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151.
We address the problem of automated action selection policy synthesis for unmanned vehicles operating in adverse environments.
We introduce a new evolutionary computation-based approach using which an initial version of the policy is automatically generated
and then gradually refined by detecting and fixing its shortcomings. The synthesis technique consists of the automated extraction
of the vehicle’s exception states and Genetic Programming (GP) for automated composition and optimization of corrective sequences
of commands in the form of macro-actions to be applied locally. 相似文献
152.
This paper presents a new algorithm for extracting Free-Form Surface Features (FFSFs) from a surface model. The extraction algorithm is based on a modified taxonomy of FFSFs from that proposed in the literature. A new classification scheme has been proposed for FFSFs to enable their representation and extraction. The paper proposes a separating curve as a signature of FFSFs in a surface model. FFSFs are classified based on the characteristics of the separating curve (number and type) and the influence region (the region enclosed by the separating curve). A method to extract these entities is presented. The algorithm has been implemented and tested for various free-form surface features on different types of free-form surfaces (base surfaces) and is found to correctly identify and represent the features irrespective of the type of underlying surface. The representation and extraction algorithm are both based on topology and geometry. The algorithm is data-driven and does not use any pre-defined templates. The definition presented for a feature is unambiguous and application independent. The proposed classification of FFSFs can be used to develop an ontology to determine semantic equivalences for the feature to be exchanged, mapped and used across PLM applications. 相似文献
153.
G. Morell A. González-Berríos B. R. Weiner S. Gupta 《Journal of Materials Science: Materials in Electronics》2006,17(6):443-451
The synthesis and properties of sulfur-doped nanocrystalline diamond films were investigated. The films were deposited by
hot-filament chemical vapor deposition on Mo substrates using methane, hydrogen, and hydrogen disulfide. The nanocrystalline
nature of the material arises from the induction of continuous secondary nucleation in the chemical vapor deposition environment.
Complementary characterization tools were employed in order to obtain a comprehensive and coherent understanding of the correlations
between the structural and electronic properties. In particular, sulfur-doped nanocrystalline diamond films show n-type Hall
conductivity, enhanced field emission properties, and insensitivity to ion radiation. It was found that n-type doping of the
tetragonally-bonded carbon matrix together with a nano network of trigonally-bonded carbon are crucial elements for enhanced
field emission from nanocrystalline diamond. These conclusions and the corresponding supporting evidence are discussed. 相似文献
154.
Dielectric properties, ac conductivity and thermal behaviour of flux grown cadmium titanate crystals
Vineeta Gupta K.K. Bamzai P.N. Kotru B.M. Wanklyn 《Materials Science and Engineering: B》2006,130(1-3):163-172
The dependence of loss tangent (tan δ) and both real and imaginary parts of the dielectric constant (′ and ″) on temperature in the range 298–923 K and frequency in the range 103–106 Hz for flux grown CdTiO3 single crystals is reported. The ln σac versus T plots suggest the conduction mechanism to be ionic hopping conduction. From ln σac versus frequency curves, it can be seen that the slope decreases with the rise in temperature, suggesting that the ionic hopping conduction diminishes with the rise in temperature. The activation energy at various fixed frequencies is calculated from the slope of the graph between ln σac versus 1/T (×103 K−1). Thermal behaviour of flux grown CdTiO3 crystals using thermoanalytical techniques including TG, DTA and DTG is discussed. Thermal analysis suggests decomposition of CdTiO3 in the temperature interval of 1386–1693 K leading to the formation of TiO2 as the final product. Results obtained on application of TG based models viz. Horowitz–Metzger, Coats–Redfern and Piloyan–Novikova are reported. The results of kinetics of thermal decomposition suggest contracting cylinder model as the one that is relevant to the decomposition of CdTiO3. The kinetic parameters viz. the order of reaction, activation energy, frequency factor, and entropy of activation using the above mentioned models are computed. 相似文献
155.
L. J. Dhareshwar S. Chaurasia C. G. Murali N. K. Gupta B. K. Godwal 《Journal of Materials Science》2006,41(5):1623-1630
X-ray and ion emissions from high temperature plasmas from solid targets with different atomic numbers have been studied.
Plasma is generated using a high power Nd:Glass laser generating focused intensity in the range of 1012 to 1013 Watts/cm2 on targets. Plasma temperature is typically between 50 to 100 eV. X-ray emission scaling as a function of laser intensity
as well as ion velocity has been measured in these targets. Non-uniform plasma expansion and generation of fast ions are observed
for targets with higher atomic numbers. 相似文献
156.
Algebraic immunity for cryptographically significant Boolean functions: analysis and construction 总被引:13,自引:0,他引:13
Carlet C. Dalai D.K. Gupta K.C. Maitra S. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2006,52(7):3105-3121
Recently, algebraic attacks have received a lot of attention in the cryptographic literature. It has been observed that a Boolean function f used as a cryptographic primitive, and interpreted as a multivariate polynomial over F/sub 2/, should not have low degree multiples obtained by multiplication with low degree nonzero functions. In this paper, we show that a Boolean function having low nonlinearity is (also) weak against algebraic attacks, and we extend this result to higher order nonlinearities. Next, we present enumeration results on linearly independent annihilators. We also study certain classes of highly nonlinear resilient Boolean functions for their algebraic immunity. We identify that functions having low-degree subfunctions are weak in terms of algebraic immunity, and we analyze some existing constructions from this viewpoint. Further, we present a construction method to generate Boolean functions on n variables with highest possible algebraic immunity /spl lceil/n/2/spl rceil/ (this construction, first presented at the 2005 Workshop on Fast Software Encryption (FSE 2005), has been the first one producing such functions). These functions are obtained through a doubly indexed recursive relation. We calculate their Hamming weights and deduce their nonlinearities; we show that they have very high algebraic degrees. We express them as the sums of two functions which can be obtained from simple symmetric functions by a transformation which can be implemented with an algorithm whose complexity is linear in the number of variables. We deduce a very fast way of computing the output to these functions, given their input. 相似文献
157.
158.
Soil-cement blocks also known as compressed earth blocks or stabilised mud blocks are used for load bearing masonry. The paper focuses on the study of various characteristics of soil-cement blocks using highly sandy soils through an experimental investigation. Characteristics of soilcement blocks having three different cement contents (6%, 8% and 12%) have been examined. Paper reports results of influence of cement content on compressive strength, tensile strength, the initial rate of absorption (IRA), water absorption, rate of water absorption, surface porosity and pore size, stress-strain relationships and elastic properties of soil-cement blocks. The results indicate that there is 2.5 times increase in strength for doubling of cement content from 6%. IRA decreases drastically with the increase in cement content of the block. Saturated water content of the blocks is not sensitive to cement content, whereas rate of moisture absorption greatly depends on the cement content. Pore size decreases with increase in cement content of block, whereas surface porosity is independent of the cement content. Soil-cement block modulus varies between 2000 and 6000MPa. Elastic modulus increases by 2.5 times when the cement content is increased from 6 to 8%, whereas the increase in modulus is marginal when cement content goes from 8 to 12%. 相似文献
159.
Gautam Gupta Ali Zbib Ahmed El-Ghannam Marwan Khraisheh Hussein Zbib 《Composite Structures》2005,71(3-4):423-428
A novel bioactive, porous silica–calcium phosphate nanocomposite (SCPC) that can be used to treat large bone defects in load-bearing positions has been tested and has shown great potential for applications in tissue engineering. Porosity is essential to the performance of the composite material as a tissue engineering scaffold, as porous scaffolds provide a physical, 3-D template to support new tissue formation. However, porosity characterization using conventional techniques such as porosimetry or scanning electron microscopy requires extensive preparation of samples and may destroy important features during preparation and analysis stage. In this work, the new composite is characterized using an advanced high resolution X-ray computed tomography, which is a non-destructive testing technique that allows construction of the 3-D topology of the microstructure. The results clearly show the effectiveness and versatility of this technique in characterizing the porous architecture of the novel composite biomaterial. The pore distribution, morphology and interconnectivity in the composite scaffolds were found to be ideal for use in tissue engineering applications. 相似文献
160.
A comparative dielectric relaxation study of PMN–PT and PMN–PZ ceramics using impedance spectroscopy
Surya M. Gupta Pragya Pandit Pankaj Patro Ajit R. Kulkarni Vinod K. Wadhawan 《Materials Science and Engineering: B》2005,120(1-3):194-198
AC-impedance spectroscopic studies in the temperature range of 30–400 °C are carried out on solid solutions of lead magnesium niobate (PMN) with lead titanate (PT) and lead zirconate (PZ), both of them in the 65/35 atomic ratio. For PMN–PT this corresponds to the morphotropic phase boundary composition (with normal ferroelectric behaviour), and for PMN–PZ it is near the phase boundary between normal ferroelectric and relaxor ferroelectric compositions. The variation of dielectric permittivity with temperature at different frequencies shows normal ferroelectric and relaxor-like dependence for PMN–PT and PMN–PZ, respectively. Temperature-dependent spectroscopic modulus plots reveal a much broader peak for PMN–PZ compared to that for PMN–PT, which is consistent with the dielectric behaviour. PMN–PT shows nearly ideal Debye behaviour below Tm (the temperature of the permittivity maximum) and the behaviour departs from ideality above Tm, whereas non-ideal Debye behaviour is seen both below and above Tm for PMN–PZ. Complex modulus plots fit well with two depressed semicircles and three depressed semicircles, respectively, for PMN–PT and PMN–PZ. The relaxation observed in the spectroscopic plots around 1 MHz for PMN–PT has been assigned to polarisation relaxation expected for normal-sized domains. No such relaxation could be observed for PMN–PZ around 1 MHz because of the mesoscopic domain sizes. 相似文献