全文获取类型
收费全文 | 6995篇 |
免费 | 60篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 25篇 |
化学工业 | 402篇 |
金属工艺 | 63篇 |
机械仪表 | 41篇 |
建筑科学 | 109篇 |
矿业工程 | 35篇 |
能源动力 | 52篇 |
轻工业 | 229篇 |
水利工程 | 23篇 |
石油天然气 | 13篇 |
无线电 | 251篇 |
一般工业技术 | 308篇 |
冶金工业 | 5146篇 |
原子能技术 | 31篇 |
自动化技术 | 331篇 |
出版年
2021年 | 33篇 |
2020年 | 25篇 |
2019年 | 25篇 |
2018年 | 30篇 |
2017年 | 43篇 |
2016年 | 31篇 |
2015年 | 26篇 |
2014年 | 42篇 |
2013年 | 145篇 |
2012年 | 57篇 |
2011年 | 93篇 |
2010年 | 64篇 |
2009年 | 72篇 |
2008年 | 96篇 |
2007年 | 82篇 |
2006年 | 72篇 |
2005年 | 81篇 |
2004年 | 60篇 |
2003年 | 81篇 |
2002年 | 59篇 |
2001年 | 58篇 |
2000年 | 55篇 |
1999年 | 218篇 |
1998年 | 1599篇 |
1997年 | 911篇 |
1996年 | 617篇 |
1995年 | 332篇 |
1994年 | 303篇 |
1993年 | 331篇 |
1992年 | 79篇 |
1991年 | 72篇 |
1990年 | 83篇 |
1989年 | 94篇 |
1988年 | 85篇 |
1987年 | 52篇 |
1986年 | 63篇 |
1985年 | 54篇 |
1984年 | 30篇 |
1983年 | 34篇 |
1982年 | 43篇 |
1981年 | 39篇 |
1980年 | 68篇 |
1979年 | 35篇 |
1978年 | 37篇 |
1977年 | 117篇 |
1976年 | 249篇 |
1975年 | 27篇 |
1974年 | 20篇 |
1973年 | 19篇 |
1971年 | 15篇 |
排序方式: 共有7059条查询结果,搜索用时 0 毫秒
61.
62.
Mitchell Gregory; Tetlock Philip E.; Mellers Barbara A.; Ordó?ez Lisa D. 《Canadian Metallurgical Quarterly》1993,65(4):629
Political economists agree that a trade-off exists between equality and efficiency. Using a hypothetical society paradigm, the mean income (representing efficiency) and income variability (representing equality) of distributions of wealth and the correlation between wealth and effort within a society were manipulated. Ss made all pairwise comparisons of distributions within societies of differing meritocracy. A "maximin" principle best described trade-off resolution strategies when effort and outcome were weakly linked: People maximized the minimum standard of living within a society. A compromise principle best described preferences when income was tightly linked to effort: People rejected distributions in which some citizens fell below the "poverty line" but maximized efficiency above this constraint. Ideological polarization was pronounced under moderate meritocracy; here liberals could focus on the role of chance and conservatives on the role of effort and ability. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
63.
LH Olde Damink PJ Dijkstra MJ van Luyn PB van Wachem P Nieuwenhuis J Feijen 《Canadian Metallurgical Quarterly》1996,17(7):679-684
Bacterial collagenase was used to study the susceptibility of dermal sheep collagen (DSC) cross-linked with a mixture of the water-soluble carbodiimide 1-ethyl-3-(3-dimethyl aminopropyl)-carbodiimide hydrochloride and N-hydroxysuccinimide (E/N-DSC) towards enzymatic degradation. Contrary to non-cross-linked DSC (N-DSC), which had a rate of weight-loss of 18.1% per hour upon degradation, no weight loss was observed for E/N-DSC during a 24 h degradation period. The tensile strength of the E/N-DSC samples decreased during this time period, resulting in partially degraded samples having 80% of the initial tensile strength remaining. The susceptibility of E/N-DSC samples towards enzymatic degradation could be controlled by varying the degree of cross-linking of the samples. Ethylene oxide sterilization of E/N-DSC samples made the material more resistant against degradation compared with non-sterilized E/N-DSC samples. This may be explained by a decrease of the adsorption of bacterial collagenase onto the collagen owing to reaction of ethylene oxide with remaining free amine groups in the collagen matrix. 相似文献
64.
PJ Weston RB Panerai A McCullough PG McNally MA James JF Potter H Thurston JD Swales 《Canadian Metallurgical Quarterly》1996,39(11):1385-1391
Autonomic dysfunction in insulin-dependent diabetic (IDDM) patients has been associated with abnormalities of left ventricular function and an increased risk of sudden death. A group of 30 patients with IDDM and 30 age, sex and blood pressure matched control subjects underwent traditional tests of autonomic function. In addition, baroreceptor-cardiac reflex sensitivity (BRS) was assessed using time domain (sequence) analysis of systolic blood pressure and pulse interval data recorded non-invasively using the Finapres beat-to-beat blood pressure recording system. 'Up BRS' sequences-increases in systolic blood pressure associated with lengthening of R-R interval, and 'down BRS' sequences-decreases in systolic blood pressure associated with shortening of R-R interval were identified and BRS calculated from the regression of systolic blood pressure on R-R interval for all sequences. We also assessed heart rate variability using power spectral analysis and, after expressing components of the spectrum in normalised units, assessed sympathovagal balance from the ratio of low to high frequency powers. IDDM subjects underwent 2-D echocardiography to assess left ventricular mass index. Standard tests of autonomic function revealed no differences between IDDM patients and control subjects, but dramatic reductions in baroreceptor-cardiac reflex sensitivity were detected in IDDM patients. 'Up BRS' when supine was 11.2 +/- 1.5 ms/mmHg (mean +/- SEM) compared with 20.4 +/- 1.95 in control subjects (p < 0.003) and when standing was 4.1 +/- 1.9 vs 7.6 +/- 2.7 ms/mmHg (p < 0.001). Down BRS when supine was 11.5 +/- 1.2 vs 22 +/- 2.6 (p < 0.001) and standing was 4.4 +/- 1.9 vs 7.3 +/- 2.5 ms/mmHg (p < 0.003). There were significant relations between impairment of the baroreflex and duration of diabetes (p < 0.001) and poor glycaemic control (p < 0.001). From a fast Fourier transformation of supine heart rate data and using a band width of 0.05-0.15 Hz as low-frequency and 0.2-0.35 Hz as high frequency total spectral power of R-R interval variability was significantly reduced in the IDDM group for both low-frequency (473 +/- 62.8 vs 746.6 +/- 77.6 ms2 p = 0.002) and high frequency bands 125.2 +/- 12.9 vs 459.3 +/- 89.8 ms2 p < 0.0001. When the absolute powers were expressed in normalised units the ratio of low frequency to high frequency power (a measure of sympathovagal balance) was significantly increased in the IDDM group (2.9 +/- 0.53 vs 4.6 +/- 0.55, p < 0.002 supine: 3.8 +/- 0.49 vs 6.6 +/- 0.55, p < 0.001 standing). Thus, time domain analysis of baroreceptor-cardiac reflex sensitivity detects autonomic dysfunction more frequently in IDDM patients than conventional tests. Impaired BRS is associated with an increased left ventricular mass index and this abnormality may have a role in the increased incidence of sudden death seen in young IDDM patients. 相似文献
65.
66.
67.
Both poverty and other factors associated with race are related to child health. However, the mechanisms of these relationships have not been adequately specified. The purpose of this study was to explore the relationship of the social environment to child health status in black and white children and further, to explore whether the patterns of the effects of social class were different by race. This study provides further evidence that the social environment is strongly associated with child health status. Several risk factors are similar for both white and black children: mothers who view their own health as fair or poor are much more likely to rate their children in poor health. The presence of childhood chronic medical conditions is independently associated with poor health status regardless of race. However, the relative importance of several social risks for poor health status differs between white and black children. Specifically, while low family income is a consistent risk factor for poor health among white children, low income alone is not a risk factor for black children. Among black children, other social risks that are associated with poverty, such as low maternal education and a mother's perception of her own health as poor, increased the risk of poorer health in the child. 相似文献
68.
DM Haig A Percival J Mitchell I Green D Sargan 《Canadian Metallurgical Quarterly》1995,45(3-4):221-236
An in vitro culture system is described which allows an analysis of the signals responsible for the survival, growth and functional maturation of afferent lymph dendritic cells (ALDC), a subpopulation of migrating dermal dendritic cells involved in antigen carriage and presentation to T-cells. Purified ALDC survived and grew for up to 30 days in lymph node conditioned medium and survived 14 days in recombinant ovine (rov) TNF-alpha whereas none were detected after 24 h in rov GM-CSF, rov IFN-gamma or rh M-CSF. However, when rov GM-CSF was added to cultures along with rov TNF-alpha, increased numbers of ALDC compared with input numbers (growth) were recorded on Days 14 and 21. In contrast, when 50-200 units ml-1 of rov IFN-gamma were added to cultures of ALDC along with TNF-alpha or rov TNF-alpha plus rov GM-CSF, cell survival and growth was inhibited. Antibody blocking studies confirmed the cytokine specificity of these effects. ALDC cultured in rov TNF-alpha or rov TNF-alpha plus rov GM-CSF retained MHC Class-II and ov CD-1 antigen expression and accessory function for autologous ov CD-4 T-cell proliferation, although at reduced levels compared with freshly isolated cells. Neither fresh nor cultured ALDC expressed coagulation factor XIIIa. 相似文献
69.
Precision edge contrast and orientation estimation 总被引:14,自引:0,他引:14
Lyvers E.P. Mitchell O.R. 《IEEE transactions on pattern analysis and machine intelligence》1988,10(6):927-937
The contrast and orientation estimation accuracy of several edge operators that have been proposed in the literature is examined both for the noiseless case and in the presence of additive Gaussian noise. The test image is an ideal step edge that has been sampled with a square-aperture grid. The effects of subpixel translations and rotations of the edge on the performance of the operators are studied. It is shown that the effect of subpixel translations of an edge can generate more error than moderate noise levels. Methods with improved results are presented for Sobel angle estimates and the Nevatia-Babu operator, and theoretical noise performance evaluations are also provided. An edge operator based on two-dimensional spatial moments is presented. All methods are compared according to worst-case and RMS error in an ideal noiseless situation and RMS error under various noise levels 相似文献
70.