全文获取类型
收费全文 | 1446篇 |
免费 | 66篇 |
出版年
2023年 | 8篇 |
2020年 | 14篇 |
2019年 | 25篇 |
2018年 | 44篇 |
2017年 | 30篇 |
2016年 | 44篇 |
2015年 | 35篇 |
2014年 | 35篇 |
2013年 | 459篇 |
2012年 | 64篇 |
2011年 | 59篇 |
2010年 | 53篇 |
2009年 | 57篇 |
2008年 | 27篇 |
2007年 | 47篇 |
2006年 | 55篇 |
2005年 | 18篇 |
2004年 | 24篇 |
2003年 | 22篇 |
2002年 | 20篇 |
2001年 | 25篇 |
2000年 | 18篇 |
1999年 | 11篇 |
1998年 | 15篇 |
1997年 | 8篇 |
1996年 | 13篇 |
1995年 | 16篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 10篇 |
1989年 | 11篇 |
1988年 | 9篇 |
1987年 | 7篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 9篇 |
1983年 | 13篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1980年 | 14篇 |
1979年 | 12篇 |
1978年 | 9篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1974年 | 12篇 |
1972年 | 6篇 |
1971年 | 8篇 |
1968年 | 10篇 |
1967年 | 6篇 |
1966年 | 7篇 |
排序方式: 共有1512条查询结果,搜索用时 31 毫秒
11.
Sutton and Lawless review a selection of the prolific literature on the Maghreb's human geography published from the late 1970s onward. The pedigree of the discipline in Maghreb was established by several notable geographers who lived, researched, and wrote there. Augustin Bernard's writings on rural settlement, his atlas, and study of Algeria are still cited. Jean Despois's regional study with Raynal and his work on Tunisia, together with the detailed rural research of Jean Poncet, provides a particularly rich coverage for that country. Jean Dresch's early work on Morocco exemplified an early critique of the contemporaneous uncritical colonial human geography. The Sahara's fascination also inspired pioneering studies by Robert Capot-Rey. The work of these notables and others provided a solid background of geographical literature on the Maghreb to be supplemented, criticized, and challenged by more recent researchers, sometimes pupils of the above individuals, and increasingly North African by birth. The tradition of general texts on the Maghreb has continued, though increasingly with systematic approaches replacing regional appraisals. The geography of the decolonization of the Maghreb by Isnard has been replaced by a study summarizing recent collaborative work by a team of French geographers. The Saharan extensions of the Maghreb states have often been linked in general works, sometimes being juxtaposed against the Maghreb as in the essays offered to Jean Despois. Lawless and Findlay's collaborative study juxtaposes geographical studies of each country's economic development with political scientists' evaluations of their sociopolitical development. This review limits itself largely to geographers and geographical journals, only occasionally including significant works from other subject areas, and to 1977-1978 publications, with a few notable exceptions. The spatial juxtaposition of contrasting approaches to economic development, liberal market economy approaches by Tunisia and Morocco arguably leading to dependency, and centrally-planned strategies by Algeria and Libya resulting in bureaucratic constraints serves to offer the Maghreb as a pertinent case-study region for the applied geographer of developing countries. 相似文献
12.
13.
14.
15.
R. I. WOLFE 《The Canadian geographer》1966,10(1):1-14
Cet article est le texte d'une adresse presenté au Premier Seminaire international relatif à l'ekistique et à l'avenir des établissements Humains, tenu à Athènes, juillet 1965. Le tourisme est l'une des trois migrations caractéristiques de notre époque (les deux autres étant la migration de la campagne à la ville et celle du domicile au lieu de travail). Les restrictions sur le tourisme sont devenues progressivement moins impérieuses; continueront-elles dans ce sens, ou vont-elles s'imposer de nouveau? Sous plusieurs aspects, le tourisme se développe à un rythme qui atteint 25 pour cent par an. Ceci ne peut pas continuer, et ne devrait pas, puisque éventuellement l'accroisement de tourisme de masse doit avoir pour résultat une diminution du plaisir collectif. Ce phénomène se produit déjà avec l'automobile en particulier, maintenant que les nombres des voitures en circulation dans les autres parties du monde approchent de la densité existente en Amérique du Nord. Il est probable que la même déteriotation se produira pour les voyages outre-mer, que se font en majeure partie par avion. Pour les pays sous-developpés, le tourisme extérieur peut apporter des immenses bénéfices, comme le prouve l'exemple de l'Espagne. Mais, ces pays sont en fait exporteurs d'une resource naturelle—la beauté de leurs paysages—qui peut-être ne leur sera plus disponible quand ils auront en fin les moyens d'y prendre plaisir eux-même. Si, comme croit C. A. Doxiadis, le monde devient une immense ville—Ecumenopolis—les problèmes de tourisme pourront bien devenir insurmontables. En tout cas, si l'homogenéité du milieu urban continue à s'accroître, est-ce que les gens manifesteront la volonté de visiter un Paris, un Londres, un Peking, qui ont tous le même aspect, l'aspect bien connu de chez eux? Mais nous devons nous méfier des predictions sceptiques: quoi qu'il arrive il se peut que des standards différents permettent de trouver plaisir dans le tourisme à l'avenir, aussi bien qu'aujourd'hui. 相似文献
16.
17.
18.
19.
Jase Sitton Christopher Stenzel Briggs Buchanan Metin I. Eren Brett Story 《Archaeometry》2023,65(3):463-479
Many factors governed the penetration efficacy of prehistoric projectile weaponry. Archaeologists broadly focus their efforts on understanding the effect of stone weapon tips because these specimens are often the only part of the weapon system that survives in the archaeological record. The tip cross-sectional area (TCSA) and perimeter (TCSP) of stone weapon tips have been shown to correlate with target penetration depth. Here, using results from both static and dynamic penetration testing, we compare TCSA and TCSP against other tip geometry metrics: lateral surface area (LSA) and volume (V). Our analyses broadly show that using a single-point geometry metric evaluated at multiple locations along the length of the point, or using multiple geometry metrics evaluated at a single location, better predicts required energy than using a single-point geometry metric evaluated at a single location. Our results also show that in the case where a single geometry metric evaluated at multiple locations is used LSA provided the most robust prediction models. Finally, our results show that for the case where all geometry metrics evaluated at a single location are used the location that provides the most robust prediction model is dependent on how far the point penetrated the target. 相似文献
20.
Juan Luis Gómez-Reino Santiago Lago-Peñas Jorge Martinez-Vazquez 《Journal of regional science》2023,63(4):793-819
The standard theory of optimal jurisdictional size hinges on the existence of economies of scale in the provision of local public goods and services. However, despite its relevance for forced local amalgamation programs and related policies, the empirical evidence on the existence of such economies of scale remains elusive. The main goal of this paper is to produce an updated and comprehensive quantitative review of the existence of economies of scale in the provision of local public goods using a meta-analysis approach to systematize the wide range of empirical approaches and modeling frameworks found in the previous literature. Our analysis confirms the presence of moderately increasing to constant returns to scale in the provision of local services with no reduction in the average costs of production in the delivery of most local public services beyond a certain, modest jurisdictional size, which many studies have estimated at 10,000 residents. Also, the potential for economies of scale differs at least across three traditional services: education, water and sanitation, and garbage collection, being highest for education and lowest for garbage collection. Our analysis also offers guidelines for future empirical research in this area. Physical output and production cost data should be used, together with translog specifications for the modeling of cost functions. Last, we find evidence that the determinants of output cost elasticity include bidirectional publication bias and population density but do not include the presence or absence of modern “lean” production technologies or the (perceived) capital intensity of the sector, contrary to conventional wisdom. These findings have significant policy implications for countries considering jurisdictional consolidation programs. 相似文献