全文获取类型
收费全文 | 3193篇 |
免费 | 428篇 |
国内免费 | 304篇 |
专业分类
化学 | 592篇 |
晶体学 | 8篇 |
力学 | 305篇 |
综合类 | 68篇 |
数学 | 1918篇 |
物理学 | 1034篇 |
出版年
2023年 | 45篇 |
2022年 | 37篇 |
2021年 | 108篇 |
2020年 | 115篇 |
2019年 | 77篇 |
2018年 | 84篇 |
2017年 | 95篇 |
2016年 | 103篇 |
2015年 | 89篇 |
2014年 | 150篇 |
2013年 | 252篇 |
2012年 | 154篇 |
2011年 | 178篇 |
2010年 | 173篇 |
2009年 | 178篇 |
2008年 | 213篇 |
2007年 | 203篇 |
2006年 | 210篇 |
2005年 | 177篇 |
2004年 | 138篇 |
2003年 | 141篇 |
2002年 | 146篇 |
2001年 | 114篇 |
2000年 | 102篇 |
1999年 | 95篇 |
1998年 | 89篇 |
1997年 | 76篇 |
1996年 | 64篇 |
1995年 | 50篇 |
1994年 | 36篇 |
1993年 | 28篇 |
1992年 | 25篇 |
1991年 | 31篇 |
1990年 | 19篇 |
1989年 | 15篇 |
1988年 | 13篇 |
1987年 | 11篇 |
1986年 | 11篇 |
1985年 | 20篇 |
1984年 | 12篇 |
1983年 | 6篇 |
1982年 | 13篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1975年 | 1篇 |
1970年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有3925条查询结果,搜索用时 17 毫秒
41.
等截面梁有限变形的传递函数增量算法 总被引:1,自引:1,他引:1
本文介绍了一种计算等截面梁有限变形的新方法-传递函数增量算法,它是一种半解析数值计算方法。此算法充分利用增量失空法Gauss求积公式计算非线性有限变形的特点,并将这些特点与传递函数方法,有效地结合起来,既避免了数值方法计算量大的困难,又使得求解高阶非线性微分方程的解析解成为可能,算例分析表明,这是一种易编程,计算量小,收敛快,求解精度高的行之有效的计算方法。 相似文献
42.
43.
单裂隙流-固耦合渗流的试验研究 总被引:9,自引:0,他引:9
通过对较大尺寸的单裂隙岩体试块进行不同侧面加载的渗流试验,在实验室里开展了单裂隙流 固耦合渗流研究,模拟核废料贮藏库的围岩自由面的最危险部位的渗流量 应力耦合状态。分析了裂隙岩体渗流与应力的耦合机理,获得了几种典型情况下的试验数据,并拟合出不同应力条件下单裂隙岩体渗流量与应力间数学经验公式。从而说明并非任一方向的应力增加都能使渗流量减小,而是裂隙岩体的渗流量随着双向压应力的增加而减少,随着平行于裂隙面方向的单向压应力的增加而增加。缝隙开度虽然随着法向应力的增加而逐渐减小,但最终不可能完全闭合,所以,此时流量不可能为零。同时,在试验过程中还通过闭环控制来实现被加载面的均匀受力,这为大尺寸岩体试验提供了一种很好的加载方法。 相似文献
44.
For a class of nonlinear filtration equation with nonlinear second-third boundary value condition, it is shown that a priori boundary of the solution can be estimated and controlled by initial data and integral on the boundary of the region. The priori estimate of the solutions was established by iterative method. By using this estimate the solutions may blow-up on the boundary of the region and thus it may have asymptotic non-stability. 相似文献
45.
V. N. Zyryanov 《Fluid Dynamics》2005,40(6):885-896
Using the method of matched asymptotic expansions, an analytical solution of the balance equation for turbulence energy is constructed for a shallow basin (sea) in which the fluid depth does not exceed the Stokes layer thickness. In this case, a gradient-viscous balance is established with the turbulent viscosity being balanced mainly by the pressure gradient. It is shown that nonlinear boundary layers attributable to turbulence energy diffusion are formed near the bottom and the free surface (or ice). In the neighborhood of the point of maximum flow velocity (if this maximum is attained inside the flow), a nonlinear internal boundary layer also develops. Outside these layers, the turbulence energy generation is in the first approximation balanced by the energy dissipation. Asymptotic solutions for the boundary layers are constructed. 相似文献
46.
A UNIFORMLY CONVERGENT DIFFERENCE SCHEME FOR THE SINGULAR PERTURBATION PROBLEM OF A HIGH ORDER ELLIPTIC DIFFERENTIAL EQUATION 总被引:1,自引:0,他引:1
AUNIFORMLYCONVERGENTDIFFERENCESCHEMEFORTHESINGULARPERTURBATIONPROBLEMOFAHIGHORDERELLIPTICDIFFERENTIALEQUATION(刘国庆)(苏煜城)AUNIFO... 相似文献
47.
Velocity profile measurement by ultrasonic doppler method 总被引:11,自引:0,他引:11
Yasushi Takeda 《Experimental Thermal and Fluid Science》1995,10(4):444-453
The ultrasonic velocity profile measuring method has been developed at PSI for application in fluid mechanics and fluid flow measurement. It uses pulsed ultrasonic echography together with the detection of the instantaneous Doppler shift frequency. This method has the following advantages over the conventional techniques: (1) an efficient flow mapping process, (2) applicability to opaque liquids, and (3) a record of the spatiotemporal velocity field. After a brief introduction of its principle, the characteristics and specifications of the present system are given. Then examples in fluid engineering for oscillating pipe flow, T-branching flow of mercury, and recirculating flow in a square cavity are described that confirm the method's advantages. Several other works under way by other investigators are introduced. A potential for in-depth study of fluid dynamics is demonstrated by several examples from an investigation of modulated wavy flows in a rotating Couette system. The position-averaged power spectrum and the time-averaged energy spectral density were used to study the dynamic characteristics of the flow, and subsequently the velocity field was decomposed into its intrinsic wave structure based on two-dimensional Fourier analysis. 相似文献
48.
化学跑合剂对跑合效果的影响 总被引:1,自引:2,他引:1
在BJ52A胶合试验机、JP-BD1500型接触疲劳试验机和CL-100齿轮试验机上考察了化学跑合剂的作用,并就其机理进行了探讨。结果表明:采用化学跑合剂跑合后,表面粗糙度明显降低;表面接触面积增大,可以实现1次满载快速跑合;与采用含磨料的跑合方法比较,化学跑合剂可以明显提高表面接触精度,减少裂纹源的发生和发展,使表面承载能力明显提高。当齿轮加工精度较低或高速、重载齿轮的硬齿面精加工存在困难时,可 相似文献
49.
Ki Byung Sunwoo Seung Joon Park Seong Jae Lee Kyung Hyun Ahn Seung Jong Lee 《Rheologica Acta》2002,41(1-2):144-153
Three-dimensional numerical simulation of viscoelastic coextrusion process has been performed and numerical results were
compared with the experimental data of Karagiannis et al. (1990). By varying the magnitude of the second normal stress difference
and its ratio of Fluid I and Fluid II, we were able to control the interface profile and the degree of encapsulation along
the downstream direction. By increasing the parameter α (αFluid I=αFluid II) from 0.1 to 0.4 in the Giesekus model and increasing the α ratio (αFluid IαFluid II) between Fluid I and Fluid II from 2.0 to 4.0 in the permissible range of realistic polymeric systems, the interface profile
and the degree of encapsulation along the downstream direction were fitted with the experimental results. There was little
difference between the numerical results and the experimental data in the interface profile and the degree of encapsulation
along the downstream direction when the α ratio was set to 3.0 (0.3:0.1). Fluid I with larger magnitude of the second normal
stress difference protrudes into Fluid II with smaller magnitude of the second normal stress difference around the symmetric
plane, while Fluid II wraps around Fluid I near the side walls. As the ξ
1
ratio (ξ
1
,Fluid Iξ
1
,Fluid II) increases from 1.0 to 3.0 for the two-mode Phan-Thien and Tanner model, it was found that the curvature of the interface
profile increased, and the difference between the numerical results and the experimental data in the interface profile and
the degree of encapsulation along the downstream direction was almost negligible when the ξ
1
ratio was set to 3.0 (0.54:0.18). Although the parameters of viscoelastic models were fitted by using the shear viscosity
data only, quantitative agreements between the numerical results and the experimental coextrusion data were quite satisfactory.
Received: 24 April 2001 Accepted: 5 June 2001 相似文献
50.
Pumpkin seed oil (PSO), which is a valuable compound with high nutritional value used for the prevention of various chronic diseases, is prone to oxidation. In this work, small and uniform (su) ovalbumin (OVA) and pectin (PEC) were used to stabilize PSO in the form of an emulsion. The results showed that suOVA-PEC-PSO emulsion with a droplet size of 9.82 ± 0.05 μm was successfully self-assembled from PSO, PEC, and suOVA solution (with a droplet size of 230.13 ± 14.10 nm) treated with 300 W ultrasound, owing to the formation of a more stable interfacial film on the surface of droplets. The interfacial, rheological, emulsifying, and antioxidant properties of the suOVA-PES-PSO emulsions were excellent, owing to the synergistic effects between PEC and suOVA solution. Moreover, the physical stability of the suOVA-PEC-PSO emulsions to salt stress, a freeze-thaw cycle, and heat treatment was also increased and the oxidation of linolenic acid was notably delayed. These results have extended the food-related applications of OVA and PSO, and provide a promising foundation for further exploration of the self-assembly of composite emulsions by small and uniform proteins. 相似文献