全文获取类型
收费全文 | 2939篇 |
免费 | 226篇 |
国内免费 | 107篇 |
专业分类
电工技术 | 86篇 |
综合类 | 519篇 |
化学工业 | 186篇 |
金属工艺 | 31篇 |
机械仪表 | 165篇 |
建筑科学 | 352篇 |
矿业工程 | 49篇 |
能源动力 | 34篇 |
轻工业 | 116篇 |
水利工程 | 26篇 |
石油天然气 | 15篇 |
武器工业 | 11篇 |
无线电 | 289篇 |
一般工业技术 | 363篇 |
冶金工业 | 227篇 |
原子能技术 | 14篇 |
自动化技术 | 789篇 |
出版年
2024年 | 38篇 |
2023年 | 62篇 |
2022年 | 120篇 |
2021年 | 133篇 |
2020年 | 127篇 |
2019年 | 107篇 |
2018年 | 80篇 |
2017年 | 112篇 |
2016年 | 131篇 |
2015年 | 109篇 |
2014年 | 235篇 |
2013年 | 187篇 |
2012年 | 214篇 |
2011年 | 247篇 |
2010年 | 214篇 |
2009年 | 201篇 |
2008年 | 169篇 |
2007年 | 168篇 |
2006年 | 127篇 |
2005年 | 92篇 |
2004年 | 91篇 |
2003年 | 74篇 |
2002年 | 65篇 |
2001年 | 50篇 |
2000年 | 38篇 |
1999年 | 23篇 |
1998年 | 8篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1985年 | 2篇 |
1982年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1963年 | 5篇 |
1962年 | 1篇 |
1961年 | 3篇 |
1959年 | 3篇 |
1958年 | 2篇 |
1957年 | 2篇 |
1954年 | 1篇 |
排序方式: 共有3272条查询结果,搜索用时 15 毫秒
1.
2.
María D Torres Herminia Domínguez 《International Journal of Food Science & Technology》2020,55(6):2296-2304
Potato processing industry has a high degree of discarding, which currently has low added value being used primarily for animal feed. However, potato wastes offer a broad range of interesting components such as antioxidants, starch, protein or fibre with potential applications in the food and non-food industries. The recovery of these high valuable fractions using efficient multistage and multiproduct processes could be of great interest. This short review provides a general overview on the integral valorisation of potato wastes, offering an updated vision of the main residual parts generated during potato harvesting and processing, the high valuable obtained components focusing on the bioactive ones and the potential of the emerging extraction techniques over conventional ones. In addition, innovative applications are discussed to highlight the scientific and applied interest of these underutilised and undervalued fractions and to emphasise the integral valorisation of raw materials. 相似文献
3.
物理化学课程创新教学模式是以学生学习为中心,吐故纳新,优化精选,以新颖或变化的教学方式进行教学。调查表明创新教学模式受到绝大多数学生的肯定和认可,有效地调动学生的积极性,提高了学生对物理化学的学习和探究兴趣,学生提问问题的广度和难度发生显著变化。该教学模式能够逐步提升学生的创新意识和创新能力。 相似文献
4.
Business, not technology leaders should manage the change of Information Technology (IT) from a self-contained business support unit of the sixties to a distributed strategic business function of the nineties. Top management should recognize that a good business plan can only be developed and executed through the partnership between the business unit managers and the managers of the financial, the personnel, and the IT resource units. The technical problems associated with the management of IT may again be the easier part of the total management challenge. 相似文献
5.
The main purpose of the study reported here was to investigate the relative importance of complexity of syllable structure and task differences in measuring phonological awareness in low-literacy adults. This study is a replication of a study with children conducted by S. A. Stahl and B. A. Murray (1994). Results indicated that the complexity of syllable structure did indeed better describe the construct of phonological awareness in low-literacy adults. At the same time, the authors also found some differences in the pattern of literacy acquisition for their Spanish adults in comparison with child literacy acquisition in English. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
The State of the Art in Text Filtering 总被引:1,自引:0,他引:1
This paper develops a conceptual framework for text filtering practice and research, and reviews present practice in the field.
Text filtering is an information seeking process in which documents are selected from a dynamic text stream to satisfy a relatively
stable and specific information need. A model of the information seeking process is introduced and specialized to define text
filtering. The historical development of text filtering is then reviewed and case studies of recent work are used to highlight
important design characteristics of modern text filtering systems. User modeling techniques drawn from information retrieval,
recommender systems, machine learning and other fields are described. The paper concludes with observations on the present
state of the art and implications for future research on text filtering.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
7.
The authors examined whether participants can shift their criterion for recognition decisions in response to the probability that an item was previously studied. Participants in 3 experiments were given recognition tests in which the probability that an item was studied was correlated with its location during the test. Results from all 3 experiments indicated that participants' response criteria were sensitive to the probability that an item was previously studied and that shifts in criterion were robust. In addition, awareness of the bases for criterion shifts and feedback on performance were key factors contributing to the observed shifts in decision criteria. These data suggest that decision processes can operate in a dynamic fashion, shifting from item to item. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
8.
指出当今建筑业良好的市场给建筑师们提供了展示自己作品的广大空间 ,但其精品却为之甚少。为此 ,对建筑业存在的一些问题及制约建筑师出精品的主、客观因素进行了分析 ,指出建筑师应提高自身素质 ,树立精品意识 ,增强市场竞争能力 相似文献
9.
关于创新学习的几点思考 总被引:1,自引:0,他引:1
涂淑梅 《沈阳工程学院学报(自然科学版)》2003,5(2):74-75
介绍了创新学习的内涵,分析了创新学习中的误区,提出了创新学习的方法。 相似文献
10.
No authorship indicated 《Canadian Metallurgical Quarterly》2004,59(8):787
Provides the biography of Cortney S. Warren and announces that she has received the APA Psi Chi/APA Edwin B. Newman Graduate Research Award (2004) for an outstanding research paper whose findings examine the potential for ethnicity to protect against body image disturbance by moderating the relationships between awareness and internalization of a thin physical ideal and body dissatisfaction. A selected bibliography is also provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献