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Search Results: 1 - 10 of 130724 matches for " Lizeth V.;Rade "
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Architecture of a remote impedance-based structural health monitoring system for aircraft applications
Martins, Luiz G. A.;Finzi Neto, Roberto M.;Steffen Jr., Valder;Palomino, Lizeth V.;Rade, Domingos A.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2012, DOI: 10.1590/S1678-58782012000500008
Abstract: the essence of structural health monitoring (shm) is to develop systems based on nondestructive inspection (ndi) technologies for continuous monitoring, inspection and detection of structural damages. a new architecture of a remote shm system based on electromechanical impedance (emi) measures is described in the present contribution. the proposed environment is employed to automatically monitor the structural integrity of aircrafts and is composed by sensor networks, a signal conditioning system, a data acquisition hardware and a data processing system. the obtained results allow the accomplishment of structural condition-based maintenance strategies, in opposite to those based only on the usage time of the equipment. this approach increases the operational capacity of the structure without compromising the security of the flights. as the environment continually checks for the first signs of damage, possibly reducing or eliminating scheduled aircraft inspections, it could significantly decrease maintenance and repair expenses. furthermore, the usage of this system allows the creation of a historical database of the aircrafts structural integrity, making possible the incremental development of a damage prognosis system (dps). this work presents the proposed architecture and a set of experiments that were conducted in a representative aircraft structure (aircraft window) to demonstrate the effectiveness of the proposed system.
A non-recursive algorithm for polygon triangulation
Stanimirovi? Predrag S.,Krtolica Predrag V.,Stanojevi? Rade
Yugoslav Journal of Operations Research , 2003, DOI: 10.2298/yjor0301061s
Abstract: In this paper an algorithm for the convex polygon triangulation based on the reverse Polish notation is proposed. The formal grammar method is used as the starting point in the investigation. This idea is "translated" to the arithmetic expression field enabling application of the reverse Polish notation method. .
Computational Topology of Equivariant Maps from Spheres to Complements of Arrangements
Pavle V. M. Blagojevic,Sinisa T. Vrecica,Rade T. Zivaljevic
Mathematics , 2004,
Abstract: We use a well known problem in discrete and computational geometry (partitions of measures by $k$-fans) as a motivation and as a point of departure to illustrate many aspects, both theoretical and computational, of the problem of calculating the obstructions for the existence of equivariant maps. A variety of techniques are introduced and discussed with the emphasis on concrete and explicit calculations. This eventually leads (Theorems 18 and 19) to an almost exhaustive analysis of when such maps do or do not exist in the particular case of interest.
What Does BIRADS Provide in Mammography?
Rade Babi?
Acta Facultatis Medicae Naissensis , 2011,
Abstract: It is not enough just to do mammography, but perform a quality one. American Association of Radiologists (American College of Radiology - ACR) introduced a unique and a standard terminology in radiological diagnosis of breast disease calling it the Breast Imaging Reporting and Data System or abbreviated BIRADS. The aim of the paper is to present a modified version of BIRADS classification provided by the American College of Radiology as a standard glossary of radiological terms in the radiological diagnosis of breast disease. The paper material consists of the literature reports and more than 30.000 mammographies performed in the period 1995-2009 in the Radiology Center (former Institute of Radiology) of Clinical Center in Ni . The answer to the question about standardization of terminology is given in the diagnosis of diseases of the breast imaging. BIRADS is shown as a standard glossary of terminology provided by the American College of Radiology. BIRADS is encoded conclusion of breast disease. BIRADS is the standard model of terminology in the imaging diagnosis of breast disease. In the Republic of Serbia, BIRADS is in use in many diagnostic institutions.
A Compactness Theorem for Invariant Connections
Johan Rade
Mathematics , 1997,
Abstract: Necessary and sufficient conditions are given for the Palais-Smale Condition C to hold for the Yang-Mills functional for invariant connections on a principal bundle over a compact manifold of any dimension. It is assumed that the connections are invariant under the action of a compact Lie group on the manifold, and that all orbits of the action have codimension three or less.
Compactness Theorems for Invariant Connections
Johan Rade
Mathematics , 2000,
Abstract: Necessary and sufficient conditions are given for the Palais-Smale Condition C to hold for the Yang-Mills functional for connections that are invariant under a Lie group action on the manifold with orbits of codimension less than or equal to three. As an application the mountain pass lemma is used to give a simple proof of Wang's theorem on the existence of irreducible non-(anti-)selfdual instantons on S^2 x S^2 .
About functions where function input describes inner working of the function
Rade Vuckovac
Computer Science , 2010,
Abstract: This paper argues an existence of a class of functions where function own input makes function description. That fact have impact to the wide spectrum of phenomena such as negative findings of Random Oracle Model in cryptography, complexity in some rules of cellular automata (Wolfram rule 30) and determinism in the true randomness to name just a few.
A new kind of complexity
Rade Vuckovac
Computer Science , 2013,
Abstract: A new class of functions is presented. The structure of the algorithm, particularly the selection criteria (branching), is used to define the fundamental property of the new class. The most interesting property of the new functions is that instances are easy to compute but if input to the function is vague the description of a function is exponentially complex. This property puts a new light on randomness especially on the random oracle model with a couple of practical examples of random oracle implementation. Consequently, there is a new interesting viewpoint on computational complexity in general.
Biological and pomological characteristics of superior walnut selections
Mileti? Rade K.,?iki? Mihajlo,Miti? Nevena V.,Nikoli? Radomirka R.
Genetika , 2003, DOI: 10.2298/gensr0302123m
Abstract: As late spring frosts are a limiting factor to successful growth of walnuts attention was focused on walnut selection in years when late spring frosts occur after bud swelling. This particularly referred to the years of 1998 and 2002, and, partly 2001. In those years, 32 walnut trees were found to produce satisfactory yield in regions severely affected by string spring frosts and were subjected to careful observation in the following years. Of that number, 11 trees were found exceptional. They were characterized by luxuriance, vigour, satisfactory resistance to walnut antracnose, and yielding capacity. Fruits had good quality and favorable characteristics of the shell (smooth, thin, light-colored, easily separable) and kernel (relatively smooth, light-colored, tasty). Fruit mass measured 18.0-9.3 g kernel mass 8.6-4.1 g, and kernel content 55.0-47.0%. The kernel contained 67.0-61.1% oil, 19.3-14.5% crude proteins and 2.65-2.12% mineral matter. All investigated selections had been grafted. They were grown in identical conditions, in collection, and the ones found best for commercial growth were selected.
Variability of pomological characteristics of the umatovka apple
Mileti? Rade K.,?iki? Mihajlo,Miti? Nevena V.,Nikoli? Radomirka R.
Genetika , 2003, DOI: 10.2298/gensr0301051m
Abstract: Variability refers to a process by which differences occur among individuals of the same plant species. However, some characteristics change very little while others, especially quantative ones, change rather quickly and readily even when environmental conditions change slightly. This fact has prompted an investigation aimed to establish the variability of pomological characteristics of the umatovka cv. apple tree, a rather old and autochthonous cultivar grown widely throughout Eastern Serbia. Its special characteristic is an ability to grow and bear fruit without any particular care and cultivation, and in conditions of especially severe water deficiency and drought. umatovka cv. fruits are small- or medium-sized on the average, the length Measuring 51.3 ± 6.62 mm (CV 12.9%), width 55.5 ± 6.35 mm (CV 11.4%), pedicel lenght 19.5 ± 3.2 mm (CV 16.4%) and fruit mass 66.0 ±20.6 g (CV 31.3%). Total soluble dry matter content of the mesocarp varies between 15.6 and 1.92% (CV 12.31%), total sugars 14.3 ± 4.7% (CV 32.8%) and total sour substances 0.95 ± 0.11% (CV 18.6%). Especially examined were the large-sized umatovka fruits measuring 72.0 mm in lenght and width, and 169.4 g in mass.
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