STATE/REGIONAL ECONOMIC MODELS FOR LONG-RANGE ENERGY PLANNING

Community/Rural/Urban Development, Resource /Energy Economics and Policy,

THE EMPTYING OF THE COUNTRYSIDE AND ITS COST

Community/Rural/Urban Development,

MINNESOTA ENERGY-ECONOMIC INFORMATION SYSTEM

The energy-economic impact forecasting system presented here is a modular approach to both economic modeling and information systems development. A set of eleven modules--market, investment, demand, production, (input-output), employment, value added, labor force, population, household, fiscal, and ecologic--provides the data base and programming routines for simulating the state (or a substate regional) economy. An additional set of government function modules, including energy and environmental management, provides an auxiliary data base and forecasts for state and local government agencies. This series of data modules and related computer programs, locally called SIMLAB, is organized as a readily accessible regional impact simulation system.Community/Rural/Urban Development,

How to differentially detect potentially risky human papilloma virus strains in the human population?

The human papillomavirus (HPV) represents one of the most common sexually transmitted infections, knowing more than 100 viral types that, in relation to their oncological pathogenesis, are classified into types of high and low oncological risk. Cervical cancer is the second leading cause of death from malignant neoplasms in women. HPV can often cause warts. Most types of this virus are harmless, but a percentage of them are associated with an increased risk of cancer. These types are born from the genitals and are acquired through sexual contact with an engaged partner. Cervical cancer is the second leading cause of death from malignant neoplasms in women. HPV infection is responsible for various lesions in different areas of the body. Common warts are the most frequent. They consist of whitish papillomatous lesions that can be in any area, oral mucosa, genital mucosa, etc. Most people infected with the genital human papillomavirus are only carriers. It usually has no symptoms and goes away on its own, without causing serious health problems. There is no cure for HPV, but there are treatments for the health problems that some types of HPV can cause, such as genital warts and cervical cancer. Thanks to cytology and histopathology, it can be detected and treated promptly, reducing the impact of this disease. In addition, there are vaccines that promise to reduce this cancer, especially in countries with the highest number of cases. The virus can remain in the body, even after receiving treatment for genital warts. This means that HPV can still be transmitted to sexual partners, despite not having physical manifestations of it. This work will present the bases for the differential detection between the riskiest HPV strains: HPV-18 and HPV-16 through their detection using the amazing idea of Kary Mullis: Polymerase Chain Reaction

Collapse of the Gd3+Gd^{3+} ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeFe4P12CeFe_{4}P_{12}

Experiments on the $Gd^{3+}$ Electron Spin Resonance (ESR) in the filled skutterudite $Ce_{1-x}Gd_{x}Fe_{4}P_{12}$ ($x \approx 0.001$), at temperatures where the host resistivity manifests a smooth insulator-metal crossover, provides evidence of the underlying Kondo physics associated with this system. At low temperatures (below $T \approx K$), $Ce_{1-x}Gd_{x}Fe_{4}P_{12}$ behaves as a Kondo-insulator with a relatively large hybridization gap, and the $Gd^{3+}$ ESR spectra displays a fine structure with lorentzian line shape, typical of insulating media. The electronic gap is attributed to the large hybridization present in the coherent regime of a Kondo lattice, when Ce 4f-electrons cooperate with band properties at half-filling. Mean-field calculations suggest that the electron-phonon interaction is fundamental at explaining the strong 4f-electron hybridization in this filled skutterudite. The resulting electronic structure is strongly temperature dependent, and at about $T^{*} \approx 160 K$ the system undergoes an insulator-to-metal transition induced by the withdrawal of 4f-electrons from the Fermi volume, the system becoming metallic and non-magnetic. The $Gd^{3+}$ ESR fine structure coalesces into a single dysonian resonance, as in metals. Still, our simulations suggest that exchange-narrowing via the usual Korringa mechanism, alone, is not capable of describing the thermal behavior of the ESR spectra in the entire temperature region ($4.2$ - $300$ K). We propose that temperature activated fluctuating-valence of the Ce ions is the missing ingredient that, added to the usual exchange-narrowing mechanism, fully describes this unique temperature dependence of the $Gd^{3+}$ ESR fine structure observed in $Ce_{1-x}Gd_{x}Fe_{4}P_{12}$.Comment: 19 pages, 6 figure

Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe4P12 (x = 0.001) skutterudite

We report electron spin resonance (ESR) measurements in the Gd3+ doped semiconducting filled skutterudite compound Ce1-xGdxFe4P12 (x = 0.001). As the temperature T varies from T = 150 K to T = 165 K, the Gd3+ ESR fine and hyperfine structures coalesce into a broad inhomogeneous single resonance. At T = 200 K the line narrows and as T increases further, the resonance becomes homogeneous with a thermal broadening of 1.1(2) Oe/K. These results suggest that the origin of these features may be associated to a subtle interdependence of thermally activated mechanisms that combine: i) an increase with T of the density of activated conduction-carriers across the T-dependent semiconducting pseudogap; ii) the Gd3+ Korringa relaxation process due to an exchange interaction, J_{fd}S.s, between the Gd3+ localized magnetic moments and the thermally activated conduction-carriers and; iii) a relatively weak confining potential of the rare-earth ions inside the oversized (Fe2P3)4 cage, which allows the rare-earths to become rattler Einstein oscillators above T = 148 K. We argue that the rattling of the Gd3+ ions, via a motional narrowing mechanism, also contributes to the coalescence of the ESR fine and hyperfine structure.Comment: 7 pages, 9 figures, accepted for publication in Phys Rev

Analytical study of an exclusive genetic switch

The nonequilibrium stationary state of an exclusive genetic switch is considered. The model comprises two competing species and a single binding site which, when bound to by a protein of one species, causes the other species to be repressed. The model may be thought of as a minimal model of the power struggle between two competing parties. Exact solutions are given for the limits of vanishing binding/unbinding rates and infinite binding/unbinding rates. A mean field theory is introduced which is exact in the limit of vanishing binding/unbinding rates. The mean field theory and numerical simulations reveal that generically bistability occurs and the system is in a symmetry broken state. An exact perturbative solution which in principle allows the nonequilibrium stationary state to be computed is also developed and computed to first and second order.Comment: 28 pages, 6 figure

A strongly-coupled model for flexible rotors

International audienceA fluid-structure model describing the equilibrium state of a flexible blade rotor with its own wake is derived for various external axial flow conditions. The model is based on three building blocks. The two-dimensional lifting-line theory is first used to compute the local aerodynamic loads and the blade circulation profile. The blade deformation is then obtained by solving the nonlinear equations for bending and twisting angles deduced from a one-dimensional beam model. Finally, the wake is obtained using a Joukowski model. In this wake model, the wake of each blade is modeled by two small-core-size counter-rotating vortices emitted from the rotor axis and blade tip. The velocity field induced by these vortices is computed using the Biot-Savart law. We show that, in the rotor frame, we can obtain a stationary vortex structure for almost any vertical flight regimes. This wake solution can then be used to compute the induced velocity in the rotor plane and apply the two-dimensional lifting-line theory again. By iterating a few times this loop, we converge toward a nonlinear solution of the problem for which the aerodynamics loads, blade deformation and wake structure are compatible. As illustration, this newly-developed model is applied to two rotors. We analyze the effects of the external wind conditions, geometry and material properties of the blades on the blade deformation and wake characteristics. We show that we can describe slow descending regimes for which the classical momentum theory does not apply

Influencia de la concentración de sacarosa en el medio, sobre la respuesta de material de vid "in vitro"

7 páginas, 8 figuras y 16 referencias.-- Trabajo presentado en el VI Simposium Nacional - II Ibérico sobre nutrición mineral de las plantas, Sevilla, del 12 al 15 de Noviembre de 1996.-- Entidades colaboradoras Junta de Andalucía, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, Sociedad Española de Fisiología Vegetal, El Monte, Caja de Huelva y Sevilla y Gat Fertilíquido. Editores científicos: Rafael Sarmiento Solís, Eduardo O. Leidi Montes y Antonio Troncoso de Arce.-- (Instituto de Recursos Naturales y Agrobiología de Sevilla).[EN]: The effects of two sucrose amounts, 20 and 30 gl(elevado a -1), added to the nutrient medium on the in vitro development of grapevine rootstocks 4 lB, 110 Richter, 196-17, 161-49 de Couderc and Rupestris de Lot, of Superior cultivar and of CH-I ,and CH-2 clones from Chile was studied. Medium with the lowest amount of sucrose favoured the aerial part growth of varieties ) 61-49, Rupestris de Lot, Superior and 196-17. This major growth of aerial part of explant (organs with clhorophyll), did not produce it in radical system. Development of this system was independent of sugar concentration in substrat and more in relation with grape variety Substrat with 20 gl(elevado a -1) of sucrose also shown a light major inclination to vitrification of in vitro plant. material[ES]: Se estudia el efecto de dos concentraciones (20 y 30 gl(elevado a -1)) de sacarosa en el medio de cultivo, sobre el desarrollo in vitro de los portainjertos de vid 41B, 110 de ichter,) 96-17, 161-49 de Couderc y Rupestris de Lot, del cultivar Superior y de los clones CH-) y CH-2 procedentes de Chile. El medio con la concentración mas baja de sacarosa favoreció, en general el crecimiento de la parte aérea del material de vid in vitro, en especial de las variedades 161-49, Rupestris de Lot, Superior y 196-17. Este mayor crecimiento de la parte aérea del explanto (órganos con clorofila), no se produjo en el sistema radical, cuyo desarrollo fue independiente de la concentración de azúcar en el medio y mas relacionable con la variedad de vid. El medio con 20 gl(elevado a -1) de sacarosa también mostró una ligera mayor predisposición a.la vitrificacón del material vegetal in vitro.Peer reviewe