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Diverse sesquiterpenoids from Litsea lancilimba *** potential neuroprotective effects against H_(2)O_(2)-induced SH-SY5Y cell injury

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Chinese Journal of Natural Medicines 2022年第9期20卷 701-711页

作者： ZHANG Yi-Jie BAI Ming LI Jia-Yi qin shu-Yan LIU Yu-Yang HUANG Xiao-Xiao ZHENG jiang SONG Shao-jiang Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research&Development Liaoning ProvinceEngineering Research Center of Natural Medicine Active Molecule Research&DevelopmentLiaoning ProvinceKey Laboratory of Natural Bioactive Compounds Discovery&ModificationShenyangSchool of Traditional Chinese Materia MedicaShenyang Pharmaceutical UniversityShenyang 110016China Wuya College of Innovation Shenyang Pharmaceutical UniversityShenyang 110016China State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Provincial Key Laboratory of PharmaceuticsGuizhou Medical UniversityGuiyang 550004China

Five undescribed sesquiterpenoids(1–5),and nine known sesquiterpenoids(6–14)were obtained from the fruits of Litsea lancilimba *** LC-MS/MS molecular networking *** A(1)possessed a unique 8-member ring through unexpected cyclization of the methyl group on C-10 of *** structures were elucidated by spectroscopic techniques including IR,UV,NMR,HR-ESI-MS,and their absolute configurations were assigned by ECD *** isolated sesquiterpenoids were analyzed by bioinformatics and evaluated for their neuroprotective effects against H_(2)O_(2)-induced injury in human neuroblastoma SH-SY5Y cells.

关键词： Litsea lancilimba Lauraceae Sesquiterpenoids Neuroprotective effect

Simulation of gene pyramiding in Drosophila melanogaster

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Journal of Genetics and Genomics 2008年第12期35卷 737-742页

作者： Li jiang Fuping Zhao qin Zhang State Key Laboratories for Agrobiotechnology Key Laboratory for Animal Genetic and Breeding of the Ministry of Agriculture College of Animal Science and Technology China Agricultural University Beijing 100094 China

Gene pyramiding has been successfully practiced in plant breeding for developing new breeds or lines in which favorable genes from several different lines were integrated. But it has not been used in animal breeding, and some theoretical investigation and simulation analysis with respect to its strategies, feasibility and efficiency are needed before it can be implemented in animals. In this study, we used four different pure lines of Drosophila melanogaster, each of which is homozygous at a specific mutant gene with a visible effect on phenotype, to simulate the gene pyramiding process and analyze the duration and population size required in different pyramiding strategies. We finally got the ideal individuals, which are homozygous at the four target genes simultaneously. This study demonstrates that gene pyramiding is feasible in animal breeding and the interaction between genes may affect the final results.

关键词： gene pyramiding Drosophila melanogaster simulation

Study of parametric roll in oblique waves using a three-dimensional hybrid panel method

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Journal of Hydrodynamics 2020年第1期32卷 126-138页

作者： Min Gu shu-xia Bu jiang Lu jiangsu Key Laboralory of Green Ship Technology China Ship Scientific Research CenterWiuxi 214082.China

A reliable numerical tool for the prediction of the parametric roll is important in the development of the second generation intact stability *** main difficulty of the prediction of the parametric roll comes from the significant coupling of the roll with other motions,especially the heave and pitch *** this paper,the numerical method for determining the parametric roll is studied and the results are benchmarked against the model test ***,a 3 degrees-of-freedom(DOF)time domain hybrid panel method is validated by experimental data in regular oblique waves and irregular head ***,the verified 3D O F method is extended to a fully coupled 6 DOF method with the course ***,taking the C11 containership as the test case,the parametric roll in oblique waves is computed,and the effects of the surge,sway and yaw motions on the parametric roll are evaluated with the developed mathematical *** results show that the effects of the surge and sway motions on the parametric roll is insignificant,while the effects of the yaw motion are more *** results of the roll amplitudes and the standard deviation of the roll angles show that the model based on 3 DOF gives relatively conservative results,and can be directly used for the stability assessment of the parametric roll.

关键词： 6DOF mathematical model irregular oblique waves second generation intact stability in IMO

Plastic Deformation Mechanism in Double-Roller Clamping Spinning of Flanged Thin-Walled Cylinder

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Chinese Journal of Mechanical Engineering 2018年第3期31卷 76-84页

作者： shu-qin Fan Sheng-Dun Zhao Chao Chen School of Mechanical Engineering Xi’an Jiaotong University

Double?roller clamping spinning(DRCS) is a new process for forming a thin?walled cylinder with a complex surface flange. The process requires a small spinning force,and can visibly improve forming quality and production e ciency. However,the deformation mechanism of the process has not been completely understood. Therefore,both a finite element numerical simulation and experimental research on the DRCS process are carried out. The results show that both radial force and axial force dominate the forming process of DRCS. The deformation area elongates along the radial direction and bends along the axial direction under the action of the two forces. Both the outer edge and round corner of the flange show the tangential tensile stress and radial compressive stress. The middle region shows tensile tangential stress and radial stress,while the inner edge shows compressive tangential stress and radial stress. Tan?gential tensile strain causes a wall thickness reduction in the outer edge and middle regions of the flange. The large compressive thickness strain causes material accumulation and thus,an increase in the wall thickness of the round corner. Because of bending deformation,the round corner shows a large radial tensile strain in addition. The inner edge of the flange shows small radial compressive strain and tensile strain in thickness. Thus,the wall thickness on the inner edge of the flange continues to increase,although the increment is small. Furthermore,microstructure analysis and tensile test results show that the flanged thin?walled cylinder formed by DRCS has good mechanical properties. The results provide instructions for the application of the DRCS process.

关键词： Flange Double?roller clamping spinning Plastic deformation Cylinder

First-principles study on the diffusion behavior of Cs and I in Cr coating

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Nuclear Science and Techniques 2024年第6期35卷 177-188页

作者： shu-Ying Lin Xiao-Jing Li Lin-Bing jiang Xi-Jun Wu Hui-qin Yin Yu Ma Wen-Guan Liu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Nuclear Science and Technology University of South ChinaHengyang 421001China

Cs and I can migrate through fuel-cladding interfaces and accelerate the cladding corrosion process induced by the fuel-cladding chemical *** coating has emerged as an important candidate for mitigating this chemical *** this study,first-principles calculations were employed to investigate the diffusion behavior of Cs and I in the Cr bulk and grain boundaries to reveal the microscopic interaction mitigation mechanisms at the fuel-cladding *** interaction between these two fission products and the Cr coating were studied systematically,and the Cs and I temperature-dependent diffusion coefficients in Cr were obtained using Bocquet’s oversized solute-atom model and Le Claire’s nine-frequency model,*** results showed that the Cs and I migration barriers were significantly lower than that of Cr,and the Cs and I diffusion coefficients were more than three orders of magnitude larger than the Cr self-diffusion coefficient within the temperature range of Generation-IV fast reactors(below 1000 K),demonstrating the strong penetration ability of Cs and ***,Cs and I are more likely to diffuse along the grain boundary because of the generally low migration barriers,indicating that the grain boundary serves as a fast diffusion channel for Cs and I.

关键词： First-principles calculation Fuel cladding chemical interaction Cr coating Fission product Diffusion Grain boundary

A Generalized Numerical Approach for Modeling Multiphase Flow and Transport in Fractured Porous Media

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Communications in Computational Physics 2009年第6期6卷 85-108页

作者： Yu-shu Wu Guan qin Department of Petroleum Engineering Colorado School of MinesGoldenCO 80401USA Institute for Scientific Computation Texas A&M UniversityCollege StationTX 77843USA

A physically based numerical approach is presented for modeling multiphase flow and transport processes in fractured *** particular,a general framework model is discussed for dealing with fracture-matrix interactions,which is applicable to both continuum and discrete fracture *** numerical modeling approach is based on a general multiple-continuum concept,suitable for modeling any types of fractured reservoirs,including double-,triple-,and other multiplecontinuum conceptual *** addition,a new,physically correct numerical scheme is discussed to calculate multiphase flow between fractures and the matrix,using continuity of capillary pressure at the fracture-matrix *** proposed general modeling methodology is verified in special cases using analytical solutions and laboratory experimental data,and demonstrated for its application in modeling flow through fractured vuggy reservoirs.

关键词： Integrated finite difference conservation of mass and energy Newton iteration fully implicit reservoir simulation fractured rock

Effect of Solvents on the Absorption Properties of GaP Nanocrystals

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Chinese Physics Letters 1998年第4期15卷 307-309页

作者： CUI De-liang GAO Shan-min HUANG Bai-biao YU shu-qin qin Xiao-yan jiang Min-hua National Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong UniversityJinan 250100

GaP nanocrystals were synthesized by both the organic solvent reflux and high temperature high pressure benzene thermal synthesis *** effect of organic solvent on the optical absorption properties of GaP nanocrystals were *** results show that crystal grains of the sample synthesized by the latter method have better quality and *** solvents which consist of polar molecules and form strong chemical bonds with Ga atoms cause obvious redshift of the absorption spectra of GaP *** absorption spectra redshift much more if the solvent molecules have π electrons which involved in the formation of complex bond between Ga atoms and solvent molecules.

关键词： methods absorption bonds

Effect of reactive surface area of minerals on mineralization trapping of CO_2 in saline aquifers

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Petroleum Science 2012年第3期9卷 400-407页

作者： LUO shu XU Ruina jiang Peixue Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing Key Laboratory of CO_(2) Utilization and Reduction TechnologyDepartment of Thermal EngineeringTsinghua UniversityBeijing 100084China

The reactive surface area, an important parameter controlling mineral reactions, affects the amount of mineralization trapping of CO2 which affects the long-term CO2 storage. The effect of the reactive surface area on the mineralization trapping of CO2 was numerically simulated for CO2 storage in saline aquifers. Three kinds of minerals, including anorthite, calcite and kaolinite, are involved in the mineral reactions. This paper models the relationship between the specific surface area and the grain diameter of anorthite based on experimental data from literature （Brantley and Mellott, 2000）. When the reactive surface areas of anorthite and calcite decrease from 838 to 83.8 m^2/m^3, the percentage of mineralization trapping of CO： after 500 years decreases from 11.8% to 0.65%. The amount of dissolved anorthite and the amounts of precipitated kaolinite and calcite decrease significantly when the reactive surface areas ofanorthite and calcite decrease from 838 to 83.8 m2/m3. Calcite is initially dissolved in the brine and then precipitates during the geochemical reactions between CO2-H20 and the minerals. Different reactive surface areas of anorthite and calcite lead to different times from dissolution to precipitation. The pH of the brine decreases with decreasing reactive surface areas of anorthite and calcite which influences the acidity of the saline aquifer. The gas saturation between the upper and lower parts of the saline aquifer increases with decreasing reactive surface areas of anorthite and calcite. The mass density distribution of brine solution shows that the CO2^＋brine solution region increases with decreasing reactive surface areas ofanorthite and calcite.

关键词： Reactive surface area, mineralization trapping, dissolution precipitation, brine mass density,CO2 geological storage

Two‑Dimensional Cr_(5)Te_(8)@Graphite Heterostructure for Efficient Electromagnetic Microwave Absorption

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Nano-Micro Letters 2024年第3期16卷 407-422页

作者： Liyuan qin Ziyang Guo shuai Zhao Denan Kong Wei jiang Ruibin Liu Xijuan Lv Jiadong Zhou qinghai shu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081People’s Republic of China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081People’s Republic of China Tangshan Research Institute Beijing Institute of TechnologyTangshan 063099People’s Republic of China

Two-dimensional(2D)transition metal chalcogenides(TMCs)hold great promise as novel microwave absorption materials owing to their interlayer interactions and unique magnetoelectric ***,overcoming the impedance mismatch at the low loading is still a challenge for TMCs due to the restricted loss pathways caused by their high-density ***,an interface engineering based on the heterostructure of 2D Cr_(5)Te_(8) and graphite is in situ constructed via a one-step chemical vapor deposit to modulate impedance matching and introduce multiple attenuation ***,the Cr_(5)Te_(8)@EG(ECT)heterostructure exhibits a minimum reflection loss of up to−57.6 dB at 15.4 GHz with a thin thickness of only 1.4 mm under a low filling rate of 10%.The density functional theory calculations confirm that the splendid performance of ECT heterostructure primarily derives from charge redistribution at the abundant intimate interfaces,thereby reinforcing interfacial polarization ***,the ECT coating displays a remarkable radar cross section reduction of 31.9 dB m^(2),demonstrating a great radar microwave scattering *** work sheds light on the interfacial coupled stimulus response mechanism of TMC-based heterogeneous structures and provides a feasible strategy to manipulate high-quality TMCs for excellent microwave absorbers.

关键词： Chemical vapor deposition Interface polarization engineering Cr_(5)Te_(8)-graphite heterojunctions Microwave absorption