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   62178篇
  免费   2565篇
  国内免费   20篇
  64763篇
  2020年   613篇
  2019年   825篇
  2018年   1126篇
  2017年   1153篇
  2016年   1220篇
  2015年   883篇
  2014年   1035篇
  2013年   4661篇
  2012年   1938篇
  2011年   2094篇
  2010年   1277篇
  2009年   1278篇
  2008年   1858篇
  2007年   1871篇
  2006年   1672篇
  2005年   1481篇
  2004年   1376篇
  2003年   1305篇
  2002年   1396篇
  2001年   1996篇
  2000年   1976篇
  1999年   1500篇
  1998年   723篇
  1997年   641篇
  1996年   631篇
  1993年   568篇
  1992年   1246篇
  1991年   1143篇
  1990年   1127篇
  1989年   1033篇
  1988年   1012篇
  1987年   968篇
  1986年   1041篇
  1985年   1053篇
  1984年   883篇
  1983年   801篇
  1982年   564篇
  1981年   565篇
  1979年   938篇
  1978年   669篇
  1975年   763篇
  1974年   817篇
  1973年   908篇
  1972年   768篇
  1971年   723篇
  1970年   645篇
  1969年   670篇
  1968年   856篇
  1967年   776篇
  1966年   653篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
T J Silber 《Adolescence》1984,19(74):493-499
The period of youth and adolescence has been shown to have continuous demographic growth in the developing world. Young nations thus have to contend with the specific health needs of teenagers and young adults. This is illustrated by an analysis of the health-care needs of Brazilian adolescents. The issues highlighted here are adolescent morbidity and mortality, current delivery of adolescent health care, and future directions of adolescent programs in Brazil.  相似文献   
992.
This study provides a reexamination of the role of different decisional strategies in facilitating progress in occupational decision making. Although the assumptions that a rational decision making style is the preferred mode of vocational functioning has been endorsed in a variety of career theories and interventions, there has been conflicting evidence about the validity of this assumption. To examine the role of different decisional approaches in the progress of making an occupational decision, the rational, intuitive, and dependent decision making style scores of 71 undergraduate students were used to predict progress in occupational decision making. The results of the regression analyses failed to provide support for the assumption that a rational style is the most effective in accomplishing this careerrelated task, but indicated strong support for the conclusion that the use of dependent decisional strategies is damaging, particularly in early stages of the decisional process.  相似文献   
993.
Though many studies have examined the predictive power of expressed choices versus that of measured interests, fewer have been concerned with the relationship between the degree to which choices and interests agree and later persistence in an expressed choice. This study explored that relationship, using longitudinal data for 7706 college students and 1372 employed persons. Four levels of congruence between expressed choice and measured interests were identified. Results indicated that persistence in an expressed choice increases systematically as congruence between choice and interests increases. Implications for counselors are noted.  相似文献   
994.
This study tested aspects of Super's self-concept theory of career development with a sample of British schoolchildren. Findings suggested that self-concepts and concepts of occupational preferences do have a role in career development, though there were some indications that the theory is more applicable to more able youngsters and to those high in self-esteem, than to others. Agreement between ideal-self-concepts and occupational preference concepts was significantly greater than that between actual-self-concepts and occupational preference concepts. This finding was interpreted as reflecting the youngsters' greater concern for the future and the possible, rather than the present and the given, and it suggested that refinements are needed in Super's theory.  相似文献   
995.
The authors recently proposed that adverse effects of material rewards on Wechsler subscale performance may be the result of a reward-produced developmental regression. The present study further explores that idea through an attempt to replicate earlier findings with adults and to extend the inquiry to children. Selected Wechsler subscales were administered to 32 subjects at each of three ages (5, 10, and 18 years) under either reward or nonreward conditions. Subscales were chosen to represent both algorithmic and heuristic types of tasks. Reward and nonreward groups (8 males and 8 females per group at each age) were matched initially on age and ability. For adults, consistent with earlier findings, reward had an adverse effect on performance on the heuristic subscales and tended to facilitate performance on the algorithmic subscales. However, rewards generally had no effect at the fourth-grade level and had a reverse effect at the nursery school level, i.e., rewards facilitated heuristic and hampered algorithmic performance. These findings appear to be more consistent with an explanation based on developmental regression than on any available alternative mechanism.  相似文献   
996.
Full-time employed (N = 255), partly employed (N = 48), and unemployed (N = 43) male and female university graduates completed a questionnaire that included measures designed to assess expected job levels and current job levels and two measures of potential social action (willingness to volunteer actions and hours to a fictional Campaign to Assist Unemployed Youth). Comparisons between groups and the results of multiple regression analyses provided mixed support for the prediction that larger negative gaps between expected and current employment status would be associated with a greater willingness to assist the Campaign. The unemployed respondents tended to volunteer more actions and more hours to the Campaign than did the other two groups. A multiple regression analysis showed that the current level by expected level interaction term was statistically significant as predicted, but only for the fully employed graduates. Within the full-time employed group, female graduates and those from the humanities/social sciences/education schools expressed more willingness to assist the Campaign than did male graduates and those from the sciences/medicine schools of the university. Results were discussed in relation to current research on relative deprivation and reported affect and to recent studies of job satisfaction.  相似文献   
997.
A comparison of the WISC-R and the Woodcock-Johnson Psycho-Educational Educational Battery (W-J) was made for children with regular and learning-disabled (LD) class placement. The W-J and Wechsler Intelligence Scale for Children-Revised (WISC-R) evidence low to moderate correlations and significant mean differences, indicating that the two tests are measuring somewhat different abilities to somewhat differing degrees. W-J—WISC-R correlations for the regular students exceed those of the LD students in the greater majority of the cases. Rank ordering of the WISC-R subtests and the W-J clusters indicate, as might be expected, that the LD students fare the worst in the WISC-R academic subtests (Arithmetic, Information and Vocabulary) and in the W-J academic clusters. More research needs to be conducted with the W-J before it should be adopted for use in the placement of exceptional children.  相似文献   
998.
As an example of the development of an early school psychology program in the Southwest, the beginning of Child Study and Consultation Service is described. The unique aspect of this program undoubtedly had to do with its relationship to a demonstration mental health center and a consultation program started in several elementary school districts in the area. Beginning with a consortium of five school districts, it was later expanded to include 16 school districts with a staff of 15 doctoral-level school psychologists. This account also describes the author's involvement with the Division of School Psychology and some of the major issues facing the division in the late 1950s and 1960s. An attempt is made to show how the author's educational and work experiences contributed to the philosophy, policies, and practices of school psychology.  相似文献   
999.
Rats' lever pressing produced sucrose reinforcers on a variable-interval schedule where, in different conditions, the duration of a stimulus presented immediately after reinforcement was either correlated or uncorrelated with the duration of the current interreinforcement interval. Under the baseline schedule, in which no stimulus was presented, the minimum interreinforcement interval was 8 s and the mean postreinforcement pause of each subject approximated this value. Response rates increased slowly over the first 10 to 15 s and then remained roughly constant throughout the remainder of the interval. In both the correlated and uncorrelated conditions, the added stimulus resulted in the postreinforcement pauses lengthening to values in excess of the duration of the preceding stimulus. This resulted in a poststimulus pause which was, in most cases, roughly constant irrespective of the duration of the preceding stimulus, or of the reinforcement contingencies prevailing immediately after stimulus offset. Local response-rate patterns in the uncorrelated conditions were similar to those obtained under the baseline schedule in which no stimulus was presented. However, in the correlated condition local response rates increased across the remainder of the interreinforcer interval. Further, the rate of acceleration was inversely related to the duration of the preceding stimulus. These results show that a correlation between stimulus duration and the ensuing time to reinforcement can control behavior—a type of temporal control not previously reported.  相似文献   
1000.
This study investigated the intellectual functioning and personality characteristics of 81 Australian ex-servicemen, 42 of whom had served in Vietnam. A Cognitive Impairment Model (SCIM) developed by Savage (1978, 1981, 1984) enabled intellectual functioning levels, intellectual deterioration and learning ability in the verbal and performance modalities to be asses. The Clinical Analysis Questionnaire (CAQ) of Krug (1980) based 00 Cattell's theory and personality measurement techniques provided an assessment of normal personality characteristics and clinical factors. The data suggested that the two groups, Australian ex-servicemen and Australian Vietnam veterans, were relatively homogeneous with regard to cognitive functioning and gave no indication of impairment in their intellectual levels or of their learning ability. Significant personality differences were, however, found between the two groups of ex-servicemen. The Vietnam veterans showed significantly more tension, depression, guilt, resentment, alienation and hypochondriasis than their colleagues who had remained in Australia. They were more withdrawn from others and from reality and had more abnormal thought than the ex-servicemen who had not been to Vietnam. The cognitive data do not support the view that Vietnam veterans suffered from any serious cognitive impairment. The personality data, however, suggest a significant “Psycbological Stress Syndrome” in these Vietnam veterans which required professional psychological treatment.  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