This article introduces the themes of a virtual special issue (VSI) of Environmental Education Research (http://explore.tandfonline.com/content/ed/ceer-vsi) focused on policy research in environmental and sustainability education (ESE). The broad purpose behind preparing the VSI was to consider the challenges involved in linking particular concepts of environment and sustainability with key themes in educational policy, and how this remains a heavily contested practice. Examples drawn from two decades of studies published in the journal show how these might be illustrated, addressed, problematized and possibly transcended. The introduction traces how ESE researchers have dealt with key trends, complexities and issues in the policy-practice-research nexus both conceptually and empirically. It also illustrates how researchers within the field might reimagine and reinvigorate policy research on ESE, and how working with researchers from other fields who offer different perspectives, ideas and expertise might aid the cross-fertilisation of a complex terrain of ideas, policy and practice. In so doing, we hope the accompanying VSI inspires renewed interest into the (at times, fickle) relationship between ESE, and the dual worlds of possibility and tension that take place both within, and surrounding, their fields of policy and research. 相似文献
Purpose: This study evaluates the impact of an outsourced extension service delivered by Lima Rural Development Foundation (Lima) in the Umzimkhulu district of South Africa. The evaluation is conducted at both the household and program levels.
Design/methodology/approach: Household impacts were estimated using two-stage regression with instrumental variables to account for selection bias. Gains in household income were extrapolated to estimate the net incremental benefit of the program and its financial return at district level. These analyses were underpinned by a rigorous sampling design.
Findings: The results show that the outsourced extension service made a significant and substantial contribution to household crop income and net income. In addition, clients perceived a range of socio-economic benefits such as better diets, improved product quality, and job creation. Analysis of the financial cost and benefit of the extension service at district level suggests an annual net incremental benefit of R5 million (US$0.4 million), and a 95% probability that returns to the service exceeded 20% in 2012/2013.
Practical implications: These results suggest that there is good reason for donors to continue funding effective extension services to small farmers in areas of high agricultural potential.
Theoretical implications: This is an empirical study. It uses well-established methods to measure the impact but introduces a local economy multiplier to capture some of the indirect effects of agricultural extension.
Originality/value: This research is valuable as very few studies worldwide have evaluated the impact of agricultural extension services at both the farm and program levels. 相似文献
The authors analyzed the implications of targeted advertising on the equilibrium level of channel profile differentiation (e.g., in terms of political positioning), in free-to-air broadcasting industries. When consumers have no preferences over program content (e.g., entertainment vs. news) standard Hotelling type results apply. Market forces minimize differentiation while the optimal degree is at an intermediate level. As preferences over program content get somewhat stronger, the difference between optimal and market outcomes is initially reduced. However, when preferences over program content get more pronounced, minimal differentiation suddenly becomes optimal while market forces lead to excessive differentiation. Hence, policies aimed at increasing diversity are beneficial only when viewers care little about differences in program content. 相似文献
In media markets, the value of advertisement exposure depends on circulation, and media consumers' valuation is affected by advertising. This article analyzes media market competition in a duopoly framework. There exist symmetric and asymmetric equilibria in terms of firm size, and sometimes a natural monopoly may emerge. There is less scope for asymmetry when products are more differentiated. Some media exhibit public good features. This increases the scope for asymmetry when consumers value advertising positively. If their valuation is negative, only symmetric equilibria exist. Regulations limiting price competition increase the scope for natural monopoly. 相似文献
We show some limitations of the ROUGE evaluation method for automatic summarization. We present a method for automatic summarization based on a Markov model of the source text. By a simple greedy word selection strategy, summaries with high ROUGE-scores are generated. These summaries would however not be considered good by human readers. The method can be adapted to trick different settings of the ROUGEeval package. 相似文献
The UK National Student Survey (NSS) has high status on the agenda of UK universities. Its rise in status is linked to its influence on national rankings and associated funding streams referenced to the Teaching Excellence Framework (TEF). Consequently, many universities have implemented further assessments of student satisfaction, thereby putting additional internal performative pressures on courses and individual lecturers. The research contribution of this article comprises an analysis of the NSS through Foucault's notion of ‘governmentality’, with a particular focus on his work on ‘discipline’ and ‘neo-liberal governmentality’. More specifically, by utilising qualitative data from interviews, research diaries and observations, it will be demonstrated how the NSS functions as a ‘disciplinary’ technology of government which subjects lecturers, departments and universities to intersecting panoptic gazes and perpetual ratings. In addition, the NSS can also be considered ‘neo-liberal’ in that it governs the academic population through narrow conceptions of ‘freedom’ and omnipresent competition. The article proposes that it is through the amalgamated forces of intersecting panoptic gazes, on the one hand, and neo-liberal free-market principles, on the other, that student feedback develops its power to govern. 相似文献
