全文获取类型
收费全文 | 2053篇 |
免费 | 56篇 |
国内免费 | 174篇 |
专业分类
化学 | 807篇 |
晶体学 | 9篇 |
力学 | 342篇 |
综合类 | 9篇 |
数学 | 554篇 |
物理学 | 562篇 |
出版年
2024年 | 5篇 |
2023年 | 31篇 |
2022年 | 22篇 |
2021年 | 24篇 |
2020年 | 26篇 |
2019年 | 43篇 |
2018年 | 30篇 |
2017年 | 43篇 |
2016年 | 55篇 |
2015年 | 52篇 |
2014年 | 83篇 |
2013年 | 158篇 |
2012年 | 163篇 |
2011年 | 168篇 |
2010年 | 125篇 |
2009年 | 141篇 |
2008年 | 95篇 |
2007年 | 99篇 |
2006年 | 95篇 |
2005年 | 94篇 |
2004年 | 77篇 |
2003年 | 66篇 |
2002年 | 48篇 |
2001年 | 44篇 |
2000年 | 32篇 |
1999年 | 41篇 |
1998年 | 34篇 |
1997年 | 41篇 |
1996年 | 41篇 |
1995年 | 21篇 |
1994年 | 36篇 |
1993年 | 27篇 |
1992年 | 24篇 |
1991年 | 20篇 |
1990年 | 9篇 |
1989年 | 8篇 |
1988年 | 17篇 |
1987年 | 24篇 |
1986年 | 9篇 |
1985年 | 29篇 |
1984年 | 27篇 |
1983年 | 11篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 6篇 |
1978年 | 8篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1975年 | 1篇 |
排序方式: 共有2283条查询结果,搜索用时 15 毫秒
91.
《Comptes Rendus Physique》2015,16(9):776-788
This work presents a Boundary Element Method (BEM) formulation for contactless electromagnetic field assessments. The new scheme is based on a regularised BEM approach that requires the use of electric measurements only. The regularisation is obtained by leveraging on an extension of Calderón techniques to rectangular systems leading to well-conditioned problems independent of the discretisation density. This enables the use of highly discretized Huygens surfaces that can be consequently placed very near to the radiating source. In addition, the new regularised scheme is hybridised with both surfacic homogeneous and volumetric inhomogeneous forward BEM solvers accelerated with fast matrix–vector multiplication schemes. This allows for rapid and effective dosimetric assessments and permits the use of inhomogeneous and realistic head phantoms. Numerical results corroborate the theory and confirms the practical effectiveness of all newly proposed formulations. 相似文献
92.
Jianming Lai Jijun Zhang Linjun Wang Jiahua Min Wenqi Wu Min Shen Wei Liang 《Crystal Research and Technology》2015,50(11):817-822
In this paper, the CdMnTe crystals were grown by the Travelling Heater Method (THM) and the Vertical Bridgman (VB) method, respectively. The crystal properties, including the Mn axial distribution, impurity concentrations, resistivity, Hall effects and energy response spectra, were characterized and compared. The results shown that the CdMnTe crystal grown by the THM had more uniform Mn distribution and lower impurity concentrations compared to the crystal grown by VB method. The resistivity of CdMnTe grown by THM was (1.5 ∼ 8) × 1010 Ω.cm, while the resistivity of CdMnTe grown by VB was 107∼108 Ω.cm. The In dopant distributed uniformly throughout the crystal ingot grown by THM with the doping concentration of 0.6–0.7 ppm, while the In dopant concentration throughout the crystal grown by VB method is in the range of 1.31–2.4 ppm. Hall measurements revealed that the conductivity of the THM grown crystal was weak n‐type conductivity and the VB grown crystal was p‐type conductivity. A planar CdMnTe detector from the THM grown crystal showed a resolution of 8% of the 241Am radiation at 59.5 keV peak, however, no energy response was revealed with the CdMnTe detector by the VB method. The results demonstrate that CdMnTe crystal grown by THM have better crystal quality and detector properties compared to that by VB method. 相似文献
93.
WEI Bo WANG Ye XIN Ming-hong QIU Shi-lun 《高等学校化学研究》2007,23(5):511-513
Phenol was used as an aromatic and acidic solvent in solvothermal synthesis.JBW-type zeolites were successfully synthesized in a phenolic system.The as-synthesized microporous crystals were characterized by powder X-ray diffraction analysis and scanning electron microscopy techniques.The results indicate that phenol is a good organic solvent and has a huge potential of application in studying crystallization mechanism and synthesizing novel microporous materials. 相似文献
94.
95.
96.
We address the evaluation of highly oscillatory integrals,with power-law and logarithmic singularities.Such problems arise in numerical methods in engineering.Notably,the evaluation of oscillatory integrals dominates the run-time for wave-enriched boundary integral formulations for wave scattering,and many of these exhibit singularities.We show that the asymptotic behaviour of the integral depends on the integrand and its derivatives at the singular point of the integrand,the stationary points and the endpoints of the integral.A truncated asymptotic expansion achieves an error that decays faster for increasing frequency.Based on the asymptotic analysis,a Filon-type method is constructed to approximate the integral.Unlike an asymptotic expansion,the Filon method achieves high accuracy for both small and large frequency.Complex-valued quadrature involves interpolation at the zeros of polynomials orthogonal to a complex weight function.Numerical results indicate that the complex-valued Gaussian quadrature achieves the highest accuracy when the three methods are compared.However,while it achieves higher accuracy for the same number of function evaluations,it requires signi cant additional cost of computation of orthogonal polynomials and their zeros. 相似文献
97.
98.
对近期发展的固体圆二色(CD)光谱测试方法进行了概述、评价和比较, 着重探讨了“浓度效应”的存在使固体CD光谱失真的原因. 通过对本课题组和其他作者已报道的四种化合物的固体CD谱再测试的反思, 强调了依手性化合物的手性光谱学性质不同, 根据浓度梯度实验选择其合适测试浓度的必要性. 对固有手性的阻转异构化合物(S)-1,1'-联二萘酚(S-BINOL)进行了成膜法固体CD谱浓度梯度测试, 发现所得固体薄膜CD谱中也存在着“浓度效应” 相似文献
99.
以乙醇为溶剂, 钛酸四丁酯为前驱体, 用溶剂热法制备了Ag表面修饰的负载型纳米二氧化钛光催化剂. 利用X射线衍射(XRD)、N2吸附-脱附(BET)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外-可见(UV-Vis)光谱等技术对其进行了系统的表征, 以亚甲基蓝(MB)溶液的脱色降解为模型反应, 考察了不同Ag含量样品的光催化性能. 结果表明: 用溶剂热法制备的样品中TiO2皆为锐钛矿相, 金属Ag颗粒沉积在TiO2表面, 粒径为2 nm左右, 比表面积较溶胶凝胶法制备的样品大大增加, 最高可达151.44 m2·g-1; UV-Vis光谱和光催化实验表明: Ag修饰使TiO2对光的吸收能力大大增强, 吸收带边红移至可见光区, 亚甲基蓝在该复合材料上的光催化降解反应遵循一级反应动力学模型; 溶剂热法制备样品的光催化性能明显好于溶胶凝胶法制备的样品, 在紫外光和可见光下, Ag摩尔分数为5%的样品表现出最佳的光催化活性. 相似文献
100.