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A new approach of using Lorentz force to study single-asperity friction inside TEM

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Journal of Materials Science & Technology 2021年第25期84卷 43-48页

作者： Huanhuan Lu Zhangjie Wang Di Yun Ju Li Zhiwei Shan Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano)and Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an710049People’s Republic of China School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an710049People’s Republic of China department of Nuclear Science and Engineering and department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA02139USA

Taking advantage of the magnetic field inside transmission electron microscope(TEM),a unique Lorentzforce-actuated method for quantitative friction tests was developed via a commercial electromechanical *** this approach,a submicron-sized silver asperity sliding on a tungsten flat punch was actuated by Lorentz force due to electrical current through the punch,with the normal force imposed by the built-in transducer of the *** friction force was determined by tracking the elastic deflection of the fabricated cantilever from in situ *** correlating the friction behavior with the microstructural evolution near the silver-tungsten interface,we revealed that even when the relative motion commenced with the plastic deformation of the silver asperity,the interface can still sustain the further increasing static friction *** following the arrival of the maximum static friction force,the sliding occurred at the interface,indicating the transition from static to dynamic *** work enriches our understanding of the underlying physics of the dynamic friction process for metallic friction behavior.

关键词： friction deformation silver

Ion shielding functional separator using halloysite containing a negative functional moiety for stability improvement of Li–S batteries

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Journal of Energy Chemistry 2021年第9期30卷 334-340页

作者： Yong Min Kwon Jihoon Kim Kuk Young Cho Sukeun Yoon Division of Advanced Materials Engineering&Institute for Rare Metals Kongju National UniversityChungnam 31080Republic of Korea department of Materials Science and Chemical Engineering Hanyang UniversityGyeonggi 15588Republic of Korea

Lithium–sulfur batteries are one of the attractive next-generation energy storage systems owing to theienvironmental friendliness,low cost,and high specific energy ***,the low electrical conductivity of sulfur,shuttling of soluble intermediate polysulfides between electrodes,and low capacitretention have hampered their commercial *** address these issues,we use a halloysitemodulated(H-M)separator in a lithium–sulfur battery to mitigate the shuttling *** H-M separator acts as a mutual Coulombic repulsion in lithium-sulfur batteries,thereby selectively permitting Lions and efficiently suppressing the transfer of undesired lithium polysulfides to the Li anode sideMoreover,the use of halloysite switches the surface of the separator from hydrophobic to hydrophilicconsequently improving the electrolyte wettability and adhesion between the separator and cathodeWhen sulfur-multi-walled carbon nanotube(S-MWCNT)composites are used as cathode active materialsa lithium–sulfur battery with an H-M separator exhibits first discharge and charge capacities of 1587 an1527 m Ah g-1,***,there is a consistent capacity retention up to 100 cyclesAccordingly,our approach demonstrates an economical and easily accessible strategy for commercialization of lithium–sulfur batteries.

关键词： Li–S batteries Halloysite Ion shielding Negative functional moiety Lithium polysulfides

Investigations and prospects of Fabry-Perot antennas:a review

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Journal of Systems Engineering and Electronics 2021年第4期32卷 731-747页

作者： LIU Zhiming BORNEMANN Jens LIU Shaobin KONG Xiangkun department of Electrical and Computer Engineering University of VictoriaVictoria V8W 2Y2Canada College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Fabry-Perot(FP)antennas have characteristics of planar structures combined with high gain,and they have been widely used in wireless *** the progress of ongoing research,FP antennas have achieved various capabilities,but many of them are still under development,such as lowprofile,wideband,circular polarization,multi-band,low-radar cross section(RCS)and reconfigurable *** paper discusses the theoretical analysis methods and research progress of FP antennas,and explains the realization methods of different features of FP *** order to indicate different technologies for realizing various capabilities,the key technologies and features of some of the latest designs are ***,the research situation and prospects of FP antennas are summarized to guide their research directions in the future.

关键词： Fabry-Perot(FP)antenna partially reflective surface research situation research direction

Occupational Hazards, Safety and Hygienic Practices among timber Workers in a South Eastern State, Nigeria

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Occupational Diseases and Environmental Medicine 2016年第3期4卷 63-71页

作者： Kevin C. Diwe Chukwuma B. Duru Anthony C. Iwu Irene A. Merenu Kenechi A. Uwakwe Uche R. Oluoha Tope B. Ogunniyan Ugochukwu C. Madubueze Ikechi Ohale department of Community Medicine Imo State University Owerri Nigeria department of Community Medicine Imo State University Teaching Hospital Orlu Nigeria department of Community Medicine University College Hospital Ibadan Nigeria department of Community Medicine Federal Teaching Hospital Abakaliki Nigeria

Background: timber workers, especially in developing countries, are faced with challenges of prevention and control of work place hazards and illnesses. Objective: To determine the awareness of occupational hazards, effects, safety and hygienic practices among timber workers in a South Eastern State in Nigeria. Methods: A cross sectional descriptive design that used the total population of timber workers involved in the processing and marketing of wood in three major timber markets in a South Eastern State in Nigeria. Data was collected using a pretested semistructured questionnaire. Descriptive analyses were done with frequencies and summary statistics. Results: The majority of the respondents were aware of the hazardous nature of wood dust (96%) and their main source of awareness was from personal experiences (55%). In spite of the fact that the predominant hazard effects in the majority were nose, throat irritation and cough (33%), the majority were of the opinion that the respirator was not important. Only 13% of the respondents that use personal protective equipment (PPE) always use them and the main reason for not using PPE is forgetfulness (38%). Proper hygiene and sanitation was poorly practiced, as all respondents indiscriminately disposed of waste wood (100%) and about one third (33%) did not have a bath after work each day. Conclusion: timber workers in our environment are faced with increased risks of diseases, accidents and challenges of protection and safety. As a consequence, there is a need for proper education and enforcement of consistent use of the different protective devices.

关键词： Knowledge Attitude Practice Occupational Hazard timber Worker Imo Nigeria

Development of Eco-Friendly Deconstruction technologies for Recycling Construction Waste

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Journal of Environmental Protection 2014年第7期5卷 647-661页

作者： Myungkwan Lim Heesup Choi Hyeonggil Choi Ryoma Kitagaki Takahumi Noguchi department of Architecture The University of Tokyo Tokyo Japan department of Archtecture Engineering Hankyong National University Gyeonggi-do Korea

Recently, the intended use and required performance of buildings are rapidly changing with advances in scientific technology and globalization. Furthermore, given the population growth in semi-developed and developing countries, economic growth, increasing waste, and increasing amounts of energy consumption, the industry requires the development of efficient methods to deconstruct old buildings by reducing waste and saving as much energy as possible during periods of urban redevelopment and maintenance. In general, either an ordinary breaker or a hydraulic breaker is used to deconstruct reinforced concrete buildings. This deconstruction method has the ability to shorten the construction period compared to the other methods, but it is difficult to separate the debris that gets mixed when the deconstruction is completed, as it is a rough construction method that uses large equipment. This study develops a technology that can be used to selectively heat, separate, and deconstruct the steel reinforcement inside reinforced concrete, treating the reinforcement as a conductive resistor and applying high-frequency induction heating to the reinforced concrete structure. Specifically, this study verifies the temperature characteristics of deformed bars inside reinforced concrete, the occurrence of cracks due to thermal fracture of the deformed bars, and chemical and physical weakening of concrete by thermal conduction on the surface of steel reinforcement using the high-frequency induction heating technology. Furthermore, this study considers the extent of concrete weakening in the heating range of appropriate energy and carries out a technical review of the stages that would be actually applied. This technology involves low noise and low pollution levels, and it increases the collection rate of steel reinforcement inside separated reinforced concrete members and the recycling rate of construction wastes;thus, its use is expected to reduce the energy consumption by minimizing

关键词： Recycling Deconstruction Heat Induction Ease to Scrap Weakening

Digital Twins in industry5.0

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Research 2023年第3期2023卷 1-16页

作者： Zhihan Lv department of Game Design Faculty of ArtsUppsala UniversityUppsalaSweden

This work aims to explore the impact of Digital Twins Technology on industrial manufacturing in the context of industry 5.0.A computer is used to search the Web of Science database to summarize the Digital Twins in industry ***,the background and system architecture of industry 5.0 are ***,the potential applications and key modeling technologies in industry 5.0 are *** is found that equipment is the infrastructure of industrial scenarios,and the embedded intelligent upgrade for equipment is a Digital Twins primary *** the same time,Digital Twins can provide automated real-time process analysis between connected machines and data sources,speeding up error detection and *** addition,Digital Twins can bring obvious efficiency improvements and cost reductions to industrial *** Twins reflects its potential application value and subsequent potential value in industry 5.0 through the *** is hoped that this relatively systematic overview can provide technical reference for the intelligent development of industrial manufacturing and the improvement of the efficiency of the entire business process in the Industrial X.O era.

关键词： value intelligent subsequent

Wavelength stability in a hybrid photonic crystal laser through controlled nonlinear absorptive heating in the reflector

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Light(Science & Applications) 2018年第1期7卷 654-660页

作者： Andrei P.Bakoz Alexandros A.Liles Alfredo A.Gonzalez-Fernandez Tatiana Habruseva Changyu Hu Evgeny A.Viktorov Stephen P.Hegarty Liam O’Faolain Centre for Advanced Photonics and Process Analysis&department of Physical Sciences Cork Institute of TechnologyCork T12P928Ireland Tyndall National Institute University College CorkLee MaltingsDyke ParadeCork T12R5CPIreland School of Physics&Astronomy University of St AndrewsNorth HaughSt Andrews KY169SSUK National Research University of Information technologies Mechanics and OpticsSaint Petersburg 199034Russia IMEC Department of Information Technology(INTEC)Photonics Research GroupGhent UniversityTechnologiepark-Zwijnaarde 159052 GhentBelgium National Institute of Astrophysics Optics and Electronics72840 TonantzintlaMexico

The need for miniaturized,fully integrated semiconductor lasers has stimulated significant research efforts into realizing unconventional configurations that can meet the performance requirements of a large spectrum of applications,ranging from communication systems to *** demonstrate a hybrid,silicon photonicscompatible photonic crystal(PhC)laser architecture that can be used to implement cost-effective,high-capacity light sources,with high side-mode suppression ratio and milliwatt output output *** emitted wavelength is set and controlled by a silicon PhC cavity-based reflective filter with the gain provided by a Ⅲ–Ⅴ-based reflective semiconductor optical amplifier(RSOA).The high power density in the laser cavity results in a significant enhancement of the nonlinear absorption in silicon in the high Q-factor PhC *** heat generated in this manner creates a tuning effect in the wavelength-selective element,which can be used to offset external temperature fluctuations without the use of active *** approach is fully compatible with existing fabrication and integration technologies,providing a practical route to integrated lasing in wavelength-sensitive schemes.

关键词： amplifier tuning nonlinear

Early faults prediction of running state of electromechanical systems and reconfigurable integration of series safety monitoring systems

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仪器仪表学报 2014年第S2期35卷 224-232页

作者： Xu Xiaoli Zuo Yunbo Chen Tao Liu Xiuli Chen Shanpeng Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science and Technology University School of Mechanical and Vehicle Engineering Beijing Institute of Technology department of Environmental Science and Engineering Faculty of Bioresources Mie University

Fault prediction technology of running state of electromechanical systems is one of the key technologies that ensure safe and reliable operation of electromechanical equipment in health state. For multiple types of modern, high-end and key electromechanical equipment, this paper will describe the early faults prediction method for multi-type electromechanical systems, which is favorable for predicting early faults of complex electromechanical systems in non-stationary, nonlinear, variable working conditions and long-time running state; the paper shall introduce the reconfigurable integration technology of series safety monitoring systems based on which the integrated development platform of series safety monitoring systems is built. This platform can adapt to integrated R&D of series safety monitoring systems characterized by high technology, multiple species and low volume. With the help of this platform, series safety monitoring systems were developed, and the Remote Network Security Monitoring Center for Facility Groups was built. Experimental research and engineering applications show that: this new fault prediction method has realized the development trend features extraction of typical electromechanical systems, multi-information fusion, intelligent information decision-making and so on, improving the processing accuracy, relevance and applicability of information; new reconfigurable integration technologies have improved the integration level and R&D efficiency of series safety monitoring systems as well as expanded the scope of application; the series safety monitoring systems developed based on reconfigurable integration platform has already played an important role in many aspects including ensuring safety operation of equipment, stabilizing product quality, optimizing running state, saving energy consumption, reducing environmental pollution, improving working conditions, carrying out scientific maintenance, advancing equipment utilization, saving mainten

关键词： electromechanical systems early faults safety control monitoring systems reconfigurable integration

Whole-system thinking, development control, key barriers and promotion mechanism for EV development

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 160-169页

作者： Chunlin GUO Ching Chuen CHAN State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina department of EEE University of Hong KongHong KongChina

Electric vehicles(EVs)have received significant attention because of the potential energy savings and emission reductions they ***,current studies and demonstrations have focused mainly on specific technologies and equipment types,which cannot in themselves solve the predicaments facing *** study points out that EVs will form a large,complex system that needs to be optimized over different aspects to compete with traditional ***,wholesystem thinking is needed to support the development control of EVs,with a broader scope than operational control,and the core issue is the interaction between EVs and power grid,including their coordinated development and operational *** development control of EVs,a target system and a step-wise optimization method are presented,as well as the basic principles for designing the target *** are two key barriers in EVs’development:the research and mass production of highperformance power batteries,and the formulation of a favorable mechanism to capture benefits and encourage *** address the problems of EV development,a promotion method that combines franchising with moderate competition is *** concepts and methods developed in this study can facilitate the research and development of EVs.

关键词： Electric vehicles Charging infrastructure Whole-system thinking Key barrier Development route