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61.
62.
A divide-by-256/258 dual-modulus prescalar IC has been successfully fabricated using enhancement-mode GaAs JFETs. The maximum operation frequency of 10.4 GHz is obtained by a 0.5 mu m gate length and buried p-layer JFET technology. The prescalar IC has sufficient operational margin to make it compatible with Si bipolar ECL circuits over a wide frequency range.<> 相似文献
63.
Kenji Tominaga Kumiaki Moriya Masayoshi Matsuura Takahiko Hida 《Progress in Nuclear Energy》2005,47(1-4):106-114
Nuclear power is expected to become the main source for electric power generation in Japan for the reasons of energy security and prevention of CO2 emission. In addition, the slowdown of recent electric power demand and the liberalization of the electric power market are accelerating medium and small sized reactor development. (Hida and Ito, 2003) Furthermore, the needs of medium and small sized reactors have become greater in foreign countries where electric grid systems are weak. Under these circumstances, Hitachi has developed DMS's (Double MS: Modular Simplified & Medium Small Reactors) as 400 MWe class LWR's supported by The Japan Atomic Power Company. (Moriya et al., 2003) In addition, DMS's have been designed based on proven technology that requires no large-scale development, and can therefore be introduced in the market in near future. 相似文献
64.
Step-aging programs, based on principles of particle-dislocation interactions, were developed systematically to obtain increases in the high-temperature strength and ductility properties of Ti-7 at. pct Mo-Al alloys. A triple-step aging program applied to Ti-7 Mo-16 Al produced a yield stress σ0.2 = 1,500 MN/m2, elongation to fracture ε F = 4 pct at room temperature, and σ0.2 = 900 MN/m2, ε F = 12 pct at 600°C. A two-step aging program resulted in σ0.2 = 1,350 MN/m2, ε F = 5 pct at room temperature; σ0.2 = 800 MN/m2, ε F = 20 pct at 600°C. 相似文献
65.
Atsuo Honda Koichiro Tezuka Tomohito Okamura Kaoru Kawamoto Shoji Shimizu Kohei Harada Takahito Tanabe Tatsuya Shirakawa Tomohiro Takahashi 《Electrical Engineering in Japan》2019,206(4):22-35
Osaka Gas Co., Ltd., jointly with NTT DATA Mathematical Systems Inc., has developed unit‐commitment model for optimizing dispatch of power generation units. Main purpose of this development is to simulate the future world of electric power system in accordance with national energy policy aiming to introduce large amount of renewable energy as well as vitalized cross‐border power exchange via PX market to enhance economically‐efficient power system operation. The model incorporates not only constraints of supply‐demand balance but also constraints of operating reserves, regulation reserves, maximum CO2‐emissions, etc. 相似文献
66.
Mikimasa Iwata Toshiya Ohtaka Yutaka Goda Masatoshi Tanezaki Tomohito Hamakawa Kentaro Kamimura 《IEEJ Transactions on Electrical and Electronic Engineering》2019,14(11):e14-e20
Lightning to an overhead transmission line system can cause a breakdown between arcing horns of the lower line and a jumper wire of the upper line due to the rising of hot gases generated by arc jets between arcing horns. This article describes the experiments and the calculations regarding the rising of the hot gases for the case of 66 kV overhead transmission lines. The calculations were carried out considering the length of the arc jet, the electromagnetic force acting between the arc jet and the arc column, the force due to the arc jet spouting from the arcing horn, and the buoyant force of the hot gases for various arc currents and two types of arcing horn. As a result, it was found that the calculation results showed a tendency similar to the experimental ones. Furthermore, the breakdown phenomena between the arcing horns and the jumper wire were also investigated using the calculation results. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
67.
S. Rolando Cruz‐Ramírez Yasushi Mae Tatsuo Arai Tomohito Takubo Kenichi Ohara 《Computer-Aided Civil and Infrastructure Engineering》2011,26(5):336-355
Abstract: New robotic systems are going to play an essential role in the future dismantling service for renewing office interiors in buildings. In dismantling tasks, robots are expected to be able to find and remove very small parts such as screws and bolts. Such recognition of small parts is difficult for robots. The article describes a vision‐based hierarchical recognition applied to dismantling tasks where large structures are detected at first, thus small parts attached to these structures are detected easier. Regarding the items in the ceiling side, after the dismantling task of the ceiling panels, it is necessary to remove carefully the screws that once held these panels to the light gauge steel (LGS), with the purpose of reusing it. With the pose detection of the large structure (LGS) and considering a robot arm with a stereo camera on its tip, a trajectory near that structure can be computed to detect the small parts, in this case the screws. The large structure is detected by using a process of line detection in 2D and its 3D pose is measured with the stereo camera. During the motion along the structure, the screws are detected by applying a multi‐template matching process to every captured image. Followed by, the Support Vector Machine (SVM), which recognizes those screw candidates with high true positive rate and low false positive one. These rates are improved with a temporal multi‐image integration for tracking the screw candidates. In the experiment, 10 actual screws distributed in 1.1 m along a linear segment on the LGS are successfully recognized with a few false positives and with a final computed 3D position of 2 mm in average. Feasibility of methodology is evaluated by experimentation under different lighting conditions in a realistic environment. Experimental results show that the method works well to be applied in an actual dismantling site. 相似文献
68.
Lanthanide selective adsorbent with chelidonic acid monoamide group was synthesized based on the ion-imprint method and its adsorption character was investigated. A polymerizable ligand 3 with chelidonic acid group was obtained by condensation of chelidonic acid and 4-aminostyrene. A Nd-complex monomer 7 was synthesized from the obtained ligand 3 and Nd(NO3)3. Copolymerization of the Nd-complex monomer, styrene and divinylbenzene afforded Nd-containing polymer 8. To obtain Nd-imprinted polymer 9, Nd ion was removed by hydrochloric acid. A non-imprinted polymer 6 composed by 3, styrene and divinylbenzene was also synthesized. Elemental analysis revealed that the content of chelidonic acid monoamide ligand in the 6 and 9 is 1.70 and 1.56 mmol·g?1, respectively. BET method indicated that 6 and 9 has specific surface area of 14.7 and 1.51 m2·g?1, respectively. Nd adsorption experiments revealed 9 exhibits imprinting factor (IF) 4.3 at initial concentration 0.4 mmol-Nd/L, despite 9 has 0.92-fold of ligands and 0.1-fold of specific surface area of 6. Mixed ion solution including Nd, Dy, Cu, Zn, and Co was used as a model solution for an adsorption experiment. 9 exhibits high lanthanide selectivity in a range of pH of 3.0–7.0 and a maximum adsorption amount at pH 3.75, despite 6 shows the maximum at pH 5.0. Density functional theory (DFT) calculation of a model system revealed that the ion-imprint effect and inhibition effect is cause of large adsorption amount of 9. 相似文献
69.
Tomohito Kameda Yuuzou Fukuda Guido Grause Toshiaki Yoshioka 《Polymer Engineering and Science》2011,51(6):1108-1115
The chemical modification might become an alternative to the thermal degradation of waste polyvinylchloride (PVC). Therefore, the nucleophile substitution of chlorine from flexible PVC by hydroxide (OH?), thiocyanate (SCN?), azide (N3?), and iodide (I?) was investigated in ethylene glycol (EG) at 190°C. With the exception of I?, all nucleophiles used resulted in substitution yields of about 20%. However, also high elimination yields were observed. When SCN was used as the nucleophile, the substitution/elimination ratio increased with decreasing temperature. The product at 150°C contained a mixed structure of thiocyanate and isothiocyanate groups, while at 190°C, only the structure of isothiocyanate was present the product, due to the isomerization of the ? S? C?N group under the formation of ? N?C?S at elevated temperatures. The substitution and dehydrochlorination yields increased with an increasing molar SCN/Cl ratio. When EG was replaced by diethylene glycol (DEG) or triethylene glycol (TEG), the dehydrochlorination was found to proceed more rapidly. The use of a solvent with a lower polarity improved the contact between the solvent and the polymer; however, solvents with a lower polarity favor the elimination over the substitution. Therefore, the substitution–elimination ratio increased in the order EG > DEG > TEG. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers. 相似文献
70.
Hiroyuki Kono Tomohito Ichiki Hideharu Mori Hisayuki Nakatani Minoru Terano 《Polymer International》2001,50(5):568-571
Block copolymerization of propene and 1,5‐hexadiene was carried out by a modified stopped‐flow polymerization method with an MgCl2‐supported Ziegler catalyst. The resulting polymer, polypropene‐block‐poly(methylene‐1,3‐cyclopentane‐co‐propene) (PP‐b‐(PMCP‐co‐PP)), in which the crystallizable PP part was linked with the non‐crystallizable PMCP‐co‐PP part, was characterized by optical microscopy, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and tensile testing. The block copolymer having a chemical linkage between PP and PMCP‐co‐PP showed properties different from those of homopolymer, random copolymer and blend polymer. © 2001 Society of Chemical Industry 相似文献