4,225 research outputs found
Revealing Carrier-Envelope Phase through Frequency Mixing and Interference in Frequency Resolved Optical Gating
We demonstrate that full temporal characterisation of few-cycle
electromagnetic pulses, including retrieval of the carrier envelope phase
(CEP), can be directly obtained from Frequency Resolved Optical Gating (FROG)
techniques in which the interference between non-linear frequency mixing
processes is resolved. We derive a framework for this scheme, defined Real
Domain-FROG (ReD-FROG), as applied to the cases of interference between sum and
difference frequency components and between fundamental and sum/difference
frequency components. A successful numerical demonstration of ReD-FROG as
applied to the case of a self-referenced measurement is provided. A
proof-of-principle experiment is performed in which the CEP of a single-cycle
THz pulse is accurately obtained and demonstrates the possibility for THz
detection beyond the bandwidth limitations of electro-optic sampling.Comment: 7 pages, 4 figures. To be submitted for publication in Optics
Express, January 201
A Versatile Pseudo-Random Noise Generator
A detailed design is presented for a digital pseudo-random noise generator. The instrument is built with standard integrated circuits. It produces both binary noise (pseudo-random binary sequences) and white Gaussian noise of variable bandwidth. By setting front panel switches to match tabulated octal codes, one may select a vast number of independent noise programs
Performance and within-hybrid variability of three-way and single-crosses in grain sorghum, Sorghum bicolor (L) Moench
Long and short range multi-locus QTL interactions in a complex trait of yeast
We analyse interactions of Quantitative Trait Loci (QTL) in heat selected
yeast by comparing them to an unselected pool of random individuals. Here we
re-examine data on individual F12 progeny selected for heat tolerance, which
have been genotyped at 25 locations identified by sequencing a selected pool
[Parts, L., Cubillos, F. A., Warringer, J., Jain, K., Salinas, F., Bumpstead,
S. J., Molin, M., Zia, A., Simpson, J. T., Quail, M. A., Moses, A., Louis, E.
J., Durbin, R., and Liti, G. (2011). Genome research, 21(7), 1131-1138]. 960
individuals were genotyped at these locations and multi-locus genotype
frequencies were compared to 172 sequenced individuals from the original
unselected pool (a control group). Various non-random associations were found
across the genome, both within chromosomes and between chromosomes. Some of the
non-random associations are likely due to retention of linkage disequilibrium
in the F12 population, however many, including the inter-chromosomal
interactions, must be due to genetic interactions in heat tolerance. One region
of particular interest involves 3 linked loci on chromosome IV where the
central variant responsible for heat tolerance is antagonistic, coming from the
heat sensitive parent and the flanking ones are from the more heat tolerant
parent. The 3-locus haplotypes in the selected individuals represent a highly
biased sample of the population haplotypes with rare double recombinants in
high frequency. These were missed in the original analysis and would never be
seen without the multigenerational approach. We show that a statistical
analysis of entropy and information gain in genotypes of a selected population
can reveal further interactions than previously seen. Importantly this must be
done in comparison to the unselected population's genotypes to account for
inherent biases in the original population
The Correspondence of Fr Matthew Gaughren OMI (1888-1890)
Em meados de 1888, o padre Matthew Gaughren (1843-1914) foi enviado à Argentina por seu superior, o O.M.I. provincial da Grã-Bretanha, a uma “expedição de mendicância”, que visava arrecadar dinheiro entre os colonos irlandeses para diminuir a dívida da igreja de Nossa Senhora da Graça em Tower Hill. No entanto, Gaughren mudou as prioridades de sua missão na América do Sul e apelou à comunidade de língua inglesa para apoiar os imigrantes irlandeses vindos de Cork, em fevereiro de 1889, no navio a vapor Dresden, e enviados a uma malfadada colônia irlandesa em Napostá, próxima ao porto de Bahía Blanca. Seu pensamento e sua luta são revelados nas cartas a seguir, coletadas de diversos arquivos, que agora estão sendo publicadas, a maioria delas pela primeira vez, em sua forma completa.In mid-1888, Fr Matthew Gaughren (1843-1914) was sent to Argentina by his superior, the O.M.I. provincial in Great Britain, on a “begging expedition”, which aimed at collecting money among the Irish settlers to lessen the debt upon the church of Our Lady of Grace at Tower Hill. However, Gaughren changed the priorities of his mission in South America and appealed to the English-speaking community to support the Irish immigrants who arrived in Buenos Aires in February 1889 on the Dresden steamer ship from Cork and were sent to an ill-fated Irish Colony in Napostá, near the port of Bahía Blanca. His thinking and his struggle are revealed in the following letters, collected from various archival sources, which are now being published, most of them for the first time, in their complete form
Discrimination of Individual Tigers (\u3cem\u3ePanthera tigris\u3c/em\u3e) from Long Distance Roars
This paper investigates the extent of tiger (Panthera tigris) vocal individuality through both qualitative and quantitative approaches using long distance roars from six individual tigers at Omaha\u27s Henry Doorly Zoo in Omaha, NE. The framework for comparison across individuals includes statistical and discriminant function analysis across whole vocalization measures and statistical pattern classification using a hidden Markov model (HMM) with frame-based spectral features comprised of Greenwood frequency cepstral coefficients. Individual discrimination accuracy is evaluated as a function of spectral model complexity, represented by the number of mixtures in the underlying Gaussian mixture model (GMM), and temporal model complexity, represented by the number of sequential states in the HMM. Results indicate that the temporal pattern of the vocalization is the most significant factor in accurate discrimination. Overall baseline discrimination accuracy for this data set is about 70% using high level features without complex spectral or temporal models. Accuracy increases to about 80% when more complex spectral models (multiple mixture GMMs) are incorporated, and increases to a final accuracy of 90% when more detailed temporal models (10-state HMMs) are used. Classification accuracy is stable across a relatively wide range of configurations in terms of spectral and temporal model resolution
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