840 research outputs found
Log Reduction of E. coli by plasma activated water at differents temperatures
No full textSe muestran los datos de reduccion logaritmica obtenida luego de exponer hasta 15 min bacterias E. coli DH5alfa a diferentes PAWs y temperaturas.Fil: Fina, Brenda Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica. Laboratorio de Descargas Eléctricas; ArgentinaFil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica. Laboratorio de Descargas Eléctricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentin
Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High–Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms
No full textA model of a stationary glow-type discharge in atmospheric-pressure air operated in high-gas-temperature regimes (1000 K 2500 K. The calculated plasma parameters agree with the available experimental data.Fil: Cejas, Ezequiel. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica. Laboratorio de Descargas Eléctricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Mancinelli, Beatriz Rosa. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica. Laboratorio de Descargas Eléctricas; ArgentinaFil: Prevosto, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica. Laboratorio de Descargas Eléctricas; Argentin
Correlation methods in cutting arcs
No full textThe present work applies similarity theory to the plasma emanating from transferred arc, gas-vortex stabilized plasma cutting torches, to analyze the existing correlation between the arc temperature and the physical parameters of such torches. It has been found that the enthalpy number significantly influence the temperature of the electric arc. The obtained correlation shows an average deviation of 3 % from the temperature data points. Such correlation can be used, for instance, to predict changes in the peak value of the arc temperature at the nozzle exit of a geometrically similar cutting torch due to changes in its operation parameters.Fil: Prevosto, Leandro. Universidad Tecnológica Nacional Facultad Regional Venado Tuerto. Grupo de Descargas Eléctricas. Departamento Ingeniería Electromecánica; Argentina.Fil: Kelly, Héctor. CONICET. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física. Instituto de Física del Plasma; Argentina.Peer Reviewe
On the dynamics of cutting arc plasmas: the role of the power supply ripple
No full textThe power sources used in cutting arc torches are usually poorly stabilized and have a large ripple factor. The strong oscillatory components in the voltage and arc current produce in turn, large fluctuations in the plasma quantities. Experimental observations on the dynamics of the nonequilibrium plasma inside the nozzle of a 30 A oxygen cutting torch with a 7 % ripple level of its power source are reported in this work. The observed electron temperature (mean value º 5400 K) shows a rms deviation º 5 % (≤ 300 K), which is of the order of the arc voltage ripple level. A considerable different situation occurs with the plasma density (mean value º 3 ´ 1019 m-3). In this case the rms deviation was º 75 %, much greater than that of the electron temperature.Fil: Prevosto, Leandro. Universidad Tecnológica Nacional Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas; Argentina.Fil: Mancinelli, Beatriz. Universidad Tecnológica Nacional Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas; Argentina.Fil: Kelly, Héctor. CONICET. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física. Instituto de Física del Plasma; Argentina.Peer Reviewe
Fisiología del deterioro con tratamiento de plasma no térmico en semillas de garbanzo (Cicer arietinum L.) 'Felipe UNC-INTA'
No full textTesis (Maestría en Ciencias Agropecuarias. Mención: Tecnología de Semillas)--UNC- Facultad de Ciencias Agropecuarias, 2025Fil: Vélez, Ada Silvana. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Balestrasse, Karina Beatriz. Universidad de Buenos Aires (UBA). Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA); Argentina.Fil: Balestrasse, Karina Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA); Argentina.Fil: Prevosto, Leandro. Universidad Tecnológica Nacional (UTN). Facultad Regional Venado Tuerto; Argentina.La hipótesis de este trabajo se planteó de acuerdo a lo siguiente: Los tratamientos con Plasma no Térmico (PNT) generados con Descargas de Barrera Dieléctrica (DBD) de baja frecuencia (50 Hz) y en aire ambiente, utilizando como gases de arrastre oxígeno (O2) y nitrógeno (N2) aplicados en semillas de garbanzo (Cicer arietinum L.) 'Felipe UNC-INTA’ no provocan deterioro y mantienen la calidad fisiológica en términos de viabilidad, vigor y sanidad. En dicho contexto el objetivo general de este trabajo fue: Evaluar el impacto de los tratamientos con PNT aplicados en semillas de garbanzo (Cicer arietinum L.) 'Felipe UNC-INTA’ para analizar su efecto sobre el deterioro en términos de germinación, vigor y sanidad. Del análisis de las evidencias experimentales, evaluados como conductividad eléctrica masal e individual y poder germinativo en el Capítulo 2, el ajuste del equipo que resultó más efectivo fue: un espacio gaseoso (gap) de diez milímetros y la barrera dieléctrica compuesta por tres capas de Thernophase con una duración de cada tratamiento de tres minutos. Del Capítulo 3 surge que, se mejora la germinación por efecto del tratamiento con PNT O2, dado que aumenta el porcentaje de plántulas normales. En términos del proceso de deterioro, el parámetro de vigor medido por conductividad individual en el tratamiento con PNT O2 mejora categóricamente la calidad del lote tratado. Estas evidencias experimentales indican que el tratamiento con PNT O2 detiene el proceso de deterioro. En relación con el impacto del PNT (O2 y N2) en términos de sanidad, se concluye que los tratamientos reducen significativamente la presencia de patógenos de almacenamiento, como Aspergillus flavus y Rhizopus spp. En el caso de los géneros Cladosporium spp. y Penicillium spp., el tratamiento más eficaz fue el PNT N2. Estos resultados se correlacionan con un mayor porcentaje de plántulas normales y una disminución de la conductividad eléctrica individual observada especialmente en el tratamiento con PNT O2. Del Capítulo 4 se concluye que, desde el fundamento fisiológico, los tratamientos favorecen la respuesta trifásica sobre el proceso de la germinación, activando eficientemente el metabolismo en fase II. Este impacto se manifiesta directamente sobre el embrión, y no se limita únicamente a modificaciones en la cubierta seminal. Esto explica el efecto del tratamiento más allá del ángulo de mojabilidad citado por diversos autores. Otra explicación del impacto de los tratamientos en el proceso de germinación y en la mejora del vigor se fundamenta en una mayor partición de asimilados hacia la raíz y la optimización del balance hídrico seguidos de una mayor velocidad en la germinación. Del Capítulo 5 surge que los tratamientos con PNT (N2 y O2) retrasan el deterioro y promueven el vigor de las semillas de garbanzo (Cicer arietinum L.) 'Felipe UNC-INTA’ durante el almacenamiento, al generar cambios fisiológicos, especialmente en la fase II de la respuesta trifásica. Estos tratamientos ralentizan el envejecimiento natural de las semillas, independientemente de las condiciones ambientales. La optimización de la respuesta trifásica, la reducción inicial de patógenos, la mayor viabilidad y vigor, por efecto de los tratamientos, explican la disminución del deterioro durante el almacenamiento poscosecha. El uso de esta tecnología no genera un impacto ambiental negativo; por lo que constituye una alternativa sustentable y muy promisoria para la mejora de la calidad de las semillas.The hypothesis of this work was stated as follows: Non-Thermal Plasma (NTP) treatments generated with low frequency (50 Hz) Dielectric Barrier Discharges (DBD) and in ambient air, using oxygen (O2) and nitrogen (N2) as carrier gases applied to chickpea (Cicer arietinum L.) 'Felipe UNC-INTA' seeds do not cause deterioration and maintain physiological quality in terms of viability, vigor and health. In this context, the general objective of this work was: To evaluate the impact of NTP treatments applied to chickpea (Cicer arietinum L.) 'Felipe UNC-INTA' seeds to analyze their effect on deterioration in terms of germination, vigor and health. From the analysis of experimental evidence, evaluated as bulk and individual electrical conductivity and germination power in Chapter 2, the most effective equipment adjustment was: a gaseous space (gap) of ten millimeters and the dielectric barrier composed of three layers of Thernophase with a duration of three minutes each. From Chapter 3, it emerges that germination is improved by the effect of treatment with PNT O2, since it increases the percentage of normal seedlings. In terms of the deterioration process, the vigor parameter measured by individual conductivity in the treatment with PNT O2 categorically improves the quality of the treated batch. This experimental evidence indicates that treatment with PNT O2 halts the deterioration process. Regarding the impact of PNT (O2 and N2) in terms of health, it is concluded that the treatments significantly reduce the presence of storage pathogens, such as Aspergillus flavus and Rhizopus spp. In the case of the genera Cladosporium spp. and Penicillium spp., the most effective treatment was NTP N2. These results correlate with a higher percentage of normal seedlings and a decrease in individual electrical conductivity observed especially in the O2 NTP treatment. Chapter 4 concludes that, from a physiological basis, the treatments favor the triphasic response to the germination process, efficiently activating phase II metabolism. This impact is directly manifested in the embryo and is not limited solely to modifications in the seed coat. This explains the effect of the treatment beyond the wettability angle cited by various authors. Another explanation for the impact of the treatments on the germination process and the improvement in vigor is based on a greater partitioning of assimilates towards the root and the optimization of the water balance followed by a higher germination speed. Chapter 5 shows that NTP (N2 and O2) treatments delay deterioration and promote the vigor of chickpea (Cicer arietinum L.) 'Felipe UNC- INTA' seeds during storage by generating physiological changes, especially in phase II of the triphasic response. These treatments slow down the natural aging of seeds, regardless of environmental conditions. The optimization of the triphasic response, the initial reduction of pathogens, and the increased viability and vigor due to the treatments explain the decrease in deterioration during post-harvest storage. The use of this technology does not generate a negative environmental impact; therefore, it constitutes a sustainable and very promising alternative for improving seed quality.Fil: Vélez, Ada Silvana. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Balestrasse, Karina Beatriz. Universidad de Buenos Aires (UBA). Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA); Argentina.Fil: Balestrasse, Karina Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA); Argentina.Fil: Prevosto, Leandro. Universidad Tecnológica Nacional (UTN). Facultad Regional Venado Tuerto; Argentina
Leandro Castelluccio – Complete Works Archive
No full textThis repository preserves the essential body of work of Leandro Castelluccio—author, psychologist, cognitive neuroscientist, and thinker—whose writings explore the intersections between philosophy, consciousness, ethics, psychology, and neuroscience.
The purpose of this archive is twofold. First, to ensure long-term open access to these works as a cultural and intellectual contribution available to all, beyond technological platforms, institutional constraints, or temporal limitations. Knowledge, at its best, belongs to everyone and transcends the contingencies of the moment.
Second, this archive invites a living intellectual dialogue. Ideas evolve when they are read, re-interpreted, questioned, and expanded upon. The works preserved here are offered not as static monuments, but as open spaces for reflection and co-creation—where new interpretations, studies, and philosophical developments may emerge through time.
This project is organized into curated components that group books, essays, and research publications. All materials reflect final or published versions intended for public and scholarly reference
The Impact of the Use of Large Non-Linear Lighting Loads in Low-Voltage Networks
No full textThe principal numerical and experimental results obtained by the authors on the harmonicpower losses in low-voltage networks in the lighting area have been summarizedin this review. Light-emitting diodes (LEDs) and compact fluorescent lamp (CFL) loadswere considered. Four-core cables and four single-core cable arrangements were examined.The cables were modeled by using electromagnetic finite element analysis software.It was found that the cross section of the neutral conductor plays an important role in thederating of the cable ampacity due to the presence of a high level of triplen harmonics inthe distorted current. In order to reduce the third-order harmonic currents in the neutralconductor, an experimental investigation of diversity factors for LED in combination withCFL and LED lamps was also performed. Attention was paid to the reduction of the thirdorderharmonic current, which is mainly responsible for the strong increase in powerlosses in the neutral conductor of low-voltage installations. The convenience of havingLED lamps designed to operate as two-phase loads is suggested for certain applications.Fil: Milardovich, Natalio Jorge. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica. Laboratorio de Descargas Eléctricas; ArgentinaFil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica. Laboratorio de Descargas Eléctricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Lara, Miguel Angel. Universidad Nacional de Rosario; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Milardovich, Diego. Universidad Nacional de Rosario; Argentin
Glow discharge in a high-velocity air flow: The role of the associative ionization reactions involving excited atoms
No full textA kinetic scheme for non-equilibrium regimes of atmospheric pressure air discharges is developed. A distinctive feature of this model is that it includes associative ionization with the participation of N(2D, 2P) atoms. The thermal dissociation of vibrationally excited nitrogen molecules and the electronic excitation from all the vibrational levels of the nitrogen molecules are also accounted for. The model is used to simulate the parameters of a glow discharge ignited in a fast longitudinal flow of preheated (T0 = 1800–2900 K) air. The results adequately describe the dependence of the electric field in the glow discharge on the initial gas temperature. For T0 = 1800 K, a substantial acceleration in the ionization kinetics of the discharge is found at current densities larger than 3 A/cm2 , mainly due to the N(2P) + O(3P) → NO+ + e process; being the N(2P) atoms produced via quenching of N2(A3P u +) molecules by N(4S) atoms. Correspondingly, the reduced electric field noticeably falls because the electron energy (6.2 eV) required for the excitation of the N2(A3P u +) state is considerably lower than the ionization energy (9.27 eV) of the NO molecules. For higher values of T0, the associative ionization N(2D) + O(3P) → NO+ + e process (with a low–activation barrier of 0.38 eV) becomes also important in the production of charged particles. The N(2D) atoms being mainly produced via quenching of N2(A3P u +) molecules by O(3P) atoms.Fil: Cejas, Ezequiel. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Mancinelli, Beatriz Rosa. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto; ArgentinaFil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Langmuir probe diagnostics of an atmospheric pressure, vortex–stabilized nitrogen plasma jet
No full textLangmuir probe measurements in an atmospheric pressure direct current (dc) plasma jet are
reported. Sweeping probes were used. The experiment was carried out using a dc non–transferred
arc torch with a rod–type cathode and an anode of 5mm diameter. The torch was operated at a
nominal power level of 15kW with a nitrogen flow rate of 25 Nl min 1. A flat ion saturation region
was found in the current–voltage curve of the probe. The ion saturation current to a cylindrical
probe in a high–pressure non local thermal equilibrium (LTE) plasma was modeled. Thermal
effects and ionization/recombination processes inside the probe perturbed region were taken into
account. Averaged radial profiles of the electron and heavy particle temperatures as well as the
electron density were obtained. An electron temperature around 11 000 K, a heavy particle
temperature around 9500K and an electron density of about 4 1022m 3, were found at the jet
centre at 3.5mm downstream from the torch exit. Large deviations from kinetic equilibrium were
found throughout the plasma jet. The electron and heavy particle temperature profiles showed good
agreement with those reported in the literature by using spectroscopic techniques. It was also found
that the temperature radial profile based on LTE was very close to that of the electrons. The
calculations have shown that this method is particularly useful for studying spraying–type plasma
jets characterized by electron temperatures in the range 9000–14 000 K. VC 2012 American Institute
of Physics. [http://dx.doi.org/10.1063/1.4752886]Fil: Prevosto, Leandro. Universidad Tecnológica Nacional Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas; Argentina.Fil: Kelly, Héctor. CONICET. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física. Instituto de Física del Plasma; Argentina.Fil: Mancinelli, Beatriz. Universidad Tecnológica Nacional Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas; Argentina.Peer Reviewe
Numerical Simulation of the Voltage–Current Characteristic of an Atmospheric Pressure Discharge: The Glow-to-Arc Transition
No full textThe glow-to-arc transition of a convection-stabilized atmospheric pressure air discharge is numerically investigated. Two separate models are considered: a one-dimensional axisymmetric time-dependent fluid model of the positive column, describing the thermal-instability, and a sheath model of a cold cathode describing the field-emission instability, which must then be properly matched together. The fluid model considers the most important chemical reactions in air plasma, including thermal ionization in atomic collisions. The radial electric field in the plasma is obtained from the Poisson equation. The voltage–current characteristic of the discharge is simulated for a time-varying current up to 300 mA. It is found that at some critical value slightly above 200 mA, the contraction of the positive column arises from a vibrational–translational energy relaxation. The subsequent increases in the discharge current density in the positive column drive in turn a field-emission instability in the cathode, which is accompanied by a large voltage drop. Simulation results are validated against available experimental data.Fil: Cejas, Ezequiel. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Reg.venado Tuerto. Departamento de Ing.electromecanica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Minotti, Fernando Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física del Plasma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física del Plasma; Argentin
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