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排序方式: 共有85条查询结果,搜索用时 15 毫秒
41.
42.
MORISHIGE KIMURA 《International journal of systems science》2013,44(5):701-711
If the doubling algorithm (DA) for the discrete-time algebraic Riccati equation converges, the speed of convergence is high. However, its convergence has not yet been examined exactly. Firstly, a certain matrix appearing in the DA is shown to be non-singular and therefore the algorithm is well defined. Secondly, it is found that the loss of significant digits hardly occurs in the DA. Finally, it is proved that if the time-invariant discrete-time linear system, whose state is estimated by the steady-state Kalman filter, is reachable and detectable, or stabilizable and observable, then all three matrix sequences in the DA converge. 相似文献
43.
利用自制移动区熔炉生长了CsPbBr3晶体, 事先采用相同工艺合成了高纯多晶原料以去除杂质和水分。通过工艺优化获得了大尺寸CsPbBr3晶体, 达到ϕ25 mm× 60 mm。该晶体呈橘红色, 在600~2000 nm波长范围内具有透过率达78.6%的优异透光性能。热分析表明, 所得CsPbBr3晶体在88.1℃和131.25℃时存在正交-四方和四方-立方相变。计算得到CsPbBr3晶体的带宽Eg= 2.25 eV。上述结果表明移动区熔法是一种具有应用潜力的制备高质量大尺寸CsPbBr3晶体的生长方法。 相似文献
44.
45.
Semi-continuous Hydrolysis of Sweet Potato Raw Starch by Chalara paradoxa Glucoamylase 总被引:2,自引:0,他引:2
TAKAHIRO NODA TOSHIO OHTANI TAKEO SHIINA YOSHIHIKO NAWA 《Journal of food science》1992,57(6):1348-1352
Effect of preservatives was investigated on semi-continuous digestion of sweet potato raw starch by Chalara paradoxa glucoamylase which digests both raw and gelatinized starch. Potassium metabisulfite strongly inhibited raw starch digesting activity (RDA) although gelatinized starch digesting activity was only slightly inhibited. Potassium sorbate, among the preservatives examined, showed the weakest inhibition (below 10%) on RDA. In the presence of potassium sorbate, semi-continuous digestion of sweet potato raw starch in a 20L scale hollow fiber UF membrane pilot reactor proceeded efficiently at 30% (w/v) initial concentration of raw starch at pH 5.0 and 40°C. Glucose production was 5.7 to 6.0 g/hr/L. 相似文献
46.
Preparation and Characterization of Machinable Mica Glass-Ceramics by the Sol-Gel Process 总被引:4,自引:0,他引:4
TOSHIO HAMASAKI KATSUYA EGUCHI YOSHINORI KOYANAGI AKIRA MATSUMOTO TAIZO UTSUNOMIYA KEIICHIROU KOBA 《Journal of the American Ceramic Society》1988,71(12):1120-1124
The preparation and characterization of machinable mica glass-ceramics by the sol-gel process are described. The thermal behavior of the precursor and the optimum conditions for calcination, molding, and sintering are given. Physical, chemical, thermal, electrical, and mechanical properties are investigated, and the machinability of the ceramics is discussed. 相似文献
47.
TOSHIO KIMURA KUNIYOSHI KOHMURA TAKASHI YAMAGUCHI 《Journal of the American Ceramic Society》1982,65(1):61-64
This paper describes the ordering mechanisms observed in Li ferrite powder samples with different particle sizes and aggregation states, as well as in sintered pellets. Measurement of ordering rates in the powder samples and observation of chemically etched surfaces of partially ordered pellets indicate that the ordering proceeds by a nucleation-growth mechanism and that the ordering initiates at grain boundaries and prevails into the inner part of the grains. In powder samples, surfaces as well as grain boundaries contribute to the initiation of ordering but their temperature dependences are different. The activation energy of the ordering is calculated to be 192 kj/mol. 相似文献
48.
ZHANG Feng OKAWA Katsunori KIMURA Makoto 《Frontiers of Structural and Civil Engineering》2008,2(3):233
In this paper, dynamic behavior of a group-pile foundation with inclined piles in loose sand has been investigated with centrifuge model tests. The test results are also simulated with elastoplastic dynamic finite element method, in which, not only sectional force of piles, stress of ground, but also deformation of piles are calculated using a three-dimensional elastoplastic dynamic finite element analysis (Code name: DGPILE-3D). The numerical analyses are conducted with a full system in which a superstructure, a pile foundation and surrounding ground are considered together so that interaction between pile foundation and soils can be properly simulated because the nonlinearities of both the pile and the ground are described with suitable constitutive models. Different types of piles, vertical pile or inclined pile, are considered in order to verify the different characteristics of a group pile foundation with inclined piles. The validity of the calculation is verified by the model tests. 相似文献
49.
This paper deals with fuzzy scheduling and path planning problems by genetic algorithms. We have proposed a self-organizing manufacturing system (SOMS) that is composed of a number of autonomous modules. Each module decides output through interaction with other modules, but the module does not share complete information concerning other modules in the SOMS. Therefore, we require structured intelligence as a whole system. In this paper, we consider a manufacturing line composed of machining centres and conveyor units. The manufacturing procedure can be divided into a sequence of three modules: (a) tool locating module, (b) scheduling module, and (c) path planning module. The tool locating problems have been already solved. In this paper, we first solve the scheduling problem as global preplanning. Here we assume that the processing time is not constant, because some delay may occur in the machining centres. We therefore apply fuzzy theory to represent incomplete information abou t the machining time. We solve the fuzzy scheduling problem with a genetic algorithm. After global preplanning, the path planning module transports materials and products. Next, the scheduling module acquires the actual processing time of each machining centre. Based on the processing time, the schedule module generates a fuzzy number for the processing time. We discuss the effectiveness of the proposed method through the computer simulation results. 相似文献
50.
With jumping mechanisms,soft landing motion is important to protect loads and the mechanisms.This study proposes a leg mechanism for soft landing based on biological motion.Human jumping motion with a load suggests a unique motion for soft landing.The landing model consists of two periods.Jerk is minimized in the first period and force is minimized in the second period.In comparison with other landing models,this model is specialized for soft landing motion protecting an objective part.Given all mechanisms ... 相似文献