Differentiability of the Solutions of a Semilinear Abstract Cauchy Problems With Respect to Parameters

The Frechet di®erentiability with respect to a parameter q of the solutions z(t; q) of Cauchy problems of the form d/dt z(t) = A(q)z(t) + F(q; t; z(t)) is analyzed. Su±cient conditions on the operator A(q) and on F are derived and the corresponding sensitivity equations for the Frechet derivative Dqz(t; q) are found.Fil: Spies, Ruben Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; Argentin

Network and Border Effects: Where Do Foreign Multinationals Locate in Germany?

This study assesses the determinants of location choices of foreign multinational firms at the level of German federal states. Adjacency and existing firm networks are assumed to influence the investors’ profits in a given location by overcoming informational disadvantages when entering the new market. A conditional and a nested logit model resemble the structure of the location choice process of individual investors well. By using affiliate-level data between 1997 and 2005, the results confirm that firms react positively to local demand, a common border and existing firm networks, while unit labour costs exhibit the expected negative impact. In the sectoral estimations, it is shown that these effects vary in their relevance among manufacturing and service affiliates, and between upstream and downstream activities.Location choice, multinational firms, nested logit model

Variables in turbine erosion

Study of impact erosion in the operation of turbomachinery is undertaken to predict the results for particular designs. The test program investigates the effects of turbine stator blade shape, rotor blade shape, and variations in test conditions

Protein-nucleic acids interactions: new ways of connecting structure, dynamics and function

No abstract available

Enlarging the EMU to the East: What Effects on Trade?

The purpose of this paper is to assess the implications of the Economic and Monetary Union (EMU) accession of eight Central and Eastern European Countries (CEECs) on their share in EMU-12 imports. Overcoming biases related to endogeneity, omitted variables and sample selection, our results indicate that the common currency has boosted intra-EMU imports by 7%. Under the assumption that the same relationship between the explanatory variables and imports will hold for EMU-CEEC trade, we are able to predict the future impact of the Euro. Our findings suggest that except for the least integrated countries, Poland, Latvia and Lithuania, all CEECs can expect increases in the EMU-12 import share.Central and Eastern European countries, Euro area enlargement, gravity model, panel estimation

Transport Costs in International Trade

This paper claims that distance alone is a poor proxy for international transport costs in gravity equations. We develop a theoretical framework with a manufacturing and a transport sector, where the level of manufacturing exports determines the demand for transport. Above a certain threshold, transport service suppliers find it profit-maximizing to invest into advanced transport technology, which lowers their marginal costs and as a consequence, transport prices. Transport costs therefore vary with the distance between the two locations, and with the endogenous decision to invest in a more efficient technology. We tackle the biases in traditional gravity estimates by using newly collected data on transport prices from UPS and by applying instrument variable estimation techniques. Our results reveal that distance affects trade beyond the transport cost channel. Transport prices, in turn, are influenced by the distance and by the exports between two countries. We find that trading partners with 10% more exports enjoy 0.7% lower transport prices.

The reachability of contagion in temporal contact networks: how disease latency can exploit the rhythm of human behavior

The symptoms of many infectious diseases influence their host to withdraw from social activity limiting their own potential to spread. Successful transmission therefore requires the onset of infectiousness to coincide with a time when its host is socially active. Since social activity and infectiousness are both temporal phenomena, we hypothesize that diseases are most pervasive when these two processes are synchronized. We consider disease dynamics that incorporate a behavioral response that effectively shortens the infectious period of the disease. We apply this model to data collected from face-to-face social interactions and look specifically at how the duration of the latent period effects the reachability of the disease. We then simulate the spread of the model disease on the network to test the robustness of our results. Diseases with latent periods that synchronize with the temporal social behavior of people, i.e. latent periods of 24 hours or 7 days, correspond to peaks in the number of individuals who are potentially at risk of becoming infected. The effect of this synchronization is present for a range of disease models with realistic parameters. The relationship between the latent period of an infectious disease and its pervasiveness is non-linear and depends strongly on the social context in which the disease is spreading.Comment: 9 Pages, 5 figure

Trade Effects of the Europe Agreements

The eastern enlargement of the European Union (EU) brought and will bring full membership to countries whose trade barriers with the EU had to a large extent already been removed under Free Trade Agreements (FTAs) during the 1990s. We employ a theory-based new version of a gravity equation, whose specification allows for an assessment of the impact of the arrangements on extra- and intra-group imports. We find robust evidence that the agreements have substantially increased intra-group trade, in the case of the Czech and Slovak Republic at the expense of the Rest of the World (ROW).Free Trade Agreements; Gravity equation; Central and Eastern Europe; Panel data

Enlarging the EMU to the east: What effects on trade?

The purpose of this paper is to assess the implications of the Economic and Monetary Union (EMU) accession of eight Central and Eastern European Countries (CEECs) on their share in EMU-12 imports. Overcoming biases related to endogeneity, omitted variables and sample selection, our results indicate that the common currency has boosted intra-EMU imports by 7%. Under the assumption that the same relationship between the explanatory variables and imports will hold for EMU-CEEC trade, we are able to predict the future impact of the euro. Our findings suggest that except for the least integrated countries, Poland, Latvia and Lithuania, all CEECs can expect increases in the EMU-12 import share.Central and Eastern European countries, Euro area enlargement, gravity model, panel estimation