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91.
The availability of a stochastic repairable system depends on the failure behaviour and on repair strategies. In this paper,
we deal with a general repair model for a system using auxiliary counting processes and corresponding intensities which include
various degrees of repair (between minimal repair and perfect repair). For determining the model parameters we need estimators
depending on failure times and repair times: maximum likelihood (ML) estimator and Bayes estimators are considered. Special
results are obtained by the use of Weibull-type intensities and random observation times. 相似文献
92.
Weixiang Li Mingxi Li 《中国经济评论(英文版)》2004,3(1):18-23
The study is on a linear model of the relationship between the systematic risk and the micro-economic leverage and analyzed the data from the steel, energy source and chemical fibre industry listed companies in the Chinese stock market in 2002 and 2001. Using the linear regression method, empirical equations were found. The portfolio effect was shown so that some empirical evidence had been found to support the micro-economic leverage portfolio effect theory, which was that the listed companies balanced the operating and financial leverage to minimize the systematic risk. 相似文献
93.
The paper considers what can be inferred about experimental subjects’ time preferences for consumption from responses to laboratory
tasks involving tradeoffs between sums of money at different dates, if subjects can reschedule consumption spending relative
to income in external capital markets. It distinguishes three approaches identifiable in the literature: the straightforward
view; the separation view; and the censored data view. It shows that none of these is fully satisfactory and discusses the
resulting implications for intertemporal decision-making experiments.
JEL Classification C90, C91, D90, D91, D11, D12 相似文献
94.
We investigate the interplay between environmental policy, incentives to adoptnew technology, and repercussions on R&D. We study a model where a monopolistic upstream firm engages in R&D and sells advanced
abatement technology to polluting downstream firms. We consider four different timing and commitment regimes of environmental
tax and permit policies: ex post taxation (or issuing permits), interim commitment to a tax rate (a quota of permits) after
observing R&D success but before adoption, and finally two types of ex antecommitment before R&D activity, one with a unique tax rate (quota of permits), the other one with a menu of tax rates (permit
quotas). We study the second best tax and permit policies and rank these with respect to welfare. In particular, we find that
commitment to a menu of tax rate dominates all other policy regimes. 相似文献
95.
The paper analyzes the degree of output persistence in GDP in order toempirically discriminate between the Solow growth model, the perfect competition endogenous growth model and the imperfect competition endogenous growth model for the case of Austria. Wefind that a shock in the growth rate of output induces a permanent and larger effect on the level of GDP. This leads us to refute the Solow growth model and the perfect competition model of endogenous growth.We may not reject the imperfect competition growth model. 相似文献
96.
畜禽养殖业的环境影响及经济分析 总被引:2,自引:0,他引:2
畜禽业污染是我国农业面源污染的主要来源。本文估算了我国畜禽养殖业污染物排放量,阐述了畜禽养殖的环境影响,分析了畜禽污染内在的经济原因,并提出了防治畜禽污染的经济政策和措施,包括发展循环畜牧业、建设现代化的畜禽业物流体系、采纳各种环境经济手段、界定农村公共资源产权、实施优质畜禽产品品牌化战略、鼓励发展环保产业。 相似文献
97.
98.
多元化战略、经济绩效与资本结构——关于上市公司股权融资偏好解释 总被引:1,自引:0,他引:1
我国上市公司存在十分强烈的股权融资偏好,学术界一般将其原因归结为股权融资成本偏低。笔者研究则表明,融资成本因素并不能全部解释上市公司股权融资偏好。本文从企业多元化经营战略角度来剖析股权融资偏好。研究发现:企业多元化程度越低负债率越低,企业经济绩效越好;企业有动力降低负债率,采用股权融资。研究还发现,企业多元化战略已经构成融资决策的有效约束,股权融资偏好是上市公司的理性选择。 相似文献
99.
Certain manuals and computer programs mistakenly identify the mean with the constant in Box-Jenkins time series models. In this paper, it will be shown that (a) the mean and the constant have different values in autoregressive models, and (b) they have an algebraic and graphical relationship. 相似文献
100.
上市公司控制权的转移会改变投资者对目标公司的预期,从而引起目标公司股价的变化,进而使得目标公司股东的财富发生变化。本文采用事件研究法,分行业对2002年我国资本市场上第一大股东发生变更的目标方公司股东财富进行了实证研究。结果表明:对于整个资本市场而言,控制权转移能为目标公司带来显著的财富增加;而对于不同行业控制权转移的财富效应存在着较大的差别,只有原材料企业在公告日前可以获得显著的正财富效应,而工业企业和消费企业的财富效应并不明显。 相似文献