International Patent Pattern and Technology Diffusion

The paper focuses on the impact of business related R&D spending on input factor productivity (IFP) using international patent applications as a technology diffusion channel. Considering the relationship amongst research and productivity, international patent pattern reflect the link between the source (R&D) and the use (IFP). To estimate patent related spill-over effects, I use the estimation techniques developed and proposed by Kao and Chiang (1998) in order to deal with nonstationary and cointegration and to obtain reliable coefficients. I find that patent related foreign R&D spillover effects are present and that impact on labor productivity for Non-G7 countries is higher due to foreign than domestic R&D activities.Productivity, R&D, Technology Diffusion, Nonstationary Panels

Agglomeration, Migration and Tax Competition

The paper focuses on tax competition and international migration in R&D sectors as agglomeration forces and trade restrictions are present. Core countries in economically integrating regions adapt tax rates to keep their industrial status quo. Unlike the often discussed “race to the bottom” result, tax rates are increased and the provision of public goods is maintained. Additionally, tax rates that redistribute between mobile and immobile labor lead to a tax burden that favors mobile labor. As economic integration continues, the cutback of factor mobility restrictions for skilled labor supports economic development in core countries at the expense of periphery countries.Economic Geography, Agglomeration, Migration, Tax Competition

Evolution of Feedback Loops in Oscillatory Systems

Feedback loops are major components of biochemical systems. Many systems show multiple such (positive or negative) feedback loops. Nevertheless, very few quantitative analyses address the question how such multiple feedback loops evolved. Based on published models from the mitotic cycle in embryogenesis, we build a few case studies. Using a simple core architecture (transcription, phosphorylation and degradation), we define oscillatory models having either one positive feedback or one negative feedback, or both loops. With these models, we address the following questions about evolvability: could a system evolve from a simple model to a more complex one with a continuous transition in the parameter space? How do new feedback loops emerge without disrupting the proper function of the system? Our results show that progressive formation of a second feedback loop is possible without disturbing existing oscillatory behavior. For this process, the parameters of the system have to change during evolution to maintain predefined properties of oscillations like period and amplitude.Comment: Proceedings of the 2009 FOSBE conference in Denver, CO, USA. 4 page

Agglomeration, Migration and Tax Competition

This paper focuses on tax competition and international migration in R&D sectors as agglomeration forces and trade restrictions are present. Economic integration forces industrialized countries to adapt their tax rates in order to keep their industrial status quo. Unlike the often discussed "race to the bottom" result, taxes are increased and the provision of public goods is maintained. It is also proven that taxes that redistribute between mobile and immobile labor lead to a tax burden that favors mobile labor. As integration continues, the cutback of factor mobility restrictions supports economic development in industrialized countries at the expense of structurally backward regions. --Economic Geography,Agglomeration,Migration,Tax Competition

Agglomeration economies and clustering: Evidence from German firms

The paper quantifies the impact of agglomeration economies on the clustering of German firms. Therefore, I use the 2006 Innobarometer survey, which focuses on cluster characteristics and activities of German firms, to empirically identify agglomeration economies derived from the New Economic Geography and Marshall externalities. At the industry specific level, I find that within-industry spillovers are important for German low-tech firms but not for high-tech firms or knowledge intensive firms. At the department level, Marshall externalities such as hiring skilled labor and technological spillover effects are empirically confirmed for some departments like Human Resources or R&D but rarely for others like Production

Thermodynamically Stable One-Component Metallic Quasicrystals

Classical density-functional theory is employed to study finite-temperature trends in the relative stabilities of one-component quasicrystals interacting via effective metallic pair potentials derived from pseudopotential theory. Comparing the free energies of several periodic crystals and rational approximant models of quasicrystals over a range of pseudopotential parameters, thermodynamically stable quasicrystals are predicted for parameters approaching the limits of mechanical stability of the crystalline structures. The results support and significantly extend conclusions of previous ground-state lattice-sum studies.Comment: REVTeX, 13 pages + 2 figures, to appear, Europhys. Let

CO adsorption on metal surfaces: a hybrid functional study with plane wave basis set

We present a detailed study of the adsorption of CO on Cu, Rh, and Pt (111) surfaces in top and hollow sites. The study has been performed using the local density approximation, the gradient corrected functional PBE, and the hybrid Hartree-Fock density functionals PBE0 and HSE03 within the framework of generalized Kohn-Sham density functional theory using a plane-wave basis set. As expected, the LDA and GGA functionals show a tendency to favor the hollow sites, at variance with experimental findings that give the top site as the most stable adsorption site. The PBE0 and HSE03 functionals reduce this tendency. In fact, they predict the correct adsorption site for Cu and Rh but fail for Pt. But even in this case, the hybrid functional destabilizes the hollow site by 50 meV compared to the PBE functional. The results of the total energy calculations are presented along with an analysis of the projected density of states.Comment: 32 pages, 6 tables, 3 figures. (Re)Submitted to Phys. Rev. B; LDA results added in the tables; minor changes in the tex

Industrial Agglomeration and Economic Development

The paper outlines a static equilibrium model, which analyses the economic development in a two-country case by considering interregional migration in R&D-sectors. The effects of migration and firm decisions on both industrial agglomeration and economic development will be shown: lock-in-effects and free market entry will lead to a concentration of firms. In addition, the consideration of fundamental and secondary research activity leads to a higher number of firms and products by means of cost reduction and spillover effects. The resulting demand of unskilled and skilled labor will be met by sectoral and interregional migration. This reinforces the concentration of economic activity and leads to a higher degree of specialization and economic development. The formation of single equilibria is shown under consideration of exogenous shocks: diminishing transportation cost will turn economies, originally equally endowed and with the same economic structure, to spatial concentration and uneven economic development

The Structure of Barium in the hcp Phase Under High Pressure

Recent experimental results on two hcp phases of barium under high pressure show interesting variation of the lattice parameters. They are here interpreted in terms of electronic structure calculation by using the LMTO method and generalized pseudopotential theory (GPT) with a NFE-TBB approach. In phase II the dramatic drop in c/a is an instability analogous to that in the group II metals but with the transfer of s to d electrons playing a crucial role in Ba. Meanwhile in phase V, the instability decrease a lot due to the core repulsion at very high pressure. PACS numbers: 62.50+p, 61.66Bi, 71.15.Ap, 71.15Hx, 71.15LaComment: 29 pages, 8 figure