全文获取类型
收费全文 | 926篇 |
免费 | 16篇 |
专业分类
电工技术 | 7篇 |
化学工业 | 209篇 |
金属工艺 | 59篇 |
机械仪表 | 19篇 |
建筑科学 | 28篇 |
矿业工程 | 7篇 |
能源动力 | 16篇 |
轻工业 | 50篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 30篇 |
一般工业技术 | 139篇 |
冶金工业 | 300篇 |
原子能技术 | 7篇 |
自动化技术 | 67篇 |
出版年
2022年 | 6篇 |
2021年 | 11篇 |
2019年 | 10篇 |
2018年 | 6篇 |
2017年 | 9篇 |
2016年 | 13篇 |
2015年 | 11篇 |
2014年 | 25篇 |
2013年 | 20篇 |
2012年 | 18篇 |
2011年 | 30篇 |
2010年 | 17篇 |
2009年 | 27篇 |
2008年 | 25篇 |
2007年 | 22篇 |
2006年 | 23篇 |
2005年 | 26篇 |
2004年 | 18篇 |
2003年 | 12篇 |
2002年 | 21篇 |
2001年 | 22篇 |
2000年 | 14篇 |
1999年 | 25篇 |
1998年 | 105篇 |
1997年 | 56篇 |
1996年 | 52篇 |
1995年 | 29篇 |
1994年 | 22篇 |
1993年 | 26篇 |
1992年 | 16篇 |
1991年 | 7篇 |
1990年 | 13篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 15篇 |
1985年 | 7篇 |
1984年 | 10篇 |
1983年 | 18篇 |
1982年 | 6篇 |
1981年 | 13篇 |
1980年 | 9篇 |
1979年 | 11篇 |
1978年 | 5篇 |
1977年 | 8篇 |
1976年 | 29篇 |
1975年 | 7篇 |
1971年 | 6篇 |
1970年 | 5篇 |
1969年 | 4篇 |
排序方式: 共有942条查询结果,搜索用时 31 毫秒
81.
Purification and crystallization of complexes modeling the active state of the fragile histidine triad protein 总被引:1,自引:0,他引:1
Brenner C; Pace HC; Garrison PN; Robinson AK; Rosler A; Liu XH; Blackburn GM; Croce CM; Huebner K; Barnes LD 《Protein engineering, design & selection : PEDS》1997,10(12):1461-1463
Fragile histidine triad protein (Fhit) is a diadenosine triphosphate
(ApppA) hydrolase encoded at the human chromosome 3 fragile site which is
frequently disrupted in tumors. Reintroduction of FHIT coding sequences to
cancer cell lines with FHIT deletions suppressed the ability of these cell
lines to form tumors in nude mice even when the reintroduced FHIT gene had
been mutated to allow ApppA binding but not hydrolysis. Because this
suggested that the tumor suppressor activity of Fhit protein depends on
substrate-dependent signaling rather than ApppA catabolism, we prepared two
crystalline forms of Fhit protein that are expected to model its
biologically active, substrate-bound state. Wild-type and the His96Asn
forms of Fhit were overexpressed in Escherichia coli, purified to
homogeneity and crystallized in the presence and absence of ApppA and an
ApppA analog. Single crystals obtained by vapor diffusion against ammonium
sulfate diffracted X-rays to beyond 2.75 A resolution. High quality native
synchrotron X-ray data were collected for an orthorhombic and a hexagonal
crystal form.
相似文献
82.
83.
The influence of a fat-free diet on the molecular species composition of phosphatidylcholine (PC), phosphatidylethanolamine (PE), and phosphatidylinositol (PI) of rat liver microsomes was studied by using reversed-phase high-pressure liquid chromatography. In the three phosphoglyceride classes analyzed, the fat-free diet produced a large decrease in the 18:0/20:4n-6 species but less important changes were found in the 16:0/20:4n-6 species. In PC, the most abundant phosphoglyceride class of rat liver microsomes, the fall in the 18:0/20:4n-6 species was counterbalanced mainly by an enhancement in the 16:0/18:1n-9 species although it was not evident in PE. In PI, the decrease in the 18:0/20:4n-6 species was counterbalanced by an increase in the 18:0/20:3n-9 species. Fluorescence polarization measurements of 1,7-diphenyl-1,3,5-hexatriene in liposomes of 16:0/18:1n-9, 18:0/18:1n-9-, 16:0/20:4n-6-, and 18:0/20:4n-6-PC indicated that the change in the saturated fatty acid in the sn-1 position accompanying the replacement of 20:4n-6 by 18:1n-9 could be very important for a homeoviscous compensation, maintaining the membrane physical properties without large alterations in spite of the essential fatty acid deficiency due to the fat-free diet. 相似文献
84.
85.
The introduction of carbon charges on the use of fossil fuels in China would have a progressive impact on income distribution. This outcome, which contrasts to the regressive distributional impact found in most studies of carbon charges in industrialized countries, is driven primarily by differences between urban and rural expenditure patterns. If carbon revenues were recycled on an equal per capita basis via a ‘sky trust,’ the progressive impact would be further enhanced: low-income (mainly rural) households would receive more in sky-trust dividends than they pay in carbon charges, and high-income (mainly urban) households would pay more than they receive in dividends. Thus a Chinese sky trust would contribute to both lower fossil fuel consumption and greater income equality. 相似文献
86.
W. Brenner G. Haddad H. Detter G. Popovic A. Vujanic N. Delic 《Microsystem Technologies》1997,3(2):68-71
A miniaturized torque sensor based on cable brake principle for the measurement of torque-characteristic of minimotors and
micromotors has been developed. The first generation torque sensor enables the measurement of torque of minimotors in the
range of μNm. Design principles and the production process are described. Experimental results show fair conformity with technical
data for minimotors.
Received: 30 October 1996 / Accepted: 14 November 1996 相似文献
87.
88.
This paper deals with design and implementation of a random access dual ported memory with a sustained bandwidth of 100 MByte/s. Data blocks can be stored and retained in arbitrary order. This goal is achieved by a specialized scarch-processor based on Field Programmable Gate Arrays (FPGAs). The main advantage is the hardware-implemented search in alphabetical search trees which garantees the real-time behaviour. The concept is extendable to other applications affording data-buffering with extremly high bandwidth. 相似文献
89.
Investigation of the atomic-scale friction and energy dissipation in diamond using molecular dynamics 总被引:2,自引:0,他引:2
Judith A. Harrison Carter T. White Richard J. Colton Donald W. Brenner 《Thin solid films》1995,260(2):205-211
We have used molecular dynamics simulations to examine friction when two diamond (111) surfaces are placed in sliding contact. The essence of atomic-scale friction was shown to be the mechanical excitation (in the form of vibrational and rotational energy) of the interface lattice layers upon sliding. This excitation was propagated to the rest of the lattice, and eventually dissipated as heat. In general, this excitation increases with increasing applied load; therefore, the atomic-scale friction also increases with load. Flexible hydrocarbon species, chemically bound to the diamond surface, can lead to a significant reduction of mechanical excitation upon sliding at high loads, leading to lower friction. In addition to clarifying the effects of chemically-bound hydrocarbon groups on atomic-scale friction at diamond interfaces, these simulations might also yield insight into more complicated systems, e.g. Langmuir-Blodgett films, and aid in the design of low-friction coatings. 相似文献
90.
A continuous wavelength tuning of 2.1 nm for a waveguide grating array demultiplexer by means of a thin film heater is demonstrated. Low transmission losses of 6 dB and a crosstalk suppression of >20 dB are maintained over the entire tuning range 相似文献