全文获取类型
收费全文 | 1539篇 |
免费 | 5篇 |
专业分类
财政金融 | 15篇 |
工业经济 | 677篇 |
计划管理 | 243篇 |
经济学 | 517篇 |
运输经济 | 1篇 |
旅游经济 | 33篇 |
贸易经济 | 41篇 |
农业经济 | 2篇 |
经济概况 | 6篇 |
邮电经济 | 9篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2019年 | 4篇 |
2018年 | 7篇 |
2017年 | 8篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 25篇 |
2013年 | 26篇 |
2012年 | 82篇 |
2011年 | 310篇 |
2010年 | 254篇 |
2009年 | 178篇 |
2008年 | 131篇 |
2007年 | 150篇 |
2006年 | 118篇 |
2005年 | 80篇 |
2004年 | 60篇 |
2003年 | 45篇 |
2002年 | 50篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1996年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有1544条查询结果,搜索用时 250 毫秒
71.
Luiz C.M. Miranda Author Vitae Author Vitae 《Technological Forecasting and Social Change》2010,77(2):175-192
A new multi-logistic methodology to analyze long range time series of evolutionary S-shaped processes is presented. It conceptually innovates over the traditional logistic approach. The ansatz includes computing the residuals to an optimized multi-logistic trend curve least squares fitted to the time-series data. The elements of the residuals series are checked for autocorrelations and once detected the residuals series is further analyzed to search for eventual presence of underlying periodic structures using a truncated Fourier sine series. The method foundations ensures both a universal applicability and a capacity to disclose the existence of active clocks that can be possibly traced to the driving motors of the evolutionary character of the time series, due to the responsiveness of corresponding process to the development of economic cycles. On associating these two views, it is found that the methodology has a strong potential to improve the quality of short-term forecasts. These findings have been put to test through applications of the methodology to studying the time evolution of two commodities of strong economic and social importance (corn and steel) and good results were consistently obtained for both the analytical and forecasting aspects. 相似文献
72.
73.
Felix Brandes Author Vitae 《Technological Forecasting and Social Change》2009,76(7):869-879
Since the early 1990s, ‘Technology Foresight’ exercises with special emphasis on the use of Delphi surveys have played an important role in science and technology (S + T) policy across Europe in an effort to focus resource allocation. Yet, none of the estimates made in the European Delphi surveys have been formally assessed in retrospect, while this process has been incorporated into the Japanese surveys since 1996. Taking the UK Technology Foresight Programme, this research sets out to assess the estimates of three of the fifteen panel Delphi surveys. Whilst on average 2/3 of Delphi statements were predicted to be realised by 2004, it will be shown that only a fraction of these statements had been realised by 2006. Based on the evidence collected from the published panel reports, the ‘Hindsight on Foresight’ survey conducted by OST in 1995 and interviews with panel members, it will be argued that the overwhelming majority of estimates were overly optimistic. While optimism and strategic gaming of experts is the most convincing explanation for these results, process factors were also explored, including the quality of expert panels used, the Delphi statements and the respondents of the Delphi questionnaire. It is argued that at least the issue of short-range optimism and strategic gaming of experts should be addressed in future Delphi exercises, as decision makers relying on expert advice cannot deal with this issue alone. 相似文献
74.
Christiane Hellmanzik 《European Economic Review》2010,54(2):199-90
This paper shows that ‘location matters’ in terms of premiums on creative clusters and peak ages. The analysis is based on the 214 most prominent modern visual artists born 1850-1945 and the art clusters of Paris and New York. Auction records of the past 20 years are used to estimate the value of artworks over an artist's career. The overall cluster premium for paintings produced in Paris and New York is found to be 11% and 43%, respectively; paintings made in Paris during the First World War have a premium of 14% while those produced between 1946 and 1975 have a premium of 27%. New York offers premiums for paintings produced there for all periods after the First World War, peaking at 74% between 1946 and 1975. When decomposing this premium, we find that quality rather than quantity of artists in the location is driving the results. It is argued that artists working in a cluster location reach a peak in the age-price profile of their work significantly earlier than artists working elsewhere. 相似文献
75.
Regina C. McNally Author Vitae Serdar S. Durmusoglu Author Vitae Roger J. Calantone Author Vitae Nukhet Harmancioglu Author Vitae 《Industrial Marketing Management》2009,38(1):127-143
Product strategy links to new product development (NPD) through new product portfolio management (NPPM). This dynamic decision process addresses the strategy implementation questions of identifying which new product ideas to pursue and their relative priorities. Despite the importance of NPPM in implementing product strategy, firms exhibit substantial performance-affecting differences. We investigate one potential source for such differences by examining the impact of managers' dispositional factors as a possible explanation. Using a case study research method, we examine differences in NPPM strategies and managers' revealed dispositional traits across three divisions of a single conglomerate firm operating in different business-to-business markets. Based on our analysis, we offer propositions relating managers' dispositions to NPPM strategy: analytic cognitive style is associated with balance, ambiguity tolerance is associated with strategic fit, and leadership style is associated with the relative weights applied to each dimension. 相似文献
76.
Leyland Pitt Author Vitae Rian van der Merwe Author Vitae Author Vitae Esmail Salehi-Sangari Author Vitae Author Vitae 《Industrial Marketing Management》2006,35(5):600-610
The role of networks in business operations is widely recognized. We discuss social network theory, identify its main constituents, and outline a methodology and procedure that enable the identification and valuation of informal networks in an international business-to-business environment. Research is carried on informal Internet networks among firms in the biotechnology industry from Sweden and Australia. We use the methodology to recognize salient nodes, determine prominence and identify structural holes that allow the unveiling of brokerage opportunities that lie latent in networks. Global firms and suppliers of industrial products that are or can position themselves effectively in a social network are in a position to leverage considerable value. 相似文献
77.
David Ubilava Author Vitae Kenneth A. Foster Author VitaeAuthor Vitae Tomas Nilsson Author Vitae 《Technological Forecasting and Social Change》2010,77(4):587-593
Recent developments in environmental and animal welfare issues, and the introduction of new production practices may have affected consumer attitudes and preferences toward differentiated product choice. Factors such as animal well-being, environmentally friendly production, and the use of antibiotics appear to be increasingly core consumer concerns. We link the aforementioned with Maslow's hierarchy of needs suggesting that the higher income consumers should be more altruistic in their consumptive behavior and test this by evaluating consumer preferences for these attributes in pork chops. We also test whether social consciousness of the consumers translates into choice behavior. Data was obtained by choice experiment surveys and mixed logit estimation was used to estimate consumers' willingness-to-pay for the credence attributes. Results reveal that both, higher income and socially aware consumers are on average willing to pay higher premiums for the antibiotic-free attribute, but not for other two social attributes. Also, the group of higher income consumers is highly heterogeneous in their preferences, whereas socially aware consumers tend to be more homogeneous in their preferences. 相似文献
78.
Mario Coccia Author Vitae 《Technological Forecasting and Social Change》2010,77(2):248-264
The purpose of this paper is to analyze the relationship between democratization and technological innovation. In primis, the paper shows, through economic history, that democratization is an antecedent process (cause) to technological and economic change (effect). In particular, the primary finding is that democratization is a driving force for technological change: most free countries, measured with liberal, participatory, and constitutional democracy indices, have a higher level of technology than less free and more autocratic countries. In fact, “democracy richness” generates a higher rate of technological innovation with fruitful effects for the wellbeing and wealth of nations. These findings and predictions lead to the conclusion that policy makers need to be cognizant of positive associations between democratization and technological innovation paths in order to support the modern economic growth and future technological progress of countries. 相似文献
79.
This paper contributes to understanding the determinants of patent value. By drawing on a real options approach, we develop a theoretical model of patent value, which explicitly considers the uncertainty about future value. On this basis, we rely on Monte Carlo simulations with data from a case study in a large chemical firm to estimate patent value according to our model. In the simulation analyses, we compare an R&D project with patent protection and the same project without patent protection. The difference of the values of the two projects is the surplus in profit that may be expected from having a patent covering the project. This surplus is regarded as the value that is directly attributable to the patent. The results of the simulation analyses indicate that the development costs and expected net cash flows of a patent-protected project are higher than of an unpatented project. The higher net cash flows outgrow the increased development costs, and patent value is positive. However, this value is smaller than the overall project value of the patent-protected R&D project. 相似文献
80.
Nedaa Agami Author Vitae Hisham El-Shishiny Author Vitae 《Technological Forecasting and Social Change》2010,77(7):1051-1060
All Trend Impact Analysis (TIA) algorithms in literature conduct the analysis based on direct estimates provided by experts for the probability of occurrence of an unprecedented event as an input to the algorithm. In this paper, we propose an advanced mechanism to generate more justifiable estimates to the probability of occurrence of an unprecedented event as a function of time with different degrees of severity using Fuzzy Logic. We postulate that in some cases it is better not to estimate the probability of occurrence of an unprecedented event directly; but rather estimate it indirectly via its attributes, using Fuzzy Logic. The core idea of the paper is to customize the generic process of reasoning with Fuzzy Logic by adding the additional step of attributes simulation, as unprecedented events do not occur all of a sudden but rather their occurrence is affected by change in the values of a set of attributes, especially when they reach certain threshold values. 相似文献