全文获取类型
收费全文 | 36331篇 |
免费 | 5677篇 |
国内免费 | 3149篇 |
学科分类
工业技术 | 45157篇 |
出版年
2024年 | 84篇 |
2023年 | 558篇 |
2022年 | 1273篇 |
2021年 | 1358篇 |
2020年 | 1486篇 |
2019年 | 1126篇 |
2018年 | 1115篇 |
2017年 | 1454篇 |
2016年 | 1727篇 |
2015年 | 1753篇 |
2014年 | 2462篇 |
2013年 | 2378篇 |
2012年 | 3292篇 |
2011年 | 3237篇 |
2010年 | 2382篇 |
2009年 | 2443篇 |
2008年 | 2136篇 |
2007年 | 2752篇 |
2006年 | 2383篇 |
2005年 | 1942篇 |
2004年 | 1573篇 |
2003年 | 1237篇 |
2002年 | 951篇 |
2001年 | 838篇 |
2000年 | 630篇 |
1999年 | 474篇 |
1998年 | 378篇 |
1997年 | 335篇 |
1996年 | 278篇 |
1995年 | 222篇 |
1994年 | 214篇 |
1993年 | 139篇 |
1992年 | 138篇 |
1991年 | 83篇 |
1990年 | 83篇 |
1989年 | 48篇 |
1988年 | 24篇 |
1987年 | 27篇 |
1986年 | 22篇 |
1985年 | 7篇 |
1984年 | 14篇 |
1983年 | 7篇 |
1982年 | 13篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 13篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1959年 | 10篇 |
1951年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
深凹露天矿山由于其特殊的结构,爆破产生的炮烟扩散稀释较为困难,严重危害生产作业人员的生命安全与健康。基于实际矿山构建了深凹露天矿山的二维物理及数学模型,采用非稳态数值分析方法研究了不同爆破位置下,深凹露天矿山采坑内爆破炮烟的扩散规律。研究结果表明:不同爆破位置下,露天采坑内均出现复环流,爆破点位置是影响露天采坑内风流结构特征的重要因素;露天采坑内的炮烟最高浓度均随着时间变化而逐渐下降,但下降的速率逐步减小,呈现三个阶段的下降趋势;爆破位置位于背风侧时露天采坑内的炮烟最高浓度和降至安全浓度所需时间远高于迎风侧三个爆破位置;随着背风侧爆破点距采坑底部距离的减小,炮烟最高浓度及降至安全浓度所需时间先降低后增加,炮烟最高浓度及降至安全浓度所需时间随着迎风侧爆破位置距采坑底部距离的减小而增加。研究结果对于指导深凹露天矿山企业合理组织爆破后的生产作业和保障作业人员安全具有重要意义。 相似文献
3.
4.
以H型垂直轴风力机及其内含圆柱形实体为研究对象,对NACA0018翼型的五叶片H型垂直轴风力机的气动性能进行数值模拟和实验验证。分析8种不同直径的内含圆柱体,在内含实体截面积占风轮迎风面积之比分别为21.2%、50.0%和76.9%时,风力机风能利用率的峰值分别下降8.04%、20.7%及74.3%。结果表明:随着内含实体直径的增大,风能利用率的峰值逐渐减小,开始较为缓慢,达到一定值时快速下降。小直径内含实体主要影响叶片在下风区的转矩,对风能利用率的影响较小,而大直径内含实体还会影响叶片在上风区的转矩,其风能利用率迅速减小。对于内含固定直径的实体,比如在现有建筑物外侧安装风力机时,其风轮半径的选择需综合考虑风能利用率和风力机的建造成本两方面的因素。研究结果可为建筑物与垂直轴风力机进行有效结合以提高风能的利用提供参考。 相似文献
5.
In the present work, the heating performance of a new system combined with a new modified baseboard radiator and fan coil is investigated. Using longitudinal fins with special geometry and also forced airflow at the end of the system causes that at the lower inlet water temperature compared with the conventional models, higher heat output rate be obtained. The heat output rate of the new modified system is obtained by experimental metrology based on the European Standard No. EN-442. Temperature and velocity distribution in the room space is done by simulation of the modified system in the Flovent software. Computational fluid dynamics (CFD) results are validated against experimental results and there is a good agreement between them. Also, the energy consumption of the system during the winter season is calculated in TRANSYS software. Experimental results show that the heat output rate of a new modified heating system with inlet water temperature in the range of 45–55°C is on average 4.17 times higher compared with the conventional model. CFD simulation also showed that the combined system provides good thermal comfort conditions. Energy consumption of the new system reduced about 13% compared with conventional models. 相似文献
6.
For proton-exchange membrane fuel cells, the distribution of reactant flow in the stack is critical to the fuel cell's efficiency. The uneven distribution of reactant flow in the stack may cause poor current density, low performance, and material degradation. To understand and accurately predict the flow field in the proton-exchange membrane fuel cell system, the present study aims to develop a simple correlation to analyze the pressure drop in fuel cell stacks. The flow channel in each cell of a stack is treated as a porous medium, and a power-law model is used to approximate the porous medium momentum source term. For the stacks with fewer cell numbers, namely, 1, 5, and 10 cells, the parameters in the power law are established based on the experimental data. Then, a correlation is developed to simulate the flow and predict the pressure drop in the stack with higher cell numbers (ie, 20 and 40 cells). The simulations show that the pressure drop in each cell of a stack is almost invariable, and the average pressure drop decreases with increasing the number of cells. The flow uniformity in the stacks with different cell numbers is evaluated using the dimensionless pressure drop and the pressure drop ratios. It suggests that the lower the cell number, the more uniform the pressure drop. The developed model is conducive to efficiently designing the flow channel for a fuel cell stack with large cell numbers. 相似文献
7.
基于CFD?DEM耦合方法,研究了颗粒在水室内的流动状态,分析了不同刀盘转速、粒子水通入量和水室出口角度对造粒过程的影响,发现提高刀盘转速、增加粒子水通入量和水室出口倾斜一定的角度都有利于水室内颗粒的排出。进一步研究了颗粒与碎屑在水室内的流动,发现在水室出口处二者的流动基本呈现出一定的分离角度。 相似文献
8.
《International Journal of Hydrogen Energy》2022,47(58):24398-24405
The electronic structures of Zr8Co8 and its hydrides have been systematically investigated using the first-principles calculation based on density functional theory. Additionally, the influence of the Ti and Hf doping on the atomic bonding properties of Zr8Co8 and its hydrides (Zr7HfCo8, Zr7HfCo8H, Zr16Co15HfH48, Zr7TiCo8, Zr7TiCo8H, and Zr16Co15TiH48 compounds) were also studied to provide new insights into the hydrogenation of Zr8Co8. The Ti and Hf atoms were occupied the Zr position in the ZrCo alloy, while they were occupied the Co position in the Zr16Co16H48 system. Ti and Hf doping could achieve the purpose of anti-disproportionation. Ti and Hf could weak the Zr–Co bond for the improvement of the hydrogenation performance of Zr8Co8, and the covalence of the Co–H bond was higher than that of the Zr–H bond. The existence of a Co–H covalent bond in the crystal is conducive to the hydrogen absorption of Zr8Co8 to form Zr16Co16H48. Inhibition of Co–H interaction during Zr8Co8 hydrogenation can accelerate the formation of Zr8Co8H for the improvement of its hydrogenation performance. 相似文献
9.
In the present numerical study, the combined effect of temperature-dependent thermal conductivity, linear thermal radiation, and magnetic effect on shear-thinning tangent hyperbolic fluid past a sensor surface has been studied. After converting the modelled partial differential equations into ordinary differential equations by using similarity transformation, the system of equations is tackled with the aid of the shooting method. The influence of important parameters on the fluid motion and energy distribution is displayed graphically and analyzed in detail. The presented simulations depict that a significant rise in fluid velocity is noticed for an enhancement in the magnetic parameter while an opposite trend is observed for the temperature distribution. Moreover, the skin friction coefficient decreases as the squeezed flow index is increased. 相似文献
10.
随着区域城市人口增加和人民生活水平提高,江淮丘陵区中小河流水环境污染问题日益突出,成为区域社会经济发展的主要制约因素之一。本文以位于江淮丘陵区马槽河流域为研究对象,通过资料收集、问卷调查、实地勘察等手段,查明该地区入河污染物指标 COD、氨氮、TN、TP 主要贡献因素及占比,其中生活污染(51%,40%,54%,28%)、面源污染(6%,38%,9%,42%)、畜禽养殖(39%,15%,17%,25%)三类型贡献占比 90%以上,内源污染和水产养殖较少。针对污染源调查结果特征,提出镇区管网完善、农村分散处理、畜禽粪污处理、养殖废水农田消纳、污染缓冲带设置、径流拦截与再利用、河流生态化改造等治理建议,可为今后中小河流污染源调查与治理提供借鉴。 相似文献