全文获取类型
收费全文 | 401篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 4篇 |
化学工业 | 76篇 |
金属工艺 | 3篇 |
机械仪表 | 1篇 |
建筑科学 | 39篇 |
能源动力 | 10篇 |
轻工业 | 43篇 |
石油天然气 | 13篇 |
无线电 | 10篇 |
一般工业技术 | 48篇 |
冶金工业 | 126篇 |
原子能技术 | 2篇 |
自动化技术 | 38篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 11篇 |
2020年 | 4篇 |
2019年 | 8篇 |
2018年 | 11篇 |
2017年 | 5篇 |
2016年 | 12篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 32篇 |
2012年 | 12篇 |
2011年 | 26篇 |
2010年 | 19篇 |
2009年 | 20篇 |
2008年 | 25篇 |
2007年 | 25篇 |
2006年 | 12篇 |
2005年 | 15篇 |
2004年 | 15篇 |
2003年 | 9篇 |
2002年 | 13篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 9篇 |
1997年 | 10篇 |
1996年 | 9篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 9篇 |
1991年 | 2篇 |
1990年 | 8篇 |
1989年 | 7篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有413条查询结果,搜索用时 0 毫秒
1.
In these times of global change, many facility emphases are competing for limited resources. Competing factors include, but are not limited to, sustainable design or green buildings; security, hardening or force protection; accessibility; historic preservation; aesthetics; and functionality. Yet, unlimited resources are seldom, if ever, available to fulfill all of these competing requirements in private or public construction. The Georgia Institute of Technology designed a decision matrix to allow owners and planners to balance these competing requirements on a project-by-project basis and to document the rationale. 相似文献
2.
Haynes Stephen N.; Lemsky Carolyn; Sexton-Radek Kathy 《Canadian Metallurgical Quarterly》1987,18(5):515
Findings from several studies have indicated that the scientist-practitioner model (which stresses the integration of research into clinical practice) is infrequently adopted by practicing clinical psychologists. Although many hypotheses have been offered, there have been no empirical examinations of the reasons why clinicians infrequently engage in research. In this study, 79 practicing clinical psychologists completed a questionnaire focusing on perceived impediments to clinical research. A number of inhibiting factors were identified, but the intrinsic and extrinsic contingencies associated with the conduct of research were most salient. Other concerns included ethics, the impact of research on the clinical process, and the unavailability of appropriate research designs. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
3.
4.
Kathy A. Northcott Ian Snape Peter J. Scales Geoff W. Stevens 《Chemical engineering science》2005,60(24):6835-6843
Sludge reduction and dewatering is an important aspect of water and waste water treatment. This is especially true in the case of Australia's Antarctic contaminated site remediation program, where the reduction in volume of wastes to be returned to Australia can lead to significant transport and handling cost savings. The dewatering characterisation of water treatment sludges from an Antarctic contaminated site was conducted using a theory of suspension dewatering developed by Buscall, Landman and White. This theory uses fundamental material properties of compressibility and permeability to determine the diffusivity of a suspension. Diffusivity is a useful property that can be used to directly compare the dewaterability of various sludges. In this investigation, several water treatment sludges were collected and characterised in the field to determine the impact of temperature and additives on compressibility, permeability and diffusivity. The Antarctic sludges were found to be less compressible and less permeable than materials such as mineral suspensions and alum water treatment sludges. Compressibility was found to decrease with the addition of powdered coagulation aids such as bentonite and chitosan. 相似文献
5.
Sihua Xu Glenn W. Patterson William R. Lusby Kathy M. Schmid Thomas A. Salt 《Lipids》1990,25(1):61-64
Twenty-one species in the Chenopodiaceae were analyzed for sterol composition. In ten of eleven species ofChenopodium, the major desmethylsterols were Δ7-sterols accompanied by lower proportions of Δ5-sterols. InC. fremontii this pattern was reversed. The sterol profiles of five species ofAtriplex were characterized by the coexistence of Δ7- and Δ5-sterols in ratios of 0.3∶1 to 0.4∶1. MaleAtriplex plants contained higher proportions of Δ5-sterols than femaleAtriplex plants. OneCeratoides and twoSalicornia species contained Δ5-sterols as their predominant sterols. 相似文献
6.
Flash pyrolysis, which combines conventional pyrolysis with flash sintering, was first conducted to produce polymer derived SiC-TiC nanocomposites. Pre-pyrolysis at 800℃ allows the conversion from titanium isopropoxide (TTIP) modified polysiloxane to an amorphous SiTiOC ceramic. The subsequent application of an electric field gives rise to the formation of turbostratic carbon and creates Joule heating to obtain a sample internal temperature of ~1400℃. The precipitation of β-SiC, TiC, as well as titanium oxides is realized upon carbothermal reduction of extensively phase separated SiO2 and TiO2 with carbon. Increasing TTIP content embodies the nanocomposites with prominent electrical percolation behaviors. The electrical transport of the synthesized ceramics follows an amorphous semiconductor mechanism. High thermal stability in air is guaranteed, thanks to the in-situ formed TiC nanocrystals and preferentially reduced amorphous carbon. Flash pyrolyzed nanocomposite with a Ti:Si molar ratio of 0.20 exhibits the highest electrical conductivity (0.696 S/cm) and minimum mass change (~2%) at 1000℃, serving as a competitive candidate for electro-discharge machining (EDM) applications or self-standing conducting devices that must withstand high temperature conditions. 相似文献
7.
Kathy Shields 《国际互联网参考资料服务季刊》2013,18(3-4):207-218
In Spring 2012, instruction librarians collaborated with first year composition (FYC) faculty to study students’ research habits as they related to writing. We collected process narratives from students in the introductory FYC course at the beginning and end of the fall semester, and a group of librarians and FYC faculty coded them together. Although we did not achieve one of our initial research goals, we still gained valuable insight into how our students perceive sources and the research process. We applied what we learned to create new instructional materials and developed a valuable relationship with FYC faculty. 相似文献
8.
Dharani Perera R. T. Jim Eales Kathy Blashki 《Universal Access in the Information Society》2009,8(2):77-88
For people with upper limb disabilities visual art is an important activity that allows for expression of individuality and
independence. They show remarkable endurance, patience and determination to adapt their remaining capabilities to create visual
art. There are significant advantages of digital technologies in assisting artists with upper limb disabilities. Paralinguistic
voice recognition technologies have proven to be a particularly promising mode of interaction. Despite these benefits, technological
support for people with upper limb disabilities to create visual art is scarce. This paper reports on a number of case studies
of several artists with upper limb disabilities. These case studies illustrate the struggles they face to be creative and
also show the significant advantages of digital technologies in assisting such artists. An investigation into people’s ability
to use the volume of their voice to control cursor movement to create drawings on the screen is also reported. With motivation,
training and practise, use of volume to control drawing tasks shows great promise. It is believed that paralinguistic voice
has wider implications beyond assisting artists with upper limb disabilities, such as: an alternative mode of interaction
for disabled people to perform tasks other than creating visual art, alternative mode of interaction for hands busy environments
and as a voice training system for people with speech impairments. 相似文献
9.
In the reinforcement learning system, the agent obtains a positive reward, such as 1, when it achieves its goal. Positive
rewards are propagated around the goal area, and the agent gradually succeeds in reaching its goal. If you want to avoid certain
situations, such as dangerous places or poison, you might want to give a negative reward to the agent. However, in conventional
Q-learning, negative rewards are not propagated in more than one state. In this article, we propose a new way to propagate
negative rewards. This is a very simple and efficient technique for Q-learning. Finally, we show the results of computer simulations
and the effectiveness of the proposed method. 相似文献
10.
Previous research has identified user concerns about biometric authentication technology, but most of this research has been
conducted in European contexts. There is a lack of research that has investigated attitudes towards biometric technology in
other cultures. To address this issue, data from India, South Africa and the United Kingdom were collected and compared. Cross-cultural
attitudinal differences were seen, with Indian respondents viewing biometrics most positively while respondents from the United
Kingdom were the least likely to have a positive opinion about biometrics. Multiple barriers to the acceptance of biometric
technology were identified with data security and health and safety fears having the greatest overall impact on respondents’
attitudes towards biometrics. The results of this investigation are discussed with reference to Hofstede’s cultural dimensions
and theories of technology acceptance. It is argued that contextual issues specific to each country provide a better explanation
of the results than existing theories based on Hofstede’s model. We conclude that cultural differences have an impact on the
way biometric systems will be used and argue that these factors should be taken into account during the design and implementation
of biometric systems. 相似文献