全文获取类型
收费全文 | 243479篇 |
免费 | 2947篇 |
国内免费 | 1244篇 |
专业分类
电工技术 | 4829篇 |
综合类 | 264篇 |
化学工业 | 35413篇 |
金属工艺 | 10861篇 |
机械仪表 | 7066篇 |
建筑科学 | 6238篇 |
矿业工程 | 481篇 |
能源动力 | 6273篇 |
轻工业 | 24146篇 |
水利工程 | 1836篇 |
石油天然气 | 1335篇 |
武器工业 | 3篇 |
无线电 | 31035篇 |
一般工业技术 | 44883篇 |
冶金工业 | 50106篇 |
原子能技术 | 3860篇 |
自动化技术 | 19041篇 |
出版年
2021年 | 1566篇 |
2019年 | 1423篇 |
2018年 | 2321篇 |
2017年 | 2224篇 |
2016年 | 2444篇 |
2015年 | 1907篇 |
2014年 | 3159篇 |
2013年 | 10793篇 |
2012年 | 5450篇 |
2011年 | 7787篇 |
2010年 | 6284篇 |
2009年 | 6962篇 |
2008年 | 7560篇 |
2007年 | 7658篇 |
2006年 | 7031篇 |
2005年 | 6519篇 |
2004年 | 6244篇 |
2003年 | 6261篇 |
2002年 | 6239篇 |
2001年 | 6371篇 |
2000年 | 5801篇 |
1999年 | 6417篇 |
1998年 | 16558篇 |
1997年 | 11597篇 |
1996年 | 8948篇 |
1995年 | 6689篇 |
1994年 | 5907篇 |
1993年 | 5727篇 |
1992年 | 4051篇 |
1991年 | 3994篇 |
1990年 | 3582篇 |
1989年 | 3504篇 |
1988年 | 3440篇 |
1987年 | 2908篇 |
1986年 | 2842篇 |
1985年 | 3413篇 |
1984年 | 3050篇 |
1983年 | 2743篇 |
1982年 | 2547篇 |
1981年 | 2568篇 |
1980年 | 2430篇 |
1979年 | 2271篇 |
1978年 | 2235篇 |
1977年 | 2808篇 |
1976年 | 4171篇 |
1975年 | 1899篇 |
1974年 | 1795篇 |
1973年 | 1783篇 |
1972年 | 1460篇 |
1971年 | 1317篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Two dosages of Smokeless Tobacco (ST) extract were given to gravid Sprague-Dawley rats by oral gavage on gestational days (GD) 6-20. The low dosage contained ST extract equivalent to 1.33 mg/kg nicotine (STD-1), and the high dosage contained ST extract equivalent to 4.0 mg/kg nicotine (STD-2). Dams were dosed three times daily at 8 a.m., 11 a.m., and 2 p.m., thus providing total daily nicotine equivalent dosages of 4 mg/kg/day and 12 mg/kg/day. Controls received equivalent amounts of distilled water by gavage. Dams were allowed to deliver and all experimental pups were fostered to control mothers. On postnatal day 1 (PND 1) litters were culled to 4 +/- 1 females and 4 +/- 1 males. Weights, physical landmark development, and behavioral performance of pups were monitored during pre- and post-weaning periods. Behavioral tests included: surface righting, negative geotaxis, swimming development, open-field activity, active avoidance in shuttle box, and Cincinnati swimming maze. Our results show that the STD-2 dose resulted in reduced maternal weight gain. Offspring weights were reduced in a dose-related manner, with the most consistent weight deficits seen in the STD-2 group until PND29. Consistent STD-1 weight deficits were seen up to PND 8. The incidence of deaths was increased in the STD-2 dosage group. No significant treatment-related differences were observed in development of physical landmarks. Male STD-2 pups righted faster than controls, and significant differences were noted in swimming development with the STD-1 group of pups performing less effectively than controls. Activity levels, assessed during both pre- and post-weaning periods were not affected. No treatment-related differences were seen in the active avoidance shuttle box or Cincinnati swimming maze tests, which assessed learning. Female brain weights were reduced in the STD-1 treatment group. 相似文献
993.
Riedel S.A. Harris G.F. Jizzine H.A. 《IEEE engineering in medicine and biology magazine》1992,11(4):42-47
Results of tests undertaken to identify which measures of seated posture control are most effective in two areas, distinguishing differences in the x and y direction control strategies for a given task and distinguishing differences in overall control strategies for pairs of different tasks, are presented. The test platform, calibration tests, test protocol, and data analysis method are described. The results of statistical analyses performed on the data are summarized 相似文献
994.
A simple electrical network is used to represent the five differential equations describing basic phenomena in one-dimensional semiconductor devices. Both standard and integrated approaches for solving transport equations are developed. Also, an electrical network equivalent for the nonlinear Poisson equation was derived. It allows students to better understand the physical phenomena and the process of computer simulation of such semiconductor devices 相似文献
995.
996.
997.
H Ochiai A Ikesue M Kurokawa K Nakajima H Nakagawa 《Canadian Metallurgical Quarterly》1993,67(11):6811-6814
We investigated the interleukin-8 (IL-8)-producing activity of influenza A NWS virus in cultured rat kidney NRK-52E cells and a rat influenza model. The production of rat IL-8 increased significantly in the virus-infected cells but not in UV-inactivated virus- or split-product-treated cells. The increase in IL-8 production could be detected in the bronchoalveolar lavage of infected rats. These data suggest that infectious virus has the potential to accelerate the production of IL-8 in cultured cells and in vivo in airway-lining cells. 相似文献
998.
999.
S Maruyama T Kurosaki K Sada Y Yamanashi T Yamamoto H Yamamura 《Canadian Metallurgical Quarterly》1996,271(12):6631-6635
Human leukemic cell line K562 is induced to differentiate into the megakaryocytic lineage by stimulation with 12-O-tetradecanoylphorbol-13-acetate (TPA). We demonstrate here that TPA stimulation increases tyrosine phosphorylation of an 80-kDa protein at an early stage of megakaryocytic differentiation and that this 80-kDa protein is identical with cortactin. Since tyrosine kinase Syk was activated by TPA stimulation, we examined the possibility that cortactin is a potential substrate of Syk in K562 cells. TPA-induced tyrosine phosphorylation of cortactin was decreased profoundly by overexpression of dominant-negative Syk. Furthermore, cortactin was associated with Syk even before TPA stimulation. Since cortactin was previously referred as an 80/85-kilodalton pp60src substrate, we examined the association between Src and cortactin, whereas its association could not be detected. These data suggest that Syk phosphorylates cortactin in K562 cells upon TPA treatment. 相似文献
1000.
The design, fabrication, and characterization of thermally excited silicon oxide beam and bridge resonators by a modern industrial CMOS process combined with one additional maskless etching step is reported. The resonant frequencies, vibration amplitudes, and mode shapes of the devices are measured using a laser heterodyne interferometer. The acoustic transmitting and receiving sensitivities of the resonant structures in air are investigated in order to test their possible application as ultrasound transducers for proximity sensing. The experimental results are compared with finite element simulations using ANSYS 相似文献