全文获取类型
收费全文 | 14530篇 |
免费 | 1433篇 |
国内免费 | 892篇 |
专业分类
电工技术 | 1507篇 |
技术理论 | 7篇 |
综合类 | 1560篇 |
化学工业 | 883篇 |
金属工艺 | 249篇 |
机械仪表 | 1211篇 |
建筑科学 | 1605篇 |
矿业工程 | 427篇 |
能源动力 | 499篇 |
轻工业 | 326篇 |
水利工程 | 285篇 |
石油天然气 | 433篇 |
武器工业 | 132篇 |
无线电 | 1828篇 |
一般工业技术 | 1339篇 |
冶金工业 | 477篇 |
原子能技术 | 57篇 |
自动化技术 | 4030篇 |
出版年
2024年 | 62篇 |
2023年 | 181篇 |
2022年 | 342篇 |
2021年 | 445篇 |
2020年 | 438篇 |
2019年 | 333篇 |
2018年 | 300篇 |
2017年 | 373篇 |
2016年 | 438篇 |
2015年 | 583篇 |
2014年 | 1050篇 |
2013年 | 876篇 |
2012年 | 1090篇 |
2011年 | 1286篇 |
2010年 | 1020篇 |
2009年 | 894篇 |
2008年 | 922篇 |
2007年 | 987篇 |
2006年 | 922篇 |
2005年 | 802篇 |
2004年 | 708篇 |
2003年 | 563篇 |
2002年 | 400篇 |
2001年 | 410篇 |
2000年 | 303篇 |
1999年 | 243篇 |
1998年 | 179篇 |
1997年 | 153篇 |
1996年 | 114篇 |
1995年 | 97篇 |
1994年 | 64篇 |
1993年 | 64篇 |
1992年 | 45篇 |
1991年 | 32篇 |
1990年 | 27篇 |
1989年 | 19篇 |
1988年 | 25篇 |
1987年 | 7篇 |
1986年 | 10篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1975年 | 2篇 |
1964年 | 3篇 |
1957年 | 1篇 |
1956年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
The Iowa Flood Information System (IFIS) is a web-based platform developed at the Iowa Flood Center (IFC) in order to provide access to flood inundation maps, real-time flood conditions, flood forecasts, flood-related data, information, applications, and interactive visualizations for communities in Iowa. The IFIS provides community-centric watershed and river characteristics, rainfall conditions, and stream-flow data and visualization tools. Interactive interfaces allow access to inundation maps for different stage and return period values as well as to flooding scenarios with contributions from multiple rivers. Real-time and historical data of water levels, gauge heights, hourly and seasonal flood forecasts, and rainfall conditions are made available by integrating data from NEXRAD radars, IFC stream sensors, and USGS and National Weather Service (NWS) stream gauges. The IFIS provides customized flood-related data, information, and visualization for over 1000 communities in Iowa. To help reduce the damage from floods, the IFIS helps communities make better-informed decisions about the occurrence of floods and alerts communities in advance using NWS and IFC forecasts. The integrated and modular design and structure of the IFIS allows easy adaptation of the system in other regional and scientific domains. This paper provides an overview of the design and capabilities of the IFIS that was developed as a platform to provide one-stop access to flood-related information. 相似文献
992.
本文简介了多种现场网络与光纤网络互联的关键设备:PVC多媒体联网平台(多媒体用户接口)、光线路终端及光网络用户单元,评述了它们在小区的应用。 相似文献
993.
The Cognitive-Behavioral Relationship Record is a technique designed to help individual psychotherapy clients make sense of chronic relationship problems and to encourage them to experiment with new behavioral solutions. In this paper, the reader is given step-by-step instructions on how to use the Relationship Record accompanied by case illustrations. By conceptualizing relationships in terms of the interplay between two individuals’ cognitions and behaviors, the Relationship Record gives therapists a new tool to address the circular causality in relationship systems. In addition to its usefulness as a therapeutic technique, it may be seen as a step toward the integration of family systems into cognitive–behavioral therapy, or, more specifically, the assimilation of strategic therapy techniques and concepts into Aaron T. Beck’s school of cognitive therapy. The Relationship Record joins a movement in psychotherapy integration to enhance individual-based therapies by assimilating interpersonal approaches. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
994.
矿区整合通常会涉及到跨带的整合,在这过程中由于高程归化和高斯投影变形使改正后的长度与实际距离不等,给地质勘探施工放样带来不便。通过详细介绍露天矿整合独立坐标系的建立方法,较好解决了长度变形影响地质勘探施工产生的问题,给矿区整合提供便利。 相似文献
995.
摘 要 加快推进城乡一体化是破解“三农”问题、构建和谐社会的重大举措。该文通过对龙口市推进城 乡一体化进程的总体思路、取得的效果、存在的问题进行分析,提出发展经济、农村社区化建设、深化改 革3项推进城乡一体化进程的相关建议。 相似文献
996.
Lie‐Chien Lin Tzu‐Su Li Judy P. Kiang 《Quality and Reliability Engineering International》2009,25(5):551-569
During the recent years, the major driving forces of customer preference, vehicle safety, environmental protection, and flat demand for new cars led to a proliferation of car models and associated price reduction in the auto supply chain. To react to the complex and competitive environment, auto suppliers are urgent to conduct continual improvement (CI) in an effective and systematic way. Thus, this paper presents a framework for CI. The Integrated Development System is proposed to integrate both capability maturity model integration and six‐sigma approach. By implementing the framework, an automaker can establish a solid process‐based management system, identify critical processes, and optimize these processes. For demonstrating the application of this framework, a case study is presented and the result shows that all expected processes' performance targets are achieved, which has dramatically improved by 70% compared with the past records. Apparently, the proposed framework would act as a useful reference to improve an organization's process maturity. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
997.
Sinico Michele; Parovel Giulia; Casco Clara; Anstis Stuart 《Canadian Metallurgical Quarterly》2009,35(4):948
We show that human observers strongly underestimate a linear or circular trajectory that a luminous spot follows in the dark. At slow speeds, observers are relatively accurate, but, as the speed increases, the size of the path is progressively underestimated, by up to 35%. The underestimation imposes little memory load and does not require tracking of the trajectory. Most importantly, we found that underestimation occurred only when successive motion vectors changed in direction. This suggests a perceptual rather than representational origin of the illusion, related to vector-sum integration over time of neural motion signals in different directions. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
998.
史志贵 《湖南工业职业技术学院学报》2010,10(4):111-112
产学一体化是高职院校人才培养的重要途径,商贸类不同专业可从多种模式中选择适合自己的进行实践,并对教育教学方式进行系统改革、创新。 相似文献
999.
Caspar Franz; Silberschatz George; Goldfried Marvin; Watson Jeanne C. 《Canadian Metallurgical Quarterly》2010,20(1):101
In this article, each author gives a brief comment on similarities he or she sees throughout the case formulations captured in the articles by Watson (2010a), Silberschatz (2010), Goldfried (2010), and Caspar (2010). A systematic comparison is added. Overall, the impression is confirmed and maintained that if authors are ready to renounce the use of the jargon of their specific approach, many similarities can be found. There are nevertheless differences that would lead us to expect a different course of therapy and different effects beyond the main effect of recovery in the case of David, pursuing the conceptualization and interventions proposed by Watson (2010b). (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
1000.
Cognitive therapy and experiential dynamic therapy show quite many similarities but they diverge in their initial approach to the patient (aiming respectively at cognitions and at emotions) and in their assumptions about core pathogenetic processes. According to cognitive therapy patients suffer because of a negative unrealistic inner representation of self and world, whereas for experiential dynamic therapy problems arise from conflictual experience and expression of healthy feelings and needs. A synthetic model of the pathogenetic core process, embracing both a conflict about healthy needs and emotions, and a negative self-image, is outlined and discussed. In particular, the model's congruence with new knowledge emerging from infant and attachment research, emotion theory, and cognitive neurosciences is illustrated. Assuming an identity of their basic pathogenetic theory, the two therapies can be thought of as two initially different approaches, the one focusing more on cognitions, the other on emotions, but converging toward the change of a common pathogenetic core. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献