全文获取类型
收费全文 | 11626篇 |
免费 | 1244篇 |
专业分类
各国政治 | 409篇 |
工人农民 | 376篇 |
世界政治 | 840篇 |
外交国际关系 | 284篇 |
法律 | 9000篇 |
中国共产党 | 1篇 |
中国政治 | 82篇 |
政治理论 | 1805篇 |
综合类 | 73篇 |
出版年
2020年 | 338篇 |
2019年 | 339篇 |
2018年 | 385篇 |
2017年 | 446篇 |
2016年 | 460篇 |
2015年 | 427篇 |
2014年 | 418篇 |
2013年 | 1166篇 |
2012年 | 268篇 |
2011年 | 359篇 |
2010年 | 531篇 |
2009年 | 484篇 |
2008年 | 275篇 |
2007年 | 248篇 |
2006年 | 355篇 |
2005年 | 239篇 |
2004年 | 228篇 |
2003年 | 225篇 |
2002年 | 204篇 |
2001年 | 439篇 |
2000年 | 346篇 |
1999年 | 297篇 |
1998年 | 143篇 |
1997年 | 129篇 |
1996年 | 103篇 |
1995年 | 131篇 |
1994年 | 141篇 |
1993年 | 115篇 |
1992年 | 216篇 |
1991年 | 235篇 |
1990年 | 217篇 |
1989年 | 230篇 |
1988年 | 208篇 |
1987年 | 178篇 |
1986年 | 207篇 |
1985年 | 226篇 |
1984年 | 220篇 |
1983年 | 185篇 |
1982年 | 147篇 |
1981年 | 131篇 |
1980年 | 129篇 |
1979年 | 151篇 |
1978年 | 92篇 |
1977年 | 79篇 |
1976年 | 67篇 |
1975年 | 71篇 |
1974年 | 77篇 |
1973年 | 64篇 |
1972年 | 55篇 |
1971年 | 56篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
721.
722.
This article discusses the phenomenon of "context effects" by reviewing the findings and practices of a range of scientific fields, including astronomy, physics, biology, medicine, and especially the relevant research and theory from psychology. Context information, such as expectations about what one is supposed to see or conclude, has been found to have a small but relentless impact on human perception, judgment, and decision-making. The article then considers the vulnerability of forensic science practice to context effects, and concludes by suggesting that forensic science adopt practices familiar in other fields of scientific work, in particular blind or double-blind testing and also the use of evidence line-ups. 相似文献
723.
724.
725.
726.
727.
728.
A method was developed to screen for pepper spray residue using instruments and methods other than those techniques commonly employed to analyze chemical residue (i.e.. gas chromatography mass spectrometry-GCMS or liquid chromatography mass spectrometry-LCMS). The method employed gas chromatography (GC), thin layer chromatography (TLC), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) to screen for dried pepper spray stains. Pepper sprays from nine different manufacturers were investigated. Capsaicin and dihydrocapsaicin were identified and unique IR reflectance spectra are presented. An additional five compounds were presumptively found. Results showed that a particular stain could be characterized as a pepper-based stain. 相似文献
729.
Grinage BD 《Journal of forensic sciences》2003,48(4):861-868
This article discusses psychiatry's limited conceptualization of volitional capacity and its application to sexually violent predator laws by exploring two legal opinions critical to predator case law (Kansas v. Hendricks and Kansas v. Crane). The author reviewed pertinent psychiatric literature on impaired volition to identify potential contributions and limitations that psychiatry may offer the legal field. Assessment of the ego dystonic nature of impaired self-regulation, utilization of recent advances in self-assessment and laboratory evaluation of impulsive behavior, and dimensional categorization of a volitional capacity construct are recommended as an approach to the assessment and understanding of an inability to control concept. This paper concludes that elements of volition may be psychiatrically evaluated in a way that contributes to the Court's understanding of that capacity. However, further study is needed to operationally define volitional capacity and address issues of assessment validity and reliability. 相似文献
730.
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