containing devices withstood 100 psi (~689 KPa) without delamination. Further, we integrated such valve arrays in a device for protein separation and demonstrated isoelectric focusing in the presence of valves. 相似文献
56.
Takayuki Tomaru Shinji Miyoki Masatake Ohashi Kazuaki Kuroda Takashi Uchiyama Toshikazu Suzuki Akira Yamamoto Takakazu Shintomi Akitoshi Ueda Daisuke Tatsumi Shuichi Sato Koji Arai Masaki Ando Koji Watanabe Kenji Nakamura Masahiko Watanabe Kazuhiko Ito Izumi Kataoka Hiroaki Yamamoto Brett Bochner Yaron Hefetz 《Applied optics》2003,42(7):1306-1307
57.
We report on measurements of the tunneling conductance structures above the superconducting gap energy using YBa2Cu3O7 polycrystalline junctions. The measured second derivative data are reproducible among the junctions, and the intensities of the common structures at the biases of 37–38, 47–53, 67–77, and 94–95 mV are strong enough to be assigned. These structures are in agreement with those in the neutron phonon density of states in whole energy regions when the energies are measured from the gap edge of 26±1 meV. This correspondence indicates that the electron-phonon interaction contributes to the pairing mechanism of this superconductor. 相似文献
58.
Toshikazu Akahori Mitsuo Niinomi Akihiro Suzuki 《Metallurgical and Materials Transactions A》2002,33(3):503-510
Hydrogenation and dehydrogenation, that is, thermochemical processing (THP) and its variation with a post-heat treatment (THPH),
are investigated in order to improve the balance of strength, elongation, and fatigue strength of cast Ti-6Al-7Nb and Ti-6Al-4V
for dental applications. Microstructures of both cast alloys change from coarse Widmanst?tten α structure to super fine α structure with an average diameter of 3 μm by conducting THP or THPH. Tensile strength and fatigue limit of cast Ti-6Al-7Nb and Ti-6Al-4V increase by around 10 and
40 pct, respectively, as compared with those of both as-cast alloys. The balance of strength and ductility of cast Ti-6Al-7Nb
is improved by conducting THPH as compared with the case where THP is conducted. This improvement is due to the plastic deformability
of unstable β phase because the lattice constant of β phase in each alloy conducted with THPH is much greater than that of each as-cast alloy. 相似文献
59.
F Tanaka T Fujie K Tahara M Mori K Takesako A Sette E Celis T Akiyoshi 《Canadian Metallurgical Quarterly》1997,57(20):4465-4468
For the development of immunotherapy using MAGE peptides, the identification of additional tumor antigens is required. Because HLA-A24 is the most common allele in Japanese and is also frequently present in Caucasians, MAGE-3-encoded synthetic peptides with binding affinity for HLA-A24 were thus tested for the induction of specific CTLs from the peripheral blood mononuclear cells (PBMCs) of HLA-A24 healthy donors using a simplified method. By using a peptide with a sequence of IMPKAGLLI (amino acid position in MAGE-3 195-203), the CTL responses could thus be induced from unseparated PBMCs by stimulation with freshly isolated, peptide-pulsed PBMCs as antigen-presenting cells (APCs) and by also using interleukin 7 and keyhole limpet hemocyanin for a primary culture. The induced CTLs could lyse HLA-A24 carcinoma cells expressing MAGE-3, as well as the peptide-pulsed target cells, in an HLA class-I restricted manner. The identification of the MAGE-3/HLA-A24 peptide, IMPKAGLLI, may thus potentially offer the opportunities to design peptide-based immunotherapeutic approaches that might prove to be effective in treating patients with MAGE-3-positive malignant tumors. 相似文献
60.
Shin’ichi Konno Shigeo Kazama Maki Hiraoka Hirokazu Sakamoto Kenji Mizoguchi Hiromi Taniguchi Toshikazu Nakamura Kou Furukawa 《Journal of Low Temperature Physics》2006,142(3-4):621-624
β′-(BEDT-TTF)(TCNQ) is a compound of BEDT-TTF (=ET) and TCNQ molecules aligned orthogonally with each other, forming two-dimensional
sheets and one-dimensional columns of 1/4-filled π band, respectively. It is known that the metal-insulator transition occurs
at 330 K at ambient pressure. We have measured the electronic spin susceptibility by means of the EPR-NMR method at 50 MHz,
and the angular dependence of g-factor and line width of EPR both at Q (34 GHz) and W (94 GHz) band. We successfully confirmed
that the antiferromagnetic transition occurs in ET sheets and TCNQ columns, independently. 相似文献