全文获取类型
收费全文 | 2854篇 |
免费 | 48篇 |
专业分类
各国政治 | 126篇 |
工人农民 | 87篇 |
世界政治 | 163篇 |
外交国际关系 | 71篇 |
法律 | 2050篇 |
中国政治 | 27篇 |
政治理论 | 357篇 |
综合类 | 21篇 |
出版年
2020年 | 36篇 |
2019年 | 27篇 |
2018年 | 29篇 |
2017年 | 37篇 |
2016年 | 49篇 |
2015年 | 33篇 |
2014年 | 42篇 |
2013年 | 211篇 |
2012年 | 66篇 |
2011年 | 72篇 |
2010年 | 44篇 |
2009年 | 40篇 |
2008年 | 63篇 |
2007年 | 85篇 |
2006年 | 78篇 |
2005年 | 77篇 |
2004年 | 74篇 |
2003年 | 76篇 |
2002年 | 75篇 |
2001年 | 164篇 |
2000年 | 131篇 |
1999年 | 81篇 |
1998年 | 29篇 |
1997年 | 26篇 |
1995年 | 23篇 |
1994年 | 28篇 |
1993年 | 26篇 |
1992年 | 68篇 |
1991年 | 73篇 |
1990年 | 62篇 |
1989年 | 85篇 |
1988年 | 85篇 |
1987年 | 75篇 |
1986年 | 77篇 |
1985年 | 68篇 |
1984年 | 39篇 |
1983年 | 43篇 |
1981年 | 44篇 |
1980年 | 26篇 |
1979年 | 30篇 |
1978年 | 21篇 |
1977年 | 29篇 |
1975年 | 33篇 |
1974年 | 30篇 |
1973年 | 33篇 |
1972年 | 32篇 |
1971年 | 24篇 |
1970年 | 20篇 |
1969年 | 26篇 |
1968年 | 20篇 |
排序方式: 共有2902条查询结果,搜索用时 15 毫秒
101.
Increasingly, public administration in the United States operates in a densely interconnected international system in which local decisions and actions may trigger global repercussions—and vice versa—and the fate of communities in one region is bound to the choices of decision makers elsewhere. Administrative actors have become enmeshed in a complicated, interwoven pattern of governance in ways that shape actions, issues, and opportunities for influencing administrative agencies at national, state, and local levels. These developments call for a critical reappraisal of our inherited notions of governance, management, and accountability. Terrorist tragedy and responses to it call attention to these themes, but they apply broadly across the spectrum of governance challenges. To demonstrate this point, we analyze some implications of transnational governance for the institutions and practices of U.S. public management, with particular attention to another subject: environmental policy and management. A conclusion is that the public administration community must adjust traditional practices to facilitate the effective management of the global processes that, in turn, reshape the world. 相似文献
102.
103.
104.
105.
An intoxication following administration of morphine, tramadol and atracurium in a suicide case is reported. The route of administration and the amount of the particular drug were known from the investigation of the death scene and the findings of the postmortem examination. Tramadol was present in the gastric contents as well as in blood, liver, kidney and brain samples, whereas the drug could not be detected in muscle. All body fluids and tissues investigated contained morphine as well as its 3- and 6-glucuronides with the exception of muscle tissue. The concentrations of morphine and its glucuronide metabolites were determined by LC/MS following solid phase extraction. Interestingly, the concentration of M6G in brain, liver and kidney were close to the concentration of M3G in the particular tissue. This phenomenon might be explained by a preferential hydrolysis of M3G or by a preferential formation of M6G postmortem. Measurement of morphine and M6G in femoral blood and cerebrospinal fluid may be a useful indicator in rapid deaths. 相似文献
106.
A blood group substance (BGS), a protein with ABH antigenic activity, was isolated from human seminal plasma and designated as p 84 (Sato, 1995). We have developed a method for determining the ABO blood type of semen by performing a sandwich enzyme-linked immunosorbent assay (ELISA) in which p 84 is captured with an anti-p 84 monoclonal antibody, and evaluated the specificity and sensitivity of this method. Although BGS activity was detected in semen sensitively by this method, it was not detected in saliva, urine, breast milk, blood or vaginal secretions. Since the concentration of p 84 in semen was independent of the secretion status, the status can be determined as non-secretor when p 84 but not BGS activity was detected. To determine the stability of BGS activity on p 84, dried stains of semen on filter paper were kept at 4, 26, and 37 degrees C for 8 months, 2 years and 1 month, respectively, and their BGS activities were examined. After 8 months at 4 degrees C, over 60% of the original BGS activity was recovered from the stain. The activity could be detected even from a square as small as 0.25 by 0.25 cm. After 1 month at 37 degrees C and 2 years at 26 degrees C, 31 and 20% of the BGS activity, respectively, still remained. It could be detected from the pieces of 1.0 by 1.0 cm and 0.5 by 0.5 cm squares, kept for 1 month at 37 degrees C and 2 years at 26 degrees C, respectively. Finally, semen was mixed with saliva or blood at varying volumetric ratios and used for the sources of dried stains. The BGS activity of p 84 could be detected in the stains until the ratio between semen and saliva or blood reached 1:4. We conclude that this sandwich ELISA offers a more sensitive and specific method for determining the ABO blood type of semen samples obtained from sexual assault victims than existing methods, such as the conventional absorption-elution and classical hemagglutination-inhibition tests. 相似文献
107.
Allele frequencies for six DNA polymorphisms have been studied in a population sample from Cantabria (middle north Spain) using the polymerase chain reaction. The HLA-DQA1 locus was analyzed by the reverse dot-blot technique and the other five by polyacrylamide gel electrophoresis followed by silver staining. Six alleles were found for HLA-DQA1. 15 alleles for D1S80, 6 alleles for HUMTHO1 and HUMCSF1PO, 7 for HUMTPOX and 8 alleles for HUMVWA. The 21 repeat allele in HUMVWA had not previously been reported in a Spanish population. The genotype distributions met Hardy-Weinberg expectations for all the systems and some statistical parameters of forensic interest were calculated. Comparisons with other populations revealed significant differences for HLA-DQA1, HUMVWA and HUMTHO1, with interracial differences being more pronounced than between Spanish populations. The HUMVWA system showed the highest forensic efficiency of the six polymorphisms studied. 相似文献
108.
Population data on the X chromosome short tandem repeat locus HumHPRTB in two regions of Germany 总被引:6,自引:0,他引:6
This report contains the results of two population studies on the X chromosome STR HumHPRTB carried out in a Northern and a Southern region of Germany. The numbers of unrelated individuals were 443 and 335, respectively. Eight alleles (alleles 9 to 16) were found. In female individuals 29 different genotypes were encountered. In German populations the HumHPRTB STR was characterized by the following data: PIC = 0.750; HET = 0.769: MEC = 0.556. Allele distribution met the Hardy-Weinberg expectations. The Northern and Southern populations did not show any significant differences. 相似文献
109.
The successive killing of three siblings by their biological mother at two-year intervals is described. The children were 367 days, 75 days and 3 years old. Although sudden infant death syndrome (SIDS) or interstitial pneumonia could not be ruled out as the cause of death in the two younger children, who were killed first, the third child exhibited discrete signs of violence in the mouth and throat area which were interpreted as proof of infanticide. All three children had petechiae of the skin of the face and throat, the upper thorax, the shoulders and the mucous membranes of the mouth. None of the children exhibited signs of a disease-related hemorrhagic tendency. After the mother was convicted of murdering the three-year-old boy by smothering in combination with compression of the thorax, she confessed to having killed the other two children in a similar manner. In the absence of hemostatic disease, the presence of petechiae of the skin extending over the entire drainage area of the Vena cava superior can be regarded as evidence of an increase in pressure in the thoracic cavity secondary to obstruction of the airways with simultaneous chest compression. 相似文献
110.