全文获取类型
收费全文 | 157篇 |
免费 | 37篇 |
专业分类
外交国际关系 | 11篇 |
法律 | 168篇 |
综合类 | 15篇 |
出版年
2023年 | 8篇 |
2022年 | 7篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 7篇 |
2018年 | 7篇 |
2017年 | 9篇 |
2016年 | 10篇 |
2015年 | 13篇 |
2014年 | 11篇 |
2013年 | 8篇 |
2012年 | 10篇 |
2011年 | 14篇 |
2010年 | 7篇 |
2009年 | 11篇 |
2008年 | 10篇 |
2007年 | 13篇 |
2006年 | 10篇 |
2005年 | 6篇 |
2004年 | 6篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有194条查询结果,搜索用时 31 毫秒
81.
Passive infrared technology was used to film diurnal and nocturnal scavenging behavior of brown rats and gray squirrels at the University of Tennessee's Anthropological Research Facility. This direct documentation demonstrated that brown rats modified fat-laden cancellous bone while gray squirrels generally gnawed the thicker bone cortices only after fats had leached away. A case study placed in a shaded portion of the Facility indicated the postmortem interval for initial gnawing by gray squirrels was slightly over 30 months. An examination of 53 human skeletons in the William M. Bass Forensic Skeletal Collection revealed that 10 cases had gnaw marks consistent with those made by gray squirrels. One of the 10 cases had been gnawed within 16 months of time-since-death, while the remaining nine had postmortem intervals >30 months. Additional observed modifications made to nonhuman bone by gray squirrels indicate that squirrel gnaw marks on bone can serve as a minimal estimate of time-since-death in a temperate environment similar to that of East Tennessee. 相似文献
82.
We tested a new approach to the stature prediction that could be used in the identification process of human skeletal remains of unknown identity. The stature of 19 female and 21 male adult cadavers was measured within 24 h after death and considered to be equal to the living stature. The antero-posterior radiographs of all limbs were taken, and the maximum length of the six long bones was measured from radiographs. There was a significant difference in the stature and maximum length of long bones between female and male cadavers (p<0.001 for all). The correlation between the stature and long bone length was the best for the humerus in females (r=0.792) and the tibia in males (r=0.891). Regression equations specific to the Croatian population were computed separately for each long bone in males and females and proven to be reliable in predicting the living stature of the individual. 相似文献
83.
Between February 1999 and May 2005, 116 DNA extractions were completed on skeletal remains from routine casework. Overall, at least a partial mitochondrial DNA (mtDNA) profile was obtained on 83.6% of samples. Skeletal remains fell into two general categories: (1) samples for body identifications submitted by law enforcement and (2) samples submitted to answer historical or family identity questions. Body identification cases were more likely to yield full mtDNA profiles, whereas historical cases were more likely to result in partial profiles. Overall, the ability to obtain a full or partial profile primarily reflects the difference in the average age and condition of the samples in these two categories and thus, difference in the quantity and quality of the DNA. Cremated remains were uniformly unsuccessful, whereas infant/fetal remains were uniformly successful. Heteroplasmy in skeletal remains was observed at a rate similar to that in hair ( approximately 10%). For body identification cases, skeletal remains had the same mtDNA profile as the accompanying reference sample in 50% of cases. 相似文献
84.
85.
86.
将 175只 10周龄伊莎蛋鸡随机分为A、B、C、D、E共 5组 ,分别在每千克饲料中添加维生素D3(VD3) 0、10 0、2 0 0、5 0 0和 10 0 0IU ,试验期 10周。试验期间每隔 2周测定骨矿含量。试验开始及结束时杀鸡取胫骨 ,进行组织学检查。试验结束时 ,A、B、C、D、E组骨矿总平均值分别为0 .6 6 8g/cm2 ± 0 .0 82g/cm2 、0 .6 79g/cm2 ± 0 .10 2g/cm2 、0 .6 92g/cm2 ± 0 .10 3g/cm2 和 0 .6 6 8g/cm2 ± 0 .0 81g/cm2 、0 .6 47g/cm2 ± 0 .0 79g/cm2 。C组骨矿含量显著高于A、D、E组 (P <0 .0 5 )。骨组织学检查亦显示 ,试验开始时 ,青年蛋鸡皮质骨、骨小梁正常 ;试验结束时 ,低VD3组和高VD3组皮质骨都出现了不同程度吸收腔增多的现象 ,且严重程度与VD3缺乏或过量程度呈正相关性。试验结果表明 ,青年蛋鸡日粮中添加适宜剂量的VD3,可增加骨量 ,维持良好的骨结构。 相似文献
87.
Erwin Vermeij M.S. Peter Zoon Ph.D. Mayonne van Wijk M.S. Reza Gerretsen M.D. 《Journal of forensic sciences》2015,60(3):770-776
Dissolving bodies is a current method of disposing of human remains and has been practiced throughout the years. During the last decade in the Netherlands, two cases have emerged in which human remains were treated with acid. In the first case, the remains of a cremated body were treated with hydrofluoric acid. In the second case, two complete bodies were dissolved in a mixture of hydrochloric and sulfuric acid. In both cases, a great variety of evidence was collected at the scene of crime, part of which was embedded in resin, polished, and investigated using SEM/EDX. Apart from macroscopic findings like residual bone and artificial teeth, in both cases, distinct microscopic residues of bone were found as follows: (partly) digested bone, thin‐walled structures, and recrystallized calcium phosphate. Although some may believe it is possible to dissolve a body in acid completely, at least some of these microscopic residues will always be found. 相似文献
88.
羊驼副性腺结构的组织化学研究 总被引:3,自引:0,他引:3
为了解羊驼的生殖生理特性,采用大体解剖与组织学方法对羊驼副性腺的形态结构进行了研究。结果显示,羊驼副性腺有前列腺和尿道球腺,没有精囊腺。尿道球腺呈圆形,位于坐骨弓处,前列腺位于尿生殖道起始部的背侧,每一腺体都有腺管开口于尿生殖道;羊驼副性腺的基本组织结构和其他哺乳动物相似,但有较小的差异。尿道球腺为有许多弯曲分枝的复管泡状腺,分泌物较为黏稠,PAS染色强阳性,呈鲜红色;前列腺为复管泡状腺,前列腺的分泌物是一种稀薄的蛋白样液,PAS染色阳性,染色较浅。结果证实,羊驼前列腺和尿道球腺可分泌较多的糖物质,使精子生存较长时间;羊驼繁殖慢的特点可能与其生存环境差,易造成流产或妊娠期长且为单胎有关,而并不是精液本身的问题。 相似文献
89.
Alberto Amadasi M.D. Daniele Merli B.Sc. Alberto Brandone B.Sc. Cristina Cattaneo M.D. Ph.D. 《Journal of forensic sciences》2014,59(1):195-198
Soot soiling is a crucial forensic parameter around gunshot lesions. Carbonization, however, can severely alter human tissues and mimic such clues. This study aims at evaluating the survival of soot soiling even after carbonization in bone. A total of 36 bovine ribs (half fleshed and half defleshed) were shot with two types of bullet (both 9‐mm; full metal‐jacketed and unjacketed) with a near‐contact range. With unjacketed bullets, the shot left in every case a clear, black, and roughly round soot stain around the entrance wound, whereas full metal‐jacketed bullets left no signs of soot. Every specimen then underwent calcination in an oven at 800°C. The analysis of the charred samples clearly showed the survival of the soot soiling in both fleshed and bony samples, with a clear correspondence with the former position, but with a different color (yellow). Thus, soot soiling may survive, although with a different color, even after charring. 相似文献
90.
Manual localization of bone fragments on the ground or on complex surfaces in relation to accidents or criminal activity may be time‐consuming and challenging. It is here investigated whether combining a near‐infrared hyperspectral camera and chemometric modeling with false color back‐projection can be used for rapid localization of bone fragments. The approach is noninvasive and highlights the spatial distribution of various compounds/properties to facilitate manual inspection of surfaces. Discriminant partial least squares regression is used to classify between bone and nonbone spectra from the hyperspectral camera. A predictive model (>95% prediction ability) is constructed from raw chicken bones mixed with stone, sand, leaves, moss, and wood. The model uses features in the near‐infrared spectrum which may be selective for bones in general and is able to identify a wide variety of bones from different animals and contexts, including aged and weathered bone. 相似文献