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排序方式: 共有125条查询结果,搜索用时 218 毫秒
91.
92.
采用QuEChERS方法提取和净化鸡肉样品,建立测定磺胺类12种兽药残留的液相色谱-串联质谱(LC-MS/MS)检测方法。样品经乙腈和缓冲盐包SBEQ-CA8802-B提取,提取液经净化管净化后取上清液,旋转蒸发仪减压蒸干,溶解过膜,在电喷雾离子源多反应监测(MRM)模式下进行测定,基质外标法定量。结果表明,12种磺胺类药物测定方法的线性范围为0.01~0.20μg·kg-1,线性相关系数r均大于0.999,定量检出限为0.02~0.12μg·kg-1,10μg·kg-1添加范围的平均回收率为87.6%~101.0%,相对标准偏差为3.53%~11.60%。该方法操作简单,净化效果好,灵敏度高,能够快速有效地检测鸡肉中的磺胺类药物残留。 相似文献
93.
TERRENCE HENDERSHOTT DAN LI DMITRY LIVDAN NORMAN SCHÜRHOFF 《The Journal of Finance》2020,75(2):683-734
We examine the network of trading relationships between insurers and dealers in the over-the-counter (OTC) corporate bond market. Regulatory data show that one-third of insurers use a single dealer, whereas other insurers have large dealer networks. Execution prices are nonmonotone in network size, initially declining with more dealers but increasing once networks exceed 20 dealers. A model of decentralized trade in which insurers trade off the benefits of repeat business and faster execution quantitatively fits the distribution of insurers' network size and explains the price–network size relationship. Counterfactual analysis shows that regulations to unbundle trade and nontrade services can decrease welfare. 相似文献
94.
Wirtschaftsdienst - To address the distributional consequences of high inflation rates, measures are needed that target those most in need without distorting prices. The function of the price as... 相似文献
95.
In this paper, we address two questions. First, what determined the growth of GDP per worker in Indonesia from 1960 to 2014? We examine Indonesia’s economic performance, using a growth accounting framework. We show that economic growth during the Soeharto era after 1975 was mainly determined by an increase in capital accumulation. Negative growth in total factor productivity (TFP) during the Asian financial crisis was more noticeable in Indonesia than in comparable ASEAN countries. In Indonesia, the contribution of TFP growth turned persistently positive after 1999. Second, what are the key determinants of the GDP per worker differences between Indonesia and the United States? Using data from the recently updated Penn World Table database and employing a levels accounting method, we find that the gap in physical capital deepening between the two countries is of declining importance in explaining the gap in labour productivity between Indonesia and the United States. We then compare our findings with data from the World Bank’s Changing Wealth of Nations 2018. 相似文献
96.
R. JASON FABERMAN ANDREAS I. MUELLER AYŞEGÜL ŞAHIN GIORGIO TOPA 《Journal of Money, Credit and Banking》2020,52(Z2):355-391
We use a mix of new and existing data to develop the Aggregate Hours Gap (AHG), a novel measure of labor market underutilization. Our measure differentiates individuals by detailed categories of labor market participation and uses data on their desired work hours as a measure of their potential labor supply. We show that desired hours vary widely by demographics and detailed labor force status, and that the gap between desired and actual work hours is strongly positively correlated with reported search effort. The AHG suggests a more sluggish labor market recovery since the Great Recession than either the official unemployment rate or alternative measures of labor market underutilization. Modest amounts of underutilization among the part-time employed and a substantial degree of underutilization among those out of the labor force account for the disparity. The AHG also does well in accounting for wage movements over our sample period. 相似文献
97.
Florian Überbacher 《Journal of Management Studies》2014,51(4):667-698
Research on how new ventures (NVs) achieve legitimacy is fragmented and rests on taken‐for‐granted assumptions that require problematization. Following a systematic literature review, I identify five distinct perspectives on NV legitimation: an institutional perspective, a cultural entrepreneurship perspective, an ecological perspective, an impression management perspective, and a social movement perspective. After comparing and contrasting these perspectives, I synthesize them into a generative and integrative typology. Based on this typology, I develop a new research programme. The programme widens the extant scholarship agenda by challenging its shared assumptions and contributes to further integration of the literature by building bridges between perspectives. 相似文献
98.
Faruk Ülgen 《Journal of economic issues》2020,54(2):436-443
Abstract:In the light of recurrent systemic crises that financialized market economies have been experiencing since the 1980s, this article seeks to determine the conditions required for a regulatory framework apt to ensure financial stability. Drawing upon an Institutionalist Minskyian endogenous financial instability approach, the article studies the fragilities of liberalized finance and points to some policy alternatives able to lead to an alternative financial regulatory model that is consistent with macroeconomic stability. It argues that in a weak regulatory environment financial markets naturally generate instabilities that could turn into systemic crises. The analysis maintains that in order to deal with such crises, a tight supervision should be framed under the aegis of public authorities and suggests some rules to develop a relevant regulatory system through an open and democratic decision process. Two points then deserve particular attention: a macro-prudential approach that regards instability as a systemic (non-individual) issue, and a preventive approach that aims at preventing systemic-risk generating activities from taking control over the markets. 相似文献
99.
We trace the impact of formative experiences on portfolio choice. Plausibly exogenous variation in workers’ exposure to a depression allows us to identify the effects and a new estimation approach makes addressing wealth and income effects possible. We find that adversely affected workers are less likely to invest in risky assets. This result is robust to a number of control variables and it holds for individuals whose income, employment, and wealth were unaffected. The effects travel through social networks: individuals whose neighbors and family members experienced adverse circumstances also avoid risky investments. 相似文献
100.
SEBASTIAN GALIANI NORMAN SCHOFIELD GUSTAVO TORRENS 《Journal of Public Economic Theory》2014,16(1):119-156
We develop a stochastic model of electoral competition in order to study the economic and political determinants of trade policy. We model a small open economy with two tradable goods, each of which is produced using a sector‐specific factor (e.g., land and capital) and another factor that is mobile between these tradable sectors (labor); one nontradable good, which is also produced using a specific factor (skilled labor), and an elected government with the mandate to tax trade flows. The tax revenue is used to provide local public goods that increase the economic agents’ utility. We use this general equilibrium model to explicitly derive the ideal policies of the different socioeconomic groups in society (landlords, industrialists, labor, and skilled workers). We then use those ideal policies to model the individual probabilistic voting behavior of the members of each of these socioeconomic groups. We use this model to shed light on how differences in the comparative advantages of countries explain trade policy divergence between countries as well as trade policy instability within countries. We regard trade policy instability to mean that, in equilibrium, political parties diverge in terms of the political platforms they adopt. We show that in natural resource (land)–abundant economies with very little capital, or in economies that specializes in the production of manufactures, parties tend to converge to the same policy platform, and trade policy is likely to be stable and relatively close to free trade. In contrast, in a natural resource–abundant economy with an important domestic industry that competes with the imports, parties tend to diverge, and trade policy is likely to be more protectionist and unstable. 相似文献