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排序方式: 共有164条查询结果,搜索用时 31 毫秒
41.
Tomonari Takeuchi Hiroyuki Kageyama Hiromi Nakazawa Toshiyuki Atsumi Shigeharu Tamura Nagao Kamijo Akihisa Takeuchi Yoshio Suzuki 《Journal of the American Ceramic Society》2008,91(8):2495-2500
Fluorine-containing indium tin oxide (F-ITO) sputtering targets were prepared using spark-plasma-sintering (SPS) process. The initial powder, which was prepared by reacting ITO with HF, was sintered to the 10 cm-disks with nearly 90% of the theoretical density by the SPS process. The resulting disks were consisted of ITO and InOF, and the fluorine content was about 4 at.%. Using the F-ITO disks as sputtering target, thin films were deposited on the glass substrates. The electrical conductivity and optical transmission of the deposited films were comparable to those of the conventional ITO films, while the surface roughness of the films was much improved. 相似文献
42.
The rolling of AM60 sheets for 50%reduction was analyzed with DEFORM to investigate the hot deformation process. The simulated results show that the sheet velocities at the entrance(21 mm/s) and at the exit(37 mm/s) are less and larger than roll velocity,respectively.From the entrance to the neutral point,the velocity at the sheet surface is greater than that at the middle point of sheet in thickness,while that from the neutral point to the exit shows the opposite pattern.The effective strain of the shee... 相似文献
43.
Shipra Chauhan Toshiyuki Mori Tomohiro Kobayashi Shunya Yamamoto Shigeharu Ito Graeme Auchterlonie Roger Wepf Shigenori Ueda Fei Ye 《Journal of the American Ceramic Society》2021,104(5):1945-1952
To develop the state-of-the-art polymer membrane fuel cells. Both maximization of oxygen reduction reaction (ORR) activity on Pt cathode and minimization of Pt content in the cathode are required. For this challenge, the defect interface on oxide support was modified by proton beam irradiation method. Pt-CeOx nanowire/C (Pt/C = 0.02) was fabricated using the proton beam irradiation method. Since the radical density generated by proton beam irradiation is two orders of magnitude greater than that of electron beam irradiation, the CeOx nanowire surface was fully converted to a thin layer of Pt-O-Ce bonds under proton beam irradiation. The ORR activity observed for fabricated sample with above active surface layer was higher than that of conventional Pt/C (Pt/C = 0.2) and comparable to that of Pt-CeOx nanowire/C (Pt/C = 0.2) fabricated by conventional methods. From the combination of microanalysis characterization and surface atomistic simulation, we concluded that the Pt-O-Ce bond was formed on defect-rich regions of the CeOx nanowire and this leads to a maximized ORR activity on the fabricated sample. Based on all experimental data, it is concluded that the surface modification of CeOx nanowire support using proton beam irradiation is useful for a lowering the Pt content of the cathode with high ORR activity. 相似文献
44.
Maruta K Watanabe H Nishimoto T Kubota M Chaen H Fukuda S Kurimoto M Tsujisaka Y 《Journal of Bioscience and Bioengineering》2006,101(5):385-390
We investigated the acceptor specificity of a thermostable trehalose phosphorylase from Thermoanaerobacter brockii ATCC 35047 (TbTP) was examined using beta-D-glucose-1-phosphate (beta-G1P) as a glucosyl donor and oligosaccharides as the acceptor. Oligosaccharides with a reducing-end glucose residue as the C-6 substituent (e.g., isomaltose, gentiobiose, melibiose, isomaltotriose, and isopanose) were found to be successful acceptors. The transfer products of isomaltose, gentiobiose, and melibiose were isolated and characterized as 6-O-alpha-D-glucopyranosyl trehalose (alpha-GlcTre), 6-O-beta-D-glucopyranosyl trehalose (beta-GlcTre), and 6-O-alpha-D-galactopyranosyl trehalose (alpha-GalTre), respectively. To produce alpha-GalTre, a novel nonreducing trisaccharide, the reaction conditions of alpha-GalTre were examined using trehalose as a glucosyl donor. As a result, the yield of alpha-GalTre reached 40.5%. 相似文献
45.
Iwabuchi N. Kawahara A. Kume T. Kabashima T. Nagasaka N. 《Industry Applications, IEEE Transactions on》1994,30(3):609-614
An entirely new concept of an electromagnetic structure which exploits the excellent characteristics of a rare-earth magnet is proposed. Thin rare-earth metal magnet pieces are mounted on the surface of the stator teeth which face the airgap. The rotor has a variable reluctance structure type. This type of motor is suitable for low-speed high-torque applications by the action of tooth and slot structure. The relationship between the performance and electromagnetic geometry is investigated through the finite element method (FEM) analysis and experiments. The principle of torque generation and the associated characteristics is also introduced 相似文献
46.
Aga H Higashiyama T Watanabe H Sonoda T Nishimoto T Kubota M Fukuda S Kurimoto M Tsujisaka Y 《Journal of Bioscience and Bioengineering》2002,94(4):336-342
Production of cyclo[-->6)-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->6)-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->] (CTS, cyclic tetrasaccharide) from starch was attempted using 1,6-alpha-glucosyltransferase (6GT) and 1,3-alpha-isomaltosyltransferase (IMT) from Bacillus globisporus C11. The optimal conditions for production from partially hydrolyzed starch were as follows: substrate concentration, 3%; pH 6-7; temperature, 30 degrees C; 6GT, 1 unit/g-dry solid (DS); IMT, 10 units/g-DS. The production of CTS was demonstrated and 544 g of CTS hydrate crystal powders were obtained from 3500 g of partially hydrolyzed starch. Two major by-products were also isolated from the reaction mixture and identified as the branched derivatives of CTSs, 4-O-alpha-D-glucopyranosyl-CTS and 3-O-alpha-isomaltosyl-CTS. 相似文献
47.
Ifeanyi A. Anyanwu Yasuhiro Gokan Atsuya Suzuki Shigeharu Kamado Yo Kojima Suguru Takeda Taketoshi Ishida 《Materials Science and Engineering: A》2004,380(1-2):93-99
Mg–Zn–Al–Ca–RE alloys have been found to be promising materials for substituting aluminum alloys used for automatic transmission case applications in the automobile industry. Particularly, Mg–0.5%Zn–6%Al–1%Ca–3%RE (ZAXE05613) alloy exhibits comparable creep resistance as ADC12 die-casting aluminum alloy that is currently used for automatic transmission case applications. Changing the rare earth (RE) content of the alloy from mischmetal to lanthanum gives a further improvement in the creep properties of the alloy. Lanthanum addition results in the crystallization of a large amount of acicular Al11RE3 (Al11La3) compound along the grain boundaries as well as across the grain boundaries and this effectively controls grain boundary sliding and dislocation motion in the vicinity of the grain boundaries. As a result, die-cast ZAXLa05613 alloy exhibits a higher creep resistance than that of ZAXE05613 alloy. 相似文献
48.
Tomoyuki Murakami Tetsuya Suekane Kiyoshi Tsuji Yoshihiro Okuno Yasuo Hasegawa Shigeharu Kabashima 《Electrical Engineering in Japan》1997,120(1):16-22
Electron temperatures of nonequilibrium cesium seeded argon plasmas in a disk MHD generator installed in a blow-down facility are measured spectroscopically, and the generator performance is discussed in relation to the electron temperature. The temperature is decreased from ∼9000 K to ∼3000 K when the seed fraction is increased from 1 × 10−4 to 3 × 10−4. For the seed fraction of about 2 × 10−4 corresponding to the maximum power output, the temperature is found to be 4000–5000 K and the temperature fluctuation becomes minimal. For the seed fraction around 2 × 10−4, the electrical conductivity evaluated from the temperature is almost independent of the temperature. These facts suggest that the plasma is almost in the full seed ionization regime. Partially ionized argon and cesium plasmas are dominant at seed fractions below 1.3 × 10−4 and over 2.3 × 10−4, respectively, which degrades generator performance. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 120(1): 16–22, 1997 相似文献
49.
Takahiro Murakami Hiromichi Kobayashi Yoshihiro Okuno Shigeharu Kabashima 《Electrical Engineering in Japan》1999,126(4):48-54
The influence of azimuthal non‐uniformity of the seed fraction on plasma structure and performance in a non‐equilibrium disk MHD generator is investigated with a two dimensional r–θ numerical simulation. It is found that a locally high seed fraction causes mainly non‐uniformity of gas‐dynamical properties, whereas a locally low seed fraction develops a non‐uniform plasma. Both locally high and low seed fractions reduce generator performance considerably. These results suggest a spatially uniform seed fraction should be required for high power generation. ©1999 Scripta Technica, Electr Eng Jpn, 126(4): 48–54, 1999 相似文献
50.
Hideaki Itoh Toshiya Uemura Hirofumi Yamaguchi Shigeharu Naka 《Journal of Materials Science》1989,24(10):3549-3552
Epitaxial (Ni, Zn)Fe2O4 films were prepared on (100) MgO single crystal substrate by lowpressure chemical vapour deposition using a thermal decomposition
of acetylacetonatocomplexes, Ni(acac)2, Zn(acac)2 and Fe(acac)3. These complexes were evaporated at 157, 79 and 146° C, respectively, and transported with nitrogen carrier gas (flow rate
100 ml min−1) to the deposition furnace. Polycrystalline and epitaxial films were grown at 500 to 600 and 600 to 650° C, respectively,
under a pressure of 12 torr. The epitaxial film of Ni1−xZnxFe2O4 (x⋍0.4) treated at 600° C for 60 min, showed the saturation magnetization of 67 e.m.u. g−1 and the coercive force of 20 to 30 Oe. 相似文献