Prediction: A six-year follow-up

The prereading and reading performance of a group of 370 predominantly Hispanic, bilingual public school children was followed for six years. The aim of the study was to compare the factorial make-up and predictive validity of tests used in the current research with findings from a previous study. The early study had followed the children from the end of their kindergarten year until the end of second grade. For purposes of the present study a 13-test predictor battery was administered to the children at the beginning of their first-grade year. This battery included a number of measures used in the early study, among them a 5-test Screening Index developed in the course of that study. Records were obtained of the follow-up children’s 2nd, 3rd, 4th, 5th, and 6th grade reading test scores. Factor analysis of the pool of 13 predictor tests showed a two-cluster battery structure. These clusters closely resembled two of the four factors defined in the early study. As used with the group of bilingual children, the Screening Index misclassified many of the failing readers, as well as others who went ahead to read at grade level. The Screening Index quite accurately identified, across grades, children who eventually read well. A number of predictor tests administered at beginning of first grade continued to show significant correlations with reading at all grade levels. The consistent contribution of the predictor tests with reading points to their continuing usefulness as a point of departure for assessing children’s readiness to read. The investigation was conducted by the staff of the de Hirsch-Robinson Reading Clinic, Department of Pediatric Psychiatry, Columbia-Presbyterian Medical Center, and the New York State Psychiatric Institute. The work has been supported by generous grants from a number of private donors, among them The Beinecke Foundation, The Morgan Family Fund, The Lita Annenberg-Hazen Charitable Trust, Mr. Seymour Milstein of the Milstein Family Foundation, and Mrs. William Carey.     

Effects of vacancies on interwall spacings of multi-walled carbon nanotubes

We use molecular dynamics （MD） simulations to study the effects of vacancies on tube diameters and interwall spacings of multi-walled carbon nanotubes （MWCNTs）. Two types of vacancies, double vacancy and three dangling-bond （3DB） single vacancy, are identified to have opposite effects on the tube size change, which explains the inconsistency of the experimentally measured interwall spacings of MWCNTs after electron beam irradiation. A theoretical model to quantitatively predict the shrunk structures of the irradiated MWCNTs is further developed. We also discuss the fabrications of prestressed MWCNTs, in which reduced interwall spacings are desired to enhance the overall elastic modulus and strength.     

A simple and efficient device for demonstrating cross‐sectional anatomy of the head

Described in this article is a novel device that facilitates study of the cross‐sectional anatomy of the human head. In designing our device, we aimed to protect sections of the head from the destructive action of handling during anatomy laboratory while also ensuring excellent visualization of the anatomic structures. We used an electric saw to create 15‐mm sections of three cadaver heads in the three traditional anatomic planes and inserted each section into a thin, perforated display box made of transparent acrylic material. The thin display boxes with head sections are kept in anatomical order in a larger transparent acrylic storage box containing formaldehyde solution, which preserves the specimens but also permits direct observation of the structures and their anatomic relationships to each other. This box‐within‐box design allows students to easily view sections of a head in its anatomical position as well as to examine internal structures by manipulating individual display boxes without altering the integrity of the preparations. This methodology for demonstrating cross‐section anatomy allows efficient use of cadaveric material and technician time while also giving learners the best possible handling and visualization of complex anatomic structures. Our approach to teaching cross‐sectional anatomy of the head can be applied to any part of human body, and the value of our device design will only increase as more complicated understandings of cross‐sectional anatomy are required by advances and proliferation of imaging technology. Anat Sci Educ 2010. © 2010 American Association of Anatomists.     

Performance appraisal applied to leadership

Performance appraisal is a measurement process of how well an individual is doing her or his job. In most organisations, this appraisal is an annual event. Generally, it is done to encourage job performance, to flag areas that need attention, to inform both parties as to expectations. Much of the literature speaks to this process in terms of the performance appraisal of the employee. However, the leader’s performance is as important to the success of an organisation as the employee’s. This article provides comment on actual use of a survey on leader performance. In so doing, the article highlights how a process, performance appraisal, can be responsible for undesirable consequences when results and actions taken are not necessarily aligned.     

The grass was greener in the good old days: The “crisis” of out-of-print books

Are books going out of print faster than they used to? Or is this merely an illusion born of nostalgia or discontent? A brief statistical analysis of the data provides the answer.