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991.
Air flow through a solar-cum-wind aspirator is induced by both thermal buoyancy and wind effects. A similitude study has been conducted to characterize air flow rates through solar-cum-wind aspirators. A relationship between the air flow rate and height and diameter of the aspirator, wind speed, temperature rise inside the stack, and relevant air properties has been developed on the basis of the experimental data collected under field conditions. 相似文献
992.
This paper deals with cost analysis of a single server two-unit (one priority and the other ordinary) cold standby system with two modes—normal and total failure. A switch is used to operate the standby unit (ordinary) and it works successfully with known probability p( = 1 ? q). Priority unit gets preference both for operation and repair. Failure and repair time distributions are arbitrary. System fails when switch or both the units fail totally. The system is observed at suitable regenerative epochs in order to obtain reliability characteristics of interest to system designers and operations managers. Explicit results for the exponential time distributions have been obtained in particular cases. 相似文献
993.
A simple concentric cylinder model is developed for the fibre push-out test in order to interpret the experimentally observed indenter load-displacement curves in ceramic-matrix composites. The fibre-matrix interface is assumed to be partially bonded and partially frictionally coupled. It is shown that a slope change in the loading curve corresponds to bonding at the fibre-matrix interface. In contrast an insignificant change in the slope is predicted for composites in which the fibre-matrix interface is frictionally coupled. This model also provides a framework for determining the interfacial debond energy and the interfacial shear strength in ceramic composites using the fibre push-out tests. The predictions of this model are compared with the push-out test results performed on zircon-SiC composites uniaxially reinforced with either uncoated or BN-coated SiC monofilaments, which suggested that the fibre-matrix interfaces in both of these composites are frictionally coupled. 相似文献
994.
Background
The ability to reduce inflammation in overweight and obese individuals may be valuable in preventing the progression to metabolic syndrome with associated risks for heart disease and diabetes. The purpose of this study was to evaluate the effect of multiple dosages of a proprietary Mangosteen Juice blend on indicators of inflammation and antioxidant levels in obese patients with elevated C-reactive protein (CRP) levels. 相似文献995.
We investigated the mobility and distribution of cadmium (Cd), nickel (Ni) and zinc (Zn) in four contaminated soil profiles
from Bangladesh. The sources of contamination of these profiles were tannery wastes, city sewage and the wastes of pharmaceutical
and paper mill factories at different locations in Bangladesh. The samples were collected from the A-, B- and C-horizons of
each profile: two sub-samples from the A-horizon at depths of 0–5 cm (A1) and >5 cm (A2), and one sample each from the B-
and C-horizons. Soil samples were analysed for total metal content by dissolution in aqua regia followed by sequential extraction
of the fractions based on their varying solubility. There were six operationally defined groups of extraction sequences: water
soluble (F1), exchangeable (F2), carbonate (F3), oxide (F4), organic (F5) and residual (F6). The total concentration of Cd,
Ni and Zn in the A-horizon (0–5 cm) ranged from 0.10 to 0.62, from 31 to 54 and from 85 to 838 mg kg−1, respectively. In the B- and C-horizons, the concentrations of these metals decreased many fold, particularly in the city
sewage profile where the decrease for Cd and Zn was approximately fourfold. The distribution of metals among the chemical
fractions depended on their total concentrations. In the A1-horizon, Cd had the highest mobility factor [MF = (F1+F2+F3)/(F1+F2+F3+F4+F5+F6) × 100]
at 41–43% and Ni had the lowest at 3–13%, while Zn, showed intermediate values at 8–25%. The MF decreased with depth in all
soil profiles. Among the fractions, the residual fraction contained the lowest levels of Cd but the highest levels of Ni and
Zn. This state affected their relative mobility and distribution in soil profiles. Of the soil profiles, the mobility of all
metals was higher in the city sewage soil than in any of the other three soils investigated, suggesting that the former may
create a health risk by contaminating agricultural products and ground water as it also contained higher amounts of Cd and
Zn. 相似文献
996.
Virpal Singh V. N. Singh Ashok Mittal 《Journal of Infrared, Millimeter and Terahertz Waves》2000,21(3):421-428
This paper describes the Integrated Finline Front-end Radar Receivers at Ka-Band. The Front-receivers developed for Radar applications include combining of finline components on a single MIC substrate with various planar transmission lines. The integrated systems so developed have better noise figure and control over phase and gain imbalances as compared to discrete component systems. Two types of Integrated Front-ends Radar receivers are described here. The developed systems are highly compact and reliable. 相似文献
997.
Acrylamide based hydrogel particles with variable charge were synthesized in different sizes using a biocompatible surfactant. We use microemulsion polymerization to synthesize the hydrogel particles in lecithin organogel systems. The phospholipid, lecithin, is a soybean extract that exhibits a rich phase behavior depending on various factors such as amount of water, co-solvent, additives and their concentrations. By UV irradiation of water-in-oil microemulsions of lecithin, containing different monomers, phospholipid coated hydrogels were synthesized in situ. The hydrogel particle size varies from a few hundred nanometers to tens of micrometer. The response time of these micron sized hydrogel particles, as measured by swelling experiments, is very fast (∼100 s) in comparison with their corresponding bulk hydrogels (∼101 h). The positively charged cationic hydrogel microparticles were embedded/dispersed into another hydrogel matrix to render responsive behavior to a non-responsive matrix. Besides TEM and SEM studies, fluorescein dye absorption studies were also performed in order to visualize the hydrogel microparticles. Additionally, anionic hydrogel micro/nano-particles were also synthesized in the lecithin system. 相似文献
998.
Abhinav Kumar Rajendra Prasad G. Kociok-Köhn Kieran C. Molloy Nanhai Singh 《Inorganic chemistry communications》2009,12(7):686-690
Title compound[(n-Bu)2Sn-μ-O-μ-OH-Sn(n-Bu)2(CH3CO2)]2 was obtained accidentally by the reaction of n-Bu2SnCl2 with the metalloligand K2[Ni(CDC)2] in ethanol - water mixture while synthesizing a heterobimetallic complex [n-Bu2Sn Ni(CDC)2]. This has been characterized by micro analysis, UV–Vis, 1H, 13C and 119Sn NMR spectroscopy and the single crystal X-ray. The complex forms an interesting supramolecular architecture via (acetate)O?HO hydrogen bonding interactions which generates hydrophobic “pseudo-cage”. The electronic absorption bands of the title complex were assigned with the help of the time dependent density functional theory (TD-DFT) calculations. Density functional theory (DFT) calculations have been performed at the optimized molecular geometry of some of its putative derivatives e. g. trans p-amino cinnamic acid derivative 2; trans p-amino cinnamic acid and trans p-nitro cinnamic acid derivative 3; trans p-amino cinnamic acid and trans p-(N,N dimethylamino) cinnamic acid derivative 4. The first static hyperpolarizability (β) of the title compound and its derivatives were calculated with double numerical differentiation of total energies. The derivatives 3 and 4 showed three times and five times enhancement in the non-linear optical (NLO) responses than the standard p-nitroaniline (pNA). 相似文献
999.
Neeraj Praphulla Awasthi Rajinder Pal Singh 《European Journal of Lipid Science and Technology》2009,111(2):202-206
The present investigation explores a process for the production of erucamide, utilizing microwave irradiation as the heating element for the reaction between erucic acid and gaseous ammonia liberated by urea in the presence of catalyst (di‐ammonium hydrogen ortho‐phosphate) at atmospheric pressure and high temperature. In this process, the time of reaction is very short (25 min) and the yield is also good (92%). 相似文献
1000.
Nezu Arthur M.; Nezu Christine Maguth; Jain Diwakar 《Canadian Metallurgical Quarterly》2008,27(6):829
Objective: The present study tested the hypothesis that social problem solving (SPS) served to mediate the relationship between preceived stress and noncardiac chest pain (NCCP). Design: Adults undergoing stress myocardial perfusion imaging (MPI) to determine the presence of underlying cardiovascular disease related to the experience of chest pain were recruited prior to stress testing to complete a series of self-report inventories. Main Outcome Measures: MPI results were used to identify individuals with NCCP (N = 166; 91 men, 75 women; mean age = 53.92 years, SD = 11.98). Measures included perceived stress, SPS, and chest pain frequency and intensity. Results: In direct tests of the mediational effects of SPS, it was found that two problem-solving dimensions, negative problem orientation and rational problem solving, each served as significant mediators of the effects of stress on both NCCP intensity and frequency. Conclusion: These results support a mediational analysis of NCCP that includes stress and SPS. As such, it identifies SPS as a potentially important clinical target to consider when developing future psychosocial-based therapy protocols for treating individuals with NCCP. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献