Robots in a domestic setting: a psychological approach

The study presented in this paper aims at improving the current understanding of human-robot interaction by adopting a psychological approach. The acceptability of robotic devices in home settings, especially by elderly people, does not depend only on the practical benefits they can provide, but on complex relationships between the cognitive, affective and emotional components of peoples images of robots. This study has investigated the main dimensions of these representations, by comparing the attitudes towards technology in general, and domestic robots in particular, held by people at different stages of the lifespan. The results confirm that age is a critical variable.     

PAP-D型铝塑复合材料热老化研究

复合材料一般由多种成分组合而成,温度的升高会引起各组分的膨胀,如果各组分的膨胀系数不一样,会引起复合材料的热应力疲劳.对PAP-D型铝塑复合材料进行了热老化试验,分析了温度对复合材料性能的影响.并以试验所得数据为基础对该材料在正常条件下的使用寿命进行评估,其寿命大于30年.     

提高小型充油式潜水电机修复可靠性的方法

对以QY系列为主体的农用小型潜水泵电机修复可靠性低、寿命短的问题,提出改进措施,可有效提高潜水电机的修复可靠性,延长电泵的使用寿命.     

PAP-D型铝塑复合防潮材料湿热加速老化试验研究

洞库条件影响弹药的储存寿命,就我国而言,随着科技的进步,洞库防潮材料经历了从塑料薄膜到高分子材料的阶段.通过对防潮领域的新型材料PAP-D铝塑复合材料在湿热条件下的加速寿命试验,评估材料在正常条件下的寿命及应用前景.     

Review on hydrogen fuel cell condition monitoring and prediction methods

A hydrogen fuel cell combines oxygen and hydrogen to generate electricity, which becomes a promising power source. The conditions of the fuel cell, such as health status, and faults, are essential for ensuring the continuous power supplying. There are technologies and algorithms carried out for fuel cell health monitoring, fault diagnosis, and prediction, lifespan prediction. For a comprehensive understanding, this paper proposed a comprehensive overview of the work on fuel cell conditions monitoring technology. It reviewed the works of literature from two different points of view, technology, and scenario. For technology view, there are model-based method, filter-based method, and data motivated method. For scenario views, it proposed a 5 × 5 tables for detail comparison. Based on this review, readers can easily understand the current status of condition monitoring technology for the fuel cell.     

Digital communications and psychological well-being across the life span: Examining the intervening roles of social capital and civic engagement

This study examined the relationship between multimodal connectedness (i.e. communicating with others through multiple digital channels) and subjective well-being. Analyses from a serial mediation model showed no direct relationship, but there were several significant mediating pathways through individual social capital, civic engagement and positive affect. Further analyses of three age cohorts (18–34, 35–54, 55–70+) demonstrated two significant indirect pathways for the 18–34 cohort, one for the 35–54 cohort, and five for the 55–70+ cohort. Even though the oldest cohort used fewer communication technologies and had smaller social networks, they are more likely to benefit from multimodal communications because they are motivated to engage in behaviors that result in positive emotions and feelings, which in turn engenders overall well-being. The study points to the utility of a lifespan perspective in understanding the effects of communication technologies in society.     

管桩模具的使用与高效修复工艺

分析了管桩模具的工作条件及损坏形式,指出了目前模具跑轮修复方法的不足,提出了利用自动堆焊设备修复管桩模具跑轮的工艺技术。研究表明,采用该工艺修复模具跑轮可大幅度提高修复效率,修复后模具的使用寿命甚至优于新模具。     

一种适用于最大偏转角度的新型柔性防水罩的研发应用

土耳其博斯普鲁斯海峡三桥吊索在设计时充分考虑了桥梁在运营期间,吊索在极限位置产生了大偏转角度,要求设计柔性防水罩来密封连接吊索于索导管从而保护吊索锚具不受雨水腐蚀。本文对柔性防水罩的选材、结构进行设计,通过理论计算、ANSYS分析来验算柔性防水罩的机械性能及密封作用。     

Development of a method to estimate the lifespan of proton exchange membrane fuel cell using electrochemical impedance spectroscopy

This paper proposes a new method for estimating the state and lifespan of fuel cells in operation by fuel cell equivalent impedance modeling by electrochemical impedance spectroscopy (EIS) and observing degradation. The performance change of fuel cells takes place in the form of changes in each parameter value comprising an equivalent AC impedance circuit; monitoring such changes allows for the prediction of the state and lifespan of a fuel cell. In the experiments, the AC impedance of high-temperature proton exchange membrane (PEM) fuel cells was measured at constant time intervals during their continuous operation for over 2200 h. The expression for the lifespan of a fuel cell was deduced by curve fitting the changes in each parameter to a polynomial. Electric double layer capacitance and charge transfer resistance, which show the reduction reaction of the cathode, were used as major parameters for judging the degradation; a method of using time constants is proposed to more accurately estimate the degree of degradation. In addition, an algorithm that can evaluate the soundness and lifespan of a fuel cell is proposed; it compares the measured time constant of the fuel cell being tested with that of average lifespan fuel cell.     

Energy optimal data propagation in wireless sensor networks

We propose an algorithm to compute the optimal parameters of a probabilistic data propagation algorithm for wireless sensor networks (WSN). The probabilistic data propagation algorithm we consider was introduced in previous work, and it is known that this algorithm, when used with adequate parameters, balances the energy consumption and increases the lifespan of the WSN. However, we show that in the general case achieving energy balance may not be possible. We propose a centralized algorithm to compute the optimal parameters of the probabilistic data propagation algorithm, and prove that these parameters maximize the lifespan of the network even when it is not possible to achieve energy balance. Compared to previous work, our contribution is the following: (a) we give a formal definition of an optimal data propagation algorithm: an algorithm maximizing the lifespan of the network. (b) We find a simple necessary and sufficient condition for the data propagation algorithm to be optimal. (c) We constructively prove that there exists a choice of parameters optimizing the probabilistic data propagation algorithm. (d) We provide a centralized algorithm to compute these optimal parameters, thus enabling their use in a WSN. (e) We extend previous work by considering the energy consumption per sensor, instead of the consumption per slice, and propose a spreading technique to balance the energy among sensors of a same slice. The technique is numerically validated by simulating a WSN accomplishing a data monitoring task and propagating data using the probabilistic data propagation algorithm with optimal parameters.