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Search Results: 1 - 10 of 402442 matches for " Romeo M. Marian "
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Modeling and Optimisation of Distribution Networks Using Hybrid Genetic Algorithms: A Comparative Study
Romeo M. Marian,Lee H.S. Luong,Son Duy Dao
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Modeling and Optimization of Precedence-Constrained Production Sequencing and Scheduling Using Multi-Objective Genetic Algorithms
Son Duy DAO,Romeo MARIAN
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Optimisation of Precedence-constrained Production Sequencing and Scheduling Using Genetic Algorithms
Son Duy DAO,Romeo MARIAN
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Optimal Control Development System for Electrical Drives
Marian GAICEANU,Emil ROSU,Romeo PADURARU,Cristinel DACHE
Annals of Dunarea de Jos , 2008,
Abstract: In this paper the optimal electrical drive development system is presented. It consists of both electrical drive types: DC and AC. In order to implement the optimal control for AC drive system an Altivar 71 inverter, a Frato magnetic particle brake (as load), three-phase induction machine, and dSpace 1104 controller have been used. Theon-line solution of the matrix Riccati differential equation (MRDE) is computed by dSpace 1104 controller, based on the corresponding feedback signals, generating the optimal speed reference for the AC drive system. The optimal speed reference is tracked by Altivar 71 inverter, conducting to energy reduction in AC drive. The classical control (consisting of rotor field oriented control with PI controllers) and the optimal one have been implemented by designing an adequate ControlDesk interface. The three-phase induction machine (IM) is controlled at constant flux. Therefore, the linear dynamic mathematical model of the IM has been obtained. The optimal control law providestransient regimes with minimal energy consumption. The obtained solution byintegration of the MRDE is orientated towards the numerical implementation-by using azero order hold. The development system is very useful for researchers, doctoralstudents or experts training in electrical drive. The experimental results are shown.
Elasticity of compressed microgel suspensions
G. Romeo,M. Pica Ciamarra
Physics , 2013, DOI: 10.1039/C3SM50222H
Abstract: We describe the elasticity of compressed microgel suspensions starting from a core--shell model for the single particle. The mechanical properties of the inner core and of the outer corona are described via the mean field Flory theory, and via the Alexander--de Gennes model for polymer brushes, respectively. The model successfully reproduces experimental measures of the elastic shear modulus up to a constant factor that we rationalize in the jamming perspective.
Dynamic and Configurational Approach to the Glass Transition by Nanoscale Cooperativity  [PDF]
G. Romeo
Open Journal of Biophysics (OJBIPHY) , 2012, DOI: 10.4236/ojbiphy.2012.23012
Abstract: Here we examine the findings obtained for disaccharide/water mixtures near glass transition that involves cooperative relaxation features on kinetic by viscosity and on thermodynamic behaviour by neutron scattering. Then to address cooperative phenomena that mitigate the Debye-Waller behaviour we invoke Adam-Gibbs’ idea of a cooperative rearranging region. Neutron results suggest that the excess mean square displacement behaves as free volume and is closely connected to an elementary step of the structural relaxation. Then viscosity data evidence a breakdown of the Einstein-Debye relation, decoupling attributed to the intermolecular cooperativity.
Relationships among Health and Spiritual Beliefs, Religious Practices, and Congregational Support in Individuals with Cancer  [PDF]
Clay M. Anderson, Marian L. Smith, Dong Yoon, Brick Johnstone
Open Journal of Medical Psychology (OJMP) , 2012, DOI: 10.4236/ojmp.2012.14012
Abstract: To assess relationships among physical health, mental health, spiritual experiences, religious practices, and perceived congregational support for individuals with cancer. Design: A cross-sectional analysis of 56 individuals from outpatient settings (25 with cancer, 31 healthy controls). Measures: Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS; [1]); Medical Outcomes Scale-Short Form 36 (SF-36) General Health Perception (GHP) and General Mental Health (GMH) scales. Results: Participants with cancer reported significantly higher levels of Daily Spiritual Experiences and Religious Support on the BMMRS than the Healthy Controls. No BMMRS subscales were significantly correlated with the SF-36, although the BMMRS subscales had larger correlations with the SF-36 GMH scale (mean = 0.23; range = 0.14 - 0.37) than the GHP scale (mean = 0.16; range = 0.01 - 0.33). Conclusions: Individuals with cancer rely on spiritual beliefs and congregations support more than healthy controls. Statistical trends indicate that individuals with cancer use spiritual, religious, and congregational support factors primarily to assist them in emotion-ally coping with their disease, rather than to improve physical health.
Effect of drying, chemical and natural processing methods on black Biancolilla olives
Romeo, F. V.,Piscopo, A.,Poiana, M.
Grasas y Aceites , 2012, DOI: 10.3989/gya.095811
Abstract: In the present work, the effects of different drying and brining treatments on pigmented Biancolilla olives were evaluated. The olive cultivar considered is typical of Sicily and was harvested at pigmented state. The carpological data revealed its good quality as table olives. A preliminary fermentation in brine was applied to the samples. Half of the samples were dried whereas the remaining olives were subjected to three different lye treatments and oxidation steps. After washing, the olives were stored according to a natural fermentation or drying process with or without a pretreatment of iron gluconate. The fermentation and oxidation steps conditioned the hygienic characteristics of the final product affecting the pH value of the brine. The use of iron salt for improving the darkening rate of processed olives influenced the color parameters as expected. The oxidation and the addition of iron salt affected the texture of dried olives making them softer than those directly dried. The results suggest that the Biancolilla cultivar is suitable for fermentation in brine without any previous treatment such as oxidation. En el presente trabajo se han evaluado los efectos de los diferentes tratamientos de secado y salado para aceitunas pigmentadas Biancolilla. La variedad de aceituna seleccionada es considerada la típica de Sicilia y fue cosechada en el estadío de pigmentación. Los datos morfolóficos revelan su buena calidad como aceituna de mesa. Se ha aplicado a las muestras una fermentación preliminar. La mitad de ellas se secaron, mientras que las restantes fueron sometidas a tres tratamientos diferentes con lejía y procesos oxidantes. Después del lavado, las aceitunas se almacenan mediante una fermentación natural o proceso de secado, con o sin un pretratamiento de gluconato de hierro. Los pasos de fermentación y oxidación condicionan las características higiénicas del producto final afectando al valor del pH de la salmuera. El uso de la sal de hierro para mejorar la velocidad de oscurecimiento de las aceitunas procesadas influyó sobre los parámetros del color como se esperaba. La oxidación y la adición de la sal de hierro afectó a la textura de las aceitunas secas haciéndolas más blandas que las secadas directamente. Los resultados sugieren que la variedad Biancolilla es adecuada para la fermentación en salmuera, sin ningún tratamiento, tal como la oxidación.
Quantum pumping and rectification effects in Aharonov-Bohm-Casher ring-dot systems
F. Romeo,R. Citro,M. Marinaro
Physics , 2008, DOI: 10.1103/PhysRevB.78.245309
Abstract: We study the time-dependent transport of charge and spin through a ring-shaped region sequentially coupled to a weakly interacting quantum dot in the presence of an Aharonov-Bohm flux and spin-orbit interaction. The time-dependent modulation of the spin-orbit interaction, or of the corresponding Aharonov-Casher flux, together with the modulation of the dot-level induces an electrically pumped spin current even in absence of a charge current. The results beyond the adiabatic regime show that an additional rectification current proportional to \cos(\phi), being \phi the relative phase between the time varying parameters, is generated. We discuss the relevance of such term in connection with recent experiments on out-of-equilibrium quantum dots.
Zero-conductance resonances and spin-filtering effects in ring conductors subject to Rashba coupling
R. Citro,F. Romeo,M. Marinaro
Physics , 2006, DOI: 10.1103/PhysRevB.74.115329
Abstract: We investigate the effect of Rashba spin-orbit coupling and of a tunnel barrier on the zero conduc- tance resonances appearing in a one-dimensional conducting Aharonov-Bohm (AB) ring symmet- rically coupled to two leads. The transmission function of the corresponding one-electron problem is derived within the scattering matrix approach and analyzed in the complex energy plane with focus on the role of the tunnel barrier strength on the zero-pole structure characteristic of trans- mission (anti)resonances. The lifting of the real conductance zeros is related to the breaking of the spin-reversal symmetry and time-reversal symmetry of Aharonov-Casher (AC)and AB rings, as well as to rotational symmetry breaking in presence of a tunnel barrier. We show that the polarization direction of transmitted electrons can be controlled via the tunnel barrier strength and discuss a novel spin-filtering design in one-dimensional rings with tunable spin-orbit interaction.
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