Actions,emotional reactions and cyberbullying – From the lens of bullies,victims, bully-victims and bystanders among Malaysian young adults

This paper examined the emotional reactions and actions involving cyberbullying, focusing on the cyber bullies, victims, bully-victims and bystanders. Gender analysis was conducted to examine if males and females behave and react differently. Self-administered surveys were used to gather data from a large sample of 1158 young adults, mostly university students in Malaysia (M_age?=?21.0?years; SD?=?2.16). Findings indicate the presence of cyberbullying perpetration after the schooling years, with 8% (N?=?93) bullying, 18.6% (N?=?216) victimization, 15.2% (N?=?174) bullying and victimization, and 53.4% (N?=?675) witnessing a cyberbullying incident in the past one year. Most of the bullies reported to be remorseful; however the majority did nothing after a perpetration. Most of the victims on the other hand, experienced anger, sadness and depression after a victimization with the majority claiming to have defended themselves (75%). The majority of the bully-victims regretted their actions, pitied the victims and felt angry after a cyberbullying perpetration/victimization. Bystanders mostly reported feeling pity for the victim and angry at the bullies, with the majority (61.5%) claiming to have defended the victims. However, 40% of them behaved indifferently out of fear retaliation. Finally, gender analysis revealed females to have significantly experienced more emotions than males whereas more males did nothing after a cyberbullying incident, both as victims and bystanders.     

卫星激光通信粗跟踪系统复合控制策略

针对卫星激光通信粗跟踪系统的跟踪稳定精度指标要求高的特点,建立了基于永磁同步电机直接驱动的粗跟踪系统模型并进行了跟踪稳定误差分析。在采用传统PID控制策略存在跟踪误差较大、动态性能较差等不足的基础上,提出了一种基于粗跟踪系统的改进型前馈复合控制策略。从理论上分析了前馈复合控制策略提高了粗跟踪系统的动态性能,为降低跟踪稳定误差提供了改善方案。地面实验验证结果表明,与传统控制策略相比,改进型复合控制策略极大地降低了系统的动态跟踪误差,动态跟踪误差由606μrad降低至13μrad(1δ)。进一步的在轨实验也验证了改进型复合控制策略的合理性和先进性,总体指标满足了卫星激光通信终端的极高精度要求。本文所提出的控制策略对其他高性能跟踪伺服系统设计也具有较大的借鉴意义。     

硫脲浸金新工艺的研究

近年来，用硫脲对含金矿石进行无毒浸出－同步电解提金是人们研究的热点之一。本文作者系统地研究了硫脲电解浸金的影响因素，考查了含金贵液电解时硫脲的再生情况，并与传统的氰化浸金进行了对比，得到了较好的结果，对我国黄金选矿具有一定的借鉴作用。     

基于自适应滑模观测器无位置传感器PMSM控制方法研究

针对无位置传感器永磁同步电机控制存在的转子位置与转速估计精度不高的问题,结合自适应算法设计了一种新型的自适应滑模观测器。滑模自身机制引起的系统抖振问题是影响电机转子位置与转速估计的最大因素。为了降抖减振,采用连续的sigmoid阈值函数代替sign符号函数;提出一个反电动势自适应估计环节代替传统的低通滤波器,提高反电动势估计精度;此外为了降低转子位置及其转速的估计误差,采用锁相环对其进行估计。最后,基于200W的PMSM搭建实验平台对上述改进算法进行验证。结果表明:电机转子位置与转速估计稳态误差分别为0.129 rad、79 r/min,能够实现无位置传感器PMSM高精度控制。     

计算机自动控制液压技术在桥梁整体安装工法中的应用

本文通过北京昌平西关环岛桥梁改造这一国内首次桥梁上部结构整体置换工程案例的主要实施过程,详细介绍了自行式运梁车、均载系统、同步顶升千斤顶系统、提梁机、万向千斤顶等分别采用不同功能的计算机自动控制集成液压技术。基于计算机有限元软件对空间异形结构各工况施工过程受力状况的精确分析和验证,结合计算计算机自动控制液压顶升技术在旧梁使用过程中支护、旧梁移动运输、旧梁提降破碎、新梁整体称重、新梁整体运输、新梁精确整体就位等关键工序中应用,满足支顶系统在异形板各支点反力差异大情况下的自动调整适应、保持梁体变形在移动过程中路线纵横坡度变化下的有效控制,是新工法得以顺利实施的重要前提。     

风电叶片部件疲劳试验机跟随控制策略研究

针对风电叶片部件疲劳试验过程中实际载荷与期望载荷跟随效果差的问题,提出一种超前自校正与改进线性自抗扰(LADRC)相结合的同步控制策略。该方法通过对实际载荷进行自校正补偿与系统误差以及外部扰动一起输入到改进线性自抗扰控制器,从而实现加载力和频率的有效控制。对疲劳试验机油电液伺服系统控制算法进行仿真分析,并通过搭建现场试验平台对同步控制策略进行有效性验证。仿真及试验结果表明：在较大载荷疲劳试验过程中,该控制策略显著提升系统的快速响应性和抗干扰能力,载荷误差控制在1%以内,相对于传统ADRC控制算法同步误差减小了56.14%,有效实现了风电叶片部件疲劳试验载荷的精确控制。     

6400吨液压复式起重机测控系统研究

6400吨液压复式起重机是全球起重能力最大的陆地起重机,最大额定起重量6400吨,起吊高度120米,设备设计制造国产化率100%。到2013年底,已成功应用于山西潞安高硫煤清洁利用油化电热一体化示范项目两台费托合成反应器的吊装。本文介绍了该起重机测控系统的组成和基本性能,对石油化工行业大型反应器罐的吊装具有重大推广意义。     

Development of a real-time non-intrusive appliance load monitoring system: An application level model

The research “Behavior Change and Energy Use” (US Department of Energy and Climate Change, 2011) [1] shows that with better information in the monthly electricity bill, the Energy Performance Certificate (EPC) can encourage people to reduce their energy usage. That is why smart meters - the emerging technology to help people to know their monthly energy consumption, are gradually replacing mechanical power meters. In this paper, we investigate a special energy monitoring process named Non-Intrusive Appliance Load Monitoring (NIALM), which is potentially the best method to give consumers pertinent information with respect to power consumption. However, real-time feedback feature in a low cost NIALM system is still a big challenge in such technology because of the complication in NIALM’s algorithms. System on Chip (SoC) technology can solve this challenge. Besides including high-speed interconnection and multi-processors, integrating Field-Programmable Gate Array (FPGA) into SoCs may be the most important evolution, which provides developers a powerful tool to develop a low cost but high performance system. Therefore, in this paper we proposed a development of a real-time NIALM system based on the SoC with FPGA acceleration.     

Frequency support capability of variable speed wind turbine based on electromagnetic coupler

In the variable speed wind turbine based on electromagnetic coupler (WT-EMC), a synchronous generator is directly coupled with grid. So like conventional power plants WT-EMC is able to support grid frequency inherently. But due to the reduced inertia of synchronous generator, its frequency support capability has to be enhanced. In this paper, the frequency support capability of WT-EMC is studied at three typical wind conditions and with two control strategies—droop control and inertial control to enhance its frequency support capability. The synchronous generator speed, more stable than the grid frequency which is the input signal for Type 3 and Type 4 wind turbine frequency support controller, is used for the calculation of WT-EMC supplementary torque command. The integrated simulation environment based on the aeroelastic code HAWC2 and software Matlab/Simulink is used to build a 2 MW WT-EMC model and study the frequency support capability of a wind farm consisting of WT-EMC.     

Synchronous fluorescence and multivariate classification analysis as a screening tool for determining Sudan I dye in culinary spices

Spices are a globally traded commodity which has been found to be adulterated with forbidden Sudan dyes. This work proposes a screening method for determining the adulteration of paprika varieties (mild, hot and smoked) with Sudan I dye, based on constant-wavelength synchronous fluorescence spectroscopy with multivariate classification. Different wavelength-intervals (Δλ) were evaluated. Classification models were built with Partial Least Squares-Discriminant Analysis (PLS-DA) at two Sudan I dye concentration levels (1 and 5 mg L⁻¹) and they were tested with samples at a lower level (0.5 mg L⁻¹). Classification results were quite satisfactory when a strategy based on first-derivative spectra was used for improving classification results. Δλ = 60 nm was chosen as the optimum wavelength interval giving a 100% of sensitivity and specificity. These results are promising because the risk of assigning adulterated samples as safe to be consumed is highly minimized. The proposed method is feasible, rapid and simple taking advantage of Sudan I fluorescence phenomena in a direct way.