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   2337篇
  免费   200篇
  国内免费   12篇
财政金融   96篇
工业经济   79篇
计划管理   356篇
经济学   1171篇
综合类   107篇
运输经济   24篇
旅游经济   59篇
贸易经济   147篇
农业经济   384篇
经济概况   126篇
  2024年   8篇
  2023年   53篇
  2022年   219篇
  2021年   133篇
  2020年   394篇
  2019年   306篇
  2018年   61篇
  2017年   83篇
  2016年   89篇
  2015年   66篇
  2014年   109篇
  2013年   149篇
  2012年   157篇
  2011年   141篇
  2010年   126篇
  2009年   67篇
  2008年   79篇
  2007年   66篇
  2006年   64篇
  2005年   41篇
  2004年   28篇
  2003年   26篇
  2002年   30篇
  2001年   14篇
  2000年   12篇
  1999年   11篇
  1998年   7篇
  1997年   1篇
  1996年   2篇
  1995年   4篇
  1992年   1篇
  1985年   1篇
  1981年   1篇
排序方式: 共有2549条查询结果,搜索用时 78 毫秒
51.
This paper sheds light on policy‐related implementational fluidity—a context‐dependent adaptation of policies—adopted by policy implementers to address heterogeneous needs of subsistence consumer‐merchants (SCMs). In subsistence research, despite the emphasis on bottom‐up policymaking, implementational fluidity persists because of institutional and sociocultural factors that hinder policy implementers’ from effectively and accurately implementing the policies. To enrich the current bottom‐up policy process, this paper shares insights from an ethnographic study of Fijian market traders and marketplace personnel (policy implementers) and shares insights on how implementational fluidity manifests in subsistence marketplaces. Analysis reveals the interplay amongst sociohistorical context, marketplace relational dynamics and policies leading to policy adjustments and re‐negotiation by marketplace personnel and perceived injustices amongst the SCMs. The paper provides policy recommendations and practice ideas for subsistence researchers and policy practitioners to examine policy implementation gaps and the role of policy implementers in subsistence marketplaces.  相似文献   
52.
近年来随着中国对交通运输与旅游融合的重视,风景道的研究与建设被提上日程。基于对生态保护、特色景观与休闲游憩的多元需求,由国内对风景道的研究和一系列实例入手,在传统风景道概念的基础上提出建设居于多元价值的生态风景道。同时,以乌兰察布四横风景道的规划为例,研究了基于形态学空间格局分析的生态网络构建、景观视觉评价的景观节点建设及串联沿途旅游资源的绿道系统建设,在实践中探讨了多元价值目标导向下风景道规划设计的策略和方法。  相似文献   
53.
This paper demonstrates that the framing of post-war Kowloon Walled City through photos has been dominated by the maps commonly used to represent this Chinese enclave in colonial Hong Kong as a place. Inspired by and extending Wylie’s (2009) argument that emptiness and presence are equally important, this paper uses basic GIS techniques and hitherto unpublished archival materials to help (a) argues that the colonial government’s mindset of clearly defining the spatial boundary of the city, which is a subtle admission of an officially and diplomatically denied otherness in ownership, created the city as a quasi-cadastral unit; and (b) explains how this shaped the framing of the landscape of the city by promoting investment and trade in high-rise housing development units. The government did not destroy its walls. When these were physically destroyed, it did not ignore the walls’ original alignments but treated the city as a planning unit, as if they still existed.  相似文献   
54.
Landscape is defined by the European Landscape Convention as “an area perceived by people, whose character is the result of the action and interaction of natural and/or human factors”. Many efforts have been devoted in addressing the core concepts on which this definition roots: perception and interaction of men and nature, but when coming to large (continental) scale assessments, the latter prevail on the former.This paper aims at presenting a framework for a measurable landscape awareness indicator as a key link to the public demand for a specific type of landscape: the agricultural landscape. This is a necessary effort to complement more physically based assessments, which include as well the impact of human activities on landscapes.The analysis is carried out at different levels of governance: EU and regional, using an example from the Alentejo region in Portugal and EU wide databases, and addresses conceptual and practical questions: what type of societal landscape awareness can be monitored and by whom (e.g., individuals, specific social groups, society as a whole); what are the landscape dimensions that should be assessed; what are the limitations imposed by data-related constraints. By applying the methodology to build composite indicators to map landscape societal awareness, the paper shows the regional and local meaning of indicator approaches developed at European level, presents developments for downscaling to regional level, while introducing the social component to support sound policy development for European rural landscapes.  相似文献   
55.
The paper deals with the process of searching and inventorying of relict - so-called pre-industrial landscape - in Moravia (approximately 1/3 of the territory in the east of the Czech Republic). So far, during the inventory of pre-industrial landscape segments in Moravia, around 1,500 land use mosaic areas have been registered, surviving without significant changes since the completion of maps of the so-called stable cadastre realized in the 1830s to the present. Each of these areas with a steady mosaic has been supplemented with substantial quantitative and qualitative characteristics. This paper presents the results of geodatabase analysis of segments of the pre-industrial landscape concerning the sea elevation and morphology of the area. The results show that although numerous parts of stable ancient landscapes have been preserved at higher altitudes, they reach larger separate areas and larger aggregate areas at lower altitudes with more fertile soils. Hypotheses attempting to explain this territorial disparity are also presented in the text of the paper.  相似文献   
56.
Researchers have spent substantial effort to identify factors influencing pesticide use intensity. However, few studies have compared the relative importance of these factors. This study examines four categories of factors that potentially influence farmers’ pesticide use decisions by evaluating incentivized experiment data, farm survey data, and remote sensing data in China. Our results suggest that land diversification has the largest effect on farmers’ pesticide use. Compared with the most rice-intensive landscape type, less rice-intensive systems cause farmers to spray less on middle rice. Heavy pesticide use intensity is associated with land fragmentation as small-scale farms still dominate crop production. Farmers’ integrated pest management knowledge has significant effects on pesticide use. We also find that loss and ambiguity preferences, rather than risk preferences, are more likely to affect pesticide use intensity.  相似文献   
57.
R. Collet 《Applied economics》2016,48(30):2807-2821
This article formulates and estimates a structural intertemporal model of labour force participation. Relying on theoretical characterizations derived from an economic model of lifetime behaviour, we estimate a dynamic probit model with correlated random effects using longitudinal data to allow for a dynamic structure. The model is applied to a panel of married women drawn from the 1997–2002 French Labour Force surveys in order to represent their participation behaviour. It is estimated by maximum simulated likelihood. Our results show that women’s decisions to go out to work are characterized by significant state dependence, unobserved heterogeneity and negative serial correlation in the transitory error component. In addition, we find that the presence of young children in a woman’s household reduces her labour participation, but unequally according to their age and number. As expected, educational level has a positive impact on women’s participation. Last, a rise in the husband’s wage is found to raise female participation initially and to lower it subsequently. This empirical finding suggests that leisure may not systematically be a normal good, contrary to what is frequently assumed in the literature.  相似文献   
58.
孔海东  张培  刘兵 《技术经济》2019,35(6):99-108
通过文献调查并结合案例的描述性分析,提出数字技术时代价值网络中不同行为主体之间的赋能内涵、关键维度以及基于赋能跨层次效应的价值共创行为分析框架。将"赋能氛围""主体赋能"分别作为价值网络中赋能的宏观维度和微观维度进行概念化。界定了两个维度的关键组成要素,分别包括信息共享、开放性结构、协同规则以及主体关系、资源整合和影响。构建了赋能的跨层次效应模型,分析了赋能的宏观-微观跨层次效应及其对价值网络生态和主体价值创造的影响。  相似文献   
59.
王阳 《价值工程》2014,(17):326-327
任何设计在设计初期都需要构想,而构想需要系统性的建立。构想本身是一个系统,它包括立意、构思、表达技巧三个子系统。只有对这三个子系统拆分开来,对每一个子系统都进行深入的分析与了解后再将它们联系起来构成一个和谐统一的整体,才能建立一个系统的构想。从而才能创造出科学合理、适合城市发展并适应人们生活的景观。  相似文献   
60.
Landscapes provide an array of services to society, from the provision of food and material, to the provision of cultural ecosystem services such as recreation, aesthetics or spirituality. Studies on cultural ecosystem services, however, remain rare and little is known about the spatial localisation of these services. In this study, we adopt and test a framework to identify and map the provision of cultural ecosystem services as perceived by tourists in an Alpine region, i.e. the region of South Tyrol in Italy. A photo-based questionnaire survey is combined with cartographical representations of landscape types to elicit hot and coldspot areas of cultural ecosystem service provision. We statistically test for influences of the land use type and the respondents' socio-demographic background on the tourists' perception of these services. The results show that different spatial patterns emerge for each of the investigated cultural ecosystem services depending on the distribution and extent of the landscape types to which they are related. In particular traditionally managed landscapes, small in extent and mainly scattered over large areas between 1000 and 2200 m a.s.l., are hotspot areas of aesthetic beauty, leisure activities and spirituality. In contrast, intensively managed landscapes, mainly located in the lowland plains of the study site, are considered to be more important for the provision of cultural heritage values. While the results suggest that land use type exerts the strongest influence upon tourists' perception, factors such as the respondents' perceived importance of the services, their gender, cultural background, environmental engagement and experience with the landscape play a significant but subordinate role. We conclude that the spatially explicit information about the provision of cultural ecosystem services can serve as a helpful basis for the design and further implementation of land use policies that acknowledge the high touristic value of traditionally used landscapes in mountain regions.  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