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111.
对于任何一种扩频PN码捕获系统来说,捕获性能在很大程度上取决于检测概率P_D和虚警概率P_(fao)在常用的平方律PN码捕获检测器中,P_D和P_(fa)的准确值可由相关器输出信号的概率密度函数(pdf)来估计.这篇文章提出用一种抽样数据方法来导出pdf.结果发现,对于码同步时,pdf是非中心X平方(Chi-square)分布,然而,对于码非同步时,pdf是中心X平方分布.利用这些分布,用广义的Q函数导出了P_D和P_(fa)的闭合表达式.这些结果对研究扩展频谱的工程师在系统设计中调整各种临界参数是非常有用的. 相似文献
112.
We study a model of centralized admissions in which schools are allowed to pre‐commit to admitting qualified applicants who rank them as their top choices over more qualified applicants who do not. A less popular school may use the pre‐commitment to steal applicants who otherwise would not choose it as their top choice (the stealing motive); a popular school may use the pre‐commitment to prevent its own applicants from being stolen (the preemptive motive). We identify the conditions for these two motives to exist. We also clarify the relationship of this phenomenon with that of pre‐arrangement of school places. 相似文献
113.
Contemporaneous observations on expected supply and on prices of post‐harvest futures contracts for corn are used to estimate expected demand relationships. These equations are used to estimate the prices of the post‐harvest contracts based on new supply estimates. Each estimate can be compared with a corresponding futures price, i.e. the market forecast. The differences help discern the market expectations about the expected demand for the new crop relative to historical experience, which can help support outlook analyses. We find that in recent years, a 100 million bushel change in the expected supply of corn results in about a 6 cent per bushel negative change in the price of December corn. The discussion also deepens understanding of the term ‘anticipatory prices’ as defined by Holbrook Working in his 1958 work. 相似文献
114.
We study competitive bidding with an explicit bid floor, motivated by minimum wage legislation and minimum labor standards. We derive the equilibrium strategies in, and compare the expected procurement costs among, the first‐price, second‐price, English, and Dutch auctions in a private‐cost model. For the English auction, we also consider a variant in which each seller can terminate the auction by jumping down to sell at the price floor. We find that the first‐price auction and the aforementioned jump‐down English auction lead to a lower expected procurement cost than under the second‐price auction and the standard English auction. 相似文献
115.
We consider a model in which schools and colleges compete for high-ability students, which are independently identified through a costly screening procedure. This independence creates a channel through which students' preferences affect the strategic interaction between schools: students with competing offers accept the most-preferred one, increasing the screening costs of unpopular schools. When preferences between schools are more heterogeneous, schools screen more, increasing the proportion of students with multiple offers, but paradoxically reducing the extent to which their preferences determine their outcomes. By observing the students' schools of origin, colleges can free-ride of the fierce competition that occurs during screening. 相似文献
116.
When and why does transformational leadership influence employee creativity? The roles of personal control and creative personality
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This study develops and tests a model of the underlying mechanisms linking transformational leadership and employee creativity using a sample of 240 matched middle‐level manager and front‐line supervisor dyads from a large foreign joint‐venture company in China. We propose that personal control and employee creative personality serve as a unique psychological mechanism and an important boundary condition to simultaneously influence the relationship between transformational leadership and employee creativity. Results of moderated‐mediation analyses provided support for our conceptual model, showing that transformational leadership was positively related to personal control, which also had a positive impact on employee creativity. Furthermore, creative personality was found to moderate the relationship between transformational leadership and personal control, which in turn, mediated the joint effect on employee creativity. Findings of this study provide insights into the research on leadership development and work design in HRM, which can inform human resource managers to design effective strategies and systems that can increase employees' creativity. 相似文献
117.
With the advances of the roles of business stories in marketing, two issues remain unclear: How do consumers evaluate story elements on services? Do usefulness and affect mediate the relationships between business story elements and brand attitude in services? Therefore, to answer these questions, this study conducted between-subjects experiments to investigate the roles of business story elements, usefulness, and affect in financial and restaurants services. The results indicate that the elements of authenticity, reversal, and humor are generally useful in engaging consumers’ usefulness and affect; besides, conciseness is useful in engaging consumers’ usefulness but is not for affect and brand attitude; finally, usefulness and affect are mediators of the relationship between business story elements and brand attitude. These findings provide a framework to design business story and investigate the mediation of usefulness and affect on the relationship between business story elements and brand attitude for services and practitioners. 相似文献
118.
Chieh-Peng Lin Yuan-Hui Tsai Sheng-Wuu Joe Chou-Kang Chiu 《Journal of Business Ethics》2012,105(1):83-93
Drawing on propositions from the signaling theory and expectancy theory, this study hypothesizes that the perceived corporate
citizenship of job seekers positively affects a firm’s attractiveness and career success expectation. This study’s proposed
research hypotheses are empirically tested using a survey of graduating MBA students seeking a job. The empirical findings
show that a firm’s corporate citizenship provides a competitive advantage in attracting job seekers and fostering optimistic
career success expectation. Such findings substantially complement the growing literature arguing that corporate citizenship
brings firms competitive advantages without solid evidence from the perspective of recruitment and human resources. Finally,
managerial implications and limitations of this study are also discussed. 相似文献
119.
This study explores how seller reputations affect auction prices and concludes that earlier findings may be biased due to the misspecification of seller reputation. This paper contributes to the literature by offering significant empirical evidence using Taiwanese internet auction data. Our study reveals that the influence of seller reputations on auction prices is significant, irrespective of the assumptions of linear or non‐linear relationships with price. However, failure to consider the non‐linear setting of seller reputation leads us to underestimate the impact of reputation when the seller's reputation score is low, but overestimates it when the seller's reputation becomes high. Using quantile regression, this study finds evidence of considerable differences in their impact on auction prices that are dependent on the distribution of price levels. 相似文献
120.
Across two studies, this research elucidates on which green messages in advertising are most effective in influencing the perceived effectiveness of green products by examining the moderating role of environmental consciousness. This study further considers a mechanism underlying the interaction between green messages and environmental consciousness on brand attitude with the perceived effectiveness of green products. The results show that when environmentally conscious individuals are exposed to abstract and distant temporal messages, they will report greater perceptions of a green product's effectiveness and brand attitude than for concrete and proximal temporal messages. In contrast, less environmentally conscious respondents will not have different responses to the abstract/concrete and distant/proximal temporal messages. Furthermore, the perceived effectiveness of a green product mediates the interaction between green messages and environmental consciousness for predicting brand attitudes. With an understanding of how environmentally conscious individuals evaluate green advertising, marketers can better understand how to promote their green products more effectively. 相似文献