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Search Results: 1 - 10 of 119 matches for " Viatcheslav Kafarov "
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MICROALGAE BASED BIOREFINERY: ISSUES TO CONSIDER
ángel-Darío González-Delgado,Viatcheslav Kafarov
CT&F - Ciencia, Tecnología y Futuro , 2011,
Abstract: Biorefining is sustainable biomass processing to obtain energy, biofuels and high value products through processes and equipment for biomass transformation. The biorefinery concept has been identified as the most promising way to create a biomass-based industry. Microalgae are classified as promising candidates in biorefinery processes because they are particularly important for obtaining multiple products. This review article describes the biorefinery concept taking into account its different interpretations and comparing it with the traditional biomass transformation processes. It describes the general characteristics of microalgae, and their potential to be used as a raw material in the biorefinery process. The review focuses on the state of the art of products obtained from microalgae for the biofuel industry, mainly for biodiesel production, and the different methods to extract oil for biodiesel production as well as other products. Based on this information, several aspects are suggested to be taken into account for the development of a topology for a microalgae-based biorefinery. Biorefinar es procesar biomasa de forma sostenible para obtener biocombustibles, productos comercializables y energía mediante procesos y equipos para la transformación de biomasa. El concepto de biorefinería ha sido identificado como el camino más prometedor para la creación de una industria basada en la biomasa. Las microalgas se catalogan como candidatas promisorias en procesos de biorefinería, siendo particularmente importantes por la obtención de múltiples productos. Este artículo de revisión, describe el concepto de biorefinería teniendo en cuenta sus diferentes interpretaciones y se compara con los procesos tradicionales de transformación de biomasa, se describen las características generales de las microalgas, y su potencial para ser utilizadas como materia prima en procesos de biorefinería, la revisión se enfoca en el estado del arte de los productos obtenidos de microalgas de interés para la industria de los biocombustibles y los diferentes métodos de extracción tanto de aceite para la producción de biodiesel como de otros productos y con base en esta información, se sugieren algunos aspectos a tener en cuenta para el desarrollo de una topología de biorefinería basada en microalgas. Biorefinar é processar biomassa de forma sustentável para obter biocombustíveis, produtos comercializáveis e energia mediante processos e equipamentos para a transforma o de biomassa. O conceito de biorefinaria tem sido identificado como o caminho mais prometedor para a cria o de u
Process Integration of Bioethanol from Sugar Cane and Hydrogen Production
L. Hernandez,V. Kafarov
Journal of Applied Sciences , 2007,
Abstract: In this study several alternatives for process integration of bioethanol from sugar cane and hydrogen production were evaluated. Bioethanol was produced above all in the fermentation of sweetened juice from sugar cane, stillage was removed. Stillage and bagasse are the process byproducts. The bioethanol steam reforming is an endothermic catalytic process when vaporized ethanol and steam are fed using a 1:6 molar ratio to reformer with a Ni-catalyst at atmospheric pressure and 350xC. Taking into account the processes properties mentioned above, it is possible to integrate the bioethanol production from sugar cane and its reforming by using byproducts like bagasse and stillage and to produce energy for steam reforming and bioethanol solution concentration by direct firing (for bagasse) or anaerobic digestion to get methane (for stillage).
Experimental status of top charge asymmetry measurements
Viatcheslav Sharyy
Physics , 2013,
Abstract: The latest measurements of the asymmetry in the angular distributions of the $t\bar{t}$ events are reviewed. The measurements of the forward-backward asymmetry $A_{FB}$ in the $p\bar{p}$ 1.98 TeV collision at the Tevatron show some tension with the standard model calculation, while results of the measurements of the charge asymmetry $A_C$ in $pp$ collisions at 7 TeV and 8 TeV at the LHC are compatible with standard model prediction.
Quantum Cosmological Perturbations: Predictions and Observations
Viatcheslav Mukhanov
Physics , 2013, DOI: 10.1140/epjc/s10052-013-2486-7
Abstract: I consider the generic model independent predictions of the theory of quantum cosmological perturbations. To describe the stage of cosmic inflation, where these perturbations are amplified, the hydrodynamical approch is used. The inflationary stage is completely characterized by the deviation of the equation of state from cosmological constant which is a smooth function of the number of e-folds until the end of inflation. It is shown that in this case the spectral index should deviate from the flat one at least by 3 percent irrespective of any particular scenario. Given the value of the spectral index the lower bound on the amount of the gravitational waves produced is derived. Finally the relation between effective hydrodynamical description of inflation and inflationary scenarios is discussed.
Modelagem numérica do efeito sismoelétrico em meios 2D
Vanzeler, Francisco;Priimenko, Viatcheslav;
Revista Brasileira de Geofísica , 2009, DOI: 10.1590/S0102-261X2009000100006
Abstract: this work uses the equations of the coupled poroelastic-electromagnetic phenomena to simulate by finite-difference methods the seismoelectric responses of 2d saturated porous models. the seismic source was of explosive type with frequencies in a seismic range up to 100 hz. the receivers were arranged in horizontal and vertical positions. several heterogeneous porous models were simulated to define the interface type enabling the generation of seismoelectric signals, the minimum dimension of heterogeneity that is possible to detect and the maximum investigation range of seismoelectric tools. the seismoelectric response was observed at interface of porosity, salinity, lithology and oil-water contact. these results provided a quantitative base for planning of seismoelectric acquisition jointly with surface seismic, well and interwell seismic tools for targets inside of the investigation range.
Mathematical problems of electromagnetoelastic interactions
Viatcheslav Priimenko,Mikhail Vishnevskii
Boletim da Sociedade Paranaense de Matemática , 2007,
Abstract: There are studied nonlinear mathematical problems of the interactionof electromagnetic fields with deformable media. The models are based on combination of the Lam and Maxwell systems coupled through so-called seismomagnetic effect. Several direct and associated with them inverse problems are studied. Then speaking about the inverse problems, electromagnetic and elastic characteristics of a medium are the subject of reconstruction. The values of physical fields are connected through electromagnetoelastic interactions. We consider the processes which are observed when elastic waves propagate in an elastic electroconducting medium. Variations of the seismic and electromagnetic fields in this case are called electro-magnetoelastic waves. There are described di erent statements of mathematical model of the electromagnetoelastic interactions. Then the theoretical results of the analytical solution are discussed for various nonlinear direct and inverse problems for the equations of electromagnetoelasticity.
Self pinning protein-laden drops
Viatcheslav V. Berejnov
Physics , 2008,
Abstract: Proteins dissolved in a drop induce and enhance the pinning of the drop contact line. This effect dramatically increases volume of drops that are vertically pinned on a flat siliconized substrate. The drop pinning behavior exhibits two regimes: for low protein content in a drop the pinning increases as the contact angle hysteresis increases, and for high protein content the pinning decreases as the surface tension of the protein solution decreases.
Geometrical phase driven predissociation: Lifetimes of 2^2 A' levels of H_3
Juan Blandon,Viatcheslav Kokoouline
Physics , 2009, DOI: 10.1103/PhysRevLett.102.143002
Abstract: We discuss the role of the geometrical phase in predissociation dynamics of vibrational states near a conical intersection of two electronic potential surfaces of a D_{3h} molecule. For quantitative description of the predissociation driven by the coupling near a conical intersection, we developed a method for calculating lifetimes and positions of vibrational predissociated states (Feshbach resonances) for X_3 molecule. The method takes into account the two coupled three-body potential energy surfaces, which are degenerate at the intersection. As an example, we apply the method to obtain lifetimes and positions of resonances of predissociated vibrational levels of the 2^2 A' electronic state of the H_3 molecule. The three-body recombination rate coefficient for the H+H+H -> H_2+H process is estimated.
On Quantum Integrable Systems
Viatcheslav Danilov,Sergei Nagaitsev
Physics , 2011,
Abstract: Many quantum integrable systems are obtained using an accelerator physics technique known as Ermakov (or normalized variables) transformation. This technique was used to create classical nonlinear integrable lattices for accelerators and nonlinear integrable plasma traps. Now, all classical results are carried over to a nonrelativistic quantum case.
Vibrational states of the triplet electronic state of H3+. The role of non-adiabatic coupling and geometrical phase
Alexander Alijah,Viatcheslav Kokoouline
Physics , 2015,
Abstract: Vibrational energies and wave functions of the triplet state of the H3+ ion have been determined. In the calculations, the ground and first excited triplet electronic states are included as well as the non-Born-Oppenheimer coupling between them. A diabatization procedure transforming the two adiabatic ab initio potential energy surfaces of the triplet-H3+ state into a 2x2 matrix is employed. The diabatization takes into account the non-Born-Oppenheimer coupling and the effect of the geometrical phase due to the conical intersection between the two adiabatic potential surfaces. The results are compared to the calculation involving only the lowest adiabatic potential energy surface of the triplet-H3+ ion and neglecting the geometrical phase. The energy difference between results with and without the non-adiabatic coupling and the geometrical phase is about a wave number for the lowest vibrational levels.
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