Trapped thickness-twist modes in an inhomogeneous piezoelectric plate

The parameters of an extended Hubbard Hamiltonian for poly(dA)–poly(dT) and poly(dG)–poly(dC) homopolynucleotide duplexes in A- and B-deoxyribonucleic acid (DNA) geometries have been estimated within the framework of the Fortunelli–Painelli dimer model using Hartree–Fock semiempirical quantum chemistry reinforced by a configuration interaction scheme to include one- and two-electron excitations. It is tentatively concluded that inclusion of electron correlations is essential in treating DNA duplexes.     

Stacking fault and dislocation glide on the basal plane of graphite

Generalized stacking-fault energies for the basal plane of graphite are calculated from first principles for slip along two high-symmetry directions. The rhombohedral fault energy compares well with experiment and the anisotropy in behaviour is consistent with observed dislocation network geometry. Utilizing these calculated fault energies within a modified Peierls-Nabarro model, we estimate the barrier for basal dislocation motion based on lattice friction. This is found to be extremely small, from which we conclude that dislocation network interaction and pinning, rather than the Peierls barrier, must determine the practical shear strength of graphite. However, at low dislocation densities or over small crystallite regions, the shear strength should tend to this lower limit. We discuss the relevance of this to the mechanism of lubrication.     

The Needle in the Haystack

Summary

Despite the significant damages in sexual abuse cases, the plaintiff's ability to collect the money awarded in settlement or judgment is often precluded by the limited financial resources of the defendant(s). In this chapter, practicing attorney Julian Hubbard introduces the basics of individual and corporate insurance coverage and reviews the development of very limited coverage in sexual abuse cases in statutory and case law. While direct coverage for sexual abuse injuries is as rare as a “needle in a haystack,” indirect coverage can be found in some cases, especially those in which the acts of negligent individuals other than the perpetrator facilitated the abuse and thus the plaintiff's injuries. After an overview of relevant insurance issues and law, Mr. Hubbard delineates a practical model for research and legal strategies to ensure reaching any available insurance coverage, and explores the benefits and drawbacks of drawing on administrative resources to help pay for survivors' medical and mental health care.     

Total spin in the density matrix renormalization group algorithm

A new density matrix renormalization group (DMRG) algorithm is presented which conserves the total spin. This is the first time that standard DMRG is extended to exploit fully the symmetries of the Hamiltonian. The obtained general procedure works for any operator, even operators that do not commute with the Hamiltonian. The new method gives substantial improvements over the standard DMRG.     

Sexual Abuse Litigation

Summary

Practicing psychologist Janet Sonne and attorney Julian Hubbard illuminate how the different aims and languages of psychotherapy and law can be either an asset or a liability in the emotionally-charged environment of sexual abuse litigation. Properly understood, these differences can optimize the ability of each professional to assist their common client, the sexual abuse survivor, in the litigation process and beyond. Dr. Sonne reviews the psychological and behavioral sequelae of childhood sexual abuse and identifies six elements of the client's psychological functioning key to the litigation process, as well as posing questions for the attorney's self-evaluation for the unique demands of sexual abuse litigation. Mr. Hubbard then addresses what survivors and therapists need to know about the litigation process, exploring dynamics of legal strategy that can exacerbate the client's psychological problems. In the final section, both offer tips to enhance professionals' focus on education and communication as a means to better serving the sexually abused client.     

Serotonin transporter 5-HTTLPR genotype is associated with intrusion and avoidance symptoms of DSM-5 posttraumatic stress disorder (PTSD) in Chinese earthquake survivors

Background and Objectives: Prior studies have found that the serotonin transporter gene-linked polymorphic region (5-HTTLPR) interacts with trauma exposure to increase general risk for Posttraumatic Stress Disorder (PTSD). However, there is little knowledge about the effects of the interaction on distinct symptom clusters of PTSD. This study aimed to investigate the relation between the interaction of 5-HTTLPR and earthquake-related exposures and a contemporary phenotypic model of DSM-5 PTSD symptoms in a traumatised adult sample from China.

Design: A cross-sectional design with gene-environment interaction (G?×?E) approach was adopted. Methods: Participants were 1131 survivors who experienced 2008 Wenchuan earthquake. PTSD symptoms were assessed with the PTSD Checklist for DSM-5 (PCL-5). The 5-HTTLPR polymorphism was genotyped with capillary electrophoresis (CE) in ABI 3730xl genetic Analyzer.

Results: Although there was no significant interaction between 5-HTTLPR and traumatic exposure on total PTSD symptoms, respondents with the LL genotype of 5-HTTLPR who were highly exposed to the earthquake experienced lower intrusion and avoidance symptoms than those with the S-allele carriers.

Conclusions: The findings suggest that the 5-HTTLPR may have an important impact on the development of PTSD and add to the extant knowledge on understanding and treating of posttraumatic psychopathology.     

Maternal avoidance,anxiety cognitions and interactive behaviour predicts infant development at 12 months in the context of anxiety disorders in the postpartum period

BackgroundFew studies have examined the relation between anxiety disorders in the postpartum period and cognitive as well as language development in infancy.AimsThis longitudinal study investigated whether anxiety disorder in the postpartum period is linked to infant development at twelve months. A closer look was also taken at a possible link between maternal interaction and infant development.Study designSubjects were videotaped during a Face-to-Face-Still-Face interaction with their infant (M = 4.0 months). Specific maternal anxiety symptoms were measured by self-report questionnaires (Anxiety Cognition Questionnaire (ACQ), Body Sensations Questionnaire (BSQ), Mobility Inventory (MI)) to check for a connection with infant development. The Bayley Scales of Infant and Toddler Development-III (Bayley-III) were used to assess infant language and cognitive development at one year of age.Subjectsn = 34 mothers with anxiety disorder (SCID-I; DSM-IV) and n = 47 healthy mothers with their infant.Outcome measuresInfant performance on Bayley-III language and cognitive scales.ResultsInfants of mothers with anxiety disorder yielded significantly lower language scores than infants of controls. No significant group differences were found regarding infant cognitive development. Exploratory analyses revealed the vital role of “maternal avoidance accompanied” in infant language and cognitive development. Maternal neutral engagement, which lacks positive affect and vocalisations, turned out as the strongest negative predictor of cognitive development. Maternal anxiety cognitions and joint activity in mother-infant interaction were the strongest predictors of infant language performance.ConclusionsResults underline the importance to also consider the interaction behaviour of women with anxiety disorders to prevent adverse infant development.     

Affective facial expression in sub-clinically depressed and non-depressed mothers during contingent and non-contingent face-to-face interactions with their infants

BackgroundDepression in the postpartum period involves feelings of sadness, anxiety and irritability, and attenuated feelings of pleasure and comfort with the infant. Even mild- to- moderate symptoms of depression seem to have an impact on caregivers affective availability and contingent responsiveness. The aim of the present study was to investigate non-depressed and sub-clinically depressed mothers interest and affective expression during contingent and non-contingent face-to-face interaction with their infant.MethodsThe study utilized a double video (DV) set-up. The mother and the infant were presented with live real-time video sequences, which allowed for mutually responsive interaction between the mother and the infant (Live contingent sequences), or replay sequences where the interaction was set out of phase (Replay non-contingent sequences). The DV set-up consisted of five sequences: Live1-Replay1-Live2-Replay2-Live3. Based on their scores on the Edinburgh Postnatal Depression Scale (EPDS), the mothers were divided into a non-depressed and a sub-clinically depressed group (EPDS score ≥ 6).ResultsA three-way split-plot ANOVA showed that the sub-clinically depressed mothers displayed the same amount of positive and negative facial affect independent of the quality of the interaction with the infants. The non-depressed mothers displayed more positive facial affect during the non-contingent than the contingent interaction sequences, while there was no such effect for negative facial affect.ConclusionsThe results indicate that sub-clinically level depressive symptoms influence the mothers’ affective facial expression during early face-to-face interaction with their infants. One of the clinical implications is to consider even sub-clinical depressive symptoms as a risk factor for mother-infant relationship disturbances.     

Antenatal and postnatal depressive symptoms: Association with quality of mother–infant interaction

Antenatal and postnatal depression are independently associated with an increased risk of adverse infant development. A key linking mechanism is the quality of mother–infant interaction.ObjectivesThis study assesses the association between postnatal depressive symptoms (PDS) and their severity, with the quality of mother–infant interaction and compare the quality of mother–infant interaction and severity of the symptoms depending on the presence or absence of antenatal depressive symptoms (ADS).Methodsobservational study in 177 psychosocial risk mother–infant dyads from Chile (infant aged 2–12 months).ResultsMothers with PDS had lower maternal sensitivity and a more intrusive/controlling style than mothers without PDS, although the severity of the symptoms was not associated with lower maternal sensitivity. Maternal sensitivity did not differ in the postnatal depressed mothers depending on the presence of ADS, although the mothers differed in interaction style and the severity of symptoms. Mothers with ADS and PDS presented with a predominant intrusive/controlling interaction style and more severe depressive symptoms, whereas those with only PDS presented with a predominant nonresponsive/passive interaction style and reduced severity of symptoms.ConclusionsThe results corroborate the need to offer treatment and dyadic interventions to antenatal and postnatal depressive mothers and postulate that the presence of antenatal depressive symptoms may influence the subsequent mother–infant interaction style and greater severity of symptoms.     

Differential hemodynamic effects during the provision of active and passive support in the laboratory

Objective: Recent research has pointed to the cardiovascular benefits of providing social support to others in times of stress; however, little is known about what factors influence such benefits.

Design and measures: In a between-groups design, we investigated the possible interaction between intimacy (friend vs. stranger) and support type (active vs. passive) in determining the cardiovascular responses of support providers. Eighty participants had their blood pressure and heart rate monitored while providing either active or passive social support to a friend or a stranger who completed a stress task.

Results: Although there was no interaction effect, a significant main effect showed that those who provided passive support showed larger decreases relative to those in the active support condition. There was no effect of intimacy. Further, these effects withstood adjustment for a number of potential confounds (e.g. sex and body mass index).

Conclusion: It appears that the greatest physiological benefit for social support providers may come from providing passive, rather than active support, regardless of whether the support receiver is a friend or a stranger.     

Flow state in self-paced and externally-paced performance contexts: An examination of the flow model

ObjectivesKimiecik and Stein's (1992) flow model proposed that personal and situational factors affect the experience of flow. Singer, 1988, Singer, 2000 argued that different mental processes underlie self-initiated and reactive performances. The first purpose of this study was to examine main and interaction effects between imagery use and confidence on flow state in different performance contexts. The second purpose was to assess main and interaction effects between flow state, imagery, and confidence on self-paced service and externally-paced groundstroke performance in tennis.DesignThis field study used a repeated-measures design.MethodA pilot study was conducted to inform the set up of the two performance contexts. Flow states were assessed on two separate occasions, (a) for the service performance, and (b) for the groundstroke performance. A total of 60 junior tennis athletes completed imagery and confidence measures before the field test.ResultsA significant interaction between imagery and confidence was found for flow state in the groundstroke but not in the service task. No significant interaction effects were found for performance outcome. Flow state significantly predicted groundstroke performance, and imagery and confidence predicted service performance.ConclusionsThe examination of flow in different performance contexts is challenging. Imagery and confidence are central to the experience of flow. Flow state appeared to be more important for the externally-paced than self-paced task. The relationship between flow and performance is complex, which requires the conceptual expansion of Kimiecik and Stein's (1992) flow model.     

The Influence of Individual Attitudes on Construction of an Attitude Scale

Summary

The importance of talkativeness or the relative frequency of contributing to task interaction was examined as a factor which determines person perception. Both the quality and frequency of comments made in a two-person interaction were controlled by using experimental confederates who performed prescribed roles. Quantity but not quality of task contributions was significantly related to the attribution of creativity, and influence over others.     

Do developmental and temperamental characteristics mediate the association between preterm birth and the quality of mother-child interaction?

BackgroundThe current study aims to evaluate the association between preterm birth and the quality of mother-child interaction of very preterm-, moderate preterm-, and full-term-born children at 18 and 36 months and to determine whether developmental and behavioral characteristics mediate the association between preterm birth and the quality of mother-child interaction.MethodParticipants included 110 preterm-born children and 39 full-term-born children assessed at ages 18 and 36 months. Mother-child free play interactions, the Mullen Scales of Early Learning, the Infant Behavior Questionnaire, and the Early Childhood Behavior Questionnaire were administered.ResultsSignificant associations between preterm birth and the quality of mother-child interaction were found at 18 and 36 months. The mother-child interaction quality was less optimal for the preterm-born children compared with the full-term-born children, mainly so for the very preterm-born children. Unlike behavioral characteristics, cognitive development was found to mediate the association between the gestational age-based group and the quality of mother-child interaction.ConclusionsIntervention programs for preterm-born children and their families, should consider maternal and children’s behaviors during mother-child interactions, in addition to cognitive, language, motor and emotional regulation abilities, and particularly so with very preterm-born children, who exhibit slower cognitive development.     

How highlighted utensils influence consumption in a dark setting

Abstract

Objective: Previous research has shown that people consume less food in the dark compared to normal vision conditions. While this effect is commonly attributed to increased attention to internal cues, it could also be caused by increased difficulty to maneuver in a dark setting. This study investigated this potential alternative explanation.

Design: A 2 (dark versus normal vision setting)?×?2 (highlighted versus non-highlighted utensils) between-subjects design was employed.

Main outcome measures: Perceived difficulty of maneuvering and consumption of yoghurt were assessed as main outcome measures.

Results: Participants consumed marginally less in dark compared to normal vision conditions, and experienced higher difficulty of maneuvering. Importantly, both effects were qualified by a significant interaction with highlighting, which increased consumption and reduced perceived difficulty compared to no highlights. Difficulty of maneuvering did not mediate the interactive effect of vision and highlighting on consumption.

Conclusion: Difficulty to maneuver should be considered when investigating eating behaviour under dark conditions. In line with an embodied cognition account, results also reveal the necessity of visual information for interaction with objects in the environment and imply that detail-deprived object information may be sufficient for activation of the motor system.     

Infant brain responses to live face-to-face interaction with their mothers: Combining functional near-infrared spectroscopy (fNIRS) with a modified still-face paradigm

BackgroundNon-invasive imaging techniques, such as fNIRS, allow us to shed light on the neural correlates of infant’s social-emotional development within the context of parent-infant interaction. On a behavioral level, numerous studies have investigated parent-infant interaction employing the still-face paradigm and found that the primary caregiver(s), often the mother, is an important coregulator of the infant’s physiological and behavioral stress response. However, limited information is available on how the infant’s brain reacts to the maternal cues during real-life interaction.MethodsTherefore, the main aim of the current study was to design a fNIRS paradigm to study live mother-infant interaction and to explore the neural correlates of infant affect regulation during real-life dyadic interaction. To this end, a modified still-face paradigm was designed, which consists of live face-to-face mother-infant, and stranger-infant, interaction episodes, including stressful, “still-face” and non-stressful, “happy-face” interaction blocks, combined with infant fNIRS imaging.ResultsHemodynamic brain responses were collected in n = 10 (6 females, mean age 230.2 ± 17.5 days), typically developing infants using the Hitachi ETG-4000 continuous-wave system (22 channels spanning the frontal cortex; 10 Hz system sampling frequency). Infants with usable data (n = 7) showed negative activations, indicated by a decrease in oxygenated hemoglobin, over the middle frontal gyrus in response to happy-face (reunion) interaction with their mothers compared to a female stranger; suggesting deactivation of brain regions associated with affect regulation. We also explored correlations between infant brain responses to maternal interaction and infant characteristics (temperament) as well as experiential/environmental factors (mothers’ self-reported depression symptoms).ConclusionsAlthough the current results are very preliminary, they overall suggest that live design in infant populations is doable and offers unique opportunities to study the neural mechanisms underlying early caregiver(s)-child interaction in a more naturalistic context. Restrictions, and implications, of the methodology are critically discussed.     

Temperature dependence of the flow stress in Ir3Nb with the L12 structure

The effective s-d spin interaction is derived exactly for the one-impurity Anderson model via a unitary transformation. The unitary transformation has been calculated up to infinite order, thus an exact transformation was performed in the strict mathematical sense.     

Validation of the Portuguese version of the Negative Attitudes towards Robots Scale

IntroductionSocial robots are robots capable of a peer-to-peer communication with humans. Nomura, Kanda, and Suzuki (2004) developed the Negative Attitude towards Robots Scale (NARS) to measure the attitudes towards robots. NARS proved to be a useful tool to study human-robot interaction.ObjectiveTo assess the psychometric properties of the Portuguese version of the NARS (PNARS).Method and resultsFour studies were conducted. In study 1 (n = 300), a principal component analysis showed that PNARS comprised two components: the negative attitudes towards robots with human traits (NARHT) and towards interaction with robots (NATIR). In study 2 (n = 536), a confirmatory factorial analysis was conducted. Results confirmed the two-factor solution of PNARS obtained in study 1. Study 3 (n = 107) tested the nomological validity of PNARS and showed that PNARS, NARHT and NATIR correlated with attitudes towards technology. Study 4 (n = 59) tested the predictive validity of PNARS and showed that scores on NARHT and NATIR predicted the future intention to work with a social robot and its affective and cognitive antecedents.ConclusionGlobally, results indicate that PNARS is a reliable instrument to use in human-robot interaction studies.     

Effects of exercise self-schema on reactions to self-relevant feedback

ObjectivesThe purpose of this study was to test the influence of exercise self-schema on the processing of self-relevant information in the sport and exercise domain. It was hypothesized that exercise schematics would cognitively prefer consistent feedback over positive feedback (self-consistency principle), whereas affectively, participants without exercise self-schema would prefer positive feedback over consistent feedback (self-enhancement principle).DesignCross-sectional online study with a 2 × 3 mixed model design.Method472 subjects (52.54% female, M_age = 31.35, SD = 11.90) participated in an online-study providing them with bogus test results consistent with as well as positively and negatively deviating from their self-assessments in exercise-related aspects. To measure preference, affective and cognitive reactions were assessed after each feedback presentation.ResultsMixed-model ANOVAS (between-subject factor: exercise self-schema, within-subject factor: type of feedback) reveal significant interactions for both affective and cognitive reaction. However, these are not based on an interaction of the levels ‘consistent’ and ‘positive’ of type of feedback, but on an interaction of ‘negative’ and ‘consistent’ feedback. For exercise schematics, the gap between reactions to consistent and negative feedback is larger than for participants without exercise self-schema.ConclusionsThe original hypotheses could not be confirmed, indicating a general dominance of the self-enhancement principle. However, the unexpected interaction suggests that participants with exercise self-schema seem to devalue negative feedback more than those without exercise self-schema, which could be explained by self-consistency principles.     

A quantum-mechanical study of the stability of SnO 2 nanocrystalline grains

The purpose of this study is to gain insight into the instability which is observed, under operative conditions, in SnO 2 nanocrystalline materials. For this purpose, the binding and fragmentation energies of SnO 2 crystalline grains have been evaluated quantum-mechanically at a semiempirical level using the extended Debye-Hückel approximation. The inner structure of the grains is assumed to be an unreconstructed rutile lattice, as in the parent solid. The grain size and shape are variable and a parametric search has been carried out on both quantities. In broad terms the grains show a bulk-like behaviour, as their characteristic energies are approximately independent of their size and shape. However, the increases in the grain size and in the oxygen content may increase the grain stability. These features are discussed in the light of the properties of small clusters formed by tin and oxygen.     

Self-efficacy's influence on persistence on a physical task: Moderating effect of performance feedback ambiguity

ObjectivesThe present investigation was designed to test the predictions of a control theory based view of self-regulation on the complex effects of self-efficacy on persistence. Specifically, self-efficacy was predicted to have a positive effect on persistence given unambiguous feedback, but a weak, negative effect given ambiguous feedback. Moreover, the research was designed to replicate an influential set of studies on self-efficacy.DesignA 2 (self-efficacy: low, high) × 2 (feedback ambiguity: low, high) between-groups ANOVA was conducted to examine the interaction between self-efficacy and feedback ambiguity in two trials of an isometric hand-grip competitive endurance task.MethodParticipants (87 females and 67 males) competed on a hand-grip strength task against confederates who claimed to have overworked their hand (high manipulated self-efficacy) or to be tennis players (low manipulated self-efficacy). The competition occurred either in the presence (high feedback ambiguity) or absence (low feedback ambiguity) of a physical barrier between the individuals. Persistence was how long individuals could grip at 50% of their maximum voluntary contraction.ResultsThe interaction was significant and in the predicted direction. Self-efficacy was also found to negatively relate to self-reported effort regardless of condition.ConclusionsThe results from the current study confirm that self-efficacy can foster persistence when one is aware of one's current state of performance. However, consistent with a control theory view of self-regulation, self-efficacy was unrelated to persistence when feedback was ambiguous. The results have implications for understanding the role of self-efficacy in sports and highlight the importance of replications with extensions.