Small Fixed-wing Aerial Positioning Using Inter-vehicle Ranging Combined with Visual Odometry

There has been increasing interest in developing the ability for small unmanned aerial systems (SUAS) to be able to operate in environments where GPS is not available. This research considers the case of a larger aircraft loitering above a smaller GPS-denied SUAS. This larger aircraft is assumed to have greater resources which can overcome the GPS jamming and provide range information to the SUAS flying a mission below. This research demonstrates that using a ranging update combined with an aircraft motion model and visual odometry can greatly improve the accuracy of a SUASs estimated position in a GPS-denied environment

Redundant actuator development program

Two concepts of redundant secondary actuator mechanization, applicable to future advanced flight control systems, were studied to quantitatively assess their design applicability to an AST. The two actuator concepts, a four-channel, force summed system and a three-channel, active/standby system have been developed and evaluated through analysis, analog computer simulation, and piloted motion simulation. The quantitative comparison of the two concepts indicates that the force summed concept better meet performance requirements, although the active/standby is superior in other respects. Both concepts are viable candidates for advanced control application dependent on the specific performance requirements

Design, development and fabrication of a Precision Autocollimating Solar Sensor /PASS/

Precision Autocollimating Solar Sensor /PASS/ for Solar Pointing Aerobee Rocket Control System /SPARCS/ progra

Production of superconductor/carbon bicomponent fibers

Certain materials are unable to be drawn or spun into fiber form due to their improper melting characteristics or brittleness. However, fibrous samples of such materials are often necessary for the fabrication of intricate shapes and composites. In response to this problem, a unique process, referred to as the piggyback process, was developed to prepare fibrous samples of a variety of nonspinnable ceramics. In this technique, specially produced C-shaped carbon fibers serve as micromolds to hold the desired materials prior to sintering. Depending on the sintering atmosphere used, bicomponent or single component fibers result. While much has been demonstrated worldwide concerning the YBa2Cu3O(7-x) superconductor, fabrication into unique forms has proven quite difficult. However, a variety of intricate shapes are necessary for rapid commercialization of the superconducting materials. The potential for producing fibrous samples of the YBa2Cu3O(7-x) compound by the piggyback process is being investigated. Various organic and acrylic materials were investigated to determine suspending ability, reactivity with the YBa2Cu3O(7-x) compound during long term storage, and burn out characteristics. While many questions were answered with respect to the interfacial reactions between YBa2Cu3O(7-x) and carbon, much work is still necessary to improve the quality of the sintered material if the fibers produced are to be incorporated into useful composites or cables. Additional research is necessary to evaluate quality of the barrier layer during long soakings at the peak temperature; adjust the firing schedule to avoid microcracking and improve densification; and increase the solids loading in the superconductive suspension to decrease porosity

The Clothing Swap: Social, Sustainable, and Sacred

While there is much focus on recycling household waste such as paper, plastic, and metal, there is less focused attention on the waste produced by clothing and textiles. As noted by Joung (2013), consumers dispose of clothes by recycling, donating to charities, or giving to friends and family. But when individuals are not motivated to do this or are unaware of recycling options, they simply discard unwanted clothing where it ends up in landfill sites. Motives for recycling clothes can range from altruistic (e.g., donating to a clothing drive for the poor or victims of a natural disaster) to economic (e.g., selling clothes online, at a consignment shop or donating to obtain a tax deduction). Yet other individuals might be motivated by concern for the environment. Patagonia, an outdoor clothing retailer, appeals to this motivation with its reuse and recycling initiatives. Consumers are encouraged to send in their worn out Patagonia clothing for repurposing or recycling and to buy used Patagonia clothes. In an unusual twist, Patagonia’s Black Friday advertisement in the New York Times in 2012 proclaimed “Don’t buy this jacket” with an explanation of the natural resources and environmental costs of manufacturing one of their jackets (Patagonia 2015)

Three-dimensional harmonic oscillator and time evolution in quantum mechanics

The problem of defining time (or phase) operator for three-dimensional harmonic oscillator has been analyzed. A new formula for this operator has been derived. The results have been used to demonstrate a possibility of representing quantum-mechanical time evolution in the framework of an extended Hilbert space structure. Physical interpretation of the extended structure has been discussed shortly, too.Comment: 14 pages; submitted to Phys Rev

Conformations of closed DNA

We examine the conformations of a model for a short segment of closed DNA. The molecule is represented as a cylindrically symmetric elastic rod with a constraint corresponding to a specification of the linking number. We obtain analytic expressions leading to the spatial configuration of a family of solutions representing distortions that interpolate between the circular form of DNA and a figure-eight form that represents the onset of interwinding. We are also able to generate knotted loops. We suggest ways to use our approach to produce other configurations relevant to studies of DNA structure. The stability of the distorted configurations is assessed, along with the effects of fluctuations on the free energy of the various configurations.Comment: 39 pages in REVTEX with 14 eps figures. Submitted to Phys. Rev. E. This manuscript updates, expands and revises, to a considerable extent, a previously posted manuscript, entitled "Conformations of Circular DNA," which appeared as cond-mat/970104

An Experimental Juvenile Probation Program: Effects on Parent and Peer Relationships

In an effort to provide a wider range of services to youth and their families than is traditionally available in routine probation, the South Oxnard Challenge Project (SOCP) employed a team approach to service delivery of an intensive probation program. The researchers interviewed juveniles who were randomly assigned to either the SOCP experimental condition or the control condition of a routine probation program. The intensive probation program, among other goals, focused on improving parent-child relationships and teaching youth how to choose better peers. At 1 year post random assignment, experimental and control youth were not significantly different on key family or peer relationship measures. Level of program intensity, implementation issues, and other problems inherent in doing this type of research are provided as possible explanations for the lack of differences. These null findings are examined in light of the recent movement toward parental involvement legislation

An Experimental Juvenile Probation Program: Effects on Parent and Peer Relationships

In an effort to provide a wider range of services to youth and their families than is traditionally available in routine probation, the South Oxnard Challenge Project (SOCP) employed a team approach to service delivery of an intensive probation program. The researchers interviewed juveniles who were randomly assigned to either the SOCP experimental condition or the control condition of a routine probation program. The intensive probation program, among other goals, focused on improving parent-child relationships and teaching youth how to choose better peers. At 1 year post random assignment, experimental and control youth were not significantly different on key family or peer relationship measures. Level of program intensity, implementation issues, and other problems inherent in doing this type of research are provided as possible explanations for the lack of differences. These null findings are examined in light of the recent movement toward parental involvement legislation