Flight experience with manually controlled unconventional aircraft motions

A modified YF-16 aircraft was used to flight demonstrate decoupled modes under the USAF Fighter Control Configured Vehicle (CCV) Program. The direct force capabilities were used to implement seven manually controlled unconventional modes on the aircraft, allowing flat turns, decoupled normal acceleration control, independent longitudinal and lateral translations, uncoupled elevation and azimuth aiming, and blended direct lift. This paper describes the design, development, and flight testing of these control modes. The need for task-tailored mode authorities, gain-scheduling and selected closed-loop design is discussed

Polar plasmas as observed by Dynamics Explorers 1 and 2

Plasma measurements from the Dynamics Explorer 1 and 2 satellites were used to characterize the polar cap environment. Analysis of numerous polar-cap passes indicate that, in general, three major regimes of plasma exist: (1) polar rain--electrons with magnetosheath-like energy spectra but much lower densities, most intense near the cusp and weakening toward the central polar cap; (2) polar wind--low energy upward flowing ions with both field-aligned and conical distributions; and (3) acceleration events--sporadic events consistent with the acceleration of electrons and positive ions by parallel electric fields. (1) to (3) were observed at high altitudes by Dynamics Explorer 1, while (1) and (3) were also observed at low altitudes by Dynamics Explorer 2. The plasma parameters associated with these plasma regimes are presented and discussed in terms of source and acceleration mechanisms

Simulation of the Sedimentology of Sediment Detention Basins

Sediment detention basins are a widely used means of controlling downstream sediment pollution resulting from stripmining and construction activities. A mathematical model for describing the sedimentation characteristics of detention basins has been developed. This model requires as inputs the inflow hydrograph, inflow sediment graph, sediment particle size distribution, detention basin stage-area relationship and detention basin stage-discharge relationship. Based on this information the model routes the water and sediment through the basin. In this routing process the outflow sediment concentration graph, the pattern of sediment deposition in the basin and the sediment trapping efficiency are estimated. Comparison of predicted results with measured sediment basin performance indicates the model accurately represents the sedimentation process in detention basins. This report details the model, illustrates its use in design, explains how to process the model on a digital computer and presents a program listing of the model

Groundwater Flow and Elastoplastic Stress-Strain Model for Cohesive Soils with Application to Channel Bank Stability

A saturated-unsaturated groundwater flow and elastoplastic stress-strain finite element model was developed for simulating the mechanical behavior of rill and gully sized channel banks. The model coupled the two-dimensional saturated-unsaturated groundwater flow equation with a plane strain formulation of the virtual work equation. The constitutive relationship used the modified Cam clay yield function. The model included the effects of seepage force and variation in soil cohesive strength due to changes in water content and void ratio. A staggered solution procedure was used in which the groundwater equation was solved first to determine seepage force and soil cohesive force, and then the stress-strain equation was solved. Upon reaching the failure point, the elastoplastic constitutive relationship was replaced with a weak elastic relationship. The model was verified by comparing predictions with (1) one-dimensional analytic solutions for unsaturated flow, saturated flow, and elastic strain; (2) other numerical solutions using the modified Cam clay yield function; (3) triaxial tests; and (4) laboratory experiments. The laboratory experiments employed a specially designed cyclic soil compactor and plexiglass flume to form and compact channel banks. The channel banks were subjected to a rising and falling hydrograph. Model simulation included groundwater movement into the channel bank, strain in the x-direction, and the location of finite elements which reached ultimate strength. Failure surfaces were delineated by zones of high x-strain in conjunction with finite elements which reached ultimate strength. The model provided good insight into the failure mechanism for popout failure and a reasonable prediction of plane failure

Development of Prediction Relationships for Water Requirements with Irrigation Cooling

A model for predicting leaf temperatures during an off-on mist cycle is presented. The model uses a combination of energy budget and aerodynamic techniques. The model was tested for dry leaf temperature and evapotranspiration predictions using average hourly data from Arizona. The accuracy was good. It was also tested for dry leaf temperature predictions using two to three minute data with a widely varying net radiation. When reasonable values of stomatal resistance were used, the agreement was again good. The model was tested for prediction of wet leaf temperature prediction with a ten minute on, fifty minute off mist irrigation cycle. The agreement was fair when using reasonable input parameters. The poorest predictions were during the mist on cycle

The Effect of Single-Leg Stance on Dancer and Control Group Static Balance

International Journal of Exercise Science 9(2): 110-120, 2016. The purpose of this study was to compare kinetic differences of static balance between female dancers (D) with at least seven years of dance experience and female non-dancers (ND) who were typical college students. Participants were tested in single-leg stance. Both the dominant leg (DL) and non-dominant leg (NDL) were tested with the participants shod (S) and barefoot (BF). Kinetic variables (vertical, medio-lateral [ML], antero-posterior [AP] maximum ground reaction forces (GRF), and center of pressure (COP) ML and AP) were measured by a Bertec force platform at 1000 Hz with participants S and BF. Each subject’s stance was measured over 3 x 30-second intervals. No significant differences (p≥0.05) existed between groups for height, body mass, or age. Significant differences existed between groups for balance time, AP GRF in both BF and S conditions for both DL and NDL, and ML GRF in BF NDL and S DL and NDL conditions. D and ND in BF and S conditions with DL and NDL static stance demonstrate different AP and ML GRF when balancing over a 30-second time interval. Data may suggest that ND are more prone to lose their balance. Further investigation is warranted to understand whether individuals in the rehabilitative field and athletic populations can use dance therapy for injury prevention and rehabilitation

Sonically-enhanced widgets: comments on Brewster and Clarke, ICAD 1997

This paper presents a review of the research surrounding the paper “The Design and Evaluation of a Sonically Enhanced Tool Palette” by Brewster and Clarke from ICAD 1997. A historical perspective is given followed by a discussion of how this work has fed into current developments in the area

Geodemographic approaches to identifying U.S. furniture markets

Demand for household furniture is shaped by a multitude of dynamic forces, from the global economic situation to subtle changes in consumer preferences. Correspondingly, the academic disciplines employed to identify, analyze, and predict these forces range from macroeconomics to psychology, and include demography, sociology, geography, and several applied fields. The demographic characteristics of furniture consumers has been a particularly popular area of research, primarily because of the availability of secondary data from various public · agencies. Some of this research is reviewed in a subsequent section of this report

Providing a Safe Harbor for Those Who Play by the Rules: The Case for a Strong Regulatory Compliance Defense

On September 25, 2003, a fire broke out at the National Health Care (NHC) nursing home facility in Nashville, Tennessee, causing sixteen deaths and a number of injuries from smoke inhalation. Thirty-two victims subsequently filed suit against the nursing home, alleging that NHC was negligent for failing to install sprinklers in its facility. This claim was made notwithstanding the fact that applicable federal, state, and local safety regulations did not require the installation of sprinklers in this particular type of building, and notwithstanding that the NHC facility had been inspected by state fire inspectors just months before the fire and was found to be in compliance with all requirements of the fire code. NHC eventually settled these lawsuits in order to avoid the uncertainty and expense of further litigation. The NHC case illustrates how good-faith compliance with applicable safety regulations provides businesses with almost no protection against potentially devastating tort liability. The problem is with the legal rule that governs compliance with government regulations. In effect, most courts treat a defendant\u27s compliance with governmental regulations as evidence of due care, but allow the jury to find that a defendant was negligent, notwithstanding his or her compliance with legislative or administrative regulations. We shall refer to this as the traditional approach to regulatory compliance. The traditional approach originated in Grand Trunk Railway Co. of Canada v. Ives, decided by the United States Supreme Court in the late nineteenth century. Later, § 288C of the Second Restatement of Torts endorsed this version of the rule, declaring that compliance with safety regulations was not conclusive evidence that a defendant exercised due care. The American Law Institute is currently in the process of drafting the Third Restatement of Torts, and the revised version of the regulatory compliance defense is substantially similar to that of the Second Restatement. In our view, there are many problems with the traditional approach. First, legislatures and administrative agencies have more expertise than lay juries when it comes to determining efficient levels of safety, but the traditional approach allows lay juries to second guess them. Second, under our constitutional system, legislative bodies and administrative agencies, not courts, are responsible for making resource allocation and other policy decisions. Therefore, courts should accept the trade-offs that are often embodied in safety regulations instead of allowing plaintiffs to use the litigation process to substitute their own policy choices for those of legislative bodies and administrative agencies. Third, the traditional approach wrongly assumes that government safety regulations merely set minimum standards, while, in reality, modem regulations typically reflect state-of-the-art standards. Thus, by adding jury-created safety standards on top of existing regulatory requirements, the traditional approach to regulatory compliance adds to the cost of doing business without achieving significant safety gains. Fourth, the traditional approach to regulatory compliance undermines the principle of uniform application of regulatory standards. Because jury verdicts are seldom consistent, business entities are often subjected to nonuniform safety standards. Finally, the traditional approach deters useful economic activity by imposing potentially crushing tort liability upon those who have complied in good faith with regulatory standards. Part II of this Article examines the traditional approach to the regulatory compliance defense, beginning with the Supreme Court\u27s opinion in Grand Trunk Railway Co. of Canada v. Ives, and proceeding to the Restatement (Second) § 288C and the Restatement (Third) of Torts: Liability for Physical Harm § 16. In Part III, we discuss a number of cases that explicitly recognize a strong regulatory compliance defense, as well as cases that achieve a similar objective by expressly or impliedly applying the Second Restatement\u27s § 16, comment (a) exception. Part IV reviews some of the arguments that support a stronger regulatory compliance defense. These include: (1) the institutional competence argument, (2) the separation of powers argument, (3) the regulatory efficiency argument, (4) the nonuniform standards argument, and (5) the overdeterrence argument. In Part V, we focus on nursing home regulation to -see what impact a stronger regulatory compliance defense would have on this socially useful industry. Finally, in Part VI, we set forth a proposed alternative to the current version of Restatement (Third) of Torts: Liability for Physical Harm § 16