全文获取类型
收费全文 | 1024篇 |
免费 | 39篇 |
出版年
2023年 | 11篇 |
2022年 | 8篇 |
2021年 | 7篇 |
2020年 | 22篇 |
2019年 | 28篇 |
2018年 | 35篇 |
2017年 | 42篇 |
2016年 | 34篇 |
2015年 | 27篇 |
2014年 | 23篇 |
2013年 | 173篇 |
2012年 | 55篇 |
2011年 | 61篇 |
2010年 | 53篇 |
2009年 | 63篇 |
2008年 | 49篇 |
2007年 | 40篇 |
2006年 | 59篇 |
2005年 | 49篇 |
2004年 | 14篇 |
2003年 | 20篇 |
2002年 | 24篇 |
2001年 | 12篇 |
2000年 | 16篇 |
1999年 | 8篇 |
1998年 | 16篇 |
1997年 | 3篇 |
1996年 | 11篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1985年 | 3篇 |
1984年 | 6篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1977年 | 2篇 |
1976年 | 6篇 |
1975年 | 2篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1972年 | 3篇 |
1971年 | 3篇 |
1969年 | 2篇 |
1968年 | 2篇 |
1954年 | 2篇 |
排序方式: 共有1063条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
Young JH 《Indiana magazine of history》1992,88(4):303-319
5.
6.
Debates about the future of small municipalities in Canada are set against a backdrop of economic, political, and social restructuring processes that have displaced former state investment policies in favour of neoliberal public policy approaches. Small municipalities struggle with outdated financial and governance structures and a provincial public policy agenda that asks them to become more creative, innovative, and “entrepreneurial” in their approach and responsibilities. Drawing upon key informant interviews with eight case studies in British Columbia, Canada, this research examines the tensions between municipal reforms mandated by the provincial government over the past 30 years and commensurate fiscal levers and capacities in place to address these broadening responsibilities for small municipalities in volatile staples-dependent regions. Our findings demonstrate how successive provincial governments have mobilized New Public Management objectives through a host of legislative and regulatory changes that have increased the responsibilities and requirements on local governments without commensurate fiscal or jurisdictional capacity. 相似文献
7.
The measurement and interpretation of spatial economic structure have presented many problems for analysts. The notion of a spatial multiplier has received even less formal attention; part of the motivation for this paper is the examination of the degree to which sectoral decomposition analysis might prove useful in illuminating the paths of interaction across space that are associated with changes in exogenous activity levels. In this paper, we present three perspectives that examine spatial structure in the context of an aggregated interregional social accounting matrix for Bangladesh. These perspectives examine structure at the micro-, meso-, and macrolevels and are interpreted with the assistance of several alternative methods, including structural path analysis, the field of influence, the superposition principle, multiregional feedback loop analysis, and the Matrioshka Principle; the results are interpreted analytically and cartographically. Some attention is also devoted to the formulation of a general approach to spatial multipliers. It is shown that the structure of flows and the structure of influence reveal patterns that, taken together, provide important insights into an understanding of structure and may prove to form the basis for the eventual formal presentation of the spatial multiplier. 相似文献
8.
Seung Jong Lee 《政策研究杂志》1994,22(1):87-108
This study advances a comprehensive model of urban service distribution based upon types of urban services, to which little concern has been paid in the study of service distribution. By introducing an integrating typology of urban services, it shows how the pattern of service distribution varies depending on service type. By doing so, this study demonstrates that polarized discussions about the primacy of different explanatory models are inadequate and artificial, and that seemingly contradictory models are not necessarily mutually exclusive when the effect of service type on the distribution of services is taken into consideration. 相似文献
9.
黄铜器表面着色方法的研究 总被引:3,自引:0,他引:3
在总结古代铜器表面处理的文献基础上一通过化学成膜探讨含锌32%-36%的黄铜试样表面着色的方法,通过调整和控制试液的浓度、温度、酸度及浸泡时间的实验,确定黄铜表面栗色膜形成的最佳条件。对表面形成的粟色膜用多种实验手段进行了测定,结果表明栗色股厚度约为8μm主要组成为Cu2O。并对化学过程中形色栗色膜的机理作了初步探体 相似文献
10.
明墓出土的历书,粘连固结成块,脆硬易于折断。通过实验分析研究,探明其主要原因可能是木质素选择性地吸附的钙铁离子与蛋白质的分解物形成复杂物质,沉积在纸上,渗入书内所致。故揭取该历书的关键是去除钙离子,EDTA二钢,碱性过氧化氢、气相二氧化硅等的分步处理,使脆硬的纸张软化,再逐页分离揭取,然后再去除色素沉淀物,终于恢复了书的原貌。 相似文献