全文获取类型
收费全文 | 9617篇 |
免费 | 329篇 |
国内免费 | 106篇 |
专业分类
电工技术 | 231篇 |
综合类 | 193篇 |
化学工业 | 1868篇 |
金属工艺 | 350篇 |
机械仪表 | 354篇 |
建筑科学 | 346篇 |
矿业工程 | 103篇 |
能源动力 | 325篇 |
轻工业 | 593篇 |
水利工程 | 107篇 |
石油天然气 | 156篇 |
武器工业 | 16篇 |
无线电 | 1093篇 |
一般工业技术 | 2164篇 |
冶金工业 | 1122篇 |
原子能技术 | 107篇 |
自动化技术 | 924篇 |
出版年
2023年 | 91篇 |
2022年 | 170篇 |
2021年 | 221篇 |
2020年 | 187篇 |
2019年 | 147篇 |
2018年 | 248篇 |
2017年 | 198篇 |
2016年 | 214篇 |
2015年 | 201篇 |
2014年 | 263篇 |
2013年 | 569篇 |
2012年 | 377篇 |
2011年 | 447篇 |
2010年 | 383篇 |
2009年 | 365篇 |
2008年 | 359篇 |
2007年 | 328篇 |
2006年 | 306篇 |
2005年 | 259篇 |
2004年 | 234篇 |
2003年 | 215篇 |
2002年 | 200篇 |
2001年 | 171篇 |
2000年 | 217篇 |
1999年 | 225篇 |
1998年 | 301篇 |
1997年 | 261篇 |
1996年 | 233篇 |
1995年 | 195篇 |
1994年 | 181篇 |
1993年 | 170篇 |
1992年 | 148篇 |
1991年 | 151篇 |
1990年 | 101篇 |
1989年 | 107篇 |
1988年 | 113篇 |
1987年 | 110篇 |
1986年 | 90篇 |
1985年 | 128篇 |
1984年 | 121篇 |
1983年 | 134篇 |
1982年 | 98篇 |
1981年 | 96篇 |
1980年 | 84篇 |
1979年 | 89篇 |
1978年 | 75篇 |
1977年 | 66篇 |
1976年 | 72篇 |
1975年 | 57篇 |
1974年 | 54篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Uma Maheswar Rao S. S. M. S. Abdul Majeed C. Venkataseshaiah R. Sarathi 《Bulletin of Materials Science》2002,25(6):473-475
In the present work, tracking phenomena has been studied with silicone rubber material under the a.c. and d.c. voltages following
IEC-587 standards. The surface condition of the tracked zone was analysed using wide angle X-ray diffraction (WAXD) and thermogravimetric
differential thermal analysis (TG-DTA) studies. The tracking time was different for a.c. and d.c. voltages. 相似文献
32.
This paper draws attention to the basic principles governing reflections in uniform Bragg reflectors (BR) when measured employing optical low coherence reflectometry (OLCR) technique. Using computations based on transfer matrix method (TMM), we first showed a strong spectral dependence of Bragg reflectograms on an OLCR probe spectrum. Later, this dependence is exploited to evaluate, for the first time, the coupling coefficient κ of a Bragg grating in a distributed Bragg reflector (DBR) laser on InP 相似文献
33.
34.
A. Edwards Mulpuri V. Rao B. Molnar A. E. Wickenden W. Holland P. H. Chi 《Journal of Electronic Materials》1997,26(3):334-339
Doping by ion implantation using Si, O, Mg, and Ca has been studied in single crystal semi-insulating and n-type GaN grown
on a-sapphire substrates. The n-and p-type dopants used in this study are Si and O; Mg and Ca, respectively. Room temperature
activation of Si and O donors has been achieved after 1150°C annealing for 120 s. The activation of Mg and Ca acceptors is
too low to measure at both room temperature and 300°C. Using higher doses to achieve a measurable p-type conduction increases
the amount of damage created by the implantation. Rutherford back scattering measurements on this material indicate that the
damage is still present even after the maximum possible heat treatment. Secondary ion mass spectrometry measurements have
indicated a redistribution in the measured profiles of Mg due to annealing. 相似文献
35.
K. T. Venkateswara Rao W. O. Soboyejo R. O. Ritchie 《Metallurgical and Materials Transactions A》1992,23(8):2249-2257
A study has been made of the role of ductile-phase toughening on the ambient temperature fracture toughness and fatigue-crack
propagation behavior of a molybdenum disilicide intermetallicmatrix composite reinforced with 20 vol pct niobium spheres.
Using disk-shaped compact DC(T) samples, only moderate improvements (∼24 pct) in fracture toughnessK
lcvalues were found for the composite compared to the unreinforced MoSi2 matrix material. Moreover, (cyclic) fatigue- crack propagation was seen at stress intensities as low as 75 to 90 pct ofK
Ic, with growth rates displaying a high dependency (∼14) on the applied stress-intensity range. The lack of significant toughening
due to the incorporation of ductile Nb particles is associated with an absence of crack/particle interactions. This is attributed
to the formation of a weak reaction-layer interface and elastic mismatch stresses at the crack tip between the Nb and MoSi2, both factors which favor interfacial debonding; moreover, the spherical morphology of Nb phase stabilizes cracking around
the particle. Results suggest that increasing the aspect ratio of the distributed Nb rein- forcement phase with attendant
interfacial debonding and eliminating possible Nb-phase em- brittlement due to interstitial impurity contamination are critical
factors for the successful development of tougher Nb/MoSi2 structural composites.
Formerly with McDonnell
Formerly with McDonnell 相似文献
36.
A trade-off analysis on the cost and system packaging metrics of an electronic product aimed at the commercial/retail industry has been carried out. By comparing the system cost and packaging metrics with those of comparable consumer products, we have determined that there is opportunity for significant cost, size, and weight reduction of the overall electronics packaging system. These include the use of fine pitch IC packages, smaller discrete components, denser PCB wiring technology, double sided IC package surface mount, surface mount connectors, and improved plastics for the product housing. The analysis concluded that PCB area reduction of 40%, using a single PCB instead of three boards, reduction in board cost of over 50% and product weight reduction of over 28% are possible using available technologies. 相似文献
37.
A semi-quantitative right coronary artery score (RCA score) was derived from the ratio of the number of the major left ventricular branches of the right coronary artery to the total of the right coronary and left circumflex arteries, to stratify the extent of perfusion in patients with right coronary artery dominance. Thirty-seven patients with one-vessel coronary disease involving a dominant right coronary artery proximal to the left ventricular branches were selected for study. Thallium scintigraphy was performed after right intracoronary injection in 11 patients, and 26 patients underwent conventional stress thallium scintigraphy (24 exercise thallium and two dipyridamole thallium scintigraphy). Thallium scores of perfusion region size after right intracoronary thallium injection and perfusion defect size in stress thallium studies were quantitated from planar thallium images. Both the RCA score and the regional thallium scores spanned over a wide range. The RCA score (range 0.23-0.85) correlated best with the posterior (70 degrees left anterior oblique view) plus lateral segment (40 degrees left anterior oblique view) thallium score (r = 0.88 and 0.53 for intracoronary and stress thallium studies respectively). It also correlated with the summed thallium scores in the posterior, lateral, apical and inferior segments (r = 0.73 and 0.54 respectively) but not with thallium scores in the apex or inferior segment alone. The proposed RCA score quantitates the variable posterolateral perfusion territory of the right coronary artery, and could stratify the area of myocardium at risk from coronary stenosis in the majority of patients with right coronary dominance. 相似文献
38.
研究了气氛加压烧成ZrO2(Y-TZP)-Si3N4复合材料中抑制ZrN生成工艺问题,相组成分析表明:无论添加20wt%工业ZrO2或者Y-TZP(3mol%Y。O。)的氯化硅复合材料,在低于1850℃,3MPak气压力下烧成,表面无ZrN生成.通过加入有效的烧结助剂(Y。Oa+AI。Os)、增加埋粉中SIO分压以及增加保护气氛氮气压力,适当的烧成条件等工艺措施可有效地抑制ZrN的生成.实验还证实了ZrN很容易氧化,含有ZrN的ZrO。(Y-TZP)-SisN。复合材料试样经900℃,0.sh热处理已粉碎性裂开. 相似文献
39.
40.
Barium copper oxalate was grown in silica hydrogel at ambient temperature. The effect of various parameters like gel pH, gel
density, gel aging and concentrations of reactants on the growth of these crystals was studied. The crystals grown were characterized
by chemical analysis, X-ray powder diffractometry, infrared spectroscopy, thermogravimetric and differential thermal analysis.
The results of these observations are described and discussed. 相似文献