Absolute neutrino masses: physics beyond SM, double beta decay and cosmic rays

Absolute neutrino masses provide a key to physics beyond the standard model. We discuss the impact of absolute neutrinos masses on physics beyond the standard model, the experimental possibilities to determine absolute neutrinos masses, and the intriguing connection with the Z-burst model for extreme-energy cosmic rays.Comment: 11 pages, 4 figures. Talk given by H. Paes at the NOON2001 workshop, ICRR, University of Tokyo, Kashiwa, Japan; 2 references update

Regional Growth and Development without Scale Effects – a Simple Model of Endogenous Formation of Regions

We present a semi-endogenous model of regional growth and development without scale effects. In this model of a small developing region the world growth rate of technical progress is given. Regional growth is driven by technological change induced by imitation. Imitation is determined by positive externalities from international trade. Regional factor endowments consist of immobile land and human capital which is perfectly mobile between regions. In order to study the endogenous formation of regions we introduce a second region and analyze a non symmetric decrease in international transaction costs. We find agglomeration in the region with better access to international markets, while the less favored region will realize a drop in income and technological capability. Two reactions can be identified. 1. For given resource endowments, the technological imitation process determines the final relative technological steady state positions. 2. Migration between the regions endogenously determines the final resource endowments of the regions. When reaching the no migration equilibrium, the relative development position, the population size and density of the region, as well as comparative advantages are endogenously determined.semi-endogenous growth, economic development, international trade, agglomeration, regional growth

Shortcuts in extra dimensions and neutrino physics

We discuss the possibility of sterile neutrinos taking shortcuts in extra dimensions, and the consequences for neutrino oscillations. This effect influences the active-sterile neutrino mixing and provides a possibility to accommodate the LSND evidence for neutrino oscillations together with bounds from accelerator and reactor experiments. We briefly comment on causality in such schemes.Comment: 4 pages, 3 figures, talk presented by H. Paes at SUSY06, UC Irvine, C

Measuring flexibility of multi-output firms: a primal and a dual measure

Industrial Organization,

FADS Gene Cluster Polymorphisms: Important Modulators of Fatty Acid Levels and Their Impact on Atopic Diseases

Long-chain polyunsaturated fatty acids (LC-PUFAs) play an important role in several physiological processes and their concentration in phospholipids has been associated with several complex diseases, such as atopic disease. The level and composition of LC-PUFAs in the human body is highly dependent on their intake in the diet or on the intake of fatty acid precursors, which are endogenously elongated and desaturated to physiologically active LC-PUFAs. The most important enzymes in this reaction cascade are the Delta(5) and Delta(6) desaturase. Several studies in the last few years have revealed that single nucleotide polymorphisms (SNPs) in the 2 desaturase encoding genes (FADS1 and FADS2) are highly associated with the concentration of omega-6 and omega-3 fatty acids, showing that beside nutrition, genetic factors also play an important role in the regulation of LC-PUFAs. This review focuses on current knowledge of the impact of genetic polymorphisms on LC-PUFA metabolism and on their potential role in the development of atopic diseases. Copyright (c) 2009 S. Karger AG, Base

Ships for the Seven Seas

Thomas R. Heinrich explores American shipbuilding from the workshop level to subcontracting networks spanning the Delaware Valley.Winner of the North American Society for Oceanic History's John Lyman Book AwardOriginally published in 1996. Sustained by a skilled work force and the Pennsylvania iron and steel industry, Philadelphia shipbuilders negotiated the transition from wooden to iron hull construction earlier and far more easily that most other builders. Between the Civil War and World War I, Philadelphia emerged as the vital center of American shipbuilding, constructing a wide variety of vessel types such as passenger liners, freighters, battleships, and cruisers.In Ships for the Seven Seas, Thomas R. Heinrich explores this complex industry from the workshop level to subcontracting networks spanning the Delaware Valley. He describes entrepreneurial strategies and industrial change that facilitated the rise of major shipbuilding firms; how naval architecture, marine engineering, and craft skills evolved as iron and steel overtook wood as the basic construction material; and how changes in domestic and international trade and the rise of the American steel navy helped generate vessel contracts for local builders. Heinrich also examines the formation of the military-industrial complex in the context of naval contracting.Contributing to current debates in business history, Ships for the Seven Seas explains how proprietary ownership and batch production strategies enabled late nineteenth-century builders to supply volatile markets with custom-built steamships. But large-scale naval construction in the 1920s eroded production flexibility, Heinrich argues, and since then, ill-conceived merchant marine policies and naval contracting procedures have brought about a structural crisis in American shipbuilding and the demise of the venerable Philadelphia shipyards