全文获取类型
收费全文 | 13724篇 |
免费 | 1087篇 |
国内免费 | 39篇 |
专业分类
电工技术 | 213篇 |
综合类 | 6篇 |
化学工业 | 3196篇 |
金属工艺 | 508篇 |
机械仪表 | 881篇 |
建筑科学 | 259篇 |
矿业工程 | 2篇 |
能源动力 | 627篇 |
轻工业 | 992篇 |
水利工程 | 55篇 |
石油天然气 | 37篇 |
无线电 | 2676篇 |
一般工业技术 | 3115篇 |
冶金工业 | 848篇 |
原子能技术 | 249篇 |
自动化技术 | 1186篇 |
出版年
2024年 | 10篇 |
2023年 | 157篇 |
2022年 | 238篇 |
2021年 | 416篇 |
2020年 | 346篇 |
2019年 | 344篇 |
2018年 | 439篇 |
2017年 | 516篇 |
2016年 | 544篇 |
2015年 | 424篇 |
2014年 | 639篇 |
2013年 | 930篇 |
2012年 | 945篇 |
2011年 | 1164篇 |
2010年 | 795篇 |
2009年 | 832篇 |
2008年 | 751篇 |
2007年 | 587篇 |
2006年 | 531篇 |
2005年 | 473篇 |
2004年 | 427篇 |
2003年 | 382篇 |
2002年 | 370篇 |
2001年 | 313篇 |
2000年 | 310篇 |
1999年 | 294篇 |
1998年 | 385篇 |
1997年 | 239篇 |
1996年 | 187篇 |
1995年 | 127篇 |
1994年 | 130篇 |
1993年 | 94篇 |
1992年 | 63篇 |
1991年 | 76篇 |
1990年 | 56篇 |
1989年 | 50篇 |
1988年 | 41篇 |
1987年 | 40篇 |
1986年 | 33篇 |
1985年 | 24篇 |
1984年 | 22篇 |
1983年 | 15篇 |
1982年 | 13篇 |
1981年 | 16篇 |
1980年 | 11篇 |
1979年 | 8篇 |
1977年 | 14篇 |
1976年 | 11篇 |
1975年 | 4篇 |
1974年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
This paper considers modeling and simulation of a unified control system that uses a continuous control-theoretic approach for distributed production scheduling at the shop floor and machine capacity control at the CNC level. Specifically, a distributed production scheduling method is unified with a distributed machine capacity control to generate realistic schedules considering the available capacity of production resources. In this distributed control system, machine capacity is adaptively controlled based on current physical conditions of the production resources and changes in production demands at the shop-floor level as well. The proposed system considers a multi-attribute objective that consists of production rate and product quality, production cost, and mean-squared deviation of job completions about due dates. The results obtained from the computational experiments show that the proposed system can improve the system performance through fully utilizing machine capacity while reducing production costs, production delays, missed deliveries, and customer dissatisfaction. 相似文献
993.
Ning Li Sang-Hyun Cho Myoung-Hee Kim 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,262(1):143-152
A computer code was developed to simulate radiograph of complex casting products in a CAVETM-like environment. The simulation is based on the deterministic algorithms and ray tracing techniques. The aim of this study is to examine CAD/CAE/CAM models at the design stage, to optimize the design and inspect predicted defective regions with fast speed, good accuracy and small numerical expense. The present work discusses the algorithms for the radiography simulation of CAD/CAM model and proposes algorithmic solutions adapted from ray-box intersection algorithm and octree data structure specifically for radiographic simulation of CAE model. The stereoscopic visualization of full-size of product in the immersive casting simulation environment as well as the virtual X-ray images of castings provides an effective tool for design and evaluation of foundry processes by engineers and metallurgists. 相似文献
994.
Most of past studies devoted to the creep rupture of a nuclear reactor pressure vessel (RPV) lower head under severe accident conditions, have focused on global deformation and rupture modes. Limited efforts were made on local failure modes associated with penetration nozzles as a part of TMI-2 vessel investigation project (TMI-2 VIP) in 1990s. However, it was based on an excessively simplified shear deformation model. In the present study, the mode of nozzle failure has been investigated using data and nozzle materials from Sandia National Laboratory's lower head failure experiment (SNL-LHF). Crack-like separations were revealed at the nozzle weld metal to RPV interfaces indicating the importance of normal stress component rather than the shear stress in the creep rupture. Creep rupture tests were conducted for nozzle and weld metal materials, respectively, at various temperature and stress levels. Stress distribution in the nozzle region is calculated using elastic–viscoplastic finite element analysis (FEA) using the measured properties. Calculation results are compared with earlier results based on the pure shear model of TMI-2 VIP. It is concluded from both LHF-4 nozzle examination and FEA that normal stress at the nozzle/lower head interface is the dominant driving force for the local failure. From the FEA for the nozzle weld attached in RPV, it is shown that nozzle welds failure occur by displacement controlled fracture of nozzle hole not by load controlled fracture of internal pressure. Considering these characteristics of nozzle weld failure, new concept of nozzle failure time prediction is proposed. 相似文献
995.
Seung-Beom Cho Jun-Seok Noh Sang-Jun Park Dae-Young Lim Sang-Heul Choi 《Journal of Materials Science》2007,42(13):4877-4886
Acicular magnetite (Fe3O4) powders were synthesized through new glycothermal dehydration by using crystalline α-FeOOH as precursor and glycols as solvent.
When ethylene glycol was used as solvent, the phase was in-situ transformed from acicular α-FeOOH to α-Fe2O3 and finally to Fe3O4 at 270 °C for 6 h without morphological change. When water was added as a co-solvent in glycothermal reaction, Fe3O4 powders were synthesized through dissolution–recrystallization process at 230 °C for 3 h. The volume ratio of ethylene glycol
to water (E/W) in the reaction has a strong effect on the morphology of the synthesized Fe3O4 particles. The particle shape of Fe3O4 particles changed from needle to sphere when the water content in E/W volume ratio increased from 0.5 to 1 mL in mixed glycothermal
condition. When the water were added by more than 10 ml, the particle shape of Fe3O4 changed from sphere to octahedron truncated with the {100} faces and finally distinct octahedron with only {111} faces. Also,
it is demonstrated that the size of Fe3O4 particles can be controlled from 1–2 μm to 100–200 nm by varying the reaction conditions such as the volume ratio of water
to ethylene glycol and additive in glycothermal reaction. 相似文献
996.
Nanda Gopal Sahoo Yong Chae Jung Jae Whan Cho 《Materials and Manufacturing Processes》2007,22(4):419-423
We report the electroactive shape memory composites obtained by shape memory polyurethane block copolymer (PU) and multi-walled carbon nanotubes (MWNTs), and polypyrrole (PPy). An addition of combined MWNTs and PPy contributed to an enhancement in conductivity of PU-MWNTs composites. PU containing 2.5% MWNTs showed better mechanical and thermal properties than other composites, but conductivity was not sufficient for showing the shape memory effect by applying electrical voltages. However, when the composite was lightly coated by PPy (2.5%), its conductivity was the highest than other composites. Such the conductivity of this composite was enough to show electroactive shape recovery by heating above transition temperature of 40-48°C due to melting of polycaprolactone soft segment domain. The good shape recovery of 90-96% could be obtained in the shape recovery test when an electric field of 25 V was applied. 相似文献
997.
Robinson Jason D.; Cinciripini Paul M.; Carter Brain L.; Lam Cho Y.; Wetter David W. 《Canadian Metallurgical Quarterly》2007,15(4):390
Negative affect reduction has been postulated to be a key feature of cigarette smoking. In the present study, facial electromyography (EMG), heart rate (HR), and skin conductance response (SCR) were used to evaluate the affective significance of acute nicotine administration and overnight withdrawal. Smokers (N = 115) attended four 90-min laboratory assessment sessions scheduled approximately 3 days apart. The sessions provided a complete crossing of 2 prelaboratory deprivation conditions (12-hr deprived vs. nondeprived) with 2 drug conditions (nicotine vs. placebo nasal spray). During each session, smokers viewed affective slides while facial EMG, HR, and SCR were recorded. Results indicated that for women, nicotine nasal spray resulted in lower corrugator EMG activity during both smoking-deprived and nondeprived sessions, compared with placebo. However, nondeprived women also showed an increase in zygomaticus EMG when given nicotine compared with placebo spray, whereas smoking-deprived women demonstrated a decrease in the zygomaticus response to nicotine compared with placebo. With men, nicotine also appeared to lower corrugator during deprivation, but not nondeprivation, compared with placebo spray, though the contrast only approached significance. With zygomaticus EMG, nicotine spray decreased men's zygomaticus responding during nondeprivation but not during deprivation, compared with placebo spray. The HR results reflected the stimulatory properties of the drug rather than nicotine's affective properties, whereas SCR was unresponsive to our experimental manipulations. The corrugator EMG results support negative reinforcement models of smoking that postulate that acute nicotine use reduces withdrawal-driven negative affect. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
998.
We report an alternative synthesis route for tetragonal and submicron barium titanate particles through a low temperature isothermal heat treatment of a precursor powder obtained from the BaO2-TiO2-C mixture utilizing combustion synthesis technique. Effort has been concentrated on the investigation and optimization of the synthesis process including combustion temperature and velocity, heat treatment procedure, and the characteristics of the powder obtained. It was shown that precursor powder prepared by the combustion method easily transformed to the tetragonal BaTiO3 starting from 700 °C. Characterization of the products was performed by powder X-ray diffraction, scanning electron microscopy (SEM) and BET. From the results, it has been found that the formation of tetragonal BaTiO3 powder at low temperature is conditioned by high chemical activity and specific characteristics of combustion products. The BaTiO3 specimens were found to possess high dielectric constant and low dissipation factor at room temperature. 相似文献
999.
N. N. Il’ichev P. V. Shapkin A. S. Nasibov S. E. Mosaleva 《Inorganic Materials》2007,43(10):1050-1053
Cobalt diffusion into single crystals of the compound semiconductor ZnSe has been studied under the conditions of the S ZnSe-S CoSe-L Zn-V phase equilibrium at temperatures from 700 to 970°C, and the diffusion coefficients of cobalt in (100)-and (111)-oriented single-crystal samples of zinc selenide have been determined as functions of temperature. The diffusion rate of cobalt along the [111] direction is shown to exceed that along [100]. 相似文献
1000.
The SrRuO3 thin films were grown on amorphous fused silica and (100) single crystal LaAlO3 substrates by pulsed laser deposition method. On fused silica substrates, polycrystalline SrRuO3 thin film was obtained and below the crystallization temperature, SrRuO3 thin films show an amorphous phase. For the case of epitaxial growth on (100) single crystal LaAlO3 substrate, the crystallization temperature of SrRuO3 thin film was increased by ∼ 100 °C indicating that additional energy is necessary in order to obtain the epitaxial thin film. By using the eclipse method and the control of substrate temperature, the variations of surface morphologies and grain size were observed by atomic force microscope. Below the crystallization temperature, amorphous SrRuO3 thin film shows hopping transport property of an insulator. 相似文献