全文获取类型
收费全文 | 7598篇 |
免费 | 89篇 |
专业分类
各国政治 | 333篇 |
工人农民 | 221篇 |
世界政治 | 470篇 |
外交国际关系 | 276篇 |
法律 | 5034篇 |
中国政治 | 34篇 |
政治理论 | 1284篇 |
综合类 | 35篇 |
出版年
2020年 | 160篇 |
2019年 | 168篇 |
2018年 | 177篇 |
2017年 | 209篇 |
2016年 | 212篇 |
2015年 | 202篇 |
2014年 | 182篇 |
2013年 | 740篇 |
2012年 | 153篇 |
2011年 | 171篇 |
2010年 | 207篇 |
2009年 | 225篇 |
2008年 | 165篇 |
2007年 | 157篇 |
2006年 | 170篇 |
2005年 | 158篇 |
2004年 | 177篇 |
2003年 | 159篇 |
2002年 | 137篇 |
2001年 | 310篇 |
2000年 | 253篇 |
1999年 | 229篇 |
1998年 | 99篇 |
1997年 | 65篇 |
1996年 | 70篇 |
1995年 | 80篇 |
1994年 | 88篇 |
1993年 | 89篇 |
1992年 | 153篇 |
1991年 | 157篇 |
1990年 | 147篇 |
1989年 | 156篇 |
1988年 | 123篇 |
1987年 | 138篇 |
1986年 | 125篇 |
1985年 | 132篇 |
1984年 | 102篇 |
1983年 | 118篇 |
1982年 | 83篇 |
1981年 | 79篇 |
1980年 | 57篇 |
1979年 | 109篇 |
1978年 | 70篇 |
1977年 | 60篇 |
1976年 | 53篇 |
1975年 | 49篇 |
1974年 | 58篇 |
1973年 | 56篇 |
1972年 | 44篇 |
1968年 | 40篇 |
排序方式: 共有7687条查询结果,搜索用时 0 毫秒
261.
The case of a 22‐year‐old male Caucasian driver is presented. He was involved in a traffic collision. At the roadside, he displayed blank stare and mellow speech with a barely audible voice. A DRE found low body temperature, rigid muscle tone, normal pulse, lack of horizontal and vertical gaze nystagmus, nonconvergence of the eyes, dilated pupil size, and normal Pupillary reaction to light. A standard toxicology DUID protocol was performed on the driver's whole blood including ELISA and GC‐MS drug screens with negative results. Additional drug screening was undertaken for bath salts and synthetic cannabinoid receptor agonists by LC‐MS/MS by a commercial laboratory and identified the synthetic cannabinoid receptor agonist XLR‐11 in the driver's blood. XLR‐11 was subsequently quantified at 1.34 ng/mL. This is the first documented case involving a driver operating a motor vehicle under the influence of the synthetic cannabinoid receptor agonist XLR‐11. 相似文献
262.
This article describes and analyses three recent decisions by the Swedish Data Inspection Board (Datainspektionen) directly focused on cloud computing. All three decisions were published on 28 September 2011 as part of a supervisory project seeking to clarify what demands the Data Protection Act places on organisations utilising cloud computing. As such, and due to the fact that similar concerns arise in the three matters, there is considerable overlap between the three decisions. Indeed, large parts of text are identical in the three decisions. To avoid repetition, I discuss the first decision in most detail, and limit the discussion of overlapping issues in the context of the other two decisions. 相似文献
263.
Roxane M. Limmen B.A.S. Manon Ceelen Ph.D. Udo J.L. Reijnders Ph.D. S. Joris Stomp M.Sc. Koos C. de Keijzer M.Sc. Kees Das Ph.D. 《Journal of forensic sciences》2013,58(2):518-522
The use of narrow‐banded visible light sources in improving the visibility of injuries has been hardly investigated, and studies examining the extent of this improvement are lacking. In this study, narrow‐banded beams of light within the visible light spectrum were used to explore their ability in improving the visibility of external injuries. The beams of light were induced by four crime‐lites® providing narrow‐banded beams of light between 400 and 550 nm. The visibility of the injuries was assessed through specific long‐pass filters supplied with the set of crime‐lites®. Forty‐three percent of the examined injuries improved in visibility by using the narrow‐banded visible light. In addition, injuries were visualized that were not visible or just barely visible to the naked eye. The improvements in visibility were particularly marked with the use of crime‐lites® “violet” and “blue” covering the spectrum between 400–430 and 430–470 nm. The simple noninvasive method showed a great potential contribution in injury examination. 相似文献
264.
Forensic arthropod succession patterns are known to vary between regions. However, the northern habitats of the globe have been largely left unstudied. Three pig carcasses were studied outdoors in Whitehorse, Yukon Territory. Adult and immature insects were collected for identification and comparison. The dominant Diptera and Coleoptera species at all carcasses were Protophormia terraneovae (R‐D) (Fam: Calliphoridae) and Thanatophilus lapponicus (Herbst) (Fam: Silphidae), respectively. Rate of decomposition, patterns of Diptera and Coleoptera succession, and species dominance were shown to differ from previous studies in temperate regions, particularly as P. terraenovae showed complete dominance among blowfly species. Rate of decomposition through the first four stages was generally slow, and the last stage of decomposition was not observed at any carcass due to time constraints. It is concluded that biogeoclimatic range has a significant effect on insect presence and rate of decomposition, making it an important factor to consider when calculating a postmortem interval. 相似文献
265.
Tarini Fernando M.B. B.S. Calle Winskog M.D. Roger W. Byard M.D. 《Journal of forensic sciences》2013,58(4):1085-1087
A 51‐year‐old man was found dead face down and partially submerged in a bathtub alongside two hairdryers. The hairdryers had continued to work, as the victim had bypassed the electrical board of the house prior to dropping them into the water. This had resulted in death due to electrocution, with subsequent heating of the bath water causing marked putrefaction and softening of the immersed body parts. The back and feet, which were not submerged, were preserved. The degree of anterior decomposition was not in keeping with the postmortem interval; however, regional decomposition with sparing of the back and feet provided a clue at autopsy as to the sequence of events. Individuals with training in, or knowledge of, electrical circuitry are capable of modifying domestic wiring so that safety switches and/or fuses can be bypassed ensuring that electrical devices will continue to function even while under water. 相似文献
266.
Alberto Amadasi M.D. Daniele Merli B.Sc. Alberto Brandone B.Sc. Pasquale Poppa B.Sc. Daniele Gibelli M.D. Cristina Cattaneo Ph.D. M.D. 《Journal of forensic sciences》2013,58(4):964-966
Gunshot residue (GSR) has been sought and demonstrated on many types of material and with many techniques. Inductively coupled plasma optical emission spectrometry (ICP‐OES) could be a useful method on difficult substrates, but a systematic study on burnt material has never been performed. Hence, this study aims at evaluating the usefulness and reliability of this method on burnt samples. Sixteen adult bovine ribs (eight with soft tissues, eight totally skeletonized) were shot using two kinds of projectile (both 9 mm full metal‐jacketed or unjacketed). Then, every sample was led to complete calcination in an electric oven. The area of the gunshot entrance wound was swabbed and analyzed by ICP‐OES; the results were also correlated with a previously published parallel study by scanning electron microscopy (SEM) equipped with an SEM–energy dispersive X‐ray analyzer. ICP‐OES proved to be very sensitive and reliable even on degraded material and can be an appropriate nondestructive method for detecting residues on difficult and delicate substrates such as burnt bone. 相似文献
267.
Dawasaz A.A. B.D.S. M.D.S. Ajit D. Dinkar B.D.S. M.D.S. 《Journal of forensic sciences》2013,58(6):1621-1627
The palatine rugae possess unique characteristics that could be used when it is difficult to identify a dead person according to fingerprints or dental records. They are permanent and unique to each person. The rugae are surrounded by cheeks, lips, tongue, and buccal pad of fat; hence, they remain protected in trauma, incineration, or mass disasters. Their pattern of orientation is formed by the 12th to 14th week of gestation and remains stable throughout life. In this study, dental casts of 120 patients were analyzed for individual rugae characteristics and strength and subsequent individual codes were given. No two individuals were having exactly matching rugae codes. Dimensions of rugae pattern, incisive papilla, and midpalatal raphe were also noted. Rugae were reevaluated after one year to check its stability, which showed no significant difference. The coding system followed can be adopted as a good and simple technique to achieve electronic transfer of the records of the palatal rugae. 相似文献
268.
Ritva Karinen M.Cs. Vigdis Vindenes M.D. Ph.D. Inge Morild M.D. Lene Johnsen B.A. Ilah Le Nygaard M.D. Asbjørg S. Christophersen Ph.D. 《Journal of forensic sciences》2013,58(5):1393-1396
Two deep frozen persons, a female and a male, were found dead in a car. There had been an explosive fire inside the car which had extinguished itself. On the floor inside the car were large pools of liquid which smelled of gasoline. The autopsy findings and routine toxicological analyses could not explain the cause of death. Carboxyhemoglobin levels in the blood samples were <10%. Analysis with a headspace gas chromatography revealed methyl tert‐butyl ether (MTBE) concentrations of 185 mg/L (female victim) and 115 mg/L (male victim) in peripheral blood. The urine MTBE concentrations were 150 mg/L and 256 mg/L, respectively. MTBE is a synthetic chemical which is added to gasoline as a fuel oxygenate. Gasoline poisoning is likely to be the cause of the death in these two cases, and MTBE can be a suitable marker of gasoline exposure, when other volatile components have vaporized. 相似文献
269.
Danielle M. Butzbach Ph.D. Peter C. Stockham B.Sc. Hilton J. Kobus Ph.D. D. Noel Sims B.Sc. Roger W. Byard M.D. Robert J. Lokan M.Sc. George Stewart Walker Ph.D. 《Journal of forensic sciences》2013,58(1):90-100
The stability of two benzisoxazole antipsychotics was determined in vitro in decomposing porcine blood inoculated with bacteria, utilizing a high‐performance liquid chromatography with ultraviolet and fluorescence detection method for drug quantitation. Stability experiments for risperidone and paliperidone were conducted at 7, 20 and 37°C for 4 days using sterile and bacterially inoculated porcine blood. The drugs were stable in sterile blood at each temperature and in inoculated blood at 7°C, but degraded significantly in inoculated blood at 20 and 37°C. Complete loss occurred within 2 days when incubated at 37°C. The benzisoxazole‐cleaved degradation products for both drugs were identified as 2‐hydroxybenzoyl‐risperidone and 2‐hydroxybenzoyl‐paliperidone utilizing liquid chromatography quadrupole‐time‐of‐flight mass spectrometry and accurate mass measurements. The degradation products have been found in postmortem case studies, including one case where risperidone and paliperidone were not detected, indicating complete conversion can occur in situ. 相似文献
270.
Although prior research has had a tendency to confirm a negative association between religiousness and crime, criminologists have been slow to incorporate new concepts and emergent issues from the scientific study of religion into their own research. The self‐identity phrase “spiritual but not religious” is one of them, which has been increasingly used by individuals who claim to be “spiritual” but disassociate themselves from organized religion. This study first examines differences in crime between “spiritual‐but‐not‐religious” individuals and their “religious‐and‐spiritual,” “religious‐but‐not‐spiritual,” and “neither‐religious‐nor‐spiritual” peers in emerging adulthood. Specifically, we hypothesize that the spiritual‐but‐not‐religious young adults are more prone to crime than their “religious” counterparts, while expecting them to be different from the “neither” group without specifying whether they are more or less crime prone. Second, the expected group differences in crime are hypothesized to be explained by the microcriminological theories of self‐control, social bonding, and general strain. Latent‐variable structural equation models were estimated separately for violent and property crimes using the third wave of the National Longitudinal Study of Adolescent Health. The overall results tend to provide a partial support for the hypotheses. Implications for criminology and future research are discussed. 相似文献