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A consistent projection-based SUPG/PSPG XFEM for incompressible two-phase flows

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Acta Mechanica Sinica 2012年第5期28卷 1309-1322页

作者： jian-Hui liao Zhuo Zhuang School of Aerospace Tsinghua University

In this paper, a consistent projection-based streamline upwind/pressure stabilizing Petrov-Galerkin （SUPG/PSPG） extended finite element method （XFEM） is presented to model incompressible immiscible two-phase flows. As the application of linear elements in SUPG/PSPG schemes gives rise to inconsistency in stabilization terms due to the inability to regenerate the diffusive term from viscous stresses, the numerical accuracy would deteriorate dramatically. To address this issue, projections of convection and pressure gradient terms are constructed and incorporated into the stabilization formulation in our method. This would substantially recover the consistency and free the practitioner from burdensome computations of most items in the residual. Moreover, the XFEM is employed to consider in a convenient way the fluid properties that have interfacial jumps leading to discontinuities in the velocity and pressure fields as well as the projections. A number of numerical examples are analyzed to demonstrate the complete recovery of consistency, the reproduction of interfacial discontinuities and the ability of the proposed projection-based SUPG/PSPG XFEM to model two-phase flows with open and closed interfaces.

关键词： Two-phase flow XFEM SUPG/PSPG algorithm Consistency Discontinuous projection

CT联合肿瘤标志物预测肺结节低分化腺癌的模型构建

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中国胸心血管外科临床杂志 2025年第1期32卷 73-79页

作者：蒋捷刘锋王波王芹钟健南京医科大学附属脑科医院胸外科南京210029

目的根据CT影像及肿瘤标志物结果,建立低分化腺癌预测模型,并进行内部验证。方法选择2023年在南京医科大学附属脑科医院胸外科行手术治疗的实性与部分实性肺结节患者,按照7∶3比例将患者随机分为训练集和验证集。收集患者CT特征,包括结... 详细信息

目的根据CT影像及肿瘤标志物结果,建立低分化腺癌预测模型,并进行内部验证。方法选择2023年在南京医科大学附属脑科医院胸外科行手术治疗的实性与部分实性肺结节患者,按照7∶3比例将患者随机分为训练集和验证集。收集患者CT特征,包括结节平均密度值、最大直径、胸膜牵拉征和支气管充气征,以及肿瘤标志物结果。依据术后病理结果,将患者分为低分化腺癌组和非低分化腺癌组。对训练集采用单因素分析和logistic回归分析,并以此建立预测模型,采用受试者工作特征(receiver operating characteristic,ROC)曲线评估模型区分度,校准曲线评估模型的一致性,绘制决策曲线评估该模型的临床价值,并在验证集中校验模型。结果共纳入299例患者,其中男103例、女196例,中位年龄57.00(51.00,67.25)岁;训练集211例,验证集88例。多因素分析显示癌胚抗原(CEA)值[OR=1.476,95%CI(1.184,1.983),P=0.002]、细胞角蛋白19片段抗原(CYFRA21-1)值[OR=1.388,95%CI(1.084,1.993),P=0.035]、肿瘤最大直径[OR=6.233,95%CI(1.069,15.415),P=0.017]、肿瘤平均密度[OR=1.083,95%CI(1.020,1.194),P=0.040]是实性与部分实性肺结节低分化腺癌的独立危险因素。基于此构建预测模型,ROC曲线下面积为0.896[95%CI(0.810,0.982)],最大约登指数对应截点值为0.103,灵敏度为0.750,特异度为0.936。bootstrap法抽样1000次,校准曲线图预测概率与实际风险一致。决策曲线分析表明,在全预测概率下均有正收益,有较好临床价值。结论对于实性与部分实性肺结节患者,术前使用CT测量肿瘤平均密度值、最大直径,同时联合肿瘤标志物CEA、CYFRA21-1值可有效预测结节是否为低分化腺癌,以尽早予以干预。

关键词：计算机断层显像肿瘤标志物肺结节低分化腺癌预测模型列线图

A Parallel-type Load Damping Factor Controller for Frequency Regulation in Power Systems with High Penetration of Renewable Energy Sources

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1019-1030页

作者： Zhe Zhang Siyang liao Yuanzhang Sun jian Xu Deping Ke bo Wang Rui Chen Yibo jiang Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network School of Electrical Engineering and AutomationWuhan UniversityWuhan 430072China State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan 430074China State Grid(Suzhou)City&Energy Research Institute Company Limited Suzhou 215000China

Renewable energy sources(RESs)are rapidly devel-oping and their substitution for traditional power generation poses significant challenges to the frequency regulation in power *** load damping factor D characterizes the active power of load that changes with power system frequency,which is an important factor influencing the frequency ***,the value of D is small,resulting in the limitation in frequency regulation of the power *** paper proposes a parallel-type load damping factor controller to enhance load damping factor by utilizing static var generators(SVGs)in ***,it discusses the configuration method for the relevant parameters of the controller,evaluates its frequen-cy regulation capability,investigates the impact of large-scale application of the controller on static and dynamic loads,and conducts a comprehensive evaluation of the impact of the damping factor control process on the voltage stability of the main *** large-scale application of the proposed controller can significantly improve the frequency regulation capability,and almost have no influence on the working status of the *** can also significantly improve the dynamic performance of system *** proposed controller can provide technical support for the frequency regulation of new power systems with high proportion of RESs.

关键词： Load damping factor parallel-type load damping factor controller power system frequency regulation highproportion renewable energy system

Clinicopathological features and trend changes of gastric carcinoma in Southern China

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World Journal of Gastroenterology 2014年第15期20卷 4401-4406页

作者： jian-Jun Peng Ping Xiao jian-bo Xu Wu Song Bing liao Yu-Long He Department of Gastrointestinal Surgery the First Affiliated HospitalSun Yat-sen University Gastric cancer center Sun Yat-sen University Department of Pathology the First Affiliated HospitalSun Yat-sen University

AIM: To investigate the clinicopathological features of gastric carcinoma in southern China and disease trends changes over the last 18 years.

关键词： Gastric carcinoma Retrospective study Clinicopathological features Southern China Youth

Some characteristics of logistic map over the finite field

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Science China(Information Sciences) 2019年第3期62卷 199-201页

作者： bo YANG Xiaofeng liao Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing College of Electronic and Information Engineering Southwest University

Dear editor,Chaotic maps have good characteristics, which include randomness, sensitivity to the initial value,and unpredictability. Hence, there have been many attempts to discuss the dynamic behavior of chaotic maps... 详细信息

关键词： Some characteristics of logistic map over the finite field

On Laguerre Form and Laguerre Isoparametric Hypersurfaces

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Acta Mathematica Sinica,English Series 2015年第3期31卷 501-510页

作者： jian bo FANG Department of Mathematics Tongji University School of Mathematics and Statistics Chuxiong Normal University

Let x ： M^n-1→ R^nbe an umbilical free hypersurface with non-zero principal curvatures.M is called Laguerre isoparametric if it satisfies two conditions, namely, it has vanishing Laguerre form and has constant Lauerre principal curvatures. In this paper, under the condition of having constant Laguerre principal curvatures, we show that the hypersurface is of vanishing Laguerre form if and only if its Laguerre form is parallel with respect to the Levi-Civita connection of its Laguerre metric.

关键词： Laguerre isoparametric hypersurface Laguerre second fundamental form Laguerre metric Laguerre form parallel Laguerre form

An online fast multi-track locating algorithm for high-resolution single-event effect test platform

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Nuclear Science and Techniques 2023年第5期34卷 86-100页

作者： Yu-Xiao Hu Hai-bo Yang Hong-Lin Zhang jian-Wei liao Fa-Tai Mai Cheng-Xin Zhao Institute of modern physics Chinese Academy of SciencesLanzhou 730000China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516003China University of Chinese Academy of Sciences Beijing 100049China

To improve the efficiency and accuracy of single-event effect(SEE)research at the Heavy Ion Research Facility at Lanzhou,Hi’Beam-SEE must precisely localize the position at which each heavy ion hitting the integrated circuit(IC)causes *** this study,we propose a fast multi-track location(FML)method based on deep learning to locate the position of each particle track with high speed and *** can process a vast amount of data supplied by Hi’Beam-SEE online,revealing sensitive areas in real *** is a slot-based object-centric encoder-decoder structure in which each slot can learn the location information of each track in the *** make the method more accurate for real data,we designed an algorithm to generate a simulated dataset with a distribution similar to that of the real data,which was then used to train the *** comparison experiments demonstrated that the FML method,which has the best performance on simulated datasets,has high accuracy on real datasets as *** particular,FML can reach 238 fps and a standard error of 1.6237μ*** study discusses the design and performance of FML.

关键词： Beam tracks Multi-track location Rapid location High accuracy Synthetic data Deep neural network Single-event effects Silicon pixel sensors HIRFL

Profiling of microbial communities in a bioreactor for treating hydrocarbon-sulfide-containing wastewater

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Journal of Environmental Sciences 2008年第8期20卷 897-899页

作者： liao bo Ji Guodong Cheng Liqiu Peking Univ Shenzhen Grad Sch Key Lab Urban Human Residential Environm Sci & Te Shenzhen 518055 Peoples R China Peking Univ Dept Environm Engn Key Lab Water & Sediment Sci Minist Educ Beijing 100871 Peoples R China

A technology of polymerase chain reaction-denaturing gradient gel electrophoresis(PCR-DGGE)was used to profile the structure and dynamic changes of microbial communities in a bioreactor for treating hydrocarbon-sulfide-containing(HSC)*** results showed that the heterotrophic genus of Acinetobacter and the autotrophic genera of Thiobacillus and Thiomonas could survive well in all of three operating *** special genera were also observed with changes of micro-ecoenvironment in the reacto...

关键词： hydrocarbon-sulfide-containing wastewater biological sulfide oxidation microbial ecology PCR-DGGE

A PROJECTION-TYPE METHOD FOR SOLVING VARIOUS WEBER PROBLEMS

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Journal of Computational Mathematics 2006年第4期24卷 527-538页

作者： jian-lin jiang bo Chen Department of Mathematics Nanjing University Nanjing 210093 China

This paper investigates various Weber problems including unconstrained Weber problems and constrained Weber problems under l1, l2 and l∞-norms. First with a transformation technique various Weber problems are turned into a class of monotone linear variational inequalities. By exploiting the favorable structure of these variational inequalities, we present a new projection-type method for them. Compared with some other projection-type methods which can solve monotone linear variational inequality, this new projection-type method is simple in numerical implementations and more efficient for solving this class of problems; Compared with some popular methods for solving unconstrained Weber problem and constrained Weber problem, a singularity would not happen in this new method and it is more reliable by using this new method to solve various Weber problems.

关键词： Linear variational inequality Various Weber problems Projection-type method Slack technique.