Oblique Photogrammetric Analysis of Dome Growth at Mount St. Helens Volcano, 2004 – 2007

This project is an oblique photogrammetric survey of the 2004-2007 dome-building eruption of Mount St. Helens volcano with two primary objectives: (1) to evaluate the potential of a new rapid and low-cost technique to create digital elevation models (DEMs) and subsequently calculate dome volumes and extrusion rates at Mount St. Helens; and (2) to attempt to understand mechanics associated with lava dome extrusion and collapse by analyzing volumetric and extrusion rate measurements in the context of dome height measurements, seismicity data, and migration of the locus of dome growth. The new method uses sets of oblique aerial photographs, acquired from a helicopter with a standard digital camera, and commercially available photogrammetry software to create DEMs. Twelve sets of overlapping digital images from November 2004 to April 2007 of the growing dome inside the crater of Mount St. Helens were used to produce DEMs. Analyses of the digital images were carried out using PhotoModeler software, which produces three dimensional coordinates of points identified in multiple photos. The DEMs were used for qualitative and quantitative descriptions of the 2004-2007 eruption. The DEMs were used to calculate height, volume, and extrusion rate, and to track changes in these quantities through time. These quantities show a decreasing extrusion rate through time that has remained lower than 1 m3/s since October 2005. Total dome volume had reached 94x106 m3 as of April 2007, a larger volume than that of the 1980-1986 Dome. Quantitative evaluation of the DEMs also shows a relationship between dome height and extrusion rate, which varies with the character of eruptive activity. Results were validated by comparing volume measurements derived from traditional aerophotogrammetric surveys run by the USGS Cascades Volcano Observatory. The new oblique photogrammetric technique yields estimates of eruptive volume consistently within 5% of the volumes estimated with traditional surveys. The end result of this project is a new technique that provides inexpensive, rapid assessment of volcanic activity that can be an important supplement to volcano monitoring worldwide

The phenotype and genotype of adult obstructive sleep apnoea/hypopnoea syndrome

To access publisher full text version of this article. Please click on the hyperlink in Additional Links fieldObstructive sleep apnoea/hypopnoea syndrome (OSAHS) is a common condition affecting approximately 2-4% of the middle-aged population. A hereditary component to the condition has long been recognised but its genetic basis has been difficult to elucidate. Progress in determining the genotype of OSAHS is hampered by the lack of a consistent definition of phenotype and the large environmental influences on its expression. "Intermediate phenotypes", such as craniofacial structure, obesity and upper airway control, have been utilised. Multiple gene polymorphisms have been explored in association with the latter, as well as with the sequelae of OSAHS, such as hypertension and increased insulin resistance. To date, two genome-wide scans have identified potential regions that may be of interest in further defining the intermediate phenotypes. The present paper focuses on human studies with an update of the most recent work in the area, including a short discussion on methods of genetic studies

THE ROLE OF DENTISTRY IN FEDERAL-STATE-LOCAL COMPREHENSIVE HEALTH PLANNING *

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65702/1/j.1752-7325.1968.tb01419.x.pd

A luminosity monitor for the A4 parity violation experiment at MAMI

A water Cherenkov luminosity monitor system with associated electronics has been developed for the A4 parity violation experiment at MAMI. The detector system measures the luminosity of the hydrogen target hit by the MAMI electron beam and monitors the stability of the liquid hydrogen target. Both is required for the precise study of the count rate asymmetries in the scattering of longitudinally polarized electrons on unpolarized protons. Any helicity correlated fluctuation of the target density leads to false asymmetries. The performance of the luminosity monitor, investigated in about 2000 hours with electron beam, and the results of its application in the A4 experiment are presented.Comment: 22 pages, 12 figures, submitted to NIM

Computerized cognitive training in prostate cancer patients on androgen deprivation therapy: a pilot study

© 2017, Springer-Verlag GmbH Germany, part of Springer Nature. Purpose: Prostate cancer patients who have undergone androgen deprivation therapy (ADT) may experience cognitive impairment, yet there is an unmet need for nonpharmacological interventions to address cognitive impairment in this population. This study examines the feasibility, acceptability, and preliminary efficacy of a home-based computerized cognitive training (CCT) program to treat cancer-related cognitive impairment. Methods: Sixty men who had received ≥ 3 months of ADT were screened for at least mild cognitive or neurobehavioral impairment and randomized to 8 weeks of CCT or usual care. Follow-up assessments occurred immediately post-intervention or equivalent (T2) and 8 weeks later (T3). The acceptability of CCT was also assessed. Results: Feasibility:A priori feasibility thresholds were partially met (i.e., randomization rate \u3e 50%, retention rate \u3e 70% excluding CCT drop-outs, but \u3c 70% for intent-to-treat). Acceptability: Participants were mostly satisfied with CCT and found it somewhat enjoyable, though barriers to uptake existed. Preliminary efficacy: Linear mixed models indicated significant time by group effects favorable to CCT in reaction time (p =.01), but unfavorable to CCT in verbal and visual memory (ps \u3c .05). Memory was temporarily suppressed in the CCT group at T2, but normalized by T3. There was no effect of CCT on self-reported cognitive functioning, neurobehavioral functioning, nor quality of life. Conclusions: This study provides tentative support for the feasibility and acceptability of CCT to treat mild cognitive impairment in ADT patients. CCT had a beneficial effect on reaction time, but temporarily suppressed memory. CCT’s benefits may be limited to a narrow area of functioning. Larger-scale studies are needed