Induced radionuclides in astronauts Second quarterly activity report, 1 Oct. 1967 - 1 Jan. 1968

Tissue irradiated with protons and thermal/fast neutrons to study induced radioactive isotope production in astronaut

The effect of delta 3 on a yawing HAWT blade and on yaw dynamics

A single degree of freedom aeroelastic computer model, WMSTAB3, was employed to perform a parametric analysis of HAWT blade behavior during yaw maneuvers. Over 1,000 different combinations of delta sub 3 and normal frequency were analyzed. The effect of delta sub 3 and flapping stiffness on flapping frequency, phase, and magnitude are discussed. The moments transmitted to the fixed system during yaw maneuvers were calculated and reduced to time constants of response to step changes in wind direction. The significance of the time constants for the configurations considered relative to yaw response rate and lag angle is discussed, along with their possible significance for large HAWT

WHERE WILL FUTURE AGRICULTURAL MARKETING INFORMATION COME FROM: NEW JERSEY PEACH MARKET - A CASE STUDY

Researchers and decision makers are currently faced with a reduced supply of agricultural marketing information at both federal and state levels. Although a number of on-line computer informational sources are available to help fill this gap, the data are relatively expensive and often not available in the form or detail needed at the farm level. This paper examines expected future sources of agricultural information in the public, private and semi-public/private sectors. A working model of a semi-public/private informational system is presented. The proposed self-help grower informational model system can be tailored to provide farm level data needed at a reasonable cost.Resource /Energy Economics and Policy,

Chemistry vs. Physics: A Comparison of How Biology Majors View Each Discipline

A student's beliefs about science and learning science may be more or less sophisticated depending on the specific science discipline. In this study, we used the physics and chemistry versions of the Colorado Learning Attitudes about Science Survey (CLASS) to measure student beliefs in the large, introductory physics and chemistry courses, respectively. We compare how biology majors -- generally required to take both of the courses -- view these two disciplines. We find that these students' beliefs are more sophisticated about physics (more like the experts in that discipline) than they are about chemistry. At the start of the term, the average % Overall Favorable score on the CLASS is 59% in physics and 53% in chemistry. The students' responses are statistically more expert-like in physics than in chemistry on 10 statements (P lesser-than-or-equal-to 0.01), indicating that these students think chemistry is more about memorizing disconnected pieces of information and sample problems, and has less to do with the real world. In addition, these students' view of chemistry degraded over the course of the term. Their favorable scores shifted -5.7% and -13.5% in 'Overall' and the 'Real World Connection' category, respectively; in the physics course, which used a variety of research-based teaching practices, these scores shifted 0.0% and +0.3%, respectively. The chemistry shifts are comparable to those previously observed in traditional introductory physics courses