Solar residential heating and cooling system

System has been placed in operation to verify technical feasibility of using solar energy to provide residential heating and cooling. Complete system analysis was performed to provide design information

Solar residential heating and cooling system development test program

A solar heating and cooling system is described, which was installed in a simulated home at Marshall Space Flight Center. Performance data are provided for the checkout and initial operational phase for key subsystems and for the total system. Valuable information was obtained with regard to operation of a solar cooling system during the first summer of operation. Areas where improvements and modifications are required to optimize such a system are discussed

Temperature Coefficient of the Modulus of Rigidity of Aircraft Instrument Diaphragm and Spring Materials

Experimental data are presented on the variation of the modulus of rigidity in the temperature range -20 to +50 degrees C. of a number of metals which are of possible use for elastic elements for aircraft and other instruments. The methods of the torsional pendulum was used to determine the modulus of rigidity and its temperature coefficient for aluminum, duralumin, monel metal, brass, phosphor bronze, coin silver, nickel silver, three high carbon steels, and three alloy steels. It was observed that tensile stress affected the values of the modulus by amounts of 1 per cent or less

A Qualitative Study of Stressors, Stress Symptoms, and Coping Mechanisms Among College Students Using Nominal Group Process

Background: Stress is part of the college experience; however, how students deal with stress can greatly impact their behaviors and health status. Purpose: The purpose of this study was to qualitatively assess sources of stress, types of stressors, and coping mechanisms employed among undergraduate students. Methods: Nominal group process was utilized to obtain information related to study variables and help prioritize the accounts provided by study participants (n = 173). Results: Participants gave insight into the unique stress faced by this generation (grades, GPA, multitasking, parental expectations), stress symptoms (more psychological in nature), and coping strategies (prayer, talking to mom, surfing the net, and social networking). The top stressors included: schoolwork, money, time management, parents, and friends. Moodiness/irritability, anxiety, and sleep problems were the highest-ranked symptoms of stress cited by study participants. The three most-reported coping mechanisms were: working out, prayer, and talking to mom. Conclusions: Although the themes of stressors, symptoms, and coping mechanisms for college students might not have changed through the years, the sources that underlie these themes have changed as compared to past generations

Achievement and Satisfaction in Blended Learning versus Traditional General Health Course Designs

Blended learning is a hybrid of classroom and on-line learning that includes some of the conveniences of on-line courses without the complete loss of face-to-face tact. Purpose: The purpose of this study was to evaluate student achievement and satisfaction with blended learning course delivery compared to a traditional face-to-face class format in a general health course. Method: Surveys were distributed to randomly selected classes during the fall 2007 semester: three blended and one traditional sections participated (n=251). Results: Total satisfaction scores between blended (54.986) and traditional (49.788) classes were significantly different (p\u3c 0.01). Achievement by students of blended and traditional sections brought mixed findings, yet blended students’ overall grades were significantly higher (p=0.048). Conclusion: Results indicated that a blended course delivery is preferred over a traditional lecture format, and promising data emerged to challenge teachers’ traditional approach to teaching general health courses at the university level

IMPUTING CHARACTERISTIC VALUES OF AGRICULTURAL SEED-STOCK

Statistical methods of regression and mathematical (linear) programming are employed to combine principles of economics and genetics in a conceptual, multi-step, model of valuation for biotechnical change. The resulting model has the capacity to estimate the value of changes in specific characteristics for specific production environments, whether those changes are accomplished by traditional plant and animal breeding methods or by genetic engineering. The application of the model is illustrated with an example of commercial cow-calf production under conditions typical of the Texas Panhandle using a total of 32 breed groups

The nature of disciplines and the conduct of interdisciplinary inquiry

Includes bibliographical references