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 15 毫秒
11.
Crocker Jennifer; Canevello Amy; Breines Juliana G.; Flynn Heather 《Canadian Metallurgical Quarterly》2010,98(6):1009
Two longitudinal studies examined the associations between interpersonal goals (i.e., self-image and compassionate goals) and anxiety and dysphoria (i.e., distress). In Study 1, 199 college freshmen (122 women, 77 men) completed 12 surveys over 12 weeks. Compassionate goals predicted decreased distress, and self-image goals predicted increased distress from pretest to posttest when distress was assessed as anxiety, dysphoria, or a composite, and when the goals were worded as approach goals, avoidance goals, or a composite. In Study 2, 115 first-semester roommate pairs (86 female and 29 male pairs) completed 12 surveys over 12 weeks. Compassionate and self-image goals predicted distress in same-week, lagged-week, and pretest-to-posttest analyses; effects of compassionate goals remained significant when the authors controlled for several known risk factors. Having clear goals consistently explained the association between compassionate goals but not self-image goals and distress. Results supported a path model in which compassionate goals predict increased support given to roommates, which predicts decreased distress. Results also supported a reciprocal association; chronic distress predicted decreased compassionate and increased self-image goals from pretest to posttest, and weekly distress predicted decreased compassionate goals the subsequent week. The results suggest that compassionate goals contribute to decreased distress because they provide meaning and increase support given to others. Distress, in turn, predicts change in goals, creating the potential for upward and downward spirals of goals and distress. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
12.
Understanding the influence of demographic and psychological variables on retirement planning. 总被引:1,自引:0,他引:1
The authors examined the degree to which workers were engaging in financial, health, interpersonal/leisure, and work planning for retirement, exploring whether demographic and psychological variables inhibited or promoted planning in each of these domains. Planning in each domain was influenced by a unique set of variables. Goals emerged as a consistent and positive predictor of planning. Gender accounted for health and interpersonal/leisure planning, while work planning behavior was negatively predicted by income. Time perspective also helped to clarify the amount of retirement planning undertaken in the financial and interpersonal/leisure domains. Practical implications for designing retirement interventions are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
13.
简述了基于性能抗震设计思想,判断塔楼超限情况,确定抗震性能目标,并通过对某塔楼进行小 震弹性分析、中震不屈服分析和弹性时程补充分析,对其结构抗震性能进行评估.最后,总结该塔楼基于性能抗震设计的经验,为同类工程设计提供参考. 相似文献
14.
总结"十二五"时期我国磷复肥行业的发展成就及存在的问题,介绍行业"十三五"时期面临的国际国内形势,面临的挑战和机遇。从规模、结构调整、产业转型升级、绿色可持续发展方面阐述"十三五"时期我国磷复肥行业的发展目标。重点介绍"十三五"时期我国磷复肥行业的发展方向和目标任务:加快产品结构调整,实现行业发展方式由"数量速度型"向"质量效益型"转变,调整原料结构;实施创新驱动发展战略;以现代农业发展为导向,加速生产、服务机制模式的转变;深入推进发展方式转变,强化节能减排,增强行业健康可持续发展的能力。提出实现"十三五"目标的政策建议。 相似文献
15.
Mexican American middle school students' goal intentions in mathematics and science: A test of social cognitive career theory. 总被引:1,自引:0,他引:1
Navarro Rachel L.; Flores Lisa Y.; Worthington Roger L. 《Canadian Metallurgical Quarterly》2007,54(3):320
This study examined whether sociocontextual and sociocognitive variables explained the math/science goals of 409 Mexican American youth using a modified version of R. W. Lent, S. D. Brown, and G. Hackett's (1994) social cognitive career theory. Results from structural equation modeling indicated that the hypothesized model explained a significant amount of variance in math/science goals for both Mexican American girls and boys. Findings suggested that gender did not moderate relations among the variables in the hypothesized model. Results also suggested that most of the social cognitive career theory propositions tested were supported. Specifically, social class predicted math/science past performance accomplishments. Math/science past performance accomplishments and perceived parent support predicted math/science self-efficacy. Furthermore, math/science self-efficacy predicted math/science outcome expectations, and together with math/science interests, these sociocognitive variables predicted math/science interests and goals. Contrary to expectations, generation status, Anglo orientation, and Mexican orientation did not predict math/science past performance accomplishments, and past performance accomplishments did not predict math/science outcome expectations. Furthermore, Anglo orientation and perceived social support from parents, teachers, classmates, and a close friend did not predict math/science goals. Suggestions for future research and implications of the results are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
16.
Vansteenkiste Maarten; Timmermans Tinneke; Lens Willy; Soenens Bart; Van den Broeck Anja 《Canadian Metallurgical Quarterly》2008,100(2):387
Previous work within self-determination theory has shown that experimentally framing a learning activity in terms of extrinsic rather than intrinsic goals results in poorer conceptual learning and performance, presumably because extrinsic goal framing detracts attention from the learning activity and is less directly satisfying of basic psychological needs. According to the match perspective, experimental extrinsic, compared to intrinsic, goal framing should enhance learning and performance for learners who personally hold a stronger extrinsic than intrinsic goal orientation, as these learners' personally held goals match with the situationally induced goals. An experimental field study among 5th-6th grade children shows that extrinsic goal framing resulted in poorer autonomous motivation, conceptual (but not rote) learning, and persistence compared to intrinsic goal framing, irrespective of participants' personal intrinsic versus extrinsic goal orientations and their spontaneous perception of the learning activity as serving an intrinsic or an extrinsic goal. The authors conclude that teachers can best promote intrinsic goals, even when facing students who personally hold a stronger extrinsic than intrinsic goal orientation. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
17.
Psychology, Public Policy, and Law focuses on the links between psychology as a science, relevant information derived from related disciplines as sciences, and public policy and law. It will publish articles that (1) critically evaluate the actual and potential contributions of psychology to public policy and legal issues, (2) assess the desirability of different public policy and legal alternatives in light of the scientific knowledge base in psychology, (3) articulate research needs that address public policy and legal issues for which there is currently insufficient theoretical and empirical knowledge, and (4) examine public policy and legal issues relating to the conduct of psychology and of related disciplines where relevant to psychology. The goals for the journal are to (1) provide a multidisciplinary forum for scholarship and interchange relevant to the mission of the journal, (2) provide a forum for the publications of comprehensive, scholarly articles that critically consider theoretical, conceptual, and doctrinal issues or that critically review the literature on topics relevant to the mission of the journal, and (3) provide a forum for the publication of comprehensive, scholarly articles that report the results of programs of research or large-scale empirical studies relevant to the mission of the journal. This particular issue provides a forum for critical discussion of the implications of using a social science amicus brief in court cases. It also demonstrates the opportunity that this journal will provide to social scientists to critically evaluate their colleagues' work when those colleagues attempt to offer their science and opinions in the legal or public policy arenas. Finally, this issue reflects the journal's desire to be a flexible forum for scholarly interchange. Rather than always publishing articles that are relatively independent of each other, the journal will also publish issues devoted to a single theme (as occurred in the first issue of this volume), and, as in the case of this issue, to interchange about one theme when it is appropriate for advancing the field. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
18.
Impett Emily A.; Gordon Amie M.; Kogan Aleksandr; Oveis Christopher; Gable Shelly L.; Keltner Dacher 《Canadian Metallurgical Quarterly》2010,99(6):948
In 2 daily experience studies and a laboratory study, the authors test predictions from approach-avoidance motivational theory to understand how dating couples can maintain feelings of relationship satisfaction in their daily lives and over the course of time. Approach goals were associated with increased relationship satisfaction on a daily basis and over time, particularly when both partners were high in approach goals. Avoidance goals were associated with decreases in relationship satisfaction over time, and people were particularly dissatisfied when they were involved with a partner with high avoidance goals. People high in approach goals and their partners were rated as relatively more satisfied and responsive to a partner's needs by outside observers in the lab, whereas people with high avoidance goals and their partners were rated as less satisfied and responsive. Positive emotions mediated the link between approach goals and daily satisfaction in both studies, and responsiveness to the partner's needs was an additional behavioral mechanism in Study 2. Implications of these findings for approach-avoidance motivational theory and for the maintenance of satisfying relationships over time are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
19.
Perceived partner responsiveness is a core feature of close, satisfying relationships. But how does responsiveness originate? Can people create relationships characterized by high responsiveness and, consequently, higher quality relationships? The authors suggest that goals contribute to cycles of responsiveness between two people, improving relationship quality for both of them. The present studies examine (a) how interpersonal goals initiate responsiveness processes in close relationships, (b) the self-perpetuating nature of these processes, and (c) how responsiveness evolves dynamically over time through both intrapersonal projection and reciprocal interpersonal relationship processes. In a semester-long study of 115 roommate dyads, actors' compassionate and self-image goals predicted a cycle of responsiveness between roommates, occurring within weeks and across the semester. In a 3-week study of 65 roommate dyads, actors' goals again predicted cycles of responsiveness between roommates, which then contributed to both actors' and partners' relationship quality. Results suggest that both projection and reciprocation of responsiveness associated with compassionate goals create upward spirals of responsiveness that ultimately enhance relationship quality for both people. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
20.
Two important forces in human behavior are action and inaction. Although action and inaction are commonly associated with the presence and the absence of behavioral activity, they can also be represented as information processing goals. Action (inaction) goals influence decision effort and increase satisfaction with environments that are structured to allow for more (less) processing (Studies 1 and 2). This increased satisfaction can transfer to the decision (Study 3) and can increase the intent to perform a decision-congruent behavior (Studies 4 and 6). Finally, the author shows escalation of action and inaction goals when they are not achieved (Study 5) and rebound of the alternative goal when the focal goal is achieved (Study 6). (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献