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71.
Charles M. Sheppard 《Process Safety Progress》1992,11(4):229-237
The behavior of an open system is modeled. Thus, for special cases, the void fraction is predicted as a function of location and time. The open system may be an open vessel or a vessel with an open relief device. A single governing equation is derived based on combining the material and energy balances with the churn-turbulent drift flux relationship and assuming no radial gradients. This partial differential equation is not solved. It is, however, bounded by homogeneous and all vapor venting. These special cases are solved. In homogeneous venting the key variable is time. In all vapor venting under pseudo-steady-state conditions the key variable is location. The solution of the partial differential equation is also discussed. Under pseudo-steady-state and churn-turbulent conditions, the open system is modeled. The minimum void fractions (corresponding to a maximum liquid inventory) with all vapor venting, for vertical, horizontal, and spherical vessels are predicted and compared. Analytical expressions for the local and average void fractions in a vertical vessel and non-unity distribution parameters are presented. Void fraction profiles are compared for three cases: 1. vertical cylinders with distribution parameters (Co values) of unity and 1.5, 2. horizontal and vertical cylinders with varying L/D ratios, and 3. spheres with inscribed vertical cylinders having constant gas production to bubble rise ratio (Ψ′ value). The vertical cylinder average void fraction for non-unity distribution parameters can now be calculated analytically. The horizontal cylinder average void fraction predicted by turning it upright results in an over prediction of at most 4%. The sphere average void fraction predicted via an inscribed vertical cylinder, with the same Ψ′ value, is consistenly high by at most 8%. 相似文献
72.
Charles Trappey 《心理学和销售学》1996,13(5):517-530
A meta-analysis is used to demonstrate the ineffectiveness of subliminal advertising to influence the consumer's decision between alternatives. A review of narrative reviews is provided to illustrate that sample size and effect size is seldom used as the basis for evaluating whether subliminal marketing stimuli are an effective means for influencing consumer choice behavior. The results of the meta-analysis indicate that there is very little effect. The resulting coefficient had a value r=0.0585, which places the effectiveness of subliminal advertising on choice between the impact of aspirin on heart attacks and the relationship between alcohol abuse and a tour of duty in Vietnam (Rosenthal, 1990). © 1996 John Wiley & Sons, Inc. 相似文献
73.
74.
Charles Shi Kuntara Pukthuanthong Thomas Walker 《Contemporary Accounting Research》2013,30(1):356-387
This study examines whether IPO disclosure requirements mandated by countries’ securities laws are associated with variation in IPO underpricing in international IPO markets. Our empirical analysis uses a unique sample of 6,025 IPOs from 34 countries over the period from 1995 to 2002. We show for the first time that the stringency of disclosure requirements for IPO prospectuses is negatively associated with the extent of IPO underpricing, after controlling for various country‐ and firm‐level determinants of underpricing. Moreover, we find that the disclosure effect on IPO underpricing is moderated by the extent of a country’s capital market integration. Taken together, our findings are consistent with the view that increased disclosure regulation appears to reduce IPO underpricing and hence the cost of equity, and that institutional factors such as capital market integration play an important role in understanding the economic consequences of disclosure regulation in international IPO markets. 相似文献
75.
Carmen Hubbard John Davis Siyi Feng David Harvey Anne Liddon Andrew Moxey Mercy Ojo Myles Patton George Philippidis Charles Scott Shailesh Shrestha Michael Wallace 《EuroChoices》2018,17(2):19-26
There is little doubt that Brexit would have significant implications for UK agriculture, a sector with strong trade links to the EU and strong reliance on CAP income support. This article reports preliminary results from employing a Computable General Equilibrium Model, a Partial Equilibrium Model and Farm Level Models to explore selected trade and domestic policy scenarios post‐Brexit. These allow for the estimation of changes in producer prices, production and farm incomes against a baseline scenario of continued EU membership. Under a Free Trade Agreement with the EU, agricultural impacts are relatively modest. By contrast, unilateral removal of import tariffs has significant negative impacts on prices, production and incomes. Adoption of the EU's WTO tariff schedule for all imports favours net importers (e.g. dairy) and harms net exporters (e.g. sheep). Given the strong dependence of most UK farms on direct payments, their removal worsens negative impacts of new trade arrangements and offsets positive impacts. Impacts vary across different types and sizes of farm, but also regionally. However, the period of adjustment to new trade and domestic policy conditions may prove very challenging for a large number of farm businesses. 相似文献
76.
Measuring rural consumers’ willingness to pay for quality labels using experimental auctions: the case of aflatoxin‐free maize in Kenya 下载免费PDF全文
Hugo De Groote Clare Narrod Simon C. Kimenju Charles Bett Rosemarie P. B. Scott Marites M. Tiongco Zachary M. Gitonga 《Agricultural Economics》2016,47(1):33-45
Aflatoxins are a common health hazard in tropical countries, especially in rural areas. New methods to reduce aflatoxin levels in food staples, as well as cheaper test methods, are being developed, but consumers’ willingness to pay (WTP) for these improvements is unknown. A survey was conducted with a representative sample of rural consumers (1,344 in total, 63% women) in all major maize‐production zones of Kenya. The survey included an experimental auction with maize products of different qualities. The results showed that many rural consumers were aware of aflatoxins, but few understood their health risks. Respondents were willing to pay a premium for maize tested for aflatoxins and labeled, but asked a high discount for maize that was visibly contaminated with moldy grain. The premium was higher for respondents with education and in regions with aflatoxicosis outbreaks. Knowledge of aflatoxins substantially reduced the overall WTP, but did not increase the WTP for tested maize. Welfare analysis indicates that mandatory testing would result in substantial benefits if the cost of testing can be lowered to below the premium. 相似文献
77.
Richard P. Nielsen Charles McQueen Angela B. Nielsen 《American journal of economics and sociology》1976,35(2):149-160
Abstract . Hypothesized direct and interaction relationships among the dependent variable willingness to pay more taxes for support of live artistic communications media and the independent variables of past attendance, education, income, leisure time, and liberalism-conservatism are tested. Past enjoyment probably makes people more favorable to tax support. Social policy implications of the results are discussed. 相似文献
78.
Charles Simkins 《Development Southern Africa》1984,1(2):142-152
Based on a synthetic sample of Black households and information about employment and incomes, a provisional account is given of the distribution of income between households and poverty in the homelands in 1960, 1970 and 1980. It is concluded that while the majority of households remained poor in 1980 (80 per cent below the urban minimum living level), households above the 30th percentile of the distribution in 1980 were considerably better off in real terms than households at the corresponding percentile in 1960. Below the 30th percentile, however, relative deterioration has taken place and below the 15th percentile absolute deterioration. The massive expansion of homeland population by incorporation of metropolitan townships, resettlement and other immigration, complicates the interpretation of these findings. 相似文献
79.
This article presents a policy research agenda for the promotion of farm/non‐farm linkages in South Africa. Our premise is that promoting the participation of small farms and small agroindustrial businesses in these linkages will have a strong impact on employment and income for the poor. We argue that there is potential for growth in linkages. The first question of the policy research agenda concerns the current status of linkages, and we note the dearth of research on this. The second question concerns the constraints on and prospects for promoting linkages from the demand side, and the third question treats the same concerns from the supply side. The fourth question is rooted in the duality in South Africa's non‐farm and farm sectors, and asks whether, and how, small and large agroindustrial businesses and farms will compete or relate in ‘business linkages’ that can benefit intersectoral linkages. The final question concerns the impacts of and alternatives for policies and programmes to spur linkages. 相似文献
80.
Charles L Evans 《Business Economics》2010,45(3):152-157
Headline employment numbers have been consistent with previous recoveries from recession. Behind the headlines, however, there are troubling data that suggest that the recovery of labor markets is weaker than what would be suggested by prior experience. In particular, labor force participation is weaker than expected, and the duration of unemployment has been longer. This paper describes the dimensions of the problems, their implications, and issues concerning whether the U.S. Federal Reserve could have done more to forestall them—particularly with respect to its Large Scale Asset Purchases program. 相似文献