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991.
Hydrogen atom adsorption and diffusion properties on clean and vacancy defective Mg (0001) surface have been investigated
systematically by using a first-principles calculations method based on the density functional theory. The calculation results
of adsorption energy and diffusion energy barrier show that hydrogen atom is apt to be adsorbed at fcc and hcp sites on clean
Mg (0001) surface, and fcc adsorption site is found to be more preferred. The highest diffusion energy barrier is estimated
as 0.6784 eV for the diffusion of hydrogen from clean Mg (0001) surface into its bulk. Surface effects, which affect hydrogen
diffusion obviously, results in a slow diffusion velocity of hydrogen from surface to subsurface, while a fast one from subsurface
to bulk, indicating the range of surface effects is only restricted within two topmost layers of Mg (0001) surface. Comparatively,
Mg atom vacancy on Mg (0001) surface not only enhances the chemisorption interaction between H and Mg surface, but also benefits
H atom diffusion in Mg bulk with relatively more diffusion paths compared with that of clean surface. Besides, hydrogen atom
is found to occupy mostly the tetrahedral interstice when it diffuses into the Mg bulk. Further analysis of the density of
states (DOS) shows that the system for hydrogen atom to be adsorbed at fcc site has a lower DOS value (N (E
F)) at Fermi level and more bonding electrons at the energy range blow the Fermi level of H/Mg (0001) system as compared with
that at hcp site. On the other hand, the enhanced chemisorption interaction between hydrogen and defective surface should
be attributed to the fact that the electronic structures of Mg (0001) surface are modified by an Mg vacancy, and the bonding
electrons of the topmost layer Mg atoms are transferred from low energy range to Fermi level, which is in favor of improving
the surface activity of Mg (0001) surface.
Supported by the PhD Programs Foundation of Ministry of Education of China (Grant No. 200805321032), the Science and Technology
Program Project of Hunan Province (Grant No. 2008GK3083) and the Program for Changjiang Scholars and the Innovative Research
Team in university (Grant No. 531105050037) 相似文献
992.
Liang Wang XiaoShuang Chen Wei Lu Yan Huang XiaoFang Wang JiJun Zhao 《中国科学E辑(英文版)》2009,52(7):1928-1932
The structural and optical properties of amorphous semiconductor mercury cadmium telluride (a-MCT) are obtained by the first
principles calculations. The total pair distribution functions and the density of states show that the a-MCT has the semiconductor
characteristic. The calculated results of dielectric function show that E
2 peak of the imaginary of dielectric function for the crystal mercury cadmium telluride abruptly disappears in the amorphous
case due to the long-range disorders. And the imaginary of dielectric function of a-MCT shows a large broad peak, which is
in agreement with the available results of other amorphous semiconductors. From the linear extrapolation of the curve ħωɛ
2(ω)1/2 versus ħω, it can be obtained that the optical energy gap of amorphous semiconductor Hg0.5Cd0.5Te is 0.51±0.05 eV.
Supported by the National Basic Research Program of China (“973” Project) (Grant No. 2007CB613205), the National Natural Science
Foundation of China (Grant Nos.10725418, 10734090, 60576068), the Key Fund of Shanghai Science and Technology Foundation (Grant
No. 08JC1421100) and the Knowledge Innovation Program of the Chinese Academy of Sciences 相似文献
993.
Separation of nanocolloids driven by dielectrophoresis: A molecular dynamics simulation 总被引:1,自引:0,他引:1
The nonequilibrium molecular dynamics (MD) method was used to model the nanocolloids and the solvent particles. By introducing
a non-uniform electric field, colloids were polarized to have opposite polarities. Separation of colloids driven by dielectrophoresis
(DEP) could be seen clearly under a strong electric field at low temperatures. Analyzing the ratio of DEP velocities of colloids
to thermal velocities of neutral solvent particles showed that when the ratio was correspondingly big, collision between colloids
and solvent particles would be intense, making the DEP velocity of colloids fluctuate frequently. By changing the electric
field strength, it was found that the enhancement of electric field strength would quicken the separation of colloids. But
when the electric field strength increased to a certain degree, the separation motion would be slow because of the strong
friction resistance of the solvent particles to the colloids. Moreover, studying the separation reason of colloids based on
the potential energy showed that after colloids were polarized, the attractive potential energy among the colloids would be
weaker than before, while the increase of temperature would reduce the attractive potential energy and increase the repulsive
potential energy, which accorded with the DLVO theory.
Supported by the National Hi-Tech Research and Derelopment Program of China (“863” Project) (Grant No. 2006AA04Z351) and the
National Natural Science Foundation of China (Grant Nos. 50675033, 30770553) 相似文献
994.
Tao Zhang JunHong Jin DaYong Hu ShengLin Yang Guang Li JianMing Jiang 《中国科学E辑(英文版)》2009,52(4):906-909
The effect of coagulation temperature on the morphology, microstructures and mechanical properties of dihydroxy poly(p-phenylene benzobisoxazole) (DHPBO) fibers was investigated during dry-jet wet-spinning process, in which the coagulation
bath concentration and drawn ratio were kept as 10 wt% of PPA in water and 1.7, respectively. The structures and mechanical
properties of the as-spun DHPBO fibers were characterized by FTIR, XRD, SEM, and single fiber tensile testing. The results
indicated that in PPA/H2O coagulation system, when the coagulation temperature was 25°C, highly crystallized DHPBO as-spun fibers possessing fine
crystallites, circular and smooth morphology, and excellent mechanical properties could be achieved.
Supported by the National Natural Science Foundation of China (Grant No. 50673017), Shanghai Leading Academic Discipline Project
(Grant No. B603) and the Program of Introducing Taleuts of Discipline to University of People’s Republic of China (“111” Program)
(Grant No. 111-2-04) 相似文献
995.
GUAN Ping LIU ChangChun & Lü HeXiang College of Architectural Engineering Dalian University Dalian China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 《中国科学E辑(英文版)》2009,52(5):1248-1253
The traditional unified viscoplasticity constitutive model can be only applied to metal materials. The study of the unified
constitutive theory for metal materials has discovered the correlation between the classical plasticity theory and the unified
viscoplasticity constitutive model, thus leading to the concepts of the classic plastic potential and yield surface in the
unified constitutive model. Moreover, this research has given the continuous expression of the classical plastic multiplier
and presented the corresponding constructive method, which extends its physical significance and lays down a good foundation
for the application of the unified constitutive theory to the material analysis in more fields. This paper also introduces
the unified constitutive model for metal materials and geo-materials. The numerical simulation indicates that the construction
should be both reasonable and practical.
Supported by the National Natural Science Foundation of China (Grant No. 90410012) 相似文献
996.
A neural network model with high nonlinear recognition capability was constructed to describe the relationship between the deformation impact factors and the deformation results of vascular stent.Then,using the weighted correction method with the attached momentum term,the network training algorithm was optimized by introducing learning factor η and momentum factor ψ,so the speed of the network training and the system robustness were enhanced.The network was trained by some practi-cal cases,and the statisti... 相似文献
997.
WeiWei Ji Ning Cai Ying Zhao XiaoDan Zhang Jian Sun ChangChun Wei CunDa Yuan Yuan Li Yan Su ShaoZhen Xiong 《中国科学E辑(英文版)》2009,52(7):1923-1927
A new type counter electrode for dye-sensitized solar cells (DSCs) was proposed which consists of substrate, aluminum film
and platinum film. The new type counter electrode can obviously improve the photoelectric conversion efficiency of DSCs from
3.46% to 7.07% under the standard AM1.5 irradiation condition. Advantages and shortcomings of this new type counter electrode
in terms of electrical properties, optical properties and anti-corrosive properties were analyzed. As a result, some improvements
were proposed.
Supported by the Key Foundation for Fundamental Research of Tianjin Municipal Science & Technology Commission in China ( Grant
No. 06YFJZJC01700) and the National Basic Research Program of China (“973“ Project) (Grant Nos. 2006CB20260, 2006CB202603) 相似文献
998.
In multistage machining processes(MMPs),the final quality of a part is influenced by a series of machining processes,which are complex correlations.So it is necessary to research the rule of machin-ing error propagation to ensure the machining quality.For this issue,a change management method of quality control nodes(i.e.,QC-nodes) for machining error propagation is proposed.A new framework of QC-nodes is proposed including association analysis of quality attributes,quality closed-loop control,error tracing... 相似文献
999.
Equilibrium equations for nonlinear buckling analysis of drill-strings in 3D curved well-bores 总被引:1,自引:0,他引:1
With the development of drilling technology, the oil/gas well has evolved from its early vertical straight form to the inclined, horizontal, plane curved, or even 3D curved well-bore. Understanding of the buck-ling behavior of a drill-string in a well-bore is crucial for the success of a drilling operation. Therefore, equilibrium equations for analyzing the buckling behavior of a drill-string in a 3D curved well-bore are required. Based on Love’s equilibrium equations for a curved and twisted rod in space, ... 相似文献
1000.
The overall behavior of concrete depends on its meso structures such as aggregate shape, interface status, and mortar matrix
property. The two key meso structure characters of concrete, bond status of interface and nonlinear property of matrix, are
considered in focus. The variational structure principle is adopted to establish the macro-meso constitutive law of concrete.
Specially, a linear reference composite material is selected to make its effective behavior approach the nonlinear overall
behavior of concrete. And the overall property of linear reference composite can be estimated by classical estimation method
such as self-consistent estimates method and Mori-Tanaka method. This variational structure method involves an optimum problem
ultimately. Finally, the macro-meso constitutive law of concrete is established by optimizing the shear modulus of matrix
of the linear reference composite. By analyzing the constitutive relation of concrete established, we find that the brittleness
of concrete stems from the imperfect interface and the shear dilation property of concrete comes from the micro holes contained
in concrete.
Supported by the National Natural Science Foundation of China (Grant Nos. 50679022, 90510017, 50539090) and National Basic
Research Program of China (Grant No. 2007CB714104) 相似文献