全文获取类型
收费全文 | 10515篇 |
免费 | 585篇 |
专业分类
各国政治 | 431篇 |
工人农民 | 358篇 |
世界政治 | 816篇 |
外交国际关系 | 312篇 |
法律 | 7112篇 |
中国共产党 | 1篇 |
中国政治 | 55篇 |
政治理论 | 1971篇 |
综合类 | 44篇 |
出版年
2021年 | 62篇 |
2020年 | 193篇 |
2019年 | 235篇 |
2018年 | 232篇 |
2017年 | 295篇 |
2016年 | 298篇 |
2015年 | 245篇 |
2014年 | 269篇 |
2013年 | 996篇 |
2012年 | 238篇 |
2011年 | 306篇 |
2010年 | 288篇 |
2009年 | 303篇 |
2008年 | 288篇 |
2007年 | 259篇 |
2006年 | 279篇 |
2005年 | 250篇 |
2004年 | 252篇 |
2003年 | 232篇 |
2002年 | 242篇 |
2001年 | 465篇 |
2000年 | 419篇 |
1999年 | 293篇 |
1998年 | 181篇 |
1997年 | 149篇 |
1996年 | 124篇 |
1995年 | 122篇 |
1994年 | 144篇 |
1993年 | 134篇 |
1992年 | 197篇 |
1991年 | 217篇 |
1990年 | 206篇 |
1989年 | 213篇 |
1988年 | 206篇 |
1987年 | 192篇 |
1986年 | 233篇 |
1985年 | 208篇 |
1984年 | 159篇 |
1983年 | 169篇 |
1982年 | 113篇 |
1981年 | 121篇 |
1980年 | 85篇 |
1979年 | 131篇 |
1978年 | 74篇 |
1977年 | 73篇 |
1976年 | 69篇 |
1974年 | 73篇 |
1973年 | 66篇 |
1972年 | 66篇 |
1970年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
311.
312.
313.
This article analyzes the reasons why individuals oppose the siting of nuclear waste repositories close to their hometowns. In a simple model based on survey data, we show that the willingness to accept such facilities largely depends on economic criteria, namely expected economic impacts and risk estimates. However, the predictive power of such a model is improved by focusing not only on the consequences—as economic models typically do—but also on the procedural aspects. We show that acceptable siting rules contribute positively to the willingness of local residents to host a noxious facility. Acceptable rules, it is found, are essentially fair rules. 相似文献
314.
During 2005, the European Union and China marked 30 years of diplomatic relations with much fanfare. Celebrations surrounding
the anniversary however belied the fact that throughout most of this period the European Union and China remained largely
aloof from one another. The strengthening of EU foreign policy over time, as well as the economic reforms and new outward
orientation exhibited by China have changed the dynamics of the relationship. Both sides are increasingly recognizing the
potential mutual benefits that can be accrued from a closer relationship. This paper assesses EU-China relations from both
economic and political perspectives. In terms of economics, it is clear that the EU must build stronger relations with China
if it is to accrue the benefits of access to an expanding market with over one billion people. To do so successfully however,
the EU will have to reconcile the economic and political components of its foreign policy. The EU continues to challenge the
Chinese government to reform its practices on a number of issues including human rights, democratic reform, and Tibet, all
of which remain bones of contention. How the EU achieves the balance between political constraints and economic opportunities
is the primary focus of this paper.
相似文献
Carol M. Glen (Corresponding author)Email: |
Richard C. MurgoEmail: |
315.
Victoria S. Kwol Turgay Avci Kayode K. Eluwole Angela Dalhatu 《Journal of Public Affairs (14723891)》2020,20(3)
Food handlers are essential in the fight for the prevention of foodborne disease outbreaks as they are critical in ensuring the delivery of safe and healthy food to the consumers. The current study build on knowledge, attitude, and practice model (KAP) to investigate the impact of food handlers' knowledge and attitude on the hygienic‐sanitary conditions of food delivered to the consumers in Nigerian hospitality sector. Using data collected from food handlers in restaurants, hotels and hospitals in Jos metropolis of Nigeria, the study revealed that handlers applied food safety measures to the level of their knowledge. Further investigation revealed that KAP model works effectively in the case of food handlers in Jos. We conclude with recommendations for the industry and education institutes where handlers are trained. 相似文献
316.
Hayter Christopher S. Rasmussen Einar Rooksby Jacob H. 《The Journal of Technology Transfer》2020,45(1):1-8
The Journal of Technology Transfer - University technology transfer is often associated with formal transmission of science-based inventions, for instance through the licensing of patented... 相似文献
317.
Marloes E. M. Vester M.D. Ph.D. Kurt B. Nolte M.D. Ph.D. Gary M. Hatch M.D. Chandra Y. Gerrard M.P.H. B.S. Reinoud D. Stoel Ph.D. Rick R. van Rijn M.D. Ph.D. 《Journal of forensic sciences》2020,65(5):1568-1573
Postmortem computed tomography (PMCT) is integrated into the evaluation of decedents in several American medical examiner offices and medicolegal death investigative centers in many other countries. We retrospectively investigated the value of PMCT in a series of firearm homicide cases from a statewide centralized medical examiner’s office that occurred during 2016. Autopsies were performed or supervised by board-certified forensic pathologists who reviewed the PMCT scans prior to autopsy. PMCT scans were re-evaluated by a forensic radiologist blinded to the autopsy findings and scored by body region (head–neck, thoracoabdominal, and extremities). Injury discrepancies were scored using a modified Goldman classification and analyzed with McNemar’s test. We included 60 males and 20 females (median age 31 years, range 3–73). Based on PMCT, 56 (79.1%) cases had injuries relevant to the cause of death in a single body region (24 head–neck region, 32 thoracoabdominal region). Out of these 56 cases, 9 had a missed major diagnosis by PMCT outside that region, including 6 extremity injuries visible during standard external examination. Yet all had evident lethal firearm injury. We showed that PMCT identifies major firearm injuries in homicide victims and excludes injuries related to the cause of death in other regions when a single body region is injured. Although PMCT has a known limited sensitivity for soft tissue and vascular pathology, it can be combined with external examination to potentially reduce or focus dissections in some of these cases depending on the circumstances and medicolegal needs. 相似文献
318.
Adam Lanzarotta Ph.D. Michael D. Thatcher B.S. Lisa M. Lorenz B.S. JaCinta S. Batson M.S. 《Journal of forensic sciences》2020,65(5):1443-1449
A simple, quick, selective, sensitive, and effective field-friendly method capable of being used by nonexperts has been developed for detecting mitragynine in Mitragyna speciosa (kratom) using surface-enhanced Raman spectroscopy (SERS). Over 100 samples and blanks (known to be either positive or negative for the presence of mitragynine) were examined in duplicate using five identical handheld Raman spectrometers, which provided a data set of over 1,000 examinations. Based on the results of these analyses, the method yielded a true-positive rate of 99.3%, a true-negative rate of 97.9%, a false-positive rate of 2.1%, and a false-negative rate of 0.7%. The average minimum detectable concentration (Cm) of mitragynine that reproducibly yielded a match for one of the library spectra on all five instruments was determined to be 342 ng/mL (ppb). This Cm value is a conservative estimate considering that the extraction process was not fully optimized by this study, which was not necessary since the Cm value achieved was well below typical mitragynine concentrations in kratom (1.3–2.3%). The method is ideal (i) for prioritizing samples for additional testing using other more time-consuming laboratory-based techniques needed to detect and quantify mitragynine and (ii) for field use at international mail facility (IMF) satellite laboratories to help interdict kratom and prevent this dangerous product from reaching the U.S. supply chain. 相似文献
319.
Dalia M. Al-Saif M.B.B.S. S.B.F.L.M. Maram A. Al-Farayedhi M.B.B.S. S.B.F.L.M Ghadah A. Al-Shamsi M.B.B.S. S.B.F.L.M. Marwah I. Al-Bayat M.B.B.S. S.B.F.L.M. Osama M. Almadani M.D. Ph.D. F.F.F.L.M. Magdy A. Kharoshah M.B.Bch. M.Sc. M.D F.F.F.L.M. 《Journal of forensic sciences》2020,65(5):1574-1578
Examination of the female external genitalia to assess for sexual abuse is performed in living individuals, and the interpretation of the findings is based on evidence-based studies. However, in the deceased, no such studies are available, and postmortem changes could present as suspicious findings that can be mistaken for trauma. Patches of discoloration in the hymen were reported previously in one case as hypostasis (i.e., livor and lividity), and based on this finding, it was listed as a finding that is not associated with trauma. This was a retrospective study that was conducted in the Center of Forensic and Legal Medicine in Dammam, Saudi Arabia over a 4-year period. The study included 30 deceased women in whom photographic documentation of their external genitalia was assessed for postmortem changes. The postmortem interval ranged from less than 24 h to more than 100 days, and the ages of these deceased women were in the 20–40 year-old age group. In cases where the hymen, vagina, and/or fossa navicularis were clearly visible, none of these areas showed any hypostatic discoloration. A comparison between antemortem and postmortem appearance of the hymen in one case clearly showed the absence of hypostatic changes in the hymen. In conclusion, any discoloration of the external genitalia that is detected in a female decedent requires serious consideration. 相似文献
320.
Virginie Redouté Minzière M.Sc. Denis Werner M.Sc. Daniela Schneider M.Sc. Manuela Manganelli M.S. Balthasar Jung Ph.D. Céline Weyermann Ph.D. Anne-Laure Gassner Ph.D. 《Journal of forensic sciences》2020,65(4):1102-1113
Gunshot residue (GSR) analysis and their interpretation provide crucial information on a criminal investigation involving the use of firearms. To date, several approaches have been proposed for the implementation of a combined sampling and analysis of inorganic (IGSR) and organic GSR (OGSR). However, it is not clear at this stage if concurrent analyses of both types of residue might be detrimental to the analysis of IGSR currently applied in forensic laboratories. Thus, this work aims to compare and evaluate three different protocols for the combined collection and analysis of IGSR and OGSR. These methods, respectively, involve the use of a modified stub (with two halves, one for the detection of IGSR and the other for the analysis of OGSR); the sequential recovery of GSR with two stubs mounted with different adhesives (double-sided carbon tape and Tesa® TACK) and the sequential analysis of IGSR and OGSR from a single carbon stub following carbon deposition. The detection of IGSR was carried out using SEM-EDX, while OGSR analysis was performed using ultra-high-performance liquid chromatography–tandem mass spectrometry (UHPLC-MS/MS). Obtained results for experiments performed using Geco Sinoxid® ammunition indicated that sequential analysis was the most suitable protocol for the combined collection and analysis of both IGSR and OGSR. A higher number of inorganic (characteristic and consistent) particles and higher concentrations of ethylcentralite, N-nitrosodiphenylamine, diphenylamine, and nitroglycerin were recovered with this method. 相似文献