Random harmonic analysis program, L221 (TEV156). Volume 1: Engineering and usage

A digital computer program capable of calculating steady state solutions for linear second order differential equations due to sinusoidal forcing functions is described. The field of application of the program, the analysis of airplane response and loads due to continuous random air turbulence, is discussed. Optional capabilities including frequency dependent input matrices, feedback damping, gradual gust penetration, multiple excitation forcing functions, and a static elastic solution are described. Program usage and a description of the analysis used are presented

Random harmonic analysis program, L221 (TEV156). Volume 2: Supplemental system design and maintenenace document

Volume 2 of a two volume document is presented. A computer program, L222 (TEV 156), available for execution on the CDC 6600 computer is described. The program is capable of calculating steady-state solutions for linear second-order differential equations due to sinusoidal forcing functions. From this, steady-state solutions, generalized coordinates, and load frequency responses may be determined. Statistical characteristics of loads for the forcing function spectral shape may also be calculated using random harmonic analysis techniques. The particular field of application of the program is the analysis of airplane response and loads due to continuous random air turbulence

Combating the 'Sick Building Syndrome' by Improving Indoor Air Quality

Research indicates that many of symptoms attributed to the Sick Building Syndrome in air-conditioned office buildings are a result of considerably reduced negative ions in the internal atmosphere and that replacing the depleted negative ions can improve indoor air quality. This paper describes a method used to develop a formula (DOF-NIL formula) for calculating the amount of negative ions to be added to air-conditioned buildings, to improve air quality. The formula enables estimates to be made based on how negative ions in the air are reduced by three main factors namely, Video Display Terminals (VDT); heating, ventilation and air conditioning (HVAC) and Building Contents (BC). Calculations for a typical air-conditioned office, are compared with an Air Ion Counter instrument. The results show that the formula, when applied to a typical air-conditioned office, provides an accurate estimate for design purposes. The typical rate of additional negative-ions (ion-generating) for a negative ion condition is found to be approximately 12.0 billion ions/hr for at least 4 hour ion-generating

Autonomic physiological data associated with simulator discomfort

The development of a physiological monitoring capability for the Army's advanced helicopter simulator facility is reported. Additionally, preliminary physiological data is presented. Our objective was to demonstrate the sensitivity of physiological measures in this simulator to self-reported simulator sickness. The data suggested that heart period, hypergastria, and skin conductance level were more sensitive to simulator sickness than were vagal tone and normal electrogastric activity

Breaking Through the Noise: Literacy Teachers in the Face of Accountability, Evaluation, and Reform

In an era of increased accountability, it is important to understand how exemplary teachers navigate the demands placed on them by their schools, districts, and states in order to support student learning aligned with their beliefs of effective instruction. To understand these negotiations, tensions facing exemplary literacy teachers were examined through a qualitative interview study. Participants included nineteen experienced PK-6th grade teachers from across the U.S. Results of the study indicate that teachers experience discrepancies between their beliefs and state and local mandates, and they discuss a variety of strategies for negotiating these discrepancies. Findings suggest that schools can support effective literacy instruction by cultivating cultures of autonomy for teachers and strengthening teachers’ sense of agency

Innovation Performance and Its Impact on Profitability Among Different Sectors in the Australian Construction Industry

The BRITE (Building Research Information Technology and Environment) project was established by the Australian Cooperative Research Centre for Construction Innovation to encourage innovation in the construction industry. While innovation is generally perceived to be broadly beneficial, there has been little formal study of its occurrence or impact in Australian construction or of the factors which foster an innovative atmosphere within an enterprise. In order to benchmark innovation performance, the BRITE project conducted a survey in 2004 into the nature, incidence and variety of technological and organisational innovations in various sectors of the industry. With some exceptions, the survey found that clients and consultants engaged in significantly higher levels of innovation than did suppliers, main contractors or trade contractors. Within the industry sectors those organisations classified as high innovators favoured the adoption of advanced management practices and had formal evaluation systems in place to judge their progress. They reported significant positive impacts on their profitability from innovation and can therefore provide instructive examples for the rest of the industry to follow