全文获取类型
收费全文 | 105篇 |
免费 | 11篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2021年 | 1篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 7篇 |
2016年 | 8篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 28篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 4篇 |
2006年 | 2篇 |
2005年 | 6篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 2篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有116条查询结果,搜索用时 15 毫秒
91.
The Prince of Wales Fort was constructed in the 18th century as a Vauban style stone masonry fortification where the Churchill River flows into Hudson’s Bay, across the river from Churchill, Manitoba, Canada. Since completion the fort has been exposed to harsh weather conditions, which have led to significant deterioration and deformations in the walls, with some cases of localized collapse. Recently, an increase in the rate of degradation has made preventative conservation an issue of interest. For this conservation to be possible, an understanding of the cause of failure of the walls is first required. Discrete element modeling (DEM) using the non-smooth contact dynamics (NSCD) method utilized in the Program LMGC90 has been used as a first step in understanding the failure mechanism of the wall system. The results of the modeling show that the rubble core of the walls can transition from stability to instability as the cohesion between the stones is altered. Grouting the core will alter the bond between stones, increasing the stability of the core, and is thus one possible conservation method. 相似文献
92.
93.
Charlotte Roberts Nigel Rudgewick-Brown 《International Journal of Osteoarchaeology》1991,1(2):141-145
This paper describes the potential use of CD ROM in osteoarchaeology. It describes what CD ROM is and how it works, how CD ROM disks are produced and how the technique could be used in osteoarchaeology. The hardware required, both to produce and access compact disks, is outlined together with approximate costs. The possible uses of the technique in osteoarchaeology are suggested. Costs for the hardware are reasonable. However, collaboration between organizations will be essential. 相似文献
94.
Although regional variation in rates of capital accumulation is considered a major component of spatially uneven industrial development, it remains largely an understudied area. The theoretical and methodological problems that surround the measurement of capital, generally, alongside the lack of necessary information about a wide range of specific aspects, pose serious obstacles in any attempt to construct regional capital stock series. In such a context, the main aim of this paper is to make the best possible effort to construct a regional manufacturing fixed capital stock series for Greece. The limited availability of information (not unusual in regional as opposed to national contexts) and the necessity of making some arbitrary, but specified, assumptions mean that the estimation steps have to be presented in detail to assess reliability. Four regional fixed capital stock series for total manufacturing activity are generated. The results are then assessed in the context of uneven spatial development in Greece. 相似文献
95.
96.
Lenore Manderson (ed.). Women's work and women's roles: economics and everyday life in Indonesia, Malaysia, and Singapore. x, 257 pp. Canberra: Australian National University, 1983. (Development Studies Centre. Monograph 32.) [Distributed by Australian National University Press. A$12.]
Wolfgang Marschall (ed.). Der grosse Archipel: Schweizer ethnologische Forschungen in Indonesien. viii, 391 pp. Bern: Schweizerische Ethnologische Gesellschaft, 1985. (Ethnologica Helvetica, 10.) 相似文献
97.
98.
99.
100.
Xi Mei Kevin M. Curtin Daniel Turner Nigel M. Waters Matthew Rice 《Geographical analysis》2023,55(1):125-154
Accurately estimating the length of Vehicle Routing Problem (VRP) distances can inform transportation planning in a wide variety of delivery and service provision contexts. This study extends the work of previous research where multiple linear regression models were used to estimate the average distance of VRP solutions with various customer demands and capacity constraints. This research expands on that approach in two ways: first, the point patterns used in estimation have a wider range of customer clustering or dispersion values as measured by the Average Nearest Neighbor Index (ANNI) as opposed to just using a Poisson or random point process; second, the tour coefficient adjusted by this complementary spatial information is shown to exhibit statistically more accurate estimations. To generate a full range of ANNI values, point patterns were simulated using a Poisson process, a Matern clustering process, and a simple sequential inhibition process to obtain random, clustered, and dispersed point patterns, respectively. The coefficients of independent variables in the models were used to explain how the spatial distributions of customers influence the VRP distances. These results demonstrate that complementary spatial data can be used to improve operational results, a concept that could be applied more broadly. 相似文献