Determining the Magnetism of Small Spacecraft

A satellite has permanent magnetism associated with it resulting from the magnetization of ferrous items distributed about its volume. The magnetism will interact with the earth ! s magnetic field producing a torque about the center of gravity of the satellite. If this torque is large, it can misalign the satellite and cause it to oscillate in its orbit. Prior to launch the magnetic field from the permanent magnetism can be measured and analyzed to determine how much torque will be produced by an external magnetic field. Ideally there exists some dipole moment called the effective or resultant dipole moment of the satellite, which produces an equivalent interaction with respect to torque in the earth f s magnetic field. This paper contains a general discussion of the process for defining the effective dipole moment of a satellite. Illustrations are included to clarify the discussion. A description is given of the coil facility in which the magnetic testing is accomplished and of the method for measuring the magnetic field of the satellite. Parameters that affect the measurements are described, e.g., the effect of instrument sensitivity and distance of measurement on the smallest measurable dipole moment. Basic analysis procedures are discussed, and possible methods for improving and extending the procedures are given. Computer generated curves are included as examples of typical measurement data. No attempt is made in this paper to provide thorough mathematical details although mention is made of harmonic analysis techniques and methods of least squares approximation. The purpose herein is to survey the general procedures for measuring and analyzing the magnetism of satellites

Structural modeling of aircraft tires

A theoretical and experimental investigation of the feasibility of determining the mechanical properties of aircraft tires from small-scale model tires was accomplished. The theoretical results indicate that the macroscopic static and dynamic mechanical properties of aircraft tires can be accurately determined from the scale model tires although the microscopic and thermal properties of aircraft tires can not. The experimental investigation was conducted on a scale model of a 40 x 12, 14 ply rated, type 7 aircraft tire with a scaling factor of 8.65. The experimental results indicate that the scale model tire exhibited the same static mechanical properties as the prototype tire when compared on a dimensionless basis. The structural modeling concept discussed in this report is believed to be exact for mechanical properties of aircraft tires under static, rolling, and transient conditions

Mars mission solar array Semiannual progress report, period ending 31 Dec. 1969

Design and testing of beryllium-structure solar panel for Mars missio

Human–Black Bear Conflicts: A Review of Common Management Practices

The objective of this monograph is to provide wildlife professionals, who respond to human–bear conflicts, with an appraisal of the most common techniques used for mitigating conflicts as well as the benefits and challenges of each technique in a single document. Most human–black bear conflict occurs when people make anthropogenic foods like garbage, dog food, domestic poultry, or fruit trees available to bears. Bears change their behavior to take advantage of these resources and may damage property or cause public safety concerns in the process. Managers and the public need to understand the available tools to stop human–bear conflict and reduce effects on bear populations.https://digitalcommons.usu.edu/hwi_monographs/1002/thumbnail.jp

Level-1 Regional Calorimeter Trigger System for CMS

The Compact Muon Solenoid (CMS) calorimeter regional trigger system is designed to detect signatures of isolated and non-isolated electrons/photons, jets, ?-leptons, and missing and total transverse energy using a deadtimeless pipelined architecture. This system contains 18 crates of custom-built electronics. The pre-production prototype backplane, boards, links and Application-Specific Integrated Circuits (ASICs) have been built and their performance is characterized.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 6 pages, PDF. PSN THHT00

An explanation of five thesis paintings

In this portion of my thesis I am attempting to speak objectively about five of my paintings: Self-Portrait with Rain Hat, Figures Three, Man at Table, Two Nudes, and Composition Jimmy. An explanation of the technical processes of the figure paintings is my primary concern. I have intentionally evaded a discussion of the purpose of my paintings because as a young painter I have not crystalized a philosophy of art. Each work originated in a different manner and evolved to a finished product representing a solution to a problem in creativity. Two media, oil and acrylic polymer paint, were used to portray these figures. Presented in chronological order the painter intends to show growth through five examples of artistic endeavor spanning a one-year study. The thesis includes an introduction, an account of the technical approach to the above mentioned paintings, and a catalogue of works in the exhibit accompanied by color slides

Basic considerations on seasonal breeding in mammals including their testing by comparing natural habitats and zoos

Seasonal reproduction is common in mammals. Whereas specific conditions triggering a seasonal response can only be identified in controlled experiments, large-scale comparisons of reproduction in natural habitats and zoos can advance knowledge for taxa unavailable for experimentation. We outline how such a comparison can identify species whose seasonal physiology is linked to photoperiodic triggers, and those whose perceived seasonality in the wild is the consequence of fluctuating resources without a photoperiodic trigger. This concept groups species into those that do not change their aseasonal pattern between natural habitats and zoos because they are not constrained by resources in the wild, those that do not change a seasonal pattern between natural habitats and zoos because they are triggered by photoperiod irrespective of resources, and those that change from a more seasonal pattern in the natural habitat to an aseasonal pattern in zoos because the zoo environment alleviates resource limitations experienced in the wild. We explain how detailed comparisons of mating season timing in both environments can provide clues whether a specific daylength or a specific number of days after an equinox or solstice is the likely phototrigger for a taxon. We outline relationships between life history strategies and seasonality, with special focus on relative shortening of gestation periods in more seasonal mammals. Irrespective of whether such shortening results from the adaptive value of fitting a reproductive cycle within one seasonal cycle (minimizing ‘lost opportunity’), or from benefits deriving from separating birth and mating (to optimize resource use, or to reduce infanticide), reproductive seasonality may emerge as a relevant driver of life history acceleration. Comparisons of data from natural habitats and zoos will facilitate testing some of the resulting hypotheses