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   443篇
  免费   28篇
  2023年   8篇
  2022年   2篇
  2020年   9篇
  2019年   20篇
  2018年   28篇
  2017年   34篇
  2016年   25篇
  2015年   17篇
  2014年   25篇
  2013年   99篇
  2012年   18篇
  2011年   22篇
  2010年   15篇
  2009年   12篇
  2008年   8篇
  2006年   8篇
  2005年   5篇
  2004年   5篇
  2003年   3篇
  2002年   10篇
  2001年   4篇
  2000年   3篇
  1999年   9篇
  1998年   4篇
  1997年   6篇
  1996年   3篇
  1995年   4篇
  1994年   5篇
  1993年   2篇
  1990年   2篇
  1988年   4篇
  1987年   2篇
  1986年   2篇
  1985年   4篇
  1984年   3篇
  1983年   3篇
  1982年   3篇
  1981年   3篇
  1980年   3篇
  1977年   5篇
  1976年   4篇
  1975年   4篇
  1974年   1篇
  1972年   1篇
  1968年   1篇
  1966年   1篇
  1964年   2篇
  1960年   3篇
  1959年   1篇
  1950年   1篇
排序方式: 共有471条查询结果,搜索用时 249 毫秒
371.
372.
The South Edinburgh Channel wreck consists of the remains of a large, unidentified armed merchant ship whose cargo included a rare consignment of Swedish plate‐money, among other goods. The wreck was lost some time in the later part of the 18th century in the Thames Estuary and was uncovered briefly by natural means between 1972 and 1977. This allowed archaeological investigation, which was undertaken in very poor environmental conditions in the early days of maritime archaeology in the UK.  相似文献   
373.
Abstract

This article was presented as a paper to ‘World Cultural Heritage: a global challenge’, an International Symposium at Hildesheim, Germany in February 1997. The paper outlines the problems of attempting to develop a combined heritage and tourism strategy for the small, remote, Himalayan kingdom of Mustang. The development of tourism brings both opportunities and threats to local people and their identity.  相似文献   
374.
Abstract

The main thrust of this text is to acknowledge the relationship between gastronomy and heritage as a key motivator for travel. Gastronomy, as a central part of culture, and its influence on other aspects of culture has received scant recognition from the academic world generated by tourism. Gastronomy, heritage and tourism are old friends; the relationship between them is mutually parasitic. Gastronomy's role as a cultural force in developing and sustaining heritage tourism is addressed, as is its increasing role as a catalyst in enhancing the quality of the tourist experience. Today's consumers’ search for an individual lifestyle is changing tourism and the ‘new tourist’ is using the holiday for acquiring insight into other cultures. Recent research and current market trends are examined to reveal the increasing significance of gastronomy to holiday choice. It is argued that gastronomy brings culture and cultures together. Place and setting enhance the food experience and arguably vice‐versa. Heritage and gastronomy combined make for an excellent marriage of tourist resources. The text argues that this combination is both used and viewed by the tourist. As such the tourist becomes engaged in cultural heritage to a deeper level.  相似文献   
375.
Johann Jakob Wepfer (1620–1695), city physician in Schaffhausen, Switzerland, published two books on “apoplexy.” He proposed new ideas about the events in the brain during such attacks, based on Harvey’s theory of the circulation of the blood. Wepfer postulated extravasation of whole blood or serum in the brain, in opposition to the Galenic notion of blocked ventricles. His case histories are remarkably precise and untainted by interpretation. This allows the recognition of a patient with word blindness, who was also unable to read words written by himself. Unlike patients with pure “alexia without agraphia,” he could not write complete sentences because of additional language defects, especially speech comprehension. Jules Dejerine (1849–1917) would, in 1892, not only describe a patient with the pure form of this syndrome (cécité verbale avec intégrité de l’écriture spontanée et sous dictée) but also provide an explanation of its anatomical basis.  相似文献   
376.
Aretaeus of Cappadocia's classification of headache has been referred to for many centuries. Several Latin translations and an English translation (1856) of his books have been published in the past. We translated the pertinent texts on headache from the Greek text as published by Hude in 1958. In this paper, we present an annotated translation preceded by an outline of contemporary knowledge of headache from Celsus’ De Medicina. Although symptomatic headache was most probably involved in the types of headache identified by Aretaeus and the making of retrospective diagnoses is hazardous, the terms heterocrania and cephalea may be compared with what today we would call migraine and tension type headache respectively.  相似文献   
377.
Abstract

Maps showing a town together with its surroundings form a distinctive, if diverse, genre, the environs map. Such maps can be described according to function or intended use and include military, administrative, judicial, economic and communications maps as well as maps associated with the development of recreation and with local improvement projects. In this paper, attention is focused on two types of environs maps from Vienna: those showing projected hydrological schemes and those prepared primarily for use in connection with recreational facilities for the townsfolk.  相似文献   
378.
Abstract

Commercial map publishing firms between the mid‐sixteenth and mid‐nineteenth centuries needed to prolong the life of their copper plates for as long as possible. In order to avoid the costs of engraving new plates, the famous Dutch publishing house of Covens & Mortier of Amsterdam (1685–1866) amended existing plates for topographical and politico‐administrative changes, engraving errors, imprint alterations and marks resulting from general wear. Not only were the plates altered, but the printed maps themselves were sometimes also modified: a new title cartouche might be pasted on or a date or part of the text scratched away. In these ways the map publishing firm was a master of creative solutions as regards both the re‐use of old copper plates and the ‘renewal’ of old printed maps.  相似文献   
379.
During the first half of the twentieth century, despatches about the coldest corner of the British Empire were circulated to three, sometimes four, of its southern neighbours under the British crown: Australia, New Zealand, South Africa and the Falklands. Of these four, South Africa seemed the least interested in Antarctica, despite the keen interest of some influential individuals and a strategy of bringing Antarctica into the imperial fold through British dominions that were proximate to Antarctica. In this context, we ask how South Africa viewed itself in relation to the Antarctic to the south and the British metropole to the north. We discuss the key activities that connected South Africa to Antarctica—whaling and weather forecasting. Moreover, we consider some of the enterprising plans for a South African National Antarctic expedition, and what these plans reveal of South Africa's perception of itself as a southern country. This article interlinks with a growing scholarship that is critical of treating Antarctic history as politically and culturally isolated, including showing how the relatively simple natural and political ecology of the Antarctic can throw into relief multiple national and international concerns.  相似文献   
380.
The concept of base isolation is a century old, but application to civil engineering structures has only occurred over the last several decades. Application to light-frame wood buildings in North America has been virtually non existent with one notable exception. This article quantitatively examines issues associated with application of base isolation in light-frame wood building systems including: (1) constructability issues related to ensuring sufficient in-plane floor diaphragm stiffness to transfer shear from the superstructure to the isolation system; (2) evaluation of experimental seismic performance of a half-scale base-isolated light-frame wood building; and (3) development of a displacement–based seismic design method and numerical model and their comparison with experimental results. The results of the study demonstrate that friction pendulum system (FPS) bearings offer a technically viable passive seismic protection system for light-frame wood buildings in high seismic zones. Specifically, the amount and method of stiffening the floor diaphragm is not unreasonable, given that the inter-story drift and accelerations at the upper level of the tested building were very low, thus resulting in the expectation of virtually no structural, non structural, or contents damage in low-rise wood frame buildings. The nonlinear dynamic model was able to replicate both the isolation layer and superstructure movement with good accuracy. The displacement-based design method was proven to be a viable tool to estimate the inter-story drift of the superstructure. These tools further underscore the potential of applying base isolation systems for application to North America's largest building type.  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