Artigos científicos, teses e dissertações
Publicados nas melhores instituições de ensino

The knowledge of physical and microphysical properties associated to cloud-ground lightning occurrence is very important for determination of potential forecast parameters of electrical discharges activity. The identification of these parameters could give valuable contribution f...

The harmful lightning effects on the mankind have motivated several investigations on lightning characteristics in the world and, particularly, in Brazil. Many studies on the geographic, seasonal, topographic and demographic features of lightning have been done using lightning lo...

Abstract The Amazon region has high lightning occurrence rates, with many lightning hot spots. Different rivers cross the Amazon rainforests and the people that live there use these rivers as roads to go from one place to another. Every year, lightning deaths are reported in the ...

Electrical fields and current can permeabilize bacterial membranes, allowing for the penetration of naked DNA. Given that the environment is subjected to regular thunderstorms and lightning discharges that induce enormous electrical perturbations, the possibility of natural elect...

The first climatological studies of cloud-to-ground (CG) lightning flashes characteristics in Brazil were published at the middle of 90. However, at that time, the lightning detection network used to be composed by only a few sensors, which restricted the analyses to some specifi...

The occurrence of lightning discharges causes a significant amount of unscheduled supply interruptions in overhead lines of electricity systems, contributing to decrease quality indicators of these systems, even in the case of regions with moderated ground flash density. Focusing...

The case of a 19 year old man struck by lightning is described. He sustained quadriplegia for several months and fully recovered. It is suggested that his weakness was due to extensive peripheral nerve damage. In addition, he displayed many well recognised medical complications o...

Artificial transformation is typically performed in the laboratory by using either a chemical (CaCl2) or an electrical (electroporation) method. However, laboratory-scale lightning has been shown recently to electrotransform Escherichia coli strain DH10B in soil. In this paper, w...

This work presents some specific aspects on the subject “lightning protection of structures“, mainly when the use of structural parts of the buildings as part of the protection systems is concerned. Several polemical issues are discussed, such as: special air-termination, the dis...

In this work it is presented the study of 6 years of detected lightning data in association to the occurrence of mesoscale convective systems in the region located between 15S - 27S and 35W - 55W. The Lightning data were provided by FURNAS Centrais Elétricas S.A. for the period 2...

Over the past ten years, we have cared for 13 patients who suffered serious neurologic complications after being struck by lightning. The spectrum of neurologic lesions includes the entire neuraxis from the cerebral hemispheres to the peripheral nerves. We describe these various ...

Some of the worst damage caused by lightning is indirect, that is, it is caused by electromagnetic fields radiated from this kind of natural phenomenon resulting in electromagnetic compatibility problems or in challenges for designers of surge protection systems and shields again...

The characteristics of lightning currents have a fundamental importance on insulation coordination and on the design of transmission and distribution lines equipment. The CIGRE cumulative frequency distribution curves relative to the main parameters of the first and subsequent do...

This work presents a study of geographic influences on the lightning characteristics in Minas Gerais, in the Southeastern Brazil, within an area delimited by 18° to 21° S and 43° to 47° W. The period of study was eight years, from October 1988 to November 1996. The lightning and ...

Lightning Location Systems (LLSs) are advanced tools to provide data related to lightning occurrence. They employ remote measurements of electromagnetic field that is irradiated by lightning current to provide relevant information for lightning protection application. As any phys...

This work depicts transmission line modeling for lightning strike time domain simulation. It is studied and presented the main mechanisms associated to lightning formation and striking high-voltage transmission lines and wave propagation theory concerned to the hit point. Followi...

Lightning is one of the most important sources of disturbances in distribution systems that can cause permanent or momentary interruptions. The growing concern regarding power quality has created great interest in the interaction of lightning with power systems and an improved pr...

Abstract: This paper presents a methodology that employs the electrostatic field variations caused by thundercloud formation or displacement to generate lightning warnings over a region of interest in Southeastern Brazil. These warnings can be used to prevent accidents during haz...

This work presents the first quantitative study of the continuing current (Icc) in negative cloud-to-ground flashes (-CG) in Brazil. The Icc is a low intensity current that follows some return strokes in -CG flashes. Their long durations result in large charge transfers that are ...

This work presents the first quantitative study of the continuing current (Icc) in negative cloud-to-ground flashes (-CG) in Brazil. The Icc is a low intensity current that follows some return strokes in -CG flashes. Their long durations result in large charge transfers that are ...

The work presents the results of a study based on the application of Lightning Location System (LLS) data and Interruptions data to analyze actual lighting performance of rural distribution lines at Minas Gerais State. The work presents the data used in the development of the cas...