首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5745篇
  免费   227篇
  国内免费   2篇
  5974篇
  2020年   68篇
  2019年   81篇
  2018年   104篇
  2017年   109篇
  2016年   138篇
  2015年   89篇
  2014年   98篇
  2013年   596篇
  2012年   197篇
  2011年   195篇
  2010年   127篇
  2009年   125篇
  2008年   202篇
  2007年   181篇
  2006年   176篇
  2005年   167篇
  2004年   139篇
  2003年   170篇
  2002年   175篇
  2001年   105篇
  2000年   113篇
  1999年   91篇
  1998年   79篇
  1997年   74篇
  1996年   66篇
  1995年   53篇
  1994年   64篇
  1993年   78篇
  1992年   69篇
  1991年   101篇
  1990年   66篇
  1989年   62篇
  1988年   61篇
  1987年   69篇
  1986年   56篇
  1985年   71篇
  1984年   81篇
  1983年   63篇
  1982年   78篇
  1981年   86篇
  1980年   68篇
  1979年   70篇
  1978年   64篇
  1977年   73篇
  1976年   66篇
  1975年   83篇
  1974年   86篇
  1973年   78篇
  1972年   50篇
  1966年   53篇
排序方式: 共有5974条查询结果,搜索用时 0 毫秒
991.
This study examines the impact of the “Great Recession” (from December 2007 to June 2009) on 8th and 10th graders in the USA, using annual nationally representative data from the Monitoring the Future study. Historical changes in youth adjustment (self‐esteem, depressed mood, risk taking, aggression and property crime), school achievement (grade point average [GPA], time spent on homework and educational expectations) and structured and unstructured activities (volunteering, employment, sports and evenings out for fun) were examined between 1991 and 2014. Overall, there were only slight changes in mean levels of adjustment, achievement and most youth activities. However, the percentage of youth working during the school year did decline during the Great Recession. Several longer‐term trends were also evident, though not directly tied to the Great Recession. These include an increase in GPA, a decrease in time spent on homework, rising educational expectations and more time spent volunteering. Future work should assess how the shift to unpaid work activities (e.g. volunteering and internships) among youth is impacting the transition from school to work in the contemporary economy, and whether the Great Recession had deleterious impacts for younger children or among youth whose parents lost work or had their homes foreclosed.  相似文献   
992.
This article describes the changes in the religious landscape in Africa – on both the Christian and the Muslim sides – using the example of Cameroon, with the objective of determining the eventual implications that these changes can have for social peace in Africa. The country has seen a shift from planned and controlled evangelization and Islamization carried out by recognized political and religious authorities, to evangelization and Islamization done by individuals who, even though they represent religious currents recognized around the world, act autonomously. The religious landscape has consequently changed fundamentally on the geographical level: moving from the usual cleavage between the Christian South and the Muslim North to a total breakdown in ethno‐regional religious territories. The same thing can be observed for various Christian denominations, which are no longer confined to their historic ethno‐regional territories. Religious organizations are now set up in an anarchic manner. All of this is taking place in a fragile local and regional environment which could, as argued here, present a genuine threat to social peace in Cameroon.  相似文献   
993.
Differential reinforcement procedures may promote unprompted correct responding, resulting in a quicker transfer of stimulus control than nondifferential reinforcement. Recent studies that have compared reinforcement arrangements have found that the most effective arrangement may differ across participants. The current study conducted an assessment of differential reinforcement arrangements (i.e., quality, schedule, and magnitude) and nondifferential reinforcement to identify the most effective arrangement for each participant. The assessment phase showed that the quality arrangement was the most efficient for all participants during auditory‐visual matching. Next, a validation phase was conducted to evaluate whether the assessment would predict the most effective arrangement across multiple skills. The results from the assessment phase were validated for all participants for the same skill. However, the results were only validated for one participant during the other skills (i.e., tact and intraverbal). The results are discussed in light of previous research and future areas of research.  相似文献   
994.
Re-membrance     
Traced sufficiently remotely, all people, profanum vulgus, share a common familial and linguistic heritage. Several Occidental and Oriental religiophilosophical traditions and General Systems (neuro-linguistic/neuro-semantic) Theory propound that resolution of personal illness and intra- and inter-generational psychological conflicts among individuals and within society mandates a figurative, if not a literal return, to the source of conflict or contention—to RE-MEMBER with that source—if healing, peace, resolution, concord, solace, sustenance, and wholeness are to be achieved. Words that communicate effectively, linguistic symbols such as water and the cross, and the action of laying-on-of-hands are methodologies that reaffirm a personal commonality among all traditions and facilitate RE-MEMBRANCE. For those who adhere to the Judeo-Christocentric tradition—who are called and chosen to witness and serve through the sacrament of baptism—healing, support, and sustenance are achieved by RE-MEMBRANCE through the Triune God.  相似文献   
995.
Internationally adopted (IA) children have often experienced early adversity and are at risk for long‐term deficiencies in multiple developmental domains. This study examined the association between IA children's joint attention (JA) soon after arrival and later cognitive, communicative, and socioemotional competency 6 months’ postadoption. We expected a child's initial JA would positively predict later cognitive, communication, and social ability. IA children (n = 63) adopted from Eastern Europe were seen soon after their arrival into the United States to assess their JA. Their socioemotional competency, social communication, and cognitive abilities were measured at a follow‐up session 6 months’ postadoption. We found that higher order JA was positively associated with measures of social relatedness. Furthermore, individual hierarchical regressions of each measure of JA (higher order JA, initiating JA, responding to JA, and initiating behavior requests [BR]) considered with age‐at‐adoption showed that each measure was an independent and positive predictor of Mullen outcomes in the receptive and expressive language domains. These results suggest that JA may be a sensitive predictor of subsequent functioning in the social, communicative, and cognitive domains. Thus, assessing JA soon after arrival has the potential to identify at‐risk IA children, and interventions targeting JA may support those children in overcoming the negative impacts of early adversity.  相似文献   
996.
We investigated whether lines and shapes that present face-like features would be associated with emotions. In Experiment 1, participants associated concave, convex, or straight lines with the words happy or sad. Participants found it easiest to associate the concave line with happy and the convex line with sad. In Experiment 2, participants rated (valence, pleasantness, liking, and tension) and categorised (valence and emotion words) two convex and concave lines that were paired with six distinct pairs of eyes. The presence of eyes affected participants’ valence ratings and response latencies; more congruent eye–mouth matches produced more consistent ratings and faster reaction times. In Experiment 3, we examined whether dots that resembled eyes would be associated with emotional words. Participants found it easier to match certain sets of dots with specific emotions. These results suggest that facial gestures that are associated with specific emotions can be captured using relatively simple shapes and lines.  相似文献   
997.
In today’s competitive environment, salespeople are challenged with creating customer value in an ethical manner while meeting performance goals. Sales supervisors play a critical role in ensuring that this challenge is met. This research examines the roles of psychological ethical climate and leader–member exchange (LMX) in encouraging salespeople’s commitment to providing superior customer value, reducing their unethical intentions and improving sales performance. Results indicate that business-to-business salespeople’s psychological ethical climate perceptions influence their perceived relationship with their sales supervisor (i.e. LMX relationship) as well as their commitment to providing superior customer value. LMX also directly influences commitment to providing superior customer value, which in turn affects salespeople’s unethical intent and quota performance. Theoretical and managerial implications based on the study’s findings are provided, as well as directions for future research.  相似文献   
998.
This investigation focused on elementary-aged (first and fourth grade) children's individual preferences for narrative and expository text and perceptions of what their same-aged peers would like to read. Preferences and perceptions of text were examined through the lenses of social constructivist and engaged reading theories. The overall purpose of this study was to examine elementary students' preferences for and perceptions about narrative and expository text. This study was a systematic replication and extension of Chapman, Filipenko, McTavish, and Shapiro's (2007) research in British Columbia with first graders. Two individually administered book preference (Open and Closed) tasks and interviews were administered to 84 students. Findings revealed gender and grade level profiles in terms of preferences, perceptions, and rationales for their book choices. As expected, both first and fourth grade boys demonstrated a strong preference for expository text, however, the fourth grade boys also showed a growing preference for narrative text as well. In contrast, both first and fourth grade girls demonstrated a strong preference for both narrative and expository text. For both boys and girls, book topic and pictures/illustrations were the two top categories that drew the children's interest and resulted in the most conversations. Results are discussed in light of implications for instruction, assessment, and future research.  相似文献   
999.
To better understand the multiple individual factors that contribute to college cheating, we undertook a multivariate analysis of a national sample of 2,503 college students. Our findings indicated that demographic characteristics (e.g., gender, socioeconomic status, and year in college), character qualities (e.g., lack of self-control, others-oriented life purpose), college experience (e.g., academic preparation, extracurricular activities involvement, and working), and student perceptions and attitudes (e.g., attitude toward academic cheating, perception of faculty’s actions against cheating and cheating environment) are all significantly associated with academic cheating.  相似文献   
1000.
This research examined attitudes toward condom purchase. Recent evidence is mixed. While some studies show attitudes have become more positive, other studies suggest that negative attitudes still dominate. Our own research examined the possibility that such attitudes may be ambivalent, meaning that the same individuals may simultaneously hold both positive and negative beliefs about condom purchase. The results confirmed this prediction. Study 1 showed that condom purchase evoked a combination of both negative beliefs about lifestyles and positive beliefs concerning the personal confidence of the consumer. These beliefs had competing effects on more global attitudes toward condom purchase. Specific beliefs about condoms were shown to provide the best indication of. whether participants actually used condoms. Study 2 employed standard measures of attitudinal ambivalence. The results conceptually replicated the finding that ambivalence was greater for those who purchased condoms compared to controls.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号