全文获取类型
收费全文 | 15886篇 |
免费 | 894篇 |
国内免费 | 1193篇 |
专业分类
化学 | 4321篇 |
晶体学 | 193篇 |
力学 | 209篇 |
综合类 | 76篇 |
数学 | 1061篇 |
物理学 | 8371篇 |
无线电 | 3742篇 |
出版年
2024年 | 20篇 |
2023年 | 125篇 |
2022年 | 165篇 |
2021年 | 174篇 |
2020年 | 242篇 |
2019年 | 262篇 |
2018年 | 287篇 |
2017年 | 417篇 |
2016年 | 521篇 |
2015年 | 512篇 |
2014年 | 1053篇 |
2013年 | 928篇 |
2012年 | 744篇 |
2011年 | 1221篇 |
2010年 | 853篇 |
2009年 | 1059篇 |
2008年 | 1024篇 |
2007年 | 1139篇 |
2006年 | 912篇 |
2005年 | 744篇 |
2004年 | 644篇 |
2003年 | 583篇 |
2002年 | 542篇 |
2001年 | 478篇 |
2000年 | 403篇 |
1999年 | 415篇 |
1998年 | 377篇 |
1997年 | 298篇 |
1996年 | 320篇 |
1995年 | 227篇 |
1994年 | 192篇 |
1993年 | 140篇 |
1992年 | 159篇 |
1991年 | 135篇 |
1990年 | 132篇 |
1989年 | 124篇 |
1988年 | 82篇 |
1987年 | 54篇 |
1986年 | 42篇 |
1985年 | 33篇 |
1984年 | 34篇 |
1983年 | 16篇 |
1982年 | 23篇 |
1981年 | 21篇 |
1980年 | 18篇 |
1979年 | 15篇 |
1978年 | 14篇 |
1977年 | 10篇 |
1976年 | 9篇 |
1973年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Nagendranath Mahata V. Vishwanathan 《Journal of molecular catalysis. A, Chemical》1997,120(1-3):267-270
Kinetics of vapor phase hydrogenation of phenol to cyclohexanone over Pd/MgO system has been studied in a flow microreactor under normal atmospheric pressure. The reaction rate is found to be negative order with respect to the partial pressure of phenol and has increased from −0.5 to 0.5 with increasing temperature (473 to 563 K). The apparent activation energy (Ea) of the process is found to be close to 65 kJ per mol. On the basis of kinetic results a surface mechanism is proposed. 相似文献
992.
993.
Three new compounds, LaCuOTe, CeCuOTe, and NdCuOTe, have been synthesized from the respective rare-earth elements, CuO, and a KI flux at 1023 K. The compounds, which have the ZrSiCuAs structure type, are isostructural to LaCuOS, and crystallize in space group P4/nmm of the tetragonal system with two formula units in cells of dimensions at 153 K of , , for LaCuOTe; , , for CeCuOTe; and , , for NdCuOTe. The structure of LnCuOTe (Ln=La, Ce, Nd) is composed of alternating PbO-like [Ln2O2] and anti-PbO-like [Cu2Te2] layers stacked perpendicular to [0 0 1]. The experimental optical band gaps of LaCuOTe and NdCuOTe are 2.31 and 2.26 eV, respectively. At 298 K the electrical conductivity of LaCuOTe is 1.65 S/cm and the Hall mobility is +80.6 cm2 V−1 s−1. The positive values of the Seebeck and Hall coefficients indicate p-type electrical conduction. First-principles theoretical calculations were performed on LaCuOQ (Q=S, Se, Te). In LaCuOTe, Cu 3d and Te 5p orbitals dominate the states near the valence band maximum; the states near the conduction band minimum are composed of Cu 4s, Te 5p, and La 5d orbitals. The larger dispersion of Cu 3d orbitals and the presence of Te 5p orbitals near the valence band maximum are responsible for the larger hole mobility of LaCuOTe compared to LaCuOS and LaCuOSe. 相似文献
994.
995.
The structural,elastic, and electronic properties of ZrxNbl-xC alloys from first principle calculations* 下载免费PDF全文
The structural, elastic, electronic, and thermodynamic properties of ZrxNbl xC alloys are investigated using the first principles method based on the density functional theory. The results show that the structural properties of Zr~.Nb1 xC alloys vary continuously with the increase of Zr composition. The alloy possesses both the highest shear modulus (215 GPa) and a higher bulk modulus (294 GPa), with a Zr composition of 0.21. Meanwhile, the Zr0.2! Nb0.79C alloy shows metallic conductivity based on the analysis of the density of states. In addition, the thermodynamic stability of the designed alloys is estimated using the calculated enthalpy of mixing. 相似文献
996.
Seyedeh Leila Hashemi Dashtaki 《Molecular physics》2013,111(14):2195-2203
ABSTRACTRate constants for the reactions of C2H6, C2H5D and C2D6 with .CCl3. for the production of CHCl3 and CDCl3 (k1, k2, k3 and k4) were computed using variational transition state theory coupled with hybrid-meta density functional theory (MPWB1K) over the temperature range of 200–2900 K. The ground-state vibrational adiabatic potential was plotted for all channels. Small- and large-curvature tunnelling were determined to include quantum effects in the calculation of rate constants. Harmonic vibrational frequencies along the reaction path were calculated in curvilinear coordinates with scaled frequencies. Anharmonicity was included in the lowest-frequency torsion. The position of formation and dissociation of bonds was specified using the variation in harmonic vibrational frequencies along the reaction path. Representative tunnelling energy and the thermally averaged transmission probability at 298 K (P(E)exp?( ? ΔE/RT)) were determined for the reactions in which tunnelling is important. The kinetic isotope effect was used to calculate the considerable contributions of tunnelling and vibration. The expressions for rate constants were determined using nonlinear least-square fitting over the temperature range of 200–2900 K. 相似文献
997.
以MgO为缓冲层的硅基铌酸锶钡薄膜取向特性与其波导结构的设计研究 总被引:1,自引:0,他引:1
采用溶胶-凝胶法在Si(100)基片上制备出择优取向的MgO薄膜,随后在其上生长出具有择优取向的铌酸锶钡铁电薄膜.实验发现,MgO缓冲层的应用可以大大提高SBN薄膜的择优取向性能.同时,用五层对称理想波导耦合模理论,以SBN为波导层,分析了波导损耗与厚度的关系. 通过对计算出的理想结果与实际相结合,以及对SBN在生长过程工艺与损耗关系的研究,制备出高质量、低损耗的SBN薄膜,为其在电光波导调制器等微系统中的应用打下良好的基础. 相似文献
998.
从溶液离子影响表面等离子体共振(SPR)光谱特征的角度,分析讨论了光纤SPR光谱对水溶液离子成分检测的灵敏特征,基于此并应用于以矿化度为代表的水质检测中。研究通过对不同离子状态的电解质溶液(NaCl,KCl,CaCl2,MgCl2,Na2CO3,MgSO4和ZnSO4)和非电解质溶液(蔗糖、丙三醇、葡萄糖)下的光纤SPR光谱分析,得到水环境的杂质离子含量对SPR光谱的影响规律,进而实现了水质矿化度的检测。研究同时给出了光纤SPR光谱法与电导率分析法在八种不同水样的检测对比分析,光纤SPR光谱法拥有高灵敏度、快速响应、抗电磁干扰等优点,对光纤SPR技术在水质检测领域的应用打下良好的基础。 相似文献
999.
Theoretical design of pseudo-ternary and quaternary alloys by superlattice structures consisting of (Zn,Cd)(S,Se) binary II–VI
compounds has been studied. For pseudo-ternary ZnCdS and ZnCdSe alloys, the superlattices with two layers in a cycle, i.e.,
ZnS/CdS and ZnSe/CdSe are considered, and for pseudo-quaternary ZnCdSSe alloy, the two superlattice structures with more than
two layers in a cycle are considered. In order to design and evaluate these superlattices, the expression for the equilibrium
in-plane lattice constant of these superlattices has been derived by minimizing the total elastic strain energy in the cycle.
The combinations of layer thicknesses in a cycle and the effective bandgap of these superlattices have been calculated while
the elastic strain effect was included. The usefulness of these superlattice structures has been evaluated. 相似文献
1000.
In a microwave study a program was designed for thermal regulation. This software allows different types of regulations: P, PI, PD or PID (proportional integration derivation). Results obtained with PID and PI regulation for different previous linear heating schedules (1 deg·s?1 and 0.15 deg·s?1) imposed on a polymer sample (DGEBA/3DCM) up to 280°C and more are reported. Mathematical resolution of thermal laws applied to the sample permits the regulation constants (T i,T d andG s) to be linked to the physical features of the polymer. A method used to calculate: the reflexion constant of the wave on the polymer, ρ and the diminution factor, α is presented. 相似文献