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41.
42.
Dynamics of refractory atom reactions have been studied with a crossed beam apparatus combining two pulsed, supersonic molecular beam sources, a pulsed UV laser for creating the refractory atoms in the gas phase by laser ablation, and a pulsed dye laser to probe the reaction products by laser-induced fluorescence. Examples of the A1(2Pj) + O2(X3∑g)→ A10(X2∑+) + O(3Pj), Mg(1So) + N2O(X1∑+) → MgO(X1∑+,a3Π) + N2(X1∑g+) andC(3Pj) + NO(X2Πr) → CN(X2∑+) + 0(3Pj) systems are given. Comparisons with the studies performed using the conventional steady-state beam approach are made. 相似文献
43.
《Macromolecular bioscience》2017,17(5)
Cell sorting is important for cell biology and regenerative medicine. A visible light‐responsive cell scaffold is produced using gold nanoparticles and collagen gel. Various kinds of cells are cultured on the visible light‐responsive cell scaffold, and the target cells are selectively detached by photoirradiation without any cytotoxicity. This is a new image‐guided cell sorting system.
44.
利用脉冲激光在Si表面刻蚀具有不同宽度和深度的微槽形貌, 通过测量接触角的大小研究其浸润特性, 并分析了形貌与浸润性的关系. 结果表明, 在Si表面刻蚀微槽深度一定的条件下, 刻蚀微槽宽度越宽, 接触角越小; 在Si表面刻蚀微槽宽度一定的条件下, 刻蚀微槽越深, 接触角越大, 最高可达165°. 而且Si表面上刻蚀后产生的细微尖峰结构对其浸润特性有显著的影响. 因此, 利用激光刻蚀表面方法可以在一定程度上调控固体表面的润湿性能. 相似文献
45.
Detlef Günther Albrecht v. Quadt Ronny Wirz Herve Cousin Volker J. Dietrich 《Mikrochimica acta》2001,136(3-4):101-107
Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) was used as a complementary technique to X-ray fluorescence
(XRF), for multi-element analysis of geological samples fused with lithium-tetraborate Li2B4O7). Different calibration strategies using external non-matrix matched reference materials were investigated. Various internal
standards were tested, including the use of Li from the flux, and the use of the naturally occurring internal standards, Si
or Ca. The use of a naturally occurring standard is not as efficient as this required a prior analysis of the samples using
XRF. The obtained values for the analysis of geological reference materials were compared with consensus literature values,
and satisfactory agreement was found. Laser pits, which were formed, had a diameter of 80 μm and 3–5 replicates on each fused
disc were measured. The reproducibility of the method was better than 10% for concentrations above 1 μg/g and better than
15% for lower concentrations. The use of Li as the internal standard offers the possibility of multi-element determinations
in geological samples, which have an unknown composition when the laser ablation analysis is carried out. However, using the
calculated stoichiometric composition of the lithium-tetraborate for the calculation of the Li concentration leads to a constant
deviation from the recommended values. Therefore, it was necessary to determine the Li concentration within each sample batch
using at least one lithium tetraborate fused geological reference material. This resulting Li concentration in the beads was
then used for all subsequent samples in a run. Limits of detection, reproducibility, deviation from reference values indicate
the potential of LA-ICP-MS for such bulk analysis without matrix matched calibration standards. 相似文献
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48.
酚醛树脂(PF)因其具有良好的耐热性能和机械性能而被广泛应用。但其耐热性能已经满足不了现代航空航天技术的需求,研究发现,采用硼酸对酚醛树脂进行改性,可以制得具有优良耐高温性能的硼酚醛树脂(BPF)。采用硼酸酯法合成硼酚醛树脂,n(苯酚)∶n(甲醛)=1∶1.5时耐热性最佳。热分析结果表明,合成的BPF在1000℃条件下的残炭率为78%,其耐热性能明显优于传统的酚醛树脂。同时讨论了不同硼酸含量对BPF耐热性能的影响,当n(硼酸)∶n(苯酚)0.33∶1时,残炭率趋于稳定。此外,利用差示扫描量热仪(DSC)方法确定BPF预固化温度为160℃,后固化温度为220℃。 相似文献
49.
Hicham Benaissa El‐Hassan Benkhira Rachid Fakhar Abdelhadi Hachlaf 《Mathematical Methods in the Applied Sciences》2019,42(4):1292-1311
We consider here a mathematical model describing the bilateral frictional contact between a thermo‐piezoelectric body and a thermally conductive foundation. We model the behavior of the material with a linear thermo‐electro‐elastic constitutive law. The process is assumed to be quasistatic and the contact is modeled with a nonlocal version of Coulomb's dry friction law, in which the frictional heat generated in the process, is taken into account. We drive a variational formulation of the problem and establish the existence of its weak solution. 相似文献
50.
在Jan Peter Sasse(2011)分析的基础上,进一步放宽其假设条件,利用不完全信息下的信号传递模型,对双边投资协定(Bilateral Investment Treaty,BIT)的信号效应机制进行分析.研究发现:BIT作为东道国传递给投资者的信号,该信号有效的条件在于BIT遵守成本的差异,投资者因此有了区分不同类型东道国的依据.东道国之间的引资竞争关系,会不断升级BIT的版本与内容,直至投资环境较差东道国的遵守成本高至无法覆盖签订BIT所带来的投资收益,此时高标准BIT的二次信号有效.此外,在模型拓展分析的基础之上,试图解释了“为何当前高标准BIT已成为各国所关注的对象?以及投资环境越自由的东道国所签订的BIT标准为何越高?”等问题,这对于理解BIT影响外商直接投资的信号机制提供了新的视角与思路. 相似文献