نتایج جستجو برای: radio direction finding system
تعداد نتایج: 2610712 فیلتر نتایج به سال:
This paper presents the design and fabrication of a wideband array antenna module for two-dimensional (2-D) interferometer direction-finding system. The comprises an installation panel, spiral antennas, absorbers, radome. absorber was configured to minimize phase difference between vertical horizontal polarizations reduce degradation performance. Rubber foam absorbers were applied in hybrid for...
1Universidade Tecnológica Federal do Paraná, UTFPR, Av. Alberto Carazzai 1640, 86300-000 Cornelio Procópio-PR, Brazil. 2Basque Center for Applied Mathematics, BCAM, Alameda de Mazarredo 14, E-48009 Bilbao, Vizcaya, Spain. 3Universidade de Brası́lia, UnB, FT, Gleba A, SG11, 70910-900 Brası́lia-DF, Brazil. 4Universidade Estadual de Campinas, UNICAMP, FEEC-DT, Av. Albert Einstein 400, 13083-852 Camp...
Linear systems controlled by a nonlinear version of the PI algorithm are under study. The modified PI controller in question is known in the literature as the Super–Twisting (STW) algorithm (see Levant (1993)), and it belongs to the family of second order sliding mode controllers. The considered closed–loop system exhibits self–sustained stable oscillations (chattering) when the relative degree...
Marisa Rangel, Miriam Falkenberg Immunopathology Laboratory, Division of Scientific Development, Butantan Institute, 05503-900, Sao Paulo, Brazil Laboratory of Toxinology, Department of Physiological Sciences, University of Brasilia, 70910-900, Brasilia, DF, Brazil Department of Pharmaceutical Sciences, Federal University of Santa Catarina, 88040-970, Florianopolis, SC, Brazil Journal of Coasta...
We test the importance of multivariate information for modelling and forecasting inflation’s conditional mean and variance. In the literature, the existence of inflation’s conditional heteroskedasticity has been debated for years, as it seemed to appear only in some datasets and for some lag lengths. This phenomenon might be due to the fact that inflation depends on a linear combination of econ...
The basic workings of inflationary models are summarized, along with the arguments that strongly suggest that our universe is the product of inflation. The mechanisms that lead to eternal inflation in both new and chaotic models are described. Although the infinity of pocket universes produced by eternal inflation are unobservable, it is argued that eternal inflation has real consequences in te...
W. L. Yang, A. P. Sorini, C-C. Chen, 3 B. Moritz, W.-S. Lee, F. Vernay, P. Olalde-Velasco, 5 J. D. Denlinger, B. Delley, J.-H. Chu, 6, 7 J. G. Analytis, 6, 7 I. R. Fisher, 6, 7 Z. A. Ren, J. Yang, W. Lu, Z. X. Zhao, J. van den Brink, 9 Z. Hussain, Z.-X. Shen, 6, 7, 3 and T. P. Devereaux 7 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 Stanford Institute for Mat...
A hospital-based cross sectoral serological study was undertaken in Chittagong metropolitan city – the second largest city in Bangladesh to assess the current receptivity of the country for DF/DHF, using the haemagglutination inhibition test (HI). Samples were taken from the suspected cases of dengue infection following the inclusion and exclusion criteria. A total of 253 paired samples was col...
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