全文获取类型
收费全文 | 37058篇 |
免费 | 2110篇 |
国内免费 | 59篇 |
专业分类
电工技术 | 243篇 |
综合类 | 124篇 |
化学工业 | 8795篇 |
金属工艺 | 698篇 |
机械仪表 | 806篇 |
建筑科学 | 1127篇 |
矿业工程 | 89篇 |
能源动力 | 968篇 |
轻工业 | 7534篇 |
水利工程 | 366篇 |
石油天然气 | 235篇 |
武器工业 | 2篇 |
无线电 | 1544篇 |
一般工业技术 | 5583篇 |
冶金工业 | 6029篇 |
原子能技术 | 158篇 |
自动化技术 | 4926篇 |
出版年
2024年 | 78篇 |
2023年 | 370篇 |
2022年 | 866篇 |
2021年 | 1327篇 |
2020年 | 928篇 |
2019年 | 1000篇 |
2018年 | 1479篇 |
2017年 | 1475篇 |
2016年 | 1546篇 |
2015年 | 1145篇 |
2014年 | 1511篇 |
2013年 | 3058篇 |
2012年 | 2444篇 |
2011年 | 2390篇 |
2010年 | 1907篇 |
2009年 | 1724篇 |
2008年 | 1596篇 |
2007年 | 1395篇 |
2006年 | 1044篇 |
2005年 | 855篇 |
2004年 | 768篇 |
2003年 | 773篇 |
2002年 | 612篇 |
2001年 | 495篇 |
2000年 | 404篇 |
1999年 | 456篇 |
1998年 | 2168篇 |
1997年 | 1395篇 |
1996年 | 892篇 |
1995年 | 502篇 |
1994年 | 401篇 |
1993年 | 387篇 |
1992年 | 144篇 |
1991年 | 108篇 |
1990年 | 86篇 |
1989年 | 94篇 |
1988年 | 112篇 |
1987年 | 105篇 |
1986年 | 78篇 |
1985年 | 94篇 |
1984年 | 83篇 |
1983年 | 54篇 |
1982年 | 53篇 |
1981年 | 79篇 |
1980年 | 81篇 |
1978年 | 41篇 |
1977年 | 122篇 |
1976年 | 233篇 |
1975年 | 39篇 |
1973年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
P Sánchez García 《Canadian Metallurgical Quarterly》1997,114(1):157-63; discussion 164-7
22.
23.
Summary The thermal properties of an epoxy resin (diglycidyl ether Bisphenol A, DGEBA) cured with a primary amine (ethylenediamine, ETDA) and filled with 10, 20 and 30 wt. % of ultra fine copper particles were analyzed. The thermal results were evaluated by means of the Romero-Garcia method, which allowed to obtain the resin degradation kinetic parameters, as well as the possible decomposition mechanism. From the obtained results is possible to infer that higger copper content strongly affects the degradation process of the epoxy resin, which causes a drop off on the composites thermal stability. This behavior could be attributed to water presence, being this effect less pronounced for the resin with 10 wt. % copper and unfilled resin. Regarding to decomposition mechanism, three way transport showed the best correlation for all samples. 相似文献
24.
Lime mortars are often used for repairs to historic buildings. This paper investigates two forms of lime binder: fat and feebly-hydraulic,
in order to predict their long-term behaviours and hence ascertain which of the two possesses greater durability, so that
they may be used more efficiently in restoration. Mortars were tested for properties governing moisture movement and also
subject to durability cycles. The resistance to damage under freezing conditions was evaluated with the saturation coefficient.
Thermal cycles had no effect on the mortars and gave no indication of the relative durabilities of the binders. Salt crystallization
cycles, though effective in distinguishing the more durable of the two, were too aggressive to gauge a clear profile of salt
weathering and succeeded in rapidly decomposing the samples. Tests on the properties governing moisture movement produced
good indications of the degree to which the mortars permit flow through their fabrics. According to the results obtained,
fat lime mortars are more durable than those made with feebly-hydraulic lime. The results also suggest that the feebly-hydraulic
lime mortars are at a higher risk of decomposition by granular disintegration whereas fat lime mortars are better suited to
damp, slightly exposed conditions. These results disagree with the general opinion that hydraulic limes are more durable than
fat limes due to the additional strength and water insolubility arising from their hydraulicity. 相似文献
25.
In this study, nitrogen removal was investigated in pilot-scale subsurface flow (SSF) and in free water surface flow (FWS) constructed wetlands installed in the campus of TUBITAK-Marmara Research Center, Gebze, near Istanbul, Turkey. The main purposes of this study are to apply constructed wetlands for the protection of water reservoirs and to reuse wastewater. Experiments were carried out at continuous flow reactors. The effects of the type of plants on the removal were investigated by using emergent (Canna, Cyperus, Typhia spp., Phragmites spp., Juncus, Poaceae, Paspalum and Iris.), submerged (Elodea, Egeria) and floating (Pistia, Salvina and Lemna) marsh plants at different conditions. During the study period HLRs were 30, 50, 70, 80 and 120 L m(2)d(-1) respectively. The average annual NH4-N, NO(3)-N, organic N and TN treatment efficiencies in SSF and FWS wetlands are 81% and 68%, 37% and 49%, 75% and 68%, 47% and 53%, respectively. Nitrification, denitrification and ammonification rate constant (k20) values in SSF and FNS systems have been found as 0.898 d(-1) and 0.541 d(-1), 0.488 d(-1) and 0.502 d(-1), 0.986 d(-1) and 0.908 respectively. Two types of the models (first-order plug flow and multiple regression) were tried to estimate the system performances. 相似文献
26.
María Esther Diupotex-Chong Néstor J Cazzaniga Alejandra Hernández-Santoyo José Miguel Betancourt-Rule 《Biocell》2004,28(3):279-285
Mitotic chromosomes of the freshwater snail Pomacea patula catemacensis (Baker 1922) were analyzed on gill tissue of specimens from the type locality (Lake Catemaco, Mexico). The diploid number of chromosomes is 2n = 26, including nine metacentric and four submetacentric pairs; therefore, the fundamental number is FN = 52, No sex chromosomes could be identified. The same chromosome number and morphology were already reported for P. flagellata, i.e., the other species of the genus living in Mexico. The basic haploid number for family Ampullariidae was reported to be n = 14 in the literature; so, its reduction to n = 13 is probably an apomorphy of the Mexican Pomacea snails. Lanistes bolteni, from Egypt, also shows n = 13, but its karyotype is much more asymmetrical, and seems to have evolved independently from P. flagellata and P. patula catemacensis. The nominotypical subspecies, P. patula patula (Reeve 1856), is a poorly known taxon, whose original locality is unknown. A taxonomical account is presented here, and a Mexican origin postulated as the most parsimonious hypothesis. 相似文献
27.
Imperfection in information can be considered a crosscutting concern that manifests itself in diverse kinds of imprecision, uncertainty, or inconsistency in the data models of a software system. The extension of existing programming and querying interfaces for the different aspects of information imperfection requires a proper modularization of the different concerns of numerical imprecision handling, so that the extensions do not interfere with existing programming practices and do not obscure the original design. Aspect‐oriented design (AOD) enables such a form of nonintrusive extensions to be added to existing software libraries, clearly separating fuzziness or other imperfections in data as a differentiated concern that can be considered from the early phases of development. In this article, a general framework for aspect‐based extension of data models and fuzzy databases is described, and some design and implementation issues of such AOD‐based extensions on OJB database libraries are described as a case study. © 2006 Wiley Periodicals, Inc. Int J Int Syst 21: 1199–1216, 2006. 相似文献
28.
Jiří Polívka 《Journal of Infrared, Millimeter and Terahertz Waves》1996,17(10):1779-1788
In his earlier paper on Active Microwave Radiometry, the author indicated that microwave noise can be used to map field density distribution inside radiators and in antenna systems, without the need for anechoic chambers. The presented paper gives details and results of such experiment. The method is described, details of equipment are given and results are presented with a concluding commentary. 相似文献
29.
30.
MJ Castro P Morales V Fernández-Soria B Suarez MJ Recio M Alvarez M Martín-Villa A Arnaiz-Villena 《Canadian Metallurgical Quarterly》1996,43(6):327-336
The aim of this study was to determine whether bisaramil-an antiarrhythmic compound under clinical investigation-influences the reperfusion-induced arrhythmias and biochemical parameters characterizing occlusion-reperfusion-induced free-radical reactions. The left descending coronary artery (LAD) was occluded for 60 min in anaesthetized dogs followed by one hour of reperfusion. Blood samples were taken at different times of the occlusion and reperfusion for the determination of plasma concentration of malondialdehyde (MDA), reduced (GSH) and oxidized glutathione (GSSG); furthermore of the activity of catalase and superoxide dismutase (SOD). Free-radical generating capacity of polymorph neutrophil granulocytes (PMN) was also measured. At the end of the experiments heart tissue samples were excised from the injured areas and from the intact part of the left ventricular muscle. In tissues samples the concentrations of MDA and GSH and the activity of SOD were determined. Bisaramil was given as an i.v. bolus injection at a dose of 2 mg kg-1 several minutes prior to the end of LAD-occlusion; then the administration was repeated in the 30th minute of reperfusion. In the control group (10 dogs) ventricular fibrillation (VF) occurred in seven cases which resulted in death in three. In the bisaramil-treated group, however. VF was seen in three cases and no death was recorded. Bisaramil inhibited the elevation of the plasma concentration of MDA and GSSG during the reperfusion and abolished the decrease in the plasma concentration of GSH during the occlusion and reperfusion. The activity of SOD and catalase in plasma was much better preserved in the bisaramil-treated group then in the controls. Bisaramil significantly inhibited the increase of the superoxide-radical generating capacity of PMNs during the reperfusion. The data obtained from myocardial tissue samples supported the cardioprotective effect of bisaramil. The biochemical investigation of ischemic-reperfused myocardium showed that bisaramil promoted preservation of SOD-activity and of tissue glutathione. Results of this study clearly showed that bisaramil has a significant effect on ischemiareperfusion injury. Besides its inhibitory effects on ischaemia-reperfusion induced arrhythmias it has a special benefit in influencing free-radical mediated damage leading to better preservation of membranes and to limitations of irreversible cell injuries. 相似文献