A process model of cyberbullying in adolescence

Cyberbullying is an emerging form of aggression that utilizes information and communication technologies (ICTs). While cyberbullying incidents attract considerable attention, research on the causes and psychosocial predictors of cyberbullying is still limited. The present study used an integrated theoretical model incorporating empathy, moral disengagement, and social cognitions related to cyberbullying. Structured questionnaires were administered to 355 randomly selected adolescents (M = 14.7, SD = 1.20). Linear regression analysis showed that social norms, prototype similarity and situational self-efficacy directly predicted cyberbullying expectations. Multiple mediation modelling indicated that normative influences mediated the effects of moral disengagement and affective empathy on cyberbullying expectations. These findings provide valuable information regarding the effect of both distal and proximal risk factors for cyberbullying in adolescence, highlight the relationship between normative processes and moral self-regulation, and set the basis for related educational and preventive interventions.     

Instrument mediated activity: from subject development to anthropocentric design

The aim of this article is to present the ‘instrument-mediated activity’ approach, which is part of a ‘generative model’. A group of principles liable to contribute to the epistemological unity of generative models is put forward as well as a theoretical framework that conceptualizes what an instrument is for the subject. The article develops the idea that the instrument is a mixed entity born of both the subject and the artifact. The artifact is not an instrument in itself. It is the subject who grants it the status of a means for his/her action. Processes of design in usage by users are defined as ‘instrumental geneses’. Finally, the consequences of this model on the organization of design processes are examined, in taking into account instrumental geneses as resources for design.     

Spring Maize Yield Estimation based on Radiation Use Efficiency and Multi-temporal Remotely Sensed Data

In order to develop highly accurate model for crop yield estimation,an approach of retrieving regional crop yield was studied by Radiation Use Efficiency (RUE) and remote sensing data,the Jifangzha irrigation is of Hetao irrigation district of Inner Mongolia Autonomous Region was selected as a research case.Based on this model,the difference of the Dry Matter Accumulation (DMA) between the maize’s different growing stages is made and a comparative analysis of the measured yields,and the predicted results based on this model.The results show that the DMA of the maize’s jointing stage is maximal,about 40% of total amount.The measured yield and the predicted ones based on the model has a greater correlation,the Correlation Coefficient was 0.853 and passed the reliability of 0.01.The difference of the DMA in different growing stages showed that the sensitive degree was displayed between main growing stages and yield,and that were some key aspects:the main limiting factor in growing stages and raising yield.These results indicate the model for spring maize yield estimation is feasible and effective based on the RUE and multi-temporal remotely sensing data.     

广西壮族自治区土地整治工程质量第三方检测探索

以施工单位自检为主的检测模式不能完全保证工程质量，广西壮族自治区探索第三方检测新模式，以更好服务于土地整治工程建设。本文阐述了土地整治工程质量第三方检测背景、思路、技术措施及其在土地整治工程中的作用。     

Condom use by South African construction workers

Consistent and proper condom use is pivotal in preventing HIV infection. HIV prevalence in South Africa is among the highest in the world, with the construction industry especially affected, yet little is known about condom use by construction workers and the determinants thereof. Data were gathered from 512 site-based workers in the Western Cape. A theoretical model explaining condom use as a function of demographic factors, HIV knowledge, substance usage and risky sexual behaviour (excluding condom use) was proposed and tested using regression and structural equations modelling. The findings indicated that age, gender and level of education were indirect determinants of condom use, with higher levels of education predicting better AIDS-related knowledge. Higher levels of risky sexual behaviour were associated with more frequent use of condoms, suggesting greater awareness of risk. Condom use was adversely affected by greater alcohol and drug use, probably as a result of diminished capacity to assess risk. Finally, lower and not higher levels of AIDS-related knowledge were associated with better condom use, suggesting that improved knowledge of HIV transmission may work contrary to safe sex practice if it lulls the person into a false sense of confidence. Recommendations for targeted workplace interventions are proposed.     

高温超导可控电抗器研究进展

电抗器是重要的无功补偿装置,在电力系统中得到了广泛的应用。可控电抗器可根据运行工况调节输出容量,以稳定系统电压,控制补偿无功功率,提高系统稳定性。将超导技术应用于可控电抗器,利用其零电阻、高通流密度特性,可减小电抗器体积,降低损耗,提高可控电抗器利用效率。目前,高漏抗式高温超导可控电抗器和正交耦合型高温超导可控电抗器已先后研发成功,本文对两类高温超导可控电抗器的样机研制、电抗特性、关键技术问题进行了归纳与总结,对其性能特点进行了分析。     

浅谈安全用电的屏护和间距

主要讨论了安全用电的屏护和间距问题,用一系列数据使计量检定员懂得现场操作高低压设备的安全技术、最小安全距离等,工作中知己知彼,不出差错,从而达到事半功倍的效果.     

Influence of Hydride Re-orientation on BWR Cladding Rupture under Accidental Conditions

Hydride precipitation along the radial-axial plane increases in high burn-up boiling water reactor (BWR) fuel claddings. The radially-oriented hydrides may have an important role during fuel behavior in a reactivity-initiated accident and may reduce ductility of the cladding under pellet-cladding mechanical interaction (PCMI) conditions. In order to promote a better understanding of the influence of the radial hydrides on cladding failure behavior under the PCMI conditions, tube burst tests were conducted for unirradiated BWR claddings charged with 200 to 650 ppm of hydrogen. About 20 to 30% of hydrides were re-oriented and precipitated along the radial-axial plane. The claddings exhibited large rupture openings with an axial crack at room temperature and 373 K. The crack penetrated through cladding wall preferentially along the radial hydrides, and radial cross section showed cladding failure in a brittle manner. However, reduction in residual hoop strain by precipitation of the radial hydrides was very small. It is accordingly expected that ductility of high burn-up BWR cladding is significantly reduced not only by precipitation of radial hydrides as far as hydrogen concentration and radial hydride fraction range in the present study.     

Political mobilization through social network sites: The mobilizing power of political messages received from SNS friends

Recent political communication scholarship has examined whether social network sites (SNSs) contribute to political participation. Regarding SNSs’ mobilization effect, however, mixed results have been reported. This study, relying on representative survey data from the 2012 South Korean general election, investigates interplay between three factors influencing electoral participation: (1) type of SNS use (i.e., political versus nonpolitical use), (2) user characteristics (i.e., past voters versus nonvoters), and (3) directionality of SNS messages (i.e., messages received from versus those sent to SNS friends). Results indicate SNSs’ mobilization effect emerges when conditions are met. Voting intention is increased among past nonvoters who use SNSs through political messages received from their SNS friends. Theoretical and practical implications of SNSs’ mobilization effect are discussed.