Wide Band Measurements
Mostrando 13-20 de 20 artigos, teses e dissertações.
-
13. UtilizaÃÃo do dosÃmetro Fricke para dosimetria de mÃquinas teleterapÃuticas, irradiadores gammacel e aparelhos de raios-X superficiais
The chemical dosimetry has been used as a reference in the measurement of the absorbed dose, with the Fricke dosimeter, at standardization laboratories. This dosimeter is considered an absolute dosimetric standard for measurements of radiation doses ranging from 20 to 400 Gy, covering a wide energy spectrum, from X-ray, g-ray to fast electron beam. The objec
Publicado em: 2006
-
14. Metodo de sincronização de cameras de video utilizando a banda de audio
This work proposes and evaluates a novel method for synchronisation of video cameras using the audio band. The method consists in generating and transmitting an audio signal through radio frequency for receivers connected to the microphone input of the cameras and inserting the signal in the audio band. In a software environment, the phase differences among
Publicado em: 2005
-
15. Transporte quântico em poços parabólicos largos / Transportation wide parabolic quantum wells
The gradual progress, or evolution, of the two-dimensional (2D) toward three-dimensional (3D) Landau states was studied in wide parabolic quantum Wells (W = 1000 6000 Å). As transport technique, we used measurements of the magnetoresistence in intense (B = 0 15 T) and tilted ( = 0 90°; perpendicular parallel) magnetic Field at low temperature (T = 50 Mk).
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2003
-
16. Soybean canopy [Glycine max (L.), Merril photosynthetic pigments estimation by measns of spectral reflectance / Utilização da reflectância espectral para a estimativa de pigmentos fotossintéticos em dosséis de soja [Gycine Max (.L), Merril]
Photosynthetic pigments are essential for plant development, because they are responsible for the incident solar energy absorption used in photosynthesis. Individually quantifying these pigments in great extensions of agricultural crops has been made possible by hyperspectral remote sensing development and these information can be used to produce a more accu
Publicado em: 2002
-
17. WIDE BAND MOBILE CHANNEL CARACTERIZATION / CARACTERIZAÇÃO DO CANAL MÓVEL EM FAIXA LARGA
Com o advento da tecnologia digital nas comunicações móveis, passa a ser de grande importância a caracterização em faixa larga do ambiente. O canal rádio móvel é descrito como um sistema linear variante no tempo e através de técnicas apropriadas determina-se a sua função de transferência. As duas técnicas de sondagem mais conhecidas são estud
Publicado em: 2000
-
18. Propriedades opticas de carvões minerais e grafites
Coals from southern Brazil with high mineral matter content were studied with infrared absorption spectroscopy and reflectivity measurements. The results of Raman and photoluminescence experiments are also reported. Reference measurements were performed on coals with low mineral content and graphite?s (which are structurally similar to the coals with the hig
Publicado em: 1981
-
19. Purification and Characterization of Axial Filaments from Treponema phagedenis Biotype reiterii (the Reiter Treponeme)
Axial filaments have been purified from Treponema phagedenis biotype reiterii (the Reiter treponeme) and partially characterized chemically. The preparations consist largely of protein but also contain small amounts of hexose (3%). Filaments dissociate to subunits in acid, alkali, urea, guanidine, and various detergents. Amino acid analyses show an overall r
-
20. Stratified Growth in Pseudomonas aeruginosa Biofilms
In this study, stratified patterns of protein synthesis and growth were demonstrated in Pseudomonas aeruginosa biofilms. Spatial patterns of protein synthetic activity inside biofilms were characterized by the use of two green fluorescent protein (GFP) reporter gene constructs. One construct carried an isopropyl-β-d-thiogalactopyranoside (IPTG)-inducible gf
American Society for Microbiology.