全文获取类型
收费全文 | 24592篇 |
免费 | 3661篇 |
国内免费 | 2237篇 |
专业分类
化学 | 8031篇 |
晶体学 | 154篇 |
力学 | 2764篇 |
综合类 | 558篇 |
数学 | 9717篇 |
物理学 | 9266篇 |
出版年
2024年 | 51篇 |
2023年 | 612篇 |
2022年 | 561篇 |
2021年 | 627篇 |
2020年 | 661篇 |
2019年 | 598篇 |
2018年 | 580篇 |
2017年 | 843篇 |
2016年 | 977篇 |
2015年 | 790篇 |
2014年 | 1335篇 |
2013年 | 1665篇 |
2012年 | 1340篇 |
2011年 | 1509篇 |
2010年 | 1356篇 |
2009年 | 1534篇 |
2008年 | 1670篇 |
2007年 | 1777篇 |
2006年 | 1470篇 |
2005年 | 1326篇 |
2004年 | 1260篇 |
2003年 | 1032篇 |
2002年 | 967篇 |
2001年 | 815篇 |
2000年 | 686篇 |
1999年 | 652篇 |
1998年 | 570篇 |
1997年 | 497篇 |
1996年 | 443篇 |
1995年 | 418篇 |
1994年 | 274篇 |
1993年 | 256篇 |
1992年 | 190篇 |
1991年 | 219篇 |
1990年 | 151篇 |
1989年 | 99篇 |
1988年 | 142篇 |
1987年 | 84篇 |
1986年 | 73篇 |
1985年 | 69篇 |
1984年 | 53篇 |
1983年 | 33篇 |
1982年 | 36篇 |
1981年 | 45篇 |
1980年 | 31篇 |
1979年 | 33篇 |
1978年 | 21篇 |
1977年 | 13篇 |
1976年 | 11篇 |
1974年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
Successive stepwise evolution of host layer‐stacking framework upon the intercalation of mobile vapor guests within side‐chain layers
下载免费PDF全文
![点击此处可从《Journal of Polymer Science.Polymer Physics》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Bei‐Kai Yang Chen‐An Wang Wen‐Yan Zhang Jrjeng Ruan 《Journal of Polymer Science.Polymer Physics》2017,55(19):1448-1457
For the ordered phases of hairy‐rod semiconductive poly(2,5‐bis(3‐tetradecylthiophene‐2‐yl)thieno[3,2‐b]thiophene) (PBTTT) sandwiched in between crystalline platelets of hexamethylbenzene, the successive stepwise evolution of layer‐stacking framework upon guest intercalation has been studied in this research. The direct consequence of the guest intercalation into side‐chain layers is evaluated to cause the lateral shift of thiophene backbones along π–π stacking, resulting in stepwise shift of ultraviolet absorption wavelength. The thermal motions of vapor guests within disordering side‐chain layers subsequently cause progressive expansion of host stacking framework. With the increase in side‐chain length, thicker layers of disordering side chains in liquid crystals (LCs) accommodate additional vapor guests and larger amplitudes of thermal motions of guests, hence promoting the level of reversible d‐spacing change. The mixing between mobile vapor guests and aliphatic side chains is clarified as the mechanism of guest intercalation, which rationalizes successive guest intercalation during heating and the contribution of disordering side‐chain layers. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 , 55, 1448–1456 相似文献
902.
高硅煤中Si-Al-Fe-Ca四元体系碳热反应研究 《燃料化学学报》2017,45(11):1296-1302
研究了不同温度条件下高硅煤中矿物组成比例下的Si-Al-Fe-Ca多元体系的碳热反应以及其影响因素。通过XRD和FESEM-EDS技术对各还原产物进行分析。结果表明,Fe_2O_3对含硅矿物的碳热反应起促进作用,Fe可以有效提高Si反应活性。CaO在较低温度时与灰中的Al_2O_3和SiO_2反应形成致密的Ca-Al-Si相共熔体CaAl_2Si_2O_8,阻碍含硅矿物碳热反应的进行。随着温度的升高,继续反应生成SiC、CaAl_4O_7和CaSiO_3。热力学模拟计算与实验结果基本吻合。 相似文献
903.
The V-system is a complete orthogonal system of functions defined on the interval [0, 1], generated by finite Legendre polynomials
and the dilation and translation of a function generator, which consists of a finite number of continuous and discontinuous
functions. The V-system has interesting properties, such as orthogonality, symmetry, completeness and short compact support.
It is shown in this paper that the V-system is essentially a special multi-wavelet basis. As a result, some basic properties
of the V-system are established through the well-developed theory of multi-wavelets. From this point of view, more other V-systems
are constructed. 相似文献
904.
The identification of the vibration control system parameters designed for continuous miner machines
The Continuous Miner machines are exposed to time dependent loads during normal operation of the rock cutting process. These loads cause vibrations, which have a negative influence on the whole structure of the machine. This phenomenon can be eliminated by applying passive or active vibration control systems (VCS). Generally these systems are coupled with additional elements, which provide dispersion or transfer energy. The energy thus acquired can also reinforce the intended function such as rock cutting operation in the case of mining machines. The objective of this paper is to present the method of numerical identification of VCS parameters for Continuous Miner machines. The main function of the presented system is to reduce displacement of cutting drum by using elastic element joined to machine chassis and applying appropriate algorithm of control of the angular velocity of cutting drum. The method described improves efficiency of mining and increases durability of machine. In order to determine mechanical and control parameters of VCS the genetic algorithm optimisation method conjugated with numerical modal analysis was used. Finally the transient dynamic analysis was performed for the full-scale model of Continuous Miner in order to verify VCS in normal working condition. 相似文献
905.
We show that a recently proposed Rudin–Shapiro-like sequence, with balanced weights, has purely singular continuous diffraction spectrum, in contrast to the well-known Rudin–Shapiro sequence whose diffraction is absolutely continuous. This answers a question that had been raised about this new sequence. 相似文献
906.
Penetration depth and spatial resolution of Raman hyperspectral imaging system were studied for effective detection of benzoyl peroxide in flour. The determinations of parameters were achieved by using the single-band background-correct image of a benzoyl peroxide Raman characteristic band and a simple threshold method. The selected parameters were used to detect mixture samples with different concentrations. Percentage of detected benzoyl peroxide pixels was positively correlated to its concentration. The result shows that parameters selected in this study are effective for the detection of benzoyl peroxide additive in flour and can be used for quantitative analysis in the future. 相似文献
907.
Tarak Saied Nourchaine Jelaiel Mohamed Lotfi Efrit Yves Fort Corinne Comoy 《Tetrahedron》2017,73(11):1489-1494
We report herein a short and efficient synthesis of benz[e][1,2,4]- or [d][1,2,6]oxadiazepines and benzo[f][1,3,5]triazocines from easily prepared N-aryl iminoesters. The strategy involves a bis-nucleophile reagent (hydroxylamine or guanidine) that promotes a one-step ring closure from the starting functionalized iminoesters. 相似文献
908.
This paper deals with ultrasound medical image processing, particularly to filter the noise while preserving the edges and
structures of information. The mathematical processing consists in solving by a numerical way a nonlinear evolutive boundary
value problem. Several numerical semi-implicit time marching schemes are considered and analyzed. At each time step, parallel
synchronous or asynchronous Schwarz alternating methods are used to solve the linear system and its convergence is studied.
Lastly, the results of sequential and parallel simulations are presented.
相似文献
909.
局部方差在图像质量评价中的应用 总被引:4,自引:0,他引:4
将灰度图像的局部方差分布(QLS)作为表征图像结构信息的一个重要特征,对局部方差分布矩阵进行奇异值分解,计算得到相应的奇异值特征向量;通过计算降质图像与原参考图像局部方差矩阵奇异值特征向量的夹角大小度量两图像的结构相似度,实现了对降质图像的质量评价。实验结果表明:局部方差分布更能突出图像的结构特征,评价结果优于传统的均方误差(MSE)、峰值信噪比(PSNR)、结构相似度(SSIM)以及直接评价图像像素分布的奇异值分析(SVD)等方法,与人眼视觉感知效果的一致性较好。 相似文献
910.
We consider a general Euler-Korteweg-Poisson system in R 3, supplemented with the space periodic boundary conditions, where the quantum hydrodynamics equations and the classical fluid dynamics equations with capillarity are recovered as particular examples. We show that the system admits infinitely many global-in-time weak solutions for any sufficiently smooth initial data including the case of a vanishing initial density - the vacuum zones. Moreover, there is a vast family of initial data, for which the Cauchy problem possesses infinitely many dissipative weak solutions, i.e. the weak solutions satisfying the energy inequality. Finally, we establish the weak-strong uniqueness property in a class of solutions without vacuum. In this paper we show that, even in presence of a dispersive tensor, we have the same phenomena found by De Lellis and Székelyhidi. 相似文献