全文获取类型
收费全文 | 518篇 |
免费 | 39篇 |
专业分类
各国政治 | 38篇 |
工人农民 | 59篇 |
世界政治 | 52篇 |
外交国际关系 | 56篇 |
法律 | 257篇 |
中国政治 | 9篇 |
政治理论 | 82篇 |
综合类 | 4篇 |
出版年
2023年 | 11篇 |
2022年 | 3篇 |
2021年 | 8篇 |
2020年 | 28篇 |
2019年 | 19篇 |
2018年 | 35篇 |
2017年 | 44篇 |
2016年 | 40篇 |
2015年 | 29篇 |
2014年 | 24篇 |
2013年 | 68篇 |
2012年 | 23篇 |
2011年 | 14篇 |
2010年 | 16篇 |
2009年 | 18篇 |
2008年 | 15篇 |
2007年 | 25篇 |
2006年 | 29篇 |
2005年 | 17篇 |
2004年 | 14篇 |
2003年 | 9篇 |
2002年 | 18篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 6篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有557条查询结果,搜索用时 46 毫秒
101.
Our contribution to the expanding literature on the globalization of research and innovation is to investigate the extent
to which sector-specific developments in an emerging technology (such as increasing interdisciplinarity and complexity) affect
inventive activities developed abroad. We look at how technological diversity and scientific excellence of host countries
in the field of nanotechnology affect the development of inventive activities by US multinational companies (MNCs). We identify
the most active US-based MNCs in nanotechnology-related patenting and examine location decisions of these companies and their
international subsidiaries. Econometric results confirm our hypothesis that the technological breadth of host countries positively
influences the expected number of inventions developed abroad by US MNCs. Science capabilities of countries also have a positive
impact on the decision to invent abroad, while the influence of market specific factors is less clear. We interpret these
results as suggesting that host country science capabilities are important to attract innovative activities by MNCs, but as
the interdisciplinary and convergent nature of nanotechnology evolves, access to a broadly diversified knowledge base becomes
important in increasing the relative attractiveness of host locations.
相似文献
Philip ShapiraEmail: |
102.
Andrea K. Webb Charles R. Honts John C. Kircher Paul Bernhardt Anne E. Cook 《Legal and Criminological Psychology》2009,14(2):279-292
Purpose. There were three objectives of this study: (1) To assess the possibility of using pupil diameter as an index of deception in the context of a comparison question polygraph test. (2) To determine if pupil diameter would make a significant contribution to an optimal multivariate classification equation in combination with the traditional predictor variables used in field polygraph practice. (3) We explored the possibility of replacing one or more of the traditional predictor variables with pupil diameter. Methods. We used a laboratory mock crime experiment with 24 participants, half of whom stole $20 (US) from a secretary's purse. Participants were tested with a comparison question test modelled after standard field practice. Physiological measures were taken with laboratory quality instrumentation. Features were extracted from the physiological measures. Those features were subjected to a number of different statistical analyses. Results. Innocent participants showed larger increases in pupil diameter in response to probable‐lie questions than to relevant questions. Guilty participants did not show differential responding to the question types. The additional of pupil diameter to a multivariate classification model approached, but did not reach significance. Subsequent analyses suggest that pupil diameter might be used to replace the traditional relative blood pressure measure. Conclusions. Pupil diameter was found to be a significant predictor variable for deception. Pupil diameter may be a possible replacement for the traditional relative blood pressure measure. Additional research to explore that possibility would seem to be warranted. 相似文献
103.
While it is known that diesel fuel combustion engines produce much lower concentrations of carbon monoxide (CO) than gasoline engines, these emissions could certainly generate lethal ambient concentrations given a sufficient amount of time in an enclosed space and under suitable environmental conditions. The authors report a case of CO poisoning which was initially referred for autopsy as a presumed natural death of a truck driver found in the secure cab of a running diesel tractor trailer truck. Completion of the preliminary investigation ascribed death to complications of ischemic heart disease (IHD), pending toxicological analysis that included quantification of CO. When the toxicology results showed lethal blood COHbg, the cause of death was re-certified as CO intoxication secondary to inhalation of (diesel) vehicular exhaust fumes. Because of the unique source of fatal CO intoxication in this case, the contributory IHD and the possible contaminants in the putrefied blood, a 10-year retrospective review was conducted on all nonfire related CO deaths autopsied (n = 94) at the Office of the Chief Medical Examiner in Louisville, KY from 1994 to 2003. For validation of the COHbg detection method used by the Kentucky Office of Forensic Toxicology (KYOFT), blood samples from these cases along with controls were submitted to three laboratories using various analytical methods yielding no statistically significant differences. Lastly, an extensive literature review produced no scientifically reported cases of fatal CO poisoning attributed to diesel fuel exhaust. 相似文献
104.
This article examines the use of the term sustainabledevelopment in Acts of the Scottish and UK Parliaments.It begins by examining the UK's traditional reluctance to legislateon sustainable development, the more recent reversal of thatapproach and some definitional issues surrounding the term.It then moves on to consider the sustainable development provisionsin detail examining their form, strength and limits, and howthey can be monitored, reviewed and enforced both inside andoutside court. The article concludes that over and above anysymbolic value, in many instances the provisions also have legalsignificance. The formulations vary and while some are simplymaterial considerations to be used in decision-making, thosewhich set out mandatory requirements such as reports do createbinding legal rules. Furthermore, there are a few examples wherethe duty or objective is set out as a clear legal rule thatcould be interpreted as providing a framework for decision-making. 相似文献
105.
Sudden fatal cases of influenza B infection in a 4-year-old girl and a 2-year-old boy are presented. Both children complained of abdominal pain without respiratory, neurologic or cardiac symptoms; additionally the girl had vomiting within 2 days of death. Autopsy revealed histological changes in the respiratory system consistent with a viral infection. Influenza B infection was identified by immunohistochemistry in the girl and real-time polymerase chain reaction in the boy. Additional testing including cultures, toxicology, and screening for metabolic disorders were negative. These cases illustrate the usefulness of viral testing, especially for influenza, in the medical legal autopsy of children even when the classic respiratory symptoms of flu are lacking. 相似文献
106.
Himmelberger AL Spear TF Satkoski JA George DA Garnica WT Malladi VS Smith DG Webb KM Allard MW Kanthaswamy S 《Journal of forensic sciences》2008,53(1):81-89
The 608-bp hypervariable region 1 (HV1) sequences from 36 local dogs were analyzed to characterize the population genetic structure of canid mitochondrial DNA (mtDNA). Sixteen haplotypes were identified. A 417-bp segment of this sequence was compared with GenBank sequences from a geographically representative sample of 201 dogs, two coyotes, and two wolves. Sixty-six haplotypes were identified including 62 found only in domestic dogs. Fourteen of these correspond to the 16 local haplotypes and were among the most frequent haplotypes. The local sample was judged to be representative of the much broader geographic sample. No correlation was observed between local haplotypes and the owner's characterization of dog breed. A 60-bp variation "hotspot" within the canid HV1 was identified as a potentially valuable molecular tool, particularly for assaying limited or degraded DNA samples. 相似文献
107.
Mechthild Prinz Asako Ishii Andrea Coleman Howard J. Baum Robert C. Shaler 《Forensic Science International Supplement Series》2001,120(3)
A series of validation experiments was performed for a Y chromosome specific STR multiplex system following the suggestions made by the Technical Working Group DNA Analysis Methods (TWGDAM). The multiplex PCR products were detected on Perkin-Elmer 373 and 377 automated sequencers using two labeling colors. No problems regarding the stability, robustness and sensitivity of the Y STR multiplex were observed. Mixture studies revealed a cut off rate similar to autosomal STRs for mixtures of male DNAs and no interference of any female admixture. The comparison of the Y STR results to the autosomal typing results for 56 nonprobative semen stains and swabs, showed a slightly higher success rate in detecting the semen donor’s alleles for the Y STR multiplex. Two examples are shown to illustrate the usefulness of Y STR typing for DNA mixtures. In one case the Y STR results confirmed an isolated exclusion; in the other case, the interpretation of a mixture was clarified since the Y STR results proved the presence of DNA from at least two semen donors. Y STR typing is a valuable addition to the forensic DNA testing panel. 相似文献
108.
109.
Andrea Ciambra 《Public administration review》2013,73(1):193-197
110.
Andrea Park 《北京周报(英文版)》2013,56(20):48
When I was in high school, I went on a family vacation to Ocho Rios, Jamaica. I was getting lunch at a grilled chicken stand, when the cook asked me, "Miss Chin, where are you from?" (Jamaicans use Miss Chin as an affectionate nickname for all Chinese women.) I answered, "I’m from New Jersey, but I’m Korean." He practically dropped his spatula. "Whaaaat? I never met Korean Japanese Miss Chin fromNewJersey!"heshouted.Thatwas the only time I’ve had someone 相似文献