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421.
  总被引:1,自引:0,他引:1  
This paper addresses the storage location assignment problem for outbound containers. The problem is decomposed into two stages. The yard bays and the amount of locations in each yard bay, which will be assigned to the containers bounded for different ships, are determined in the first stage. The exact storage location for each container is determined in the second stage. The problem in the first stage is solved by a mixed integer programming model, while a hybrid sequence stacking algorithm is applied to solve the problem in the second stage. Experimental results show that the proposed approach is effective and efficient in solving the storage location assignment problem for outbound containers.  相似文献   
422.
Joachim Kunert 《Metrika》1994,41(1):71-81
We consider the simple block model with random block effects, the block effects having variance b 2 =2;, with 2 the variance of the errors. It is assumed that the experimenter can vary the sizes of the blocks. The universal optimality of certain designs for all over all designs with the same number of blocks and the same number of observations is shown. It is of interest to note that if Balanced Incomplete Block Designs compete, then they perform equally well for =0 and for =, i.e. in the one way classification model and in the simple block model with fixed block effects, but they perform worse for every (0, ).The result is, however, theoretical in nature. It treats a situation which is not very likely to happen in practice. The interest lies in the fact that it provides a counterexample to a conjecture on optimality of designs in mixed models.  相似文献   
423.
We present a model of optimal stock pollution control with general distributed delays in the stock accumulation dynamics. Using generic functional forms and a distribution structure covering a wide range of distributions, we solve analytically the complex dynamic system that arises from the introduction of these distributed delays. From a theoretical standpoint, our contribution extends the dynamic optimization literature that focused on single discrete delays and develops an original method to address control problems written as mixed type functional differential equations with general kernels. Our results show the qualitative impact of acknowledging these distributed delays on the optimal pollution paths dynamics. We study analytically the properties of the dynamics and we identify the conditions for the occurrence of limit cycles. This theoretical work contributes to the design of efficient environmental policies in the presence of complex delays.  相似文献   
424.
    
In this paper, we analyze whether firms want to disclose their R&D knowledge for free in a mixed duopoly. We extend the paper by Poyago‐Theotoky (1999) on strategic R&D with endogenous spillovers by considering a mixed duopoly. We find that when spillovers of information are treated as endogenous the public firm fully discloses its information so long as R&D levels are chosen non‐cooperatively. The private firm does not disclose its information. This result holds if the private firm is foreign owned. We have extended the main model to consider the threat of entry faced by an incumbent public firm and whether it is privatized or not. We find that the public firm is not privatized and there is entry if the fixed entry cost is low enough.  相似文献   
425.
  总被引:1,自引:0,他引:1  
Thomas Schmelter 《Metrika》2007,65(2):183-193
In this paper optimal designs for the estimation of the fixed effects (population parameters) in a certain class of mixed models are investigated. Two classes of designs are compared: the class of single-group designs, where all individuals are observed under the same approximate design, and the class of more-group designs with the same mean number of observations per individual as before, where each individual can be observed under a different approximate design. It is shown that any design that is Φ-optimal in the class of single-group designs is also Φ-optimal in the larger class of more-group designs. The considered optimality criteria only have to satisfy mild assumptions, which is eg the case for the D-criterion and all linear criteria.  相似文献   
426.
We consider a problem of subsidy or tax policy for new technology adoption by duopolistic firms. The technology is developed in and transferred by a foreign country to the domestic country. It is free but each firm must expend some fixed set-up cost for education of its staff to adopt and use it. Assuming that each firm maximizes the weighted average of absolute and relative profits, we examine the relationship between competitiveness and subsidy or tax policies for technology adoption, and show that when firm behavior is not competitive (the weight on the relative profit is small), the optimal policy of the government may be taxation; when firm behavior is competitive (the weight on the relative profit is large), the optimal policy is subsidization or inaction and not taxation. However, if firm behavior is extremely competitive (close to perfect competition), taxation case re-emerges.  相似文献   
427.
    
This study develops an early warning system for financial crises with a focus on small open economies. We contribute to the literature by developing macro-financial dynamic factor models that extract useful information from a rich but unbalanced mixed frequency data set that includes a range of global and domestic economic and financial indicators. The framework is applied to several Asian countries—Thailand, South Korea, Singapore, Malaysia, the Philippines and Indonesia. Logit regression models that use the extracted factors and other leading indicators have significant power in predicting systemic events. In-sample and out-of-sample test results indicate that the extracted factors help to improve the predictive power over a model that uses only sufficiently long history indicators. Importantly, models that include the dynamic factors yield consistently better out-of-sample crisis prediction results for key performance measures such as a usefulness index, the noise to signal ratio, and AUROC.  相似文献   
428.
In some Asian countries, the pursuit of high yields often leads to excessive application of chemical fertilizer, negatively impacting the environment. We use the Choice Experiment approach to investigate the preferences of rice farmers in Taiwan for a potential Agri-environmental Scheme (AES), which would aim at an optimization of fertilizer use. We are especially interested in how such an AES would optimally be designed and whether it is possible to reduce its costs by offering the farmers lower payments in exchange for an eco-label. We find that farmers have a significant preference for an eco-label and would accept lower payments in exchange. They also prefer to retain some flexibility and keep some land out of the AES. Moreover, we also find that a share of the farmers would never join an AES.  相似文献   
429.
We consider deposit competition between two banks, where prior to competition one bank is subjected to a nationalization decision and the other bank chooses managerial incentives. The government who maximizes a modified form of social welfare (with greater weight on profit than depositor surplus) chooses only partial nationalization, which still hurts the rival private bank. But by offering deposit‐linked managerial incentives the private bank recovers its lost profit and induces even less nationalization, leaving social welfare unchanged. However, under interest rate competition for differentiated deposits the private bank offers profit‐linked managerial incentives while the other bank may be completely nationalized.  相似文献   
430.
We analyse the cost and benefit of outsourcing with adverse selection in a duopoly by comparing outsourcing with in‐house production in terms of the manufacturer’s expected profit. When two manufacturers faced with ex ante cost uncertainty compete in a differentiated duopoly, outsourcing brings about a benefit in terms of reduced competition, while it entails the cost of information rent. We show that the manufacturers always choose in‐house production in Cournot and Bertrand competition, when outsourcing and in‐house production follow the same ex ante cost distribution. When the manufacturers compete in Cournot fashion, the cost of information rent always exceeds the benefit of reduced competition under outsourcing. On the other hand, when they compete in Bertrand fashion, it is possible that even if the benefit of outsourcing exceeds the cost, both manufacturers cannot choose outsourcing.  相似文献   
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