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Browsing Conference papers by Title

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  • On the Energy Efficiency in Multi-user Multi-relay Coded Network 
    Qi, Nan; Xiao, Ming; Tsiftsis, Theodoros A.; Cao, Phuong L.; Skoglund, Mikael; Li, Lixin (2016)
    In this paper, the energy efficiency (EE) of a cooperative diversity system with maximum diversity network coding (MDNC) is studied. In the considered system, channel state information (CSI) is only available at the ...
  • Oscillatory momentum transport in cascade transitional boundary layer flows 
    Rojas-Solorzano, L. (DOI: 10.2514/6.1998-2560 Conference: 29th AIAA Fluid Dynamics Conference, At Albuquerque, NM, USA, Volume: 1, 1998)
    The generation and early evolution of boundary layer transitional instabilities, named Tollmien-Schlichting (T-S) waves, in airfoil cascade flows are studied. The energy exchange between the mean flow and the flow instabilities ...
  • Pre-feasibility study for PV electrfication of off-grid rural communities 
    Akiki, Georgio; Hinrichs, Federico; Zuylen, Roderick A.; Rojas-Solorzano, L. (International Renewable Energy Congress November 5-7, 2010 – Sousse, Tunisia, 2010-11-05)
    A pre-feasibility study has been undertaken for the electrification of the rural off-grid village of Hurhudedanda, Nepal. PV solar was deemed most suitable after an assessment of local wind, micro-hydro, solar and biogas ...
  • Pre-feasibility study of a biogas plant for peyrelevade community 
    Koh, Pei Ling; Pomarico, Victor; Tadepalli, Venkata Phani; Rojas-Solorzano, L. (International Renewable Energy Congress November 5-7, 2010 – Sousse, Tunisia, 2010-11-05)
    This work presents a technical and financial pre-feasibility assessment for heat generation from biogas for a retirement home in the community of Peyrelevade, France. The heat demand of the retirement home currently relies ...
  • Red Sea Rifting Controls on Groundwater Reservoir Distribution: Constraints from Geophysical, Isotopic, and Remote Sensing Data 
    Sturchio, Neil C.; Sagin, Jay; Becker, Richard H.; Ahmed, Mohamed (2008-10)
    Highly productive wells in the Central Eastern Desert of Egypt are tapping groundwater in subsided blocks of Jurassic to Cretaceous sandstone (Taref Formation of the Nubian Sandstone Group) and Oligocene to Miocene ...
  • Resource Allocation for Licensed/Unlicensed Carrier Aggregation MIMO Systems 
    Tsinos, Christos G.; Foukalas, Fotis; Tsiftsis, Theodoros A. (2016)
    In this paper a novel Carrier Aggregation (CA) scheme is proposed for downlink MIMO LTE-A Systems. The proposed approach achieves increased transmission rates by establishing the communication links via both licensed ...
  • Run Life Enlargement Methodology for Ball-and-Seat Check Valves Used in Artificial Lift Pumping Units 
    Zarea, S.; Rojas-Solorzano, L.; Kabboul, F. (SPE Latin American and Caribbean Petroleum Engineering Conference, Caracas, Venezuela, 21–23 April 1999, 1999-04-21)
    Experiments are performed to evaluate the leakage vs. pressure drop, wear and fluid properties, in ball-and-seat valves used in pumping units for artificial oil production. The test facility is constructed to evaluate the ...
  • Selection and validation of a turbulence model for the numerical simulation of the flow at hemodialysis cannulas 
    Salazar, Félix A.; Rojas-Solorzano, L. (III INTERNATIONAL CONGRESS ON COMPUTATIONAL BIOENGINEERING M. Cerrolaza, H. Rodrigues, M. Doublaré, J. Ambrosio, M. Viceconti (Eds.) Isla de Margarita, Venezuela, September 24 to 26, 2007, 2007-09-24)
    In recent years, CFD has become an increasingly used tool in the design of blood-based devices. Particularly, the estimation of red blood cell damage (hemolysis) becomes an important challenge to CFD scientists since the ...
  • Simulation of the Velocity field in compound channel flow using different closure models 
    Filonovich, M.; Azevedo, R.; Rojas-Solorzano, L.; Leal, J. B. (2010)
    In this study a comparison of three turbulence closure models (two isotropic and one anisotropic) with experimental data is performed. The interaction between the main channel (MC) flow and the floodplain (FP) generates a ...
  • Simultaneous Spectrum Sensing and Data Transmission for Multi-User MIMO Cognitive Radio Systems 
    Miridakis, Nikolaos I.; Tsiftsis, Theodoros A.; Alexandropoulos, George C.; Debbah, M´erouane (2016)
    We present a multi-user multiple-input multipleoutput (MIMO) cognitive radio system consisting of a secondary receiver that deploys spatial multiplexing to decode signals from multiple secondary transmitters, under the ...
  • Study of the transient temperature profiles induced by changes of the welding parameters during aluminium two plate arc butt-welding 
    Urthaler, Yetzirah; Viggiani, Pedro; Payares, Carolina; Rojas-Solorzano, L. (Universidad Simón Bolívar Departamento de Mecánica (*) Departamento de Conversión de Energía, 2001)
    The numerical study and calculation of transient temperatures developing during the arc-welding process of 6063 T5 aluminum plates is presented. The mathematical model is based on the differential energy conservation ...
  • Teaching how to use the CFD Approach by an Example: Hydrodynamics within a Passenger Car Compartment in Motion 
    Rojas-Solorzano, L.; García, Nelson; Polanco, Geanette (DOI: 10.1115/FEDSM2009-78014 Conference: ASME 2009 Fluids Engineering Division Summer Meeting, At Vail, Colorado USA, Volume: 1, 2009-08-02)
    The CDF methodology is applied to the study of the air flow around a 2-D car and its interaction with the cabin internal air. The flow visualization or computational works enable engineers to calculate different car ...
  • Technical and economical prefeasibility study of a solar water heating (SWH) system in an apartment building in Cape Town 
    Idowu, Olugbeminiyi; Ige, Toluwalope; Legenski, Nicole; Mustafa, Amin A.; Rojas-Solorzano, L. (7th International Exergy, Energy and Environment Symposium, Valenciennes, France; 04/2015, 2015-04)
    Solar power has significant potential to reduce reliance on conventional energy sources in South Africa. A prefeasibility study for a communal solar water heating system (SWHS) is performed for an apartment building in the ...
  • Technical and economic prefeasibility analysis of residential solar PV system in South Kazakhstan 
    Assamidanov, Anuar; Nogerbek, Nurbol; Rojas-Solorzano, L. (7th International Exergy, Energy and Environment Symposium, 2015-04)
    In the family of the renewable technologies, photovoltaic (PV) systems today attract considerable attention (Dornfeldt, 2013). However, on-grid PV market is not a profitable sector by itself. It is dependent on the ...
  • Technical and economic prefeasibility study of mini-hydro power plants in Venezuela. Case study: El Valle River 
    Trejo, Victor; Diaz, Gabriela; Rojas-Solorzano, L. (7th International Exergy, Energy and Environment Symposium, 2015-04)
    The technical and economic feasibility of the installation of a mini-hydroelectric power plant on El Valle River in Venezuela is assessed. Special attention is paid to modeling Venezuela’s energetic and economic scenarios. ...
  • Technical-Economic Assessment of Energy Efficiency Measures in a Mid-Size Industry 
    Benavides, Sara; Bitosova, Maria; Gregorio, Javier; Welschbilling, Aubin; Rojas-Solorzano, L. (7th International Exergy, Energy and Environment Symposium, 2015-04)
    The industry sector is facing many challenges such as global competition, energy pricing, environmental impact amongst others. Consequently, the necessity of energy efficiency measures has become evident; framing the ...
  • Technical-Economic Prefeasibility Assessment of an off-grid Mini-Hydro Power Plant for an Agribusiness Resort in Kaduna Nigeria 
    Adamu, Victor; Ampofo, Nana; Pramono Jati, Ario Panggi; Tulabing, Ryan; Rojas-Solorzano, L. (7th International Exergy, Energy and Environment Symposium, 2015-04)
    Clean energy technologies are beginning to receive attention in Nigeria to offset the increasing greenhouse gas emissions. These emissions are associated to the wide use of small-scale fossil-fuel-powered generators by ...
  • Thermal modelling of a lithium-Ion aqueous battery 
    Adair, Desmond; Kalimuldina, Gulnur; Bakenov, Zhumabay (The Electrochemical Society, 2013-10)
    Thermal modelling is presented here for a novel lithium-ion aqueous battery [1] using the commercial multi-physics package COMSOL with extensions consisting of an energy balance and temperature dependence of properties ...
  • Torsional current - meter for channels 
    Zarea, Stefan; Rojas-Solorzano, L. (1997 ASME Fluids Engineering Division Summer Meeting, June 22-26, 1997-06-22)
    The main objective of this paper is to present the results of the experimental investigation of a Zarea-type torsional velocity-meter. For this, a torsional meter was designed, built and tested in the laboratory. The current ...
  • Transient Two-Phase-Flow Model for Predicting Column Formation in Intermittent Gas Lift Systems 
    Sandoval, Sarita; Rojas-Solorzano, L.; Gasbarri, Sandro (SPE Latin American and Caribbean Petroleum Engineering Conference, Rio de Janeiro, Brazil, 20 – 23 June 2005, 2005-06-20)
    The major objective of this work is to generate a mathematical model, allowing the prediction of mixture density, liquid holdup, the pressure gradient in the pipe and the real column size. This is useful for optimizing ...