排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
KAZUO TORAICHI KAZUKI KATAGISHI IWAO SEKITA RYOICHI MORI 《International journal of systems science》2013,44(5):945-954
The procedure for composing the spline function of order m that interpolates n data is roughly divided into two stages: (1) constructing the matrix An that transforms the fl-spline coefficient vector c into the sample value vector s; and (2) calculating the vector c. Then the effects of boundary conditions and the locations of the sampling points and the knots on the number of computations for spline interpolation are evaluated. There are no boundary condition effects of the construction of A" for equispacing. Non-periodic boundary conditions reduce the number of computations needed to calculate c from O(m2n) to O(m2n/4). In the construction of An, choosing equispaced sampling points reduces the number of computations from O(m2n) to O(m2) in the case of sampling points located at a constant interval between each pair of adjacent knots. In the calculation of c, equispaced sampling points reduce the number of computations from O(m2n) to O(m2n /2) in the case where m is even and the locations of the knots are identical with those of the sampling points. 相似文献
2.
HIDETOSHI KOKA RYOICHI NAGANUMA YUJI ENOMOTO MASASHI KITAMURA SATOSHI KIKUCHI 《Electrical Engineering in Japan》2016,194(3):43-50
Clawtooth motors have the feature that they can be made thin in the axial direction. This makes them suitable for appliances, automobile accessories, and small‐sized industrial motors. On the other hand, there is a need for thinner HEV and elevator motors and large‐sized industrial motors. In this study, we examined ways of increasing the output of clawtooth motors. We arrived at the following conclusions. (1) The optimal stator structure was determined and the prospects of attaining the target specification of 123 N‐m were determined. (2) Three important manufacturing tasks, assurance of core assembly accuracy, thin coil manufacture, and rotator insertion, were identified. (3) Experimental results and the results of analysis were in agreement with respect to the EMF. (4) The experimental cogging torque results and finite element analysis (FEA) results were in agreement with the FEA results at sixth order but not at second and fourth order. (5) Although the core needed to be divided in the circumferential direction in order to increase its size, it was clear that the influence on the torque was small. (6) Use of a divided core is a good solution for enlargement of clawtooth motors. 相似文献
3.
Nonami T Kamiya A Naganuma K Kameyama T 《Journal of materials science. Materials in medicine》1998,9(4):203-206
In order to obtain a biomaterial that has both biological affinity and high mechanical strength, hydroxyapatite (HAp) granules were implanted into the surface of superplastic titanium-alloy. HAp granules (32–38 m diameter) were spread over a superplastic titanium-alloy substrate and pressed to implant the granules into the substrate. This was achieved at 17 MPa, 750 °C for 10 min. Only the tops of the granules, which were surrounded by the alloy, remained exposed and they were firmly stuck in the substrate. The granules were enclosed in titanium-alloy and a reaction layer was formed at their interface. The HAp-implanted titanium-alloy composites are expected to be useful as biomaterials, such as artificial bones and dental roots. © 1998 Chapman & Hall 相似文献
4.
KAZUO TORAICHI MASARU KAMADA SHUICHI ITAHSHI RYOICHI MORI 《International journal of systems science》2013,44(12):2491-2505
The rectangular, triangular, and Parzen windows, which have been defined independently of each other, are obtained by repeating convolution integrals of the rectangular window with itself. They are extended to make a series of window functions. This series has the advantage that the sidelobe fall-off is variable though it has the disadvantage that the mainlobe band-width for the same highest sidelobe level is 1–1·3 times those of the gaussian, Kaiser, Dolph–Chebyshev or Blackman–Harris windows. Moreover, this series has a desirable mainlobe bandwidth of 0·85–1 times that of cosx x windows for the same highest sidelobe level and sidelobe fall-off. Thus, this series is useful in designing window functions whose mainlobe bandwidth is in between that of the gaussian or Kaiser windows and that of cosx x windows and whose sidelobe fall-off is as good as that of the cosx x windows. 相似文献
5.
EFFECT of MODIFIED ATMOSPHERE PACKAGING ON GLUTATHIONE and ASCORBIC ACID CONTENT of ASPARAGUS SPEARS
MICHIHIKO SAITO DEEPAK RAJ RAI RYOICHI MASUDA 《Journal of Food Processing and Preservation》2000,24(3):243-251
Asparagus (Asparagus Officinalis L.) spears were packaged in ordinary and microperforated oriented polypropylene (OPP) films and were stored at 15C and 75% RH for up to 10 days. CO2 concentrations ranged from 15.5 to 23% at 10 days of storage. Weight loss was less than 1.2% in microperforated film packages compared with 15% in air storage under similar conditions. Ascorbic acid content was found to be adversely affected at all the O2 levels (1–6%) prevailing in microperforated film packages, but it was retained to the extent of 45–55% of its original concentration in ordinary OPP film packaged asparagus. the O2 concentrations in microperforated film packages were also associated with higher glutathione concentrations in packed asparagus spears. Results of the study indicated that to preserve ascorbic acid and glutathione simultaneously in stored asparagus through MAP under high CO2 and low O2 conditions, O2 concentration levels must be selected between 1 and 6% in such a way so as to get acceptable retention levels of ascorbic acid and glutathione. 相似文献
6.
An autonomous decentralized scheduling algorithm for a scheduling problem in a metal mould assembly process 总被引:1,自引:0,他引:1
HITOSHI IIMA RYOICHI KUDO NOBUO SANNOMIYA YASUNORI KOBAYASHI 《Journal of Intelligent Manufacturing》1999,10(2):161-167
This paper deals with a scheduling problem in a metal mould assembly process. The process is of job shop type with several additional constraints. One constraint is that precedence relations exist not only among operations but also among jobs. The other constraint is that the system has two types of machines in parallel. The single-function machine executes a specific operation of each job and the multi-function machine can execute several operations. Therefore selection of the machine is necessary for executing each operation. In addition the problem has two objective functions. One is to minimize the sum of the tardiness of each job, and the other is to maximize the working time of the multi-function machine because of reducing the operating cost of machines. An autonomous decentralized scheduling algorithm is proposed to obatin a compromise solution of the multi-objective problem. In this algorithm, a number of decision makers are called subsystems, which co-operate with one another in order to attain the goal of the overall system. In our algorithm, all jobs and the set of multi-function machine are defined as the subsystem because their objective functions are competitive. They determine the scheduling plan on the basis of their co-operation and the satisfaction of their own objective function levels. The effectiveness of the algorithm is investigated by examining numerical results. 相似文献
7.
JUN KAMEDA RYOICHI INOGUCHI DAVID J. PRIOR† & TOSHIHIRO KOGURE 《Journal of microscopy》2007,228(3):358-365
We present a new method for the morphological analyses of minute faceted crystals by combining stereo-photogrammetric analysis of scanning electron microscope images and electron back-scattered diffraction. Two scanning electron microscope images of the same crystal, recorded at different tilt angles of the specimen stage, are used to determine the orientations of crystal edges in a specimen-fixed coordinate system. The edge orientations are converted to the indices [ uvw ] in the crystal system using the crystal orientation determined by electron back-scattered diffraction analysis. The Miller indices of crystal facets are derived from the indices of the edges surrounding the facets. The method is applicable to very small crystal facets. The angular error, as derived from tests using a calcite crystal of known morphology, is a few degrees.
To demonstrate the applicability of the method, the morphology of boehmite (γ-AlOOH) precipitated from solution during the dissolution of anorthite was analyzed. The micrometre-sized boehmite crystals are surrounded by two {010} basal facets and eight equivalent side facets that can be indexed equally well as {323}, {434} or {545}. We suggest that these side facets are in fact {111}, the morphology having been modified slightly (by a few degrees) by a small extension associated with opening along (010) microcleavage planes. Tiny {140} facets are also commonly observed. 相似文献
To demonstrate the applicability of the method, the morphology of boehmite (γ-AlOOH) precipitated from solution during the dissolution of anorthite was analyzed. The micrometre-sized boehmite crystals are surrounded by two {010} basal facets and eight equivalent side facets that can be indexed equally well as {323}, {434} or {545}. We suggest that these side facets are in fact {111}, the morphology having been modified slightly (by a few degrees) by a small extension associated with opening along (010) microcleavage planes. Tiny {140} facets are also commonly observed. 相似文献
8.
KAZUO TORAICHI IWAO SEKITA RYOICHI MORI 《International journal of systems science》2013,44(8):1547-1557
Hybrid splines whose bases are constructed by multi-order B-splines are presented. B-splines of order 2 are induced for representing corners, and those of orders 3 or 4 for representing curved parts. The hybrid splines can represent not only smooth parts (class Cm?22:m≥3) but also corners (class C°): Hybrid splines of order 2 and 4 cannot be represented by conventional splines with multiple knots. Satisfactory approximation results are obtained by hybrid splines of order 2 and 4 determined by a least-squares method. 相似文献
9.
ABSTRACT Leakage current mechanism of the polycrystalline BiFeO3 film annealing at 923 K with Pt electrodes was discussed based on Schottky-emission conduction, Poole-Frenkel trap limited conduction, Fowler-Nordheim tunneling conduction and space charge limited current (SCLC). The leakage current mechanism at room temperature is as follows; Schottky-emission or Poole-Frenkel was the candidate leakage current mechanism at low electric field and then leakage current mechanism was changed to the SCLC at high electric field. When decreasing the measuring temperature, the leakage current mechanism at low electric field was Poole-Frenkel trap limited conduction, though the electric field region of the PF trap limited conduction was much broader than that of the room temperature. 相似文献
10.
YUTA NAKAMURA RYOICHI HARA HIROYUKI KITA EIICHI TANAKA 《Electrical Engineering in Japan》2018,204(3):21-30
From growing interests in the environment issues, promotion of photovoltaic power generation (PV) is accelerated in the world. Meanwhile, rapid chargers (RCs) for popularized electric vehicles are being installed in urban areas. These two trends in distribution system might cause severer voltage fluctuation problems. On the other hand, a RC can provide the reactive power support, which is capable of voltage regulation. Based on this viewpoint, this paper proposes a new framework of voltage regulation, in which the reactive power compensation by RCs is actively utilized. The proposed voltage regulation method combines two different control functions with consideration for over‐compensation avoidance. This paper ascertains the validity of proposed voltage regulation method through numerical simulations. 相似文献