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The presence of heterogeneity in treatment effects can create problems for researchers employing a narrow experimental pool in their research. In particular it is often questioned whether the results of a particular experiment can be extrapolated outside the specific location of the study. In this article, we use a population-based field experiment in order to test the extent to which treatment effects for impersonal mobilisation techniques (direct mail and telephone) are sensitive to where they are carried out (geography) and the context of the election in which they were conducted. We find that on the whole it does not much matter where an experiment is conducted: the treatment effects are to all intents and purposes geographically uniform. This has important implications for the external validity of get-out-the-vote field studies more generally, especially where single locations are used. However, there is one important exception to this: experiments carried out in high turnout locations at high salience elections may show larger effects than those carried out in low turnout areas. 相似文献
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Fieldhouse SJ 《Journal of forensic sciences》2011,56(6):1514-1520
Abstract: Few techniques offer “in situ” methods of friction ridge skin mark development. “In situ” development reduces mark transportation, degradation, and often cost. The effectiveness of cyanoacrylate fuming using the SUPERfume® and dusting with aluminum powder for latent fingermark development on several nonporous surfaces, stored in various temperature environments for time periods up to 52 weeks, was investigated. Five thousand and four hundred latent fingermarks were deposited under controlled conditions and graded. The results suggested that cyanoacrylate fuming (SUPERfume®, Foster and Freeman, U.K.) was more effective at developing latent fingermarks on textured and smooth plastic surfaces and for marks stored in temperatures of 37°C, whereas aluminum powder was more effective on glass, enameled metal paint, and varnished wood, and for storage temperatures below 20°C. There were no significant benefits to using either technique for marks older than 24 h, but it was possible to develop fingermarks following 52 weeks of storage using both techniques. 相似文献
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Toward a stakeholder-based policy process: An application of the social marketing perspective to environmental policy development 总被引:1,自引:0,他引:1
This article suggests that the application of social marketing principles to the public policy process can facilitate the efforts of governmental policy-makers and non-governmental stakeholders to articulate their policy desires and to encourage the adoption and acceptance of particular environmental policies. A conceptual framework is presented, emphasizing both the influence of stakeholders on environmental policy development and the education of stakeholders as to the potential effects of the policy. The purpose of such a conceptualization is to show how social marketing principles can be applied to the public policy process in order to enhance the likelihood of successful policy development and implementation. 相似文献
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Ed Gareth Poole 《Regional & Federal Studies》2019,29(4):507-529
Although mixed-member electoral systems offer an apparent opportunity to observe how different rules shape politicians’ behaviour, ‘contamination’ between the SMD and PR-list tiers has frequently confounded academic work. Investigating Scotland and Wales’ mixed-member legislatures by exploiting their different chamber sizes and an unusual dual candidacy prohibition in Wales, modelling of committee assignments uncovers a split finding. Controlling for membership of the lead governing party, list members have a higher committee workload than their constituency colleagues, and members with previous employment experience in justice and health are more likely to be assigned to the corresponding subject committee once elected. Elsewhere, expectations that members might seek assignments that best suit theorized re-election interests are not found. The hypothesized influence of electoral rules is strongly conditioned by the small size of the legislature in Wales. 相似文献
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An Investigation into the Effects of Force Applied During Deposition on Latent Fingermarks and Inked Fingerprints Using a Variable Force Fingerprint Sampler 下载免费PDF全文
Sarah J. Fieldhouse Ph.D. 《Journal of forensic sciences》2015,60(2):422-427
Physical factors, including the magnitude of the force applied during fingermark deposition, may affect friction ridge surface area and clarity, and the quantity of residue transferred. Consistency between fingermarks may be required; for example, in research projects, yet differences between marks are likely to exist when physical factors are not controlled. Inked fingerprints and latent fingermarks were deposited at 1–10 N at 1 N increments using a variable force fingerprint sampler to control the force, angle of friction ridge and surface contact, and the duration of friction ridge and surface contact. Statistically significant differences existed between the length and width measurements of the inked prints (p ≤ 0.05), particularly at lower forces. Scanning electron microscopy and surface plot analysis demonstrated how differences in force applied during deposition affected ridge surface area, displacement of latent residue, and differences in the quantity of residue transferred. Consistency between inked prints was demonstrated at equivalent forces. 相似文献
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