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   2155篇
  免费   92篇
各国政治   165篇
工人农民   69篇
世界政治   261篇
外交国际关系   127篇
法律   945篇
中国共产党   1篇
中国政治   7篇
政治理论   655篇
综合类   17篇
  2023年   11篇
  2022年   15篇
  2021年   15篇
  2020年   30篇
  2019年   44篇
  2018年   64篇
  2017年   68篇
  2016年   82篇
  2015年   61篇
  2014年   60篇
  2013年   441篇
  2012年   66篇
  2011年   64篇
  2010年   78篇
  2009年   60篇
  2008年   73篇
  2007年   98篇
  2006年   74篇
  2005年   76篇
  2004年   85篇
  2003年   56篇
  2002年   52篇
  2001年   32篇
  2000年   49篇
  1999年   29篇
  1998年   31篇
  1997年   33篇
  1996年   26篇
  1995年   26篇
  1994年   29篇
  1993年   17篇
  1992年   18篇
  1991年   18篇
  1990年   23篇
  1989年   16篇
  1988年   19篇
  1987年   20篇
  1986年   14篇
  1985年   16篇
  1984年   12篇
  1983年   13篇
  1982年   22篇
  1981年   12篇
  1980年   7篇
  1979年   13篇
  1978年   12篇
  1975年   7篇
  1971年   6篇
  1970年   8篇
  1969年   9篇
排序方式: 共有2247条查询结果,搜索用时 15 毫秒
991.
Routine ABO grouping tests performed on vaginal swabs from a group O female showed the presence of blood group B activity as well as the expected A and H activity after intercourse with her group A partner. The source of the B activity was readily detectable using the Laboratory's routine elution test, but it was not detectable when a monoclonal anti-B was used and detection by the inhibition technique was possible only with a selected antiserum. A possible explanation of the reactions observed is that the acquired B is capable of reacting with only a portion of the antibodies present in normal polyclonal anti-B sera.  相似文献   
992.
993.
Many authors have suggested adapting treatment programs to the specific needs of sexual abusers. However, little research has been conducted to understand what these patients seek in therapy or what elements play a key role in keeping them in treatment. In this pilot study, fifteen (N=15) pedophile sexual abusers from La Macaza clinic for sexual abusers were interviewed. Plan analysis was used to investigate the most prevalent components involved in staying in or leaving therapy. Results suggest that many components involved in the plans leading to doing and to avoiding treatment were similar. Differences were found in regards to the outcome of confrontations with the therapists, a tendency to isolate and overcomply, guilt related to the abuse, a need for a stable environment, and a need to be accepted. These results are discussed along with possible ways to improve the patients' involvement in treatment.  相似文献   
994.
The authors describe a new, easy-to-use barcode-based tissue collection, preservation and body tracking system, which might prove instrumental in the containment of mass fatalities such as aircraft accidents, war related accidents, environmental disasters (e.g. earthquakes, hurricanes, and floods) terrorist bombings or mass murders.  相似文献   
995.
The most important thing we have learned about violence against women over the past 20 years is that violence is gendered and learned and can only be understood in the context of gender inequality. Most violence is male, and although some violence is done by females, it is far from equal and often done for very different reasons. Among other major findings is that children from violent households tend to grow up to be problematic, which means that a major method of curbing juvenile delinquency in 10 years is to stop violence against women today.  相似文献   
996.
Many of the federal and state programs that provide income security to U.S. families have their roots in the Social Security Act (the Act) of 1935. This Act provided for unemployment insurance, old-age insurance, and means-tested welfare programs. The Great Depression was clearly a catalyst for the Social Security Act of 1935, and some of its provisions--notably the means-tested programs--were intended to offer immediate relief to families. However, the old-age insurance program-the precursor to today's Old-Age, Survivors, and Disability Insurance, or Social Security, program-was not designed specifically to deal with the economic crisis of that era. Indeed, monthly benefit payments, under the original Act, were not scheduled to begin until 1942. In addition, from the beginning, the Social Security program has embodied social insurance principles that were widely discussed even before the onset of the Great Depression. The first four decades of the Social Security program were, in general, ones of expansion. In fact, the program was expanded even before it became truly operational. In 1939, amendments added child, spouse, and survivor benefits to the retirement benefits authorized by the 1935 Act. Those amendments also allowed for monthly benefits to begin in 1940. Although the program was not changed substantially during the war years and the initial postwar period, the 1950s were a transformational decade in the program's history: benefit amounts were increased substantially, coverage under the program became close to universal, and a new disability insurance benefit was offered. The 1960s witnessed additional growth in Social Security, but the most important development in social insurance occurred in health insurance, with the creation of the Medicare program in 1965. Legislative actions in the 1970s had profound effects on the Social Security program and, indeed, set the stage for many of today's reform debates. Large benefit increases, a new benefit formula that was erroneously generous, and other changes in the early 1970s created a situation in which annual program costs, as a share of gross domestic product, increased during a 12-year period from about 3 percent to 5 percent. In 1977, amendments to the Act corrected the flawed benefit formula and made other changes in the financing of the system to shore up the program. Thus, the 1970s represent a watershed in the program's history-program growth gave way to increasing concerns about the program's finances. Those concerns were reflected in the amendments to the Act in 1983, which were the last major changes to the program. These amendments, based largely on recommendations from a commission chaired by Alan Greenspan, adjusted benefits and taxes to address pressing near-term financing problems faced by the system. Although the Greenspan Commission focused to a large extent on short-range issues, the resulting reforms have generated large surpluses in the program and the buildup of a substantial trust fund. However, the looming retirement of the baby boomers and several other demographic factors will, according to projections, result in the exhaustion of the trust fund by 2042.  相似文献   
997.
Black Canadians share many aspects of the historical experiences of African Americans, but there are also important differences. One similarity between these two groups is the persistent academic underachievement of Black adolescents. Although this is a subject of widespread concern in both countries, it has received little empirical scrutiny in Canada. We address this shortcoming by examining the academic and achievement-related beliefs of Black high school students in two Canadian cities, Toronto and Halifax. Despite significant regional differences most participants believed that schooling could lead to success for them. Females’ attitudes and beliefs regarding education were more positive than those of males. Perceived parental values and support were strong predictors of participants’ attitudes and school marks; socioeconomic status (SES) and perceived peer support were non-significant correlates of academic outcomes. We discuss the results in terms of the germane US research, and highlight the implications of the findings for understanding diversity among Black Canadian youth.Received PhD from the University of Toronto. Areas of research include educational and psychological correlates of ethnic and racial identity in Black Canadians.Received PhD from the University of Toronto. Research focuses on the cultural dimensions of friendship.Received PhD from the University of Toronto. Research interests include adolescent development, social justice, and children’s rights-related thinking and knowledge.  相似文献   
998.
On the basis of activities of a federally funded national center for school mental health, review of literature on principles for best practice in child and adolescent mental health and school health, and consultation with national experts and family members, a set of 10 principles for best practice in school mental health was developed. A survey was developed enabling 1–6 point Likert ratings (clearly unimportant to clearly important) for each of the 10 principles. With an original sample of 426 people involved in education, school health or mental health, all 10 principles were strongly endorsed, receiving mean ratings ranging between 5.10 and 5.75. On the basis of qualitative feedback from this survey and interactive forums, language for 9 of the 10 principles was revised and a survey reflecting these changes was developed and administered to a validation sample of 86 respondents. As with the original sample, endorsements of the principles were strong, with mean ratings ranging between 5.45 and 5.79. Findings are discussed in relation to advancing interconnected agendas related to quality assessment and improvement and empirically supported practice in school mental health.  相似文献   
999.
Although seat belts significantly reduce the extent and severity of injuries sustained by motor vehicle occupants, seat belts are known to be associated with chest and abdominal trauma. Less commonly understood are severe neck injuries caused by the use of two-point automatic shoulder harnesses without concurrent use of a manual lap belt. Such injuries may include cervical spine fractures, craniocervical dislocations and rarely decapitation. Recognizing patterned injuries caused by seat belts and the ability to correlate autopsy findings with the circumstances surrounding the death will allow for correct interpretation of seat-belt related trauma. The four cases described detail fatal neck injuries as a result of improper seat belt use in which an automatic two-point shoulder harness was used without a manual lap restraint. In two of the cases, the victims were decapitated.  相似文献   
1000.
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