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Over the past decades, economic and innovation policy across Europe moved in the direction of creating regional clusters of related firms and institutions. Creating clusters through public policy is risky, complex and costly, however. Moreover, it is not necessary to rely on clusters to stimulate innovation. A differentiated and combined network approach to enhancing innovation and stimulating economic growth may be more efficient and effective, especially though not exclusively in regions lacking clusters. The challenge of such a policy is to mitigate the bottlenecks associated with “global pipeline”, “local buzz” and “stand alone” strategies used by innovative firms and to combine these strategies with a view to their complementarity in terms of knowledge effects. Private and semi-public brokers will be key in the evolving policy, as timely organizational change is crucial for continued innovation, while brokers also need to mitigate governance problems. This requires region-specific knowledge in terms of sectors, life cycles, institutional and socio-cultural factors, and yields spatially differentiated and differentiating adjustment strategies. The role of public policy is to assist in recruiting, provide start-up funding and monitor brokers. With this, policy moves towards a decentralized, process-based, region-specific, spatially diverging and multi-level system of innovation that is geared towards the evolving innovation strategies of firms.  相似文献   
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Given the usual neoclassical assumptions of economic rationality, perfect competition, long-term spatial equilibrium, a Thunian context, and perfectly divisible labor and capital, this paper expresses economies of scale in farming in terms of the yield derived from a given level of intensity. If yield increases as farm scale increases, there are economies of scale. If yield decreases, there are diseconomies of scale. The literature on scale economies in agriculture suggests that scale economies accrue from increases in capital inputs, but diseconomies occur as a result of increases in farm area. The models of the spatial structure of agriculture, with farm size included, show the following: 1. Unless there are economies of scale giving way to diseconomies of scale with increases in farm size, no optimal farm area or farm scale can be defined; 2. If the optimal intensity for farming does not vary over space, the optimal farm scale or area should be constant over space; 3. If intensity varies spatially, and if the optimal economies of scale are a function of area only, farm areas should not vary spatially, and sales volume per farm should increase as market access and fertility increase; 4. It is only if intensity varies spatially and optimal scale economies are a function of both area and total quantities of nonland inputs per farm that farm area should increase as distance to market increases or fertility decreases. In this last case, quantities of nonland inputs per farm should also decrease, and usually sales volume per farm should decrease also.  相似文献   
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R. M. Visser 《Archaeometry》2021,63(1):204-215
The Gleichläufigkeitskoeffizient (GLK), or the percentage of parallel variation (%PV), is an often used non‐parametric similarity measure in dendrochronological research. However, when analysing big data sets using the GLK, this measure has some issues. The main problem is that it includes not only synchronous but also semi‐synchronous growth changes. These are years in which the growth in one of the compared series does not change in two subsequent years. This influences the GLK, often only slightly, but the larger the data set the stronger the effect. The similarity between tree‐ring series can be more objectively expressed by replacing the GLK with the synchronous (SGC) and semi‐synchronous growth changes (SSGC). The calculation is similar, since GLK = SGC + SSGC/2. Large values of the SSGC are indicative of possible anomalies or even errors. The SGC is much better suited than the GLK to describe similarity. The SGC should therefore be used to analyse big data sets, for clustering and/or dendroprovenance studies. It is recommended to combine the SGC with parametric measures.  相似文献   
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This paper deals with the constraints and risks of learning in different types of spatial concentration of related industries and firms. We aim at a better understanding of what makes the difference between local lock-in on the one hand and ongoing creation of novelty on the other. To achieve this purpose, we use Nonaka and Takeuchi's (1995) treatment of knowledge conversion processes and Nooteboom's (2000) cycle of discovery. Hence, we are able to clarify the concept and nature of learning, which in turn provides a basis for specifying different learning effects of two prototypes of spatial concentration: Marshallian and dynamic industrial districts. We show that these two types of industrial districts have multiple, different, and complementary functions in terms of knowledge conversion and knowledge creation. Hence, we can explain why spatial concentration can have positive and negative effects for learning and innovation, and how lock-in can be avoided.  相似文献   
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Integration into global production networks poses significant challenges, and also opens up opportunities, for labour agency. Governance by lead firms affects working conditions and can drive precarious employment; this interacts with and can constrain national labour legislation covering labour rights. The global production networks (GPN) approach facilitates examination of commercial value chains, their interaction with institutionally and societally embedded labour markets, and potential leverage points for labour contestation transcending local, national and global scales. This informs analysis of commercial/societal articulations as contested processes opening space for multi‐scalar labour agency within global production networks. This article examines how tensions between global commercial and societally embedded dimensions of global production networks drive precarious work, and seeks to understand the implications for emergent forms of multi‐scalar community‐based labour agency. These questions are explored through an examination of labour casualization and contestation in South African fruit production in 2012–13, using the GPN approach. The authors find that multi‐scalar channels of labour agency leveraging both global commercial and government actors can enable reworking by unorganized community‐based labour to bargain for better pay and conditions, but if the underlying global commercial logic is to be challenged, more systemic strategies are required.  相似文献   
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This article outlines the preliminary results of archaeological fieldwork at the crash site of RAF Halifax bomber LV881-ZA-V and explores some of the challenges presented by the excavation of this military wartime crash site. The aircraft and her crew were shot down by a German night fighter in the early hours of 31 March 1944 during the infamous Nuremberg Raid. Four of her crew were killed and the remaining three were taken prisoner and later took part in the ‘Long March’. All three survived the war. An international team comprised of staff and students from Germany, the Netherlands, Finland and the UK explored what remained of the crash site, located on a hill outside the village of Steinheim, north east of Frankfurt in the German Federal State of Hesse.  相似文献   
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In the Netherlands, as in most other western European countries, the desirability and the governability of a multicultural society are topics of debate. In the last decade, this debate has increasingly centred on second-generation migrants, focusing on their high rates of crime and school drop-out. In the Dutch context, however, little scholarly research has paid attention to second-generation migrants’ own experiences. In this paper, I therefore focus on the perceptions of ethnic boundaries held by 12- to 19-year-old second-generation migrants and how they negotiate these boundaries in the low-income, multi-ethnic Feijenoord area of Rotterdam. The study shows that young people are used to living together with many different cultures and see themselves as being on both sides of the ethnic boundary between the Dutch-majority society and the culture of their parents. However, they also encounter prejudice and discrimination in their day-to-day lives, which calls into question the success of multiculturalism.  相似文献   
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This article explores how Ghanaian migrants in the Netherlands enhance their gendered social well-being. We provide an in-depth view of gender-specific places and relations that shape the social well-being of migrants, focusing on place-based lived experiences, by conducting in-depth interviews and observations. Our results demonstrate that social well-being is enhanced by social networks, wherein the participants recreate feelings of self-esteem, belonging and recognition. Furthermore, the special meaning of food and faith also contributes to the social well-being of the participants. Food and faith serve as commemorations of traditions in their home country and alleviate the transition to new traditions in the host country. We also found that specific places, such as shops and churches, contribute to the social well-being of participants in the study. Men and women in our study use different strategies to construct their well-being, and they interpret places and social relations differently, but they all showed to be active agents in enhancing their social well-being. Our female participants in particular look for opportunities in the host country to independently enhance their social well-being, for instance through establishing their own small businesses and social groups. Through its focus on the social well-being of migrants, the study contributes to increase understanding between different cultural groups.  相似文献   
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