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991.
992.
The field of dynamic capabilities has developed very rapidly over the last ten years. In this paper we discuss the evolution of the concept, and identify two major current debates around the nature of dynamic capabilities and their consequences. We then review recent progress as background to identifying the contributions of the seven papers in this special issue, and discuss the relative merits of qualitative and quantitative studies for investigating dynamic capabilities. We conclude with recommendations for future research arguing for more longitudinal studies which can examine the processes of dynamic abilities over time, and for studies in diverse industries and national contexts.  相似文献   
993.
Sociological literature lacks a firm evidentiary base with respect to how mass media usage works to forge patterns of collective attachment among socially diverse individuals within contemporary societies. This paper seeks to engage with this absence by examining the detailed ways in which complexities of media consumptions are linked with divergent popular visions of national belongingness and identity. Focusing in particular on variations in cultural genre and delivery technology, the study aims to help clarify extant disciplinary discussions about if and how media consumption interconnects with the substance of individual national imaginings in an era of cultural globalization. Using data from a large social survey of changing visions of national identity among contemporary Australians, the study shows that established media technologies and the consumption of lowbrow genres harden individual attachment to a traditional imagining of the nation. By contrast use of the Internet and highbrow genres foster a more inclusive vision of nation identity. In terms of sustaining these different national identity configurations, cultural genre is revealed to be of greater consequence than technological medium. Furthermore, and in a more general way, the findings suggest that notwithstanding the complexity of effects, mass media usage stands up alongside a more established concern with individual social structural background as a highly salient factor in shaping contemporary formations of national attachment.  相似文献   
994.
A serious barrier to our understanding of urban ecosystems is a lack of information on the ecology of soils organisms of green spaces within large cities. This study addresses this gap by providing baseline survey data on the biodiversity of soil macrofauna in urban parks and domestic gardens of London, UK. In April and June 2004, the soil macrofauna were handsorted from soil cores in eleven parks and gardens of various sizes in central London. Five taxa were identified to species (Lumbricidae, Isopoda, Diplopoda, Chilopoda and Formicidae). The biodiversity value of the two main habitats (horticultural borders and mown grass lawns) was assessed and the influence of a range of environmental factors on species density (number of species per unit area) examined. The species densities of the studied soil invertebrates in the urban gardens were comparable with those found in natural ecosystems, although plant borders contained significantly more species than lawns. Borders had higher levels of plant nutrients, higher floristic diversity and lower levels of micronutrients and heavy metals than lawns. Significant predictor variables of species densities in the plant borders were the percentage of leaf litter cover, sampling month and soil pH. Species densities in the lawns were significantly correlated with the distance of the samples from the edge of the lawn.  相似文献   
995.
996.
During the 1980s, with the growth in divorce, remarriage and births outside marriage, men's responsibilities for children and their mothers have been reviewed. In Great Britain, the Child Support Act 1991, following a decade in which the number of lone parents increased by 50 per cent and the proportion claiming state benefit increased from one-half to two-thirds, is attempting to shift lone mothers from dependence on the State to dependence on the biological father of their children. This has raised controversial issues concerning women's and children's claims on the State as citizens in their own rights; the balance between a man's private duty to maintain and provide care for children (by maintaining their mother) and his public duty to reimburse the State for doing so; and the legitimacy of trade-offs between claims on family "property" and claims to maintenance previously exercised in the courts. The individualistic system of English family law, in contrast to the law in Scotland and continental Europe, is part of the context within which these changes are taking place. So, too, is the fall in economic activity rates of lone mothers, which are among the lowest in the European Union.  相似文献   
997.
North Atlantic NGOs have significantly increased their role in international development. They have expanded their activities beyond relief to include a more structural approach to third-world poverty and have attracted increasing amounts of government subsidies for their work overseas. They have also begun to engage in education of their home populations about global poverty and have established close ties to an emerging network of third-world NGOs who channel their resources to the grassroots poor abroad. In the post-Cold War era, North Atlantic NGOs enjoy some unique opportunities to expand their work due to the increase of third-world democracy and free-market economies, but they also face some critical challenges ahead — balancing periodic relief efforts with long-term development programmes, resisting pressures by governments to use NGOs for their own purposes, upgrading the quality of development education at home, and finding ways to relate to third-world NGOs as more equal partners. These and other challenges (for example, improving institutional capacities of North Atlantic NGOs to handle increasing demands, and relationship between third-world NGOs and grassroots organisations) need the attention of scholars in the years ahead.An earlier version of this paper was presented to the Quarterly Meeting of the Advisory Committee on Voluntary Foreign Aid (ACVFA) of the United States Agency for International Development (USAID) at the United States Department of State, Washington, DC, 15 September 1992.  相似文献   
998.
There is but a single source of widely-accepted estimates of charitable giving in the United States, and that isGiving USA, an annual publication of the AAFRC Trust for Philanthropy. This paper examines the validity of those estimates and raises questions that imply a need for further research in this area.Despite the improvements in the quality of the estimates over the years, there remain conceptual, empirical and procedural problems of which all users of the numbers should be aware. The conceptual problems are largely a matter of definition, and it is argued that grants by private foundations should be excluded from the total because foundations themselves are charitable recipients of funds from the rest of society and their inclusion results in double-counting. The empirical problems arise from defects in much of the data from the tax files that are used as sources of information for making the final estimates; some of those defects are spelled out in detail. The procedural problems stem from the lack of comprehensive information about the amounts of charitable giving from individual donors; in making its estimates,Giving USA relies primarily on an econometric equation, some of the variables in which are questionable.  相似文献   
999.
In 1991 a random sample of former clients of a metropolitan counseling center were surveyed as to their perceptions of the effect on therapy of 21 forms of social or physical contact between client and counselor. This article reports the results of a follow-up study conducted in 1992 in which the professional counseling staff of the same center were surveyed as to their perceptions of the effect on therapy of the same 21 types of contact. The results of both studies are compared, and statistically significant differences in evaluation of the behaviors by the two groups are noted.  相似文献   
1000.
Chikuse's (1987) algorithm constructs top-order invariant polynomials with multiple matrix arguments. Underlying it is a set of simultaneous equations for which all integer solutions must be found. Each solution represents a component of the sum of terms which comprise the polynomial. The system of equations has a specialised structure which may be exploited to obtain a polynomial with r matrix arguments in terms of a polynomial with r-1 matrix arguments. This is demonstrated for two particular polynomials that have two matrix arguments. These results are applied to problems involving expectations of ratios of quadratic forme in normal variables; analytic as well as computable formulae are derived.  相似文献   
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