全文获取类型
收费全文 | 19143篇 |
免费 | 677篇 |
国内免费 | 350篇 |
专业分类
电工技术 | 317篇 |
综合类 | 1057篇 |
化学工业 | 4066篇 |
金属工艺 | 656篇 |
机械仪表 | 1011篇 |
建筑科学 | 470篇 |
矿业工程 | 133篇 |
能源动力 | 364篇 |
轻工业 | 931篇 |
水利工程 | 109篇 |
石油天然气 | 526篇 |
武器工业 | 57篇 |
无线电 | 1080篇 |
一般工业技术 | 3590篇 |
冶金工业 | 746篇 |
原子能技术 | 52篇 |
自动化技术 | 5005篇 |
出版年
2023年 | 80篇 |
2022年 | 56篇 |
2021年 | 85篇 |
2020年 | 50篇 |
2019年 | 82篇 |
2018年 | 1025篇 |
2017年 | 1289篇 |
2016年 | 1324篇 |
2015年 | 593篇 |
2014年 | 271篇 |
2013年 | 262篇 |
2012年 | 746篇 |
2011年 | 1163篇 |
2010年 | 185篇 |
2009年 | 212篇 |
2008年 | 243篇 |
2007年 | 260篇 |
2006年 | 239篇 |
2005年 | 4299篇 |
2004年 | 3242篇 |
2003年 | 2386篇 |
2002年 | 497篇 |
2001年 | 214篇 |
2000年 | 90篇 |
1999年 | 136篇 |
1998年 | 259篇 |
1997年 | 131篇 |
1996年 | 105篇 |
1995年 | 67篇 |
1994年 | 68篇 |
1993年 | 103篇 |
1992年 | 87篇 |
1991年 | 59篇 |
1990年 | 22篇 |
1989年 | 24篇 |
1988年 | 14篇 |
1987年 | 14篇 |
1986年 | 14篇 |
1985年 | 12篇 |
1984年 | 17篇 |
1983年 | 12篇 |
1982年 | 9篇 |
1981年 | 11篇 |
1980年 | 15篇 |
1979年 | 8篇 |
1977年 | 10篇 |
1976年 | 10篇 |
1974年 | 9篇 |
1973年 | 7篇 |
1971年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Krzysztof M. Tokarz Wojciech Wesoowski Barbara Tokarz Wojciech Makowski Anna Wysocka Roman J. Jdrzejczyk Karolina Chrabaszcz Kamilla Malek Anna Kostecka-Gugaa 《International journal of molecular sciences》2021,22(2)
Grass pea (Lathyrus sativus) is a leguminous plant of outstanding tolerance to abiotic stress. The aim of the presented study was to describe the mechanism of grass pea (Lathyrus sativus L.) photosynthetic apparatus acclimatisation strategies to salinity stress. The seedlings were cultivated in a hydroponic system in media containing various concentrations of NaCl (0, 50, and 100 mM), imitating none, moderate, and severe salinity, respectively, for three weeks. In order to characterise the function and structure of the photosynthetic apparatus, Chl a fluorescence, gas exchange measurements, proteome analysis, and Fourier-transform infrared spectroscopy (FT-IR) analysis were done inter alia. Significant differences in the response of the leaf and stem photosynthetic apparatus to severe salt stress were observed. Leaves became the place of harmful ion (Na+) accumulation, and the efficiency of their carboxylation decreased sharply. In turn, in stems, the reconstruction of the photosynthetic apparatus (antenna and photosystem complexes) activated alternative electron transport pathways, leading to effective ATP synthesis, which is required for the efficient translocation of Na+ to leaves. These changes enabled efficient stem carboxylation and made them the main source of assimilates. The observed changes indicate the high plasticity of grass pea photosynthetic apparatus, providing an effective mechanism of tolerance to salinity stress. 相似文献
2.
Klimis?S.?NtalianisEmail author Anastasios?D.?Doulamis Nikolaos?D.?Doulamis Nikos?E.?Mastorakis Athanasios?S.?Drigas 《Journal of Signal Processing Systems》2015,80(2):153-161
In this paper, we present a novel memory access reduction scheme (MARS) for two-dimension fast cosine transform (2-D FCT). It targets programmable DSPs with high memory-access latency. It reduces the number of memory accesses by: 1) reducing the number of weighting factors and 2) combining butterflies in vector-radix 2-D FCT pruning diagram from two stages to one stage with an efficient structure. Hardware platform based on general purpose processor is used to verify the effectiveness of the proposed method for vector-radix 2-D FCT pruning implementation. Experimental results validate the benefits of the proposed method with reduced memory access, less clock cycle and fewer memory space compared with the conventional implementation. 相似文献
3.
4.
5.
The fission yeast Schizosaccharomyces pombe is an important model organism for the study of fundamental questions in eukaryotic cell and molecular biology. A plethora of cellular processes are membrane associated and/or dependent on the proper functioning of cellular membranes. Phospholipids are not only the basic building blocks of cellular membranes; they also serve as precursors to numerous signaling molecules. In this review, we describe the biosynthetic pathways leading to major S. pombe phospholipids, how these pathways are regulated, and what is known about degradation and turnover of fission yeast phospholipids. This review also addresses the synthesis, regulation and the role of water-soluble phospholipid precursors. The last chapter of the review is devoted to the use of S. pombe for the biotechnological production of value-added lipid molecules. 相似文献
6.
Storage lipids, triacylglycerols (TAG), and steryl esters (SE), are predominant constituents of lipid droplets (LD) in fungi. In several yeast species, metabolism of TAG and SE is linked to various cellular processes, including cell division, sporulation, apoptosis, response to stress, and lipotoxicity. In addition, TAG are an important source for the generation of value-added lipids for industrial and biomedical applications. The fission yeast Schizosaccharomyces pombe is a widely used unicellular eukaryotic model organism. It is a powerful tractable system used to study various aspects of eukaryotic cellular and molecular biology. However, the knowledge of S. pombe neutral lipids metabolism is quite limited. In this review, we summarize and discuss the current knowledge of the homeostasis of storage lipids and of the role of LD in the fission yeast S. pombe with the aim to stimulate research of lipid metabolism and its connection with other essential cellular processes. We also discuss the advantages and disadvantages of fission yeast in lipid biotechnology and recent achievements in the use of S. pombe in the biotechnological production of valuable lipid compounds. 相似文献
7.
Barch Deanna M.; Mitropoulou Vivian; Harvey Philip D.; New Antonia S.; Silverman Jeremy M.; Siever Larry J. 《Canadian Metallurgical Quarterly》2004,113(4):556
Research suggests that schizotypal personality disorder (SPD) is a part of the spectrum of schizophrenia-related illnesses. This article hypothesizes that a deficit in the representation and maintenance of context is a core cognitive disturbance in schizophrenia and that SPD individuals should demonstrate context-processing deficits. To test this hypothesis, the authors administered 3 versions of their AX-CPT task, designed to assess context processing, to 35 healthy controls and 26 individuals with DSM-IV SPD. They also administered working memory and selective attention tasks. SPD individuals displayed context representation deficits similar to those found in schizophrenia but did not show the same additional deficits in context maintenance. Context processing was strongly associated with working memory and selective attention performance in the SPD individuals. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
8.
碱法造纸黑液驱油研究 总被引:2,自引:0,他引:2
在玻璃细珠充填柱人造岩心模型上进行了碱法造纸黑液驱替稠油的实验研究,考察了稠油酸值、盐、温度、岩心渗透率、注入量和注入方式的影响。在实验条件下碱法造纸黑液驱稠油的采收率较水驱提高25% 相似文献
9.
浙江省发展新型墙体材料办公室 《墙材革新与建筑节能》2002,(10):12-14
在国家宏观政策的引导和浙江省委、省政府的领导下,经过社会各界10多年的共同努力,全省墙材革新工作取得显著成效.在政策制定、机构建设、产品开发、示范应用及开拓进取方面都取得突破性进展,取得了很好的社会效益和经济效益,为浙江经济社会可持续发展作出了应有的贡献. 相似文献
10.
本文以维斯康尼的四个建筑作品为例分析了其建筑设计的艺术特性。凭借对“限制”内涵的深入思考和领会,维斯康尼以其独特的手法和操作方式营建其作品的永恒性。 相似文献