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   7860篇
  免费   202篇
管理学   1127篇
民族学   32篇
人才学   1篇
人口学   730篇
丛书文集   37篇
理论方法论   698篇
综合类   283篇
社会学   3350篇
统计学   1804篇
  2021年   52篇
  2020年   90篇
  2019年   129篇
  2018年   167篇
  2017年   244篇
  2016年   199篇
  2015年   149篇
  2014年   176篇
  2013年   1362篇
  2012年   296篇
  2011年   217篇
  2010年   176篇
  2009年   158篇
  2008年   192篇
  2007年   181篇
  2006年   138篇
  2005年   197篇
  2004年   174篇
  2003年   214篇
  2002年   231篇
  2001年   218篇
  2000年   192篇
  1999年   185篇
  1998年   143篇
  1997年   112篇
  1996年   127篇
  1995年   105篇
  1994年   97篇
  1993年   105篇
  1992年   125篇
  1991年   115篇
  1990年   112篇
  1989年   102篇
  1988年   111篇
  1987年   110篇
  1986年   104篇
  1985年   122篇
  1984年   98篇
  1983年   107篇
  1982年   75篇
  1981年   74篇
  1980年   69篇
  1979年   76篇
  1978年   77篇
  1977年   54篇
  1976年   46篇
  1975年   59篇
  1974年   48篇
  1973年   42篇
  1972年   39篇
排序方式: 共有8062条查询结果,搜索用时 15 毫秒
151.
This Issue Brief provides summary data on the insured and uninsured populations in the nation and in each state. It discusses the characteristics most closely related to individuals' health insurance status. Based on EBRI analysis of the March 1997 Current Population Survey, it represents 1996 data--the most recent data available. In 1996, 82.3 percent of nonelderly (under age 65) Americans had private or public health insurance. Seventy-one percent had private insurance, 64 percent through an employment-based plan. Sixteen percent had public health insurance. The percentage of uninsured Americans has been increasing since at least 1987. In 1987, 14.8 percent of the nonelderly population was uninsured, compared with 17.7 percent in 1996. However, the erosion of employment-based health benefits cannot fully explain this increase since 1993. Instead, the decline in public sources of health insurance would partly explain it. It may be that, while the percentage of individuals with employment-based coverage is rising, individuals previously covered by Medicaid and CHAMPUS/CHAMPVA are not being fully absorbed into the employment-based health insurance market. Between 1995 and 1996, the percentage of nonelderly Americans without health insurance coverage increased from 17.4 percent to 17.7 percent. Further examination indicates that children completely accounted for this increase. In 1995, 13.8 percent of children and 19 percent of persons ages 18-64 were uninsured, compared with 14.8 percent of children and 18.9 percent of persons ages 18-64 in 1996. With the recent passage of legislation designed to reduce the number of uninsured children, the next focal point for health care reform could be early retirees and unemployed persons. President Clinton and some members of Congress have expressed an interest in improving access to and affordability of coverage for these groups. Currently, health care cost inflation is at its lowest point in years, but there are signals indicating that it is about to rise above current levels. The federal government's recent announcement that health insurance premiums will rise for federal employees an average of 8.5 percent in 1998 may portend higher future health care costs. Similarly, disappointing earnings announcements from several large insurers because of higher medical costs and lower-than-expected revenues may indicate that health insurance plans will increase premiums. Employment and income play a dominant role in determining an individual's likelihood of having health insurance. Age, gender, firm size, work hours, and industry are also important determinants; however, these variables are also closely linked to employment status and income. Some of the widest variations involve factors that are not always looked at in traditional demographic assessments, such as citizenship. However, variations by race, ethnicity, and citizenship are also closely linked to employment status and income.  相似文献   
152.
This Issue Brief examines why policymakers are concerned about the trend toward early retirement and how it relates to Social Security, Medicare, and employee health and retirement benefits. It reviews the rationale for the effects of economic incentives on early retirement decisions and includes a summary of empirical literature on the retirement process. It presents data on how employee benefits influence workers' expected retirement patterns. Finally, it examines the implications of public policies to reverse early-retirement trends and raise the eligibility age for Social Security and Medicare. An employee Benefit Research Institute/Gallup survey indicates that there is a direct link between a worker's decision to retire early and the availability of retiree health benefits. In 1993, 61 percent of workers reported that they would not retire before becoming eligible for Medicare if their employer did not provide retiree health benefits. Participation in a pension plan can be an important determinant of retirement. Twenty-one percent of pension plan participants planned to stop working before age 65, compared with 12 percent among nonparticipants. Workers whose primary pension plan was a defined benefit plan were more likely to expect to stop working before age 65 (23 percent) than workers whose primary plan was a defined contribution plan (18 percent). Expected income replacement rates effect retirement patterns, indicating that as the expected replacement increases, the probability of expecting to stop working before age 65 increases. Twenty-two percent of workers with an expected income replacement rate below 60 percent expected to stop working before age 65, compared with 29 percent for those in the 60-69 percent replacement range, and 30 percent for those in the 70-79 percent replacement range. Workers expecting to receive retiree health insurance are more likely to expect to stop working before age 65 than workers who do not expect to have retiree health insurance. Twenty-one percent of workers with retiree health insurance expected to stop working before age 65, compared with 12 percent of workers not expecting to receive retiree health insurance. The Social Security Old-Age and Survivors Insurance (OASI) program depends on obtaining sufficient revenue from active workers' payroll taxes to fund the benefits received by retired beneficiaries. Funding the program in the past was in large part effortless because of the relatively large number of workers per retiree. Today, funding the program is a greater challenge because the ratio of workers to retirees has fallen. Policymakers have been able to agree that reform of the program is necessary for its survival; however, the debate over options to reform the program is just beginning, and it is likely to be a long time before a consensus emerges.  相似文献   
153.
Analysis approaches to the evaluation of community interventions must be sensitive to a wide variety of analytic contaminants that may bias the statistical assessment of changes in outcome measures. These contaminants include model misspecifications related to failures to control for community-specific time trends, temporal autocorrelated errors in equations, spatial autocorrelated errors among geographic units, and other failures of unit independence otherwise indexed by estimated intraclass correlations. Although an enormous amount of progress has been made toward the solution of many of these analytic problems over the past years, the contemporary evaluator of community interventions is left with a number of unenviable design and analysis choices; choices that inevitably force an assessment of the relative threats of different sources of error to the internal and external validity of the evaluation. This article describes the choices made for the evaluation of the Community Trial Project outcome data.  相似文献   
154.
With every cigarette we smoke, every fat-filled snack we consume, and every lap we don't take around the track, we risk our health. This state-by-state look at what we do and don't do reveals poor health practices wherever you look.  相似文献   
155.
156.
157.
"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   
158.
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   
159.
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   
160.
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   
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