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How water molecules occupying the active site of a single-atom catalyst affect the electrochemical reduction of carbon dioxide

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Nano Research 2023年第7期16卷 9091-9098页

作者： Jia Zhao Di Liu Fenfei Wei Weng Fai ip Hui Pan Sen Lin State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Institute of Applied Physics and Materials Engineering University of MacaoTaipa 999078MacaoChina Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoTaipa 999078MacaoChina

In single-atom catalysts(SACs),the single atoms are often exposed as protrusions above the *** solvent molecules in the electrocatalytic environment can interact or even bind to these coordination-unsaturated single atoms and thus influence the reaction process,but this has not been studied in *** this work,we systematically investigate the thermodynamics of CO_(2)reduction reaction(CO_(2)RR)to CO over MoS_(2)-supported single metal atom catalysts(TM@MoS_(2),TM=transition metal)under vacuum and explicit solvent environments using density functional *** addition,the ab initio molecular dynamics results show that explicit H_(2)O molecules can coordinate to the TM site and undergo competitive adsorption with the CO_(2)RR intermediates,which significantly affects the energy and conformation of the CO_(2)RR *** structure analysis reveals that the occupying H_(2)O molecules change the electronic state of single atom and further influence the adsorption strength of different CO_(2)RR *** work shows that water molecules can not only act as ligands to influence the electronic state of TM,but also affect the energy and conformation of CO_(2)RR intermediates,which highlights the important role of occupying H_(2)O molecules at the single-atom sites in CO_(2)RR and provides useful insights for the design of SACs for efficient CO_(2)RR.

关键词： electrocatalytic CO_(2)reduction solvent effect single-atom catalysis density functional theory ab initio molecular dynamics

Neurovascular ageing:transcriptomic readout and implications on therapeutic targeting in Alzheimer’s disease

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维普期刊数据库

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Neural Regeneration Research 2021年第12期16卷 2411-2412页

作者： Zhongqi Li Bonaventure ip Vincent C.T.Mok Ho Ko Division of Neurology Department of Medicine and TherapeuticsThe Chinese University of Hong KongHong Kong Special Administrative RegionChina Li Ka Shing Institute of Health Sciences The Chinese University of Hong KongHong Kong Special Administrative RegionChina(Li ZKo H)Margaret K.L.Cheung Research Centre for Management of ParkinsonismThe Chinese University of Hong KongHong Kong Special Administrative RegionChina Chow Yuk Ho Technology Centre for Innovative Medicine The Chinese University of Hong KongHong Kong Special Administrative RegionChina Gerald Choa Neuroscience Centre School of Biomedical SciencesDepartment of PsychiatryPeter Hung Pain Research InstituteFaculty of MedicineThe Chinese University of Hong KongHong Kong Special Administrative RegionChina

Ageing is one of the greatest risk factors for neurodegenerative *** the complex biological changes in ageing increase the brain’s susceptibility to neurodegeneration remains incompletely *** into neurodegenerative disorders has shifted from a neuron-centric approach,to the contributing roles of age-related neurovascular and glial cell dysfunction.

关键词： incomplete susceptibility ageing

Exploration of the Outer Planets:The Galileo and Cassini Missions

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紫金山天文台台刊 1996年第2期15卷 89-96页

作者： W.-H.ip Max-Planck-Institut fuer Aeronomie D-37191 Katlenburg-Lindau Germany

the space age has brought spectacular advances in our knowledge of the solar *** flyby observations of the outer planets by the Voyagerspacecraft have been crost *** discoveries are now to be supple-mented by the Galileo Oribter to Jupiter and the Cassini Orbiter to *** the successful operations of the atmospheric probe in December 1995,the Galileo spacecraft is now in orbit around Jupiter and its comprehensive scientific observations of the Jovian system have just *** Cassini spacecraft with the Huygens atmospheric probe to Titan will be launched in 1937 with an arrival date at Saturn in *** everything goes well,these two projects will be followed by a Pluto Express mission for fast flyby reconnaissance and a Neptune Orbiter.

关键词：贾让

Structural stability of single-layered LaNi_4.25Al_0.75 film and its electro-chemical hydrogen-storage properties

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Rare Metals 2006年第5期25卷 543-548页

作者： WANG Zhongmin Chi Ying Vanessa Li ZHOU Huaiying Sammy Lap ip Chan SHI Liu Center of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China School of Materials Science and Engineering University of New Sooth Wales Sydney NSW 2052 Australia Institute of Metal Research Chinese Academy of Sciences China

AB5-based hydrogen storage thin fdms （LaNi4.25Al0.75）, deposited on Cu substrate by dc magnetron sputtering were investigated in this study. X-ray diffraction （XRD） revealed that the microstructure of the layer was in crystal form. SEM and AFM analyses proved that the film appeared to be rather rough with numerous randomly sized pores of approximately 15-40 in nm diameter. Structural stability of the film was examined by the combined analyses of DSC, XRD, and SEM, which indicated that this film maintained its structural stability below 500 K or so, and a network structure was observed on the film after being heated at 700 K for 30 min. Electrochemical hydrogen-storage properties of the films were investigated by simulated battery tests. It was found that single-layered LaNi4.25A10.75 film exhibited electrochemical hydrogen-storage properties similar to typical AB5 alloys in bulk, and the maximum discharge capacity of the film was about 220 mAh/g. After 20 charge/discharge cycles, small needle-shaped aluminium oxide was formed on some fractions of the film surface.

关键词： hydrogen storage thin film magnetron sputtering structural stability electrochemical properties

A study of the global magnetic activity of the star Kepler-17 using light curve inversion with bipartite regularization

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Research in Astronomy and Astrophysics 2021年第4期21卷 173-192页

作者： Tao Luo Yan-Yan Liang Wing-Huen ip Hao-Zhi Huang Xu-Xin Lin State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacaoChina Faculty of Information Technology Macao University of Science and TechnologyMacaoChina Institute of Astronomy “National Central University”ZhongliTaoyuan

A new method of light curve inversion with bipartite regularization(LIBR),which is complementary to the previous treatments by Bonomo and Lanza and Estrela and Valio,is used to reconstruct the physical properties of star spots on the solar-type star Kepler-17 by using the full Q1-Q17 data *** Markov Chain Monte Carlo(MCMC)method was applied to find the best profile of the reconstructed *** known value of the rotation inclination of Kepler-17 allows the generation of a star spot model in a sequence of stellar rotation with a period of 12.26 *** of the nature of the light curve inversion,the spot model is limited to the equatorial *** also investigated the starspot lifetimes of Kepler-17 utilizing the MCMC *** with the LIBR inversion results,it was found that the star spots typically last from one to several stellar *** the time evolution of the spot size,a magnetic cycle period of 437 d can be *** value is comparatively shorter than the solar cycle which might be a consequence of the younger age(~1.78 Gyr)of *** light curve of Kepler-17 is characterized by the presence of large-amplitude variation caused by star spots but no superflare *** interesting possibility is that the magnetic energy stored in the star spot regions could have been constantly dissipated by electrodynamic interaction between the central star and the hot Jupiter,Kepler-17 b,via a lower-level energy release process.

关键词： stars:activity stars:imaging stars:spots

LOCAL MEDIAN ESTIMATION OF VARIANCE FUNCTION

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Acta Mathematica Scientia 2004年第1期24卷 28-38页

作者：杨瑛 W.C.ip Y.K.Kwan P.Y.K.Kwan School of Mathematical Sciences Peking University Beijing 100871 China Department of Applied Mathematics The Hong Kong Polgytechnic University Hung Hom Kowloon Hongkong China

This paper considers local median estimation in fixed design regression problems. The proposed method is employed to estimate the median function and the variance function of a heteroscedastic regression model. Strong convergence rates of the proposed estimators are obtained. Simulation results are given to show the performance of the proposed methods.

关键词： Heteroscedasticity nonparametric median regression strong convergence rate variance function local median estimation

Detection of large color variation in the potentially hazardous asteroid(297274) 1996 SK

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Research in Astronomy and Astrophysics 2014年第3期14卷 311-318页

作者： Chien-Hsien Lin Wing-Huen ip Zhong-Yi Lin Fumi Yoshida Yu-Chi Cheng Space Science Institute Macao University of Science and Technology Institute of Astronomy National Central University National Astronomical Observatory Osawa MitakaTokyo

Low-inclination near-earth asteroid （NEA）（297274） 1996 SK, which isalso classified as a potentially hazardous asteroid, has a highly eccentric orbit. Itwas studied by multi-wavelength photometry within the framework of an NEA colorsurvey at Lulin Observatory. Here, we report the finding of large color variationacross the surface of （297274） 1996 SK within one asteroidal rotation period of4.656 ± 0.122 hours and classify it as an S-type asteroid according to its averagecolors ofB - V = 0.767 ± 0.033, V - R = 0.482 ± 0.021, V - I = 0.801 ± 0.025and the corresponding relative reflectance spectrum. These results might be indica-tive of differential space weathering or compositional inhomogeneity in the surfacematerials.

关键词： minor planets, asteroids: individual: PHA (297274) techniques: photometric

Lunar potassium distribution:Results from Chang'E-1 gamma ray spectrometer

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Science China(Physics,Mechanics & Astronomy) 2011年第11期54卷 2083-2090页

作者： ZHU Meng-Hua MA Tao CHANG Jin TANG ZeSheng ip Wing-Huen XU AoAo Space Exploration Laboratory Macao University of Science and Technology Avenida Wai Long Taipa Macao China Purple Mountain Observatory Chinese Academy of Sciences 2 West Beijing Road Nanjing 210008 China

The global map of potassium is represented in this paper from Chang'E-1 (CE-1) Gamma-ray Spectrometer (CGRS) for its one-year *** a linear relationship between net count rate and its abundance,the average potassium abundance of individual landing sites is used as ground-truth for the calibration to derive the global map of absolute *** CGRS spectra have a lower signal-to-noise ratio,the translated map still keeps relative *** calculated from Apollo,Lunar Prospector,and Kaguya,global potassium map from CGRS shows high concentrations on the lunar nearside and secondary concentrations located in the South Pole-Aitken (SPA) basin on the *** comparison with Lunar Prospector potassium map shows a good correlation,though abundances on the highlands of the farside are much lower than that of Lunar *** the footprint of CGRS measurements is larger than the sampling radius of each landing site,the calibrated map shows a larger variation range of the scale than that of Lunar Prospector,which was derived using theoretical calculation;namely,the calibrated map has higher values in the areas with high concentration while having lower values for the areas with lower ***,the derived potassium map is more consistent with the lunar sample data than that of Lunar Prospector.

关键词： Chang'E-1 gamma-ray spectrometer potassium distribution empirical calibration

Preface: The Chang'e-3 lander and rover mission to the Moon

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Research in Astronomy and Astrophysics 2014年第12期14卷 1511-1513页

作者： Wing-Huen ip Jun Yan Chun-Lai Li Zi-Yuan Ouyang Institute of Astronomy National Central University National Astronomical Observatories Chinese Academy of Sciences

The Chang＇e-3 （CE-3） lander and rover mission to the Moon was an in- termediate step in China＇s lunar exploration program, which will be followed by a sample return mission. The lander was equipped with a number of remote-sensing instruments including a pair of cameras （Landing Camera and Terrain Camera） for recording the landing process and surveying terrain, an extreme ultraviolet camera for monitoring activities in the Earth＇s plasmasphere, and a first-ever Moon-based ultravi- olet telescope for astronomical observations. The Yutu rover successfully carried out close-up observations with the Panoramic Camera, mineralogical investigations with the VIS-NIR Imaging Spectrometer, study of elemental abundances with the Active Particle-induced X-ray Spectrometer, and pioneering measurements of the lunar sub- surface with Lunar Penetrating Radar. This special issue provides a collection of key information on the instrumental designs, calibration methods and data processing pro- cedures used by these experiments with a perspective of facilitating further analyses of scientific data from CE-3 in preparation for future missions.

关键词： Chang'e-3 - Moon lander - rover - radar - lunar telescope