The dynamics of nuclear reactions

The dynamics of nuclear reactions are surveyed on an elemental basis with emphasis upon the c.g. system of coordinate axes. Corrections are given for angular distributions, angular straggling, and thin target straggling.     

Prediction of maximum oxygen consumption from walking, jogging, or running

The purpose of this study was to develop a submaximal, 1.5-mile endurance test for college-aged students using walking, jogging, or running exercise. College students (N = 101: 52 men, 47 women), ages 18-26years, successfully completed the 1.5-mile test twice, and a maximal graded exercise test. Participants were instructed to achieve a "somewhat hard" exercise intensity (rating of perceived exertion = 13) and maintain a steady pace throughout each 1.5-mile test. Multiple linear regression generated the following prediction equation: VO2 max = 65.404 + 7.707 x gender (1 = male; 0 =female) - 0.159 x body mass (kg) - 0.843 x elapsed exercise time (min; walking, jogging orrunning). This equation shows acceptable validity (R = .86, SEE = 3.37 ml x kg(-1) min(-1)) similar to the accuracy of comparable field tests, and reliability (ICC = .93) is also comparable to similar models. The statistical shrinkage is minimal (R(press) = 0.85, SEE(press) = 3.51 ml x kg(-) x min(-1)); hence, it should provide comparable results when applied to other similar samples. A regression model (R =.90, and SEE = 2.87 ml x kg(-1) min(-1)) including exercise heart rate was also developed: VO2 max = 100.162 +/- 7.301 x gender(1 = male; 0 =female) - 0.164 x body mass (kg) - 1.273 x elapsed exercise time -0.156 x exercise heart rate, for those who have access to electronic heart rate monitors. This submaximal 1.5-mile test accurately predicts maximal oxygen uptake (VO2max) without measuring heart rate and is similar to the 1.5-mile run in that it allowsfor mass testing and requires only a flat, measured distance and a stopwatch. Further, it can accommodate a wide range of fitness levels (from walkers to runners).     

Motorische Leistungsfähigkeit von Kindern und Jugendlichen in Deutschland

Motor performance is an important health resource. Review articles revealed a decline of motor performance of approximately 10?% between 1975 and 2006. In the past most of the data available for such comparisons came from ad hoc studies with non-standardized methods. Within the framework of the ”Motorik-Modul“ (MoMo) study as part of the German Health Interview and Examination Survey for Children and Adolescents (KiGGS), it is possible for the first time to directly compare two cohorts in the ages of 4–17 years in a nationally representative database for Germany. The aim of this article is to report changes in motor performance of children and adolescents in the time period 2003–2006 (cohort baseline n = 4528) compared to 2009–2012 (cohort wave 1, n = 2820). Overall, it is clearly shown that the motor performance of children and adolescents in Germany did not decrease within the observational period of 6 years. The comparison of mean values of the baseline cohort compared to those of wave 1 showed that 28 out of 52 mean values of the two cohorts with a high probability did not differ based on 95?% confidence intervals (CI). In 24 out of the 52 mean values positive changes could be noted based on the individual 95?% CI values. There were more positive changes in primary school aged children than in other age groups. Within these positive changes, most effect sizes were small to medium. The results indicate that recent activities aiming at elevating motor performance levels may have started to make an impact and should be expanded, also in secondary schools. The comparative cohort study presented in this article is currently being checked by the ongoing MoMo wave 2 survey of 2014–2017.     

Understanding others Kellyian theory,methodology and applicationComprendre les autres la théorie de Kelly: methodologie et applicationEntendimiemto de los otros la teoría de Kelly: metodología y applicación

This article discusses Kelly's theory of personal constructs and its Repertory grid technique as means of revealing the nature of cultural differences and similarities. It shows how Kelly's theory relates to cognitive theory, implicit personality theory and subjective culture theory. According to Kelly, people and groups are best understood in terms of the ways they anticipate events. People are all psychologists since they employ constructs. These bases of discrimination are bipolar in nature and open to revision. A group's culture is summarized by its members' shared superordinate constructs. Kelly's Commonality Corollary explains that members of a group are similar because they use the same constructs to order events. Kelly's Sociality Corollary states that, in order to enter into a relationship with others, people need first to subsume the others' personal constructs. His custom-built Repertory grid elicits constructs by having a person decide how in a matrix other people, for example, are similar and different. In the rated grid form, each person or element is rated from most to least on the positive pole of each construct. Either principal components or cluster analysis or multidimensional scaling can reveal the interviewed person's superordinate dimensions of appraisal. As an emic technique, the grid is contrasted with the semantic differential and other fixed-format tests. A review of the personal construct literature shows that many individuals and cultural groups have been explained in their own terms. In this research, difference is construed as interesting and others are understood by construing their construction processes as a first step towards approval.     

Effects of uncontrollability and failure on the development of learned helplessness in perceptual-motor tasks

The aim of this study was to distinguish between the roles of uncontrollability and failure on learned helplessness in a perceptual-motor task. Forty-eight junior high school students were randomly assigned in a 2 x 2 (Controllability: Contingent vs. Yoked Noncontingent Feedback x Type of Outcome: Success vs. Failure) factorial design to complete a gun-shooting task on a moving target using a computer screen. Twelve other participants (control group) simply read a passage. After filling out causal attribution and self-efficacy expectations questionnaires, all participants carried out another gun-shooting task (test task). Results showed that contingency led to higher performances than noncontingency. Success conditions elicited higher self-efficacy expectations than failure conditions. Failure entailed less persistence than success did for participants who had been assigned to the contingency condition. Internalization of failure was negatively correlated with persistence. Comparisons with the control group showed that expectations and performance deficits of learned helplessness were provoked by failure in noncontingent situations; persistence deficits were due to failure in contingent situations. These results reveal that both uncontrollability and failure can be responsible for different forms of learned helplessness.