全文获取类型
收费全文 | 2115篇 |
免费 | 121篇 |
专业分类
各国政治 | 111篇 |
工人农民 | 102篇 |
世界政治 | 260篇 |
外交国际关系 | 170篇 |
法律 | 990篇 |
中国政治 | 14篇 |
政治理论 | 579篇 |
综合类 | 10篇 |
出版年
2023年 | 9篇 |
2022年 | 6篇 |
2021年 | 17篇 |
2020年 | 27篇 |
2019年 | 48篇 |
2018年 | 83篇 |
2017年 | 92篇 |
2016年 | 90篇 |
2015年 | 64篇 |
2014年 | 63篇 |
2013年 | 332篇 |
2012年 | 81篇 |
2011年 | 84篇 |
2010年 | 63篇 |
2009年 | 69篇 |
2008年 | 89篇 |
2007年 | 103篇 |
2006年 | 88篇 |
2005年 | 83篇 |
2004年 | 72篇 |
2003年 | 84篇 |
2002年 | 68篇 |
2001年 | 35篇 |
2000年 | 39篇 |
1999年 | 37篇 |
1998年 | 23篇 |
1997年 | 22篇 |
1996年 | 21篇 |
1995年 | 15篇 |
1994年 | 29篇 |
1993年 | 19篇 |
1992年 | 19篇 |
1991年 | 28篇 |
1990年 | 24篇 |
1989年 | 17篇 |
1988年 | 16篇 |
1987年 | 8篇 |
1986年 | 16篇 |
1985年 | 23篇 |
1984年 | 11篇 |
1983年 | 16篇 |
1982年 | 15篇 |
1981年 | 14篇 |
1980年 | 14篇 |
1979年 | 8篇 |
1977年 | 10篇 |
1976年 | 6篇 |
1975年 | 4篇 |
1974年 | 6篇 |
1973年 | 4篇 |
排序方式: 共有2236条查询结果,搜索用时 15 毫秒
121.
The Indiana University Advanced Research and Technology Institute (ARTI) is the technology transfer organ of the Indiana University system. ARTIs structure is complex, and has been dynamic since its creation in 1996. This complexity stems in part from the diversity represented by the Indiana University system and from competing interests within the university itself. In addition to the intrinsic value of higher education, the university has the potential to add substantial value to Indianas economic landscape through technology transfer, economic development initiatives and the resulting job creation, but realizing that potential will require effectively leveraging a disconnected network including the IU campuses and critical capabilities contributed by the states other world class institutions. This paper reviews the formation of ARTI, a discussion of its structure and evolving mission, recent initiatives and some possible metrics for technology transfer initiatives. 相似文献
122.
123.
Gel ink pens have become a common writing instrument in the United States. Questioned document examiners often attempt to optically differentiate gel inks from each other and from other non-ballpoint ink writings (e.g., those from roller-ball pens). Since early formulations were primarily pigment-based, they do not elute when analyzed by thin-layer chromatography. However, recent gel ink formulations (i.e., within the past five years) include dye-based inks that can be easily separated. This study differentiates black gel inks using optical and chemical techniques. The techniques include: microscopy, visible and near infrared reflectance, near infrared luminescence, thin-layer chromatography (TLC), spot tests, and gas chromatography/mass spectrometry (GC/MS). As a result of this study a flow chart has been developed allowing for a systematic determination of a questioned ink. In addition, an analysis of volatile compounds found in gel inks revealed that there are some unique ingredients that may be found in gel inks that are not typically found in other non-ballpoint inks. 相似文献
124.
125.
126.
127.
Anecdotal evidence and legend have suggested that bloodhounds are capable of trailing and alerting to a human by his or her individual scent. This same evidence may be presented to a court of law in order to accuse a particular suspect or suspects of a crime. There is little to no scientific evidence confirming the bloodhound's ability to trail and discriminate the scent of different individual humans. Eight bloodhounds (3 novice and 5 veteran), trained in human scent discrimination were used to determine the reliability of evidence, garnered through the use of bloodhounds, in a court of law. These dogs were placed on trails in an environment that simulated real-life scenarios. Results indicate that a veteran bloodhound can trail and correctly identify a person under various conditions. These data suggest that the potential error rate of a veteran bloodhound-handler team is low and can be a useful tool for law enforcement personnel. 相似文献
128.
LaPorte GM Wilson JD Mancke SA Payne JA Ramotowski RS Fortunato SL 《Journal of forensic sciences》2003,48(5):1163-1171
Thermal transfer printing refers to printing processes that utilize heat to produce an image by either physical or chemical means or by a combination of both. As the technology has improved and the supplies have become less expensive, the use of thermal printing in the personal and business markets has increased significantly. Specifically, dye diffusion thermal transfer and thermal mass transfer have become predominant in the production of counterfeit credit cards, drivers' licenses, and other types of documents produced on plastic media. Chemical analysis by means of thin layer chromatography (TLC) has proven to be useful in characterizing various types of inks (e.g., writing and inkjet inks). In this study, the authors examined 81 different samples that included a total of 54 printer samples (43 photographic prints on paper and eleven plastic card samples) and 27 printer ribbons. A new TLC method was developed and tested utilizing a solvent system (80% n-hexane, 3% methyl ethyl ketone, and 17% ethyl acetate) that is capable of producing excellent resolution. 相似文献
129.
Benner BA Goodpaster JV DeGrasse JA Tully LA Levin BC 《Journal of forensic sciences》2003,48(3):554-563
This paper discusses results of a supercritical fluid extraction-gas chromatography/mass spectrometry (SFE-GC/MS) study of small samples ( 100 microg to 1 mg) of human scalp hair. The method offers a number of benefits including greater sensitivity than liquid extraction methods because the entire extractable mass is transferred to the analytical system, compared with only a few percent from a conventional liquid extraction/injection. The project's goals were to determine if SFE-GC/MS analyses of the surface-extractable components of an individual's hair yield consistent chemical profiles and to investigate if the profiles are sufficiently different to distinguish them from those of other individuals. In addition, the mtDNA sequences from ten of the same individuals used in the SFE-GC/MS study from four family units were determined, and, while the families were distinguishable, the maternal relations yielded identical sequences. In tandem, SFE-GC/MS and mtDNA techniques may provide valuable complementary data from forensic hair samples. 相似文献
130.
We develop an empirical estimator directly from an extensive-formcrisis bargaining game with incomplete information and discussits features and limitations. The estimator makes it possibleto draw inferences about states' payoffs from observationaldata on crisis outcomes while remaining faithful to the theorizedstrategic and informational structure. We compare this estimatorto one based on a symmetric information version of the samegame, using the quantal response equilibrium proposed in thiscontext by Signorino (1999, American Political Science Review93:279298). We then address issues of identificationthat arise in trying to learn about actors' utilities by observingtheir play of a strategic game. In general, a number of identifyingrestrictions are needed in order to pin down the distributionof payoffs and the effects of covariates on those payoffs. 相似文献