全文获取类型
收费全文 | 576篇 |
免费 | 15篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 119篇 |
金属工艺 | 4篇 |
机械仪表 | 6篇 |
建筑科学 | 30篇 |
矿业工程 | 1篇 |
能源动力 | 5篇 |
轻工业 | 60篇 |
水利工程 | 10篇 |
无线电 | 26篇 |
一般工业技术 | 119篇 |
冶金工业 | 142篇 |
原子能技术 | 4篇 |
自动化技术 | 59篇 |
出版年
2022年 | 2篇 |
2021年 | 12篇 |
2020年 | 6篇 |
2019年 | 12篇 |
2018年 | 8篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 8篇 |
2014年 | 6篇 |
2013年 | 33篇 |
2012年 | 23篇 |
2011年 | 40篇 |
2010年 | 35篇 |
2009年 | 30篇 |
2008年 | 29篇 |
2007年 | 39篇 |
2006年 | 31篇 |
2005年 | 33篇 |
2004年 | 16篇 |
2003年 | 14篇 |
2002年 | 15篇 |
2001年 | 6篇 |
2000年 | 15篇 |
1999年 | 9篇 |
1998年 | 19篇 |
1997年 | 11篇 |
1996年 | 9篇 |
1995年 | 13篇 |
1994年 | 9篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 8篇 |
1975年 | 6篇 |
1974年 | 4篇 |
1973年 | 2篇 |
1969年 | 2篇 |
排序方式: 共有591条查询结果,搜索用时 15 毫秒
101.
Majowicz SE McNab WB Sockett P Henson TS Doré K Edge VL Buffett MC Fazil A Read S McEwen S Stacey D Wilson JB 《Journal of food protection》2006,69(3):651-659
This study estimated the health burden and costs associated with gastroenteritis in the City of Hamilton (Ontario, Canada). The number of cases, number of different resource units used, and cost per resource unit were represented by probability distributions and point estimates. These were subsequently integrated in a stochastic model to estimate the overall burden and cost in the population and to depict the uncertainty of the estimates. The estimated mean annual cost per capita was Can dollar 115. The estimated mean annual cost per case was Can dollar 1,089 and was similar to other published figures. Gastroenteritis represented a significant burden in the study population, with costs high enough to justify prevention efforts. These results, currently the most accurate available estimates for a Canadian population, can inform future economic evaluations to determine the most cost effective measures for reducing the burden and cost of gastroenteritis in the community. 相似文献
102.
Kaltman Stacey; Green Bonnie L.; Mete Mihriye; Shara Nawar; Miranda Jeanne 《Canadian Metallurgical Quarterly》2010,2(1):31
Trauma exposure is frequently overlooked as a risk factor for psychiatric morbidity among studies with Latinos. The purpose of this study was to examine the relationships among trauma history, immigration-related factors, and mental health status among Latina immigrants. The current study used baseline data from a randomized clinical trial for the treatment of depression of 64 women with comorbid posttraumatic stress disorder and depression, 69 with depression-only, and 61 with no Axis I mental disorder. Sixty-four percent of the sample was Central American and 75% reported trauma exposure. Multinomial logit analysis suggested fewer years in the United States was associated with worse mental health status. Having a nonmarried marital status was also associated with worse mental health. Reporting four or more types of traumatic events was associated with an increase in the probability of comorbidity. These findings have important implications for future research and clinical practice. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
103.
Montpetit Mignon A.; Bergeman C. S.; Deboeck Pascal R.; Tiberio Stacey S.; Boker Steven M. 《Canadian Metallurgical Quarterly》2010,25(3):631
Resilience is often considered both a trait and a process. The current study proposes a new way to conceptualize resilience-as-process based on dynamical systems modeling, which allows researchers to capture the process of stress management in real time. Coupled damped linear oscillator models succinctly describe daily stress and negative affect in terms of developmental forces (e.g., velocity, acceleration). Models were fit to 56-day daily response data from 42 aging adults (Mage = 78.8 years; SDage = 6.6 years) to observe and understand linkages between daily stress and affect. It was speculated that individuals with greater resilience would experience stress as less coupled to changes in negative affect (less stress reactivity), and would recover their affective equilibrium more quickly following a given exogenous stressor (greater stress recovery). To identify resilience resources related to reliable interindividual differences in coupling and damping between stress and negative affect, we examined possible protective factors. Aspects of personality and social support predicted both the strength and nature of this coupling, such that higher levels of these resources resulted in greater protection from the cost to negative affect from stress, as observed in damping of negative affect and decreased coupling between systems. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
104.
105.
Christelle Schaffer-Lequart Undine Lehmann Alastair B. Ross Olivier Roger Alison L. Eldridge Edwin Ananta 《Critical reviews in food science and nutrition》2017,57(8):1562-1568
Some countries now incorporate recommendations for increased consumption of whole grain (WG) into local dietary guidelines. Cereal and pseudo-cereal grains are good sources of complex carbohydrates, dietary fiber, proteins, phytochemicals, vitamins and minerals. However, research shows that the large majority of consumers are still falling short of WG consumption goals. To address this, we are actively involved in research to help increase the WG content of processed foods without compromising on taste and texture. In order to ensure consumer trust, the advancement of process technologies in incorporating WG to produce tasty food has to go hand in hand with well designed clinical trials that confirm the health benefits resulting from diets rich in WG. 相似文献
106.
Herring and chicken/pork meals lead to differences in plasma levels of TCA intermediates and arginine metabolites in overweight and obese men and women 下载免费PDF全文
107.
A casein hydrolysate protects mice against high fat diet induced hyperglycemia by attenuating NLRP3 inflammasome‐mediated inflammation and improving insulin signaling 下载免费PDF全文
Niamh P. Healy Anna M. Kirwan Maeve A. McArdle Kieran Holohan Alice B. Nongonierma Deirdre Keane Stacey Kelly Lucia Celkova Claire L. Lyons Fiona C McGillicuddy Orla M Finucane Brian A. Murray Philip M. Kelly Lorraine Brennan Richard J. FitzGerald Helen M. Roche 《Molecular nutrition & food research》2016,60(11):2421-2432
108.
Li Z Knight S Cook LJ Hyde LK Holubkov R Olson LM 《Accident; analysis and prevention》2008,40(2):835-839
Motor vehicle crashes are a leading cause of death for young people in the United States. Assessing which drivers are at a high risk of experiencing a crash is important for the implementation of traffic regulations. Illegal street racing has been associated with a high rate of motor vehicle crashes. In this study, we link Utah statewide driver license citations and motor vehicle crash data to evaluate the rate of crashes for drivers with street racing citations relative to other drivers. Using a zero-inflated negative binomial model we found that drivers with no citations are approximately three times more likely to be at zero risk of a crash compared to drivers with street racing citations. Moreover, among drivers at non-negligible risk of crash, cited street racers are more likely to be involved in a crash compared to drivers without citations or those cited for violations other than street racing. However, drivers with increased numbers of non-street-racing citations experience crash risks approaching those of the cited street racers. 相似文献
109.
This article proposes methods for testing the null hypothesis that a number of so‐called long run canonical correlations (LRCCs) are zero. Two test statistics are proposed and their limiting distributions are derived under the null hypothesis. The finite sample properties of the tests are illustrated via a number of simulation studies that reveal the asymptotic theory provides a good guidance to behaviour in moderate or large sized samples. It is shown that the statistics provide a natural way for testing the asymptotic independence of two standardized sums. The usefulness of the tests is illustrated via the following examples: inference about cointegrating vector in a particular cointegration model; inference about break points in a cointegration model; moment estimation; parameter estimation in Generalized Method of Moments estimation. 相似文献
110.