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Quick-scanning X-ray absorption fine structure beamline at SSRF

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Nuclear Science and Techniques 2024年第6期35卷 1-13页

作者： Yu Chen Qian gao zheng Jiang Jiong li Shuo Zhang Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

The layout and characteristics of the hard X-ray spectroscopy beamline(BL11B)at the Shanghai synchrotron radiation facility are described ***11B is a bending-magnet beamline dedicated to conventional and millisecond-scale quick-scanning X-ray absorption fine *** is equipped with a cylindrical collimating mirror,a double-crystal monochromator comprising Si(111)and Si(311),a channel-cut quick-scanning Si(111)monochromator,a toroidal focusing mirror,and a high harmonics rejection *** can provide 5-30 keV of X-rays with a photon flux of~5×10^(11)photons/s and an energy resolution of~1.31×10^(-4)at 10 *** performance of the beamline can satisfy the demands of users in the fields of catalysis,materials,and environmental *** paper presents an overview of the beamline design and a detailed description of its performance and capabilities.

关键词： Bending magnet beamline X-ray absorption fine structure Quick-scanning XAFS In situ Synchrotron radiation

Electrostatic removal of ultrafine carbon black with square-grooved collecting plates:Insights for capturing black carbon emitted from ships

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Journal of Environmental Sciences 2024年第2期136卷 559-569页

作者： Zhicheng Wu YifanWang lingyu Shao Hao Zhang Haobo dai Haidong Fan Chenghang zheng Xiang gao State Key Lab of Clean Energy Utilization State Environmental Protection Engineering Center for Coal-Fired Air Pollution ControlZhejiang UniversityHangzhou 310027China Department of Earth and Environmental Sciences University of ManchesterOxford RoadUnited Kingdom Zhejiang Tiandi Environmental Protection Engineering Co. Ltd.Hangzhou 310012China Baima Lake Laboratory(Zhejiang Provincial Laboratory of Energy and Carbon Neutrality) Hangzhou 310000China

Ships and other mobile pollution sources emitted massive ultrafine and low-resistivity particles containing black carbon(BC),which were harmful to human health and were difficult to capture by conventional electrostatic precipitators(ESPs).In this study,nanoscale carbon black was adopted as simulated particles(SP)with similar physicochemical properties for black carbon emitted from ships(SP-BC)to investigate the feasibility of using an ESP with square-grooved collecting plates for the removal of SP-BC at low *** increased applied voltage significantly improved the total collection of SP-BC whereas may also promote the conversion of relatively larger particle size SP-BC into nano-size below *** outlet number concentration of SP-BC under 27 kV at 130℃was three times that of the *** the reduction of the flow rate could strengthen the capture of SP-BC below20 nm,and under the combined action of low flow rate and maximum applied voltage,the collection efficiency of 20-100 nm SP-BC could exceed 90%.In addition,the escape and capture characteristics of SP-BC under long-term rapping were *** square-grooved collecting plate could effectively restrain the re-entrainment of collected SP-BC generated by rapping,and the nanoscale SP-BC was trapped in the grooves after *** results could provide insights into the profound removal of massive nanoscale black carbon emissions from mobile sources.

关键词： Simulated ship black carbon Electrostatic removal Square-grooved collecting plate Long-term rapping

Impact of Local Climate Zones on the Urban Heat and Dry Islands in Beijing:Spatial Heterogeneity and Relative Contributions

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Journal of Meteorological Research 2024年第1期38卷 126-137页

作者： Zuofang zheng Fu LUO Nana li Hua gao Yuanjian YANG Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089 School of Atmospheric Physics Nanjing University of Information Science&TechnologyNanjing 210044 Key Laboratory of Urban Meteorology China Meteorological AdministrationBeijing 100089

Based on the building height and density data on a 100-m resolution,hourly 2-m temperature and humidity data at83 automatic weather stations,and gridded local climate zone(LCZ)data on a 120-m resolution in urban Beijing in2020,this study first employs the semivariogram combined with building parameters to calculate spatial correlations and has identified an LCZ grid resolution of 500 m suitable for best usage of the available observation ***,how the spatially heterogeneous LCZs affect and contribute to the canopy urban heat island intensity(UHII)and urban dry island intensity(UDII)are quantitatively *** is found that UHII is high in winter and low in summer with a unimodal diurnal variation while UDI is low in winter but high in summer with a bimodal diurnal *** LCZ with compact mid-rise(open high-rise)buildings exhibits the highest UHII(UDII),followed by the compact high-rise(compact low-rise),while the LCZ of scattered trees presents both the lowest UHII and the lowest *** most significant difference in the UHII(UDII)among the nine LCZ types in the urban area of Beijing is2.62℃(1.1 g kg^(-1)).Area-weighted averaging analysis reveals that the open mid-rise LCZ is the most significant contributor to the UHII(UDII),immediately followed by compact mid-rise(open low-rise),with the least contribution from bare rock or paved(scattered trees).The results also indicate that beyond the intrinsic physical properties of the LCZs of a city,their area proportions cannot be overlooked in evaluating their impact on the UHI and *** quantitatively findings could help urban planners to create a livable urban climate and environment by adjusting the relevant land use.

关键词： local climate zone(LCZ) urban heat island(UHI) urban dry island(UDI) distribution pattern contribution rate Beijing

Multidimensional Analgesia of Acupuncture by Increasing Expression of MD2 in Central Nervous System

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Chinese Journal of Integrative Medicine 2024年第11期30卷 1035-1044页

作者： li Wan-rong REN Lu-lu ZHAO Tian-tian dai Dan-qing gao Xiao-fei liANG Hua-zheng XIONG li-ze Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation Shanghai Fourth People's Hospital School of Medicine Tongji University Clinical Research Center for Anesthesiology and Perioperative Medicine Shanghai Fourth People's Hospital School of Medicine Tongji University Translational Research Institute of Brain and Brain-like Intelligence Shanghai Fourth People's Hospital School of Medicine Tongji University Department of Anesthesiology and Perioperative Medicine Shanghai Fourth People's Hospital School of Medicine Tongji University School of Rehabilitation Southwest Jiaotong University Monash Suzhou Research Institute

Objective:To investigate changes of myeloid differentiation factor 2（MD2） in inflammationinduced pain and acupuncture-mediated ***:Mice were randomly divided into three groups by a random number table method:saline group（n=16）,complete Freund's adjuvant（CFA） group（n=24） and CFA+electroacupuncture（EA） group（n=26）.Inflammation-induced pain was modelled by injecting CFA to the plantar surface of the hind paw of mice and EA was applied to bilateral Zusanli（ST 36） to alleviate *** mice in the CFA+EA group received EA treatment（30 min/d for 2 weeks） 24 h after *** in the saline and CFA groups received sham ***-Frey test and Hargreaves test were used to assess the pain *** and spinal tissues were collected for immunofluorescence staining or Western blotting to quantify changes of MD2 ***:CFA successfully induced plantar pain and EA significantly alleviated pain 3 days after modelling（P1）.Compared with the CFA group,the number of MD2+/c-fos+neurons was significantly increased in the dorsal horn of the spinal cord 7 and 14 days after EA,especially in laminae Ⅰ-Ⅱ_o（P1）.The proportion of double positive cells to the number of c-fos positive cells and the mean fluorescence intensity of MD2 neurons were also significantly increased in laminae Ⅰ-Ⅱ_o（P1）.Western blotting showed that the level of MD2 was significantly decreased by EA only in the hippocampus on day 7 and 14（both P1） and no significant changes were observed in the cortex,thalamus,cerebellum,or the brainstem（P>0.05）.Fluorescence staining showed significant decrease in the level of MD2 in periagueductal gray（PAG） and locus coeruleus（LC） after CFA injection on day 7（P1 for PAG,P1 for PAG,P2 suggest that EA may exert the analgesic effect through modulating neuronal activities of the superficial laminae of the spinal cord and certai

关键词： dorsal horn electroacupuncture inflammation-induced pain locus coeruleus myeloid differentiation factor 2 periaqueductal gray

Piezoelectric film promotes skin wound healing with enhanced collagen deposition and vessels regeneration via upregulation of PI3K/AKT

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Nano Research 2024年第8期17卷 7461-7478页

作者： Qi Xu Wufei dai Peizhe li Qinglin li Zhen gao Xiaoli Wu Wei liu Wenbo Wang Department of Plastic and Reconstructive Surgery Shanghai Key Laboratory of Tissue EngineeringShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Research Institute of Plastic Surgery Shandong Second Medical UniversityWeifang 261000China Department of Surgery Air Force Medical CenterPLABeijing 100142China

Skin wounds are common in accidental injuries,and the intricacies of wound repair are closely linked to endogenous electric *** stimulation plays a pivotal role in the restorative processes of skin injuries,encompassing collagen deposition,angiogenesis,inflammation,and *** electrical stimulation therapy replicates and enhances the effects of endogenous wound electric fields by applying an external electric field to the wound site,thereby promoting skin wound *** this study,we developed a self-powered repetitive mechanical impacts-electrical stimulation(RMI-ES)system utilizing a BaTiO_(3)/polydimethylsiloxane(PDMS)piezoelectric composite *** to conventional electrical stimulation devices,the fabricated piezoelectric composite film efficiently harvests energy from the pressure applied by the stimulation device and the tensile force occurring during natural rat *** results demonstrated that piezoelectric stimulation generated by the composite membrane expedited the cell cycle,promoting fibroblast ***,piezoelectric stimulation induced favorable changes in fibroblast gene expression,including increased expression of transforming growth factor-β1(TGF-β1),connective tissue growth factor(CTGF),collagen 1,collagen 3,vascular endothelial growth factor(VEGF),and alpha-smooth muscle actin(α-SMA),while reducing interleukin-6(IL-6)*** analysis revealed that piezoelectric stimulation may induce fibroblast migration,proliferation,and collagen expression by influencing PI3K/AKT serine/threonine kinase(AKT)*** confirmation through the addition of the PI3K inhibitor LY294002 validated that piezoelectric stimulation can regulate the repair process after skin injury through the ***,in vivo results demonstrated that the electric field at the wound site effectively promoted wound healing,reduced inflammation,and stimulated collagen deposition and ne

关键词： BaTiO3/polydimethylsiloxane(PDMS)nano-composite membrane piezoelectrical stimulation skin wound healing collagen deposition PI3K/AKT serine/threonine kinase(AKT)signaling pathway

Study on thermal cycling ageing resistance of performances of polypropylene/elastomer/boron nitride nanocomposites for high voltage direct current cable insulation

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High Voltage 2024年第3期9卷 556-565页

作者： Jing li Yu gao zheng Song Baixin liu Chenyi Guo Yu Chen Junguo gao Boxue Du School of Electrical and Information Engineering Tianjin UniversityTianjinChina State Grid Tianjin Chengxi Electric Power Supply Branch TianjinChina State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinChina

The influences of thermal cycling ageing on structures and insulation performances of polypropylene(PP)/elastomer/boron nitride(BN)nanocomposites are *** Melt blending method was used to prepare the nanocomposites,in which propylene-based elastomer(PBE)or ethylene-octene copolymer elastomer(EOC)was contained for ***,the samples were treated using a thermal cycling process with a temperature range from-30 to 150℃,and the number of thermal cycles was set from 0 to *** electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry and X-ray diffraction measurements were taken to facilitate the comprehension of structural ***,measurements were taken to assess the trap distribution and direct current(DC)breakdown strength of the *** obtained results revealed that following thermal cycling ageing,the morphology and crystallinity of PP/PBE/BN remained almost *** contrast,PP/EOC/BN exhibited substantial microstructural damage accompanied by a significant reduction in *** the number of thermal cycles increased,the trap level and DC breakdown strength of PP/PBE/BN were maintained at high levels,while those of PP/EOC/BN initially remained stable but then experienced a sharp *** is sug-gested that the addition of BN nanoparticles enhances the thermal cycling ageing resis-tance of the PP/PBE blend,whereas it weakens this resistance of the PP/EOC blend.

关键词： cycling resistance thermal

Stable Cycling of All-Solid-State lithium Metal Batteries Enabled by Salt Engineering of PEO-Based Polymer Electrolytes

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Energy & Environmental Materials 2024年第2期7卷 67-74页

作者： Lujuan liu Tong Wang li Sun Tinglu Song Hao Yan Chunli li Daobin Mu Jincheng zheng Yang dai Department of Chemical Engineering Shanghai UniversityShangda Road 99Shanghai 200444China School of Material Science&Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Physics Xiamen UniversityXiamen 361005China

Poly(ethylene oxide)(PEO)-based polymer electrolytes show the prospect in all-solid-state lithium metal batteries;however,they present limitations of low room-temperature ionic conductivity,and interfacial incompatibility with high voltage ***,a salt engineering of 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonimide lithium salt(liHFDF)/liTFSI system was developed in PEO-based electrolyte,demonstrating to effectively regulate li ion transport and improve the interfacial stability under high *** show,by manipulating the interaction between PEO matrix and TFSI^(-)-HFDF^(-),the optimized solid-state polymer electrolyte achieves maximum li+conduction of 1.24×10^(-4)S cm^(-1)at 40℃,which is almost 3 times of the ***,the optimized polymer electrolyte demonstrates outstanding stable cycling in the liFePO_(4)/li and liNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)/li(3.0-4.4 V,200 cycles)based all-solid-state lithium batteries at 40℃.

关键词： all-solid-state battery high voltage li-ion conductivity molecular interaction poly(ethylene oxide)

Orthogonal Combinatorial Raman Codes Enable Rapid High-Throughput-Out library Screening of Cell-Targeting ligands

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Research 2024年第1期2023卷 199-208页

作者： Yuchen Tang Xingxing zheng Tingjuan gao China Key Laboratory of Pesticide and Chemical Biology of Ministry of Education College of ChemistryCentral China Normal UniversityWuhan 430079China

High-throughput assays play an important role in the fields of drug discovery,genetic analysis,and clinical *** super-capacity coding strategies may facilitate labeling and detecting large numbers of targets in a single assay,practically,the constructed large-capacity codes have to be decoded with complicated procedures or are lack of survivability under the required reaction *** challenge results in either inaccurate or insufficient decoding ***,we identified chemical-resistant Raman compounds to build a combinatorial coding system for the high-throughput screening of cell-targeting ligands from a focused 8-mer cyclic peptide *** accurate in situ decoding results proved the signal,synthetic,and functional orthogonality for this Raman coding *** orthogonal Raman codes allowed for a rapid identification of 63 positive hits at one time,evidencing a high-throughput-out capability in the screening *** anticipate this orthogonal Raman coding strategy being generalized to enable efficient high-throughput-out screening of more useful ligands for cell targeting and drug discovery.

关键词： enable throughput allowed

Piezoelectric sensing method for segmental joint contact stress during shield tunnel construction

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Underground Space 2024年第4期17卷 82-99页

作者： Guodong Jiang Minghao dai Guozhu Zhang limin gao Institute of Geotechnical Engineering Southeast UniversityNanjing 211189China Nanjing Metro Group Co.Ltd Nanjing 210000China No.4 Construction Company of China Petroleum Pipeline Engineering Co.Ltd Langfang 065000China

The emergence of curved shield tunnels poses a significant construction *** the quality of the segment assembly is not guaranteed,many segment cracks and damage will result from the stress *** the contact stresses between segmental joints is necessary to improve the quality of segments assembled for shield tunnel *** difluoride(PVDF)piezoelectric material was chosen for the sensor because it can convert contact stresses into electrical signals,allowing the state of the segmental joints to be effectively *** matches the working environment between the segmental joints of the shield tunnel,where flexible structures such as rubber gaskets and force transfer pads are *** study proposes a piezoelectric sensing method for segmental joints in shield tunnels and conducts laboratory tests,numerical analyses,and field tests to validate the feasibility of the *** results indicate that the PVDF film sensor can effectively sense the entire compression process of the gasket with different amounts of *** piezoelectric cable sensor can effectively sense the joint offset direction of the *** differently shaped sections,the variation in the force sensed by the piezoelectric cable sensors was different,as verified by numerical *** the field test,it was found that the average contact stress between the segmental joints was in the range of 1.2–1.8 MPa during construction of the curved shield *** location of the segmental joints and the type of segment affect the contact stress *** field monitoring results show that piezoelectric sensing technology can be successfully applied during assembly of the segments for effective sensing of the contact stress.

关键词： Shield tunnel Segmental joint Contact stress Piezoelectric sensor