Macro Cell
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Ferramenta de simulação computacional de canal de propagação em ambiente celular baseado em modelos geométricos estatísticos. / Communication channel simulation tool based on geometrical and statistical model of macro cell environments.
Este trabalho apresenta uma ferramenta de simulação computacional de canal de propagação para ambiente macro-celular baseada em modelos geométricos e no modelo estatístico apresentado no relatório COST 259 DCM. Para a implementação desta ferramenta é realizada, inicialmente, uma abordagem dos principais modelos de predição de perda por propagaç�
Publicado em: 2006
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14. Estudo de modelos de prediÃÃo para telefonia celular
Com o aumento da competitividade por serviÃos de comunicaÃÃes mÃveis, à crescente o interesse no planejamento desse tipo de sistema. Isso vem gerando uma quantidade significativa de novos modelos de prediÃÃo, porÃm hà muitos ainda por serem validados. Este trabalho apresenta um estudo sobre modelos de prediÃÃo para o cÃlculo de campo em uma deter
Publicado em: 2004
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15. RADIO RESEARCH MANAGEMENT TECHNIQUES FOR HIERARCHICAL CELL SYSTEMS / ESTUDO DE TÉCNICAS DE GERÊNCIA DE RECURSOS DE RÁDIO PARA SISTEMAS CELULARES HIERARQUIZADOS
Multilayer cell systems are useful to accommodate high traffic densities while still satisfying the QoS requirements. These systems combine the advantages of microcellular and macrocellular systems which are: the increase of system capacity and the reduction of the number of handoffs, hence decreasing the signaling load. This work address design aspects such
Publicado em: 2003
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16. Modulation of single hyperpolarization-activated channels (i(f)) by cAMP in the rabbit sino-atrial node.
1. The hyperpolarization-activated 'pacemaker' current (i(f)) was recorded in inside-out patches excised from rabbit sino-atrial (SA) node cell membranes. 2. Single-channel activity could be resolved in patches containing only a few channels; the voltage dependence of single-channel size and single-channel conductance (0.97 pS) were similar to those measured
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17. Outer hair cell electromechanical properties in a nonlinear piezoelectric model
A nonlinear piezoelectric circuit is proposed to model electromechanical properties of the outer hair cell (OHC) in mammalian cochleae. The circuit model predicts (a) that the nonlinear capacitance decreases as the stiffness of the load increases, and (b) that the axial compliance of the cell reaches a maximum at the same membrane potential for peak capacita
Acoustical Society of America.
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18. Cytochemical Studies on the Problem of Macronuclear Subnuclei in Tetrahymena
DNA amounts in macronuclei and micronuclei of Tetrahymena pyriformis were measured by Feulgen microspectrophotometry. Assuming that the unreplicated micronucleus is diploid, the unreplicated macronucleus was found to contain approximately 45 times the haploid DNA amount. The relationship of these findings to the 45 independently assorting genetic subunits ch
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19. Association of Experimental Chronic Arthritis with the Persistence of Group A Streptococcal Cell Walls in the Articular Tissue
A single injection of isolated fragments of group A streptococcal cell walls into the joints of rabbits stimulated an initial acute reaction which was followed by a prolonged inflammatory process. The chronic process was characterized by hyperplasia of the synovial cells, diffuse infiltration of the villi by macrophages, and focal collections of lymphocytes
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20. Micro direct inoculation method for the isolation and identification of Chlamydia trachomatis.
Current standard procedures for the isolation and identification of Chlamydia trachomatis are laborious. A more rapid method for the isolation and identification of C. trachomatis has been developed. This method features the use of a multiwell microplate to which trypsinized McCoy cells and specimens are added simultaneously, followed by centrifugation. A si
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21. Distal renal tubular acidosis in mice that lack the forkhead transcription factor Foxi1
While macro- and microscopic kidney development appear to proceed normally in mice that lack Foxi1, electron microscopy reveals an altered ultrastructure of cells lining the distal nephron. Northern blot analyses, cRNA in situ hybridizations, and immunohistochemistry demonstrate a complete loss of expression of several anion transporters, proton pumps, and a
American Society for Clinical Investigation.
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22. Minicultures of Mammalian Cells in a New Plastic Plate
A new disposable micro tissue culture plate was developed and tested for use in virological procedures. Miniature mammalian cell cultures (minicultures) were grown in these plates. Each plate contained 96 circular cultures in flat wells (7 mm in diameter). Replicate titrations of a number of viruses were performed in various tissues. Excellent reproducibilit
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23. Faithful expression of a heterologous gene carried on an artificial macronuclear chromosome in Euplotes crassus.
Macronuclear chromosomes of hypotrichous ciliates are gene-sized molecules carrying the coding sequence flanked by short non-translated regions and bounded by telomeres. We have constructed artificial chromosomes for investigation of transcription in the macronucleus of Euplotes crassus. The neo gene was put under the control of the 5"-non-translated region
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24. PNA interference mapping demonstrates functional domains in the noncoding RNA Xist
The noncoding RNA Xist has been shown to be essential for X-chromosome inactivation and to coat the inactive X-chromosome (Xi). Thus, an important question in understanding the formation of Xi is whether the binding reaction of Xist is necessary for X-chromosome inactivation. In this article, we demonstrate the failure of X-chromosome silencing if the associ
The National Academy of Sciences.