全文获取类型
收费全文 | 629篇 |
免费 | 55篇 |
专业分类
各国政治 | 10篇 |
世界政治 | 9篇 |
外交国际关系 | 54篇 |
法律 | 452篇 |
中国共产党 | 6篇 |
中国政治 | 6篇 |
政治理论 | 77篇 |
综合类 | 70篇 |
出版年
2024年 | 4篇 |
2023年 | 11篇 |
2022年 | 8篇 |
2021年 | 19篇 |
2020年 | 39篇 |
2019年 | 34篇 |
2018年 | 30篇 |
2017年 | 14篇 |
2016年 | 12篇 |
2015年 | 18篇 |
2014年 | 33篇 |
2013年 | 21篇 |
2012年 | 24篇 |
2011年 | 23篇 |
2010年 | 29篇 |
2009年 | 60篇 |
2008年 | 87篇 |
2007年 | 110篇 |
2006年 | 32篇 |
2005年 | 10篇 |
2004年 | 16篇 |
2003年 | 10篇 |
2002年 | 8篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1999年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1994年 | 2篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 5篇 |
1984年 | 2篇 |
排序方式: 共有684条查询结果,搜索用时 15 毫秒
81.
A Computational Framework for Age‐at‐Death Estimation from the Skeleton: Surface and Outline Analysis of 3D Laser Scans of the Adult Pubic Symphysis
下载免费PDF全文
![点击此处可从《Journal of forensic sciences》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Bridget F. B. Algee‐Hewitt Ph.D. Jieun Kim Ph.D. Dennis E. Slice Ph.D. 《Journal of forensic sciences》2017,62(6):1434-1444
In forensic anthropology, age‐at‐death estimation typically requires the macroscopic assessment of the skeletal indicator and its association with a phase or score. High subjectivity and error are the recognized disadvantages of this approach, creating a need for alternative tools that enable the objective and mathematically robust assessment of true chronological age. We describe, here, three fully computational, quantitative shape analysis methods and a combinatory approach that make use of three‐dimensional laser scans of the pubic symphysis. We report a novel age‐related shape measure, focusing on the changes observed in the ventral margin curvature, and refine two former methods, whose measures capture the flatness of the symphyseal surface. We show how we can decrease age‐estimation error and improve prior results by combining these outline and surface measures in two multivariate regression models. The presented models produce objective age‐estimates that are comparable to current practices with root‐mean‐square‐errors between 13.7 and 16.5 years. 相似文献
82.
Adamczyk Marcin M.Sc. Eng Sieniło Maciej Ph.D. Sitnik Robert Ph.D. Woźniak Adam Ph.D. 《Journal of forensic sciences》2017,62(4):889-899
We present a new generation of three‐dimensional (3D) measuring systems, developed for the process of crime scene documentation. This measuring system facilitates the preparation of more insightful, complete, and objective documentation for crime scenes. Our system reflects the actual requirements for hierarchical documentation, and it consists of three independent 3D scanners: a laser scanner for overall measurements, a situational structured light scanner for more minute measurements, and a detailed structured light scanner for the most detailed parts of tscene. Each scanner has its own spatial resolution, of 2.0, 0.3, and 0.05 mm, respectively. The results of interviews we have conducted with technicians indicate that our developed 3D measuring system has significant potential to become a useful tool for forensic technicians. To ensure the maximum compatibility of our measuring system with the standards that regulate the documentation process, we have also performed a metrological validation and designated the maximum permissible length measurement error EMPE for each structured light scanner. In this study, we present additional results regarding documentation processes conducted during crime scene inspections and a training session. 相似文献
83.
为验证siRNAs对口蹄疫病毒(FMDV)复制的抑制效果,用反转录聚合酶链反应(RT-PCR)扩增Asia 1型口蹄疫病毒Jiangsu/China/2005株的3C基因,克隆入增强型绿色荧光蛋白(EGFP)表达载体pEGFP-N1中,并进行双酶切、PCR及测序鉴定。将阳性重组质粒转染PK-15细胞,检测EGFP的表达和3C基因转录水平。结果显示,经PCR及双酶切鉴定,目的基因片段大小与预期相符,测序结果与Jiangsu/China/2005株相应序列一致。荧光显微镜和流式细胞仪均检测到细胞内有EGFP表达,实时荧光定量PCR检测到细胞内有3C基因的转录。证实,成功构建了FMDV 3C基因与EGFP共表达质粒并在PK-15细胞中获得了表达。 相似文献
84.
长期以来,中美两国对于中美三个联合公报的法律性质存在着极大的争议:中国认为中美三个联合公报是有拘束力的条约,美国却否认这一点。这种争议的结果既严重损害了中美三个联合公报的权威性,更严重阻碍了中美关系的正常发展。根据国际条约法的基本原则和基本理论,特别是从条约的基本特征、美国国内法关于条约的定性、三个联合公报的履约情况等方面进行的深入分析表明,中美三个联合公报确定无疑是有拘束力的条约。基于此,中国政府应该积极寻求维护中美三个联合公报权威性及其条约性质的法律对策。 相似文献
85.
目的观察原发性脑干损伤(PBSI)致死者脑干神经元凋亡及caspase3的表达情况,探讨其法医学意义。方法选择法医学检案中30例确定为原发性脑干损伤致死者脑干,按伤后不同存活时间(t≤5min、5min〈t≤15min、15min〈t≤1h、1h〈t≤24h)分为4组,以5例非脑干损伤死亡者脑干为对照组;分别运用常规HE、免疫组化和TUNEL染色检测中脑、桥脑及延脑重要核团内神经元凋亡及caspase3的表达情况。结果原发性脑干损伤后15min~24h出现明显神经元细胞凋亡(23.2%~35.9%)和caspase3阳性表达(28%~54%),并呈现随损伤时间进行性增加的趋势,与对照组有显著性差异(P〈0.01)。结论原发性脑干损伤早期即出现神经元凋亡及caspase3表达增加,并随损伤时间的延长呈进行性增加,可据此辅助诊断原发性脑干损伤死亡。 相似文献
86.
张亚军 《中华女子学院山东分院学报》2011,(2)
在我国,"剩女"问题作为一个现实的新型社会问题已越来越引起大家的关注.要解决"剩女"问题,第一,应摒弃传统婚恋观,树立正确的婚恋观;第二,社会各界要积极行动,通力合作,提供更多的公益性婚恋平台;第三,"剩女"们应不断解放思想,放宽择偶眼界,降低择偶的物质和利益标准. 相似文献
87.
Gottfried Call 《wohnrechtliche bl?tter: wobl》2007,20(11):315-316
Setzt der Au?erstreitrichter rechtsgestaltend den Aufteilungsschlüssel für die Kosten eines Personenaufzugs auf Antrag eines
Wohnungseigentümers abweichend vom Anteilsverh?ltnis fest, bindet sein Sachbeschluss gem § 32 Abs 5 WEG 2002 s?mtliche zum
Zeitpunkt der Rechtskraft verbücherten Wohnungseigentümer. Dies bewirkt einen Anwendungsfall der sog "wirkungsgebundenen"
einheitlichen Streitpartei aller Gemeinschafter. Da es auf die tats?chliche Nutzung von Gemeinschaftsanlagen durch einen Wohnungseigentümer
nicht ankommt, bildet ausschlie?lich deren objektive und nicht die subjektive Nutzungsm?glichkeit den Ma?stab für den vom
Au?erstreitrichter festzusetzenden, von § 32 Abs 1 WEG 2002 abweichenden Aufteilungsschlüssel. Dessen Ermessensentscheidung
setzt erhebliche Unterschiede in der objektiven Nutzungsm?glichkeit durch einen Wohnungseigentümer voraus. 相似文献
88.
Collins M Heagney A Cordaro F Odgers D Tarrant G Stewart S 《Journal of forensic sciences》2007,52(4):898-903
Five 44 gallon drums labeled as glycidyl methacrylate were seized by the Australian Customs Service and the Australian Federal Police at Port Botany, Sydney, Australia, in December 2004. Each drum contained a white, semisolid substance that was initially suspected to be 3,4-methylenedioxymethylamphetamine (MDMA). Gas chromatography-mass spectroscopy (GC/MS) analysis demonstrated that the material was neither glycidyl methacrylate nor MDMA. Because intelligence sources employed by federal agents indicated that this material was in some way connected to MDMA production, suspicion fell on the various MDMA precursor chemicals. Using a number of techniques including proton nuclear magnetic resonance spectroscopy ((1)H NMR), carbon nuclear magnetic resonance spectroscopy ((13)C NMR), GC/MS, infrared spectroscopy, and total synthesis, the unknown substance was eventually identified as methyl 3-[3',4'(methylenedioxy)phenyl]-2-methyl glycidate. The substance was also subjected to a published hydrolysis and decarboxylation procedure and gave a high yield of the MDMA precursor chemical, 3,4-methylenedioxyphenyl-2-propanone, thereby establishing this material as a "precursor to a precursor." 相似文献
89.
Benjamin Bachrach Ph.D. Anurag Jain M.S. Sung Jung M.S. Robert D. Koons Ph.D. 《Journal of forensic sciences》2010,55(2):348-357
Abstract: Tool mark identification relies on the premise that microscopic imperfections on a tool’s working surface are sufficiently unique and faithfully transferred to enable a one‐to‐one association between a tool and the tool marks it creates. This paper presents a study undertaken to assess the validity of this premise. As part of this study sets of striated tool marks were created under different conditions and on different media. The topography of these tool marks was acquired and the degree of similarity between them was quantified using well‐defined metrics. An analysis of the resulting matching and nonmatching similarity distributions shows nearly error‐free identification under most conditions. These results provide substantial support for the validity of the premise of tool mark identification. Because the approach taken in this study relies on a quantifiable similarity metric, the results have greater repeatability and objectivity than those obtained using less precise measures of similarity. 相似文献
90.
Giovanni Cecchetto M.D. Guido Viel M.D. Federica De Lotto M.D. Renzo Manara M.D. Massimo Montisci M.D. Ph.D. Silvano Zancaner M.D. Ph.D. S. Davide Ferrara M.D. Ph.D. 《Journal of forensic sciences》2010,55(3):845-848
Abstract: Machinery‐related fatalities are one of the leading causes of traumatic occupational deaths. In our report, we present the case of a 40‐year‐old male who suffered a severe head trauma while working in a cut‐foam industry and died despite an early craniectomy. The radiological reconstruction of the skull based on preoperative computed tomography scans disclosed a large depressed conical fracture of the left parietal bone. The 3D‐reconstruction of the work area, combined with a fit‐matching analysis between the machinery and the depressed skull fracture allowed us to conclude that the head was crushed between the sliding bar of the cutting device and the metallic protuberance on the opposite side. The case underlines the importance of a detailed workplace investigation and of a thorough evaluation of all circumstantial, clinical, radiological, and autopsy data in the reconstruction of machinery‐related fatalities to identify any possible legal responsibilities of the worker and/or the employer. 相似文献