全文获取类型
收费全文 | 10596篇 |
免费 | 235篇 |
国内免费 | 16篇 |
专业分类
10847篇 |
出版年
2012年 | 1216篇 |
2011年 | 1288篇 |
2010年 | 307篇 |
2009年 | 123篇 |
2008年 | 1029篇 |
2007年 | 1031篇 |
2006年 | 935篇 |
2005年 | 782篇 |
2004年 | 650篇 |
2003年 | 616篇 |
2002年 | 552篇 |
2001年 | 423篇 |
2000年 | 496篇 |
1999年 | 188篇 |
1998年 | 48篇 |
1997年 | 45篇 |
1996年 | 30篇 |
1995年 | 25篇 |
1994年 | 28篇 |
1993年 | 40篇 |
1992年 | 30篇 |
1991年 | 28篇 |
1990年 | 25篇 |
1989年 | 16篇 |
1988年 | 24篇 |
1987年 | 17篇 |
1986年 | 28篇 |
1985年 | 25篇 |
1984年 | 25篇 |
1983年 | 25篇 |
1982年 | 15篇 |
1981年 | 24篇 |
1980年 | 19篇 |
1979年 | 25篇 |
1978年 | 22篇 |
1977年 | 13篇 |
1974年 | 13篇 |
1963年 | 16篇 |
1959年 | 26篇 |
1958年 | 71篇 |
1957年 | 65篇 |
1956年 | 63篇 |
1955年 | 46篇 |
1954年 | 46篇 |
1953年 | 49篇 |
1952年 | 39篇 |
1951年 | 24篇 |
1950年 | 23篇 |
1949年 | 18篇 |
1948年 | 19篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
251.
This study examined relationships between distal social contexts, parents' support for learning, self-concept, and adolescents' academic goal orientations. Data were collected from 435 female and 410 male 18-yr.-old South Africans. Multistage regression analyses indicated that family social status and rural/urban locality had unmediated relations with the adolescents' learning and performance goal orientations. In addition, parent and self-concept measures combined to have small independent associations with the adolescents' academic goal orientations. 相似文献
252.
A survey of 71 graduates of the psychology residency program at The University of Texas Houston Medical School and the Texas Research Institute of Mental Science indicated that two-thirds of the respondents were involved in private practice, conducting primarily individual therapy, with assessment also playing a major role in their practice. Managed care had the effect of placing limits on the numbers of sessions available to patients, reducing income, and increasing paperwork associated with practice. Implications for training during residency are that individual therapy, using focused short-term approaches, and assessment should continue to be the primary clinical experiences for trainees, and that there should also be training in the business aspect of practice, including marketing. 相似文献
253.
Researchers frequently use data from monitoring tasks to argue that constraints on meaning facilitate lower-level processes. An alternate hypothesis is that the processing level that a monitoring task requires interacts with discourse-level processing. Subjects monitored spoken sentences for a synonym (semantic match), a nonsense word (phonological match), or a rhyme (phonologically and semantically constrained matching). The critical targets appeared at the beginning of the final clause in two-clause sentences that began with if, which signals a semantic analysis at the discourse level, or with though, which maintains a surface representation. Synonym-monitoring times were faster for if than for though, nonsense word-monitoring times were faster for though than for if, and rhyme-monitoring times did not differ for if and though. The results show that conjunctions influence how listeners allocate attention to semantic versus phonological information, implying that listeners form these kinds of information independently. 相似文献
254.
Previous experiments based on a masked-priming paradigm revealed robust morphological priming effects induced by two derivational morphemes in Hebrew: the root and the verbal pattern. However, considering the special characteristics of the masked-priming paradigm, the possible contributions of phonological and/or semantic factors to these morphological effects could not be firmly assessed. In the present study, the role of these factors in morphological priming was examined, using cross-modal presentation. Experiment 1 revealed that priming between morphologically related words in Hebrew is determined by higher level linguistic characteristics and cannot be reduced to phonological overlap. Experiment 2 confirmed that morphological priming occurs in Hebrew even when primes and targets are not semantically related but, nevertheless, increases with semantic similarity. The results support the claim that morphological priming cannot be accounted for by considering semantic and phonological factors alone, and they exemplify the potential of using both masked and cross-modal priming to examine morphological processing. 相似文献
255.
This study questions the evidence that a parity rule is used during the verification of multiplication. Previous studies reported that products are rejected faster when they violate the expected parity, which was attributed to the use of a rule (Krueger, 1986; Lemaire & Fayol, 1995). This experiment tested an alternative explanation of this effect: the familiarity hypothesis. Fifty subjects participated in a verification task with contrasting types of problems (even x even, odd x odd, mixed). Some aspects of our results constitute evidence against the use of the parity rule: False even answers were rejected slowly, even when the two operands were odd. We suggest that the odd-even effect in verification of multiplication could not be due to the use of the parity rule, but rather to a familiarity with even numbers (three quarters of products are indeed even). 相似文献
256.
257.
258.
An experiment on adaptive automation is described. Reliability of automated fault diagnosis, mode of fault management (manual vs. automated), and fault dynamics affect variables including root mean square error, avoidance of accidents and false shutdowns, subjective trust in the system, and operator self-confidence. Results are discussed in relation to levels of automation, models of trust and self-confidence, and theories of human-machine function allocation. Trust in automation but not self-confidence was strongly affected by automation reliability. Operators controlled a continuous process with difficulty only while performing fault management but could prevent unnecessary shutdowns. Final authority for decisions and action must be allocated to automation in time-critical situations. 相似文献
259.
Woodbury M 《Science and engineering ethics》2000,6(2):235-244
Business people repeatedly asked Computer Professionals for Social Responsibility (CPSR) to recommend a policy to deal with
email and voicemail. After many such requests to our organization, we attempted to construct guidelines that we could endorse.
This paper outlines the guidelines that we proposed and the public reaction to them. The paper discusses the tensions inherent
in a business environment, and the means of identifying ethical behavior for both companies and their employees.
A version of this paper was presented at ETHICOMP98, the Fourth International Conference on Ethical Issues of Information
Technology, March 25–27, 1998. Erasmus University, the Netherlands.
Dr. Woodbury is the former Chair of CPRS. Computer Professionals for Social Responsibility. She is also a curriculum developer
and faculty member of the Information Group of the Women’s International University (ifu) in Germany in 2000. 相似文献
260.