首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   35篇
  免费   3篇
  2019年   1篇
  2018年   3篇
  2017年   1篇
  2016年   2篇
  2015年   2篇
  2013年   8篇
  2012年   2篇
  2011年   1篇
  2009年   3篇
  2008年   1篇
  2007年   2篇
  2005年   1篇
  2002年   3篇
  1999年   1篇
  1997年   3篇
  1996年   2篇
  1994年   1篇
  1992年   1篇
排序方式: 共有38条查询结果,搜索用时 437 毫秒
1.
ABSTRACT. This paper is concerned with the impacts of academic knowledge production (human capital, research, and consultancy) on the investment behavior of the manufacturing industry. Beginning with the neoclassical theory of capital accumulation, a multiregional investment model for non-residential structures and equipment is developed. Within this model, the knowledge impacts of universities are represented by a diffusion function, which takes into account the possibilities of contagious and hierarchical diffusion of knowledge. Special attention has been given to the development of a theoretically sound and empirically operational investment model, and to the identification of spatio-temporal correlation. The latter has been approached by means of the use of an EGLS estimator, based on a stationary spatio-temporal Markov scheme for the residual. The main result of the case study relating to the Netherlands is that academic knowledge production has a significant positive impact on investments in equipment which is strongest in the neighborhood of central places (i.e., following a hierarchical diffusion pattern).  相似文献   
2.
This paper reviews the role of ex ante evaluation methods in Dutch planning practice in the past decades. It is illustrated that the improvement of the evaluation methodology is to a large extent based on a learning process. Many innovations were evoked by criticism and limitations disclosed in practical applications. Since the planning environment as well as the professional skills and attitudes are also constantly changing, this demands a high degree of flexibility of the evaluation methodology. A shift of interest can be witnessed from the quality of the decision towards the quality of decision‐making. It is argued in this paper that in Dutch planning practice currently at least four different situations can be distinguished with respect to the use (or non‐use) of formal ex ante evaluation methods. In planning situations with a hierarchical power structure evaluation methods are regularly used, whereas in situations with a mixed power structure evaluation methods are only used ‘in disguise’ (e.g. hidden in geographical information systems studies, market analysis).  相似文献   
3.
ABSTRACT

This paper will examine settlement location during the Iron Age in the northeast part of the Netherlands, an area shaped by Pleistocene geology. In recent years, a number of Late Iron Age/Early Roman settlements situated on the low lying slopes of sand ridges and nearby stream ridges revealed traces of an earlier Iron Age occupation. Palynological data revealed that this part of the landscape was used by humans before it was transformed into an area of settlement. An analysis of excavation data from two key sites at Denekamp-De Borchert and Groningen-Helpermaar, as well as other known sites, lead to the conclusion that the transformation of ‘peripheral landscapes’ into permanent settlement locations was preceded by a phase of arable cultivation which left no trace of permanent habitation. It is also suggested that the impact of human behaviour on the natural landscape in the Early and Middle Iron Age was much bigger than previously anticipated. When excavating this type of settlement areas dating to the Late Iron Age, archaeologists must be aware that only of a small group of archaeological features exist. The proposed model for the choice of settlement location may be more widespread, because of similarities in landscape between the study area presented here and other landscapes in Northwest-Europe (e.g. parts of Germany and Denmark).  相似文献   
4.
We have applied cluster analysis to mercury intrusion porosimetry data from 219 archaeological bones (121 human and 98 animal) and soil chemistry data from 219 accompanying soil samples (1 per bone sample), to investigate the influence of soil chemistry on bone preservation. The samples chosen for the study were obtained from sites ranging in time from the pre-modern to the Mesolithic and were representative of burial environments across Europe (from the Baltic to the Mediterranean). These results represent the single largest database for archaeological bone preservation in the European Holocene to date and demonstrate the potential for large-scale diagenetic studies to help develop long term preservation strategies for our European heritage. Despite the variety of sites and environments, bones could be categorised into only four main diagenetic types. Furthermore, soil chemistry appears to significantly affect only one type of preservation, the pathway characterised by loss of mineral. In neutral to basic soils, taphonomy and in particular the differences between the treatment of human and animal remains, becomes the dominating factor in determining preservation. Using these results, strategies for heritage management of archaeological sites can be suggested; grouping sites into those requiring immediate excavation and those where in situ preservation is viable.  相似文献   
5.
Teeth are often the preferred source material for isotopic and genetic assay involving ancient biomolecules. The assumption is that dental tissue preserves better due to its anatomically protected location, the enamel cap, and lower porosity compared to bone. However, this assumption has not been widely tested. Some similarities in diagenetic processes are to be expected due to similarities in structure and chemical composition of dentine and bone. This has led to the suggestion that bone can be used as an indicator of dental preservation, as a pre‐screening technique in the selection of suitable samples for biomolecular studies. Thus, direct testing of the correlation between bone and tooth preservation and diagenesis is needed. This paper reports the results of the histological characterization of diagenetic alterations within 25 human femur–tooth pairs, from a Medieval to modern (AD 1850) cemetery in Eindhoven, the Netherlands. The results showed that teeth do indeed preserve better overall, but not always, and that this was dependent on the main diagenetic factor(s) at the burial location. Furthermore, good correlations are found between the microstructural preservation of bone and teeth; similar processes of decay were observed within bone and teeth of the same individual. Overall, the study demonstrated that histological analysis of bone is useful for the identification of degradation processes that affect biomolecular preservation in skeletal material. In this way, sample selection and analytical strategies can be optimized. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   
6.
Abstract: Within the European Union, an internal liberalisation of cross‐border labour mobility for EU citizens is currently being combined with the tightening of control and management efforts at the external borders. At the same time, attempts are being made to strategically select immigrants from new member states as well as from outside the EU who will be of economic value. In this paper we argue that by implementing such protectionist and selective immigration policy, the EU has come to resemble a gated community in which the bio‐political control and management of immigration is, to a large extent, the product of fear. Often fear manifests itself in terms of fear of losing material gain, eg the anxiety of losing economic welfare or public security. More often, however, this fear relates to the entrance of the immigrant, the stranger and is, as such, associated with a fear of losing a community's self‐defined identity. These perceived threats to a community's comfort lead to the politicisation of protection, whereby the terra incognita beyond the border is justifiably neglected due to the indifference and the intentional blindness shown to the outside. Hiding in a gated community in order to protect this comfort zone and trying to exclude outsiders, ‘Others’, from the community, is not only in vain since the desire for completion of the Self can never be fulfilled, but what remains still more troublesome, is that this tendency will sustain and reproduce global inequality and segregation, both in the material as well as symbolic sense.  相似文献   
7.
This article considers two intimately related claims about Mediterranean port cities. First, that their citizens felt more affinity with each other than they did with the inhabitants of non‐port cities. And second that they were the scenes of liberal cosmopolitanism during the late nineteenth and early twentieth centuries. It discusses the concept of “cosmopolitanism”, and briefly reviews the case of Izmir as an exemplar and compares it to the cities of Alexandria and Trieste. The article argues for a more careful and differential use of the notion of “cosmopolitanism”, and suggests questions for further anthropological and historical research.  相似文献   
8.
9.
10.
Computed tomography (CT) and traditional techniques were used to study the internal morphology of modern fruits of Pleiogynium timoriense (DC.) Leenh., and phosphatized and silicified fruits that were considered to belong to the genus. The results demonstrate that phosphatized fruits from the Oligocene–Miocene Dunsinane site at Riversleigh and silicified fruits from the Oligocene Glencoe Site, which are both in Queensland, are referable to Pleiogynium. The Riversleigh material (Pleiogynium wannanii Rozefelds, Dettmann & Clifford sp. nov.) is very similar to extant P. timoriense (DC.) Leenh. Both possess locules that, in the vertical axial plane, are asymmetrically reniform and enclosed by a two-layered endocarp, the inner layer woody and resistant to decay, the outer of fibres and parenchyma, surrounded by a mesocarp of fibres and sclereids and a parenchymatous exocarp. The outer mesocarp is sculpted by meridionally arranged, elongate depressions (germination apertures) situated at the dorsal surface of each locule; erosion of the mesocarp and outer endocarp provides passage for emergence of the embryo’s radicle on germination. The silicified material from Glencoe (P. parvum Rozefelds, Dettmann & Clifford sp. nov.) is smaller in all its parts and has locules that are ovate in the vertical axial plane. Discrete, cap-like, opercula are not evident in the fruit wall of the fossil and extant fruits studied. The presence of Pleiogynium, and associated taxa, indicates the existence of rainforest communities at Glencoe, and mixed open forest/rainforest at Riversleigh during Oligocene–Miocene times. The multilocular, fossil fruit described as Pleiogynium mitchellii Collinson, Manchester and Wilde from the Eocene deposits at Messel Quarry, Germany, is not considered to belong in the genus, as evidence of elongate depressions on the dorsal surface of the fruit stones has not been demonstrated conclusively, and its internal morphology/anatomy differs significantly from that of Pleiogynium.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号