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Application of Accelerometer Data in Precise Orbit Determination of GRACE-A and-B

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Chinese Journal of Astronomy and Astrophysics 2008年第5期8卷 603-610页

作者： dong-ju Peng Bin Wu Shanghai Astronomical Observatory CAS Shanghai 200030 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

We investigate how well the GRACE satellite orbits can be determined using the on- board GPS data combined with the accelerometer data. The preprocessing of the accelerometer data and the methods and models used in the orbit determination are presented. In order to assess the orbit accuracy, a number of tests are made, including external orbit comparison, and through Satellite Laser Ranging （SLR） residuals and K-band ranging （KBR） residuals. It is shown that the standard deviations of the position differences between the so-called precise science orbits （PSO） produced by GFZ, and the single-difference （SD） and zero-difference （ZD） dynamic orbits are about 7 cm and 6 cm, respectively. The independent SLR validation indicates that the overall root-mean-squared （RMS） errors of the SD solution for days 309 - 329 of 2002 are about 4.93cm and 5.22cm, for GRACE-A and B respectively; the overall RMS errors of the ZD solution are about 4.25 cm and 4.71 cm, respectively. The relative accuracy between the two GRACE satellites is validated by the KBR data to be on a level of 1.29cm for the SD, and 1.03 cm for the ZD solution.

关键词： celestial mechanics- ephemerides - methods numerical

Conductive Au nanowires regulated by silk fibroin nanofibers

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Frontiers of Materials Science 2014年第1期8卷 102-105页

作者： Bo-ju dong Qiang LU National Engineering Laboratory for Modern Silk College of Textile and Clothing Engineering Soochow University Suzhou 215123 China

Conductive Au-biopolymer composites have promising applications in tissue engineering such as nerve tissue regeneration. In this study, silk fibroin nanofibers were formed in aqueous solution by regulating silk self-assembly process and then used as template for Au nanowire fabrication. We performed the synthesis of Au seeds by repeating the seeding cycles for several times in order to increase the density of Au seeds on the nanofibers. After electroless plating, densely decorated Au seeds grew into irregularly shaped particles following silk nanofiber to fill the gaps between particles and finally form uniform continuous nanowires. The conductive property of the Au-silk fibroin nanowires was studied with current-voltage （I-V） measurement. A typical ohmic behavior was observed, which highlighted their potential applications in nerve tissue regeneration.

关键词： silk Au nanowire electrical conductivity biological device

Effect of manufacturing methods of AgCl/Al_2O_3 catalyst on selective catalytic reduction of NO_x

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Journal of Environmental Sciences 2011年第6期23卷 1033-1037页

作者： Satoshi Kishida dong-Ying ju Hirofumi Aritani Advanced Science Research Laboratory Saitama Institute of Technology 1690 Fusaiji Fukaya 369-0293 Japan Faculty of Engineering Saitama Institute of Technology 1690 Fusaiji Fukaya 369-0293 Japan Department of Life Science & Green Chemistry Saitama Institute of Technology 1690 Fusaiji Fukaya 369-0293 Japan

The AgCl/Al2O3 catalyst has potential for use in the selective catalytic reduction（SCR） of NOx.A compound hydrocarbon,following oxygenation is used as a type of reducing *** this experiment,the AgCl/Al2O3 catalyst was produced by four different methods,and the differences among their reduction catalysis of NOx were *** was used as a type of reducing agent.X-ray diffraction analysis was performed to study the crystalline structure and scanning electron microscope and transmission electron microscope（TEM） were applied to determine the *** results indicated that,in the range of 350-400℃,there was no significant difference on the NOx reduction rate;however,there was dispersion at high and low temperature *** size of the AgCl particles was about 20-100 nm.

关键词： AgCl/Al2O3 catalytic reduction SCR NOx

Development of materials database system for cae system of heat treatment based on data mining technology

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中国有色金属学会会刊：英文版 2006年第B02期16卷 572-576页

作者： GU Qiang ZHONG Rui ju dong-ying Graduate School of Engineering Saitama Institute of Technology Fusaiji 1690 Fukaya Saitama 369-0293 Japan Computer Science Deptartment Saitama Institute of Technology Fusaiji 1690 Fukaya Saitama 369-0293 Japan

Computer simulation for materials processing needs a huge database containing a great deal of various physical properties of materials. In order to employ the accumulated large data on materials heat treatment in the past years, it is significant to develop an intelligent database system. Based on the data mining technology for data analysis, an intelligent database web tool system of computer simulation for heat treatment process named as IndBASEweb-HT was built up. The architecture and the arithmetic of this system as well as its application were introduced.

关键词：材料加工数据库系统 CAE系统热处理数据挖掘技术

Density Functional Studies of the Reaction of Ytterbium Monocation with Fluoromethane:C-F Bond Activation and Electron-Transfer Reactivity

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Chinese Chemical Letters 2002年第4期13卷 359-362页

作者： dong ju ZHANG Cheng Bu LIU Institution of Theoretical Chemistry Shandong UniversityJi nan 250100

The potential energy surface and reaction mechanism corresponding to the reaction of ytterbium monocation with fluoromethane, which represents a prototype of the activation of C-F bond in fluorohydrocarbons by bare lanthanide cations, have been investigated for the first time by using density functional theory. A direct fluorine abstraction mechanism was revealed, and the related thermochemistry data were determined. The electron-transfer reactivity of the reaction was analyzed using the two-state model, and a strongly avoided crossing behavior on the transition state region was shown. The present results support the reaction mechanism inferred from early experimental data and the related thermochemistry data can provide a guide for further experimental researches.

关键词： C-F bond activation electron transfer ytterbium monocation fluoromethane DFT

Sweet potato and potato residual flours as potential nutritional and healthy food material

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Journal of Integrative Agriculture 2017年第11期16卷 2632-2645页

作者： ju dong MU Tai-hua SUN Hong-nan Key Laboratory of Agro-Products Processing Ministry of Agriculture/Institute of Food Science and Technology Chinese Academyof Agricultural Sciences Beijing 100193 P.R.China

In this study, the proximate composition, mineral content and amino acid composition of starch processing residues from 10 cultivars of sweet potato and 10 cultivars of potato were determined, and the nutritional and health-related values of these residues were investigated. The residual flours contained 20.63-31.48 g and 17.14-28.57 g rich dietary fiber per 100 g dry weight for sweet potato and potato, respectively, as well as mineral elements, including potassium, ferrum, zinc and copper. The highest limiting amino acid score （AAS） of the almost balanced amino acid composition were observed to be 71.07 and 57.96 for sweet potato and potato residues, respectively. A grey relational analysis showed that the nutritional values of Jishu 4 at 0.7519 and LT-5 at 0.7281 were the highest among the sweet potato and potato residues, respectively. The evaluation of the sweet potato/potato residues, the by-products of the starch industry, based on recommended daily intake （RDI） standards, indicated that the residues have potential nutritional and health-related food values.

关键词： sweet potato residue potato residue component analysis comprehensive nutritional value grey relationalanalysis

Evaluation of leaching characteristic and kinetic study of lithium from lithium aluminum silicate glass-ceramics by NaOH

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Journal of Environmental Sciences 2021年第9期33卷 98-110页

作者： dongseok Lee Sung-Ho Joo dong ju Shin Shun Myung Shin Resources Recovery Research Center Korea Institute of Geoscience and Mineral Resources(KIGAM)124 Gwahak-roYuseong-guDaejeon 34132Republic of Korea Department of Resources Recycling University of Science and Technology(UST)217Gajeong-roYuseong-guDaejeon 34113Republic of Korea

The behavior and mechanism of Li leaching from lithium aluminum silicate glass-ceramics which can be used as a secondary source of Li using aqueous NaOH solution was *** Li leaching efficiency is increased with increasing concentration of NaOH, specific surface area, and reaction *** leached under optimum conditions, 2 mol/L NaOH, 53 μm particle undersize, 1:10 solid/liquid ratio, 250 r/min stirring speed, 100℃ reaction temperature, 12 hr, the Li leaching efficiency was approximately 70%.However, when the leaching experiment was performed for 48 hr, the concentration of Li+ ions contained in the leach liquor decreased from 1160 to 236 mg/*** investigate the origin of this phenomenon, the obtained leach residue was analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray *** analyses show that zeolite was formed around the lithium aluminum silicate glass-ceramics, which affected the leaching of by adsorbing Li+ *** addition, using the shrinking-core model and the Arrhenius equation, the leaching reaction with NaOH was found to depends on the chemical reaction of the two reactants, with a higher than 41.84 kJ/mol of the activation energy.

关键词： Lithium aluminum silicate glass-ceramics NaOH Lithium Leaching

Theoretical Studies on the Thermodynamic Properties and Detonation Performances of Bicyclic Nitramines:TNAD Isomers

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Chinese Journal of Structural Chemistry 2006年第11期25卷 1309-1320页

作者： QIU Ling XIAO He-Ming GONG Xue-dong ju Xue-Hai Institute for Computation in Molecular and Material Science School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Ab initio molecular orbital calculations have been performed at Hartree-Fock （HF）, second-order Mrller-Plesset （MP2）, and hybrid density functional theory （DFT） B3LYP levels with 6-31G^＊＊ basis set to investigate the low sensitive explosive trans-1,4,5,8-tetranitro-1,4,5,8- tetraazadecalin （TNAD） and its seven bicyclic isomers. Their molecular geometries, electronic structures, thermodynamic properties, and detonation performances were predicted and compared. The relationships between structures and various properties were discussed in detail. The calculated results agree well with the available experimental data, and suggest that some compounds may be novel potential candidates of high energy density materials （HEDMs） with performances better than TNT （2,4,6-trinitrotoluene） and similar to RDX （1,3,5-trinitro-1,3,5-triazacyclohexane）.

关键词： bicyclic nitramine Hartree-Fock method MP2 method density functional theory thermodynamic properties detonation performances

Relationship between dynamic characteristics of air film of aerostatic spindle and mid-frequency of surface topography

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Advances in Manufacturing 2022年第3期10卷 428-442页

作者： dong-ju Chen Shu-Pei Li Xuan Zhang Jin-Wei Fan Mechanical Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124People's Republic of China

The dynamic characteristics of the gas film of an aerostatic spindle primary affect workpiece waviness in ultra-precision *** improve the machining accuracy of the machine tool and provide a firm theoretical basis for the design of an aerostatic spindle,a simulation model combining transient computational fluid dynamics(CFD)analysis and transient dynamic analysis is established in this study to investigate the dynamic characteristics of the spindle under unstable operating *** on a large eddy simulation,a three-dimensional flow model of an air film in an aerostatic spindle is *** simulation results show that the gas flow in the throttle chamber is turbulent,and that complex vortices are *** dynamic grid modeling technology,a CFD numerical model for the unsteady calculation of the spindle is established,and the dynamic characteristics of the gas film are obtained.A transient dynamic simulation model of an aerostatic spindle is established,and the effect of the nonlinear dynamic characteristics of the gas film on the spindle displacement response is ***,a surface morphology prediction model is *** show that film fluctuation significantly affects the dynamic characteristics of the spindle and subsequently affects the generation of surface ripples on the workpiece.

关键词： Dynamic characteristics Aerostatic spindle Surface formation Ultra-precision flying cutting