全文获取类型
收费全文 | 1013篇 |
免费 | 12篇 |
专业分类
电工技术 | 46篇 |
化学工业 | 69篇 |
金属工艺 | 11篇 |
机械仪表 | 12篇 |
建筑科学 | 18篇 |
能源动力 | 34篇 |
轻工业 | 30篇 |
水利工程 | 3篇 |
无线电 | 90篇 |
一般工业技术 | 73篇 |
冶金工业 | 417篇 |
原子能技术 | 10篇 |
自动化技术 | 212篇 |
出版年
2022年 | 6篇 |
2021年 | 8篇 |
2019年 | 6篇 |
2017年 | 11篇 |
2016年 | 13篇 |
2014年 | 6篇 |
2013年 | 38篇 |
2012年 | 19篇 |
2011年 | 34篇 |
2010年 | 20篇 |
2009年 | 20篇 |
2008年 | 28篇 |
2007年 | 23篇 |
2006年 | 24篇 |
2005年 | 18篇 |
2004年 | 15篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 8篇 |
2000年 | 21篇 |
1999年 | 23篇 |
1998年 | 84篇 |
1997年 | 63篇 |
1996年 | 52篇 |
1995年 | 41篇 |
1994年 | 35篇 |
1993年 | 34篇 |
1992年 | 16篇 |
1991年 | 18篇 |
1990年 | 13篇 |
1989年 | 22篇 |
1988年 | 21篇 |
1987年 | 33篇 |
1986年 | 18篇 |
1985年 | 20篇 |
1984年 | 13篇 |
1983年 | 11篇 |
1982年 | 10篇 |
1981年 | 12篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1978年 | 13篇 |
1977年 | 12篇 |
1976年 | 23篇 |
1975年 | 5篇 |
1974年 | 5篇 |
1973年 | 9篇 |
1972年 | 5篇 |
1971年 | 5篇 |
1969年 | 5篇 |
排序方式: 共有1025条查询结果,搜索用时 0 毫秒
71.
Schafe Glenn E.; Fitts Douglas A.; Thiele Todd E.; LeDoux Joseph E.; Bernstein Ilene L. 《Canadian Metallurgical Quarterly》2000,114(1):99
The induction of c-Fos-like immunoreactivity (c-FLI) in the nucleus of the solitary tract (NTS) has been shown to be correlated with behavioral expression of a conditioned taste aversion (CTA). However, because this cellular response is also dependent on an intact amygdala, it may represent the activation of a stress-related autonomic response. The present experiments addressed this possibility by evaluating the correlation between c-FLI in the intermediate division of the NTS (iNTS) and 2 measures of conditioned fear: freezing and changes in mean arterial pressure (MAP) and heart rate (HR). Exposure to the taste conditioned stimulus (CS) resulted in a marked induction of c-FLI in the iNTS, whereas exposure to a fear CS did not. Further, exposure to a taste CS did not selectively lead to increases in MAP or HR. Results suggest that induction of c-FLI in the iNTS may reflect the activation of a cell population whose function is unique to the CTA paradigm. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
72.
SH Bernstein J Fay S Frankel N Christiansen MR Baer C Jacobs C Blosch R Hanna G Herzig 《Canadian Metallurgical Quarterly》1999,43(2):141-144
PURPOSE: The recombinant human interleukin-1 receptor (rhu IL-1R) is a soluble truncated form of the type 1 full-length membrane-bound receptor that binds IL-1 with identical affinity to that of the membrane form. As such, it may have clinical potential by sequestering IL-1, thereby preventing it from binding to its membrane-bound receptor and eliciting a biological effect. As IL-1 has been shown to regulate leukemic cell proliferation in an autocrine fashion, a phase I trial of rhu IL-1R was conducted in patients with relapsed and refractory acute myeloid leukemia (AML). METHODS: The study group comprised 11 patients who were sequentially treated on one of three dose levels, receiving a single intravenous (i.v.) bolus dose on day 1 followed by 13 days of daily subcutaneous (s.c.) injections with the option of an additional 14 days of treatment if a response of stable disease or better was achieved. Dose level 1 i.v. bolus 500 microg/m2, s.c. dose 250 microg/m2 per day (five patients); dose level 2 i.v. bolus 1000 microg/m2, s.c. dose 500 microg/m2 per day (three patients); dose level 3 i.v. bolus 2000 microg/m2, s.c. dose 1000 microg/m2 per day (three patients). Owing to limited drug availability, the study was designed to only examine these three dose levels. RESULTS: rhu IL-IR was well tolerated. There was no grade 3 or 4 non-hematological toxicity related to the study drug and the maximum tolerated dose was not reached. No IL-1R-blocking antibodies developed during the course of the study. Serum levels of IL-1beta, IL-6 and TNF were undetectable before, during and after rhu IL-IR administration. The terminal half-life after i.v. dosing was at least 7-12 h, and after s.c. dosing 2-4 days. Serum levels of rhu IL-1R up to 360- and 25-fold those of pretreatment levels were achieved after i.v. and s.c. dosing respectively. No patient had a complete, partial or minor response to treatment; four had stable disease and seven had progressive disease. CONCLUSIONS: rhu IL-1R therapy was safe but did not have any apparent antileukemic effect at the doses administered. 相似文献
73.
74.
75.
76.
Michael J Zvolensky Laura E Gibson Anka A Vujanovic Kristin Gregor Amit Bernstein Christopher Kahler C W Legues Richard A Brown Matthew T Feldner 《Nicotine & tobacco research》2008,10(8):1415-1427
The present investigation examined whether daily smokers with posttraumatic stress disorder (PTSD), as compared to daily smokers with either anxiety psychopathology or no current Axis I psychopathology, have decreased success in the early phases of a self-guided smoking quit attempt. Participants were 140 daily smokers (81 women; M (age) = 29.5; SD = 11.9; range = 18-65 years); approximately one-third of the sample met criteria for current PTSD (n = 47), one-third met criteria for other current anxiety disorders (without PTSD; n = 33), and one-third did not meet criteria for any current Axis I disorder (n = 60). Consistent with prediction, membership in the PTSD group, compared to membership in the other anxiety disorders group and the group with no current Axis I psychopathology, was associated with increased risk of lapse during the first week following quit day. Additionally, daily smokers with PTSD and other anxiety disorders were at significantly increased risk of relapse during the first week post-cessation compared to persons without Axis I psychopathology. However, the PTSD group and the other anxiety disorders group did not differ from one another in terms of relapse. Results suggest that PTSD is associated with increased risk of smoking lapse and relapse compared to smokers with no current Axis I psychiatric problems, and increased risk of early smoking lapse but not relapse, as compared to those with other anxiety disorders. Findings provide novel evidence that PTSD, and perhaps anxiety disorders more generally, may be important factors in reducing the odds of successful unaided quit attempts in the early phases of cessation. 相似文献
77.
In this paper, we formulate robust stability and performance bounds in terms of guaranteed cost inequalities. We derive new guaranteed cost bounds for plants with real structured uncertainty, and we reformulate them as linear matrix inequalities (LMIs). In particular, we obtain a shifted linear bound and a shifted inverse bound, and give LMI forms for a shifted bounded real bound, a shifted Popov bound, a shifted linear bound and a shifted inverse bound. Several examples are used to compare the shifted bounds with their unshifted counterparts and to make comparisons among these new bounds and vertex LMI bounds. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
78.
The results of a study performed on crosslinked polyethylene (XLPE) insulated cables tested in the laboratory under accelerated conditions are described. URD-type cables rated at 15 kV were aged at 60 Hz, 6 kV/mm, (150 V/mil) and load cycled daily to 90°C conductor, with water inside the pipe and outside of the samples, for periods of up to 3 years. DC testing was performed before and during the aging. An anticipated significant reduction in the AC breakdown strength is observed in control cables (not DC tested), from 44 kV/mm (1100 V/mil) for unaged cables, to 10 kV/mm (250 V/mil), for aged cables. However, there was no further reduction in the AC breakdown strength of cables subjected to DC testing as compared to those that are not tested with DC. It is concluded that AC breakdown strength is not an effective diagnostic tool for determining the effect of DC testing of URD cables aged under the conditions described 相似文献
79.
Robert Bernstein 《Software》1986,16(7):641-652
Methods are given for finding a sequence of ‘add’, ‘subtract’ and ‘shift’ instructions to multiply the contents of a register by an integer constant. Each method generalizes the previous one and requires only a few intermediate or scratch registers. A variation of the last method is used in the PL.8 compiler and uses an unnoticeable amount of the overall compile time. Some statistics roughly indicating the effectiveness of the methods are presented. 相似文献
80.