全文获取类型
收费全文 | 1103篇 |
免费 | 58篇 |
国内免费 | 68篇 |
专业分类
化学 | 77篇 |
力学 | 409篇 |
综合类 | 11篇 |
数学 | 201篇 |
物理学 | 531篇 |
出版年
2024年 | 3篇 |
2023年 | 14篇 |
2022年 | 21篇 |
2021年 | 24篇 |
2020年 | 34篇 |
2019年 | 16篇 |
2018年 | 18篇 |
2017年 | 31篇 |
2016年 | 31篇 |
2015年 | 43篇 |
2014年 | 34篇 |
2013年 | 51篇 |
2012年 | 44篇 |
2011年 | 75篇 |
2010年 | 70篇 |
2009年 | 72篇 |
2008年 | 73篇 |
2007年 | 50篇 |
2006年 | 61篇 |
2005年 | 63篇 |
2004年 | 69篇 |
2003年 | 58篇 |
2002年 | 34篇 |
2001年 | 35篇 |
2000年 | 36篇 |
1999年 | 24篇 |
1998年 | 22篇 |
1997年 | 17篇 |
1996年 | 14篇 |
1995年 | 18篇 |
1994年 | 11篇 |
1993年 | 8篇 |
1992年 | 8篇 |
1991年 | 3篇 |
1990年 | 10篇 |
1989年 | 8篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1979年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有1229条查询结果,搜索用时 15 毫秒
201.
热管冷却核反应堆具有非能动传热、模块化和固有安全性高等特点,在航空探索、深海作业和偏远地区电力市场上有广泛的应用。以洛斯阿拉莫斯国家实验室开发的5 MWth热管堆为研究对象,选择SS-316,Mo-14Re和SiC作为基体候选材料,采用反应堆蒙特卡罗中子输运分析程序对比分析了以上三种基体堆芯的反应性、中子能谱、增殖性能和燃耗演化。结果表明:为了维持堆芯的10年运行,SS-316,Mo-14Re和SiC三种基体堆芯所需的初始燃料235U富集度分别约为19.35%,28.80%和17.10%,SiC基体堆芯所需的初始燃料235U富集度最小;10年后,SiC基体堆芯产生的易裂变核素(239Pu和241Pu)和次锕系核素(通过分离嬗变可被再次利用)的量最高,分别约为11.91 kg和92.08 g。综合以上研究结果,推荐SiC作为热管冷却核反应堆的基体。 相似文献
202.
Experimental results for various water and air superficial velocities in developing adiabatic horizontal two-phase pipe flow are presented. Flow pattern maps derived from videos exhibit a new boundary line in intermittent regime. This transition from water dominant to water–gas coordinated regimes corresponds to a new transition criterion CT = 2, derived from a generalized representation with the dimensionless coordinates of Taitel and Dukler.Velocity, turbulent kinetic energy and dissipation rate, void fraction and bubble size radial profiles measured at 40 pipe diameters for JL = 4.42 m/s by hot film velocimetry and optical probes confirm this transition: the gas influence is not continuous but strongly increases beyond JG = 0.06 m/s. The maximum dissipation rate, derived from spectra, is increased in two-phase flow by a factor 5 with respect to the single phase case.The axial evolution of the bubble intercept length histograms also reveal the flow organization in horizontal layers, driven by buoyancy effects. Bubble coalescence is attested by a maximum bubble intercept evolving from 2.5 to 4.5 mm along the pipe. Turbulence generated by the bubbles is also manifest by the 4-fold increase of the maximum turbulent dissipation rate along the pipe. 相似文献
203.
Supersymmetric heterotic string models, built from a Calabi-Yau threefold X endowed with a stable vector bundle V, usually start from a phenomenologically motivated choice of a bundle Vv in the visible sector, the spectral cover construction on an elliptically fibered X being a prominent example. The ensuing anomaly mismatch between c2(Vv) and c2(X), or rather the corresponding differential forms, is often ‘solved’, on the cohomological level, by including a fivebrane. This leads to the question whether the difference can be alternatively realized by a further stable bundle. The ‘DRY’-conjecture of Douglas, Reinbacher and Yau in math.AG/0604597 gives a sufficient condition on cohomology classes on X to be realized as the Chern classes of a stable sheaf. In 1010.1644 [hep-th], we showed that infinitely many classes on X exist for which the conjecture is true. In this note, we give the sufficient condition for the mentioned fivebrane classes to be realized by a further stable bundle in the hidden sector. Using a result obtained in 1011.6246 [hep-th], we show that corresponding bundles exist, thereby confirming this version of the DRY-Conjecture. 相似文献
204.
在内径为2mm曲率为0.057的螺旋管内进行了超临界氮的对流换热实验,研究探讨了螺旋管入口温度、壁面热流密度对沿程壁面温度分布以及平均换热系数的影响,与前人关于螺旋管内常规流体流动换热的平均Nu的经验关系式进行了比较。并基于FLUENT软件进行了数值计算,并与实验结果进行了比较。分析表明,数值计算对壁面温度的预测有一定的适用性。 相似文献
205.
文中针对三维坐标系下,圆翅片叉排热管散热器的流动和传热特性进行数值模拟研究。分析了三个主要影响因素:翅片间距、翅片厚度和排间距对平均换热系数、流动摩擦系数和热阻的影响。翅片间距分别为6mm、7mm和8mm,翅片厚度分别为0.8mm、1mm和1.2mm,排间距分别为21.7mm、23mm和24.3mm。模拟结果表明:随着迎面风速增加,摩擦系数减小,传热热阻减小;随着翅片厚度的增加,摩擦系数减小、换热能力增强,热阻在大Re时增大明显。随着翅片间距的增大,摩擦系数增大,换热能力提高,热阻增大;随着排间距的增大,摩擦系数在正三角形管排布时的值上下变动,且只有排间距显著增大时,换热能力和热阻才会增大。 相似文献
206.
J. Castillo Montes D. CadouxJ. Creus S. TouzainE. Gaudichet-Maurin O. Correc 《Polymer Degradation and Stability》2012,97(2):149-157
In France, hot water quality control inside buildings is occasionally assured by disinfection treatments using sodium hypochlorite (between 0.5 and 1 ppm residual free chlorine). This disinfectant is a strong oxidizer and it could interact with metallic and polymer pipes used in hot water systems. To assess the long-term performance of these pipes, it is then necessary to study the impact of these treatments on the material behaviour, in particular for polymeric materials, even at relatively low disinfectant concentrations as used in potable water treatments. The objective of this work was to study the influence of sodium hypochlorite concentration on PERT/Al/PERT (PolyEthylene Raised Temperature) pipe degradation. Pipe samples were filled with chlorinated water solutions (concentrations ranging between 0 and 100 ppm) and maintained in static conditions during 270 days at 70 °C. The antioxidant depletion profile through a PERT wall was monitored using the oxidation induction time (OIT) method, which is a conventional technique of Differential Scanning Calorimetry. Chemical changes on the aged polymer were checked by Infrared Spectrometry. OIT change showed that the PERT stabilizing system was rapidly chemically consumed by the action of chlorinated water at 25 and 100 ppm concentrations. However, PERT degradation was strictly confined to the immediate inner wall. Only a 0.3 mm thick layer (inner part of the pipe) showed significant antioxidant depletion. An increase of the OH and C-O-C infrared bands was also observed on inner part of any samples during ageing which characterize the oxidation of the PERT on the inner wall. 相似文献
207.
《Journal of Coordination Chemistry》2012,65(24):2731-2738
Three kinds of trinuclear metal string complexes, [Ni3(dpa)4(L1)2]?·?H2O?·?C2H5OH (L1?=?(E)-3-(2-hydroxyl-phenyl)-acrylic acid) (1), [Ni3(dpa)4(L2)2]?·?2C2H5OC2H5 (L2?=?(E)-3-(3-hydroxyl-phenyl)-acrylic acid) (2) and [Ni3(dpa)4(L3)2]?·?3CH2Cl2?·?1.5CH3OH (L3?=?(E)-3-(4-hydroxyl-phenyl)-acrylic acid) (3). (dpa??=?bis(2-pyridyl)amido), have been synthesized. The structures of 1 and 2 have been analyzed by the X-ray single-crystal diffraction showing hydrogen-bonded networks. 相似文献
208.
This paper is devoted to slip phenomenon between the phases that occurs in unstable two-phase water–oil flow systems in a horizontal pipe. The emphasis is placed on the relation between the slip and the real (in situ) water fraction in a flowing mixture, as well as the substitute physical properties of the whole two-phase system. The experimental data collected throughout research served for the evaluation of the accuracy of the methods of real phase fraction in a water–oil flow system in horizontal pipes as they were referred to in the bibliography. Subsequently we have suggested the author indicate a method of determination of the fraction for two-phase liquid systems like O/W, W/O and W + O. In order to establish the specific equations, the drift-flux model has been used here. 相似文献
209.
210.
Anirudh Pradhan 《理论物理通讯》2009,51(2):367-374
Some cylindrically symmetric inhomogeneous viscous fluid string cosmological models with magnetic field and cosmological term A varying with time are investigated. To get the deterministic solution, it has been assumed that the expansion (θ) in the model is proportional to the eigen value σ^11 of the shear tensor σ^ij. The value of cosmological constant for the model is found to be small and positive, which is supported by the results from recent supernovae Ia observations. The effect of bulk viscosity is to produce a change in perfect fluid and hence exhibits essential influence on the character of the solution. The physical and geometric properties of the models are also discussed in presence and absence of magnetic field. 相似文献