全文获取类型
收费全文 | 1349篇 |
免费 | 62篇 |
专业分类
各国政治 | 134篇 |
工人农民 | 59篇 |
世界政治 | 131篇 |
外交国际关系 | 60篇 |
法律 | 606篇 |
中国共产党 | 1篇 |
中国政治 | 22篇 |
政治理论 | 390篇 |
综合类 | 8篇 |
出版年
2023年 | 6篇 |
2022年 | 6篇 |
2021年 | 10篇 |
2020年 | 22篇 |
2019年 | 33篇 |
2018年 | 31篇 |
2017年 | 40篇 |
2016年 | 44篇 |
2015年 | 36篇 |
2014年 | 45篇 |
2013年 | 239篇 |
2012年 | 34篇 |
2011年 | 41篇 |
2010年 | 35篇 |
2009年 | 22篇 |
2008年 | 40篇 |
2007年 | 35篇 |
2006年 | 55篇 |
2005年 | 50篇 |
2004年 | 43篇 |
2003年 | 47篇 |
2002年 | 49篇 |
2001年 | 25篇 |
2000年 | 26篇 |
1999年 | 24篇 |
1998年 | 27篇 |
1997年 | 29篇 |
1996年 | 20篇 |
1995年 | 14篇 |
1994年 | 21篇 |
1993年 | 26篇 |
1992年 | 9篇 |
1991年 | 13篇 |
1990年 | 11篇 |
1989年 | 16篇 |
1988年 | 22篇 |
1987年 | 10篇 |
1986年 | 15篇 |
1985年 | 10篇 |
1984年 | 17篇 |
1983年 | 7篇 |
1982年 | 11篇 |
1981年 | 9篇 |
1979年 | 18篇 |
1978年 | 9篇 |
1976年 | 8篇 |
1975年 | 6篇 |
1971年 | 5篇 |
1968年 | 5篇 |
1967年 | 6篇 |
排序方式: 共有1411条查询结果,搜索用时 15 毫秒
81.
In an era when everyone wants to be a millionaire, governments struggle to attract and retain highly qualified employees, making it more important than ever to understand what attracts people to the public service. Using contingency table analysis and logistic regression on the 1989 and 1998 General Social Surveys, we explore how individuals' demographic characteristics and the importance they place on various job qualities influence their preference for and employment in the public sector. Job security may still be the strongest attraction of government jobs, but high income and the opportunity to be useful to society also attract some Americans to the public service. Minorities, veterans, Democrats, and older Americans preferred public-sector jobs more than whites, nonveterans, Republicans, and younger Americans, who were otherwise similar. Women and college graduates were more likely than comparable men and less-educated respondents to have government jobs, but no more likely to prefer them. Overall, desire for government jobs declined markedly between 1989 and 1998. 相似文献
82.
83.
84.
Subscribing to a Burkean view of representation, legislators have long tended to resist constant public scrutiny. In recent years, however, they have overcome this reluctance in a large number of countries and voted to allow the televising of their proceedings. But why they did so remains a mystery. Some media theorists argue that television exposure is a 'great democratizer'. It demystifies public authority figures and obliges them to become more accountable for their actions. The experience of the British House of Lords and the United States Senate suggests instead that television was invited in by rational political actors as a means of achieving their goals in a time of change. In this view, television is best seen not as a force in its own right, but as a medium of communication that can be strategically deployed by goal-oriented political élites responding to different political circumstances and institutional incentive structures. 相似文献
85.
86.
Indigenous and linguistic minorities are in an inferior economic and social position. The ethnic concentration of inequality
is increasingly being recognized in the literature. In this review, studies from six Latin American countries that estimate
the costs to an individual of being an economic minority are reviewed. The studies decompose the overall earnings gap into
two components. One is the portion attributable to differences in the endowments of income-generating characteristics (“explained”
differences) and the other is attributable to differences in the returns that majority and minority workers receive for the
same endowment of income-generating characteristics (“unexplained”). This latter component is often taken as reflecting the
“upper bound” of wage discrimination. In two studies for Bolivia, one using a 1966 survey and the other a 1989 survey, decomposition
of the differential between indigenous and nonindigenous earnings leads to the conclusion that most of the overall differential
is due to productivity. In Guatemala, Mexico and Peru, only one-half of the earnings differential can be attributed to differences
in productivity-enhancing characteristics. In Paraguay, decomposition of the overall earnings differential between monolingual
Spanish speakers and Guaraní speakers shows that most of the differential is explained by human capital differences. In Brazil,
however, there is a significant cost to “being non-white.”
Harry Anthony Patrinos is a Senior Education Economist at the World Bank. He leads the Economics of Education Thematic Group
and manages EdInvest (www.worldbank.org/edinvest), the Education Investment Information Facility. He is co-author ofDecentralization of Education: Demand-Side Financing (1997). His latest co-edited book isPolicy Analysis of Child Labor: A Comparative Study (St. Martin's Press, 1999).Indigenous People and Poverty in Latin America: An Empirical Analysis (edited with George Psacharopoulos), was one of the first studies of the socioeconomic situation of indigenous peoples in
Latin America. 相似文献
87.
Lewis RJ Huffine EF Chaturvedi AK Canfield DV Mattson J 《Journal of forensic sciences》2000,45(4):898-901
During fatal aviation accident investigations, biosamples from the victims are submitted to the FAA Civil Aeromedical Institute (CAMI) for drug analysis. In the process of one such analysis by CAMI, an unknown substance was found in a urine sample. Simultaneous screening by thin layer chromatography (TLC) and gas chromatography/FID (GC/FID) suggested the presence of pseudoephedrine. A subsequent routine confirmation analysis of a separate urine aliquot by GC Fourier transform infrared (GC/FTIR) and GC mass spectrometry (GC/MS) indicated that the retention times of the unknown substance matched with those of pseudoephedrine. However, its infrared and mass spectra were different--the -OH and -NH groups were missing, a C-O-C group was present, and the molar mass was 12 atomic mass units (amu) more than that of pseudoephedrine. A subsequent literature search suggested that ephedrine-like amines react with aldehydes to form oxazolidines. Therefore, the 12-amu increase could be accounted for by condensation of pseudoephedrine with formaldehyde. Since this aldehyde is present in various grades of methanol and ethyl acetate, and these solvents were used during the solid-phase extraction, 3,4-dimethyl-5-phenyl-1,3-oxazolidine was synthesized by using (+)-pseudoephedrine HCl and formaldehyde. The analytical findings of the synthesized compound were consistent with those of the unknown interfering substance, confirming that it was the oxazolidine. Aldehyde contaminants in solvents or specimens can transform drugs of interest and may result in misidentification of a compound originally present in specimens. Therefore, chemicals used in analyses should be of the highest available purity, and a multi-analytical approach should be adopted to maintain a high degree of quality assurance. 相似文献
88.
Morphine-3-D glucuronide stability in postmortem specimens exposed to bacterial enzymatic hydrolysis
Carroll FT Marraccini JV Lewis S Wright W 《The American journal of forensic medicine and pathology》2000,21(4):323-329
Medical examiners frequently rely on the finding of free morphine present in postmortem specimens to assist in certifying deaths associated with narcotics. In vitro hydrolysis of morphine-3-D glucuronide (M3DG) to free morphine was studied using variable specimen pH, initial degree of specimen putrefaction, storage temperature and time, and the effectiveness of sodium fluoride (NaF) preservation. Reagent M3DG was added to opiate-free fresh blood and urine and to autopsy-derived blood specimens. Reagent bovine glucuronidase was also added to certain specimens. Freshly collected and refrigerated NaF-preserved blood produced minimal free morphine, whereas four of five autopsy blood specimens produced free morphine from M3DG. Increased storage time, temperature, and initial degree of putrefaction resulted in greater free morphine generation despite the absence of viable bacteria. Hydrolysis occurring during specimen storage can generate free morphine from M3DG and may result in erroneous conclusions in certifying narcotic deaths. 相似文献
89.
90.