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1.
In this paper, we examine the classification performance of fuzzy if-then rules selected by a GA-based multi-objective rule selection method. This rule selection method can be applied to high-dimensional pattern classification problems with many continuous attributes by restricting the number of antecedent conditions of each candidate fuzzy if-then rule. As candidate rules, we only use fuzzy if-then rules with a small number of antecedent conditions. Thus it is easy for human users to understand each rule selected by our method. Our rule selection method has two objectives: to minimize the number of selected fuzzy if-then rules and to maximize the number of correctly classified patterns. In our multi-objective fuzzy rule selection problem, there exist several solutions (i.e., several rule sets) called “non-dominated solutions” because two conflicting objectives are considered. In this paper, we examine the performance of our GA-based rule selection method by computer simulations on a real-world pattern classification problem with many continuous attributes. First we examine the classification performance of our method for training patterns by computer simulations. Next we examine the generalization ability for test patterns. We show that a fuzzy rule-based classification system with an appropriate number of rules has high generalization ability. 相似文献
2.
Weon-Pil Tai Tadahiko Watanabe Nathan S. Jacobson 《Journal of the American Ceramic Society》1999,82(1):245-248
The high-temperature stability of alumina (Al2 O3 ) in argon and argon/water-vapor (Ar/H2 O) environments has been investigated. Samples were exposed at temperatures of 1300°C–1700°C for 10 h. The microstructure, flexural strength, and volume all showed significant changes in the Ar/H2 O environment at 1700°C. Samples also became whiter, because of the oxidation of graphite impurities that had diffused from the hot-processing dies. In the Ar/H2 O environment at 1700°C, grain-boundary etching occurred and was much more severe than in the pure-argon environment, which was very likely caused by the enhanced formation of gaseous Al(OH)3 and Al(OH)2 along grain boundaries. In addition, in the Ar/H2 O environment, substantial grain growth occurred in the surface vicinity. This grain growth, together with grain-boundary etching, led to a decrease in flexural strength. 相似文献
3.
Toughening of Silicon Nitride Matrix Composites by the Addition of Both Silicon Carbide Whiskers and Silicon Carbide Particles 总被引:1,自引:0,他引:1
Hironori Kodama Takaaki Suzuki Hiroshi Sakamoto Tadahiko Miyoshi 《Journal of the American Ceramic Society》1990,73(3):678-683
Si3 N4 matrix composites reinforced by SiC whiskers, SiC particles, or both were fabricated using the hot-pressing technique. The mechanical properties of the composites containing various amounts of these SiC reinforcing materials and different sizes of SiC particles were investigated. Fracture toughness of the composites was significantly improved by introducing SiC whiskers and particles together, compared with that obtained by adding SiC whiskers or SiC particles alone. On increasing the size of the added SiC particles, the fracture toughness of the composites reinforced by both whiskers and particles was increased. Their fracture toughness also showed a strong dependence on the amount of SiC particles (average size 40 μm) and was a maximum at the particle content of 10 vol%. The maximum fracture toughness of these composites was 10.5 MPa·m1/2 and the flexural strength was 550 MPa after addition of 20 vol% of SiC whiskers and 10 vol% of SiC particles having an average particle size of 40 μm. These mechanical properties were almost constant from room temperature to temperatures around 1000°C. Fracture surface observations revealed that the reinforcing mechanisms acting in these composites were crack deflection and crack branching by SiC particles and pullout of SiC whiskers. 相似文献
4.
5.
Tadahiko Kawai Nobutoshi Yoshimura 《International journal for numerical methods in engineering》1969,1(1):123-133
The large deflection problem of a rectangular plate is analysed by using the finite element method and employing the iteration technique. In the present study, the stiffness matrix of a rectangular plate element for bending proposed by Greene is employed, and results of numerical examples duly justifies applicability of the present method. 相似文献
6.
An anhydrous alumina (Al2 O3 ) sol was prepared from aluminum isopropoxide and an organic solvent, using an acetic acid stabilizer. The complete conversion of the dried sol to α-Al2 O3 was accomplished at a temperature of 950°C by a single transition via γ-Al2 O3 . Al2 O3 that was deposited via dip coating resulted in amorphous films, even after annealing at 1100°C, because of the silicon diffusion from the substrate. This phenomenon was avoided using a rapid thermal treatment in a flame after dip coating, which resulted in uniform thin films that are converted to α-Al2 O3 via heat treatment. 相似文献
7.
Mikami Tadahiko 《精细化工原料及中间体》2014,(12)
正专利提供了生产阻燃性聚酯的方法,聚酯通过共聚含有高浓度的磷,共聚物具有高聚合度,而且二乙二醇组分的共聚合度低,不易变色。生产阻燃聚酯的方法包括边搅拌组成物边加热的步骤,组成物含有下述(A)-(E)的组分:(A)用通式(1)表示的磷化合物;(B)不饱和的二羧酸或其形成的酯化合物;(C)由以乙二醇为主所构成的饱和脂肪烃多元醇和/或酯-形成性的衍生物;(D)(B)成分外的多元羧酸或 相似文献
8.
Masaki T Ishikawa T Paradis PF Yoda S Okada JT Watanabe Y Nanao S Ishikura A Higuchi K Mizuno A Watanabe M Kohara S 《The Review of scientific instruments》2007,78(2):026102
A compact electrostatic levitator was developed for the structural analysis of high-temperature liquids by x-ray diffraction methods. The size of the levitator was 200 mm in diameter and 200 mm in height and can be set up on a two axis diffractometer with a laboratory x-ray source, which is very convenient in performing structural measurements of high-temperature liquids. In particular, since the laboratory x-ray source allows a great amount of user time, preliminary or challenging experiments can be performed with trial and error, which prepares and complements synchrotron x-ray experiments. The present small apparatus also provides the advantage of portability and facility of setting. To demonstrate the capability of this electrostatic levitator, the static structure factors of alumina and silicon samples in their liquid phases were successfully measured. 相似文献
9.
Uematsu Y Suzuki K Iida K Hirata K Ueta T Kamata K 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2002,43(5):295-300
A large volume injection head-space GC method was established for measuring low levels of residual methanol and ethanol in licorice extract used a food additive. A vial was kept at 50 degrees C in the oven of the head-space sampler. Injection of the head-space gas for 0.75 min into a Poraplot Q GC column with a initial oven temperature of 35 degrees C, enabled the determination of low levels (5 micrograms/g) of methanol and ethanol. The standard deviations for five rounds of analysis of methanol and ethanol in licorice extracts were between 0.82 and 2.97. Methanol was found in 6 samples out of 9 collected in 1999, at concentrations exceeding 50 micrograms/g, the limit set by the Japanese Government, established in 1999 and coming into force on April 1, 2000. The highest concentration reached 10,000 micrograms/g. Methanol at a concentration exceeding 50 micrograms/g was found in 2 out of 9 samples collected in 2000. The highest concentration was 270 micrograms/g. 相似文献
10.
Akiko Ishikura Akitoshi Mizuno Masahito Watanabe Tadahiko Masaki Takehiko Ishikawa Shinji Kohara 《Journal of the American Ceramic Society》2007,90(3):738-741
High-energy synchrotron X-ray diffraction experiments were performed for clathrate-forming barium–germanium (Ba–Ge) alloys in the liquid state near the eutectic composition. The accurate structure information of highly reactive melts has been obtained by applying electrostatic levitation technique as a containerless method. The structure information obtained from the reverse Monte Carlo simulation suggests that the short-range ordering between the Ge atoms occurs with the addition of Ba atoms in the liquid Ba–Ge alloys. This can be associated with the formation of the cage-like structure composed of the Ge atoms in the liquid alloys near the eutectic composition. 相似文献