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A star-like photodetector for angle-based light sensing in 3D space

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Nano Research 2024年第8期17卷 7567-7573页

作者： Qi Pan Sisi Chen Hongfei xie Qiling Xu Meng Su Yanlin Song College of Chemistry Zhengzhou UniversityZhengzhou 450051China Key Laboratory of Green Printing CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(ICCAS)Beijing Engineering Research Center of Nanomaterials for Green Printing TechnologyBeijing National Laboratory for Molecular Sciences(BNLMS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The development of three-dimensional(3D)space light angle detection is vital in optical technology for applications such as 3D imaging,computer vision,and augmented *** methods involve advanced sensors and algorithms,including time-offlight cameras,which need multiple cameras and light sources to improve ***,it is a great challenge to integrate these complex components into compact *** semiconductor structures offer optical resonance characteristics,enabling precise light–matter interaction regulation.A 3D star-like photodetector,fabricated using a template assistant printing strategy,demonstrates optical resonances of the subwavelength facade and the shielding effect of spatial *** achieves light angle detection with the resolution of 10°in vertical space and the resolution of 36°in horizontal space,making it a promising prototype for various applications.

关键词： photodetector light angle detection printing subwavelength structure shielding effect

Variations in summertime ozone in Nanjing between 2015 and 2020: roles of meteorology, radical chain length and ozone production efficiency

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FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING 2024年第11期18卷 137-137页

作者： Li, Lin Li, Jingyi Qin, Momei xie, Xiaodong Hu, Jianlin Zhang, Yuqiang Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Atmospher Environm & Equipm Jiangsu Key Lab Atmospher Environm Monitoring & Po Nanjing 210044 Peoples R China Shandong Univ Environm Res Inst Qingdao 266237 Peoples R China

Changes in ozone (O3) can be evaluated to inform policy effectiveness and develop reasonable emissions reduction measures. This study investigated the causes of summertime maximum daily 8-h average (MDA8) O3 variation between 2015 and 2020 in Nanjing, China, a megacity in the Yangtze River Delta (YRD) region, from the perspective of meteorological conditions and anthropogenic emissions of O3 precursors (VOCs and Nox). Compared with 2015, the observed MDA8 O3 decreased by 19.1 mu g/m3 in August 2020. The indirect and indirect impacts of meteorological conditions contributed 44% of the decline, with temperature, relative humidity, and wind playing important roles in the O3 variation. The O3 drop by 10.7 mu g/m3 (56% of the total decrease) may have been due to the decreases in anthropogenic emissions of VOCs and NOx by 7.8% and 11.7%, respectively. The longer hydroxyl (OH) radical chain length and higher ozone production efficiency (OPE) indicated that the reduction of anthropogenic emissions accelerated the ROx (ROx = OH + HO2 + RO2) and NOx cycles in O3 production, making O3 more sensitive to NOx. This corresponded to the O3 formation shifting from a VOC-limited regime in 2015 to a transition regime in 2020 and O3 decrease with anthropogenic emission reduction. Hence, the joint control of O3 precursor emissions can effectively mitigate O3 pollution in Nanjing.

关键词： Ozone Meteorological condition Anthropogenic emission OH radical chain length OPE

Temperature Distribution of Iron Ore Pellet Bed in Grate

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Journal of Iron and Steel Research International 2012年第2期19卷 7-11页

作者： FENG Jun-xiao xie Zhi-yin CHEN Yan-mei School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China

The temperature distribution of iron ore pellet bed in grate has a significant effect on pellet production and quality control, but the related work is scarce. A well-designed test was successfully carried out by means of tracking measurement and the temperature distribution and variation in pellet layers were obtained. The effects of blast tem- perature, blast velocity and oxidation reaction on the pellet layer temperature were studied. According to the analy- sis, the inlet air temperature in the up-draught drying zone （UDD） and blast temperature in the Preheating I （PH I） zone should be raised, and the length of the down-draught drying zone （DDD） should be properly increased.

关键词： grate iron ore pellet bed temperature distribution industrial test

Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 185-191页

作者： Jin Yang Xuelian Liu Hongbin Cao Yanchun Shi Yongbing xie Jiadong Xiao School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Beijing Engineering Research Center of Process Pollution Control CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

An appropriate co-catalyst can significantly promote the photocatalytic efficacy, but this has been seldom studied in the visible-light photocatalysis combined with ozone, namely photocatalytic ozonation. In this work, a dendritic bismuth vanadium tetraoxide (BiVO4) material composited with highly dispersed MnOv nanoparticles was synthesized, and its catalytic activity is 86.6% higher than bare BiVO4 in a visible light and ozone combined process. Catalytic ozonation experiments, ultraviolet- visible (UV-Vis) diffuse reflectance spectra and photoluminescence spectra jointly indicate that MnOA plays a triple role in this process. MnOv strengthens the light adsorption and promotes the charge separation on the composite material, and it also shows good activity in catalytic ozonation. The key reactive species in this process is OH, and various pathways for its generation in this process is proposed. This work provides a new direction of catalyst preparation and pushes forward the application of photocatalytic ozonation in water treatment.

关键词： manganese oxide bismuth vanadium tetraoxide photocatalytic ozonation hydroxyl radical cocatalyst

Biosorption of zinc(Ⅱ) from aqueous solution by dried activated sludge

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Journal of Environmental Sciences 2010年第5期22卷 675-680页

作者： Chunping Yang Jiaqiang Wang Min Lei Gengxin xie Guangming Zeng Shenglian Luo College of Environmental Science and Engineering Hunan University Changsha 410082 China School of Environmental and Chemical Engineering Nanchang Hangkong University Nanchang 330063 China Key Laboratory of Environmental Biology and Pollution Control （Hunan University） Ministry of Education Changsha 410082 China

The biosorption potential of dried activated sludge as a biosorbent for zinc（Ⅱ） removal from aqueous solution was *** effects of initial pH,contact time,initial zinc ion concentration,and adsorbent dosage on the biosorption processes were determined,and the equilibrium data were modeled by the langmuir and Freundlich *** langmuir isotherm model （R 2=0.999） was proved to fit the equilibrium data much better than the Freundlich isotherm model （R 2=0.918）.The monolayer adsorption capacity of dried activated sludge for zinc（Ⅱ） was found to be 17.86 mg/g at pH of 5 and 25°*** kinetic data were tested using pseudo firstand second-order *** results suggested that the pseudo second-order model （R 2 〉 0.999） was better for the description of the adsorption behavior of zinc（Ⅱ） onto the dried activated *** transform infrared spectral analysis showed that the dominant mechanism of zinc（Ⅱ） biosorption onto the dried activated sludge was the binding between amide groups and zinc ions.

关键词： activated sludge biosorption isotherms kinetics zinc(II)

Reactivities of Shenfu Chars Toward Gasification with Carbon Dioxide

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Journal of China University of Mining and Technology 2007年第2期17卷 197-200页

作者： ZHANG Jia-wei ZONG Zhi-min WANG Tao-xia xie Rui-lun DING Ming-jie CAI Ke-ying HUANG Yao-guo GAO Jin-sheng WU You-qing WEI Xian-yong School of Chemical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Luohe Occupation Technical College Luohe Henan 462000 China College of Resource and Environmental Engineering East China University of Science and Technology Shanghai 200237 China

Five Shenfu char samples were prepared from Shenfu raw coal at different temperatures （950, 1100, 1200, 1300 and 1400℃） using a muffle furnace. Demineralization of the char samples was performed by treating them with 10% nitric acid for 10 min in a CEM Discover microwave reactor. The gasification of the chars, and corresponding demineralized chars, in a carbon dioxide （CO2） atmosphere was conducted in a Netzsch STA 409Cl31F tempera- ture-programmed thermogravimetry apparatus. The effects of charring temperature and demineralization on the gasification reactivity of chars were systematically investigated. The results show that a char formed at a lower temperature is more reactive except for demineralized char formed at 1100℃, which is less reactive than char formed at 1200℃. Demineralization decreases the char reactivities toward gasification with CO2 to a small extent.

关键词： demineralization temperature-programmed thermogravimetry reactivity

Effect of Y Addition on Microstructure and Mechanical Properties of Friction Stir Welded ZK60 Alloy

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Journal of Materials Science & Technology 2009年第3期25卷 351-355页

作者： G.M. xie Z.Y. Ma L. Geng School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

6 mm thick ZK60 and ZK60-Y alloy plates were successfully friction stir welded （FSW） at a tool rotation rate of 1200 r/min and a traverse speed of 100 mm/min. FSW resulted in the dissolution of MgZn2 particles in the ZK60 and the breakup and dispersion of W-phase （Mg3Zn3Y2） particles in the ZK60-Y alloy, thereby leading; to a decrease in the hardness of the nugget zone （NZ） for the ZK60 alloy and an increase in the hardness of the NZ for the ZK60-Y alloy, respectively. While two FSW joints exhibited similar joint efficiency （87%-89% of ultimate tensile strengths of the parent materials）, the yield strength of the FSW ZK60-Y joint was substantially higher than that of the FSW ZK60 joint. The fracture occurred in the NZ and the heat affected zone for the ZK60 and ZK60-Y joints, respectively, which were consistent with the lowest hardness distribution of the welded joints.

关键词： Friction stir welding Magnesium Microstructure Mechanical properties

A theoretical study on the water-mediated asynchronous addition between urea and formaldehyde

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Chinese Chemical Letters 2013年第1期24卷 85-88页

作者： Tao-Hong Li Xiao-Guang xie Guan-Ben Du College of Wood Science and Technology Nanjing Forestry University Faculty of Chemistry Southwest Forestry University Department of Chemistry Yunnan Univerisity

The reaction between urea and formaldehyde in water solution was theoretically investigated by using B3LYP and MP2 methods. It was found that the addition of the nitrogen atom in urea to the carbonyl group in formaldehyde precedes the proton transfer and the proton migration from water to the carbonyl group occurs before the proton abstraction from the nitrogen. With one or two water molecules involved in the TS, the activation energy barrier is lowered compared to the TS of the mechanism with no water participation. The energy change along the reaction coordinate clearly shows that a zwitterionic-like intermediate does not exist on the PES. The reaction between urea and formaldehyde occurs in a concerted mechanism but with asynchronous characters, This is different from the stepwise mechanism recently found for the amination reactions of formaldehyde.

关键词： Urea Formaldehyde Water-mediated Asynchronous Addition

Study of Kinetic Characteristics for Drying Rice Husk

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Journal of Harbin Institute of Technology(New Series) 2013年第3期20卷 56-62页

作者： Xu-Dong Chen Huai-Bin Wang Ming xie School of Energy Science and Engineering Harbin Institute of Technology

Rice husk (biomass fuel) samples have been dried in drying oven and a series of drying curve for illustrating moisture migration of rice husk have been obtained. It is first research for rice husk drying,and it can provide reference of fuel processing for different boilers which require rice husk with various water contents. In this paper,we apply Page equation to reflect the drying process and obtain drying characteristic curve,then analyze the drying law. Kinetic analysis of the results of moisture migration test has been done,after which, effective moisture diffusion coefficient,activation energy and drying kinetic equation of rice husk samples are obtained in test temperature range (80 - 130 ℃) . And these results show specific influence law of temperature for effective moisture diffusion coefficient.

关键词： rice husk drying characteristic curve effective moisture diffusion coefficient activation energy kinetic analysis