全文获取类型
收费全文 | 377篇 |
免费 | 40篇 |
专业分类
各国政治 | 1篇 |
世界政治 | 1篇 |
外交国际关系 | 1篇 |
法律 | 319篇 |
中国共产党 | 1篇 |
中国政治 | 39篇 |
政治理论 | 8篇 |
综合类 | 47篇 |
出版年
2024年 | 3篇 |
2023年 | 6篇 |
2022年 | 4篇 |
2021年 | 13篇 |
2020年 | 24篇 |
2019年 | 14篇 |
2018年 | 8篇 |
2017年 | 12篇 |
2016年 | 10篇 |
2015年 | 21篇 |
2014年 | 28篇 |
2013年 | 30篇 |
2012年 | 32篇 |
2011年 | 25篇 |
2010年 | 23篇 |
2009年 | 26篇 |
2008年 | 26篇 |
2007年 | 28篇 |
2006年 | 18篇 |
2005年 | 6篇 |
2004年 | 13篇 |
2003年 | 9篇 |
2002年 | 10篇 |
2001年 | 4篇 |
2000年 | 9篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有417条查询结果,搜索用时 31 毫秒
391.
传统的指印显现方法虽简便易行,却存在灵敏度及分辨率不够高、对现场勘查人员的身体有害等问题,为检验鉴定工作造成一定的困难。因此,需要开发新型的显现方法,以克服上述困难。本文介绍了针对吸烟者汗潜指印中存在的尼古丁代谢产物-可替宁,利用抗原抗体反应进行指印显现的技术,经过处理的指印在特定波长紫外线的激发后即可显现出指印纹线,同时还能确认指印遗留者个人生活信息,不失为一种指印显现领域的新探索。 相似文献
392.
随着科学技术的发展和疾病知识的普及,潜伏性人身损害的赔偿问题日益引起重视。既有立法基本不对损害进行界定,潜伏性人身损害更不会在立法文本中得到体现,但是既有损害概念的学理解释可以为潜伏性人身损害的赔偿提供认识基础。对潜伏性人身损害予以赔偿有其必要性,但是也会对传统侵权法带来挑战。虽然如此,既有司法实践还是积极回应受害人的赔偿诉求,从概念扩张和利益平衡等角度进行了大胆探索。为了有效解决潜伏性人身损害的赔偿问题,既需要从损害概念的更新方面做出努力,又需要从诉讼中的证明责任、证明能力等角度进行变革。 相似文献
393.
394.
395.
396.
目的对新型荧光502粉末显现非渗透性光滑客体表面潜手印的一步荧光502显现新技术和传统502胶水熏显+荧光染料染色显现手印技术进行比较研究。方法比较实验研究,对荧光502粉末和502胶水使用同一自动熏显柜先后进行熏显,荧光502粉末熏显结束后直接在蓝光灯下激发进行观察和拍照;502胶水在熏显完成和聚合物完全固化后使用罗丹明6G和BBD溶液进行荧光染色,再进行光致荧光照相。结果一步熏显和二次染色的显现效果基本相同,但两者的显现效果也因检材性质和遗留时间的不同而存在一些差别。结论新型荧光502粉末可以作为一种显现非渗透性光滑客体表面上潜手印的常用方法,尽管新方法对某些客体的显现效果并不好,但对大多数客体来说,其显现效果并不弱于二次染色的方法,并且使用新型荧光502粉末进行一步熏显不会引入有机溶剂,不会引起502聚合物的溶解或造成破坏,确保了纹线及其细节特征不被损坏,也避免了染色后因漂洗不当使手印纹线被冲掉的可能,还不会破坏脱落细胞等生物检材。 相似文献
397.
Martyna Czarnomska MSc Aneta Lewkowicz PhD Mattia Pierpaoli PhD Emilia Gruszczyńska MSc Magdalena Kasprzak PhD Zygmunt Gryczyński PhD Piotr Bojarski PhD Sławomir Steinborn PhD Krzysztof Woźniewski PhD 《Journal of forensic sciences》2024,69(2):437-447
The detection of potentially harmful substances presents a multifaceted challenge. On one hand, it can directly save lives, on the other, it can significantly aid and enhance police work, thereby increasing the effectiveness of investigations. The research conducted in this study primarily aims to identify paracetamol in fingerprints, considering situations involving direct contact of a person with paracetamol either chronically or in a single dose. The identification procedure presented, utilizing Raman spectroscopy, aims to rapidly detect the xenobiotic following ingestion by an individual, which involves touching the tablet with their fingers—this can be termed as touch evidence in forensic science investigations. Additionally, the authors focus on assessing the impact of additives present in drugs containing paracetamol as the main active ingredient. The screening results obtained will enable us to analyze the composition of drugs in terms of potentially toxic substances, and their influence on the physicochemical activity of the active substance. We successfully identified the paracetamol molecule using a noninvasive forensic trace detection method. Samples in the form of common drugs containing 500 mg of paracetamol were studied. Throughout the study, comprehensive validation of the method was ensured through the utilization of a statistical model, which excluded sensitivity to the presence of other substances, whether additives or from the external environment. The proposed approach to trace the content of substances in fingerprint using Raman scattering analysis provides a useful starting point to enhance current analytical methods not only in forensic science but also in toxicology. 相似文献
398.
Visualization of fingerprint deposits by digital color mapping of light reflected from the surface of heated brass, copper, aluminum, and tin has been investigated using Adobe® Photoshop®. Metals were heated to a range of temperatures (T) between 50°C and 500°C in 50°C intervals with enhancement being optimal when the metals are heated to 250°C, 350°C, 50°C, and 300°C, respectively, and the hue values adjusted to 247°, 245°, 5°, and 34°, respectively. Fingerprint visualization after color mapping was not degraded by subsequent washing of the metals and color mapping did not compromise the visibility of the fingerprint for all values of T. The optimum value of T for fingerprint visibility is significantly dependent of the standard reduction potential of the metal with Kendall's Tau (τ) = 0.953 (p < 0.001). For brass, this correlation is obtained when considering the standard reduction potential of zinc rather than copper. 相似文献
399.
A calibration test is described for monitoring the operation of equipment used to develop latent fingerprints on thermal paper by the application of either controlled or uncontrolled heat. A working solution of a water/glycerol emulsion and butylene glycol is applied to thermal paper by means of either a vinyl stamp and pad, or a marker pen. Varying the amount of butylene glycol enables the thermal paper to change color at different temperatures between approximately 40 and 60°C, which is below the normal color change temperature of the paper. The described test may be used to verify the correct operation, at different temperatures, of a controlled heat source during and after fingerprint development (such as the Hot Print System) or to monitor the paper temperature with an uncontrolled heat source (such as a warm air blower), thereby avoiding unintentional coloring of the entire paper surface. 相似文献
400.
目的探索新的手印显现方法,祛除传统手印显现方法对使用者的健康危害;方法用浅色调湿粉采用不同操作对不同客体表面手印、不同物质手印及不同遗留时间手印进行显现,通过显现效果的比较,得出湿粉显现手印的适用范围、最佳操作方法及其显现效果;结果显出的手印清晰、流畅,与背景反差强;结论该方法适用于光滑非渗透性客体表面及潮湿或粘性表面的汗潜、油潜、蛋白手印的显现,使用方便有效。 相似文献