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Broadband omnidirectional visible spectral metamaterials

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Photonics Research 2023年第7期11卷 1284-1293页

作者： JING ZHAO XIANFENG WU DI CAO MINGCHAO ZHOU ZHIJIE SHEN XIAOPENG ZHAO medtronic plc BoulderColorado 80301USA Smart Materials Laboratory Department of Applied PhysicsNorthwestern Polytechnical UniversityXi’an 710129China

Optical metamaterials offer the possibility of controlling the behavior of photons similarly to what has been done about electrons in ***,most optical metamaterials are narrowband,and they achieve negative refraction within a small window of incident angles,making them impractical for common visible light systems that operate effectively over a wide range of frequencies and *** resistive loss at the resonant frequency of these metamaterials further prevents them from being deployed in the real ***,we develop a novel metamaterial randomly assembled by a list of narrowband,omnidirectional,and ultralow-loss meta-cluster systems using a bottom-up *** interactions among numerous meta-cluster sets greatly broaden the effective bandwidth of the overall structure,exhibiting frequency selectivity and spatial modulation when responding to white-light *** observe negative refraction in the 490–730 nm band,and observe an inverse Doppler effect at green,yellow,and red frequencies,across most of the visible *** method allows for low-cost fabrication of sizable broadband omnidirectional three-dimensional metamaterial samples,which opens the door to the rapid development of optical metamaterials,micro–nano assembly and preparation,tunable optical device engineering,etc.

关键词： visible directional refraction

Observational study of enzyme in instrument cleaning for sterile reprocessing and factors impacting enzyme activity

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中西医结合护理 2022年第5期8卷 13-18页

作者： ZHANG Zhengtao ZHONG Mingwei Hangzhou Hygen Health Biotechnology Co.Ltd. HangzhouChina310018 medtronic plc. MinneapolisMNUSA55432

Objective To evaluate the application of enzyme in instrument cleaning for hospital sterile reprocessing and different factors that impact the enzyme *** Standard soil objects for instrument cleaning quality evaluation,as testing coupons,were identified and used to evaluate different cleaning processes designed with varied *** testing groups using enzymatic detergent versus non-enzymatic detergent,the amount of residual protein on the testing coupons were quantified and compared at different soaking time(10min,20min,30min,45min and 60min).Then,within the enzymatic detergent group,different testing conditions were further explored by adjusting factors,in⁃cluding the soaking temperature(25°C,30°C and 45°C),use solution pH(7.0,8.0),and enzyme dosing(1/80,1/40,1/20,3/40,1/10 and 3/20 in v/v).Then,through an observational comparative study for each testing condition,the time needed to achieve a complete soil removal through visual inspection of the testing coupons was documented for *** In the test of enzymatic detergent versus non-enzymatic detergent,the non-enzymatic group did not show an obvious decline in the residual protein amount(1069μg at 10 min vs.1042μg at 60 min),whereas the enzymatic group showed significant decrease in residual protein quantity(947μg at 10 min vs.620μg at 60 min).Meanwhile,the amounts of the residual protein at different time points in the enzyme group(947μg at 10 min,864μg at 20 min,812μg at 30 min,691μg at 45 min,and 620μg at 60 min)were consistently lower than those at the same time schedule in the non-enzyme group(1069μg at 10 min,1069μg at 20 min,1067μg at 30 min,1059μg at 45 min,and 1042μg at 60 min).Furthermore,within the enzymatic group,the soaking temperature,use solution pH and enzyme dosing factors all appear to impact the enzyme activity and significantly contribute to the cleaning ***⁃cally,the higher soaking temperature,higher use solution pH and higher enzyme dosing showed

关键词： sterile reprocessing enzymatic cleaning factors process

Experimental study of the effect of wear parameters on the wear behavior of A356 alloy/cow horn particulate composites

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Defence Technology（防务技术） 2018年第1期14卷 77-82页

作者： B.Q.Ochieze C.C.Nwobi-Okoye P.N.Atamuo Lafarge Africa plc Mfamosing Plant Department of Mechanical Engineering Chukwuemeka Odumegwu Ojukwu University

Experimental study of the effect of wear parameters on the wear behaviour of A356 alloy reinforced with cow horn particles(CHp) produced by spark plasma sintering was investigated. Experiments were conducted based on the plan of experiments generated through Taguchi's(L9) technique. Tribometer was used for the wear test and Scanning electron microscope was used to analyse the worn scar of the samples. The results shows that, A356 alloy reinforced with CHp exhibited better dry sliding wear resistance than the unreinforced alloy. Wear rate decreased as the amount of CHp reinforcement increased in the matrix. It was found that, the optimum level of the factors with minimized the wear loss were obtained at: wt%CHp(20%), applied load(10 N), sliding velocity(3 m/s) and sliding distance(2000 m). It can be seen that the wear track of the sample are(D ? 0.81 and L = 42.85 mm) and(D ? 0.54 and L= 27.03 mm) for A356 alloy and composites at optimum condition respectively. The results showed that the addition of cow horn particles as reinforcing materials in A356 alloy composites increased the wear resistance of the composites greatly.

关键词： A356alloy Cow horn particles Microstructure Analysis of variance and wear behaviour

Virtual-reality-based digital twin of office spaces with social distance measurement feature

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Virtual Reality & Intelligent Hardware 2022年第1期4卷 55-75页

作者： Abhishek MUKHOPADHYAY G S Rajshekar REDDY KamalPreet Singh SALUJA Subhankar GHOSH Anasol PEÑA-RIOS Gokul GOPAL Pradipta BISWAS Indian Institute of Science BangaloreIndia BT plc UK

Background Social distancing is an effective way to reduce the spread of the SARS-CoV-2 *** students and researchers have already attempted to use computer vision technology to automatically detect human beings in the field of view of a camera and help enforce social ***,because of the present lockdown measures in several countries,the validation of computer vision systems using large-scale datasets is a *** In this paper,a new method is proposed for generating customized datasets and validating deep-learning-based computer vision models using virtual reality(VR)*** VR,we modeled a digital twin(DT)of an existing office space and used it to create a dataset of individuals in different postures,dresses,and *** test the proposed solution,we implemented a convolutional neural network(CNN)model for detecting people in a limited-sized dataset of real humans and a simulated dataset of humanoid *** We detected the number of persons in both the real and synthetic datasets with more than 90%accuracy,and the actual and measured distances were significantly correlated(r=0.99).Finally,we used intermittent-layer-and heatmap-based data visualization techniques to explain the failure modes of a *** A new application of DTs is proposed to enhance workplace safety by measuring the social distance between *** use of our proposed pipeline along with a DT of the shared space for visualizing both environmental and human behavior aspects preserves the privacy of individuals and improves the latency of such monitoring systems because only the extracted information is streamed.

关键词： Virtual environment Digital twin 3D visualization Convolutional neural network Object detection Social distancing

跻身未来的电力线通信 (九)plc-NET技术体制探讨

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电力系统自动化 2003年第14期27卷 87-90页

作者：李英敏陈启美许成南京大学plc研究组江苏省南京市210093

电力线通信网络 (plc NET)的推广和应用关键在于其技术体制的建立。文中分析比较了plc NET的现有标准 ,并指出其不足之处 ,进而结合我国实情提出了plc NET技术体制的设想 ,其中就plc NET的网络拓扑结构、网络体系结构、传输频段、调制... 详细信息

电力线通信网络 (plc NET)的推广和应用关键在于其技术体制的建立。文中分析比较了plc NET的现有标准 ,并指出其不足之处 ,进而结合我国实情提出了plc NET技术体制的设想 ,其中就plc NET的网络拓扑结构、网络体系结构、传输频段、调制技术、服务速率、信息跨越技术、家电和网络接口等方面提出了规范要求 ,对数据链路层的帧结构、差错控制和应用语言提出了具体建议 ,对收费制式、安全体系及网络管理也提出了相关措施。

关键词：电力线通信电力线通信网络标准化

跻身未来的电力线通信(八)基于IP的plc-NET业务融合

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电力系统自动化 2003年第13期27卷 82-86页

作者：许成陈启美舒悦南京大学plc研究组江苏省南京市210093

根据业务融合的需求 ,结合电力线通信网络 (plc NET)的特点 ,从IP网络结构体系的角度 ,提出了plc NET融合于IP网络的框架 ,描述了其结构层次 ,探讨了基于IP技术的plc NET的传输与控制 ,包括IP地址拓展、差错控制方式、多媒体的业务协议... 详细信息

根据业务融合的需求 ,结合电力线通信网络 (plc NET)的特点 ,从IP网络结构体系的角度 ,提出了plc NET融合于IP网络的框架 ,描述了其结构层次 ,探讨了基于IP技术的plc NET的传输与控制 ,包括IP地址拓展、差错控制方式、多媒体的业务协议、QoS的保障机制等 ,解释了家庭网络标准语言CAL及其应用 ,同时指出了plc NET的加密、防火墙等安全措施。

关键词：电力线通信网络体系结构 CAL 路由器网络安全数字水印

跻身未来的电力线通信 (七)plc组网方案及应用

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电力系统自动化 2003年第12期27卷 90-94页

作者：舒悦陈启美李英敏南京大学plc研究组江苏省南京市210093

在分析电力线通信网络 (plc- NET)的特点和应用优势的基础上 ,提出了 plc- HLAN,plc-VPN和 plc- AN等 3种组网方案 ;在描述 plc- HLAN的家电控制等服务的同时 ,给出了总线式家庭网络的硬件组成 ,分析了网络的 MAC子层的 CSMA/CD及应用层... 详细信息

在分析电力线通信网络 (plc- NET)的特点和应用优势的基础上 ,提出了 plc- HLAN,plc-VPN和 plc- AN等 3种组网方案 ;在描述 plc- HLAN的家电控制等服务的同时 ,给出了总线式家庭网络的硬件组成 ,分析了网络的 MAC子层的 CSMA/CD及应用层的 CAL协议的应用 ;在多种 plc- VPN的应用中 ,以自动抄表系统为例 ,给出了其组网的具体实现 ,包括网络的数据节点、集中和路由器的结构 ;在 plc- NET与电信网、计算机网的业务融合中 ,给出了 plc- AN的结构以及三网融合的接入方式。

关键词：电力线通信电力线通信网络 plc—HLAN plc—VPN plc—AN

Mycotoxins and the intestine

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Animal Nutrition 2015年第4期1卷 262-265页

作者： Leon Broom Anpario plc Manton Wood Enterprise Park

Fungal biochemical pathways can yield various compounds that are not considered to be necessary for their growth and are thus referred to as secondary metabolites. These compounds have been found to have wide ranging biological effects and include potent poisons(mycotoxins). Mycotoxins invariably contaminate crops and(thus) animal feeds. The intestine is the key link between ingested mycotoxins and their detrimental effects on the animal. Effects on the intestine, or intestinal environment, and immune system have been reported with various mycotoxins. These effects are almost certainly occurring across species. Most, if not all, of the reported effects of mycotoxins are negative in terms of intestinal health, for example, decreased intestinal cell viability, reductions in short chain fatty acid(SCFA)concentrations and elimination of beneficial bacteria, increased expression of genes involved in promoting inflammation and counteracting oxidative stress. This challenge to intestinal health will predispose the animal to intestinal(and systemic) infections and impair efficient digestion and absorption of nutrients, with the associated effect on animal productivity.

关键词： Fungi Gut health Immunity Intestine Microorganisms Mycotoxins

Effect of size and distribution of titanium carbide on microstructure and mechanical properties of Ti-25V-15Cr-2Al-0.2C-0.2Si alloy

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中国有色金属学会会刊：英文版 2005年第4期15卷 722-726页

作者：雷力明黄旭王宝赵红霞曹春晓 D.Rugg W.Voice Laboratory of Titanium Alloys Beijing Institute of Aeronautical Materials Rolls-Royce plc P.O.Box 31

The effect of size and distribution of titanium carbide on the microstructure and mechanical properties of non-burning β titanium alloy Ti-25V-15Cr-2Al-0.2C-0.2Si (mass fraction, %) was investigated. The microstructure of the heat-treated and exposed alloy was studied using optical microscopy(OM), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). It is found that carbides with finer size and more uniform distribution can suppress the formation of α precipitates more effectively, and can especially decrease the amount of grain boundary α precipitates after long-term exposure at 540℃ (the expected application temperature). Thus, significant improvement in thermal stability can be achieved by refining carbide particles in the matrix of the alloy.

关键词：二氧化钛微结构合金热处理