Application of Wavelet Transform in Dual-differential Optical Fiber F-P Interferometric Micro-displacement Measurement System

Based on dual-differential comparing principle, an experimental system of optical fiber F-P interferometric micro-displacement measurement is introduced. It is capable of achieving the absolute displacement measurement, and wavelet transforms is adopted as theory fundament to extract the optical F-P interferometric characteristic signal and remove the noise, so its resolution can reach 0. 01 μm in the dynamic range of 0- 1 mm.     

一种高速8位单片机的电路实现

介绍了一种8位高速单片机的电路实现。该单片机采用哈佛结构、指令流水线、双数据总线、组合逻辑微控制器、进位链结构及机器周期为两倍时钟周期等方法，使设计的单片机在晶振为20MHz的条件下，每秒可执行600万条指令。     

关于开环机构末杆自由度计算方法的研究

本文运用对偶矢量量论定量地分析开环机构中各运动副所容许的相对运动在末杆上的反映，通过计算末杆独立对偶角速度来确定末杆独立运动的数目，从而得到一种求解末杆自由度的方法。     

Dual-receiver concept for solar towers

A new dual receiver concept improves the adaptation of the central receiver to the steam cycle in a solar thermal power plant. By combination of an open volumetric air heater with a tubular evaporator section the dual receiver concept profits from the advantages of these two basic concepts while their characteristic problems are avoided. This paper presents a concept study based on the configuration that was originally planned for the PS10 project in Spain, using the open volumetric receiver technology. The results show several benefits of the new concept, especially higher thermal efficiency of the receiver, lower receiver temperature and lower parasitic losses. Due to these improvements the annual output could be increased by 27%, compared to the solar air heating system.     

Integration of SiOC air gaps in copper interconnects

The formation of air gaps by means of a non-conformal chemical vapor deposition (CVD) on patterned wafers was successfully demonstrated using SiOC (K=2.9) as inter-level metal dielectric. This paper presents the results on physical characterization and electrical performance evaluation of integrated SiOC air gaps in a three-metal level Cu/SiOC interconnect module. The influence of the air gaps shape on parasitic coupling capacitance between copper lines was also discussed in accordance with mask design rules and processing steps.     

How Does Interactivity Persuade? An Experimental Test of Interactivity on Cognitive Absorption,Elaboration, and Attitudes

We explore theoretical mechanisms by which the interactivity of a medium enhances the persuasive potential of messages, by investigating the effects of 2 different types of website interactivity—modality interactivity and message interactivity—on the nature of user engagement with messages. In a 3 (Message Interactivity: High/Medium/Low) × 2 (Modality Interactivity: Slider/Control) factorial experiment (N = 167), we discovered that modality interactivity led to more positive assessment of the interface and greater cognitive absorption, contributing to more favorable attitudes toward the website and even toward the antismoking messages. However, it reduced the amount of message‐related thoughts. In contrast, message interactivity enhanced message elaboration, leading to more positive attitudes among those with low involvement in the message topic.     

Dual Screening the Political: Media Events,Social Media,and Citizen Engagement

Dual screening—the complex bundle of practices that involve integrating, and switching across and between, live broadcast media and social media—is now routine for many citizens during important political media events. But do these practices shape political engagement, and if so, why? We devised a unique research design combining a large‐scale Twitter dataset and a custom‐built panel survey focusing on the broadcast party leaders' debates held during the 2014 European Parliament elections in the United Kingdom. We find that relatively active, “lean‐forward” practices, such as commenting live on social media as the debate unfolded, and engaging with conversations via Twitter hashtags, have the strongest and most consistent positive associations with political engagement.     

新型Br鴑sted-Lewis双酸性离子液体的合成及其催化松香二聚反应

以盐酸为B酸供体将N-甲基咪唑(mim)质子化得到Brønsted酸性离子液体mim•HCl,继续与Lewis酸供体FeCl3反应合成了一族Brønsted-Lewis双酸性离子液体氯化-1-氢-3-甲基咪唑氯铁酸盐(1-x)[mim•HCl]x[FeCl3],式中x为Lewis酸所占的摩尔分数。分别用吡啶和乙腈探针红外光谱表征和比较了其酸性,并将其应用于催化松香的二聚反应。所合成的一族双酸性离子液体中, (1-x)[mim•HCl]x[FeCl3](x=0.64)催化松香二聚反应时,二聚产物的软化点比空白样品提高了15 oC;其催化活性在重复利用5次后才开始下降。     

新型双作用式摆动增压器的增压特性

针对传统双作用式增压器轴向尺寸较大的问题,设计了一种摆动式双作用增压器,介绍了其组成、工作原理,并简述了其增压缸参数的计算方法和摆杆强度的设计方法。利用AMESim软件对摆动增压器进行了建模仿真,仿真结果说明摆动增压器能实现连续增压。探讨了增压缸活塞面积和两增压缸间的中心距对摆动增压器增压特性的影响。     

双机械臂碰撞检测算法研究

为保障双机械臂在公共活动空间的安全性,提出了一种准确高效的碰撞检测算法。采用球体和胶囊体包围盒简化机械臂模型,根据包围盒之间的相交情况判断是否发生碰撞。通过二次投影法实现快速检测,将包围盒投影为线段,若投影线段未重叠则包围盒未相交;若投影线段有重叠,则将问题进一步转化为空间点到点、点到线段、线段到线段的最短距离求解。通过仿真软件和实体机械臂实验平台对算法进行了分析,结果说明,该算法检测效率高,可直接植入机械臂控制器程序中,满足安全性需要。