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Optical and NH<sub>3</sub>Gas Sensing Properties of Hole-Transport Layers Based on PEDOT: PSS Incorporated with Nano-TiO<sub>2</sub>

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Materials Sciences and Applications 2017年第9期8卷 663-672页

作者： Lam Minh Long Tran Quang Trung Vo-Van Truong Nguyen Nang Dinh university of Engineering and Technology VNU in Hanoi Hanoi Vietnam university of Natural Science VNU in HoChiMinh City Ho Chi Minh City Vietnam Department of Physics Concordia University Montreal Canada

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) incorporated with nanocrystalline TiO2 powder (PEDOT:PSS+nc-TiO2) films were prepared by spin-coating technique. SEM surface morphology, UV-Vis spectra and NH3 gas sensing of were studied. Results showed that the PEDOT:PSS+nc-TiO2 film with a content of 9.0 wt% of TiO2 is most suitable for both the hole transport layer and the NH3 sensing. The responding time of the sensor made from this composite film reached a value as fast as 20 s. The rapid responsiveness to NH3 gas was attributed to the efficient movement of holes as the major charge carriers in PEDOT:PSS+nc-TiO2 composite films. Useful applications in organic electronic devices like light emitting diodes and gas thin film sensors can be envisaged.

关键词： PEDOT:PSS+nc-TiO2 Composite UV-Vis Spectra J-V Characteristic Thermal Sensing Property Hole Transport Layer NH3 Gas Sensing

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操作系统与Oracle内存管理比较

现代计算机 2021年第19期27卷 152-154,169页

作者：王润中 Gina Code School of Engineering and Computer Science Concordia UniversityCanada

操作系统与Oracle都是重要的系统软件,通过对各自内存和进程管理方式的陈述以及对它们重要特性的比较,指出Oracle给出了清晰的内存与进程的功能视图,便于程序员编写代码;其次Oracle将用户的请求分解为公有和私有部分,且高占比的共享区域... 详细信息

操作系统与Oracle都是重要的系统软件,通过对各自内存和进程管理方式的陈述以及对它们重要特性的比较,指出Oracle给出了清晰的内存与进程的功能视图,便于程序员编写代码;其次Oracle将用户的请求分解为公有和私有部分,且高占比的共享区域,提高了内存在网络环境下的使用效率;第三,Oracle的智能化内存管理使得SGA中的各个组件的内存分配达到最优。最后,操作系统将Oracle的整个SGA直接映射为其虚拟内存,这种类似联邦式的自治管理方式值得借鉴。

关键词：操作系统 Oracle 内存管理进程管理

Special issue on electrochemical energy storage and conversion

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Frontiers in Energy 2024年第2期18卷 125-127页

作者： Yun ZHENG Gaixia ZHANG Sixu DENG Jiujun ZHANG Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Department of Electrical Engineering École de Technologie Supérieure(ÉTS)Universitédu QuébecMontréalH3C 1K3Canada Department of Chemical and Materials Engineering Concordia UniversityMontrealQC H3G 1M8Canada

The escalating global consumption of fossil fuels has significantly elevated the levels of CO_(2)in the atmosphere,leading to an undesirable global energy crisis and environmental *** deployment of renewable energy resources is crucial to mitigate these *** recent years,there has been noteworthy progress in electrochemical energy storage and conversion techniques and devices,including hydrogen energy and fuel cells,advanced energy storage and power batteries,and CO_(2)electrochemical conversion and utilization.

关键词： electrochemical energy elevated

Continuity Adjustment for Control Charts for Attributes

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Acta Mathematicae Applicatae Sinica 2003年第3期19卷 397-404页

作者： L.K.Chan T.K.Mak B.Tao Department of Management Sciences City University of Hong Kong 83 Tat Chee AvenueKowloonHong KongDepartment of Decision Sciences & M.I.S.Concordia University 1445 De Maisonneuve Blvd.WestMontrealH3G 1M8 CanadaAcademy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100081China

A unified approach is proposed for making a continuity adjustment on some control charts for attributes, e.g., np-chart and c-chart, through adding a uniform (0, 1) random observation to the conventional sample statistic (e.g., and c i ). The adjusted sample statistic then has a continuous distribution. Consequently, given any Type I risk α (the probability that the sample statistic is on or beyond the control limits), control charts achieving the exact value of α can be readily constructed. Guidelines are given for when to use the continuity adjustment control chart, the conventional Shewhart control chart (with ±3 standard deviations control limits), and the control chart based on the exact distribution of the sample statistic before adjustment.

关键词： Control charts for attributes continuity adjustments np, p, and c control charts statistical process control

Decentralized fault-tolerant cooperative control of multiple UAVs with prescribed attitude synchronization tracking performance under directed communication topology

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Frontiers of Information Technology & Electronic Engineering 2019年第5期20卷 685-700页

作者： Zi-quan YU Zhi-xiang LIU You-min ZHANG Yao-hong QU Chun-yi SU School of Automation Northwestern Polytechnical University Xi'an 710129 China Department of Mechanical Industrial and Aerospace Engineering Concordia University Montreal QC H3G 1M8 Canada College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 China

In this paper, a decentralized fault-tolerant cooperative control scheme is developed for multiple unmanned aerial vehicles(UAVs) in the presence of actuator faults and a directed communication network. To counteract in-flight actuator faults and enhance formation flight safety, neural networks(NNs) are used to approximate unknown nonlinear terms due to the inherent nonlinearities in UAV models and the actuator loss of control effectiveness faults. To further compensate for NN approximation errors and actuator bias faults, the disturbance observer(DO) technique is incorporated into the control scheme to increase the composite approximation ***, the prediction errors, which represent the approximation qualities of the states induced by NNs and DOs to the measured states, are integrated into the developed fault-tolerant cooperative control scheme. Furthermore,prescribed performance functions are imposed on the attitude synchronization tracking errors, to guarantee the prescribed synchronization tracking performance. One of the key features of the proposed strategy is that unknown terms due to the inherent nonlinearities in UAVs and actuator faults are compensated for by the composite approximators constructed by NNs, DOs, and prediction errors. Another key feature is that the attitude synchronization tracking errors are strictly constrained within the prescribed bounds. Finally, simulation results are provided and have demonstrated the effectiveness of the proposed control scheme.

关键词： Fault-tolerant control Decentralized control Prescribed performance Unmanned aerial vehicle Neural network Distu rbance observer Direc ted topology

硅钨酸掺杂聚苯胺催化合成2-异丙基-1,3-二氧环戊烷

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化学试剂 2007年第10期29卷 577-580,583页

作者：杨水金余协卿 PHILIPPE G.MERLE 湖北师范学院化学与环境工程系湖北黄石435002 Department of Chemistryand Biochemistry Concordia UniversityMontrealCanada

采用回流法自制了硅钨酸(H4SiW12O40)掺杂聚苯胺(PAn)催化剂H4SiW12O40/PAn。通过异丁醛和乙二醇为原料合成标题化合物,探讨了硅钨酸掺杂聚苯胺催化剂对缩醛反应的催化活性,较系统地研究了原料物质的量比、催化剂用量、反应时间诸因素... 详细信息

采用回流法自制了硅钨酸(H4SiW12O40)掺杂聚苯胺(PAn)催化剂H4SiW12O40/PAn。通过异丁醛和乙二醇为原料合成标题化合物,探讨了硅钨酸掺杂聚苯胺催化剂对缩醛反应的催化活性,较系统地研究了原料物质的量比、催化剂用量、反应时间诸因素对产率的影响。实验表明,硅钨酸掺杂聚苯胺催化剂是合成标题化合物的良好催化剂,在n(乙二醇)∶n(异丁醛)=1.5∶1,催化剂用量为反应物料总质量的1.2%,环己烷为带水剂,反应时间1.0h的优化条件下,标题化合物的收率可达88.8%。

关键词： 2-异丙基-1,3-二氧环戊烷硅钨酸聚苯胺催化缩醛反应

Physio-chemical modeling of the NO_(x)-O_(3) photochemical cycle and the air pollutants’ reactive dispersion around an isolated building

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Building Simulation 2023年第9期16卷 1735-1758页

作者： Yunfei Fu Xisheng Lin Xing Zheng Liangzhu Wang Chun-Ho Liu Xuelin Zhang Cruz Y.Li K.T.Tse Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Future Cities Lab Global Singapore-ETH CentreSingapore 138602 Department of Building Civil and Environmental Engineering at Concordia UniversityMontrealQuebecCanada Department of Mechanical Engineering The University of Hong KongPok-fu-lam RoadHong KongChina Department of Civil Engineering Chongqing UniversityChongqingChina School of Atmospheric Sciences Sun Yat-sen UniversityZhuhaiChina

A numerical physio-chemical model of the NO_(x)-O_(3) photochemical cycle in the near-wake region of an isolated residential/office building has been presented in this *** investigation delves into the dispersion of reactive air pollutants through the lens of fluid phenomenology and its impact on chemical reactivity,formation,transport,deposition,and *** fluid dynamics(CFD)simulations were conducted for the ground-point-source(GES)and roof-pointsource(RES)*** show that the Damköhler number(Da),which quantifies pollutants’physio-chemical timescales,displays a strong inverse proportionality with the magnitude and spread of NO–increasing Da reduces human exposure to the toxic NO and NO_(2) *** different wind directions were considered,the dispersion range of NO exhibited varying shrinking directions as Da ***,as Da increases,the concentration ratio KNO_(2)/KNO_(x),which quantifies the production of NO_(2) resulting from NO depletion,forms sharp high-low gradients near emission *** GES,the dispersion pattern is governed by the fluid’s phenomenological *** RES,the intoxicated area emanates from the building’s leading-edge,with the lack of shielding inhibiting pollutant interactions in the near-wake,resulting in scant physio-chemical *** NO_(2)/NO_(x) distribution follows a self-similar,stratified pattern,exhibiting consistent layering gradients and attributing to the natural deposition of the already-reacted pollutants rather than in-situ *** the end,building design guidelines have been proposed to reduce pedestrian and resident exposure to NO_(x)-O_(3).

关键词： reactive pollutant dispersion NO_(x)-O_(3)cycle air pollution isolated building physio-chemical modelling

Impact of ionizers on prevention of airborne infection in classroom

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Building Simulation 2023年第5期16卷 749-764页

作者： Chen Ren Fariborz Haghighat Zhuangbo Feng Prashant Kumar Shi-Jie Cao School of Architecture Southeast University2 SipailouNanjing 210096China Energy and Environment Group Department of BuildingCivil and Environmental EngineeringConcordia UniversityMontrealH3G 1M8Canada Global Centre for Clean Air Research(GCARE) School of SustainabilityCivil&Environmental EngineeringFaculty of Engineering&Physical SciencesUniversity of SurreyGuildford GU27XHSurreyUK Institute for Sustainability University of SurreyGuildford GU27XHSurreyUK

Infectious diseases(e.g.,coronavirus disease 2019)dramatically impact human life,economy and social *** the low-cost and energy-saving approaches is essential in removing infectious virus particles from indoors,such as in *** application of air purification devices,such as negative ion generators(ionizers),gains popularity because of the favorable removal capacity for particles and the low operation ***,small and portable ionizers have potential disadvantages in the removal efficiency owing to the limited horizontal diffusion of negative *** study aims to investigate the layout strategy(number and location)of ionizers based on the energy-efficient natural ventilation in the classroom to improve removal efficiency(negative ions to particles)and decrease infection *** infected students were considered in the *** simulations of negative ion and particle concentrations were performed and validated by the *** showed that as the number of ionizers was 4 and 5,the removal performance was largely improved by combining ionizer with natural *** with the scenario without an ionizer,the scenario with 5 ionizers largely increased the average removal efficiency from around 20%to 85%and decreased the average infection risk by 23%.The setup with 5 ionizers placed upstream of the classroom was determined as the optimal layout strategy,particularly when the location and number of the infected students were *** work can provide a guideline for applying ionizers to public buildings when natural ventilation is used.

关键词： classroom infection risk ionizer negative ions removal efficiency

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非工业建筑中的VOC污染研究状况与进展

非工业建筑中的VOC污染研究状况与进展