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11.
The authors have developed an efficient visualization system to gain insight into large collections of mineral elasticity data produced by an increasing number of both theoretical calculations and experiments. The system allows us to visualize multivariate elastic moduli (i.e., elastic constant tensors) and their variation with composition, pressure and temperature. Moreover, it supports visualization of elastic wave propagation in an anisotropic medium by rendering the wave velocity data, which are calculated as a function of propagation direction in a three-dimensional space. This paper describes the design, implementation and application of the visualization scheme we have developed for mineral elasticity. In particular, our scheme exploits a combination of parallel coordinates, star plot, scatter plot and polygon-surface rendering techniques, which are implemented using OpenGL, GLUI and C++. The result is a highly portable and flexible interactive visualization system. For illustration, the elastic properties of several important oxide and silicate minerals are successfully visualized as a function of pressure and temperature. 相似文献
12.
13.
This paper investigates second-best allocations where the government lacks full information about consumer types, and how such allocations may be implemented through notch schemes. Thus, we provide another rationale for notches in addition to that investigated by Blinder and Rosen (1985). We use a model of Blackorby and Donaldson (1988), extending their results to more general preferences and to more general tax-subsidy instruments (piecewise linear, rather than linear). We argue that observed policies are sometimes of this nature: In-kind subsidies that are available only if consumption equals or exceeds a particular amount have been used in practice, in housing, and medical care. 相似文献
14.
The domain and theories of marketing have been expanding since the origins of the discipline. Since the 1970s marketing science
has been organized around the exchange paradigm. Marketing concepts apply to all forms of exchange, whether it is goods, services,
personages, places or ideas, and whether it is between individuals, for-profit and nonprofit firms, governments and NGOs.
Marketing theories evolved from a firm oriented view to encompass the exchanging dyad. More recently the paradigm expanded
to a network level of explanation, and relational theories have come to the fore. But even as the field struggles to grasp
its new fields of explanation, there is a Kuhnian shift happening at its boundaries. The shift significantly bends the marketing
worldview as well as the theoretical tools and methodologies we use to study it. In this paper we develop a three-tiered explanation
of the emerging field of marketing—its subphenomena (consumer experiences and sensory systems), its phenomena (marketing networks),
and its superphenomena (sustainability and development). 相似文献
15.
There is a glaring paradox in all commonly used measures of poverty. The death of a poor person, because of poverty, reduces poverty according to these measures. This surely violates our basic intuitions of how poverty measures should behave. It cannot be right in concept that differentially higher mortality among the poor serves to reduce poverty. This article begins the task of developing poverty measures that are not perversely mortality sensitive. A family of measures is proposed that is an intuitive modification of standard poverty measures to take into account the fact that the rich live longer than the poor. 相似文献
16.
Ravi Kathuria Maheshkumar P. Joshi 《The International Entrepreneurship and Management Journal》2007,3(2):127-144
This paper focuses on the likelihood of firms adopting corporate entrepreneurship in response to the challenges and opportunities
presented by a change in their business environment shaped by the growth of the Internet. We further examined if firms are
willing to modify their existing systems in response to such a change. We also investigated the paths or modes of entrepreneurship
that firms would adopt when they perceive being entrepreneurial to be a viable response in light of a specific change in their
business environment. Finally, we identified the impediments that firms may need to overcome when adopting corporate entrepreneurship.
Results based on the data from senior executives lend support to our hypotheses. Managerial implications of the results are
discussed. 相似文献
17.
A number of futures markets use price limits which, in effect, preclude trade from occurring at prices outside certain exogenous bounds. Noting that such markets are characterized by heterogeneously informed traders, whereas previous work on price limits assumes symmetrically informed traders, we examine the effects of price limits in a setting where market participants are asymmetrically informed. We find that imposing price limits generally lowers the quality of information acquired in equilibrium, but lowers bid–ask spreads as well. Thus, depending on the relative weights placed by society on liquidity versus price efficiency, there may exist a set of price limits that are most efficient in achieving a trade-off between liquidity and informational efficiency. We perform empirical tests of some implications of the model using cross-sectional data on price limits. We find that price limits are strongly negatively related to both price volatility and trading volume. Though other explanations for our empirical findings cannot be ruled out, these results are not inconsistent with the model's implication that price limits should be tighter for contracts which offer greater profit potential for informed traders. 相似文献
18.
Although the airline industry has contributed to the globalization of the world economy, it is itself one of the least globalized sectors. This article identifies the governmental policies that have contributed to that outcome, and the economic and political forces that have gradually eroded regulatory barriers to competition and globalization in the last ten to fifteen years. Based on their airline industry policies in the mid-1990s, countries are classified as efficiency seekers (e.g., the United States), late reformers (e.g., Germany), and shelter providers (e.g., France), with the first embracing deregulation and globalization, the second adopting those policies somewhat slowly and reluctantly, and the third continuing to resist them in every possible way. Using Porter's “diamond” of international competitiveness, the article then explores the interaction of country characteristics and government policies to shape the competitiveness of U.S. and European airlines. The article concludes that, as a group, U.S. airlines are quite competitive, whereas in Europe the situation varies greatly between efficiency-seeking countries, such as the United Kingdom and the Netherlands, whose airlines have become very competitive, and shelter-providing countries, such as France, Italy, and Spain, whose airlines continue to be plagued by high costs and poor service. Because first-mover advantages can be significant as the airline industry globalizes, countries that postpone reforms are likely to find that the passage of time makes it harder to make their airlines internationally competitive, not merely in terms of cost but also in terms of nonprice dimensions, such as quality, service, and reliability. 相似文献
19.
This paper develops a unified empirical framework for describing the relative contribution of rural–urban and inland–coastal inequality to overall regional inequality in China during the 1980's and 1990's. The framework assesses rural–urban and inland–coastal inequalities from the same data set, presents results for a sufficiently long time period to transcend short-term fluctuations, allows for differential price changes, and applies a consistent notion of the contribution to inequality using a decomposition analysis. While the contribution of rural–urban inequality is much higher than that of inland–coastal inequality in terms of levels, the trend is very different. The rural–urban contribution has not changed very much over time, but the inland–coastal contribution has increased by several fold. The paper ends by investigating the role of labor migration in this outcome. J. Comp. Econom., December 1999, 27(4), pp. 686–701. Department of Agricultural, Resource, and Managerial Economics, 309 Warren Hall, Cornell University, Ithaca, New York 14853; International Food Policy Research Institute, 2033 K Street, NW, Washington, DC 20006. 相似文献
20.
Traded and Nontraded Goods and Real Wages 总被引:1,自引:0,他引:1
The paper explains most, if not all, observations made by the empirical literature regarding the behavior of skilled and unskilled real wages in the United States, especially those since 1980. Generalizing the Stopler–Samuelson theorem, the authors show that the nontraded sector is critical to explaining the effects of changes in the price of traded goods on relative and absolute wages. Factor‐intensities play their role as in the traditional Stolper–Samuelson model, but the output of the nontraded sector matters as well. Specifically, freer trade benefits capital and hurts both the skilled and unskilled labor if the import as well as the nontraded sectors contract. This is a new result to the literature on Stolper–Samuelson issues. 相似文献