The proportionalities method of dimensional analysis

Three traditional problems in accelerative mechanics are chosen to exemplify the manner of working by the proportionalities method. The formal construction of a proportionality is given and the form of the dimensional matrix of a monomial is discussed. Having chosen the dimensional in which the (n+1) term reduction of the variables of a dimensionally homogeneous set is to be explicitly dimensionally homogeneous, the variables of other dimensions may be systematically combined, as necessary, to leave only terms in the first chosen dimension and one other. The variables of the first dimension, together with the proportionalities formed in terms of the first dimension, can then be arranged to encompass the whole relationship between the variables of the set. This is done in a manner which readily allows formal display of all the choices in the nondimensionalization process of reduction from the (n+1) term equation to the n term nondimensional equation.     

Validating culturally diverse students: Toward a new model of learning and student development

Conclusion This study demonstrated that nontraditional students, no matter how fragile, can be transformed into full members of the college academic and social community. The importance of this finding cannot be over stated, for it points to real hope for students who do not see themselves as college material or who feel that college life has little or nothing to do with the realities from which they come. What is needed to transform these students is for faculty, administrators, and counselors to fully engage in the validation of students and to recognize that not all students can be expected to learn or to get involved in institutional life in the same way. Diversity in nature is a strength. So is diversity among college students. The challenge is how to harness that strength, and how to unleash the creativity and exuberance for learning that is present in all students who feel free to learn, free to be who they are, and validated for what they know and believe.Laura Rendon has a Ph.D from the University of Michigan. She is currently an associate professor in the Division of Educational Leadership and Policy Studies at Arizona State University. She studies instructional and institutional issues related to the success of minority students, particularly Hispanic students and two-year colleges.     

Organisational cultures in public and private Portuguese Universities: a case study

Perceptions of organisational culture made by three categories of staff playing managerial roles in each of two Portuguese Universities (one public and the other private) were compared using a questionnaire adapted from the Organisational Culture Assessment Instrument and translated into Portuguese. The four scales of the questionnaire, designed to measure the Cultures of Clan, Adhocracy, Hierarchy and Market orientation were found to have adequate internal reliabilities, though a factor analysis raised doubts about the construct (factor) validity of two of the scales (Clan and Adhocracy). Application of a MANOVA to scores on the four scales of organisational culture showed, as hypothesised, that the private university was perceived to have significantly stronger cultures of Market orientation and Hierarchy than the public university. No overall difference was found between the universities for the cultures of Clan and Adhocracy. However, general managerial staff in both Universities perceived the cultures of Clan and Adhocracy to be stronger than was the case for technical managerial staff.     

It's a Holiday!!

This article studies various holiday distributions, the most interesting one being Easter. Gauss’ Easter algorithm and Microsoft Excel are used to determine that the Easter distribution can be closely approximated by the convolution of two well‐known uniform distributions.     

Illustrating Dependence between Random Variables Using Slot Machines

This article illustrates the concept of statistical independence using the example of slot machines that may be played on multiple lines.     

A Complex Systems Network Approach to Quantifying Peer Effects: Evidence From Ghanaian Preprimary Classrooms

Research on classroom peer effects has focused nearly exclusively on high-income countries and on academic skills. Little is known about peer effects in low-income countries and whether effects differ under different educational environments (e.g., teacher-directed versus child-centered, conditions of concentrated advantage or disadvantage). Based on a data set of Ghanaian preprimary classrooms in the Greater Accra Region collected in the 2015–2016 school year, we use complex system networks with multilevel modeling to study the presence and magnitude of peer effects. Results corroborated small statistically significant effects on academic and nonacademic skills (d = .06–.10). Peer effects on literacy were larger for children in public schools, who are relatively more disadvantaged than their private school counterparts. Teacher-directivity intensity did not moderate peer effects.     

Editorial: A Vision of a Fair and Efficient,Diverse and Inclusive,Cumulative Science of Child Development in the Best and Worst of Times

If you have come here in search of the submission requirements at Child Development, this is perhaps not the editorial you are looking for. Consider visiting instead our revised instructions to authors . Nor does this essay simply detail the priorities of the incoming board and the initiatives we will be implementing over the next 6 years, though these are summarized in Table 1. Rather, this editorial was written to articulate clearly the scientific values underlying current plans and policies at the journal in support of publishing the highest quality and highest impact research on child development. I emphasize two interrelated themes: (a) our plans for continuing to emphasize and enhance diversity and inclusion in research on child development and (b) our policies that remove impediments to cumulative developmental science. Discussion focuses primarily on how we are incentivizing efforts to achieve these widely held yet too often neglected goals, taking as its point of departure emerging challenges to a fair and efficient editorial process at the journal. In so doing, I mean to highlight the essential work of continuously cultivating editorial structures that firmly embed in developmental science fundamental scientific values, principles that make it possible for research on child development to flourish in both the best and worst of times.