Optical projector system Patent

Optical projector system for establishing optimum arrangement of instrument displays in aircraft, spacecraft, other vehicles, and industrial instrument console

Visual attitude orientation and alignment system

Active vehicle optical alignment aid and a passive vehicle three-dimensional alignment target ensure proper orientation and alignment plus control of the closure range and rate between two bodies, one in controlled motion and one at rest

Alternating direction implicit methods for parabolic equations with a mixed derivative

Alternating direction implicit (ADI) schemes for two-dimensional parabolic equations with a mixed derivative are constructed by using the class of all A sub 0-stable linear two-step methods in conjunction with the method of approximation factorization. The mixed derivative is treated with an explicit two-step method which is compatible with an implicit A sub 0-stable method. The parameter space for which the resulting ADI schemes are second order accurate and unconditionally stable is determined. Some numerical examples are given

Numerical calculations of two dimensional, unsteady transonic flows with circulation

The feasibility of obtaining two-dimensional, unsteady transonic aerodynamic data by numerically integrating the Euler equations is investigated. An explicit, third-order-accurate, noncentered, finite-difference scheme is used to compute unsteady flows about airfoils. Solutions for lifting and nonlifting airfoils are presented and compared with subsonic linear theory. The applicability and efficiency of the numerical indicial function method are outlined. Numerically computed subsonic and transonic oscillatory aerodynamic coefficients are presented and compared with those obtained from subsonic linear theory and transonic wind-tunnel data

An extension of A-stability to alternating direction implicit methods

An alternating direction implicit (ADI) scheme was constructed by the method of approximate factorization. An A-stable linear multistep method (LMM) was used to integrate a model two-dimensional hyperbolic-parabolic partial differential equation. Sufficient conditions for the A-stability of the LMM were determined by applying the theory of positive real functions to reduce the stability analysis of the partial differential equations to a simple algebraic test. A linear test equation for partial differential equations is defined and then used to analyze the stability of approximate factorization schemes. An ADI method for the three-dimensional heat equation is also presented

Metal tube used as solar engine

Ends of metal tube are fastened to axles which are supported on bearings so tube can rotate about its long axis while subjected to invariant bending moment that stresses it along longitudinal axis of rotation. Heat absorbed leads to expansion of metal, which unbalances internal forces and generates rotational moment in tube

Solid medium thermal engine

A device is described which uses a single phase metallic working substance to convert thermal energy directly into mechanical energy. The device consists of a cylindrical metal tube which is free to rotate about its axis while being subjected to continuous bending moment stresses along the longitudinal axis of rotation. The stressing causes portions of the tube to be under compression while other parts are under tension which in turn causes the tube to rotate and provide mechanical energy

Optical projectors simulate human eyes to establish operator's field of view

Device projects visual pattern limits of the field of view of an operator as his eyes are directed at a given point on a control panel. The device, which consists of two projectors, provides instant evaluation of visual ability at a point on a panel

Prince Farming Takes a Wife: Exploring the Use of Agricultural Imagery and Stereotypes on ABC\u27s The Bachelor

The 19th season of ABC’s The Bachelor stars Chris Soules, an Iowa farmer who is pursuing a wife. Soules appears to exhibit all the qualities of a gentleman farmer desired by the contestants: good looks, kindness, strong family values, and courteous manners. However, research of previous reality television programs has concluded negative views of agricultural lifestyles typically are present. The Bachelor aired during prime-time television hours and exposed millions of viewers to agricultural imagery, which is why an analysis of this season is important to agricultural communicators. This qualitative discourse analysis examines the representation of agriculture and rural communities through selected videos and episodes of The Bachelor that show Soules and the bachelorettes in agriculture-related settings. Previous research indicates entertainment media have impacted audience’s perceptions of agriculture and reality television programming is adept at perpetuating stereotypes. Repeated exposure to stereotypes through media representation causes viewers to absorb those images into their social reality and, in turn, impacts their beliefs, attitudes, and behaviors toward the subject of those stereotypes. The Bachelor Season 19 contains both positive and negative agricultural stereotypes, including isolated small-town life, hard-working farmers, and “country” as a personality type. Farm-centric content is used to elicit laughs and to build romantic tension with the effect of minimizing the importance of agriculture. The researchers plan further investigation of the perceptual effects of the program’s televised content and the related social-media conversation surrounding “Prince Farming.

Boundary Approximations for Implicit Schemes for .One-Dimensional Inviscid Equations of Gasdynamics

The applicability to practical calculations of recent theoretical developments in the stability analysis of difference approximations is examined for initial boundary-value problems of the hyperbolic type. For the numerical experiments the one-dimensional inviscid gasdynamic equations in conservation law form are selected. A class of implicit schemes based on linear multistep methods for ordinary differential equations is chosen and the use of space or space-time extrapolations as implicit or explicit boundary schemes is emphasized. Some numerical examples with various inflow-outflow conditions highlight the commonly discussed issues: explicit vs implicit boundary schemes, and unconditionally stable schemes