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Search Results: 1 - 10 of 549232 matches for " Marco A. O. Schroeder "
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Computer Analysis of Electromagnetic Transients in Grounding Systems Considering Variation of Soil Parameters with Frequency  [PDF]
Marco A. O. Schroeder, Márcio M. Afonso, Tarcísio A. S. Oliveira, Sandro C. Assis
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.412066
Abstract: This paper presents a mathematical model to calculate transients in grounding systems. The derived equations arise from direct application of basic electromagnetic equations in frequency domain, whose solution is obtained by the application of the Moment Methods. A formulation based on experimental measurements is applied to quantify the soil parameters for each frequency. The unified approach is applied in the calculation of the grounding impedance of horizontal electrodes. Results show that the inclusion of frequency dependence of the soil parameters leads to a reduction of the values of grounding impedance, in comparison with results for soils with parameters independent of frequency.
The Casimir Energy for a Hyperboloid Facing a Plate in the Optical Approximation
O. Schroeder,A. Scardicchio,R. L. Jaffe
Physics , 2004, DOI: 10.1103/PhysRevA.72.012105
Abstract: We study the Casimir energy of a massless scalar field that obeys Dirichlet boundary conditions on a hyperboloid facing a plate. We use the optical approximation including the first six reflections and compare the results with the predictions of the proximity force approximation and the semi-classical method. We also consider finite size effects by contrasting the infinite with a finite plate. We find sizable and qualitative differences between the new optical method and the more traditional approaches.
The Neutral Hydrogen Content of Fornax Cluster Galaxies
A. Schroeder,M. J. Drinkwater,O. -G. Richter
Physics , 2001, DOI: 10.1051/0004-6361:20010997
Abstract: We present a new set of deep HI observations of member galaxies of the Fornax cluster. We detected 35 cluster galaxies in HI. The resulting sample, the most comprehensive to date, is used to investigate the distribution of HI in the cluster galaxies. We compare the HI content of the detected cluster galaxies with that of field galaxies by measuring HI mass-to-light ratios and the HI deficiency parameter of Solanes et al. (1996). The mean HI mass-to-light ratio of the cluster galaxies is 0.68+/-0.15, significantly lower than for a sample of HI-selected field galaxies (1.15+/-0.10), although not as low as in the Virgo cluster (0.45+/-0.03). The mean HI deficiency for the cluster is 0.38+/-0.09 (for T=1-6), significantly greater than for the field sample (0.05+/-0.03). Both these tests show that Fornax cluster galaxies are HI-deficient compared to field galaxies. The kinematics of the cluster galaxies suggests that the HI deficiency may be caused by ram-pressure stripping of galaxies on orbits that pass close to the cluster core. We also derive the most complete B-band TF relation of inclined spiral galaxies in Fornax. A subcluster in the South-West of the main cluster contributes considerably to the scatter. The scatter for galaxies in the main cluster alone is 0.50mag, which is slightly larger than the intrinsic scatter of 0.4mag. We use the TF relation to derive a distance modulus of Fornax relative to the Virgo cluster of -0.38+/-0.14mag. The galaxies in the subcluster are 1.0+/-0.5mag brighter than the galaxies of the main cluster, indicating that they are situated in the foreground. With their mean velocity 95km/s higher than that of the main cluster we conclude that the subcluster is falling into the main Fornax cluster.
PPPM (Predictive, Preventive and Personalized Medicine) as a New Model of the National and International Healthcare Services and Thus a Promising Strategy to Prevent a Disease: From Basics to Practice  [PDF]
I. A. Sadkovsky, O. Golubnitschaja, M. A. Mandrik, M. A. Studneva, H. Abe, H. Schroeder, E. N. Antonova, F. Betsou, T. A. Bodrova, K. Payne, S. V. Suchkov
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.514115
Abstract:

Nowadays the system of public health is constructed in such a manner so that its main objective is the recovery of an already sick person, while prediction and prevention receive little attention. Meanwhile the development of these aspects of medicine can lead to the ability to control morbidity among the population, to identify chronic and genetic diseases in the early stages of development, and thus to prevent their further progression. This will reduce traditionally high costs of sick people treatment and the number of disabled population, and improve the quality and duration of life. The elaboration of new fields of science that are working on the study and interpretation of data obtained during laboratory and clinical research, creation of new methods for diagnosis, prognosis and treatment, provides an opportunity now to implement a new strategy, called PPPM, and gets promising results, which should lead to further development of an existing medicine.

Má oclus?o Classe I de Angle, com acentuada biprotrus?o, tratada com extra??es de dentes permanentes
Schroeder, Marco Ant?nio;
Revista Dental Press de Ortodontia e Ortopedia Facial , 2009, DOI: 10.1590/S1415-54192009000400015
Abstract: this case report describes the treatment of an angle class i malocclusion with dental double protrusion and with complete destruction of teeth 16, 26 and 47. the case was treated in two phases and, purposing the double protrusion correction, tooth extractions were necessary. in the first treatment phase, teeth 16, 26, 37 and 47 were extracted and, in the second phase, the extractions of 14, 24, 34 and 44 were performed. this case was presented to the brazilian board of orthodontics and facial orthopedics (bbo), as representative of category 4, i.e., an angle class i malocclusion treated with permanent teeth extractions, as part of the requirements for obtaining the bbo diploma.
Evapotranspira??o de referência com base na radia??o solar global estimada pelo método de Bristow-Campbell
Concei??o, Marco A. F.;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000400006
Abstract: the amount of water used in irrigation systems is usually calculated using the local reference evapotranspiration (eto) values. several methods can be used for eto calculation, and hargreaves method is one of the most popular. this method uses estimated values of global solar radiation (rs), based on the difference between the maximum (tmax) and minimum (tmin) air temperature. however, the rs may be calculated by other methods, such as the bristow-campbell, which also is based on the difference between tmax and tmin. in this study were estimated daily values of eto by the method of hargreaves in jales - sp, brazil, with and without the use of the bristow-campbell equation to calculate the rs. these values were compared with those from the penman-monteith method, which is considered standard for the estimation of eto. the evaluations had considered the wet and dry periods in the region. the use of the bristow-campbell equation improved the performance of the hargreaves method, in relation to the penman-monteith, and the performance during the dry period of the year was higher than that of the wet season.
On Existence of Solution for a Class of Semilinear Elliptic Equations with Nonlinearities That Lies between Different Powers
Claudianor O. Alves,Marco A. S. Souto
Abstract and Applied Analysis , 2008, DOI: 10.1155/2008/578417
Abstract: We prove that the semilinear elliptic equation ?Δ=(), in Ω, =0, on Ω has a positive solution when the nonlinearity belongs to a class whichsatisfies ≤()≤ at infinity and behaves like near the origin, where 1<<(
Observaciones hidrograficas en Bahia Foster y Bahia Chile (Islas Shetland del Sur) enero 1978
Arcos R, Dagoberto;Salamanca O, Marco A.;
Boletim do Instituto Oceanográfico , 1980, DOI: 10.1590/S0373-55241980000200010
Abstract: the hydrographical conditions founded in port foster (deception island) and chile bay (greenwich island) both belong to the south shetlands islands group, antarctic peninsula, has been described. this survey has been carried out from the chilean navy oceanographic vessel "yelcho" in january 1978. an stratification in the area closed with the antarctic surface waters has been observed. the temperature ranged between -1,60 o c to 1,30o c in port foster and 0,46oc to 1,70oc in chile bay; the salinity ranged between 33.80 ‰ to 34,24‰ in port foster and 33,61‰ to 34 ‰ in chile bay; the dissolved oxygen varied between 3,47 to 7,02 ml o2/l in both area. the characteristic density (sigma t) of antarctic surface waters in the area, i.e., 26,92 and 27,58 has been observed.
Observaciones hidrograficas en Bahia Foster y Bahia Chile (Islas Shetland del Sur) enero 1978
Arcos R, Dagoberto;Salamanca O, Marco A;
Brazilian Journal of Oceanography , 1980, DOI: 10.1590/S1679-87591980000200010
Abstract: the hydrographical conditions founded in port foster (deception island) and chile bay (greenwich island) both belong to the south shetlands islands group, antarctic peninsula, has been described. this survey has been carried out from the chilean navy oceanographic vessel "yelcho" in january 1978. an stratification in the area closed with the antarctic surface waters has been observed. the temperature ranged between -1,60 o c to 1,30o c in port foster and 0,46oc to 1,70oc in chile bay; the salinity ranged between 33.80 ‰ to 34,24‰ in port foster and 33,61‰ to 34 ‰ in chile bay; the dissolved oxygen varied between 3,47 to 7,02 ml o2/l in both area. the characteristic density (sigma t) of antarctic surface waters in the area, i.e., 26,92 and 27,58 has been observed.
Mapas conceituais no auxílio à aprendizagem significativa de conceitos da óptica física
Almeida, Voltaire de O.;Moreira, Marco A.;
Revista Brasileira de Ensino de Física , 2008, DOI: 10.1590/S0102-47442008000400009
Abstract: this paper presents the results of an inquiry that approached the difficulties of physics majors in the learning of optical physics concepts, involving misconceptions and the use of concept maps as didactic instrument to facilitate the meaningful learning of these concepts.
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