全文获取类型
收费全文 | 71133篇 |
免费 | 8935篇 |
国内免费 | 5121篇 |
专业分类
电工技术 | 6759篇 |
技术理论 | 1篇 |
综合类 | 6328篇 |
化学工业 | 9778篇 |
金属工艺 | 4220篇 |
机械仪表 | 4738篇 |
建筑科学 | 5555篇 |
矿业工程 | 2605篇 |
能源动力 | 2112篇 |
轻工业 | 6115篇 |
水利工程 | 2130篇 |
石油天然气 | 3029篇 |
武器工业 | 1045篇 |
无线电 | 8646篇 |
一般工业技术 | 7197篇 |
冶金工业 | 3410篇 |
原子能技术 | 779篇 |
自动化技术 | 10742篇 |
出版年
2024年 | 522篇 |
2023年 | 1673篇 |
2022年 | 3464篇 |
2021年 | 4619篇 |
2020年 | 3246篇 |
2019年 | 2405篇 |
2018年 | 2473篇 |
2017年 | 2729篇 |
2016年 | 2454篇 |
2015年 | 3446篇 |
2014年 | 4159篇 |
2013年 | 4785篇 |
2012年 | 5637篇 |
2011年 | 5733篇 |
2010年 | 5257篇 |
2009年 | 4846篇 |
2008年 | 4792篇 |
2007年 | 4457篇 |
2006年 | 3899篇 |
2005年 | 3306篇 |
2004年 | 2171篇 |
2003年 | 1577篇 |
2002年 | 1395篇 |
2001年 | 1312篇 |
2000年 | 1055篇 |
1999年 | 742篇 |
1998年 | 681篇 |
1997年 | 509篇 |
1996年 | 430篇 |
1995年 | 299篇 |
1994年 | 253篇 |
1993年 | 176篇 |
1992年 | 123篇 |
1991年 | 102篇 |
1990年 | 75篇 |
1989年 | 66篇 |
1988年 | 52篇 |
1987年 | 40篇 |
1986年 | 41篇 |
1985年 | 15篇 |
1984年 | 12篇 |
1983年 | 6篇 |
1982年 | 16篇 |
1981年 | 11篇 |
1980年 | 23篇 |
1979年 | 13篇 |
1977年 | 19篇 |
1976年 | 38篇 |
1959年 | 17篇 |
1951年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
研究了用真空蒸发法在玻璃衬底上制备稀土掺杂纳米ZnO薄膜结构、导电性及光透射性能。结果显示 ,在 5 0 0℃氧化、热处理稀土元素Nd掺杂后能够明显改善纳米ZnO薄膜的结构特性 ,薄膜的晶粒尺寸随掺杂含量的增加而减小。掺Nd使ZnO薄膜的电性能有所改善但使纳米ZnO薄膜的光透射性有所降低。 相似文献
93.
Multimode parameter extraction for multiconductor transmissionlines via single-pass FDTD and signal-processing techniques 总被引:1,自引:0,他引:1
Yuanxun Wang Hao Ling 《Microwave Theory and Techniques》1998,46(1):89-96
We present two approaches to extract the broadband multimode parameters of guided wave structures from a single-pass finite-difference time-domain (FDTD) simulation. They include a two-dimensional (2-D) Fourier transform (FT) algorithm and a super-resolution estimation of signal parameters via rotational invariance technique (ESPRIT) algorithm. Comparison is made to show the superiority of the super-resolution approach. As a typical application, a three-line coupled microstrip structure is studied. After a single-pass FDTD simulation, broadband multimode parameters such as propagation constants, modal-field templates, and modal impedances are extracted and verified against published data obtained by the spectral-domain method. The main feature of this parameter-extraction methodology is that it decouples the computational electromagnetics engine (in this case, the FDTD simulator) from the post-processing parameter-extraction algorithm, thus providing more flexibility and connectivity among the various simulation tools 相似文献
94.
提出了溅射-气体-聚集共沉积制备金属/金属(介质)复合团簇镶嵌薄膜的新方法,并利用该方法成功地在方华膜衬底上制备了系列Fe/Ag及CaF2复合团簇镶嵌薄膜样品。透射电镜分析结果表明,样品中Fe(Cu)团簇都较好地镶嵌于Ag(CaF2)基质中,其结构为两种材料的多晶共存形态。进一步分析发现,与块材相比,Fe/Ag样品中Fe团簇晶格常数呈现出不同程度的收缩,而Cu/CaF2样品中Cu团簇晶格常数则呈现出不同程度的膨胀。运用附加压力的模型对该现象进行了解释。 相似文献
95.
EG Mdurvwa JI Alak GE Pimentel-Smith HS Gakou S Kolavala H Abdelrahman PG Reddy 《Canadian Metallurgical Quarterly》1997,43(7):1039-1044
The LP-BM5 murine leukemia virus causes acquired immunodeficiency syndrome in C57BL/6J mice (MAIDS), similar to that of AIDS in humans. The objective of this study was to determine the effect of LP-BM5 viral infection on cellular activation and membrane integrity of splenocytes. Oxidative burst in splenocytes in response to exposure to PMA (20 microg/ml) was significantly higher (p<.02) in infected than in control mice at two weeks post-infection using luminol-enhanced chemiluminescence. By 13 weeks post-infection superoxide anion production in infected mice was significantly lower when compared to controls coinciding with decreased proliferative response to mitogens. The extent of cell membrane damage as indicated by lactic dehydrogenase (LDH) activity in serum was significantly higher in infected than in control mice (p<.001). The results from this study suggests that LP-BM5 virus causes an initial stimulation of cellular activity followed by a decreased cell activation characterized by decreased proliferation of splenocytes and decreased oxygen radical production. Decreased cell membrane integrity indicated by increased LDH activity may partly be responsible for these changes. 相似文献
96.
JI Kourie 《Canadian Metallurgical Quarterly》1997,157(1):39-51
In addition to its role in olfaction and as a primary epileptogenic site, the anterior piriform cortex has been suggested to play a role in neuroperception of deficiencies or imbalances in physiologically essential amino acids. In recent studies, amino acid deficient diets were shown to induce expression of c-fos in the anterior piriform cortex within the rapid time frame associated with the normal anorectic response to such diets. It became important to examine the neurocytochemical architecture of this region for clues as to how and more precisely where dietary amino acid deficiency or imbalance might be monitored. The relationships of neuropeptide Y-, somatostatin-, and cholecystokinin-containing neurons were of particular interest because ongoing studies indicate that those peptides administered to the anterior piriform cortex alter intake of diets deficient in essential amino acids. The neuropeptides were endogenous to intrinsic neurons only; none resembled pyramidal projection neurons. Peptidergic neurons and fibers were concentrated most heavily in layer III of the paleocortex. The cytoarchitecture suggests that neuropeptide Y-, somatostatin-, and cholecystokin-containing neurons of the anterior piriform cortex may relate synaptically or multisynaptically to local circuit neurons during electrical activity, modulation of olfactory information, and neuroperception of essential amino acids. 相似文献
97.
Sperm-induced Ca2+ signals mediate the events of oocyte activation at fertilization. In this study, the development of mechanisms involved in the generation of Ca2+ signals in human oocytes was investigated. The thiol reagent, thimerosal, which induces oscillations of intracellular Ca2+ ([Ca2+]i) similar to those seen during fertilization, was used to mobilize Ca2+ in in-vivo matured, immature and in-vitro matured human oocytes. There was an increase in the sensitivity to thimerosal during maturation of human oocytes, with oocytes from small antral follicles being relatively insensitive, compared with those from luteinized follicles, which displayed a large spike followed by sustained oscillations in [Ca2+]i. These oscillations were inhibited by caffeine which suggests that they were mediated by the inositol trisphosphate receptor Ca2+ release system. When immature oocytes were cultured in vitro they acquired the capacity to undergo a single large spike in [Ca2+]i, however, subsequent sustained oscillations were not observed, indicating that these oocytes failed to develop fully competent Ca2+ signalling mechanisms during culture in vitro. This finding may be a key factor in the poor developmental competence of in-vitro matured human oocytes. 相似文献
98.
YC Lo L Brett CJ Kenyon SD Morley JI Mason BC Williams 《Canadian Metallurgical Quarterly》1998,24(3-4):559-563
We have employed polyclonal antibodies to a peptide sequence of bovine steroidogenic acute regulatory (StAR) protein and human placental 3beta-hydroxysteroid dehydrogenase (3beta-HSD) to determine the localisation and distribution of these proteins in rat and bovine adrenal glands. Immunohistochemical staining demonstrated the presence of StAR protein in the zona glomerulosa (ZG), zona fasciculata (ZF), zona reticularis (ZR) and in the medulla of both species. For 3beta-HSD, immunostaining was observed in the ZG, ZF and ZR of the rat adrenal and was absent in the medulla. Immunoblotting experiments showed intense bands for StAR protein (30 kDa, 37 kDa) in the mitochondria of bovine ZG, ZF and medulla and a less intense band (30 kDa) in the microsomes. In rat ZG and ZF/R mitochondria only the 30 kDa protein was present. For 3beta-HSD, an intense band (42 kDa) was found in microsomes and mitochondria of rat and bovine ZG and ZFR. A very faint signal for 3beta-HSD was seen in adrenal medulla. In conclusion, StAR (or a closely related) protein is present throughout the adrenal gland in rat and bovine species in contrast to 3beta-HSD which is confined to the steroidogenic zones. The possible function of StAR protein in the adrenal medulla merits investigation. 相似文献
99.
Forty-three rescuers responding to a bus crash that killed 12 children and 4 adults and injured many more answered questionnaires at 1 and 13 months following the crash. This study compared the responses of the voluntary and professional helpers, using the Impact of Event Scale (IES) and the General Health Questionnaire (GHQ). For all helpers taken together, the decline in IES-intrusion and IES-total scores was significant from 1 to 13 months. The voluntary helpers reported significantly more intrusion and avoidance on the IES at 1 month than professional helpers, and for avoidance the voluntary helpers still evidenced a significantly higher score than professional helpers at 13 months. The GHQ scores at 13 months reflected that the long-term negative impact of the event was low. 相似文献
100.