3,591 research outputs found
08/22/1948 Letter from the Boston Herald Traveler Corporation
Letter from Charles F. Collins, Herald Staff of the Boston Herald Traveler Corporation, to Louis-Philippe Gagné.https://digitalcommons.usm.maine.edu/fac-lpg-letters-1948-07-12/1011/thumbnail.jp
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Preliminary Investigation of the Geology and Hydrology of the Laska Siding Area, Hudspeth County, Texas
The Bureau of Economic Geology, The University of Texas at Austin, at the request of the Texas Low-Level Radioactive Waste Disposal Authority, conducted a preliminary investigation of the geology and hydrology of the Laska Siding area in Hudspeth County, Texas. This area is being evaluated as a potential site for a low-level radioactive waste repository to be built on State-owned lands in Trans-Pecos Texas.
The Laska Siding site lies about 9 miles (14.5 km) west of the town of Sierra Blanca. The site was selected for this study because of the presence of previously mapped low-permeability sediments of the Hueco Formation, its relatively low-relief topography, and the probable great thickness of the unsaturated zone in the vicinity. The site is also attractive for a repository because of its proximity and access to a major highway and a railroad.
This investigation consisted of a brief study of the geology and hydrology of the site and surrounding area. The study included a reconnaissance field evaluation of the Balson sediments, mapped faults, and geomorphology, a review of water-level and chemistry data from Texas Water Commission (TWC) Central Records for local water wells, static water level measurements of water wells in the immediate vicinity of the site, and drilling of one test hole on the proposed site.Bureau of Economic Geolog
Dispersion Relations and Rescattering Effects in B Nonleptonic Decays
Recently, the final state strong interactions in nonleptonic B decays were
investigated in a formalism based on hadronic unitarity and dispersion
relations in terms of the off-shell mass squared of the meson. We consider
an heuristic derivation of the dispersion relations in the mass variables using
the reduction LSZ formalism and find a discrepancy between the spectral
function and the dispersive variable used in the recent works. The part of the
unitarity sum which describes final state interactions is shown to appear as
spectral function in a dispersion relation based on the analytic continuation
in the mass squared of one final particles. As an application, by combining
this formalism with Regge theory and SU(3) flavour symmetry we obtain
constraints on the tree and the penguin amplitudes of the decay .Comment: 17 pages, Latex, 2 figure
Genetic relatedness of infecting and reinfecting respiratory syncytial virus strains identified in a birth cohort from rural Kenya
Background: Respiratory syncytial virus (RSV) reinfects individuals repeatedly. The extent to which this is a consequence of RSV antigenic diversity is unclear.
Methods: Six-hundred thirty-five children from rural Kenya were closely monitored for RSV infection from birth through 3 consecutive RSV epidemics. RSV infections were identified by immunofluorescence testing of nasal washing samples collected during acute respiratory illnesses, typed into group A and B, and sequenced in the attachment (G) protein. A positive sample separated from a previous positive by ≥14 days was defined as a reinfection a priori.
Results: Phylogenetic analysis was undertaken for 325 (80%) of 409 identified infections, including 53 (64%) of 83 reinfections. Heterologous group reinfections were observed in 28 episodes, and homologous group reinfections were observed in 25 episodes; 10 involved homologous genotypes, 5 showed no amino acid changes, and 3 were separated by 21–24 days and were potentially persistent infections. The temporal distribution of genotypes among reinfections did not differ from that of single infections.
Conclusions: The vast majority of infection and reinfection pairs differed by group, genotype, or G amino acid sequence (ie, comprised distinct viruses). The extent to which this is a consequence of immune memory of infection history or prevalent diversity remains unclear
Results of the Cooperative Uniform Soybean Tests, 1947 Part I. North Central States
United States Department of Agriculture, Agricultural Research Administration; Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Forage Crops and Diseases Cooperating with State Agricultural Experiment Station
Religious Identity, Religious Attendance, and Parental Control
Using a national sample of adolescents aged 10–18 years and their parents (N = 5,117), this article examines whether parental religious identity and religious participation are associated with the ways in which parents control their children. We hypothesize that both religious orthodoxy and weekly religious attendance are related to heightened levels of three elements of parental control: monitoring activities, normative regulations, and network closure. Results indicate that an orthodox religious identity for Catholic and Protestant parents and higher levels of religious attendance for parents as a whole are associated with increases in monitoring activities and normative regulations of American adolescents
Results of the Cooperative Uniform Soybean Tests, 1948 Part I. North Central States
United States Department of Agriculture, Agricultural Research Administration; Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Forage Crops and Diseases Cooperating with State Agricultural Experiment Station
SNP Genotyping Defines Complex Gene-Flow Boundaries Among African Malaria Vector Mosquitoes
Mosquitoes in the Anopheles gambiae complex show rapid ecological and behavioral diversification, traits that promote malaria transmission and complicate vector control efforts. A high-density, genome-wide mosquito SNP-genotyping array allowed mapping of genomic differentiation between populations and species that exhibit varying levels of reproductive isolation. Regions near centromeres or within polymorphic inversions exhibited the greatest genetic divergence, but divergence was also observed elsewhere in the genomes. Signals of natural selection within populations were overrepresented among genomic regions that are differentiated between populations, implying that differentiation is often driven by population-specific selective events. Complex genomic differentiation among speciating vector mosquito populations implies that tools for genome-wide monitoring of population structure will prove useful for the advancement of malaria eradication
Andromeda XXV -- a dwarf galaxy with a low central dark matter density
Andromeda (And) XXV has previously been reported as a dwarf spheroidal galaxy
(dSph) with little-to-no dark matter. However, the uncertainties on this result
were significant. In this study, we double the number of member stars and
re-derive the kinematics and mass of And XXV. We find that And XXV has a
systemic velocity of and a
velocity dispersion of . With this
better constrained velocity dispersion, we derive a mass contained within the
half-light radius of . This mass
corresponds to a mass-to-light ratio of
,
demonstrating, for the first time, that And XXV has an unambiguous dark matter
component. We also measure the metallicity of And XXV to be
dex, which is in agreement with
previous results. Finally, we extend the analysis of And XXV to include mass
modelling using GravSphere. We find that And XXV has a low central dark matter
density, , making And XXV
a clear outlier when compared to other Local Group (LG) dSphs of the similar
stellar mass. In a companion paper, we will explore whether some combination of
dark matter cusp-core transformations and/or tides can explain And XXV's low
density.Comment: 13 pages, 8 figures (7 main, 1 appendix). Submitted to MNRA
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