全文获取类型
收费全文 | 1451篇 |
免费 | 245篇 |
国内免费 | 741篇 |
专业分类
化学 | 1428篇 |
晶体学 | 69篇 |
力学 | 351篇 |
综合类 | 50篇 |
数学 | 102篇 |
物理学 | 437篇 |
出版年
2024年 | 14篇 |
2023年 | 52篇 |
2022年 | 79篇 |
2021年 | 69篇 |
2020年 | 79篇 |
2019年 | 50篇 |
2018年 | 34篇 |
2017年 | 66篇 |
2016年 | 79篇 |
2015年 | 64篇 |
2014年 | 161篇 |
2013年 | 131篇 |
2012年 | 110篇 |
2011年 | 96篇 |
2010年 | 122篇 |
2009年 | 120篇 |
2008年 | 146篇 |
2007年 | 113篇 |
2006年 | 120篇 |
2005年 | 99篇 |
2004年 | 78篇 |
2003年 | 66篇 |
2002年 | 73篇 |
2001年 | 49篇 |
2000年 | 42篇 |
1999年 | 44篇 |
1998年 | 40篇 |
1997年 | 35篇 |
1996年 | 41篇 |
1995年 | 23篇 |
1994年 | 21篇 |
1993年 | 33篇 |
1992年 | 25篇 |
1991年 | 17篇 |
1990年 | 17篇 |
1989年 | 18篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1983年 | 1篇 |
排序方式: 共有2437条查询结果,搜索用时 15 毫秒
101.
A Fully Vectorial Effective Index Method for Accurate Dispersion Calculation of Photonic Crystal Fibres 下载免费PDF全文
A fully vectorial effective index method is developed for accurate dispersion calculation of photonic crystal fibres (PCFs). In order to improve the accuracy of the model, different values for the effective core radius are used when PCFs have different fibre parameters. The accuracy of our approach is demonstrated by comparing our results with other numerical and experimental results reported in literature. It is found that the accuracy of the fully vectorial effective index method is improved and our results agree well with accurate numerical results obtained by other methods as well as the previously reported experimental data. 相似文献
102.
Long-period fibre gratings inside standard single-mode optical communication fibres are successfully fabricated with infrared femtosecond laser pulses. The refractive index perturbations are well confined within the fibre core by choosing the proper laser focusing parameters and translation speed of the fibre during the direct laser writing process. With the self-focusing effect considered and at a constant average irradiation dose of 1.62 × 10^3 J/(cm^2μm), the threshold intensity for fabricating long-period gratings with infrared femtosecond laser pulses is determined to be 5.13 × 10^13 W/cm2. 相似文献
103.
A fiber Bragg grating (FBG) hydrophone with high sensitivity was demonstrated. This hydrophone used a rubber diaphragm and a copper hard core as the sensing element. To compensate the hydrostatic pressure, a capillary tube was fixed at the end of the hydrophone. Theoretical analysis of the acoustic pressure sensitivity was given in this letter. Experiments were carried out to test the frequency response of the hydrophone. The result shows that when the Young's modulus of the diaphragm is higher, a flatter frequency response will be obtained. 相似文献
104.
105.
Structural and Photoluminescence Properties of β-Ga2O3 Nanofibres Fabricated by Electrospinning Method 下载免费PDF全文
We have prepared the 13-Ga2 O3 nanofibres by electrospinning method followed by calcining in air at 900℃. The morphology and structure of the nanofibres are characterized by field emission scanning electron microscopy (FE-SEM), x-ray diffraction (XRD) and Raman technique. These nanofibres have diameters ranging from 60 to 130hm and lengths up to several millimetres. Photoluminescence (PL) spectrum under excitation at 325 nm shows that theseβ-Ga2 O3 nanofibres have a blue emission peaking at 466nm, which may be attributed to defects such as the oxygen vacancies, gallium vacancies and gallium-oxygen vacancy pairs. 相似文献
106.
Nano-fibrillar arrays are fabricated using polystyrene materials. The average diameter of each fiber is about 300 nm. Experiments show that such a fibrillar surface possesses a relatively hydrophobie feature with a water contact angle of 142°. Nanoscale friction properties are mainly focused on. It is found that the friction force of polystyrene nano-fibrillar surfaces is obviously enhanced in contrast to polystyrene smooth surfaces. The apparent coefficient of friction increases with the applied load, but is independent of the scanning speed. An interesting observation is that the friction force increases almost linearly with the real contact area, which abides by the fundamental Bowden-Tabor law of nano-seale friction. 相似文献
107.
基于艾琳方程,提出用于定量分析纤维表面和纳米涂覆层间的纳米界面结构的理论模型.实验结果表明,纤维高分子链段受力塑性变形时,纳米界面结构内纳米微粒阻碍其形貌变化产生热激活体积,该热激活体积是纳米界面结构性能的重要表征;氧等离子体处理对纳米二氧化硅溶胶涂覆高强、高模聚乙烯纤维有增韧作用.由不同处理样品的扫描电子显微镜图片和傅里叶变换红外光谱曲线对比分析可知,经氧等离子体处理纳米二氧化硅溶胶涂覆高强、高模聚乙烯纤维的纳米涂覆层纳米颗粒分布均匀,纳米颗粒还填补纤维表面微观缺陷,活性官能团被引入到纤维表面.
关键词:
激活体积
氧等离子体
高强、高模聚乙烯纤维
纳米界面结构 相似文献
108.
109.
An aligned zinc oxide nanofibre array has been fabricated by heating the mixture of ZnO, Ga2Oa, and graphite powders in atmosphere. The ZnO nanofibre showed a uniform size of about 150nm in diameter and 50μm in length. The nanofibres grew predominantly along one direction. Both x-ray diffraction (XRD) and Raman shift spectra show that the product is composed of ZnO with the typical hexagonal structure. The good crystallinity of these ZnO nanofibres has been verified by photoluminescence spectra with strong UV emission at 287nm and weak green band emission observed at room temperature. The component of the product was analysed by XRD,Raman shift spectrum, x-ray energy dispersion (EDX) and x-ray photoelectronic energy spectroscopy (XPS). The growth process and the characteristics can be interpreted by vapour-liquid-solid mechanism. 相似文献
110.
能谱法和催化光度法测定无机纤维中铁含量的比较研究 总被引:1,自引:0,他引:1
本文研究了铁(Ⅲ)在酸性介质中催化抗坏血酸(Vc或H2A)还原4-硝基-3’-甲基-氨基偶氮苯的褪色反应,拟定了反应的最佳条件,探讨了反应机理,建立了催化动力学测定痕量铁的新方法,该方法的检出限为2.98×10~(-11)g·mL-1,线性范围为0-200 ng·(25 mL)-1。比较了X射线能量色散谱法和催化光度法在玄武岩纤维样品中铁含量的测定,结果误差为2.89%。 相似文献