Comparison of the Matthews Youth Test for Health and the Hunter-Wolf A-B Rating Scale: measures of type A behavior in children

This study evaluated the extent to which two youth measures of Type A behavior--the Matthews Youth Test for Health (MYTH) and the Hunter-Wolf A-B Rating Scale--similarly assess the Type A construct. Data from 25 elementary teachers and from 300 of their students revealed that these scales are weakly correlated and that the concordance of their Type A-Type B classifications was only slightly above that expected by chance. Weak agreement was found even when teachers and students rated the same Type A behaviors, which suggests that variability in content was not the principal reason for the lack of agreement between these measures. The major implication of this study is that the MYTH and the Hunter-Wolf scale should not be considered interchangeable measures of Type A behavior. The study reveals that investigators' choice of a Type A measure may strongly affect the nature of their research findings and may inhibit the integration of their data with data from other investigators who employ different measures of the Type A construct. It is recommended that, if multiple measures cannot be used in a study, the investigator employ the MYTH.     

Multiple liquid impact of single-crystal lithium fluoride

Lithium fluoride in its single-crystal form is an interesting material for investigating the development of fracture by multiple liquid impact owing to its well characterized crystal structure. The development of fracture during liquid impact is attributed to the extension of short circumferential cracks produced around the loaded area by the passing Rayleigh stress wave after the impact event. The damage threshold of single-crystal lithium fluoride is developed using the Cavendish Laboratory's multiple impact jet apparatus as a result of identifying the characteristic fracture annulus associated with liquid impact during a controlled experimental procedure. The observation of damage produced in solids by liquid impact has practical significance in the problems with supersonic aircraft flying through rain and in the erosion of turbine blades moving at high speeds through wet steam.     

Matching temporal frame to recipients' time orientation in exercise messaging: Does argument quality matter?

ObjectivesIn this study, the extent to which argument quality impacts upon tailoring effects in exercise messages is explored.Design2 (Strong versus Weak) × 2 (Tailored versus Not Tailored) Experimental Design.Method127 young adults (Mage = 20.70, SD = 3.06) received either strong or weak messages about a new exercise class that were tailored to be congruent or incongruent with their chronic time-orientation.ResultsNo main effects for message tailoring were found, but a significant interaction between argument quality and message tailoring emerged for two dependent variables: instrumental attitudes and willingness to recommend the class to a friend. Under tailored conditions, scores for both dependent variables were significantly higher for those who received a strong argument than for those who received a weak argument, whereas there was no difference between those who viewed a strong and a weak argument in the non-tailored conditions.ConclusionsThe study corroborates findings from other research that tailored messages are most likely to be consequential under conditions of strong argument quality.