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Effect of dielectric material on the uniformity of nanosecond pulsed dielectric barrier discharge

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Plasma Science and Technology 2024年第9期26卷 79-87页

作者： Wenhao zhou Dongxuan ZHANG Xiaohui DUAN Xi ZHU Feng LIU Zhi fang college of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816People’s Republic of China

Dielectric barrier discharge(DBD)is considered as a promising technique to produce large volume uniform plasma at atmospheric pressure,and the dielectric barrier layer between the electrodes plays a key role in the DBD processes and enhancing discharge *** this work,the uniformity and discharge characteristics of the nanosecond(ns)pulsed DBD with dielectric barrier layers made of alumina,quartz glass,polycarbonate(PC),and polypropylene(PP)are investigated via discharge image observation,voltage-current waveform measurement and optical emission spectral *** analyzing discharge image by gray value standard deviation method,the discharge uniformity is quantitatively *** effects of the space electric field intensity,the electron density(Ne),and the space reactive species on the uniformity are studied with quantifying the gap voltage Ug and the discharge current Ig,analyzing the recorded optical emission spectra,and simulating the temporal distribution of Ne with a one-dimensional fluid *** is found that as the relative permittivity of the dielectric materials increases,the space electric field intensity is enhanced,which results in a higher Ne and electron temperature(Te).Therefore,an appropriate value of space electric field intensity can promote electron avalanches,resulting in uniform and stable plasma by the merging of electron ***,an excessive value of space electric field intensity leads to the aggregation of space charges and the distortion of the space electric field,which reduce the discharge *** surface roughness and the surface charge decay are measured to explain the influences of the surface properties and the second electron emission on the discharge *** results in this work give a comprehensive understanding of the effect of the dielectric materials on the DBD uniformity,and contribute to the selection of dielectric materials for DBD reactor and the realization of atmospheric pre

关键词： dielectric barrier discharge dielectric material uniformity discharge characteristics

Studies on the Synthesis and Properties of K_8[TiP_2._17O_62.·12._2.

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Chemical Research in Chinese Universities 1992年第4期8卷 355-359页

作者： LIU Shi-zhong, cheng Yi, fang Guang-rong and {2. Jian-gang (Department of chemistry, hubei university, wuhan, 430062.

The present paper covers a salt of 2.18 heteropoly complex of tungstotitanophosphate prepared with the method of improved sequence preparation. The title compound was characterized by elemental analysis, 31P NMR spectra, polarography, cyclic voltammetry, IR, UV, X-ray powder diffraction , X-ray photoelectron spectra and TG-DTA analysis. The results show that the complex with the formula K8[TiP2.17O62.·12.2. has Dawson structure. Its properties such as spectra, redox behavior and thermal stability are discussed.

关键词： Tungstotitanophosphate Heteropoly acid Dawson structure

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一维光子晶体偏振特性研究

武汉大学学报（理学版） 2003年第3期49卷 365-368页

作者：张翔李承芳钟家柽武汉大学物理科学与技术学院湖北武汉430072 武汉大学化学与分子科学学院湖北武汉430072

利用传输矩阵法探讨一维光子晶体中两种不同的偏振模式的特性 .通过改变周期性分层介质的填充率、厚度、入射光频率、入射角度等参数 ,得到一维光子晶体在光频 (特别是近红外 )范围内的透射谱与以上因素的关系 ,从而设计了一维光子晶体... 详细信息

利用传输矩阵法探讨一维光子晶体中两种不同的偏振模式的特性 .通过改变周期性分层介质的填充率、厚度、入射光频率、入射角度等参数 ,得到一维光子晶体在光频 (特别是近红外 )范围内的透射谱与以上因素的关系 ,从而设计了一维光子晶体偏振器 .理论计算得到它对p偏振的透过为 - 3.0× 10 -4dB ,而对s偏振透过仅为 -4 0dB ,偏振度为 96 .7% .结果表明可以用光子晶体实现小尺寸、高偏振度的偏振器件 .

关键词：一维光子晶体偏振特性偏振模式传输矩阵法晶体结构偏振态光偏振度

Timing effect of high temperature exposure on the plasticity of internode and plant architecture in maize

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Journal of Integrative Agriculture 2024年第2期23卷 551-565页

作者： Binbin Li Xianmin Chen Tao Deng Xue Zhao fang Li Bingchao Zhang Xin Wang Si Shen Shunli zhou college of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China china Tobacco Hunan Industrial Corporation Changsha 410019China Innovation Center of Agricultural Technology for Lowland Plain of Hebei Wuqiao 061802China

The occurrence of high temperature(HT)in crop production is becoming more frequent and unpredictable with global warming,severely threatening food *** state of an organ’s growth and development is largely determined by the temperature conditions it is exposed to over *** is the main cereal crop,and its stem growth and plant architecture are closely related to lodging resistance,and especially sensitive to ***,systematic research on the timing effect of HT on the sequentially developing internode and stem is currently *** identify the timing effect of HT on the morphology and plasticity of the stem in maize,two hybrids(Zhengdan 958(ZD958),Xianyu 335(XY335))characterized by distinct morphological traits in the stem were exposed to a 7-day HT treatment from the V6 to V17 stages(Vn presents the vegetative stage with n leaves fully expanded)in *** results demonstrated that exposure to HT during V6-V12.accelerated the rapid elongation of *** instance,HT occurring at V7 and V12.specifically promoted the lengths and weights of the 3rd-5th and 9th-11th internodes,***,HT slowed the growth of internodes adjacent to the promoted ***,compared with control,the plant height was significantly increased soon after HT treatment,but the promotion effect became narrower at the subsequent flowering stage,demonstrating a self-adjusting mechanism in the maize plant in response to ***,HT altered the plant architectures,including a rising of the ear position and increase in the ear position ***335 exhibited greater sensitivity in stem development than ZD958 under HT *** findings improve our systematic understanding of the plasticity of internode and plant architecture in response to the timing of HT exposure.

关键词： maize high temperature internode growth plasticity plant architecture

Effect of different drying methods on the amino acids,α-dicarbonyls and volatile compounds of rape bee pollen

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Food Science and Human Wellness 2024年第1期13卷 517-527页

作者： Yanxiang Bi Jiabao Ni Xiaofeng Xue Zidan zhou Wenli Tian Valérie Orsat Sha Yan Wenjun Peng Xiaoming fang State Key Laboratory of Resource Insects Institute of Apicultural ResearchChinese Academy of Agricultural SciencesBeijing 100093China college of Engineering China Agricultural UniversityBeijing 100083China Bioresource Engineering Dept. McGill UniversitySte-Anne-de-Bellevue QC H9X 3V9Canada

The significant demand for high quality food has motivated us to adopt appropriate processing methods to improve the food nutritional quality and *** this study,the effects of five drying methods,namely,pulsed vacuum drying(PVD),freeze drying(FD),infrared drying(IRD),hot-air drying(HAD)and sun drying(SD)on free amino acids(FAAs),α-dicarbonyl compounds(α-DCs)and volatile compounds(VOCs)in rape bee pollen(RBP)were *** results showed that FD significantly released the essential amino acids(EAAs)compared with fresh samples while SD caused the highest *** was the dominantα-DCs in RBP and the highest loss was observed after *** were the dominant volatiles of RBP and SD samples contained more new volatile substances(especially aldehydes)than the other four drying ***,FD and PVD would be potential methods to effectively reduce the quality deterioration of RBP in the drying process.

关键词： Drying Bee pollen Free amino acids α-Dicarbonyl compounds Volatile compounds

Alcohol-dispersed polymer complex as an effective and durable interface modifier for n-i-p perovskite solar cells

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Journal of Energy chemistry 2024年第6期93卷 243-252,I0007页

作者： Chang Shi Jiangling Li Shuping Xiao Ziyi Wang Wuchen Xiang Rui Wu Yang Liu Yinhua zhou Weijun Ke Guojia fang Pingli Qin hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205HubeiChina wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina School of Physics and Technology Key Laboratory of Artificial Micro-and Nano-structures of the Ministry of Education and School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina

Abundant interfacial defects remain a significant challenge that hampers both the efficiency and stability of perovskite solar cells(PSCs).Herein,an alcohol-dispersed conducting polymer complex,denoted as PEDOT:F(Poly(3,4-ethylene dioxythiophene):Perfluorinated sulfonic acid ionomers),is introduced into the interface between perovskite and hole transporting layer in regular-structured ***:F serves as a multi-functional interface layer(filling grain boundaries and covering perovskite's grain-surface)to achieve a robust interaction with organic groups within perovskites,which could induce a structural transformation of PEDOT to increase its conductivity for the efficient ***,the strong interaction between PEDOT and perovskites could promote an effective coupling of undercoordinated Pb~(2.)ions with the lone electron pairs near O&S atoms in PEDOT molecules,thereby enhancing defect ***,PEDOT:F with inherent hydrophobic properties prevents effectively moisture invasion into perovskites for the improved long-term stability of the ***,the PEDOT:F-based PSCs achieved a champion efficiency of 2..81%,and maintained ca.92.of their initial efficiency after 7680 h of storage in a dry air environment,accompanied by the enhanced photothermal stability.

关键词： Alcohol-dispersed conducting polymer complex Interface passivation Grain boundaries Device stability Perovskite solar cells

Fluorinated [2.rotaxanes as sensitive ^(19)F MRI agents: Threading for higher sensitivity

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Chinese Chemical Letters 2024年第10期35卷 379-382页

作者： Lan Yang Yu Li Mou Jiang Rui zhou Hengjiang Cong Minghui Yang Lei Zhang Shenhui Li Yunhuang Yang Maili Liu Xin zhou Zhong-{2. Jjiang Shizhen Chen State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences-Wuhan National Laboratory forOptoelectronicsWuhan430071China university of Chinese Academy of sciences Beijing 100049China School of Pharmaceutical sciences&college of {2. and Molecular sciences Wuhan UniversityWuhan 430071China Optics Valley Laboratory Wuhan 430074China

As a promising imaging technology,the low sensitivity of fluorine-19 magnetic resonance imaging(^(19)F MRI)severely hinders its biomedical ***,we have developed an unprecedented rotaxanebased strategy to improve the sensitivity of^(19)F MRI *** threading the fluorinated macrocycle into2.blade pinwheel[2.rotaxanes,the^(19)F longitudinal relaxation rate R1was dramatically increased,resulting in a significant^(19)F MRI signal intensity enhancement of up to 79%.Through comparative molecular dynamics studies using a series of solution and solid-state^(1)H/^(19)F nuclear magnetic resonance(^(1)H/^(19)F NMR)and molecular dynamics simulations,it was found that the formation of mechanical bonds dramatically restricts the motion of the wheel fluorines and thus increasing the R1for higher^(19)F MRI *** a novel strategy for improving^(19)F MRI sensitivity,this study has established^(19)F NMR/MRI as a valuable technology for monitoring the molecular dynamics of rotaxanes,which may shed new light on high-performance^(19)F MRI agents and molecular devices.

关键词： Rotaxane ^(19)FMRI Imaging agent Mechanical bond Relaxation rate

Prestoring lithium into SnO_(2.coated 3D carbon fiber cloth framework as dendrite-free lithium metal anode

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Particuology 2024年第1期84卷 89-97页

作者： Tao Wei Yanyan zhou cheng Sun Lesheng Liu Sijia Wang Mengting Wang Ye Liu Qing Huang Quanchao Zhuang Yongfu Tang School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang212003China college of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China Li-ion Batteries Lab School of Materials Science and EngineeringChina University of Mining and TechnologyXuzhouChina Hebei Key Laboratory of Applied chemistry School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao066004China

For several decades,the promise of implementing of lithium(Li)metal anodes has been regarded as the"holy grail"for Li-based ***,we have proposed a facile design of a carbon fiber cloth(CFC)framework coated with SnO_(2.nanoparticles through a hydrothermal process,which served as a reliable host for prestoring molten Li to produce a CFC@SnO_(2.@Li composite ***,TEM,HRTEM,XPS and different electrochemical characterizations were carried *** to the synergetic effects of the 3D conductive CFC and the coated lithiophilic SnO_(2.nanoparticles,the designed CFC@SnO_(2.@Li electrodes can buffer the volume changes and reduce the local current density,thus suppress the Li dendrites during ***,the CFC@SnO_(2.electrodes showed a high and stable CE of 98.6%for 1000 cycles at a current density of 1 mA cm^(-2.(1 mAh cm^(-2.).What is more,at a high current density of 5 mA cm^(-2.and a high areal capacity of 5 mAh cm^(-2.,the symmetric cell displayed relatively low overpotential and long cycling lifetime of 1600 *** results confirm its great potential as lithium metal anodes in practical battery applications.

关键词： Lithiophilic Lithium metal anodes SnO_(2. 3D anode Dendrite-free

The role and research progress of MDSC in immune aging-related diseases

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Biomedical Engineering Communications 2024年第2期3卷 4-9页

作者： Xi-xing fang Han-{2. Li Xue-Mei Piao Yu-Ming Wang Yu-Hong Bian Medical School Hubei Minzu UniversityEnshi 445099China college of Integrative Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Nursing Department People's Hospital of Longjing CityLongjing 133499China

Myeloid-derived suppressor cells(MDSCs)are a group of heterogeneous immature cells with a strong immunosuppressive function in myeloid cells,which are impeded in the differentiation of myeloid cells under the pathological conditions of hypoxia,inflammation,infection,and *** individuals age,there is a significant increase in myeloid-derived suppressor cells(MDSCs),which subsequently enhance the immunosuppressive functions of Tregs(regulatory T cells)and Bregs(regulatory B cells).Therefore,MDSC may be related to immune system remodeling,thereby preventing excessive lesions caused by *** indicates that MDSC could serve as a potent inducer of immune *** senescence,characterized by immune dysfunction with aging,is closely linked to the onset of diseases like infections,pulmonary fibrosis,and *** achieve the purpose of anti-aging by intervening in immune aging and slow down the occurrence and development of related ***,understanding the biological characteristics of MDSC and its role in immune aging is crucial for immunotherapy targeting *** article reviews the different roles of MDSC in immune aging and its relationship with pulmonary fibrosis,tumor and other related diseases to provide theoretical basis for more comprehensive targeted MDSC immunotherapy.

关键词： MDSC immunosenescence tumor progression pulmonary fibrosis immunosenescence therapy