全文获取类型
收费全文 | 3492篇 |
免费 | 17篇 |
专业分类
各国政治 | 47篇 |
工人农民 | 41篇 |
世界政治 | 380篇 |
外交国际关系 | 90篇 |
法律 | 2627篇 |
中国共产党 | 13篇 |
中国政治 | 45篇 |
政治理论 | 246篇 |
综合类 | 20篇 |
出版年
2022年 | 5篇 |
2018年 | 5篇 |
2016年 | 5篇 |
2015年 | 3篇 |
2014年 | 8篇 |
2013年 | 3篇 |
2012年 | 282篇 |
2011年 | 307篇 |
2010年 | 61篇 |
2009年 | 36篇 |
2008年 | 231篇 |
2007年 | 281篇 |
2006年 | 266篇 |
2005年 | 287篇 |
2004年 | 246篇 |
2003年 | 248篇 |
2002年 | 233篇 |
2001年 | 179篇 |
2000年 | 207篇 |
1999年 | 93篇 |
1998年 | 38篇 |
1997年 | 23篇 |
1996年 | 26篇 |
1995年 | 21篇 |
1994年 | 43篇 |
1993年 | 36篇 |
1992年 | 42篇 |
1991年 | 33篇 |
1990年 | 11篇 |
1989年 | 14篇 |
1988年 | 29篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 14篇 |
1984年 | 16篇 |
1983年 | 21篇 |
1982年 | 17篇 |
1981年 | 14篇 |
1980年 | 18篇 |
1979年 | 19篇 |
1978年 | 11篇 |
1977年 | 5篇 |
1976年 | 10篇 |
1975年 | 7篇 |
1974年 | 4篇 |
1973年 | 6篇 |
1963年 | 7篇 |
1961年 | 2篇 |
1960年 | 3篇 |
1959年 | 3篇 |
排序方式: 共有3509条查询结果,搜索用时 15 毫秒
951.
With heavy-metal-free ammunitions becoming more and more popular, it is necessary to find methods to visualize patterns of those elements in gunshot residues (GSRs) that are not accessible by chemographic coloring tests. The recently introduced millimeter-X-ray fluorescence analysis (m-XRF) spectrometer Spectro Midex M offers an easy way to record mappings of GSRs containing such elements in order to determine shooting distances as well as the general composition of these particles. A motorized stage enables samples of a maximum size of 20 x 20 cm to be investigated, like fabric, clothes, adhesive tapes (Filmolux films), and polyvinylalcohol gloves of shooter's hands. Human tissues can be measured using a Peltier-cooled specimen holder that is mounted onto the stage. As the spot size of the exiting X-rays lies in the millimeter range, which is adequate for the assessment of the residue patterns for shooting distance determination, a significant reduction in measurement time is achieved compared with mu-XRF methods. Test shots with heavy-metal-free ammunitions were performed on different target materials, like pork skin and fabric, and the elemental distributions of Ti, K, and Ga were determined. In order to show the capability of the spectrometer for conventional lead ammunitions as well, a shot series of 5-100 cm shooting distance and an adhesive tape of a shooter's hand were investigated analogously. A comparison of several methods applied in GSR investigation shows the advantages of the m-XRF method. 相似文献
952.
To obtain a reliable estimation on the yield of illicit indoor cannabis cultivation in The Netherlands, cannabis plants confiscated by the police were used to determine the yield of dried female flower buds. The developmental stage of flower buds of the seized plants was described on a scale from 1 to 10 where the value of 10 indicates a fully developed flower bud ready for harvesting. Using eight additional characteristics describing the grow room and cultivation parameters, regression analysis with subset selection was carried out to develop two models for the yield of indoor cannabis cultivation. The median Dutch illicit grow room consists of 259 cannabis plants, has a plant density of 15 plants/m(2), and 510 W of growth lamps per m(2). For the median Dutch grow room, the predicted yield of female flower buds at the harvestable developmental stage (stage 10) was 33.7 g/plant or 505 g/m(2). 相似文献
953.
Martello S Oliva A De Giorgio F Chiarotti M 《The American journal of forensic medicine and pathology》2006,27(1):55-57
A fatality due to ingestion of flurazepam is reported. Flurazepam is a benzodiazepine, a widely prescribed hypnotic drug for use in sleep disorders. There are only few documented reports of the disposition of flurazepam in deaths due to overdose. A 68-year-old woman was found deceased at home with no evidence of trauma or asphyxia. Toxicologic analyses were performed and drug levels measured by means of gas chromatography coupled to mass spectrometry. The flurazepam concentration in each specimen was as follows: heart blood 2.8 microg/mL, bile 323 microg/mL, and urine 172 microg/mL. Presence of flurazepam into gastric content was observed too. Based on the autopsy findings, patient history, and toxicologic results, the cause of death was determined to be acute intoxication of flurazepam and the manner, suicide. 相似文献
954.
Tsokos M Rothschild MA Madea B Rie M Sperhake JP 《The American journal of forensic medicine and pathology》2006,27(1):70-74
Wischnewsky spots in the gastric mucosa are considered an important finding for the diagnosis of hypothermia-related deaths. In the present prospective histological and immunohistochemical investigation, 14 cases of fatal hypothermia presenting Wischnewsky spots at autopsy were studied. Macromorphologically, the lesions, varying in diameter from 0.1 to 0.4 cm, had a blackish-brownish color and appeared partly lofty, especially on the apex of gastric folds. Histologically, no erosions or ulcers were observed in the gastric mucosa. In some cases, hemorrhages in conjunction with infarctions of the mucosa were observed in the mucosal glands. Those regions, however, did not represent the lesions visible as Wischnewsky spots at the macroscopical level. Immunohistochemical stains were done with a specific antibody against hemoglobin (Dako, Glostrup, Denmark). Wischnewsky spots expressed immunopositivity with antihemoglobin. Concerning the pathogenesis and underlying pathophysiologic mechanisms contributing to the development of Wischnewsky spots, we hypothesize that cooling of the body in the setting of cold ambient temperatures primarily leads to circumscribed hemorrhages of the gastric glands in vivo or in the agonal period, respectively. Subsequently, due to autolysis, erythrocytes are destroyed and hemoglobin is released. Following exposure to gastric acid, hemoglobin is hematinized, leading to the typical blackish-brownish appearance of Wischnewsky spots seen at gross examination. Wischnewsky spots are not equivalent to erosions in terms of histopathological diagnosis but rather represent epiphenomena generated in vivo or in the agonal period of fatal hypothermia. 相似文献
955.
Turillazzi E D'Errico S Neri M Fineschi V 《The American journal of forensic medicine and pathology》2006,27(2):166-168
A very unusual homicide of 2 children by smothering and strangulation by means of a rubber adhesive band carried out by the mother who committed suicide by the same manner is presented. Smothering is supposed to be one major cause of death in child homicide. Suicide by smothering is relatively uncommon. Suicidal smothering by winding strips of adhesive tape around the head to cover the nose and mouth is an even rarer method recently described in literature. The circumstances of the crime and the macroscopic and microscopic evidence are discussed to reduce the potential for underdiagnoses or mistakes in such cases in which it may be difficult to establish whether suicide or homicide occurred. 相似文献
956.
Between July 1995 and June 1996, 533 subjects underwent forensic psychiatric investigation I Sweden. Odd case numbers (n = 268) were included in the study. Of these 268 people, 50% had been in contact with psychiatric services during the six-month period preceding the crime leading to forensic psychiatric assessment. Contacts with psychiatric services during the six-month period preceding the crime were significantly more common in three categories of individuals than others. These were: women, individuals who were diagnosed as having a psychotic disorder during the forensic psychiatric investigation, and individuals found to suffer from a serious mental disorder as defined in the legislation. Subjects who were found not to suffer from a serious mental disorder and were thus not eligible for special sanctions on medicolegal grounds had significantly less psychiatric contacts before the crime, as did subjects under 20 years of age. However, these two groups still had considerably more psychiatric contacts than the general population. The present results suggest that the patient category studied requires special monitoring and case management in general psychiatry in Sweden. To this end, we call for closer studies of high-risk individuals, particularly of previously violent offenders and potentially violent offenders, and closer studies of their psychiatric contacts. This will provide a basis for the development of adequate programs and guidelines for effective care and treatment within the psychiatric sector. 相似文献
957.
The authenticity of recovered memories is a much debated issue. Surprisingly, no study has systematically looked at symptom overreporting in people claiming recovered memories of childhood sexual abuse (CSA). In a first sample we administered the Structured Inventory of Malingered Symptomatology (SIMS) to individuals who said they had recovered CSA memories (n=66), individuals who said their CSA had always been accessible (continuous CSA memory group; n=119), and controls who said they had no CSA experiences (n=83). In a second sample individuals reporting recovered (n=45) or continuous (n=45) CSA memories completed the Morel Emotional Numbing Test (MENT). Our aim was to compare these groups with regard to their tendency to overreport symptoms. The results indicate that people with recovered memories do not score higher on the SIMS and the MENT than other CSA survivors suggesting that symptom overreporting is not typical for people reporting recovered memories. 相似文献
958.
Zúñiga J Ilzarbe M Acunha-Alonzo V Rosetti F Herbert Z Romero V Almeciga I Clavijo O Stern JN Granados J Fridkis-Hareli M Morrison P Azocar J Yunis EJ 《Forensic science international》2006,164(2-3):266-270
Allelic frequencies of 15 short tandem repeats (STR) markers (CSF1PO, FGA, THO1, TPOX, VWA, D3S11358, D5S818, D7S820, D8S1179, D13S317, D16S539, D18S51, D21S11, D19S433 and D2S1338) were determined using the AmpFl STR Identifiler PCR Amplification Kit in Puerto Rican American individuals (N=205) from Massachusetts. The FGA, D18S51 and D2S1338 loci had a high power of discrimination (PD) with values of 0.967, 0.965 and 0.961, respectively. Significant deviations from the Hardy-Weinberg (HW) equilibrium were not detected. An important genetic contribution of Caucasian European (76.4%) was detected in Puerto Rican Americans. However, comparative analysis between Puerto Rican American and other neighboring populations from United States mainly with African and Caucasian Americans, revealed significant differences in the distribution of STR markers. Our results are important for future comparative genetic studies of different American ethnic groups, in particular a cultural group called Hispanic-Americans and should be helpful for forensic and paternity testing. 相似文献
959.
Toklu AS Alkan N Gürel A Cimsit M Haktanir D Körpinar S Purisa S 《Forensic science international》2006,164(2-3):122-125
INTRODUCTION: When a body is recovered from the water after a fatal SCUBA diving accident, it is useful to know if the diver was under pressure or not when he/she took his/her last breath, in order to determine the cause and manner of the death. If the victim was under pressure, the air remained in the lungs of the diver will be equal to the environmental pressure. If the body comes to the surface, the air in the lung will expand according to the Boyle's Gas Law and give mechanical damage to the surrounding tissues, due to decreases in environmental pressure. We designed an experimental study to see the difference in pulmonary autopsy findings of the rats that drowned under normobaric and hyperbaric conditions. METHOD: Forty five male, 250-300 g, Sprague Downey adult rats were divided into three groups. Two groups of rats were drowned under normobaric conditions (Groups DS Group DSS) and the third group at 50 ft pressure (Group DD). The pulmonary autopsy findings of the groups were compared. In the light microscopy, the number of the microscopic fields (x10) containing at least one emphysematous area with longitudinal dimension greater than 300 micro m were compared among the groups. RESULTS: The gross examination revealed a prominent swelling of the lungs in all rats in the Group DD, in comparison to that of the Groups DS and DSS. The number of the microscopic fields, which included at least one emphysematous area with longitudinal dimension greater than 300 micro m out of 150 fields from each of the groups DS, DSS and DD, were 88, 101 and 115 respectively. The difference between the group DS and DD was found to be statistically significant. CONCLUSION: We conclude that in investigating the fatal diving accidents, pulmonary autopsy findings give valuable information whether the death occurred at the surface or at the depth. 相似文献
960.
Margulies S Prange M Myers BS Maltese MR Ji S Ning X Fisher J Arbogast K Christian C 《Forensic science international》2006,164(2-3):278-9; author reply 282-3