334 research outputs found
Efeito alelopático dos extratos da aroeira-preta Myracrodruon urundeuva Allemão na germinação e no desenvolvimento da radícula e do hipocótilo das sementes das braquiárias Urochloa brizantha e Urochloa decumbens.
General Strategies for Isolating the Genes Encoding Type I Collagen and for Characterizing Mutations Which Produce Osteogenesis Imperfecta a
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73326/1/j.1749-6632.1988.tb55325.x.pd
Osteogenesis Imperfecta: The Molecular Basis of Clinical Heterogeneity a
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73685/1/j.1749-6632.1988.tb55324.x.pd
Avaliação do potencial larvicida de espécies vegetais brasileiras contra o carrapato do gado Rhipicephalus (Boophilus) microplus (Canestrini, 1887).
Investigação da atividade acaricida de extratos de espécies vegetais nativas e exóticas sobre as larvas do carrapato Rhipicephalus (Boophilus) microplus.
Investigação biodirigida da atividade carrapaticida de espécies vegetais brasileiras nativas e exóticas.
Avaliação da atividade acaricida de Guarea guidonia (L.) Sleumer (Meliaceae) sobre larvas do carrapato Rhipicephalus (Boophilus) microplus.
High-frequency seismic interferometry: broadband measurements of surface-wave phase velocities using “large-N” arrays
High-frequency seismic surface waves sample the top few tens of meters to the top few kilometres
of the subsurface. They can be used to determine three-dimensional distributions of shear-wave
velocities and to map the depths of discontinuities (interfaces) within the crust. Passive seismic
imaging, using ambient noise as the source of signal, can thus be an effective tool of exploration
for mineral, geothermal and other resources, provided that sufficient high-frequency signal is
available in the ambient noise wavefield and that accurate, high-frequency measurements can be
performed on this signal. Ambient noise imaging using the ocean-generated noise at 5-30 s
periods is now a standard method, but less signal is available at frequencies high enough for
deposit-scale imaging (0.2-30 Hz), and few studies have reported successful measurements in
broad frequency bands. Here, we develop a workflow for the measurement of high-frequency,
surface-wave phase velocities in very broad frequency ranges. Our workflow comprises (1) a new
noise cross-correlation procedure that accounts for the non-stationary properties of the high
frequency noise sources, removes bandpass filtering, replaces temporal normalization with short
time window stacking, and drops the explicit spectral normalization by adopting cross-coherence;
(2) a new phase-velocity measurement method that extends the bandwidth of reliable
measurements by exploiting the (resolved) 2π ambiguity of phase-velocity measurements; (3)
interstation-distance-dependent quality control that uses the similarity of subgroups of dispersion
curves to reject outliers and identify the frequency ranges with accurate measurements. The
workflow is highly automated and applicable to large arrays. Applying our method to data from a
large-N array that operated for one month near Marathon, Ontario, Canada, we use rectangular
subarrays with 150-m station spacing and, typically, 1 hour of data and obtain Rayleigh-wave
phase-velocity measurements in a 0.55-23.8 Hz frequency range, spanning over 5.4 octaves, nearly
twice the typical frequency range of 1.5-3 octaves in previous studies. Phase-velocity maps and the
subregion-average 1D velocity models they constrain show a high-velocity anomaly consistent with
the known, west-dipping gabbro intrusions beneath the area. The new structural information can
improve our understanding of the geometry of the gabbro intrusions, hosting the Cu-PGE
Marathon deposit
Purificação do n-Hexano comercial para aplicação em investigações fitoquímicas.
bitstream/item/114960/1/PROCI-2014.00186.pd
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