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A new design approach for the established flow region of vertical,dilute-phase pneumatic conveyors

Particuology 2022年第7期20卷 10-20页

作者： John M.Wheeldon Jan Baeyens Shuo Li Yimin Deng European Powder and Process Technology Longfellow DriveKetteringUnited Kingdom KU Leuven Department of Chemical EngineeringProcess and Environmental Technology LabJ.De Nayerlaan 52860 Sint-Katelijne-WaverBelgium Beijing University of Chemical Technology Beijing Advanced Centre of Smart Matter Science and EngineeringBeijingChina

An analysis has been completed for a comprehensive set of vertical,dilute-phase pneumatic conveying pressure drop data from an investigation by *** data were collected in the established flow region for eight different materials conveyed in 0.05-,0.10-,0.20-m internal diameter,20-m tall steel *** velocities derived from the pressure drop data were used to develop an equation of motion that includes terms for pipe diameter,terminal velocity,coefficient of restitution,and particle *** best data fit was achieved using the actual gas density and the actual gas velocity adjusted for *** the terminal velocity for voidage,an approach recommended by many investigators,did not improve the fit for reasons identified by the present *** the equation of motion,particle velocities were predicted and used to calculate total pressure drops that are within±15%of the measured *** calculated values also produce the characteristic trough-shaped total pressure drop curves allowing the minimum pressure drop gas velocity to be determined without recourse to a separate correlation.A comparison with other studies using shorter risers indicates that data from these studies likely include acceleration effects.A separate study will investigate this observation further.

关键词： Dilute-phase Vertical Pneumatic conveying Design equations Pressure drops

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In situ formed ultrafine metallic Ni from nickel(Ⅱ) acetylacetonate precursor to realize an exceptional hydrogen storage performance of MgH_(2)-Ni-EG nanocomposite

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Journal of Magnesium and Alloys 2023年第9期11卷 3174-3185页

作者： Shaoyang Shen Liuzhang Ouyang Jiangwen Liu Hui Wang Xu-Sheng Yang Min Zhu School of Materials Science and Engineering and Key Laboratory of Advanced Energy Storage Materials of Guangdong Province South China University of TechnologyGuangzhou510641China China-Australia Joint Laboratory for Energy&Environmental Materials Key Laboratory of Fuel Cell Technology of Guangdong ProvinceGuangzhouGuangzhou510641China Advanced Manufacturing Technology Research Centre Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

It has been well known that doping nano-scale catalysts can significantly improve both the kinetics and reversible hydrogen storage capacity of MgH_(2) . However, so far it is still a challenge to directly synthesize ultrafine catalysts(e.g., < 5 nm), mainly because of the complicated chemical reaction processes. Here, a facile one-step high-energy ball milling process is developed to in situ form ultrafine Ni nanoparticles from the nickel acetylacetonate precursor in the MgH_(2) matrix. With the combined action of ultrafine metallic Ni and expanded graphite(EG), the formed MgH_(2)-Ni-EG nanocomposite with the optimized doping amounts of Ni and EG can still release 7.03 wt.% H_(2) within 8.5 min at 300 ℃ after 10 cycles. At a temperature close to room temperature(50 ℃), it can also absorb 2.42 wt.% H_(2) within 1 h. It can be confirmed from the microstructural characterization analysis that the in situ formed ultrafine metallic Ni is transformed into Mg_(2)Ni/Mg_(2)NiH_4 in the subsequent hydrogen absorption and desorption cycles. It is calculated that the dehydrogenation activation energy of the MgH_(2)-Ni-EG nanocomposite is also reduced obviously in comparison with the pure MgH_(2) . Our work provides a methodology to significantly improve the hydrogen storage performance of MgH_(2) by combining the in situ formed and uniformly dispersed ultrafine metallic catalyst from the precursor and EG.

关键词： Hydrogen storage Magnesium hydride Nickel precursor Size effect Expanded graphite

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Vertical graphene-decorated carbon nanofibers establishing robust conductive networks for fiber-based stretchable strain sensors

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Journal of Materials Science & technology 2024年第33期200卷 52-60页

作者： Hyeon-Jong Lee Seung Chan Na TaeGyeong Lim Jeongmin Yun Yonas Tsegaye Megra Ji-Hyun Oh Wonyoung Jeong Daeyoung Lim Ji Won Suk School of Mechanical Engineering Sungkyunkwan UniversitySuwonGyeonggi-do 16419Republic of Korea Department of Smart Fab.Technology Sungkyunkwan UniversitySuwonGyeonggi-do 16419Republic of Korea Department of Clothing and Textiles Changwon National UniversityChangwonGyeongsangnam-do51140Republic of Korea Material and Component Convergence R&D Department Korea Institute of Industrial Technology(KITECH)AnsanGyeonggi-do 15588Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwonGyeonggi-do 16419Republic of Korea

Stretchable strain sensors have great potential for diverse applications including human motion detection,soft robotics,and health ***,their practical implementation requires improved repeatability and stability along with high sensing ***,we utilized spiky vertical graphene(VG)sheets decorated on carbon nanofibers(VG@CNFs)to establish reliable conductive networks for resistive strain ***-dimensional(3D)VG@CNFs combined with reduced graphene oxide(rGO)sheets were simply coated on stretchable spandex fibers by *** of the spiky geometry of the VG sheets,VG@CNF and rGO exhibited enhanced interactions,which was confirmed by mode I fracture *** to the robust conductive networks formed by the VG@CNF and rGO hybrid,the fiber strain sensor exhibited a significantly improved strain range of up to 522%(with a high gauge factor of 1358)and stable resistance changes with minimal variation even after 5000 stretching–releasing cycles under a strain of 50%.In addition,the textile strain sensor based on the VG@CNF/rGO hybrid showed even improved repeatability for various strain levels of 10%to 200%,enabling its implementation on leggings for monitoring of squat *** study demonstrates the high potential of the 3D VG@CNF for high-performance and reliable stretchable strain sensors.

关键词： Stretchable strain sensor Vertical graphene Reduced graphene oxide Carbon nanofiber Human motion detection

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Triple the steady-state reaction rate by decorating the In_(2)O_(3)surface with SiO_(x)for CO_(2)hydrogenation

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Journal of Energy Chemistry 2024年第8期95卷 96-105,I0003页

作者： Hao Wang Chun Yang Xiaoyan Yu Mingrui Wang Runze Yang Xiaowa Nie Ben Hang Yin Alex C.K.Yip Chunshan Song Guanghui Zhang Xinwen Guo State Key Laboratory of Fine Chemicals Frontier Science Center for Smart MaterialsPSU-DUT Joint Center for Energy ResearchSchool of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina Department of Chemistry the Chinese University of Hong KongHong Kong 999077China Paihau-Robinson Research Institute the MacDiarmid Institute for Advanced Materials and NanotechnologyVictoria University of WellingtonWellington 6012New Zealand Department of Chemical and Process Engineering The University of CanterburyChristchurch 8041New Zealand

Indium oxide(In_(2)O_(3)),as a promising candidate for CO_(2)hydrogenation to C_(1) products,often suffers from sintering and activity decline,closely related to the undesirable structural evolution under reaction *** on the comprehension of the dynamic evolution,this study presents an efficient strategy to alleviate the agglomeration of In_(2)O_(3)nanoparticles by the surface decoration with highly dispersed silica species(SiO_(x)).Various structural characterizations combined with density functional theory calculations demonstrated that the sintering resulted from the over-reduction,while the enhanced stability originated from the anchoring effect of highly stable In-OSi bonds,which hinders the substantial formation of metallic In(In^(0))and the subsequent agglomeration.0.6Si/In_(2)O_(3)exhibited CO_(2)conversion rate of10.0 mmol g^(-1)h^(-1)at steady state vs.3.5 mmol g^(-1)h^(-1)on In_(2)O_(3)in CO_(2)*** steady-state activity was also achieved on Pd-modified *** to the traditional Pd/In_(2)O_(3)catalyst,the methanol production rate of Pd catalyst supported on 0.6Si/In_(2)O_(3)was enhanced by 23%,showing the potential of In_(2)O_(3)modified by SiO_(x)in serving as a platform *** work provides a promising method to design new In_(2)O_(3)-based catalysts with improved activity and stability in CO_(2)hydrogenation.

关键词： CO_(2)hydrogenation In_(2)O_(3)sintering Dynamic structural evolution Surface SiO_(x)modification DFT simulations

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Recent advances and perspectives for Zn-based batteries:Zn anode and electrolyte

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Nano Research Energy 2023年第1期2卷 9-27页

作者： Huaiyun Ge Xilan Feng Dapeng Liu Yu Zhang Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry Beihang UniversityBeijing 100191China Department of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China

Zn-based batteries have attracted extensive attention due to their high theoretical energy density,safety,abundant resources,environmental friendliness,and low *** are a new energy storage and conversion technology with significant development potential and have been widely used in renewable energy and portable electronic *** attempts have been devoted to improving the performance of Zn-based ***,battery cycle life and energy efficiency can be improved by electrolyte modification and the construction of highly efficient rechargeable Zn *** review compiles the progress of the research related to Zn anodes and electrolytes,especially in the last five *** review will introduce fundamental concepts,summarize recent development,and inspire further systematic research for high-performance Zn-based batteries in the future.

关键词： Zn-air/ion batteries Zn anode stripping/plating surface modification growth control electrolyte cycle life

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A Predictive Economic Analysis Under Uncertain Scenario: Evidence Theory for Small-Scale Residential Community Power Network 6

A Predictive Economic Analysis Under Uncertain Scenario: Evi...

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6th International Conference on Electrical, Control and Instrumentation engineering, ICECIE 2024

作者： Saini, Vikash Kumar Al-Sumaiti, Ameena S. Kumar, Rajesh Khalifa University Smart OR Lab Advanced Power and Energy Center Department of Electrical Engineering United Arab Emirates Malaviya National Institute of Technology Jaipur RAMAN Lab Department of Electrical Engineering India University of Johannesburg Faculty of Health Sciences Department of Human Anatomy and Physiology Johannesburg South Africa

ISBN: (纸本)9798350380040

Residential communities increasingly adopt renewable energy sources (RES) to reduce energy costs. However, these sources are weather-dependent and unpredictable, posing challenges for reliable operations. Therefore, managing uncertainties in power supply has become an important research focus. These uncertainties directly affect the performance of microgrids. Energy storage systems are integral, enabling battery-backed supply for residential loads during unpredictable conditions. This paper presents an evidence-based fusion framework for accurate load and PV power forecasting in uncertain scenarios. Dempster-Shaffer's theory has been used to develop a fusion framework. In addition, electricity network modeling for a day-long electricity cost analysis of a residential community has been done in three scenarios. In scenario 1, the community power supply is connected to the grid;in Scenario 2, users have a PV system on their premises but no storage;and in Scenario 3, users have their own PV-integrated storage system. The electricity price for buying and selling energy from the grid is also assumed to be fixed. The primary objective of this framework is to minimize the operating cost under a set of different constraints. The results showed that the prediction performance of the proposed algorithm is better than others. Thus, under uncertainty, scenario 3 is more economical than the other two, and the total cost with the proposed algorithm is less than 0.705 in scenario 1 and less than 0.339 in scenario 2. © 2024 IEEE.

关键词： Dempster-Shaffer's theory Energy Storage Load forecasting Microgrids Renewable Energy Forecasting

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Lightweight PPy aerogel adopted with Co and SiO_(2) nanoparticles for enhanced electromagnetic wave absorption

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Journal of Materials Science & technology 2022年第2期97卷 213-222页

作者： Haicheng Wang Huating Wu Huifang Pang Yuhua Xiong Shuwang Ma Yuping Duan Yanglong Hou Changhui Mao State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous MetalsBeijing 100088and GRIMAT Engineering Institute Co.Ltd.Beijing 101402China School of Materials Science and Engineering Dalian University of TechnologyDalian 116085China Beijing Key Laboratory for Magnetoelectric Materials and Devices(BKLMMD) Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT)Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China

Lightweight nanocomposites consisting of magnetic and dielectric units aroused intensive interest as potential high performance electromagnetic wave absorbing *** this work,we report a facile and efficient method to fabricate(Co,SiO_(2))/PPy composites with tunable electromagnetic *** absorbing properties and effective absorbing bandwidth can be regulated by controlling the content of SiO_(2) in *** composite shows a maximum reflection loss(RL)of-65.31 d B at 11.12 GHz with a thickness of 3.002 mm when SiO_(2) being 22 wt.%.The effective absorbing bandwidth reaches up to 5.1 GHz(8.91-14.01 GHz),which covers the entire X band(8-12 GHz).The improved impedance matching,high interfacial polarization and complex electromagnetic synergy in the composites are the key factors giving rise to the higher efficient *** PPy aerogel-based nanocomposites with controllable absorption performance,lower density and strong environmental adaptability will become attractive candidates as advanced microwave absorbing materials.

关键词： Lightweight nanocomposites PPy aerogel Electromagnetic wave absorbing Impedance matching Electromagnetic synergy

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Understanding of the Relationship between the Properties of Cu(In,Ga)Se_(2) Solar Cells and the Structure of Ag Network Electrodes

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Energy & Environmental Materials 2024年第6期7卷 246-253页

作者： Hyesun Yoo Hoang Van Quy Inpyo Lee Seung Taek Jo Tae Ei Hong JunHo Kim Dae-Hwang Yoo Jinwook Shin Walter Commerell Dae-Hwan Kim Jong Wook Roh Regional Leading Research Center(RLRC)of Smart Energy System Kyungpook National UniversityGyeongsangbuk-do 37224Korea Division of Energy Technology DaeguGyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Korea Department of Hydrogen and Renewable Energy Kyungpook National UniversityDaegu 47922Korea Nano Photoelectronic Device Lab Department of PhysicsIncheon National UniversityIncheon 22012Korea Institute for Energy and Drive Technology Technische Hochschule Ulm(THU)Ulm 89081Germany Department of Nano&Advanced Materials Science and Engineering Kyungpook National UniversityGyeongsangbuk-do 37224Korea

The relation between the structure of the silver network electrodes and the properties of Cu(In,Ga)Se_(2)(CIGS)solar cells is systemically *** Ag network electrode is deposited onto an Al:ZnO(AZO)thin film,employing a self-forming cracked *** control over the cracked template's structure is achieved through careful adjustment of temperature and *** Ag network electrodes with different coverage areas and network densities are systemically applied to the CIGS solar *** is revealed that predominant fill factor(FF)is influenced by the figure of merit of transparent conducting electrodes,rather than sheet resistance,particularly when the coverage area falls within the range of 1.3–5%.Furthermore,a higher network density corresponds to an enhanced FF when the coverage areas of the Ag networks are *** utilizing a thinner AZO film,CIGS solar cells with a surface area of 1.0609 cm^(2)exhibit a notable performance improvement,with efficiency increasing from 10.48%to 11.63%.This enhancement is primarily attributed to the increase in FF from 45%to 65%.These findings underscore the considerable potential for reducing the thickness of the transparent conductive oxide(TCO)in CIGS modules with implications for practical applications in photovoltaic technology.

关键词： CIGS large-area solar cell metal mesh metallic network transparent electrode

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An in situ dressing material containing a multi-armed antibiotic for healing irregular wounds

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Aggregate 2024年第3期5卷 248-257页

作者： Ruihua Dong Mian Chen Yuexiao Jia Hao Tang Ziyin Xiong Yunze Long Xingyu Jiang Shenzhen Key Laboratory of Smart Healthcare Engineering Guangdong Provincial Key Laboratory of Advanced BiomaterialsDepartment of Biomedical EngineeringSouthern University of Science and TechnologyShenzhenP.R.China School of Rehabilitation Sciences and Engineering University of Health and Rehabilitation SciencesQingdaoP.R.China Collaborative Innovation Center for Nanomaterials and Devices College of PhysicsQingdao UniversityQingdaoP.R.China

Acute and infected wounds resulting from accidents,battlefield trauma,or surgical interventions have become a global healthcare burden due to the complex bacterial infection ***,conventional gauze dressings present insufficient contact with irregular wounds and lack antibacterial activity against multi-drug-resistant *** this study,we develop in situ nanofibrous dressings tailored tofit wounds of various shapes and sizes while providing nanoscale comfort and excellent antibacterial *** approach involves the fabrication of these dressings using a handheld electrospinning device that allows for the direct depo-sition of nanofiber dressings onto specific irregular wound sites,resulting in perfect conformal wound closure without any mismatch in 2 *** nanofibrous dressings are loaded with multi-armed antibiotics that exhibit outstanding antibacterial activ-ity against Staphylococcus aureus(***)and methicillin-resistant *** to conventional vancomycin,this in situ nanofibrous dressing shows great antibacterial performance against up to 98%of multi-drug-resistant *** vitro and in vivo experiments demonstrate the ability of in situ nanofibrous dressings to prevent multi-drug-resistant bacterial infection,greatly alleviate inflammation,and promote wound *** highlight the potential of these personalized nanofibrous dressings for clinical applications,including emergency,accident,and surgical healthcare treatment.

关键词： deposited nanofibrous dressing multi-armed antibiotics personalized healthcare portable electrospin-ning device

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Review of IoT and electronics enabled smart agriculture

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International Journal of Agricultural and Biological engineering 2024年第5期17卷 1-14页

作者： Narayan Raosaheb Gatkal Sachin Madhukar Nalawade Ramesh Kumar Sahni Girishkumar Balasaheb Bhanage Avdhoot Ashok Walunj Pravin Bhaskar Kadam Musrrat Ali Department of Farm Machinery and Power Engineering Dr.Annasaheb Shinde College of Agricultural Engineering and TechnologyMahatma Phule Krishi VidyapeethRahuri 413722MaharashtraIndia Central Institute of Agricultural Engineering Bhopal 462038Madya PradeshIndia Centre for Advanced Agricultural Science and Technology for Climate Smart Agriculture and Water Management(CAAST-CSAWM) Dr.Annasaheb Shinde College of Agricultural Engineering and TechnologyMahatma Phule Krishi VidyapeethRahuri 413722AhmednagarMaharashtraIndia Department of Mathematics and Statistics College of ScienceKing Faisal UniversityAl-Ahsa 31982Saudi Arabia

The population increases at an exponential rate as human society advances,and pollution is increasingly depleting the availability of resources such as water and *** these problems are thought to require the use of smart *** reducing use of chemical fertilizers and pesticides,smart agriculture could mitigate land pollution and increase the sustainability of agricultural practices while also greatly enhancing the agro-ecological environment,yield,and quality of *** steps to make agriculture smart are made possible through data and communication technology,which helps with automatic operation and ***,advances in wireless communication protocols will bring agriculture to a more intelligent *** study provides an overview of IoT technology and its application in the smart agriculture industry to make crop production automatic and intelligent by assessing their architecture(IoT devices,communication technologies,and processing),their applications,and research *** communication protocols that have established uses in agriculture are reviewed first in this *** wireless communication protocols such as WiFi,ZigBee,SigFox,LoRa,RFID,NFMI,Terahertz,and NB-IoT were summarized,and their applications in various fields were also *** protocols in smart agriculture can effectively and efficiently address environmental data,water saving,monitoring of animal behavior,accuracy,power efficiency,cost reduction due to low power consumption,accuracy,wide transmission,simple in operation and cost *** most commonly used microcontrollers are Arduino(to develop autonomous machines),Raspberry Pi(to store data),and 8-bit microcontroller(to process data).In addition,it is important to take advantage of modern communication technology to enhance crop *** study also examines the future opportunities and trends for IoT applications in smart agriculture,along with the ongoing challenges and issues that n

关键词： IoT smart agriculture microcontroller sensor SigFox LoRa ZigBee

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