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排序方式: 共有186条查询结果,搜索用时 31 毫秒
91.
K. NiitsuT. Omori M. NagasakoK. Oikawa R. KainumaK. Ishida 《Journal of Alloys and Compounds》2011,509(6):2697-2702
Phase transformations in the β (B2) phase of Co-21 and -23 at.% Al alloys were examined using transmission electron microscopy, energy dispersive X-ray spectroscopy and differential scanning calorimetry. The microstructures obtained from as-quenched specimens were found to be strongly affected by the quenching condition. While relatively thick sheet-specimens with a lower quenching rate showed bainitic plate precipitates with a fcc structure, a martensite-like structure was observed by optical microscopy in relatively thin specimens with a higher quenching rate. Regardless of the quenching condition, a spinodal-like microstructure composed of A2 and B2 phases was also detected and the A2 phase changed to a metastable hcp phase during further aging. 相似文献
92.
Tomoya Komatsu Yasutomo Tanaka Ken-ya Hashimoto Tatsuya Omori Masatsune Yamaguchi 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2009,56(7):1451-1456
This paper proposes a new design technique for a ladder-type filter to reduce the passband width without sacrificing the insertion loss, out-of-band rejection, and steepness of the transition bands. First, it is shown that 2 transmission zeros can be generated by connecting an additional resonator in either series or parallel arm of the ladder filter topology. This new filter topology can be designed systematically by the derived-m transformation. Second, it is demonstrated that the narrow bandwidth, sharp transition bands, and large outof- band rejection are simultaneously realized by applying the present technique to specifically designed ladder-type filters. Finally, this technique is applied to the design of a SAW filter fabricated on the Cu-grating/15°YX-LiNbO3 structure. 相似文献
93.
Yiliu Wang Hashimoto K.-y. Omori T. Yamaguchi M. 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2009,56(4):806-811
This paper describes full-wave analysis of piezoelectric boundary acoustic waves (PBAWs) propagating along a metallic grating sandwiched between 2 semi-infinite layers. In the analysis, the finite element method (FEM) is used for the grating region while the spectral domain analysis (SDA) is applied for an isotropic overlay region as well as a piezoelectric substrate region. The combination of the FEM and SDA makes the numerical analysis very fast and precise. As an example, the analysis was made on the PBAWs propagating in an SiO2 overlay/ Cu grating/rotated Y-cut LiNbO3 structure. It is shown that both the shear-horizontal (SH) type and Rayleigh-type PBAWs are supported in the structure, and that their velocities are very close to each other. Thus spurious responses due to the Rayleigh-type PBAW should completely be suppressed for device implementation. Discussions are made in detail on the influence of Cu grating thickness, substrate rotation angle, and metallization ratio on excitation and propagation characteristics of the SH- and Rayleigh-type PBAWs. 相似文献
94.
Hashimoto K.-Y. Omori T. Yamaguchi M. 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2009,56(11):2559-2564
This paper describes the characterization of SAW propagation in layered substrate and overlayered structures. The software based on the finite element method and spectral domain analysis was newly developed and applied to the characterization of SAW propagation under an infinitely-long Al interdigital transducer on a rotated Y-cut LiTaO3/sapphire substrate. Because of the finite LiTaO3 thickness, a series of spurious resonances appears. It is shown that the excitation strength of the spurious resonances changes with frequency as well as the rotation angle, which reflects the frequency and rotation angle dependence of the energy leakage. Next, the analysis was carried out for SAWs propagating in a SiO2 layer/Al IDT/42°YX-LiTaO3 structure. It is shown that the influence of the SiO2 layer is significantly dependent on the location where the SiO2 layer is deposited. In particular, it is shown that when the SiO2 layer is deposited only on top of the electrodes, the SAW reflectivity increases compared with when the SiO2 layer is deposited between and on top of electrodes. 相似文献
95.
Tobit models are extended to allow threshold values which depend on individuals’ characteristics. In such models, the parameters are subject to as many inequality constraints as the number of observations, and the maximum likelihood estimation which requires the numerical maximisation of the likelihood is often difficult to be implemented. Using a Bayesian approach, a Gibbs sampler algorithm is proposed and, further, the convergence to the posterior distribution is accelerated by introducing an additional scale transformation step. The procedure is illustrated using the simulated data, wage data and prime rate changes’ data. 相似文献
96.
A. Iwami B. G. Osborne H.‐N. Huynh R. S. Anderssen I. J. Wesley Y. Kajiwara H. Takashita T. Omori 《Journal of the Institute of Brewing》2005,111(2):181-189
The selection of grain that is optimum for barley Shochu is not straightforward. Usually malting barley is used, but not all malting barley samples perform well in Shochu production. In addition there is a genotype × environment effect, so that a given variety may perform satisfactorily in one environment but not another. Therefore a method for testing samples for Shochu is required. This group has previously reported on the evaluation of barley for Shochu production using the Single Kernel Characterization System (SKCS) and demonstrated a significant correlation between the SKCS Hardness Index and pearling performance. The Hardness Index values are multivariate statistical predictions derived from an incremental change analysis of the crush‐response profiles. In the present study, a detailed analysis was performed of the averaged SKCS Crush‐Response Profiles of barley, obtained when measuring the SKCS Hardness Index. It was concluded that the morphological differences between averaged barley SKCS Crush‐Response Profiles appear to allow barley varieties to be classified into four distinct classes. In addition, the elastic response to the crushing on the SKCS device of the aleurone layers of barley kernels yields a useful predictor of pearling quality/performance. 相似文献
97.
Motoyuki Iijima Sayaka Omori Keisuke Hirano Hidehiro Kamiya 《Advanced Powder Technology》2013,24(3):625-631
A free-standing, roll-able, and transparent silicone-based polymer film with a tensile modulus of ca. 7.8 MPa and strain at the break point of 0.76% was successfully prepared by reaction between a reactive silicone oligomer with methyl- and methoxy-side groups and hydrophilic SiO2 nanoparticles. First, SiO2 nanoparticles were grafted with silicone chains by a controlled wet chemical sol–gel-type reaction with the reactive oligomers. The solvent of the resulting solution was evaporated to form a viscous suspension, casted into a film, and finally heat-treated at 100 °C and 150 °C. A hydrolysis and condensation reaction among silicone-grafted SiO2 nanoparticles and free silicone oligomers in the final heat treatment resulted to produce free-standing, roll-able, and transparent silicone-based polymer film. The fact that the silicone film cannot be synthesized without the presence of SiO2 nanoparticles suggests that these nanoparticles act as cross-linking agents of silicone components providing the improved mechanical properties to the composite film. The rate-controlled mixing and heating of the SiO2 aqueous/alcohol suspension and the silicone oligomer/alcohol solution was found to be the key step in the synthesis of the free-standing transparent film. While rapid addition/mixing resulted in a fragile and opaque film, a transparent material was achieved when those solutions were slowly mixed. The effect of the synthesis process on the macroscopic and microscopic properties of the prepared films is discussed along with their formation mechanism. 相似文献
98.
Komei Kato Akiko Yamamoto Shojiro Ochiai Masahiro Wada Yuzo Daigo Koichi Kita Kenichi Omori 《Materials science & engineering. C, Materials for biological applications》2013,33(5):2736-2743
Novel 316 L stainless steel (SS) foam with 85% porosity and an open pore diameter of 70–440 μm was developed for hard tissue application. The foam sheet with a 200-μm diameter had superior cell proliferation and penetration as identified through in vitro experiments. Calcification of human osteosarcoma cells in the SS foam was observed. Multi-layered foam preparation is a potential alternative technique that satisfies multi-functional requirements such as cell penetration and binding strength to the solid metal. In tensile tests, Young's modulus and the strength of the SS foam were 4.0 GPa and 11.2 MPa respectively, which is comparable with human cancellous bone. 相似文献
99.
Tatsuya Omori Kenji Matsuda Naofumi Yokoyama Ken-ya Hashimoto Masatsune Yamaguchi 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2007,54(10):1943-1948
This paper discusses a technique to suppress spurious transverse mode responses appearing in ultra-wideband SAW resonators fabricated on a Cu-grating/15 degrees YX-LiNbO3 structure. The basic idea of the technique is inserting length- and width-weighted dummy electrodes between a bus-bar and interdigital electrodes. For practical device design, an analysis was made to show how the profile (field distribution) of both dominant and spurious transverse modes depends on the length and width (equivalent to SAW velocity) of the dummy electrodes. IDT-type SAW resonators were fabricated on a Cu-grating/15 degrees YX-LiNbO3 structure using the length- and width-weighted dummy electrodes. The experimental results were in good agreement with the theoretical analysis and prediction, showing that the proposed technique is effective in suppressing the spurious responses caused by the transverse modes. 相似文献
100.
Fast and compact central arbiter circuits for detection and regulation of access conflicts in memories with multiple ports are proposed. A layout study in 0.5 μm, 2 metal CMOS technology verifies that area-overhead and access time penalty are small up to 32 ports 相似文献