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Journal of Environmental Sciences 2013年第2期25卷 399-404页

作者： Kashif Naeem feng ouyang Central Analytical Facility Division Pakistan Institute of Nuclear Science and Technology Environmental Science and Engineering Research Center Harbin Institute of Technology Shenzhen Graduate School

The photocatalytic degradation of phenol and 4-chlorophenol （4-CP） in aqueous suspensions with the use of titanium dioxide （TiO2 ） under UV irradiation was examined. The effects of different supporting materials mixed physically with TiO2 were studied to achieve maximum degradation efficiency. Among the three supports, namely activated carbon （AC）, silica （SiO2 ） and zeolite （ZSM-5）, all exhibited paramount efficiency for degradation of phenol and 4-CP and was better than TiO2 alone. The optimum concentration was found to be 50 mg for all supporting materials. The efficiency order of the three supports was as follows： AC 〉 ZSM-5 〉 SiO2 , respectively. Whilst, the degradation of phenol and 4-CP was improved from 70.6% to 87.6% and 80.6% to 89.7%, respectively, within 120 min photocatalysis in the presence of optimal amount of AC. The degradation was also comparatively enhanced in the presence of cheaper rice husk and the activity was closed to ZSM-5 and lower than AC.

关键词： 4-chlorophenol phenol photocatalytic degradation support TiO2

Synergistic photocatalytic degradation of pyridine using precious metal supported TiO_2 with KBrO_3

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Journal of Environmental Sciences 2013年第11期25卷 2299-2305页

作者： Fei Tian Rongshu Zhu feng ouyang Environmental Science and Engineering Research Center Harbin Institute of Technology Shenzhen Graduate School Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control

A series of precious metals catalysts （M/TiO/, M = Ru, Rh, Pd, Ag, Ir, Pt or Au） were prepared by a light deposition method and the synergistic photocatalytic degradations of pyridine （20 mg/L） under UV irradiation （365 nm） using M/TiO2 with electron capture agent KBrO3 have been investigated. The results show that KBrO3 has a greatly synergistic role on M/TiO2 and the photocatalytic activity of M/TiO2 is closely related to its work function. Ag could greatly enhance the activity of TiO2 due to the binding characteristics of pyridine on Ag. Under the conditions of 0.5 wt.% Ag loading, Ag/TiO2 concentration of 0.1 g/L, KlrO3 concentration of 10 mmol/L and reaction liquid pH value at 9, the pyridine can be degraded by 64% within 3 hr, doubled than TiO2 photocatalytic system. The degradation kinetics of pyridine follows first-order kinetics and k = 5.53 × 10-3 min^-1.

关键词： pyridine synergistic photocatalysis precious metal titanium dioxide potassium bromate

Photocatalytic decomposition of acrylonitrile with N–F codoped TiO_2/SiO_2 under simulant solar light irradiation

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Journal of Environmental Sciences 2015年第7期27卷 169-178页

作者： Dandan Pang Lu Qiu Yunteng Wang Rongshu Zhu feng ouyang Shenzhen Graduate School Harbin Institute of Technology

The solid acid catalyst, N-F codoped Ti O2/Si O2 composite oxide was prepared by a sol-gel method using NH4 F as nitrogen and fluorine source. The prepared materials were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, UV-Visible diffuse reflectance spectroscopy（UV-Vis）,ammonia adsorption and temperature-programmed desorption（NH3-TPD）, in situ Fourier transform infrared spectroscopy（FT-IR） and N2 physical adsorption isotherm. The photocatalytic activity of the catalyst for acrylonitrile degradation was investigated under simulant solar irradiation. The results showed that strong Lewis and Brnsted acid sites appear on the surface of the sample after N-F doping. Systematic investigation showed that the highest photocatalytic activity for acrylonitrile degradation was obtained for samples calcined at 450°C with molar ratio（NH4F to Ti） of 0.8. The degradation ratio of 71.5% was achieved with the prepared catalyst after 6-min irradiation, demonstrating the effectiveness of photocatalytic degradation of acrylonitrile with N-F codoped Ti O2/Si O2 composite oxide. The photocatalyst is promising for application under solar light ***, the intermediates generated after irradiation were verified by gas chromatography-mass spectrometry（GC-MS） analysis and UV-Vis spectroscopy to be simple organic acids with lower toxicity, and the degradation pathway was also proposed for acrylonitrile degradation with the prepared catalyst.

关键词： Photocatalytic activity Acrylonitrile In situ IR N-F codoping

A Unified Model Fusing Region of Interest Detection and Super Resolution for Video Compression

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Computers, Materials & Continua 2024年第6期79卷 3955-3975页

作者： Xinkun Tang feng ouyang Ying Xu Ligu Zhu Bo Peng School of Computer and Cyber Sciences Communication University of ChinaBeijing100024China Cable Television Technology Research Institute Academy of Broadcasting ScienceBeijing100866China

High-resolution video transmission requires a substantial amount of *** this paper,we present a novel video processing methodology that innovatively integrates region of interest(ROI)identification and super-resolution *** method commences with the accurate detection of ROIs within video sequences,followed by the application of advanced super-resolution techniques to these areas,thereby preserving visual quality while economizing on data *** validate and benchmark our approach,we have curated a new gaming dataset tailored to evaluate the effectiveness of ROI-based super-resolution in practical *** proposed model architecture leverages the transformer network framework,guided by a carefully designed multi-task loss function,which facilitates concurrent learning and execution of both ROI identification and resolution enhancement *** unified deep learning model exhibits remarkable performance in achieving super-resolution on our custom *** implications of this research extend to optimizing low-bitrate video streaming *** selectively enhancing the resolution of critical regions in videos,our solution enables high-quality video delivery under constrained bandwidth *** results demonstrate a 15%reduction in transmission bandwidth compared to traditional super-resolution based compression methods,without any perceivable decline in visual *** work thus contributes to the advancement of video compression and enhancement technologies,offering an effective strategy for improving digital media delivery efficiency and user experience,especially in bandwidth-limited *** innovative integration of ROI identification and super-resolution presents promising avenues for future research and development in adaptive and intelligent video communication systems.

关键词： Super resolution region of interest detection video compression

Quantitative Investigation on Structural Evolution of Co-continuous Phase under Shear Flow

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Chinese Journal of Polymer Science 2022年第6期40卷 593-601页

作者： Jin Yin Qing-feng ouyang Zhao-Bo Sun feng-Yang Wu Qian Liu Xi-Xi Zhang Ling Xu Hao Lin Gan-Ji Zhong Zhong-Ming Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

Components of co-continuous phase can form an interpenetrating network structure,which has great potential to synergistically improve the mechanical properties of the blends,and to impart the functional blends superior electrical conductivity and *** this work,the effects of shear rates(50-5000 s^(-1))at different temperatures on the phase morphology,phase size and lamellar crystallites of biodegradable co-continuous polybutylene terephthalate(PBAT)/polybutylene succinate(PBS)blend are quantitatively *** results show that the above features of the PBAT/PBS have a strong dependence on the shear flow and thermal *** co-continuous phase of the blend is well maintained at 130℃.Interestingly,this phase structure transforms into a“sea-island”structure at 160℃,which gradually recovers to a co-continuous phase when the shear rate increases from 1000 s^(-1) to 5000 s^(-1).The phase size decreases with the increase of shear rate both at 130℃ and 160℃ due to the refinement and deformation of phase structures caused by strong shear ***,a unique phenomenon is observed that the shear-induced lamellar crystallites are oriented perpendicular to shear direction in the range of 500-5000 s^(-1) at 130℃,while the orientation of lamellar crystallites at 160℃ is along the shear direction within the whole range of shear *** degree of orientation for the PBAT/PBS blend crystals increases first and then decreases at both temperatures *** addition,the range of shear rate has reached the level in the industrial ***,this work has important guiding significance for the regulation of the co-continuous phase structure and the performance for the blend in the practical processing.

关键词： Co-continuous phase Shear rate Phase size Crystal orientation

Simulated Sunlight Irradiation Based Photocatalytic Degradation of Acrylonitrile by Sn-F Co-doped TiO 2/SiO 2 Nano Powder Catalyst

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Journal of Harbin Institute of Technology(New Series) 2021年第1期28卷 12-19页

作者： Hanliang Li Shiyu Miao Lu Qiu Bandna Bharti feng ouyang School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina School of Life Science and Medicine Dalian University of TechnologyPanjin 124000LiaoningChina

This study proved the significance of simulated sunlight irradiation response capability of Sn-F co-doped TiO_(2)/SiO_(2)(Sn-F-TiO_(2)/SiO_(2))photocatalysts,which were prepared by a simple sol-gel method and were evaluated by acrylonitrile degradation for photocatalytic *** synthesized catalysts were characterized by X-ray Diffraction(XRD),Scanning Electron Microscopy(SEM),Energy Dispersive Spectrometer(EDS),X-ray Photoelectron Spectroscopy(XPS),Brunauer-Emmett-Teller(BET),Ultraviolet-Visible Absorption spectroscopy(UV-Vis),and Photoluminescence Spectroscopy(PL).UV-Visible spectroscopy demonstrated that Sn doping caused remarkable red shift in TiO_(2),which significantly increased the absorption efficiency of the *** XPS results showed that Sn was successfully doped into the TiO_(2) *** photocatalytic degradation of acrylonitrile indicated that the Sn-F-TiO_(2)/SiO_(2) photocatalysts exhibited excellent photocatalytic activity when being annealed at 550℃for 2 *** degradation rate of acrylonitrile reached 67.7%after irradiation under simulated sunlight for 6 min,and the hole was the most important active species.

关键词： photocatalysis acrylonitrile degradation Sn doping F-TiO_(2)/SiO_(2)

Extraction of Sea-State Parameters with an X-Band Radar

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Wuhan University Journal of Natural Sciences 2008年第1期13卷 55-61页

作者： WU Xiongbin WU Yanqin CHENG feng ouyang Wenjie KE Hengyu School of Electronic Information Wuhan University Wuhan 430072 Hubei China

Ocean wave spectrum and surface currents can be determined from a series of spatial wave images recorded by an X-band marine radar. In the absence of a surface current, the three-dimensional spectral energy found by using the series of images will be confined to a trajectory defined by the still water dispersion relationship. The presence of a surface current will make the three-dimensional spectral energy show a corresponding Doppler shill which may determine the current using the least squares method and obtain the directional wave spectrum. On the basis of conventional wave spectrum and directional function, the paper emulates a series of X-band radar images considering shadowing modulation and simulates numerically the threedimensional image spectrum both with and without a surface current, calculates the current velocity by virtue of the Doppler shift, and obtains the two-dimensional image spectrum. Finally the paper analyzes measured wave level elevation-a function of time t to obtain one-dimensional image spectrum, and the data comes from an X-band radar in McMaster University.

关键词： X-band radar Fourier transform wave spectrum

Influence of RNA interference on the mitochondrial subcellular localization of alpha-synuclein and on the formation of Lewy body-like inclusions in the cytoplasm of human embryonic kidney 293 cells induced by the overexpression of alphasynuclein

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Neural Regeneration Research 2012年第2期7卷 85-90页

作者： Tao Chen Xiaoping Liao Guoqiang Wen Yidong Deng Min Guo Zhigang Long feng ouyang Department of Neurology Hainan Provincial People＇s Hospital Haikou 570311 Hainan Province China

The specific and effective a-synuclein RNA interference （RNAi） plasmids, and the a-synuclein-pEGFP recombinant plasmids were co-transfected into human embryonic kidney 293 （HEK293） cells using the lipofectamine method. Using an inverted fluorescence microscope, a-synuclein proteins were observed to aggregate in the cytoplasm and nucleus. Wild-type a-synuclein proteins co-localized with mitochondria. Hematoxylin-eosin staining revealed round eosinophilic bodies （Lewy body-like inclusions） in the cytoplasm of some cells transfected with a-synuclein-pEGFP plasmid. However, the formation of Lewy body-like inclusions was not observed following transfection with the RNAi pSYN-1 plasmid. RNAi blocked Lewy body-like inclusions in the cytoplasm of HEK293 cells induced by wild-type a-synuclein overexpression, but RNAi did not affect the subcellular localization of wild-type a-synuclein in mitochondria.

关键词： RNA interference a-synuclein gene subcellular localization inclusion Parkinson'sdisease neural regeneration

Synthesis, Crystal Structure and Magnetic Behaviour of Three Dimensional Iron-Cerium Cyanide Bridged Bimetallic Assembly

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Journal of Rare Earths 2001年第2期19卷 81-85页

作者：鲁统部向华欧阳凤强毛宗万计亮年 Zhongshan Univ Dept Chem Guangzhou 510275 Peoples R China

The complex with the formula [CeFe(CN)(6)(H2O)(3)]. 2H(2)O was synthesized and structurally characterized. It crystallizes in hexagonal, space group P3, a = 0.75320(10) nm, b = 0.75320(10) nm, c = 1.4374(3) nm, gamma = 120 degrees, V = 0.7062(2) nm(3), Z = 3, Be = 3.048 Mg .m(-3), F(000) = 606, mu = 6.346 mm(-1), T = 293(2) K, R-1 = 0.0169, wR(2) = 0.0459. The structure is a three-dimensional network containing open channels formed by the nine-coordinated CeN6(H2O)(3) groups and octahedral FeC6 groups through the cyanide linkages. Magnetic susceptibility measurements in the temperature range of 5.1 similar to 300 It show an antiferromagnetic interaction between the Ce3+ and Fe3+ ions.

关键词： rare earths iron-cerium complex 3d structure antiferromagnetic interaction

Applications of Infrared Spectroscopy in Analysis of Organic Aerosols

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Spectral Analysis Review 2018年第1期6卷 12-32页

作者： Gang Cao Yuan Yan Xuemei Zou Rongshu Zhu feng ouyang Harbin Institute of Technology (Shenzhen) Shenzhen Key Laboratory of Organic Pollution Prevention and Control Shenzhen China International Joint Research Center for Persistent Toxic Substances Harbin Institute of Technology (Shenzhen) Shenzhen China

This paper reviews the studies of using FTIR to investigate the components of aerosols produced in smog chamber experiments and collected in atmosphere. The fact that aerosols are mixture of small amount of countless individual compounds makes the analysis of aerosol constituents very challenging. Although a number of advanced instruments have been applied to the chemical characterization of aerosol components, the majority of aerosol components, particularly the organics, remain unknown. Being supplemental to the traditional quantitative instruments, FTIR has been recently used either individually or combining with other analytical instruments to characterize the components of aerosol particles. This paper aims to show how FTIR is applied to analysis of organic aerosols in current literature and to summarize the FTIR characteristic peak frequencies that are widely seen in the FTIR measurement of organic aerosols. It will be greatly helpful to researchers whose studies are focused on the analysis of aerosol components.

关键词： Organic Aerosol Compositions FTIR Spectroscopy Characteristic Peak Frequencies Heterogeneous Reactions Source Apportionment