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Focal Mechanism and Rupture Process of the 2012 M_w 7.0 Santa Isabel, Mexico Earthquake Inverted by Teleseismic Data

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Journal of Earth Science 2015年第3期26卷 384-390页

作者： Chengli Liu Yong Zheng xiong xiong State Key Laboratory of Geodesy and Earth's Dynamic Institute of Geodesy and Geophysics Chinese Academy of Sciences

The point source parameters of the April 12, 2012 Mw 7.0 Santa Isabel, Mexico, earthquake indicated by teleseismic P and SH waveforms obtained by a means of traditional cut and paste（CAP） method show that the best double-couple solution of this event is： 37°/127°, 90°/81° and-9°/-180° for strike, dip and rake, respectively. Its centroid depth is 13 km. Global teleseismic waveform data exhibit that the rupture of the earthquake initiated at a focal depth of 13 km and propagated southeastward with a relatively slow rupture velocity（about 1.8 km/s on average）. The maximum slip occurred at 30 km southeast of the hypocenter, with the peak slip of 3.57 m and total seismic moment of whole fault up to 3.98×1019 N·m. These observations provide some insight into properties, co- or post-seismic deformation and coulomb stress changes of future earthquake in this area.

关键词： Mexico Earthquake rupture velocity focal mechanism slip history

Impacts of uneven surface heating of an ideal street canyon on airflows and indoor ventilation:Numerical study using OpenFOAM coupled with EnergyPlus

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Building Simulation 2022年第2期15卷 265-280页

作者： Yuya xiong Hong Chen School of Architecture and Urban Planning Huazhong University of Science and TechnologyWuhanHubei430000China

In the daytime,building facades and ground surfaces are heated by solar radiation,and the resulting buoyancy can change the flow field inside street *** this study,the impacts of uneven and time-varying heating of surfaces inside an ideal urban street canyon(aspect ratio=1)on single-sided indoor natural ventilation are *** work introduces a methodology for a numerical approach based on the coupling between a computational fluid dynamics(CFD)model and an energy balance ***,EnergyPlus is employed to calculate the time-varying and uneven surface *** are performed at four typical study times(05:00,09:00,15:00,20:00)during a hot summer day(July 15)in Wuhan,***,the surface temperature results are transferred to OpenFOAM for CFD *** inlet wind velocities(U_(ref))are *** results show that for a relatively strong ambient wind(U_(ref)=3 m/s),the buoyancy caused by surface heating does not significantly change the airflow structures and indoor ventilation compared with those in the isothermal ***,for a weak ambient wind(U_(ref)=0.5 m/s),the airflow structures inside the street canyon vary with the time of ***,the average air exchange rate(ACH)differs by-25.0% to 15.9%compared with that in the isothermal case,and the ACH of a single room increases by up to 2710%.The results indicate that the surface-heating-induced buoyancy is nonnegligible and should be carefully investigated,especially for weak ambient winds.

关键词： uneven surface temperature indoor ventilation urban canyon OpenFOAM EnergyPlus

Atg7 in development and disease： panacea or Pandora＇s Box？

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Protein & Cell 2015年第10期6卷 722-734页

作者： Jianhua xiong Center for Molecular Medicine National Heart Lung and Blood Institute National Institutes of Health Bethesda MD 20892USA

Macroautophagy is an evolutionarily conserved intracellular degradation system used by life ranging from yeasts to mammals. The core autophagic machinery is composed of ATG （autophagy-related） protein constituents. One particular member of the ATG protein family, Atg7, has been the focus of recent research. Atg7 acts as an Ellike activating enzyme facilitating both microtubule-associated protein light chain 3 （LC3）- phosphatidylethanolamine and ATG12 conjugation. Thus, Atg7 stands at the hub of these two ubiquitin-like systems involving LC3 and Atg12 in autophagic vesicle expansion. In this review, I focus on the pleiotropic function of Atg7 in development, maintenance of health, and alternations of such control in disease.

关键词： autophagy Atg7 mouse model,development disease

An approach to error elimination for multi-axis CNC machining and robot manipulation

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Science China(Technological Sciences) 2007年第5期50卷 560-574页

作者： xiong CaiHua School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

The geometrical accuracy of a machined feature on a workpiece during machining processes is mainly affected by the kinematic chain errors of multi-axis CNC ma- chines and robots, locating precision of fixtures, and datum errors on the work- piece. It is necessary to find a way to minimize the feature errors on the workpiece. In this paper, the kinematic chain errors are transformed into the displacements of the workpiece. The relationship between the kinematic chain errors and the dis- placements of the position and orientation of the workpiece is developed. A map- ping model between the displacements of workpieces and the datum errors, and adjustments of fixtures is established. The suitable sets of unit basis twists for each of the commonly encountered types of feature and the corresponding locating di- rections are analyzed, and an error elimination (EE) method of the machined feature is formulated. A case study is given to verify the EE method.

关键词： error elimination, multi-axis machine, robot manipulation, kinematic chain, twist

Finite Groups Whose Character Graphs Associated with Codegrees Have No Triangles

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Algebra Colloquium 2016年第1期23卷 15-22页

作者： Huan xiong Institut fur Mathematik Universitat Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland

Motivated by Problem 164 proposed by Y. Berkovich and E. Zhmud＇ in their book ＂Characters of Finite Groups＂, we give a characterization of finite groups whose irreducible character codegrees are prime powers. This is based on a new kind of character graphs of finite groups associated with codegrees. Such graphs have close and obvious connections with character codegree graphs. For example, they have the same number of connected components. By analogy with the work of finite groups whose character graphs （associated with degrees） have no triangles, we conduct a result of classifying finite groups whose character graphs associated with codegrees have no triangles in the latter part of this paper.

关键词： finite group character graph codegree

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低氧暴露后大鼠外周血及骨髓红系的变化

中国组织工程研究 2025年第25期29卷 5390-5395页

作者：熊华李金杰王璐马婕青海大学附属医院(临床医学院) 青海省西宁市810001

背景:低氧暴露下大鼠外周血红细胞变化与骨髓有核红细胞增殖变化相关。低氧诱导因子、促红细胞生成素等相关调控因素参与其中。目的:探讨大鼠低氧暴露后外周血红细胞及骨髓有核红细胞的变化特点及相关因素。方法:模拟海拔5000 m的低压... 详细信息

背景:低氧暴露下大鼠外周血红细胞变化与骨髓有核红细胞增殖变化相关。低氧诱导因子、促红细胞生成素等相关调控因素参与其中。目的:探讨大鼠低氧暴露后外周血红细胞及骨髓有核红细胞的变化特点及相关因素。方法:模拟海拔5000 m的低压低氧环境建立实验大鼠模型,对照组大鼠饲养在海拔2260 m的实验室内,对比低氧暴露前后大鼠血常规、骨髓有核红细胞比例及低氧诱导因子、促红细胞生成素等相关指标。结果与结论:①实验组大鼠外周血红细胞计数、血红蛋白、红细胞压积等指标较对照组升高(P<0.05);②实验组大鼠骨髓CD71^(+)有核红细胞比例较对照组升高(P<0.05);③实验组大鼠骨髓CD71^(+)有核红细胞中低氧诱导因子2α表达水平较对照组升高(P<0.05);④实验组大鼠骨髓上清液促红细胞生成素水平较对照组升高(P<0.05)。结果表明,低氧暴露后大鼠外周血红细胞及骨髓有核红细胞比例增高,可能与骨髓有核红细胞中低氧诱导因子2α及骨髓上清液中促红细胞生成素水平增高有关。

关键词：低氧大鼠外周血红细胞骨髓有核红细胞

Optimal Neuro-Control Strategy for Nonlinear Systems With Asymmetric Input Constraints

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IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 575-583页

作者： xiong Yang Bo Zhao School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China School of Systems Science Beijing Normal UniversityBeijing 100875China

In this paper,we present an optimal neuro-control scheme for continuous-time(CT)nonlinear systems with asymmetric input ***,we introduce a discounted cost function for the CT nonlinear systems in order to handle the asymmetric input ***,we develop a Hamilton-Jacobi-Bellman equation(HJBE),which arises in the discounted cost optimal control *** obtain the optimal neurocontroller,we utilize a critic neural network(CNN)to solve the HJBE under the framework of reinforcement *** CNN's weight vector is tuned via the gradient descent *** on the Lyapunov method,we prove that uniform ultimate boundedness of the CNN's weight vector and the closed-loop system is ***,we verify the effectiveness of the present optimal neuro-control strategy through performing simulations of two examples.

关键词： Adaptive critic designs(ACDs) asymmetric input constraint critic neural network(CNN),nonlinear systems optimal control reinforcement learning(RL)

BMPR2 spruces up the endothelium n pulmonary hypertension

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Protein & Cell 2015年第10期6卷 703-708页

作者： Jianhua xiong Center for Molecular Medicine National Heart Lung and Blood Institute National Institutes of Health Bethesda MD 20892USA

Pulmonary hypertension （PH） is a potentially lethal disorder because of a dearth of effective therapeutic options （Schermuly et al., 2011; Mehari et al., 2014）. Pulmonary arterial hypertension （PAH） is a major type of PH that is defined by a mean pulmonary arterial pressure higher than 25 mm Hg at rest or 30 mm Hg during exercise （Kovacs et al., 2009）.

关键词： endothelium pulmonary hypertension

On a Discrete Version of Alexandrov's Projection Theorem

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Acta Mathematica Sinica,English Series 2013年第8期29卷 1597-1606页

作者： Huan xiong School of Mathematical Sciences Peking University

In this paper, we consider a discrete version of Aleksandrov＇s projection theorem. We prove that an origin-symmetric convex lattice set, whose lattice＇s y-coordinates＇ absolute values are not bigger than 2, can be uniquely determined by its lattice projection counts if its cardinality is not 11. This partly answers a question on the discrete version of Aleksandrov＇s projection theorem which was proposed by Gardner, Gronchi and Zong in 2005.

关键词： Aleksandrov's projection theorem convex lattice set discrete geometry