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Mineral abundances and different levels of alteration around Mawrth Vallis,Mars

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Geoscience Frontiers 2015年第5期6卷 741-758页

作者： Sheng Gou zongyu yue Kaichang Di Jinnian Wang State Key Laboratory of Remote Sensing Science.Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences

Spectral indices from OMEGA hyperspectral data show that there are two main phyllosilicates exposed in and around Mawrth Vallis:Al phyllosilicates and Fe/Mg *** analysis of CRISM spectra shows that Al phyllosilicates such as montmorillonite,hydrated silica,kaolinite;Fe/Mg phyllosilicates such as nontronite,saponite,serpentine are widespread on the light-toned *** similar stratigraphical sequences,morphologies and textures are observed on both sides of Mawrth Vallis from HiRISE images,suggesting that the geological processes that formed these units must have operated at a regional scale;the multiple endmember spectral mixture analysis(MESMA) derived mineral abundance indicates that there is a higher level of alteration in the western side relative to the eastern *** suggest that the observed phyllosilicates,stratigraphical sequences and different levels of alteration might have been caused by sedimentary deposition processes in which the composition of the external source sediment or the local solution was different,or by a pedogenic process closely related to the leaching of abundant liquid water with different chemical properties.

关键词： Spectral analysis MESMA Mineral abundance Alterati

Progresses and prospects of impact crater studies

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Science China Earth Sciences 2023年第11期66卷 2441-2451页

作者： zongyu yue Ke SHI Kaichang DI Yangting LIN Sheng GOU Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Comparative Planetology Hefei 230026China

Crater is a geologic structure in solid bodies(including the terrestrial planets, moons, and asteroids) formed by hyperspeed impact, and the impact process is extremely important to the formation and evolution of these celestial bodies. This paper presents a review of the studies on remote sensing observation, formation mechanism, and scientific application of craters. On the remote sensing study of craters, the topographic characteristics of the micro-craters, simple craters, complex craters, and impact basins are described,the related parameters in the morphological studies of craters are subsequently introduced, and the distribution characteristics of the minerals and rock types during the impact excavation process are analyzed,the methods of crater identification and the crater databases on the Moon, Mars, Ceres, and Vesta are summarized. On the studies of crater formation mechanism, the general formation process of the craters is firstly described, and then the most frequently used methods are presented, and the importance of the empirical equations is also elucidated. On the scientific applications of the craters, the principle and currently utilization of the planetary surface dating method with crater size-frequency distribution are firstly presented, and the applications, including modeling the lunar regolith formation and thickness derivation of both the regolith and basalt, are reviewed. Finally, the future prospects of the formation mechanism study of the craters are discussed.

关键词： Planets Impact craters Remote sensing observations Numerical simulation Dating with crater size-frequency distribution

Mapping Lunar Olivine Using Clementine Spectral Indices and Chemical Composition Parameters

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Acta Geologica Sinica(English Edition) 2012年第1期86卷 65-72页

作者： yue zongyu XIE Hongjie DI Kaichang OUYANG Ziyuan The State Key Laboratory of Remote Sensing Science Institute of Remote SensingApplicationsChinese Academy of SciencesBeijing 100101China Department of Geological Sciences the University of Texas at San AntonioSan AntonioTX78249USA National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China

Olivine exposures at the central peak of Copernicus crater of the Earth＇s Moon have been confirmed by telescope observations and Clementine spectra data. Using these exposures as training sites, this study used a method of combining two spectral indices （950 nm/750 nm and 2000 nm/1500 nm）, one maturity index （Is/FeO）, and four chemical content indices （FeO, Mg, Al, Ca）, through a decision tree classifier, to map olivine-rich units on the west lunar surface based on mosaicked Clementine image （500 m pixel size）. Most classified olivine exposures are found inside craters or on their rays, suggesting that olivine exposures are directly associated with the impact processes. The results have been validated in several selected sites, though further validations with data from the newest missions are strongly needed.

关键词： clementine olivine Copernicus crater

Numerical Simulation of the High-Boosting Influence on Mixing,Combustion and Emissions of High-Power-Density Engine

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Journal of Thermal Science 2023年第3期32卷 933-946页

作者： WANG Can yue zongyu ZHAO Yuanyuan YE Ying LIU Xinlei LIU Haifeng State Key Laboratory of Engines Tianjin UniversityTianjin 300072China Clean Combustion Research Center King Abdullah University of Science and TechnologyThuwal 23900Saudi Arabia

Future high-power-density engines require high level of intake ***,the effects of boosting on mixing,combustion and emissions in existing studies are *** this paper,the mixing,combustion and emission characteristics with intake pressures of 100-400 kPa at low,medium and high loads are *** results show that the increase of intake pressures is conducive to the enhancement of air entrainment,while the air utilization ratios are reduced,thus requiring injection pressure to be optimized to effectively improve the *** the intake pressures of 100 kPa,the average chemical reaction path is low-temperature reaction route,while the path of higher intake pressures is dominated by high-temperature *** soot emissions,when the equivalence ratio is lower than 0.175,the oxygen in the cylinder is suficient,so the effect of temperature decrease is more significant,which leads to the increase of soot emissions with the increase of intake ***,the effect of increasing oxygen concentration is more significant,so soot decreases *** the peak of global temperature is lower than 1800 K,the effect of the increase of oxygen concentration is more dominant,so the NO_(x)emission increases with the increase of intake ***,the rule of NOxemissions is consistent with temperature changes.

关键词： high-power-density engines high boosting mixing process combustion process emissions

Supercritical thermophysical properties prediction of multi-component hydrocarbon fuels based on artificial neural network models

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Science China(Technological Sciences) 2022年第4期65卷 903-919页

作者： MING ZhenYang LIU HaiFeng WANG QianLong yue zongyu CUI YanQing WEN MingSheng YAO MingFa State Key Laboratory of Engines Tianjin UniversityTianjin 300072China

A good understanding of the thermophysical properties of hydrocarbon fuels at supercritical pressure is important to research on experiment and numerical simulation of fuel supercritical *** measurements are difficult to conduct directly because of the extremely high pressure and high *** this study,back propagation(BP)neural network,BP optimized by mind evolution algorithm(MEA-BP)and BP neural network optimized by genetic algorithm(GA-BP)are established to determine the nonlinear temperature-dependent thermophysical properties of density,viscosity,and isobaric specific heat(C_(2))of hydrocarbon fuels at supercritical ***,approximate formulas for these properties prediction are primarily proposed using polynomial *** this paper,models that can predict three types of physical properties of three kinds of hydrocarbon fuels and their mixtures in a wide temperature range under supercritical pressure are *** the prediction of density and C_(2),BP neural network has a good prediction *** results show that the MAPE is lower than 2%in the prediction of density and C_(2),but the MAPE of viscosity prediction is slightly higher than 5%using ***,MEA and GA are used to optimize the prediction of *** optimization effect and computation of the MEA is better than that of GA because MEA does not have the local optimization and prematurity *** present work offers an efficient tool to predict the thermophysical properties of hydrocarbon fuels over a wide range of temperatures under supercritical pressure which can be easily extended to other fuels of *** will be beneficial to the experiment and numerical simulation studies of supercritical sprays.

关键词： alternative fuel supercritical spray back propagation neural network optimization algorithms thermophysical properties

Two Lunar Mare Soil Simulants

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Acta Geologica Sinica(English Edition) 2011年第5期85卷 1016-1021页

作者： Yongquan LI Jianzhong LIU Yongliao ZOU Ziyuan OUYANG Yongchun ZHENG zongyu yue China University of Geosciences Beijing 100083 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100012 China

Two new lunar mare soil simulants,NAO-2 and NAO-3,have been created in National Astronomical Observatories(NAO),Chinese Academy of *** two simulants were produced from low-titanium basalt and high-titanium basalt *** chemical composition,mineralogy, particle size distribution,density,angle of internal friction,and cohesion of both simulants have been analyzed,indicating that some characteristics of NAO-2 and NAO-3 are similar to those of Apollo 14 and Apollo 11 landing site ***-2 and NAO-3 will be of great benefit to the scientific and engineering research on lunar soil.

关键词： lunar mare soil simulants

Lunar Evolution Analysis Based on Numerical Simulations of Typical Lunar Impact Craters

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Space(Science & Technology) 2023年第1期3卷 585-596页

作者： zongyu yue Huacheng Li Nan Zhang Sheng Gou Yangting Lin Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Comparative Planetology Hefei 230026China School of Earth and Space Sciences Peking UniversityBeijing 100871China

Impact craters are one of the most important landforms on the lunar surface,playing a crucial role in the formation and later evolution of the *** example,as a primary source of remote sensing observations and lunar samples,lunar regolith is predominantly composed of impact *** on their morphologies,lunar impact craters with increasing sizes can be classified into simple craters,complex craters,and multiring basins,and they play different roles in lunar *** our study,we conducted numerical simulations of the South Pole-Aitken basin and the Orientale basin on the lunar surface,as well as the Aristarchus complex crater and the Zhinyu simple *** resultant effects of them are further *** Zhinyu crater is relatively close to the Chang’e-4 landing site,while Aristarchus crater is relatively close to the Chang’e-5 landing site,their simulation results have direct significance for interpreting the corresponding exploration data from both *** numerical simulation results demonstrate that the formation of large basins not only affects the subsurface structure within the basin but also significantly disturbs the surrounding geological *** and simple craters mainly disturb the subsurface layers within the crater,but complex craters can cause uplift of the underlying *** impact processes dominate the primary geological framework of the lunar surface,depositing ejecta materials of varying thicknesses from different depths,which has important implications for future sample collection *** conclusion,impact processes are one of the primary driving forces in the lunar evolution.

关键词： evolution basin strata

The origin and geological significance of lunar ridges

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Chinese Journal Of Geochemistry 2007年第4期26卷 418-424页

作者： yue zongyu OUYANG Ziyuan LI Haobin LIU Jianzhong WU Ganguo Department of Geosciences and Resources China University of Geosciences Beijing 100083 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

Lunar ridges are a kind of familiar linear structures developed on the lunar surface. The distribution pattern, formation mechanism and research significance of lunar ridges are discussed in this paper. Single lunar ridges are usually distributed in the form of broken lineation, and, as whole, lunar ridges are trapezoidal or annular in shape around the maria. As to the formation mechanism, only volcanism or tectonism was emphasized in the past, but the two processes are seldom taken into combined consideration. On the basis of detailed analyses, the authors thought that tectonism is a prerequisite for the formation of lunar ridges, while volcanism is the key factor controlling their particular shapes. Finally, the authors pointed out that it is very significant in the study of lunar ridges to link the course of lunar structure evolution with the stress state in the lunar crust.

关键词：构造作用火山作用压力月亮山脊

Geospatial technologies for Chang’e-3 and Chang’e-4 lunar rover missions

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Geo-Spatial Information Science 2020年第1期23卷 87-97页

作者： Kaichang Di Zhaoqin Liu Wenhui Wan Man Peng Bin Liu Yexin Wang Sheng Gou zongyu yue State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingChina

This paper presents a brief overview of the geospatial technologies developed and applied in Chang’e-3 and Chang’e-4 lunar rover *** mapping techniques were used to produce topographic products of the landing site with meter level resolution using orbital images before landing,and to produce centimeter-resolution topographic products in near real-time after *** positioning techniques were used to determine the locations of the two landers using descent images and orbital basemaps immediately after *** surface operations,visual-positioning-based rover localization was performed routinely at each waypoint using Navcam *** topographic analysis and rover localization results directly supported waypoint-to-waypoint path planning,science target selection and scientific investigations.A GIS-based digital cartography system was also developed to support rover teleoperation.

关键词： Geospatial technology lunar rover landing site mapping topographic analysis rover localization and navigation