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EXISTENCE AND CONVERGENCE RESULTS FOR AN ELASTIC FRICTIONAL CONTACT PROBLEM WITH NONMONOTONE SUBDIFFERENTIAL BOUNDARY CONDITIONS

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Acta Mathematica Scientia 2021年第4期41卷 1151-1168页

作者： yongjian liu Stanisiaw MIGÓRSKI Van Thien NGUYEN Shengda ZHENG Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin Normal UniversityYulin 537000China College of Applied Mathematics Chengdu University of Information TechnologyChengdu 610225China Jagiellonian University in Krakow Chair of Optimization and Controlul.Lojasiewicza 630348 KrakowPoland Departement of Mathematics FPT UniversityEducation ZoneHoa Lac High Tech ParkKm29 Thang Long HighwayThach That WardHanoiVietnam

The goal of this paper is to study a mathematical model of a nonlinear static frictional contact problem in elasticity with the mixed boundary conditions described by a combination of the Signorini unilateral frictionless contact condition,and nonmonotone multivalued contact,and friction laws of subdifferential ***,under suitable assumptions,we deliver the weak formulation of the contact model,which is an elliptic system with Lagrange multipliers,and which consists of a hemivariational inequality and a variational ***,we prove the solvability of the contact ***,employing the notion of H-convergence of nonlinear elasticity tensors,we provide a result on the convergence of solutions under perturbations which appear in the elasticity operator,body forces,and surface tractions.

关键词： Mixed variational-hemi variational inequality H-convergence homogenization Clarke subgradient Lagrange multiplier elasticity operator

Safety and efficacy of complete versus near-complete coiling in treatment of intracranial aneurysms

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Journal of Interventional Medicine 2020年第3期3卷 136-141页

作者： Guogdong Zhang Yongsheng liu yongjian liu Mingyi Wang Ke Li Feng Wang Intervention Therapy Department of the First Affiliated Hospital of Dalian Medical University China

Objective:This study aimed to evaluate the clinical and angiographic outcomes of aneurysms that were completely or near-completely embolized and ascertain whether complete embolization is important in the stent-assisted coiling(SAC)of intracranial ***:This retrospective study enrolled 390 patients(417 aneurysms).Among them,complete(100%)or nearcomplete(>90%)angiographic obliteration of the aneurysms on immediate angiography was *** characteristics,complications,angiography follow-up results,and clinical outcomes were ***:Cumulative adverse events occurred in 30 patients(7.7%),including thromboembolic complications in 17(4.4%),intraoperative rupture in 10(2.6%),and others in 3(0.8%).Statistical analyses revealed an increased intraprocedural rupture rate in the initial completely occluded aneurysms(5.6%compared with 1.0%).The incidence of cumulative adverse events was higher in patients with completely occluded aneurysms(11.1%)than in those with near-completely occluded aneurysms(5.5%).Angiography follow-up was available for 173 *** occlusion status at follow-up was correlated with stent placement(p?0.000,odds ratio?5.847),size(p?0.000,odds ratio?6.446 for tiny aneurysms;and p?0.001,odds ratio?5.616 for small aneurysms),and initial aneurysm occlusion status(p?0.001,odds ratio?3.436).Complete occlusion at followup was seen in 82.6%of the initial complete occlusion group versus 63.0%of the initial near-complete occlusion *** incidence of complete occlusion at follow-up was higher in the initial completely occluded aneurysms with SAC(100%)than in the initial completely occluded aneurysms with non-SAC(65.2%).Conclusions:Initial complete treatment may lead to higher complication rates and good clinical outcomes at *** placement may enhance progressive aneurysm *** complete occlusion with SAC can provide durable closure at follow-up.

关键词： Coil embolization Intracranial aneurysm Stent

Double-composite rectangular truss bridge and its joint analysis

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Journal of Traffic and Transportation Engineering(English Edition) 2015年第4期2卷 249-257页

作者： yongjian liu Zhihua Xiong Yalin Luo Gao Cheng Ge liu Jian Yang School of Highway Chang'an University CCCC First Highway Consultants Co. Ltd. Department of Civil Engineering The City College of New York Mc Laren Engineering Group

This paper describes a novel composite tubular truss bridge with concrete slab and concrete-filled rectangular chords. With concrete slab plus truss system and joints rein- forced with concrete and Perfobond Leiste rib, double composite truss bridge proved to be a fairly suitable solution in negative moment area. Perfobond Leiste shear connector （PBL） is widely implemented in the composite structure for its outstanding fatigue resistance. In this pilot bridge, Perfobond Leister ribs （PBR） were installed in the truss girder＇s joints, which played double roles as shear connector and stiffener. An erection method and overall bridge structural analysis were then presented. Typical joints in the pilot bridge were selected to analyze the effect of PBR. Investigation of the effect of PBR in concrete- filled tubular joints was elaborated. Comparison has revealed that concrete-filled tubular joints with PBR have much higher constraint capability than joints without PBR. For rect- angular tubular truss, the punching shear force of the concrete filled joint with PBR is approximately 43% larger than that of the joint without PBR. Fatigue performance of the joint installed with PBR was improved, which was found through analysis of the stress concentration factor of joint. The PBR installed in the joints mitigated the stress concen- tration factor in the chord face. Therefore, the advantages of this new type of bridge are demonstrated, including the convenience of construction using rectangular truss, inno- vative concept of structural design and better global and local performances.

关键词： Bridge engineeringComposite truss bridgeloint analysisPerfobond ribConcrete-filled tube

LPI radar signal detection based on radial integration of Choi-Williams time-frequency image

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Journal of Systems Science & Complexity 2015年第5期28卷 973-981页

作者： yongjian liu Peng Xiao Hongchao Wu Weihua Xiao Science and Technology on Complex Aviation Systems Simulation Laboratory Aviation University of Air Force

This paper mainly revolves the time-frequency image of low probability of intercept(LPI) radar signals and carries out research work on image features selection and extraction and recognition. Since Choi-Williams distribution(CWD) uses the exponential kernel of bilinear generalized class of time-frequency distribution, it has an excellent time-frequency aggregation. And it is suitable for detecting LPI radar signals in a low signal-to-noise ratio(SNR) condition. A radial integration method based on the integral rotating factor is proposed to detect LPI radar signals when the signals' time-frequency image is obtained. First, the digital image processing method is used to preprocess the LPI radar signals' time-frequency images after CWD transformation; then, the radial integration method based on the integral rotating factor is used to detect LPI radar signals in the binary images. The analytic results of real data show that the method has a good performance on detecting LPI radar signals in a low SNR condition. Additionally,the method is simple and takes less logic resources and has the potential of real-time detection of LPI radar signals.

关键词： low probability of intercept (LPI) integral rotating fac-tor signal detection image processing

Luminal/extracellular domains of chimeric CI-M6PR-C proteins interfere with their retrograde endosome-to-TGN trafficking in the transient expression system

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The Journal of Biomedical Research 2018年第4期32卷 245-256页

作者： Fei Chang Na Li Kang Yan Yumin Huang Hongfei Xu yongjian liu Jiangsu Key Laboratory of Xenotransplanation Department of Medical GeneticsNanjing Medical University Department of Orthopedics the First Affiliated Hospital of Nanjing Medical University Department of Pharmacology & Chemical Biology University of Pittsburgh School of Medicine

The membrane trafficking of cation-independent mannose 6-phosphate receptor（CI-M6PR） between the transGolgi network（TGN） and endosomal compartments is not only critical for maintaining lysosomal function but also a well-known event for understanding molecular and cellular mechanisms in retrograde endosome-to-TGN *** it has been well established in literature that the C-terminus of bovine CI-M6PR determines its retrograde trafficking,it remains unclear whether the luminal domain of the protein plays a role on these sorting *** this study,we found that partial deletion of luminal domain of human CI-M6PR mistargeted the mutant protein to nonTGN ***,replacing the luminal domain of both bovine and human CI-M6PR with that from irrelevant membrane proteins such as CD8 or Tac also altered the TGN targeting of the chimeric *** the other hand,only short sequence from HA fused with the transmembrane domain and C-terminus of the receptor,HA-hCIM6PR-tail,resulted in its preferential targeting to TGN as for the full length receptor,strongly suggesting that sorting of the receptor may be influenced by luminal ***,using this luminal truncated form of HA-hCIM6 PR as a model cargo,we found that the trafficking of the chimeric protein was regulated by the retromer complex through interacting with *** conclusion,our study strongly suggested that the disrupted luminal domain from hCI-M6PR or other irrelevant membrane proteins interfere with the process of membrane trafficking and TGN targeting of CI-M6PR.

关键词： CI-M6PR TGN targeting retrograde trafficking SNX5

Application of modern timber structure in short and medium span bridges in China

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第1期1卷 72-80页

作者： Meizhen Fu yongjian liu Na Li Zhiwei Zhang Enzo Siviero School of Highway Chang'an University Department of Architectural Construction IUAV University of Venice

A series of problems about Chinese bridges with short and medium span recent years were analyzed in this paper. The necessity and feasibility of modern timber structure applied in short and medium span bridges in China were also put forward. The results showed that the short and medium span bridges had many problems, such as monotonous structural forms, seri- ous environmental pollution, multiple bridge defects and difficulty in maintenance. With the development of connection and maintenance technology of modern timber structure and its ad- vantages of light self-weight, environmental coordination, high carrying capacity, excellent durability and abundant structural forms, it was necessary and feasible to apply modern timber structure in short and medium span bridges in China. More emphasis on the construction of modern timber structure should be conducted to expand its application scopes and improve the construction proportion of short and medium span timber bridges.

关键词： short and medium span bridges timber structure modern timber bridge application scope

Distinctive roles of Rac1 and Rab29 in LRRK2 mediated membrane trafficking and neurite outgrowth

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The Journal of Biomedical Research 2018年第2期32卷 145-156页

作者： Min Feng Xin Hu Na Li Fan Hu Fei Chang Hongfei Xu yongjian liu Department of Physiology School of Basic Medical Science Nanjing Medical University Nanjing Jiangsu 211166 China Analyticaland testing Center School of Basic Medical Science Nanjing Medical University Nanjing Jiangsu 211166 China.

Parkinson＇s disease（PD） associated leucine-rich repeat kinase 2（LRRK2） mutants have shown pathogenic effects on a variety of subcellular processes. Two small GTPases Rac1 and Rab29 have been indicated as possible downstream effectors participating in LRRK2 signaling but their detail mechanisms remain unclear. In this study, we have used biochemical and cell biology approaches to address whether two GTPases interact with LRRK2 and hence function differently in LRRK2 mediated pathogenesis. Here we show that Rac1 and Rab29 specifically interact with LRRK2 with higher affinity for Rab29 and with different preference in functional domain binding. Mutant Rab29 but not Racl alters the endosome-to-TGN retrograde trafficking of a cargo protein cation-independent mannose-6-phosphate receptor（CI-M6 PR） and its stability. On the other hand, overexpressed wild type Rab29 but not Racl rescued the altered retrograde membrane trafficking induced by the pathogenic mutant LRRK2^（G2019 S）. Furthermore,both Rac1 and Rab29 rescued neurite shortening in differentiated SH-SY5 Y cells induced by LRRK2^（G2019 S）. Our study strongly suggests that Rac1 and Rab29 are involved in distinct functions as downstream effectors in LRRK2 signaling pathways.

关键词： Parkinson's disease LRRK2 Rac1 Rab29 retrograde trafficking

China's Capital Market: Could It Be the Best in the World?

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China's Foreign Trade 2007年第3期 12-19页

作者： Sun yongjian liu Jinliang

The share-list of China's stock market this year is bound to reach 3000 points,' 'Before or after the Beijing Olympic Games, another upward fluctuation of the stock market is sure to emerge in China.' 'The latest statistics show that the total market value of the Shanghai and Shenzhen stock market have surpassed the mark of 10 trillion RMB, surpassing 50% of GDP.' 'Having successfully completed the reform of China's stock market China has achieved a full revolution.

关键词：中国人民大学资本市场股票市场证券金融市场

The predictive value of low T3 syndrome for delayed encephalopathy caused by severe acute carbon monoxide poisoning

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China Medical Abstracts(Internal Medicine) 2022年第1期39卷 15-16页

作者： liu yongjian Dept Emerg Med Harrison Internatl Peace HospHebei Med UnivHengshui 053000

Objective To explore the predictive value of low T3 syndrome(LT3S)for patients with delayed encephalopathy after acute carbon monoxide poisoning(DEACMP).Methods In May 2020,137 severe acute carbon monoxide poisoning(SACMP)patients were selected from Harrison International Peace Hospital Affiliated to Hebei Medical University from January 2019 to January 2020 as *** samples were taken after admission to test thyroid function.

关键词： acute Blood monoxide