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91.
K. Yasuda M. Niraula H. Oka T. Yoneyama K. Matsumoto H. Nakashima T. Nakanishi D. Katoh Y. Agata 《Journal of Electronic Materials》2010,39(7):1118-1123
Electrical properties of halogen-doped CdTe layers grown on Si substrates using iodine and chlorine dopants are presented.
No change in electrical properties of the layers was observed with chlorine as a dopant. However, doping with iodine resulted
in highly conductive n-type layers or highly resistive p-type layers depending upon the growth conditions, even though a similar amount of dopant was introduced into the growth chamber.
Layers grown at 560°C, with a vapor-phase Te/Cd precursor ratio of 3.0, were p-type. The resistivity of the layers remained unchanged for low dopant supply rates, but increased abruptly when the dopant
supply rate was increased beyond a certain value. On the other hand, layers grown at 325°C with Te/Cd ratios from 0.1 to 0.25
were n-type. A maximum free electron concentration of 1.3 × 1017 cm−3 was obtained at room temperature. The types and conductivities of the grown layers were strongly dependent on the growth
conditions. 相似文献
92.
K Yoneyama 《Scanning》2001,23(6):359-365
We evaluated the morphology and physiologic function of the bile canaliculi (BC) in the rat liver slice (RLS) by confocal laser scanning microscopy (CLSM). Lucifer yellow (LY) dye was injected into the RLS, and the distribution of LY was serially evaluated. After the injection of LY, hepatocytes were initially visualized, followed by visualization of the BC. There was no significant difference in the distribution of LY between zones 1 and 3 in the hepatic lobule. In zone 1, the reticular distribution of the BC was observed, whereas the part of BC was linearly visualized in zone 3 along the course of sinusoids. When changes in the bile canalicular fluorescence (BCF) were serially evaluated, the BCF was decreased to the minimal level (88% of the value obtained immediately after the LY injection) 10 min after the LY injection, and it tended to increase thereafter. The intralobular hepatocyte fluorescence (ILHF) was decreased to 58.9% of the initial value during the first 40 min. However, the ILHF was transiently increased 30 min after the LY injection, suggesting the possibility of reabsorption of LY by hepatocytes. Three-dimensional (3-D) reconstruction images of the BC facilitated the evaluation of the stereoscopic structure of BC. Confocal laser scanning microscopy facilitated the evaluation of structures and physiologic function of the BC. 相似文献
93.
Masato Okada Satoshi Kitayama Kiichiro Kawamoto Junpei Chikahisa Takeshi Yoneyama 《Structural and Multidisciplinary Optimization》2015,51(1):225-237
This paper proposes a method for determining optimal back-pressure profile in forging of aluminum alloy using a sequential approximate optimization (SAO). In forging, it is important to improve the mold filling for the product quality. In addition, it is preferable to produce a product with a minimum forming energy. To achieve these objectives simultaneously, a forging method with back-pressure profile is proposed. Here, the back-pressure profile implies that the back-pressure varies through the stroke. In this paper, a multi-objective optimization (MOO) problem is formulated. To improve the mold filling, an unfilled area is taken as the first objective function. Furthermore, a forming energy during the forging is taken as the second objective function. Numerical simulation in the forging is so expensive that the SAO using the radial basis function (RBF) network is adopted, and the pareto-frontier is identified with a small number of simulation runs. Based on the numerical result, the experiments are also conducted. It can be found from these results that, the back-pressure profile approach is valid for improving the mold filling as well as the forming energy. 相似文献
94.
Summary Thioether containing polyimides were prepared by displacement of chlorine groups from substituted imides by aromatic and aliphatic sulfur nucleophiles. The allaromatic monomers and polymers had poor solubility which led to precipitation during synthesis and low molecular weight polymers. However, these polymers were thermally stable up to 400 °C and had Tg's ranging from 212 °C to 233 °C. Poly(thioether imide)s prepared from 1,3-propanedithiol and 2-mercaptoethyl sulfide had good solubility but lower thermal stability, showing TGA loss onset temperatures of 297 °C and 298 °C, respectively. 相似文献
95.
96.
Murata K. Otsuji T. Yoneyama M. Tokumitsu M. 《Solid-State Circuits, IEEE Journal of》1998,33(10):1527-1535
This paper describes a 4O-Gbit/s decision integrated circuit (IC) fabricated with 0.12-μm gate length GaAs metal-semiconductor field-effect transistors (MESFET's). A superdynamic flip-flop circuit and a wide-band amplifier were applied in order to attain 40-Gbit/s operation. A conventional static decision IC was also fabricated for comparison. The dynamic decision IC operated up to 40 Gbit/s, which is twice as fast as the conventional static decision IC. Error-free 40-Gbit/s operation is the fastest among GaAs MESFET decision IC's 相似文献
97.
The influence of the thermal properties of the media in a multilayered magnetooptical disk on thermomagnetic recording characteristics such as recorded bit size and sensitivity has been investigated. Thermal properties have been simulated using several different dielectrics and metals for both undercoat and overcoat layers. Media with oxide layers represent those having low thermal diffusivity and large heat capacity, whereas nitride layers represent those with high thermal diffusivity and small heat capacity. Small domains are formed when an Al layer covers a Ta2O5 overcoat. Both recording sensitivity and bit-size increase for media with nitride layers compared with those having an Al top coat. When the same recording power is applied, media with oxide layers provide the most sensitive disks with the largest recorded bit-size among the structures studied. The results are explained by the differences in the heat capacities of the media together with the differences between the vertical and lateral heat flow throughout the layered structure 相似文献
98.
T Yamaguchi N Yokoo Y Kitakado T Shiroko M Futamura T Yoneyama S Mori H Azuma K Yonezawa K Shimizu T Yoshida S Tanabashi 《Canadian Metallurgical Quarterly》1997,44(17):1339-1341
A patient with colon carcinoma complicated by polycythemia vera (PV) who underwent a partial colectomy concomitant with prophylactic perioperative treatment resulting in successful outcome is herein described. Seven weeks after the cessation of the latest exacerbation of PV, a partial colectomy was performed. In order to prevent the development of disseminated intravascular coagulation and thrombotic complications, the following perioperative treatment was performed: administration of gabexate mesilate (2,000 mg/day), fresh frozen plasma (300 ml/day), heparin (5,000 IU/day) for 7 days and anti-thrombin-III for 4 days, and a potent antibiotic therapy for 12 days and graded elastic bandages around the bilateral lower extremities for 14 days. As a result, an uneventful postoperative course was achieved. The present case suggests that these treatments are useful in the perioperative management of PV patients. 相似文献
99.
Wave guiding properties of a periodic metal plate-loaded dielectric slab structure are investigated for obtaining surface wave antennas with broadside radiation and low voltage standing wave ratio (VSWR) characteristics. A novel technique is proposed in which dielectric phase transformers play an essential role for realizing a uniform phase distribution on the radiating aperture which is required to achieve broadside radiation. A quarter-guided wavelength spacing of the metal plates guarantees the suppression of reflections at the input port. On the basis of the theoretical results obtained, two types of antennas have been designed at 10 GHz, one having the exponential aperture distribution, the other the uniform aperture distribution. The overall antenna efficiency of the latter type has been found to be 53%, exhibiting a practical performance at microwave frequencies 相似文献
100.
Toshihiro Kawase Keiichi Ohishi Kazuya Yoneyama Hiroyuki Kambara Yasuharu Koike 《Robotics and Autonomous Systems》2012,60(5):742-746
In order to elucidate the mechanism for predicting timing of contact, we performed an investigation of the adaptation process for shifts in the timing of visual and tactile stimuli. In our experiments, the visual stimulus was a virtual ball falling at 9.8 m/s2 for any tactile stimulus. Tactile stimuli were shifted by ?60, 0 and +60 ms, relative to the visual stimulus. Results showed that the subjects were not aware of the timing shifts, but still changed the timing of their tactile responses. This adaptation was also found to cause a shift in the subjects’ judgment of visuotactile simultaneity by approximately 60 ms. 相似文献