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   8290篇
  免费   143篇
管理学   1174篇
民族学   33篇
人才学   1篇
人口学   745篇
丛书文集   33篇
理论方法论   744篇
综合类   285篇
社会学   3565篇
统计学   1853篇
  2021年   57篇
  2020年   92篇
  2019年   139篇
  2018年   178篇
  2017年   251篇
  2016年   209篇
  2015年   155篇
  2014年   181篇
  2013年   1429篇
  2012年   312篇
  2011年   222篇
  2010年   181篇
  2009年   163篇
  2008年   203篇
  2007年   186篇
  2006年   146篇
  2005年   202篇
  2004年   187篇
  2003年   220篇
  2002年   250篇
  2001年   223篇
  2000年   199篇
  1999年   193篇
  1998年   146篇
  1997年   119篇
  1996年   132篇
  1995年   115篇
  1994年   102篇
  1993年   108篇
  1992年   129篇
  1991年   121篇
  1990年   115篇
  1989年   110篇
  1988年   114篇
  1987年   113篇
  1986年   113篇
  1985年   126篇
  1984年   104篇
  1983年   111篇
  1982年   77篇
  1981年   82篇
  1980年   73篇
  1979年   77篇
  1978年   79篇
  1977年   60篇
  1976年   50篇
  1975年   63篇
  1974年   49篇
  1973年   42篇
  1972年   41篇
排序方式: 共有8433条查询结果,搜索用时 15 毫秒
101.
"After a brief discussion of related studies of Thai youths' attitudes toward sexual activity, data from a 1988 national survey of young males (ages 15-24) about their family planning knowledge, attitudes, and practices are used to document the age pattern of sexual initiation, the prevalence of youths' encounters with commercial sex workers, the prevalence of their experience with non-commercial partners...and the degree to which the two patterns--commercial and noncommercial--are 'networked' because young men engage in both types of sexual activity. Finally, background characteristics of male youths that are associated with these patterns of sexual activity are examined."  相似文献   
102.
There is a serious misconception on the part of the public as well as amongst a great number of professionals to equate the problem of flatfoot with excessively pronated feet in growing children. This is a matter of grave concern since flatness of the arch of the foot can be a normal or abnormal finding in foot posture, whereas the excessively pronated foot is flattened as part of a pathological structural malposition. This inherent biomechanical defect is commonly present in the great majority of human children and is the basic reason for most postural pathology of the lower extremity.Excessive pronation of the feet in children should in no way be interpreted as a normal condition to be automatically outgrown. As a matter of fact, Whitman, the famous Orthopaedic Surgeon, noted in 1917 in his text Orthopaedic Surgery that pronation of the feet commonly seen in children is more likely to worsen than improve over the years. This paper presents the probable cause of the condition, treatment and prevention of the problem and recommendations for the future.The deforming foot posture known as excessive pronation is familiar to Podiatric Medicine and to Medicine generally. Yet, in spite of this familiarity, only an insignificant number of the millions of children in our country receive the simple available help required to minimize the problem.The Podiatric profession has within its grasp the wherewithal to correct this situation, through education and counseling of parents, through cooperation with pediatricians and other professionals and by utilizing technological advances in children's footgear and orthotics. It is the intention of this paper to provide an overview of the literature and history associated with the problem of excessive pronation in children, as well as to suggest some simple techniques for improving this situation.Dr. Tax is an international renowned consultant to many Podiatric Hospital amon which is the Veterans Administration in New Jersey, New York College of Podiatric Medicine, Ohio College of Podiatric Medicine. He has written and lectured extensively on the subject of children and problems with their feet.  相似文献   
103.
Starting in the early 1960s, the federal government joined with the private-sector housing developers in a partnership: in return for subsidized mortgages and tax benefits, developers would rent to low- and moderate-income tenants. Today, many elderly people live in these "publicly subsidized" units. The initial agreement, however, held out an escape clause: after 15 to 20 years, for-profit developers that wanted to end the partnership could prepay their mortgages, leaving tenants in those buildings "at risk" of rent increases and/or evictions. This article discusses that partnership, its options for dissolution, and the current solutions to the problem of the expiring agreements, including a moratorium, vouchers, and incentives. The compromise legislation responds to all interested parties--owners, current and would-be tenants, local governments, tax-payers--through a multi-stage sequence of dissolution, yet such a finely tuned, acutely sensitive legislative solution may not work easily or efficiently.  相似文献   
104.
Little is known about why nonprofits accrue debt, how much they owe, and whether the funds they borrow are used productively. This article distinguishes between productive, problematic, and deferred debt. Employing a data base representative of 114,726 tax-filing charitable nonprofits in the United States in 1986, it examines the pervasiveness of nonprofit debt and the relation between this debt and nonprofit financial health. The analysis finds that over 70 percent of the nonprofits hold debt, the distribution of this debt is highly concentrated, and the level of debt and leverage varies with asset size and type of activity. Nonprofits with higher leverage and absolute debt levels are financially healthier than those with lower levels. While the analysis does not determine whether financially stronger nonprofits are better able to borrow, the results support the view that borrowing in the nonprofit sector is economically efficient.  相似文献   
105.
106.
Using judgments obtained in interviews with 33 Massachusetts physicians, the annual statewide volume of expenditures incurred for defensive medical reasons in 1982 was estimated to be $1.0 billion, 12% of all medical care expenditures. Estimates for the nation were $37 billion, 14% of expenditures. Nationally, 180,000 cesarean deliveries were thought to be performed for defensive motives. In their own institutions, respondents judged 43% of all skull x-rays following injury to be medically justified, 30% to be defensive medicine, 16% to be placebos, and 11% to be physician misjudgments. In considering the economic and noneconomic costs of medical malpractice procedures, the dollar costs of insurance were considered most serious, followed closely by defensive medicine, unfairness, and poorer relations with patients. Thirty-two percent of the responsibility for the negative aspects of malpractice processes was assigned to lawyers, 21% to physicians, 18% to legislatures and courts, 16% to patients, and 13% to insurance companies.  相似文献   
107.
This paper examines 3 basic obstacles thwarting all attempts to reduce irregular migration. The 1st, rather well known and analyzed, underscores the dependency of all regulation of migratory flows on the system of economic and political relations between developed and developing countries. The 2nd obstacle resides in the persistance and growth of subsequent dependent irregular migration. This obstacle also reveals the relative autonomy of population movements compared with the employment situation in the labor market. The 3rd generally ignored obstacle is the role played by migration itself, particularly the discriminatory status of foreign workers in the labor market, in producing irregular migration.  相似文献   
108.
Premarital couples are among priority targets of family planning information in the Philippines national population program as they can serve a pivotal role in slowing population growth. Applicants for marriage licenses are required to attend a family planning session as a prerequisite. Following recommendations of a training effort and seminar on Premarital Family Planning Counseling, on July 20, 1976, premarital information was institutionalized in the country by Presidential DEcree 965 which made family planning counseling obligatory to the marriage license applicants. Shortly after that, a multiagency effort gathered information on the status of the Premarital information program in the Philippines, which showed that there is no full-time specialist for the work. Medical officers; social workers; community welfare supervisors; and program and training officers do this work of information in addition to their usual duties. Distribution of the applicants varied greatly in age groups, educational levels, and professional category. The size of the group, length of session and topics of discussion varied greatly. Necessary efforts should be made to solve the major problems by selecting better sites for group sessions and training more personnel for the purpose. There is a great need fordeveloping more effective and research oriented information, education and communication materials, according to the needs and cultural traits of the target audience.  相似文献   
109.
110.
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