全文获取类型
收费全文 | 556篇 |
免费 | 16篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 12篇 |
综合类 | 31篇 |
化学工业 | 8篇 |
金属工艺 | 2篇 |
机械仪表 | 6篇 |
建筑科学 | 45篇 |
矿业工程 | 9篇 |
能源动力 | 10篇 |
轻工业 | 11篇 |
水利工程 | 9篇 |
石油天然气 | 2篇 |
武器工业 | 3篇 |
无线电 | 14篇 |
一般工业技术 | 17篇 |
冶金工业 | 320篇 |
原子能技术 | 6篇 |
自动化技术 | 75篇 |
出版年
2024年 | 4篇 |
2023年 | 18篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 5篇 |
2016年 | 4篇 |
2015年 | 7篇 |
2014年 | 18篇 |
2013年 | 19篇 |
2012年 | 13篇 |
2011年 | 47篇 |
2010年 | 47篇 |
2009年 | 37篇 |
2008年 | 40篇 |
2007年 | 39篇 |
2006年 | 36篇 |
2005年 | 36篇 |
2004年 | 34篇 |
2003年 | 40篇 |
2002年 | 29篇 |
2001年 | 25篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 5篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1964年 | 3篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1957年 | 2篇 |
1955年 | 1篇 |
排序方式: 共有580条查询结果,搜索用时 0 毫秒
571.
Two studies investigated the proposition that social achievement goals (different orientations toward social competence) are an important aspect of young adolescents' social motivation. Study 1 (N=153 6th-grade students) established that different orientations toward developing or demonstrating social competence can be seen in young adolescents' responses to open-ended questions about their social goals and social competence. Study 2 (N=217 6th-grade students) evaluated a new survey measure of social achievement goals for young adolescents. Exploratory factor analyses indicated a 3-factor model (social development, demonstration-approach, and demonstration-avoid goals). Different social achievement goals were associated with distinct patterns of subsequent self- and teacher-reported social adjustment (prosocial, aggressive, and anxious solitary behaviors, as well as social worry, best-friend quality, and perceived popularity). Effects for social achievement goals were independent of perceived social competence and gender. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
572.
Two factors increase the motivation to adhere to a goal: goal commitment and lack of goal progress. When people ask about commitment, focusing on what they have accomplished (to date) signals to them high commitment and increases motivation. Conversely, when commitment is certain and people ask about goal progress, focusing on what they have yet to accomplish (to go) signals to them lack of progress and increases motivation. Accordingly, 4 studies show that emphasizing to-date information increases goal adherence when commitment is uncertain--that is, when participants study for a relatively unimportant exam, consume luxuries, fulfill a desire, and make first-time contributions to a charity. Conversely, emphasizing to-go information increases goal adherence when commitment is certain--that is, when participants study for an important exam, consume necessities, fulfill a need, and make repeated contributions to a charity. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
573.
本文对芽用大豆品种的育种目标、芽用特性的遗传变异、性状改良与技术、后代选择方法、国内外芽用大豆育成品种概况等进行了综述,并展望大豆种质资源芽用特性的鉴定评价与利用、芽用特性的遗传规律研究、品质育种技术综合运用等研究方向的前景,为芽用大豆的品种选育提供文献参考。 相似文献
574.
隋涌 《北京印刷学院学报》2012,20(1):72-75
用户体验设计的概念来源于西方产品设计理论,目前广泛应用于互联网产品的设计。图形作为网站传递信息的重要媒介,也越来越强调用户需求的满足和用户体验的提升。本文从用户体验的概念入手,阐述网站图形设计的依据,并依据不同类型网站应强调的核心体验点将网站进行分类,探讨网站图形设计过程中的原则以及具体的设计方法。 相似文献
575.
为了高效地求解最优路由、Web Service及网格资源调度等多阶段、多目标优化组合问题,提出结合AHP(Analytic Hierarchy Process)方法和遗传算法的求解算法,可以高效地完成多阶段的优化组合以及合理地确定多目标中各目标权重,实验结果表明了算法的有效性。 相似文献
576.
运用艺术学、心理学等理论与方法分析了地图语言艺术化的本质与目标。认为地图语言艺术化的本质是要使地图语言成为公众易于接受和乐于接受的形式,全面体现人性化设计理念。地图语言艺术化的主要目标是使地图语言精巧化、审美化、形象化、情感化。 相似文献
577.
The popularity of coaching continues to grow at a rate faster than research can validate coaching practices. Although strong research and theory on coaching have been emerging over the past few years, we believe that this body of literature would benefit from more integration of theory and application of organizing frameworks. The current paper seeks to contribute to the coaching literature by applying a Control Theory (CT) framework to elements of executive coaching. The two core elements of CT—goals and feedback—are also critical components of executive coaching. By applying a CT framework, we hope to provide both structure and new ideas regarding the roles of goals and feedback in executive coaching. We also suggest that one role of executive coaches is to help coaches become more effective self-regulators and effectively engage in goal setting and feedback seeking, among other things, in order to facilitate development. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
578.
Diekman Amanda B.; Clark Emily K.; Johnston Amanda M.; Brown Elizabeth R.; Steinberg Mia 《Canadian Metallurgical Quarterly》2011,101(5):902
The goal congruity perspective posits that 2 distinct social cognitions predict attraction to science, technology, engineering, or mathematics (STEM) fields. First, individuals may particularly value communal goals (e.g., working with or helping others), due to either chronic individual differences or the salience of these goals in particular contexts. Second, individuals hold beliefs about the activities that facilitate or impede these goals, or goal affordance stereotypes. Women's tendency to endorse communal goals more highly than do men, along with consensual stereotypes that STEM careers impede communal goals, intersect to produce disinterest in STEM careers. We provide evidence for the foundational predictions that gender differences emerge primarily on communal rather than agentic goals (Studies 1a and 3) and that goal affordance stereotypes reflect beliefs that STEM careers are relatively dissociated from communal goals (Studies 1b and 1c). Most critically, we provide causal evidence that activated communal goals decrease interest in STEM fields (Study 2) and that the potential for a STEM career to afford communal goals elicits greater positivity (Study 3). These studies thus provide a novel demonstration that understanding communal goals and goal affordance stereotypes can lend insight into attitudes toward STEM pursuits. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
579.
围绕NB-IoT能源物联网安全构架及关键技术,分析了“双碳”目标下能源系统新特征,从绘制碳足迹、优化能源供给、优化能源交易和构建双向信息流四个方面剖析了能源物联网对“双碳”目标的支撑作用。总结了“双碳”目标下能源物联网的特性及需求,归纳了以NB-IoT 为代表的LPWAN与能源物联网的匹配关系。探索构建了包含NB-IoT物联网安全模组和安全服务平台的能源物联网安全构架。重点分析了基于eSIM+ESAM NB-IoT的物联网安全模组硬件、基于GlobalPlatform可信框架的NB-IoT物联网安全模组软件,以及基于区块链的物联网卡全链条安全管理关键技术。该技术可为能源生产、传输、存储、交易和消费领域提供安全、可信的LPWAN物联网解决方案,为构建清洁低碳、安全高效的能源体系提供可信数据支撑,助力“3060双碳目标”实现。 相似文献
580.
This paper examines the water and sanitation procedures taken in refugee camps to provide inclusive services, preserve the environment, and design out waste, based on empirical data collected using a questionnaire distributed in Iraq, Jordan, and Lebanon. Our study finds that refugees in Lebanon were the furthest left behind compared to refugees in Jordan and Iraq. Moreover, considering the culture of refugees, installing quality WASH services, and shifting from the traditional linear approach to the circular economy approach is an advantage in refugee camps that creates more resilience opportunities for refugees and their hosts. Without the concrete Partnership between governmental institutions, NGOs, and stakeholders, SDG6 and other related ones, including SDG3, SDG4 SDG5 and SDG8 will not be accomplished by 2030. 相似文献