全文获取类型
收费全文 | 8280篇 |
免费 | 629篇 |
国内免费 | 77篇 |
专业分类
财政金融 | 892篇 |
工业经济 | 478篇 |
计划管理 | 1915篇 |
经济学 | 1149篇 |
综合类 | 467篇 |
运输经济 | 177篇 |
旅游经济 | 388篇 |
贸易经济 | 2466篇 |
农业经济 | 431篇 |
经济概况 | 623篇 |
出版年
2024年 | 35篇 |
2023年 | 166篇 |
2022年 | 137篇 |
2021年 | 266篇 |
2020年 | 407篇 |
2019年 | 388篇 |
2018年 | 361篇 |
2017年 | 403篇 |
2016年 | 311篇 |
2015年 | 297篇 |
2014年 | 369篇 |
2013年 | 830篇 |
2012年 | 536篇 |
2011年 | 629篇 |
2010年 | 395篇 |
2009年 | 283篇 |
2008年 | 663篇 |
2007年 | 574篇 |
2006年 | 540篇 |
2005年 | 388篇 |
2004年 | 277篇 |
2003年 | 191篇 |
2002年 | 132篇 |
2001年 | 88篇 |
2000年 | 68篇 |
1999年 | 60篇 |
1998年 | 46篇 |
1997年 | 42篇 |
1996年 | 24篇 |
1995年 | 11篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有8986条查询结果,搜索用时 15 毫秒
891.
Forest transition in Northern Spain: Local responses on large-scale programmes of field-afforestation 总被引:1,自引:0,他引:1
Public field-afforestation schemes have been designed and widely implemented as a measure to alleviate uneven distribution, generate economic growth in rural areas and maintain or improve natural resources. The literature on forest management and planning has improved land-related information systems, allowing policy-makers to design and implement future policies on the allocation of forestland uses, and to forecast the land requirements of the target population more closely. The aim of this article is to empirically examine and validate the temporal and spatial land use changes and the socioeconomic effects linked to field-afforestation on private lands in the province of Lugo (Galicia, Northern Spain) at the municipal, parish and individual farm holding levels. Two main top-down field-afforestation programmes are reviewed in the study area: the national programme of public afforestations started with the implementation of Ley de Patrimonio Forestal del Estado (National Forest Estate Act; NFE) from 1941 to 2000, and the European aid scheme for forestry measures established under European Council Regulation No. 2080/1992 from 1993 to 1997. The results of a survey, targeted at 1355 farmers and conducted through questionnaires in the province of Lugo in 2004, complete the analysis of public intervention in forest management. The results indicate that the specific social, economic and environmental context of an agricultural and forestry area involves a differential heritage of land customs that determines a differential response model to forest programmes of land allocation and planning. Therefore, this must not be underestimated by the quantitative or qualitative general objectives of large-scale policies. 相似文献
892.
本文针对科技价值难以管理的问题,利用VM/VE的方法构建科技价值体系,以通过价值对科技项目进行管理。 相似文献
893.
894.
知识经济中人才是最重要的资源.西部大开发处在知识经济迅猛发展的历史阶段,人才开发对西部经济发展具有十分重大的战略意义.西部人才开发的核心是人才体制的创新.构建优良的人才环境系统是西部人才开发的目标.只有这样,我国才有可能完成西部大开发的历史重任. 相似文献
895.
896.
基于全球价值链分工的浙江制造业集群的危机主要表现在四个方面。即:全球价值链的空间分化中成本优势的丧失和资源的匮乏、增值链的非均衡造成的对外部联系的过度依赖、全球价值链治理的集群升级困难、发达国家贸易壁垒的限制。在参与全球价值链分工的同时,应及时规避集群风险,促进经济又好又快发展。 相似文献
897.
电子商务模式是电子商务应用的关键问题,本文从电子商务网站控制者角度出发,对电子商务模式进行研究,在已有成果分析总结基础上,提出了一类基于价值网的第四方电子商务模式,研究了第四方电子商务模式产生原因,及对中企业电子商务应用的影响,同时指出了电子商务模式发展的趋势。 相似文献
898.
899.
《Journal of medical economics》2013,16(4):348-355
AbstractObjective: To describe the incidence of diagnosis of gastroesophageal reflux disease and acid-related conditions (GERD/ARC) throughout childhood and characterize patterns of diagnosis and treatment with proton pump inhibitors (PPIs) and histamine-2 receptor antagonists (H2RAs).Methods: Cohorts of GERD/ARC children (age 0–18 years) were identified from a large US administrative claims database covering 1999–2005 using ICD-9 codes. Incidence, healthcare utilization (HCU), costs, therapy discontinuation and switching rates were compared between various age and patient groups.Results: Between 2000 and 2005 annual incidence of GERD/ARC diagnosis among infants (age ≤1 year) more than tripled (from 3.4 to 12.3%) and increased by 30% to 50% in other age groups. Patients diagnosed by GI specialists (9.2%) were more likely to be treated with PPIs compared to patients diagnosed by primary care physician (PCP). PPI-initiated patients doubled (from 31.5% in 1999 to 62.6% in 2005) and, when compared with H2RA-initiated patients, were associated with 30% less discontinuation and 90% less therapy switching in the first month, and with higher comorbidity burden and pre-treatment total HCU and costs when diagnosed by GI specialists.Limitations: The use of an exploratory definition for GERD/ARC, administrative claims data and potential coding errors in diagnosis codes used in selection process may limit the generalizability of the results.Conclusions: GERD/ARC incidence increased for children of all ages between 2000 and 2005. PCPs made the majority of diagnoses. PPI initiations have now surpassed H2RA initiations. 相似文献
900.
《Enterprise Information Systems》2013,7(4):401-421
Reference models play an important role in the knowledge management of the various complex collaboration domains (such as supply chain networks). However, they often show a lack of semantic precision and, they are sometimes incomplete. In this article, we present an approach to overcome semantic inconsistencies and incompleteness of the Supply Chain Operations Reference (SCOR) model and hence improve its usefulness and expand the application domain. First, we describe a literal web ontology language (OWL) specification of SCOR concepts (and related tools) built with the intention to preserve the original approach in the classification of process reference model entities, and hence enable the effectiveness of usage in original contexts. Next, we demonstrate the system for its exploitation, in specific – tools for SCOR framework browsing and rapid supply chain process configuration. Then, we describe the SCOR-Full ontology, its relations with relevant domain ontology and show how it can be exploited for improvement of SCOR ontological framework competence. Finally, we elaborate the potential impact of the presented approach, to interoperability of systems in supply chain networks. 相似文献