Bulk modulus of semiconductors and its pressure derivatives

Expressions for the bulk modulus and its first and second pressure derivatives for group I–VII, II–VI, III–V and IV–IV semiconductor binary compounds are derived using an ab initio pseudopotential approach to the total crystal energy within the framework of local density functional formalism. The computed results are very close to the available experimental data.     

High-pressure phase transition and lattice dynamics of rock-salt and FeSi-type phases of MgS

A phase transition of MgS under high pressure is investigated using a first-principles method. It is found from energy-volume calculations that the rock-salt (B1) phase of MgS transforms into a FeSi-type (B28) phase at 143?GPa. The calculated ground-state parameters in the B1 phase are in excellent agreement with available experimental and theoretical data. Ab initio phonon calculations are also performed to investigate the structural behaviour of MgS under high pressure. An unstable transverse acoustic mode and a phase transition from B1 to B28 phase at ~143.7?GPa driven by this soft mode are predicted. The B28 structure of MgS is stable up to 350?GPa according to lattice dynamics calculations.     

Contextual analysis of home environment factors influencing the acquisition of early reading skills in Zambian families

This study examined the effect of home environment factors in the acquisition of early reading skills (orthographic awareness and decoding competence). To assess these factors, a sample of seventy-two (72) first grade learners (females?=?55%; age range?=?7–8 years) and their maternal parents (age range 26–61 years old) from low SES in Zambia's capital city, Lusaka were recruited. Parents, in response to a home literacy questionnaire, reported on their attitudes towards reading, literacy teaching in the home, the home literacy environment, presence of reading materials for adults and children, parental education, occupation, family size and family possessions. Two measures of reading skill were administered at school. Correlations revealed that parental education, occupation and the size of the family were not significantly associated with the reading measures. Family possessions, parental reading attitudes, literacy activities, and reading materials significantly predicted orthographic awareness. In predicting decoding competence, only family possessions, parental reading attitudes and literacy activities were predictive. Regardless of the context, children experience literacy in varied forms and quantities.     

Sex and the Right to HIV/AIDS Education in Early Childhood

This study explored how early childhood teachers (n=5) and young children (n=174) (age range 7 to 8 years; males = 81; females = 93) in two primary schools constructed and interpreted the right to HIV/AIDS education. Data were captured using individual interviews with teachers and group interviews with young children. Analysis of the data showed that teachers viewed young children's right to health information positively but did not consider the right to sexual information. Teachers operated within discourses which upheld the image of the child as innocent requiring protection from sexual knowledge. Children's perceptions of their rights to knowledge of sex in HIV/AIDS education showed ambiguity. Some accepted the right to know whilst others felt that knowledge about HIV/AIDS was inconsistent with childhood innocence.     

Effect of Relaxation Therapy in Reducing Blood Pressure of Essential Hypertension Patients

The study investigated the effect of relaxation therapy on arterial blood pressure of Patients with essential hypertension. Ten known essential hypertension patients (males = 3; females = 7, age range 41–70, mean age 57.2 years, SD = 9.93 years) were sampled randomly from Medical outpatient department of the State owned University teaching Hospital in Ebonyi State South East, Nigeria. These Participants were exposed to 30 minutes relaxation therapy and their blood pressures were taken before and after the treatment. Using matched t test to compare baseline and post treatment scores, result showed that relaxation therapy progressively decreased both diastolic and systolic blood pressure readings of the Participants. The study concluded that Relaxation therapy can transiently lower the systolic and diastolic blood pressure.     

Depth of processing and recall of threat material in fearful and nonfearful individuals

Abstract

Although many studies have examined the nature of memory distortions in anxious individuals, few have considered biases in specific memory processes, such as encoding or retrieval. To investigate whether the presentation of threat material facilitates encoding biases, spider fearful (n=63), blood fearful (n=73), and nonfearful (n=75) participants encoded spider related, blood related, and neutral words as a function of three levels of processing (i.e., structural, semantic, and self referent). Participants subsequently completed either a free recall or a recognition task. All participants demonstrated a partial depth of processing effect, such that they recalled more words encoded in the self referent condition than in the other two conditions, but groups did not differ in their recall of stimuli as a function of word type. Relative to participants in the other groups, spider fearful participants had fewer spider related intrusions in the recall condition, and they made fewer errors in responding to structural and semantic encoding questions when spider related words were presented. These results contribute to an increasingly large body of literature suggesting that anxious individuals are not characterized by a memory bias toward threat, and they raise the possibility that individuals with spider fears process threat-relevant information differently than individuals with blood fears.     

A Profile of Double Victims: Sexual Coercion by a Dating Partner and a Stranger

Victim profiles of sexual coercion might differ based on the type of perpetrator that initiates the coercion—namely, a stranger versus a dating partner. Some victims experience coercion from both types of perpetrators—referred to here as “double victims.” Survey data from 2,322 undergraduates at two relatively large U.S. universities in the Midwest and Southeast revealed in a multinomial logistic regression analysis that victims of distinct types of perpetrators had unique predictors as part of their overall profiles. Background characteristics associated with each type were identified. In comparison to nonvictims, a profile of double victims emerged—a White female who had been abused as a child, who had cohabited with a partner, used alcohol or drugs, had been emotionally abused by a partner, had lied to a partner, used the Internet to find a partner, had dated interracially, and had engaged in sex in a noncommitted relationship. Implications and limitations of these findings are included in the discussion.