全文获取类型
收费全文 | 31199篇 |
免费 | 434篇 |
国内免费 | 13篇 |
专业分类
财政金融 | 5185篇 |
工业经济 | 1814篇 |
计划管理 | 4948篇 |
经济学 | 7012篇 |
综合类 | 744篇 |
运输经济 | 105篇 |
旅游经济 | 346篇 |
贸易经济 | 6890篇 |
农业经济 | 840篇 |
经济概况 | 3131篇 |
信息产业经济 | 45篇 |
邮电经济 | 586篇 |
出版年
2021年 | 97篇 |
2020年 | 174篇 |
2019年 | 260篇 |
2018年 | 2650篇 |
2017年 | 2432篇 |
2016年 | 1590篇 |
2015年 | 328篇 |
2014年 | 465篇 |
2013年 | 1524篇 |
2012年 | 850篇 |
2011年 | 2389篇 |
2010年 | 2186篇 |
2009年 | 1925篇 |
2008年 | 1970篇 |
2007年 | 2298篇 |
2006年 | 431篇 |
2005年 | 731篇 |
2004年 | 786篇 |
2003年 | 912篇 |
2002年 | 565篇 |
2001年 | 345篇 |
2000年 | 323篇 |
1999年 | 230篇 |
1998年 | 269篇 |
1997年 | 250篇 |
1996年 | 266篇 |
1995年 | 237篇 |
1994年 | 230篇 |
1993年 | 249篇 |
1992年 | 240篇 |
1991年 | 237篇 |
1990年 | 211篇 |
1989年 | 179篇 |
1988年 | 141篇 |
1987年 | 169篇 |
1986年 | 188篇 |
1985年 | 252篇 |
1984年 | 270篇 |
1983年 | 260篇 |
1982年 | 238篇 |
1981年 | 243篇 |
1980年 | 210篇 |
1979年 | 209篇 |
1978年 | 150篇 |
1977年 | 164篇 |
1976年 | 143篇 |
1975年 | 114篇 |
1974年 | 103篇 |
1973年 | 93篇 |
1972年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
1.
Gianvito Lanzolla Danilo Pesce Christopher L. Tucci 《Journal of Product Innovation Management》2021,38(1):90-113
Search and recombination are important mechanisms in the creativity phase of innovation. Digital transformation and the resulting pervasive digitalization of the innovation function have often been associated with increasing possibilities for search and recombination. In this paper, by systematically integrating the search and recombination literature with the literature on digitalization, we demonstrate that digitalization may engender new idiosyncratic tensions in the organizational antecedents of search and recombination and, by implication, in their likely outcomes. We propose that, depending on the interactions among the idiosyncratic tensions identified herein, knowledge recombination might spur very different outcomes, including knowledge layering, knowledge integration, knowledge grafting, or even no recombination at all (which we label “search for the sake of search”). These outcomes may not always be the initially planned desired outcomes. Finally, we provide implications of our integrative framework pertaining to product development and to organizing for innovation. 相似文献
2.
A new class of forecasting models is proposed that extends the realized GARCH class of models through the inclusion of option prices to forecast the variance of asset returns. The VIX is used to approximate option prices, resulting in a set of cross-equation restrictions on the model’s parameters. The full model is characterized by a nonlinear system of three equations containing asset returns, the realized variance, and the VIX, with estimation of the parameters based on maximum likelihood methods. The forecasting properties of the new class of forecasting models, as well as a number of special cases, are investigated and applied to forecasting the daily S&P500 index realized variance using intra-day and daily data from September 2001 to November 2017. The forecasting results provide strong support for including the realized variance and the VIX to improve variance forecasts, with linear conditional variance models performing well for short-term one-day-ahead forecasts, whereas log-linear conditional variance models tend to perform better for intermediate five-day-ahead forecasts. 相似文献
3.
In the U.S., virtually no new coal-fired power plants have been built in recent years. Both industry experts and academics seem to believe that no rational firm will build a new coal-fired plant. Will such a trend continue in the future? To provide insights into this question, we investigate the optimal decision of an electricity company with an irreversible and deferrable opportunity to build either a new coal-fired or natural gas-fired power plant as its new base-load resource. According to our real option analysis, the optimal decision depends on the location. In the case of the eastern U.S., it is optimal to choose a natural gas plant if a firm is given a choice among a new natural gas plant, a new coal plant and deferring the investment. However, contrary to the common sentiment in the industry and academia, building a new coal plant in the western U.S. is still more economical than building a new natural gas plant in the absence of emission pricing. Furthermore, introducing carbon pricing to western U.S. states, as California did, can substantially increase the probability that a firm will optimally choose a natural gas plant over a coal plant. 相似文献
4.
Greenwood Brad Adjerid Idris Angst Corey M. Meikle Nathan L. 《Journal of Business Ethics》2022,175(3):499-518
Journal of Business Ethics - Gender discrimination continues to plague organizations. While the advent of the Internet and the digitization of commerce have provided both a mechanism by which goods... 相似文献
5.
Journal of Consumer Policy - This paper considers whether a duty to provide consumers with disabilities with pre-contractual information in an accessible format, or in an otherwise personalised... 相似文献
6.
Journal of Consumer Policy - This study makes a novel attempt to disentangle the complex relationships between making sustainable purchasing choices and happiness, while also considering the key... 相似文献
7.
We examine risk profiles of the Portuguese stock market index component stocks using a novel approach to the classical capital asset pricing model (CAPM). Specifically, we estimate the CAPM via fractal regressions that allow studying the marginal effects at selected scales. In this way, we can reveal whether the risk is perceived differently by market participants with different investment horizons. Apart from the analysis itself, we provide new statistical insights into the issue of separating and comparing the scale-specific effects with statistical validity. We find several stocks deviating from an expected risk perception homogeneity across investment horizons. This is true for both analysed periods, i.e. before and after the global financial crisis. There are also several stocks that changed their relationship to the market portfolio in between, which has strong implications for possible portfolio construction. The proposed methodology is not limited to financial topics but can be used in any discipline where the scale-specific marginal effects might be of interest. 相似文献
8.
9.
Jorge Velez-Castiblanco Diana Londono-Correa Olandy Naranjo-Rivera 《Group Decision and Negotiation》2018,27(5):853-884
One of the questions associated with facilitated problem structuring is how the micro level of actors’ multimodal communications, contributes to the emergence of a macro level, framing the possibilities for action in a workshop. This paper shows a way to study this macro level, building the visualization of the conversations’ structure starting from a boundary games theory micro analysis of the interactions. Our empirical evidence comes from following a group of academic consultants working to define a value proposition for their activity. We focus on analyzing two out of nine workshops that were felt diametrically opposite in terms of facilitation and achievements. Moving from the micro towards an upward level, three configurations building the structure are identified—shifting, branching and converging. The work carried out allows us to: (1) visualize the structure of conversations in a problem structuring context, (2) highlight the role of multimodal communications in building the conversations and (3) construct an interpretation bridging the micro and macro readings of a workshop. This knowledge is useful for facilitators guiding the dynamic of a workshop and for researchers looking forward to understanding how micro level interactions build higher levels of the social phenomenon of intervention. 相似文献
10.
In this paper we investigate the long-run relationship between public debt and economic growth in the Spanish economy for the period 1851–2013. We develop a cliometric analysis of the debt–growth nexus using novel time series methods. We find some support for a negative relationship between both variables, but no clear evidence of a debt threshold. The estimated long-run elasticity in a one-break model shows a tendency to decrease over time from a nonsignificant 0.011 to a ?0.070, indicating that a 10 percentage increase in the public debt-to-GDP ratio is associated with 0.70 percentage points lower real economic growth. Indeed, we find for the first subsample (1851–1939) either “decoupling” or “saturation,” while in the second subsample (1940–2000) the long-run elasticity coefficient becomes negative and significant. When we extend our analysis up to 2013, we find a break in 1971 coinciding with the twilight of Franco’s dictatorship and the Spanish transition to democracy. 相似文献