A convolution estimate for two-dimensional hypersurfaces

Given three transversal and sufficiently regular hypersurfaces in R^3 it follows from work of Bennett-Carbery-Wright that the convolution of two L^2 functions supported of the first and second hypersurface, respectively, can be restricted to an L^2 function on the third hypersurface, which can be considered as a nonlinear version of the Loomis-Whitney inequality. We generalize this result to a class of C^{1,beta} hypersurfaces in R^3, under scaleable assumptions. The resulting uniform L^2 estimate has applications to nonlinear dispersive equations.Comment: 21 pages, 1 figur

Renewables energies industry in the current investment context

The current shifts in the global energies market lead the expected change in the long term from traditional energies sources, like fossil fuels, to renewable energies sources, e.g. sun, wind, water, energetic wood etc. The major commitments are: sustainability, productivity, smart energy grids and functional energy systems, industrial ecology, green chemistry, bio mimicry, green nanotechnology. The most important investment criterion relies upon efficiency: energy return of invested energy (EROIE), but there are also other relevant issues such as: policies to support RE, e.g. green certificates, legal issues to exploit resources or the capital costs and operational & maintenance costs. Romania’s best RE potential lies in biomass, hydro and wind, but still is a lot to capitalize on geothermal and solar photovoltaic or in conjoint projects between private investors and authorities, especially in waste incineration power plants.Renewable/green energies, CO2 emissions, EROIE, capital costs, O&M costs

Developing Performance-Centered Systems for Higher Education

The experience in developing performance-centered systems for higher education has improved significantly, and practitioners have made considerable progress in elaborating a methodology. This paper discusses the convergence of thinking among various disciplines in analysis and design methodologies, and describes the key elements of the new-emerged performance support engineering development methodology. These are important for designing web-based systems, information systems, and knowledge management systems in higher education.performance-centered systems, web-besd systems, information systems, knowledge management systems, methodology, higher education

Outsourcing the Business Services

The nowadays international market of outsourcing services is relatively mature and with age comes wisdom ... Thus, on a grown market, choosing to outsource services can not only be justified by the strive to reduce costs but it aims to meeting more advanced objectives as accurate alignment with business strategies of the enterprise. As a result, outsourcing has reached new forms of expression that can help the enterprises to gain competitive advantage. In the context of a grown market, a new concept appears, namely the multisourcing which it refers to the outsourcing model of the future [1] that businesses must prepare to accept and use. This concept or model of the future refers to working with several suppliers, which are competitors in a spirit of trust and teamwork, in a collaborative process to maximize the benefits associated with outsourcing process.Business Outsourcing, Audit, Economic and Financial Analysis, Information Technology Outsourcing