全文获取类型
收费全文 | 36097篇 |
免费 | 6492篇 |
国内免费 | 5342篇 |
专业分类
化学 | 26695篇 |
晶体学 | 677篇 |
力学 | 2082篇 |
综合类 | 427篇 |
数学 | 3746篇 |
物理学 | 14304篇 |
出版年
2024年 | 115篇 |
2023年 | 657篇 |
2022年 | 1211篇 |
2021年 | 1306篇 |
2020年 | 1458篇 |
2019年 | 1599篇 |
2018年 | 1301篇 |
2017年 | 1280篇 |
2016年 | 1756篇 |
2015年 | 1897篇 |
2014年 | 2127篇 |
2013年 | 2724篇 |
2012年 | 3427篇 |
2011年 | 3308篇 |
2010年 | 2468篇 |
2009年 | 2508篇 |
2008年 | 2752篇 |
2007年 | 2311篇 |
2006年 | 2273篇 |
2005年 | 1983篇 |
2004年 | 1563篇 |
2003年 | 1197篇 |
2002年 | 1216篇 |
2001年 | 979篇 |
2000年 | 782篇 |
1999年 | 671篇 |
1998年 | 453篇 |
1997年 | 385篇 |
1996年 | 340篇 |
1995年 | 311篇 |
1994年 | 282篇 |
1993年 | 245篇 |
1992年 | 173篇 |
1991年 | 178篇 |
1990年 | 122篇 |
1989年 | 86篇 |
1988年 | 88篇 |
1987年 | 55篇 |
1986年 | 58篇 |
1985年 | 65篇 |
1984年 | 35篇 |
1983年 | 36篇 |
1982年 | 19篇 |
1981年 | 25篇 |
1980年 | 16篇 |
1979年 | 20篇 |
1978年 | 10篇 |
1977年 | 11篇 |
1975年 | 8篇 |
1957年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
A novel compound, [Co(phen)3][V10O26]·H2O, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. This compound crystallizes in the orthorhombic space group Ccca with a=13.447(3), b=29.936(6), c=23.252(5) Å, V=9360(3) Å3, Z=8 and R=0.0285. Data were collected on a Rigaku R-AXIS RAPID IP diffractometer at 293 K in the range of 1.36<θ<24.99°. The structure of the compound consists of vanadium oxide layers, which are built up from the infinite VO4 chains by corners and edges sharing. The [Co(phen)3]2+ complexes occupy the interlayer space and contact each other via π−π stacking interactions of the phen groups to form infinite one-dimensional chains. 相似文献
33.
In this paper, we deal with the nonlinear second-order differential equation with damped vibration term involving p-Laplacian operator. Of particular interest is the resolution of an open problem. An interesting outcome from our result is that we can obtain the fast homoclinic solution with general superlinear growth assumption in suitable Sobolev space. To our knowledge, our theorems appear to be the first such result about damped vibration problem with p-Laplacian operator. 相似文献
34.
Acta Mathematica Sinica, English Series - The main purpose of this article is to study the calculating problem of the sixth power mean of the two-term exponential sums, and give an interesting... 相似文献
35.
As a sequel to [8], we investigate here the behaviour of thetrivial extensions of tilted algebras under stable equivalence.It will be shown that if a finite-dimensional symmetric algebra is stably equivalent to the trivial extension of a tilted algebraB, then is the trivial extension of some tilted algebra A whichhas the same type as B. 相似文献
36.
37.
Using the total human/mouse DNA as the probe, screening has been carried out three times with in situ plaque hybridization to obtain the single-copy DNA sequence from the human X chromosome genomic library. The effective rate of screening is 1. 45%. DNAs from clones containing single-copy inserts have been analyzed by a panel of hybrid cells with or without human X chromosome. Three segments, designated by DXFD52,73,75, are mapped to the X chromosome. DXFD52 has been precisely localized on Xq12-q13 with in situ chromosomal hybridization. DXFD52 has been partially sequenced. The results indicate that DXFD52 is a new isolated single-copy segment on the X chromosome. Great progress in the RFLPs study with DXFD52 has been achieved in the population of Chongqing, Sichuan Province. The results show that the DXFD52 can be used to detect the RFLP with Hind Ⅲ, Bgl Ⅱ, and Hinf Ⅰ. DXFD52 will be a potential "landmark" for the construction of the complete linkage map of human genome and the analysis of genomic s 相似文献
38.
S. W. Peng 《Heat and Mass Transfer》1994,29(8):501-505
Present paper presents a derivation of Luikov equations applicable to sublimation-drying. The physical situation and transfer mechanism are elucidated clearly. The coefficients appearing in Luikov equations are given in a more explicit way. Some formulation mistakes in recent publications are indicated.
Nomenclature C M v/V f, concentration of vapor, kg/m3 - c pv specific heat of vapor at constant pressure, J/kg K - c pw specific heat of adsorbed water at constant pressure, J/kg K - c s specific heat of solid skeleton, J/kg K - C s M s/V f, concentration of solid skeleton, kg/m3 - C w M w/V f, concentration of adsorbed water, kg/m3 - f V w/V f, volumetric fraction of adsorbed water - j F mass flux of vapor by diffusion (Fick) transfer, kg/m2 s - j D mass flux of vapor by filtration (Darcy) transfer, kg/m2 s - j v total mass flux of vapor, kg/m2 s - k permeability, m2 - M s mass of solid skeleton, kg - M v mass of vapor in pores, kg - M w mass of adsorbed water, kg - P pressure, Pa - q heat flux, W/m2 - R gas constant, J/kg K - T temperature, K - V f volume of the framework of porous medium, m3 - V v volume of vapor in porous medium, m3 - V w volume of the absorbed water, m3 Greek symbols /(c p), effective thermal diffusivity, m2/s - m effective vapor diffusivity in porous medium, m2/s - p R T /, Luikov pressure diffusivity, m2/s - +f, porosity of the porous medium - effective thermal conductivity of porous body, W/m K - dynamic viscosity of vapor, kg/m s - kinematic viscosity, m2/s - Ck/=k/, Luikov filtration motion coefficient, s - V v/V f, volumetric fraction of vapor - density of absorbed water, kg/m3 - (c p) M v c pv+M s c s+M w c pw /V f=Cc pv+C s c s+fc pw, effective product of density and specific heat of humid porous body, J/m3K 相似文献
Anwendung der Luikov-Gleichungen auf die Sublimationstrocknung
Zusammenfassung Die Untersuchung bezieht sich auf eine Ableitung der Luikov-Gleichungen, mittels deren sich der Vorgang der Sublimationstrocknung analysieren läßt. Physikalische Anfangssituation und Austauschmechanismen werden klar herausgestellt und die in den Luikov-Gleichungen auftretenden Koeffizienten in expliziter Weise angegeben. Ferner erfolgt Hinweis auf Formulierungsfehler in jüngeren Veröffentlichungen.
Nomenclature C M v/V f, concentration of vapor, kg/m3 - c pv specific heat of vapor at constant pressure, J/kg K - c pw specific heat of adsorbed water at constant pressure, J/kg K - c s specific heat of solid skeleton, J/kg K - C s M s/V f, concentration of solid skeleton, kg/m3 - C w M w/V f, concentration of adsorbed water, kg/m3 - f V w/V f, volumetric fraction of adsorbed water - j F mass flux of vapor by diffusion (Fick) transfer, kg/m2 s - j D mass flux of vapor by filtration (Darcy) transfer, kg/m2 s - j v total mass flux of vapor, kg/m2 s - k permeability, m2 - M s mass of solid skeleton, kg - M v mass of vapor in pores, kg - M w mass of adsorbed water, kg - P pressure, Pa - q heat flux, W/m2 - R gas constant, J/kg K - T temperature, K - V f volume of the framework of porous medium, m3 - V v volume of vapor in porous medium, m3 - V w volume of the absorbed water, m3 Greek symbols /(c p), effective thermal diffusivity, m2/s - m effective vapor diffusivity in porous medium, m2/s - p R T /, Luikov pressure diffusivity, m2/s - +f, porosity of the porous medium - effective thermal conductivity of porous body, W/m K - dynamic viscosity of vapor, kg/m s - kinematic viscosity, m2/s - Ck/=k/, Luikov filtration motion coefficient, s - V v/V f, volumetric fraction of vapor - density of absorbed water, kg/m3 - (c p) M v c pv+M s c s+M w c pw /V f=Cc pv+C s c s+fc pw, effective product of density and specific heat of humid porous body, J/m3K 相似文献
39.
40.