1,785 research outputs found
Ionescu, Nae
No full textLa personnalité provocatrice de Nae Ionescu, professeur universitaire bucarestois de logique et philosophie, occupe l’attention du critique D. Micu. Ancien élève de C. Rădulescu-Motru et, plus tard, son assistant aux cours de philosophie, Nae Ionescu a eu une influence charismatique sur les consciences de ses propres étudiants, tout comme Mircea Eliade, Constantin Noica, Eugen Ionescu, Emil Cioran. Le seul ouvrage écrit et publié par lui-même c’est sa thèse de doctorat sur la relation entre la logique et les mathématiques, défendue à Göttingen et à Munchen. Ce professeur aimait le journalisme et les sorties en scènes publiques plutôt que le silence de la table à écrire. En conséquence, nous pouvons aujourd’hui consulter ses écrits (un cours de logique et un cours de métaphysique) et connaître sa pensée, grâce au laborieux travail sténographique de ses étudiants loyaux
Fig. 2 in Observation Of Eurasian Otter'S Diel Activity Using Camera Trapping In Central-Eastern Romania
No full textFig. 2. General diel activity of otters in the study area.Published as part of Bouroş, G., Ionescu, D. T. & Hodor, C., 2019, Observation Of Eurasian Otter'S Diel Activity Using Camera Trapping In Central-Eastern Romania, pp. 47-56 in Vestnik Zoologii 53 (1) on page 51, DOI: 10.2478/vzoo-2019-0005, http://zenodo.org/record/645508
Virtual Data Warehouse architecture for real-time WebGIS
No full textEnvironmental monitoring requires that raw data acquired from sensors and/or data repositories be transformed, by scientific analysis, into assessments of current ecosystem conditions and in evolution trends in time and space. The huge data amount produced by different sources, the complexity of the environmental models adopted and the necessary distributed collaboration between scientists and government agencies, require specific applications to process and understand environmental phenomena and validate results. GIS domain received a great deal of attention from the scientific and industrial applications communities. Many algorithms, protocols, and applications have been built through the ears for the collection, investigation, analysis, and synthesis of data obtained from sensors ranging from temperature, pressure, etc. to satellite imaging. Almost all attempts have been made to deal with data obtained from lumped repositories. Little or almost none works are reported about a general and flexible mechanism used to display geo-dependent data as it is generated. In this paper we present a GIS platform whose goal is to efficiently mine, fuse, and exploit environmental data and to synthetically display the results at the pace the data is produces. A Virtual Data Warehouse to use GIS information is proposed to manage and collect data acquired by and from several sources. The proposed platform allows users to access to environmental data collected by different sources, to register, normalize and visualize data for exploring and analyzing complex structure and relationship, to process data using distributed computing resources and web applications. To evaluate the effectiveness of the proposed prototype, we present a case study related to data fusion of Modis files and Geo-Located real sensor data for air quality monitoring
Results of the CO2 diffuse degassing survey from the 2017 IAVCEI CCVG 13th volcanic gas workshop: Pululahua Dome Complex, Ecuador
No full textPululahua is a potentially active andesite anddacite lava dome complex. This paper presents the results of a survey focusedon carbon dioxide (CO2) diffuse degassing at Pululahua, which wasconducted during the 2017 International Association of Volcanology andChemistry of the Earth´s Interior (IAVCEI) Commission of the Chemistry ofVolcanic Gases (CCVG) 13th Gas Workshop. Our objective was toconduct a comprehensive investigation of CO2 diffuse degassing byemploying standard methods for measuring CO2 flux and temperature,and data processing. These methods were applied to map the spatial distributionof the measured parameters, investigate the origin of CO2, andquantify the volcanic CO2 output within the surveyed area ofPululahua. We carried out a total of 350 soil CO2 flux and 329 soiltemperature measurements and collected 12 gas samples for carbon isotopiccomposition analysis, surrounding the three youngest domes in the complex. Inaddition, seventeen CO2 flux measurements over a thermal water poolwere performed. Our findings indicate that the diffuse emission at Pululahua´scrater floor is fed by both biogenic and volcanic CO2. Fluxes fromeach source are similar in magnitude, with approximately 90% of themeasurements falling into an intermediate flux range. The occurrence ofvolcanic CO2 emissions is supported by the carbon isotopiccomposition. Diffuse degassing distribution highlights a CO2 anomalysurrounding the younger domes within the crater. We estimated the CO2 diffuseemission using both statistical and geostatistical approaches over area of 3.36km2, resulting in values of 154.2 t d-1 and 126.2 t d-1respectively. Based on the geostatistical quantification of the total CO2emission from soil degassing, Pululahu´s crater volcanic CO2contribution is estimated between 59 and 97 t d-1. Finally, thepotential hazards associated with the release of cold CO2 atPululahua´s crater are also discussed.Fil: Lamberti, María Clara Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Sierra, D.. Instituto Geofísico de la Escuela Politécnica Nacional; EcuadorFil: Cardellini, C.. Università di Perugia; ItaliaFil: Viveiros, F.. University of the Azores; PortugalFil: Vásconez Müller, A.. Instituto Geofísico de la Escuela Politécnica Nacional; EcuadorFil: Vasconez, F. J.. Instituto Geofísico de la Escuela Politécnica Nacional; EcuadorFil: Narváez, D. F.. Escuela Politécnica Nacional; EcuadorFil: Silva, C.. University Of The Azores; PortugalFil: Melián, G.. Instituto Tecnológico y de Energías Renovables; EspañaFil: Caliro, S.. Istituto Nazionale di Geofisica e Vulcanologia; ItaliaFil: Kis, B. M.. Babeș -Bolyai University; RumaniaFil: Ionescu, A.. Università di Perugia; ItaliaFil: Hidalgo, S.. Instituto Geofísico de la Escuela Politécnica Nacional; Ecuado
Smooth cut-off HRT equations for a scalar phi4 field theory
No full textThe phi(4) scalar field theory in three dimensions, prototype for the study of phase transitions, is investigated by means of the hierarchical reference theory (HRT) in its smooth cutoff formulation. The critical behavior is described by scaling laws and critical exponents which compare favorably with the known values of the Ising universality class. The inverse susceptibility vanishes identically inside the coexistence curve, providing a first principle implementation of the Maxwell construction, and shows the expected discontinuity across the phase boundary, at variance with the usual sharp cutoff implementation of HRT. The correct description of first and second order phase transitions within a microscopic, nonperturbative approach is thus achieved in the smooth cutoff HRT
Embedding Monte Carlo simulation within the stochastic Petri network formalism for the evaluation of the availability of a nuclear safety system
No full textTheory for the phase behaviour of a colloidal fluid with competing interactions
No full textWe study the phase behaviour of a fluid composed of particles which interact via a pair potential that is repulsive for large inter-particle distances, is attractive at intermediate distances and is strongly repulsive at short distances (the particles have a hard core). As well as exhibiting gas-liquid phase separation, this system also exhibits phase transitions from the uniform fluid phases to modulated inhomogeneous fluid phases. Starting from a microscopic density functional theory, we develop an order parameter theory for the phase transition in order to examine in detail the phase behaviour. The amplitude of the density modulations is the order parameter in our theory. The theory predicts that the phase transition from the uniform to the modulated fluid phase can be either first order or second order (continuous). The phase diagram exhibits two tricritical points, joined to each other by the line of second order transitions
Formação de micelas de cloreto de cetilpiridinio em soluções aquosas de dimetilsulfoxido, dimetilformamida e dimetilacetamida
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina. Centro de Ciencias Fisicas e MatematicasA formação de micelas de cloreto de cetilpiridinio (CPC1) em soluções aquosas de dimetilsulfóxido (DMSO), dimetilformamida (DMF) e dimetilacetamida (DMA) foi estudada por meio de tensiometria superficial. Foram realizadas determinações de concentração micelar crítica (CMC) a 25° e 40°C e calcularam-se os parâmetros termodinâmicos DGmic°, DHmic°, DSmic°. As determinações foram efetuadas com soluções do surfactante em água pura e soluções aquosas dos cossolventes a várias frações molares (XCOSS)
Formação de micelas de brometo de cetiltrimetilamonio em soluções aquosas de etileno glicol, glicerol e formamida
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina. Centro de Ciencias Fisicas e MatematicasO processo de micelizacão do brometo de cetiltrimetilamônio (CTAB) em soluções aquosas de glicerol (G), etileno glicol (EG) e formamida (F) foi estudado por meio de tensiometria superficial. A determinação da concentração micelar crítica (CMC) foi feita a duas temperaturas, 25ºC e 40ºC e a partir destes valores calcularam-se parâmetros termodinâmicos tais como energia livre de micelização (DGm°), entalpia de micelizacão (DHm°) e entropia de micelização (DSm°). A 25ºC, para o sistema H2O-CTAB-EG a CMC tem os valores de 0,92x10-3M em água pura e 46,0x10-3M para fração molar de EG(XEG) de 0,744. Para o sistema H2O-CTAB-G, alguns valores representativos de CMC são 1,10x10-3M (XG = 0,057) e 8,50x10-3M (0,687). Para o sistema H2O-CTAB-F a CMC tem o valor de 1,20x10-3M (XF = 0,048), 9.00 x 10-3M (XF=0,311) e 85,0x10-3M para formamida pura. Os valores correspondente de DGmic° para as mesmas frações molares citadas anteriormente são: -4,14 kcal/mol e -1,82 kcal/mol para o sistema H2O-CTAB-EG, -4,04 kcal/mol e -2,82 kcal/mol para o sistema H2O-CTAB-G; -3,98 kcal/mol, -2,79 kcal/mol e -1,46 kcal/mol para o sistema H2O-CTAB-F, respectivamente. A entalpia de micelização, DHm° variou desde -1,03 kcal/mol para água pura até -5,18 kcal/mol para o sistema H2O-CTAB-EG, -3,73 kcal/mol para o sistema H2O-CTAB-G e-3,18 kcal/mol para o sistema H2O-CTAB-F. A entropia de micelizaçção DSm° a 25ºC variou de +10,4 u.e. em água pura até os limites de -11,33 u.e., -3,10 u.e. e -5,78 u.e. para os sistemas H2O-CTAB-EG, H20-CTAB-G e H2O-CTAB-F, respectivamente. Os resultados experimentais indicam que o CTAB forma micelas em água, etileno glicol, glicerol e formamida pura e na faixa inteira de soluções aquosas dos três cossolventes. A adição dos três cossolventes à soluções aquosas de CTAB, diminui a espontaneidade do processo de micelização. Este efeito pode ser explicado em função da formação de pontes de hidrogênio entre a água e os cossolventes
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