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   11篇
  免费   1篇
  2023年   1篇
  2020年   1篇
  2018年   2篇
  2015年   2篇
  2013年   1篇
  2011年   2篇
  2010年   1篇
  1997年   1篇
  1996年   1篇
排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
2.
The present paper surveys the discussions conducted by official statisticians regarding the ideal structure according to which a national data collection system should have been designed if it was to meet the challenges put up by the various transformation Western countries have undergone since the beginning of the 19th century. Arguments in favour of coordination, centralization, or decentralization have emerged for the first time in 1832 Britain, when the Statistical Bureau of the Board of Trade was created. Up to 1945, this debate went on, the industrial take-off, the economic crises, and the world wars all being occasions for its protagonists to put forward their preferred view. The perspective we take here is original in two respects: on the one hand, instead of confining ourselves to the major statistical systems (those of France, Britain, and the USA), we intend to evoke a large number of cases and, from this comparative standpoint, propose a general account of the drive towards centralization; on the other hand, instead of restraining our-selves to the 19th century, we cover the entire time-frame extending from 1800 to 1945.  相似文献   
3.
Archaeological wood, as most of natural materials, is slowly decomposing on the archaeological site due to various biological factors. Rapid and accurate estimation of the degradation level is extremely important for optimal restoration and conservation. The goal of this research was to verify the effectiveness of Fourier transform near infrared (FT-NIR) spectroscopy for archaeometry. The important advantage of the NIR spectroscopy is its accuracy, simplicity and ability to perform very high number of tests without needs of any destruction to the workpiece. Five oak pieces of the archaeological wood collected from waterlogged sites in Poland have been used. Cellulose and lignin contents, as well as crystallinity and the degree of polymerization were measured with standard reference methods and compared to the contemporary wood. The near infrared spectra represent all the physical/chemical changes of the wood due to waterlogging. This technique was successfully validated in rapid estimation of the cellulose and lignin contents. The method explored in this research might be a novel tool assisting experts in evaluation of the degradation state of archaeological and historical wooden materials.  相似文献   
4.
5.
From 1940 to 1943, Italian economists and statisticians were actively engaged in discussions that ranged from immediate concerns about war economy to more speculative issues that can be summarized under the then-fashionable label of the ‘new economic order’. The purpose of this article is to offer an overview of these debates by focusing, on the one hand, on the related themes of autarky, the new ‘Mediterranean order’ and postwar supranational economic complexes, and, on the other hand, on those of corporatism and economic planning. Both the idea of an economic plan and that of an organized division of labor among countries within a politically defined large economic space clashed directly with views associated with the tenets of economic liberalism, also dear to many Italian economists. On each theme, positions taken may be connected to expectations regarding the postwar world. Special attention will be given to various statistical devices and arguments put forward by protagonists to sustain their views or implement their projects.  相似文献   
6.
Based on an analysis of musical childhood memories from over 80 Germans from the Bohemian lands and historical evidence, this article investigates processes of social and political integration and assimilation of German children and young adults who, in the aftermath of the Second World War, were either expelled to Germany or remained in their Bohemian homelands. Memories of Germans expelled to West Germany disclose the various ways in which musical repertoire and musical practices are able to mitigate both the loss of the homeland and the distressing overall effects of expulsion, as well as reveal how music facilitates the building of a new sense of belonging in the face of geographic displacement and material dispossession. The study further highlights how the reframing and even silencing of musical practices on the other side of the Iron Curtain in Czechoslovakia affected processes of social-identity reconstruction until and after the 1989 fall of Communism. Results of this study foreground that individual musical experiences reveal new historical narratives of how German expellees used and still use musical practices to negotiate intercultural power relationships and rebuild a sense of belonging in their respective post-war environment in West Germany or Czechoslovakia/Czech Republic.  相似文献   
7.
The first attempts to identify amorphous organic substances in archaeology date to the end of the 19th century and the beginning of the 20th century. The 1960s saw the development of infrared spectrometry, and then separative and mass spectrometry analyses were implemented in the 1980s. But it is only since the 1990s that extended and systematic research programmes were devoted to these substances. The number of publications has not stopped growing and is becoming exponential. To get an overview of the lipid studies in archaeology, we conceived the ARchaeological Organic residues Literature Database (AROLD) as a first structured and collaborative research tool. This paper describes the challenges of setting up such a database, details its architecture, presents the choices involved in its implementation, and discusses the possibilities of sharing and evolving this tool.  相似文献   
8.
Vento, B. &; Prámparo, M. B., January 2018. Angiosperm association from the Río Turbio Formation (Eocene–?Oligocene), Santa Cruz, Argentina: Revision of Hünicken’s (1955 Hünicken, M., 1955. Depósitos neocretácicos y terciarios del extremo S.S.W. de Santa Cruz: Cuenca Carbonífera de Río Turbio. Revista del Instituto Nacional de Investigacion de las Ciencias Naturales 4, 1161. (in Spanish) [Google Scholar]) fossil leaves collection, Alcheringa 42, 125–153. ISSN 0311-5518.

The Río Turbio Formation (Eocene–?Oligocene) is of particular paleobotanical interest owing to its combination of high fossil plant diversity associated with the coexistence of warm-temperate and cool-temperate components. As the first suite of fossils related to a documented stratigraphic section, Hünicken’s fossil plant collection is one of the most important from the Paleogene of South America. A total of 34 angiosperm species from the collection were reviewed and taxonomically updated, with Nothofagus as the dominant genus. The taxa identified indicate a warm and humid climate with the development of some elements of a cool-temperate climate marked by a transitional climate change to cooler conditions. The comparison of angiosperms from different paleofloras from the southernmost of South America confirms that the assemblage of Río Turbio Formation was similar to that of the Río Pichileufú area, both from Patagonia, Argentina.

Bárbara Vento [] Mercedes B. Prámparo [] Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA) CCT-CONICET, Mendoza, Adrián Ruiz Leal s/n, Casilla Correo 131, C5500, Mendoza, Argentina.  相似文献   
9.
The 1920 British Empire Statistical Conference was the direct outcome of the Dominions Royal Commission's Final Report, which had spelt out the need to increase the uniformity and comparability of statistics originating from various parts of the Empire and had proposed setting up an imperial central statistical office. Over 24 days, delegates debated a large number of topics, ranging from the practical and empirical subject matters of statistical inquiry to more abstract issues such as the nature and object of statistical data collection and analysis, and to the problems raised by the establishment of a statistical bureau that would operate on an unprecedented scale. This article seeks to understand why, despite apparently favourable conditions, this project soon ended in complete failure. The reasons must be sought in the neatly distinctive outlooks held by the British government and Dominion representatives as regards the function of statistics for the purpose of government, in the quite different bureaucratic settings that embodied and sustained these views, as well as in the tensions and centrifugal pressures that acted upon inter-imperial relations following the Great War.  相似文献   
10.
A study was made of the degradation of archaeological Scots pine (Pinus sylvestris L.) at the Iron Age archaeological site of Biskupin, Poland. Wood degradation was evaluated after 10 years of deposition of samples in different burial conditions (mineral soil, peat and water) and at different depths (25, 50 and 100 cm) at the location of the original archaeological wood from the Lusatian culture settlement. Changes in the wood samples were assessed on the basis of selected physical (maximum water content, basic density and porosity) and chemical (chemical composition, structure of cellulose and lignin) properties. The observed degradative changes were different for samples deposited in different locations of the archaeological site and at different depths. They relate mainly to carbohydrates—both cellulose and hemicelluloses—although the structure of lignin also underwent changes. The experiment using wood that had been degraded to a similar degree to the Biskupin wood enabled identification of the actual danger of degradation of the latter. It was found that the remains of the wooden structure of the Biskupin settlement are degrading, despite the favourable physicochemical conditions prevailing at the site, and it is necessary to take measures to prevent its further decomposition.  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