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Effects of upper mantle wind on mantle plume morphology and hotspot track:Numerical modeling

Science China Earth Sciences 2024年第12期67卷 3881-3899页

作者： Jie XIN huai zhang Yaolin SHI Felipe ORELLANA-ROVIROSA College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Beijing Yanshan Earth Critical Zone National Research Station University of Chinese Academy of SciencesBeijing 101408China

A mantle thermal plume may be tilted,deflected,or even split-up by mantle lateral flows(mantle wind)during its ascent,which in turn changes the spatial distribution of various geological-magmatic responses,such as magmatic activity in the overriding plate and hotspot tracks on the surface,affecting the reliability of the constraints on absolute plate motion *** research on tilted mantle plumes has focused mainly on the lower/whole mantle *** mantle plumes formed in whole/layered mantle convection suffer lateral tilt in the upper mantle,and how this affects the magmatic activity along the surface hotspot track as well as the plume-related tectonic processes,are important scientific issues in mantle thermalplume dynamics and plate tectonics *** study introduces a thermal Stokes-fluid-dynamics numerical model(in ASPECT software)and pyrolite parameters constrained by mineral physics data,and quantitatively analyzes the tilted/deflected morphology of upper-mantle plumes and the concomitant surface-hotspot location-evolution characteristics under the combined effects of overriding-plate-motion driven flow(Couette)and upper mantle counter-flow(Poiseuille).We find that this composite upper-mantle wind can lead to(1)Plume head-and-upper-conduit horizontal motion in the opposite direction of the overriding plate motion and also with respect to the conduit roots,such that the magmatic spacing is increased;(2)Near-periodic split-up and ascent of a laterally-moving plume conduit,whose split-up/ascent period depends mainly on the thermo-chemical buoyancy of the plume itself;and(3)Under specific conditions of thermo-chemical buoyancy of a main“parent”plume interacting with upper mantle winds,two secondary“child”plumes hundreds of kilometers apart can sprout and ascend sequentially/subsimultaneously through the upper mantle in a very short period of time(2–4 Myr).The resulting oscillating/jumping behavior of hotspot locations along the overriding pl

关键词： Hotspot track Mantle plume Upper mantle wind Absolute plate motion Plume-derived magmatism Numerical modeling

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Mathematical Basis of Idea That Harmonious Marriage Can Lengthen Life-span

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Acta Mathematicae Applicatae Sinica 2009年第2期25卷 321-326页

作者： Zhi-qiang zhang School of Mathematical Science Xiamen University Xiamen 361005 China

It is a very important issue for us to explore the effects of the marriage to life. In recent years, many scholars have proved that the marriage can lengthen life-span from different angles. With the development of theory of dependence random variables, we discuss the effects of the marriage to life and provide a mathematical basis of the idea that the harmonious marriage can lengthen life-span in this paper. Meanwhile, we analyze the impact of the marriage on life on the basis of the net single premium.

关键词： Marriage joint-life status last survivor status comonotonicity copula

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Dynamics analysis for flux of carbon dioxide across seasurface

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Acta Oceanologica Sinica 1996年第4期15卷 447-455页

作者： zhang huai and Sun Fu Ocean University of Qingdao Qingdao 266003 China

The CO2 exchange between atmosphere and seawater has ho discussed. The physical process of exchange at seasurface is related closely with the atmospheric forcing. The result of a dynamics analysis of .the CO2 flux across the seasurface, and a computed example over the shelf area of the East China Sea are reported. The analysis and calculation show that the CO2 vertical flux at seawater is mainly dependent on the CO2 concentration difference between seawater and atmosphere. Its exchange velocity is affected by the friction velocity, solubility and resistivity. The agreement between this exchange velocity and recent wind tunnel experimental results is good with wind speed over the range4～ 10m/s. This flux can increase very fast with the increase of wind speed, but very small with the increase oftemperature. During the three cruise expeditions in October 1993, and April and October 1994, the CO2 vertical flux at seasurface was directed downward over the shelf area of the East China Sea. Because the CO2 Partial pressure difference between seawater and atmosphere was negative value, the flux value was - 45. 5μg/(m2.h) in average.

关键词： Friction velocity diffusivity solubility resistivity

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State observers of quasi-reversible discrete-time switched linear systems

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Control Theory and Technology 2023年第3期21卷 390-396页

作者： Zhendong Sun qiang zhang College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

This work addresses observer design for the general class of quasi-reversible discrete-time switched linear *** the mild assumption that the switched system is observable,we present constructive approaches to design state observers to estimate the *** types of observers are designed:one is with full order and the other is with reduced order,both could reconstruct the system state in finite times.A numerical example is presented to illustrate the effectiveness of the proposed approaches.

关键词： Switched linear systems Observer-Observability

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Experimental and Numerical Study of an 80-kW Zigzag Printed Circuit Heat Exchanger for Supercritical CO_(2)Brayton Cycle

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Journal of Thermal Science 2021年第4期30卷 1289-1301页

作者： zhang Huzhong CHENG Keyong huai Xiulan ZHOU Jingzhi GUO Jiangfeng Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

In this study,an experimental system was built to investigate the global performance of an 80-k W zigzag printed circuit heat exchanger(PCHE).It could meet the requirement of the pre-cooler for the supercritical carbon dioxide(S-CO_(2))Brayton power cycle and the modified effectiveness considering the pinch point is between 61.5%and 79.3%.When the outlet S-CO_(2)temperature is near the pseudo-critical point,the thermo-physical properties have more effects on heat transfer performance compared to flow *** the local performance,the mass flow rates of both sides have crucial influences on the location where the peak of S-CO_(2)Nusselt number occurs while only the S-CO_(2)flow rate affects the variation of the peak *** addition,the influence of the radius of curvature on the secondary-flow should not be *** the end,new empirical correlations were proposed considering the drastic variations of the Prandtl number.

关键词： Printed Circuit Heat Exchanger(PCHE) supercritical carbon dioxide(S-CO_(2)) pre-cooler zigzag channel thermal-hydraulic performance

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NADPH homeostasis in cancer:functions,mechanisms and therapeutic implications

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Signal Transduction and Targeted Therapy 2020年第1期5卷 518-529页

作者： huai-qiang Ju Jin-Fei Lin Tian Tian Dan Xie Rui-Hua Xu State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer MedicineSun Yat-sen University Cancer CenterSun Yat-sen University510060 GuangzhouChina Research Unit of Precision Diagnosis and Treatment for Gastrointestinal Cancer Chinese Academy of Medical Sciences510060 GuangzhouChina

Nicotinamide adenine dinucleotide phosphate(NADPH)is an essential electron donor in all organisms,and provides the reducing power for anabolic reactions and redox *** homeostasis is regulated by varied signaling pathways and several metabolic enzymes that undergo adaptive alteration in cancer *** metabolic reprogramming of NADPH renders cancer cells both highly dependent on this metabolic network for antioxidant capacity and more susceptible to oxidative *** the unique NADPH homeostasis of cancer cells might be an effective strategy to eliminate these *** this review,we summarize the current existing literatures on NADPH homeostasis,including its biological functions,regulatory mechanisms and the corresponding therapeutic interventions in human cancers,providing insights into therapeutic implications of targeting NADPH metabolism and the associated mechanism for cancer therapy.

关键词： homeostasis therapeutic metabolism

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Dynamic simulation of interactions between major earthquakes on the Xianshuihe fault zone

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Science China Earth Sciences 2008年第10期51卷 1388-1400页

作者： WANG Hui LIU Jie SHI YaoLin zhang huai zhang GuoMin Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China Laboratory of Computational Geodynamics Graduate University of Chinese Academy of SciencesBeijing 100049China China Earthquake Network Center China Earthquake AdministrationBeijing 100045China

The authors firstly evaluate the strain accumulation rate of the Xianshuihe fault zone based on earthquake activity. We calculated the stress and seismic moment accumulation rate for each subsection of the Xianshuihe fault zone based on the distribution of geological slip rate and GPS survey results. According to the results, we get the recurrence intervals of characterized earthquakes on each subsection respectively. A three-dimensional finite element model for western Sichuan is constructed to discuss the earthquakes triggering among major earthquakes ({ntM}>6.7) that occurred along the Xianshuihe fault zone since 1893. The calculated Coulomb failure stress changes (?CFS) show that 5 of the 6 earthquakes with Ms>6.7 were triggered by positive ?CFS. The interactions between major earthquakes not only influence recurrence intervals of characterized earthquakes on each subsection, but also change recurrence behavior of major earthquakes along the whole fault zone.

关键词： Xianshuihe fault zone strain accumulation and releasing recurrence interval finite element method Coulomb failure stress changes

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Investigation on steelmaking dust recycling and iron oxide red preparing

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Journal of University of Science and Technology Beijing 2008年第1期15卷 24-28页

作者： Pingfeng Fu qiang zhang College of Arts ＆ Science Beijing Union University Beijing 100083 China School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

To investigate the physical and chemical properties of the steelmaking dust, wet sieve separation, XRD, SEM, EDS, and traditional chemical analysis were carded out to obtain the particle size distribution, mineralogy, morphology, and the chemical composition of the dust. The dust with a total Fe content of 64.08wt% has coarse metallic iron, magnetite and hematite grains, while free clay minerals with a size of 〈38 μm are mainly iosidefite, calcium silicate, and calcite, which are conglomerated to each other. By following the procedures of wet magnetic separation, acid leaching, and oxidization calcination, magnetic materials were recycled and further prepared as iron oxide red with a productivity of 0.54 ton per unit ton of the dust. Middle iron concentrate with an Fe content of 65.92wt% can be reused as feeding material in the ironmaking industry. Additionally, washed water from acid leaching with an Fe^3＋ ion content of less than 5 g·L^-1 was recovered as feeding water in the wet magnetic separation procedure. 2008 University of Science and Technology Beijing. All fights reserved.

关键词： steelmaking dust iron oxide red wet magnetic separation acid leaching

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Advanced metal sulfide anode for potassium ion batteries

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Journal of Energy Chemistry 2018年第2期27卷 373-374页

作者： Tao Li qiang zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua University

Potassium-ion batteries（KIBs） are a promising alternative to lithium-ion batteries owning to the abundance of potassium on Earth and the relatively low K/K＋redox couple. To date, KIBs remains its infancy and the investigation of anode materials mainly focused on carbon-based materials, which deliver limited reversible capacity. Hence, it is imperative to explore alternative anode materials with high reversible capacity for KIBs. Recently, a pioneering work from Chen’s group reported a nanocomposite of Sb2S3 nanoparticles anchored on porous S,N-codoped graphene（denoted as Sb2S3-SNG） as an advanced anode material for KIBs, which exhibited remarkable enhancements of both capacity and cycling stability, highlighting the rational structure design of Sb2S3-SNG for maximum utilization of Sb2S3 nanoparticles and graphene layers for energy storage applications in high-performance KIBs.

关键词： Potassium ion batteries Metal sulfide Graphene Energy materials

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A Framework of Massively Parallel Analysis of Regional Earthquake Activities

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Acta Geologica Sinica(English Edition) 2009年第4期83卷 786-800页

作者： zhang huai SHI Yaolin WU Zhongliang Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Geophysics China Earthquake Administration Beijing 100080 China

Recent rapid progress in cyberinfrastructure in geosciences is providing seismologists an enormous boost for addressing multi-physical phenomena of regional seismic activities. The inherent nature of their multi-scale properties, from temporal to spatial spaces, makes it inevitably to be solved using large-scale computations and distributed parallel data processing schemes. Under such circumstance, using the advanced numerical algorithms and unstructured mesh generation technologies become the obstacles for modern seismologists. The main objective of this paper is to present a framework, which includes a parallel finite element simulation and distributed data infrastructure, to address the novel algorithms, state-of-the-art modeling and their implementation in regional seismicgenic systems. We also discuss and implement this framework to analyze the strong earthquake evolution processes in the Sichuan-Yunnan region. This study is the key to long-term seismic risk by estimates, providing a platform for predictive large-scale numerical simulation modeling of regional earthquake activities.

关键词： regional earthquake activities parallel numerical modeling initial stress field Sichuan- Yunnan area

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