全文获取类型
收费全文 | 2585篇 |
免费 | 49篇 |
专业分类
各国政治 | 103篇 |
工人农民 | 191篇 |
世界政治 | 98篇 |
外交国际关系 | 77篇 |
法律 | 1537篇 |
中国政治 | 14篇 |
政治理论 | 561篇 |
综合类 | 53篇 |
出版年
2020年 | 18篇 |
2019年 | 30篇 |
2018年 | 94篇 |
2017年 | 53篇 |
2016年 | 113篇 |
2015年 | 43篇 |
2014年 | 38篇 |
2013年 | 137篇 |
2012年 | 157篇 |
2011年 | 116篇 |
2010年 | 39篇 |
2009年 | 53篇 |
2008年 | 35篇 |
2007年 | 45篇 |
2006年 | 62篇 |
2005年 | 417篇 |
2004年 | 145篇 |
2003年 | 62篇 |
2002年 | 41篇 |
2001年 | 48篇 |
2000年 | 24篇 |
1999年 | 25篇 |
1998年 | 17篇 |
1997年 | 17篇 |
1996年 | 18篇 |
1995年 | 17篇 |
1994年 | 22篇 |
1993年 | 20篇 |
1992年 | 42篇 |
1991年 | 44篇 |
1990年 | 47篇 |
1989年 | 51篇 |
1988年 | 38篇 |
1987年 | 46篇 |
1986年 | 51篇 |
1985年 | 30篇 |
1984年 | 31篇 |
1983年 | 27篇 |
1982年 | 22篇 |
1980年 | 19篇 |
1979年 | 19篇 |
1978年 | 27篇 |
1977年 | 15篇 |
1975年 | 19篇 |
1974年 | 33篇 |
1973年 | 23篇 |
1972年 | 17篇 |
1971年 | 22篇 |
1970年 | 20篇 |
1968年 | 14篇 |
排序方式: 共有2634条查询结果,搜索用时 15 毫秒
321.
Dr. Kenneth E. Knight 《The Journal of Technology Transfer》1984,8(2):27-34
The energy industry, especially the petroleum, is critically important to today's society. This industry has historically been accused of being a “good old boy” network that is extremely reluctant and slow to accept technology and change. A closer analysis of the industry shows that it is highly fragmented consisting mostly of firms who operate in only a limited number of functional areas. The analysis also shows that there are many critical current and future problems which could be addressed with technology from any diverse disciplines and industries. Case analyses of existing technology flow through to successful utilization by the petroleum industry describes the technology transfer process and the role played by the different firms inside and outside the industry. 相似文献
322.
323.
A micromethod based on the absorption elution technique was shown to be applicable to the detection of M and N blood groups of dried bloodstains on cotton cloth. Each antigen M and N was tested using two different types of antisera. Two hundred different bloodstains, stored up to six months, were analyzed. Conclusive results were obtained for M typing on 2.5-mm-long bloodstained threads. For N typing, some cross-reactivity of homozygous M stains with anti-N sera was observed. This may be explained by the structure of the M and N antigens on the red cell membrane. 相似文献
324.
Age estimation from the rib by phase analysis: white females 总被引:4,自引:0,他引:4
Metamorphosis at the sternal extremity of the rib has already been established as a reliable indicator of age at death. Using a sample of white males, it was shown that an accurate estimation of age can be made by direct examination of the bone itself. However, because of sexual differences in hormonal production and dimorphism in the skeleton, the present study was carried out to develop an appropriate standard for age determination from the sternal rib in white females. The sample consisted of 86 ribs of known age, sex, and race. Observations were made at the costochondral junction with special attention to pit formation (its shape and depth), changes in the walls and rim surrounding it, and overall bone density and texture. Based on changes in these areas, the ribs were separated into nine phases (0 through 8). The most rapid metamorphosis occurred in Phases 1 through 4 (mean ages 14-28) with changes noticeable at 3 to 4 year intervals. After mean age 28, this process slowed, considerably expanding the interval between phases to 10 to 15 years. The female ribs showed both earlier initial pit formation and a different morphologic pattern of aging as compared with males. Statistical analysis revealed that the features chosen to delineate the phases are valid predictors of age. This study has shown that the sternal rib can provide an accurate estimation of age in females spanning a mean age of 14 to 76 years. 相似文献
325.
326.
Kenneth E. Winker 《Journal of criminal justice》1983,11(4):369-375
This note analyzes the perceived prestige rankings of selected criminal justice/criminology journals comparing samples from the American Society of Criminology (ASC) and the Academy of Criminal Justice Sciences (ACJS). The results indicate that inter- and intrasample comparisons show little agreement with regard to the rankings along both quality and consistency dimensions. However, a closer analysis shows that no significant differences were found between the journal mean weights assigned by members of ASC and ACJS. It is argued that research into journal prestige is important for researchers/authors, editors, and publishers of journals, as well as the consumers of journals. 相似文献
327.
The success of sting operations (fake-fences) has been reported widely with impressive aggregate statistics on arrests and convictions. In this paper, we present a more detailed view of a successful Detroit sting program. We follow a sting participant's involvement from the time he entered the storefront until final sentencing, the result of the sting. Previously unreported statistics that we present include prior convictions and sentences for those involved in the sting, the number of sales an individual made to the sting and data on final sentences. More importantly we explore relationships between the various statistics. Our most important finding is that a sting operation is an effective way of getting criminals off the streets for extended periods of time. Eighty percent of those convicted for receiving and concealing stolen property were incarcerated, and the average minimum sentence was 19 months. The data also suggest the importance of multiple sales by an individual to the sting. The number of sales was shown to affect both the likelihood of conviction and the type of sentence imposed. 相似文献
328.
329.
330.