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Sample records for energized small polyatomic

  1. Spectroscopic and dynamical studies of highly energized small polyatomic molecules

    Energy Technology Data Exchange (ETDEWEB)

    Field, R.W.; Silbey, R.J. [Massachusetts Institute of Technology, Cambridge (United States)

    1993-12-01

    The authors have initiated a program to perform spectroscopic and dynamic studies of small molecules. Large amplitude motions in excited acetylene were discussed along with plans to record the dispersed fluorescence (DF) and the stimulated emission pumping (SEP) spectra. SEP spectra were reported for the formyl radical. A Fourier transform spectrometer was discussed with respect to its ability to probe the structure of radicals. This instrument is capable of performing studies using various techniques such as magnetic rotation spectroscopy and sub-Doppler sideband-OODR Zeman (SOODRZ) spectroscopy.

  2. America Saves! Energizing Main Street's Small Businesses

    Energy Technology Data Exchange (ETDEWEB)

    Lindberg, James [National Trust for Historic Preservation, Washington, DC (United States)

    2016-09-30

    The America Saves! Energizing Main Street Small Businesses project engaged the 1,200-member National Main Street Center (NMSC) network of downtown organizations and other local, regional, and national partners to test a methodology for sharing customized energy efficiency information with owners of commercial buildings smaller than 50,000 square feet. Led by the National Trust for Historic Preservation’s Preservation Green Lab, the project marshalled local staff and volunteers to gather voluntarily-disclosed energy use information from participating businesses. This information was analyzed using a remote auditing tool (validated by the National Renewable Energy Lab) to assess energy savings opportunities and design retrofit strategies targeting seven building types (food service and sales, attached mixed-use, strip mall, retail, office, lodging, and schools). The original project design contemplated extensive leveraging of the Green Button protocol for sharing annualized utility data at a district scale. Due the lack of adoption of Green Button, the project partners developed customized approaches to data collection in each of twelve pilot communities. The project team encountered considerable challenges in gathering standardized annual utility data from local partners. After overcoming these issues, the data was uploaded to a data storehouse. Over 450 properties were benchmarked and the remote auditing tool was tested using full building profiles and utility records for more than 100 commercial properties in three of the pilot communities. The audit tool demonstrated potential for quickly capturing, analyzing, and communicating energy efficiency opportunities in small commercial buildings. However, the project team found that the unique physical characteristics and use patterns (partial vacancy, periodic intensive uses) of small commercial buildings required more trouble-shooting and data correction than was anticipated. In addition, the project revealed that

  3. Multiple scattering of ions in polyatomic materials

    International Nuclear Information System (INIS)

    Eastham, D.A.

    1980-01-01

    The equations which determine small angle multiple scattering in the thin polyatomic layers are evaluated numerically for certain cases. A simple approximate method for calculating the scattering in terms of an average target charge which is a function of the target thickness is given and compared with the exact numerical value. The results agree to better than 5% over a wide range of target composition and thickness. (orig.)

  4. Electrondriven processes in polyatomic molecules

    Energy Technology Data Exchange (ETDEWEB)

    McKoy, Vincent [California Inst. of Technology (CalTech), Pasadena, CA (United States)

    2017-03-20

    This project developed and applied scalable computational methods to obtain information about low-energy electron collisions with larger polyatomic molecules. Such collisions are important in modeling radiation damage to living systems, in spark ignition and combustion, and in plasma processing of materials. The focus of the project was to develop efficient methods that could be used to obtain both fundamental scientific insights and data of practical value to applications.

  5. Energized Learning

    Science.gov (United States)

    college-level courses. The site includes lessons and activities that develop specific skills and knowledge that planning for an energy efficient future involves knowledge of science, mathematics, economics and skepticism about their predictive power. At the core of the Energized Leaning site is a interactive web-based

  6. Ecología energética y nutricional en aves herbívoras pequeñas Energetics and nutritional ecology of small herbivorous birds

    Directory of Open Access Journals (Sweden)

    M. VICTORIA LOPEZ-CALLEJA

    2000-09-01

    Full Text Available La herbivoría en aves es una estrategia poco común. Solo el 3% de las aves actuales consumen plantas como fuente de energía. Tanto la composición química de las plantas como las restricciones asociadas al vuelo y digestión en aves pueden explicar el reducido número de pequeños endotermos, como las aves, que son herbívoros. Nuestro objetivo es explicar como las aves herbívoras satisfacen sus requerimientos nutricionales y energéticos cuando consumen dietas extremadamente pobres. Para lo cual nos centramos en Phytotoma rara (Phytotomidae, posiblemente el ave herbívora más pequeña. Phytotoma rara presenta numerosas características, como el rápido tiempo de transito, un efectivo rompimiento de la pared celular, y la alta y constante actividad de las enzimas digestivas, que le permiten disponer de nutrientes y energía celulares, sin los costos energéticos asociados al desarrollo de estructuras anatómicas de fermentación bacteriana o lentos tiempos de transito. Estos son posiblemente adaptaciones cruciales en la evolución de la herbivoría en aves pequeñas.Herbivory is a rare strategy in birds. Only 3% of extant birds exploit plant material as an energy source. Both plant chemical composition and bird constraints associated to flight and digestion may explain why herbivory is so scarce in small endotherms such as birds. Here we tackle the question of how herbivorous birds meet energy/nutrient requirements when feeding on extremely poor diets. We focus on Phytotoma rara (Phytotomidae, possibly the smallest herbivorous bird. From our mini-review we conclude that several features such as the fast passage rates, an effective physical breakdown of cell walls, and constant and high activities of digestive enzymes make available the highly nutritious cell contents to the small herbivore, without the energy costs of anatomical structures for bacterial fermentation or slow passage rates. These are possible crucial adaptations in the

  7. Method for preparation and readout of polyatomic molecules in single quantum states

    Science.gov (United States)

    Patterson, David

    2018-03-01

    Polyatomic molecular ions contain many desirable attributes of a useful quantum system, including rich internal degrees of freedom and highly controllable coupling to the environment. To date, the vast majority of state-specific experimental work on molecular ions has concentrated on diatomic species. The ability to prepare and read out polyatomic molecules in single quantum states would enable diverse experimental avenues not available with diatomics, including new applications in precision measurement, sensitive chemical and chiral analysis at the single-molecule level, and precise studies of Hz-level molecular tunneling dynamics. While cooling the motional state of a polyatomic ion via sympathetic cooling with a laser-cooled atomic ion is straightforward, coupling this motional state to the internal state of the molecule has proven challenging. Here we propose a method for readout and projective measurement of the internal state of a trapped polyatomic ion. The method exploits the rich manifold of technically accessible rotational states in the molecule to realize robust state preparation and readout with far less stringent engineering than quantum logic methods recently demonstrated on diatomic molecules. The method can be applied to any reasonably small (≲10 atoms) polyatomic ion with an anisotropic polarizability.

  8. Energy distribution in dissociations of polyatomic molecules

    International Nuclear Information System (INIS)

    Koernig, S.A.

    1989-01-01

    In this thesis studies are reported of fragmentation processes in polyatomic molecules. In order to find out which dessocaciation reactions take place, how they are brought about by the internal energy of the reactant, and to investigate the structure of the dissociating 'transition state', the fragment mass and the corresponding kinetic energy release (KER) are determined by differential translational spectroscopy using a position and time sensitive two-particle coincidence detector. The results are interpreted using the statistical theory of unimolecular dissociation. It turns out that the standard assumptions of the theory, especially in calculating KER-distributions, are not realistic in all molecules considered. Dissociation is induced by the neutralization with alkali metal vapour. In ch. 2 the experimental method and the analysis of the data (dissociation pathways, branching ratios and ε-d-distributions) are introduced and exemplified by measurements of cyclohexane, which represents the upper limit in precursor and fragment mass accessible in the apparatus. In ch. 3 a study is reported of the molecules methylchloride (CH 3 Cl) and the acetylradical (CH 3 CO). In spite of their similar geometric structures, completely different dissociation mechanisms have been found. Methylchloride dissociates via a repulsive state; acetyl radicals show energy scrambling. The energy distribution from dissociating acetyl exemplifies dynamical effects in the dissociation. In ch. 4 an investigation of a number of prototype hydrocarbons is presented. The dissociation pathways of several small linear alkanes indicate that neutralization takes place to unknown repulsive potentials, of which the position and steepness are determined from the kinetic energy release. (author). 118 refs.; 40 figs.; 5 tabs

  9. Multiple photon infrared processes in polyatomic molecules

    International Nuclear Information System (INIS)

    Harrison, R.G.; Butcher, S.R.

    1980-01-01

    This paper reviews current understanding of the process of multiple photon excitation and dissociation of polyatomic molecules, whereby in the presence of an intense infrared laser field a molecule may absorb upwards of 30 photons. The application of this process to new photochemistry and in particular laser isotope separation is also discussed. (author)

  10. Reaction dynamics in polyatomic molecular systems

    Energy Technology Data Exchange (ETDEWEB)

    Miller, W.H. [Lawrence Berkeley Laboratory, CA (United States)

    1993-12-01

    The goal of this program is the development of theoretical methods and models for describing the dynamics of chemical reactions, with specific interest for application to polyatomic molecular systems of special interest and relevance. There is interest in developing the most rigorous possible theoretical approaches and also in more approximate treatments that are more readily applicable to complex systems.

  11. SMALL-SCALE MAGNETIC ISLANDS IN THE SOLAR WIND AND THEIR ROLE IN PARTICLE ACCELERATION. II. PARTICLE ENERGIZATION INSIDE MAGNETICALLY CONFINED CAVITIES

    International Nuclear Information System (INIS)

    Khabarova, Olga V.; Zank, Gary P.; Li, Gang; Le Roux, Jakobus A.; Webb, Gary M.; Malandraki, Olga E.

    2016-01-01

    We explore the role of heliospheric magnetic field configurations and conditions that favor the generation and confinement of small-scale magnetic islands associated with atypical energetic particle events (AEPEs) in the solar wind. Some AEPEs do not align with standard particle acceleration mechanisms, such as flare-related or simple diffusive shock acceleration processes related to interplanetary coronal mass ejections (ICMEs) and corotating interaction regions (CIRs). As we have shown recently, energetic particle flux enhancements may well originate locally and can be explained by particle acceleration in regions filled with small-scale magnetic islands with a typical width of ∼0.01 au or less, which is often observed near the heliospheric current sheet (HCS). The particle energization is a consequence of magnetic reconnection-related processes in islands experiencing either merging or contraction, observed, for example, in HCS ripples. Here we provide more observations that support the idea and the theory of particle energization produced by small-scale-flux-rope dynamics (Zank et al. and Le Roux et al.). If the particles are pre-accelerated to keV energies via classical mechanisms, they may be additionally accelerated up to 1–1.5 MeV inside magnetically confined cavities of various origins. The magnetic cavities, formed by current sheets, may occur at the interface of different streams such as CIRs and ICMEs or ICMEs and coronal hole flows. They may also form during the HCS interaction with interplanetary shocks (ISs) or CIRs/ICMEs. Particle acceleration inside magnetic cavities may explain puzzling AEPEs occurring far beyond ISs, within ICMEs, before approaching CIRs as well as between CIRs.

  12. Implementation of polyatomic MCTDHF capability

    Science.gov (United States)

    Haxton, Daniel; Jones, Jeremiah; Rescigno, Thomas; McCurdy, C. William; Ibrahim, Khaled; Williams, Sam; Vecharynski, Eugene; Rouet, Francois-Henry; Li, Xiaoye; Yang, Chao

    2015-05-01

    The implementation of the Multiconfiguration Time-Dependent Hartree-Fock method for poly- atomic molecules using a cartesian product grid of sinc basis functions will be discussed. The focus will be on two key components of the method: first, the use of a resolution-of-the-identity approximation; sec- ond, the use of established techniques for triple Toeplitz matrix algebra using fast Fourier transform over distributed memory architectures (MPI 3D FFT). The scaling of two-electron matrix element transformations is converted from O(N4) to O(N log N) by including these components. Here N = n3, with n the number of points on a side. We test the prelim- inary implementation by calculating absorption spectra of small hydro- carbons, using approximately 16-512 points on a side. This work is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under the Early Career program, and by the offices of BES and Advanced Scientific Computing Research, under the SciDAC program.

  13. Free and binary rotation of polyatomic molecules

    International Nuclear Information System (INIS)

    Konyukhov, V K

    2003-01-01

    A modification of the quantum-mechanical theory of rotation of polyatomic molecules (binary rotation) is proposed, which is based on the algebra and representations of the SO(4) group and allows the introduction of the concept of parity, as in atomic spectroscopy. It is shown that, if an asymmetric top molecule performing binary rotation finds itself in a spatially inhomogeneous electric field, its rotational levels acquire the additional energy due to the quadrupole moment. The existence of the rotational states of polyatomic molecules that cannot transfer to the free rotation state is predicted. In particular, the spin isomers of a water molecule, which corresponds to such states, can have different absolute values of the adsorption energy due to the quadrupole interaction of the molecule with a surface. The difference in the adsorption energies allows one to explain qualitatively the behaviour of the ortho- and para-molecules of water upon their adsorption on the surface of solids in accordance with experimental data. (laser applications and other topics in quantum electronics)

  14. Constructing Potential Energy Surfaces for Polyatomic Systems: Recent Progress and New Problems

    Directory of Open Access Journals (Sweden)

    J. Espinosa-Garcia

    2012-01-01

    Full Text Available Different methods of constructing potential energy surfaces in polyatomic systems are reviewed, with the emphasis put on fitting, interpolation, and analytical (defined by functional forms approaches, based on quantum chemistry electronic structure calculations. The different approaches are reviewed first, followed by a comparison using the benchmark H + CH4 and the H + NH3 gas-phase hydrogen abstraction reactions. Different kinetics and dynamics properties are analyzed for these reactions and compared with the available experimental data, which permits one to estimate the advantages and disadvantages of each method. Finally, we analyze different problems with increasing difficulty in the potential energy construction: spin-orbit coupling, molecular size, and more complicated reactions with several maxima and minima, which test the soundness and general applicability of each method. We conclude that, although the field of small systems, typically atom-diatom, is mature, there still remains much work to be done in the field of polyatomic systems.

  15. Polyatomic ions from a high current ion implanter driven by a liquid metal ion source

    Science.gov (United States)

    Pilz, W.; Laufer, P.; Tajmar, M.; Böttger, R.; Bischoff, L.

    2017-12-01

    High current liquid metal ion sources are well known and found their first application as field emission electric propulsion thrusters in space technology. The aim of this work is the adaption of such kind of sources in broad ion beam technology. Surface patterning based on self-organized nano-structures on, e.g., semiconductor materials formed by heavy mono- or polyatomic ion irradiation from liquid metal (alloy) ion sources (LMAISs) is a very promising technique. LMAISs are nearly the only type of sources delivering polyatomic ions from about half of the periodic table elements. To overcome the lack of only very small treated areas by applying a focused ion beam equipped with such sources, the technology taken from space propulsion systems was transferred into a large single-end ion implanter. The main component is an ion beam injector based on high current LMAISs combined with suited ion optics allocating ion currents in the μA range in a nearly parallel beam of a few mm in diameter. Different types of LMAIS (needle, porous emitter, and capillary) are presented and characterized. The ion beam injector design is specified as well as the implementation of this module into a 200 kV high current ion implanter operating at the HZDR Ion Beam Center. Finally, the obtained results of large area surface modification of Ge using polyatomic Bi2+ ions at room temperature from a GaBi capillary LMAIS will be presented and discussed.

  16. Half-space problem of unsteady evaporation and condensation of polyatomic gas

    Science.gov (United States)

    Inaba, Masashi; Yano, Takeru

    2016-11-01

    On the basis of polyatomic version of the ellipsoidal-statistical Bhatnager-Gross-Krook (ES-BGK) model, we consider time-periodic gas flows in a semi-infinite expanse of an initially equilibrium polyatomic gas (methanol) bounded by its planar condensed phase. The kinetic boundary condition at the vapor-liquid interface is assumed to be the complete condensation condition with periodically time-varying macroscopic variables (temperature, saturated vapor density and velocity of the interface), and the boundary condition at infinity is the local equilibrium distribution function. The time scale of variation of macroscopic variables is assumed to be much larger than the mean free time of gas molecules, and the variations of those from a reference state are assumed to be sufficiently small. We numerically investigate thus formulated time-dependent half-space problem for the polyatomic version of linearized ES-BGK model equation with the finite difference method for the case of the Strouhal number Sh=0.01 and 0.1. It is shown that the amplitude of the mass flux at the interface is the maximum, and the phase difference in time between the mass flux and v∞ - vℓ (v∞: vapor velocity at infinity, vℓ: velocity of the vapor-liquid interface) is the minimum absolute value, when the phase difference in time between the liquid surface temperature (the saturated vapor density) and the velocity of interface is close to zero.

  17. Attosecond-recollision-controlled selective fragmentation of polyatomic molecules.

    Science.gov (United States)

    Xie, Xinhua; Doblhoff-Dier, Katharina; Roither, Stefan; Schöffler, Markus S; Kartashov, Daniil; Xu, Huailiang; Rathje, Tim; Paulus, Gerhard G; Baltuška, Andrius; Gräfe, Stefanie; Kitzler, Markus

    2012-12-14

    Control over various fragmentation reactions of a series of polyatomic molecules (acetylene, ethylene, 1,3-butadiene) by the optical waveform of intense few-cycle laser pulses is demonstrated experimentally. We show both experimentally and theoretically that the responsible mechanism is inelastic ionization from inner-valence molecular orbitals by recolliding electron wave packets, whose recollision energy in few-cycle ionizing laser pulses strongly depends on the optical waveform. Our work demonstrates an efficient and selective way of predetermining fragmentation and isomerization reactions in polyatomic molecules on subfemtosecond time scales.

  18. selective excitation of vibrational modes of polyatomic molecule

    Indian Academy of Sciences (India)

    Abstract. Mode-selective dynamics of triatomic molecule in the electronic ground state under continuous wave laser pulse is investigated for the discrete vibrational bound states. A non-perturbative approach has been used to analyse the vibrational couplings and dynamics of the molecule. Keywords. Polyatomic molecule ...

  19. Vibrational relaxation induced population inversions in laser pumped polyatomic molecules

    International Nuclear Information System (INIS)

    Shamah, I.; Flynn, G.; Columbia Univ., New York

    1981-01-01

    Conditions for population inversion in laser pumped polyatomic molecules are described. For systems which exhibit metastable vibrational population distributions, large, long lived inversions are possible even when the vibrational modes are strongly coupled by rapid collisional vibration-vibration (V-V) energy transfer. Overtone states of a hot mode are found to invert with respect to fundamental levels of a cold mode even at V-V steady state. Inversion persists for a V-T/R relaxation time. A gain of 4 m -1 for the 2ν 3 → ν 2 transition in CH 3 F (lambda approx. 15.9 μ) was found assuming a spontaneous emission lifetime of 10 s for this transition. General equations are derived which can be used to determine the magnitude of population inversion in any laser pumped, vibrationally metastable, polyatomic molecule. A discussion of factors controlling the population maxima of different vibrational states in optically pumped, V-V equilibrated metastable polyatomics is also given. (orig./WL)

  20. Polyatomic ions in inductively coupled plasma-mass spectrometry

    International Nuclear Information System (INIS)

    Ferguson, Jill Wisnewski; Dudley, Timothy J.; Sears, Kyle C.; McIntyre, Sally M.; Gordon, Mark S.; Houk, R.S.

    2009-01-01

    Several polyatomic ions in inductively coupled plasma-mass spectrometry are studied experimentally and by computational methods. Novel calculations based on spin-restricted open shell second order perturbation theory (ZAPT2) and coupled cluster (CCSD(T)) theory are performed to determine the energies, structures and partition functions of the ions. These values are combined with experimental data to evaluate a dissociation constant and gas kinetic temperature (T gas ) value. In our opinion, the resulting T gas value can sometimes be interpreted to deduce the location where the polyatomic ion of interest is generated. The dissociation of N 2 H + to N 2 + leads to a calculated T gas of 4550 to 4900 K, depending on the computational data used. The COH + to CO + system yields a similar temperature, which is not surprising considering the similar energies and structures of COH + and N 2 H + . The dissociation of H 2 CO + to HCO + leads to a much lower T gas ( 2 COH + to HCOH + generates a T gas value between those from the other H x CO + ions studied here. All of these measured T gas values correspond to formation of extra polyatomic ion in the interface or extraction region. The computations reveal the existence of isomers such as HCO + and COH + , and H 2 CO + and HCOH + , which have virtually the same m/z values and need to be considered in the interpretation of results.

  1. Collisions of polyatomic ions with surfaces: incident energy partitioning and chemical reactions

    International Nuclear Information System (INIS)

    Zabka, J.; Roithova, J.; Dolejsek, Z.; Herman, Z.

    2002-01-01

    transformed into the product ion translation energy varied with the incident angle between 18 - 45 % of the incident energy for the incident angle 40 o - 80 o with respect to the surface normal, respectively. The rest of the incident energy was absorbed by the surface. The only exception was the perfuloro-hydrocarbon SAM, where about 17 % of the incident energy was transformed into internal energy of the polyatomic projectile. The hydrocarbon SAM behaved very similarly as the stainless steel or carbon surfaces, covered by hydrocarbons. The peak of the angular distribution of the product ions showed a simple correlation between the parallel and perpendicular components of the velocities of the incident and product ions. Collisions of small polyatomic ions CD 5 + , CD 4 + , CD 3 + (from methane) with carbon HOPG (highly oriented pyrolytic graphite) surface were investigated at room and elevated (600 o C) temperature of the surface. At the room temperature and collision energies of 7 - 52 eV, the main processes was inelastic dissociation of the projectile ion and chemical reactions with surface hydrocarbons. The main chemical product with CD 4 + projectiles was CD 4 H - (H-atom transfer) and its dissociation products, and formation of C 2 X 3 + and C 3 X 3 + (X 0 H 2 D) in reactions with terminal groups of the surface hydrocarbons. Complementary experiments with CH 4 - and 13 CH 4 + enable determination of the fraction of the product from projectile ion-surface chemical reactions and surface sputtering. Translation energy and angular distributions of the product ions together with the isotopic scrambling data provided new information of the details of the ion-surface chemical processes. (author)

  2. Energía financiera

    OpenAIRE

    Altuve G., José G.

    2016-01-01

    La energía financiera surge como consecuencia de la unión de los conceptos energía y financiera. La primera, como la acción a seguir en un momento del tiempo, y la segunda vinculada al manejo de variables tales como: Estructura financiera y su costo de capital y, las decisiones de inversión consideradas bajo riesgo. Si se armonizan estos dos aspectos estamos en presencia de la fusión de la energía y la administración financiera en dos de sus variables más importantes. Financial power arise...

  3. Effect of the dynamic pressure on the shock wave structure in a rarefied polyatomic gas

    Energy Technology Data Exchange (ETDEWEB)

    Taniguchi, Shigeru, E-mail: taniguchi@stat.nitech.ac.jp; Sugiyama, Masaru, E-mail: sugiyama@nitech.ac.jp [Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan); Arima, Takashi, E-mail: tks@stat.nitech.ac.jp [Center for Social Contribution and Collaboration, Nagoya Institute of Technology, Nagoya 466-8555 (Japan); Ruggeri, Tommaso, E-mail: tommaso.ruggeri@unibo.it [Department of Mathematics and Research Center of Applied Mathematics (CIRAM), University of Bologna, Bologna (Italy)

    2014-01-15

    We study the shock wave structure in a rarefied polyatomic gas based on a simplified model of extended thermodynamics in which the dissipation is due only to the dynamic pressure. In this case the differential system is very simple because it is a variant of Euler system with a new scalar equation for the dynamic pressure [T. Arima, S. Taniguchi, T. Ruggeri, and M. Sugiyama, Phys. Lett. A 376, 2799–2803 (2012)]. It is shown that this theory is able to describe the three types of the shock wave structure observed in experiments: the nearly symmetric shock wave structure (Type A, small Mach number), the asymmetric structure (Type B, moderate Mach number), and the structure composed of thin and thick layers (Type C, large Mach number)

  4. Damage functions generation for polyatomic materials irradiated in test reactors

    International Nuclear Information System (INIS)

    Alberman, A.; Lesueur, D.

    1987-06-01

    Neutron exposure parameters in polyatomic materials is of great importance for fusion technology programs. The COMPOSI code computes the number of displaced atoms of sub-lattice ''j'' induced by one atom of sub-lattice ''i'' either by direct collision or through intermediate knocked atom. The code uses Lindhard equations; it is solved by iterative process. The atomic displacements cross-sections, as a function of neutron energy are derived by folding previous results with ''i'' type PKA. Moreover the COMPOSI code may include recoils from charged particles e.g.: Alpha + Triton from Li 6 capture in Li Al 0 2 . These responses in various spectra are discussed [fr

  5. Vacuum ultraviolet photoionization and photodissociation of polyatomic molecules and radicals

    Energy Technology Data Exchange (ETDEWEB)

    Ng, C.Y. [Iowa State Univ., Ames (United States)

    1993-12-01

    In the past decade, tremendous progress has been made in understanding the photodissociation (PD) dynamics of triatomic molecules. However, the PD study of radicals, especially polyatomic radicals, has remained essentially an unexplored research area. Detailed state-to-state PD cross sections for radicals in the UV and VUV provide challenges not only for dynamical calculations, but also for ab initio quantum chemical studies. The authors have developed a laser based pump-probe apparatus for the measurement of absolute PD cross sections for CH{sub 3}S and HS is summarized.

  6. Polyatomic Trilobite Rydberg Molecules in a Dense Random Gas.

    Science.gov (United States)

    Luukko, Perttu J J; Rost, Jan-Michael

    2017-11-17

    Trilobites are exotic giant dimers with enormous dipole moments. They consist of a Rydberg atom and a distant ground-state atom bound together by short-range electron-neutral attraction. We show that highly polar, polyatomic trilobite states unexpectedly persist and thrive in a dense ultracold gas of randomly positioned atoms. This is caused by perturbation-induced quantum scarring and the localization of electron density on randomly occurring atom clusters. At certain densities these states also mix with an s state, overcoming selection rules that hinder the photoassociation of ordinary trilobites.

  7. Discrete Velocity Models for Polyatomic Molecules Without Nonphysical Collision Invariants

    Science.gov (United States)

    Bernhoff, Niclas

    2018-05-01

    An important aspect of constructing discrete velocity models (DVMs) for the Boltzmann equation is to obtain the right number of collision invariants. Unlike for the Boltzmann equation, for DVMs there can appear extra collision invariants, so called spurious collision invariants, in plus to the physical ones. A DVM with only physical collision invariants, and hence, without spurious ones, is called normal. The construction of such normal DVMs has been studied a lot in the literature for single species, but also for binary mixtures and recently extensively for multicomponent mixtures. In this paper, we address ways of constructing normal DVMs for polyatomic molecules (here represented by that each molecule has an internal energy, to account for non-translational energies, which can change during collisions), under the assumption that the set of allowed internal energies are finite. We present general algorithms for constructing such models, but we also give concrete examples of such constructions. This approach can also be combined with similar constructions of multicomponent mixtures to obtain multicomponent mixtures with polyatomic molecules, which is also briefly outlined. Then also, chemical reactions can be added.

  8. Accurate and approximate thermal rate constants for polyatomic chemical reactions

    International Nuclear Information System (INIS)

    Nyman, Gunnar

    2007-01-01

    In favourable cases it is possible to calculate thermal rate constants for polyatomic reactions to high accuracy from first principles. Here, we discuss the use of flux correlation functions combined with the multi-configurational time-dependent Hartree (MCTDH) approach to efficiently calculate cumulative reaction probabilities and thermal rate constants for polyatomic chemical reactions. Three isotopic variants of the H 2 + CH 3 → CH 4 + H reaction are used to illustrate the theory. There is good agreement with experimental results although the experimental rates generally are larger than the calculated ones, which are believed to be at least as accurate as the experimental rates. Approximations allowing evaluation of the thermal rate constant above 400 K are treated. It is also noted that for the treated reactions, transition state theory (TST) gives accurate rate constants above 500 K. TST theory also gives accurate results for kinetic isotope effects in cases where the mass of the transfered atom is unchanged. Due to neglect of tunnelling, TST however fails below 400 K if the mass of the transferred atom changes between the isotopic reactions

  9. Hydrodynamic limits of kinetic equations for polyatomic and reactive gases

    Directory of Open Access Journals (Sweden)

    Bisi M.

    2017-03-01

    Full Text Available Starting from a kinetic BGK-model for a rarefied polyatomic gas, based on a molecular structure of discrete internal energy levels, an asymptotic Chapman-Enskog procedure is developed in the asymptotic continuum limit in order to derive consistent fluid-dynamic equations for macroscopic fields at Navier-Stokes level. In this way, the model allows to treat the gas as a mixture of mono-atomic species. Explicit expressions are given not only for dynamical pressure, but also for shear stress, diffusion velocities, and heat flux. The analysis is shown to deal properly also with a mixture of reactive gases, endowed for simplicity with translational degrees of freedom only, in which frame analogous results can be achieved.

  10. Kinetic theory of two-temperature polyatomic plasmas

    Science.gov (United States)

    Orlac'h, Jean-Maxime; Giovangigli, Vincent; Novikova, Tatiana; Roca i Cabarrocas, Pere

    2018-03-01

    We investigate the kinetic theory of two-temperature plasmas for reactive polyatomic gas mixtures. The Knudsen number is taken proportional to the square root of the mass ratio between electrons and heavy-species, and thermal non-equilibrium between electrons and heavy species is allowed. The kinetic non-equilibrium framework also requires a weak coupling between electrons and internal energy modes of heavy species. The zeroth-order and first-order fluid equations are derived by using a generalized Chapman-Enskog method. Expressions for transport fluxes are obtained in terms of macroscopic variable gradients and the corresponding transport coefficients are expressed as bracket products of species perturbed distribution functions. The theory derived in this paper provides a consistent fluid model for non-thermal multicomponent plasmas.

  11. Femtosecond response of polyatomic molecules to ultra-intense hard X-rays.

    Science.gov (United States)

    Rudenko, A; Inhester, L; Hanasaki, K; Li, X; Robatjazi, S J; Erk, B; Boll, R; Toyota, K; Hao, Y; Vendrell, O; Bomme, C; Savelyev, E; Rudek, B; Foucar, L; Southworth, S H; Lehmann, C S; Kraessig, B; Marchenko, T; Simon, M; Ueda, K; Ferguson, K R; Bucher, M; Gorkhover, T; Carron, S; Alonso-Mori, R; Koglin, J E; Correa, J; Williams, G J; Boutet, S; Young, L; Bostedt, C; Son, S-K; Santra, R; Rolles, D

    2017-06-01

    X-ray free-electron lasers enable the investigation of the structure and dynamics of diverse systems, including atoms, molecules, nanocrystals and single bioparticles, under extreme conditions. Many imaging applications that target biological systems and complex materials use hard X-ray pulses with extremely high peak intensities (exceeding 10 20 watts per square centimetre). However, fundamental investigations have focused mainly on the individual response of atoms and small molecules using soft X-rays with much lower intensities. Studies with intense X-ray pulses have shown that irradiated atoms reach a very high degree of ionization, owing to multiphoton absorption, which in a heteronuclear molecular system occurs predominantly locally on a heavy atom (provided that the absorption cross-section of the heavy atom is considerably larger than those of its neighbours) and is followed by efficient redistribution of the induced charge. In serial femtosecond crystallography of biological objects-an application of X-ray free-electron lasers that greatly enhances our ability to determine protein structure-the ionization of heavy atoms increases the local radiation damage that is seen in the diffraction patterns of these objects and has been suggested as a way of phasing the diffraction data. On the basis of experiments using either soft or less-intense hard X-rays, it is thought that the induced charge and associated radiation damage of atoms in polyatomic molecules can be inferred from the charge that is induced in an isolated atom under otherwise comparable irradiation conditions. Here we show that the femtosecond response of small polyatomic molecules that contain one heavy atom to ultra-intense (with intensities approaching 10 20 watts per square centimetre), hard (with photon energies of 8.3 kiloelectronvolts) X-ray pulses is qualitatively different: our experimental and modelling results establish that, under these conditions, the ionization of a molecule is

  12. Low energy elastic electron scattering from polyatomic targets

    International Nuclear Information System (INIS)

    Khakoo, M A

    2008-01-01

    New differential cross-section measurements for elastic electron scattering from ethylene (C 2 H 4 ), three primary alcohols, methanol (CH 3 OH), ethanol (C 2 H 5 OH) and propanol (C 3 H 7 OH) are reported. The measurements are obtained using the relative flow method with a thin aperture as the collimating target gas source. The relative flow method is applied without the molecular diameters restriction imposed by the relative flow pressure condition on helium (the calibrating gas) and the unknown gases (the primary alcohols). The experimental data were taken at incident electron energies of 1eV, 2eV, 5eV, 10eV, 15eV, 20eV, 30eV, 50eV and 100eV, but only a brief survey of these results will be made here. The experimental results are compared to theoretical differential cross-sections are obtained by using the variational multi-channel Schwinger method. Initial comparisons between theory and experiment show that present theory is well-able to model low electron scattering from these polyatomic targets.

  13. Desorption of organic molecules with fast incident atomic and polyatomic ions

    International Nuclear Information System (INIS)

    Hunt, J.E.; Salehpour, M.; Fishel, D.L.

    1989-01-01

    In 1974, Macfarlane and coworkers introduced a new mass spectrometric technique based on desorption-ionization of sample molecules from solid targets by the impact of fast heavy ions (fission fragments) from 252 Cf. The process of ion-induced desorption of molecular ions from surfaces is not yet fully understood, although a large amount of experimental data related to the mechanism has been published. This paper concerns the use of fast incident polyatomic ions to induce desorption of secondary molecular ions of valine and chlorophyll from surfaces. Polyatomic ions are unique in that they are a collection of temporally and spatially correlated atoms. The main finding in this study is that incident polyatomic ions produce drastic enhancements in the secondary ion yields over atomic ions. Also, two types of nonlinear effects in desorption have been observed and will be discussed

  14. Controlling the nanoscale morphology of organic films deposited by polyatomic ions

    CERN Document Server

    Hanley, L; Fuoco, E R; Ahu-Akin, F; Wijesundara, M B J; Li, Maozhen; Tikhonov, A; Schlossman, M

    2003-01-01

    Hyperthermal polyatomic ion beams can be used to fabricate thin film nanostructures with controlled morphology. Several experiments are described in which mass-selected and non-mass-selected polyatomic ion beams are used to create nanometer thick films with controlled surface and buried interface morphologies. Fluorocarbon and thiophenic films are grown on silicon wafers and/or polystyrene from 5 to 200 eV C sub 3 F sub 5 sup + or C sub 4 H sub 4 S sup + ions, respectively. X-ray photoelectron spectroscopy, atomic force microscopy, X-ray reflectivity, and scanning electron microscopy are utilized to analyze the morphology and chemistry of these films. Polyatomic ions are found to control film morphology on the nanoscale through variation of the incident ion energy, ion structure and/or substrate.

  15. Capability of LEP-type surfaces to describe noncollinear reactions 2 - Polyatomic systems

    CERN Document Server

    Espinosa-Garcia, Joaquin

    2001-01-01

    In this second article of the series, the popular LEP-type surface for collinear reaction paths and a "bent" surface, which involves a saddle point geometry with a nonlinear central angle, were used to examine the capacity of LEP-type surfaces to describe the kinetics and dynamics of noncollinear reaction paths in polyatomic systems. Analyzing the geometries, vibrational frequencies, curvature along the reaction path (to estimate the tunneling effect and the reaction coordinate-bound modes coupling), and the variational transition- state theory thermal rate constants for the NH//3 + O(**3P) reaction, we found that the "collinear" LEP-type and the "bent" surfaces for this polyatomic system show similar behavior, thus allowing a considerable saving in time and computational effort. This agreement is especially encouraging for this polyatomic system because in the Cs symmetry the reaction proceeds via two electronic states of symmetries **3A prime and **3A double prime , which had to be independently calibrated....

  16. Mechanism and models for collisional energy transfer in highly excited large polyatomic molecules

    International Nuclear Information System (INIS)

    Gilbert, R. G.

    1995-01-01

    Collisional energy transfer in highly excited molecules (say, 200-500 kJ mol -1 above the zero-point energy of reactant, or of product, for a recombination reaction) is reviewed. An understanding of this energy transfer is important in predicting and interpreting the pressure dependence of gas-phase rate coefficients for unimolecular and recombination reactions. For many years it was thought that this pressure dependence could be calculated from a single energy-transfer quantity, such as the average energy transferred per collision. However, the discovery of 'super collisions' (a small but significant fraction of collisions which transfer abnormally large amounts of energy) means that this simplistic approach needs some revision. The 'ordinary' (non-super) component of the distribution function for collisional energy transfer can be quantified either by empirical models (e.g., an exponential-down functional form) or by models with a physical basis, such as biased random walk (applicable to monatomic or diatomic collision partners) or ergodic (for polyatomic collision partners) treatments. The latter two models enable approximate expressions for the average energy transfer to be estimated from readily available molecular parameters. Rotational energy transfer, important for finding the pressure dependence for recombination reactions, can for these purposes usually be taken as transferring sufficient energy so that the explicit functional form is not required to predict the pressure dependence. The mechanism of 'ordinary' energy transfer seems to be dominated by low-frequency modes of the substrate, whereby there is sufficient time during a vibrational period for significant energy flow between the collision partners. Super collisions may involve sudden energy flow as an outer atom of the substrate is squashed between the substrate and the bath gas, and then is moved away from the interaction by large-amplitude motion such as a ring vibration or a rotation; improved

  17. One-dimensional treatment of polyatomic crystals by the Laplace transform method

    International Nuclear Information System (INIS)

    Rosato, A.; Santana, P.H.A.

    1976-01-01

    The one dimensional periodic potential problem is solved using the Laplace transform method and a condensed expression for the relation E x k and effective mass for one electron in a polyatomic structure is determined. Applications related to the effect of the asymmetry of the potential upon the one dimensional band structure are discussed [pt

  18. Energía mareomotriz: potencial energético y medio ambiente

    Directory of Open Access Journals (Sweden)

    Julián Rodrigo Quintero González

    2015-07-01

    Full Text Available La energía mareomotriz ha tenido un gran desarrollo en relación a su potencial energético y el estudio de sus impactos ambientales. Este trabajo presenta una perspectiva acerca de estos dos aspectos que han sido ampliamente evaluados en diferentes países. Se concluye que el potencial energético de la energía mareomotriz es significativo, en relación con las capacidades instaladas de las plantas de energía actualmente en operación, con el incremento de la producción energética anual y con el número de nuevos proyectos en el marco global. Se indica también que existen impactos ambientales moderados con su implementación.

  19. Selective excitation of a vibrational level within the electronic ground state of a polyatomic molecule with ultra pulses

    CSIR Research Space (South Africa)

    de Clercq, L

    2010-09-01

    Full Text Available Coherent control of the upper vibrational level populations in the electronic ground state of a polyatomic molecule was simulated. Results indicate that selective excitation of a specific upper state level is possible...

  20. Molecular dynamics study of kinetic boundary condition at an interface between a polyatomic vapor and its condensed phase

    OpenAIRE

    Ishiyama, Tatsuya; Yano, Takeru; Fujikawa, Shigeo

    2004-01-01

    The kinetic boundary condition for the Boltzmann equation at an interface between a polyatomic vapor and its liquid phase is investigated by the numerical method of molecular dynamics, with particular emphasis on the functional form of the evaporation part of the boundary condition, including the evaporation coefficient. The present study is an extension of a previous one for argon [Ishiyama, Yano, and Fujikawa, Phys. Fluids 16, 2899 (2004)] to water and methanol, typical examples of polyatom...

  1. The role of the dynamic pressure in stationary heat conduction of a rarefied polyatomic gas

    Energy Technology Data Exchange (ETDEWEB)

    Arima, Takashi, E-mail: arima@kanagawa-u.ac.jp [Department of Mechanical Engineering, Faculty of Engineering, Kanagawa University, Yokohama 221-8686 (Japan); Barbera, Elvira, E-mail: ebarbera@unime.it [Department of Mathematics and Computer Science, University of Messina, V.le F. D' Alcontres 31, 98166 Messina (Italy); Brini, Francesca, E-mail: francesca.brini@unibo.it [Department of Mathematics, University of Bologna, via Saragozza 8, 40123 Bologna (Italy); Sugiyama, Masaru, E-mail: sugiyama@nitech.ac.jp [Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan)

    2014-07-18

    The effect of the dynamic pressure (non-equilibrium pressure) on stationary heat conduction in a rarefied polyatomic gas at rest is elucidated by the theory of extended thermodynamics. It is shown that this effect is observable in a non-polytropic gas. Numerical studies are presented for a para-hydrogen gas as a typical example. - Highlights: • Heat transfer problem in polyatomic rarefied gases is studied in different domains. • Non-zero dynamic pressure is predicted in non-polytropic gases. • The effect of dynamic pressure can be observed indirectly in an experiment. • The case of para-hydrogen is analyzed as an example. • Navier–Stokes, Fourier, and Extended Thermodynamics predictions are compared.

  2. NATO Advanced Research Workshop on Dynamics of Polyatomic Van der Waals Complexes

    CERN Document Server

    Janda, Kenneth

    1991-01-01

    This publication is the Proceedings of the NATO Advanced Research Workshop (ARW) on the Dynamics of Polyatomic Van der Waals Molecules held at the Chateau de Bonas, Castera-Verduzan, France, from August 21 through August 26, 1989. Van der Waals complexes provide important model problems for understanding energy transfer and dissipation. These processes can be described in great detail for Van der Waals complexes, and the insight gained from such studies can be applied to more complicated chemical problems that are not amenable to detailed study. The workshop concentrated on the current questions and future prospects for extend­ ing our highly detailed knowledge of triatomic Van der Waals molecule dynamics to polyatomic molecules and clusters (one molecule surrounded by several, or up to sev­ eral tens of, atoms). Both experimental and theoretical studies were discussed, with particular emphasis on the dynamical behavior of dissociation as observed in the dis­ tributions of quantum states of the dissociatio...

  3. A brief introduction to molecular orbital theory of simple polyatomic molecules for undergraduate chemistry students

    Directory of Open Access Journals (Sweden)

    Ione M. Baibich

    2012-01-01

    Full Text Available A simple, four-step method for better introducing undergraduate students to the fundamentals of molecular orbital (MO theory of the polyatomic molecules H2O, NH3, BH3 and SiH4 using group theory is reported. These molecules serve to illustrate the concept of ligand group orbitals (LGOs and subsequent construction of MO energy diagrams on the basis of molecular symmetry requirements.

  4. Vibration-rotation band intensities in the IR spectra of polyatomic molecules

    International Nuclear Information System (INIS)

    El'kin, M.D.; Kosterina, E.K.; Berezin

    1995-01-01

    Using the curvilinear vibrational coordinates for a nuclear subsystem, expressions for the effective dipole-moment operators are derived in order to analyze the vibrational-rotational transitions in the IR spectra of polyatomic rigid molecules. The explicit expressions obtained for the intensities of hot bands allow one to estimate the influence of the vibration-rotation interaction within the framework of the adopted molecular-vibration model. The suggested method is shown to be suitable for Raman spectra analysis. 12 refs

  5. Energized Oxygen : Speiser Current Sheet Bifurcation

    Science.gov (United States)

    George, D. E.; Jahn, J. M.

    2017-12-01

    A single population of energized Oxygen (O+) is shown to produce a cross-tail bifurcated current sheet in 2.5D PIC simulations of the magnetotail without the influence of magnetic reconnection. Treatment of oxygen in simulations of space plasmas, specifically a magnetotail current sheet, has been limited to thermal energies despite observations of and mechanisms which explain energized ions. We performed simulations of a homogeneous oxygen background, that has been energized in a physically appropriate manner, to study the behavior of current sheets and magnetic reconnection, specifically their bifurcation. This work uses a 2.5D explicit Particle-In-a-Cell (PIC) code to investigate the dynamics of energized heavy ions as they stream Dawn-to-Dusk in the magnetotail current sheet. We present a simulation study dealing with the response of a current sheet system to energized oxygen ions. We establish a, well known and studied, 2-species GEM Challenge Harris current sheet as a starting point. This system is known to eventually evolve and produce magnetic reconnection upon thinning of the current sheet. We added a uniform distribution of thermal O+ to the background. This 3-species system is also known to eventually evolve and produce magnetic reconnection. We add one additional variable to the system by providing an initial duskward velocity to energize the O+. We also traced individual particle motion within the PIC simulation. Three main results are shown. First, energized dawn- dusk streaming ions are clearly seen to exhibit sustained Speiser motion. Second, a single population of heavy ions clearly produces a stable bifurcated current sheet. Third, magnetic reconnection is not required to produce the bifurcated current sheet. Finally a bifurcated current sheet is compatible with the Harris current sheet model. This work is the first step in a series of investigations aimed at studying the effects of energized heavy ions on magnetic reconnection. This work differs

  6. Molecular extended thermodynamics of rarefied polyatomic gases and wave velocities for increasing number of moments

    Energy Technology Data Exchange (ETDEWEB)

    Arima, Takashi, E-mail: tks@stat.nitech.ac.jp [Center for Social Contribution and Collaboration, Nagoya Institute of Technology (Japan); Mentrelli, Andrea, E-mail: andrea.mentrelli@unibo.it [Department of Mathematics and Research Center of Applied Mathematics (CIRAM), University of Bologna (Italy); Ruggeri, Tommaso, E-mail: tommaso.ruggeri@unibo.it [Department of Mathematics and Research Center of Applied Mathematics (CIRAM), University of Bologna (Italy)

    2014-06-15

    Molecular extended thermodynamics of rarefied polyatomic gases is characterized by two hierarchies of equations for moments of a suitable distribution function in which the internal degrees of freedom of a molecule is taken into account. On the basis of physical relevance the truncation orders of the two hierarchies are proven to be not independent on each other, and the closure procedures based on the maximum entropy principle (MEP) and on the entropy principle (EP) are proven to be equivalent. The characteristic velocities of the emerging hyperbolic system of differential equations are compared to those obtained for monatomic gases and the lower bound estimate for the maximum equilibrium characteristic velocity established for monatomic gases (characterized by only one hierarchy for moments with truncation order of moments N) by Boillat and Ruggeri (1997) (λ{sub (N)}{sup E,max})/(c{sub 0}) ⩾√(6/5 (N−1/2 )),(c{sub 0}=√(5/3 k/m T)) is proven to hold also for rarefied polyatomic gases independently from the degrees of freedom of a molecule. -- Highlights: •Molecular extended thermodynamics of rarefied polyatomic gases is studied. •The relation between two hierarchies of equations for moments is derived. •The equivalence of maximum entropy principle and entropy principle is proven. •The characteristic velocities are compared to those of monatomic gases. •The lower bound of the maximum characteristic velocity is estimated.

  7. Molecular extended thermodynamics of rarefied polyatomic gases and wave velocities for increasing number of moments

    International Nuclear Information System (INIS)

    Arima, Takashi; Mentrelli, Andrea; Ruggeri, Tommaso

    2014-01-01

    Molecular extended thermodynamics of rarefied polyatomic gases is characterized by two hierarchies of equations for moments of a suitable distribution function in which the internal degrees of freedom of a molecule is taken into account. On the basis of physical relevance the truncation orders of the two hierarchies are proven to be not independent on each other, and the closure procedures based on the maximum entropy principle (MEP) and on the entropy principle (EP) are proven to be equivalent. The characteristic velocities of the emerging hyperbolic system of differential equations are compared to those obtained for monatomic gases and the lower bound estimate for the maximum equilibrium characteristic velocity established for monatomic gases (characterized by only one hierarchy for moments with truncation order of moments N) by Boillat and Ruggeri (1997) (λ (N) E,max )/(c 0 ) ⩾√(6/5 (N−1/2 )),(c 0 =√(5/3 k/m T)) is proven to hold also for rarefied polyatomic gases independently from the degrees of freedom of a molecule. -- Highlights: •Molecular extended thermodynamics of rarefied polyatomic gases is studied. •The relation between two hierarchies of equations for moments is derived. •The equivalence of maximum entropy principle and entropy principle is proven. •The characteristic velocities are compared to those of monatomic gases. •The lower bound of the maximum characteristic velocity is estimated

  8. Cosecha de energía

    OpenAIRE

    García Ojero, Jesús

    2016-01-01

    En este trabajo se analizarán los distintos métodos conocidos de extraer energía de fuentes tanto naturales como las producidas por el ser humano, entre las que se pueden distinguir las vibraciones mecánicas, gradientes de temperatura o las ondas electromagnéticas emitidas por aparatos electrónicos. Primero realizaremos una revisión bibliográfica de distintos métodos de obtención de energía a partir de vibraciones mecánicas, utilizando materiales piezoeléctricos y actuadores electromagnéticos...

  9. Role conflict: cause of burnout or energizer?

    Science.gov (United States)

    Jones, M L

    1993-03-01

    A year-long study of public child welfare administrators examined the effects of role conflict on their attitudes and performance. Popular belief and some of the literature have suggested that burnout is inevitable for those confronted with role conflict. Other literature has proposed that it may instead be energizing to individuals and lead to greater personal and organizational effectiveness. This qualitative study found that individuals in the study had developed specific, effective skills for responding to role conflict. Although there was a public presentation of self that indicated they were under stress and in "impossible" situations, there was in fact an energizing effect resulting from the ongoing challenge of dealing with conflict.

  10. Final Technical Report, reEnergize Program

    Energy Technology Data Exchange (ETDEWEB)

    Wamstad-Evans, Kristi [City of Omaha; Williams, Eric [City of Omaha; Kubicek, Jason [City of Omaha

    2013-12-27

    The reEnergize Program helped to build a market for residential and commercial energy evaluations and upgrades. The program provided incentives to encourage participants to save energy, save money, and make their homes and businesses more safe, healthy, and comfortable. As part of the Better Buildings Neighborhood Program (BBNP), the successful investment of this $10 million grant toward market development was the first grant funding collaboration between the cities of Omaha and Lincoln. Through more than three years of work, thousands of participants, contractors, and community members worked together to make the reEnergize Program a demonstration of how to “Build Energy Smart Communities.”

  11. Extended Thermodynamics of Rarefied Polyatomic Gases: 15-Field Theory Incorporating Relaxation Processes of Molecular Rotation and Vibration

    Directory of Open Access Journals (Sweden)

    Takashi Arima

    2018-04-01

    Full Text Available After summarizing the present status of Rational Extended Thermodynamics (RET of gases, which is an endeavor to generalize the Navier–Stokes and Fourier (NSF theory of viscous heat-conducting fluids, we develop the molecular RET theory of rarefied polyatomic gases with 15 independent fields. The theory is justified, at mesoscopic level, by a generalized Boltzmann equation in which the distribution function depends on two internal variables that take into account the energy exchange among the different molecular modes of a gas, that is, translational, rotational, and vibrational modes. By adopting the generalized Bhatnagar, Gross and Krook (BGK-type collision term, we derive explicitly the closed system of field equations with the use of the Maximum Entropy Principle (MEP. The NSF theory is derived from the RET theory as a limiting case of small relaxation times via the Maxwellian iteration. The relaxation times introduced in the theory are shown to be related to the shear and bulk viscosities and heat conductivity.

  12. Development of high electrical resistance persistent current switch for high speed energization system

    International Nuclear Information System (INIS)

    Jizo, Y.; Furuta, Y.; Nakashima, H.

    1986-01-01

    Japanese National Railways is now developing a superconducting magnetically-levitated train system. A persistent current switch is incorporated in the super-conducting magnet used in the magnetically-levitated train. In recent years, the switch has been required to have higher electrical resistance during its off-state in order to realize the high speed energization/de-energization system of the superconducting magnets. The system aims to decrease evaporation volume of liquid helium during the energization/de-energization of the magnet, by means of energizing the superconducting magnet with high current increasing/decreasing rate. Consequently, it would be possible to decrease the dependence of the on-board magnet system upon the ground cooling system. Through the development of a stable superconductive wire material and a coil structure for the persistent current switch using many small model switches which were produced in order to improve their current carrying capacities, the authors have succeeded in manufacturing the high electrical resistance persistent current switch whose electrical resistance was 5 ohms. The switch, of cylindrical shape, has a diameter of about 100mm, a length of about 100mm. These 5 ohm PCSs are now functioning in stable conditions being incorporated in the superconducting magnets of No.2 vehicle of MLU001 at the JNR's Miyazaki test track. Further, the authors are now developing the PCS of still higher resistance values, such as 50 ohms, through studies for stabilization in structural aspects of the winding and obtaining results therefrom

  13. Herbal Energizers: Speed By Any Other Name.

    Science.gov (United States)

    Jenkins, Andrew P.

    This guide focuses on over-the-counter (OTC) stimulants sold to high school aged athletes and dieters as "herbal energizers," food supplements, and fatigue reducers. While advertising often makes them appear healthful and harmless, all of these stimulants belong in the class "sympathomimetic amines," so called because they…

  14. Temas de Física para Ingeniería: Trabajo y energía

    OpenAIRE

    Beléndez, Augusto; Pastor Antón, Carlos; Bernabeu, Guillermo

    1988-01-01

    Apuntes de Mecánica: "Trabajo y energía". Trabajo y potencia. Energía cinética, teorema de la energía cinética. Fuerzas conservativas, energía potencial. Energía potencial gravitatoria. Principio de conservación de la energía mecánica. Choques.

  15. Rotation driven translational diffusion of polyatomic ions in water: A novel mechanism for breakdown of Stokes-Einstein relation

    Science.gov (United States)

    Banerjee, Puja; Yashonath, Subramanian; Bagchi, Biman

    2017-04-01

    While most of the existing theoretical and simulation studies have focused on simple, spherical, halide and alkali ions, many chemically, biologically, and industrially relevant electrolytes involve complex non-spherical polyatomic ions like nitrate, chlorate, and sulfate to name only a few. Interestingly, some polyatomic ions in spite of being larger in size show anomalously high diffusivity and therefore cause a breakdown of the venerable Stokes-Einstein (S-E) relation between the size and diffusivity. Here we report a detailed analysis of the dynamics of anions in aqueous potassium nitrate (KNO3) and aqueous potassium acetate (CH3COOK) solutions. The two ions, nitrate (-NO3) and acetate (CH3-CO2 ), with their similar size show a large difference in diffusivity values. We present evidence that the translational motion of these polyatomic ions is coupled to the rotational motion of the ion. We show that unlike the acetate ion, nitrate ion with a symmetric charge distribution among all periphery oxygen atoms shows a faster rotational motion with large amplitude rotational jumps which enhances its translational motion due to translational-rotational coupling. By creating a family of modified-charge model systems, we have analysed the rotational motion of asymmetric polyatomic ions and the contribution of it to the translational motion. These model systems help clarifying and establishing the relative contribution of rotational motion in enhancing the diffusivity of the nitrate ion over the value predicted by the S-E relation and also over the other polyatomic ions having asymmetric charge distribution like the acetate ion. In the latter case, reduced rotational motion results in lower diffusivity values than those with symmetric charge distribution. We propose translational-rotational coupling as a general mechanism of the breakdown of the S-E relation in the case of polyatomic ions.

  16. Using polyatomic primary ions to probe an amino acid and a nucleic base in water ice

    Energy Technology Data Exchange (ETDEWEB)

    Conlan, X.A. [Surface Analysis Research Centre, School of Chemical Engineering and Analytical Science, University of Manchester, P.O. Box 88, Manchester M60 1QD (United Kingdom)]. E-mail: x.conlan@postgrad.manchester.ac.uk; Biddulph, G.X. [Surface Analysis Research Centre, School of Chemical Engineering and Analytical Science, University of Manchester, P.O. Box 88, Manchester M60 1QD (United Kingdom)]. E-mail: G.Biddulph@postgrad.manchester.ac.uk; Lockyer, N.P. [Surface Analysis Research Centre, School of Chemical Engineering and Analytical Science, University of Manchester, P.O. Box 88, Manchester M60 1QD (United Kingdom); Vickerman, J.C. [Surface Analysis Research Centre, School of Chemical Engineering and Analytical Science, University of Manchester, P.O. Box 88, Manchester M60 1QD (United Kingdom)]. E-mail: John.Vickerman@manchester.ac.uk

    2006-07-30

    In this study on pure water ice, we show that protonated water species [H{sub 2}O] {sub n}H{sup +} are more prevalent than (H{sub 2}O) {sub n} {sup +} ions after bombardment by Au{sup +} monoatomic and Au{sub 3} {sup +} and C{sub 60} {sup +} polyatomic projectiles. This data also reveals significant differences in water cluster yields under bombardment by these three projectiles. The amino acid alanine and the nucleic base adenine in solution have been studied and have been shown to have an effect on the water cluster ion yields observed using an Au{sub 3} {sup +} ion beam.

  17. Electron collision data for polyatomic molecules in plasma processing and environmental processes

    International Nuclear Information System (INIS)

    Tanaka, H.; Kitajima, M.; Cho, H.

    2002-01-01

    The experimental studies for electron-polyatomic molecule collision are reviewed in connection with the plasma processing and environmental issues. Recent developments in electron scattering experiments on the differential cross section measurements for various processes such as elastic scattering, vibrational, and electronic excitations are summarized from high to low energy regions (1-100 eV). The need for cross-section data for a broad variety of molecular species is also discussed because there is an urgent need to develop an international program to provide the scientific and technological communities with authoritative cross sections for electron-molecule interactions

  18. Calculations on isotope separation by laser induced photodissociation of polyatomic molecules. Final report

    International Nuclear Information System (INIS)

    Lamb, W.E. Jr.

    1978-11-01

    This report describes research on the theory of isotope separation produced by the illumination of polyatomic molecules by intense infrared laser radiation. Newton's equations of motion were integrated for the atoms of the SF 6 molecule including the laser field interaction. The first year's work has been largely dedicated to obtaining a suitable interatomic potential valid for arbitrary configurations of the seven particles. This potential gives the correct symmetry of the molecule, the equilibrium configuration, the frequencies of the six distinct normal modes of oscillation and the correct (or assumed) value of the total potential energy of the molecule. Other conditions can easily be imposed in order to obtain a more refined potential energy function, for example, by making allowance for anharmonicity data. A suitable expression was also obtained for the interaction energy between a laser field and the polyatomic molecule. The electromagnetic field is treated classically, and it would be easily possible to treat the cases of time dependent pulses, frequency modulation and noise

  19. An exact variational method to calculate rovibrational spectra of polyatomic molecules with large amplitude motion

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Hua-Gen, E-mail: hgy@bnl.gov [Division of Chemistry, Department of Energy and Photon Sciences, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

    2016-08-28

    We report a new full-dimensional variational algorithm to calculate rovibrational spectra of polyatomic molecules using an exact quantum mechanical Hamiltonian. The rovibrational Hamiltonian of system is derived in a set of orthogonal polyspherical coordinates in the body-fixed frame. It is expressed in an explicitly Hermitian form. The Hamiltonian has a universal formulation regardless of the choice of orthogonal polyspherical coordinates and the number of atoms in molecule, which is suitable for developing a general program to study the spectra of many polyatomic systems. An efficient coupled-state approach is also proposed to solve the eigenvalue problem of the Hamiltonian using a multi-layer Lanczos iterative diagonalization approach via a set of direct product basis set in three coordinate groups: radial coordinates, angular variables, and overall rotational angles. A simple set of symmetric top rotational functions is used for the overall rotation whereas a potential-optimized discrete variable representation method is employed in radial coordinates. A set of contracted vibrationally diabatic basis functions is adopted in internal angular variables. Those diabatic functions are first computed using a neural network iterative diagonalization method based on a reduced-dimension Hamiltonian but only once. The final rovibrational energies are computed using a modified Lanczos method for a given total angular momentum J, which is usually fast. Two numerical applications to CH{sub 4} and H{sub 2}CO are given, together with a comparison with previous results.

  20. The second-order description of rotational non-equilibrium effects in polyatomic gases

    Science.gov (United States)

    Myong, Rho Shin

    2017-11-01

    The conventional description of gases is based on the physical laws of conservation (mass, momentum, and energy) in conjunction with the first-order constitutive laws, the two-century old so-called Navier-Stokes-Fourier (NSF) equation based on a critical assumption made by Stokes in 1845 that the bulk viscosity vanishes. While the Stokes' assumption is certainly legitimate in the case of dilute monatomic gases, ever increasing evidences, however, now indicate that such is not the case, in particular, in the case of polyatomic gases-like nitrogen and carbon dioxide-far-from local thermal equilibrium. It should be noted that, from room temperature acoustic attenuation data, the bulk viscosity for carbon dioxide is three orders of magnitude larger than its shear viscosity. In this study, this fundamental issue in compressible gas dynamics is revisited and the second-order constitutive laws are derived by starting from the Boltzmann-Curtiss kinetic equation. Then the topology of the second-order nonlinear coupled constitutive relations in phase space is investigated. Finally, the shock-vortex interaction problem where the strong interaction of two important thermal (translational and rotational) non-equilibrium phenomena occurs is considered in order to highlight the rotational non-equilibrium effects in polyatomic gases. This work was supported by the National Research Foundation of South Korea (NRF 2017-R1A2B2-007634).

  1. Energy distribution in selected fragment vibrations in dissociation processes in polyatomic molecules

    International Nuclear Information System (INIS)

    Band, Y.B.; Freed, K.F.

    1977-01-01

    The full quantum theory of dissociation processes in polyatomic molecules is converted to a form enabling the isolation of a selected fragment vibration. This form enables the easy evaluation of the probability distribution for energy partitioning between this vibration and all other degrees of freedom that results from the sudden Franck--Condon rearrangement process. The resultant Franck--Condon factors involve the square of the one-dimensional overlap integral between effective oscillator wavefunctions and the wavefunctions for the selected fragment vibration, a form that resembles the simple golden rule model for polyatomic dissociation and reaction processes. The full quantum theory can, therefore, be viewed as providing both a rigorous justification for certain generic aspects of the simple golden rule model as well as providing a number of important generalizations thereof. Some of these involve dealing with initial bound state vibrational excitation, explicit molecule, fragment and energy dependence of the effective oscillator, and the incorporation of all isotopic dependence. In certain limiting situations the full quantum theory yields simple, readily usable analytic expressions for the frequency and equilibrium position of the effective oscillator. Specific applications are presented for the direct photodissociation of HCN, DCN, and CO 2 where comparisons between the full theory and the simple golden rule are presented. We also discuss the generalizations of the previous theory to enable the incorporation of effects of distortion in the normal modes as a function of the reaction coordinate on the repulsive potential energy surface

  2. Computer system for structure recognition of polyatomic molecules by i. r. , n. m. r. , u. v. and m. s. methods

    Energy Technology Data Exchange (ETDEWEB)

    Gribov, L A; Elyashberg, M E; Serov, V V [USSR Academy of Sciences, Moscow (USSR). V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry

    1977-12-15

    A system of algorithms and programs for the recognition of the structures of polyatomic molecules by means of i.r., n.m.r., u.v. and mass spectra is described. Examples of structures identified are cited. The results are promising and suggest that the system could be used for the identification of complex organic compounds.

  3. Modelado Energético de Convertidores Primarios para el Aprovechamiento de las Energías Renovables Marinas

    Directory of Open Access Journals (Sweden)

    Amable López

    2014-04-01

    this paper is to present the most common harnessing methods for different types of renewable energy from the sea, and to analyze energy models of the devices used for their exploitation. These models are required for the design of the device as well as for the studying of their dynamic behavior. The knowledge of these models is also necessary for dynamic simulation and for the design of control algorithms in order to achieve energy and economic optimizations. In this paper, some of the different types of ocean energy are presented and the interest in the development of specific devices for the exploitation of sea currents and waves is justified. A small classification based on the depth of water in the area where these devices are to be installed is presented too. For wave energy converters, which are generally resonant type, a general methodology is presented. The different fields of acting forces and methods for obtaining the time and frequency responses are analyzed. For devices for the exploitation of energy from sea currents, it is presented a simplified methodology of dynamic modeling that can be used in analysis of the particular device. It is taken into account the hydrodynamic profiles used in these devices, the data flow profile with depth and wave model together with the gearbox-generator set dynamics. The proposed methodology is applied to a specific case study, corresponding to a horizontal axis rotor from a device for harnessing of tidal energy. The obtained results allow to analyze the effects of wave and flow conditions of non uniform current over the most important energy variables. Palabras clave: energías renovables marinas, modelado y simulación, teoría del elemento de pala, modelado del recurso, absorbedor puntual, Keywords: marine renewable energies, modelling and simulation, blade element theory, resource modelling, point absorber

  4. Interference effects during the reradiation of ultrashort electromagnetic pulses by polyatomic systems

    Energy Technology Data Exchange (ETDEWEB)

    Makarov, D. N.; Matveev, V. I., E-mail: mezon98@mail.ru [Lomonosov Northern (Arctic) Federal University (Russian Federation)

    2013-11-15

    A theory of the reradiation of ultrashort electromagnetic pulses by arbitrary polyatomic systems of isolated complex atoms has been developed. The technique used allows the spatial inhomogeneity of the field of an ultrashort pulse and photon momenta in reradiation processes to be accurately taken into account. The angular distributions of the reradiation spectra have been obtained for an arbitrary number of atoms in the system. The processes of interference between the photon emission amplitudes are shown to give rise to characteristic “diffraction” maxima. We consider one-dimensional, two-dimensional, and three-dimensional rectangular lattices as examples as well as planar and cylindrical structures as models of planar nanosystems and nanotubes.

  5. A BGK model for reactive mixtures of polyatomic gases with continuous internal energy

    Science.gov (United States)

    Bisi, M.; Monaco, R.; Soares, A. J.

    2018-03-01

    In this paper we derive a BGK relaxation model for a mixture of polyatomic gases with a continuous structure of internal energies. The emphasis of the paper is on the case of a quaternary mixture undergoing a reversible chemical reaction of bimolecular type. For such a mixture we prove an H -theorem and characterize the equilibrium solutions with the related mass action law of chemical kinetics. Further, a Chapman-Enskog asymptotic analysis is performed in view of computing the first-order non-equilibrium corrections to the distribution functions and investigating the transport properties of the reactive mixture. The chemical reaction rate is explicitly derived at the first order and the balance equations for the constituent number densities are derived at the Euler level.

  6. Studies of electron collisions with polyatomic molecules using distributed-memory parallel computers

    International Nuclear Information System (INIS)

    Winstead, C.; Hipes, P.G.; Lima, M.A.P.; McKoy, V.

    1991-01-01

    Elastic electron scattering cross sections from 5--30 eV are reported for the molecules C 2 H 4 , C 2 H 6 , C 3 H 8 , Si 2 H 6 , and GeH 4 , obtained using an implementation of the Schwinger multichannel method for distributed-memory parallel computer architectures. These results, obtained within the static-exchange approximation, are in generally good agreement with the available experimental data. These calculations demonstrate the potential of highly parallel computation in the study of collisions between low-energy electrons and polyatomic gases. The computational methodology discussed is also directly applicable to the calculation of elastic cross sections at higher levels of approximation (target polarization) and of electronic excitation cross sections

  7. Rational extended thermodynamics of a rarefied polyatomic gas with molecular relaxation processes

    Science.gov (United States)

    Arima, Takashi; Ruggeri, Tommaso; Sugiyama, Masaru

    2017-10-01

    We present a more refined version of rational extended thermodynamics of rarefied polyatomic gases in which molecular rotational and vibrational relaxation processes are treated individually. In this case, we need a triple hierarchy of the moment system and the system of balance equations is closed via the maximum entropy principle. Three different types of the production terms in the system, which are suggested by a generalized BGK-type collision term in the Boltzmann equation, are adopted. In particular, the rational extended thermodynamic theory with seven independent fields (ET7) is analyzed in detail. Finally, the dispersion relation of ultrasonic wave derived from the ET7 theory is confirmed by the experimental data for CO2, Cl2, and Br2 gases.

  8. Laser fluorimetry of mixtures of polyatomic organic compounds using artificial neural networks

    International Nuclear Information System (INIS)

    Dolenko, S A; Gerdova, I V; Dolenko, T A; Fadeev, V V

    2001-01-01

    New possibilities of laser fluorimetry offered by the use of algorithms for solving inverse problems based on artificial neural networks are demonstrated. A two-component mixture of polyatomic organic compounds is analysed by three methods of laser fluorimetry: a direct analysis of the fluorescence band, the kinetic fluorimetry (when durations of the laser pulse and the detector gate pulse are comparable with the fluorescence lifetimes or exceed them), and the saturation fluorimetry. The numerical experiments showed that the use of artificial neural networks in these methods provides a high practical stability of the solution of inverse problems and ensures a high sensitivity and a high accuracy of determining the contribution of components to fluorescence and of measuring molecular photophysical parameters, which can be used for the identification of components. (laser applications and other topics in quantum electronics)

  9. Probing strong-field electron-nuclear dynamics of polyatomic molecules using proton motion

    International Nuclear Information System (INIS)

    Markevitch, Alexei N.; Smith, Stanley M.; Levis, Robert J.; Romanov, Dmitri A.

    2007-01-01

    Proton ejection during Coulomb explosion is studied for several structure-related organic molecules (anthracene, anthraquinone, and octahydroanthracene) subjected to 800 nm, 60 fs laser pulses at intensities from 0.50 to 4.0x10 14 W cm -2 . The proton kinetic energy distributions are found to be markedly structure specific. The distributions are bimodal for anthracene and octahydroanthracene and trimodal for anthraquinone. Maximum (cutoff) energies of the distributions range from 50 eV for anthracene to 83 eV for anthraquinone. The low-energy mode (∼10 eV) is most pronounced in octahydroanthracene. The dependence of the characteristic features of the distributions on the laser intensity provides insights into molecular specificity of such strong-field phenomena as (i) nonadiabatic charge localization and (ii) field-mediated restructuring of polyatomic molecules polarized by a strong laser field

  10. Investigations into the origins of polyatomic ions in inductively coupled plasma-mass spectrometry

    Energy Technology Data Exchange (ETDEWEB)

    McIntyre, Sally M. [Iowa State Univ., Ames, IA (United States)

    2010-01-01

    An inductively coupled plasma-mass spectrometer (ICP-MS) is an elemental analytical instrument capable of determining nearly all elements in the periodic table at limits of detection in the parts per quadrillion and with a linear analytical range over 8-10 orders of magnitude. Three concentric quartz tubes make up the plasma torch. Argon gas is spiraled through the outer tube and generates the plasma powered by a looped load coil operating at 27.1 or 40.6 MHz. The argon flow of the middle channel is used to keep the plasma above the innermost tube through which solid or aqueous sample is carried in a third argon stream. A sample is progressively desolvated, atomized and ionized. The torch is operated at atmospheric pressure. To reach the reduced pressures of mass spectrometers, ions are extracted through a series of two, approximately one millimeter wide, circular apertures set in water cooled metal cones. The space between the cones is evacuated to approximately one torr. The space behind the second cone is pumped down to, or near to, the pressure needed for the mass spectrometer (MS). The first cone, called the sampler, is placed directly in the plasma plume and its position is adjusted to the point where atomic ions are most abundant. The hot plasma gas expands through the sampler orifice and in this expansion is placed the second cone, called the skimmer. After the skimmer traditional MS designs are employed, i.e. quadrupoles, magnetic sectors, time-of-flight. ICP-MS is the leading trace element analysis technique. One of its weaknesses are polyatomic ions. This dissertation has added to the fundamental understanding of some of these polyatomic ions, their origins and behavior. Although mainly continuing the work of others, certain novel approaches have been introduced here. Chapter 2 includes the first reported efforts to include high temperature corrections to the partition functions of the polyatomic ions in ICP-MS. This and other objections to preceeding

  11. 29 CFR 1926.957 - Construction in energized substations.

    Science.gov (United States)

    2010-07-01

    ... Distribution § 1926.957 Construction in energized substations. (a) Work near energized equipment facilities. (1... lines. When it is necessary to deenergize equipment or lines for protection of employees, the... large electrical equipment, transformers, or breakers. (f) Storage. The storage requirements of § 1926...

  12. Bayesian optimization for constructing potential energy surfaces of polyatomic molecules with the smallest number of ab initio calculations

    Science.gov (United States)

    Vargas-Hernandez, Rodrigo A.; v Krems, Roman

    2017-04-01

    We examine the application of kernel methods of machine learning for constructing potential energy surfaces (PES) of polyatomic molecules. In particular, we illustrate the application of Bayesian optimization with Gaussian processes as an efficient method for sampling the configuration space of polyatomic molecules. Bayesian optimization relies on two key components: a prior over an objective function and a mechanism for sampling the configuration space. We use Gaussian processes to model the objective function and various acquisition functions commonly used in computer science to quantify the accuracy of sampling. The PES is obtained through an iterative process of adding ab initio points at the locations maximizing the acquisition function and re-trainig the Gaussian process with new points added. We sample different PESs with one or many acquisition functions and show how the acquisition functions affect the construction of the PESs.

  13. Towards efficient ab initio calculations of electron scattering by polyatomic molecules: II. Efficient evaluation of exchange integrals

    Czech Academy of Sciences Publication Activity Database

    Čársky, Petr

    2010-01-01

    Roč. 43, č. 17 (2010), s. 175204 ISSN 0953-4075 R&D Projects: GA MŠk OC09079; GA MŠk(CZ) OC10046; GA ČR GA202/08/0631 Institutional research plan: CEZ:AV0Z40400503 Keywords : ab initio calculations * electron scattering * polyatomic molecules Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 1.902, year: 2010

  14. La pobreza energética y sus implicaciones

    OpenAIRE

    Mikel González-Eguino

    2014-01-01

    32 p. El sector energético se enfrenta en las próximas décadas a tres grandes transformaciones relacionadas con el cambio climático, la seguridad de suministro y la pobreza energética. Las dos primeras han sido analizadas ampliamente. Sin embargo, la pobreza energética ha pasado más desapercibida a pesar de tener una gran influencia en la vida de millones de personas, especialmente en los países más pobres. Actualmente, 1.300 millones de personas (el 20% de la población mundial) no tienen ...

  15. Theoretical simulations of atomic and polyatomic bombardment of an organic overlayer on a metallic substrate

    CERN Document Server

    Krantzman, K D; Delcorte, A; Garrison, B J

    2003-01-01

    Our previous molecular dynamics simulations on initial test systems have laid the foundation for understanding some of the effects of polyatomic bombardment. In this paper, we describe simulations of the bombardment of a more realistic model system, an overlayer of sec-butyl-terminated polystyrene tetramers on a Ag left brace 1 1 1 right brace substrate. We have used this model system to study the bombardment with Xe and SF sub 5 projectiles at kinetic energies ranging from 0.50 to 5.0 keV. SF sub 5 sputters more molecules than Xe, but a higher percentage of these are damaged rather than ejected intact when the bombarding energy is greater than 0.50 keV. Therefore, at energies comparable to experimental values, the efficiency, measured as the yield-to-damage ratio, is greater with Xe than SF sub 5. Stable and intact molecules are generally produced by upward moving substrate atoms, while fragments are produced by the upward and lateral motion of reflected projectile atoms and fragments from the target molecul...

  16. Direct simulation Monte Carlo modeling of relaxation processes in polyatomic gases

    Science.gov (United States)

    Pfeiffer, M.; Nizenkov, P.; Mirza, A.; Fasoulas, S.

    2016-02-01

    Relaxation processes of polyatomic molecules are modeled and implemented in an in-house Direct Simulation Monte Carlo code in order to enable the simulation of atmospheric entry maneuvers at Mars and Saturn's Titan. The description of rotational and vibrational relaxation processes is derived from basic quantum-mechanics using a rigid rotator and a simple harmonic oscillator, respectively. Strategies regarding the vibrational relaxation process are investigated, where good agreement for the relaxation time according to the Landau-Teller expression is found for both methods, the established prohibiting double relaxation method and the new proposed multi-mode relaxation. Differences and applications areas of these two methods are discussed. Consequently, two numerical methods used for sampling of energy values from multi-dimensional distribution functions are compared. The proposed random-walk Metropolis algorithm enables the efficient treatment of multiple vibrational modes within a time step with reasonable computational effort. The implemented model is verified and validated by means of simple reservoir simulations and the comparison to experimental measurements of a hypersonic, carbon-dioxide flow around a flat-faced cylinder.

  17. Direct simulation Monte Carlo modeling of relaxation processes in polyatomic gases

    International Nuclear Information System (INIS)

    Pfeiffer, M.; Nizenkov, P.; Mirza, A.; Fasoulas, S.

    2016-01-01

    Relaxation processes of polyatomic molecules are modeled and implemented in an in-house Direct Simulation Monte Carlo code in order to enable the simulation of atmospheric entry maneuvers at Mars and Saturn’s Titan. The description of rotational and vibrational relaxation processes is derived from basic quantum-mechanics using a rigid rotator and a simple harmonic oscillator, respectively. Strategies regarding the vibrational relaxation process are investigated, where good agreement for the relaxation time according to the Landau-Teller expression is found for both methods, the established prohibiting double relaxation method and the new proposed multi-mode relaxation. Differences and applications areas of these two methods are discussed. Consequently, two numerical methods used for sampling of energy values from multi-dimensional distribution functions are compared. The proposed random-walk Metropolis algorithm enables the efficient treatment of multiple vibrational modes within a time step with reasonable computational effort. The implemented model is verified and validated by means of simple reservoir simulations and the comparison to experimental measurements of a hypersonic, carbon-dioxide flow around a flat-faced cylinder

  18. Direct simulation Monte Carlo modeling of relaxation processes in polyatomic gases

    Energy Technology Data Exchange (ETDEWEB)

    Pfeiffer, M., E-mail: mpfeiffer@irs.uni-stuttgart.de; Nizenkov, P., E-mail: nizenkov@irs.uni-stuttgart.de; Mirza, A., E-mail: mirza@irs.uni-stuttgart.de; Fasoulas, S., E-mail: fasoulas@irs.uni-stuttgart.de [Institute of Space Systems, University of Stuttgart, Pfaffenwaldring 29, D-70569 Stuttgart (Germany)

    2016-02-15

    Relaxation processes of polyatomic molecules are modeled and implemented in an in-house Direct Simulation Monte Carlo code in order to enable the simulation of atmospheric entry maneuvers at Mars and Saturn’s Titan. The description of rotational and vibrational relaxation processes is derived from basic quantum-mechanics using a rigid rotator and a simple harmonic oscillator, respectively. Strategies regarding the vibrational relaxation process are investigated, where good agreement for the relaxation time according to the Landau-Teller expression is found for both methods, the established prohibiting double relaxation method and the new proposed multi-mode relaxation. Differences and applications areas of these two methods are discussed. Consequently, two numerical methods used for sampling of energy values from multi-dimensional distribution functions are compared. The proposed random-walk Metropolis algorithm enables the efficient treatment of multiple vibrational modes within a time step with reasonable computational effort. The implemented model is verified and validated by means of simple reservoir simulations and the comparison to experimental measurements of a hypersonic, carbon-dioxide flow around a flat-faced cylinder.

  19. Z-dependent perturbation theory and its application to polyatomic molecules

    International Nuclear Information System (INIS)

    Galvan, D.H.

    1986-01-01

    Z-dependent perturbation theory is applied to study the ground states of simple diatomic and triatomic molecules in order to calculate the total third-order energies for these systems. The systems studied are H 2 + , H 2 , H 3 + , HeH +2 , HeH + , and HeH 2 +2 . The total energies are compared with exact energy values, as well as Hartree-Fock values, and the author's results are a considerable improvement over second-order energies for most internuclear distances, and consistently better than Hartree-Fock calculations for all internuclear distances. Compared with variational methods, this method is simpler and more efficient. In order to calculate total energies up to third order, the wave functions necessary will be two-center, one electron or one-center, two-electron wave functions, at most. Hence, the most complicated integrals that have to be performed are three-center, two-electron integrals, and four-center, one-electron integrals, no matter how complex the molecular system. More importantly, the results obtained for the one-electron diatomic molecular ion are directly incorporated into the calculations for polyatomic systems

  20. Variational treatment of electron-polyatomic-molecule scattering calculations using adaptive overset grids

    Science.gov (United States)

    Greenman, Loren; Lucchese, Robert R.; McCurdy, C. William

    2017-11-01

    The complex Kohn variational method for electron-polyatomic-molecule scattering is formulated using an overset-grid representation of the scattering wave function. The overset grid consists of a central grid and multiple dense atom-centered subgrids that allow the simultaneous spherical expansions of the wave function about multiple centers. Scattering boundary conditions are enforced by using a basis formed by the repeated application of the free-particle Green's function and potential Ĝ0+V ̂ on the overset grid in a Born-Arnoldi solution of the working equations. The theory is shown to be equivalent to a specific Padé approximant to the T matrix and has rapid convergence properties, in both the number of numerical basis functions employed and the number of partial waves employed in the spherical expansions. The method is demonstrated in calculations on methane and CF4 in the static-exchange approximation and compared in detail with calculations performed with the numerical Schwinger variational approach based on single-center expansions. An efficient procedure for operating with the free-particle Green's function and exchange operators (to which no approximation is made) is also described.

  1. Communication: General variational approach to nuclear-quadrupole coupling in rovibrational spectra of polyatomic molecules

    Science.gov (United States)

    Yachmenev, Andrey; Küpper, Jochen

    2017-10-01

    A general algorithm for computing the quadrupole-hyperfine effects in the rovibrational spectra of polyatomic molecules is presented for the case of ammonia (NH3). The method extends the general variational approach TROVE [J. Mol. Spectrosc. 245, 126-140 (2007)] by adding the extra term in the Hamiltonian that describes the nuclear quadrupole coupling, with no inherent limitation on the number of quadrupolar nuclei in a molecule. We applied the new approach to compute the nitrogen-nuclear-quadrupole hyperfine structure in the rovibrational spectrum of NH143. These results agree very well with recent experimental spectroscopic data for the pure rotational transitions in the ground vibrational and ν2 states and the rovibrational transitions in the ν1, ν3, 2ν4, and ν1 + ν3 bands. The computed hyperfine-resolved rovibrational spectrum of ammonia will be beneficial for the assignment of experimental rovibrational spectra, further detection of ammonia in interstellar space, and studies of the proton-to-electron mass variation.

  2. Energía minihidráulica : una alternativa energética para electrificación rural

    OpenAIRE

    Agudelo Flórez, Sergio Cipriano; Chamorro Rendón, Luis Javier

    2002-01-01

    Entre las actividades del Grupo de Energía Alternativa (GEA) de la Facultad de Ingeniería de la Universidad de Antioquia, se pretende el desarrollo de prototipos que aprovechen las fuentes no convencionales para la producción de energía eléctrica y así satisfacer las necesidades insatisfechas de las viviendas rurales aisladas de la red energética nacional. En la región del Oriente antioqueño, se encontró un formidable recurso hidráulico de grandes ríos, quebradas y fuentes de agua cercanas a ...

  3. Radiation signatures from a locally energized flaring loop

    International Nuclear Information System (INIS)

    Emslie, A.G.; Vlahos, L.; and Institute for Plasma Research, Stanford University)

    1980-01-01

    We calculate the radiation signatures from a locally energized solar flare loop, at a variety of wavelengths. Our calculations depend strongly on the physical properties of the energy release mechanism which we qualitatively discuss

  4. Energization of helium ions by proton-induced hydromagnetic waves

    International Nuclear Information System (INIS)

    Gendrin, R.; Roux, A.

    1980-01-01

    We consider the diffusion of He + ions under the influence of ion cyclotron waves generated in a plasma consisting of three different ion populations: a thermal isotropic population containing both H + and He + ions and an energetic H + population, with a positive anisotropy A=T/sub perpendicular//T/sub parallel/-1. We compute, in the velocity space upsilon/sub parallel/, upsilon/sub perpendicular/, the diffusion curves that He + ions will follow in the presence of ion cyclotron waves propagating in such a medium. We show that for small concentrations of the He + ions, of the order of 1 to approx.10%, these ions can be energized by such a process up to and above suprathermal energies (E> or approx. =20 eV). On some occasions the He + ions may even reach energies of the order of the Alfven energy of the cold plasma population: E/sub a/approx. =m/sub p/V/sub a/ 2 approx. =5 keV. Characteristic diffusion times, in pitch angle and energy, for both ion species, are evaluated. They are of the order of 2 to 20 min. These theoretical results are discussed in the frame of recent observations by Geos experimenters showing the close association that exists between the occurrence of ion cyclotron ULF waves and the presence of thermal or supra-thermal He + ions in the equatorial region of the magnetosphere

  5. Som Energia: sostenibilitat energètica i cooperativisme

    OpenAIRE

    Duran i Grant, Alexandre; Huijink, Gijsbert; Roselló, Marc

    2013-01-01

    La cooperativa Som Energia és una organització innovadora en el sector energètic a casa nostra. Proposa una forma de fer diferent de la de les empreses tradicionals del sector: ven energia renovable certificada, no té ànim de lucre i busca el bé comú. La proposta treballa per la sostenibilitat energètica.

  6. Energizing Subject Guide Service with Web 2.0

    Directory of Open Access Journals (Sweden)

    Sheau-Hwang Chang

    2014-06-01

    Full Text Available This article will use LibGuides as an example to illustrate how a Web 2.0 platform can energize the subject guide service and give librarians an edge in expanding their roles. Topics to be discussed will include a brief introduction to LibGuides and its capabilities to energize subject guide creation, how it has been used by academic libraries, how it is used in Maxwell Library in expanding librarian's role, and finally its implications on librarianship.

  7. Combined optimization model for sustainable energization strategy

    Science.gov (United States)

    Abtew, Mohammed Seid

    Access to energy is a foundation to establish a positive impact on multiple aspects of human development. Both developed and developing countries have a common concern of achieving a sustainable energy supply to fuel economic growth and improve the quality of life with minimal environmental impacts. The Least Developing Countries (LDCs), however, have different economic, social, and energy systems. Prevalence of power outage, lack of access to electricity, structural dissimilarity between rural and urban regions, and traditional fuel dominance for cooking and the resultant health and environmental hazards are some of the distinguishing characteristics of these nations. Most energy planning models have been designed for developed countries' socio-economic demographics and have missed the opportunity to address special features of the poor countries. An improved mixed-integer programming energy-source optimization model is developed to address limitations associated with using current energy optimization models for LDCs, tackle development of the sustainable energization strategies, and ensure diversification and risk management provisions in the selected energy mix. The Model predicted a shift from traditional fuels reliant and weather vulnerable energy source mix to a least cost and reliable modern clean energy sources portfolio, a climb on the energy ladder, and scored multifaceted economic, social, and environmental benefits. At the same time, it represented a transition strategy that evolves to increasingly cleaner energy technologies with growth as opposed to an expensive solution that leapfrogs immediately to the cleanest possible, overreaching technologies.

  8. Energizing Local Values For Tourism Services Improvement

    Directory of Open Access Journals (Sweden)

    Budi Purnomo

    2012-06-01

    Full Text Available People in most cultures would probably agree that politeness is needed during their interaction. However there may be differing opinions as to when they should be polite. In tourism industry, tourism service providers’ act as hosts and tourists act as guests. Typically hosts will try to act politely and use appropriate politeness norms when serving guests to ensure their satisfaction. The research findings show that the tourism service providers in Central Java use various unggah-ungguh ‘politeness norms’ when serving English speaking tourists and Indonesian speaking tourists. Besides that, there are some violations made by the tourism service providers in using unggah-ungguh ‘politeness norms’. The research findings also show that there are similar and different perspectives on unggah-ungguh ‘politeness norms’ between English speaking tourists with Western culture backgrounds and Indonesian speaking tourists with Indonesian culture backgrounds towards the politeness norms used by the tourism service providers in Central Java. The findings imply the needs of energizing unggah-ungguh ‘politeness norms’ which is discovered from well known noble Javanese values used by the tourism service providers for tourism service improvement.

  9. Energizing porters by proton-motive force.

    Science.gov (United States)

    Nelson, N

    1994-11-01

    It is generally accepted that the chemistry of water was the most crucial determinant in shaping life on earth. Among the more important chemical features of water is its dissociation into protons and hydroxyl ions. The presence of relatively high proton concentrations in the ambient solution resulted in the evolution of proton pumps during the dawn of life on earth. These proton pumps maintained neutral pH inside the cells and generated electrochemical gradients of protons (proton-motive force) across their membranes. The existence of proton-motive force enabled the evolution of porters driven by it that are most probably among the more primitive porters in the world. The directionality of the substrate transport by the porters could be to both sides of the membranes because they can serve as proton symporters or antiporters. One of the most important subjects of this meeting is the mechanism by which proton-motive and other ion-motive forces drive the transport processes through porters. Is there a common mechanism of action for all proton-driven porters? Is there some common partial reaction by which we can identify the way that porters are energized by proton-motive force? Is there a common coupling between proton movement and uptake or secretion of certain molecules? Even a partial answer to one of these questions would advance our knowledge... or confusion. As my mentor Efraim Racker used to say: 'If you are not totally confused you do not understand the issue'.

  10. Design and Implementation of Energized Fracture Treatment in Tight Gas Sands

    Energy Technology Data Exchange (ETDEWEB)

    Mukul Sharma; Kyle Friehauf

    2009-12-31

    Hydraulic fracturing is essential for producing gas and oil at an economic rate from low permeability sands. Most fracturing treatments use water and polymers with a gelling agent as a fracturing fluid. The water is held in the small pore spaces by capillary pressure and is not recovered when drawdown pressures are low. The un-recovered water leaves a water saturated zone around the fracture face that stops the flow of gas into the fracture. This is a particularly acute problem in low permeability formations where capillary pressures are high. Depletion (lower reservoir pressures) causes a limitation on the drawdown pressure that can be applied. A hydraulic fracturing process can be energized by the addition of a compressible, sometimes soluble, gas phase into the treatment fluid. When the well is produced, the energized fluid expands and gas comes out of solution. Energizing the fluid creates high gas saturation in the invaded zone, thereby facilitating gas flowback. A new compositional hydraulic fracturing model has been created (EFRAC). This is the first model to include changes in composition, temperature, and phase behavior of the fluid inside the fracture. An equation of state is used to evaluate the phase behavior of the fluid. These compositional effects are coupled with the fluid rheology, proppant transport, and mechanics of fracture growth to create a general model for fracture creation when energized fluids are used. In addition to the fracture propagation model, we have also introduced another new model for hydraulically fractured well productivity. This is the first and only model that takes into account both finite fracture conductivity and damage in the invaded zone in a simple analytical way. EFRAC was successfully used to simulate several fracture treatments in a gas field in South Texas. Based on production estimates, energized fluids may be required when drawdown pressures are smaller than the capillary forces in the formation. For this field

  11. City of Phoenix - Energize Phoenix Program

    Energy Technology Data Exchange (ETDEWEB)

    Laloudakis, Dimitrios J.

    2014-09-29

    Energize Phoenix (EPHX) was designed as an ambitious, large-scale, three-year pilot program to provide energy efficiency upgrades in buildings, along Phoenix’s new Light Rail Corridor – part of a federal effort to reduce energy consumption and stimulate job growth, while simultaneously reducing the country’s carbon footprint and promoting a shift towards a green economy. The program was created through a 2010 competitive grant awarded to the City of Phoenix who managed the program in partnership with Arizona State University (ASU), the state’s largest university, and Arizona Public Service (APS), the state’s largest electricity provider. The U.S. Department of Energy (DOE) Better Buildings Neighborhood Program (BBNP) and the American Recovery and Reinvestment Act (ARRA) of 2009 provided $25M in funding for the EPHX program. The Light Rail Corridor runs through the heart of downtown Phoenix, making most high-rise and smaller commercial buildings eligible to participate in the EPHX program, along with a diverse mix of single and multi-family residential buildings. To ensure maximum impact and deeper market penetration, Energize Phoenix was subdivided into three unique parts: i. commercial rebate program, ii. commercial financing program, and iii. residential program Each component was managed by the City of Phoenix in partnership with APS. Phoenix was fortunate to partner with APS, which already operated robust commercial and residential rebate programs within its service territory. Phoenix tapped into the existing utility contractor network, provided specific training to over 100 contracting firms, and leveraged the APS rebate program structure (energy efficiency funding) to launch the EPHX commercial and residential rebate programs. The commercial finance program was coordinated and managed through a contract with National Bank of Arizona, NBAZ, which also provided project capital leveraging EPHX finance funds. Working in unison, approved contractors

  12. Collision cross section calculations for polyatomic ions considering rotating diatomic/linear gas molecules

    International Nuclear Information System (INIS)

    Larriba-Andaluz, Carlos; Hogan, Christopher J.

    2014-01-01

    Structural characterization of ions in the gas phase is facilitated by measurement of ion collision cross sections (CCS) using techniques such as ion mobility spectrometry. Further information is gained from CCS measurement when comparison is made between measurements and accurately predicted CCSs for model ion structures and the gas in which measurements are made. While diatomic gases, namely molecular nitrogen and air, are being used in CCS measurement with increasingly prevalency, the majority of studies in which measurements are compared to predictions use models in which gas molecules are spherical or non-rotating, which is not necessarily appropriate for diatomic gases. Here, we adapt a momentum transfer based CCS calculation approach to consider rotating, diatomic gas molecule collisions with polyatomic ions, and compare CCS predictions with a diatomic gas molecule to those made with a spherical gas molecular for model spherical ions, tetra-alkylammonium ions, and multiply charged polyethylene glycol ions. CCS calculations are performed using both specular-elastic and diffuse-inelastic collisions rules, which mimic negligible internal energy exchange and complete thermal accommodation, respectively, between gas molecule and ion. The influence of the long range ion-induced dipole potential on calculations is also examined with both gas molecule models. In large part we find that CCSs calculated with specular-elastic collision rules decrease, while they increase with diffuse-inelastic collision rules when using diatomic gas molecules. Results clearly show the structural model of both the ion and gas molecule, the potential energy field between ion and gas molecule, and finally the modeled degree of kinetic energy exchange between ion and gas molecule internal energy are coupled to one another in CCS calculations, and must be considered carefully to obtain results which agree with measurements

  13. Polyad quantum numbers and multiple resonances in anharmonic vibrational studies of polyatomic molecules.

    Science.gov (United States)

    Krasnoshchekov, Sergey V; Stepanov, Nikolay F

    2013-11-14

    In the theory of anharmonic vibrations of a polyatomic molecule, mixing the zero-order vibrational states due to cubic, quartic and higher-order terms in the potential energy expansion leads to the appearance of more-or-less isolated blocks of states (also called polyads), connected through multiple resonances. Such polyads of states can be characterized by a common secondary integer quantum number. This polyad quantum number is defined as a linear combination of the zero-order vibrational quantum numbers, attributed to normal modes, multiplied by non-negative integer polyad coefficients, which are subject to definition for any particular molecule. According to Kellman's method [J. Chem. Phys. 93, 6630 (1990)], the corresponding formalism can be conveniently described using vector algebra. In the present work, a systematic consideration of polyad quantum numbers is given in the framework of the canonical Van Vleck perturbation theory (CVPT) and its numerical-analytic operator implementation for reducing the Hamiltonian to the quasi-diagonal form, earlier developed by the authors. It is shown that CVPT provides a convenient method for the systematic identification of essential resonances and the definition of a polyad quantum number. The method presented is generally suitable for molecules of significant size and complexity, as illustrated by several examples of molecules up to six atoms. The polyad quantum number technique is very useful for assembling comprehensive basis sets for the matrix representation of the Hamiltonian after removal of all non-resonance terms by CVPT. In addition, the classification of anharmonic energy levels according to their polyad quantum numbers provides an additional means for the interpretation of observed vibrational spectra.

  14. Molecular eigenstate spectroscopy: Application to the intramolecular dynamics of some polyatomic molecules in the 3000 to 7000 cm-1 region

    International Nuclear Information System (INIS)

    Perry, D.S.

    1991-05-01

    This project uses high resolution infrared spectroscopy to probe the mechanism of intramolecular vibrational redistribution (IVR) in isolated polyatomic molecules. We have found only vibrationally anharmonic coupling in the C-H stretch region of 1-butyne but rotationally mediated coupling is evident in similar spectra of ethanol. The ''keyhole'' model of IVR was developed to account for the similarities and differences between these molecules. The concepts of the model are being implemented numerically in random matrix calculations. A second F-center laser has been purchased and is now being set up to develop an infrared double resonance technique which can be applied to this problem. 4 refs., 5 figs

  15. Ion beam studies - part 4. The use of multiply-charged and polyatomic ions in an implantation accelerator

    International Nuclear Information System (INIS)

    Freeman, J.H.; Chivers, D.J.; Gard, G.A.

    1976-12-01

    Polyatomic and multiply-charged ion provide a convenient means of extending the energy range of an implanted accelerator. The molecular species are also of interest in certain special bombardment studies. This report considers some of the factors which affect the production and utilisation of such beams. It introduces the concepts of hetero- and auto-contamination, and particular attention is given to the modification of the charge or mass of the ions resulting from inelastic collisions in the various beams transport regions of the accelerator. (author)

  16. Adiabatic energization in the ring current and its relation to other source and loss terms

    Science.gov (United States)

    Liemohn, M. W.; Kozyra, J. U.; Clauer, C. R.; Khazanov, G. V.; Thomsen, M. F.

    2002-04-01

    The influence of adiabatic energization and deenergization effects, caused by particle drift in radial distance, on ring current growth rates and loss lifetimes is investigated. Growth and loss rates from simulation results of four storms (5 June 1991, 15 May 1997, 19 October 1998, and 25 September 1998) are examined and compared against the y component of the solar wind electric field (Ey,sw). Energy change rates with and without the inclusion of adiabatic energy changes are considered to isolate the influence of this mechanism in governing changes of ring current strength. It is found that the influence of adiabatic drift effects on the energy change rates is very large when energization and deenergization are considered separately as gain and loss mechanisms, often about an order of magnitude larger than all other source or loss terms combined. This is true not only during storm times, when the open drift path configuration of the hot ions dominates the physics of the ring current, but also during quiet times, when the small oscillation in L of the closed trajectories creates a large source and loss of energy each drift orbit. However, the net energy change from adiabatic drift is often smaller than other source and loss processes, especially during quiet times. Energization from adiabatic drift dominates ring current growth only during portions of the main phase of storms. Furthermore, the net-adiabatic energization is often positive, because some particles are lost in the inner magnetosphere before they can adiabatically deenergize. It is shown that the inclusion of only this net-adiabatic drift effect in the total source rate or loss lifetime (depending on the sign of the net-adiabatic energization) best matches the observed source and loss values from empirical Dst predictor methods (that is, for consistency, these values should be compared between the calculation methods). While adiabatic deenergization dominates the loss timescales for all Ey,sw values

  17. Estudio de la autosuficiencia energética de una vivienda unifamiliar

    OpenAIRE

    Zeggaf, Itimad

    2015-01-01

    El título del proyecto es “Estudio de la autosuficiencia energética de una vivienda unifamiliar”. Una vivienda energéticamente autosuficiente no puede depender de ningún tipo de compañía para satisfacer las necesidades energéticas del usuario. Este proyecto estudia las necesidades energéticas de una vivienda unifamiliar habitada por 4 personas, planteando una solución que abastezca sus necesidades energéticas mediante las energías renovables. También se estudia el aprovechamiento del agua ...

  18. La energía que requiere nuestro territorio

    OpenAIRE

    Pacheco, Máximo

    2015-01-01

    En esta columna de opinión, el Ministro de Energía nos invita a enfrentarnos a un problema crucial para un país como Chile: sin energía a precios razonables, esa desigualdad social que tanto criticamos terminará por expandirse. Pero a la vez el Ministro nos invita a cambiar el foco, y así «transformar la energía en un ecualizador de la igualdad», con un Estado más activo en la solución de esta crucial problemática. In this op-ed piece, the Minister of Energy invites us to face a crucial pr...

  19. Control Operator for the Two-Dimensional Energized Wave Equation

    Directory of Open Access Journals (Sweden)

    Sunday Augustus REJU

    2006-07-01

    Full Text Available This paper studies the analytical model for the construction of the two-dimensional Energized wave equation. The control operator is given in term of space and time t independent variables. The integral quadratic objective cost functional is subject to the constraint of two-dimensional Energized diffusion, Heat and a source. The operator that shall be obtained extends the Conjugate Gradient method (ECGM as developed by Hestenes et al (1952, [1]. The new operator enables the computation of the penalty cost, optimal controls and state trajectories of the two-dimensional energized wave equation when apply to the Conjugate Gradient methods in (Waziri & Reju, LEJPT & LJS, Issues 9, 2006, [2-4] to appear in this series.

  20. Spatially Localized Particle Energization by Landau Damping in Current Sheets

    Science.gov (United States)

    Howes, G. G.; Klein, K. G.; McCubbin, A. J.

    2017-12-01

    Understanding the mechanisms of particle energization through the removal of energy from turbulent fluctuations in heliospheric plasmas is a grand challenge problem in heliophysics. Under the weakly collisional conditions typical of heliospheric plasma, kinetic mechanisms must be responsible for this energization, but the nature of those mechanisms remains elusive. In recent years, the spatial localization of plasma heating near current sheets in the solar wind and numerical simulations has gained much attention. Here we show, using the innovative and new field-particle correlation technique, that the spatially localized particle energization occurring in a nonlinear gyrokinetic simulation has the velocity space signature of Landau damping, suggesting that this well-known collisionless damping mechanism indeed actively leads to spatially localized heating in the vicinity of current sheets.

  1. An On-the-Fly Surface-Hopping Program JADE for Nonadiabatic Molecular Dynamics of Polyatomic Systems: Implementation and Applications.

    Science.gov (United States)

    Du, Likai; Lan, Zhenggang

    2015-04-14

    Nonadiabatic dynamics simulations have rapidly become an indispensable tool for understanding ultrafast photochemical processes in complex systems. Here, we present our recently developed on-the-fly nonadiabatic dynamics package, JADE, which allows researchers to perform nonadiabatic excited-state dynamics simulations of polyatomic systems at an all-atomic level. The nonadiabatic dynamics is based on Tully's surface-hopping approach. Currently, several electronic structure methods (CIS, TDHF, TDDFT(RPA/TDA), and ADC(2)) are supported, especially TDDFT, aiming at performing nonadiabatic dynamics on medium- to large-sized molecules. The JADE package has been interfaced with several quantum chemistry codes, including Turbomole, Gaussian, and Gamess (US). To consider environmental effects, the Langevin dynamics was introduced as an easy-to-use scheme into the standard surface-hopping dynamics. The JADE package is mainly written in Fortran for greater numerical performance and Python for flexible interface construction, with the intent of providing open-source, easy-to-use, well-modularized, and intuitive software in the field of simulations of photochemical and photophysical processes. To illustrate the possible applications of the JADE package, we present a few applications of excited-state dynamics for various polyatomic systems, such as the methaniminium cation, fullerene (C20), p-dimethylaminobenzonitrile (DMABN) and its primary amino derivative aminobenzonitrile (ABN), and 10-hydroxybenzo[h]quinoline (10-HBQ).

  2. Influence of sulfur-bearing polyatomic species on high precision measurements of Cu isotopic composition

    Science.gov (United States)

    Pribil, M.J.; Wanty, R.B.; Ridley, W.I.; Borrok, D.M.

    2010-01-01

    An increased interest in high precision Cu isotope ratio measurements using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) has developed recently for various natural geologic systems and environmental applications, these typically contain high concentrations of sulfur, particularly in the form of sulfate (SO42-) and sulfide (S). For example, Cu, Fe, and Zn concentrations in acid mine drainage (AMD) can range from 100??g/L to greater than 50mg/L with sulfur species concentrations reaching greater than 1000mg/L. Routine separation of Cu, Fe and Zn from AMD, Cu-sulfide minerals and other geological matrices usually incorporates single anion exchange resin column chromatography for metal separation. During chromatographic separation, variable breakthrough of SO42- during anion exchange resin column chromatography into the Cu fractions was observed as a function of the initial sulfur to Cu ratio, column properties, and the sample matrix. SO42- present in the Cu fraction can form a polyatomic 32S-14N-16O-1H species causing a direct mass interference with 63Cu and producing artificially light ??65Cu values. Here we report the extent of the mass interference caused by SO42- breakthrough when measuring ??65Cu on natural samples and NIST SRM 976 Cu isotope spiked with SO42- after both single anion column chromatography and double anion column chromatography. A set of five 100??g/L Cu SRM 976 samples spiked with 500mg/L SO42- resulted in an average ??65Cu of -3.50?????5.42??? following single anion column separation with variable SO42- breakthrough but an average concentration of 770??g/L. Following double anion column separation, the average SO42-concentration of 13??g/L resulted in better precision and accuracy for the measured ??65Cu value of 0.01?????0.02??? relative to the expected 0??? for SRM 976. We conclude that attention to SO42- breakthrough on sulfur-rich samples is necessary for accurate and precise measurements of ??65Cu and may require

  3. Energía Minihidráulica

    OpenAIRE

    Mancebo Piqueras, José Antonio; Adrada Guerra, Teodoro; Martinez, Carmen

    2013-01-01

    La energía basada en turbinas hidráulicas de reducida potencia es, a menudo, un ejemplo- modelo dentro del campo de las energías renovables desde su aparición a finales del S. XIX, aunque los ingenios precursores surgen mucho antes. Entre los testimonios más antiguos destacan la saqia o rueda persa y la rueda hidráulica romana que había sido previamente implementada en Extremo Oriente, y que después llega a Europa a través de Egipto. Más tarde, durante la Edad Media y el Renacimiento, se gene...

  4. Energía y cambio climático

    OpenAIRE

    Wilfredo Bulege Gutiérrez

    2014-01-01

    Es claro que el crecimiento de la población, la extracción de materiales, la producción alimentaria y el incremento de energía para todas las actividades humanas nos conducen a un estado de colisión con las capacidades de la biosfera y los ecosistemas en el proceso de asegurar la provisión de bienes y servicios indispensables para la vida (1). La producción de energía convencional y contaminante es hoy una de las más graves en este escenario, tanto que la comunidad internacional y las potenci...

  5. Panorama energético mundial y argentino

    OpenAIRE

    Guadagni, Alieto

    2007-01-01

    Estamos transitando aceleradamente de una etapa caracterizada por energía abundante, barata y exportada a otra etapa signada por la escasez, el alto costo y las importaciones. Esta es la triple tenaza energética que enfrenta la Argentina. Los actuales precios del petróleo están impulsando la producción de biocombustibles (biodiesel y etanol) en Brasil, la Unión Europea y los Estados Unidos, pero también muchos otros países como el nuestro. Se estima que su participación en el consumo mundi...

  6. Energía y cambio climático

    Directory of Open Access Journals (Sweden)

    Wilfredo Bulege Gutiérrez

    2014-06-01

    Full Text Available Es claro que el crecimiento de la población, la extracción de materiales, la producción alimentaria y el incremento de energía para todas las actividades humanas nos conducen a un estado de colisión con las capacidades de la biosfera y los ecosistemas en el proceso de asegurar la provisión de bienes y servicios indispensables para la vida (1. La producción de energía convencional y contaminante es hoy una de las más graves en este escenario, tanto que la comunidad internacional y las potencias ya han empezado a dar muestras de preocupación por la seguridad energética y, con ello por la amenaza del cambio climático. En el actual cambio climático por primera vez se viene demostrando que la humanidad ha cambiado decisivamente un ciclo liberando CO2 a la atmósfera a través de la quema de combustibles fósiles y cambios en el uso del suelo por más de 500 000 años. El origen del cambio climático se remonta a dos grandes transformaciones en el uso de la energía. En primer lugar, la energía hidráulica fue reemplazada por el carbón, una fuente de energía condensada por la naturaleza a lo largo de millones de años. Fue el aprovechamiento del carbón para nuevas tecnologías lo que propulsó la revolución industrial y desató aumentos sin precedentes en la productividad. La segunda gran transformación ocurrió 150 años más tarde. El petróleo había sido una fuente de energía humana durante milenios. En China, por ejemplo, se registran pozos petroleros ya en el siglo IV. No obstante, la utilización del petróleo para los motores de combustión interna a comienzos del siglo XX marcó el inicio de una revolución en el transporte. La quema de carbón y petróleo, junto con el gas natural, ha transformado a las sociedades humanas al proveerle la energía impulsora de grandes aumentos en la riqueza y la productividad, pero también ha impulsado el cambio climático (2. La economía humana ha crecido vertiginosamente, se multiplic

  7. Prospects of using the second-order perturbation theory of the MP2 type in the theory of electron scattering by polyatomic molecules

    Energy Technology Data Exchange (ETDEWEB)

    Čársky, Petr [J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.i.i., Dolejškova 3, 18223 Prague 8 (Czech Republic)

    2015-01-22

    So far the second-order perturbation theory has been only applied to the hydrogen molecule. No application was attempted for another molecule, probably because of technical difficulties of such calculations. The purpose of this contribution is to show that the calculations of this type are now feasible on larger polyatomic molecules even on commonly used computers.

  8. En cumplimiento con la orden ejecutiva del presidente Trump sobre la Independencia Energética

    Science.gov (United States)

    Acciones reglamentarias tomadas por la EPA, incluyendo audiencias públicas, para implementar la Orden Ejecutiva sobre la Independencia Energética y la propuesta derogación del Plan de Energía Limpia.

  9. Ponte en onda: prende la energía limpia, (Spanish) Get Current

    Energy Technology Data Exchange (ETDEWEB)

    None

    2015-05-01

    Cambiar a tecnologías de energía limpia significa que fortalecemos la economía y protegemos al medio ambiente. Este libreto de actividades educativas para todas las edades promueve el uso consciente de la energía, con datos de distintas formas de energía aplicables y una variedad de rompecabezas y crucigramas en temas energéticos.

  10. La educación energética una prioridad para el milenio

    Directory of Open Access Journals (Sweden)

    Johnn Edgar Castro

    2015-01-01

    Full Text Available Este articulo plantea la necesidad  de reflexionar y trabajar en el desarrollo de propuestas sobre educación energética, desde cuatro enfoques fundamentalmente: la primera de ellas  es la inevitable dependencia de las sociedades humanas de las fuentes de energía; el ahorro energético; el agotamiento de las fuentes de energía y por ultimo las consecuencias sobre el medioambiente

  11. Removal of phenol from water : a comparison of energization methods

    NARCIS (Netherlands)

    Grabowski, L.R.; Veldhuizen, van E.M.; Rutgers, W.R.

    2005-01-01

    Direct electrical energization methods for removal of persistent substances from water are under investigation in the framework of the ytriD-project. The emphasis of the first stage of the project is the energy efficiency. A comparison is made between a batch reactor with a thin layer of water and

  12. 30 CFR 75.705-2 - Repairs to energized surface high-voltage lines.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Repairs to energized surface high-voltage lines... Repairs to energized surface high-voltage lines. An energized high-voltage surface line may be repaired... on power circuits with a phase-to-phase nominal voltage no greater than 15,000 volts; (3) Such...

  13. Experimental studies of the kinetics of small polyatomic free radicals in combustion reactions; Moniatomisten radikaalien kinetiikka palamisreaktioissa, kokeellinen tutkimus

    Energy Technology Data Exchange (ETDEWEB)

    Seetula, J. [Helsinki Univ. (Finland). Lab. of Physical Chemistry

    1996-12-01

    The kinetics of the reactions of CH{sub 2}Cl, CHClBr, CH{sub 3}CCl{sub 2} and CCl{sub 3}, with Cl{sub 2} has been investigated in a tubular reactor coupled to a photoionization mass spectrometer. The radicals of interest, R, were generated homogeneously in the reactor by pulse 248 nm exciplex laser photolysis. The decay of R was monitored as a function of Cl{sub 2} concentration under pseudo-first-order condition to determine the rate constant as a function of temperature pressure. The reactions were studied separately over a temperature range up to a temperature of 873 K. The rate constants of CH{sub 2}Cl, CHClBr and CH{sub 3}CCl{sub 2} radicals determined were fitted to three-parameter Arrhenius-type expression (with units of cm{sup 3} molecule{sup -1} s{sup -1}): k(CH{sub 2}Cl) = 1.05x10{sup -16} x (T){sup 1.4} x exp(-357 J mol{sup -1} / RT), k(CHClBr) = 5.83x10{sup -20} x (T){sup 2.3} x exp(-300 J mol{sup -1}/ RT) and k(CH{sub 3}CCl{sub 2}) 1.10x10{sup -}2{sup 6} x (T){sup 4.3} x exp(15000 J mol{sup -1}/ RT). The rate constants CCl{sub 3} radical were fitted to a two-parameter Arrhenius expression (units in cm{sup 3} molecule{sup -1} s{sup -1}): k(CCl{sub 3}) = (8.1 +- 6.7)10{sup -l3} exp[-(25.0 +- 8.7) kJ mol{sup -1}/ RT]. An Arrhenius expression for the reaction of Cl+CCl{sub 4} -> <- CCl{sub 3}+Cl{sub 2} is also obtained from the kinetics of the reaction of CCl{sub 3} radical with Cl{sub 2} combined with the known heat of formation and entropy values of CCl{sub 3} free radical to be as follows (in units cm{sup 3} molecule{sup -1-}5 s{sup -1}): k(Cl+CCl{sub 4}) = (3.9 + 3.2)10{sup -10} exp[-(71 + 9) kJ mol{sup -1}/ RT]. The error limits stated are l{sigma}+Student`s t and base on statistical uncertainties only. (author)

  14. Oxides with polyatomic anions considered as new electrolyte materials for solid oxide fuel cells (SOFCs)

    Energy Technology Data Exchange (ETDEWEB)

    Bin Hassan, Oskar Hasdinor

    2010-10-21

    Materials with Polyatomic anions of [Al{sub 2}O{sub 7}]{sup -8}, [Ti{sub 2}O{sub 8}]{sup -8} and [P{sub 2}O{sub 7}]{sup -4} were investigated with respect to their ionic conductivity properties as well as its thermal expansion properties with the aim to use them as SOFCs electrolytes. The polyatomic anion groups selected from the oxy-cuspidine family of Gd{sub 4}Al{sub 2}O{sub 9} and Gd{sub 4}Ti{sub 2}O{sub 10} as well as from pyrophosphate SnP{sub 2}O{sub 7}. The pure oxy-cuspidine Gd{sub 4}Al{sub 2}O{sub 9}, the series of Gd{sub 4}Al{sub 2-x}Mg{sub x}O{sub 9-x/2} with x=0.10-1.0 and Gd{sub 4-x}M{sub x}Al{sub 2}O{sub 9-x/2} (M=Ca, Sr) with x = 0.05-0.5 were prepared successfully by the citrate complexation method. All samples showed the crystal structure of monoclinic oxycuspidine structure with space group of P2{sub 1/c} and Z=4. No solid solution was observed for Gd{sub 4}Al{sub 2-x}Mg{sub x}O{sub 9-x/2} where additional phases of Gd{sub 2}O{sub 3} and MgO were presence. XRD semiquantitative analysis together with SEM-EDX analysis revealed that Mg{sup 2+} was not able to substitute the Al{sup 3+} ions even at low Mg{sup 2+} concentration. The solid solution limit of Gd{sub 4-x}Ca{sub x}Al{sub 2}O{sub 9-x/2} and Gd{sub 4-x}Sr{sub x}Al{sub 2}O{sub 9-x/2} was determined between 0.05-0.10 and 0.01-0.05 mol for Ca and Sr, respectively. Beyond the substitution limit Gd{sub 4}Al{sub 2}O{sub 9}, GdAlO{sub 3} and SrGd{sub 2}Al{sub 2}O{sub 7} appeared as additional phases. The highest electrical conductivity obtained at 900 C yielded {sigma}= 1.49 x 10{sup -4}Scm{sup -1} for Gd{sub 3.95}Ca{sub 0.05}Al{sub 2}O{sub 8.98}. In comparison, the conductivity of pure Gd{sub 4}Al{sub 2}O{sub 9} was {sigma}= 1.73 x 10{sup -5} Scm{sup -1}. The conductivities determined were in a similar range as those of other cuspidine materials investigated previously. The thermal expansion coefficient of Gd{sub 4}Al{sub 2}O{sub 9} at 1000 C was 7.4 x 10{sup -6}K{sup -1}. The earlier reported

  15. Estudio energético del sistema eléctrico en Ecuador. Impulso a la Energía Solar Fotovoltaica

    OpenAIRE

    Eras Almeida, Andrea Alejandra

    2012-01-01

    La realización de este proyecto en base a la legislación que promueve el desarrollo de la energía limpia, pretende mostrar los cambios que tendrá la matriz energética del Ecuador si se impone un aporte renovable a la producción de energía y sus beneficios con sus futuros proyectos emblemáticos. Así también, pretende el impulso a la energía solar fotovolataica a nivel de construcciones fijas, con inversión privada y para beneficio de la sociedad misma.

  16. Evaluación del potencial energético del oleaje en Madagascar

    OpenAIRE

    Araujo Roso, Giovanni

    2017-01-01

    La energía undimotriz, o energía del oleaje, es aquella que aprovecha la energía cinética de la perturbación de la superficie del mar y está considerada como una fuente de gran potencial. Las ventajas de este tipo de recurso respecto a otras energías renovables son variadas: sus eventos son predecibles con detalle, el despliegue de dispositivos tiene un impacto visual inferior a otros y es un recurso inagotable, entre otros. Por otra parte, el campo de la energía del oleaje se ...

  17. Sistema de Aprovechamiento de la Energía de las Olas del Mar

    OpenAIRE

    Pi Amorós, Gabriel

    2010-01-01

    Este documento describe un sistema de aprovechamiento de la energía transportada por el oleaje o energía undimotriz. El sistema no transformará la energía únicamente en electricidad si no que aprovecha dicha electricidad para producir hidrógeno mediante el proceso de la electrólisis del agua de mar. Es decir, el sistema propuesto es un sistema de generación de hidrógeno de origen renovable a partir de una fuente de energía renovable, la energía undimotriz. Las característica...

  18. Validations of CNDOL approximate Hamiltonian as a fast and reliable method to obtain vertical excitation energies in polyatomic systems

    International Nuclear Information System (INIS)

    Montero-Alejo, Ana L.; Gonzalez-Santana, Susana; Montero-Cabrera, Luis A.; Hernandez-Rodriguez, Erix Wiliam; Fuentes-Montero, Maria Elena; Bunge-Molina, Carlos F.; Gonzalez, Augusto

    2008-01-01

    Theoretical prediction of vertical excitation energies and an estimation of charge distributions of polyatomic systems can be calculated, through the configuration interaction of single (CIS) excited determinants procedure, with the CNDOL (Complete Neglect of Differential Overlap considering the l azimuthal quantum number) Hamiltonians. This method does not use adjusted parameters to fit experimental data and only employ a priori data on atomic orbitals and simple formulas to substitute large computations of electronic integrals. In this sense, different functions for bi-electron integrals have been evaluated in order to improve the approximate Hamiltonian. The reliability of predictions and theoretical consistence has been tested with a benchmark set of organic molecules that covers important classes of chromophores including polyenes and other unsaturated aliphatic compounds, aromatic, hydrocarbons, heterocycles, carbonyl compounds, and nucleobases. The calculations are done at identical geometries (MP2) with the same basis set (6-31G) for these medium-sized molecules and the obtained results were statistically compared with other analogous methods and experimental data. The accuracy of prediction of each CNDOL vertical transitions energy increases while the active space is more complete allowing the best variational optimization of CIS matrices i.e. molecular excited states. Moreover and due to the feasible computation procedure for large polyatomic systems, the studies have been extended, as a preliminary work, in the field of optoelectronic materials for photovoltaic applications. Hence, the excitation energies of different conjugated Phenyl-cored Thiophene Dendrimers optimized by DFT (Density Functional Theory) were calculated and show good agreement with the experiment data. The predicted charge distribution during the excitation contributes to understand the photophysics process on these kind materials. (Full text)

  19. Stochastic Fermi Energization of Coronal Plasma during Explosive Magnetic Energy Release

    Science.gov (United States)

    Pisokas, Theophilos; Vlahos, Loukas; Isliker, Heinz; Tsiolis, Vassilis; Anastasiadis, Anastasios

    2017-02-01

    The aim of this study is to analyze the interaction of charged particles (ions and electrons) with randomly formed particle scatterers (e.g., large-scale local “magnetic fluctuations” or “coherent magnetic irregularities”) using the setup proposed initially by Fermi. These scatterers are formed by the explosive magnetic energy release and propagate with the Alfvén speed along the irregular magnetic fields. They are large-scale local fluctuations (δB/B ≈ 1) randomly distributed inside the unstable magnetic topology and will here be called Alfvénic Scatterers (AS). We constructed a 3D grid on which a small fraction of randomly chosen grid points are acting as AS. In particular, we study how a large number of test particles evolves inside a collection of AS, analyzing the evolution of their energy distribution and their escape-time distribution. We use a well-established method to estimate the transport coefficients directly from the trajectories of the particles. Using the estimated transport coefficients and solving the Fokker-Planck equation numerically, we can recover the energy distribution of the particles. We have shown that the stochastic Fermi energization of mildly relativistic and relativistic plasma can heat and accelerate the tail of the ambient particle distribution as predicted by Parker & Tidman and Ramaty. The temperature of the hot plasma and the tail of the energetic particles depend on the mean free path (λsc) of the particles between the scatterers inside the energization volume.

  20. Stochastic Fermi Energization of Coronal Plasma during Explosive Magnetic Energy Release

    Energy Technology Data Exchange (ETDEWEB)

    Pisokas, Theophilos; Vlahos, Loukas; Isliker, Heinz; Tsiolis, Vassilis [Department of Physics, Aristotle University of Thessaloniki GR-52124 Thessaloniki (Greece); Anastasiadis, Anastasios [Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens GR-15236 Penteli (Greece)

    2017-02-01

    The aim of this study is to analyze the interaction of charged particles (ions and electrons) with randomly formed particle scatterers (e.g., large-scale local “magnetic fluctuations” or “coherent magnetic irregularities”) using the setup proposed initially by Fermi. These scatterers are formed by the explosive magnetic energy release and propagate with the Alfvén speed along the irregular magnetic fields. They are large-scale local fluctuations ( δB / B ≈ 1) randomly distributed inside the unstable magnetic topology and will here be called Alfvénic Scatterers (AS). We constructed a 3D grid on which a small fraction of randomly chosen grid points are acting as AS. In particular, we study how a large number of test particles evolves inside a collection of AS, analyzing the evolution of their energy distribution and their escape-time distribution. We use a well-established method to estimate the transport coefficients directly from the trajectories of the particles. Using the estimated transport coefficients and solving the Fokker–Planck equation numerically, we can recover the energy distribution of the particles. We have shown that the stochastic Fermi energization of mildly relativistic and relativistic plasma can heat and accelerate the tail of the ambient particle distribution as predicted by Parker and Tidman and Ramaty. The temperature of the hot plasma and the tail of the energetic particles depend on the mean free path ( λ {sub sc}) of the particles between the scatterers inside the energization volume.

  1. Pick-up ion energization at the termination shock

    Energy Technology Data Exchange (ETDEWEB)

    Gary, S Peter [Los Alamos National Laboratory; Winske, Dan [Los Alamos National Laboratory; Wu, Pin [BOSTON UNIV.; Schwadron, N A [BOSTON UNIV.

    2009-01-01

    One-dimensional hybrid simulations are used to investigate how pickup ions are energized at the perpendicular termination shock. Contrary to previous models based on pickup ion energy gain by repeated crossings of the shock front (shock surfing) or due to a reforming shock front, the present simulations show that pickup ion energy gain involves a gyro-phasedependent interaction with the inhomogeneous motional electric field at the shock. The process operates at all relative concentrations of pickup ion density.

  2. Monitoring, Analyzing and Assessing Radiation Belt Loss and Energization

    Science.gov (United States)

    Daglis, I.; Balasis, G.; Bourdarie, S.; Horne, R.; Khotyaintsev, Y.; Mann, I.; Santolik, O.; Turner, D.; Anastasiadis, A.; Georgiou, M.; Giannakis, O.; Papadimitriou, C.; Ropokis, G.; Sandberg, I.; Angelopoulos, V.; Glauert, S.; Grison, B., Kersten T.; Kolmasova, I.; Lazaro, D.; Mella, M.; Ozeke, L.; Usanova, M.

    2013-09-01

    We present the concept, objectives and expected impact of the MAARBLE (Monitoring, Analyzing and Assessing Radiation Belt Loss and Energization) project, which is being implemented by a consortium of seven institutions (five European, one Canadian and one US) with support from the European Community's Seventh Framework Programme. The MAARBLE project employs multi-spacecraft monitoring of the geospace environment, complemented by ground-based monitoring, in order to analyze and assess the physical mechanisms leading to radiation belt particle energization and loss. Particular attention is paid to the role of ULF/VLF waves. A database containing properties of the waves is being created and will be made available to the scientific community. Based on the wave database, a statistical model of the wave activity dependent on the level of geomagnetic activity, solar wind forcing, and magnetospheric region will be developed. Multi-spacecraft particle measurements will be incorporated into data assimilation tools, leading to new understanding of the causal relationships between ULF/VLF waves and radiation belt dynamics. Data assimilation techniques have been proven as a valuable tool in the field of radiation belts, able to guide 'the best' estimate of the state of a complex system. The MAARBLE (Monitoring, Analyzing and Assessing Radiation Belt Energization and Loss) collaborative research project has received funding from the European Union’s Seventh Framework Programme (FP7-SPACE-2011-1) under grant agreement no. 284520.

  3. Laser ablation-inductively coupled plasma-mass spectrometry: Examinations of the origins of polyatomic ions and advances in the sampling of particulates

    Energy Technology Data Exchange (ETDEWEB)

    Witte, Travis [Iowa State Univ., Ames, IA (United States)

    2011-01-01

    This dissertation provides a general introduction to Inductively coupled plasma-mass spectrometry (ICP-MS) and laser ablation (LA) sampling, with an examination of analytical challenges in the employment of this technique. It discusses the origin of metal oxide ions (MO+) in LA-ICP-MS, as well as the effect of introducing helium and nitrogen to the aerosol gas flow on the formation of these polyatomic interferences. It extends the study of polyatomic ions in LA-ICP-MS to metal argide (MAr+) species, an additional source of possible significant interferences in the spectrum. It describes the application of fs-LA-ICP-MS to the determination of uranium isotope ratios in particulate samples.

  4. Combined treatment of SO2 and high resistivity fly ash using a pulse energized electron reactor

    International Nuclear Information System (INIS)

    Mizuno, A.; Clements, J.S.; Davis, R.H.

    1984-01-01

    The combined removal of SO 2 and high resistivity fly ash has been demonstrated in a pulse energized electron reactor (PEER). The PEER system which was originally developed for the removal of SO 2 utilizes a positive pulse streamer corona discharge in a non-uniform field geometry. In performance tests on SO 2 , more than 90% was removed with an advantageously small power requirement. Combined treatment performance was demonstrated by introducing high resistivity fly ash into the test gas and the PEER is significantly more efficient than a conventional electrostatic precipitator operated with a dc voltage. Observations show that the PEER agglomerates the fly ash and further that the SO 2 removal efficiency is improved by the presence of fly ash. The electrode configuration and performance results make retrofit consideration attractive

  5. La energía humana el esfuerzo físico

    Directory of Open Access Journals (Sweden)

    Luis Suárez Flórez

    1991-01-01

    Full Text Available Se llama la atención sobre la energía humana, su importancia como elemento de productividad y como principio ó quizás como fin de la actividad deportiva. Se estudia el máximo esfuerzo físico, así como también algunos conceptos acerca de la energía aeróbica y la energía anaeróbica.

  6. Energization of Long HVAC Cables in Parallel - Analysis and Estimation Formulas

    DEFF Research Database (Denmark)

    Silva, Filipe Faria Da; Bak, Claus Leth

    2012-01-01

    The installation of long HVAC cables has recently become more common and it tends to increase during the next years. Consequently, the energization of long HVAC cables in parallel is also a more common condition. The energization of HVAC cables in parallel resembles the en-ergization of capacitor...... has several simplifications and does not always provide accurate results. This paper proposes a new formula that can be used for the estimation of these two quantities for two HVAC cables in parallel....

  7. 30 CFR 77.704-2 - Repairs to energized high-voltage lines.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Repairs to energized high-voltage lines. 77.704... UNDERGROUND COAL MINES Grounding § 77.704-2 Repairs to energized high-voltage lines. An energized high-voltage... repairs will be performed on power circuits with a phase-to-phase nominal voltage no greater than 15,000...

  8. Energía Undimotriz, alternativa para la producción de Energía Eléctrica en la Provincia de Santa Elena

    Directory of Open Access Journals (Sweden)

    Rolando Calero

    2015-10-01

    Full Text Available La energía undimotriz, es la energía que permite obtener electricidad a partir de energía mecánica generada por el movimiento de las olas. Es uno de los tipos de energías renovables con más recientes estudios, y presenta enormes ventajas frente a otras energías renovables debido a que se tendría mayor facilidad para predecir condiciones geológicas óptimas que permitan la mayor eficiencia en sus procesos. Debido a que es más fácil llegar a predecir condiciones óptimas de oleaje, en comparación con la obtenida con  los vientos para obtener energía eólica, donde su variabilidad es menor.En este trabajo se espera aportar y dilucidar con datosespecíficos sobre la morfología de la zonamarítima en la provincia de Santa Elena, tratando depredecir si las características propias del lugar son idóneas  para producir electricidad en base a la implementación de energíaundimotriz, como fuente renovable no convencional utilizando las tecnologías actuales para este propósito.

  9. Obtención de energía a partir de las corrientes marinas

    OpenAIRE

    Echeverría Cabodevilla, Álvaro

    2017-01-01

    El objetivo del proyecto es evaluar la viabilidad de una granja de energía hidrocinética en los territorios marinos españoles. Como se puede observar en el desarrollo del estudio, el resultado es negativo. En España no existe una gran zona que pueda ser utilizada para crear una granja de energía hidrocinética. La energía hidrocinética es aquella que utiliza la energía cinética del agua marina para obtener electricidad, principalmente los movimientos de agua de las corrientes ma...

  10. Auditoría energética en una planta de tratamiento de agua potable

    OpenAIRE

    Díaz Álvarez, Silvino

    2012-01-01

    En el panorama energético actual, con las recientes incertidumbres asociadas a los precios de la energía y las inestabilidades políticas en algunos países exportadores de hidrocarburos, reducir el consumo energético mediante tecnologías más eficientes es fundamental en la definición de nuevos usos de la energía en nuestra sociedad. Dada la actual coyuntura medioambiental, económica y social, hemos de encontrar un nuevo modelo de desarrollo sostenible, incrementando la productividad de nuestra...

  11. La Demanda Residencial por Energía Eléctrica en Chile

    OpenAIRE

    Claudio A Agostini; Cecilia Plottier; Eduardo Saavedra

    2011-01-01

    En un contexto de demanda creciente y oferta estocástica de energía en Chile se hace necesario conocer a cabalidad los determinantes de la demanda por energía eléctrica de los hogares - en particular su elasticidad precio - para así utilizar mecanismos de flexibilización de precios con miras a reducir posibles déficits de energía. Este trabajo estima la demanda de energía eléctrica residencial usando información de la Encuesta de Caracterización Socioeconómica Nacional (CASEN) 2006, siendo in...

  12. Medidas de mejora de la eficiencia energética de edificios residenciales

    OpenAIRE

    Hernández Sánchez, Juan Manuel

    2012-01-01

    El parque de edificios residenciales existente tiene un potencial muy grande para mejorar la eficiencia energética a corto y medio plazo, debido al gran número de viviendas existentes y a su larga vida residual. Los factores que influyen directamente en el consumo energético y en las emisiones asociadas a los edificios residenciales son: la envolvente térmica, la eficiencia energética de los equipos, las fuentes energéticas utilizadas y el comportamiento de los usuarios. Las barreras qu...

  13. Importancia de las energías renovables en la seguridad energética y su relación con el crecimiento económico.

    Directory of Open Access Journals (Sweden)

    Lilian Paola Umbarila Valencia

    2015-12-01

    Full Text Available La creciente demanda de las necesidades sociales a nivel global, impulsada por los hábitos de vida y la forma en la que se organizan las regiones ha llevado al crecimiento paralelo de la industria y con ello al creciente aumento del consumo de energía. Este artículo de investigación reflexiona acerca de la relevancia que tienen las energías renovables para la seguridad energética, teniendo en cuenta la inestabilidad de los precios del petróleo y su influencia en el mercado de los hidrocarburos como fuente primaria de energía. Se evidencian los avances que han tenido las tecnologías de energías renovables a nivel global, regional y local y el rol que juegan en la independencia energética y en la mitigación del impacto ambiental. Se concluye que las naciones deben buscar la optimización de las energías renovables desde los ámbitos: local, regional y global propendiendo por su uso adecuado desde la legislación. El futuro de las energías renovables está dado por la rentabilidad, ya que para que el uso de éstas siga creciendo, deben seguir atrayendo capital lo cual significa que los inversores deben ver una rentabilidad competitiva. Otra recomendación importante es la integración de la energía renovable en la red, incluyendo fuentes de generación intermitentes e incluso imprevisibles. 

  14. Radiation signatures from a locally energized flaring loop

    Science.gov (United States)

    Emslie, A. G.; Vlahos, L.

    1980-01-01

    The radiation signatures from a locally energized solar flare loop based on the physical properties of the energy release mechanisms were consistent with hard X-ray, microwave, and EUV observations for plausible source parameters. It was found that a suprathermal tail of high energy electrons is produced by the primary energy release, and that the number of energetic charged particles ejected into the interplanetary medium in the model is consistent with observations. The radiation signature model predicts that the intrinsic polarization of the hard X-ray burst should increase over the photon energy range of 20 to 100 keV.

  15. Multi-layer Lanczos iteration approach to calculations of vibrational energies and dipole transition intensities for polyatomic molecules

    International Nuclear Information System (INIS)

    Yu, Hua-Gen

    2015-01-01

    We report a rigorous full dimensional quantum dynamics algorithm, the multi-layer Lanczos method, for computing vibrational energies and dipole transition intensities of polyatomic molecules without any dynamics approximation. The multi-layer Lanczos method is developed by using a few advanced techniques including the guided spectral transform Lanczos method, multi-layer Lanczos iteration approach, recursive residue generation method, and dipole-wavefunction contraction. The quantum molecular Hamiltonian at the total angular momentum J = 0 is represented in a set of orthogonal polyspherical coordinates so that the large amplitude motions of vibrations are naturally described. In particular, the algorithm is general and problem-independent. An application is illustrated by calculating the infrared vibrational dipole transition spectrum of CH based on the ab initio T8 potential energy surface of Schwenke and Partridge and the low-order truncated ab initio dipole moment surfaces of Yurchenko and co-workers. A comparison with experiments is made. The algorithm is also applicable for Raman polarizability active spectra

  16. A simple model for correcting the zero point energy problem in classical trajectory simulations of polyatomic molecules

    International Nuclear Information System (INIS)

    Miller, W.H.; Hase, W.L.; Darling, C.L.

    1989-01-01

    A simple model is proposed for correcting problems with zero point energy in classical trajectory simulations of dynamical processes in polyatomic molecules. The ''problems'' referred to are that classical mechanics allows the vibrational energy in a mode to decrease below its quantum zero point value, and since the total energy is conserved classically this can allow too much energy to pool in other modes. The proposed model introduces hard sphere-like terms in action--angle variables that prevent the vibrational energy in any mode from falling below its zero point value. The algorithm which results is quite simple in terms of the cartesian normal modes of the system: if the energy in a mode k, say, decreases below its zero point value at time t, then at this time the momentum P k for that mode has its sign changed, and the trajectory continues. This is essentially a time reversal for mode k (only exclamation point), and it conserves the total energy of the system. One can think of the model as supplying impulsive ''quantum kicks'' to a mode whose energy attempts to fall below its zero point value, a kind of ''Planck demon'' analogous to a Brownian-like random force. The model is illustrated by application to a model of CH overtone relaxation

  17. La energía minihidráulica en los planes de fomento de las energías renovables en España

    OpenAIRE

    Espejo Marín, Cayetano; García Marín, Ramón; Aparicio Guerrero, Ana Eulalia

    2016-01-01

    La energía minihidráulica incluye las centrales con una potencia instalada de hasta 10 megavatios. Esta tecnología de producción energética se ha incluido en los Planes de Fomento de las Energías Renovables promovidos por los Gobiernos de España desde finales de los años noventa a la actualidad. En esta aportación se analizan los objetivos de potencia a instalar en cada Comunidad Autónoma durante el periodo de vigencia de cada Plan, las barreras con las que se encuentra el sector para el desa...

  18. Conocimiento de Energía: Principios Esenciales y Conceptos Fundamentales para la Educación de Energía

    Energy Technology Data Exchange (ETDEWEB)

    None

    2014-06-01

    This is the Spanish version of our Energy Literacy guidebook. Esta guía presenta conceptos de energía que, cuando se entienden y se aplican, ayudan a individuos y a comunidades a tomar decisiones sobre la energía con conocimiento de causa. No es un currículo sino que ofrece un marco sobre el cual puede basarse un plan de estudios. La guía se dirige a cualquier persona que participe en la educación de energía.

  19. Wireless energizing system for an automated implantable sensor

    Energy Technology Data Exchange (ETDEWEB)

    Swain, Biswaranjan; Nayak, Praveen P.; Kar, Durga P.; Bhuyan, Satyanarayan; Mishra, Laxmi P. [Department of Electronics and Instrumentation Engineering, Siksha ‘O’ Anusandhan University, Bhubaneswar 751030 (India)

    2016-07-15

    The wireless drive of an automated implantable electronic sensor has been explored for health monitoring applications. The proposed system comprises of an automated biomedical sensing system which is energized through resonant inductive coupling. The implantable sensor unit is able to monitor the body temperature parameter and sends back the corresponding telemetry data wirelessly to the data recoding unit. It has been observed that the wireless power delivery system is capable of energizing the automated biomedical implantable electronic sensor placed over a distance of 3 cm from the power transmitter with an energy transfer efficiency of 26% at the operating resonant frequency of 562 kHz. This proposed method ensures real-time monitoring of different human body temperatures around the clock. The monitored temperature data have been compared with a calibrated temperature measurement system to ascertain the accuracy of the proposed system. The investigated technique can also be useful for monitoring other body parameters such as blood pressure, bladder pressure, and physiological signals of the patient in vivo using various implantable sensors.

  20. Wireless energizing system for an automated implantable sensor

    International Nuclear Information System (INIS)

    Swain, Biswaranjan; Nayak, Praveen P.; Kar, Durga P.; Bhuyan, Satyanarayan; Mishra, Laxmi P.

    2016-01-01

    The wireless drive of an automated implantable electronic sensor has been explored for health monitoring applications. The proposed system comprises of an automated biomedical sensing system which is energized through resonant inductive coupling. The implantable sensor unit is able to monitor the body temperature parameter and sends back the corresponding telemetry data wirelessly to the data recoding unit. It has been observed that the wireless power delivery system is capable of energizing the automated biomedical implantable electronic sensor placed over a distance of 3 cm from the power transmitter with an energy transfer efficiency of 26% at the operating resonant frequency of 562 kHz. This proposed method ensures real-time monitoring of different human body temperatures around the clock. The monitored temperature data have been compared with a calibrated temperature measurement system to ascertain the accuracy of the proposed system. The investigated technique can also be useful for monitoring other body parameters such as blood pressure, bladder pressure, and physiological signals of the patient in vivo using various implantable sensors.

  1. Wireless energizing system for an automated implantable sensor.

    Science.gov (United States)

    Swain, Biswaranjan; Nayak, Praveen P; Kar, Durga P; Bhuyan, Satyanarayan; Mishra, Laxmi P

    2016-07-01

    The wireless drive of an automated implantable electronic sensor has been explored for health monitoring applications. The proposed system comprises of an automated biomedical sensing system which is energized through resonant inductive coupling. The implantable sensor unit is able to monitor the body temperature parameter and sends back the corresponding telemetry data wirelessly to the data recoding unit. It has been observed that the wireless power delivery system is capable of energizing the automated biomedical implantable electronic sensor placed over a distance of 3 cm from the power transmitter with an energy transfer efficiency of 26% at the operating resonant frequency of 562 kHz. This proposed method ensures real-time monitoring of different human body temperatures around the clock. The monitored temperature data have been compared with a calibrated temperature measurement system to ascertain the accuracy of the proposed system. The investigated technique can also be useful for monitoring other body parameters such as blood pressure, bladder pressure, and physiological signals of the patient in vivo using various implantable sensors.

  2. Seguridad energética rusa: entre Europa y China

    Directory of Open Access Journals (Sweden)

    Antonio Sánchez

    2008-05-01

    Full Text Available Dentro de la seguridad energética rusa aparece como una debilidad importante la concentración de recursos en unos pocos clientes, en concreto en la UE. Por este motivo, las autoridades rusas están tratando de diversificar destinos de venta, tratando de abrir otros mercados, en especial en extremo oriente y, en particular en China. Esto acrecienta su seguridad energética, pero debilita la europea en caso de que la UE no adopte medidas activas. El abastecimiento a Europa desde Rusia, especialmente de gas, depende también de tres grandes limitaciones. En primer lugar, que existan nuevos yacimientos y su posibilidad de movilizarlos conforme aumenten las necesidades europeas. En segundo lugar, aparece el problema del surgimiento de competidores por el gas ruso y, en particular, recientemente se ha subrayado el papel de China como futuro cliente de gas ruso. En tercer lugar, se encuentra la posibilidad de que Rusia pueda ejercer un control especial sobre la oferta de gas mundial, que condicione en cantidad o/y precio el abastecimiento a Europa.

  3. Particle energization by inertial Alfven wave in auroral ionosphere

    Science.gov (United States)

    Kumar, S.

    2017-12-01

    The role of inertial Alfven wave in auroral acceleration region and in the inertial regime to energize the plasma particles is an interesting field and widely discussed observationally as well as theoretically in recent years. In this work, we present the density perturbations by inertial Alfvén wave (AW) in the auroral ionosphere. We obtain dynamical equations for inertial AW and fast mode of AW using two-fluid model and then solve them numerically in order to analyze the localized structures and cavity formation. The ponderomotive force due to the high frequency inertial AW changes the background density and is believed to be responsible for the wave localization or for the formation of density cavities in auroral ionosphere. These density cavities are believed to be the sites for particle energization. This perturbed density channel grow with time until the modulation instability acquires steady state. We find that the density cavities are accompanied by the high amplitude magnetic fields. The amplitude of the strongest density cavity is estimated as ˜ 0.26n0 (n0 is unperturbed plasma number density). The results presented here are found consistent with the observational studies using FAST spacecraft.

  4. Ahorre Energía: Consejos sobre el ahorro de dinero y energía en el hogar (Spanish Brochure), Energy Savers Guide

    Energy Technology Data Exchange (ETDEWEB)

    None

    2014-09-01

    La versión en castellano de la guía del Departamento de Energía de los Estados Unidos que ayuda a consumidores a ahorrar energía y dinero en el hogar y en las carreteras. The Spanish-language version of U.S. Department of Energy's consumer guide to saving energy and money at home and on the road.

  5. Ahorre Energía: Consejos para ahorro dinero y energía en su hogar (Spanish Brochure), Energy Saver Guide

    Energy Technology Data Exchange (ETDEWEB)

    None

    2017-11-01

    La versión en castellano de la guía del Departamento de Energía de los Estados Unidos que ayuda a consumidores a ahorrar energía y dinero en su hogar y en las carreteras. The Spanish-language version of U.S. Department of Energy's Energy Saver consumer guide to saving energy and money at home and on the road.

  6. El futuro energético de Japón

    Directory of Open Access Journals (Sweden)

    María Francisca Casado

    2016-05-01

    Full Text Available Tras el triple desastre del 11 de marzo de 2011, Japón se encuentra en una encrucijada energética. A corto y medio plazo depende de las importaciones de combustibles fósiles para garantizar su seguridad energética, pero el largo plazo está por decidir y lo determinarán las decisiones que tome en estos años. Como consta en su Estrategia de Seguridad Nacional, para Japón la seguridad energética es una cuestión de seguridad nacional. El artículo revisa la trayectoria nuclear nipona, estudia cuáles son los factores que configuran el mercado eléctrico japonés y analiza su actual situación energética. Por otra parte, también repasa los principios que han marcado su política energética, deteniéndose a evaluar los dos últimos Planes Estratégicos de Energía –uno anterior y otro posterior a Fukushima- antes de adentrarse en el debate sobre la composición óptima del futuro mix energético para cumplir con su trilema de la seguridad energética, marcado por su compromiso con el medio ambiente.

  7. Situación actual del sector energético en España

    Directory of Open Access Journals (Sweden)

    Carlos J. Pardo Abad

    2001-01-01

    Full Text Available La energía es un sector clave de la economía española y está presente en todos los procesos productivos. El artículo analiza al sector en los últimos años con datos procedentes de varios organismos públicos, referidos tanto al balance energético general como a los sectores energéticos, las energías renovables, la política energética y las relaciones entre energía y medio ambiente. Características básicas del sector en nuestro país son el incremento del consumo de energía, la progresiva liberalización y las grandes inversiones en energías renovables, sobre todo la eólica. Energy is a key sector of the Spanish economy and it is in all productivo processes.This article analyses the sector in the last fewyears with data from some public agencies, referred to the power balance as well as to nuclear power, coal, oil, natural gas, renewable energies, power policy and the relationship between energy and environment. The main eatures of energy in Spain are the increase of consumption, the growing liberation and the big investments in renewable energies, above all the eolic one.

  8. Testable, fault-tolerant power interface circuit for normally de-energized loads

    International Nuclear Information System (INIS)

    Hager, R.E.

    1987-01-01

    A power interface circuit is described for supplying power from a power line to a normally de-energized process control apparatus in a pressurized light water nuclear power system in dependence upon three input signals, comprising: voter means for supplying power to the normally de-energized load when at least two of the three input signals indicate that the normally de-energized load should be activated; a normally closed switch, operatively connected to the power line and the voter means, for supplying power to the voter means during ordinary operation; a first resistor operatively connected to the power line; a current detector operatively connected to the first resistor and the voter means; a second resistor operatively connected to the current detector and ground; and current sensor means, operatively connected between the voter means and the normally de-energized load, for detecting the power supplied to the normally de-energized load by the voter means

  9. The origin of small and large molecule behavior in the vibrational relaxation of highly excited molecules

    International Nuclear Information System (INIS)

    Gordon, R.J.

    1990-01-01

    An explanation is proposed for the qualitatively different types of behavior that have been reported for the vibrational relaxation of highly excited diatomic and polyatomic molecules. It is argued that all of the diatomic molecules that have been studied in bulk relax adiabatically at room temperature. In contrast, large polyatomic molecules have low frequency modes which act at ''doorway'' modes for the rest of the molecules, producing an impulsive relaxation mechanism. The theoretical work of Nesbitt and Hynes showed that impulsive collisions result in an exponential decay of the average vibrational energy of a Morse oscillator, whereas adiabatic collisions produce nonexponential power law behavior. We propose that this result explains a large body of data for the vibrational relaxation of small and large molecules

  10. Por uma nova ordem energética global? potencialidades e perspectivas da questão energética entre os países BRICS

    Directory of Open Access Journals (Sweden)

    José María Gómez

    2012-12-01

    Full Text Available O presente artigo propõe analisar a questão energética entre os BRICS e o potencial de rearticulação da ordem energética global que dela emerge. Para tal, realiza três movimentos. Em primeiro lugar, investiga o crescente impacto agregado dos países BRICS no cenário energético global, com vistas a analisar seu avanço em uma temática até então reduto dos países desenvolvidos. Em segundo lugar, aborda a matriz energética de cada um dos cinco países do ponto de vista de suas economias políticas e da questão da sustentabilidade. Em terceiro lugar, e com base na seção anterior, propõe mapear as áreas de conflito e de possível aproximação entre os BRICS, na tentativa de localizar as possibilidades e limites da sua cooperação energética. Com base nessa investigação, conclui que, diante das potencialidades para a cooperação entre os países, a organização de suas ofertas e demandas energéticas nacionais pode permitir ao agrupamento articular-se como um novo polo no cenário energético global.

  11. Aplicación electrónica para el ahorro de energía eléctrica utilizando una energía alternativa

    Directory of Open Access Journals (Sweden)

    Juan Carlos Cruz-Ardila

    2013-01-01

    Full Text Available El artículo presenta un trabajo orientado a disminuir el consumo de energía eléctrica entregada por la red eléctrica convencional, a través del aprovechamiento de la energía solar fotovoltaica. Se propone el diseño de un sistema de transferencia electrónica que facilita el uso de la energía eléctrica DC proveniente del panel solar, suprimiendo de esta manera, la utilización del inversor de voltaje, comúnmente usado en este tipo de aplicaciones y que eleva el costo de utilización de la energía solar. Se da a conocer inicialmente una revisión del estado del arte, que permite contextualizar el problema resuelto a partir de una energía renovable como la fotovoltaica, destacándose que actualmente España es el país con mayor desarrollo en este tema. Luego, se muestra el desarrollo secuencial del sistema de alimentación y la transferencia electrónica, haciendo una descripción de las variables identificadas y explicación, con el uso de diagramas de flujo, del sistema embebido implementado. También se da una descripción de los dispositivos usados tal como el sensor de corriente, la regulación y la rectificación. Se muestra el esquemático de la transferencia implementada. Finalmente, se revelan los resultados y las pruebas operacionales realizadas al sistema para demostrar la funcionalidad de la aplicación electrónica en el ahorro de la energía eléctrica utilizando una energía alternativa.

  12. Producción, Reservas y Sostenibilidad de la Energía en Venezuela

    Directory of Open Access Journals (Sweden)

    Juan Carlos Rojas-Zerpa

    2015-06-01

    Full Text Available El propósito del presente trabajo está relacionado con la evaluación de los recursos energéticos de Venezuela y su posicionamiento estratégico mundial, referido principalmente a la producción y consumo de energía primaria y reservas. Así mismo se han evaluado los recursos energéticos renovables con la finalidad de identificar oportunidades para el desarrollo de la energía sostenible. Los resultados indican que Venezuela posee recursos fósiles para más de 130 años de explotación, lo cual lo convierte en una potencia energética relevante en el contexto mundial. La potencialidad aprovechable de las energías renovables duplicó la producción de recursos fósiles en 2011. En la actualidad, el aprovechamiento de estas fuentes es inferior al 2 % del total disponible, lo que deja abierto un amplio rango de posibilidades para la diversificación de la matriz energética nacional mediante tecnologías limpias o sostenibles

  13. On the calculation of internal forces in mechanically stressed polyatomic molecules

    International Nuclear Information System (INIS)

    Avdoshenko, Stanislav M.; Konda, Sai Sriharsha M.; Makarov, Dmitrii E.

    2014-01-01

    We discuss how to define and to compute internal forces in a molecule subjected to mechanical stress. Because of the inherently many-body character of intramolecular interactions, internal forces cannot be uniquely defined without specifying a set of internal coordinates used to describe the molecular structure. When such a set is comprised of 3N − 6 interactomic distances (N being the number of atoms) and includes the bond lengths of interest, we show that the associated forces, while satisfying the equation F = ∂V/∂R (where R is the bond length, F is the internal force in this bond, and V is the potential energy of the molecule), can be determined from the molecular geometry alone. We illustrate these ideas using several toy models ranging from small molecules to a graphene sheet and show that the magnitude of the internal force in a bond is not necessarily a good predictor of its strength in response to mechanical loading. At the same time, analysis of internal forces reveals interesting phenomena such as the force multiplication effect, where weak external forces may, e.g., be used to break strong bonds, and offers insight into the catch-bond phenomenon where chemical reactivity is suppressed through application of a force

  14. La inversión en energías renovables en Argentina

    OpenAIRE

    Recalde, Marina

    2017-01-01

    En este artículo se analiza en qué medida los factores del entorno de la política energética de un país en desarrollo, tal como Argentina, determinan la evolución de la inversión en energías renovables. La baja calidad institucional del país ayuda a crear condiciones no propicias que contrarrestan el efecto de la política energética, reduciendo los incentivos para invertir en tecnologías renovables. Es necesario entonces mejorar las condiciones institucionales de los países en desarrollo para...

  15. Estudio del balance energético en velocistas de alto rendimiento

    OpenAIRE

    Lorente Gutiérrez, Jesús

    2015-01-01

    El objetivo de este estudio fue evaluar el balance energético en tres atletas de alto rendimiento durante 28 días, que coincidieron con el periodo competitivo de pista cubierta. La ingesta energética fue estudiada a partir de registros alimentarios durante los 28 días. Del mismo modo, el gasto energético fue estimado por tres métodos, mediante registros de actividad durante 28 días, mediante el estudio del ritmo metabólico basal estudiado por calorimetría indirecta, aplicándole el fa...

  16. Perspectivas de la situación energética mundial. Las oportunidades para Colombia

    OpenAIRE

    Arturo Infante Villarreal

    2007-01-01

    Casi la cuarta parte de la energía que consume Estados Unidos proviene de petróleo importado y sólo el 6% se origina en fuentes renovables, aunque el país produce 20% de la polución ambiental mundial y tiene sólo 4% de la población total. Los biocombustibles son una fuente potencial de energía renovable para Estados Unidos, y el resto del mundo, porque tienen un balance energético y ambiental bastante favorable. Si las condiciones de precios son adecuadas para los productores de las materias ...

  17. Eficiencia energética en el sector residencial de la ciudad de Cuenca, Ecuador

    OpenAIRE

    Baquero Larriva, María Teresa; Quesada Molina, Juan Felipe

    2016-01-01

    El objetivo de la presente investigación fue determinar en qué medida se puede reducir el consumo de energía en el sector residencial de la ciudad de Cuenca, manteniendo óptimas condiciones de confort. El estudio se centra en la definición de indicadores de eficiencia energética para la vivienda, mediante la determinación de la demanda de energía y la definición de los factores de mayor consumo, usando un enfoque cualitativo y cuantitativo. Se realizaron encuestas en 280 viviendas del sector ...

  18. Asturias en el sistema energético: del nacionalismo a la globalización

    OpenAIRE

    Maurín Álvarez, Manuel

    2011-01-01

    Con una demanda energética regional estancada y al mismo tiempo en que se clausuran las últimas explotaciones mineras, principales proveedoras de materias primas energéticas autóctonas, Asturias se aventura a la construcción de infraestructuras de generación y transporte que permitirían duplicar en los próximos años una producción eléctrica que ya es excedentaria. La región se convierte así en una especie de «vientre de alquiler» energético, especializada en generar, con materias primas impor...

  19. Balance de energía en cultivos hortícolas a campo en Rosario (Santa Fe, Argentina

    Directory of Open Access Journals (Sweden)

    J. Denoia

    2010-01-01

    Full Text Available Se analizó la gestión de la energía en cultivos de papa, tomate y lechuga en un área próxima a la ciudad de Rosario (Argentina. Se consideraron todos los ingresos de materia al sistema y su producción transformándolos en energía al multiplicar las cantidades de insumos por sus contenidos energéticos. Se analizó tanto la energía directa como la indirecta. Se estudió la gestión energética dentro de los límites físicos del sistema. Los indicadores empleados fueron: eficiencia energética (EfE y productividad energética (PE. Los balances energéticos de papa y tomate fueron negativos, mientras que en lechuga, la energía producida fue menor que la ingresada. La mayor eficiencia energética se registró en tomate (3,54, seguida por papa (2,69; la menor fue en lechuga (0,25. La energía ingresada en tomate resultó la más eficiente (88,6 kgMS/100 Mj, seguida por la de papa (16 kgMS/100 Mj y la de lechuga (10,8 kgMS/100 Mj.

  20. Kinetic Simulations of Plasma Energization and Particle Acceleration in Interacting Magnetic Flux Ropes

    Science.gov (United States)

    Du, S.; Guo, F.; Zank, G. P.; Li, X.; Stanier, A.

    2017-12-01

    The interaction between magnetic flux ropes has been suggested as a process that leads to efficient plasma energization and particle acceleration (e.g., Drake et al. 2013; Zank et al. 2014). However, the underlying plasma dynamics and acceleration mechanisms are subject to examination of numerical simulations. As a first step of this effort, we carry out 2D fully kinetic simulations using the VPIC code to study the plasma energization and particle acceleration during coalescence of two magnetic flux ropes. Our analysis shows that the reconnection electric field and compression effect are important in plasma energization. The results may help understand the energization process associated with magnetic flux ropes frequently observed in the solar wind near the heliospheric current sheet.

  1. Situación energética de los hidrocarburos en el Perú

    OpenAIRE

    Rojas Lazo, Oswaldo; Rojas Rojas, Jorge; Salas Bacalla, Julio

    2014-01-01

    La tasa de crecimiento anual del consumo de energía en el mundo se incrementa a razón de 2 a 3%, teniendo a los hidrocarburos y el carbón como sus principales componentes. En el Perú las reservas probadas de energía son: gas (Camisea) con el 43% de la energía comercial, la hidroenergía 23,1%, los líquidos de gas natural con el 14,7% y otros con el 19.2%. La balanza comercial energética en el Perú es negativa, la producción de petróleo en los últimos años está descendiendo mientras que la prod...

  2. Development and energization of IOT based RF amplifier

    International Nuclear Information System (INIS)

    Mandal, A.; Som, S.; Raj, P.R.; Manna, S.K.; Ghosh, S.; Seth, S.; Thakurta, S.; Thakur, S.K.; Saha, S.; Panda, U.S.

    2013-01-01

    A 704 MHz IOT based CW RF amplifier has been developed in VECC. It can also be used with proper tuning to power cavity modules operating at 650 MHz in high energy high intensity proton linear accelerator proposed to be built for ADSS/SNS programme in India and Project-X at Fermilab, USA. This IOT based amplifier provides up to 60 kW continuous wave RF power at 700 MHz. It required various power supplies, LCW cooling and forced air cooling for its operation. The auxiliary power supplies like Grid, Filament and Ion-pump, are floated and mounted on an isolated frame, i.e., HV deck. The mains inputs are electrically isolated by means of isolation transformer. Also, a Programmable Logic Controller (PLC) based interlocks along with high voltage collector power supply has been designed and developed for the safe operation of the RF amplifier. This paper discusses about various developments and energization of the IOT based RF amplifier with high power dummy load. (author)

  3. Re-energizing enquiry among our young professionals

    Science.gov (United States)

    Roychoudhuri, ChandraSekhar

    2017-08-01

    Children are born with enquiring mindset. They keep on asking questions to explore, understand and take part in their environment. However, modern educational systems discourage persistent enquiring questions. Most students, graduating from college, can use their enquiring faculties only to solve problems at hand. They accept the theories taught as the final models for the laws of nature. They safely assume that no further deeper enquiry is needed. This is a disturbing collective tendency counter to our continuously evolving nature. We should also consciously train our minds to evolve continuously by persistently asking enquiring questions. Therefore, we suggest that we take pro-active steps to re-energize the enquiring mindset among our young professionals by organizing enquiry forums for students from all international Student Chapters during most of our optical society meetings. Panels of volunteer senior scientists should encourage deep enquiring questions from the students. In this paper, as examples, I will present a set of enquiring questions in the field of optics that we have been underscoring to students. This is one of the three papers by this author for this conference, ETOP 100-43. Since scientific content-wise they complement each other, the readers should consult the others. They are: ETP100-36, "Consequences of repeated discovery and benign neglect of non-interaction of waves" and ETP100-83, and "Demonstration and implications when 50% beam combiners can behave as 0 or 100% reflector/transmitter inside some interferometers."

  4. Dissinfection of municipal sludge and wastewater by energized electrons

    International Nuclear Information System (INIS)

    Trump, J.G.; Wright, K.A.; Sinskey, A.J.; Shah, D.N.; Fernald, R.

    1979-01-01

    Laboratory studies at M.I.T. and high flow rate studies at the M.D.C. Deer Island Wastewater Treatment Plant in Boston have shown the practicality and cost effectiveness of disinfecting liquid municipal sludges by injecting energized electrons. A dosage of 400 Kilorads (4 Kilograys) reduces gram-negative bacteria, including coliforms, fecal coliforms, salmonellae and shigellae, in primary raw or anaerobically digested sludges to undetectable levels. Enteric viruses are reduced by one to two orders of magnitude. This treatment also destroys parasite eggs or renders them non-infectious. Model system studies indicate that trace toxic compounds such as PCBs in water are degraded. The estimated cost of sludge disinfection by electron treatment is about $0.80 per liquid tonne for modular systems of 650 liquid tonnes per day capacity. About 6 Kilowatt-hours of input electric power per tonne is required. The temperature rise of the disinfected watery sludge is about 2 0 C. Electron disinfection combined with subsurface soil injection offers an environmentally attractive, energy-efficient, and economic two -step process for land disposal of municipal sludges with water conservation and soil improvement benefits. Combined with widely-distributed ocean feeding, electron disinfection of the municipal sludge of coastal communities offers a safe marine nutrient for increasing fish population in treated ocean areas. The electron disinfection of effluent wastewater, in lieu of chlorination, is a future application which avoids the production of potentially toxic chlorinated hydrocarbons. (Author) [pt

  5. Calcium transport in vesicles energized by cytochrome oxidase

    Energy Technology Data Exchange (ETDEWEB)

    Rosier, Randy N. [Univ. of Rochester, NY (United States)

    1979-01-01

    Experiments on the reconstitution of cytochrome oxidase into phospholipid vesicles were carried out using techniques of selectivity energizing the suspensions with ascorbate and cytochrome c or ascorbate, PMS, and internally trapped cytochrome c. It was found that the K+ selective ionophore valinomycin stimulated the rate of respiration of cytochrome oxidase vesicles regardless of the direction of the K+ flux across the vesicle membranes. The stimulation occurred in the presence of protonophoric uncouplers and in the complete absence of potassium or in detergent-lysed suspensions. Gramicidin had similar effects and it was determined that the ionophores acted by specific interaction with cytochrome oxidase rather than by the previously assumed collapse of membrane potentials. When hydrophobic proteins and appropriate coupling factors were incorporated into the cytochrome oxidase, vesicles phosphorylation of ADP could be coupled to the oxidation reaction of cytochrome oxidase. Relatively low P:O, representing poor coupling of the system, were problematical and precluded measurements of protonmotive force. However the system was used to study ion translocation.

  6. Pathways for Energization of Ca in Mercury's Exosphere

    Science.gov (United States)

    Killen, Rosemary M.

    2015-01-01

    We investigate the possible pathways to produce the extreme energy observed in the calcium exosphere of Mercury. Any mechanism must explain the facts that Ca in Mercury's exosphere is extremely hot, that it is seen almost exclusively on the dawnside of the planet, and that its content varies seasonally, not sporadically. Simple diatomic molecules or their clusters are considered, focusing on calcium oxides while acknowledging that Ca sulfides may also be the precursor molecules. We first discuss impact vaporization to justify the assumption that CaO and Ca-oxide clusters are expected from impacts on Mercury. Then we discuss processes by which the atomic Ca is energized to a 70,000 K gas. The processes considered are (1) electron-impact dissociation of CaO molecules, (2) spontaneous dissociation of Ca-bearing molecules following impact vaporization, (3) shock-induced dissociative ionization, (4) photodissociation and (5) sputtering. We conclude that electron-impact dissociation cannot produce the required abundance of Ca, and sputtering cannot reproduce the observed spatial and temporal variation that is measured. Spontaneous dissociation is unlikely to result in the high energy that is seen. Of the two remaining processes, shock induced dissociative ionization produces the required energy and comes close to producing the required abundance, but rates are highly dependent on the incoming velocity distribution of the impactors. Photodissociation probably can produce the required abundance of Ca, but simulations show that photodissociation cannot reproduce the observed spatial distribution.

  7. Cálculo del balance de energía para higuerilla (Ricinus communis L. desde las etapas de producción en campo hasta el valor energético de cada componente de la planta

    Directory of Open Access Journals (Sweden)

    Hipólito Ortíz-Laurel

    2017-01-01

    Full Text Available Introducción : Pruebas de balance de energía permiten redirigir los insumos desde las etapas de producción de un cultivo, e igualmente, precesar la cantidad de energía utilizada para cada proceso y así, verificar la eficiencia al transformar la energía contenida en el cultivo cuando debe cumplir con una función deseada. Método : la planta de higuerilla (Ricinus communis L. con propósitos de cultivo energético fue sembrada en campo y sometida a procesos de mantenimiento de l cultivo y en la cosecha, la planta completa fue colectada para análisis energético, donde cada una de sus partes inclu i das las semillas fueron evaluadas en función de su contenido de energía. Así, para determinar el balance de energía; los valores de la energía biológica de la planta fueron comparados con la energía aplicada en cada uno de los procesos técnicos y físicos para la producción del cult i vo y en su procesamiento . Resultados : La energía aplicada para producir el cultivo r esulta un 28% superior a la energía a obtener de la planta. Asimismo, la biomasa de la planta completa de higuerilla, sin contar las semillas genera el doble de energía comparado con el aceite de las semillas, por lo que, conviene utilizar toda la planta e n términos de energía . Conclusión : Es recomendable utilizar el aceite de las seillas como biomaterial, ya que el b a lance es positivo en un 15%.

  8. Contribution to the understanding of ion-gas reactions in ICP-MS collision reaction cells: application to the resolution of isobaric and polyatomic interferences

    International Nuclear Information System (INIS)

    Quemet, A.

    2012-01-01

    Inductively Coupled Plasma Mass Spectrometry (ICP-MS) emerged as the most essential technique in inorganic analytical chemistry thanks to its numerous assets, particularly its flexibility, its sensitivity and its reproducibility. As part of the elementary and isotopic analysis of irradiated fuel and transmutation target, the analyst is faced with a complex mass spectrum, due to the presence of many radionuclides. ICP-MS can not differentiate ions with the same mass, which induces isobaric and polyatomic interferences when the ions at the same mass are different chemical species. Last generations of ICP-MS have introduced collision reaction cells. It can in situ reduce these isobaric or polyatomic interferences. The cell is a multipole (quadrupole, hexapole or octupole) device filled with a collision and/or reaction gas. The gas molecules collide or possibly react with the ion beam, which eliminates or reduces interferences. Such resolution of interferences is based on the difference of chemical behaviours between the analyte and the interfering species: the choice of the gas is crucial. A better understanding of the 'ion - gas' reaction should help choosing the reacting gases. Three ICP-MS, with the different cell geometries, were used for this study: Perkin Elmer Elan DRC e (quadrupole), Thermo Fischer X serie II (hexapole) and Agilent Technologies 7700x (octupole). The effects of the cell geometry on different experimental parameters and on the resolution of the 56 Fe + / 40 Ar 16 O + polyatomic interferences were examined to measure iron at trace or ultra-trace level. This preliminary study was applied to measure iron as impurities in uranium oxide, the method was then validated with a Certified Reference Material. The reactivities of transition metals (Zr, Ru, Pd, Ag, Cd, Sn), lanthanides (La, Ce, Nd, Sm, Eu, Gd, Dy, Er and Yb) and actinides (U, Np, Pu, Am and Cm), elements of interest in the nuclear field, are studied with numerous gases (O 2 , CO, CO 2 , N 2

  9. Apparatus for deploying and energizing submersible electric motor downhole

    International Nuclear Information System (INIS)

    Conner, S.E.; Dwiggins, J.L.; Brookbank, E.B.

    1991-01-01

    This patent describes an apparatus for deploying and energizing a submergible electric motor downhole. It comprises a cable socket assembly and a cable connecting-and-sealing chamber assembly adapted to be arranged seriatim in the path of cable means and the motor, the assemblies having first and second housings, respectively, means for connecting a lower end of the first housing to an upper end of the second housing, a lower end of the second housing being adapted for connection to the motor, the cable socket assembly having an attachment portion including means for attaching a weight-bearing cable of the cable means to the first housing via a breakaway connection, the first housing having a passage therein adapted to pass an electrical cable of the cable means to the second housing, the second housing being divided by a body therein into first and second chambers sealed from each other, the first chamber being adapted to communicate sealingly with the passage and the second chamber being adapted to communicate sealingly with the interior of the motor, a first set of electrical conductors in the first chamber and a second set of electrical conductors in the second chamber, the body having feed-through means for electrically interconnecting conductors of the first set with corresponding conductors of the second set, the conductors of the first set having electrical connector parts adapted to connect releasably with corresponding electrical connector parts of the electrical cable, and the conductors of the second set having electrical connector parts adapted to connect with corresponding electrical connector parts of the motor, each of the chambers being adapted to be filled with fluid to exclude well fluid therefrom

  10. Cross sections and oscillator strengths for electron-impact excitation of electronic states in polyatomic molecules. Application examples of the BEf- scaling model in optically-allowed transitions

    International Nuclear Information System (INIS)

    Kato, H.; Kawahara, H.; Hoshino, M.

    2009-12-01

    Integral cross sections for optically allowed electronic-state excitations by electron impact, are reviewed for polyatomic molecules by applying the Binary-Encounter-Bethe (BEB) scaling model. Following the context of the present review, the scaling model originally proposed by Yong-Ki Kim to determine electron-impact cross sections for ionization of atoms and molecules is also summarized briefly for its wide range of applications [Electron-Impact Cross Section Database, NIST, Y.-K. Kim]. The present report not only focuses on the need for the cross-section data, but also elucidates the verification of the scaling model in the general application for atoms and molecules. Since this report is for a data base, it is summarized for data base users by citing (copying) the descriptions in the original papers and the references within those papers in the style of a textbook. (author)

  11. La Seguridad Energética y la Estrategia Global de Seguridad de la Unión Europea

    Directory of Open Access Journals (Sweden)

    Ruben Herrero

    2016-10-01

    Full Text Available El presente artículo plantea una definición ampliada del concepto de seguridad energética, yendo más allá del concepto clásico establecido por la Agencia Internacional de la Energía, incorporando cuestiones relativas a la eficiencia energética, la aceptabilidad del modelo energético y los retos que impone el cambio climático, pero sin perder de perspectiva las exigencias y las dinámicas competitivas económicas globales. Sobre la base de este concepto ampliado, se examina la evolución de la seguridad energética en el marco de la Unión Europea, con una atención particular a cómo se concibe la seguridad energética en la Estrategia Global de Seguridad de 2016.

  12. Costo energético de muros y techos utilizados en la zona sur de Tamaulipas

    Directory of Open Access Journals (Sweden)

    Mireya Alicia Rosas Lusett

    2015-01-01

    Full Text Available El presente trabajo muestra los procedimientos y resultados obtenidos del análisis de la energía trasmitida en techos y muros de las viviendas seleccionadas de la zona sur del estado de Tamaulipas, una de las cinco áreas establecidas dentro del proyecto “Desarrollo y validación de una metodología para estimar los impactos en el ahorro de energía por el uso de sistemas pasivo-constructivos en la edificación para diferentes climas de México”. Este proyecto fue financiado por la Convocatoria S0019-2009-01 del Fondo Sectorial de Sustentabilidad Energética SENER-CONACYT con registro Nº 118665, cuyo objetivo en su tercera etapa de ejecución, consistió en hacer uso de la herramienta Ener-Habitat, la cual fue desarrollada durante la segunda fase del proyecto. Con dicho programa de cálculo se determinaron los gastos de energía, comparativa de cuatro sistemas constructivos para muros y tres sistemas constructivos para losas utilizadas en la zona sur de Tamaulipas. Con la información obtenida y mediante el uso de la metodología desarrollada para estimar los impactos en el ahorro de energía, se evaluó el costo energético de cada uno de los sistemas constructivos. Con los resultados obtenidos se pudo determinar cuál era el muro y techo de menor gasto de energía para la zona de estudio. Adicionalmente se realizó un estudio de la influencia de la absortancia solar de la superficie exterior de los muros, cuyos resultados darán la pauta para diseñar una vivienda que pretende sea adecuada y cómoda al clima cálido húmedo que prevalece en el área.

  13. Extracción de energía del agua mediante generadores piezoeléctricos

    OpenAIRE

    Rodríguez Mendoza, Iker

    2014-01-01

    El desarrollo del Proyecto consiste, por una parte, en el estudio sobre la respuesta de los materiales piezoeléctricos como generadores de energía en un entorno acuoso que está sometido a variaciones de potencial y, por otra, en el estudio técnico y económico de un equipo basado en la utilización esta fuente de energía y su comercialización en el mercado energético. Esta energía es la que se obtiene de la fuerza de arrastre del agua al desplazarse a causa del movimiento ondulatorio de las ol...

  14. Costo energético de las labores de preparación de suelo en Cuba

    OpenAIRE

    Pedro Paneque Rondón; Dailyn Soto León

    2007-01-01

    El objetivo fundamental del trabajo fue determinar el costo energético de las operaciones agrícolas mecanizadas y comparar los costos energéticos de los distintos tamaños (anchos de trabajo) de los aperos más utilizados en el país para la preparación de suelo, testando la hipótesis de que el costo energético expresado en MJ/ha es independiente del tamaño del equipo. Los resultados de la investigación permitieron llegar a las siguientes conclusiones: los mayores costos energéticos cor...

  15. Vulnerabilidad energética en la metrópoli de Buenos Aires

    Directory of Open Access Journals (Sweden)

    Silvina Carrizo

    2014-06-01

    Full Text Available Argentina declaró el uso racional y la eficacia energética una prioridad nacional, en consonancia con las recomendaciones de la Agencia Internacional de la Energía. Buenos Aires se ha comprometido con varios programas internacionales de preparación al cambio climático. Así a distintas escalas surgen iniciativas para modificar las condiciones y modalidades de aprovisionamiento y consumo energéticos, que revelan la precariedad y vulnerabilidad del sistema y los servicios. Este trabajo presenta una reflexión sobre los cambios que se dan en ese sentido, mostrando los inconvenientes del modelo energético argentino en Buenos Aires y las estrategias o medidas que tienden a revertirlos y a preparar la ciudad para situaciones críticas. En general, se trata de iniciativas que se implementan individual o parcialmente, sin que haya un plan integral promovido a escala colectiva. Las correcciones resultan marginales en el conjunto sin aliviar los problemas que se agravan por el crecimiento vertiginoso de las demandas. Entonces la continuidad del modelo energético argentino basado en hidrocarburos, para abastecer infraestructura que trabaja al límite de su capacidad y servir territorios que no se han preparado para las posibles crisis, explicaría la vulnerabilidad del sistema de abastecimiento metropolitano.

  16. Perspectivas del potencial energético de la biomasa en el marco global y latinoamericano

    Directory of Open Access Journals (Sweden)

    Julián Rodrigo Quintero González

    2015-06-01

    Full Text Available El calentamiento global y los cambios climáticos que éste conlleva han fomentado desde hace algunos años la exploración de otros tipos de obtención energética para disminuir el uso del combustible fósil, siendo éste último uno de los principales causantes de dicho problema ambiental. El presente artículo expone algunas investigaciones recientes sobre la bioenergía u obtención de energía a partir de biomasa, considerada como energía limpia. Se abarcan temáticas como la bioenergía y sus posibilidades desde el punto de vista energético, teniendo en cuenta las expectativas de producción según su potencial o productividad energética, además del aporte que este tipo de tecnología hace a la disminución de la huella ecológica.

  17. The Roles of Fluid Compression and Shear in Electron Energization during Magnetic Reconnection

    Science.gov (United States)

    Li, Xiaocan; Guo, Fan; Li, Hui; Birn, Joachim

    2018-03-01

    Particle acceleration in space and astrophysical reconnection sites is an important unsolved problem in studies of magnetic reconnection. Earlier kinetic simulations have identified several acceleration mechanisms that are associated with particle drift motions. Here, we show that, for sufficiently large systems, the energization processes due to particle drift motions can be described as fluid compression and shear, and that the shear energization is proportional to the pressure anisotropy of energetic particles. By analyzing results from fully kinetic simulations, we show that the compression energization dominates the acceleration of high-energy particles in reconnection with a weak guide field, and the compression and shear effects are comparable when the guide field is 50% of the reconnecting component. Spatial distributions of those energization effects reveal that reconnection exhausts, contracting islands, and island-merging regions are the three most important regions for compression and shear acceleration. This study connects particle energization by particle guiding-center drift motions with that due to background fluid motions, as in the energetic particle transport theory. It provides foundations for building particle transport models for large-scale reconnection acceleration such as those in solar flares.

  18. C60 fullereno modificado por haces de iones de baja energía para prevenir el efecto multipactor

    Directory of Open Access Journals (Sweden)

    Galán, L.

    2005-04-01

    Full Text Available C60 fullerene modified by low-energy ion beams of H2 +, N2 +, O2 + y Ar+ has been studied. After ion bombardment, the photoemission spectra obtained using synchrotron radiation show an increase of the density of states just bellow the Fermi level. Ion bombarment of C60 with 50 eV energy and 4×1014 ion/cm2 fluence is sufficient to modify the cage structure of the fullerene and to obtain graphitic amorphous carbon. Upon bombarding with an energy of 50 eV, implantation of the nitrogen and the oxygen ions was observed, while implantation of the hydrogen and argon ions was small. The maximum secondary emission yield of C60 thin films is lower than 1.3 even after air exposure. A significant improvement on the secondary emission properties can be obtained after bombardment by low-energy Ar+ and N2 + ion beams.Se ha estudiado la interacción de los iones H2 +, N2 +, O2 + y Ar+ de baja energía con películas delgadas de fullereno C60. Después del bombardeo iónico, la densidad de estados cerca del nivel de Fermi aumenta de forma apreciable, según se observa en los espectros de fotoemisión obtenidos usando radiación sincrotrón. El bombardeo iónico con una energía de tan sólo 50 eV y una fluencia de 4x1014 ion/cm2 es suficiente para modificar la simétrica estructura de caja del fullereno y obtener carbono amorfo grafítico. El nitrógeno y el oxígeno se implantan al bombardear con una energía de 50 eV, mientras que la implantación es despreciable en el caso del hidrógeno y argon. Las películas de fullereno poseen un coeficiente máximo de emisión secundaria inferior a 1.3 incluso después de su exposición al aire, el cual disminuye después del bombardeo con iones de N2 + y Ar+.

  19. Propuesta de la certificación energética, mediante simulación dinámica, como herramienta de gestión energética ISO 50001 Versus auditoria energética en edificios.

    OpenAIRE

    Rey Hernández, Javier María; Rey Hernández, Alberto; Velasco, Eloy; San José, Julio; Rey Martinez, Francisco Javier

    2017-01-01

    Producción Científica El objetivo es el estudio de la gestión energética ISO 50001, mediante las herramientas de sistema de gestión tales como la auditoría energética y compararlo con la certificación energética mediante simulación dinámica, aplicadas a un edificio universitario estándar. La metodología empleada para alcanzar unos resultados de ahorro y eficiencia energética, aplicados a un edificio universitario, pretenden servir de modelo para poder extrapolarlos a edificios que compo...

  20. El hidrógeno y la energía

    OpenAIRE

    Aurelio Mendoza Medellín

    2006-01-01

    El hidrógeno es el elemento más simple, pero es fundamental para la vida. En el futuro sustituirá a los combustibles fósiles como fuente de energía para las máquinas hechas por el hombre. Hoy en día su uso es muy caro, pero ya existen motores que trabajan quemando este gas. En el sol la fusión de hidrógeno libera cantidades inconmensurables de energía, que en parte es captada por los cloroplastos, que la transforman en la energía química contenida en los carbohidratos resultantes de la fotosí...

  1. El hidrógeno y la energía

    OpenAIRE

    Aurelio Mendoza Medellín

    2006-01-01

    El hidrógeno es el elemento más simple, pero es fundamental para la vida. En el futuro sustituirá a los combustibles fósiles como fuente de energía para las máquinas hechas por el hombre. Hoy en día su uso es muy caro, pero ya existen motores que trabajan quemando este gas. En el sol la fusión de hidrógeno libera cantidades inconmensurables de energía, que en parte es captada por los cloroplastos, que la transforman en la energía química contenida en los carbohidratos resultantes ...

  2. Los balances energéticos en la producción agropecuaria.

    OpenAIRE

    Yepes Jaramillo, Guillermo; Martínez Bustamante, Enrique

    2011-01-01

    A través de este ensayo se presenta otro enfoque de análisis de la energía utilizada por los vegetales para la producción agraria. Se parte de los conceptos fundamentales relacionados con la termodinámica y la manera como el flujo de energía incide sobre el follaje de la vegetación y se distribuye, a través de las hojas, en todo el dosel de comunidades de plantas. La vida en la tierra es mantenida por el flujo de energía radiado por el sol y que entra en la biosfera. Por medio de la fotosínte...

  3. Eficiencia energética de los edificios: repercusión medioambiental

    Directory of Open Access Journals (Sweden)

    Maria Nieves Pacheco Jiménez

    2009-06-01

    Full Text Available Los recientes Planes, Estrategias y normas atinentes al fomento de la eficiencia energética en los edificios1 nacen en un contexto de preocupación por el cambio climático y sus consecuencias. Todos ellos persiguen la reducción de costes energéticos y la promoción de la sostenibilidad económica, política y ambiental. Un reflejo de esta inquietud por el bajo impacto ambiental puede observarse en el sector de la vivienda, cuyo consumo final de energía es muy elevado, y en la consiguiente intención de construir edificios bioclimáticos que aprovechen la energía del entorno. En aras a la consecución de estos objetivos, el Plan de Acción 2008-2012 impulsa una serie de medidas que recaen sobre el sector transporte, la industria, el sector residencial y el sector terciario, articulándose en torno a cuatro líneas de actuación: transversal, de movilidad, de edificios y de ahorro eléctrico. Este estudio aborda las pautas de ahorro y eficiencia energética propuestas para los edificios, tanto existentes como de nueva construcción, así como residenciales y del sector terciario. Para ello se hace imprescindible la remisión al concepto de “calidad” de los edificios, contemplado en la propia Exposición de Motivos de la Ley 38/1999, de Ordenación de la Edificación, y ligado estrechamente a la eficiencia energética de aquéllos.

  4. High resolution studies of the origins of polyatomic ions in inductively coupled plasma-mass spectrometry, Part I. Identification methods and effects of neutral gas density assumptions, extraction voltage, and cone material

    International Nuclear Information System (INIS)

    Ferguson, Jill Wisnewski; Houk, R.S.

    2006-01-01

    Common polyatomic ions (ArO + , NO + , H 2 O + , H 3 O + , Ar 2 + , ArN + , OH + , ArH + , O 2 + ) in inductively coupled plasma-mass spectrometry (ICP-MS) are identified using high mass resolution and studied using kinetic gas temperatures (T gas ) determined from a dissociation reaction approach. Methods for making accurate mass measurements, confirming ion identifications, and correcting for mass bias are discussed. The effects of sampler and skimmer cone composition and extraction voltage on polyatomic ion formation are also explored. Neutral species densities at several locations in the extraction interface are estimated and the corresponding effects of the T gas value are calculated. The results provide information about the origins of background ions and indicate possible locations for their formation or removal

  5. Climatización de una vivienda con energía geotérmica

    OpenAIRE

    González Elosua, Ignacio Isaías

    2013-01-01

    El presente proyecto consiste en el estudio, diseño y definición de una instalación de aprovechamiento de energía geotérmica para la climatización a lo largo de todo el año de una vivienda unifamiliar en la localidad de Fornells en el término municipal de Es Mercadal, en Menorca. Para ello, se ha calculado la demanda energética térmica requerida por la vivienda debido a su forma arquitectónica, materiales empleados y necesidades interiores, siguiendo criterios legales, funcionales y constr...

  6. La Reforma Energética: a 20 años del TLCAN

    OpenAIRE

    Vargas, Rosío

    2015-01-01

    La visita del presidente estadounidense Barack Obama a México, en mayo de 2013, fue la ocasión para buscar el acceso al petróleo y gas mexicano, amparado en el argumento de los 20 años del TLCAN, bajo "la necesidad" de su relanzamiento. Cabilderos nacionales y extranjeros se dieron a la tarea de elaborar la estrategia para la apertura total del sector energético mexicano bajo la propuesta de la Reforma Energética mexicana, aprobada el 20 de diciembre de 2013. En las modificaciones constitucio...

  7. Mejora de la eficiencia energética en una vivienda

    OpenAIRE

    Díaz Oliva, Marc

    2013-01-01

    El objetivo de este proyecto es la mejora de la eficiencia energética de la vivienda este objetivo me viene por una estancia en Alemania donde todas las viviendas están concebidas para obtener la máxima eficiencia y por consiguiente ahorro una de las cosas que más me llamo la atención fue la implantación de energías renovables ya que las horas de luz son menores a las obtenidas en España por este motivo quise comprobar cuanto se podía mejorar la eficiencia en mi vivienda y s...

  8. Estudio comparativo de eficiencia energética: Fachada ventilada frente a fachada vegetal

    OpenAIRE

    Azkorra Larrinaga, Zaloa

    2015-01-01

    398 p. + anexos En la actualidad se desarrollan multitud de investigaciones relacionadas con la rehabilitación energética lo que la ha convertido en un campo emergente en el sector de la construcción y de la arquitectura.El objetivo general de la tesis es evaluar la aplicabilidad de diferentes sistemas pasivos de rehabilitación de fachadas (fachada ventilada y fachada vegetal) y analizar los beneficios de la incorporación de dichos sistemas en el ahorro energético de edificios.Para ello, s...

  9. Energía de oleaje en la isla de Tenerife

    OpenAIRE

    Imaz Gómez, Mario

    2016-01-01

    El objeto de este proyecto es realizar todos los estudios necesarios para la construcción de la primera fase de un parque de dispositivos de extracción de energía undimotriz que permita obtener información fiable y necesaria sobre el comportamiento de los dispositivos en grupo y poder ver si el rendimiento es el esperado para posteriormente realizar las otras dos fases con el fin de abastecer a la ciudad de Puerto de la Cruz, situada en el norte de la isla de Tenerife. Actualmente las energía...

  10. Sustentabilidad empresarial, seguridad energética y ética ambiental en Chile

    OpenAIRE

    Suárez,Andrés

    2013-01-01

    El artículo explora la relación entre sustentabilidad empresarial -asociada tanto a la rentabilidad financiera como a las relaciones con colectivos locales- y el medioambiente, en el contexto de una economía internacionalizada como la chilena. Asimismo, analiza conflictos recientes originados en Chile para la provisión de energía y las dificultades en la definición de una matriz energética, y, finalmente, la influencia de la ética ecológica para la preservación de los ecosistemas de alta biod...

  11. Proyectos pilotos WHIX de energía renovable y seguridad ambiental en El Salvador.

    OpenAIRE

    Ochoa Córdova, Carlos Roberto

    2008-01-01

    El Programa WHIX aporta proyectos de Energía y Medio Ambiente para abrir un diálogo entre los militares de la Región, organizaciones gubernamentales y no-gubernamentales y sus equivalentes en los EE.UU. Este programa cataliza proyectos de energía renovable y el medioambiente para demostrar y validar estas tecnologías en los países de la región. Al mismo tiempo provee un foro de intercambio internacional de las “Mejores Prácticas” y la oportunidad de trabajar en conjunto en promisorias investi...

  12. Cómo producen energía las células

    OpenAIRE

    Carlos Alberto Ordoñez

    2014-01-01

    El adenosín trifosfato (ATP), es la moneda energética de los seres vivos. Para poder ser sintetizado, los organismos requieren oxidar los sustratos energéticos de la dieta, proteínas, grasas y carbohidratos. Inicialmente estas sustancias tienen vías metabólicas separadas hasta alcanzar en su degradación un metabolito común que es el acetil CoA. A partir de este punto entran al ciclo de Krebs, con producción de CO2 e hidrogeniones, estos últimos se transportan por óxido reducción a la cadena r...

  13. Problemas institucionales de las energías renovables en México

    OpenAIRE

    Samuel Brugger; Ma. Elena Nancy Dávila Moreno; Manuel Francisco Llamas Galván

    2011-01-01

    Este ensayo trata de explicar los problemas institucionales y jurídicos que han limitado el aprovechamiento de dichas energías alternativas. El trabajo presenta la situación actual de México; después analiza el potencial que tiene el país. De ahí se pasa al estudio de la problemática institucional y jurídica que no ha logrado fomentar la promoción de energías renovables en México.

  14. Limitaciones para el desarrollo de energías renovables en Argentina

    OpenAIRE

    Marina Yesica Recalde; Daniel Hugo Bouille; Leónidas Osvaldo Girardin

    2015-01-01

    En las últimas décadas las energías renovables han cobrado impulso a nivel mundial con un significativo impacto sobre el desarrollo sustentable de las naciones. Si bien diferentes trabajos analizan la eficiencia de políticas e instrumentos para la promoción de dichas fuentes, la mayoría de las veces se deja de lado el análisis de cómo el contexto en el cual las políticas son implementadas determina su performance. En este trabajo se analiza el desarrollo de las energías renovables en el merca...

  15. Análisis armónico de compensadores de energía reactiva

    OpenAIRE

    González Hernández, Jaime

    2011-01-01

    Desde la implantación de la generación y distribución de la energía eléctrica en corriente alterna, la energía reactiva ha sido un factor clave en el diseño y explotación de los consumos y redes eléctricas. El carácter reactivo (inductivo) que presentan, en general, los consumos y los elementos de las redes eléctricas han hecho aparecer a lo largo del tiempo distintos dispositivos y técnicas que buscan "compensar" ese carácter reactivo.

  16. Problemas institucionales de las energías renovables en México

    Directory of Open Access Journals (Sweden)

    Samuel Brugger

    2011-09-01

    Full Text Available Este ensayo trata de explicar los problemas institucionales y jurídicos que han limitado el aprovechamiento de dichas energías alternativas. El trabajo presenta la situación actual de México; después analiza el potencial que tiene el país. De ahí se pasa al estudio de la problemática institucional y jurídica que no ha logrado fomentar la promoción de energías renovables en México.

  17. Estudio de viabilidad de un sistema de generación de energía eléctrica basado en energías renovables para países en vías de desarrollo

    OpenAIRE

    Villanueva Fernández, Gemma

    2010-01-01

    En este proyecto, primero se realiza una pequeña introducción para que el lector adquiera unos conocimientos mínimos sobre las energías renovables. Posteriormente, se describe los conceptos básicos de la energía solar fotovoltaica y los materiales usados en la misma. La energía solar fotovoltaica, es una transformación de la energía luminosa en energía eléctrica. El material más utilizado en la fabricación de los paneles solares es el silicio. De igual forma, se describe conceptos básicos de ...

  18. Desarrollo e implantación de energías renovables: situación actual y tendencias

    OpenAIRE

    Picó Heras, Sergio

    2002-01-01

    En esta tesina se tratarán las posibilidades que ofrecen las energías renovables com base de una planificicación energética. El tema se enfocará tanto desde puntos de vista económicos, ambientales, técnicos, políticos, etc

  19. Clusters minero energéticos en Colombia: Desarrollo, hallazgos y propuestas

    Directory of Open Access Journals (Sweden)

    Ángela Inés Cadena

    2011-01-01

    Full Text Available En este artículo se presenta un resumen del Proyecto DNP- Universidad de los Andes sobre "Clusters" en la industria minero energética, que la Universidad de los Andes realizó para el Departamento Nacional de Planeación. Para comenzar, se hace una síntesis de la metodología empleada, que combinó análisis de tipo macro con análisis de detalle. Más adelante se exponen los hallazgos en cuanto a la caracterización y localización de las industrias minero energéticas y aquellas relacionadas. Se presentan las cuatro propuestas que se plantearon para aprovechar el crecimiento de esta industria mediante la generación de valor. La primera propuesta está relacionada con la estructuración de la función de comercialización para lograr mejoras en la productividad de la pequeña y mediana minería del carbón, la segunda con la creación de un programa nacional de desarrollo de proveedores de bienes y servicios para la industria petrolera y de gran minería. Las dos últimas propuestas se enfocan en el desarrollo de conglomerados de negocios, la primera de la petroquímica y los plásticos en la región de Bolívar - Atlántico y la otra de los nuevos materiales plásticos en Bogotá, con un papel protagónico de la academia. Es importante anotar el análisis y propuestas detalladas pueden encontrarse en los informes del proyecto.//This paper presents a summary of a Project on Clusters in the Mining and Energy Industry that the Universidad de los Andes developed for the National Planning Department. The document starts with a description of the methodology that combines macro analysis with detailed analysis. Next, we present the main findings regarding the characterization and location of the mining and energy industries, as well as of the related industries. We end with a detailed presentation of the four cluster proposals designed to create value. The first proposal relates to the structuring of the marketing function to achieve improvements

  20. Nexo agua-energía: desde el nacimiento del río Llobregat hasta Manresa

    OpenAIRE

    Prieto Márquez, Kelly; Badia Padilla, Ester; Grau Vilalta, Maria Dolors

    2017-01-01

    En este trabajo se estudia el nexo agua-energía en el tramo del río Llobregat desde Castellar de N’hug hasta Manresa. Se lleva a cabo una evaluación de la cantidad de energía necesaria en las estaciones potabilizadoras y depuradoras para adecuar el agua del río, además de determinar la cantidad de energía que generan las centrales mini-hidroeléctricas. Estos dos valores de energía finales son comparados para demostrar si se consume más energía que la que se genera, o al contrario. Se estud...

  1. El hidrógeno y la energía

    Directory of Open Access Journals (Sweden)

    Aurelio Mendoza Medellín

    2006-01-01

    Full Text Available El hidrógeno es el elemento más simple, pero es fundamental para la vida. En el futuro sustituirá a los combustibles fósiles como fuente de energía para las máquinas hechas por el hombre. Hoy en día su uso es muy caro, pero ya existen motores que trabajan quemando este gas. En el sol la fusión de hidrógeno libera cantidades inconmensurables de energía, que en parte es captada por los cloroplastos, que la transforman en la energía química contenida en los carbohidratos resultantes de la fotosíntesis. Esto implica la transferencia del hidrógeno del agua al dióxido de carbono. Los animales liberan la energía de los combustibles biológicos revirtiendo dicha reacción a través del metabolismo oxidativo, la cadena respiratoria y la fosforilación oxidativa. El hidrógeno es vital para producir ATP y por lo tanto para la vida.

  2. Effectiveness of the Energize Elementary School Program to Improve Diet and Exercise

    Science.gov (United States)

    Herbert, Patrick C.; Lohrmann, David K.; Seo, Dong-Chul; Stright, Anne D.; Kolbe, Lloyd J.

    2013-01-01

    Background: The rate of childhood obesity has more than tripled during the past 30?years. Research shows that prevention at an early age is more effective than treatment later in life. Energize is a multicomponent intervention incorporated into the school day that combines nutrition education and physical activity aimed at maintaining healthy…

  3. Gas exchange and leaf contents in bell pepper under energized water and biofertilizer doses

    Directory of Open Access Journals (Sweden)

    Francisca R. M. Borges

    2016-06-01

    Full Text Available ABSTRACT The objective of this study was to evaluate the effect of energized water and bovine biofertilizer doses on the gas exchange and NPK contents in leaves of yellow bell pepper plants. The experiment was conducted at the experimental area of the Federal University of Ceará, in Fortaleza-CE, Brazil, from June to November 2011. The experiment was set in a randomized block design, in a split-plot scheme; the plots were composed of treatments with energized and non-energized water and the subplots of five doses of liquid biofertilizer (0, 250, 500, 750 and 1000 mL plant-1 week-1. The following variables were analyzed: transpiration, stomatal conductance, photosynthesis and leaf contents of nitrogen (N, phosphorus (P and potassium (K. Water energization did not allow significant increases in the analyzed variables. The use of biofertilizer as the only source of fertilization was sufficient to provide the nutrients N, P and K at appropriate levels for the bell pepper crop.

  4. Proyecto Energético Palmdale; Decisión del Permiso Final

    Science.gov (United States)

    Proyecto Energético Palmdale: EPA Región 9 por el presente emite aviso de su decisión final, el cumplimiento con la Ley Federal de Aire Limpio, para la construcción de una planta generadora de electricidad de ciclo combinado y alimentada por gas natural

  5. Implicaciones ambientales de las tecnologías de energía renovable

    Directory of Open Access Journals (Sweden)

    Jan Mahirt-Smith

    2011-12-01

    Full Text Available Las tecnologías de energía renovable como la eólica, la solar y la biomasa, hacen un uso del suelo más intenso que las de combustibles fósiles tradicionales y, geográficamente, sus implicaciones ambientales son más heterogéneas, por lo que presentan un gran desafío para las técnicas de evaluación de su ciclo de vida. Este trabajo presenta los resultados de una investigación bibliográfica alrededor de los siguientes temas: 1 cambios en el uso del suelo debido a la mayor producción de energía renovable; 2 impactos del uso de suelo; 3 variabilidad geográfica en el inventario de datos; y 4 efectos de la distribución de energía. Además, se revisa el grado de investigación que actualmente se aplica acerca de las tecnologías de energía renovable en campos como el eólico, el solar y la bioenergía y en la evaluación del ciclo de vida en general.

  6. Redes de energía en la Argentina del siglo XXI. Proyectos locales innovadores

    Directory of Open Access Journals (Sweden)

    Silvina Carrizo

    2015-04-01

    Full Text Available En Argentina se construyeron de forma pionera, extensas redes de electricidad, gas y combustibles. El 98% de los hogares están conectados a la red eléctrica y el 51% de la población tiene acceso al gas natural por red (INDEC 2012. A pesar de la cobertura energética amplia, aún persisten en el país algunas regiones -como el Noroeste de la Provincia de Buenos Aires NOBAdonde las redes no llegan o tienen menor densidad. La región NOBA, situada entre las ciudades de Rosario y Buenos Aires, que cuentan con infraestructura considerable para su aprovisionamiento, presenta redes eléctricas y gasíferas poco densas -especialmente hacia el interior- y escaso desarrollo de fuentes de energías alternativas. En materia de gas, faltan gasoductos troncales o regionales. En el sistema eléctrico, hay poca capacidad de generación y se necesita mayor interconexión. Desde distintos niveles se han promovido alternativas en materia de producción, transporte y distribución de energía, pero los avances aún no alcanzan para asegurar la resiliencia energética enla región NOBA. En un contexto de esta índole, actores locales se han organizado para satisfacer sus necesidades energéticas con proyectos nuevos de transporte de gas y de aprovechamiento de recursos locales renovables, con un potencial que aún no ha sido puesto en valor. Abordando proyectos energéticos locales y regionales, este trabajo propone reflexionar acerca de la nueva geografía que podría delinearse en la producción y circulación de la energía, más flexible, fiable y sustentable, fomentando la innovación y la productividad, así como la equidad regional.

  7. Assessing potential impacts of energized submarine power cables on crab harvests

    Science.gov (United States)

    Love, Milton S.; Nishimoto, Mary M.; Clark, Scott; McCrea, Merit; Bull, Ann Scarborough

    2017-12-01

    Offshore renewable energy facilities transmit electricity to shore through submarine power cables. Electromagnetic field emissions (EMFs) are generated from the transmission of electricity through these cables, such as the AC inter-array (between unit) and AC export (to shore) cables often used in offshore energy production. The EMF has both an electric component and a magnetic component. While sheathing can block the direct electric field, the magnetic field is not blocked. A concern raised by fishermen on the Pacific Coast of North America is that commercially important Dungeness crab (Metacarcinus magister Dana, 1852)) might not cross over an energized submarine power cable to enter a baited crab trap, thus potentially reducing their catch. The presence of operating energized cables off southern California and in Puget Sound (cables that are comparable to those within the arrays of existing offshore wind energy devices) allowed us to conduct experiments on how energized power cables might affect the harvesting of both M. magister and another commercially important crab species, Cancer productus Randall, 1839. In this study we tested the questions: 1) Is the catchability of crabs reduced if these animals must traverse an energized power cable to enter a trap and 2) if crabs preferentially do not cross an energized cable, is it the cable structure or the EMF emitted from that cable that deters crabs from crossing? In field experiments off southern California and in Puget Sound, crabs were given a choice of walking over an energized power cable to a baited trap or walking directly away from that cable to a second baited trap. Based on our research we found no evidence that the EMF emitted by energized submarine power cables influenced the catchability of these two species of commercially important crabs. In addition, there was no difference in the crabs' responses to lightly buried versus unburied cables. We did observe that, regardless of the position of the cable

  8. Classical dynamics of triatomic system: energized harmonic molecules

    International Nuclear Information System (INIS)

    Parr, C.A.; Kuppermann, A.; Porter, R.N.

    1976-01-01

    The dynamical assumptions underlying the Slater and RRK classical-mechanical theories of unimolecular reaction rates are investigated. The predictions of these theories for several nonlinear, triatomic, harmonically-bonded molecular models are compared with the results obtained from the integration of the classical equations of motion. The accuracy of the small-vibration and weak-coupling assumptions are found to break down at energies above about one quarter of a bond dissociation energy. Nonetheless, the small-vibration approximation predicts reaction frequencies in good agreement with the exact results for the models. The effects of rotation on intramolecular energy exchange are examined and found to be significant

  9. Lifetime cost effectiveness of a through-school nutrition and physical programme: Project Energize.

    Science.gov (United States)

    Rush, Elaine; Obolonkin, Victor; McLennan, Stephanie; Graham, David; Harris, James D; Mernagh, Paul; Weston, Adéle R

    2014-01-01

    Project Energize, a multicomponent through-school physical activity and nutrition programme, is delivered to all primary school children in the Waikato region. The programme aim is to improve the overall health and reduce the rate of weight gain of all Waikato primary school children. An existing economic model was used to extrapolate the programme effects, initial costs, lifetime health treatment cost structures, quality-adjusted-life-years gained and increased life expectancy to the general and Māori child population of New Zealand. In March 2011, a sample of 2474 younger (7.58 ± 0.57 years, mean ± SD) and 2330 older (10.30 ± 0.51 years) children (36% Māori) attending Energize schools had body mass index measured and compared using mixed effect modelling with unEnergized comparison children from 2004 and 2006 from the same region. In 2011 the median body mass index reduction compared with the comparison younger children was -0.504 (90% CI -0.435 to -0.663) kg/m(2) and in the older children -0.551 (-0.456 to -0.789) kg/m(2). In 2010 there were 42,067 children attending Energize schools and in the same year NZ$1,891,175 was spent to deliver the programme; a cost of $44.96/child/year. Compared to the comparison children the increment in cost/quality-adjusted-life-year gained was $30,438 for the younger and $24,690 for the older children, and lower for Māori (younger $28,241, older $22,151) and for the middle socioeconomic status schools ($23,211, $17,891). Project Energize would improve quality and length of life and when compared with other obesity prevention programmes previously assessed with this model, it would be relatively cost-effective from the health treatment payer's perspective.

  10. La energía nuclear y la industria en Francia

    Directory of Open Access Journals (Sweden)

    Roux, A.

    1980-09-01

    Full Text Available In this article an analysis is made of the favorable effects for industry involved in the development of nuclear energy and the interaction between them. Reference is made to the problem of energy supply in France and the need for an effort in energy savings, to the development of new sources and priority in the establishment of an important program of nuclear power plants. Also, an analysis is made of the role of Industry, the Atomic Energy and Electricity Commission of France in the supply and processing of the nuclear materials. Finally, a general review of the manpower and technical means presently available is made, as well as an examination of the investments foreseen for local development of this energy.

    En este artículo se analizan los efectos favorables que para la Industria tiene el desarrollo de la energía nuclear y las interacciones entre ambas. Se hace referencia al problema del aprovisionamiento energético en Francia y a la necesidad de un esfuerzo en materia de ahorro de energía, al desarrollo de nuevas fuentes y a la prioridad en el establecimiento de un importante programa de centrales nucleares. También es analizado el papel de la Industria, la Comisaría de Energía Atómica y Electricidad de Francia en el abastecimiento y en la transformación de los materiales nucleares. Por último, se hace un repaso general de los medios humanos y técnicos con que se cuenta en la actualidad, así como de las inversiones previstas para un desarrollo nacional de esta energía.

  11. Investigation into the behavior of metal-argon polyatomic ions (MAr+) in the extraction region of inductively coupled plasma-mass spectrometry

    International Nuclear Information System (INIS)

    Ebert, Chris H.; Witte, Travis M.; Houk, R.S.

    2012-01-01

    The abundances of metal-argon polyatomic ions (MAr + ) are determined in inductively coupled plasma-mass spectrometry (ICP-MS). The ratios of MAr + abundance to that for M + ions are measured experimentally. These ratios are compared to expected values, calculated for typical plasma conditions using spectroscopic data. For all metals studied (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn), the measured ratios are significantly lower than the calculated ratios. Increasing the plasma potential (and thereby increasing the ion kinetic energy) by means of a homemade guard electrode with a wide gap further reduces the MAr + /M + ratio. Implementing a skimmer cone designed for high transmission of light ions increases the MAr + abundance. Considering this evidence, the scarcity of MAr + ions is attributed to collision induced dissociation (CID), likely due to a shock wave at the tip of or in the throat of the skimmer cone. - Highlights: ► MAr + ions are less abundant in the mass spectrum than expected from the ICP. ► Increasing the plasma potential reduces their abundance further. ► The extraction lens voltage does not greatly affect the MAr + abundances. ► The weakly-bound MAr + ions are probably dissociated by collisions during extraction.

  12. Reference interaction site model with hydrophobicity induced density inhomogeneity: An analytical theory to compute solvation properties of large hydrophobic solutes in the mixture of polyatomic solvent molecules

    International Nuclear Information System (INIS)

    Cao, Siqin; Sheong, Fu Kit; Huang, Xuhui

    2015-01-01

    Reference interaction site model (RISM) has recently become a popular approach in the study of thermodynamical and structural properties of the solvent around macromolecules. On the other hand, it was widely suggested that there exists water density depletion around large hydrophobic solutes (>1 nm), and this may pose a great challenge to the RISM theory. In this paper, we develop a new analytical theory, the Reference Interaction Site Model with Hydrophobicity induced density Inhomogeneity (RISM-HI), to compute solvent radial distribution function (RDF) around large hydrophobic solute in water as well as its mixture with other polyatomic organic solvents. To achieve this, we have explicitly considered the density inhomogeneity at the solute-solvent interface using the framework of the Yvon-Born-Green hierarchy, and the RISM theory is used to obtain the solute-solvent pair correlation. In order to efficiently solve the relevant equations while maintaining reasonable accuracy, we have also developed a new closure called the D2 closure. With this new theory, the solvent RDFs around a large hydrophobic particle in water and different water-acetonitrile mixtures could be computed, which agree well with the results of the molecular dynamics simulations. Furthermore, we show that our RISM-HI theory can also efficiently compute the solvation free energy of solute with a wide range of hydrophobicity in various water-acetonitrile solvent mixtures with a reasonable accuracy. We anticipate that our theory could be widely applied to compute the thermodynamic and structural properties for the solvation of hydrophobic solute

  13. Cuantificación del potencial energético undimotriz en las costas del Caribe colombiano

    Directory of Open Access Journals (Sweden)

    Jaime P

    2017-11-01

    Full Text Available En este documento se describen los avances en la cuantificación de la energía de las olas de la costa caribeña colombiana. La metodología utilizada servirá como punto de partida para establecer el potencial energético en Colombia para este tipo de suministro energético. En la actualidad, el potencial energético teórico estimado en las ondas de la costa cercana en la costa atlántica es de aproximadamente 1107 MW y esto fue posible con datos que se han recogido y procesado desde enero de 2014. Las ecuaciones que tienen en cuenta variables tales como: la densidad del agua de mar, la temperatura y la velocidad del viento en la zona. También muestra el progreso del diseño del sistema Near Shore para la verificación del potencial de energía de las olas que consiste en un dispositivo que transforma la energía cinética de las ondas del mar en energía potencial gravitacional que se va a usar para mover un generador de corriente alterna.

  14. Energized overhead ground wires - OHGWs the pioneer Brazilian application

    Energy Technology Data Exchange (ETDEWEB)

    D` Ajuz, Ary; Martinez, Manuel L.B.; Araujo, Ana Maria R; Takai, Mario Noboru; Sganzerla, Flavio [ELETRONORTE, Brasilia, DF (Brazil); O, Junior, Helio P; Fonseca, Claudio S [Marte Engenharia (Brazil); Guimaraes, R P; Mendes, Eloisa R

    1994-12-31

    This paper introduces an economical solution for close HV lines small villages and farms load supply. The needed modifications to adapt a planned transmission system to supply loads located along the lines routes are presented. The paper describes the two overhead ground wires scheme planned for implementation in the 230 kV transmission line under construction by ELETRONORTE in Mato Grosso and Rondonia supplying loads each one totaling roughly 8 MW. (author) 4 refs., 4 figs., 2 tabs.

  15. La utilización eficaz del hormigón térmico en rehabilitación energética de edifcios

    OpenAIRE

    Moraño Rodríguez, Alfonso Javier

    2016-01-01

    Como sabrá el lector, se ha establecido en España por consecuencia de la Directiva 2012/27/ UE, un Programa de Ayudas para la Rehabilitación Energética de Edificios existentes (Programa PAREER-CRECE) con el fin de incentivar y promover la realización de actuaciones de reforma que favorezcan el ahorro energético, la mejora de la eficiencia energética, el aprovechamiento de las energías renovables y la reducción de emisiones de dióxido de carbono. El Ministerio de Industria, Energía y Turismo, ...

  16. Proyecto de vivienda energéticamente sostenible situada en Ontinyent (Valencia). Instalación fotovoltaica.

    OpenAIRE

    MOLLÁ CALABUIG, SERGIO

    2015-01-01

    [ES] Se van a diseñar las instalaciones necesarias para que una vivienda unifamiliar sea energéticamente sostenible. La única fuente de energía disponible es la solar Se calcualrán las instalaciones para dos opciones. 1. Vivienda conectada a la red eléctrica general. 2. Vivienda aislada de la red eléctrica. [ES] El objeto de este trabajo es el diseño y comparación, de las instalaciones necesarias para que una vivienda unifamiliar sea energéticamente sostenible, con la única fuen...

  17. Proyecto de vivienda energéticamente sostenible situada en Almería. Instalación fotovoltaica.

    OpenAIRE

    CORBERÁ FERRANDO, JOSÉ Mª

    2015-01-01

    [ES] Se van a diseñar las instalaciones necesarias para que una vivienda unifamiliar sea energéticamente sostenible. La única fuente de energía disponible es la solar Se calcualrán las instalaciones para dos opciones. 1. Vivienda conectada a la red eléctrica general. 2. Vivienda aislada de la red eléctrica. Corberá Ferrando, JM. (2015). Proyecto de vivienda energéticamente sostenible situada en Almería. Instalación fotovoltaica. http://hdl.handle.net/10251/53541. TFGM

  18. Planeamiento estratégico del sector de las fuentes no convencionales de energía renovable en Colombia

    OpenAIRE

    Torres Wilches, Carlos Rolando; Rojas Patiño, Alejandro; Higuera Rincón, Diana Astrid; Hernández Henríquez, Jorge Daniel; Calle Forero, Jorge Alberto

    2017-01-01

    xiv, 192 h. : il. ; 30 cm. A través de los años y en el ámbito mundial, la generación de energía eléctrica por medio de fuentes no convencionales de energía como el sol, el viento, la biomasa, y la energía mareomotriz, ha estado creciendo constantemente tanto en capacidad instalada (i.e., megawatt) como en número de proyectos implementados. Parte importante de este crecimiento se debe a la mejora continua en la tecnología de producción que utilizan entre otros los paneles so...

  19. Liga de magnésio como material para bateria de alta densidade energética

    OpenAIRE

    Munhoz, Igor Polezi

    2014-01-01

    Orientador: Prof. Dr. Jorge Tomioka Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, 2014. No contexto energético, as mudanças climáticas e as crescentes crises energéticas aumentaram as preocupações e as pesquisas na área de acumuladores de energia, visando alcançar melhorias no cenário energético e ambiental global. Ao mesmo tempo, a sociedade tornou-se dependente do consumo de energia elétrica, sendo que falhas no fornec...

  20. Estimación del potencial de energías renovables en el estado de Sonora

    OpenAIRE

    Jorge Luis Taddei Bringas; María de los Ángeles Navarrete Hinojosa; Pablo Daniel Taddei Arriola; Rafael Cabanillas López.

    2016-01-01

    La etapa de uso de combustibles fósiles está llegando a su fin, debido principalmente a la escasez y problemas de contaminación que originan. En la actualidad existe una marcada tendencia en aprovechar las fuentes renovables de energía, por su bajo impacto ambiental y menor emisión de gases de efecto invernadero (GEI), lo cual contribuye a independizar las políticas energéticas locales de las del mercado global, basadas en la supremacía petrolera. Para obtener el mayor provecho de las energía...

  1. El tejido adiposo: algo más que un reservorio de energía

    Directory of Open Access Journals (Sweden)

    Sanhueza C, Julio

    2009-12-01

    Full Text Available Adipose tissue is a reservoir of energy and also an organ that contributes to the aesthetics and health of human body working as an endocrine tissue. White adipose tissue, which is formed by unilocular adipose cells, can modify organic homeostasis by controlling energy expenditure and consumption and by producing adipokines that regulate food consumption, and carbohydrate and lipid metabolic utilization. Brown adipose tissue is structured by multilocular cells containing many small fat drops that can be easily hydrolyzed. This tissue is involved in adaptative or facultative thermogenesis because it contains the uncoupling-1 protein (UCP-1 which by inhibiting ATP synthesis releases heat. The size of brow adipose tissue is reduced with aging and the most recent future strategies to fight obesity may be by transforming white cells into brown adipose tissue. The present work reviews the main structural and functional characteristics of white and brown adipose tissue with emphasis in its endocrine and regulatory function.El tejido adiposo es un reservorio de grasa y también un órgano que contribuye a la estética y a la salud de las personas, tarea que cumple funcionando como un tejido endocrino. El tejido adiposo blanco, formado por células adiposas uniloculares puede regular la homeostasis orgánica entre el gasto y el consumo de energía. Produce una serie de adipokinas que regulan el consumo de alimentos, la utilización de glucosa y de lípidos por parte del organismo. El tejido adiposo pardo o marrón, estructurado por células multiloculares, contiene numerosas gotas de grasa de pequeño tamaño, las que pueden ser hidrolizadas con mayor facilidad. El tejido participa en la termogénesis adaptativa o facultativa debido a la proteína desacoplante-1 (UCP-1 que inhibe la síntesis de ATP produciendo calor. Con la edad, este tejido se reduce y por ello actualmente se considera que una forma de combatir la obesidad es lograr que el tejido

  2. Mechanism of Occurring Over-Voltage Phenomena in Distributed Power System on Energization of Transformers

    Science.gov (United States)

    Nakachi, Yoshiki; Ueda, Fukashi; Kajikawa, Takuya; Amau, Tooru; Kameyama, Hirokazu; Ito, Hisanori

    This paper verifies the mechanism of occurring over voltage phenomena in the distributed power system on energizing the transformer. This over-voltage, which is observed at the actual distributed power system, with heavy inrush current is found to occur at about 0.1-0.2sec after the energizing and continue for a duration of more than 0.1[sec]. There is a concern that this over-voltage may operate the protection relay and deteriorate the insulation of apparatus. It is basically caused by the resonance between the shunt capacitors and saturated/unsaturated magnetizing inductance of transformer, system inductance. By using analytical formulation of a simple equivalent circuit, its mechanism has been verified through simulations carried out by using EMTP. Moreover, the sympathetic interaction between transformers is prolonged the duration of the over-voltage by the field test data is discussed in this paper.

  3. Integración energética: una incertidumbre regulatoria

    Directory of Open Access Journals (Sweden)

    María de la Cruz Bayá C.

    2006-01-01

    Full Text Available Este artículo pretende introducir en la reflexión de los elementos que están insertos hoy por hoy en la agenda de la integración energética, como uno de los baluartes más importantes para la consolidación de los procesos subregionales ya que establece, per se, la base de la nueva configuración de las relaciones interestatales a partir de la relación de oferta y demanda energética. En este sentido, los métodos utilizados en la presente investigación han sido el exegético, comparado, estudio de caso y bibliográfico, lo cual ha permitido concluir que se requiere de la generación de un marco regulatorio comunitario armonizado, vinculado a los principios de supranacionalidad y de sustentabilidad.

  4. D0 Central Tracking Solenoid Energization, Controls, Interlocks and Quench Protection Initial Validation Procedures

    International Nuclear Information System (INIS)

    Jaskierny, W.; Hance, R.

    1998-01-01

    This note presents the inspection and tests to be performed on the DZERO solenoid energization, controls, interlocks and quench protection system before it is energized for the first time. This test is to be performed with a 5000A jumper at the end of the bus instead of the solenoid. This system is based in DZERO room 511. A copy of this note shall be annotated, signed and dated by the person coordinating the procedure; and filed with the system maintenance records. Annotations shall include comments about any aspect of the procedure that is abnormal or unsuccessful. The following inspections and tests shall be performed by persons knowledgeable about the system. Each individual test step should be reviewed and understood before proceeding with that step.

  5. Programación por metas Energía alternativa mediante biomasa.

    Directory of Open Access Journals (Sweden)

    Guerrero Casas, Flor María

    2003-01-01

    Full Text Available En este trabajo se presenta un modelo multicriterio de localización de centrales de generación de energía eléctrica mediante biomasa. Los objetivos considerados son: (1 minimizar el coste total de la operación, (2 maximizar la producción de electricidad obtenida, (3 maximizar la distancia entre plantas, (4 maximizar la aceptación social y (5 establecer las plantas o ampliaciones en aquellos lugares donde exista una mayor predisposición por parte de las administraciones locales. Finalmente, se concluye con una aplicación práctica mediante programación por metas ponderadas para la región andaluza, considerando los residuos procedentes del olivar como fuente de energía.

  6. Costa Rica: Hydroelectric utility Energía Global finances upstream reforestation

    OpenAIRE

    Energía Global (Global Energy S.A.); The National Forest Office; National Fund for Forest Financing (FONAFIFO)

    2006-01-01

    Metadata only record The goal of Energía Global is to increase both the stream flow and decrease sedimentation in the hydroelectric reservoirs. They are attempting to do this by reforestation projects as well as forest conservation. The sources of revenue for this project are from the private hydroelectric company and the government through taxes on fossil fuels. PES-1 (Payments for Environmental Services Associate Award)

  7. Voltage dip caused by the sequential energization of wind turbine transformers

    DEFF Research Database (Denmark)

    Arana Aristi, Iván; Holbøll, Joachim; Sørensen, T.

    2009-01-01

    motors, this recommendation automatically applies to the wind turbine transformers in a wind farm, regardless of the fact that wind turbine transformers are rarely energized and the investment of timed relays might be significant. At the design stage of the collection grid of large offshore wind farms...... farms in Denmark and the UK. However, there is still work to be done to optimize the investment and protection system of the internal grid of the wind power plants....

  8. D0 Central Tracking Solenoid Energization, Controls, Interlocks and Quench Protection Operating Procedures

    International Nuclear Information System (INIS)

    Hance, R.

    1998-01-01

    This procedure is used when it is necessary to operate the solenoid energization, controls, interlocks and quench detection system. Note that a separate procedure exists for operating the solenoid 'cryogenic' systems. Only D0 Control Room Operators or the Project Electrical Engineer are qualified to execute these procedures or operate the solenoid system. This procedure assumes that the operator is familiar with using the Distributed Manufacturing Automation and Control Software (DMACS).

  9. Assessing energy efficiency of electric car bottom furnaces intended for thermal energization of minerals

    Science.gov (United States)

    Nizhegorodov, A. I.

    2017-01-01

    The paper deals with a new concept of electric furnaces for roasting and thermal energization of vermiculite and other minerals with vibrational transportation of a single-layer mass under constant thermal field. The paper presents performance calculation and comparative assessment of energy data for furnaces of different modifications: flame and electric furnaces with three units, furnaces with six units and ones with series-parallel connection of units, and furnaces of new concept.

  10. Transformer inrush current reduction through sequential energization for wind farm applications

    Energy Technology Data Exchange (ETDEWEB)

    Abdulsalam, S.; Xu, W. [Alberta Univ., Edmonton, AB (Canada)

    2008-07-01

    Wind power is considered as one of the fastest growing technologies in the power industry. The electrical configuration of a wind farm consists of long spans of medium voltage collector feeders. Each wind generator is connected to the collector circuit/feeder through either a pad mount oil filled, or a nacelle-mounted dry type transformer. All collector feeders connect to a single collector substation where the connection to the high-voltage transmission is established through a step up transformer. With a large number of wind generators per feeder, large inrush current will flow due to simultaneous transformer energization which can cause high voltage sag at the point of common coupling. Wind farms are generally located in unpopulated remote areas where no access to strong network connection is feasible. It is common to have the PCC on a relatively weak location on the sub-transmission/distribution network. In order to meet interconnection standards requirements, the amount of voltage sag due to the energization of a number of transformers needs to be evaluated. This paper presented an effective solution to the mitigation of inrush currents and associated voltage sag for wind farm applications. The paper presented a diagram of a typical configuration of a wind farm electrical distribution system and also described the analytical methodologies for the evaluation of inrush current level together with simulation results. A simplified analysis and sizing criteria for the associated neutral resistor size was presented. It was concluded that the scheme could significantly reduce inrush current level when a large number of transformers are simultaneously energized. The presented application eliminates the need to sectionalize feeders, thereby simplifying them for the energization process. 6 refs., 5 figs.

  11. Investigation of Prevalence of Energizer Drugs and Supplements Consumption and Effective Factors Among Bodybuilder Men in Karaj (2011)

    OpenAIRE

    F. Shoshtarizadeh; F. Bahramian; A.A. Safari; M. Pourghaderi; H. Barati

    2013-01-01

    Background: Body builder athletes’ high attention to form of body can result in high prevalence of nutritional disorders and habit to energizer drugs consumption. With notice to abuse problems of these drugs, this research was carried out to estimate prevalence of energizer drugs and supplements consumption in Karaj body builder men in 2011. Method: In cross-sectional (description- analytical) research 780 Karaj body builder men were selected randomly. Data were collected through interv...

  12. Estudio regional del potencial de secado con aire natural y energía solar

    Directory of Open Access Journals (Sweden)

    Jorge Domínguez P.

    1983-09-01

    Full Text Available En este artículo se presenta y aplica una metodología de trabajo basada en la técnica de simulación matemática y desarrollada con el fin de realizar estudios sobre el potencial de secado de productos agropecuarios con aire natural y energía solar de regiones tropicales. La metodología se basa en el uso de un programa de computador e Incluye otros elementos metodológicos en relación con el manejo de la información meteorológica, el patrón de operación del ventilador, el uso de energía solar y la interpretación de los resultados con el fin de optimizar el sistema. Se reportan los resultados del estudio del potencial de secado con aire natural y energía solar de Tuluá (Valle y se proporcionan recomendaciones específicas para la implementación de sistemas de secado a bala temperatura en la Reglón.

  13. A statistical study of ion energization at 1700 km in the auroral region

    Directory of Open Access Journals (Sweden)

    M. Hamrin

    2002-12-01

    Full Text Available We present a comprehensive overview of several potentially relevant causes for the oxygen energization in the auroral region. Data from the Freja satellite near 1700 km altitude are used for an unconditional statistical investigation. The data are obtained in the Northern Hemisphere during 21 months in the declining phase of the solar cycle. The importance of various wave types for the ion energization is statistically studied. We also investigate the correlation of ion heating with precipitating protons, accelerated auroral electrons, suprathermal electron bursts, the electron density variations, Kp index and solar illumination of the nearest conjugate ionosphere. We find that sufficiently strong broad-band ELF waves, electromagnetic ion cyclotron waves, and waves around the lower hybrid frequency are foremost associated with the ion heating. However, magnetosonic waves, with a sharp, lower frequency cutoff just below the proton gyrofrequency, are not found to contribute to the ion heating. In the absence of the first three wave emissions, transversely energized ions are rare. These wave types are approximately equally efficient in heating the ions, but we find that the main source for the heating is broadband ELF waves, since they are most common in the auroral region. We have also observed that the conditions for ion heating are more favourable for smaller ratios of the spectral densities SE /SB of the broadband ELF waves at the oxygen gyrofrequency.Key words. Ionosphere (auroral ionosphere; wave propogation Magnetospheric physics (electric fields

  14. The role of fluid compression in energy conversion and particle energization during magnetic reconnection

    Science.gov (United States)

    Li, X.; Guo, F.; Li, G.; Li, H.

    2016-12-01

    Theories of particle transport and acceleration have shown that fluid compression is the leading mechanism for particle acceleration and plasma energization. However, the role of compression in particle acceleration during magnetic reconnection is unclear. We use two approaches to study this issue. First, using fully kinetic simulations, we quantitatively calculate the effect of compression in energy conversion and particle energization during magnetic reconnection for a range of plasma beta and guide field. We show that compression has an important contribution for the energy conversion between the bulk kinetic energy and the internal energy when the guide field is smaller than the reconnecting component. Based on this result, we then study the large-scale reconnection acceleration by solving the Parker's transport equation in a background reconnecting flow provided by MHD simulations. Due to the compression effect, the simulations suggest fast particle acceleration to high energies in the reconnection layer. This study clarifies the nature of particle acceleration in reconnection layer, and may be important to understand particle acceleration and plasma energization during solar flares.

  15. Ion Composition and Energization in the Earth's Inner Magnetosphere and the Effects on Ring Current Buildup

    Science.gov (United States)

    Keika, K.; Kistler, L. M.; Brandt, P. C.

    2014-12-01

    In-situ observations and modeling work have confirmed that singly-charged oxygen ions, O+, which are of Earth's ionospheric origin, are heated/accelerated up to >100 keV in the magnetosphere. The energetic O+ population makes a significant contribution to the plasma pressure in the Earth's inner magnetosphere during magnetic storms, although under quiet conditions H+ dominates the plasma pressure. The pressure enhancements, which we term energization, are caused by adiabatic heating through earthward transport of source population in the plasma sheet, local acceleration in the inner magnetosphere and near-Earth plasma sheet, and enhanced ion supply from the topside ionosphere. The key issues regarding stronger O+ energization than H+ are non-adiabatic local acceleration, responsible for increase in O+ temperature, and more significant O+ supply than H+, responsible for increase in O+ density. Although several acceleration mechanisms and O+ supply processes have been proposed, it remains an open question what mechanism(s)/process(es) play the dominant role in stronger O+ energization. In this paper we summarize important spacecraft observations including those from Van Allen Probes, introduces the proposed mechanisms/processes that generate O+-rich energetic plasma population, and outlines possible scenarios of O+ pressure abundance in the Earth's inner magnetosphere.

  16. Diagnóstico energético en el proceso de molienda de la laterita

    Directory of Open Access Journals (Sweden)

    Reynaldo Laborde-Brown

    2004-03-01

    Full Text Available El consumo específico de energía en el proceso de molienda del mineral laterítico en la empresa Comandante Ernesto Che Guevara de Moa no muestra un comportamiento estable, lo que repercute en el aumento de los costos de producción. Para determinar las causas que originan estas variaciones se realizó una investigación en la unidad de molienda, específicamente en sus dos equipos principales: el molino de bolas y el ventilador de recirculación. Los resultados arrojaron que la variabilidad observada en el consumo energético se debe, fundamentalmente, a la ausencia de estabilidad en el flujo de alimentación de los molinos. Se obtiene un modelo estadístico que permite predecir el comportamiento del consumo específico de energía en función de la productividad diaria de la sección de molienda.

  17. Variaciones de voltaje: Mala calidad de la energía

    Directory of Open Access Journals (Sweden)

    Norberto Rodríguez Barallobre

    2011-02-01

    Full Text Available Este es el primero de una serie de artículos encaminados a tratar la creciente problemática de la calidadde la energía en las instalaciones industriales debida al incremento del uso de la electrónica y suscomponentes contaminantes de la energía eléctrica entendida como el producto de la onda de corriente yla de voltaje. Además, se ofrece un procedimiento para estimar el costo de las pérdidas técnicas ytecnológicas por concepto de una mala calidad de la energía así como, algunas recomendaciones paramitigar estas pérdidas millonarias en el sector industrial.  This is a first of a series of papers toward to treat the power quality growing problematical in industrialinstallations networks, due to increasing use of electronic and its polluting components, learned as aproduct of the current and voltage wave, Also is offered a procedure to estimate the technical andtechnological losses cost due to the low quality energy, some recommendations to mitigate this millonairelosses in the industrial sector

  18. Ahorro energético mediante estrategias de iluminación natural optimizadas

    Directory of Open Access Journals (Sweden)

    Puigdomènech Franquesa, Joan

    1986-04-01

    Full Text Available Electrical charges in buildings and specially in those of commercial use, can be diminished by means of natural lighting strategies. Taking the climate features of our country into consideration, it is necessary to prevent the inconveniences caused by an en erg y excess in summer, so solar Controls are needed. The only practical way to achieve the suitable balance between thermal and light needs, so as to get a monthly or annual energetic balance optimization, is to operate with the computer. A programme with such characteristics is described here. Its application gives important sarings in non renouvable energy savings.Mediante estrategias de iluminación natural es posible disminuir las cargas eléctricas de los edificios y en especial los de uso comercial. Dadas las características climáticas de nuestro país es necesario prever los inconvenientes de un exceso de energía en verano, para lo cual es preciso disponer de controles solares. Encontrar el correcto equilibrio entre las necesidades térmicas y lumínicas en base a la optimización del balance energético mensual o anual es únicamente factible mediante el uso del ordenador. Un programa que responde a estas características es descrito en el presente trabajo, obteniéndose con su aplicación importantes ahorros en el consumo de energías no renovables.

  19. Research directed at developing a classical theory to describe isotope separation of polyatomic molecules illuminated by intense infrared radiation. Final report, May 7-September 30, 1979

    International Nuclear Information System (INIS)

    Lamb, W.E. Jr.

    1981-12-01

    This final report describes research on the theory of isotope separation produced by the illumination of polyatomic molecules by intense infrared laser radiation. This process is investigated by treating the molecule, sulfur hexafluoride, as a system of seven classical particles that obey the Newtonian equations of motion. A minicomputer is used to integrate these differential equations. The particles are acted on by interatomic forces, and by the time-dependent electric field of the laser. We have a very satisfactory expression for the interaction of the laser and the molecule which is compatible with infrared absorption and spectroscopic data. The interatomic potential is capable of improvement, and progress on this problem is still being made. We have made several computer runs of the dynamical behavior of the molecule using a reasonably good model for the interatomic force law. For the laser parameters chosen, we find that typically the molecule passes quickly through the resonance region into the quasi-continuum and even well into the real continuum before dissociation actually occurs. When viewed on a display terminal, the motions are exceedingly complex. As an aid to the visualization of the process, we have made a number of 16 mm movies depicting a three-dimensional representation of the motion of the seven particles. These show even more clearly the enormous complexity of the motions, and make clear the desirability of finding ways of characterizing the motion in simple ways without giving all of the numerical detail. One of the ways to do this is to introduce statistical parameters such as a temperature associated with the distribution of kinetic energies of the single particle. We have made such an analysis of our data runs, and have found favorable indications that such methods will prove useful in keeping track of the dynamical histories

  20. Molecular eigenstate spectroscopy: Application to the intramolecular dynamics of some polyatomic molecules in the 3000 to 7000 cm{sup {minus}1} region

    Energy Technology Data Exchange (ETDEWEB)

    Perry, D.S. [Univ. of Akron, OH (United States)

    1993-12-01

    Intramolecular vibrational redistribution (IVR) appears to be a universal property of polyatomic molecules in energy regions where the vibrational density of states is greater than about 5 to 30 states per cm{sup {minus}1}. Interest in IVR stems from its central importance to the spectroscopy, photochemistry, and reaction kinetics of these molecules. A bright state, {var_phi}{sub s}, which may be a C-H stretching vibration, carries the oscillator strength from the ground state. This bright state may mix with bath rotational-vibrational levels to form a clump of molecular eigenstates, each of which carries a portion of the oscillator strength from the ground state. In this work the authors explicitly resolve transitions to each of these molecular eigenstates. Detailed information about the nature of IVR is contained in the frequencies and intensities of the observed discrete transitions. The primary goal of this research is to probe the coupling mechanisms by which IVR takes place. The most fundamental distinction to be made is between anharmonic coupling which is independent of molecular rotation and rotationally-mediated coupling. The authors are also interested in the rate at which IVR takes place. Measurements are strictly in the frequency domain but information is obtained about the decay of the zero order state, {var_phi}{sub s}, which could be prepared in a hypothetical experiment as a coherent excitation of the clump of molecular eigenstates. As the coherent superposition dephases, the energy would flow from the initially prepared mode into nearby overtones and combinations of lower frequency vibrational modes. The decay of the initially prepared mode is related to a pure sequence infrared absorption spectrum by a Fourier transform.

  1. The Dynamics of Large-Amplitude Motion in Energized Molecules

    Energy Technology Data Exchange (ETDEWEB)

    Perry, David S. [Univ. of Akron, OH (United States). Dept. of Chemistry

    2016-05-27

    Chemical reactions involve large-amplitude nuclear motion along the reaction coordinate that serves to distinguish reactants from products. Some reactions, such as roaming reactions and reactions proceeding through a loose transition state, involve more than one large-amplitude degree of freedom. Because of the limitation of exact quantum nuclear dynamics to small systems, one must, in general, define the active degrees of freedom and separate them in some way from the other degrees of freedom. In this project, we use large-amplitude motion in bound model systems to investigate the coupling of large-amplitude degrees of freedom to other nuclear degrees of freedom. This approach allows us to use the precision and power of high-resolution molecular spectroscopy to probe the specific coupling mechanisms involved, and to apply the associated theoretical tools. In addition to slit-jet spectra at the University of Akron, the current project period has involved collaboration with Michel Herman and Nathalie Vaeck of the Université Libre de Bruxelles, and with Brant Billinghurst at the Canadian Light Source (CLS).

  2. Energizing and depletion of neutrals by a collisional plasma

    International Nuclear Information System (INIS)

    Fruchtman, A

    2008-01-01

    Neutral depletion can significantly affect the steady state of low temperature plasmas. Recent theoretical analyses predicted previously unexpected effects of neutral depletion in both collisional and collisionless regimes. In this paper we address the effect of the energy deposited in the neutral gas by a collisional plasma. The fraction of power deposited in the neutrals is shown to be independent of the amount of power. The first case we address is of a thermalized neutral gas. It is shown that a low heat conductivity of the neutral gas is followed by a high neutral temperature that results in a high neutral depletion even if the plasma pressure is small. In the second case neutrals are accelerated through charge exchange with ions leading to what we call neutral pumping, which is equivalent to ion pumping in a collisionless plasma. Neutral depletion is found in the second case for both a closed system (no net mass flow) and an open system (a finite mass flow). A thruster that employs a collisional plasma and pumped neutrals is compared with the thruster analyzed before that employs collisionless plasma.

  3. Heliospheric MeV energization due to resonant interaction

    International Nuclear Information System (INIS)

    Roth, Ilan

    2001-01-01

    The prompt enhancement of relativistic electron flux during active geomagnetic periods, and the impulsive increase in the flux of the heliospheric energetic heavy ions during active solar periods are of major importance with respect to the proper operation of electronics on space-borne spacecraft and the safety of interplanetary human travel, respectively. Both enhancements may be caused by resonant wave-particle interaction with oblique electromagnetic waves on the terrestrial and coronal field lines. Whistler waves, which are enhanced significantly during substorms and which propagate obliquely to the magnetic field, can interact with energetic electrons through Landau, cyclotron, and higher harmonic resonant interactions when the Doppler-shifted wave frequency equals any (positive or negative) integer multiple of the local relativistic gyrofrequency. This interaction occurs over a broad spatial region when a relativistic electron is bouncing in the terrestrial magnetic field. Coronal ions interact selectively with electromagnetic ion-cyclotron (emic) waves which are correlated with impulsive flares. This interaction occurs over a small spatial region when the Doppler-shifted frequency matches the first or higher harmonic of the ion gyrofrequency. Recent new observations of terrestrial MeV X-rays are interpreted as a resonant loss of the radiation belt electrons

  4. Estudio de la energía y el medio ambiente: una propuesta didáctica computarizada

    Directory of Open Access Journals (Sweden)

    Edwin Francisco Bonza Camargo

    2009-09-01

    Full Text Available El objetivo de este proyecto es desarrollar un material educativo computarizado, MEC, para la enseñanza de la energía; contribuyendo de esta manera a solucionar una de las grandes falencias del sistema educativo colombiano: la falta de material didáctico en las aulas de las escuelas y colegios. Además, con la aplicación de este material se aporta a la creación de conciencia en la población escolar hacia un uso más racional de la energía en pro del medio ambiente. El software se diseñó con base en el manejo de lecturas, imágenes, sonidos, videos y animaciones que permiten al estudiante aprender y conceptuar con mayor facilidad sobre un tema tan importante como lo es el de los recursos energéticos renovables y no renovables, abarcando temas tan importantes como la energía solar térmica, que es una posible solución a la crisis energética que se avecina. También, resalta la importancia que tiene la búsqueda de nuevas fuentes de energía que no degraden el medio ambiente.

  5. Energy expenditure after 2- to 3-hour elective surgical operations Gasto energético após 2 ou 3 horas de cirurgia eletiva

    Directory of Open Access Journals (Sweden)

    Andrea Ferreira Schuwartz Tannus

    2001-04-01

    Full Text Available Energy expenditure was measured by indirect calorimetry in 17 adult patients (8 women and 9 men before surgery, 4 hours immediately after surgery , and 24 hours late after surgery in patients undergoing elective surgery of small-to-medium scope. MATERIAL AND METHODS: The total duration of surgery ranged from 2 to 3 hours. Repeated measures were performed on the same patient, so that each patient was considered to be his/her own control. All patients received a 5% dextrose solution (2000 mL/day throughout the postoperative period. RESULTS: Men showed a reduction in CO2 production during the immediately after surgery period (257±42 mL/min compared to before surgery (306±48 mL/min and late after surgery (301±45 mL/min; this reduction was not observed in women. Energy expenditure was also lower in men during immediately after surgery (6.6 kJ/min. None of the other measurements, including substrate oxidation, showed significant differences. CONCLUSION: Therefore, elective surgery itself cannot be considered an important trauma that would result in increased energy expenditure. According to this study, it is not necessary to prescribe an energy supply exceeding basal expenditure during the immediate after-surgery period. The present results suggest that the energy supply prescribed during the postoperative period after elective surgery of small-to-medium scope should not exceed 5-7 kJ/min, so the patient does not receive a carbohydrate overload from energy supplementation.A resposta metabólica ao trauma cirúrgico ocorre imediatamente após a cirurgia e recomenda-se que a oferta calórica, nesta situação, seja igual ao metabolismo basal acrescido de 20-30%, considerado fator de injúria. No entanto, níveis elevados de glicemia e aumento na produção de CO2 são freqüentemente observados nestas ocasiões . OBJETIVO: O principal objetivo do presente estudo foi medir o gasto energético basal, o gasto energético imediatamente e 24 horas ap

  6. Electron energization in the geomagnetic tail current sheet

    International Nuclear Information System (INIS)

    Lyons, L.R.

    1984-01-01

    Electron motion in the distant tail current sheet is evaluated and found to violate the guiding center approximation at energies > or approx. =100 eV. Most electrons within the energy range approx.10 -1 -10 2 keV that enter the current sheet become trapped within the magnetic field reversal region. These electrons then convect earthward and gain energy from the cross-tail electric field. If the energy spectrum of electrons entering the current sheet is similar to that of electrons from the boundary layer surrounding the magnetotail, the energy gain from the electric field produces electron energy spectra comparable to those observed in the earth's plasma sheet. Thus current sheet interactions can be a significant source of particles and energy for plasma sheet electrons as well as for plasma sheet ions. A small fraction of electrons within the current sheet has its pitch angles scattered so as to be ejected from the current sheet within the atmospheric loss cone. These electrons can account for the electron precipitation near the high-latitude boundary of energetic electrons, which is approximately isotropic in pitch angle up to at least several hundred keV. Current sheet interaction should cause approximately isotropic auroral precipitation up to several hundred keV energies, which extends to significantly lower latitudes for ions than for electrons in agreement with low-altitude satellite observations. Electron precipitation associated with diffuse aurora generally has a transition at 1-10 keV to anisotropic pitch angle distributions. Such electron precipitation cannot be explained by current sheet interactions, but it can be explained by pitch angle diffusion driven by plasma turbulence

  7. La vulnerabilidad energética asociada a la movilidad motorizada

    Directory of Open Access Journals (Sweden)

    Ana Sanz Fernández

    2013-04-01

    Full Text Available ResumenEl concepto de vulnerabilidad energética describe la situación a la que se pueden enfrentar aquellos niveles de renta cuyo patrón de movilidad deje de ser económicamente viable por el incremento de los costes del petróleo. Teniendo en cuenta que la movilidad laboral es un gasto prioritario para evitar la exclusión social que supone la pérdida del empleo, el aumento de los gastos en esa partida presupuestaria familiar puede derivar en dos situaciones, ambas involuntarias, que serían la necesidad de destinar una mayor cantidad de recursos al transporte (pudiendo entonces aparecer privaciones en otras esferas o la obligación de cambiar los patrones de movilidad. El objetivo de esta investigación es desarrollar este concepto, ponerlo en relación con dos conceptos directamente vinculados, exclusión social vinculada al transporte y pobreza energética, y aplicar en el área metropolitana de Madrid la metodología desarrollada, detectando los de espacios urbanos energéticamente vulnerables y explicitando las relaciones de este fenómeno con la disciplina.Palabras claveVulnerabilidad energética, exclusión social vinculada al transporte, pobreza energética, pico del petróleo, área metropolitana.AbstractThe concept of energy vulnerability describes the situation that may face those income levels that have a mobility pattern which is no longer economically viable due to rising oil costs. Given that labor mobility is a priority spending to avoid social exclusion caused by job loss, increased expenses in that family budget can result in two situations, both involuntary, that would be the need for a greater amount of resources to transport (in that case, deprivation can then appear in other areas or the obligation to change mobility patterns. The objective of this research is todevelop this concept, put on two concepts directly related, transport related social exclusion and fuel poverty, and applied in the Madrid metropolitan area

  8. Investigación e impacto ambiental de los edificios. La energía

    Directory of Open Access Journals (Sweden)

    Rodríguez Aumente, Pedro A.

    2005-08-01

    Full Text Available This conference describes the main problems of energy use in face of the depleting of fosil resources, energy supply and emission of atmospheric toxic gases, green house effect gases and ozone depleting gases. The relevance of energy consumption in the environment impact is commented, as well as the key points for the posible evolution of the problem and in the appropriate technology research to cope with them In order to improve the energy and ecological efficiency of buidings. The main characteristics of present day technologies for the introduction of renewable energies in buidings are comented, dealing with their barriers for the widespread use. The most recent research on air conditioning using thermal solar energy with absorption machines is described, with application to Madrid.Se presenta la problemática actual del uso de la energía de cara al agotamiento de las fuentes fósiles, el abastecimiento y la contaminación atmosférica de gases tóxicos, de efecto invernadero y destructores de la capa de ozono. Se comenta la relevancia de la energía en el impacto ambiental de los edificios y se discuten los distintos aspectos que inciden en la posible evolución futura del problema y en la mejor estrategia de investigación tecnológica para tratar de mejorar la eficiencia energética y medioambiental de los edificios, especialmente en España. Se presentan las tecnologías actuales de introducción de las energías renovables en los edificios y se comentan sus más relevantes características, haciendo hincapié en las barreras para su difusión. Se describe la actividad más reciente de investigación en la climatización por energía solar haciendo uso de máquina de absorción, con aplicación a Madrid.

  9. Desarrollo metodológico a partir de mosaicos urbanos para evaluar la eficiencia energética y el aprovechamiento de la energía solar en el marco de la sustentabilidad urbana

    Directory of Open Access Journals (Sweden)

    Graciela Melisa Viegas

    Full Text Available En Argentina, la producción y reciclado de los edificios ha crecido significativamente en los últimos años, correspondiendo el mayor porcentaje a los residenciales. En este sentido es indispensable desarrollar herramientas analíticas que permitan comprender y monitorear los procesos involucrados en el fenómeno de la urbanización y cuantificar sus consecuencias energético-ambientales. El presente trabajo desarrolla una metodología que estudia, a partir de una unidad representativa (mosaico urbano, la aptitud de los distintos sectores de la ciudad para el aprovechamiento energético de la radiación solar en las diferentes texturas urbanas y sus áreas de disipación térmica, determinando el potencial energético de las mismas. Para ello se desarrolla: (a la definición conceptual de "mosaico urbano", su utilidad y su definición técnica; (b la evaluación de las herramientas para el procesamiento, la modelización espacial y energética de mosaicos; y (c un ejemplo de aplicación de la metodología. Los resultados verifican el desarrollo conceptual y la factibilidad de la metodología aplicable a un caso testigo de la ciudad de La Plata, Buenos Aires, Argentina (latitud 34°55 S; longitud 57°57 O, y permiten realizar estimaciones de la potencialidad para hacer eficiente el uso de la energía y aprovechar la energía solar (se obtuvo un 44,3% de ahorro de energía en calefacción.

  10. Estimativa das necessidades energéticas em pacientes com doença renal crônica

    Directory of Open Access Journals (Sweden)

    Juliana Cordeiro Dias Rodrigues

    2013-02-01

    Full Text Available Estabelecer as necessidades energéticas de pacientes com doença renal crônica é importante para que se possam tratar os distúrbios nutricionais encontrados nessa população. Segundo os guias de condutas voltados ao cuidado nutricional de pacientes com essa doença, a recomendação energética pode variar entre 30 e 40kcal/kg/dia. Contudo, trabalhos que avaliaram os componentes do gasto energético nos pacientes com doença renal crônica sugerem que as necessidades energéticas dessa população podem diferir do valor recomendado acima, a depender da condição clínica (presença de comorbidades, da modalidade de tratamento empregado e do nível de atividade física. Dessa forma, o presente trabalho tem como objetivo fazer uma revisão dos estudos sobre o gasto energético de pacientes com doença renal crônica, com o intuito de abordar as seguintes questões: (1 as atuais recomendações de energia para pacientes com doença renal crônica estão adequadas? (2 qual equação de predição poderia ser empregada para estimar as necessidades energéticas desse grupo de pacientes? Assim, esta revisão busca auxiliar o nutricionista ao estimar as necessidades energéticas de pacientes com doença renal crônica.

  11. Productividad y eficiencia energética en el proceso de molienda del mineral laterítico

    Directory of Open Access Journals (Sweden)

    Olga Angulo-Leblanch

    2000-03-01

    Full Text Available En el trabajo se realiza un análisis energético del proceso de molienda seca del mineral laterítico, considerado como el proceso de mayor consumo de energía eléctrica entre los procesos beneficiadores que se emplean en las plantas niquelíferas, ubicadas al norte de la provincia de Holguín. Son analizadas las particularidades energéticas que exhibe este proceso cuando las máquinas trabajan normalmente con la presencia de mineral y cuando se producen ausencias ocasionales de éste en el sistema, lo que trae como consecuencia el incremento notable de las potencias demandadas por los molinos y por los ventiladores de recirculación . Se analiza además, la influencia del grado de llenado con bolas del molino, sobre la productividad y la estrecha relación de esta última con la eficiencia energética del proceso. El método fundamental de análisis empleado, se basa en la obtención experimental y en las condiciones concretas de explotación, de las características energéticas de las unidades de molienda y de sus agregados, como vía directa para descubrir las reservas de energía del sistema y conocer hasta qué punto es posible mejorar su eficiencia influyendo sobre la productividad. El trabajo revela que, cuando las unidades de molienda son operadas con valores de productividades que oscilan entre un 50 y un 60% de la nominal, si son adoptadas las medidas pertinentes para lograr el aumento de la productividad, entonces esto puede reportar hasta un 55% de mejoramiento de la eficiencia energética del proceso.

  12. Constructing polyatomic potential energy surfaces by interpolating diabatic Hamiltonian matrices with demonstration on green fluorescent protein chromophore

    Energy Technology Data Exchange (ETDEWEB)

    Park, Jae Woo; Rhee, Young Min, E-mail: ymrhee@postech.ac.kr [Center for Self-assembly and Complexity, Institute for Basic Science (IBS), Pohang 790-784 (Korea, Republic of); Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784 (Korea, Republic of)

    2014-04-28

    Simulating molecular dynamics directly on quantum chemically obtained potential energy surfaces is generally time consuming. The cost becomes overwhelming especially when excited state dynamics is aimed with multiple electronic states. The interpolated potential has been suggested as a remedy for the cost issue in various simulation settings ranging from fast gas phase reactions of small molecules to relatively slow condensed phase dynamics with complex surrounding. Here, we present a scheme for interpolating multiple electronic surfaces of a relatively large molecule, with an intention of applying it to studying nonadiabatic behaviors. The scheme starts with adiabatic potential information and its diabatic transformation, both of which can be readily obtained, in principle, with quantum chemical calculations. The adiabatic energies and their derivatives on each interpolation center are combined with the derivative coupling vectors to generate the corresponding diabatic Hamiltonian and its derivatives, and they are subsequently adopted in producing a globally defined diabatic Hamiltonian function. As a demonstration, we employ the scheme to build an interpolated Hamiltonian of a relatively large chromophore, para-hydroxybenzylidene imidazolinone, in reference to its all-atom analytical surface model. We show that the interpolation is indeed reliable enough to reproduce important features of the reference surface model, such as its adiabatic energies and derivative couplings. In addition, nonadiabatic surface hopping simulations with interpolation yield population transfer dynamics that is well in accord with the result generated with the reference analytic surface. With these, we conclude by suggesting that the interpolation of diabatic Hamiltonians will be applicable for studying nonadiabatic behaviors of sizeable molecules.

  13. Interrogating the vibrational relaxation of highly excited polyatomics with time-resolved diode laser spectroscopy: C6H6, C6D6, and C6F6+CO2

    International Nuclear Information System (INIS)

    Sedlacek, A.J.; Weston, R.E. Jr.; Flynn, G.W.

    1991-01-01

    The vibrational relaxation of highly excited ground state benzene, benzene d 6 , and hexafluorobenzene by CO 2 has been investigated with high resolution diode laser spectroscopy. The vibrationally hot polyatomics are formed by single photon 248 nm excitation to the S 1 state followed by rapid radiationless transitions. It has been found that in all cases less than 1% of the energy initially present in the polyatomics is deposited into the high frequency mode of CO 2 (ν 3 ). An investigation of the CO 2 (00 0 1) nascent rotational distribution under single collision conditions reveals that very little rotational excitation accompanies vibrational energy transfer to the ν 3 mode. The CO 2 (ν 3 ) rotational states can be described by temperatures, T rot , as follows: C 6 H 6 , T rot =360±30 K; C 6 D 6 , T rot =350±35 K and C 6 F 6 , T rot =340±23 K. An estimate of left-angle ΔE right-angle ν3 , the mean energy transferred to the CO 2 ν 3 mode per collision, suggests that as the availability of low frequency modes in the excited molecule increases, less energy is deposited into the high frequency mode of CO 2 . Finally, evidence is presented suggesting that even at moderate laser fluences, the two-photon ionization of benzene can lead to substantial CO 2 ν 3 excitation via electron+CO 2 inelastic collisions

  14. Una solución al problema de la energía y de la contaminación en México

    Directory of Open Access Journals (Sweden)

    Dieter Klaus

    1975-01-01

    Full Text Available La crisis energética ha demostrado mundialmente que nuestro concepto de "energía" es insostenible. se necesitan tres unidades caloríficas provenientes del petróleo o el carbón para producir una unidad de energía eléctrica superior. Menos favorable es el aprovechamiento en la conversión del combustible en movimiento de nuestros vehículos. La obtención de energía proveniente del aceite crudo es irreversible.

  15. Avaliação do desempenho energético de um grande edifício de serviços existente

    OpenAIRE

    Garrido, Diogo Emanuel da Silva

    2013-01-01

    Nesta dissertação pretende-se caracterizar o desempenho energético de um grande edifício de serviços existente, da tipologia ensino, avaliar e identificar potenciais medidas que melhorem aquele desempenho, permitindo, em complemento, determinar a sua classificação energética no âmbito da legislação vigente. A pertinência do estudo prende-se com a avaliação do desempenho energético dos edifícios e com o estudo de medidas de melhoria que permitam incrementar a eficiência energéti...

  16. Perspectivas de la situación energética mundial. Las oportunidades para Colombia

    Directory of Open Access Journals (Sweden)

    Arturo Infante Villarreal

    2007-05-01

    Full Text Available Casi la cuarta parte de la energía que consume Estados Unidos proviene de petróleo importado y sólo el 6% se origina en fuentes renovables, aunque el país produce 20% de la polución ambiental mundial y tiene sólo 4% de la población total. Los biocombustibles son una fuente potencial de energía renovable para Estados Unidos, y el resto del mundo, porque tienen un balance energético y ambiental bastante favorable. Si las condiciones de precios son adecuadas para los productores de las materias primas, los biocombustibles también tienen un impacto social importante. Colombia tiene posibilidades de participar en los mercados nacionales e internacionales de los biocombustibles sustitutos, tanto de la gasolina como del diesel con etanol y biodiesel, respectivamente. La palma de aceite, la caña de azúcar y la yuca constituyen las materias primas con mayor potencial./ Almost one fourth of the energy consumed in the U.S. comes from imported oil and only 6% is produced from renewable sources despite the fact that the U.S. is responsible for 20% of the global pollution with barely 4% of the world population. Biofuels are a promising source of renewable energy for the United States and the rest of the world, with favorable energy and environmental balances. If price conditions are adequate for the basic input producers, biofuels will have an important social impact, as well. Colombia has the possibility to participate in the national and international biofuel substitution markets for gasoline and diesel with ethanol and biodiesel, respectively. Oil Palm, Sugar Cane and Yuca, are the raw materials with the best potential.

  17. Celdas combustibles: una opción para la transformación descentralizada de energía

    Directory of Open Access Journals (Sweden)

    Julio Alberto Gavilán Yodú

    2011-02-01

    Full Text Available La solución a los problemas energéticos actuales y al progresivo deterioro del medio ambiente está estrechamenterelacionada con la elección de sistemas energéticos alternativos que sean capaces de garantizar el desarrollosostenible de todos los países. La producción descentralizada de energía, fundamentada con acierto por losdefensores del denominado camino energético suave o el camino del Sol, permite la transformación de energíacon tecnologías preferentemente no contaminantes en el lugar de consumo. Con esto se reducirían de modoconsiderable las pérdidas energéticas ocasionadas por los procesos de transmisión y distribución. La celdacombustible constituye la tecnología de mayor potencial para revolucionar el panorama energético en este siglo.Como transformador electroquímico, la conversión energética máxima posible se define por la energía libre dereacción en un régimen de temperatura relativamente bajo. En este trabajo se realiza un análisis de los diferentestipos de celdas combustibles y se caracteriza el estado actual de esta tecnología. Además, se analiza el usodel hidrógeno solar en celdas combustibles.  The solution to the actual energy problems and to the progressive damage of the environment is closely relatedwith the election of alternative energy systems that it be able to guarantee the sustainable development of all thecountries. The decentralized energy production, based with success by the defenders of the one denominatedsoft energy way or Sun way, allows the energy transformation with technologies preferably not pollutants in theplace of  consumption. It would decrease in a considerable way the energy losses caused by the transmissionprocesses and distribution. The fuel cell constitutes the technology of more potential to revolutionize the energypanorama in this century. As electrochemical transformer, the possible maximum energy conversion is definedfor the free energy of reaction in a relatively

  18. Implementación multimedia sobre energía fotovoltaica

    OpenAIRE

    Álvarez Santos, Alejandro; Giménez Oró, Nèstor

    2004-01-01

    El presente proyecto consiste en un programa informático que explica qué es la energía fotovoltaica, qué componentes tecnológicos se utilizan para su obtención y qué cálculos previos son necesarios para realizar la implementación de un campo de paneles solares. La herramienta elegida para realizar el programa informático, ha sido Macromedia Flash MX, versión 6.

  19. Back-to-Back Energization of a 60kV Cable Network - Inrush Currents Phenomenon

    DEFF Research Database (Denmark)

    Faria da Silva, Filipe; Bak, Claus Leth; Hansen, M. Lind

    2010-01-01

    On November 2008 the Danish government decided that all Danish transmission lines with a rated voltage equal to and below 150kV must be put underground, in order to reduce the visual pollution caused by Overhead Lines. This decision will lead to a massive use of underground cables in the Danish...... Network, and force a change in the approach used until now when planning, analyzing and operating electrical power systems. One problem that might arise is the energization of cables in parallel, as this operation may originate high inrush currents, which represent a risk to the circuit breakers connected...

  20. Microprocessor-controlled tester for evaluation of the Self-Energized Credential System (SECS)

    International Nuclear Information System (INIS)

    Corlis, N.E.

    1980-03-01

    The Self-Energized Credential System (SECS) was developed for use in the Plutonium Protection System (PPS) installed at Hanford, Washington. Evaluation and development of the SECS system was enhanced by the use of a microprocessor-controlled portal tester. This tester used infrared (ir) beam sensors to provide information on the direction of travel of the credential wearer and to detect inoperative credentials. A printed record of the portal number, actual code read, time, and direction of the credential passage provided information essential to an assessment of the operability of the SECS

  1. Almacenamiento de energía mediante aire comprimido: Plantas CAES.

    OpenAIRE

    Muñoz Diez de la Cortina, Alejandro

    2015-01-01

    El presente proyecto estudia el estado del arte en cuanto a tecnología CAES se refiere, en un intento de compilación de la información disponible en distintos medios de divulgación científica e ingenieril, y haciendo una presentación de las distintas mejoras y desarrollos posibles de la tecnología así como de un acercamiento a las dos plantas ya existentes que utilizan este medio de almacenamiento de energía. El núcleo del proyecto se encuentra en el estudio de los sistemas ...

  2. La situación energética en el Pacto Andino

    OpenAIRE

    Centro de Estudios Sudamericanos

    2008-01-01

    Los países de la región han venido modernizando sus sectores energéticos y han adoptado enfoques similares en cuanto a objetivos generales como la búsqueda de la eficiencia mediante mecanismos de mercado donde ello sea posible; la tendencia al alejamiento del Estado de actividades puramente empresariales y su focalización en los temas de regulación y control; la puesta en marcha de políticas transparentes que promuevan la competencia; y la participación de inversionistas privados, etc. No obs...

  3. Coste energético del dribling en hockey sobre patines

    OpenAIRE

    Blanco, Dr. Alfonso; Balagué, Dra. Natàlia

    1997-01-01

    El objetivo del presente estudio ha sido analizar y comparar el coste energético del dribling en hockey sobre patines con respecto a la acción de patinar. Doce jugadores amateurs bien entrenados han realizado, durante cinco minutos a 11, 13 y 15 km/h, patinaje solamente y patinaje mientras driblaban la bola con el stick. En ambos casos se evaluaron directamente y compararon consumo de oxígeno, ventilación, frecuencia cardíaca y nivel de percepción subjetiva del esfuerzo. Las variables fisioló...

  4. Modeling the Energization and Eruption of Flux Ropes and Sheared Arcades

    Science.gov (United States)

    Linton, Mark G.

    2016-10-01

    Solar magnetic eruptions are dramatic sources of solar activity, and dangerous sources of space weather hazards. Observations of the solar photosphere and overlying atmosphere by the Solar Dynamics Observatory have given us new views, measurements, and modeling constraints for understanding these eruptions. This presentation will review the current state of the art in modeling the energization and eruption of sheared magnetic arcades and of magnetic flux ropes in the corona, and will review the critical role that observations play in the motivation, development, and application of these models.

  5. La Insostenibilidad energética del "Gran Dragón" : China 1985-2009

    OpenAIRE

    Ramos Martín, Jesús

    2012-01-01

    China ya no es solo la principal fábrica del mundo, con el consiguiente nivel de consumo de recursos naturales (energía y materiales) y de emisiones de contaminantes, sino que se ha convertido en uno de los principales acreedores mundiales, y como tal, en garante del crecimiento de la mayoría de las economías occidentales. La insostenibilidad del modelo de crecimiento chino, basado en una copia de los países occidentales, se hace más evidente desde la crisis de oferta de petróleo que sacudió ...

  6. Iluminación con Energía Solar Fotovoltaica para Autoservicios en Bogotá

    Directory of Open Access Journals (Sweden)

    Wilmar Giovani Santamaría

    2015-07-01

    Full Text Available Este artículo presenta un estudio técnico y económico sobre el uso de energía fotovoltaica para iluminación en dos (2 autoservicios en la ciudad de Bogotá. Se analizan diferentes aspectos a tener en cuenta, como la radiación solar mínima sobre el área considerada y los consumos en iluminación con energía convencional. Se estima que, al realizar el cambio de iluminación de bombillos fluorescentes a bombillos LED y establecer como fuente primaria las baterías previamente alimentadas con energía fotovoltaica, se reduce el consumo de energía eléctrica de manera considerable en iluminación. Con esta hipótesis, se plantean tres opciones de sistemas fotovoltaicos autónomos para cada uno de los autoservicios con todos los elementos necesarios para el mejor funcionamiento, el estudio económico de cada opción y un estimativo del ahorro energético.

  7. El papel de la energía renovable en la competitividad un bosquejo de México

    Directory of Open Access Journals (Sweden)

    Laura Leticia Laurent Martínez

    2016-03-01

    Full Text Available La relación entre la energía y el desarrollo parece incuestionable. Entre más energía y más requerimientos tecnológicos haya que poner en juego para producirla, más avanzados se consideran los países. Sin embargo, los criterios están cambiando aceleradamente, aunque sin las repercusiones esperadas por los defensores de la competitividad. En este artículo se presenta un panorama global del bienestar de los seres vivos mediante la sustitución de las energías provenientes de los fósiles y de la fisión nuclear por energía renovable (er. Se prosigue con una serie de argumentaciones sobre el papel que desempeñan las energías renovables en la competitividad sustentable en relación con la competitividad efímera. Finalizamos con una breve descripción de la posición de México en el renglón de la er, la cual ofrece un marco para una reflexión crítica de las restricciones de la sustentabilidad en México

  8. Investigation of Prevalence of Energizer Drugs and Supplements Consumption and Effective Factors Among Bodybuilder Men in Karaj (2011

    Directory of Open Access Journals (Sweden)

    F. Shoshtarizadeh

    2013-08-01

    Full Text Available Background: Body builder athletes’ high attention to form of body can result in high prevalence of nutritional disorders and habit to energizer drugs consumption. With notice to abuse problems of these drugs, this research was carried out to estimate prevalence of energizer drugs and supplements consumption in Karaj body builder men in 2011. Method: In cross-sectional (description- analytical research 780 Karaj body builder men were selected randomly. Data were collected through interview with questionnaires containing demographic questions and using information of drugs. Data were analyzed with SPSS software (Ver. 19 and κ² test with meaningful level of P<0.05. Result: Prevalence of consumption in studied sample from different types of supplements and energizer drugs was estimated 88.2%. The most consumption prevalence belonged to food supplements and vitamins group and combination of those (69.9%. About anabolic and energizer compounds and also hormonal drugs and corticosteroids, prevalence was 5.6% and 2.1% respectively and 7.7% totally. There was meaningful relation between experience times of abuse problems, place of drug and supplement supply and attention to being permissible or impermissible of those items with type of drugs or supplement (P = 0.001. Also relation between consumption of supplements and drugs with main goal in using them was meaningful (P = 0.045. Conclusion: Consumption of supplement and energizer drugs in Karaj body builder men has high prevalence.

  9. Importancia de la energía para el crecimiento económico de México

    Directory of Open Access Journals (Sweden)

    Flory A. Dieck Assad

    2014-01-01

    Full Text Available Esta investigación analiza la productividad agregada de la mano de obra y del capital en México entre los años 1993 y 2013, con el fin de identificar las variables que influyen en su comportamiento, especialmente la energía. Esto se lleva a cabo mediante una función de producción agregada que logra identificar la influencia del acervo utilizado de capital, el trabajo remunerado, los cambios tecnológicos y la energía sobre la productividad agregada real promedio de la mano de obra y el capital y, por ende, del crecimiento potencial del PIB (producto interno bruto. Asimismo, se introduce el tema de precios de la energía, identificando su impacto directo en el uso de energía y el indirecto en la productividad y el crecimiento económico. Este análisis culmina con la definición de las perspectivas de la Reforma energética a la luz de los resultados de esta investigación, vislumbrando los desafíos y retos futuros.

  10. Avaliação energética de um sistema integrado de abastecimento de água

    Directory of Open Access Journals (Sweden)

    Ana Luiza Rezende Guanais

    2017-07-01

    Full Text Available RESUMO Os encargos energéticos decorrentes do Sistema Integrado de Abastecimento de Água de Feira de Santana (SIAA-FSA foram analisados utilizando o método de avaliação do ciclo de vida. Foram identificadas, na cadeia de abastecimento de água, as etapas do sistema com maiores encargos energéticos, e propostos cenários de melhoria. Cadeias de produção dos insumos químicos, transporte dos insumos, energia elétrica e substituição dos tubos na rede para a manutenção do SIAA-FSA foram consideradas. A demanda energética acumulada do SIAA-FSA foi de 3,51 kWh.m-3 de água consumida. As etapas de captação e distribuição de água apresentaram os maiores consumos energéticos, e a eletricidade do bombeamento representou 86% da demanda energética acumulada. Os cenários propostos para o SIAA-FSA apresentaram melhorias significativas em relação ao cenário atual, com usos mais racionais de insumos químicos, eletricidade e água.

  11. Estimación del potencial de energías renovables en el estado de Sonora

    Directory of Open Access Journals (Sweden)

    Jorge Luis Taddei Bringas

    2016-06-01

    Full Text Available La etapa de uso de combustibles fósiles está llegando a su fin, debido principalmente a la escasez y problemas de contaminación que originan. En la actualidad existe una marcada tendencia en aprovechar las fuentes renovables de energía, por su bajo impacto ambiental y menor emisión de gases de efecto invernadero (GEI, lo cual contribuye a independizar las políticas energéticas locales de las del mercado global, basadas en la supremacía petrolera. Para obtener el mayor provecho de las energías renovables, es importante determinar el potencial de los distintos recursos energéticos existentes en una región. En este trabajo se presenta una relación del potencial para explotar energías renovables en el estado de Sonora, México, como un paso previo para establecer acciones y políticas que busquen su posible utilización a gran escala.

  12. Energizing change

    International Nuclear Information System (INIS)

    El-Ashry, M.T.

    1998-01-01

    Since its creation in 1991, the Global Environment Facility (GEF) has committed over US D 725 million to nearly 200 projects in 49 nations in concrete action to combat climate changes. Its activities are implemented by the United Nations Environmental Programme, the United Nations Development Programme and the World Bank. This paper describes the GEF's work to combat climatic changes

  13. Análise dos impactos energéticos e econômicos do programa brasileiro de etiquetagem energética (PBE/Inmetro em coletores solares térmicos do Brasil

    Directory of Open Access Journals (Sweden)

    João Pedro Stefano Marchesini Fonseca

    2018-01-01

    Full Text Available O presente estudo avalia os impactos energéticos e econômicos do uso de coletores solares térmicos planos fechados, típicos do setor residencial, nas diferentes regiões geográficas do Brasil, considerando as classes de eficiência energética do Programa Brasileiro de Etiquetagem Energética – PBE/INMETRO. As avaliações energéticas mostraram que todas as classes de coletores solares, de A (mais eficiente a E (menos eficiente, apresentam significativos ganhos energéticos, em substituição aos chuveiros elétricos. Foi definida uma cidade representativa para cada região geográfica do país, bem como sua temperatura média ambiente e nível de radiação mensal, o volume diário de água do banho a ser aquecida pelo sistema e o chuveiro elétrico e também a área média de painel solar para cada residência. Posteriormente, foram coletadas as informações de custos dos modelos representativos em relação as classes de eficiência energética, bem como taxa de juros e tarifas de energia elétrica e, assim, foram calculadas as frações solares anuais. As análises econômicas, utilizando a ferramenta de Benefício Anual Líquido – BAL, mostraram que nem sempre é viável o consumidor residencial utilizar equipamentos mais eficientes, classe A (com o Selo PROCEL.

  14. A time-energy analysis of daytime surface activity in degus, Octodon degus Análisis del uso de tiempo y energía en la actividad superficial diaria en degus, Octodon degus

    Directory of Open Access Journals (Sweden)

    G.J. Kenagy

    2002-03-01

    Full Text Available We present an analysis of time and energy allocation in a day-active caviomorph rodent, the degu, Octodon degus, in central Chile. We quantified components of surface activity in the field on a daily basis in individual degus near the time of the summer solstice, when conditions of heat and aridity were also at a seasonal extreme, in order to answer the following questions. Does the absolute time available for surface activity limit performance? Does the allocation of time and energy for locomotion place a functionally significant limitation on overall energy balance and performance? Degus spent about 2/3 of their above-ground time foraging; they remained stationary about 88 % of the time, walked around slowly about 10 %, and were running rapidly from one point to another only about 2 % of the time. Net locomotion costs (for walking and running combined were computed to be only 2.2 % of total daily energy expenditure. This low net allocation of time and energy to locomotion, taken together with abundant distribution of plant food over the extremely small home range, suggests that the daily performance of degus is not limited by the absolute amount of time available under normal conditions at the summer solstice (seasonal extreme of day length, heat, and aridity. Total energy demands can be met by as little as 4.5 h surface activity per day. Our empirical observations, together with a simple computational model of time and energy expenditure, provide a useful validation of the impact of activity on the overall energy balance of a free-living rodent. The small impact of locomotion on the total energy budget is an economy of the behavior of these animals, and the rapid mode of locomotion allows them to minimize predation risks. We believe that this kind of quantitative analysis of energy expenditure associated with behavior in the field can contribute a useful basis for theoretically based time-energy modelingPresentamos un análisis de la asignaci

  15. Consideraciones para la adopción de energía nucleoeléctrica a la matriz energética del Ecuador e interconexión a Colombia y Perú

    OpenAIRE

    Amancha Proaño, Pablo Israel

    2014-01-01

    El consumo mundial de energía eléctrica ha tenido un considerable crecimiento, con mayor penetración de tecnologías fósiles, aumentando las concentraciones globales de CO2 y CH4, que exceden valores medios de los últimos milenios, lo cual provocará problemas en el clima global. Urge adoptar tecnologías sustentables en diferentes países y sectores. Ecuador, Perú y Colombia, con tasas similares de crecimiento en lo económico y energético, han visto en la hidroenergía su principal fuente de gene...

  16. La imagen electrónica de la energía. Estudio estético y funcional de las páginas webs de las compañías del sector energético

    OpenAIRE

    Álvarez Ruiz, Antón; Reyes Moreno, María Isabel

    2011-01-01

    Este artículo analiza las páginas webs de las principales compañías operantes en el sector de la energía (electricidad y gas) de los países más desarrollados. La situación actual del mercado es muy significativa. Por primera vez en la historia, las administraciones centrales de estos países han consentido liberalizar el mercado energético. Y, aunque este proceso avanza con gran lentitud, comienzan a notarse cambios que anticipan un proceso de concentración, a través de compras, fusiones y ...

  17. Análisis de alternativas tecnológicas y energéticas para el sistema metroplús bajo una evaluación integrada energía, ambiente, economía

    OpenAIRE

    Alzate, Juan M; Builes, Luis A; Rave, Claudia C.; Smith, Ricardo A.; Cadena, Ángela I.

    2008-01-01

    Con un modelo de optimización multi­periodo, basado en programación lineal, y de tipo integrado Energía­Ambiente­Economía (MARKAL­Estándar), se estimaron impactos económicos, energéticos y ambientales de cinco alternativas tecnológicas para la flota de buses que atenderá la demanda de movilidad del sistema de transporte masivo de pasajeros, de mediana capacidad, del Área Metropolitana del Valle de Aburrá (Medellín – Colombia) ­Sistema Metroplús­. Las alternativa...

  18. Modelo de cooperación energética entre China y América Latina

    OpenAIRE

    Hongbo, Sun

    2014-01-01

    Las relaciones entre China y América Latina han tenido más implicaciones estratégicas en la actual transición de poder político y económico internacional, en particular, sus vínculos energéticos han sido testigos de grandes avances de cooperación entre industrias de petróleo y gas. La cooperación energética de China con América Latina se compone, en una parte nada despreciable, de cambios en curso en energía en el occidente del hemisferio. Las compañías petroleras chinas recurren a diferentes...

  19. El sub-sector de distribución de energía eléctrica en Colombia

    Directory of Open Access Journals (Sweden)

    Mauricio Martín Delvasto

    1999-07-01

    Full Text Available El sector de energía eléctrica en Colombia, ha experimentado en los últimos 18 meses una transformación total que persigue la utilización eficiente de los recursos, además de tener el control administrativo y operacional de las empresas de generación y distribución de energía con el propósito de lograr mayor cobertura nacional y aumentar considerablemente la calidad en la prestación del servicio de energía. A continuación se describen los principales elementos, incluyendo aquellos de naturaleza financiera, que originaron su transformación, así como los resultados, a corto y mediano plazo que se pretenden obtener con los procesos de privatización de un sector, sin ninguna duda, fundamental para el desarrollo de nuestro país.

  20. Model of taking of decisions for energization of isolated areas not interconnected

    International Nuclear Information System (INIS)

    Smith, Ricardo; Jaramillo, Patricia; Angel, William; Henao, Felipe

    2003-01-01

    In the word, particularly in developing countries, a big part of the population lives in isolated areas, which are, in most of the cases, poor. That is why governments and NGOs, make efforts to formulate policies, plans and programs in order to improve the quality of life and promote the economic development in those regions. However, most of those programs are not successful. One of the main causing factors of this problem is the decision maker's lack of proper methodologies that support them in the decision process. In this context, we propose some methodologies based in a multicriteria decision theory in order to solve two basic related problems: the first one is how to choose the most suitable and satisfactory technology for supply energy to an isolated area; the second one is how to order by priority a set of communities that are consider in a national or regional energization plan. The proposed patterns allow handling with problems where the consideration o many objectives and many decision makers in the process are necessary and with problems where part of the information is unknown or not precisely defined. With these methodologies, the responsible governmental entities in charge of the energization of a country would make less subjective energy plans with better solutions in terms of social, economic, environmental and technologic aspects

  1. Model of taking of decisions for energization of isolated areas not interconnected

    International Nuclear Information System (INIS)

    Smith, Ricardo; Jaramillo, Patricia; Angel William; Henao, Felipe

    2003-01-01

    In the word, particularly in developing countries, a big part of the population lives in isolated areas, which are, in most of the cases, poor. That is why governments and NGO make efforts to formulate policies, plans and programs in order to improve the quality of life and promote the economic development in those regions. However, most of those programs are not successful. One of the main causing factors of this problem is the decision maker's lack of proper methodologies that support them in the decision process. In this context, we propose some methodologies based in a multicriteria decision theory in order to solve two basic related problems: the first one is how to choose the most suitable and satisfactory technology for supply energy to an isolated area; the second one is how to order by priority a set of communities that are consider in a national or regional energization plan. The proposed patterns allow handling with problems where the consideration of many objectives and many decision makers in the process are necessary and with problems where part of the information is unknown or not precisely defined. With these methodologies, the responsible governmental entities - in charge of the energization of a country would make less subjective energy plans with better solutions in terms of social, economic, environmental and technologic aspects

  2. Energized CO{sub 2} dry ice blast cleaning firmly grounded in the Canadian electrical industry

    Energy Technology Data Exchange (ETDEWEB)

    Lindsay, K.

    1999-02-01

    Development and use of energized carbon dioxide dry ice blast technology for cleaning electrical distribution system components by Oakville Hydro and Milton Hydro (both in Ontario) is discussed. The technology was developed by Alpheus Cleaning Technologies of California and Puget Sound Power and Light Company after a two-year study that commenced in 1991, and has been supplied in Canada by Wickens Industrial Ltd., since 1993 for cleaning various industrial and non-energized electrical applications in the automotive, printing , food processing and other manufacturing industries and hydro generating facilities. The unique cleaning dynamics of this technology allow for the removal of contaminants that are much more stubborn than those encountered in pad-mounted switchgear and other electrical apparatus. Dry ice pellets, by expanding to 400 times their solid state on impact, create a flushing action that helps to remove contaminants. No grit or solvents are required and the process is non-toxic. In using the process workers wear fire retardant clothing, 40 kV-Class 4 rubber gloves and full face shields. Dielectric tests are performed routinely to confirm the dielectric integrity of the spray wand components. A two stage inspection/trouble report is completed on every job. Use of this technology eliminates power interruptions to customers, improves system reliability and safety, reduces cleaning time to a minimum, and eliminated the need for reclamation of grit or solvent containment.

  3. Diseño integrado para viviendas energéticamente eficientes en Chile: Enhebrando capacidades

    Directory of Open Access Journals (Sweden)

    Underlea Miotto Bruscato

    2011-12-01

    Full Text Available El diseño integrado es una estrategia para desarrollar proyectos de arquitectura sustentable, incorporando trabajo multidisciplinario y evaluaciones de desempeño, que ha demostrado ser un aporte relevante en la ejecución de edificios públicos de países desarrollados. Este artículo presenta la revisión de aspectos de diseño integrado para la elaboración de viviendas energéticamente eficientes en la zona sur de Chile, destinadas en particular a la reconstrucción post terremoto del 27 de Febrero del 2010. Realizando primeramente una síntesis de características de los procesos de diseño integrado, sus condiciones implícitas, participantes, etapas, recursos y resultados esperados según referencias internacionales. Luego se contrasta con la práctica regular de diseño de viviendas en Chile según la regulación vigente y entrevistas a profesionales. Posteriormente se analizan procesos de diseños de casas experimentales y conjuntos habitacionales particularmente enfocados al desempeño energético, realizando seguimientos y entrevistas para revisar aspectos significativos. Identificando algunas consideraciones y recursos relevantes aplicados en el diseño de las viviendas que permitieron el logro de mejoramientos ambientales.

  4. The contribution of inductive electric fields to particle energization in the inner magnetosphere

    Science.gov (United States)

    Ilie, R.; Toth, G.; Liemohn, M. W.; Chan, A. A.

    2017-12-01

    Assessing the relative contribution of potential versus inductive electric fields at the energization of the hot ion population in the inner magnetosphere is only possible by thorough examination of the time varying magnetic field and current systems using global modeling of the entire system. We present here a method to calculate the inductive and potential components of electric field in the entire magnetosphere region. This method is based on the Helmholtz vector decomposition of the motional electric field as calculated by the BATS-R-US model, and is subject to boundary conditions. This approach removes the need to trace independent field lines and lifts the assumption that the magnetic field lines can be treated as frozen in a stationary ionosphere. In order to quantify the relative contributions of potential and inductive electric fields at driving plasma sheet ions into the inner magnetosphere, we apply this method for the March 17th, 2013 geomagnetic storm. We present here the consequences of slow continuous changes in the geomagnetic field as well as the strong tail dipolarizations on the distortion of the near-Earth magnetic field and current systems. Our findings indicate that the inductive component of the electric field is comparable, and even higher at times than the potential component, suggesting that the electric field induced by the time varying magnetic field plays a crucial role in the overall particle energization in the inner magnetosphere.

  5. Energization of electrons in a plasma beam entering a curved magnetic field

    International Nuclear Information System (INIS)

    Brenning, N.; Lindberg, L.; Eriksson, A.

    1980-09-01

    Earlier experiments have indicated that suprathermal electrons appear when a collisionless plasma flowing along a magnetic field enters a region where the magnetic field is curved. In the present investigation newly developed methods of He-spectroscopy based on the absolute intensities of the He I 3889 A and He II 4686 A lines are utilized to study the electron temperature and to estimate the population of non-thermal electrons. The density of helium added for the diagnostic purpose is so low that the flow is not disturbed. It is found that the intrusion of the plasma into a curved or transverse field gives rise to a slight increase (15-20%) in the electron temperature and a remarkable increase in the fraction of non-thermal (>100 eV) electrons from below 1% to as much as 20-25% of the total electron population. There are also indications that the energization of electrons is particularly efficient on that side of the plasma beam which becomes polarized to a positive potential when entering the curved field. The experiments are confined to the case of weak magnetic field, i.e. only the electrons are magnetically confined. New details of the electric field and potential structure are presented and discussed. Electric field components parallel to the magnetic field are likely to energize the electrons, probably through the run-away phenomenon. (Auth.)

  6. Energía eólica en España

    Directory of Open Access Journals (Sweden)

    Cayetano Espejo Marín

    2004-01-01

    Full Text Available Desde mediados de los años noventa se ha producido en España una expansiónextraordinaria del aprovechamiento de la energía eólica para la generación de electrici-dad. La disponibilidad de zonas con potencial eólico estimable junto con las políticas deapoyo a las energías renovables, sobre todo a la eólica, han contribuido a un enormedesarrollo industrial y tecnológico de este sector. España es líder mundial, tanto enpotencia instalada, donde ocupa el tercer puesto detrás de Alemania y Estados Unidos,como en número y volumen de empresas que participan en los distintos ámbitos de laenergía eólica. En este artículo se analizan las características del sector eólico español.

  7. Electrostatic precipitators for coal thermal power plants energized by means of narrow pulse voltage

    Energy Technology Data Exchange (ETDEWEB)

    Dinelli, G.; Mattachini, F.; Bogani, V.; Baldacci, A.; Tarli, R. (ENEL-CRTN, Direzione Studi e Ricerche, Milan (Italy) ENEL, VDT Settore Tecnico, Direzione Produzione e Trasmissione, Rome (Italy))

    1990-09-01

    The efficiency of electrostatic precipitators, widely used in thermal power plants to clean flue gases from solid particulate, is strongly dependent both on the way particles are electrically charged and on the characteristics of the electric field within the interelectrodic space of the precipitator. Such operating may become inadequate under varying particle characteristics and operating conditions of the thermal plant, therefore bringing to a reduction in the precipitator collection efficiency. An innovative technique, by generating a pulsed corona in the precipitator, allows a substantial improvement of both the particle charging and the collection processes and an increase in the operation flexibility of the electrostatic precipitator. The narrow pulse voltage energization has been extensively tested at a coal thermal unit having the electrostatic precipitators equipped with both conventional and pulse power sets. The long duration tests confirmed the following results: 1) high reliability of the pulse power sets and a considerable improvement in the precipitator collection efficiency; 2) a decrease in the particulate emissions, with coals whose ashes are of difficult collection, ranging between 75% and 85% of those with conventional energization; 3) a reduction by a factor of about 5 in the consumption of electric power by the electrostatic precipitation process.

  8. Melhoria da eficiência energética em sistemas motrizes industriais

    Directory of Open Access Journals (Sweden)

    Antonio Vanderley Herrero Sola

    2015-09-01

    Full Text Available A comunidade científica internacional tem considerado o uso eficiente de energia em sistemas de produção extremamente importante para o desenvolvimento sustentável. Este artigo estuda a melhoria da eficiência energética em sistemas motrizes industriais por meio de mudança tecnológica. Inicialmente é feita uma revisão de literatura para apresentar as principais ações e barreiras para a melhoria da eficiência energética em sistemas industriais de energia e também destacar o uso de uma abordagem multicritério em caso de mudança tecnológica. O artigo apresenta um estudo de caso em uma indústria com o objetivo de ordenar motores elétricos para serem substituídos utilizando o método multicritério PROMETHEE II. O estudo revela que a escolha dos critérios pode alterar a ordem de prioridade de escolha das tecnologias a serem substituídas, com impacto no desempenho das novas tecnologias. O artigo enfatiza a importância da integração de todas as áreas da empresa para que sejam atendidos os interesses da organização.

  9. Consumo de energía y nutrimentos en mujeres mexicanas en edad reproductiva

    Directory of Open Access Journals (Sweden)

    FLORES MARIO

    1998-01-01

    Full Text Available Objetivo. Analizar el consumo de energía y nutrimentos de mujeres mexicanas de 12 a 49 años de edad. Material y métodos. La información dietética se obtuvo por recordatorio de 24 horas en 9 101 mujeres participantes en la Encuesta Nacional de Nutrición de 1988 y se contrastó con características sociodemográficas y estado fisiológico. El consumo de nutrimentos se comparó con las recomendaciones de ingestión dietética (RID. Resultados. La mediana del consumo energético fue de 1 568 kcal/día. La dieta estuvo conformada por 15% de proteína, 60% de hidratos de carbono y 25% de grasa. La proporción de mujeres con una ingestión inferior a la mitad de las RID fue de 70% para vitamina A, 75% para B6, 56% para vitamina C, 33% para B12, 69% para folato, 33% para calcio y 22% para hierro. Conclusiones. Los hallazgos muestran deficiencias importantes en la dieta, las cuales son más acentuadas en mujeres embarazadas o nodrizas, en las de menor nivel socioeconómico, en las que habitan en áreas predominantemente rurales o indígenas y en las de la región sur.

  10. Implicaciones medioambientales y socioeconómicas de las energías renovables

    Directory of Open Access Journals (Sweden)

    Carlos J. Pardo Abad

    2001-06-01

    Full Text Available El impacto de la energía sobre el medio ambiente es profundo y cada vez más complicado de resolver. Los problemas afectan a distintas escalas geográficas y demandan la participación más activa de las energías renovables. Los beneficios no sólo son medioambientales sino también económicos y sociales: reducción de emisiones contaminantes a la atmósfera, creación de empleo, impulso tecnológico, incremento de la competitividad industrial, modernización y desarrollo de recursos propios en áreas rurales, etc.The impact of energy on environment is deep and it is becoming more and more complicated to resolve. The problems affect several geographical scales and require a more active participation of renewable energies. Benefits are not only environmental, but also economic and social: reduction of pollutant emissions to atmosphere, creation of newjobs, technological boost, increase of the industrial competitiveness, modernization and development of own resources in country áreas, etc.

  11. Can conflict be energizing? a study of task conflict, positive emotions, and job satisfaction.

    Science.gov (United States)

    Todorova, Gergana; Bear, Julia B; Weingart, Laurie R

    2014-05-01

    Scholars have assumed that the presence of negative emotions during task conflict implies the absence of positive emotions. However, emotions researchers have shown that positive and negative emotions are not 2 ends of a bipolar continuum; rather, they represent 2 separate, orthogonal dimensions. Drawing on affective events theory, we develop and test hypotheses about the effects of task conflict on positive emotions and job satisfaction. To this end, we distinguish among the frequency, intensity, and information gained from task conflict. Using field data from 232 employees in a long-term health care organization, we find that more frequent mild task conflict expression engenders more information acquisition, but more frequent intense task conflict expression hinders it. Because of the information gains from mild task conflict expression, employees feel more active, energized, interested, and excited, and these positive active emotions increase job satisfaction. The information gained during task conflict, however, is not always energizing: It depends on the extent to which the behavioral context involves active learning and whether the conflict is cross-functional. We discuss theoretical implications for conflict, emotions, and job satisfaction in organizations. (c) 2014 APA, all rights reserved.

  12. Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence

    Science.gov (United States)

    González, C. A.; Dmitruk, P.; Mininni, P. D.; Matthaeus, W. H.

    2017-11-01

    In this paper, we analyze the effect of dynamical three-dimensional magnetohydrodynamic (MHD) turbulence on test particle acceleration and compare how this evolving system affects particle energization by current sheet interaction, as opposed to frozen-in-time fields. To do this, we analyze the ensemble particle acceleration for static electromagnetic fields extracted from direct numerical simulations of the MHD equations, and compare it with the dynamical fields. We show that a reduction in particle acceleration in the dynamical model results from particle trapping in field lines, which forces the particles to be advected by the flow and suppresses long exposures to the strong electric field gradients that take place between structures and generate (among other effects) an efficient particle acceleration in the static case. In addition, we analyze the effect of anisotropy caused by the mean magnetic field. It is well known that for sufficiently strong external fields, the system experiences a transition toward a two-dimensional flow. This causes an increment in the size of the coherent structures, resulting in a magnetized state of the particles and a reduction in particle energization.

  13. Potencial de secado de yuca con aire natural y energía solar

    Directory of Open Access Journals (Sweden)

    Alfonso Parra Coronado

    1990-01-01

    Full Text Available En este trabajo se presentan los resultados de estudios del potencial de secado de productos agropecuarios con aire natural y energía solar de regiones tropicales, considerando el caso específico de la yuca. La evaluación del potencial de secado de una región se basa en el uso de un programa de computador  Simulación matemática, mediante el cual se obtienen los valores del caudal mínimo de aire requerido para secar el producto antes que éste alcance un nivel de deterioro preestablecido. Otros elementos metodológicos incluyen: manejo de la información meteorológica, mes crítico, patrón de agitación del producto, hora de iniciación del secado, patrón de operación del ventilador, uso de calor suplementario (energía solar e interpretación de los resultados con el fin de optimizar el sistema. Se presentan mapas para Colombia de líneas isocaudales e isoáreas de colector solar plano, con base en los cuales se puede obtener fácilmente la información requerida para el diseño de sistemas de secado de yuca a baja temperatura.

  14. Cálculo del ahorro de energía por menor fricción

    Directory of Open Access Journals (Sweden)

    Pedro Albarracín Aguillón

    2004-01-01

    Full Text Available En este artículo se expone como disminuir costos de operación (menor consumo de energía, costos de mantenimiento y pérdidas de producción de equipos, mediante el control de los diferentes fenómenos de la fricción en mecanismos lubricados. Para hacer esto posible es necesario conocer las condiciones criticas de trabajo de los mismos, a que tipo de lubricación corresponden, y que clase lubricante requiere, para así calcular los valores de los coeficientes de fricción de los lubricantes que se están empleando y compararlos con los de otros lubricantes que pueden dar lugar a ahorros de energía y mantenimiento. Además se presentan algunos ejemplos tomados de casos reales, que confirman que con una buena implementación de un programa de tribologia se obtienen resultados satisfactorios desde el punto de vista económico.

  15. Organización Institucional en el Sector Energético en el Uruguay y participantes en el mismo

    Directory of Open Access Journals (Sweden)

    José A. Alem Deaces

    2014-02-01

    Full Text Available La energía , su probable falta o escasez, precio y su importancia en la satisfacción de necesidades mínimas humanas,  en el desarrollo y crecimiento de los países mediante la producción, aunque siempre ha sido un tema en estudio, ha cobrado en la actualidad mayor relieve.Ningún país es pasivo ante ello y adecuan su organización a fin de satisfacer sus necesidades y con ella las de sus poblaciones.Hemos asistido  a un proceso de creación de nuevas personas públicas y privadas que se sumaron a las ya existentes, para participar en el ciclo energético.Este proceso cobró impulso en los tres últimos lustros.El Estado, ha tomado decisiones, sea favoreciendo la apertura del mercado energético, sea buscando viabilizar conexiones internacionales, que han llevado a cambios en el sector institucional referido a la energía.Se ha avanzado a tal punto, que ya podríamos hablar de un “Derecho de la Energía”, lo que será objeto de discusión en su momento, con este trabajo pretendo iniciar el estudio y discusión profundo desde el punto de vista jurídico de un tema, que ha cumplido la mayoría de edad.La determinación de las personas que intervienen el ciclo energético, es un importante primer paso.

  16. Monitoreo energético y estrategias de RETROFIT para viviendas sociales en clima frío.

    Directory of Open Access Journals (Sweden)

    Micaela Andersen

    2017-12-01

    Full Text Available El presente trabajo aborda la aplicación de tecnologías y pautas para el reciclado masivo de viviendas urbanas representativas. Se evalúa aquí el comportamiento energético actual en una vivienda social “tipo” con un alto nivel de replicabilidad. Para ello, se cuantifica el potencial ahorro energético al aplicar diversas estrategias de mejoramiento de la envolvente edilicia que permitan arribar a valores admisibles de pérdidas térmicas, de acuerdo con la normativa argentina. Se describe la tecnología, el comportamiento térmico y energético de una vivienda perteneciente al barrio “645 Viviendas” (desarrollado por El Instituto de Planificación y Promoción de la Vivienda, ubicada en la ciudad de San Carlos de Bariloche, en la zona bioambiental IV, muy fría. Este barrio presenta una emergencia energética de gran magnitud, ya que no se encuentra conectado a la red de gas natural. Posteriormente, se examinan los resultados de la auditoria energética de 2016 y se muestra la simulación térmica realizada en Ecotect Analysis 2011, incorporando las condiciones reales de uso auditadas. Ajustado el modelo, se analizan 24 estrategias de mejoramiento de la envolvente térmica, posibilitando la identificación de las estrategias de mayor impacto en la reducción de la demanda energética.

  17. De molinos y quijotes. Energía eólica y cooperativismo en el sur bonaerense

    Directory of Open Access Journals (Sweden)

    Luciana Clementi

    2014-06-01

    Full Text Available El constante aumento en la demanda de energía evidenciado en Argentina, sumado al fuerte interés nacional por alcanzar mayor seguridad energética, profundiza la necesidad de nuevas inversiones en el sector energético. Sin embargo, la dependencia que sufre el país en relación a los hidrocarburos hace peligrar el abastecimiento en el largo plazo. En este contexto, aparecen en la última década proyectos de producción de energía renovable, incentivados por un contexto mundial donde se alienta el desarrollo de fuentes energéticas que contribuyan a avanzar hacia un modelo más sustentable. En este escenario, interesa en este trabajo analizar el rol de las cooperativas eléctricas fuertemente ancladas en la Provincia de Buenos Aires, en la ejecución de proyectos locales que contemplan la producción de energía eólica en el Sur bonaerense, para reflexionar acerca de las oportunidades y barreras a las que se enfrentan. The constant increase of energy demands in Argentina together with the strong national interest to obtain a higher energy security, deepens the need of new investments in the energy sector. However, the dependence of the country on hidrocarbons threatens the supply in the long-term. In this context appear in the last decade, renewable energy production projects, triggered by a global context which encourages the development of energy sources that favor a cleaner and more sustainable model. In this scenario, it is of interest in this paper to analyze the role of cooperatives of electricity well-established in the Province of Buenos Aires, mainly in the performance of local projects that consider eolic energy production in the South of Buenos Aires, in order to reflect upon the new opportunities as well as the barriers they must deal.

  18. Comparación de Demandas Energéticas en Viviendas Unifamiliares en Climas Extremos

    Directory of Open Access Journals (Sweden)

    Carolina Reyes Morales

    2017-12-01

    Full Text Available En Chile se están definiendo metas en el ámbito del uso de la energía, que acercan cada vez más la construcción al tipo sustentable. Esto queda evidenciado con el Código de Construcción Sustentable, donde además de establecerse nuevas exigencias con lo que respecta a las transmitancias térmicas de los parámetros opacos y acristalados, se presentan límites en las demandas máximas para climatización. Pese a que para la Región de Magallanes la construcción sustentable es un gran desafío, dadas las extremas condiciones climáticas a las que está sometida y la gran lejanía existente con las principales empresas del rubro, lo cual eleva considerablemente los costos, en los últimos años se han buscado alternativas que permitan mejorar los estándares constructivos y cumplir con las nuevas metas país. Este artículo presenta el trabajo desarrollado para establecer la línea base energética en el sector residencial privado de la Región de Magallanes en Chile, con el fin de conocer el estándar actual de construcción, a través del estudio de las especificaciones técnicas de los proyectos y mediciones de temperatura, humedad e infiltraciones. La metodología utilizada fue trabajar mediante simulación, con el software Design Builder v.4, todos los parámetros mencionados, para veinte modelos de viviendas del sector privado de la región, lo que ha permitido establecer diferencias entre los requerimientos energéticos para mantener el confort 24/7 y las demandas existentes en ellas establecidas por los sistemas de calefacción reales y los horarios de uso. Los primeros resultados muestran que en la Región de Magallanes las demandas requeridas para un confort 24/7 son en promedio 550 [kWh/m2] y si bien para las demandas existentes los resultados son similares, no se alcanzan temperaturas óptimas dada la alta cantidad de pérdidas energéticas producto de infiltraciones y un sistema de calefacción inapropiado. Esta situación que

  19. Importancia energética y ambiental de la Biomasa en Colombia

    Directory of Open Access Journals (Sweden)

    Hernández Luis Alfredo

    1994-12-01

    Full Text Available

    Entiéndase por energía de la biomasa aquélla que se origina al procesar parcial o totalmente cualquier sustancia o materia originada a través del proceso de fotosíntesis de los vegetales. Luego comprende especies y microespecies que cumplen para el hombre y el ecosistema una función especial ligada a factores climáticos, geomorfológicos y socioeconómicos. Antes de la aparición de los combustibles fósiles (otra forma concentrada de biomasa y de la electricidad, la biomasa constituía la principal oferta energética para el desarrollo y sobrevivencia del hombre. Si se tiene en cuenta que en el proceso de alimentación humana, el hombre y los animales utilizan menos del10% de la biomasa producida, queda un sobrante en estado sólido o en suspensión y que, por sus grandes volúmenes, genera problemas de contaminación en el campo y la ciudad, por ejemplo, basuras, residuos de plazas de mercado, pulpa de café, residuos de matadero, de procesamiento de vegetales, lácteos, y licoreras, residuos domésticos y residuos animales entre otros. Para el procesamiento o aprovechamiento de estos residuos existen tecnologías que buscan incorporarlos, en términos de materia y/o energía, a los procesos energéticos y agrícolas, captando de ellos, principalmente los valiosos elementos que los originaron. Dentro de estas tecnolog

  20. Mejoras energéticas en un horno industrial de una empresa petr oquímica

    OpenAIRE

    Moldovan, Gabriel Ionut

    2016-01-01

    Treball Final de Grau en Enginyeria en Tecnologies Industrials. Codi: ET1040. Curs: 2015/2016 El problema energético mundial se resume en que nuestra bonanza social y económica, nuestra tecnología y nuestra sociedad dependen enormemente de la sobreexplotación de recursos naturales no renovables. La situación energética actual es insostenible a largo plazo y las consecuencias de seguir igual en el futuro serían devastadoras. Es necesario pues, un cambio de rumbo aunque la situa...

  1. Estudio energético en el taller de chapistería en Volkswagen Navarra S.A.

    OpenAIRE

    Echavarren Sarasibar, Sergio

    2016-01-01

    El presente proyecto se ha desarrollado con el objetivo de obtener la titualción de Grado en Tecnología Indistriales de la Univerisdad Pública de Navarra. El proyecto recoge un descripción detallada de las instalaciones de aire comprimido en taller de Chapisteria, una documentación de consumos, equipos, instalaciones con el objetivo de detectar derroches energéticos en la instalación. Con dichos derroches se ha realizado medidas de ahorro que reducen el gasto energético d...

  2. Aplicación de sistemas de gestión energética sector comercio, caso hoteles

    OpenAIRE

    Auladell Roig, Marc

    2012-01-01

    El presente proyecto se centra en la realización de auditorías energéticas aplicadas en el sector terciario, más concretamente, en los establecimientos hoteleros. La primera parte consiste en la compilación de una base teórica sobre el tema con especial atención a las guías de ahorro publicadas por los entes públicos con competencia en medidas de eficiencia energética. Con posterioridad, se traslada la gestión de los conceptos teóricos adquiridos mediante una metodología ...

  3. Morteros acumuladores con parafinas microencapsuladas para el aprovechamiento de la energía solar en suelos radiantes

    OpenAIRE

    Zetola Vargas, Vicente Andrés

    2013-01-01

    Esta Tesis plantea la pregunta de si el uso de morteros con parafinas microencapsuladas combinado con colectores solares térmicos puede reducir el consumo de energías convencionales, en un sistema tradicional de suelo radiante. Se pretende contribuir al conocimiento acerca del efecto que produce en el edificio, el calor latente acumulado en suelos radiantes, utilizando morteros de cemento Portland con material de cambio de fase (PCM), en conjunto con la energía solar. Para cumplir con este pr...

  4. O contexto atual da reabilitação energética do parque edificado em Portugal

    OpenAIRE

    Abreu, Maria Isabel; Oliveira, Rui; Lopes, Jorge

    2012-01-01

    No seu Plano de Ação para a Eficiência Energética de 2011, a Comissão Europeia refere que o parque edificado apresenta um grande potencial de poupança energética. A nova Diretiva Europeia 2010/31/EU, em processo de transposição para legislação portuguesa, veio desafiar os estados membros a tomarem medidas ainda mais ambiciosas. Concretamente, estabelece que os estados membros elaborem planos periódicos onde constem instrumentos que reduzam as barreiras existentes e encorajem os investiment...

  5. El desafío de habitar con la incorporación de energías limpias

    OpenAIRE

    Angiolini, Silvina; Jerez, Lisardo; Pacharoni, Ana; Ávalos, Pablo; Gatani, Mariana; Bracco, Marta

    2015-01-01

    En los últimos años la situación energética y los problemas de contaminación ambiental han originado una preocupación general por el uso indiscriminado de las energías no renovables en nuestros edificios. Los modos de habitar que nos llevaron a la crisis climática global hoy son replanteados en post de reducir los múltiples impactos en nuestro medio. Esto ha propiciado el impulso y desarrollo de actuaciones de investigación y desarrollo, promoción e implantación de tecnologías renovables, en ...

  6. Propuestas de mejora al mercado de energía mayorista para asegurar la confiabilidad del Sistema Interconectado Nacional

    OpenAIRE

    Castillo Marín, Jaime Alonso

    2016-01-01

    Las fallas de mercado justifican la regulación en los mismos y dadas las características del sector eléctrico se han realizado diseños de mercados en búsqueda de una asignación eficiente de los recursos -- Este diseño para el Mercado de Energía Mayorista en Colombia se ha mantenido en esencia igual desde sus inicios, a excepción de la creación del mercado de confiabilidad desarrollado posteriormente -- Ante periodos de escasez en la oferta, en el Mercado de Energía Mayorista se ha visto la ne...

  7. “estudio y simulación energética del edificio de la fiec con energyplus”

    OpenAIRE

    Briceño Maldonado, Richard Manuel

    2013-01-01

    En este documento se presenta el estudio energético y análisis de cargas térmicas del edificio de la Facultad de Ingeniería en Electricidad y Computación. El objetivo principal es realizar recomendaciones para disminuir la demanda de energía eléctrica debido a la excesiva carga térmica generada por los lucernarios de policarbonato alveolar. Se analizaron varias herramientas informáticas, y mediante matriz de decisión, se escogió a la denomina EnergyPlus. Se realizaron seis comparaciones a tra...

  8. “estudio y simulación energético del edificio de la fiec con energyplus”

    OpenAIRE

    Briceño Maldonado, Richard Manuel; Peña Toro, Ph.D. Paulo

    2013-01-01

    En este documento se presenta el estudio energético y análisis de cargas térmicas del edificio de la Facultad de Ingeniería Eléctrica y Computación. El objetivo principal es realizar recomendaciones para disminuir la demanda de energía eléctrica debido a la excesiva carga térmica generada por los lucernarios de policarbonato alveolar. Se analizaron varias herramientas informáticas, y mediante matriz de decisión, se escogió a la denomina EnergyPlus. Se realizaron seis comparaciones a través de...

  9. Los ciudadanos castellano-manchegos y el uso de la energía: medio rural versus medio urbano

    OpenAIRE

    Colmenero Herreros, Isabel

    2016-01-01

    El objetivo principal de esta tesis es indagar en los comportamientos de uso energético de la ciudadanía castellano-manchega comparativamente entre el medio rural y urbano, considerando, por un lado, las características sociales de los individuos, sus perfiles, y por otro diferenciar los hábitos energéticamente eficientes y los ineficientes, y su evolución en el tiempo. Se profundiza en un tema novedoso y de futuro en España: no solo constituye el primer estudio que indaga en este tema, sino...

  10. Thermomagnetic torques in polyatomic gases

    Science.gov (United States)

    Hildebrandt, A. F.; Wood, C. T.

    1972-01-01

    The application of the Scott effect to the dynamics of galactic and stellar rotation is investigated. Efforts were also made to improve the sensitivity and stability of torque measurements and understand the microscopic mechanism that causes the Scott effect.

  11. Photodissociation dynamics of polyatomic molecules

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, Hequan [Iowa State Univ., Ames, IA (United States)

    1998-02-23

    This report consists of five studies as follows: A laser photofragmentation time-of-flight mass spectrometric study of acetophenone at 193 and 248 nm; A 193 nm laser photofragmentation time-of-flight mass spectrometric study of dimethylsulfoxide; 193 nm laser photofragmentation time-of-flight mass spectrometric study of HSCH2CH2SH; Thiophene biradical decay of the primary laser photofragmentation product at 193 nm; and Scattering cross sections for O(3P)[SO(X,3Σ-)] + He[Ne, Ar, Kr]. Chapters are included for the introduction and general conclusions.

  12. Multiphoton dissociation of polyatomic molecules

    International Nuclear Information System (INIS)

    Schulz, P.A.

    1979-10-01

    The dynamics of infrared multiphoton excitation and dissociation of SF 6 was investigated under collision free conditions by a crossed laser-molecular beam method. In order to understand the excitation mechanism and to elucidate the requirements of laser intensity and energy fluence, a series of experiments were carried out to measure the dissociation yield dependences on energy fluence, vibrational temperature of SF 6 , the pulse duration of the CO 2 laser and the frequency in both one and two laser experiments. Translational energy distributions of the SF 5 dissociation product measured by time of flight and angular distributions and the dissociation lifetime of excited SF 6 as inferred from the observation of secondary dissociation of SF 5 into SF 4 and F during the laser pulse suggest that the dynamics of dissociation of excited molecules is dominated by complete energy randomization and rapid intramolecular energy transfer on a nanosecond timescale, and can be adequately described by RRKM theory. An improved phenomenological model including the initial intensity dependent excitation, a rate equation describing the absorption and stimulated emission of single photons, and the unimolecular dissociation of excited molecules is constructed based on available experimental results. The model shows that the energy fluence of the laser determines the excitation of molecules in the quasi-continuum and the excess energy with which molecules dissociate after the laser pulse. The role played by the laser intensity in multiphoton dissociation is more significant than just that of overcoming the intensity dependent absorption in the lowest levels. 63 references

  13. Actividad económica, consumo final de energía y requerimientos de energía primaria en Cataluña, 1990-2005. Análisis mediante el uso de los balances energéticos desde una perspectiva input-output

    OpenAIRE

    Jordi Roca Jusmet; Vicent Alcántara Escolano; Emilio Padilla Rosa

    2007-01-01

    Este trabajo analiza la evolución de los consumos finales de energía en Cataluña durante el periodo 1990-2005. En conjunto, los consumos finales de energía crecen por encima del crecimiento del PIB en términos reales. La disponibilidad actual de datos permite una desagregación en cinco actividades: sector primario; sector industrial; sector servicios; transporte; y sector doméstico. Los aumentos relativos más importantes se dan en los sectores servicios, doméstico y transporte. Es esta última...

  14. Diseño metodológico de la evaluación de proyectos energéticos bajo incertidumbre en precios: caso de cogeneración de energía en una empresa en Cali

    Directory of Open Access Journals (Sweden)

    Carlos Andrés Núñez Viveros

    2013-01-01

    Full Text Available Los recursos energéticos en la industria recobran mayor relevancia en su competitividad, representando el se- gundo o tercer rubro en el costo. El comportamiento fluctuante de los costos históricos, así como la incertidum- bre de su tendencia futura, acentuada por la inminencia del desmonte del impuesto de contribución en energía eléctrica (20% de la tarifa, conllevan el cuestionamiento de si los proyectos de cogeneración de energía tendrán viabilidad en un futuro cercano. El presente trabajo desarrolla una metodología innovadora para evaluar la via- bilidad de la implementación de proyectos de cogeneración, fundamentada en 3 simuladores que trabajan con información estadística y proyecciones matemáticas, además de realizar un análisis de sensibilidad del proyecto a los comportamientos proyectados de los precios futuros de la energía eléctrica y de los combustibles.

  15. Energize New York -- Residential Energy Efficiency Market Transformation in New York

    Energy Technology Data Exchange (ETDEWEB)

    Bregman, Thomas M.

    2013-12-31

    Energize New York (ENY) is focused on addressing known barriers to widespread energy efficiency (EE) adoption by property owners. In simple terms ENY works to; 1) increase homeowner trust by using known and trusted community leaders to communicate their own positive experiences with EE and ENY, 2) reduce friction points by integrating support staff and creative use of technology that ease a homeowner’s way forward through the EE upgrade process, 3) increase homeowner knowledge and trust of specific EE benefits through access to the ENY energy coach, 4) provide information on available financing options that show benefits (e.g. positive cash flow), and 5) provide tools and mechanisms that give homeowners greater comfort in evaluating and selecting the right contractor. These five fundamental program aspects are supported by a hyper-local communications and outreach model and a “lead by example” philosophy that requires community leaders to step forward and model energy efficiency behavior by example. In the communities where the program has successfully engaged local leadership and “trusted community sources” there has been a significant increase in the uptake of energy efficiency work. Quantitatively this growth translated into an increase of 240% in completed Home Performance projects from the two year pre-pilot period (2009-10) to the two year post-pilot period (2012-13). Additionally, the program has seen measureable increases in the output and performance of contractors who are members of the Energize Comfort Corps, a program innovation which included a subset of the NYSERDA approved and Building Performance Institute accredited home performance contractors. This innovation, launched in the later stages of the pilot, is paired with the Energize Contractor Ratings Index (CRI) and helps frame the provider market by giving homeowners a mechanism to provide and receive feedback on their contractor experience. The data incorporated into the CRI along with

  16. Indentación por impacto de baja energía: modelo completo

    Directory of Open Access Journals (Sweden)

    Jiménez, O.

    2004-04-01

    Full Text Available The present work propose is the polymer and composites mechanical proprieties evaluation, using low energy impact techniques in flexure plate configuration hitting by a semi spherical indenters and working with a non linear and non conservative model that involve the permanent deformations due to the impact flexure and indentation. Two systems arrayed in serial configuration, a flexion spring-dashpot and an indentation hertzian spring-dashpot, conform this model. Since this do not have analytical solutions, a 4rd order Runge-Kutta numeric model is used in order to solve it and is compared with experimental results measuring the global energy lost with the restitution coefficient. Different polystyrene (PS matrix composites series with elastomeric and rigid dispersed phases were tested. A satisfactory model approach to the registered experimental curves is showed, allowing the elastic modulus calculus at high impact velocities and also the determination of the energy at the beginning of the specimen damage.

    El objetivo de este trabajo es la evaluación de las propiedades mecánicas de polímeros y composites mediante el uso de técnicas de impacto de baja energía en configuración de flexión, de platos golpeados con cabezales semiesféricos, utilizando para ello un modelo no lineal y no conservativo que involucre el efecto de las deformaciones permanentes inherentes a la flexión y a la indentación presentes en el proceso de impacto. Este modelo esta compuesto por dos sistemas en serie: resorte-amortiguador para la flexión y resorte hertziano-amortiguador para la indentación. Al carecer éste de soluciones analíticas, se resuelve usando el método numérico de Runge-Kutta de cuarto orden, comparándose con resultados experimentales y evaluando, mediante el coeficiente de restitución, las pérdidas globales de energía ocasionadas durante el ensayo. Se realizaron ensayos en varias series de composites de matriz polimérica de

  17. Evaluación del potencial energético del oleaje en la costa sur del Golfo de México

    Directory of Open Access Journals (Sweden)

    Alejandro González-Carrillo

    2015-01-01

    Full Text Available Hallar nuevas fuentes de energía es uno de los retos que trajo consigo el siglo XXI. En este tr abajo se hace un análisis sobre la energía de las olas, la cual presenta varia s ventajas significativas con r especto a otras fuentes de energ ías basadas en combustibles fós iles e, inclusive, otras fuentes renovables de energía. De entre estas ventajas de stacan el bajo impacto ambiental y su alta densidad energética, respectivamente. La energía de las olas del mar se considera ca da vez en más países como un recurso renovable importante y sob re todo prometedor. El objetivo de este trabajo es la evaluación del po tencial energético de las olas en la costa sur del Golfo de Méx ico; en él se observó el comportamiento del olea je y se obtuvo que la potenci a media anual disponible es de 55.91 W/m. Adicionalmente, se de staca el comportamiento estacional de las olas en la región; pues, en es te punto, la estación más energética es otoño y la menos energé tica es primavera, lo cual difiere de la tendencia mundial, en la que i nvierno y verano son la más y la menos energética, respectivamente.

  18. Neutron activation analysis measurements of sub micron aerosol deposition onto a cylinder energized with an alternating electric field

    Energy Technology Data Exchange (ETDEWEB)

    Fila, M S [Toronto Univ., ON (Canada). Dept. of Chemical Engineering and Applied Chemistry

    1994-12-31

    Experimental measurements of aerosol deposition onto a cylinder energized with a 60 Hz electric field were conducted using a neutron activation analysis technique with a hafnium salt aerosol. The measured collection efficiencies were compared to theoretical expressions based on an electrostatic collection mechanism and fair agreement was found. (author). 5 refs., 1 tab., 2 figs.

  19. Modelo para la Predicción Energética de una Instalación Hotelera

    Directory of Open Access Journals (Sweden)

    Adriana V. Acosta

    2011-10-01

    Full Text Available Resumen: Este artículo describe la obtención y validación de un modelo de predicción energética para el hotel Meliá Habana de la ciudad Habana en Cuba. El modelo obtenido emplea el método de series de tiempo radiantes para la determinación de la carga térmica de los bloques habitacionales de la instalación. El modelo es implementado en el lenguaje de programación MatLab®. La validación experimental del modelo se realiza con mediciones reales del consumo energético diario del hotel. El valor de uso del modelo obtenido es apreciable para estudios de comportamiento energético y para la implementación de estrategias avanzadas de control. Palabras clave: Modelado, Control de la Energía, Coeficientes de Temperatura, Validación

  20. Eficiencia energética y confort en edificios de oficina: El caso alemán

    Directory of Open Access Journals (Sweden)

    Ernesto Kuchen

    2012-12-01

    Full Text Available La construcción de edificios en los últimos 15 años en Europa persigue el objetivo común de dar respuesta al problema de la Eficiencia Energética y el Confort en espacios de trabajo. Las propuestas de cambio se inclinan por el desarrollo de una arquitectura “transparente”, con extensas superficies de vidrio expuestas. Dicha práctica se hace llamar ecológica y sustentable. Con el tiempo, el uso y la experiencia ponen en alerta a científicos del área. El objetivo del trabajo es detectar los aspectos más relevantes que afectan la Eficiencia Energética (EE y el Confort de espacios reales de trabajo para la elaboración apropiada de herramientas de diseño y cálculo. Para ello, se lleva a cabo un trabajo de campo en base a mediciones y encuestas en 19 edificios de oficina, en Alemania. Del monitoreo energético y del análisis del Confort se detectan potenciales de optimización. Se observa que la EE no se logra al conectar el edificio a la red energética una vez finalizada la obra arquitectónica. Por el contrario, la planificación integral, el monitoreo y el seguimiento en la vida útil del edificio permiten corregir y lograr mejores niveles de EE y Confort.

  1. Efectos de la entropía urbana en el coste energético del trasporte

    Directory of Open Access Journals (Sweden)

    Francisco Bascuñán Walker

    2011-05-01

    Full Text Available El objetivo del trabajo presentado fue descubrir los efectos de la diversidad de uso de suelo o entropía urbana sobre el gasto energético del transporte. Se eligió como zona de estudio la ciudad de La Serena y se encuestó a un grupo representativo de familias con gastos energéticos y de estratos sociales diversos y se comparó con las zonas urbanas de diferentes grados de entropía. El estudio mostró que, indistintamente del nivel social, los habitantes de las zonas que mostraban niveles mayores de entropía gastaban menos energía en traslados a destinos urbanos que aquellos que vivían en zonas de menores entropías. Basados en los resultados del estudio se concluyó que para disminuir el gasto energético en trasporte de los habitantes de la ciudad se requería incrementar el nivel de entropía. La alternativa más eficiente estudiada fue contemplar en la planificación urbana, pequeños policentros de multiservicios (más de tres servicios diferentes que cubran una superficie de población urbana de 78 has aproximadamente.

  2. Yuca ensilada como fuente de energía para cerdos en crecimiento

    Directory of Open Access Journals (Sweden)

    Pedro Lezcano Perdigón

    2014-01-01

    Full Text Available Se condujeron dos experimentos para determi - nar el comportamiento de cerdos en crecimiento, comparando la dieta de maíz-soya con otra de raíz de yuca ensilada con agua o vinaza. Se utilizaron 16 cerdos de cruce comercial alojados en corrales individuales, mediante clasificación simple y dos tratamientos con ocho repeticiones/ tratamiento. En el segundo trabajo se utilizaron 16 animales en similares condiciones, con vina - za para ensilar. No fueron encontradas diferen - cias significativas para la ganancia diaria (g y conversión alimentaria (kg kg -1 . Se concluye que la raíz de yuca ensilada con agua y yogurt o vinaza, puede sustituir totalmente la energía del maíz para cerdos en crecimiento.

  3. H3+: superficies de energía potencial, estados y transiciones rovibracionales

    Science.gov (United States)

    Aguado, M. Paniagua Y. A.

    Hemos calculado varias superficies globales de energía potencial para el estado fundamental y excitados del sistema H3+ en más de ocho mil geometrías diferentes usando una base (9s 3p 1d)/[4s 3p 1d] en cada átomo de Hidrógeno y mediante un método de cálculo de interacción de configuraciones completa (FCI). Hemos ajustado las superficies a formas analíticas del tipo Aguado y Paniagua con un error promedio menor de 50 cm-1 y menor en el pozo de potencial del estado fundamental. Finalmente hemos calculado y analizado los niveles vibracionales para los dos estados electrónicos más bajos, siendo la desviación respecto de los mejores valores publicados, tanto experimentales como teóricos, de unos pocos números de onda.

  4. Electron Energization and Structure of the Diffusion Region During Asymmetric Reconnection

    Science.gov (United States)

    Chen, Li-Jen; Hesse, Michael; Wang, Shan; Bessho, Naoki; Daughton, William

    2016-01-01

    Results from particle-in-cell simulations of reconnection with asymmetric upstream conditions are reported to elucidate electron energization and structure of the electron diffusion region (EDR). Acceleration of unmagnetized electrons results in discrete structures in the distribution functions and supports the intense current and perpendicular heating in the EDR. The accelerated electrons are cyclotron turned by the reconnected magnetic field to produce the outflow jets, and as such, the acceleration by the reconnection electric field is limited, leading to resistivity without particle-particle or particle-wave collisions. A map of electron distributions is constructed, and its spatial evolution is compared with quantities previously proposed to be EDR identifiers to enable effective identifications of the EDR in terrestrial magnetopause reconnection.

  5. Propuesta intervención energética en un edificio plurifamiliar

    OpenAIRE

    López Burdeus, Paula

    2013-01-01

    Treball final de Grau corresponent a la titulació d'Arquitectura Tècnica. Curs 2012/2013 Uno de los aspectos fundamentales en un edificio residencial es el confort térmico, se considera cada vez más relevante minimizar las pérdidas térmicas a través de la envolvente de las edificaciones y de sus instalaciones, garantizando un mínimo de confort. Cabe destacar también que la existencia de pérdidas térmicas suponen el derroche de energía. Es por ello que cuando se habla de rehabilitación s...

  6. Las locomotoras del desarrollo: Minas, energía e innovación

    Directory of Open Access Journals (Sweden)

    Olga Lucía Polanía

    2011-01-01

    Full Text Available El gobierno colombiano, en el Plan Nacional de Desarrollo, establece unas locomotoras que prometen impulsar la economía del país. En este artículo, se analizaran dos de ellas: la locomotora minero energética y la locomotora de los sectores basados en innovación. En ambos casos, se estudia su protagonismo para alcanzar las proyecciones que el gobierno espera para el 2014. También se presenta el escenario actual, los retos, las metas y las estrategias específicas para lograr los objetivos establecidos.//The Colombian government, through its National Development Plan, establishes several "engines" that promise to advance the country's economy. This article analyzes two of them: energy mining and innovation-based sectors. In both cases, the article analyzes the Plan's role in reaching government projections for 2014. It also introduces the current situation, challenges, goals, and specific strategies to achieve established objectives.

  7. Avaliação energética da empresa RENOPEL

    OpenAIRE

    Silva, Fábio André Pereira da

    2016-01-01

    A presente dissertação insere-se no âmbito da unidade curricular “Dissertação” do 2º ano de Mestrado de Engenharia Eletrotécnica- Sistemas Elétricos de Energia, tendo sido realizada na empresa Renopel que é uma Lavandaria Industrial que se situa na Maia. O objetivo desta dissertação era a realização de uma Avaliação energética (AE) à Renopel que tem elevados consumos de energia, tanto a nível térmico como elétrico e no ano de 2015 consumiu aproximadamente 800 MWh em gás natural...

  8. Estrategia de cobertura con productos derivados para el mercado energético colombiano

    Directory of Open Access Journals (Sweden)

    Jhon Alexis Díaz Contreras

    2014-01-01

    Full Text Available El desarrollo que ha presentado el mercado mayorista de energía en Colombia ha permitido que hoy en día se estén negociando futuros de electricidad en el mercado de capitales local. Este trabajo tiene como objetivo diseñar un producto derivado en el que subyace el precio de la electricidad. Para esto, se analiza la serie de tiempo del precio de la electricidad para modelar su volatilidad; y a partir de esta, se diseña una opción exótica tipo barrera que muestra cómo se pueden usar este tipo de productos financieros en la cobertura de riesgos de los agentes del mercado.

  9. Estrategia de cobertura con productos derivados para el mercado energético colombiano

    Directory of Open Access Journals (Sweden)

    Jhon Alexis Díaz Contreras

    2014-01-01

    Full Text Available El desarrollo que ha presentado el mercado mayorista de energía en Colombia ha permitido que hoy en día se estén negociando futuros de electricidad en el mercado de capitales local. Este trabajo tiene como objetivo dise ̃ nar un producto derivado en el que subyace el precio de la electricidad. Para esto, se analiza la serie de tiempo del precio de la electricidad para modelar su volatilidad ; y a partir de esta, se dise ̃ na una opción exótica tipo barrera que muestra cómo se pueden usar este tipo de productos financieros en la cobertura de riesgos de los agentes del mercado.

  10. Estudio de ventajas energéticas en un proceso de destilación

    Directory of Open Access Journals (Sweden)

    Carlos Ariel Cardona Alzate

    2013-04-01

    Full Text Available Este trabajo desarrolla un método para comparar los gastos energéticos entre las configuraciones secuencial (reacción-separación y simultánea (destilación reactiva, analizando los flujos internos y externos de un proceso. Como ejemplo se utilizó una reacción tipo: A + B D C + D; con temperaturas de saturación: TCσ

  11. Diagramas de energía, fuerza y materia = Diagrams of energy, force and matter

    Directory of Open Access Journals (Sweden)

    Josep Maria Montaner

    2013-10-01

    Full Text Available ResumenEn este ensayo se va a tratar sobre arquitectura a partir de la definición de forma como “estructura esencial e interna, como construcción del espacio y de la materia”. Para ello, podemos establecer, como punto de partida, que el proceso de la arquitectura va de la energía, las fuerzas y la materia hacia la forma. Por tanto, teorizar sobre la forma en arquitectura nos lleva a reflexionar sobre tres fenómenos previos a su configuración: la energía, las fuerzas y la materia. Para seguir estos procesos físicos es útil remitirse al pensamiento postestructuralista de Gilles Deleuze y Félix Guattari, especialmente a su texto Mil Mesetas. Capitalismo y esquizofrenia (1980 y a conceptos como “rizoma” y “agenciamiento” y, sobre todo, utilizar la herramienta interpretativa y creativa del “diagrama”.Palabras claveenergía, fuerza, materia, forma, Deleuze, GuattariAbstractThis essay will deal on architecture from the defi nition of form as "critical and internal structure  as construction of space and matter." For that, we can establish, as a starting point, that the process of architecture goes from energy, forces and matter to form. Thus, theorizing about form in architecture leads us to refl ect on three prior phenomena to its confi guration: energy, forces and matter. To follow these physical processes is useful to refer the poststructuralist thought´s Gilles Deleuze and Felix Guattari, especially his text A Thousand Plateaus. Capitalism and Schizophrenia (1980 and concepts such as "rhizome" and "assemblage" and, above all, to use the creative and interpretative tool of "diagramme".Key wordsenergy, force, matter, form, Deleuze, Guattari

  12. Stair walking is more energizing than low dose caffeine in sleep deprived young women.

    Science.gov (United States)

    Randolph, Derek D; O'Connor, Patrick J

    2017-05-15

    The acute energizing effect of exercise and caffeine has never been examined in a single study of adults with chronic sleep deprivation but evidence from a study of this type could help individuals choose between these two common alertness-enhancing options. The apriori primary aim of this experiment was to compare the influence of 10-min of low-to-moderate intensity stair walking to the consumption of capsules containing 50mg caffeine or flour (placebo) on feelings of energy in physically active, college female caffeine users with chronic insufficient sleep. Effects on secondary outcomes related to feelings of energy also were assessed. A repeated measures crossover experiment was conducted with 18 college women (18-23years) who reported (i) daily caffeine consumption that was not extreme (40-400mg), (ii) typical leisure time physical activity that was not extreme (at least 2 weekly mild 15-min or longer bouts and no >5 strenuous 15-min or longer bouts), and (iii) sleeping memory (N-back), sustained attention (CPT), simple reaction time (SRT), and motivation to complete the cognitive tasks were measured before and after a 10-min exercise condition (20min seated rest followed by 10min of low-to-moderate intensity stair walking) and compared to both a caffeine condition (50mg caffeine capsule followed by 30min of seated rest) and a similar flour (placebo) capsule condition. Condition (exercise, caffeine, placebo)×Time (Baseline, Post-1, Post-2, and for mood Post-3) ANCOVAs (controlling for Condition order) tested the hypothesized effects. Condition×Time interactions showed that stair walking increased POMS-BF vigor at Post-1 compared to both placebo and caffeine. Other interactions were not significant. A brief bout of low-to-moderate intensity stair walking has transient energizing effects that exceed a low dose of caffeine for active young women with chronic insufficient sleep. Copyright © 2017 Elsevier Inc. All rights reserved.

  13. Análisis de sistema de conversores fluido-dinámicos de energía renovable para la Patagonia Austral de Argentina

    Directory of Open Access Journals (Sweden)

    Carlos Victor Manuel Labriola

    2014-06-01

    Full Text Available El potencial de energía en mares y océanos se puede clasificar de distintas formas, por ejemplo: * La energía de las mareas ó Mareomotriz * La energía de las corrientes marinas * La energía de las olas ó Undimotriz * La energía térmica oceánica (OTEC. De estas formas de energía oceánica, tres son posibles en la zona Atlántica de nuestra Patagonia Austral, la Mareomotriz, la Undimotriz y la de corrientes marinas. La Energía Mareomotriz se da desde Viedma hasta Tierra del Fuego con amplitudes de mareas de 4m hasta 20m, la Energía de las Olas se da en la costa de Chubut y Santa Cruz con potenciales de 10 a 30kW/m lineal de frente de ola y el aprovechamiento de las corrientes marinas se puede dar en lugares puntuales como ser la desembocadura del río Deseado o la de Río Gallegos. Para estas Fuentes de Energía se está realizando un banco de pruebas de modelos conversores de las mismas a Energía Eléctrica, en la Unidad Académica Caleta Olivia (UACO de la Universidad Nacional de la Patagonia Austral (UNPA. Este banco dispondrá de dos canales de ensayos hidrodinámicos uno para energía de las corrientes marinas y otro para las olas. El primero dispondrá de una bomba de circulación con velocidad de fluido variable entre 0 y 4m/s. El banco para olas tendrá un sistema de batido del agua para producir ondas de amplitud y período variable. Además se están dimensionando dos modelos de conversores de energía oceánica. Uno es una turbina, tipo eólica sumergida y el otro modelo es de tubo electromecánico oscilante como conversor energético de las olas.

  14. Spectral properties and associated plasma energization by magnetosonic waves in the Earth's magnetosphere: Particle-in-cell simulations

    Science.gov (United States)

    Sun, Jicheng; Gao, Xinliang; Lu, Quanming; Chen, Lunjin; Liu, Xu; Wang, Xueyi; Tao, Xin; Wang, Shui

    2017-05-01

    In this paper, we perform a 1-D particle-in-cell (PIC) simulation model consisting of three species, cold electrons, cold ions, and energetic ion ring, to investigate spectral structures of magnetosonic waves excited by ring distribution protons in the Earth's magnetosphere, and dynamics of charged particles during the excitation of magnetosonic waves. As the wave normal angle decreases, the spectral range of excited magnetosonic waves becomes broader with upper frequency limit extending beyond the lower hybrid resonant frequency, and the discrete spectra tends to merge into a continuous one. This dependence on wave normal angle is consistent with the linear theory. The effects of magnetosonic waves on the background cold plasma populations also vary with wave normal angle. For exactly perpendicular magnetosonic waves (parallel wave number k|| = 0), there is no energization in the parallel direction for both background cold protons and electrons due to the negligible fluctuating electric field component in the parallel direction. In contrast, the perpendicular energization of background plasmas is rather significant, where cold protons follow unmagnetized motion while cold electrons follow drift motion due to wave electric fields. For magnetosonic waves with a finite k||, there exists a nonnegligible parallel fluctuating electric field, leading to a significant and rapid energization in the parallel direction for cold electrons. These cold electrons can also be efficiently energized in the perpendicular direction due to the interaction with the magnetosonic wave fields in the perpendicular direction. However, cold protons can be only heated in the perpendicular direction, which is likely caused by the higher-order resonances with magnetosonic waves. The potential impacts of magnetosonic waves on the energization of the background cold plasmas in the Earth's inner magnetosphere are also discussed in this paper.

  15. La elasticidad de la demanda por electricidad y la política energética

    Directory of Open Access Journals (Sweden)

    Alexander Galetovic

    2010-01-01

    Full Text Available En el análisis y la práctica de la política energética se suele suponer que la elasticidad de la demanda por energía eléctrica es irrelevante. Este trabajo muestra que durante episodios de escasez de energía una “pequeña” elasticidad basta para generar caídas “grandes” de la probabilidad de déficit y del costo del abastecimiento eléctrico. Esto se debe a que en la vecindad de la capacidad del sistema, la oferta de energía de corto plazo es cercana a vertical. Ilustramos nuestro punto cuantitativamente simulando la operación esperada del sistema eléctrico chileno durante los años de ajuste a la crisis causada por los cortes de gas argentinos, el periodo 2006-2010. Mostramos que el aumento de los precios causado por el retraso de las inversiones y los cortes de gas argentino, combinado con una “pequeña” elasticidad de la demanda mensual por energía (0.0548 en valor absoluto eran suficientes para reducir mucho la probabilidad de déficit mensual y retornarla a niveles normales. Más aún, si se soslaya el efecto de los mayores precios en el consumo, el costo marginal se sobreestima en 32% y el costo de operación esperado en 41 por ciento.

  16. Fundamental processes in the expansion, energization, and coupling of single- and multi-Ion plasmas in space: Laboratory simulation experiments

    Science.gov (United States)

    Szuszczewicz, E. P.; Bateman, T. T.

    1996-01-01

    We have conducted a laboratory investigation into the physics of plasma expansions and their associated energization processes. We studied single- and multi-ion plasma processes in self-expansions, and included light and heavy ions and heavy/light mixtures to encompass the phenomenological regimes of the solar and polar winds and the AMPTE and CRRES chemical release programs. The laboratory experiments provided spatially-distributed time-dependent measurements of total plasma density, temperature, and density fluctuation power spectra with the data confirming the long-theorized electron energization process in an expanding cloud - a result that was impossible to determine in spaceborne experiments (as e.g., in the CRRES program). These results provided the missing link in previous laboratory and spaceborne programs. confirming important elements in our understanding of such solar-terrestrial processes as manifested in expanding plasmas in the solar wind (e.g., CMES) and in ionospheric outflow in plasmaspheric fluctuate refilling after a storm. The energization signatures were seen in an entire series of runs that varied the ion species (Ar', Xe', Kr' and Ne'), and correlative studies included spectral analyses of electrostatic waves collocated with the energized electron distributions. In all cases wave energies were most intense during the times in which the suprathermal populations were present, with wave intensity increasing with the intensity of the suprathermal electron population. This is consistent with theoretical expectations wherein the energization process is directly attributable to wave particle interactions. No resonance conditions were observed, in an overall framework in which the general wave characteristics were broadband with power decreasing with increasing frequency.

  17. A Comparison of Fishes and Invertebrates Living in the Vicinity of Energized and Unenergized Submarine Power Cables and Natural Sea Floor off Southern California, USA

    Directory of Open Access Journals (Sweden)

    Milton S. Love

    2017-01-01

    Full Text Available Increasing reliance on deep-water renewable energy has increased concerns about the effects of the electromagnetic fields (EMFs generated by submarine power cables on aquatic organisms. Off southern California, we conducted surveys of marine organisms living around energized and unenergized submarine power cables and nearby sea floor during 2012–2014 at depths between 76 and 213 m. In general, EMFs declined to background levels about one meter from the cable. We found no statistical difference in species composition between the fish assemblages along the energized and unenergized cables. The natural habitat community statistically differed from both energized and unenergized cable communities. Within species (or species groups, we found no differences in densities between energized and unenergized cables. Total fish densities were significantly higher around the cables than over the natural habitat. We found that invertebrate communities were structured by habitat type and depth and, similar to the fishes, there was no statistical difference between the energized and unenergized cables. Individually, the densities of four invertebrate species or species groups (Metridium farcimen, Luidia spp., unidentified black Crinoidea, and Urticina spp. differed between energized and unenergized cables, but this difference was not significant across all depth strata. The invertebrate community inhabiting the natural habitat strongly differed from the energized and unenergized cable community exhibiting the fewest species and individuals.

  18. Avaliação da eficiência energética em uma indústria de painéis compensado

    OpenAIRE

    Silva, Dimas Agostinho da

    2013-01-01

    Este trabalho trata do perfil e do uso de energia em uma indústria de painéis compensado no Brasil. O seu objetivo geral é corroborar para a melhoria da competitividade da indústria de compensado nacional. Especificamente visou conhecer o perfil do consumo energético na indústria, avaliar possibilidade de ganhos de eficiência no componente energético do processo produtivo e disponibilizar modelos matemáticos de consumo energético aplicado às indústrias de painéis compensado. O trabalho foi de...

  19. Producción de A.C.S. y climatización de una vivienda unifamiliar con energía geotérmica

    OpenAIRE

    Martínez Doce, Rubén

    2014-01-01

    El objetivo de este proyecto fin de carrera es el de realizar un diseño de una instalación para la producción de agua caliente sanitaria (A.C.S.), climatización de las estancias y de una piscina cubierta, de una vivienda unifamiliar mediante energía geotérmica, con el fin de proporcionar un ahorro energético utilizando una energía limpia. Ingeniería Industrial Industria Ingeniaritza

  20. Gobernanza global y evolución de las energías renovables en el sur. Objetivos políticos y estructuras de gobernanza

    OpenAIRE

    Wolfgang Hein; Daniela García Sánchez; Lars Holstenkamp

    2013-01-01

    El desarrollo de la gobernanza global de las energías renovables comparte similitudes y diferencias con otros sectores de la gobernanza global. La proliferación de organizaciones en el sector resalta el importante compromiso de varios actores con el fomento de energías renovables y, por otro lado, produce problemas de coordinación para alcanzar un efecto óptimo e influir sobre el avance de las energías renovables, particularmente en países en desarrollo.

  1. Gobernanza global y evolución de las energías renovables en el sur. Objetivos políticos y estructuras de gobernanza

    Directory of Open Access Journals (Sweden)

    Wolfgang Hein

    2013-10-01

    Full Text Available El desarrollo de la gobernanza global de las energías renovables comparte similitudes y diferencias con otros sectores de la gobernanza global. La proliferación de organizaciones en el sector resalta el importante compromiso de varios actores con el fomento de energías renovables y, por otro lado, produce problemas de coordinación para alcanzar un efecto óptimo e influir sobre el avance de las energías renovables, particularmente en países en desarrollo.

  2. Estrategia de control de modelo predictivo para el despacho y almacenamiento de energía renovable en sistemas híbridos

    OpenAIRE

    Rosero Beltrán, Jorge Luis

    2012-01-01

    Actualmente la energía eléctrica es generada por fuentes que consumen combustibles fósiles y/o energía nuclear, con los consecuentes riesgos y da~nos al medio ambiente que esto representa. El aumento en los precios internacionales del petróleo y su inevitable agotamiento,la demanda de grandes cantidades de energía y el envejecimiento de las redes actuales, han hecho que en los últimos años se de un importante impulso y desarrollo a la generación de electricidad basada en fuentes renovables...

  3. Estudio de la eficiencia energética en el sector residencial ecuatoriano y definición de propuestas de mejora desde el ámbito normativo

    OpenAIRE

    Ortega Zuñiga, María Luisa

    2017-01-01

    El trabajo de tesis consiste en el estudio de la eficiencia energética en el sector residencial ecuatoriano y la definición de propuestas de mejora desde el ámbito normativo. Los efectos del crecimiento insostenible de la demanda energética que causa al medio ambiente genera la necesidad de tomar conciencia y acciones que minimicen su consumo. El trabajo Final de Master, está enfocado a analizar parte de estas causas, relacionadas con el consumo energético del sector residencial en Ecuador...

  4. Barreras y oportunidades para el desarrollo de comunidades energéticas sostenibles en España. Estudio comparativo con Estados Unidos y Alemania

    OpenAIRE

    Romero Rubio, María del Carmen

    2017-01-01

    Las comunidades energéticas sostenibles son organizaciones en las que sus miembros se implican fuertemente para gestionar su propia energía, generarla con la máxima eficiencia y utilizar fuentes renovables. Estas comunidades aprovechan, en la medida de lo posible, los recursos locales de que disponen (energía solar, eólica, biomasa, etc.), con el fin de aumentar su autonomía y disminuir la dependencia de suministros externos. Dentro de un sistema de generación distribuida, las comunidades...

  5. Influencia del uso ineficiente de energía eléctrica en la competitividad de las empresas textiles peruanas: 2007 - 2008

    OpenAIRE

    Ríos Ballesteros, Julio

    2010-01-01

    Objetivo: Determinar si la inadecuada elección de la opción tarifaria, el exceso de consumo de energía reactiva y la falta de análisis del comportamiento de consumo (diagrama de carga) constituyen causas de ineficiencia en el consumo de energía eléctrica. Método: Mediante un diseño explicativo experimental se analizaron las causas que originan ineficiencia en el consumo de energía eléctrica en las empresas textiles peruanas. Se seleccionó una muestra de 77 empresas del sur de la capital, que ...

  6. The use of iron charge state changes as a tracer for solar wind entry and energization within the magnetosphere

    Directory of Open Access Journals (Sweden)

    T. A. Fritz

    Full Text Available The variation of the charge state of iron [Fe] ions is used to trace volume elements of plasma in the solar wind into the magnetosphere and to determine the time scales associated with the entry into and the action of the magnetospheric energization process working on these plasmas. On 2–3 May 1998 the Advanced Composition Explorer (ACE spacecraft located at the L1 libration point observed a series of changes to the average charge state of the element Fe in the solar wind plasma reflecting variation in the coronal temperature of their original source. Over the period of these two days the average Fe charge state was observed to vary from + 15 to + 6 both at the Polar satellite in the high latitude dayside magnetosphere and at ACE. During a period of southward IMF the observations at Polar inside the magnetosphere of the same Fe charge state were simultaneous with those at ACE delayed by the measured convection speed of the solar wind to the subsolar magnetopause. Comparing the phase space density as a function of energy at both ACE and Polar has indicated that significant energization of the plasma occurred on very rapid time scales. Energization at constant phase space density by a factor of 5 to 10 was observed over a range of energy from a few keV to about 1 MeV. For a detector with a fixed energy threshold in the range from 10 keV to a few hundred keV this observed energization will appear as a factor of ~103 increase in its counting rate. Polar observations of very energetic O+ ions at the same time indicate that this energization process must be occurring in the high latitude cusp region inside the magnetosphere and that it is capable of energizing ionospheric ions at the same time.

    Key words. Magnetospheric physics (magnetopause, cusp, and boundary layers; magnetospheric configuration and dynamics; solar wind-magnetosphere interactions

  7. Evaluación energética y validación matemática de un sistema de conversión de energía por rozamiento

    OpenAIRE

    Barona Díaz, Santiago Xavier

    2016-01-01

    El presente trabajo, consiste en la Evaluación Energética y validación Matemática de un nuevo dispositivo de calentamiento, que aprovecha la alta energía calórica producida por la fricción y el aplastamiento de un anillo cilíndrico de aleación Cu-Sn. En este proceso de transformación mecánico térmica, a temperaturas de trabajo sobre los 800ºC intervienen características tales como el área de la pared conductiva, torque, velocidad de rotación, fuerza axial de compresión, tipo de materiales, qu...

  8. Test-Anchored Vibration Response Predictions for an Acoustically Energized Curved Orthogrid Panel with Mounted Components

    Science.gov (United States)

    Frady, Gregory P.; Duvall, Lowery D.; Fulcher, Clay W. G.; Laverde, Bruce T.; Hunt, Ronald A.

    2011-01-01

    rich body of vibroacoustic test data was recently generated at Marshall Space Flight Center for component-loaded curved orthogrid panels typical of launch vehicle skin structures. The test data were used to anchor computational predictions of a variety of spatially distributed responses including acceleration, strain and component interface force. Transfer functions relating the responses to the input pressure field were generated from finite element based modal solutions and test-derived damping estimates. A diffuse acoustic field model was applied to correlate the measured input sound pressures across the energized panel. This application quantifies the ability to quickly and accurately predict a variety of responses to acoustically energized skin panels with mounted components. Favorable comparisons between the measured and predicted responses were established. The validated models were used to examine vibration response sensitivities to relevant modeling parameters such as pressure patch density, mesh density, weight of the mounted component and model form. Convergence metrics include spectral densities and cumulative root-mean squared (RMS) functions for acceleration, velocity, displacement, strain and interface force. Minimum frequencies for response convergence were established as well as recommendations for modeling techniques, particularly in the early stages of a component design when accurate structural vibration requirements are needed relatively quickly. The results were compared with long-established guidelines for modeling accuracy of component-loaded panels. A theoretical basis for the Response/Pressure Transfer Function (RPTF) approach provides insight into trends observed in the response predictions and confirmed in the test data. The software developed for the RPTF method allows easy replacement of the diffuse acoustic field with other pressure fields such as a turbulent boundary layer (TBL) model suitable for vehicle ascent. Structural responses

  9. Characteristics of high altitude oxygen ion energization and outflow as observed by Cluster: a statistical study

    Energy Technology Data Exchange (ETDEWEB)

    Nilsson, H.; Waara, M.; Arvelius, S.; Yamauchi, M.; Lundin, R. [Inst. of Space Physics, Kiruna (Sweden); Marghitu, O. [Max-Planck-Inst. fuer Extraterrestriche Physik, Garching (Germany); Inst. for Space Sciences, Bucharest (Romania); Bouhram, M. [Max-Planck-Inst. fuer Extraterrestriche Physik, Garching (Germany); CETP-CNRS, Saint-Maur (France); Hobara, Y. [Inst. of Space Physics, Kiruna (Sweden); Univ. of Sheffield, Sheffield (United Kingdom); Reme, H.; Sauvaud, J.A.; Dandouras, I. [Centre d' Etude Spatiale des Rayonnements, Toulouse (France); Balogh, A. [Imperial Coll. of Science, Technology and Medicine, London (United Kingdom); Kistler, L.M. [Univ. of New Hampshire, Durham (United States); Klecker, B. [Max-Planck-Inst. fuer Extraterrestriche Physik, Garching (Germany); Carlson, C.W. [Space Science Lab., Univ. of California, Berkeley (United States); Bavassano-Cattaneo, M.B. [Ist. di Fisica dello Spazio Interplanetario, Roma (Italy); Korth, A. [Max-Planck-Inst. fuer Sonnensystemforschung, Katlenburg-Lindau (Germany)

    2006-07-01

    The results of a statistical study of oxygen ion outflow using cluster data obtained at high altitude above the polar cap is reported. Moment data for both hydrogen ions (H{sup +}) and oxygen ions (O{sup +}) from 3 years (2001-2003) of spring orbits (January to May) have been used. The altitudes covered were mainly in the range 5-12 R{sub E} geocentric distance. It was found that O{sup +} is significantly transversely energized at high altitudes, indicated both by high perpendicular temperatures for low magnetic field values as well as by a tendency towards higher perpendicular than parallel temperature distributions for the highest observed temperatures. The O{sup +} parallel bulk velocity increases with altitude in particular for the lowest observed altitude intervals. O{sup +} parallel bulk velocities in excess of 60 km s{sup -1} were found mainly at higher altitudes corresponding to magnetic field strengths of less than 100 nT. For the highest observed parallel bulk velocities of O{sup +} the thermal velocity exceeds the bulk velocity, indicating that the beam-like character of the distribution is lost. The parallel bulk velocity of the H{sup +} and O{sup +} was found to typically be close to the same throughout the observation interval when the H{sup +} bulk velocity was calculated for all pitch-angles. When the H{sup +} bulk velocity was calculated for upward moving particles only the H{sup +} parallel bulk velocity was typically higher than that of O{sup +}. The parallel bulk velocity is close to the same for a wide range of relative abundance of the two ion species, including when the O{sup +} ions dominates. The thermal velocity of O{sup +} was always well below that of H{sup +}. Thus perpendicular energization that is more effective for O{sup +} takes place, but this is not enough to explain the close to similar parallel velocities. Further parallel acceleration must occur. The results presented constrain the models of perpendicular heating and parallel

  10. Characteristics of high altitude oxygen ion energization and outflow as observed by Cluster: a statistical study

    Directory of Open Access Journals (Sweden)

    H. Nilsson

    2006-05-01

    Full Text Available The results of a statistical study of oxygen ion outflow using Cluster data obtained at high altitude above the polar cap is reported. Moment data for both hydrogen ions (H+ and oxygen ions (O+ from 3 years (2001-2003 of spring orbits (January to May have been used. The altitudes covered were mainly in the range 5–12 RE geocentric distance. It was found that O+ is significantly transversely energized at high altitudes, indicated both by high perpendicular temperatures for low magnetic field values as well as by a tendency towards higher perpendicular than parallel temperature distributions for the highest observed temperatures. The O+ parallel bulk velocity increases with altitude in particular for the lowest observed altitude intervals. O+ parallel bulk velocities in excess of 60 km s-1 were found mainly at higher altitudes corresponding to magnetic field strengths of less than 100 nT. For the highest observed parallel bulk velocities of O+ the thermal velocity exceeds the bulk velocity, indicating that the beam-like character of the distribution is lost. The parallel bulk velocity of the H+ and O+ was found to typically be close to the same throughout the observation interval when the H+ bulk velocity was calculated for all pitch-angles. When the H+ bulk velocity was calculated for upward moving particles only the H+ parallel bulk velocity was typically higher than that of O+. The parallel bulk velocity is close to the same for a wide range of relative abundance of the two ion species, including when the O+ ions dominates. The thermal velocity of O+ was always well below that of H+. Thus perpendicular energization that is more effective for O+ takes place, but this is not enough to explain the close to similar parallel velocities. Further

  11. Characteristics of high altitude oxygen ion energization and outflow as observed by Cluster: a statistical study

    Directory of Open Access Journals (Sweden)

    H. Nilsson

    2006-05-01

    Full Text Available The results of a statistical study of oxygen ion outflow using Cluster data obtained at high altitude above the polar cap is reported. Moment data for both hydrogen ions (H+ and oxygen ions (O+ from 3 years (2001-2003 of spring orbits (January to May have been used. The altitudes covered were mainly in the range 5–12 RE geocentric distance. It was found that O+ is significantly transversely energized at high altitudes, indicated both by high perpendicular temperatures for low magnetic field values as well as by a tendency towards higher perpendicular than parallel temperature distributions for the highest observed temperatures. The O+ parallel bulk velocity increases with altitude in particular for the lowest observed altitude intervals. O+ parallel bulk velocities in excess of 60 km s-1 were found mainly at higher altitudes corresponding to magnetic field strengths of less than 100 nT. For the highest observed parallel bulk velocities of O+ the thermal velocity exceeds the bulk velocity, indicating that the beam-like character of the distribution is lost. The parallel bulk velocity of the H+ and O+ was found to typically be close to the same throughout the observation interval when the H+ bulk velocity was calculated for all pitch-angles. When the H+ bulk velocity was calculated for upward moving particles only the H+ parallel bulk velocity was typically higher than that of O+. The parallel bulk velocity is close to the same for a wide range of relative abundance of the two ion species, including when the O+ ions dominates. The thermal velocity of O+ was always well below that of H+. Thus perpendicular energization that is more effective for O+ takes place, but this is not enough to explain the close to similar parallel velocities. Further parallel acceleration must occur. The results presented constrain the models of perpendicular heating and parallel acceleration. In particular centrifugal acceleration of the outflowing ions, which may

  12. Distribución de energía y macronutrientes en hogares colombianos

    Directory of Open Access Journals (Sweden)

    Víctor A. Ardila

    2013-06-01

    Full Text Available Introducción. Conocer la distribución del consumo dietético en el hogar es útil para establecer lapolítica alimentaria. Objetivos. Estimar la distribución de la energía y los macronutrientes en hogares colombianos, según el parentesco. Materiales y métodos. Se aplicaron dos cuestionarios sobre el consumo dietético de las últimas 24 horas (24 Hours Dietary Recall, R24H en 1.505 sujetos residentes en 432 hogares. Se calcularon la ingestión usual para cada individuo, la ingestión agregada para cada hogar y el porcentaje de participación de los integrantes del hogar. La participación en el consumo en el hogar se ajustó en modelos lineales por edad, sexo, índice de masa corporal, necesidad de energía, nivel socioeconómico, escolaridad y tamaño del hogar. Resultados. El jefe del hogar participa en promedio en 27,4 % (IC95%: 26,5-28,2 del total de laenergía, sin diferencia por sexo o si aporta a los ingresos del hogar o no. La participación de los sujetos sin parentesco, 30,3 % (IC95%: 25,3-35,3, y de los hermanos del jefe, 26,0% (IC95%: 22,7-29,3, es equivalente a la del jefe. Al ajustar la participación, el nieto cobra importancia, 29,8% (IC95%:27,4-30,9. Los hombres participan más que las mujeres (p<0,05. Aun en hogares pequeños, la participación es menor si el nivel económico es bajo y reciben ayuda alimentaria (p<0,05. Conclusión. Surge la necesidad de una intervención cultural con fines nutricionales para modificarlos principios de contribución, necesidad, equidad y demanda, a la luz de las estructuras de poder y autoridad. Se evidencia desigualdad en la distribución.   doi: http://dx.doi.org/10.7705/biomedica.v33i2.1451

  13. La Energía del Cerebro Humano Autolimita su Poder Computacional

    Directory of Open Access Journals (Sweden)

    Mario Camacho Pinto

    1990-08-01

    Full Text Available

    Los expertos en informática no consideran apropiado seguir preguntando cuántos Mips o cuántos Megaflops constituyen la capacidad de ejecución del cerebro a ejemplo de un Supercomputador Cray o de un IBM Pc, sino cuántas operaciones computacionales puede ejecutar el encéfalo en fa unidad de tiempo o sea su poder computacional.

    El enfoque neurofisiológico involucra tres aspectos contributorios para una respuesta positiva, a saber:

    l. Poder computacional de las Synapsis intemeuronales.
    2. Poder computacional de la retina como punto de referencia.
    3. Medición de la energía total gastada por el cerebro en la unidad de tiempo.

    l. Poder computacional de las Synapsis.
    Engloba así mismo 3 premisas a saber:

    a. El cerebro no puede “computar” si la programación de las señales NO se efectúa mediante el transporte de una Synapsis a la siguiente por el sofisticado mecanismo electroquímico que requiere una determinada cantidad de energía que limita su poder, como veremos adelante.

    b. Este transporte toma tiempo que ha sido posible calcular en relación con la distancia total que todos los impulsos nerviosos tienen que recorrer, tiempo que se ha estimado en un segundo por cada diez impulsos.

    c. El número de Synapsis actuantes se calcula en 10 15.

    Así el total de “operaciones” será el resultado de la relación del número de Synapsis en juego con la distancia que tenga que recorrer el impulso nervioso y su velocidad de operancia.

    Entonces como hay aproximadamente 1015 Synapsis operando a 10 impulsos por segundo, el resultado crudo sería evaluado en 1016 operaciones synapsiales del cerebro en la unidad de tiempo...

  14. La Energía como una Herramienta de Desarrollo en Zonas Rurales no Iterconectadas

    Directory of Open Access Journals (Sweden)

    Yony Fernando Ceballos

    2015-01-01

    Full Text Available En Colombia, como en otros países en desarrollo, las comunidades pertenecientes a zonas rurales no interconectadas son vulnerables; el escaso nivel educativo, el poco acceso a servicios públicos y la deficiente explotación de los recursos naturales ha impedido el correcto desarrollo social y tecnológico de las mismas, haciendo cada vez mayor el éxodo de personas a centros urbanos, en búsqueda de oportunidades no garantizadas. Diferentes esfuerzos se han realizado para superar esta situación, con el compromiso de entidades gubernamentales y de las mismas comunidades para involucradas, buscando un desarrollo social y humano. Sin embargo, los resultados de dichos esfuerzos son diversos y no siempre los mejores, dado el nivel de apropiación y mantenimiento de las tecnologías mismas, además de la conflictividad que aqueja dichas poblaciones rurales. En conjunto, tales situaciones impiden un manejo sostenible de las diversas tecnologías energéticas. Para analizar este problema desde un enfoque holístico, el pensamiento sistémico y más específicamente la dinámica de sistemas [7], reúne todas las características necesarias para realizar un análisis exhaustivo, que permita involucrar las posibles relaciones entre los entes que conforman el problema de la evolución de las tecnologías energéticas en una comunidad rural, los impactos de la misma en tal región y la forma en la cual las políticas públicas ayudan a una correcta utilización de la tecnología. Tal análisis, permite la identificación de los problemas más significativos, la evaluación de políticas y la simulación del comportamiento de las mismas a través del tiempo. Dada la implementación del problema y el proceso de solución, se observará de manera clara la forma en la cual se deben enfocar los esfuerzos institucionales, la construcción de capital social y humano, además de la manera en la cual se debe llevar a cabo el proceso de aprendizaje tecnológico.

  15. Caracterización energética de un sistema mixto de recuperación de energía en instalaciones de climatización. // Energetic characterization of an energy mixed recovery system on climatization facilities.

    Directory of Open Access Journals (Sweden)

    M. A. Alvarez-Guerra Plasencia

    2001-07-01

    Full Text Available Se realiza la caracterización energética de un sistema mixto de recuperación de energía del aire de extracción de localesclimatizados compuesto por dos recuperadores dispuestos en serie en el conducto de impulsión, recuperadores del tipotubos de calor (Heat Pipe y evaporativo indirecto de placas. Para ello se desarrolla un programa experimental encaminadoa evaluar la influencia de factores como la temperatura, humedad relativa y caudal del aire exterior, flujo de agua y % derecirculación del aire de retorno sobre las características fundamentales definidas para el sistema mixto: Flujo de calorrecuperado, eficacia térmica y coeficiente de prestaciones.Palabras claves: Recuperación de energía, tubos de calor, humedad relativa, flujo de aire primario,recirculación de aire de retorno._______________________________________________________________________________AbstractThe energetic characterisation of a mixed system of energy recovery from exhaust room air, compound by recuperators oftwo types: heat pipe and indirect evaporative with plates type, have been developed. For this purpose an experimentalprogram has been created to evaluate the influence of different parameters such as: Temperature, Relative Humidity,Primary Air Flow, Water Flow and the Secondary Air Recirculation Ratio on it’s thermal performance.Key words: Energy recovery, heat pipes, relative humidity, primary air flow, secondary air recirculation.

  16. Obtención de energía de las olas empleando materiales piezoeléctricos

    OpenAIRE

    González Díaz, Mario

    2017-01-01

    RESUMEN: En este trabajo se estimará la viabilidad de algunos sistemas, basados en el empleo de materiales piezoeléctricos, para la obtención de energía de las olas. Se calculará la energía obtenida con un modelo matemático para calcular la carga y voltaje generados en los elementos piezoeléctricos al interaccionar con las olas, teniendo en cuenta las teorías clásicas de elasticidad mecánica, la teoría lineal de Airy para las olas, el circuito eléctrico y una descripción fenomenológica del ef...

  17. Balance de nitrógeno y digestibilidad energética en ratas alimentadas con manteca de freidura

    Directory of Open Access Journals (Sweden)

    Jiménez, S.

    1992-06-01

    Full Text Available This study was carried out during 90 days in order to know the effect of frying lard on the energy digestibility and nitrogen bioavailability. A significant decrease occurred on energy utilization of the diets prepared with frying lard (52 frying times. Nitrogen bioutilization on growing rats was also affected.

    Se realiza un estudio de 90 días de duración en ratas con el fin de conocer posibles efectos de las grasas de freidura sobre el coeficiente de digestibilidad energética y la biodisponibilidad del nitrógeno. Se observó una disminución de la utilización de la energía de la dieta con el consumo reiterado de grasas con 52 freiduras y se encontró afectada la bioutilización del nitrógeno del organismo en crecimiento.

  18. Otimização energética de sistemas de arejamento e agitação

    OpenAIRE

    Feliciano, Nicole Danielle Manteigas

    2014-01-01

    Este estágio foi desenvolvido na Águas do Oeste, no período compreendido entre outubro de 2013 e julho de 2014, tendo como objetivo a otimização energética dos sistemas de arejamento e agitação. A importância deste tema deve-se ao fato de estes sistemas serem responsáveis por cerca de 70% do consumo de uma ETAR. Identificaram-se possíveis equipamentos a intervencionar e através de pesquisa bibliográfica e consulta de experts possíveis soluções em termos de eficiência energética, sendo apre...

  19. Electron Energization and Mixing Observed by MMS in the Vicinity of an Electron Diffusion Region During Magnetopause Reconnection

    Science.gov (United States)

    Chen, Li-Jen; Hesse, Michael; Wang, Shan; Gershman, Daniel; Ergun, Robert; Pollock, Craig; Torbert, Roy; Bessho, Naoki; Daughton, William; Dorelli, John; hide

    2016-01-01

    Measurements from the Magnetospheric Multiscale (MMS) mission are reported to show distinct features of electron energization and mixing in the diffusion region of the terrestrial magnetopause reconnection. At the ion jet and magnetic field reversals, distribution functions exhibiting signatures of accelerated meandering electrons are observed at an electron out-of-plane flow peak. The meandering signatures manifested as triangular and crescent structures are established features of the electron diffusion region (EDR). Effects of meandering electrons on the electric field normal to the reconnection layer are detected. Parallel acceleration and mixing of the inflowing electrons with exhaust electrons shape the exhaust flow pattern. In the EDR vicinity, the measured distribution functions indicate that locally, the electron energization and mixing physics is captured by two-dimensional reconnection, yet to account for the simultaneous four-point measurements, translational invariant in the third dimension must be violated on the ion-skin-depth scale.

  20. Tendencias de Tarificación en el Suministro de Energía Eléctrica

    Directory of Open Access Journals (Sweden)

    Hernando Durán Castro

    2015-03-01

    Full Text Available Se presenta un modelo de precios de energía eléctrica que permite a productores y consumidores operar como mercado. La demanda de energía eléctrica es variable en el tiempo y no es almacenable de un período a otro: se genera en el momento en que se demanda. Las tecnologías de generación (hidráulica, nuclear, térmica, etc. utilizan distintos combustibles y tienen costos diferentes de inversión en capacidad y de operación. El modelo minimiza la suma de ambos costos y garantiza que los productores obtengan un beneficio sobre la inversión en capacidad igual al WACC (Weighted Average Cost of Capital.

  1. Transverse ion energization and low-frequency plasma waves in the mid-altitude auroral zone - A case study

    Science.gov (United States)

    Peterson, W. K.; Shelley, E. G.; Boardsen, S. A.; Gurnett, D. A.; Ledley, B. G.; Sugiura, M.; Moore, T. E.

    1988-01-01

    Evidence of transverse ion energization at altitudes of several earth radii in the auroral zone was reexamined using several hundred hours of high-sensitivity and high-resolution plasma data obtained by the Dynamics Explorer 1 satellite. The data on particle environment encountered at midaltitudes in the auroral zone disclosed rapid variations in the values of total density, thermal structure, and composition of the plasma in the interval measured; the modes of low-frequency plasma waves also varied rapidly. It was not possible to unambiguously identify in these data particle and wave signature of local transverse ion energization; however, many intervals were found where local transverse ion heating was consistent with the observations.

  2. Sensoriamento remoto como subsídio à modelagem do balanço energético superficial

    Directory of Open Access Journals (Sweden)

    Vassiliki Terezinha Galvão Boulomytis

    2010-09-01

    Full Text Available O balanço energético superficial interfere no funcionamento do sistema terrestre através da relação existente entre a água e a energia solar e do modo como ocorre o seu processo de partição. Para a sua estimativa, modelagens vêm sendo realizadas utilizando-se de um ou mais sensores com diferentes resoluções, a fim de se obter dados com resoluções temporal e espacial adequadas a uma escala local. Neste estudo serão apresentados modelos para estimar a evapotranspiração e outros parâmetros biofísicos através do balanço energético superficial com a utilização dos sensores MODIS e AMSR-E.

  3. Desarrollo de un modelo de determinación de cash-flows para un proyecto de energía eólica

    OpenAIRE

    Irene Clara Pisón Fernández; Félix Puime Guillén; Miguel Ángel Crespo Cibrán

    2015-01-01

    En este trabajo se analiza la problemática asociada a la producción de energía eléctrica de origen renovable, y se ofrece un modelo de definición de las variables en las que se apoya el plan de negocio de energía eólica. El plan de viabilidad muestra que los cash-flows para el accionista obtenidos en este tipo de proyectos permiten afrontar las inversiones futuras con una rentabilidad suficiente, que apunta al sector de energías renovables, y en particular al de energía eólica, como estratégi...

  4. Desarrollo de pigmentos cerámicos multifuncionales orientados a la mejora de la eficiencia energética en edificación

    OpenAIRE

    Aranzabe Basterrechea, Estíbaliz

    2017-01-01

    268 p. El sector de la edificación y en concreto la climatización de edificios es un sectorprioritario a la hora de implementar mejoras de eficiencia energética. Así lo demuestrala estrategia energética de la Unión Europea (objetivo 20-20-20) y la EstrategiaEnergética de Euskadi 2020 que establecen claras líneas de actuación entre las cuales seencuentra la reducción del consumo de energía en los edificios y en el hogar.La rehabilitación de edificios se presenta como una de las claves para ...

  5. Desarrollo de un modelo de determinación de cash-flows para un proyecto de energía eólica

    Directory of Open Access Journals (Sweden)

    Irene Clara Pisón Fernández

    2015-06-01

    Full Text Available En este trabajo se analiza la problemática asociada a la producción de energía eléctrica de origen renovable, y se ofrece un modelo de definición de las variables en las que se apoya el plan de negocio de energía eólica. El plan de viabilidad muestra que los cash-flows para el accionista obtenidos en este tipo de proyectos permiten afrontar las inversiones futuras con una rentabilidad suficiente, que apunta al sector de energías renovables, y en particular al de energía eólica, como estratégico dentro de la economía española de las próximas décadas.

  6. Estudio del aprovechamiento energético de los puntos de regulación de presión en la red de abastecimiento a Cartagena

    OpenAIRE

    Vera Morales, Carlos

    2015-01-01

    El actual sistema energético a nivel mundial está basado en la generación de energía a partir de combustibles fósiles como el petróleo, el carbón mineral y el gas. En la actualidad, la generación de energía a partir de estas materias primas se está replanteando por razones como la limitada disponibilidad de recursos. La Unión Europea tiene como objetivo prioritario la promoción de la electricidad generada a partir de fuentes de energía renovables. Esto se debe a razones dive...

  7. Física y química: 1 Bachillerato. Calor y principio de conservación de la energía

    OpenAIRE

    Carrascosa Alís, Jaime; Martínez Sala, Salvador; Martínez-Torregrosa, Joaquín

    1998-01-01

    Cuando la energía mecánica disminuye, los objetos se calientan. ¿Hay alguna relación entre los cambios en propiedades mecánicas y térmicas?. La termología (con su hipótesis del "calórico") y sus límites con la mecánica: ¿cómo explicar que aumente la temperatura de todos los cuerpos cuando hay rozamiento?. Los trabajos de Joule. Generalización de la conservación de la energía. ¿Si la energía siempre se conserva en un sistema aislado, por qué hablamos de "crisis energética"?. Análisis de las ca...

  8. Las energías renovables como oportunidad y desafío para el desarrollo territorial (Valle de Lerma, Salta – Argentina

    Directory of Open Access Journals (Sweden)

    Silvina Belmonte

    2014-03-01

    Full Text Available La evaluación de Energías Renovables se plantea en un contexto de Ordenamiento Territorial del Valle de Lerma (Salta como estrategia para el desarrollo regional y mejora de la calidad de vida y del ambiente. Herramientas de Evaluación Multi-Criterio, aplicaciones de Sistemas de Información Geográfica y técnicas participativas de consulta constituyen el sustento metodológico del trabajo. Los resultados se focalizan en tres puntos: diagnóstico territorial, evaluación del recurso energético y alternativas tecnológicas, y propuestas para la planificación y gestión. En el diagnóstico, las energías renovables fueron identificadas como opciones viables particularmente en cuestiones productivas y de acceso a servicios básicos. La potencialidad de los recursos renovables resultó alta en relación a la radiación solar y recurso hidráulico, moderado para el potencial eólico y de alta diversidad para el tema de biomasa. Entre las medidas de eficiencia y tecnologías evaluadas, surgieron como prioritarias: educación ambiental, planificación energética estratégica y variadas aplicaciones de energía solar (secaderos, invernaderos, arquitectura bioclimática, colectores de agua y cocinas. Entre las orientaciones para el desarrollo de políticas energéticas ‘más’ sustentables se destacaron: coordinación del sector energético con otros sectores y niveles de actuación en el marco de una planificación territorial integral, fortalecimiento de instituciones locales para la gestión energética, y superación de barreras – limitaciones a la transferencia de energías renovables y medidas de eficiencia energética a nivel local. Finalmente, en las conclusiones se plantea la importancia de valorar las energías renovables como oportunidad y desafío para promover procesos de ‘cambio’ en la región, en una concepción más comprometida con el ambiente y la sociedad.

  9. Cumbre de Viena: energía, polarización y búsqueda de liderazgos

    OpenAIRE

    Bermúdez, Ángel; Soriano, Juan Pablo

    2006-01-01

    La IV Cumbre Unión Europea – América Latina y el Caribe (UE-ALC), celebrada en Viena los días 11, 12 y 13 de mayo, estuvo marcada por una creciente polarización interna latinoamericana, por los problemas europeos para definir un liderazgo sobre el futuro del proyecto de integración y por la crisis global de energía.

  10. Agua y energía: producción hidroeléctrica en España

    OpenAIRE

    Cayetano Espejo Marín; Ramón García Marín

    2010-01-01

    La evolución de la energía hidroeléctrica en España en las últimas décadas ha sido siempre creciente, aunque la participación de ésta en el total de eléctrica producida ha ido disminuyendo. Las modernas tecnologías de regulación y control han aumentado la eficiencia de las centrales y del aprovechamiento del recurso agua.

  11. Agua y energía: producción hidroeléctrica en España

    Directory of Open Access Journals (Sweden)

    Cayetano Espejo Marín

    2010-01-01

    Full Text Available La evolución de la energía hidroeléctrica en España en las últimas décadas ha sido siempre creciente, aunque la participación de ésta en el total de eléctrica producida ha ido disminuyendo. Las modernas tecnologías de regulación y control han aumentado la eficiencia de las centrales y del aprovechamiento del recurso agua.

  12. Estudi energètic d'un cotxe híbrid elèctric

    OpenAIRE

    Cedó Olivé, Gerard

    2016-01-01

    L’objectiu del present estudi és analitzar i comprendre el comportament energètic d’un vehicle híbrid elèctric, mitjançant la creació i la simulació d’un model dinàmic utilitzant l’entorn de programació visual SIMULINK®, del programa informàtic MATLAB®.

  13. Avaliação de projetos de eficiência energética no segmento baixa renda

    OpenAIRE

    Oliveira, Felipe Conti de Souza

    2012-01-01

    O presente trabalho visa avaliar o resultado dos projetos de eficiência energética para o segmento baixa renda, comparando resultados de projetos de troca de equipamentos obsoletos por equipamentos novos e eficientes, com projeto de cunho educativo para o consumo eficiente de energia. Faz também parte do trabalho verificar os resultados das ações dos dois projetos combinados.

  14. Análisis económico y financiero de las empresas cotizadas pertenecientes al sector de las energías renovables

    OpenAIRE

    Rodríguez Regueiro, Luis Manuel

    2012-01-01

    Situados en este contexto, el objetivo de este Trabajo Fin de Master es ofrecer una visión del sector de las energías renovables, mediante el estudio de sus características y su funcionamiento, y analizar la situación económica y financiera que presentan las empresas cotizadas pertenecientes al sector de las energías renovables.

  15. Instalación eléctrica de una vivienda unifamiliar aislada mediante suministro de energías renovables

    OpenAIRE

    LOZANO VALLADOLID, FERNANDO

    2015-01-01

    [ES] Instalación eléctrica con grado de electrificación elevada de una vivienda unifamiliar aislada mediante suministro de energías renovables (solar, eólica, geotérmicas). Lozano Valladolid, F. (2015). Instalación eléctrica de una vivienda unifamiliar aislada mediante suministro de energías renovables. http://hdl.handle.net/10251/58751. TFGM

  16. Posibilidades de Generación de Energía en base al Potencial Geotérmico de la Península de Santa Elena.

    Directory of Open Access Journals (Sweden)

    Hernán E. Poveda Z.

    2015-10-01

    En este estudio, proponemos la posibilidad de utilizar esta energía natural para transformarla en electricidad. Aprovechando las condiciones de algunos de los afloramientos de manantiales de agua caliente y volcanes de lodo que existen en la provincia. Para lo cual hemos propuesto al Instituto Austriaco de tecnología, su asesoría y asistencia para proponer un proyecto al ministerio de electrificación y energías renovables.

  17. Desempenho termo-energético de edifícios residenciais em clima temperado

    Directory of Open Access Journals (Sweden)

    Márcia Cristina Pereira Tavares

    2016-12-01

    Full Text Available Este estudio trata de vincular los aspectos de la Arquitectura y la Térmica de los edificios para contribuir a la práctica de diseño que proporcionan un conjunto de información relacionada a las cuestiones de comodidad y el consumo de energía.  Obtenido en un proceso metodológico basado en un componente experimental (realización de monitoreo de verano e invierno en edificios residenciales en Lisboa con superficie acristalada superior al 60% de la fachada principal y un componente numérico (simulaciones térmicas que utilizan el programa dinámico EnergyPlus en un proceso que involucró la modelación y calibración de modelos geométricos representativos de tipologías frecuentes. Esto permitió la observación de diferentes parámetros con la posibilidad de comparar el rendimiento en un amplio espectro de soluciones actuales (soluciones Matriz bajo un clima típicamente mediterráneo, como el de la ciudad de Lisboa. De esta manera, se presenta un conjunto de resultados que demuestran la capacidad de diseñar y construir edificios de viviendas con diferentes áreas de vidrio, especialmente de grandes proporciones, en Clima Templado.

  18. Synergy of Stochastic and Systematic Energization of Plasmas during Turbulent Reconnection

    Science.gov (United States)

    Pisokas, Theophilos; Vlahos, Loukas; Isliker, Heinz

    2018-01-01

    The important characteristic of turbulent reconnection is that it combines large-scale magnetic disturbances (δ B/B∼ 1) with randomly distributed unstable current sheets (UCSs). Many well-known nonlinear MHD structures (strong turbulence, current sheet(s), shock(s)) lead asymptotically to the state of turbulent reconnection. We analyze in this article, for the first time, the energization of electrons and ions in a large-scale environment that combines large-amplitude disturbances propagating with sub-Alfvénic speed with UCSs. The magnetic disturbances interact stochastically (second-order Fermi) with the charged particles and play a crucial role in the heating of the particles, while the UCSs interact systematically (first-order Fermi) and play a crucial role in the formation of the high-energy tail. The synergy of stochastic and systematic acceleration provided by the mixture of magnetic disturbances and UCSs influences the energetics of the thermal and nonthermal particles, the power-law index, and the length of time the particles remain inside the energy release volume. We show that this synergy can explain the observed very fast and impulsive particle acceleration and the slightly delayed formation of a superhot particle population.

  19. The structure of high altitude O+ energization and outflow: a case study

    Directory of Open Access Journals (Sweden)

    H. Nilsson

    2004-07-01

    Full Text Available Multi-spacecraft observations from the CIS ion spectrometers on board the Cluster spacecraft have been used to study the structure of high-altitude oxygen ion energization and outflow. A case study taken from 12 April 2004 is discussed in more detail. In this case the spacecraft crossed the polar cap, mantle and high-altitude cusp region at altitudes between 4RE and 8RE and 2 of the spacecraft provided data. The oxygen ions were seen as a beam with narrow energy distribution, and increasing field-aligned velocity and temperature at higher altitude further in the upstream flow direction. The peak O+ energy was typically just above the highest energy of observed protons. The observed energies reached the upper limit of the CIS ion spectrometer, i.e. 38keV. Moment data from the spacecraft have been cross-correlated to determine cross-correlation coefficients, as well as the phase delay between the spacecraft. Structures in ion density, temperature and field-aligned flow appear to drift with the observed field-perpendicular drift. This, together with a velocity dispersion analysis, indicates that much of the structure can be explained by transverse heating well below the spacecraft. However, temperature isotropy and the particle flux as a function of field-aligned velocity are inconsistent with a single altitude Maxwellian source. Heating over extended altitude intervals, possibly all the way up to the observation point, seem consistent with the observations.

  20. Magnetic Field Generation, Particle Energization and Radiation at Relativistic Shear Boundary Layers

    Science.gov (United States)

    Liang, Edison; Fu, Wen; Spisak, Jake; Boettcher, Markus

    2015-11-01

    Recent large scale Particle-in-Cell (PIC) simulations have demonstrated that in unmagnetized relativistic shear flows, strong transverse d.c. magnetic fields are generated and sustained by ion-dominated currents on the opposite sides of the shear interface. Instead of dissipating the shear flow free energy via turbulence formation and mixing as it is usually found in MHD simulations, the kinetic results show that the relativistic boundary layer stabilizes itself via the formation of a robust vacuum gap supported by a strong magnetic field, which effectively separates the opposing shear flows, as in a maglev train. Our new PIC simulations have extended the runs to many tens of light crossing times of the simulation box. Both the vacuum gap and supporting magnetic field remain intact. The electrons are energized to reach energy equipartition with the ions, with 10% of the total energy in electromagnetic fields. The dominant radiation mechanism is similar to that of a wiggler, due to oscillating electron orbits around the boundary layer.

  1. The upstream escape of energized solar wind protons from the bow shock

    International Nuclear Information System (INIS)

    Greenstadt, E.W.

    1975-01-01

    Recently, there have been some systematic observations of backstreaming protons at the Earth's bow shock with parallel velocity components and total energies much too high to be associated with the usual long-period upstream waves or to be produced by Sonnerup's simple reflection process (Lin et al., 1974), and these protons (30-100keV) were attributed to some unknown acceleration mechanism in the upstream region. The observations of Lof et al. involved protons in high pitch angle, and, although their reasons for favoring an upstream acceleration were quite different, it may seem intuitive that high pitch angle particles would have difficulty escaping the shock, especially at large field-normal angles. Such an inference would superficially support the notion of energization outside the bow shock. It seems worthwhile therefore to examine the extent to which the geometry of individual particle motion alone might select among reflected particles those that can escape upstream and those that cannot. In this paper the geometry of escape is described and some simple numerical examples are worked out for a few special cases. It is found that protons with rather high energies and pitch angles can escape the shock at only marginally quasi-parallel field orientations (i.e., thetasub(nB) approximately 50 0 ), even if they have quite moderate speeds parallel to B. (Auth.)

  2. Modeling and Mitigation for High Frequency Switching Transients Due to Energization in Offshore Wind Farms

    Directory of Open Access Journals (Sweden)

    Yanli Xin

    2016-12-01

    Full Text Available This paper presents a comprehensive investigation on high frequency (HF switching transients due to energization of vacuum circuit breakers (VCBs in offshore wind farms (OWFs. This research not only concerns the modeling of main components in collector grids of an OWF for transient analysis (including VCBs, wind turbine transformers (WTTs, submarine cables, but also compares the effectiveness between several mainstream switching overvoltage (SOV protection methods and a new mitigation method called smart choke. In order to accurately reproduce such HF switching transients considering the current chopping, dielectric strength (DS recovery capability and HF quenching capability of VCBs, three models are developed, i.e., a user–defined VCB model, a HF transformer terminal model and a three-core (TC frequency dependent model of submarine cables, which are validated through simulations and compared with measurements. Based on the above models and a real OWF configuration, a simulation model is built and several typical switching transient cases are investigated to analyze the switching transient process and phenomena. Subsequently, according to the characteristics of overvoltages, appropriate parameters of SOV mitigation methods are determined to improve their effectiveness. Simulation results indicate that the user–defined VCB model can satisfactorily simulate prestrikes and the proposed component models display HF characteristics, which are consistent with onsite measurement behaviors. Moreover, the employed protection methods can suppress induced SOVs, which have a steep front, a high oscillation frequency and a high amplitude, among which the smart choke presents a preferable HF damping effect.

  3. A mixed methods study of emotional exhaustion: Energizing and depleting work within an innovative healthcare team.

    Science.gov (United States)

    Cain, Cindy L; Taborda-Whitt, Caitlin; Frazer, Monica; Schellinger, Sandra; White, Katie M; Kaasovic, Jason; Nelson, Brenda; Chant, Allison

    2017-11-01

    This mixed methods study documents emotional exhaustion experiences among care team members during the development of an innovative team approach for caring for adults with serious illness. A mixed methods study design was employed to examine depleting work experiences that may produce emotional exhaustion, and energizing aspects of the work that may increase meaningfulness of work, thus reducing emotional exhaustion. The population studied included team members involved in care for adults with serious illness (n = 18). Team members were surveyed quarterly over an 18-month period using the Maslach Burnout Inventory (MBI). The MBI measures burnout, defined as the inability to continue work because of the interactional toll of the work. Analyses of MBI data show that although overall levels of burnout are low, 89% of team members reported moderate/high levels of emotional exhaustion during at least one survey period. In order to understand the kinds of work experiences that may produce or ameliorate emotional exhaustion, qualitative interviews were also conducted with team members at the end of the 18-month period. Major qualitative findings indicate that disputes within the team, environmental pressures, and standardisation of meaningful work leave team members feeling depleted. Having authentic relationships with patients, working as a team, believing in the care model, and practicing autonomy and creativity help team members to restore their emotional energy. Supports for team members' well-being are critical for continued innovation. We conclude with recommendations for improving team members' well-being.

  4. Caracterización financiera de las empresas generadoras de energía colombianas (2005–2012

    Directory of Open Access Journals (Sweden)

    Amanda Lucía Restrepo Londoño

    2016-01-01

    Full Text Available El presente documento tiene como objetivo principal la caracterización desde el punto de vista financiero de las empresas de generación más representativas que transaron en bolsa entre los años 2005 a 2012. La generación de energía en Colombia se encuentra concentrada en cinco empresas de acuerdo con volúmenes de generación y ventas en los mercados regulado y no regulado. Estas empresas se caracterizaron a partir del análisis de indicadores financieros y correlaciones entre ellos, la demanda de energía y la entrada en operación de centrales de generación. Como resultado se evidencia la relación directa de la demanda de energía en el crecimiento de ingresos operacionales, inversiones en Propiedad, Planta y Equipo e indicadores financieros, además de una estructura financiera representada en activos fijos y financiación de largo plazo.

  5. Propuesta de mejora energética para una planta de producción de clinker

    Directory of Open Access Journals (Sweden)

    Leonardo Rodriguez Urrego

    2017-11-01

    Full Text Available El siguiente trabajo presenta un análisis de la eficiencia energética en la industria cementera y un ejemplo real en donde se proponen mejoras para disminuir considerablemente el consumo energético. El aumento de la eficiencia disminuye considerablemente el costo de la energía eléctrica, además de las emisiones de CO2 ayudando así al mantenimiento y la preservación del medio ambiente. El caso de estudio fue aplicado en la planta de producción de cemento de san Vicente del Raspeig operada por CEMEX en España. En este caso se analizó una sección de la planta de producción, donde se realiza la molienda y el ensacado de cemento. Se encontró que, al implementar las mejoras propuestas, el costo de producción disminuye y el punto de equilibrio con respecto a la implementación de estos nuevos equipos no era mayor a 5 años lo cual hace que estas mejoras sean factibles.

  6. Monitoreo energético experimental de vivienda unifamiliar compacta en un clima templado frio de Argentina

    Directory of Open Access Journals (Sweden)

    Celina Filippín

    Full Text Available En el presente trabajo se estudia el comportamiento térmico-energético de viviendas compactas entre medianeras implantadas en barrios residenciales de baja densidad en la ciudad de Santa Rosa, La Pampa, Argentina (latitud: 36º27'S y longitud: 64º27'W. Los objetivos son evaluar la temperatura interior y las condiciones de confort en invierno a través del monitoreo experimental y analizar el consumo histórico de gas natural en calefacción. Los resultados muestran que las viviendas compactas entre medianeras tienen un 50% menos de consumo de gas natural que la vivienda social unifamiliar en la misma región en estudio. El panorama energético de Argentina, la posibilidad de revisar Normativas y Códigos de Edificación, la tendencia del crecimiento de la construcción de viviendas en la región en estudio, el proceso de etiquetado de la edificación, entre otros aspectos, ameritan un análisis de la información de las características del stock de las edificios y de su performance energética. La creación de un protocolo de monitoreo armonizado de datos es imperativa.

  7. ENERGIA EÓLICA: uma fonte energética limpa e renovável em nosso meio

    Directory of Open Access Journals (Sweden)

    GABRIEL MOREIRA

    2011-07-01

    Full Text Available Segundo o IBGE, no ano de 2010, a população brasileira teve um crescimento de 1,12%. Tendo em vista que tal crescimento necessita de uma grande demanda energética, precisa-se de fontes alternativas. Um bom meio supressor é a energia eólica. Meio de energia renovável e limpa. Segundo o documentário, Energia Eólica: a caçada pelos ventos, exibido pela TV Zabelê: “É uma dádiva da natureza o fato da nossa região ter esse grande potencial eólico [...].” No entanto, sua instalação necessita-se de grandes investimentos. Tendo em vista este grande crescimento populacional o projeto de pesquisa Energia Eólica: Uma fonte energética limpa e renovável em nosso meio, tem como objetivo a produção de um pequeno campo de energia eólica, em uma biblioteca na escola Oswaldo Cruz, na cidade de Sinop, Mato Grosso. Desta forma temos a possibilidade de reduzir 70% do consumo energético convencional, proporcionando uma economia financeira considerável. A implantação deste projeto está prevista para o segundo semestre de 2014.

  8. Transverse ion energization and low-frequency plasma waves in the mid-altitude auroral zone: A case study

    International Nuclear Information System (INIS)

    Peterson, W.K.; Shelley, E.G.; Boardsen, S.A.; Gurnett, D.A.; Ledley, B.G.; Sugiura, M.; Moore, T.E.; Waite, J.H.

    1988-01-01

    The transport of ions from the ionosphere to the magnetosphere requires that ions acquire significant energy in directions both transverse and parallel to the magnetic field. There is a considerable body of experimental evidence that shows that transverse energization occurs over a wide range of altitudes on auroral field lines. Many recent analytical and simulation studies have addressed the microphysics involved in transverse ion energization. There are, however, remarkably few published high-resolution plasma and plasma wave observations obtained in the mid-altitude auroral region available to compare with the analytical and simulation studies. Several hundred hours of high-resolution plasma data obtained from the Dynamics Explorer 1 satellite have been surveyed. A wide variety of plasma environments that are difficult to simply characterize were found. We present here a comprehensive set of high-sensitivity, high-resolution plasma wave, ion, and magnetometer data obtained from an evening auroral zone crossing at r/R/sub E/∼3. The total density, thermal structure, and composition of the plasma in this representative interval varied rapidly, as did the character (mode) of low-frequency plasma waves observed. We did not find an unambiguous particle and wave signature of local transverse ion energization, but we did frequently find intervals where local transverse ion heating was consistent with the observations. We also found a downward flowing ion distribution that occurred simultaneously with a region of intense plasma wave emissions primarily below the lower hybrid resonance frequency. copyright American Geophysical Union 1988

  9. Energía eólica en Argentina : un análisis económico del derecho

    Directory of Open Access Journals (Sweden)

    Cecilia Giralt

    2013-10-01

    Full Text Available El abastecimiento energético con base en fuentes no renovables es un tema altamente estratégico en las agendas de los Estados. El petróleo se está agotando y probablemente las existencias comprobadas no alcanzarán para abastecer el consumo mundial, provocando una serie de impactos sociopolíticos y económicos a nivel global. Esto ha llevado a los gobiernos a replantear sus matrices energéticas, apostando a las energías renovables como un camino posible para lograr una mayor autonomía energética. La Argentina, con una matriz energética desbalanceada e hidrocarburo-dependiente, se ha visto empujada también a reformular su horizonte energético a partir de fuentes renovables para lograr una mayor independencia del recurso fósil. Los marcos regulatorios utilizados para este cambio son el objeto de análisis de este artículo, el cual también intenta contribuir con algunas recomendaciones para un futuro muy cercano.

  10. Modelado y Simulación de un Sistema Conjunto de Energía Solar y Eólica para Analizar su Dependencia de la Red Eléctrica

    Directory of Open Access Journals (Sweden)

    M. Mikati

    2012-07-01

    Full Text Available Resumen: En este artículo se presenta un estudio de la transferencia de energía entre sistemas híbridos de energía renovable y la red eléctrica, para cubrir ciertas demandas de potencia. Se analiza con detalle el sistema de suministro para dos modelos de demanda, una vivienda y una pequeña industria o comercio, utilizando sistemas renovables de pequeña escala situados cerca del usuario, con conexión a la red eléctrica. Se han modelizado y simulado cada uno de los sistemas: tanto los recursos naturales solar y eólico, como el sistema fotovoltaico y el aerogenerador de pequeña escala, así como las demandas, incluyendo en todos ellos efectos no considerados en la literatura. Es decir, se ha desarrollado una plataforma de simulación con todos los elementos, que permite analizar el mejor aprovechamiento de los recursos y la dependencia de la red eléctrica para distintas configuraciones, en función de la relación entre las demandas y los recursos renovables. También permite analizar el dimensionamiento de los recursos. El criterio utilizado para la evaluación es la transferencia de energía con la red y la contribución de la red eléctrica a la demanda (compra-venta, con los correspondientes gastos y pérdidas asociados. Abstract: This study presents an analysis of the power transfer between a small-scale hybrid renewable energy system and the electricity grid to cover some power demands. The renewable energy supply system consists of a small-scale wind turbine and a photovoltaic array located close to the power demand. Power generators and the demand are connected to the electricity grid and the potential of selling excess power back to the grid or buying it if needed is assumed to exist. Two types of power demands are simulated: a large housing area and a small factory. Detailed models are implemented for a small-scale wind turbine and a photovoltaic array, as well as for the wind and solar resources. Simulation results are

  11. A ingestão energética de pacientes em hemodiálise é subrelatada?

    Directory of Open Access Journals (Sweden)

    Inaiana Marques Filizola Vaz

    2015-09-01

    Full Text Available ResumoIntrodução:O sub-relato da ingestão energética é pouco estudado na população em hemodiálise.Objetivo:Avaliar o sub-relato da ingestão energética e os fatores associados em pacientes em hemodiálise.Métodos:Estudo transversal, com 344 pacientes adultos estáveis, de dez centros de hemodiálise de Goiânia-GO. A ingestão energética foi avaliada por seis recordatórios de 24 horas e a taxa de metabolismo basal (TMB foi calculada pela equação de Harris Benedict. Foi considerado como sub-relato quando a razão entre a ingestão energética média e a TMB foi menor que 1,27. Para análise dos fatores associados ao sub-relato, foi utilizada a regressão de Poisson com estimativa robusta da variância.Resultados:A prevalência de sub-relato foi de 65,7%, sendo mais expressiva em indivíduos com excesso de peso e nos dias sem diálise. O resultado final da análise multivariada identificou quatro fatores independentemente associados ao sub-relato: sexo feminino (RP = 1,27; IC = 1,10-1,46, índice de massa corporal ≥ 25 kg/m2 (RP = 1,29; IC = 1,12-1,48, três ou menos refeições/dia (RP = 1,31; IC = 1,14-1,51 e tempo de hemodiálise inferior a cinco anos (RP = 1,19; IC = 1,01-1,40.Conclusão:A população avaliada demonstrou elevada prevalência de sub-relato da ingestão energética. Pertencer ao sexo feminino, apresentar excesso de peso, fazer um menor número de refeições diárias e ter menos tempo de hemodiálise foram fatores associados ao sub-relato.

  12. Certificación energética de edificios en España y sus implicaciones económicas

    Directory of Open Access Journals (Sweden)

    Ruá, M. J.

    2012-09-01

    Full Text Available Under the European Energy Performance of Buildings Directive, the Member States must develop methods to certify energy efficiency of buildings. Calener-VYP v1.0 is the only Spanish official tool to certify a high energy efficiency performance of residential buildings, through the general option. It has two indicators implemented, CO2 emissions and primary energy consumption. However, in the process of energy rating a building, only the CO2 emissions indicator is considered. The economic consequences of this are studied, by means of simulating real properties with different construction assemblies and building services in the twelve Spanish climatic zones and calculating their costs. The results show that having a better energy rate in Calener VYP does not necessarily entail a lower consumption cost. Therefore, it is necessary to include the annual primary energy consumption indicator, because its absence involves that costs cannot be used as an argument when promoting energy efficiency among users.

    Bajo la Directiva Europea sobre eficiencia energética de los edificios, los Estados Miembros deben desarrollar procedimientos para certificar energéticamente los edificios. Calener-VYP v1.0 es la única herramienta oficial española para certificar una elevada aptitud en eficiencia energética de edificios residenciales, por el método general. Tiene dos indicadores implementados, emisiones de CO2 y consumo de energía primaria. Sin embargo, en el proceso de otorgar la calificación energética, solamente se consideran las emisiones de CO2. Las implicaciones económicas de esto se estudian simulando viviendas con diferentes características constructivas e instalaciones en las doce zonas climáticas españolas y calculando sus costes. Los resultados muestran que una mejor calificación energética en Calener-VYP no implica necesariamente un menor coste de consumo energético. Por tanto, es necesario

  13. Hogares y energía eléctrica en México

    Directory of Open Access Journals (Sweden)

    Ana Escoto Castillo

    2016-12-01

    Full Text Available En las últimas dos décadas, la producción de energía eléctrica ha generado más de la quinta parte de las emisiones de CO2en México. En este mismo periodo, el consumo de electricidad en el país ha sido dinamizado por el sector residencial de los hogares. Diversos trabajos apuntan a que los incrementos en los niveles medios de bienestar y la expansión del crédito y vivienda, se tradujeron en cambios en los bienes y servicios que los hogares consumen, pese a la persistencia de la desigualdad. En particular, se señala que incluso los estratos con ingresos más bajos han aumentado sus niveles de consumo. Exploramos si esto ha sucedido y nos preguntamos por las implicaciones ambientales de este aumento. En este trabajo examinamos: (1 en qué medida se observa un cambio en los electrodomésticos que los hogares consumen, (2 hasta dónde éste se asocia con el consumo eléctrico de los hogares; y; (3 si los diversos estratos de ingresos han mantenido un consumo de electrodomésticos estable a lo largo del tiempo. Para ello, construimos una serie armonizada de la Encuesta de Ingreso Gasto de los Hogares (1992, 2002, 2008 y 2012 con características sociodemográficas, ingresos y un índice de bienes eléctricos consumidos por los hogares comparables a través del tiempo. Empleamos una regresión agrupada para observar los cambios en los efectos entre estratos y tiempo.

  14. Fontes energéticas vegetais para juvenis de jundiá e carpa

    Directory of Open Access Journals (Sweden)

    V. Corrêia

    2012-06-01

    Full Text Available Para avaliar o desempenho, o metabolismo e a composição corporal de juvenis de jundiá (Rhamdia quelen e de carpa húngara (Cyprinus carpio alimentados com fontes energéticas vegetais, foi conduzido experimento de 60 dias. Três dietas compostas por aveia descascada, farelo de arroz desengordurado estabilizado (FADE ou por farelo de trigo e milho (dieta-controle foram ofertadas três vezes ao dia a 360 juvenis de jundiá (5,59±0,06g ou de carpa húngara (5,82±0,14g distribuídos em 18 tanques (280L, totalizando nove tanques por espécie. Não foram observadas diferenças significativas no desempenho das espécies estudadas. Em relação aos parâmetros metabólicos, as menores concentrações séricas de colesterol total no jundiá foram verificadas nas dietas com aveia (214,49mg/dL e FADE (216,3mg/dL, enquanto para a carpa húngara as menores concentrações observadas foram nos peixes alimentados com FADE (222,54mg/dL. Quanto à composição centesimal, os valores de gordura no filé foram menores nos jundiás dos tratamentos controle (3,76% e aveia (3,95%. A inclusão de aveia proporcionou menor deposição de gordura corporal em ambas as espécies. Conclui-se que 20% de aveia descascada ou de farelo de arroz desengordurado podem ser incluídos na dieta de juvenis de jundiá e de carpa húngara sem prejuízos para o crescimento.

  15. Modelo de innovación y optimización de la energía solar en España. La aplicación de las tecnologías disponibles para el aprovechamiento de recursos, comercialización y beneficios de la energía solar

    OpenAIRE

    González Peña, Daniel

    2016-01-01

    Tesis Doctoral leída en la Universidad Rey Juan Carlos de Madrid en 2014. Directora de la Tesis: Dra. Carmen de Pablos Heredero En esta Tesis Doctoral se pretende analizar los límites, tanto a medio como a largo plazo, de la competitividad económica de la energía solar en España, estudiando el nivel de evolución que presuntamente debería tener esta forma de producción de energía, hasta conseguir llegar a ser competitiva con las energías fósiles, y otras fuentes emergentes en desarrollo. ...

  16. The Contribution of Compressional Magnetic Pumping to the Energization of the Earth's Outer Electron Radiation Belt During High-Speed Stream-Driven Storms

    Science.gov (United States)

    Borovsky, Joseph E.; Horne, Richard B.; Meredith, Nigel P.

    2017-12-01

    Compressional magnetic pumping is an interaction between cyclic magnetic compressions and pitch angle scattering with the scattering acting as a catalyst to allow the cyclic compressions to energize particles. Compressional magnetic pumping of the outer electron radiation belt at geosynchronous orbit in the dayside magnetosphere is analyzed by means of computer simulations, wherein solar wind compressions of the dayside magnetosphere energize electrons with electron pitch angle scattering by chorus waves and by electromagnetic ion cyclotron (EMIC) waves. The magnetic pumping is found to produce a weak bulk heating of the electron radiation belt, and it also produces an energetic tail on the electron energy distribution. The amount of energization depends on the robustness of the solar wind compressions and on the amplitude of the chorus and/or EMIC waves. Chorus-catalyzed pumping is better at energizing medium-energy (50-200 keV) electrons than it is at energizing higher-energy electrons; at high energies (500 keV-2 MeV) EMIC-catalyzed pumping is a stronger energizer. The magnetic pumping simulation results are compared with energy diffusion calculations for chorus waves in the dayside magnetosphere; in general, compressional magnetic pumping is found to be weaker at accelerating electrons than is chorus-driven energy diffusion. In circumstances when solar wind compressions are robust and when EMIC waves are present in the dayside magnetosphere without the presence of chorus, EMIC-catalyzed magnetic pumping could be the dominant energization mechanism in the dayside magnetosphere, but at such times loss cone losses will be strong.

  17. Análisis de discursos ideológicos en la empresa: La deslegitimación y la defensa de las energías renovables

    Directory of Open Access Journals (Sweden)

    Esperanza Morales-López

    2012-09-01

    Full Text Available En este trabajo se analizan discursos del ámbito empresarial en los que se defienden propuestas ideológicas en el tema económico; en concreto, se analizan varios discursos en los que la Asociación Española de Productores de Energías Renovables (APPA, en adelante responde a las críticas vertidas desde determinadas multinacionales del sector de la energía por las subvenciones públicas otorgadas a las empresas de energías renovables, en particular a los productores de energía fotovoltaica. Los resultados del análisis (pragmático-discursivo y argumentativo revelan que el recurso principal que utiliza APPA para la defensa de este tipo de energías es la recontextualización de las críticas recibidas por parte de las multinacionales del sector de la energía, transformando estas críticas en una macroestrategia de deslegitimación de las energías renovables por parte de estas multinacionales. En el conjunto de los discursos analizados y del resto de estrategias argumentativas utilizadas, se puede observar, además, cómo esta deslegitimación es utilizada por APPA como prueba argumentativo-persuasiva para mostrar lo absurdo de tales críticas. Desde la perspectiva teórico-metodológica, este trabajo muestra la importancia en estos discursos de los recursos retóricoselocutivos; es decir, de aquellos capaces de activar marcos cognitivos determinados que evocan emociones, porque tanto transmiten intenciones como mueven a la acción. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs1203209

  18. Small Data

    NARCIS (Netherlands)

    S. Pemberton (Steven)

    2014-01-01

    htmlabstractThe term “Open Data” often goes hand in hand with the term “Big Data”, where large data sets get released allowing for analysis, but the Cinderella of the Open Data ball is Small Data, small amounts of data, nonetheless possibly essential, that are too small to be put in some database or

  19. Conversión química y biológica de la energía luminosa fotoproducción de peroxido de hidrógeno

    OpenAIRE

    Roncel Gil, Mercedes

    1988-01-01

    Todas las formas de vida hasta ahora conocidas en nuestro planeta requieren energía para su crecimiento y conservación. Las plantas superiores y algunos tipos de algas y bacterias obtienen energía directamente de la radiación solar, que utilizan para sintetizar aquel las sustancias esenciales para su propio conocimiento y desarrollo. Los animales, en cambio, no pueden utilizar la luz solar como fuente de energía y satisfacen sus requerimientos energéticos alimentándose de plantas u otros anim...

  20. Caracteriza??es f?sica e qu?mica de res?duos s?lidos da cajucultura e avalia??o do potencial energ?tico em processos de convers?o t?rmica

    OpenAIRE

    Tavares, Priscilla Torquato

    2016-01-01

    O aumento da demanda energ?tica e a crescente necessidade de produ??o sustent?vel de energia tem mostrado a import?ncia da diversifica??o das fontes energ?ticas. A biomassa tem se destacado por suas caracter?sticas econ?micas, f?sicas e qu?micas, podendo ser considerada como a fonte energ?tica do futuro. Os res?duos agr?colas s?o uma forma de biomassa apropriada para produ??o energ?tica. A gera??o de res?duos proveniente do cultivo e beneficiamento do caju produziu em 2015, no ...

  1. Análisis técnico económico preliminar para generar electricidad con energía renovable // Preliminary technical economic analysis to generate electricity with renewable energy

    OpenAIRE

    M. Menéndez González

    2000-01-01

    Dentro de las posibilidades energéticas y medioambientales de los distintos tipos de energías renovables; la eólica por sucarácter limpio e inagotable, permite un gran desarrollo en aquellas áreas que cuentan con el potencial necesario para suaplicación y de forma similar, la energía solar presenta ventajas importantes, ambas son recursos gratuitos, nocontaminantes y disponibles en muchas localidades. Según las tecnologías actualmente disponibles, la utilización desistemas híbridos de energía...

  2. Características relevantes de la simulación energética de viviendas unifamiliares

    Directory of Open Access Journals (Sweden)

    García-Alvarado, R.

    2014-03-01

    Full Text Available Energy simulation systems allow analyzing the environmental quality and demand of buildings, but they must have reliable and proper procedures. This paper identifies relevant conditions of energy simulation systems for the study of single-family homes, based on the analysis of a dozen programs and various experiences in south central Chile. A review of capabilities was conducted, simulating the same case in all systems and making interviews with expert users. Besides it studied the incidence of background data and different strategies for analysis the environmental performance of housing. Revealing significant characteristics in the energy study of detached residential buildings. Finally it suggests reviewing certain conditions to ensure the effectiveness of the environmental analysis and subsequent actions.Los sistemas de simulación energética de edificios permiten analizar la calidad y demanda ambiental de las construcciones, pero deben contar con procedimientos fiables y pertinentes. Este artículo identifica condiciones relevantes de la simulación energética de viviendas unifamiliares, basado en el análisis de una docena de programas y distintas experiencias en el centro sur de Chile. Desarrollando una revisión de capacidades de los sistemas, a través de la simulación de una misma vivienda y entrevistas a usuarios expertos. Además de estudiar incidencias de los antecedentes y distintas estrategias de análisis para el mejoramiento ambiental de viviendas. Revelando características significativas para el estudio energético de construcciones habitacionales aisladas. Finalmente sugiere revisar ciertas condiciones de los sistemas para asegurar la efectividad de los análisis ambientales y de las acciones subsecuentes.

  3. Seguidor Solar, optimizando el aprovechamiento de la energía solar ; Solar tracker, optimizing ofimprovementof the solar energy

    Directory of Open Access Journals (Sweden)

    Noel Machado Toranzo

    2015-06-01

    Full Text Available En este trabajo se realizó el diseño e implementación de un dispositivo encargado de obtener las coordenadas del Sol en cualquier momento del día, es decir, un seguidor solar a dos ejes por punto luminoso. Este seguidor consta de dos bloques principales: la tarjeta controladora y la parte mecánica. Su diseño se basó en el uso de fotorresistencias, microcontroladores y motores de pasos, el mismo posee altas prestaciones y bajo costo. El prototipo construido es utilizado en las investigaciones de aprovechamiento de la energía solar que se realizan en el Grupo de Energía Renovable Aplicadas (GERA de la Universidad de Oriente, particularmente en los paneles fotovoltaicos y los calentadores de agua. Se realizó una prueba experimental en los laboratorios y en el polígono de dicho grupo y se comprobó que el seguidor solar funciona adecuadamente, cumpliendo con las expectativas deseadas.The design and implementation of a device for obtaining the coordinates of the sun at any time during the day, it means, a solar tracker of type two axis by luminous point is developed in this paper. This tracker consists of two main blocks: the controller board and the mechanical part. The design is based on the use of photoresistences, microcontrollers and stepper motors. The prototype is used on investigations about solar energy developed at the GERA (Grupo de Energía Renovable Aplicada of Universidad de Oriente, particularly in photovoltaic panels and water heaters. An experimental test was conducted in the laboratories and at the site of the group and it was found that the solar tracker is functioning properly, meeting the desired expectations.

  4. El profesor como catalizador de energía emocional frente a la ambivalencia del nuevo entorno tecno-educativo

    Directory of Open Access Journals (Sweden)

    Jesús Romero Moñivas

    2016-01-01

    Full Text Available Resumen Este artículo pretende dos objetivos complementarios: por un lado, mostrar en el primer epígrafe las limitaciones constitutivas a los estudios teórico-empíricos que tratan de analizar los vínculos causales entre las tecnologías y la educación. Se intenta poner de manifiesto que tal empresa carece de un final feliz por sus propias limitaciones endógenas. Por otro lado, mostrar que, más allá de esos vínculos causales, hay una cuestión ineludible en el aspecto micro-educativo: la co-presencia física de profesores y alumnos para generar rituales con alta energía emocional. Para ello, se utiliza el modelo de cadenas de rituales de interacción de Randall Collins (2004 y el modelo de autoeficacia docente de Pajares y Bandura. Se quiere poner de manifiesto que el papel del profesor universitario, además de la transmisión de información y contenidos (que exige un profesor con un papel activo en la investigación, es el de ser catalizador y generador de energía emocional en el aula, que requiere la co-presencia física. Se concluye que dependiendo de los objetivos de los estudiantes a la hora de elegir sus estudios en cuestión, estos podrían virtualizarse completamente cuando sólo se busca la adquisición de contenidos, o deberán mantener la co-presencia física cuando los objetivos del estudiante rebasen lo puramente informativo, y busquen también la entrada en rituales de interacción en los que se transmitan emociones y energías que coadyuvan a la importancia de los contenidos intelectuales.

  5. Sistema de gestión del agua en una planta de energía solar

    OpenAIRE

    Serra Lleonart, Alfons

    2007-01-01

    Premi al millor Projecte de Fi de Carrera presentat durant el curs 2006-2007 en l'àmbit d'Optimització de Recursos que atorga DOW CHEMICAL En un pueblo de la provincia de Sevilla, en Andalucía, se está proyectando la construcción de una central solar con tecnología de torre. Está central se abastece de la radiación solar para producir energía eléctrica mediante 600 espejos que reflejan la luz solar hacia una torre equipada en su parte superior con un receptor solar capaz de transf...

  6. Oportunidades y desafios para la inserción de la energía solar en Salta

    OpenAIRE

    Belmonte, Silvina; Ibarra, M.; Franco, Ada Judith

    2017-01-01

    El trabajo sintetiza un conjunto de oportunidades y limitaciones identificadas para la inserción de energías renovables en Salta. Estos puntos claves surgen de una consulta participativa sobre experiencias realizadas o expectativas de aplicaciones tecnológicas en base a renovables realizada a informantes claves (técnicos y referentes institucionales) y un relevamiento exploratorio en las diversas regiones geográficas de Salta. Se ha detectado un conjunto de desafíos referidos a cuestiones téc...

  7. El coste energético de la desalinización en el programa A.G.U.A.

    Directory of Open Access Journals (Sweden)

    Alberto del Villar García

    2014-01-01

    Full Text Available Tras la derogación del trasvase del Ebro por el Real Decreto 2/2004 y la promulgación de la Ley 11/2005 de modificación del Plan Hidrológico Nacional, se reorientó la política del agua para satisfacer las nuevas necesidades de agua en el arco mediterráneo peninsular por medio de la desalinización. Esta política se ha centrado en un conjunto de actuaciones a través del llamado Programa A.G.U.A. (Actuaciones para la Gestión y Utilización del Agua. Las actuaciones en materia de desalinización de dicho programa se han materializado en la construcción de 16 nuevas plantas desalinizadoras con una capacidad de producción de casi 350 hm3. Del conjunto de estas actuaciones, al menos 6 de ellas pretendían satisfacer, de manera parcial, las necesidades de agua de unas 244.000 hectáreas de regadío, con un volumen de unos 155,37 hm3. En 2008, el coste por metro cúbico estimado de producción, en las seis plantas destinadas a riego agrícola ascendía a 0,8634 €. El coste energético suponía aproximadamente un 52% de los costes de operación y mantenimiento, y un 39% de los costes totales (0,3373 €/m3. Este coste se estimó con una factura energética que recogía un precio de la energía en el entorno de 0,08 €/kwh. En 2012 el precio de la energía se sitúa por encima de 0,14 €/kwh, un 65% superior al calculado para 2008. Este incremento se traduce en un aumento de la factura por esta fuente de recursos calculado en unos 0,21 €/m3.

  8. Actualidad y perspectivas de una bomba de calor de expansión directa con energía solar

    OpenAIRE

    Gorozabel-Chata, Francis-B.; Carbonell-Morales, Tania

    2016-01-01

    La bomba de calor de expansión directa con asistencia de energía solar se utiliza en el modo de calefacción para diversas aplicaciones entre las que podemos citar, calentamiento de agua, calentamiento de aire para climatizar edificios, desalinización de agua, secado solar entre otras. El presente trabajo revisa las principales investigaciones sobre esta tecnología enfocando sus aplicaciones para el calentamiento de agua, para lograr este objetivo se describen en detalle la configuración básic...

  9. ISO 50001 Norma mundial para a eficiência energética. Porquê uma norma mundial?

    OpenAIRE

    Branco, Paulo

    2013-01-01

    Nem sempre são fáceis os desafios ambientais associados ao consumo de energia. Sobretudo devido à forte dependência de combustíveis fósseis, torna-se cada vez mais evidente a inevitabilidade de agentes económicos, políticos, sociedade em geral, assumirem um compromisso focado na melhoria da eficiência energética e no uso racional da energia, decorrente das atividades económicas. Esta preocupação assume-se também como nacional. A norma NP EN ISO 50001 apresenta...

  10. Eficiência energética na administração do Porto de Sines

    OpenAIRE

    Guerreiro, Rita Fernandes

    2009-01-01

    Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para a obtenção do grau de Mestre em Engenharia do Ambiente, perfil Gestão e Sistemas Ambientais A problemática energética é actualmente uma questão dominante nas agendas mundiais. A dependência de fontes de energia externas é uma realidade e compete aos governos e organizações mudar este paradigma, apostando na eficiência, segurança e fiabilidade do abastecimento. A actividade portuári...

  11. Ciudad, transporte y energía: una nueva propuesta desde la problemática de la movilidad metropolitana

    OpenAIRE

    Casellas, Antònia; Poli, Corrado

    2011-01-01

    A partir del análisis del problema de la movilidad y la creciente dependencia de las energías fósiles en un periodo de expansión de la demanda por parte de países emergentes, el presente artículo cuestiona el consolidado debate en torno a la necesidad e importancia de las áreas metropolitanas. Cuestionada la tendencia general, se argumenta que a nivel de escala metropolitana se debe actuar para reducir la movilidad en lugar de incentivarla. Para ello se apunta a la necesidad de un cambio de p...

  12. Reducción de gasto energético eléctrico usando seis sigma

    OpenAIRE

    Morato Orozco, Juan Sebastián

    2009-01-01

    The application of Six Sigma to the models of energy management is vital because it brings a continuous improvement, optimizes the efficient consumption of energy and strengthens the conservation culture. This article shows an example of the application of the Six Sigma methodology in the energy management models used for the “Reduction of Energy Waste” in the Sumicol-Corona industrial park in Sabaneta, Antioquia. La aplicación de Seis Sigma a los modelos de gestión energética ...

  13. It’s Time to Take the Chill Out of Cost Containment and Re-energize Key Acquisition Practice

    Science.gov (United States)

    2010-05-01

    Lockheed Martin ? ? ? ? ZCORE Cost Oriented Resource  Estimating Model USAF ? ? ? ? ACEIT Automated Cost  Estimating  Integrated  Tools  (USAF, USA...and Logistics) Milestone III chair LCCH Criticisms of high cost, ASD (Acquisition and Logistics) Milestone III chair ACEIT (86 USAF at Hanscom...w/Tecolote Research) ACEIT (86 USAF at Hanscom w/Tecolote Research) ?? It’s Time to Take the Chill Out of Cost Containment and Re-energize a

  14. Producción de energía por combustión de basuras en bogotá

    OpenAIRE

    Morales Gilede, Abel

    2010-01-01

    Este estudio tiene por objeto hacer un avalúo de la posibilidad de producir energía por medio de la incineración de las basuras provenientes de la ciudad de Bogotá. El estudio se desarrolló con base en la información existente. Elaborada especialmente por EDIS. Por contratos realizados por esta entidad con diferentes compañías y con la colaboración del Instituto de Investigaciones Tecnológicas y complementada por los Laboratorios de la Universidad Nacional. Con base en estos estudios se obtuv...

  15. Trasnferencia de Energía en NP de polimeros conjugados: modelado y contraste con datos experimentales

    OpenAIRE

    Bellomo, Franco; Bellomo, Lucas; Bellomo, Daniel; Ponzio, Rodrigo; Palacios, Rodrigo

    2015-01-01

    Los polímeros conjugados son macromoléculas compuestas por monómeros que presentan enlaces simples y múltiples alternados. Dentro de la cadena existen segmentos (cromóforos) de longitud variable en donde los electrones π se encuentran deslocalizados. Debido a la heterogeneidad estructural de estos materiales, los procesos de transferencia de energía (TE) entre cromóforos y dopantes son altamente complejos. El mejor entendimiento de estos procesos es de importancia para el desarrollo de dispos...

  16. Alternativas para incrementar la liquidez del mercado de energía mayorista colombiano: el caso del mercado no regulado

    OpenAIRE

    García Gómez, Diego Felipe; Mejía Sierra, Diego Fernando

    2013-01-01

    El presente estudio tiene como objetivo la presentación de alternativas que contribuyan a aumentar la liquidez del mercado no regulado de energía eléctrica en Colombia -- Para ello se parte de una revisión general del mercado eléctrico colombiano, posteriormente se introduce el concepto liquidez, haciendo énfasis en la liquidez en mercados eléctricos y se referencian algunos mercados eléctricos desarrollados en Europa, Norte América, Países Nórdicos e Inglaterra -- Se concluye que es necesari...

  17. Analysis of Two Electrocution Accidents in Greece that Occurred due to Unexpected Re-energization of Power Lines

    Directory of Open Access Journals (Sweden)

    Aikaterini D. Baka

    2014-09-01

    Full Text Available Investigation and analysis of accidents are critical elements of safety management. The over-riding purpose of an organization in carrying out an accident investigation is to prevent similar accidents, as well as seek a general improvement in the management of health and safety. Hundreds of workers have suffered injuries while installing, maintaining, or servicing machinery and equipment due to sudden re-energization of power lines. This study presents and analyzes two electrical accidents (1 fatal injury and 1 serious injury that occurred because the power supply was reconnected inadvertently or by mistake.

  18. Analysis of Two Electrocution Accidents in Greece that Occurred due to Unexpected Re-energization of Power Lines.

    Science.gov (United States)

    Baka, Aikaterini D; Uzunoglu, Nikolaos K

    2014-09-01

    Investigation and analysis of accidents are critical elements of safety management. The over-riding purpose of an organization in carrying out an accident investigation is to prevent similar accidents, as well as seek a general improvement in the management of health and safety. Hundreds of workers have suffered injuries while installing, maintaining, or servicing machinery and equipment due to sudden re-energization of power lines. This study presents and analyzes two electrical accidents (1 fatal injury and 1 serious injury) that occurred because the power supply was reconnected inadvertently or by mistake.

  19. Impacto de programas de eficiencia energética eléctrica, estudio de caso: Empresas alimentarias en Cuenca, Ecuador

    Directory of Open Access Journals (Sweden)

    Galo Carrillo-Rojas

    2014-01-01

    Full Text Available El estudio exploratorio muestra los resultados de aplicación de programas de eficiencia energética eléctrica en 7 empresas alimentarias en Cuenca, Ecuador. La investigación contempló fases de diagnóstico, intervención y evaluación. Se condujo un análisis comparativo entre las empresas: consumo de energía versus producción, análisis de calidad de energía, relación cumplimiento/consumo específico de energía, e impacto sobre emisiones CO2. Los resultados revelaron que la aceptación hacia las recomendaciones de ahorro, se basa en el nivel de inversión y la voluntad/disponibilidad administrativa. El estudio mostró que las intervenciones tuvieron un efecto parcial sobre la reducción del consumo específico de energía en 4 empresas. Adicionalmente se obtuvo un efecto positivo en la corrección de factor de potencia en una empresa y en la mejora del balance de corriente en 5. La investigación mostró la existencia de una reducción significativa de emisiones post-intervención, resaltando la efectividad de los programas.

  20. ENERGÍA DE BAJA INTENSIDAD: gobiernos, mercados e instituciones en el regionalismo energético de América del Sur

    Directory of Open Access Journals (Sweden)

    Stefano Palestini

    Full Text Available A pesar de haber sido considerada un área prioritaria de cooperación, el regionalismo energético sudamericano muestra signos de estancamiento, evidenciados por las infructuosas negociaciones de un Tratado Energético Sudamericano. Este artículo explica la paradoja de por qué, no obstante la voluntad política, las favorables condiciones estructurales para la integración, y la creación de instituciones regionales ad hoc, el regionalismo energético no consiguió pasar de las declaraciones intergubernamentales a la implementación de políticas. Se argumenta que ninguna de las instituciones creadas ha sido capaz de mediar la divergencia entre mercados y entre preferencias gubernamentales. Se requiere por tanto de un nuevo consenso que replantee la necesidad y la capacidad de la región para llevar adelante la agenda de integración energética. A un nivel más general, el caso del sector energético brinda lecciones importantes acerca de los desafíos futuros que enfrenta la cooperación regional en materia de políticas públicas en Sudamérica.

  1. Análisis DAFO del sector de la energía eólica en España

    Directory of Open Access Journals (Sweden)

    López-Vico, Victoria

    2009-06-01

    Full Text Available a energía eólica se ha convertido en un sector económico y energético clave en la actualidad, tanto en España como en el resto del mundo. Con el objetivo de saber si ésta energía puede responder a las necesidades de demanda energética, siendo una energía sustitutiva a los tradicionales combustibles fósiles, hemos realizado un análisis DAFO, donde se muestran las debilidades, amenazas, fortalezas y oportunidades de este sector en auge.Wind power has become a very important economic and power sector, as much in Spain as in the rest of the world. With the aim of knowing if this energy can respond to the energetic demand, being a substitute energy to traditional fossil fuels, we have realised a SWOT analysis, where we can know the strengths, threats, opportunities and weaknesses of this sector in full expansion.

  2. O uso energético da madeira The use of wood as energy

    Directory of Open Access Journals (Sweden)

    José Otávio Brito

    2007-04-01

    Full Text Available Uma importante retomada de crescimento, observada nos últimos dez anos, vem tomando conta da tendência de declínio do consumo de madeira para energia no Brasil, iniciada na metade do século passado. Diante desse fato, o uso energético continua representando o maior consumo de madeira para um fim específico no país, atingindo 61% do volume total. Em que pese tal aspecto, há ainda muito a ser conquistado, quanto à definição e à implantação de ações pragmáticas, para a real valorização desse uso no país. Neste trabalho são debatidos os aspectos quantitativos relacionado a tal aplicação, seu espaço estratégico e as demandas de definições e de ações a ela relacionadas. É ainda mostrado que antigas necessidades ainda não foram devidamente contempladas, no sentido da consolidação dessa importante e fundamental forma de aplicação da madeira, considerando-se os dias atuais, em que a utilização de fontes fósseis de energia está sendo fortemente questionada.In the last ten years, an important restoration of wood consumption for energy production purposes in Brazil has been taking place, going against a decline tendency initiated in the mid 1900s. For that reason, energy production still represents the greatest demand of wood for a determined application: 61% of the total volume. However, there is still a lot to conquer in the definition and implantation of pragmatic actions for the valorization of this practice in the country. In this paper, quantitative aspects of this application will be discussed, as well as its strategic scope and the request for the definition of actions and plans. Long-felt needs for the consolidation of this important and fundamental application of wood that haven’t been fulfilled are also pointed out, considering the current debate in which the use of fossil energy sources is being challenged.

  3. Viabilidad del desarrollo sostenible en un mundo insolidario : consumo energético e impacto ambiental

    Directory of Open Access Journals (Sweden)

    Alfredo Mingorance Jiménez

    1995-01-01

    Full Text Available El acelerado crecimiento económico de los países desarrollados y la peligrosa imitación de este modelo por parte de los países en vías de desarrollo (PVD suponen una seria y preocupante amenaza para los habitantes del Planeta. En el catálogo de problemas ambientales destaca el calentamiento global de la atmósfera, causado fundamentalmente por la combustión de energías fósiles y la deforestación. Por ello, se trata de disuadir a los PVD para que no subordinen su progreso a los combustibles fósiles. La consecución de este propósito depende de la solidaridad de los países ricos.La croissance e'conomique accélérée des pays développés et la dangereuse imitation de ce modele par les pays en voie de développement (PVD constituent une menace inquietante pour les habitants de la Planéte. Le réchauffement global de l'atmosphére est un des plus importants problémes de l'environnement, celui-ci est causé essentiellement par la combustión des énergies fossiles et par la déforestacion. C'est pourquoi il s'agit de dissuader les PVD afin qu'iis ne conditionnent leur progrés á ce genre de combustibles. Le succés de cet entreprise dépend absolument de la solidarité des pays riches. The accelerated economic growth of the developped countries and the dangerous imitation of this model by the developing countries means a serious and worrying threat for the people of this planet. The global heating of the atmosphere is one of the most concerning environmental probiem, which is basically caused by the burning of fossil énergies and deforestation. Therefore, it is necessary to deter developing countries from using fossil fuels in their effort to progress. The achievement of this goal depends on the solidarity of the rich countries.

  4. El desarrollo de las energías renovables y el paisaje: algunas bases para la implementación de la Convención Europea del Paisaje en la Política energética española

    Directory of Open Access Journals (Sweden)

    Marina Frolova

    2008-01-01

    Full Text Available Desde el inicio del proceso de reforma de la política energética de la Unión Europea, los paisajes emergentes a partir de generación de electricidad con energías renovables suscitan un interés creciente. España se caracteriza por una implantación muy exitosa de las políticas europeas en materia de energías renovables. Sin embargo, la proliferación de aerogeneradores y placas fotovoltaicas en espacios agrícolas o improductivos conlleva la destrucción de numerosos paisajes muy valiosos. Por lo que la nueva sensibilidad hacia los paisajes se está convirtiendo en el mayor obstáculo para el desarrollo de las energías renovables. El objetivo de este artículo es explorar en la relación que se establece entre la implantación de las energías renovables y la evolución de las políticas paisajísticas. Para ello, se analiza el desarrollo que han experimentado las políticas de energías renovables en Europa y en España; se estudian las nuevas formas democráticas de gestión del territorio que plantea la Convención Europea del Paisaje. Por último, se tratan determinados temas de la inclusión del paisaje en las políticas de energías renovables en España, comentando algunos ejemplos en los que se detectan nuevas estrategias en la implantación de proyectos de energías renovables que pueden reducir los impactos sobre el paisaje.

  5. Temperature, energy acquisition and energy use in the Chilean silverside Basilichthys australis Eigenmann (Atherinopsidae Temperatura, adquisición de energía y uso de energía en el pejerrey chileno Basilichthys australis Eigenmann (Atherinopsidae

    Directory of Open Access Journals (Sweden)

    LEOPOLDO FUENTES

    2005-06-01

    Full Text Available We evaluated the influence of water temperature (Tw on the energy acquisition and use in the chilean silverside Basilichthys australis (Eigenmann 1927, an endemic species inhabiting freshwater ecosystems in Chile. We tested the effect of Tw (11.5, 14.0, 18.0, 22.0 and 26.0 °C on food intake, digestibility, food transit time and metabolic rate. As expected, this study demonstrated that many physiological variables under study were significantly affected by Tw, as well as the net energy balance of this species. Nevertheless, the net energy balance was not strictly related to the range of Tws evaluated. At Tws lower than 14 °C the energy budget was depressed, because food intake was lower than at Tws between 14 and 26 °C, where food intake was higher and independent of Tw. Consequently, at these temperatures the energy balance was positive and also independent of Tw. Physiologically, B. australis appears to be a tolerant species with respect to the wide range of water temperature in habitats at different depths. Thus, its distributions may extend through the entire profile of lakes and rivers, even in systems characterised by spatial and temporal thermal variabilityEn este trabajo evaluamos la influencia de la temperatura del agua (Ta en la adquisición de energía y su uso por parte del pejerrey chileno Basilichthys australis (Eigenmann 1927, una especie endémica que habita los ecosistemas dulceacuícolas de Chile. Investigamos el efecto de Ta (11,5, 14,0, 18,0, 22,0 y 26,0 °C en la ingesta de alimento, digestibilidad, tiempo de transito del alimento y tasa metabólica. De acuerdo a lo esperado, este estudio demostró que varias de las variables fisiológicas bajo estudio fueron significativamente afectadas por Ta, así como el balance energético de esta especie. Sin embargo, el balance neto de energía no estuvo estrictamente relacionado al rango de Tas evaluadas. En Tas inferiores a 14 °C el presupuesto de energía fue deprimido, debido a

  6. Small Data

    OpenAIRE

    Pemberton, Steven

    2014-01-01

    htmlabstractThe term “Open Data” often goes hand in hand with the term “Big Data”, where large data sets get released allowing for analysis, but the Cinderella of the Open Data ball is Small Data, small amounts of data, nonetheless possibly essential, that are too small to be put in some database or online dataset to be put to use. RDFa is a technology that allows Cinderella to go to the ball.

  7. Are Polyatomic Interferences, Cross Contamination, Mixing-Effect, etc., Obstacles for the Use of Laser Ablation-ICP-MS Coupling as an Operational Technique for Uranium Isotope Ratio Particle Analysis?

    International Nuclear Information System (INIS)

    Donard, A.; Pointurier, F.; Pecheyran, C.

    2015-01-01

    Analysis of ''environmental samples'', which consists in dust collected with cotton clothes wiped by inspectors on surfaces inside declared nuclear facilities, is a key tool for safeguards. Although two methods (fission tracks-TIMS and SIMS) are already used routinely to determine the isotopic composition of uranium particles, the laser ablationinductively coupled plasma mass spectrometry (LA-ICP-MS) coupling has been proven to be an interesting option thanks to its rapidity, high sensitivity and high signal/noise ratio. At CEA and UPPA, feasibility of particle analysis using a nanosecond LA device and a quadrupole ICP-MS has been demonstrated. However, despite the obvious potential of LA-ICP-MS for particle analysis, the effect of many phenomena which may bias isotope ratio measurements or lead to false detections must be investigated. Actually, environmental samples contain many types of non-uranium particles (organic debris, iron oxides, etc.) that can form molecular interferences and induce the risk of isotopic measurement bias, especially for minor isotopes (234U, 236U). The influence of these polyatomic interferences on the measurements will be discussed. Moreover, different uranium isotopic compositions can be found in the same sample. Therefore, risks of memory effect and of particle-toparticle cross-contamination by the deposition of ablation debris around the crater have also been investigated. This study has been conducted by using a femtosecond laser ablation device coupled to a high sensitivity sector field ICP-MS. Particles were fixed onto the discs with collodion and were located thanks to their fission tracks so that micrometric particles can be analyzed separately. All uranium isotope ratios were measured. Results are compared with the ones obtained with the fission tracks-TIMS technique on other deposition discs from the same sample. Performance of the method in terms of accuracy, precision, and detection limits are estimated

  8. Research directed at developing a classical theory to describe isotope separation of polyatomic molecules illuminated by intense infrared radiation. Final report, May 7-September 30, 1979, extension December 31, 1979

    International Nuclear Information System (INIS)

    Lamb, W.E. Jr.

    1981-12-01

    This final report describes research on the theory of isotope separation produced by the illumination of polyatomic molecules by intense infrared laser radiation. This process is investigated by treating the molecule, sulfur hexafluoride, as a system of seven classical particles that obey the Newtonian equations of motion. A minicomputer is used to integrate these differential equations. The particles are acted on by interatomic forces, and by the time-dependent electric field of the laser. We have a very satisfactory expression for the interaction of the laser and the molecule which is compatible with infrared absorption and spectroscopic data. The interatomic potential is capable of improvement, and progress on this problem is still being made. We have made several computer runs of the dynamical behavior of the molecule using a reasonably good model for the interatomic force law. For the laser parameters chosen, we find that typically the molecule passes quickly through the resonance region into the quasi-continuum and even well into the real continuum before dissociation actually occurs. When viewed on a display terminal, the motions are exceedingly complex. As an aid to the visualization of the process, we have made a number of 16 mm movies depicting a three-dimensional representation of the motion of the seven particles. These show even more clearly the enormous complexity of the motions, and make clear the desirability of finding ways of characterizing the motion in simple ways without giving all of the numerical detail. One of the ways to do this is to introduce statistical parameters such as a temperature associated with the distribution of kinetic energies of the single particle. We have made such an analysis of our data runs, and have found favorable indications that such methods will prove useful in keeping track of the dynamical histories

  9. Experimental and theoretical analysis of effects of atomic, diatomic and polyatomic inert gases in air and EGR on mixture properties, combustion, thermal efficiency and NOx emissions of a pilot-ignited NG engine

    International Nuclear Information System (INIS)

    Li, Weifeng; Liu, Zhongchang; Wang, Zhongshu; Dou, Huili

    2015-01-01

    Highlights: • The specific heat ratio of the mixture increases with increasing Ar. • The thermal efficiency increases first and then decreases with increasing Ar. • Mechanisms of reducing NOx emissions are different for different dilution gases. • A suitable inert gas should be used to meet different requirements. - Abstract: Argon (Ar), nitrogen (N_2) and carbon dioxide (CO_2), present in exhaust gas recirculation (EGR) and air, are common atomic, diatomic and polyatomic inert gases, separately. As dilution gases, they are always added into the intake charge to reduce nitrogen oxides (NOx) emissions, directly or along with EGR and air. This paper presents the effects of Ar, N_2 and CO_2 on mixture properties, combustion, thermal efficiency and NOx emissions of pilot-ignited natural gas engines. Thermodynamic properties of the air-dilution gas mixture with increasing dilution gases, including density, gas constant, specific heat ratio, specific heat capacity, heat capacity and thermal diffusivity, were analyzed theoretically using thermodynamic relations and ideal gas equations based on experimental results. The thermal and diluent effects of dilution gases on NOx emissions were investigated based on Arrhenius Law and Zeldovich Mechanism, experimentally and theoretically. The experiments were arranged based on an electronically controlled heavy-duty, 6-cylinder, turbocharged, pilot-ignited natural gas engine. The resulted show that adding different inert gases into the intake charge had different influences on the thermodynamic properties of the air-dilution gas mixture. No great change in combustion phase was found with increasing dilution ratio (DR) of Ar, while the flame development duration increased significantly and CA50 moved far away from combustion top dead center (TDC) obviously with increasing DR for both of N_2 and CO_2. Adding Ar was superior in maintaining high thermal efficiencies than CO_2 and N_2, but adding CO_2 was superior in maintaining

  10. Research Directed at Developing a Classical Theory to Describe Isotope Separation of Polyatomic Molecules Illuminated by Intense Infrared Radiation. Final Report for period May 7, 1979 to September 30, 1979; Extension December 31, 1997

    Science.gov (United States)

    Lamb, W. E. Jr.

    1981-12-01

    This final report describes research on the theory of isotope separation produced by the illumination of polyatomic molecules by intense infrared laser radiation. This process is investigated by treating the molecule, sulfur hexafluoride, as a system of seven classical particles that obey the Newtonian equations of motion. A minicomputer is used to integrate these differential equations. The particles are acted on by interatomic forces, and by the time-dependent electric field of the laser. We have a very satisfactory expression for the interaction of the laser and the molecule which is compatible with infrared absorption and spectroscopic data. The interatomic potential is capable of improvement, and progress on this problem is still being made. We have made several computer runs of the dynamical behavior of the molecule using a reasonably good model for the interatomic force law. For the laser parameters chosen, we find that typically the molecule passes quickly through the resonance region into the quasi-continuum and even well into the real continuum before dissociation actually occurs. When viewed on a display terminal, the motions are exceedingly complex. As an aid to the visualization of the process, we have made a number of 16 mm movies depicting a three-dimensional representation of the motion of the seven particles. These show even more clearly the enormous complexity of the motions, and make clear the desirability of finding ways of characterizing the motion in simple ways without giving all of the numerical detail. One of the ways to do this is to introduce statistical parameters such as a temperature associated with the distribution of kinetic energies of the single particle. We have made such an analysis of our data runs, and have found favorable indications that such methods will prove useful in keeping track of the dynamical histories.

  11. Participación de la energía hidroeléctrica en México para el 2013

    OpenAIRE

    Loredo González, Jesús Alberto; Mendoza Ramírez, Virginia; Salgado Banda, Karla María; Segovia Salazar, Perla; Vargas de la Rosa, Laura Nohemí; Zamudio Morán, Roberto Abraham; Martínez, Ubaldo

    2013-01-01

    El estudio de energías alternas es importante pues, en la actualidad, se busca reducir el alto consumo de fuentes energéticas de tipo fósil con el fin de controlar el impacto ambiental ocasionado por la generación de esta. la energía hidroeléctrica es un área de oportunidad que México debe aprovechar, esta depende de la meteorología de cada región así como de los meses con mayor precipitación pluvial. la producción de electricidad por medios hídricos ha presentado una tendencia crecie...

  12. Climatización de vivienda a partir de energía geotérmica de baja entalpía

    OpenAIRE

    Alfaro del Moral, Ignacio

    2015-01-01

    El TFG está centrado en la energía geotérmica utilizada para la climatización de una vivienda. Se elige una vivienda a la que se desea realizar una instalación geotérmica, de modo que una vez se ha realizado un estudio de la misma, se lleva a cabo un amplio estudio de la fuente renovable (tipos de energía, tipos de yacimientos, situación de la energía geotérmica, componentes del sistema, diseño del sistema, etc.). El proyecto desemboca en la elección de los componentes geotérmicos ideales par...

  13. Consecuencias nutritivas de la sustitución energética de la proteina dietaria por grasa y/o hidratos de carbono en la trucha

    OpenAIRE

    Cardenete Hernández, Gabriel

    2011-01-01

    Puesto que la trucha utiliza buena parte de la proteína dietaria con fines energéticos se ha alimentado a truchas arcoiris con 5 dietas experimentales cuya relación proteína/energía disminuye progresivamente gracias a la adición degrasa y almidón y a la real sustitución de parte de la proteína por estas fuentes energéticas en 2 grupos de experimentos: a nivel piloto y semiindustrial. La acumulación proteica en la carcasse es prácticamente idéntica para todas las dietas siendo el factor determ...

  14. El resurgimiento de la energía minihidráulica en España y su situación actual

    OpenAIRE

    Espejo Marín, Cayetano; García Marín, Ramón; Aparicio Guerrero, Ana Eulalia

    2017-01-01

    Las centrales minihidráulicas han sido una fuente de energía pionera para la producción de electricidad desde finales del siglo XIX. La crisis del petróleo en los años setenta del siglo XX puso de relieve la necesidad de apostar por las energías renovables, por su carácter autóctono, porque reducían la dependencia del exterior y por su menor impacto ambiental. Este artículo analiza la evolución de la energía minihidráulica en España desde mediados del siglo XX a la actualidad. El análisis del...

  15. El proyecto hidroeléctrico Coca Codo Sinclair y la gobernanza energética en la Amazonía ecuatoriana

    Directory of Open Access Journals (Sweden)

    Victor López

    2013-10-01

    Full Text Available Las condiciones en las que el Estado impulsa el cambio de la matriz energética, configuran problemas de gobernanza y retos para una gestión de energías renovables en la Amazonía, acorde con la Constitución y la planificación estatal del desarrollo. Coca Codo Sinclair (CCS es el mayor proyecto hidroeléctrico en implementación y apuntala las políticas de soberanía y eficiencia energética del gobierno, sin que se evidencien criterios de gestión integrada del recurso hídrico y equidad regional para las poblaciones locales.

  16. La conservación de la energía: un principio de toda la física. Una propuesta y unos resultados

    OpenAIRE

    Solbes Matarredona, Jordi; Tarín, Francisco

    2004-01-01

    Resumen. La conservación de la energía es uno de los conceptos más importantes de la física porque unifi ca todos los fenómenos. En este artículo presentamos algunos resultados de una investigación sobre el proceso de enseñanza-aprendizaje del concepto de energía y su conservación realizado en el nivel de la educación secundaria española. El análisis de los datos pone de manifiesto que la conservación de la energía se introduce en mecánica y termodinámica pero no en todos los campos de la fís...

  17. Principio de la conservación de la energía mecánica en caída libre

    OpenAIRE

    Carmona Franco, José Edgar; Amaya Díaz, José Alexander; Salcedo Rodríguez, Karen Lizeth

    2007-01-01

    Para estudiar el principio de la conservación de la energía mecánica utilizamos un movimiento uniformemente acelerado como lo es la caída libre, en el cual se puede mostrar como son las interacciones entre la energía cinética Ec y la energía potencial Ep, con relación a una altura arbitraria, y así poder demostrar la veracidad de este principio en dicho movimiento, registrando el tiempo empleado por un balín entre un electroimán y en sensor acústico por un cronómetro digital. To study the...

  18. La conservación de la energía : un principio de toda la física : una propuesta y unos resultados

    OpenAIRE

    Solbes Matarredona, Jordi

    2004-01-01

    La conservación de la energía es uno de los conceptos más importantes de la física porque unifica todos los fenómenos. En este artículo presentamos algunos resultados de una investigación sobre el proceso de enseñanza-aprendizaje del concepto de energía y su conservación realizado en el nivel de la educación secundaria española. El análisis de los datos pone de manifiesto que la conservación de la energía se introduce en mecánica y termodinámica pero no en todos los campos de la física. Los r...

  19. Modelización de consumos de agua y energía en hoteles de sol y playa

    Directory of Open Access Journals (Sweden)

    Gregorio Escalera Izquierdo

    2014-01-01

    Full Text Available El propósito de este artículo es el desarrollo de un método que permita a una cadena hotelera conocer el consumo actual y óptimo de sus hoteles, tanto de agua como de energía, uno a uno o por áreas, desarrollando una herramienta objetiva para obtener una disminución en sus suministros. Partimos de datos históricos de consumo en hoteles con estudiadas características comunes, creando un modelo matemático del consumo actual para cada hotel y para el conjunto de hoteles. Se obtienen modelos de consumo de agua y energía en función de la ocupación mediante regresiones lineales, validados por el cuadrado del coeficiente de correlación de Pearson y obteniendo un modelo hiperbólico final con un simple cambio de variable. Los modelos óptimos se calculan sin más que tomar como datos los valores mínimos de una serie de intervalos de ocupación.

  20. Modelización de materiales piezoeléctricos como generadores de energía

    Directory of Open Access Journals (Sweden)

    Vázquez Rodríguez, M.

    2012-02-01

    Full Text Available This paper presents the method to determine electrical equivalent models of piezoelectric materials used as electric power generating elements. The models developed from the experimental results have been used to obtain the type, amount and optimal topological structure of semiconductor elements needed in the input stage of the power generation system, and its behaviour under variable power supply demand.

    En este trabajo se presenta el estudio realizado para determinar los modelos eléctricos equivalentes de materiales de tipo piezoeléctrico, para evaluar su capacidad como elementos generadores de energía eléctrica. Los diferentes modelos desarrollados a partir de los resultados experimentales registrados, se han utilizado para obtener la estructura óptima de elementos semiconductores a utilizar en la etapa de entrada del sistema de generación y acumulación de energía eléctrica, teniendo en cuenta su morfología, tipo de semiconductor a utilizar y número necesario, así como su comportamiento ante una demanda variable de potencia a suministrar

  1. Regime internacional de mudanças climáticas e segurança energética

    Directory of Open Access Journals (Sweden)

    Cynthia Danielle Siqueira

    2012-03-01

    Full Text Available O presente artigo se propõe demonstrar a pertinência da cooperação, via regimes, como possibilidade plausível para lidar com problemas vinculados a segurança no setor energético, em detrimento ao uso da força e ações isoladas dos atores estatais no ambiente internacional. Propõe-se ainda centrar as atenções em um determinado regime internacional: o de mudanças climáticas. Esta escolha se dá pela percepção de que tal fenômeno pode influenciar na geração e intensificação de problemas relacionados ao acesso, uso e distribuição de energia e suas implicações políticas, econômicas, sociais e ambientais. Para tanto, será considerado, em linhas gerais, o contexto internacional e as demandas energéticas a serem tratadas pelo regime e como este lida com tais demandas em sua produção normativa.

  2. Redução do dispêndio energético e excesso de peso corporal em adolescentes

    Directory of Open Access Journals (Sweden)

    Frutuoso Maria Fernanda Petroli

    2003-01-01

    Full Text Available A contemporânea redução no dispêndio energético apresenta-se como fator determinante da atual epidemia de obesidade observada em centros urbanos. Em adolescentes esta modificação intensifica-se quando associada a atividades passivas de lazer, como assistir televisão, brincar com jogos eletrônicos e usar a Internet. Este trabalho procurou analisar a inatividade física e a influência da televisão na prática alimentar de adolescentes, aspectos preditivos ao excesso de peso. Participaram deste estudo 155 indivíduos com média de 11,5 ± 1,43 anos de idade. Os diagnósticos de sobrepeso e obesidade basearam-se no índice de massa corporal para adolescentes. Foram detectadas associações estatisticamente significativas entre apresentar sobrepeso e obesidade e praticar atividades passivas e consumir alimentos em frente à televisão para ambos os sexos. Estes achados mostraram que a inatividade física, associada ao aumento no consumo de alimentos energéticos enquanto assistem televisão ou em decorrência da influência de comerciais de produtos alimentícios por ela veiculados, representa um dos fatores determinantes para o desenvolvimento de peso corporal excessivo durante a adolescência.

  3. Conciencia ambiental y conducta sustentable relacionada con el uso de energía para iluminación

    Directory of Open Access Journals (Sweden)

    Graciela Lucía Tonello

    2015-06-01

    Full Text Available La conciencia ambiental es definida como un concepto multidimensional que constituye la dimensión actitudinal del comportamiento pro ambiental. En un contexto global y local de crisis energética, el presente trabajo tuvo como objetivos investigar las interrelaciones entre las diferentes dimensiones de la conciencia ambiental y la posible sustentabilidad detrás de conductas relacionadas con el uso de la iluminación, en una muestra de estudiantes universitarios. La metodología incluyó el desarrollo y administración de una encuesta con diferentes secciones para estimar la conciencia ambiental mediante escalas clasificatorias y preguntas sobre percepción de problemas ambientales, la atribución de responsabilidades, escalas estandarizadas de preocupación ambiental, conocimientos ambientales y la propensión al futuro como un rasgo de la personalidad sustentable. Los resultados en general muestran que la temática energética, al menos la referida a la iluminación tomada en este estudio, no es percibida como problemática ambiental sino como una problemática que afecta a nivel individual, y la perspectiva temporal de futuro evidenciada por la muestra está referida al tiempo futuro en sí mismo, más que como rasgo de personalidad sustentable.

  4. Desarrollo de una herramienta para validar la influencia del comportamiento del usuario sobre la eficiencia energética en edificios públicos de oficinas.

    Directory of Open Access Journals (Sweden)

    Alción de las Pléyades Alonso Frank

    2016-12-01

    Full Text Available La problemática ambiental global conduce a que numerosos países incorporen estrategias de Eficiencia Energética (EE a fin de disminuir el consumo de energía, aspecto que valoran mediante etiquetados o pasaportes de EE. Como hipótesis se considera que los usuarios de edificios son responsables del consumo de energía no previsto en la etapa de funcionamiento, por lo que el objetivo del presente trabajo es desarrollar y validar una herramienta de valoración del comportamiento de usuarios de espacios de trabajo en edificios públicos de oficinas. Para ello, se lleva a cabo un trabajo de campo en tres edificios ubicados en la ciudad de San Juan, Argentina. Se realizan encuestas a fin de evaluar los hábitos que el usuario emplea como estrategias para satisfacer su condición de confort térmico, en correlación con los consumos de energía registrados. Se elabora un indicador del Nivel de Eficiencia del Usuario (NEU y se transfiere a una etiqueta, a efectos de obtener una rápida aprehensión por parte del mismo. Los resultados reflejan variaciones en la frecuencia de uso de artefactos de climatización, apertura de puertas y ventanas, control de parasoles y cortinas y modificación de la ropa por los usuarios, llegando a observarse variaciones del consumo energético del edificio. Los valores obtenidos del NEU, permiten demostrar la eficiencia del comportamiento de usuarios en relación al cuidado de la energía.

  5. Integración de criterios de desempeños en el mejoramiento energético-ambiental de viviendas sociales existentes en Chile

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    Paulina Wegertseder Martínez

    Full Text Available En Chile, 75% del parque habitacional existente fue construido sin consideraciones energéticas-ambientales, convirtiéndose en altos consumidores de energía. Hoy existen medidas de mejoramiento energético para viviendas existentes, pero éstas solo consideran algunos desempeños con implicancia en la demanda energética, siendo cada uno mejorado de manera independiente, sin considerar la relación y el efecto que conllevan al estar integrados. Esta investigación propone cubrir una brecha de conocimiento, de cómo diferentes criterios de desempeños actúan integralmente en el mejoramiento energético-ambiental de una vivienda. Actualmente se carece de tal conocimiento, que bajo la filosofía prestacional, genera diversas estrategias de mejoramiento para objetivos de desempeños en climas templados: Confort Térmico, Eficiencia Energética por Calefacción y Calidad del Aire Interior. Se somete un caso de estudio en el centro-sur de Chile, a un diagnostico post-ocupacional (monitorizaciones, simulaciones dinámicas y encuestas de percepción, para establecer criterios de desempeños, cuya relevancia e interdependencia se analiza mediante un estudio multifactorial. Se concluye que para alcanzar dichos objetivos es implícito mejorar la vivienda bajo la integración de criterios como: aumento de hermeticidad al aire, disminución del valor de transmitancia térmico y entrega del caudal de ventilación mínimo; siempre en una solución holística y no aislada.

  6. Gasto energético na marcha em pacientes com mucopolissacaridose Energy expenditure during gait in patients with mucopolysaccharidosis

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    Marcos Almeida Matos

    2013-04-01

    Full Text Available OBJETIVO: Avaliar o gasto energético na marcha em pacientes com mucopolissacaridose, utilizando uma metodologia simples e aplicável ao ambiente clínico. MÉTODOS: Realizou-se estudo transversal comparando-se o gasto energético da marcha de 19 pacientes portadores de mucopolissacaridose (Grupo MPS com 19 indivíduos assintomáticos da comunidade (Grupo Comparação. O gasto energético foi mensurado em Cal por um relógio da marca Polar (modelo FT7 durante uma caminhada de 50 metros. Foram também avaliados idade, peso, altura, IMC, frequência cardíaca inicial, frequência cardíaca final, e tempo de marcha. RESULTADOS: O Grupo MPS teve gasto energético na marcha de 2,84 Cal(±1,01, versus 1,42 Cal(±0,51, sendo 100% maior que o Grupo Comparação; também em relação ao Grupo Comparação, o Grupo MPS teve frequência cardíaca inicial 22% maior, frequência cardíaca final 13% e tempo da caminhada 25% maiores. CONCLUSÕES: O gasto energético na marcha de pacientes com mucopolissacaridose é duas vezes mais alto em comparação com indivíduos assintomáticos e a metodologia usada para avaliação mostrou-se alternativa eficiente para o ambiente clínico convencional. Nível de Evidencia III, Estudo Transversal Comparativo.OBJECTIVE: The aim of this study is to evaluate energy expenditure during gait in patients with mucopolysaccharidosis using a simple methodology applicable to the clinical setting. METHODS: A cross-sectional study was carried out comparing energy expenditure during gait in 19 patients with mucopolysaccharidosis (MPS Group with 19 control individuals from the community (Comparison Group. Energy expenditure was measured in calories using a Polar telemetric watch (model FT7 in a 50-meters walking. Variables such as age, weight, height, BMI, initial hart rate, final hart rate, and gait time were recorded. RESULTS: MPS Group showed an expenditure during gait of 2.84 Cal (± 1.01 versus 1.42 Cal (± 0.51, being 100% higher

  7. Hibridación de fuentes de energía renovables no gestionables con sistemas de almacenamiento distribuido de aire comprimido o licuado

    OpenAIRE

    Soto Pérez, Fernando

    2016-01-01

    Esta Tesis tiene por objeto el estudio del almacenamiento en forma de aire (comprimido o licuado) de la electricidad generada mediante energía renovable no gestionable y que no se puede verter a la red por razones técnicas o de saturación. El interés de diferir la entrega de energía a la red, también se vincula a motivos económicos, al posibilitar la venta del kWh a un precio más alto. Con este fin, se ha considerado la posibilidad de utilizar un sistema de almacenamiento artificial que ...

  8. Auditoría energética de las instalaciones de la empresa ecuatoriana de artefactos S.A. “ECASA”

    OpenAIRE

    Cárdenas Ayala, Byron Mauricio

    2017-01-01

    Este proyecto realiza una auditoría energética en la empresa Ecuatoriana de Artefactos S.A. ECASA, que fabrica electrodomésticos de línea blanca. Se elabora una línea base del consumo energético actual por unidad producida, se identifican las oportunidades de mejora y se propone la ejecución de las mejoras con cero y bajo costo de implementación. Se entrega un plan de verificación de la implementación de las medidas propuestas. Se inicia el proceso con una evaluación sin mediciones para iden...

  9. Estimación de la huella energética en agroecosistemas cultivados con vid y ajo en Mendoza, Argentina

    OpenAIRE

    Santoni, Leonardo; Hidalgo, Verónica P.; Filippini, María Flavia; Gennari, Alejandro J.

    2015-01-01

    A nivel mundial, los cultivos de mayor importancia como maíz, trigo, soja y girasol presentan una huella energétic aconocida. En Mendoza, Argentina, aún no han sido estudiados los principales cultivos de importancia socio-económica para la región, como la vid (Vitis vinifera L.), especie perenne y el ajo (Allium sativum L.), especie anual, manejados en agroecosistemas convencionales. La presencia de indicadores energéticos como Eficiencia (EE), Balance (BE) y Productividad (PE), permiten obte...

  10. El etanol carburante en la costa norte del Perú. Impactos energético, ambiental y socioeconómico

    OpenAIRE

    Lizana Bobadilla, Víctor Manuel

    2016-01-01

    EL Perú es un país Iberoamericano que desde fines de la década de los 90 ha experimentado un crecimiento notable y sostenido debido a la reactivación económica y al desarrollo de algunos de sus sectores productivos principales como la minería, la industria, la construcción y el transporte. En este marco, el sector energético ha cumplido un papel importante para satisfacer el incremento de la demanda energética nacional. Perú se ha caracterizado por una elevada dependencia de los combusti...

  11. Primera Aproximación Para El Aprovechamiento Y Generación De Energía Con Gas Natural Desde Mecanismo De Desarrollo Limpio (MDL

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    Diego Rosas Cadena

    2015-01-01

    Full Text Available Este artículo presenta un panorama referente aplicaciones de Mecanismos de desarrollo limpio (MDL a nivel regional y nacional enfocado a la recuperación de energía. Con base en este panorama se presenta una aproximación del desarrollo de proyectos de aprovechamiento y generación  de energía a partir del uso de gas natural y su elegibilidad como MDL, tomando como base las metodologías existentes aprobadas por la Convención Marco de las Naciones Unidas (CMNUCC.

  12. Modelo de simulación del consumo de energía eléctrica doméstica

    OpenAIRE

    Les Aguerrea, Íñigo

    2015-01-01

    El objetivo de este proyecto fin de carrera es el desarrollo de un modelo de simulación del consumo de energía eléctrica en el hogar que sirva como herramienta para despertar un pensamiento crítico sobre sostenibilidad y uso eficiente de la energía. Para ello se ha prestado especial atención en crear un modelo de simulación que permita la incorporación interactiva de decisiones por parte del usuario y que muestre las consecuencias de tales decisiones. De esta forma, se ha focalizado en dotar ...

  13. Análisis de un plan de ahorro energético implementando sistemas fotovoltaicos para los modelos de vivienda propuestos por el gobierno nacional

    OpenAIRE

    Quinto Ayovi, Marlon Jamil; Cadena Avila, Diego Alberto

    2016-01-01

    En el siguiente artículo se muestran los diseños de los sistemas fotovoltaicos que se desean implementar a las viviendas modelos propuestas por el gobierno nacional con la finalidad de obtener un ahorro energético a mediano o largo plazo utilizando fuentes de energías renovables como lo es el sol. Se procede a realizar dos escenarios, en el primero escenario se consideran todas las cargas de la vivienda modelo y en el segundo escenario se considera como carga solo a la cocina de inducción, en...

  14. Comparación de recursos energéticos residenciales en las ciudades de Valdivia (Chile) y Bariloche (Argentina): precios y consumos

    OpenAIRE

    Schueftan, Alejandra; Gonzalez, Alejandro Daniel

    2016-01-01

    Se investigó la disponibilidad de recursos energéticos en el sector residencial de Valdivia en Chile y de Bariloche en Argentina. Se compararon los precios de los recursos y los consumos promedio. En ambos casos, el requerimiento principal es en calefacción, para la cual en Valdivia en su mayoría se usa leña, y en Bariloche gas natural, en ambos casos con los precios relativos menores. Por unidad de energía y de salario el gas natural en Bariloche resulta 12 veces más barato que la leña e...

  15. Red de nodos sensores y actuadores para control y supervisión de consumo de energía en dispositivos electrodomésticos

    OpenAIRE

    Peretti, Gastón; Gallina, Sergio Hilario; Felissia, Sergio Francisco; Villagrán, Luis Daniel; Beltramini, Paola; Herrera, Martín

    2013-01-01

    En la actualidad existen una gran variedad de sistemas domóticos que utilizan distintos protocolos para controlar los dispositivos hogareños, pero no existen desarrollos que integren la medición de energía en tiempo real de cada dispositivo y el control sobre los mismos al mismo tiempo. El presente proyecto pretende desarrollar una red de nodos sensores y actuadores configurables en tiempo real, que permitan implementar funciones de control y supervisión de consumo energético de artefactos y ...

  16. Análisis y propuesta de mejoras para la eficiencia energética del edificio principal del Instituto c.c. Eduardo Torroja-CSIC

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    Martín-Consuegra, F.

    2014-12-01

    Full Text Available As part of the 80th anniversary of IETcc-CSIC, a proposal for the rehabilitation of the 1953 building is made. The analysis of the main building’s energy performance concludes that it is not energy efficient. Energy efficiency improvement measures based on European directives are proposed, It is recommended to incorporate them step by step, starting with passive measures to reduce energy needs. Afterwards active measures, such as improving the performance of facilities, are proposed, so that the least possible amount of final energy is used to meet the comfort standards. To complete the operation, the use of renewable energy sources is proposed to reduce the consumption of non-renewable primary energy. Energy and building rehabilitation improvement measures in the IETcc-CSIC should be demonstrators for other public buildings with heritage values.En el marco del 80 aniversario del IETcc-CSIC se elabora una propuesta para la rehabilitación del edificio construido en 1953. Partiendo del análisis del comportamiento energético del edificio principal, se concluye que este no es eficiente energéticamente. Se proponen mejoras para la eficiencia energética del edificio tomando en cuenta las directivas europeas. Se recomienda incorporar las mejoras de forma escalonada, comenzando por las medidas pasivas para reducir sus necesidades energéticas. A continuación se proponen medidas activas, como la mejora del rendimiento de las instalaciones, de manera que se emplee la menor cantidad posible de energía final para satisfacer el confort de los usuarios. Para completar la intervención se propone el uso de fuentes de generación de energías renovables en la parcela con el objetivo de reducir el consumo de energía primaria no renovable. Las acciones para la rehabilitación energética e integral del edificio del IETcc-CSIC, deben ser demostradoras para otros edificios públicos con valores patrimoniales.

  17. Proyecto Arquitectónico Energéticamente Eficiente Mediante Gramáticas de Formas y Aprendizaje por Refuerzo

    OpenAIRE

    Gavilanes-Velaz-de-Medrano, Juan; Hidalgo, Pablo; Belmonte, David; Mandow-Andaluz, Lorenzo; Ruiz-Montiel, Manuela

    2015-01-01

    En este trabajo presentamos un sistema para la generación de esquemas de viviendas unifamiliares energéticamente eficientes. Los esquemas se sintetizan mediante la ejecución de gramáticas de formas simples, entrenadas por medio de técnicas de aprendizaje por refuerzo, teniendo en cuenta criterios tanto de habitabilidad como de eficiencia energética. Los resultados obtenidos son analizados y validados Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.

  18. Avances en el desarrollo y aplicación metodológica tendiente a fortalecer la sustentabilidad energética de áreas suburbanas

    OpenAIRE

    Viegas, Graciela

    2008-01-01

    Este trabajo presenta los avances desarrollados en una beca de investigación otorgada por el CONICET (Consejo Nacional de Investigaciones Científicas y Tecnológicas) titulada: “Fortalecimiento de la sustentabilidad energética en áreas urbanas de media y baja consolidación”. Como objetivo se planteó entender el comportamiento energético en la situación actual de áreas urbanas homogéneas del partido de La Plata a partir de la selección de sectores urbanos reducidos entendidos como Mosaicos Urba...

  19. Implementació de criteris d'optimització energètica en vivenda unifamiliar contemplant l'ús d'energia solar fotovoltaica

    OpenAIRE

    Guàrdia Fargues, Clara

    2017-01-01

    Aquest projecte ofereix un mètode per tal d’optimitzar energèticament un habitatge unifamiliar. Aquest estudi contempla millorar els consums de l’habitatge i instal·lar un sistema híbrid connectat a la xarxa format per panells fotovoltaics, bateries i un generador dièsel. Aquest sistema es dissenyarà tenint en compte criteris de rendibilitat econòmica i eficiència energètica. Per la realització d’aquest projecte s’ha considerat la metodologia de la ISO 50001, que té com a objectiu la millo...

  20. Eficiencia energética en microempresas de Medellín: un estudio de valoración de barreras

    OpenAIRE

    Juan Gabriel Vanegas López; Sergio Botero Botero

    2012-01-01

    La difusión y penetración de medidas de uso eficiente de energía tienen impactos positivos tanto sobre la competitividad como sobre las condiciones de seguridad de las firmas. Empero, tales impactos son difíciles de alcanzar en la práctica debido a la presencia de barreras que limitan la toma de decisiones por parte de los agentes económicos. Este trabajo identifica, evalúa y valora una serie de barreras al uso eficiente de energía en microempresas de Medellín (Colombia). Mediante el método P...

  1. Incentivos fiscales para fomentar actuaciones de mejora en la eficiencia energética de viviendas de construcción antigua

    OpenAIRE

    Villca Pozo, Milenka

    2017-01-01

    Atendiendo a los objetivos que persigue el Real Decreto 235/2013, de 5 de abril, en relación con la exigencia de la certificación de eficiencia energética de las edificaciones nuevas y antiguas, desde el panorama tributario, se analiza si existen incentivos fiscales que promuevan la eficiencia energética de los edificios de construcción antigua. Del análisis de la normativa de los tributos que inciden en la propiedad, como son el Impuesto sobre el Patrimonio e Impuesto sobre Bienes Inmuebles,...

  2. Planes de control de la calidad de medición de energía eléctrica a los usuarios en la Argentina

    OpenAIRE

    García, Jorge; Issouribehere, Pedro; Layerenza, Guillermo O.

    1996-01-01

    En la Argentina la reciente privatización de los servicios de distribución de energía eléctrica ha modificado las reglas del control de la calidad de la medición de la energía eléctrica a los usuarios. Anteriormente el control de los planteles era propio de las empresas. Actualmente el Ente Regulador debe asegurar el cumplimiento de normas de calidad. Se explican las pautas adoptadas para el seguimiento estadístico de la calidad de medición para un servicio de 5.000.000 de usuarios.

  3. Consumo de bebidas energéticas, alcohólicas y azucaradas en jóvenes universitarios de la frontera México-USA

    OpenAIRE

    Gómez-Miranda, Luis Mario; Bacardí-Gascón, Montserrat; Caravalí-Meza, Nuris Yohana; Jiménez-Cruz, Arturo

    2015-01-01

    Introducción: El consumo de bebidas azucaradas, energéticas y alcohólicas en universitarios puede ser un riesgo para la salud. Objetivo: Determinar el consumo de bebidas azucaradas, energéticas, y alcohólicas y compararlo con el estado del IMC en universitarios. Metodología: Se evaluaron estudiantes de segundo y tercer año de la UABC. Se midieron el peso, la talla y la circunferencia de cintura, y se calculó el IMC. Se aplicó un cuestionario sobre consumo de 19 bebidas. Resultados: Participar...

  4. Soluções energéticas para as cadeias produtivas de frango de corte e da suinocultura na Zona da Mata de Minas Gerais

    OpenAIRE

    Ferrarez, Adriano Henrique

    2015-01-01

    A questão energética é um dos pontos centrais do conceito de desenvolvimento sustentável, entendido como o processo que busca satisfazer as necessidades do presente sem comprometer o futuro. A energia está presente em todas as ações de nossa vida cotidiana sendo, portanto, fundamental conhecer e dominar as técnicas de geração e conversão energéticas visando garantir a preservação do meio ambiente e o desenvolvimento social. O esgotamento das reservas de petróleo e os impactos ambientais causa...

  5. Influencia de la molienda en la energía superficial de fritas para esmaltes

    Directory of Open Access Journals (Sweden)

    Tamayo, A.

    2013-04-01

    Full Text Available In this work has been studied the influence of the milling process of two ceramic frits used in the ceramic tile industry. Both glass frits were of similar chemical composition changing SiO2 by 5% of B2O3 and both of them were water or dry milled. Glass frit surfaces were characterized by FT-IR, Karl-Fischer (K-F titration and Inverse Gas Chromatography at Infinite Dilution (IGC-ID. By K-F titration it was observed that water milled frits presented 28 and 26 OH groups for 100 A2 if they do not contain or contain boron, respectively. These surface changes are also observed by IGC-ID. Thus, the glass frit without boron and dry milled presented the highest dispersive surface energy (44 mJ.m-2 and the less acidic constant (0.13 kJ.mol-1. Both glass frits are amphoteric with acidic and base surface active sites, and that frit without boron presents the higher basicity. Milling process influences in the acid-base surface characteristics of both frits by increasing the basicity for the one without boron and increasing for the other one. This has been assigned to the different location of hydroxyl groups where the higher interaction is the one that does not contain boron and dry milled as K-F results.Se ha estudiado el proceso de molienda en dos fritas de la industria cerámica. Las dos fritas, de composiciones similares pero en una se ha sustituido parte de la sílice por 5% de óxido de boro, fueron molidas por vía seca o húmeda y se caracterizaron mediante FT-IR, valoración Karl-Fischer e IGC-ID. Mediante valoración se han determinado los contenidos en moléculas de agua e hidroxilos. El mayor contenido en hidroxilos lo posee la frita sin boro seguida de la de boro ambas molidas en húmedo, poseyendo 28 y 26 grupos OH por cada 100 A2, respectivamente. Estos resultados coinciden con IGC-ID, sin embargo es la frita sin boro molida en seco la de mayor energía superficial (44 mJ.m-2 y constante ácida (0.13 kJ.mol-1. Aunque las dos fritas tienen

  6. Demandas energéticas en el bailaor norteamericano profesional de flamenco.

    Directory of Open Access Journals (Sweden)

    M. Elizabeth Pedersen

    2013-05-01

    Full Text Available El objetivo de este estudio ha sido examinar la capacidad aeróbica y anaeróbica de bailaores estadounidenses profesionales de flamenco, con el fin de conocer las necesidades energéticas de esta danza. La muestra estudiada estaba formada por 11 bailaores profesionales de flamenco de Albuquerque, Nuevo Méjico (4 hombres y 7 mujeres. Se han registrado 3 variables: la composición corporal, medida con un adipómetro calipers; el consumo máximo de oxígeno (VO2max estimado mediante el análisis de gases durante un test de esfuerzo progresivo; y la capacidad anaeróbica, calculada a través del test de Wingate. La edad media de los bailaores fue de 28.45 años (22-44 años y el tiempo medio que llevaban participando en espectáculos flamencos era de 13.5 años (2-40 años. Respecto a la composición corporal, los participantes presentan datos de porcentaje de grasa corporal (GC inferior a la media, tanto la muestra masculina, 9.96% GC (5,25-13,09% GC, como la femenina, 16.35% GC (12,96-20,17% GC. La media máxima de capacidad aeróbica fue de 51.63 mlO2•kg–1•min–1 para los hombres (40.7-59,5 mlO2•kg–1•min–1 y 38,78 mlO2•kg–1•min–1 para las mujeres (32.9-43,8 mlO2•kg–1•min–1, en ambos casos por encima de la media. La potencia máxima media registrada en el test de Wingate, fue de 16.2 W/kg (13.7-18.3 W/kg y 11.3 W/kg (8.6 hasta 14.3 W/kg para hombres y mujeres, respectivamente, con un índice de fatiga del 65.5% (62-74% para los hombres y 56.1% (35.2-68.1% para las mujeres. Estos resultados son superiores, casi en un 25 %, a otros datos publicados sobre deportistas que realizan actividades anaeróbicas. Por lo tanto, los bailaores de flamenco tienen una considerable potencia anaeróbica. Atendiendo en los resultados de este estudio, se sugiere que el entrenamiento de bailaores incluya componentes aeróbicos y anaeróbicos.

  7. Diagnóstico de qualidade e balanço energético na produção de pupunheira em propriedades familiares na região do Caparaó.

    Directory of Open Access Journals (Sweden)

    Bruno Fardim Christo

    2014-04-01

    Full Text Available Estudos que apontem o fluxo energético dos sistemas de cultivo são de grande importância para a produção agrícola a fim de atingir uma agricultura mais sustentável. O objetivo deste trabalho foi caracterizar a eficiência energética na produção de palmito de pupunha através do balanço energético do sistema e de indicadores de qualidade, em duas propriedades familiares no município de Alegre/ES. Foram adotadas metodologias participativas para promover maior interação com o agricultor e sua família, e consequentemente obter maior volume de informações para a coleta de dados. O balanço energético foi realizado pela diferença entre os gastos energéticos (entrada e a produção alcançada (saída. A propriedade 1 apresentou balanço energético positivo e superiores indicadores de qualidade, já a propriedade 2 apresentou balanço energético negativo e inferiores diagnóstico de qualidade. A propriedade 1 apresentou maior eficiência energética mostrando estar usando melhor os seus recursos na produção da pupunheira.

  8. Manipulation of polyatomic molecules with the scanning tunnelling microscope at room temperature: chlorobenzene adsorption and desorption from Si(111)-(7 x 7)

    International Nuclear Information System (INIS)

    Sloan, P A; Palmer, R E

    2006-01-01

    We report the imaging of chlorobenzene molecules chemisorbed on the Si(111)-(7 x 7) surface at room temperature with the scanning tunnelling microscope, and the desorption of the molecules by the tunnelling current. Detailed voltage-dependent imaging (at positive bias) allows the elucidation of the number and orientation of all the adsorbate configurations in the 7 x 7 unit cell. At negative bias the adsorbate was observed to affect the imaging properties of neighbouring half unit cells. The threshold voltage required for desorption of the chlorobenzene molecules was invariant to small changes in the tip-state, the adsorption site (corner adatom, middle adatom, faulted or unfaulted half of the unit cell) and the kind of doping of the substrate (n or p type)

  9. Uso de la energía eólica dentro del concepto de generación distribuida y la calidad de la energía; Use of Wind Energy Inside Distributed Generation Concept and Power Quality

    Directory of Open Access Journals (Sweden)

    Enileys Guardado Pérez

    2011-02-01

    Full Text Available La conexión de los parques eólicos a las redes eléctricas presenta diversos problemas. Estos no solo sederivan de la naturaleza del elemento de conversión electromecánico de energía (la máquina asíncrona yde la característica aleatoria de la fuente de energía primaria (el viento, sino que tienen relación directatambién con las condiciones de la red y la calidad de la energía (CEL presente en la misma. Estosproblemas pueden tener diferente impacto dependiendo de las características de la red a la que estáconectado el parque: red aislada o sistema interconectado. En cualquier caso, la conexión de un PE a unared requiere la realización de estudios detallados tanto de régimen permanente como de régimen dinámicopara valorar con precisión su impacto. En el presente trabajo se hace un análisis de la presencia de los PEdentro de la generación distribuida (GD, su relación con la CEL, así como se presentan los primerosesfuerzos por analizar el comportamiento de las turbinas eólicas ante una de las perturbaciones másusuales que se presentan en la red eléctrica cubana: la variación de tensión.  Some problems could be present when a wind farm (WF is connected to one electric network. Theseproblems not be only related with the nature of electromechanical conversion of energy element or randomizenature of wind; they are too related with the really conditions of the network and power quality problems.The impact of these problems could be different depending of the electric network characteristics: isolated(islanding or connected network. Nevertheless the connection of WF to one electric network to evaluateits impact some studies about dynamic and stable states will be realized.One analysis about the presenceof WF inside distributed generation concept, its relations with power quality problems and some resultsobtained at CIPEL on performance of wind turbines considering one of the most perturbations in electriccuban system are

  10. Small hydro

    International Nuclear Information System (INIS)

    Bennett, K.; Tung, T.

    1995-01-01

    A small hydro plant in Canada is defined as any project between 1 MW and 15 MW but the international standard is 10 MW. The global market for small hydro development was considered good. There are some 1000 to 2000 MW of generating capacity being added each year. In Canada, growth potential is considered small, primarily in remote areas, but significant growth is anticipated in Eastern Europe, Africa and Asia. Canada with its expertise in engineering, manufacturing and development is considered to have a good chance to take advantage of these growing markets

  11. Densidade energética da dieta e ingestão energética total segundo consumo de adoçantes e/ou alimentos processados com adoçantes

    OpenAIRE

    Carolina Faria Tavares

    2013-01-01

    Introdução. O consumo de açúcares aumentou consideravelmente nas últimas décadas, bem como a incidência e a prevalência da obesidade, gerando a elaboração de recomendações para moderá-lo. Os açúcares contribuem para a palatabilidade dos alimentos, podendo também aumentar sua densidade energética (DE), outro fator de risco para obesidade. Uma alternativa seria a substituição por adoçantes não calóricos, que também aumentam a palatabilidade dos alimentos, porém são isentos calorias. No entanto,...

  12. Diseño de un sistema de gestión energética basado en la norma ISO 50001 de eficiencia energética en Continental Tire Andina

    OpenAIRE

    Urdiales Flores, Cristian Gerardo

    2016-01-01

    RESUMEN Estudio realizado en “Continental Tire Andina”, planta de manufactura de neumáticos ubicada en el Km 2.8 de la Panamericana Norte de la ciudad de Cuenca, de la mano de políticas de innovación, se llevó a cabo la Planificación y Diseño del Sistema de Gestión Energética para sus instalaciones, con el objetivo de medir su desempeño e identificar posibilidades de mejora en cuanto a activos eléctricos, térmicos, aire comprimido y agua de enfriamiento dentro de las instalaciones de produ...

  13. Sistemas híbridos con base en las energías renovables para el suministro de energía a plantas desaladoras / Hybrid systems with base in the renewable energy for the energy supply to desalination plants.

    Directory of Open Access Journals (Sweden)

    Deivis Ávila‐Prats

    2011-01-01

    Full Text Available En el siguiente trabajo se modelan los sistemas híbridos con base en las energías renovables, quegaranticen las necesidades energéticas en plantas desaladoras de ósmosis inversa, con unacapacidad de hasta 50 m3 de producción diaria, a fin de obtener la combinación óptima. Para elprocesamiento de los datos se hará uso del software especializado HOMER. Se tomarán comoelementos de partida: la demanda eléctrica de una planta desaladora tipo, las especificacionestécnicas de los equipos propuestos, así como los potenciales de radiación solar y las velocidades deviento de la región analizada (Islas Canarias.Las conclusiones muestran que el sistema híbrido óptimo, desde el punto de vista técnico-económicopara el suministro de energía a desaladoras de ósmosis inversa con capacidad de producción de 50m3/día, será un sistema eólico- diesel, compuesto por: dos aerogeneradores, un banco de baterías yun generador diesel. Se demuestra que la velocidad del viento es la variable termodinámicadeterminante para la configuración de los sistemas híbridos estudiados, considerando los potencialesenergéticos naturales existentes en la región estudiada.Palabras claves: desalinización, ósmosis inversa, HOMER, Islas Canarias, sistemas híbridos, energíasrenovables._____________________________________________________________________AbstractIn the following work the hybrid systems with base in the renewable energy are modeled, to comparemany different design options based on their technical and economic merits. The energy necessitieswill be guaranteed in reverse osmosis desalination plants, with a capacity of up to 50 m3 of dailyproduction. The data processing was analyzed using the computer model, HOMER. The departureelements were: the electric demand of the desalination plant, the technical specifications of theequipments, as well as the potentials of solar radiation and the speeds of wind of the analyzed region(Canary Island

  14. Las puzolanas y el ahorro energético en los materiales de construcción

    Directory of Open Access Journals (Sweden)

    Soria Santamaría, Francisco

    1983-09-01

    Full Text Available This discussion commences with some general comments on the energy crisis and its impact on the cement industry, with the corresponding coal reconversion problems. Three factors are highlighted where saving has been centered: technological process, raw materials and finished product, emphasizing the interest of latter which includes incorporating active additions in Portland cement. A quick review then follows about pozzolanas, their origin, definitions and classification. Their chemical composition is underlined, and the concept of pozzolanic activity is described. Later on, pozzolanic cements, their most significant properties and the advantages of using pozzolana are explained. After a lengthy description about possible applications of pozzolanas and pozzolanic cements, the conclusion reviews current trends in international standards for such cements and possible evolution in consumption of additions by the year 2000, with a view to saving more energy, without impairing the essential properties of the cement.

    Comienza esta exposición con unas consideraciones generales sobre la crisis energética y su impacto en la industria cementera, con los correspondientes problemas de reconversión al carbón. Se mencionan los tres aspectos en que se ha centrado el ahorro energético: proceso tecnológico, materias primas y producto acabado, destacando el interés de este último que incluye la incorporación de adiciones activas al cemento portland. Se hace a continuación un rápido comentario sobre puzolanas, su origen, definiciones y clasificación. Se destaca la composición química de las mismas y se desarrolla el concepto de actividad puzolánica. Más tarde se hace una exposición sobre cementos puzolánicos, sus propiedades más destacadas y las ventajas que supone el empleo de la puzolana. Tras una exposición amplia de las posibles aplicaciones de las puzolanas y cementos puzolánicos, se concluye comentando las tendencias

  15. El espejismo de una energía social. La economía del hidrógeno

    Directory of Open Access Journals (Sweden)

    Valero Matas, Jesús A.

    2010-08-01

    Full Text Available This paper is a critical examination of proposals for a “hydrogen economy.” In Jeremy Rifkin’s The Hydrogen Economy (2002 such an economy was proposed as a solution to the many problems associated with the use of fossil fuels including the dangers of global climate change. The promise has been echoed since by many others who have been concerned by energy policy. Hydrogen has increasingly been viewed as a “dorado” energy that would greatly benefit all humanity, especially the most disadvantaged. But the golden age of energy has not yet appeared and may never do so. There are multiple problems in the development of a hydrogen economy. One of these problems concerns social impacts, which have especially been ignored. It is the potential social impacts of a hydrogen economy that are given special attention here, in order to explore some of the reasons for doubting that the social economy of hydrogen will be able to realize the many hopes associated with it.

    El texto reflexiona sobre la economía del hidrógeno. Una esperanza que abrió Rifkin en su obra La economía del hidrógeno (2002 como solución a los carburantes fósiles y al efecto invernadero. Este nuevo “dorado” energético que iba a solucionar los problemas energéticos de la humanidad, en especial a los más desfavorecidos, no ha llegado, y posiblemente nunca llegue en los términos de Rifkin. Las cuestiones que impiden desarrollar la economía del hidrógeno son múltiples, entre ellas sus impactos sociales. La divulgación de las tesis de Rifkin abrieron la esperanza a muchos sectores de la sociedad, y tras el paso de los años esto no se ha cumplido y está lejos de hacerse realidad. Se exponen algunas razones por las cuales la economía “social” del hidrógeno no podrá convertirse en esa energía de salvación social.

  16. La energía electrica, dentro de la estructura tecnológica de la industria antioqueña

    Directory of Open Access Journals (Sweden)

    Gustavo López Alvarez

    1991-07-01

    Full Text Available En este artículo se presenta una visión general de la estructura tecnológica de la industria antioqueña en su conjunto para el periodo 1975-1987. Para el análisis se supone una función de producción en dos niveles: en el primero se emplean como insumos el capital, el trabajo, los energéticos y otras materias primas; en el segundo, los energéticos son desagregados en electricidad y otros. Usando una función translogarítmica de costos para cada uno de los niveles, se llega, finalmente, a presentar estimaciones de las elasticidades precio directas y cruzadas que darían cuenta de las relaciones económicas entre los insumos. Examinando los resultados de las estimaciones se observa que las elasticidades directas son todas negativas, el capital y los insumos energéticos son sustitutivos, mientras que la única complementariedad se presenta entre el trabajo y los insumos energéticos.

  17. Conflictos socioambientales en torno a la energía nuclear. Perspectivas desde la Investigación para la Paz

    Directory of Open Access Journals (Sweden)

    Luis Sánchez Vázquez

    2011-06-01

    Full Text Available En los últimos años se ha reactivado el debate sobre la energía nuclear. Esta opción ha reemergido amparada en la etiqueta de «energía limpia», por la no emisión de gases de efecto invernadero en su proceso productivo. Sin embargo, la incertidumbre sobre las fases de tratamiento necesarias para administrar con seguridad los residuos, incluyendo, en su caso, el reprocesado del combustible; los problemas ambientales derivados de la minería del uranio; e incluso los riesgos laborales derivados del trabajo con material fisionables, componen un panorama de situaciones conflictivas de carácter complejo que continúa siendo el principal caballo de batalla de la oposición antinuclear y ecologista. En este artículo se pretenden identificar los distintos conflictos socioambientales aparejados a la energía nuclear teniendo en cuenta su ciclo de vida completo, con el objetivo aportar soluciones al debate sobre la problemática ambiental en torno a la energía nuclear desde la perspectiva de la Investigación para la Paz.

  18. Proyecto de Investigación del IETcc para el ahorro de energía en edificación bajo condiciones variables de clima y uso

    Directory of Open Access Journals (Sweden)

    García Arroyo, Arturo

    1981-03-01

    Full Text Available Las tres cuartas partes del consumo anual de energía en España proceden del exterior, lo que sitúa al país en el sexto lugar de los importadores de petróleo, después de EE.UU., Japón, Alemania, Francia e Italia.

  19. Situação Energética no Estado do Rio de Janeiro e o Capim-Elefante como Fonte Renovável

    Directory of Open Access Journals (Sweden)

    Antonio Alonso Cecon Novo

    2016-12-01

    Full Text Available Esta revisão aborda a situação energética no Estado do Rio de Janeiro e também outras fontes alternativas de energia que vêm se destacando, como por exemplo, o capim-elefante. Foi realizado um breve relato sobre as fontes para geração de energia que tiveram um papel importante para o setor energético. Dentre as principais fontes para fins energéticos, o capim-elefante tem sido muito utilizado em pesquisas pela Universidade Estadual Norte Fluminense – UENF, na obtenção de cultivares mais produtivas para o desenvolvimento econômico principalmente da região Norte e Noroeste Fluminense. Este trabalho destaca as principais fontes de energia, com ênfase para o capim-elefante na matriz energética, com a produção de biomassa para geração de energia.

  20. Evaluación a través del presupuesto de la energía incorporada al proyecto de edificación

    Directory of Open Access Journals (Sweden)

    Antonio Freire Guerrero

    2015-06-01

    Full Text Available Conocido es el alto impacto ambiental que tiene la construcción de edificios. Para poder tomar decisiones que lo disminuyan este debe ser cuantificado desde la etapa de diseño por lo que es necesario contar con herramientas sencillas de implementar. En el sector son empleadas de forma generalizada las bases de costes, las que se presentan como vehículo de incorporación del impacto ambiental. Se utiliza el caso particular de la Base de Costes de la Construcción de Andalucía (BCCA para demostrar, de forma estructurada, la incorporación de los costes energéticos (energía incorporada en los presupuestos de los proyectos. De forma novedosa se propone también incluir los costes energéticos del alimento de los trabajadores durante su jornada laboral y su movilidad, los que pueden llegar a representar desde un 5% a un 20% del total. Por último, se evalúa la energía incorporada en los costes indirectos de la obra que pueden ser significativos y que suelen ser obviados en los análisis.

  1. Análisis del potencial energético solar en la Región Caribe para el diseño de un sistema fotovoltaico

    Directory of Open Access Journals (Sweden)

    Adalberto José Ospino Castro

    2010-01-01

    Full Text Available La utilización de los rayos solares para la generación de energía eléctrica se ha incrementando en los últimos años, debido principalmente al cambio climático, por tanto es importante demostrar que para la región Caribe existe potencial energético derivado del aprovechamiento de la radiación solar para la utilización de sistemas renovables de energía. Para el proyecto se toma como muestra para el estudio del potencial energético el departamento del Atlántico basado en los mapas de radiación solar de Colombia diseñados por el IDEAM, ya que los mismos permiten obtener parámetros de construcción, y viabilidad técnica. Como resultado se obtiene una metodología que permite establecer los parámetros a tener en cuenta para el desarrollo de los sistemas renovables fotovoltaicos y se realiza a futuro el estudio de viabilidad técnico-económico de implementación de estos sistemas seleccionando el área adecuada obteniendo la tecnología adecuada a las condiciones de la región.

  2. Papel de la leptina como señal aferente en la regulación de la homeostasis energética

    Directory of Open Access Journals (Sweden)

    José María Basain Valdés

    Full Text Available La obesidad es una enfermedad crónica caracterizada por un aumento patológico de grasa corporal generado por un desbalance entre los ingresos y los egresos energéticos; este exceso de energía se almacena en el tejido adiposo, el cual no solo almacena lípidos, sino que secreta numerosas hormonas, por lo que constituye el órgano endocrino de mayor tamaño del organismo. A diferencia de otras glándulas endocrinas, su masa es variable y puede aumentar o disminuir progresivamente de tamaño dependiendo de la edad, la ingesta alimentaria, la actividad física, la programación perinatal y la predisposición genética; se destaca dentro de los factores secretados la leptina, la cual participa en la regulación del balance energético y la secreción de gonadotropinas.El objetivo de la presente revisión bibliográfica es describir el papel de la leptina como señal aferente en la regulación de la homeostasis energética, y se destaca su importancia como uno de los mecanismos implicados en la patogénesis de la obesidad.

  3. Creación de base de datos para proyectos multisite de eficiencia energética en el sector de las telecomunicaciones

    OpenAIRE

    Izquierdo Balaciart, Berta

    2017-01-01

    En este trabajo se pretende crear una base de datos para una ingeniería de eficiencia energética para proyectos en el sector de las telecomunicaciones para optimizar el tratamiento de datos y reducir el tiempo dedicado a ello en cada una de las fases del proyecto.

  4. Magnetospheric Convection Electric Field Dynamics and Stormtime Particle Energization: Case Study of the Magnetic Storm of May 4,1998

    Science.gov (United States)

    Khazanov, George V.; Liemohn, Michael W.; Newman, Tim S.; Fok, Mei-Ching; Ridley, Aaron

    2003-01-01

    It is shown that narrow channels of high electric field are an effective mechanism for injecting plasma into the inner magnetosphere. Analytical expressions for the electric field cannot produce these channels of intense plasma flow, and thus result in less entry and energization of the plasma sheet into near-Earth space. For the ions, omission of these channels leads to an underprediction of the strength of the stormtime ring current and therefore an underestimation of the geoeffectiveness of the storm event. For the electrons, omission of these channels leads to the inability to create a seed population of 10-100 keV electrons deep in the inner magnetosphere. These electrons can eventually be accelerated into MeV radiation belt particles.

  5. 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine inhibits proton motive force in energized liver mitochondria

    International Nuclear Information System (INIS)

    Singh, Y.; Bhatnagar, R.; Sidhu, G.S.; Batra, J.K.; Krishna, G.

    1989-01-01

    It is known that 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), which induces Parkinson's-like disease in primates and humans, depletes hepatocytes of ATP and subsequently causes cell death. Incubation of rat liver mitochondria with MPTP and 1-methyl-4-phenyl pyridinium ion (MPP+) significantly inhibited incorporation of 32 Pi into ATP. MPTP and MPP+ inhibited the development of membrane potential and pH gradient in energized rat liver mitochondria, suggesting that reduction of the proton motive force may have reduced ATP synthesis. Since deprenyl, an inhibitor of monoamine oxidase, prevented the formation of MPP+ and inhibited the decrease in membrane potential caused by MPTP, but not that caused by MPP+, these effects of MPTP, as well as cell death, probably were mediated by MPP+. This mechanism may play a role in the specific loss of dopaminergic neurons resulting in MPTP-induced Parkinson's disease

  6. Los límites de la alteridad: el otro desde la energética social

    Directory of Open Access Journals (Sweden)

    Alain G. Jullian Montañez

    2015-01-01

    Full Text Available La alteridad ha sido abordada desde varias perspectivas, como la educación, el lenguaje, la psicopedagogía, la psicología, la sociología, la antropología o la filosofía, por lo que se ha considerado necesario efectuar una recapitulación de los avances en el tema. Al llevar a cabo esa revisión, se hizo evidente que ninguna de las perspectivas aporta una base material al “problema del otro”. En este artículo se busca, mediante la perspectiva de la energética social, rastrear dicha base material de la alteridad.

  7. Planificación energética para el ahorro de fueloil en una lavandería industrial

    OpenAIRE

    Madrigal, José A.; Cabello Eras, Juan J.; Hernández Herrera, Hernán; Sousa Santos, Vladimir; Balbis Morejón, Milén

    2018-01-01

    RESUMEN En el presente trabajo se diseña y aplica un procedimiento de planificación energética, compatible con la norma ISO 50001, a una lavandería industrial. Se analizan tres variables de entrada: nivel de producción, estado técnico del sistema y régimen de operación. Se examina el pasado, presente y futuro del consumo del fuel oíl en el sistema de generación y uso del vapor, estableciendo las causas del deterioro del indicador de consumo. A través de un estudio de carga y capacidad en el s...

  8. Estrategias pasivas de optimización energética de la vivienda social en clima mediterráneo

    Directory of Open Access Journals (Sweden)

    Suárez, R.

    2016-03-01

    Full Text Available The main goals of Horizon 2020 have led to the updating of the Basic Document on Energy Saving of the Technical Building Code in 2013. The demands of the new model, based on technological and construction parameters, are associated with a more extensive assessment of the architectural conditions of buildings. This study aims to analyse the repercussion of the new regulations on Mediterranean social housing in climate zone B4. It proposes energy analysis on a basic model of a single linear block, adding different individual passive strategies relating to compactness, envelope material, solar control, solar accumulation and ventilation, analysing the improvement in energy demand, energy rating and indoor comfort. The main energy improvement actions used take into account orientation as well as the combined improvement in energy performance of the thermal envelope, ventilation rate and suitable solar protection. These lead to major reductions in energy demand and CO2 emissions while improving indoor comfort conditions.Los objetivos prioritarios del Horizonte 2020 han llevado a la actualización del Documento Básico de Ahorro de la Energía del CTE en 2013, introduciendo un nuevo modelo en las exigencias, basado en parámetros tecnológicos y constructivos, asociado a una mayor valoración de las condiciones arquitectónicas del edificio. Este trabajo pretende analizar la repercusión del nuevo marco normativo en la vivienda social del área mediterránea, en la zona climática B4. Se plantea el análisis energético en un modelo base de bloque lineal entre medianeras al que se incorporan individualmente, distintas estrategias pasivas asociadas a la compacidad, materialidad de la envolvente, control solar, acumulación solar y ventilación, analizando la mejora de la demanda de energía, la calificación energética y el confort interior. La consideración de la orientación, junto con la combinación de la mejora de las prestaciones energ

  9. Análisis beneficio-costo y cuantificación de la energía invertida en sistemas de caficultura campesina en Puriscal, Costa Rica

    Directory of Open Access Journals (Sweden)

    Jairo Mora-Delgado

    2006-01-01

    Full Text Available Tres modelos de sistemas de producción de caficultura campesina en el Cantón de Puriscal, Costa Rica, fueron estudiados para determinar la relación beneficio-costo y estimar la energía invertida por producto obtenido. Los 3 modelos hipotéticos fueron el resultado del agrupamiento de 39 fincas, realizado mediante un análisis de conglomerados (cluster analysis, del cual resultaron 3 grupos. El primero fue denominado fincas de tecnología orgánica (TO, caracterizadas por utilizar recursos endógenos en su sistema de producción, principalmente tecnologías orgánicas. El segundo se caracterizó por ser fincas convencionales, donde se distinguieron 2 subgrupos: fincas de tecnología mixta (TM y fincas de tecnología convencional (TC. Las segundas usan tecnologías y recursos convencionales; las primeras funcionan bajo un esquema de caficultura convencional, pero han incorporado algunas prácticas y recursos de la agricultura orgánica. Se realizó un análisis beneficio-costo en 3 modelos hipotéticos, que representan a cada uno de los grupos de fincas definidos. Mediante el método de procesos, para evaluar la productividad de la energía, se estimó la cantidad de energía invertida en insumos y mano de obra en los 3 modelos; para ello se empleó factores de conversión reportados en diferentes estudios, y dichos valores fueron convertidos a valores de energía. Los beneficios financieros más altos, en el corto plazo, se obtuvieron en el modelo TC, comparado con los sistemas TO y TM. Sin embargo, desde el punto de vista de la productividad de la energía, el modelo de caficultura orgánica es el que presenta una mayor eficiencia energética, en la medida en que para producir 1 kg de café en cereza se invirtió 0,51 MJ kg-1, que es 50% de la energía requerida para producir el mismo kg en los modelos TC (1,06 MJ kg-1 y TM (0,97 MJ kg-1.

  10. Avances en la evaluación de la eficiencia energética del proceso de producción de biodiesel para distintas escalas

    Directory of Open Access Journals (Sweden)

    DONATO L

    2012-04-01

    Full Text Available ResumenEl biodiesel es un biocombustible producido por la reacción entre aceite vegetal o grasa animal y alcohol.El balance energético es uno de los puntos críticos al momento de evaluar la sustentabilidad del mismo. El objetivo de este trabajo es analizar la relación entre la energía consumida y generada en dos sistemas de producción de biodiesel: uno para autoconsumo en un establecimiento agropecuario y otro para abastecer el corte interno de gasoil y las exportaciones. Con datos de la etapa agrícola e industrial y mediante la aplicación de indicadores energéticos, se obtuvieron los resultados para cada caso. En el sistema de producción para autoconsumo, la colza y el girasol se presentan como las mejores alternativas desde el punto de vista energético. En el caso de la producción para el corte interno y exportación, el mejor resultado se produce con soja de siembra directa y tecnología de punta. Se necesitan conocer el consumo de energía fósil para la fabricación de los principales insumos (fertilizantes, agroquímicos y alcohol para obtener un análisis con mayor certeza del balance energético en nuestro país.biocombustibles; balance energético.AbstractBiodiesel is a biofuel produced by the reaction between vegetable oil or animal fat and alcohol. The energy balance is a critical point when assessing the sustainability. The aim of this study is to analyze the relationship between energy consumed and generated in two biodiesel production systems: one for consumption on a farm and other to supply the diesel blended and export. Using data from the agricultural and industrial stage by application of energy indicators, results were obtained for each case. In the system of production for own consumption, rapeseed and sunflower are presented as the best alternative from an energy standpoint. In production for domestic and export cut, soybean tillage system with advanced technology provides the best results of energy balance. In

  11. Estimativa das necessidades energéticas em pacientes com doença renal crônica Estimating the energy requirement of chronic kidney disease patients

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    Juliana Cordeiro Dias Rodrigues

    2013-02-01

    Full Text Available Estabelecer as necessidades energéticas de pacientes com doença renal crônica é importante para que se possam tratar os distúrbios nutricionais encontrados nessa população. Segundo os guias de condutas voltados ao cuidado nutricional de pacientes com essa doença, a recomendação energética pode variar entre 30 e 40kcal/kg/dia. Contudo, trabalhos que avaliaram os componentes do gasto energético nos pacientes com doença renal crônica sugerem que as necessidades energéticas dessa população podem diferir do valor recomendado acima, a depender da condição clínica (presença de comorbidades, da modalidade de tratamento empregado e do nível de atividade física. Dessa forma, o presente trabalho tem como objetivo fazer uma revisão dos estudos sobre o gasto energético de pacientes com doença renal crônica, com o intuito de abordar as seguintes questões: (1 as atuais recomendações de energia para pacientes com doença renal crônica estão adequadas? (2 qual equação de predição poderia ser empregada para estimar as necessidades energéticas desse grupo de pacientes? Assim, esta revisão busca auxiliar o nutricionista ao estimar as necessidades energéticas de pacientes com doença renal crônica.Estimating the energy requirement of patients with chronic kidney disease is highly important for treating the nutritional disorders often seen in this population. According to the specific guidelines for patients with chronic kidney disease, the currently recommended daily energy intake varies from 30 to 40kcal/kg/day. However, studies that investigated energy expenditure components of patients with chronic kidney disease suggested that the energy requirement may differ from the one proposed earlier, depending on overall clinical condition (i.e. presence of comorbidities, treatment modality and level of physical activity. With this perspective in mind, the present study aims to review the studies assessing energy expenditure

  12. Medium-Energy Particle experiments (MEPs) for the Exploration of energization and Radiation in Geospace (ERG) mission

    Science.gov (United States)

    Kasahara, S.; Yokota, S.; Mitani, T.; Asamura, K.; Hirahara, M.; Shibano, Y.; Yamamoto, K.; Takashima, T.

    2017-12-01

    ERG (Exploration of energization and Radiation in Geospace) is the geospace exploration spacecraft, which was launched on 20 December 2016. The mission goal is to unveil the physics behind the drastic radiation belt variability during space storms. One of key observations is the measurement of ions and electrons in the medium-energy range (10-200 keV), since these particles excite EMIC, magnetosonic, and whistler waves, which are theoretically suggested to play significant roles in the relativistic electron acceleration and loss. Medium-Energy Particle experiments - electron analyser (MEP-e) measures the energy and the direction of each incoming electron in the range of 7 to 87 keV. The sensor covers 2π radian disk-like field-of-view with 16 detectors, and the solid angle coverage is achieved by using spacecraft spin motion. The electron energy is independently measured by an electrostatic analyser and avalanche photodiodes, enabling the significant background reduction. Medium-Energy Particle experiments - ion mass analyzer (MEP-i) measures the energy, mass, and charge state of the direction of each incoming ion in the medium-energy range (180 keV/q). MEP-i thus provides the velocity distribution functions of medium-energy ions (e.g., protons and oxygens), from which we can obtain significant information on local ion energization and pitch angle scattering in the inner magnetosphere. Heavy ion measurements can also play an important role to restrict global mass transport including the ionosphere and the plasmasheet. Here we show the technical approaches, data output, and highlights of initial observations.

  13. As paisagens da transição energética: uma perspectiva política

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    Marie-José Fortin

    2015-11-01

    Full Text Available Além de grandes objetivos genéricos, a transição energética necessita ser traduzida em políticas e em projetos bastante concretos. A implementação destes últimos, frequentemente na forma de amplos sítios de produção de energia, provoca fortes reações nos territórios, entre outros, em nome da paisagem. Entretanto, ao invés de reconhecer nesse fato uma reação sistemática de oposição, sugere-se considerar a paisagem enquanto uma forma de testar o nível de territorialização das propostas realizadas em nome da transição energética: na qualidade de arcabouço cognitivo e político, a paisagem permitiria, deste modo, confrontar “projeto” e “território”, e compreender se o primeiro demonstra-se coerente e representativo em relação ao futuro do segundo. Nesse sentido, propõe-se um roteiro de análise estruturado em três níveis, referindo-se a abordagens teóricas complementares, quais sejam: a paisagem 1 como representação social, 2 como instrumento e objeto negociado e 3 como paradigma societal. O recente desenvolvimento da matriz eólica no Québec ilustra como a “paisagem” poderia ser mobilizada nesse sentido.

  14. Diferentes niveles de energía metabolizable y aminoácidos azufrados en dietas para gallinas Bovans blancas

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    María de los Ángeles Tepox Pérez

    2012-01-01

    Full Text Available Con el objeto de evaluar el comportamiento productivo de la gallina Bovans blanca de primer ciclo alimentadas con dietas con niveles diferentes de energía metabolizable (EM y de metionina+cistina digestible (AAD, para lograr disminuir el porcentaje de huevo pequeño (<42 g, al inicio de la producción se utilizaron 384 gallinas de 19 semanas de edad. Se usó un diseño completamente al azar, en un arreglo factorial de 4 X 2, donde el primer factor fueron los niveles de EM (2700, 2800, 2900, 3000 Kcal/kg y el segundo factor fue la inclusión de diferentes porcentajes de AAD (0.45, 0.61. Cada tratamiento, contó con cuatro repeticiones de 12 gallinas cada uno. Durante ocho semanas se llevaron registros semanales, del porcentaje de postura, peso promedio del huevo, consumo de alimento; masa de huevo/ave/día y conversión alimenticia; además, se clasificó el huevo de acuerdo al peso. Los resultados obtenidos, no mostraron respuesta a los factores de estudio ni a la interacción entre nivel de EM y AAD, para ninguna de las variables productivas. Se encontró un efecto sobre el consumo de alimento del nivel de energía y aminoácidos azufrados (P<0.05. Se disminuyó el porcentaje de huevo pequeño en los niveles más altos de EM de 2900 y 3000 Kcal/Kg (29.6 y 30.4 % respectivamente. Se incrementó (P<0.05 el porcentaje de huevo grande en 3 % al usar dietas con el nivel de AAD de 0.61 %.

  15. Substrate modulation of fatty acid effects on energization and respiration of kidney proximal tubules during hypoxia/reoxygenation.

    Directory of Open Access Journals (Sweden)

    Anja Bienholz

    Full Text Available Kidney proximal tubules subjected to hypoxia/reoxygenation develop a nonesterified fatty acid-induced energetic deficit characterized by persistent partial mitochondrial deenergization that can be prevented and reversed by citric acid cycle substrates. To further assess the role of competition between fatty acids and substrates on inner membrane substrate carriers in the deenergization and the contribution to deenergization of fatty acid effects on respiratory function, digitonin-permeabilized rabbit and mouse tubules were studied using either addition of exogenous oleate after control normoxic incubation or increases of endogenous fatty acids produced by hypoxia/reoxygenation. The results demonstrated major effects of matrix oxaloacetate accumulation on succinate-supported energization and respiration and their modification by fatty acids. Improvements of energization in the presence of fatty acids by glutamate were shown to result predominantly from lowering matrix oxaloacetate rather than from amelioration of transmembrane cycling of fatty acids and uncoupling. Mouse tubules had 2.5 fold higher rates of succinate utilization, which resulted in stronger effects of oxaloacetate accumulation than rabbit tubules. Hypoxia/reoxygenation induced respiratory inhibition that was more severe for complex I-dependent substrates. Fatty acids themselves did not acutely contribute to this respiratory inhibition, but lowering them during 60 min. reoxygenation to allow recovery of ATP during that period alleviated it. These data clarify the basis for the nonesterified fatty acid-induced mitochondrial energetic deficit in kidney proximal tubules that impairs structural and functional recovery and provide insight into interactions that need to be considered in the design of substrate-based interventions to improve mitochondrial function.

  16. Un modelo dinámico bayesiano para pronóstico de energía diaria

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    Marisol Valencia Cárdenas

    2013-07-01

    Full Text Available Los modelos dinámicos bayesianos son una alternativa útil para elaborar pronósticos con pocos datos históricos, o que ayudan a complementar la poca información que se tenga. En este trabajo se propone el diseño de un algoritmo para realizar pronósticos usando un modelo dinámico bayesiano basado en Filtro de Kalman. Se ilustra el procedimiento aplicándolo al pronóstico de demanda de energía diaria de Colombia, lo cual puede ser útil en sistemas que presenten fallas, o en regiones donde apenas inicia el abastecimiento energético. La eficiencia se determina con el indicador de error absoluto medio (MAPE de ajuste y de pronóstico; este último resulta menor del 3%, valor adecuado para mostrar validez del método propuesto. Dynamic Bayesian Models are a useful alternative to make forecasts with few historical data, or that permits to complement the little information you have.  In this paper we propose an algorithm design to forecast using a dynamic Bayesian model based on Kalman Filter. We illustrate the procedure by applying it to the prediction of daily energy demand of Colombia, which can be useful in systems experiencing failures, or in regions where energy supply is just beginning. The efficiency is determined by the Average Absolute Error Indicator (MAPE, of adjustment and forecast; the last one is less than 3%, appropriate value to show validity of the proposed method.

  17. Síntesis de nitruro de titanio mediante láser y energía solar concentrada

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    García, I.

    1998-04-01

    Full Text Available The possibility of the employment of solar energy concentrated by Fresnel lens is investigated in order to synthesize materials by gas-solid reaction. These first results are compared by two similar techniques as high power laser and xenon are lamp. The TiN coatings obtained with xenon are lamp and Fresnel lens are homogenous, without pores or defects, with a uniform thickness of about 6 μm for treatments of 2 min. The good quality of the TiN coating for all the testing conditions was confirmed by the x-ray diffraction measurements.

    Se presenta la utilización de la energía solar concentrada mediante lentes de Fresnel para la síntesis de materiales por reacción gas-sólido. Estos primeros resultados sobre nitruración superficial de titanio y aleaciones de titanio se comparan con los obtenidos con técnicas similares como el láser de alta potencia y la lámpara de descarga de xenón. Las capas de nitruro de titanio obtenidas mediante energía solar concentrada por lentes de Fresnel y lámpara de xenón son homogéneas, sin grietas ni defectos, y con un espesor uniforme de 6 μm en tiempos de sólo 2 min. La buena calidad de estas capas se confirma mediante difracción de rayos X.

  18. On the Peculiar Molecular Shape and Size Dependence of the Dynamics of Fluids confined in a Small-Pore Metal-Organic Framework

    KAUST Repository

    Skarmoutsos, Ioannis

    2018-05-15

    Force field based-Molecular dynamics simulations were deployed to systematically explore the dynamics of confined molecules of different shapes and sizes, i.e. linear (CO2 and N2) and spherical (CH4) fluids, in a model small pore system, i.e. the Metal-Organic Framework SIFSIX-2-Cu-i. These computations unveil an unprecedented molecular symmetry dependence of the translational and rotational dynamics of fluids confined in channel-like nanoporous materials. In particular this peculiar behaviour is reflected by the extremely slow decay of the Legendre reorientational correlation functions of even-parity order for the linear fluids which is associated to jump-like orientation flips, while the spherical fluid shows a very fast decay taking place in a sub-picosecond time scale. Such a fundamental understanding is relevant to diverse disciplines such as in chemistry, physics, biology and materials science where diatomic or polyatomic molecules of different shapes/sizes diffuse through nanopores.

  19. Productividad y eficiencia de uso de nitrógeno y energía en pollos de engorda alimentados con pasta de soya o pasta de canola

    Directory of Open Access Journals (Sweden)

    Sergio Gómez Rosales

    2012-01-01

    Full Text Available Se realizaron dos experimentos de sacrificio para evaluar el crecimiento, contenido y deposición de tejidos y retención de proteína y energía en la carne de la canal en pollos en crecimiento alimentados con pasta de canola (PCAN en sustitución de pasta de soya (PSOY. En el Exp 1, seis pollos machos, de 43 días de edad, se sacrificaron al inicio y 36 pollos fueron asignados a tres dietas con cantidades crecientes de PCAN (0, 10 y 20 % combinadas con dos niveles de lisina digestible (LD: 0.85 y 0.95 %. En el Exp 2, seis hembras y seis machos, de 28 días de edad, se sacrificaron al inicio y 72 pollos fueron asignados, por sexo, a dos dietas (PSOY o PCAN como único ingrediente proteico combinadas con tres niveles de energía (3.0, 3.1 y 3.2 Mcal de EM/kg de alimento. Cada experimento duró dos semanas y al final todos los pollos fueron sacrificados. En el Exp 1, no hubo diferencias estadísticas en la productividad o retención de proteína y energía en la canal entre niveles de PCAN (P>0.05. En el Exp 2, el consumo de alimento, proteína y energía y la deposición de grasa fueron mayores (P<0.05 con PSOY, pero la ganancia de peso, eficiencia alimenticia y retención de proteína y energía en la canal fueron similares entre dietas. Los resultados indican que es factible sustituir parcial o totalmente la pasta de soya por pasta de canola en la dieta de pollos de engorda en crecimiento.

  20. Inclusão do equivalente energético do lactato na regressão VO2-intensidade em corrida horizontal e inclinada (10,5%

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    Victor Machado REIS

    Full Text Available Resumo O estudo teve por objetivo analisar o efeito da adição do equivalente energético do lactato sanguíneo com a medida de VO2 durante a corrida em esteira horizontal (0% e inclinada (10,5%, como forma de estimativa do custo energético da corrida. Treze corredores de meia e longa distância (idade 28,1 ± 4,2 anos; estatura 1,75 ± 0,07 m; massa corporal 65,2 ± 4,9 kg; VO2max 70,3 ± 4,9 ml·kg-1·min-1 cumpriram dois testes em esteira rolante (0% e 10,5% que incluíram vários estágios em intensidade constante. Foram calculadas para cada atleta as regressões VO2-velocidade, bem como regressões alternativas com a adição de um equivalente energético de 3 ml O2 Eq·kg-1·mM [La-] às medições de VO2. Não se verificou interação significativa entre a adição do equivalente do lactato e a inclinação da esteira. A ANOVA indicou um efeito significativo da adição do equivalente do lactato na inclinação da reta de regressão e na estimativa do custo energético. Os tamanhos do efeito obtidos indicam que este efeito é mais forte na corrida horizontal. Estes resultados sugerem que em testes laboratoriais com corredores treinados se deverá considerar a adição dos valores de VO2 com os equivalentes energéticos do lactato.