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Journal of Advanced Ceramics 2024年第10期13卷 1590-1599页

作者： Depeng Zeng Feng Zhu Kang Xu Hua Zhang Yangsen Xu Yu Chen School of Environment and Energy South China University of TechnologyGuangzhou 510006China

The performance of a solid oxide fuel cell(SOFC)is strongly associated with the activity and durability of the cathode,where the oxygen reduction reaction *** this study,we report our findings in the development of an Nb-doped PrBa_(0.8)Ca_(0.2)Co_(2)O_(6-δ)(PrBa_(0.8)Ca_(0.2)Co_(2-x)Nb_(x)O_(6-δ),x=0,0.025,0.05,and 0.1,denoted as PBCCNx)perovskite composite as the SOFC *** of X-ray diffraction(XRD)patterns and energy-dispersive transmission electron microscopy(TEM-EDS)images suggest that after being treated at 950℃ in air,PBCCN0.05 mainly contains phases of Ca-and Nb-doped PrBaCo2O6-δdouble perovskite,PrCoO_(3) perovskite with Ca and Nb doping,and Ba_(3)Ca_(1.18)Nb_(1.82)O_(9-δ).When evaluated as an SOFC cathode,the PBCCN0.05 mixture has shown a low polarization resistance of 0.0074Ω·cm^(2)at 800℃ in La_(0.8)Sr0.2Ga_(0.8)Mg_(0.2)O_(3)electrolyte symmetrical ***,anode-supported single cells with a configuration of Ni-Zr_(0.84)Y_(0.16)O_(2-δ)(YSZ)/YSZ/Gd_(0.1)Ce0.9O_(2-δ)/PBCCN0.05 display high electrochemical performance,with a peak power density of 1.81 W·cm^(-2)and a reasonable durability of 100 h at 800℃.PBCCN_(0.05)possesses a higher concentration of oxygen vacancies,a faster oxygen surface adsorption-dissociation rate,and an increased mass ratio of PrCoO_(3) perovskite with Ca and Nb doping compared to PrBa_(0.8)Ca_(0.2)Co_(2)O_(6)-δwithout Nb doping.

关键词： self-assembly Nb doping cathodes oxygen reduction reactions solid oxide fuel cells(SOFCs)

A Two-Electron Quantum Ring Under Magnetic Fields

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Communications in Theoretical Physics 2008年第6期49卷 1619-1621页

作者： XIE Wen-Fang Department of Physics Guangzhou University Guangzhou 510006 China

We calculate the energy levels of low-lying states of a two-electron quantum ring under the influence of perpendicular homogeneous magnetic field. Calculations are made by using the method of exact diagonalization within the effective-mass approximation. The ground-state electronic structures and angular momentum transitions as a function of the strength of a magnetic field have been revealed.

关键词： electron-electron interaction quantum dot semiconductor

The Failure Mechanism of CFRP Reinforced RC Beam under Impact Loads

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1246-1251页

作者： LU Juan ZHANG Yafang School of Civil Engineering Guangzhou UniversityGuangzhou 510006China

The influence of carbon fiber reinforced plastic(CFRP)on dynamic mechanical properties of reinforced concrete(RC)beam was studied by drop hammer impact test *** impact behaviors of beam,including failure mode,impact force peak value and peak deflection were *** experimental results show that bonding CFRP can reduce the crack width and change the failure mode of the *** length of CFRP has a certain influence on the impact force and deflection,and the peak inertia force of most beams is roughly in the range of 1/2-5/6 of the peak impact *** addition,dynamic increase factor(DIF)increases with the increase of CFRP length,and its maximum value can reach 2.11.

关键词： CFRP RC beam failure mode impact resistance DIF

Lithium intercalation mechanism for β-SnSb in Sn-Sb thin films

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International Journal of Minerals,Metallurgy and Materials 2011年第2期18卷 216-222页

作者： Qiang Ru Qin Tian She-jun Hu Ling-zhi Zhao Laboratory of Quantum Information Technology School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 China Department of Chemistry South China Normal University Guangzhou 510006 China

Based on the first-principles plane wave pseudo-potential method, the electronic structure and electrochemical performance of LixSn4Sb4 （x=2, 4, 6, and 8） and LixSn12-xSb4 （x=9, 10, 11, and 12） phases were calculated. A Sn-Sb thin film on a Cu foil was also prepared by radio frequency magnetron sputtering. The surface morphology, composition, and lithium intercalation/extraction behavior of the fabricated film were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD） and cyclic voltammetry （CV）. Lithium atoms can easily insert into and extract out of the β-SnSb cell due to the low lithium intercalation formation energy. It is found that lithium atoms first occupy the interstitial sites, and then Sn atoms at the lattice positions are replaced by excessive lithium. The dissociative Sn atoms continue to produce different Li-Sn phases, which will affect the electrode stability and lead to the undesirable effect due to their large volume expansion ratio. The calculated lithium intercalation potential is stable at about 0.7 V, which is consistent with the experimental result.

关键词： lithium batteries first-principles Sn-Sb alloys electronic structure thin films

Massive Particles' de Sitter Tunneling in (3+1)-Dimensional de Sitter Spacetimes

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Communications in Theoretical Physics 2008年第11期50卷 1258-1260页

作者： ZHOU Liang ZHANG Jing-Yi Center for Astrophysics Guangzhou University Guangzhou 510006 China

In this paper,massive particles' Hawking radiation via tunneling from cosmological horizon of a(3+1)-dimensional de Sitter spacetime is *** to Parikh's theory,when a particle tunnels across the cos-mological horizon,the effective geometry is Schwarzschild-de Sitter *** this effective spacetime,a massiveparticle can be treated as a de Broglie *** method is *** emission spectrum is obtained,and it takesthe same functional form as that of massless particles.

关键词： black hole Hawking radiation quantum theory

Semi-supervised multi-view clustering with dual hypergraph regularized partially shared non-negative matrix factorization

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Science China(Technological Sciences) 2022年第6期65卷 1349-1365页

作者： ZHANG DongPing LUO YiHao YU YuYuan ZHAO QiBin ZHOU GuoXu School of Automation Guangdong University of TechnologyGuangzhou 510006China Guangdong Key Laboratory of IoT Information Technology Guangzhou 510006China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou 510006China Center for Advanced Intelligence Project(AIP) RIKENTokyo 103-0027Japan

Real-world data can often be represented in multiple forms and views,and analyzing data from different perspectives allows for more comprehensive learning of the data,resulting in better data clustering ***-negative matrix factorization(NMF)is used to solve the clustering problem to extract uniform discriminative low-dimensional features from multi-view *** clustering methods based on graph regularization have been proposed and proven to be effective,but ordinary graphs only consider pairwise relationships between *** order to learn the higher-order relationships that exist in the sample manifold and feature manifold of multi-view data,we propose a new semi-supervised multi-view clustering method called dual hypergraph regularized partially shared non-negative matrix factorization(DHPS-NMF).The complex manifold structure of samples and features is learned by constructing samples and feature *** improve the discrimination power of the obtained lowdimensional features,semi-supervised regression terms are incorporated into the model to effectively use the label information when capturing the complex manifold structure of the ***,we conduct experiments on six real data sets and the results show that our algorithm achieves encouraging results in comparison with some methods.

关键词： multi-view clustering semi-supervised learning nonnegative matrix factorization(NMF) dual hypergraph

Antiproliferative piperidine alkaloids from giant taro(Alocasia macrorrhiza)

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Chinese Journal of Natural Medicines 2022年第7期20卷 541-550页

作者： GAO Wei WANG Yi WANG Ru WANG Yi-Hai XU Jing-Wen HE Xiang-Jiu School of Pharmacy Guangdong Pharmaceutical UniversityGuangzhou 510006China Guangdong Engineering Research Center for Lead Compounds&Drug Discovery Guangzhou 510006China

The rhizome of giant taro(Alocasia macrorrhiza(L.)Schott),which is a highly adaptable wild plant,is a traditional Chinese herbal *** the current study,the antiproliferative constituents of giant taro were investigated and six new(1−6)and four known piperidine alkaloids(7−10)were isolated from its *** chemical structures and absolute configurations were elucidated using various spectroscopic methods and the Mosher ester *** isolated alkaloids were screened for the antiproliferative activity through MTT *** results indicated that piperidine alkaloids exerted potential antiproliferative activity against HepG2,AGS and MCF-7 tumor *** researches showed that compounds 3−5 dose-dependently decreased the colony formation rate and induced the apoptosis of AGS cells,while compound 4 induced AGS cell death via the proapoptotic *** study demonstrates that the piperidine alkaloids isolated from giant taro exhibit significant antitumor activity,which provides phytochemical evidence for further development and utilization.

关键词： Giant taro Alocasia macrorrhiza Piperidine alkaloids Antiproliferative Apoptosis

Combined Fenton process and sulfide precipitation for removal of heavy metals from industrial wastewater:Bench and pilot scale studies focusing on in-depth thallium removal

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 23-34页

作者： Huosheng Li Hongguo Zhang Jianyou Long Ping Zhang Yongheng Chen Institute of Environmental Studies at Greater Bay Key Laboratory for Water Quality and Conservation of Pearl River Delta(Ministry of Education)Guangzhou UniversityGuangzhou 510006China Guangzhou University-Linkdping University Research Center on Urban Sustainable Development Guangzhou UniversityGuangzhou 510006China School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China

Thallium (Tl) in industrial wastewater is a public health concern due to its extremely high toxicity. However, there has been limited research regarding Tl removal techniques and engineering practices to date. In this investigation, bench and pilot studies on advanced treatment of industrial wastewater to remove Tl to a trace level were conducted. The treatment process involved a combination of hydroxide precipitation, Fenton oxidation, and sulfide precipitation. While hydroxide precipitation was ineffective for Tl^+ removal, it enabled the recovery of approximately 70%-80% of Zn as Zn hydroxide in alkaline conditions. The Fenton process provided good Tl removal (>95%) through oxidation and precipitation. Tl was then removed to trace levels (< 1.0 μg/L) via sulfide precipitation. Effective removal of other heavy metals was also achieved, with Cd < 13.4 μg/L, Cu < 39.6 μg/L, Pb < 5.32 μg/L, and Zn < 357 μg/L detected in the effluent. X-ray photoelectron spectroscopy indicated that T12S precipitate formed due to sulfide precipitation. Other heavy metals were removed via the formation of metal hydroxides during hydroxide precipitation and Fenton treatment, as well as via the formation of metal sulfides during sulfide precipitation. This combined process provides a scalable approach for the in-depth removal of Tl and other heavy metals from industrial wastewater.

关键词： Thallium Pilot Fenton Sulfide precipitation Heavy metal Industrial wastewater

A Helium Atom Confined by a Spherical Gaussian Potential Well

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Communications in Theoretical Physics 2008年第5期49卷 1287-1290页

作者： XIE Wen-Fang Department of Physics Guangzhou University Guangzhou 510006 China

The helium atom confined by a non-impenetrable spherical box, i.e., a spherical Gaussian potential well which possesses finite height and range, is studied employing the exact diagonalization method. Total energies of the ground and three low-excited states are obtained as a function of the confined potential radii. We find that the confinement may cause accidental degeneracies between levels with different low-excited states and the inversion of the energy values. The results for the three-dimensional spherical potential well and the two-dimensional disc-like potential well are compared with each other： in general, the energies of the states decrease and the energy intervals between states increase with the reduction of the space dimensions.

关键词： helium atom energy spectrum

Trapped Three Interacting Bosons with a Short-Ranged Interaction

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Communications in Theoretical Physics 2006年第3X期46卷 538-540页

作者： XIE Wen-Fang Department of Physics Guangzhou University Guangzhou 510006 China

A system of three bosons trapped by a parabolic confinement and interacting with a short-ranged interaction has been investigated by the exact diagonafization of the Hamiltonian matrix. We report a calculation for the energy spectrum of the low-lying states of a system of three interacting bosons. The important feature of the low-lying states of three interacting bosons trapped by a parabolic confinement is obtained via an analysis of the energy spectrum.

关键词： boson energy spectrum