全文获取类型
收费全文 | 749篇 |
免费 | 215篇 |
国内免费 | 4篇 |
专业分类
财政金融 | 35篇 |
工业经济 | 43篇 |
计划管理 | 222篇 |
经济学 | 72篇 |
综合类 | 87篇 |
运输经济 | 4篇 |
贸易经济 | 456篇 |
农业经济 | 22篇 |
经济概况 | 27篇 |
出版年
2024年 | 1篇 |
2023年 | 15篇 |
2022年 | 10篇 |
2021年 | 24篇 |
2020年 | 36篇 |
2019年 | 26篇 |
2018年 | 37篇 |
2017年 | 36篇 |
2016年 | 23篇 |
2015年 | 47篇 |
2014年 | 78篇 |
2013年 | 81篇 |
2012年 | 73篇 |
2011年 | 83篇 |
2010年 | 76篇 |
2009年 | 25篇 |
2008年 | 59篇 |
2007年 | 49篇 |
2006年 | 42篇 |
2005年 | 30篇 |
2004年 | 34篇 |
2003年 | 17篇 |
2002年 | 20篇 |
2001年 | 15篇 |
2000年 | 5篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有968条查询结果,搜索用时 15 毫秒
1.
Determination of Discrete Spectrum in a Random Field 总被引:1,自引:0,他引:1
We consider a two dimensional frequency model in a random field, which can be used to model textures and also has wide applications in Statistical Signal Processing. First we consider the usual least squares estimators and obtain the consistency and the asymptotic distribution of the least squares estimators. Next we consider an estimator, which can be obtained by maximizing the periodogram function. It is observed that the least squares estimators and the estimators obtained by maximizing the periodogram function are asymptotically equivalent. Some numerical experiments are performed to see how the results work for finite samples. We apply our results on simulated textures to observe how the different estimators perform in estimating the true textures from a noisy data. 相似文献
2.
当前我国货币政策传导机制不顺畅,其主要原因是:需求不足制约了中央银行货币供给,经济实体经济结构与金融经济结构的不对称阻碍了货币政策传导的信贷渠道,传导机制的机构活力不足,金融市场发育不成熟使货币政策实施的有效空间减少,等等。因此,必须认真研究提高货币政策传导效率的途径,使中央银行货币政策意图顺利实现。 相似文献
3.
We use line integral theory to lay out in a more general theoretical framework the conditions under which it is possible to measure with market data the welfare effects of a change in a nonmarket good. We present in detail a numerical method of measuring the value of nonmarket goods using market data, under either weak neutrality or weak complementarity. Our numerical method is more flexible than the existing analytical method because it can be used with any well-behaved Marshallian demand function, and can be used even when the willig condition does not hold. 相似文献
4.
Gaoliang Tian Hanyue Zhang Yirong Cao 《现代会计与审计》2006,2(2):40-47
This paper investigates the dividend signaling hypothesis, described here as the relationship between dividend changes and future earnings performance. We find that managers pursue different patterns in UK from that in US when making dividend policy. A positive and significant association between dividend changes and the growth of future earnings is observed in the immediately following year after dividend announced There isn't significant link in the longer future. These phenomena are caused by managers' near-eyesight in UK market. In addition, an interesting finding is that dividend decreases have larger negative influence on earnings growth than positive impact on earnings prospects of dividend increases. This is consistent with the infrequent occurrence of dividend reduction. 相似文献
5.
This paper presents a model of group formation based on the assumption that individuals prefer to associate with people similar to them. It is shown that, in general, if the number of groups that can be formed is bounded, then a stable partition of the society into groups may not exist. (A partition is defined as stable if none of the individuals would prefer be in a different group than the one he is in.) However, if individuals' characteristics are one-dimensional, then a stable partition always exists. We give sufficient conditions for stable partitions to be segregating (in the sense that, for example, low-characteristic individuals are in one group and high-characteristic ones are in another) and Pareto efficient. In addition, we propose a dynamic model of individual myopic behavior describing the evolution of group formation to an eventual stable, segregating, and Pareto efficient partition. Journal of Economic Literature Classification Numbers: C72, H41. 相似文献
6.
本文介绍了直接数字频率合成(DDS)芯片AD9852与可编程门阵列(FPGA)相结合采用数字方法实现中频线性相位调制(PM)及试验结果。 相似文献
7.
Pierre Perron 《Journal of econometrics》1996,70(2):317-350
We consider the normalized least squares estimator of the parameter in a nearly integrated first-order autoregressive model with dependent errors. In a first step we consider its asymptotic distribution as well as asymptotic expansion up to order Op(T−1). We derive a limiting moment generating function which enables us to calculate various distributional quantities by numerical integration. A simulation study is performed to assess the adequacy of the asymptotic distribution when the errors are correlated. We focus our attention on two leading cases: MA(1) errors and AR(1) errors. The asymptotic approximations are shown to be inadequate as the MA root gets close to −1 and as the AR root approaches either −1 or 1. Our theoretical analysis helps to explain and understand the simulation results of Schwert (1989) and DeJong, Nankervis, Savin, and Whiteman (1992) concerning the size and power of Phillips and Perron's (1988) unit root test. A companion paper, Nabeya and Perron (1994), presents alternative asymptotic frameworks in the cases where the usual asymptotic distribution fails to provide an adequate approximation to the finite-sample distribution. 相似文献
8.
9.
Hall and Miles (1990) suggest an approach of estimating default probabilities of banks using stock market information, and in this paper we apply an aggregated version of their approach to banking sectors around the world in both developed and emerging economies. We study the market’s assessment of the probability of systemic banking crises world wide over the last decade, including the Asian crisis 1997–1998. In addition, we investigate whether there is a relationship between the failure probability and institutional features of the actual banking sector. The quality of governance and the degree of law and order in a country is found to be significantly negatively related to the market based failure probabilities as is an explicit deposit insurance during periods of crisis. 相似文献
10.
弱势群体就业扶持政策研究 总被引:1,自引:2,他引:1
分析了当前我国弱势群体失业情况的严重性、特殊性及其原因 ,提出了构建我国弱势群体扶持政策的基本原则及标本兼治、着眼未来的就业扶持政策 相似文献