Visual detection of point source targets

Visual detection of point source targets in simulated star field backgroun

A follow-up study of graduates and those who left school before graduation at the Major Howard W Beal Memorial High School Shrewsbury, Massachusetts (1938-1947, inclusive)

Thesis (M.A.)--Boston University, 1948. This item was digitized by the Internet Archive

Dynamic balance of experienced and novice rock climbers

Climbing requires heavy use of the upper body muscles in the torso and arms to pull the body vertically or traverse horizontally. The upper body profile of climbers has been characterized, however there is little research that has examined the lower body and its contribution to climbing performance. There are studies that have examined postural control while climbing, but no study has evaluated the dynamic balance of the lower extremities in climbers. For this study, lower body dynamic balance was measured using normalized reach distances of the Star Excursion Balance Test (SEBT). Eighteen adult, indoor climbers (n=12) and non-climbers (n=6) participated in this study. Climbers were designated either Experienced (n=7) or Novice (n=5) based on their reported redpoint ability. Experienced climbers had significantly greater reaches than Novices for the POSTM and MED excursions (p=.045, .002), and significantly greater reaches than Controls for COMP, POST, POSTM, and MED excursions (p=.022, .014, .018, Pp=.023), and in the POSTL and ANTM excursions compared to Controls (p=.027, .011). Novices had smaller symmetry-differences compared to Experienced climbers for COMP and ANTL scores (p=.044, .021). The purpose of this study was to determine lower body dynamic balance in rock climbers with different ability levels. Results of this study partially supported the alternate hypothesis in that Experienced climbers had greater distance in reaches of the SEBT compared to Novices, but only in the POSTM and MED directions

Corrosion control and disinfection studies in spacecraft water systems

Disinfection and corrosion control in the water systems of the Saturn 5 Orbital Workshop Program are considered. Within this framework, the problem areas of concern are classified into four general areas: disinfection; corrosion; membrane-associated problems of disinfectant uptake and diffusion; and taste and odor problems arising from membrane-disinfectant interaction

Exact results for a charged, harmonically trapped quantum gas at arbitrary temperature and magnetic field strength

An analytical expression for the first-order density matrix of a charged, two-dimensional, harmonically confined quantum gas, in the presence of a constant magnetic field is derived. In contrast to previous results available in the literature, our expressions are exact for any temperature and magnetic field strength. We also present a novel factorization of the Bloch density matrix in the form of a simple product with a clean separation of the zero-field and field-dependent parts. This factorization provides an alternative way of analytically investigating the effects of the magnetic field on the system, and also permits the extension of our analysis to other dimensions, and/or anisotropic confinement.Comment: To appear in Phys. Rev.

Special Article: Physical Activity, Physical Fitness, and Cardiovascular Risk Factors in Childhood

In adults, physical activity and exercise training are associated with reduced cardiovascular morbidity and mortality, a reduced likelihood of developing adverse cardiovascular risk factors, and improved insulin sensitivity. In childhood, participation in appropriate physical activity may prevent the development of cardiovascular risk factors in the future and complement treatment of existing cardiovascular risk factors, including hypertension, dyslipidemia, and overweight. Exercise in children can also significantly improve insulin sensitivity independent of weight loss. These e fects are mediated in overweight children by increases in lean body mass relative to fat mass and associated improvements in inflammatory mediators, endothelial function, and the associated adverse hormonal milieu

Moving Beyond Wellness Does Not Work

The article focuses on the worksite wellness program (WWP) made by the employers for maintaining the industrial hygiene and also discusses the challenges faced by the employees in implementing the same in the U.S. Topics discussed include Pennsylvania State University\u27s problematic effort in implementing a WWP

The Costs of Obtaining Environmental Outcomes through Coastal Habitat Restoration

Studies examining the costs of coastal habitat restoration have focused on the cost per acre of restoration or on cost efficiency of various restoration methods. On the other hand, studies examining the benefits of restoration have focused on various ecosystem services that more directly affect welfare including amenity value, storm protection, nutrient retention and biodiversity. We examine a set of 133 Gulf of Mexico coastal habitat restoration projects to estimate the cost of obtaining average annual habitat units (AAHUs), a measure which captures the quantity and, importantly, quality of habitat restored, which is one of the more direct ecosystem service benefits from coastal restoration. AAHUs are the environmental outcome considered during the assessment of proposed projects by decision-makers and therefore are a potential measurement unit that can more closely link costs and benefits of restoration

Moving Beyond Wellness Does Not Work

The article focuses on the worksite wellness program (WWP) made by the employers for maintaining the industrial hygiene and also discusses the challenges faced by the employees in implementing the same in the U.S. Topics discussed include Pennsylvania State University\u27s problematic effort in implementing a WWP