全文获取类型
收费全文 | 7760篇 |
免费 | 1224篇 |
国内免费 | 827篇 |
专业分类
化学 | 5369篇 |
晶体学 | 77篇 |
力学 | 458篇 |
综合类 | 55篇 |
数学 | 722篇 |
物理学 | 3130篇 |
出版年
2024年 | 21篇 |
2023年 | 190篇 |
2022年 | 191篇 |
2021年 | 233篇 |
2020年 | 337篇 |
2019年 | 281篇 |
2018年 | 254篇 |
2017年 | 231篇 |
2016年 | 337篇 |
2015年 | 334篇 |
2014年 | 411篇 |
2013年 | 571篇 |
2012年 | 610篇 |
2011年 | 657篇 |
2010年 | 434篇 |
2009年 | 448篇 |
2008年 | 463篇 |
2007年 | 393篇 |
2006年 | 384篇 |
2005年 | 363篇 |
2004年 | 283篇 |
2003年 | 213篇 |
2002年 | 238篇 |
2001年 | 180篇 |
2000年 | 176篇 |
1999年 | 190篇 |
1998年 | 137篇 |
1997年 | 133篇 |
1996年 | 159篇 |
1995年 | 115篇 |
1994年 | 117篇 |
1993年 | 112篇 |
1992年 | 101篇 |
1991年 | 84篇 |
1990年 | 64篇 |
1989年 | 77篇 |
1988年 | 54篇 |
1987年 | 46篇 |
1986年 | 39篇 |
1985年 | 38篇 |
1984年 | 19篇 |
1983年 | 21篇 |
1982年 | 14篇 |
1981年 | 13篇 |
1980年 | 9篇 |
1979年 | 6篇 |
1976年 | 4篇 |
1973年 | 3篇 |
1970年 | 3篇 |
1957年 | 4篇 |
排序方式: 共有9811条查询结果,搜索用时 31 毫秒
51.
Al2O3 incorporated HfO2 films grown by atomic layer deposition (ALD) were investigated by high-resolution X-ray photoelectron spectroscopy (HRXPS). The core level energy state of a 15 Å thick film showed a shift to higher binding energy, as the result of a silicate formation and Al2O3 incorporation. The incorporation of Al2O3 into the HfO2 film had no effect on silicate formation at the interface between the film and Si, while the ionic bonding characteristics and hybridization effects were enhanced compared to a pure HfO2 film. The dissociation of the film in an ultrahigh vacuum (UHV) is effectively suppressed compared to a pure HfO2 film, indicating an enhanced thermal stability of Hf-Al-O. Any dissociated Al2O3 on the film surface was completely removed into the vacuum by vacuum annealing treatment over 850 °C, while HfO2 contributed to Hf silicide formation on the film surface. 相似文献
52.
Preparation and microwave absorption properties of electroless Co-Ni-P coated strontium ferrite powder 总被引:1,自引:0,他引:1
A new type of Co-Ni-P coated strontium ferrite nanocomposite was prepared with electroless plating enhanced by ultrasonic wave at room temperature. The plating process was studied carefully. The morphology, crystal structure and microwave absorption properties of the Co-Ni-P coated powder were studied with field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), energy dispersive analysis of X-rays (EDX) and vector network analyzer. The results show that the strontium ferrite powder was successfully coated with Co-Ni-P alloy and possesses excellent microwave absorption properties. The maximum microwave loss of the composite powder reaches −44.12 dB. The bandwidth with the loss above −10 dB exceeds 13.8 GHz. 相似文献
53.
The generalized Mycielskians (also known as cones over graphs) are the natural generalization of the Mycielski graphs (which were first introduced by Mycielski in 1955). Given a graph G and any integer m?0, one can transform G into a new graph μm(G), the generalized Mycielskian of G. This paper investigates circular clique number, total domination number, open packing number, fractional open packing number, vertex cover number, determinant, spectrum, and biclique partition number of μm(G). 相似文献
54.
55.
56.
R. Lü H. Pan J.-L. Zhu B.-L. Gu 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,26(4):479-491
The tunneling of a giant spin at excited levels is studied theoretically in mesoscopic magnets with a magnetic field at an
arbitrary angle in the easy plane. Different structures of the tunneling barriers can be generated by the magnetocrystalline
anisotropy, the magnitude and the orientation of the field. By calculating the nonvacuum instanton solution explicitly, we
obtain the tunnel splittings and the tunneling rates for different angle ranges of the external magnetic field ( θ
H = π/2 and π/2 < θ
H < π). The temperature dependences of the decay rates are clearly shown for each case. It is found that the tunneling rate
and the crossover temperature depend on the orientation of the external magnetic field. This feature can be tested with the
use of existing experimental techniques.
Received 12 March 2001 and Received in final form 18 October 2001 相似文献
57.
利用原子力显微镜分析了ZnO薄膜在具有本征氧化层的Si(100)和Si(111)基片上的表面形貌 随沉积时间的演化. 通过对薄膜生长形貌的动力学标度表征,研究了射频反应磁控溅射条件 下,ZnO薄膜的成核过程及生长动力学行为. 研究发现,ZnO在基片表面的成核过程可分为初 期成核阶段、低速率成核阶段和二次成核阶段. 对于Si(100)基片,三个成核阶段的生长指 数分别为β1=1.04,β2=0.25±0.01,β3=0.74;对 于Si(11
关键词:
ZnO薄膜
磁控溅射
生长动力学
成核机制 相似文献
58.
Raman spectra of ceramic Sr2Bi4Ti5O18 (SBTi5) are reported to consist of four different Raman bands. Temperature-dependent spectra reveal the relationship between the lattice vibration and the material's structure. There appears a relatively large change in structure of the material at about 273K, The anharmonic potential of the material has a great influence on its phonon mode full width at half maximum (FWHM), which can be expressed by a function of temperature. Theoretical fittings of the FWHMs for the two modes at around 312 cm^-1 and 464cm^-1 indicate that the latter phonon mode is more anharmonic than the former one. 相似文献
59.
计算全息图产生的锥面波在激光准直中的应用 总被引:1,自引:0,他引:1
本文提出了用计算全息图产生锥面波的方法.将全息图置于激光光路中,它的衍射图样中心在空间形成了一条准直线.文中对锥面波的传播、准直精度及准直距离作了理论分析,给出了实验结果. 相似文献
60.
利用不同能量的质子在大气环境中辐照拟南芥的含水种子,能量从1.1MeV到6.5MeV.根据模拟计算结果,相应能量的离子对种子的损伤区域分别为胚的浅层、胚的一半和整个胚.本实验中,具有较高能量的质子可以完全均匀地作用于拟南芥生长、发育及遗传密切相关的胚茎端分生组织,而能量较低的质子则不能直接作用于茎端分生组织.实验所用质子注量范围为4×109ions/cm2—1×1014ions/cm2.实验结果显示,虽然拟南芥种子的发芽率和幼苗存活率随离子注量增加都呈现下降的趋势,但对应于不同的胚损伤区域,即在不同的入射质子能量条件下,注量曲线具有各自的特征.实验结果显示,拟南芥种子中除了胚茎端分生组织作为对离子辐照敏感的辐射主靶外,茎端分生组织之外的胚区域可能作为离子辐射次靶,影响到最终的辐射生物学效应.
关键词:
离子辐照
拟南芥
胚区域
生物效应 相似文献