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21.
This study presents a test of intra- and inter-observer measurement error rates of the intercondylar shelf angle of the distal femur, as measured on lateral radiographs. This measurement is the central element of a method to determine racial affiliation from the distal femur. Four observers independently radiographed a set of 33 complete and partial femora from collections housed at the Joint POW/MIA Accounting Command, Central Identification Laboratory. Each observer then measured the intercondylar shelf angles in each radiograph, following the original method's guidelines. A supplementary inter-observer error test was conducted by four additional observers on one set of radiographs. Statistically significant differences were found for both intra- and inter-observer error based on the results of Student's t-tests, paired samples t-tests, and ANOVA analyses. The results of this study indicate that further experimentation should be undertaken in order to develop refined measurement techniques that may help improve standardization and reduce the observer error rates. 相似文献
22.
Tracy E Waasdorp Juliette Berg Katrina J Debnam Elizabeth A Stuart Catherine P Bradshaw 《Journal of school violence》2018,17(3):381-391
Parochial schools are assumed to provide better social and academic experiences; however, few studies account for selection bias when comparing with public schools. This study contrasted public versus parochial schools using propensity score matching across a range of outcomes (e.g., perceptions of school, emotional symptoms, substance use, bullying). Using a sample of 58 public and 5 parochial high schools, the nonmatched analyses suggested a significant advantage for parochial schools students (e.g., better on 23 of 32 indicators). However, the propensity score matched analyses revealed nine differences (e.g., weapon carrying, smoking), two of which (i.e., stress and cyberbullying) favored public schools. While at first glance parochial schools generally appear to be healthier and safer learning environments, accounting for selection bias, the gap was narrowed. Students in parochial schools may struggle with issues related to social, emotional, and behavioral health risk, and thus prevention programs should also be implemented in these settings. 相似文献
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Kristian Berg Harpviken Ananda S Millard Kjell Erling Kjellman Bernt A Ska˚ra 《Third world quarterly》2013,34(5):889-908
The ability to assess the impact of humanitarian interventions is key both for priority-setting and for maximising the quality of projects. Humanitarian mine action (hma) is a young sector, where the application of impact assessment is still in its infancy. In this article we will briefly revisit the history of impact assessment in hma, before reviewing the strengths and weaknesses of three different impact-assessment approaches: 1) the Landmine Impact Survey; 2) economic analysis; and 3) community studies. Each of the approaches has its own merits as well as its own shortcomings and the selection of one approach, or several approaches combined, needs to be informed by the particular conditions in a given setting. We argue that hma should always be based on sound impact-assessment practices, but also that it is important to encourage a general understanding of broader impact issues—as opposed to narrow output definitions—among all relevant stakeholders. In spite of considerable progress over the past few years on this issue, impact in mine action is still largely perceived as an event rather than an integral part of the process and specialised units responsible for impact assessment isolate this activity from day-to-day field management. 相似文献
26.
Richard B. Felson Jukka Savolainen Mark T. Berg Noora Ellonen 《Journal of Quantitative Criminology》2013,29(2):273-293
Objectives
Using data from a nationally representative survey of adolescents in Finland this research examined the influence of spending time in public settings on the risk of physical assault and robbery victimization.Methods
Binary and multinomial regression models were estimated to disaggregate associations between hours spent in public settings and characteristics of the victimization incident. The amount of causality/spuriousness in the association was examined using a method of situational decomposition.Results
Our findings indicate that: (1) an active night life (any time after 6 pm) has a strong effect on victimization for boys, whereas much of the association between night life and victimization is spurious for girls; (2) after-school activity is not a risk factor; (3) adolescents who frequent public places at night increase their risk of victimization by people they know as well as strangers; and (4) much of the risk of night time activity in public settings is alcohol-related.Conclusions
Our research suggests that a good deal of the risk associated with spending time in public settings is a function of the victim’s own risky behavior rather than inadvertent physical contact with motivated offenders in the absence of capable guardians. In addition, this lifestyle is significantly more victimogenic for males. 相似文献27.
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Identification particles used for the purpose of the post-blast identification of explosives have a coding system based on the combination of metal oxides and their various concentrations. These materials are composed of the polymeric matrix, iron powder (ferromagnetic properties), UV light active dyestuff and various metal oxides in a various ratios. A suitable analytical method has to be used for an accurate characterization of these metal components in the particles in order to find the required information, i.e. to determine the place and the year of production and as the case may be, also the production batch of misused explosives. In this work, the method of microwave digestion and flame atomic absorption spectrometry (F-AAS) was developed for an accurate determination of Zn, Mg, Cu and Pb in a few novel types of identification particles and applied to their characterization. When using specific sample treatment (digestion with a mixture of nitric acid with hydrochloric or hydrofluoric acid), the 3 sigma limits of detection (LODs) for the determination of Zn, Mg, Cu and Pb in 5mg original samples were 1.9, 0.2, 1.3 and 2.4 mg g(-1), respectively. The signal suppression due to the presence of HNO3+HCl or HNO3+HF was observed for Zn; therefore, the calibration solutions had to be prepared exactly with the same acids as those used for the sample mineralization. The determination of Mg, Cu and Pb was free of interferences; hence a simple calibration curve method could be adopted for attaining accurate results. The accuracy was checked by comparison of the results with those obtained by means of independent inductively coupled plasma optical emission spectrometry (ICP-OES). Good precision values, as relative standard deviation, in the range of 1-5% were obtained. A total number of 71 samples was analysed and classified by multivariate methods to prove the suitability of the procedure proposed for the purpose of the identification of explosives. 相似文献
29.
Brain death is usually not confirmed by neurological and angiographical techniques until long after it has actually taken place. In connection with a case in which expert testimony was heard, clinical and radiographic evidence and the autopsy statement are discussed as criteria of continuing development of brain edema; on the basis of the evidence it was possible to conclude that the cerebral circulation had not yet ceased at the time assumed. 相似文献
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