全文获取类型
收费全文 | 229篇 |
免费 | 7篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 20篇 |
金属工艺 | 1篇 |
机械仪表 | 3篇 |
建筑科学 | 13篇 |
矿业工程 | 3篇 |
能源动力 | 11篇 |
轻工业 | 55篇 |
水利工程 | 4篇 |
石油天然气 | 1篇 |
无线电 | 13篇 |
一般工业技术 | 23篇 |
冶金工业 | 55篇 |
自动化技术 | 32篇 |
出版年
2023年 | 2篇 |
2022年 | 6篇 |
2021年 | 6篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 19篇 |
2012年 | 12篇 |
2011年 | 20篇 |
2010年 | 11篇 |
2009年 | 6篇 |
2008年 | 17篇 |
2007年 | 13篇 |
2006年 | 7篇 |
2005年 | 12篇 |
2004年 | 7篇 |
2003年 | 8篇 |
2002年 | 6篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有236条查询结果,搜索用时 10 毫秒
11.
Jessica Schoffelen Sandy Claes Liesbeth Huybrechts Sarah Martens Alvin Chua Andrew Vande Moere 《CoDesign》2015,11(3-4):179-192
In this paper, we will be discussing how visualisations can facilitate participatory processes by way of conveying issues of public concern as ‘things’. In the line of Latour’s plea to ‘make things public’, visualisations can be purposefully designed to trigger and encourage public debates concerning a wide range of issues. For this, we explore how a visualisation can be both transparent (i.e. visualising the complex entanglement of backstories of an issue) and readable. Specifically, we clarify the aspect of designing a readable visualisation of ‘things’. First, drawing from different fields of literature (i.e. Information Visualisation, Science and Technology Studies and Human-Computer-Interaction) we will articulate three main aspects of readability: engaging people to interact with a visualisation of complex issues, supporting sense making and encouraging reflection. Then, based on three empirical case studies, we indicate different design considerations in terms of engaging people to interact with a visualisation: contextualising a visualisation (via its location or medium), staging interaction and allowing people to provide their own perspective on the issue displayed. As a conclusion we propose a scenario that allows the visualisation to gradually become more transparent in support of its readability. 相似文献
12.
Tucker Sean; Chmiel Nik; Turner Nick; Hershcovis M. Sandy; Stride Chris B. 《Canadian Metallurgical Quarterly》2008,13(4):319
In the present study, we modeled 2 sources of safety support (perceived organizational support for safety and perceived coworker support for safety) as predictors of employee safety voice, that is, speaking out in an attempt to change unsafe working conditions. Drawing on social exchange and social impact theories, we hypothesized and tested a mediated model predicting employee safety voice using a cross-sectional survey of urban bus drivers (n = 213) in the United Kingdom. Hierarchical regression analysis showed that perceived coworker support for safety fully mediated the relationship between perceived organizational support for safety and employee safety voice. This study adds to the employee voice literature by evaluating the important role that coworkers can play in encouraging others to speak out about safety issues. Implications for research and practice related to change-oriented safety communication are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
13.
Muzaffer Tonguc Oztek Michael D. Hampton Darlene K. Slattery Sandy Loucks 《International Journal of Hydrogen Energy》2011,36(11):6705-6710
Hydrogen interaction of porphyrin hetero-pairs has been studied by differential scanning calorimetry (DSC). Aggregates were prepared by spontaneous aggregation of water soluble anionic porphyrins meso-tetra(4-carboxyphenyl)porphine (TCPP) and meso-tetra(4-sulfonatophenyl)porphine (TPPS) with cationic meso-tetra-p-trimethylaminophenyl porphine tetrachloride (TAP). Aggregate formation in solution was investigated via UV-visible spectroscopy at different pH ranges. At neutral to basic conditions, porphyrin pairs formed partially soluble hetero H-aggregates and at low pH, soluble homo J-aggregates was formed. H-aggregates were isolated by centrifuging and freeze-drying. The obtained solids were studied by X-ray powder diffraction. Thermal stability of dry aggregates was determined by thermogravimetric analysis. The TCPP-TAP hetero aggregates exhibited hydrogen uptake between 80 °C and 250 °C. The amount of hydrogen absorbed by the sample corresponds to 0.29% by weight, indicating a potential use of such materials as a solid state hydrogen storage medium. 相似文献
14.
Porous Perovskite Fibers – Preparation by Wet Phase Inversion Spinning and Catalytic Activity 下载免费PDF全文
Sandy Kaiser Erik Reichelt Sylvia E. Gebhardt Matthias Jahn Alexander Michaelis 《化学工程与技术》2014,37(7):1146-1154
Porous perovskite (LaMnO3) fibers were prepared by means of wet phase inversion spinning. The influence of different spinning procedures, slurry and coagulation bath composition on fiber shape and pore morphology was studied. The catalytic activity of the prepared fibers was tested for carbon monoxide oxidation as a model reaction in a differential recycle reactor. The results revealed that by suitable choice of process conditions porous catalytically active fibers can be prepared. Catalytic measurements confirmed that the catalytic fibers exhibit an open structure that allows full utilization of the catalytically active surface without intraparticle diffusional limitations. 相似文献
15.
Case Study – The Making of an Institutional Crisis: The Mass Release of Inmates by a Correctional Agency 下载免费PDF全文
A US state correctional agency inadvertently released a large numbers of inmates before expiration of their sentences. This created an institutional crisis, for three reasons. First, the correctly timed release of inmates is unequivocally central the agency's core mission. Second, the early releases were consequential, in that serious crimes were committed by those only out of prison because of early release. Third, a citizen alerted the agency of an early‐release calculation for a particular offender, but the agency failed to act on this information. The correctional agency responded to this crisis by changing both its operating procedure and its culture. 相似文献
16.
This article examined the relationships and outcomes of behaviors falling at the interface of general and sexual forms of interpersonal mistreatment in the workplace. Data were collected with surveys of two different female populations (Ns=833 and 1,425) working within a large public-sector organization. Findings revealed that general incivility and sexual harassment were related constructs, with gender harassment bridging the two. Moreover, these behaviors tended to co-occur in organizations, and employee well-being declined with the addition of each type of mistreatment to the workplace experience. This behavior type (or behavior combination) effect remained significant even after controlling for behavior frequency. The findings are interpreted from perspectives on sexual aggression, social power, and multiple victimization. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
17.
Wills Thomas Ashby; Yaeger Alison M.; Sandy James M. 《Canadian Metallurgical Quarterly》2003,17(1):24
This research examined the hypothesis that religiosity buffers the impact of life stress on adolescent substance use. Data were from a sample of 1,182 participants surveyed on 4 occasions between 7th grade (mean age = 12.4 years) and 10th grade. Religiosity was indexed by Jessor's Value on Religion Scale (R. Jessor & S. L. Jessor, 1977). Zero-order correlations showed religiosity inversely related to alcohol, tobacco, and marijuana use. Significant Life Events×Religiosity buffer interactions were found in cross-sectional analyses for tobacco, alcohol, and marijuana use. A latent growth analysis showed that religiosity reduced the impact of life stress on initial level of substance use and on rate of growth in substance use over time. Implications for further research on religiosity and substance use are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
18.
Stefanie Christiaens Sandy Van Buggenhout Ken Houben Ilse Fraeye Ann M. Van Loey Marc E. Hendrickx 《Food research international (Ottawa, Ont.)》2011,44(6):1604-1612
To investigate the structure-function relationship of pectin during (pre)processing, broccoli samples (Brassica oleracea L. cultivar italica) were subjected to one of the following pretreatments: (i) low-temperature blanching (LTB), (ii) LTB in combination with Ca2+ infusion, (iii) high-pressure pretreatment (HP), (iv) HP in combination with Ca2+ infusion, or (v) no pretreatment (control sample), whether or not in combination with a thermal treatment of 15 min at 90 °C. The macroscopic attributes of broccoli were linked to the chemical structure of broccoli pectin. By enhancing the cross-linking of pectic polymers, both LTB and HP reduced the texture loss that occurred during thermal processing of broccoli. During these pretreatments, homogalacturonan was de-esterified by pectin methylesterase, which led to changes in pectin solubility. When LTB or HP was combined with Ca2+ infusion, changes in the structure of pectin occurred, however not always reflected at the macroscopic level. The degree of esterification of pectin in Ca2+-soaked broccoli samples was lower compared to non-Ca2+-soaked samples and, in addition, a higher amount of ionically cross-linked pectin was retrieved. 相似文献
19.
On-Line Algorithms for the Dynamic Traveling Repair Problem 总被引:1,自引:0,他引:1
We consider the dynamic traveling repair problem in which requests with deadlines arrive through time on points in a metric
space. Servers move from point to point at constant speed. The goal is to plan the motion of servers so that the maximum number
of requests are met by their deadline. We consider a restricted version of the problem in which there is a single server and
the length of time between the arrival of a request and its deadline is constant. We give upper bounds for the competitive
ratio of two very natural algorithms as well as several lower bounds for any deterministic algorithm. Most of the results
in this paper are expressed as a function of β, the diameter of the metric space. In particular, we prove that the upper bound
given for one of the two algorithms is within a constant factor of the best possible competitive ratio. 相似文献
20.
Kraimer Maria L.; Wayne Sandy J.; Liden Robert C.; Sparrowe Raymond T. 《Canadian Metallurgical Quarterly》2005,90(2):389
On the basis of psychological contract and social cognition theories, the authors explored the role of full-time employees' perceived job security in explaining their reactions to the use of temporary workers by using a sample of 149 full-time employees who worked with temporaries. As hypothesized, employees' perceived job security negatively related to their perceptions that temporaries pose a threat to their jobs, but it did not relate to their perceptions that temporaries are beneficial. Furthermore, employees' job security moderated the relationships between benefit and threat perceptions and supervisor ratings of job performance. For those with high job security, there was a positive relationship between benefit perceptions and performance. For those with low job security, there was a negative relationship between threat perceptions and performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献