全文获取类型
收费全文 | 23172篇 |
免费 | 4446篇 |
国内免费 | 38篇 |
专业分类
财政金融 | 2395篇 |
工业经济 | 2446篇 |
计划管理 | 3918篇 |
经济学 | 5705篇 |
综合类 | 1635篇 |
运输经济 | 147篇 |
旅游经济 | 124篇 |
贸易经济 | 4653篇 |
农业经济 | 3273篇 |
经济概况 | 3311篇 |
信息产业经济 | 4篇 |
邮电经济 | 45篇 |
出版年
2024年 | 141篇 |
2023年 | 506篇 |
2022年 | 479篇 |
2021年 | 539篇 |
2020年 | 909篇 |
2019年 | 1229篇 |
2018年 | 936篇 |
2017年 | 1147篇 |
2016年 | 945篇 |
2015年 | 976篇 |
2014年 | 1219篇 |
2013年 | 1705篇 |
2012年 | 1978篇 |
2011年 | 2222篇 |
2010年 | 2032篇 |
2009年 | 1671篇 |
2008年 | 1557篇 |
2007年 | 1447篇 |
2006年 | 1428篇 |
2005年 | 1351篇 |
2004年 | 719篇 |
2003年 | 496篇 |
2002年 | 410篇 |
2001年 | 335篇 |
2000年 | 208篇 |
1999年 | 150篇 |
1998年 | 116篇 |
1997年 | 94篇 |
1996年 | 81篇 |
1995年 | 46篇 |
1994年 | 52篇 |
1993年 | 63篇 |
1992年 | 77篇 |
1991年 | 94篇 |
1990年 | 37篇 |
1989年 | 41篇 |
1988年 | 20篇 |
1987年 | 11篇 |
1986年 | 7篇 |
1985年 | 16篇 |
1984年 | 22篇 |
1983年 | 15篇 |
1982年 | 21篇 |
1979年 | 8篇 |
1978年 | 8篇 |
1973年 | 7篇 |
1972年 | 7篇 |
1971年 | 6篇 |
1969年 | 9篇 |
1963年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 780 毫秒
11.
U.S. multinational corporations increasingly use intra-firm, cross-border research collaboration to disperse R&D across different countries. This paper investigates the implications of such collaboration on the abilities of firms to garner benefits from R&D tax incentives. We find that the association between R&D intensity and tax incentives is three to five times larger when firms have extensive cross-border collaboration connected to a country. We also find that the effect is stronger when local intellectual property protection is weaker and when local innovation resources are higher. Our results suggest that cross-border collaboration helps firms achieve more tax-efficient R&D investments both by reducing the nontax frictions posed by weak intellectual property protection and by increasing the nontax benefits of foreign R&D. 相似文献
12.
We study investor communication and stock comovement using a novel data set from an active online stock forum in China. We find substantial comovement among the returns of a stock and its “related stocks,” which are frequently discussed in the subforum dedicated to the given stock. Comovement is greater when the discussion of related stocks is more intensive. Further, the effect of communication on comovement is stronger for stocks associated with higher information uncertainty. Codiscussed stocks are more actively traded and experience more correlated trading. A trading strategy that exploits communication‐driven comovement generates abnormal returns. Our findings highlight the impact of investor communication on asset comovement. 相似文献
13.
当前小体积远端射频单元(Remote Radio Unit,RRU)主要是皮站级别的Pico-RRU,其重量和体积仍然难以满足掌上型的要求。为此,采用高集成度的AD9361芯片来实现长期演进(Long Term Evolution,LTE)宽带收发信机功能,配合时钟同步模块、放大器模块和控制接口电路等一起构建低成本的掌上型RRU。主要解决了基于AD9516的时钟同步、低相位噪声设计和高灵敏度接收机设计三个技术难点,成功实现了掌上型、高性能、低成本的设计目标。整个RRU样机尺寸为18 cm×10 cm×2 cm,质量约500 g,量产成本千元以内。测试表明,该RRU下行误差向量幅度(Error Vector Magnitude,EVM)小于3%,优于3GPP要求的8%;10 MHz带宽时上行接收机灵敏度优于3GPP要求的-93.5 dBm。 相似文献
14.
Using an extended LHARG model proposed by Majewski et al. (2015, J Econ, 187, 521–531), we derive the closed-form pricing formulas for both the Chicago Board Options Exchange VIX term structure and VIX futures with different maturities. Our empirical results suggest that the quarterly and yearly components of lagged realized volatility should be added into the model to capture the long-term volatility dynamics. By using the realized volatility based on high-frequency data, the proposed model provides superior pricing performance compared with the classic Heston–Nandi GARCH model under a variance-dependent pricing kernel, both in-sample and out-of-sample. The improvement is more pronounced during high volatility periods. 相似文献
15.
16.
Most studies on the predictability of moving average (MA) technical analysis use the discrete (buy/sell) trading recommendations. However, it is possibly incomplete or unreliable to explore the predictability of MA by only employing its generated trading signals. To further explore the forecastability of MA, we study its measurable impact on the stock market returns by using a conventional predictive regression framework. Our empirical study on the US stock market with respect to more detailed price information finds, (i) that the proposed predictor, MADP (MA based on daily prices) shows significant predictability in‐ and out‐of‐sample, and significantly outperforms the historical average (HA) benchmark as well as the MA based on monthly prices, (ii) that the predictability of MADP centers on the short‐term lags (within the most recent 10 days) and disappears when lags are beyond 20 days, and (iii) that the economic evaluation of the portfolios based on trading strategies confirms the superior performance of MADP with short‐term lags against the benchmark even though considering transaction costs. 相似文献
17.
18.
19.
蒋海 《广东金融学院学报》2003,18(6):5-9
目前理论界对金融监管存在着几个需要澄清的理论误区.中国金融监管存在着体制缺陷和信息黑洞,制约着监管效率的提高.因此,中国金融监管效率的提高,关键在于改革中国金融监管体制,在于形成金融监管当局提供有效监管的激励及其相应的制度安排. 相似文献
20.
This paper analyzes the issue costs and initial pricing of bonds in the international market. In particular, we investigate the determinants of three components of issue costs: underwriter fee, underwriter spread (the difference between the offering price and the guaranteed price to the issuer), and underpricing (the difference between the market price and the offering price). Total underwriter compensation increases with the bonds' credit risk and maturity, but it is insignificantly related to issue size. Interestingly, underwriters appear to price some issue characteristics directly (by adjusting the fee) and other characteristics indirectly (by setting the guaranteed price). The two compensation components (fee and spread) are negatively related to each other. We provide evidence that this trade-off is consistent with income tax considerations, as well as with two-tier pricing by underwriters. We find no evidence of underpricing. 相似文献