Infrared photometry of the 1982-4 eclipse of Epsilon Aurigae

The infrared photometry of epsilon Aur performed prior to and during the ingress phase of the recent eclipse allowed the first solid determination of the temperature of the secondary object. The eclipse depth was significantly less at lambda 5 micrometers than in the near-infrared. This is explained by a model of the secondary as an opaque and very cool object with a temperature of approx. 500 K. During eclipse, the secondary blocks approximately 45% of the near infrared radiation from the primary star. At the same time, the radiation from the secondary remains completely unobscured, resulting in a shallower light curve at longer wavelengths. This phenomenon is well known in the study of eclipsing binary stars; if the two stars have different colors, then the net color of the system changes during eclipse. In the case of epsilon Aur, the eclipsing object has a color deep in the infrared, so the effect is only noticeable there

Users guide for guidance and control Launch and Abort Simulation for Spacecraft (LASS), volume 1

The mathematical models and computer program which are used to implement LASS are described. The computer program provides for a simulation of boost to orbit and abort capability from boost trajectories to a prescribed target. The abort target provides a decision point for engine shutdown from which the vehicle coasts to the vicinity of the selected abort recovery site. The simulation is a six degree of freedom simulation describing a rigid body. The vehicle is influenced by forces and moments from nondistributed aerodynamics. An adaptive autopilot is provided to control vehicle attitudes during powered and unpowered flight. A conventional autopilot is provided for study of vehicle during powered flight

Free radical formation during machining and fracture of polymers

Electron paramagnetic resonance measurements of free radical formation during cutting and grinding of polymer

Use and Adoption of Marketing Methods by Western Canadian Producers

The use of forward marketing techniques is viewed in this thesis as a technological adoption by the producer and has been an area of interest for research in the United States since the 1980s. Unfortunately this research has not occurred in Canada. Reasons for this lack of research may include that one institution was legislated the task of marketing the majority of Canadian export wheat. As of August 12th, 2012 Canadian policy has changed to allow all Canadian wheat to be marketed by producers. This thesis attempts to add some geographic diversity to the literature by asking Canadian producers for a history of their marketing choices. Comparisons are made between the two most prevalent crops of wheat and canola. This thesis also takes advantage of the major change in policy to attempt to identify similarities between producers who adopt specific marketing techniques. Producers were directly surveyed on their use of marketing techniques from the year 2010 through 2013. Data from a total of 295 responses are presented to give an overview of what technologies are being used to market wheat and canola by producers on the Canadian prairie. Producers were also asked questions about their personality and farm enterprise, and to identify if they had increased their use of a marketing technique after the policy change of 2012. The responses were analyzed through probit regression. This thesis finds that forward contracting is the most prevalent marketing technique used by Canadian producers for wheat and canola. Use of futures markets and options markets are a distant second and third respectively. Rates of use by Canadian producers are found to be similar to rates reported in US research. Regression analysis of producers who increased their use of similar marketing techniques suggests that they share similar personal attributes. Forward contract use is found to increase with previous experience in use. Futures market use is found to increase among those inclined to believe that they control the world around them. Options market use is found to increase among those most comfortable with risk. Several farm demographic variables are also found to be shared among producers, and these findings are found to support similar findings in previous research from the US

International Tourism: An Unrecognized Potential in Rural Tourism Development

This paper presents an overview of international tourism and its role in rural economic development. It briefly describes the current approaches to rural economic development followed by a brief look at international tourism 1n the United States, and the potential for tourism in rural areas is examined. An initial step in assessing the extent to which international tourists visit rural America is determining the factors which currently attract those visitors to rural areas. The purpose of this paper is to profile potential international travelers to rural areas

G and C boost and abort study summary, exhibit B

A six degree of freedom simulation of rigid vehicles was developed to study space shuttle vehicle boost-abort guidance and control techniques. The simulation was described in detail as an all digital program and as a hybrid program. Only the digital simulation was implemented. The equations verified in the digital simulation were adapted for use in the hybrid simulation. Study results were obtained from four abort cases using the digital program

Issues in Rural Community Tourism Development

Policy makers are turning to tourism as a potential industry force that may bring both economic and demographic stability to American rural communities. The systematic planning and appropriate utilization of community related physical, economic, and socio-cultural attributes is the key to the establishment of sustainable tourism. This paper focuses on several issues that are increasingly recognized as critical factors in the community system. Both quality of life and sense of place are emphasized. The paper concludes with broadly defined guidelines for future planning toward sustainable development

Influence of experience and trip characteristics on satisfaction

Feelings of satisfaction have been shown to be an important concept when understanding the experience of the tourist as a gauge of the quality of the experience as well as a measure of potential for future behavior. Further research is needed to better understand what influences feelings of satisfaction. This paper examines the impact of levels of experience/ability and trip characteristics. Results indicate that players with higher levels of ability were more likely to be satisfied with the experience

An Evaluation of Conventional Cephalometric Appraisals

Although lateral cephalographic diagnosis is central to craniofacial skeletal assessment, their classification (categorization) remains largely empiric. In this study, pre- and post-treatment lateral cephalographic dimensional arrays were subjected to the classic numerical taxonomic technique of cluster analysis. The resultant patient groupings (clusters) were not only inconsistent with respect to their Angle malocclusion categories, but also the composition of each cluster group varies depending upon the dimensional arrays analyzed. These findings demonstrate that lateral cephalometric categorization remains largely subjective.Bien que le diagnostic céphalométrique latéral soit essentiel pour l’évaluation du squelette craniofacial, les classifications (catégorisation) restent largement empiriques. Dans le présent travail, les mesures céphalométriques latérales prises avant et après traitement ont été soumises à la technique taxonomique numérique classique de l’analyse de groupe. Les groupes de patients obtenus n’étaient pas compatibles avec leur situation dans la classification des malocclusions d’Angle. De plus, la composition de chaque groupe variait en fonction de l’ordre des dimensions analysées, ces résultats prouvent que la catégorisation céphalométrique latérale reste tout à fait subjective

Three newly-discovered M-dwarf companions of Solar Neighbourhood stars

We present low-resolution spectroscopy of newly-discovered candidate companions to three stars in the Solar Neighbourhood. All three companions are M dwarfs, with spectral types ranging from M4 to M9.5. In two cases, G85-55`B' (M6) and G87-9`B' (M4), we have circumstantial evidence from spectroscopy, photometry and limited astrometry that the systems are physical binaries; in the third, G216-7B (M9.5), comparison of POSS II IIIaF plate material and the 2MASS image indicates common proper motion. The primary star in this system, G216-7A (M0), appears itself to be an unresolved, nearly equal-mass binary. All three low-mass companions are highly likely to be stellar in nature, although G216-7B lies very close to the hydrogen-burning limit.Comment: Accepted for publication in PASP; 21 pages, 6 figure