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Synergistic effect of N- and F-codoping on the structure and photocatalytic performance of TiO_2

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Journal of Environmental Sciences 2015年第2期27卷 148-156页

作者： Jiemei Yu Zongming Liu haitao zhang Taizhong Huang Jitian Han Yihe zhang Daohuang Chong School of Energy and Power Engineering Shandong University School of Chemistry and Chemical Engineering University of Jinan School of Materials Science and Technology China University of Geosciences

Three types of TiO2 nanostructures were synthesized via a facile hydrolysis method at195 °C. Effects of the preparation method and doping with N and F on the crystal structure and photocatalytic performance of TiO2 were investigated. The nanomaterials were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller porosimetry, ultraviolet–visible diffuse reflectance spectroscopy and fluorescent emission spectra. Their photo-catalytic activity was examined by the photodegradation of methylene blue in aqueous solution under both ultra-violet and visible light irradiation. The results show that nitrogen and fluorine co-doped anatase TiO2 had the characteristics of a smaller crystalline size, broader light absorption spectrum and lower charge recombination than pure TiO2. Most importantly, more efficient photocatalytic activity under both ultra-violet and visible light was observed. The obtained N–F-TiO2 nanomaterial shows considerable potential for water treatment under sunlight irradiation.

关键词： TiO2hydrolysis Anion doping Photocatalyst Nanoparticle

LDV measurements of particle velocity distribution in an annular stripper

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2293-2303页

作者： Yongzheng Li Xiaolai zhang Guangwei Zhai haitao zhang Tao Li Qiwen Sun Weiyong Ying Engineering Research Center of Large Scale Reactor Engineering and Technology Ministry of EducationState Key Laboratory of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100China State Key Laboratory of Coal Liquefaction and Coal Chemical Technology Shanghai 201203China

Particle descent velocities in an annular stripper were measured by a laser Doppler velocimetry(LDV)*** the radial direction,particle descent velocity was relatively constant in the mid-region of the stripper and increased towards the walls on both sides,exhibiting an anti-U-shaped *** descent velocity in the radial mid-region increased with the increase of superficial gas velocity,and the maximum in the outer wall region increased significantly with the increase of solid mass *** stripping gas velocity had stronger effect on particle velocity distributions near the stripper gas distributor,and such effect weakened with the increase of the distance from the *** particle velocity and its radial profiles could be adjusted by changing the superficial stripping gas *** formulas were established to describe the relationships between the local particle velocity and cross-sectional averaged velocity based on the effects of operating conditions and measuring *** result showed that the predicted data was in good agreement with the experimental value.

关键词： Annular stripper Flow Hydrodynamics Particle velocity Laser Doppler velocimeter

Sensitive Determination of Five Priority Haloacetic Acids by Electromembrane Extraction with Capillary Electrophoresis

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Chinese Journal of Chemistry 2015年第2期33卷 235-240页

作者： Xiaoli zhang haitao zhang Yan Liu Lin Guo Jiannong Ye Qingcui Chu Department of Chemistry East China Normal UniversityShanghai 200241China

A method for sensitive determination of five priority haloacetic acids in drinking water has been developed for the first time based on electromembrane extraction(EME)prior to CZE with capacitively coupled contactless conductivity detection(CZE-C^(4)D).The target analytes were extracted from 10 mL of the sample solution(donor phase),through the supported liquid membrane(using a polypropylene membrane supporting 1-octanol),and into 10μL of 50 mmol/L NaAc solution(acceptor phase).The extracted solution was directly analyzed by CZE-C^(4)D without *** factors that affect separation,detection and extraction efficiency were *** the optimum conditions,five haloacetic acids(monochloroacetic acid,dichloroacetic acid,trichloroacetic acid,mono-bromoacetic acid,and dibromoacetic acid)could be well separated from other components coexisting in water samples within 23 min,exhibiting a linear calibration over two orders of magnitude(r≥0.9943);the enrichment factors at 430-671 were obtained in a 30 min of extraction,and the limits of detection were in the range of 0.17-0.61 ng/*** intraday relative standard deviations for peak areas investigated at 10 ng/mL were between 1.2%and 9.7%for the combined EME-CZE-C^(4)D *** approach offers an attractive alternative to the officially proposed method for purified drinking water analysis,which requires derivatization procedure prior to gas chromatography analysis.

关键词： disinfection byproducts haloacetic acids electromembrane extraction capillary electrophoresis ca-pacitively coupled contactless conductivity detection purified drinking water

Construction of ecological security patterns and ecological restoration zones in the city of Ningbo,China

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Journal of Geographical Sciences 2022年第4期32卷 663-681页

作者： zhang haitao LI Jialin TIAN Peng PU Ruiliang CAO Luodan Department of Geography and Spatial Information Techniques Ningbo UniversityNingbo 315211ZhejiangChina Ningbo Universities Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research at Ningbo University Ningbo 315211ZhejiangChina School of Geosciences University of South FloridaTampaFL 33620-5250USA

Studying an ecological restoration zoning process under the background of ecological security patterns is of great significance to the rapid adjustment and optimization of a landscape *** this study,a remote sensing ecological index and a morphological spatial pattern analysis method were used to assess the quality of habitats and identify ecological sources in the city of Ningbo;ecological corridors,ecological pinch points,and ecological barrier points were extracted by using a circuit theory to construct ecological security patterns and ecological restoration *** results indicate:(1)There were 47 ecological sources,and 83 key ecological corridors in Ningbo,and the ecological land area was about 1898.39 km^(2),accounting for 19.89%of the total study area.(2)The ecological source areas were distributed in“one patch and three belts”,and the low-resistance ecological corridors were concentrated in southern Yuyao city,western Haishu district,and central and western Fenghua district;the ecological network in the western and southern regions was dense.(3)There were four types of ecological restoration zones that need to be established,which were prioritized restoration zones,prioritized protection zones,key conservation zones,and general conservation zones distributed hierarchically from inner part towards outside.(4)Ninghai county,Yuyao city,and Fenghua district had large ecological land areas,however,prioritized restoration and protection zones in Ninghai and Fenghua were also *** analysis results are expected to provide a reference for optimizing a territorial ecological space in a city.

关键词： remote sensing ecological index ecological security patterns circuit theory ecological restoration zones Ningbo City

Chemical composition of sediments from the subducting Cocos Ridge segment at the Southern Central American subduction zone

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Acta Oceanologica Sinica 2022年第1期41卷 58-75页

作者： Renjie Zhao Quanshu Yan haitao zhang Yili Guan Xuefa Shi College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

Subducted sediments play an important role in the magmatism at subduction zones and the formation of mantle heterogeneity,making them an important tracer for shallow crustal processes and deep mantle ***,ascertaining the chemical compositions of different subduction end-members is a prerequisite for using subducted sediments to trace key geological *** reports here the comprehensive major and trace element analyses of 52 samples from two holes(U1414 A and U1381 C)drilled on the subducting Cocos Ridge segment at the Southern Central American(SCA)subduction zone during Integrated Ocean Drilling Program(IODP)Expedition *** results show that the SCA subducting sediments contain 51%(wt%)Ca CO_(3),27%(wt%)terrigenous material,16%(wt%)opal,and 6%(wt%)mineral-bound H2 O+.Compared to the global trenches subducting sediment,the SCA subducting sediments are enriched in biogenic elements(Ba,Sr,and Ca),and depleted in high field strength elements(Nb,Ta,Zr,Hf,and Ti)and alkali elements(K,Rb,and Cs).Meanwhile,the sediments in this area were affected by the carbonate crash event,which could have been caused by a~800 m rise in the carbonate compensation depth at 11 Ma in the Guatemala *** reason for the sedimentary hiatus at Hole U1381 C may be the closure of the Panama Isthmus and the collision between the Cocos Ridge and the Middle America *** addition,the sediments from the subducting Cocos Ridge segment have influenced the petrogenesis of volcanic lavas erupted in the SCA.

关键词： subducting sediments IODP Expedition 344 geochemistry Southern Central American subduction zone

Domain Adaptive Learning with Multi-Granularity Features for Unsupervised Person Re-identification

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Chinese Journal of Electronics 2022年第1期31卷 116-128页

作者： FU Lihua DU Yubin DING Yu WANG Dan JIANG Hanxu zhang haitao Beijing University of Technology

Unsupervised person re-identification(Re-ID) aims to improve the model's scalability and obtain better Re-ID results in the unlabeled data domain. In this paper, we propose an unsupervised person Re-ID method based on multi-granularity feature representation and domain adaptive learning, which can effectively improve the performance of unsupervised person re-identification. The multi-granularity feature extraction module integrates global and local information of different granularity to obtain the multi-granularity person feature representation with rich discriminative information. The source domain classification module learns the labeled source dataset classification and obtains the person's discriminative knowledge in the source domain. On this basis, the domain adaptive module further considers the difference between the target domain and the source domain to learn adaptively for the model. Experiments on multiple public datasets show that the proposed method can achieve a competitive performance among other stateof-the-art unsupervised Re-ID methods.

关键词： feature extraction unsupervised person re-identification image classification multigranularity feature extraction module multigranularity person feature representation deep learning (artificial intelligence) deep learning domain adaptive learning source domain classification module unsupervised person Re-ID domain adaptive module

Unsteady aerodynamic noise prediction of contra-rotating open rotor using meshless method

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Chinese Journal of Aeronautics 2024年第8期37卷 144-165页

作者： Zhiliang HONG Meng SU haitao zhang Zerui XU Lin DU Lingfeng CHEN College of Safety Science and Engineering Civil Aviation University of ChinaTianjin 300300China Civil Aviation Administration of China Beijing 100710China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China

The Contra-Rotating Open Rotor(CROR)design confronts significant noise challenges despite being one of the possible options for future green *** efficiently estimate the noise emitted from a CROR,a three-dimensional unsteady prediction model based on the meshless method is *** unsteady wake flow and the aerodynamic load fluctuations on the blade are solved through the viscous vortex particle method,the blade element momentum theory and vortex lattice ***,the acoustic field is obtained through the Farassat’s formulation *** of this method is conducted on a CROR,and a mesh-based method,e.g.,Nonlinear Harmonic(NLH)method,is also employed for *** is found that the presented method is three times faster than NLH method while maintaining a comparable precision.A thorough parametric analysis is also carried out to illustrate the effects of rotational speed,rotor-rotor spacing and rear rotor diameter on the noise *** rotor speed is found to be the most influencing factor,and by optimizing the speed difference between the front and rear rotors,a notable noise reduction can be *** current findings not only contribute to a deeper comprehension of the CROR’s aeroacoustic properties but also offer an effective tool for engineering applications.

关键词： Contra-Rotating Open Rotor(CROR) Aerodynamic noise Blade element momentum theory Viscosity vortex particle method Farassat’s formulation 1A

EXISTENCE OF ANON－STRICT MORPHISMOFQUOTIENTBANACHSPACES

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Applied Mathematics(A Journal of Chinese Universities) 1996年第2期11卷 247-249页

作者： zhang, haitao Department of Applied Mathematics Zhejiang University Hangzhou

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Revealing the role and working mechanism of confined ionic liquids in solid polymer composite electrolytes

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Journal of Energy Chemistry 2024年第12期99卷 110-119页

作者： Haiman Hu Jiajia Li Yue Wu Wenhao Fang haitao zhang Xiaoyan Ji Energy Engineering Division of Energy ScienceLulea University of Technology97187 LuledSweden Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process EngineeringChinese Academy of SciencesBeiing 100190China

The confined ionic liquid(IL) in solid polymer composite electrolytes(SCPEs) can improve the performance of lithium metal batteries. However, the impact/role and working mechanism of confined IL in SCPEs remain ambiguous. Herein, IL was immobilized on SiO_(2)(SiO_(2)@IL-C) and then used to prepare the confined SCPEs together with LiTFSI and PEO to study the impacts of confined-IL on the properties and performance of electrolytes and reveal the Li+transport mechanism. The results show that, compared to the IL-unconfined SCPE, the IL-confined ones exhibit better performance of electrolytes and cells, such as higher ionic conductivity, higher t+Li, and wider electrochemical windows, as well as more stable cycle performance, due to the increased dissociation degree of lithium salt and enlarged polymer amorphousness. The finite-element/molecular-dynamics simulations suggest that the IL confined on the SiO_(2) provided an additional Li+transport pathway(Li+→ SiO_(2)@IL-C) that can accelerate ion transfer and alleviate lithium dendrites, leading to ultrastable stripping/plating cycling over 1900 h for the Li/SCPEs/Li symmetric cells. This study demonstrates that IL-confinement is an effective strategy for the intelligent approach of high-performance lithium metal batteries.

关键词： Ionic liquid Confinement Ionic transport pathway Lithium-ion transport kinetics Lithium metal batteries