Multiplane displays based on liquid crystals for AR applications

Multiplane displays are capable of displaying 3D scenes with correct focus cues by creating multilayer 2D images in the display volume. Hence, such a 3D display technique could effectively address the accommodation‐vergence conflict (AVC) problem, which is prevalent in augmented reality (AR) displays. In this paper, we review the recent progress on multiplane AR displays based on liquid crystals (LCs) for AR applications. The working principle of multiplane AR displays is illustrated, the electro‐optical properties of the tunable LC devices are investigated and display prototypes are demonstrated. Finally, we discuss the prospects and challenges of multiplane AR displays based on LCs.     

表面形貌对粗糙接触界面流体润滑特性的影响

为探究不同表面形貌对粗糙接触界面液体润滑特性的影响，基于有限差分法结合雷诺方程和膜厚方程，研究阶梯形貌、波纹形貌、随机形貌和峡谷形貌4种不同粗糙接触界面液体润滑时的载荷分布及规律。研究发现：4种粗糙表面的三维载荷分布规律都与其表面形貌相对应，在波“峰”处载荷大，摩擦力随载荷的增大而增大，在波“谷”载荷小，摩擦力随载荷减小而减小；4种粗糙表面的载荷随表面展开面积比的变化趋势却有所不同；随表面展开面积比的增大，阶梯形貌表面的载荷呈线性增大，波纹形貌表面的载荷基本不变，随机分布形貌表面的载荷呈增大趋势，峡谷形貌表面的载荷呈先增大后减小的变化趋势。研究结果可以进一步补充现有表面形貌表征和流体润滑等相关研究理论。     

高能量离子束诊断质谱仪的研制及性能表征

本研究开发了一台应用于高能量离子束诊断的直线式飞行时间质谱仪，实现了其与高能真空弧放电离子源的联用。该仪器加速电压30 kV，飞行腔有效飞行距离1.5 m，通过短脉冲离子门精确截取，ICCD高速相机优化聚焦，仪器分辨率优于90 FWHM，对放电过程中产生的等离子体可实现不同时间的离子成分分析。将该方法用于真空弧放电离子源放电过程中离子成分的检测，放电2 μs时，电离成分以气态离子C⁺、O⁺、C²⁺、O²⁺为主；放电6 μs后，除气体成分外，还可以检测到Fe⁺、Cu⁺及其同位素金属离子峰。该仪器能够给出离子源放电产生离子的种类、价态以及相对含量等信息，可实现整个放电过程产生离子成分信息的准确诊断。     

Distributionally robust optimization of home energy management system based on receding horizon optimization

This paper investigates the scheduling strategy of schedulable load in home energy management system (HEMS) under uncertain environment by proposing a distributionally robust optimization (DRO) method based on receding horizon optimization (RHO-DRO). First, the optimization model of HEMS, which contains uncertain variable outdoor temperature and hot water demand, is established and the scheduling problem is developed into a mixed integer linear programming (MILP) by using the DRO method based on the ambiguity sets of the probability distribution of uncertain variables. Combined with RHO, the MILP is solved in a rolling fashion using the latest update data related to uncertain variables. The simulation results demonstrate that the scheduling results are robust under uncertain environment while satisfying all operating constraints with little violation of user thermal comfort. Furthermore, compared with the robust optimization (RO) method, the RHO-DRO method proposed in this paper has a lower conservation and can save more electricity for users.     

食物过敏原相关研究新动态

正食物过敏是机体对摄入的某些食物蛋白的异常免疫反应,食物过敏症状大都表现在胃肠道、皮肤和呼吸道等部位。一些国外流行病学调查研究表明,在世界范围内食物过敏影响近6-8%的儿童和2.5%的成年人,食物过敏患者日益增多。除此之外,一些食物过敏症严重影响了人们的生命安全和生活质量,因此食物过敏已成为广泛关注的食品安全问题。1995年,联合国粮食与农业组织(Food and Agriculture Organization of the United Nations, FAO)和世界卫生组织(World Health Organization,WHO)公布了八大类常见过敏食物,包括花生、大豆、鸡蛋、牛奶、甲壳类、     

Reducing resistance and curing temperature of silver pastes containing nanowires

Low temperature silver pastes can be widely applied on thin-film switch, flexible printing line and touch screen. In this article, we investigated printability and conductivity of silver pastes with silver wires of different diameters and content, and the conductivity of the silver pastes cured at different temperatures filled with different types silver powders and silver wires. The sheet resistance of silver pastes cured at 100 °C with Ag1 powders and Ag2 powders filled with 10 wt% silver wires of 100 nm diameters is 21.93?±?1.63 and 23.16?±?1.44 Ω/□, which is lower than the same samples cured at 135 °C without silver wire fillers. Tap density of Ag1 and Ag2 powders mixed with silver nanowires is higher than that of Ag3 powders mixed with nanowires, due to a higher filling ratio of Ag1 and Ag2 powders with silver nanowires. SEM results show silver pastes filled with Ag1 and Ag2 powders formed network when silver nanowires were added.     

醇脱氢酶在聚乙烯膜表面的固定化研究

以聚丙烯酸（PAA）改性的聚乙烯（PE）膜为载体，研究了醇脱氢酶（ADH）的两种固定化路线，并以甲醛为底物考察了固定化酶的催化性能。路线1用聚乙烯亚胺（PEI）进一步改性，使用戊二醛（GA）固定化ADH。最优固定化pH为6.0，温度为5～15℃，酶浓度为1.0 mg/ml，GA浓度为0.01%(质量)；固定化酶的最适反应pH为6.5，温度为15～30℃，反应速率最高为9.6 μmol/(L·min)；重复利用10次后可保持47.3%的活性。路线2以PAA-PE为载体，用1-(3-二甲氨基丙基)-2-乙基碳二亚胺盐酸盐（EDC）和N-羟基琥珀酰亚胺（NHS）为活化剂，固定化ADH。EDC和NHS最优摩尔比为1∶0.5，固定化时间为24 h；固定化酶的最适反应pH为6.5，温度为20～37℃，反应速率为15.58 μmol/(L·min)；重复利用10次后可保持53.8%的活性。