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Thin paints for durable and scalable radiative cooling

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Journal of Energy Chemistry 2024年第3期90卷 176-182,I0006页

作者： Shanquan Liu Fei Zhang xingyu chen Hongjie Yan Wei chen Meijie chen School of Energy Science and Engineering Central South UniversityChangsha 410083HunanChina School of Intelligent Manufacturing Ecosystem Xi'an Jiaotong-Liverpool UniversitySuzhou 215400JiangsuChina

Passive daytime radiative cooling(PDRC) is environment-friendly without energy input by enhancing the coating's solar reflectance(R_(solar)) and thermal emittance(ε_(LWIR)) in the atmosphere's long-wave infrared transmission ***,high R_(solar) is usually achieved by increasing the coating's thickness,which not only increases materials' cost but also impairs heat ***,the desired high R_(solar) is vulnerable to dust pollution in the *** this work,a thin paint was designed by mixing hBN plates,PFOTS,and IPA. R_(solar)=0.963 and ε_(LWIR)=0.927 was achieved at a thickness of 150 μm due to the high backscattering ability of scatters.A high through-plane thermal conductivity(~1.82 W m^(-1) K^(-1)) also can be *** addition,the porous structure coupled with the binder PFOTS resulted in a contact angle of 154°,demonstrating excellent durability under dust *** experiments showed that the thin paint can obtain a 2.3℃ lower temperature for sub-ambient cooling than the reference PDRC coating in the ***,the above-ambient heat dissipation performance can be enhanced by spraying the thin paint on a 3D heat sink,which was 15.7℃ lower than the reference 1D structure,demonstrating excellent performance for durable and scalable PDRC applications.

关键词： Radiative cooling Heat dissipation Solar reflectance Thermal emittance Contact angle

Energy Analysis of a CPG-controlled Miniature Robotic Fish

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Journal of Bionic Engineering 2018年第2期15卷 260-269页

作者： Junzhi Yu Shifeng chen Zhengxing Wu xingyu chen Ming Wang State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China School of lnformation and Electrical Engineering Shandong Jianzhu University Jinan 250101 China

Bionic robotic fish has a significant impact on design and control of innovative underwater robots capable of both rapid swimming and high maneuverability. This paper explores the relationship between Central Pattern Generator （CPG） based locomotion control and energy consumption of a miniature self-propelled robotic fish. To this end, a real-time energy measurement system compatible with the CPG-based locomotion control is firstly built on an embedded system. Then, tests are conducted on the untethered actual robot. The results indicate that different CPG feature parameters involving amplitude, frequency, and phase lag play distinct roles in energy consumption under different swimming gaits. Specifically, energy consumption is positively correlated with the changes in the amplitude and frequency of CPGs, whereas the phase lag of CPGs has little influence on the energy consumption. It may offer important inspiration for improving energy efficiency and locomotion performance of versatile swimming gaits.

关键词： bionic robotic fish energy analysis Central Pattern Generator (CPG) swimming motion control

Crowdsourcing RTK:a new GNSS positioning framework for building spatial high-resolution atmospheric maps based on massive vehicle GNSS data

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Satellite Navigation 2024年第1期5卷 91-108页

作者： Hongjin Xu xingyu chen Jikun Ou Yunbin Yuan State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and Technology(APM)Chinese Academy of Sciences(CAS)Wuhan430071China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina

High-quality spatial atmospheric delay correction information is essential for achieving fast integer ambiguity resolution(AR)in precise ***,traditional real-time precise positioning frameworks(i.e.,NRTK and PPP-RTK)depend on spatial low-resolution atmospheric delay correction through the expensive and sparsely distributed CORS *** results in limited public *** the mass production of autonomous driving vehicles,more cost-effective and widespread data sources can be explored to create spatial high-resolution atmospheric *** this study,we propose a new GNSS positioning framework that relies on dual base stations,massive vehicle GNSS data,and crowdsourced atmospheric delay correction maps(CAM).The map is easily produced and updated by vehicles equipped with GNSS receivers in a crowd-sourced ***,the map consists of between-station single-differenced ionospheric and tropospheric *** introduce the whole framework of CAM initialization for individual vehicles,on-cloud CAM maintenance,and CAM-augmented user-end *** map data are collected and preprocessed in ***,the crowdsourced data are uploaded to a cloud *** massive data from multiple vehicles are merged in the cloud to update the CAM in ***,the CAM will augment the user positioning *** framework forms a beneficial cycle where the CAM’s spatial resolution and the user positioning performance mutually improve each *** validate the performance of the proposed framework in real-world experiments and the applied potency at different spatial *** highlight that this framework is a reliable and practical positioning solution that meets the requirements of ubiquitous high-precision positioning.

关键词： New GNSS positioning framework Spatial high-resolution atmospheric delay correction Crowdsourced atmospheric delay correction maps Crowdsourced ionosphere Crowdsourced troposphere Ubiquitous

Develop potential multi-target drugs by self-assembly of quercetin with amino acids and metal ion to achieve significant efficacy in anti-Alzheimer’s disease

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Nano Research 2022年第6期15卷 5173-5182页

作者： Chunling Zhu Yuheng Yang Xiaowen Li xingyu chen Xucong Lin Xiaoping Wu Institute of Food Safety and Environment Monitoring College of ChemistryFuzhou UniversityFuzhou 350116China

Exploring multi-target drugs(MTDs)is a prevalent method against Alzheimer’s disease(AD).However,the current developed MTDs based on the“framework combination”technique or using flavonoids have not realized better healing effects owing to a complex metabolic process and low ***,we propose an alternative strategy to develop self-assembled nanoparticles(NPs)as MTDs using 9-fluorenylmethyloxycarbonyl-tryptophan(Fmoc-Trp),quercetin(Que),and Fe^(2+)as building blocks through coordination and electrostatic interaction to generate Fmoc-Trp-Fe^(2+)-Que(FTFQ)*** in cell or in vivo,FTFQ NPs exhibited considerable biocompatibility attributing to the inherent biological affinity of assembly *** combining the advantages of assemble approach and nanostructures,the obtained FTFQ NPs greatly enhanced the bioavailability of Que and displayed synergistic therapeutic effects through reducing Aβaggregation in direct/indirect means and eliminating the toxicity induced by ROS and Aβoligomer/***,FTFQ NPs could obviously restore the AD zebrafish’s mobility and stimulus response *** importantly,developing self-assembly NPs as MTDs could be an efficient and general method to promote other novel MTDs by extending the assemble units to other drugs,peptides,and metal *** on above benefits,these self-assembled NPs could be as potential MTDs and show great promising application in AD treatment.

关键词： Alzheimer’s disease multi-target drugs(MTDs) self-assembled nanoparticles(NPs) quercetin(Que)

An unexpected generation of magnetically separable Se/Fe3O4 for catalytic degradation of polyene contaminants with molecular oxygen

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Chinese Chemical Letters 2020年第12期31卷 3205-3208页

作者： xingyu chen Jingfei Mao Chuang Liu Chao chen Hongen Cao Lei Yu School of Horticulture and Plant Protection Yangzhou UniversityYangzhou 225009China Guangling Coliege Yangzhou UniversiryYangzhou 225000China School of Chemnistry and Chemical Engineerinig Yangzhou UniversityYangzhou 225002China Depaortment of Applied Chemistry Faculty of EngineeringKyushu institute of TechnologyKitakyushu 804-8550Japan

Selenization of Fe2O3 with NaHSe led to Se/*** unexpected generation of Fe3O4 attributed to the reduction conditions of the reaction,and the resulted magnetic features of the material facilitated its separation in practical *** to the synergistic effect of Se with Fe,the material was especially active to catalyze the oxidative C=C scission using O2 as mild *** technique has been successfully applied in polyene degradation project,which is of profound practical values for the treatment of the polyene pigment pollution and may be applied in the food and pha rmaceutical industry.

关键词： Magnetic materials Nanoparticles Nanocomposites Oxidation Polyene degradation

Assessing the role of mineral particles in the atmospheric photooxidation of typical carbonyl compound

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Journal of Environmental Sciences 2021年第7期33卷 56-63页

作者： Yongpeng Ji xingyu chen Yuqi Xiao Yuemeng Ji Weina Zhang Jiaxin Wang Jiangyao chen Guiying Li Taicheng An Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and HealthInstitute of Environmental Health and Pollution controlKey Laboratory of City Cluster Environmental Safety and Green developmentSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China

Mineral particles are ubiquitous in the atmosphere and exhibit an important effect on the photooxidation of volatile organic compounds(VOCs).However,the role of mineral particles in the photochemical oxidation mechanism of VOCs remains ***,the photooxi-dation reactions of acrolein(ARL)with OH radical(OH)in the presence and absence of SiO_(2) were investigated by theoretical *** gas-phase reaction without SiO_(2) has two distinct pathways(H-abstraction and OH-addition pathways),and carbonyl-H-abstraction is the dominant *** the presence of SiO_(2),the reaction mechanism is changed,i.e.,the dominant pathway from carbonyl-H-abstraction to OH-addition to carbonyl *** energy barrier of OH-addition to carbonyl C-atom deceases 21.33 kcal/mol when SiO_(2) is *** H-atom of ARL is occupied by SiO_(2) via hydrogen bond,and carbonyl C-atom is ac-tivated by SiO_(2).Hence,the main product changes from H-abstraction product to OH-adduct in the presence of SiO_(2).The OH-adduct exhibits a thermodynamic feasibility to yield HO_(2) radical and carboxylic acid via the subsequent reactions with O_(2),with implications for O 3 formation and surface acidity of mineral particles.

关键词： Photochemical oxidation Mineral particles Acrolein Reaction mechanism

Sterilization mechanism of helium/helium-oxygen atmospheric-pressure pulsed dielectric barrier discharge on membrane surface

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Plasma Science and Technology 2022年第12期24卷 173-181页

作者： xingyu chen Yuhan Li Mengqi LI Zilan XIONG State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

Pulsed dielectric barrier discharge(PDBD) exhibits several applications in different fields;however,the interaction of its components with substances remains a key *** this study,we employed experimental and numerical modeling to investigate the interactions between different PDBD components and substances in pure helium and a helium-oxygen mixture.A membrane comprising a Staphylococcus aureus strain was utilized as the treatment object to demonstrate the trace actions of the evolutions and distributions of certain components on the surface of the *** results revealed that the shapes and sizes of the discharging area and inhibition zone differed between *** a pure helium condition,a discharge layer existed along the membrane surface,lying beside the main discharging channel within the electrode ***,an annulus inhibition zone was formed at the outer edge of the electrode in the pure helium group at 30 s and 1 min,and this zone extended to a solid circle at 2 min with a radius that was~50% larger than that of the electrode ***,the discharging channel and inhibition zone in the helium-oxygen mixture were constrained inside the electrode area without forming any annulus.A 2D symmetrical model was developed with COMSOL to simulate the spatiotemporal distributions of different particles over the membrane surface,and the result demonstrated that the main components,which formed the annulus inhibition zone under the pure helium condition,contributed to the high concentration of the He^(+)annulus that was formed at the outer edge of the ***,O^(+)and O_(2)^(+)were the main components that killed the bacteria under the helium-oxygen mixture *** results reveal that the homogenization treatment on a material surface via PDBD is closely related to the treatment time and working gas.

关键词： pulsed dielectric barrier discharge interaction mechanism numerical modeling spatiotemporal distribution of species treatment substance

Paleo-Environment Reconstruction of the Middle Permian Lucaogou Formation,Southeastern Junggar Basin,NW China:Implications for the Mechanism of Organic Matter Enrichment in Ancient Lake

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Journal of Earth Science 2022年第4期33卷 963-976页

作者： Dawei cheng Chuanmin Zhou Zhijie Zhang Xuanjun Yuan Yinhe Liu xingyu chen Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China School of Earth and Space Sciences Peking UniversityBeijing 100871China

The Middle Permian Lucaogou Formation is the source rock and the main oil shale producing formation in the southeastern Junggar *** study focused on the Lucaogou Formation exposed in two outcrop sections on the northern flank of the Bogda Mountain,namely the Jingjingzigou and Dalongkou ***,we present integrated analysis of the sedimentology,major and trace elements,mineral components and total organic carbon *** paleo-environment was reconstructed including provenance,redox conditions,paleo-salinity,chemical weathering intensity and primary organic matter *** results showed that the upper and lower units were deposited in distinct depositional environments with different organic matter accumulation *** lower unit was characterized by low lake level,dry climate,fresh-brackish and well-oxygenated *** during the deposition of the upper unit the lake level rose,climate turned wetter and the bottom water became less oxidized and much *** mechanism of the organic matter accumulation is different for these two *** preserved organic matters were mainly controlled by the primary productivity in the lower unit and by the redox conditions in the upper unit.

关键词： trace element redox condition paleosalinity primary productivity chemical weathering

Review of surface transient charge measurement on solid insulating materials via the Pockels technique

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High Voltage 2021年第4期6卷 608-624页

作者： Bo Zhang Jianyi Xue xingyu chen Sile chen Haibao Mu Yang Xu Guanjun Zhang State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'anShaanxiPeople's Republic of China

Surface charges accumulated on solid insulating materials in electrical apparatuses and electronic devices could distort the initial electric field and severely damage the insulation *** transient surface charge measurement is critical to determine the mechanisms of charge transport and flashover occurrence,and estimate surface insulation strength under high *** measurement technique based on the Pockels electro-optic effect is considered as the only approach for 2-D dynamic charge distribution behaviour so far,and it has good capability to avoid original electric field distortion caused by conven-tional methods featured by metal *** paper reviews recent progress of the non-invasive dynamic surface charge measurement systems on the Pockels *** focus especially on typical systems with transmitting and reflecting configurations and the frequently used fast inversion *** can be inferred that higher spatial-temporal resolution,higher signal-to-noise ratio,and better compatibility for both transparent and opaque materials are the future development trends,which greatly depend on multiple technological breakthroughs at impact-resistant electro-optic crystals,advanced high-speed photography and high-performance inversion *** addition,the recent studies on transient behaviour of surface discharge,together with the present limitation and future prospects are *** is expected that more ideas will be inspired in transient surface charge measurement by the Pockels technique and other relevant electro-optic methods.

关键词： transient charge surface