Acrylic emulsion paint films: The effect of solution pH,conductivity, and ionic strength on film swelling and surfactant removal

To date, a limited number of aqueous conditions have been tested experimentally as potential cleaning reagents on modern acrylic paint films. Those assessed have tended to extract measurable quantities of paint film components and distort the paint films physically. In this paper the results of a series of experiments designed to examine pH, conductivity, and specific ion effects of potential aqueous cleaning solutions on a series of commercial acrylic paints are reported. A three-dimensional microscopic technique was used to characterize the physical (volume and surface roughness) changes and liquid chromatography-tandem mass spectrometry was used to characterize the chemical (extracted surfactant) changes following paint film exposure to the aqueous solution. The tested paint films in this study clearly exhibit an isotonic point below which swelling and extraction is significant, and above which the swelling and extraction is diminished. Manipulation of conductivity and the ionic species in solution can reduce both the physical film changes and surfactant extraction from acrylic paint films; while pH appears to be of limited use in controlling aqueous cleaning effects. Moreover, there seems to be a specific ion effect for both swelling and de-swelling in acrylic paint films that can be rationalized through the Hofmeister Series.     

On rubrication of the division <Emphasis Type="Italic">spintronics</Emphasis> in a separate edition of the abstract journal of the VINITI RAS <Emphasis Type="Italic">solid-state physics</Emphasis> (<Emphasis Type="Italic">Electrical Properties</Emphasis>)

The necessity for publishing a separate abstract journal on spintronics, which is a new, rapidly developing branch of physics, is substantiated. The interest in spintronics, which is the study of fundamental processes involving the simultaneous transport of both electron charge and electron spins in solids, as well as the interaction of electrons with a magnetic grating, is determined not only by its fascinating prospects but also the results that have already achieved. The spin and charge “degrees of freedom” open possibilities for the creation of semiconducting devices with parameters that are much superior to the existing ones and also the construction of devices that do not have analogues at present. First of all, this will permit problems of information transmission and processing to be solved in a new way. A detailed rubrication on spintronics is given in order to discuss the possibility of publishing a separate edition of an abstract journal devoted to spintronics.     

Thought in the face of violence: a child's need

OBJECTIVE: This article provides a clinical perspective on the combined impacts on children of spousal violence in the home and the absence of attuned parental thought that accompanies it. METHODS: This article takes the form of a commentary, drawing on clinical case studies and research literature to illustrate the child's experience of "unthinking," nonreflective parental states of mind, from the point of witnessing violence through to contact arrangements post-separation. Parallel dynamics and impacts are discussed with caregiving and legislative systems. RESULTS: The article suggests that "unthinking" states of mind in parents can be as damaging for a child as the overt witnessing and experiencing of violence. CONCLUSIONS: The prevention or early overturning of unthinking states of mind, in and out of the home, greatly influences the nature of a child's recovery from domestic violence.     

Exploring the nexus between community cultural wealth and the academic and social experiences of Latino male achievers at two predominantly White research universities

Latino males are grossly underrepresented at four-year postsecondary institutions in the United States. This phenomenological study seeks to address this emergent educational crisis by focusing on the experiences of two Latino male achievers at predominantly White research universities. Community Cultural Wealth is used to explore how Latino male collegians with a cumulative grade point average (GPA) above 3.75 employed linguistic, resistant, and navigational capital to enhance their academic and social experiences during college. The reports offered by participants in this study are intended to advance knowledge regarding the experiences of Latino male collegians as well as to enhance research, policies, and practices that increase the educational attainment of Latina/o students within higher education.     

Measurement of infant difficultness.

The Infant Characteristics Questionnaire (ICQ) was developed as a short, factor-analytic screening device for difficultness. Responses of 322 mothers of 4-6-month-old infants suggested that they regard the fussy, hard-to-soothe, labile infant as difficult. Mother report on the ICQ, particularly on the main fussy-difficult factor was found to have adequate reliability over time and convergence with the Carey Survey of Temperamental Characteristics, with father report on the ICQ, and, to a lower degree, with home data collected by independent observers. It was also found that mother characteristics may affect perceptions of infant difficultness: multiparous, extraverted mothers tended to rate their infants as easy.     

Infant Pathways to Externalizing Behavior: Evidence of Genotype × Environment Interaction

To further the understanding of the effects of early experiences, 9-month-old infants were observed during a frustration task. The analytical sample was composed of 348 linked triads of participants (adoptive parents, adopted child, and birth parent[s]) from a prospective adoption study. It was hypothesized that genetic risk for externalizing problems and affect dysregulation in the adoptive parents would independently and interactively predict a known precursor to externalizing problems: heightened infant attention to frustrating events. Results supported the moderation hypotheses involving adoptive mother affect dysregulation: Infants at genetic risk showed heightened attention to frustrating events only when the adoptive mother had higher levels of anxious and depressive symptoms. The Genotype × Environment interaction pattern held when substance use during pregnancy was considered.     

The relative benefits of learning by teaching and teaching expectancy

The purpose of this study was to explore the hypothesis that learning is enhanced through the act of teaching others. Specifically, two experiments aimed to disentangle the relative effects of teaching expectancy (i.e., preparing to teach) and actually teaching (i.e., explaining to others for instructional purposes) on learning. Some participants studied a lesson on the Doppler Effect without the expectation of later teaching the material and then took a comprehension test on the material (control group). Other students studied the same lesson with instructions that they would later teach the material; of those expecting to teach, some participants actually taught the material by presenting a brief video-recorded lecture before being tested (teaching group), whereas others only prepared to teach before being tested (preparation group). Results of Experiment 1 indicated that both the preparation group and teaching group significantly outperformed the control group on an immediate comprehension test (Teaching vs. Control: d = 0.82; Preparation vs. Control: d = 0.59). However, when the same test was given following a one-week delay (Experiment 2), only the teaching group significantly outperformed the control group (Teaching vs. Control: d = 0.79; Preparation vs. Control: d = 0.24). Overall, these findings suggest that when students actually teach the content of a lesson, they develop a deeper and more persistent understanding of the material than from solely preparing to teach.     

English Premiership Academy knee injuries: lessons from a 5 year study

This study addresses the epidemiology of knee injuries in adolescent males. Data were collected prospectively from 41 Premiership soccer academies over a 5 year period from July 2000 to June 2005. A total of 12,306 player seasons were registered in the U9 to the U16 age categories with a total of 1750 recordable injuries specific to the knee joint. There was a mean incidence of 0.71 (95% confidence interval ± 0.05) knee injuries per player per year, and a median of 17 (inter-quartile range 9-38) training days and 2 (inter-quartile range 1-4) matches missed per knee injury. Knee injuries were found to be most common in the 14-16 year age group. Six hundred and nine (35% of total) injuries were classed as severe resulting in more than 28 days' absence. Injuries were more likely to be sustained in a competitive or match-play environment (862 or 52%) than in training (796 or 48%), and a non-contact mechanism was implicated in 823 (55%) of recorded cases. Peaks in injury numbers were seen in early season and subsequent to the winter break. Sprain was the most common diagnosis recorded, with the medial collateral ligament affected in 23% of all knee injuries. Knee injuries are common in elite youth footballers. In this uninsured age group, it could be argued that earlier medical intervention may reduce long-term damage to the immature skeleton.