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201.
Koji Nakano Isamu Moriguchi Naotoshi Nakashima Makoto Takagi 《Journal of Materials Science》1992,27(7):1933-1936
A bilayer-forming synthetic lipid containing a chiral centre and a chromophoric group was investigated as a spectroscopic transducer, based on its enhanced circular dichroism (CD). The CD intensity of chiral bilayers was reduced with addition of alcohol. For ten additives tested, a linear correlation was observed between the CD spectral response to the alcohols and their partition coefficient (logP) in octanol/water system. By use of an immobilization technique, the bilayer film was obtained on a quartz plate, and a possible application as a solid-phase assay of methanol was demonstrated. 相似文献
202.
Thermal properties of polyethylenes prepared by γ-ray-induced polymerization in various solvents were examined by differential scanning calorimetry. The solvents used were ethyl and n-butyl alcohols, tert-butyl alcohol containing 25 vol% of water, 2,2,4-trimethylpentane, 2,2,5-trimethylhexane, and cyclohexane. The dependence of the profiles of the heating curves for the produced polymers on polymerization temperature varies with the solvent type. This difference was discussed in terms of the degree of undercooling in various solvents during polymerization. In all solvent systems, the melting point and heat of fusion of the polymers decrease continuously with polymerization temperature. This decrease is caused by an increase in branches with reaction temperature. The melting point and heat of fusion are 100–124°C and 30–44 cal/g, respectively, and no superheating is observed. These facts suggest that folded chain crystals are commonly formed in these systems. 相似文献
203.
The changes of mechanical properties of chloroprene rubber, used as a jacket material for electric cables in nuclear power generating stations, were investigated under various deterioration environments. The heat resistant properties of the rubber material were measured at various temperatures using a stress relaxation method. From the view point of stress-strain behaviour and chemorheology, the addition of antioxidant and/or antirad reagent to the rubber improves the resistance to heat and/or radiation, respectively. The effects of dose-rate and surrounding atmosphere on the mechanical properties of rubber under radiation were also studied. The radiation damage of rubber was accelerated remarkably under a pressure of 90 atm of air. A vibration fatigue test under heat and radiation was also performed. 相似文献
204.
Shih-Kang Lin Yuhi Yorikado Junxiang Jiang Keun-Soo Kim Katsuaki Suganuma Sinn-Wen Chen Masanobu Tsujimoto Isamu Yanada 《Journal of Electronic Materials》2007,36(12):1732-1734
The development of the microstructure of mechanical-deformation-induced Sn whiskers on electroplated films has been examined
using a focused ion beam system (FIB). The 6-μm-thick matte Sn films were compressed by using a ZrO2 ball indenter under ambient conditions. After compression, tin whiskers and small nodules were found adjacent to, and several
grains further away from, the indents. The cross-sectional microstructures of the indents and whiskers indicate that the lateral
boundaries of the newly created grains caused by recrystallization are the main routes for stress relaxation. 相似文献
205.
Kamiyama S. Iida K. Kawashima T. Kasugai H. Mishima S. Honshio A. Miyake Y. Iwaya M. Amano H. Akasaki I. 《IEEE journal of selected topics in quantum electronics》2005,11(5):1069-1073
We have demonstrated a UV-laser diode with a lasing wavelength of 350.9 nm, which has a GaN-AlGaN multiquantum-well (MQW) active layer and was grown on low-dislocation-density Al/sub 0.18/Ga/sub 0.82/N template. The Al/sub 0.18/Ga/sub 0.82/N template was produced by the hetero-epitaxial lateral overgrowth technology on the low-cost sapphire substrate, and has partially low-dislocation density of approximately 2/spl times/10/sup 7/ cm/sup -2/. The lasing operation under pulsed current injection was achieved with the threshold current density of 7.3 kA/cm/sup 2/ and the operating voltage of 10.4 V. 相似文献
206.
The unit commitment problem consists of determining the schedules for power generating units and the generating level of each unit. The decisions concern which units to commit during each time period and at what level to generate power to meet the electricity demand. The problem is a typical scheduling problem in an electric power system. The electric power industry is undergoing restructuring and deregulation. This article developes a stochastic programming model which incorporates power trading. The uncertainty of electric power demand or electricity price are incorporated into the unit commitment problem. It is assumed that demand and price uncertainty can be represented by a scenario tree. A stochastic integer programming model is proposed in which the objective is to maximize expected profits. In this model, on/off decisions for each generator are made in the first stage. The approach to solving the problem is based on Lagrangian relaxation and dynamic programming. 相似文献
207.
Dong Yong Park Shi W. Lee Seong Jin Park Young-Sam Kwon Isamu Otsuka 《Metallurgical and Materials Transactions A》2013,44(3):1508-1518
In rapidly evolving powder injection molding technology, the wide prevalence of various microstructures demands the powders of smaller particle sizes. The effects of particle size on the sintering behavior are critical to not only shape retention of microstructure but also its mechanical properties. This study investigates the effects of three different particle sizes on the sintering behavior of the 316L stainless steel (STS316L) samples, prepared by powder injection molding, via the dilatometry experiments. For this purpose, the STS316L powders of three different mean particle sizes, i.e., 2.97, 4.16, and 8.04 μm, were produced for STS316L. The samples for the dilatometry test were prepared through powder-binder mixing, injection molding, and solvent and thermal debinding. Dilatometry experiments were carried out with the samples in a H2 atmosphere at three different heating rates of 3, 6, and 10 K/min. The shrinkage data obtained by dilatometry experiments was collected and analyzed to help understand the densification and the sintering behaviors in terms of particles size and heating rate. The master sintering curve (MSC) model was used to quantify the effects of particle sizes. In addition, we investigated the microstructure evolutions in terms of particles sizes. 相似文献
208.
Isamu Sato Koji Maeda Mitsuo Suto Masahiko Osaka Toshiyuki Usuki Shin-ichi Koyama 《Journal of Nuclear Science and Technology》2013,50(4):580-587
Penetration behavior of radionuclides such as 137Cs into dried concrete material, dried mortar material and epoxy paint for a few dozen days was observed using a solution containing fission products extracted from irradiated fuels to obtain fundamental information on the radionuclide penetration rate and depth. Hardly any radionuclides could penetrate into the epoxy paint. The radionuclide solution penetrated into concrete and mortar materials to a depth of a few millimeters for a few dozen days. The penetration behavior observed near the surface of concrete and mortar materials was similar to the diffusion of nuclides in media such as water-saturated concrete, bentonite and cement materials. 相似文献
209.
A novel polymer dispersant with a tri-block structure was designed. The tri-block polymer was composed of polyglycerin (PGL) with two dimethylpolysiloxane chains (DMPS) at both ends of the molecular structure. The high dispersibility of the dispersant was confirmed in both a model silica system and a sunscreen formulation. The apparent silica particle size was employed as an index for the dispensability for the dispersants. The novel dispersant showed 5 times more effective than conventional one. The flow properties of a sunscreen formulation containing titanium dioxide with the novel dispersant was Newtonian, indicating that the dispersibility of the dispersant was excellent. On the other hand, the formulation with conventional dispersant showed shear-thinning flow due to aggregation of the powder. These results mean that such a tri-block copolymer would make it possible to develop consumer demanded sunscreens. 相似文献
210.
Satoshi Kamiyam Motoaki Iway Tetsuya Takeuchi Isamu Akasaki Mikael Syvjrvi Rositza Yakimova 《半导体学报》2011,32(1):013004-3
Fluorescent-SiC (f-SiC), which contains donor and acceptor impurities with optimum concentrations, has high conversion efficiency from NUV to visible light caused by donor-acceptor-pair (DAP) recombination. This material can be used as a substrate for a near UV light-emitting diode (LED) stack, and leads to monolithic white LED device with suitable spectral property for general lighting applications. In this paper, we describe basic technologies of the white LED, such as optical properties of f-SiC substrate, and epitaxial growth of NUV stack on the f-SiC substrate. 相似文献