雨水和中水回用对北京供水的潜在贡献(英文)

为寻找新途径以缓解北京市因日趋减少的年降水量和人口快速增长等因素引起的水危机,及地下水位迅速下降的状况,探讨了基于住户的分散式雨水收集和中水回用,作为减少地下水抽取和从其他地区调水的手段.通过案头案例研究,提出了雨水和中水结合式收集再利用的2个理念.基于粗略假设,计算表明采用升级理念可节约生活自来水消费的67.8%,而采用降级理念则节约5.9%.如果2 000万北京市民采用升级理念,将节约相当于0.545×109m3的年供水量.尽管先决条件诸多,如水处理技术、空间需求、能源和成本,以及公众接受能力,主张采用住户雨水收集和中水回用与其他措施相结合,以实现北京可持续的水管理.     

Children's opinions on effective strategies to cope with bullying: the importance of bullying role and perspective

In order to find out what children would suggest as useful interventions to stop bullying, we designed a questionnaire administered to 311 children (155 boys and 156 girls; mean age?=?11 years). Thirty-six items were employed to ask children how effective, in their opinion, retaliation, nonchalance and assertiveness could be in stopping bullying. Items were presented to children from three different perspectives (imagine you are the victim, the bully or a witness). We used peer reports to assess children's role in bullying. Children were grouped into bullies, followers of the bully, defenders of the victims, outsiders, victims and those not involved. The strategy most frequently chosen by all children was to cope with bullying through assertiveness. Bullies considered retaliation effective more often than their classmates, especially when they adopted the perspective of the victim or witness. Bullies did not consider assertive strategies as efficient in stopping the bully. Defenders, outsiders, victims and children not involved, on the other hand, were very much in favour of strategies aimed at solving the conflict through nonchalance or assertiveness, especially when they imagined being the bully. Girls chose assertive strategies more often than boys and younger children preferred nonchalance more often than older children, who tended to choose retaliation more often. Suggestions for intervention are made.     

A cross‐cultural comparison of teachers’ expressed beliefs about music education and their observed practices in classroom music teaching

Through interviews and observing day‐to‐day classroom practice, this study explores the beliefs of 10 music teachers in elementary schools in Vancouver and Hong Kong. The results demonstrate that the music teachers of the two localities hold similar cognitive beliefs about the essential elements of music education. However, they hold different beliefs about the value or impact of music education on the psychological or character development of students. Music teachers of Vancouver are found to be more student‐centred than their counterparts in Hong Kong, and this is reflected in both the curriculum and activities selected for classroom teaching. Though both groups of teachers place similar emphasis on western music, in Canada more classroom activities are based around the student’s personal enjoyment and expression. In Hong Kong, meanwhile, music education is viewed as a means of nurturing the student’s temperamental development. While students in Vancouver are allowed to express their personal musical preferences in classroom activities, in Hong Kong students are required to perform according to prescribed standard indicators of success. This is probably linked—albeit invisibly—to Chinese Confucian culture.     

Predicting Media Use in Very Young Children: The Role of Demographics and Parent Attitudes

This study used a survey design (N = 168) to examine how parent and child demographics, parental media-use motives, parental subjective norms, and parental attitudes toward preschool media use (PMU) are all related to actual media exposure among children 6 months to 5 years in age. Results indicate that, in accordance with the theory of reasoned action, parents’ perceived subjective norms regarding various categories of media were significantly related to actual child consumption. Further, positive attitudes toward media were significantly related to higher rates of child consumption. Interestingly, parental worries about media were only negatively related to television consumption and unrelated to child exposure to other kinds of media.     

Five-year-old children value reasons in apologies for belief-based accidents

Accidents can be intent-based (unintended action-unintended outcome) or belief-based (intended action-unintended outcome). As compared to intent-based accidents, giving reasons is more crucial for belief-based accidents because the transgressor appears to have intentionally transgressed. In Study 1, UK-based preschoolers who were native English speakers (N = 96, 53 girls, collected 2020–2021) witnessed two intent-based or belief-based accidents; one transgressor apologized, the other apologized with a reason. Five-year-olds, but not 4-year-olds, favored the reason-giving transgressor following a belief-based accident but not an intent-based accident (where an apology sufficed). In Study 2, 5-year-olds (N = 48, 25 girls, collected 2021) distinguished between “good” and “bad” reasons for the harm caused. Thus, 5-year-old children recognize when reasons should accompany apologies and account for the quality of these reasons.     

Hematocrit and flow rate regulate the adhesion of platelets to von Willebrand factor

Primary hemostasis and blood clotting is known to be influenced by the red blood cell volume fraction (hematocrit) in blood. Depressed or elevated levels of red blood cells can lead to vascular perfusion problems ranging from bleeding to thrombus formation. The early stage of hemostasis and thus blood clotting in all vessel sections from the arterial to the venous system involves the adhesion of platelets to von Willebrand factor. Here we present experimental and theoretical results showing that the adhesion probability of platelets to von Willebrand factor is strongly and nonlinearly dependent on hematocrit and flow rate. Interestingly, the actual binding forces are not markedly different, which suggest that the origin of such behavior is in the distribution of platelets. Using hydrodynamic simulations of a simple model, we explicitly show that the higher the hematocrit and the flow rate, the larger the amount of platelets residing close to the wall. Our simulation results, which are in excellent agreement with the experimental observations, explain why such phenomena occur. We believe that the nonhomogeneous red blood cell distribution as well as the shear dependent hydrodynamic interaction is key for the accumulation of platelets on the vessel wall. The work we present here is an important step forward from our earlier work on single molecules and extends into the collective cellular behavior of whole blood. It sheds new light on the correlation between hematocrit and the initial steps in hemostasis and thrombosis, and outlines advances for the treatment of vascular diseases associated with high levels of red blood cells. These results are not only highly relevant for the field of hemostasis and the physics of blood clotting but are also of powerful impact in applied science most obviously in drug delivery and colloidal science.     

What they learn when they learn coding: investigating cognitive domains and computer programming knowledge in young children

Educational technology research and development - Computer programming for young children has grown in popularity among both educators and product developers, but still relatively little is known...     

Games to Improve Students Information Literacy Skills

Abstract

As digital natives enter higher education, there is the need to improve their information skills but they often overestimate their information research skills and are unfamiliar with the library. The serious games give the opportunity for innovative and engaging approaches to information literacy learning. The paper describes NAVIGATE - Information Literacy: a Game-based Learning Approach for Avoiding Fake Content, a project funded by Erasmus?+?program. The Project aims to improve the competences to avoid fake content of the higher education students in the Humanities. The paper focuses on the comparative analysis of the students’ skills gap and the difficulty of actually assessing the learning improvement achieved by games, highlighting the lessons learned and the open issues.     

The effects of R&D tax credits on patenting and innovations

Norwegian business spending on R&D is low by OECD standards. To stimulate business R&D, in 2002 the Norwegian government introduced a tax-based incentive, SkatteFUNN. We analyze the effects of SkatteFUNN on the likelihood of innovating and patenting. Using a rich database for Norwegian firms, we find that projects receiving tax credits result in the development of new production processes and to some extent the development of new products for the firm. Firms that collaborate with other firms are more likely to be successful in their innovation activities. However, the scheme does not appear to contribute to innovations in the form of new products for the market or patenting.