全文获取类型
收费全文 | 349篇 |
免费 | 9篇 |
国内免费 | 2篇 |
学科分类
工业技术 | 360篇 |
出版年
2023年 | 5篇 |
2022年 | 9篇 |
2021年 | 19篇 |
2020年 | 11篇 |
2019年 | 10篇 |
2018年 | 11篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 3篇 |
2014年 | 12篇 |
2013年 | 19篇 |
2012年 | 18篇 |
2011年 | 36篇 |
2010年 | 23篇 |
2009年 | 15篇 |
2008年 | 25篇 |
2007年 | 12篇 |
2006年 | 19篇 |
2005年 | 9篇 |
2004年 | 11篇 |
2003年 | 7篇 |
2002年 | 7篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1982年 | 6篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1977年 | 4篇 |
1969年 | 2篇 |
排序方式: 共有360条查询结果,搜索用时 15 毫秒
21.
22.
George A Manganaris Vlasios Goulas Ariel R Vicente Leon A Terry 《Journal of the science of food and agriculture》2014,94(5):825-833
Small berry fruits are consumed because of their attractive colour and special taste, and are considered one of the richest sources of natural antioxidants. Their consumption has been linked to the prevention of some chronic and degenerative diseases. The term ‘berry fruits’ encompasses the so‐called ‘soft fruits’, primarily strawberry, currants, gooseberry, blackberry, raspberry, blueberry and cranberry. The objective of this review is to highlight the nutraceutical value of berries and to summarize the factors affecting berry fruit antioxidants. Particular attention is given to postharvest and processing operation factors that may affect fruit phytochemical content. The structure–antioxidant relationships for phenolic compounds – the main group of antioxidants in this fruit group – are presented and major areas for future research are identified. © 2013 Society of Chemical Industry 相似文献
23.
Ari Geiger Ephraim Nissan Ariel Stollman 《Information & Communications Technology Law》2001,10(1):21-37
For the purposes of starting to tackle, within artificial intelligence (AI), the narrative aspects of legal narratives in a criminal evidence perspective, traditional AI models of narrative understanding can arguably supplement extant models of legal narratives from the scholarly literature of law, jury studies, or the semiotics of law. Not only: the literary (or cinematic) models prominent in a given culture impinge, with their poetic conventions, on the way members of the culture make sense of the world. This shows glaringly in the sample narrative from the Continent-the Jama murder, the inquiry, and the public outcry-we analyse in this paper. Apparently in the same racist crime category as the case of Stephen Lawrence's murder (in Greenwich on 22 April 1993) with the ensuing still current controversy in the UK, the Jama case (some 20 years ago) stood apart because of a very unusual element: the eyewitnesses identifying the suspects were a group of football referees and linesmen eating together at a restaurant, and seeing the sleeping man as he was set ablaze in a public park nearby. Professional background as witnesses-cum-factfinders in a mass sport, and public perceptions of their required characteristics, couldn't but feature prominently in the public perception of the case, even more so as the suspects were released by the magistrate conducting the inquiry. There are sides to this case that involve different expected effects in an inquisitorial criminal procedure system from the Continent, where an investigating magistrate leads the inquiry and prepares the prosecution case, as opposed to trial by jury under the Anglo-American adversarial system. In the JAMA prototype, we tried to approach the given case from the coign of vantage of narrative models from AI. 相似文献
24.
De Cremer David; Brockner Joel; Fishman Ariel; van Dijke Marius; van Olffen Woody; Mayer David M. 《Canadian Metallurgical Quarterly》2010,95(2):291
Prior research has shown that procedural fairness interacts with outcome fairness to influence employees’ work attitudes (e.g., organizational commitment) and behaviors (e.g., job performance, organizational citizenship behavior), such that employees’ tendencies to respond more positively to higher procedural fairness are stronger when outcome fairness is relatively low. In the present studies, we posited that people’s uncertainty about their standing as organizational members would have a moderating influence on this interactive relationship between procedural fairness and outcome fairness, in that the interactive relationship was expected to be more pronounced when uncertainty was high. Using different operationalizations of uncertainty of standing (i.e., length of tenure as a proxy, along with self-reports and coworkers’ reports), we found support for this hypothesis in 4 field studies spanning 3 different countries. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
25.
J. Arturo Olvera-López J. Ariel Carrasco-Ochoa J. Francisco Martínez-Trinidad Josef Kittler 《Artificial Intelligence Review》2010,34(2):133-143
In supervised learning, a training set providing previously known information is used to classify new instances. Commonly,
several instances are stored in the training set but some of them are not useful for classifying therefore it is possible
to get acceptable classification rates ignoring non useful cases; this process is known as instance selection. Through instance
selection the training set is reduced which allows reducing runtimes in the classification and/or training stages of classifiers.
This work is focused on presenting a survey of the main instance selection methods reported in the literature. 相似文献
26.
Ariel Burgos Hernán Svoboda Zhuyao Zhang Estela Surian 《Journal of Materials Engineering and Performance》2018,27(12):6328-6338
Creep-resistant 9Cr steels are extremely important in thermal power generation industry due to their marked resistance to creep and corrosion. The weldability of these alloys is critical since they are used in welded construction equipment. The required mechanical properties are achieved after post-weld heat treatment. This study examined the effect of different post-weld heat treatments on microstructure and mechanical properties of creep strength-enhanced 9Cr steel welding deposits. It was obtained with an experimental flux-cored arc welding wire used under protective gas (Ar-20% CO2). The heat treatments used were: (1) tempering (760 °C?×?2 h), (2) solubilizing (1050 °C?×?1 h)?+?tempering (760 °C?×?2 h) and (3) solubilizing (1150 °C?×?1 h)?+?first tempering (660 °C?×?3 h)?+?second tempering (660 °C?×?3 h). All-weld metal chemical composition was analyzed, and hot tensile tests were carried out at different temperatures. Charpy-V impact tests and Vickers microhardness measurements were also performed. Microstructures were studied using x-ray diffraction and optical and scanning electron microscopy. In all cases, a martensitic matrix with intergranular and intra-granular precipitates was detected. In the as-welded condition, δ-ferrite was also found. Microhardness dropped, and the impact energy increased with post-weld heat treatments. The highest hot tensile strength result was achieved with samples submitted to austenization at 1150 °C and double tempering at 660 °C. 相似文献
27.
Gamboa Delgado EM López Barbosa N Prada Gómez GE Franco Cadena JT Landínez Navarro A 《Archivos latinoamericanos de nutrición》2010,60(3):247-253
The objective of this study was to determine associated factors to the consumption of fruit and vegetables (FV) in the adult population of each socioeconomic status (SES) in Bucaramanga, Colombia. We conducted a cross-sectional in a sample of 317 people and we measured socio-demographic, economic and anthropometric variables and dietary factors related to the purchase and consumption of FV. We made a survey, a 24-Hour dietary recall and we did anthropometric measurements. Portion sizes were estimated with a standardized set of utensils and food-photography atlas. Frequencies, measures of central tendency and dispersion were established and Logistic Regression models were used for the bi and multivariate analysis. Average consumption of FV was 162.6 g/day (188.5 g in high SES and 145.7 g in low SES, p = 0.056). On average 2 servings per day of FV (2.3 servings in high SES and 1.5 in low SES, p = 0.055). The prevalence of adequate intake of FV (more than 5 servings / day) was 8.6% (8.9% in high SES and 8.4% in low SES, p = 0.896). The associated factor to consumption of FV was BMI > or =25 (OR: 0.31, CI (95%): 0.11-0.89, p = 0.030), adjusted for occupation, income, SES, and number of family members. FV consumption is low; excess weight is the only variable associated to no-consumption of five or more servings; causes: cost to the consumption of fruit and flavor in the case of vegetables. 相似文献
28.
Manuela Tosin Dr. Lorena Betancor Dr. Elaine Stephens Dr. W. M. Ariel Li Peter F. Leadlay Prof. 《Chembiochem : a European journal of chemical biology》2010,11(4):539-546
Modular biocatalysis is responsible for the generation of countless bioactive products and its mining remains a major focus for drug discovery purposes. One of the enduring hurdles is the isolation of biosynthetic intermediates in a readily‐analysed form. We prepared a series of nonhydrolysable pantetheine and N‐acetyl cysteamine mimics of the natural (methyl)malonyl extender units recruited for polyketide formation. Using these analogues as competitive substrates, we were able to trap and off‐load diketide and triketide species directly from an in vitro reconstituted type I polyketide synthase, the 6‐deoxyerythronolide B synthase 3 (DEBS3). The putative intermediates, which were extracted in organic solvent and characterised by LC‐HR‐ESI‐MS, are the first of their kind and prove that small‐molecule chain terminators can be used as convenient probes of the biosynthetic process. 相似文献
29.
Santosh K. Nanda Ariel L. Rivas William M. Trochim J. David Deshler 《Scientometrics》2000,48(1):45-64
The emphasis of validity as a publication content was investigated in dissertations and journal articles. The time of first publication, longitudinal publication profile, ratio of articles to dissertations, and time lag between dissertations and articles emphasizing validity were compared within and among various fields. A three-decade gap separated the first field adopting validity-related contents in its dissertations from the latest fields that did so. The longitudinal data suggested three groups of fields (Agricultural Sciences, Applied Sciences and Social Sciences) which showed consistent differences among groups and consistent similarities within groups in their emphasis on validity-related content. Adoption of validity-related content in dissertations always preceded adoption of validity-related content in journal articles. On average, less than 4% of journal articles included validity-related content across fields. These findings support the hypothesis that validity has been introduced and disseminated within fields following patterns predicted by diffusion of innovations theory. It is argued that this pattern is inconsistent with an efficient and interdisciplinary utilization of available knowledge. Policy recommendations are made for developing strategic communication and education programs for academicians and journal reviewers. 相似文献
30.
Ariel 《建筑装饰材料世界》2006,(6):44-49
受亚洲文化影响所设计的“佛之吧”,在巴黎繁衍出不计其数的效仿者。具有摩洛哥风格的水池形成了一处清凉宁静的景致,与浅橙色的墙壁以及耀眼的金箔柱子形成了强烈对比。两具巨大的印度乐人雕像突出于墙壁位于水池的两侧,而这个水池又能够被覆盖,从而形成一个舞台来进行现场音乐表演。>这个酷似洞穴的酒吧内部处处彰显着受到亚洲影响的细节,从色彩斑斓的曼荼罗图案的天花板到印度乐人的雕塑,以及神色宁静的半身雕像也为两个大软椅增色不少。理念的融会与繁衍是一个自然的过程——比如酒馆从欧洲传入新大陆,又比如“迪斯科舞厅”一词来源于法… 相似文献