全文获取类型
收费全文 | 205764篇 |
免费 | 15375篇 |
国内免费 | 7809篇 |
专业分类
电工技术 | 11244篇 |
技术理论 | 14篇 |
综合类 | 11216篇 |
化学工业 | 35700篇 |
金属工艺 | 10546篇 |
机械仪表 | 12003篇 |
建筑科学 | 16409篇 |
矿业工程 | 4944篇 |
能源动力 | 5849篇 |
轻工业 | 12687篇 |
水利工程 | 3211篇 |
石油天然气 | 11074篇 |
武器工业 | 1346篇 |
无线电 | 25484篇 |
一般工业技术 | 26720篇 |
冶金工业 | 10937篇 |
原子能技术 | 2114篇 |
自动化技术 | 27450篇 |
出版年
2024年 | 881篇 |
2023年 | 3262篇 |
2022年 | 5829篇 |
2021年 | 7931篇 |
2020年 | 5797篇 |
2019年 | 5012篇 |
2018年 | 5415篇 |
2017年 | 6202篇 |
2016年 | 5695篇 |
2015年 | 7292篇 |
2014年 | 9520篇 |
2013年 | 12270篇 |
2012年 | 12227篇 |
2011年 | 13876篇 |
2010年 | 11610篇 |
2009年 | 11463篇 |
2008年 | 10874篇 |
2007年 | 10468篇 |
2006年 | 10858篇 |
2005年 | 9631篇 |
2004年 | 6563篇 |
2003年 | 5778篇 |
2002年 | 5252篇 |
2001年 | 4723篇 |
2000年 | 4870篇 |
1999年 | 5638篇 |
1998年 | 5283篇 |
1997年 | 4351篇 |
1996年 | 3956篇 |
1995年 | 3310篇 |
1994年 | 2768篇 |
1993年 | 2187篇 |
1992年 | 1700篇 |
1991年 | 1277篇 |
1990年 | 1018篇 |
1989年 | 877篇 |
1988年 | 681篇 |
1987年 | 496篇 |
1986年 | 394篇 |
1985年 | 334篇 |
1984年 | 212篇 |
1983年 | 198篇 |
1982年 | 163篇 |
1981年 | 145篇 |
1980年 | 131篇 |
1979年 | 97篇 |
1978年 | 63篇 |
1977年 | 63篇 |
1976年 | 77篇 |
1975年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
201.
氮化硅的性能及其聚合物材料 总被引:1,自引:0,他引:1
陈继兰 《高分子材料科学与工程》1996,12(6):144-147
叙述了氮化硅(Si3N4)的性能并制备了含Si3N4的聚合物材料,这种材料在医学上具有重要价值,对改变医学方面的概念、和对促进人类健康长寿具有重要意义。 相似文献
202.
203.
AO Güre NK Altorki E Stockert MJ Scanlan LJ Old YT Chen 《Canadian Metallurgical Quarterly》1998,58(5):1034-1041
Supplementation with high doses of alpha-tocopherol has increased the oxidation resistance of LDL in many clinical trials. There have been only a few placebo-controlled trials in healthy persons of alpha-tocopherol doses usually contained in dietary supplements. We carried out a single-blind, placebo-controlled, randomized trial to examine the effect of 200 mg RRR-alpha-tocopheryl acetate/d on the oxidation resistance of atherogenic lipoproteins (VLDL+LDL including intermediate-density lipoproteins) in 40 smoking men. VLDL+LDL oxidation resistance was assessed as conjugated dienes after copper induction and hemin degradation after hydrogen peroxide induction. Also, the LDL total peroxyl-radical trapping antioxidant parameter (LDL TRAP) and plasma malondialdehyde were measured at baseline and after 2 mo of supplementation. Plasma RRR-alpha-tocopherol concentrations were measured at 2-h intervals for 12 h at baseline and after 2 mo of supplementation. Compared with placebo, 200-mg RRR-alpha-tocopheryl acetate supplementation elevated plasma and VLDL+LDL alpha-tocopherol concentrations, LDL TRAP, and oxidation resistance of VLDL+LDL. Plasma alpha-tocopherol increased by 88% (P < 0.0001), VLDL+LDL alpha-tocopherol increased by 90% (P < 0.0001), and LDL TRAP by 58% (P < 0.0001). The time to the start of oxidation (lag time) was prolonged by 34% when assessed with a copper-induced method and by 109% when assessed with a hemin + hydrogen peroxide-induced method; the time to maximal oxidation was prolonged by 21% (copper-induced method) in the vitamin E-supplemented group. Changes in plasma alpha-tocopherol, lipid-standardized alpha-tocopherol, and VLDL+LDL alpha-tocopherol correlated significantly with changes in LDL TRAP, lag time, and time to maximal oxidation. Differences in changes between groups in the area under the curve for plasma alpha-tocopherol were significant (P < 0.009). Our results suggest that 200 mg oral RRR-alpha-tocopheryl acetate/d had a clear effect on the in vitro oxidation of VLDL+LDL in smoking men. 相似文献
204.
ATM技术能否在数据通信网中广泛采用取决于其是否能高效地支持现有业务,其中主要为非连接业务。本文介绍了几种基于ATM 的非连接业务支持方式和协议体系结构,对其进行了评述并对IP分组到ATM信元的封装效率进行了分析。 相似文献
205.
Gilbert A. Hartley Ahmed Abdel-Akher Peilei Chen 《International journal for numerical methods in engineering》1992,35(9):1771-1785
Procedures are described for modelling a structural system consisting of thin Kirchhoff plates with internal patch areas capable of displacing as rigid flat surfaces. The physical prototype for these patches could be interconnection points for one-dimensional frame type elements of various shapes and layout, rigidly connected at these finite size 'joints' in the plate. The numerical procedure for modelling the thin plate is the Direct Boundary Element Method (DBEM) and a simple overview of this procedure is provided. Potential trouble spots, of which the user should be aware, are described. The paper will be of interest to structural engineers for analysis of frames having both plate and simple frame elements, for example, building frames; and also to researchers seeking the greater detail that this refined procedure can provide. As a practical tool, the methods described are computationally competitive with existing procedures, including the more rugged approaches used by building structural engineers for dynamic and torsional analysis. 相似文献
206.
In order to cumpare the peformance of different supply diffuers of ventilation air, the airflow passern, temperature stratifiation and contaminant dispersion in a furnitured office ventilated by three kinds of air diffuer were numerically investigated. The air diffuers studied in this paper are a quarter-cylinder displacement diffuer on the floor and mixing diffuers (linear and vortex diffuers) on the ceiling. The heat sources in the of-fice are considered to be 50% convective and 50% radiative. The k-? two-equatwn model of turbulence is employed to predict the turbulent diffusion. The results show that the displacement diffuser provides a rather uniform flow field with low velocify in most areas, and the vertical temperature difference from floor to ceiling is as high as 6 K. With the linear diffuser, the air velociry is high, and the temperature is uniform both horizontally and vertically. The air velocity generated by the vortex diffuser is moderate. The distributions of the temperature and the contaminant are rather uniform. 相似文献
207.
基数排序由于其效率高而被广泛应用。通常,基数排序所用的基数是10,然而,如果求得一个基数r_(best),并且用r_(best)为基数进行基数排序使排序时间达到最小,则这将具有非常重要的意义。本文给出了求r_(best)的方法,分析了以r_(best)为基数进行基数排序的时间复杂度,提出了进一步提高效率的措施,并将以r_(best)为基数的基数排序速度与以10为基数的基数排序进行了比较。 相似文献
208.
基于神经网络的降雨径流预报 总被引:2,自引:0,他引:2
本文将人工神经网络应用于二滩水电站以上支流鱼河的降雨径流预报,通过建模、计算、比较和分析可知,其非线性映射能力、自学习能力和灵活性,均能较好地反映降雨径流之间的非线性的、复杂的转换关系,结合流域水文特性并合理处理建模数据,值得进一步深入研究。 相似文献
209.
The augmented drift-diffusion current equation, which includes velocity overshoot effects through the space derivatives of the electric field, cannot be directly extended beyond one dimension. A new formalism is developed which considers the carrier heating and the distribution relaxation effects to obtain a multidimensional augmented drift diffusion current equation. The equivalent mobility containing the velocity overshoot correction is derived from the perturbation analysis on the carrier temperature using the energy balance equation. The issues related to the numerical implementation of this generalized model and the validity of the assumptions are also discussed 相似文献
210.
将空气中烧成的镍导体用于散热制冷片制作工艺中,可降低成本,提高合格率。通过实验得到的最佳值为:镍导体中4号玻璃(SiO2>30,B2O3>10,PbO<55,TiO2少许)的含量4.5%,化学镀镍时间50min,方阻47.5mΩ/□,附着力8.1N/mm2。 相似文献