整形 已成现代生活的一部分?!

只要提起"动手术",很多人都会毛骨悚然。然而却有越来越多人为了"变美"而甘愿挨刀子,在整形手术从拒绝到争议再到逐渐被接受的这个过程中,我们看到了技术的进步,和人们更加开放包容的态度。但这是否就意味着我们可以无条件地接受整形?做整形手术的人数在不断增加,但没有人会对此扬起眉毛啧啧称奇。去年英国"治疗"("治疗"一词似乎不太合适,但不管了)了50,122名整形人士,而其中90%是女性,同样也     

Investigating further preservice teachers’ conceptions of multidigit whole numbers: refining a framework

This study was designed to investigate preservice elementary school teachers’ (PSTs’) responses to written standard place-value-operation tasks (addition and subtraction). Previous research established that PSTs can often perform but not explain algorithms and provided a four-category framework for PSTs’ conceptions, two correct and two incorrect. Previous findings are replicated for PSTs toward the end of their college careers, and two conceptions are further analyzed to yield three categories of incorrect views of regrouped digits: (a) consistently as 1 value (all as 1 or all as 10), (b) consistently within but not across contexts (i.e., all as 10 in addition but all as 1 in subtraction), and (c) inconsistently (depending on the task).     

Effects of early and later family violence on children's behavior problems and depression: a longitudinal, multi-informant perspective

OBJECTIVES: To examine the effects of different forms of family violence at two developmental stages by assessing a sample of 110 Israeli children, drawn from the case files of Israeli family service agencies, studied longitudinally in both middle childhood and adolescence. METHODS: Information about the children's adjustment was obtained from parents, teachers, and the children themselves when the children averaged 10.6 and 15.9 years of age using the Child Behavior Checklist (CBCL), Teacher Report Form (TRF), Youth Self-Report (YSR), and Children's Depression Inventory (CDI). Information about the history of family violence was obtained from the mothers, fathers, children, and social workers. RESULTS: The results paint a mixed picture of the effects of family violence on children and adolescents. The relationship between concurrent behavior problems and abuse group varied by informant and study phase, although they were strongest when children were the informants. Predictions regarding the relationship between early abuse and later adjustment were only partially confirmed. Different informants did not agree about which groups of children were most adversely affected, there was little stability over time in the pattern of reported effects, and children were more likely than other informants to report levels of maladjustment that varied depending on recent or concurrent exposure to family violence. Many families changed their abuse status over time, and children who were new victims at follow-up had the most internalizing problems. Girls were found to be at more risk for internalizing and externalizing behavior problems than boys. CONCLUSIONS: Multiple informants are necessary to evaluate and assess the effects of family violence on children's behavior. Younger children may be more susceptible to the effects of family violence than older children, but problems manifest by some children may not carry over to adolescence. Changes in family and parenting practices, as well as in children's capacity to appraise and cope with family violence may help mitigate the adverse effects of family violence.     

Student Motivation to Learn via Computer Conferencing

This study investigates why some university students appear motivated to learn via computer conferencing (CC) whereas others do not, exploring the correlations of three key aspects of student motivation—reasons for engaging in academic learning (goal orientation), beliefs that they can acquire the ability to use CC (self-efficacy), and beliefs that learning to use CC will help them learn the course material (outcome expectations)—with satisfaction and with the frequency of CC contributions. Participants (n = 79) came from 4 graduate-level face-to-face courses and 1 undergraduate DE course. The results suggest that students who believe that CC will help them learn the course material are more likely to express satisfaction and to be active online, that students who believe that they are capable of learning how to use CC are more likely to be active online, and that students who are concerned about their relative performance compared to others tend to send fewer messages to conferences where online activity is not graded. Practical implications for instructors and suggestions for future research are described.     

A validation of the Dyslexia Adult Screening Test (DAST) in a post‐secondary population

In Ontario, Canada, there is a demand for psychometrically robust screening tools capable of efficiently identifying students with specific learning disabilities (SLD), such as dyslexia. The present study investigated the ability of the Dyslexia Adult Screening Test (DAST) to discriminate between 117 post‐secondary students with carefully diagnosed SLDs and 121 comparison students. Results indicated that the DAST correctly identified only 74% of the students with SLDs as ‘highly at risk’ for dyslexia. Although employing the cutoff for ‘mildly at risk’ correctly identified 85% of the students with SLDs, this also increased the percentage of students with no major history of learning problems identified as ‘at risk’ for dyslexia from 16% to 26%. These findings suggest that the DAST in its present form is limited in its ability to screen for SLDs. Implications for future research are discussed.     

Using the Cognitive Apprenticeship Web-based Argumentation System to Improve Argumentation Instruction

This study investigated how the instruction of argumentation skills could be promoted by using an online argumentation system. This system entitled ??Cognitive Apprenticeship Web-based Argumentation?? (CAWA) system was based on cognitive apprenticeship model. One hundred eighty-nine fifth grade students took part in this study. A quasi-experimental design was adopted and qualitative and quantitative analyses were used to evaluate the effectiveness of this online system in measuring students?? progress in learning argumentation. The results of this study showed that different teaching strategies had effects on students?? use of argumentation in the topics of daily life and the concept of ??vision.?? When the CAWA system was employed during the instruction and practice of argumentation on these two topics, the students?? argumentation performance improved. Suggestions on how the CAWA system could be used to enhance the instruction of argumentation skills in science education were also discussed.     

Coparenting,Parenting Stress,and Authoritative Parenting among Hong Kong Chinese Mothers and Fathers

SYNOPSIS

Objective. This paper examines whether the effects of spousal coparenting on authoritative parenting are mediated through parenting stress. Design. A total of 166 married, heterosexual couples in Hong Kong with a preschool child provided information about their spouse’s level of cooperation and triangulation in their coparenting relationship at Time 1; their own parenting stress at Times 1 & 2; and their authoritative parenting at Times 1, 2, and 3. Results. Cooperation at Time 1 affected fathers’ authoritative parenting at Time 3 completely mediated through fathers’ parenting stress at Time 2. There were no mediated or direct effects on authoritative parenting for mothers, although triangulation at Time 1 predicted mothers’ parenting stress at Time 2. Conclusion. Parenting stress mediates the relation between coparenting and authoritative parenting for fathers, suggesting the need to encourage cooperation from mothers. In this way fathers’ stress related to their role as parent will decrease, helping to promote their authoritative parenting.     

Rapid detection of natriuretic peptides by a microfluidic LabChip analyzer with DNA aptamers: Application of natriuretic peptide detection

Rapid detection of brain natriuretic peptide (BNP) concentration can be used for the diagnosis of acute heart failure and for the evaluation of the effectiveness of a clinical therapy. We used the systematic evolution of ligands by exponential enrichment method to develop DNA aptamers for BNP whose sequences were determined by cloning method and consensus sequence analysis. A total of eight conserved sequences was identified. By combining the fluorescent-labeled aptamers with fast protein lab-on-chip analysis, we could achieve quantification of BNP concentrations with high speed, sensitivity, and specificity.