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Separated root tip formation associated with a fractured tubercle of dens evaginatus: A case report

World Journal of Clinical Cases 2021年第12期9卷 2944-2950页

作者： Zhi-Fang Wu Ling-Jiao Lu Hai-Yan Zheng Yan Tu Ying Shi zi-huai zhou Lin-Xian Fang Bai-Ping Fu Department of Pediatric Dentistry The Affiliated Hospital of StomatologySchool of StomatologyZhejiang University School of MedicineKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceHangzhou 310006Zhejiang ProvinceChina Department of Prosthodontics The Affiliated Hospital of StomatologySchool of StomatologyZhejiang University School of MedicineKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceHangzhou 310006Zhejiang ProvinceChina Department of Endodontics The Affiliated Hospital of StomatologySchool of StomatologyZhejiang University School of MedicineKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceHangzhou 310006Zhejiang ProvinceChina

BACKGROUND Several previous studies have reported an unusual root formation in which a fractured apical fragment of an immature root continued to develop independent of the main root after trauma to an immature *** date,there have been only rare reports of the continuing apical formation of the fractured root associated with dens evaginatus(DE).This paper presents a case of a separated root tip formation associated with a fractured tubercle of *** SUMMARY An 11-year-old boy was referred for gingival sinus on the buccal side of the right mandibular second premolar(tooth#45).Clinically,tooth#45 was free of caries,but there was a sign of a fractured tubercle of DE on the occlusal *** showed that the root canal of tooth#45 was widely radiolucent.A separated root apex was found apically under the main root and was nearly completely formed with an apical orifice at the apical ***#45 was diagnosed as tubular fracture of DE with chronic apical periodontitis.A revascularization technique was recommended to treat the *** 3-mo and 1-yr follow-up,the patient remained *** radiography revealed that the separated root tip distally drifted with closure of the ***,the root length and thickness of the main root did not *** Clinicians should be aware that even if tubercle of DE is fractured in an immature tooth,the root tip may be separated from the main root and completely formed.

关键词： Separated root tip Dens evaginatus Tubercle fracture Young permanent tooth Revascularization Case report

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Multivariate synergy for heightening ionic HOF robustness and proton conductivity

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Science China Chemistry 2025年

作者： Xiang-Tian Bai Li-Hui Cao Xu-Yong Chen Jia-Yu Wang zi-Ye zhou Shaanxi Key Laboratory of Chemical Additives for Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and Technology

Multicomponent crystalline materials construct more complex and diversified structures with different combinations and modes,which expands the material structure space and application *** this work,we have successfully synthesized two twocomponent ionic hydrogen-bonded organic frameworks （iHOF-32 and iHOF-33） and a three-component iHOF （iHOF-34）.Guanidine hydrochloride which is rich in N and H and has a short chain length strengthens the hydrogen bonding network of iHOF,thereby aiding in the efficient migration of *** rigid architecture of 1,1'-diamino-4,4'-bipyridine diiodide furnishes additional scaffolding for the iHOFs and enhances its robustness under harsh ***-34 accomplishes the combination of the ultra-high proton conductivity of iHOF-32 and the robustness of iHOF-33 by the synergistic interaction among the three components of *** addition,iHOF-34 was fabricated as a composite membrane with a peak proton conductivity of 1.55×10-1S cm-1,which is 3.8 times higher than that of recast Nafion,and has extensive potential in fuel *** self-assembly strategy of multicomponent HOFs opens up new avenues for constructing diverse structures while promising new opportunities for applications in the fields of proton conduction and energy storage.

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Numerical simulation of multi-scale cavitating flow with special emphasis on the influence of vortex on micro-bubbles

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Journal of Hydrodynamics 2022年第6期34卷 1032-1043页

作者： Ming-zhe zhou zi-yang Wang Xiao-rui Bai huai-yu Cheng Bin Ji State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

A multi-scale Euler-Lagrange method is applied in the current paper to investigate the characteristics of turbulent cloud cavitating flow around a Clark-Y hydrofoil,in which macroscopic cavitating structures are simulated by volume of fluid(VOF)approach,while micro-scale bubbles are modelled based on Rayleigh-Plesset equation and bubble motion *** numerical results are in reasonable agreement with the available experiments,and the transition between multi-scale structures is captured *** evolution of microscopic bubble behaviors is statistically *** one typical cycle,numbers and Sauter mean radius of the bubbles show a similar variation tendency which both sharply spike to their maxima after the breakup of the sheet cavity,and then decrease continuously to their minima before the next *** bubbles are mainly concentrated at the tail of the attached cavity,in front of the cloud cavity and in the region quite close to the hydrofoil suction ***,vortices are extracted to account for the micro-scale *** is found that intense vortices aggravate turbulence fluctuation,thus spalling cavity to generate massive micro ***,the vortices provide microscopic bubbles low pressure and detain them so that numerous bubbles are able to *** effects are remarkable after the breakup of attached sheet cavity,owing to the violent vortices *** the contrary,when sheet cavity develops,the flow field becomes comparatively stable since the strong vortices travel *** micro-scale bubbles are produced,and their volume is generally small.

关键词： Cloud cavitation Euler-Lagrange method bubble-vortex interaction bubble dynamics

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数字经济助推高等教育高质量发展:理论机制与实证检验

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黑龙江高教研究 2025年第2期43卷 44-53页

作者：蔡文伯周子晴石河子大学新疆石河子832000 塔里木大学新疆阿拉尔843300

基于2011—2021年中国31个省份的面板数据,采用双向固定效应模型、面板门槛模型和空间杜宾模型检验数字经济对高等教育高质量发展的影响。研究发现:数字经济对高等教育高质量发展具有正向促进作用,具体看对高等教育要素、能力和功能等... 详细信息

基于2011—2021年中国31个省份的面板数据,采用双向固定效应模型、面板门槛模型和空间杜宾模型检验数字经济对高等教育高质量发展的影响。研究发现:数字经济对高等教育高质量发展具有正向促进作用,具体看对高等教育要素、能力和功能等三个维度的影响依次减弱;数字经济对东部地区高等教育高质量发展有积极影响,对中西部地区无显著影响;数字经济发展水平对高等教育高质量发展具有边际效应递增的非线性影响;数字经济对本地高等教育高质量发展有正向影响,但对邻近地区存在负向空间溢出效应。为此,应强化数字化战略布局,促进高等教育与数字经济产业深度合作;通过打造合作示范区、制定地区发展规划、加大数字基础设施建设投资、开发数字教育资源共享平台等方式发挥东部地区优势,增强数字经济发达地区的辐射带动作用。

关键词：高等教育数字经济高质量发展门槛模型空间计量模型

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Influence of Thermal and Solutal Marangoni Effects on Free Surface Deformation in an Open Rectangular Cavity

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Journal of Thermal Science 2017年第3期26卷 255-262页

作者： zhou Xiaoming huai Xiulan Institute of Engineering Thermophysics Chinese Academy of Sciences

Steady thermo-solutocapillary convection in a rectangular cavity with deformable free surface under microgravity condition is numerically studied, where level set method is employed to capture the free surface deformation. Both the temperature and solute concentration gradients are applied horizontally. The computational results show that, as the thermal to solutal Marangoni number ratio varies between-10 and-1(namely,-10 ≤ R_σ <-1), the flow field exists one anti-clockwise rotating convective cell driven by thermocapillary convection, and the free surface bulges out near the left end wall and bulges in near the right end wall. As-1 < R_σ < 0, the flow field exists one clockwise rotating convective cell driven by solutocapillary convection, and the free surface bulges out near the right end wall and bulges in near the left end wall. As R_σ =-1, the flow field consists of one clockwise and one anti-clockwise rotating convective cells, and the free surface bulges in at the central point and bulges out near the left and right end walls.

关键词： thermo-solutocapillary convection rectangular cavity free surface level set method

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Characterizations of the BMO and Lipschitz Spaces via Commutators on Weak Lebesgue and Morrey Spaces

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Acta Mathematicae Applicatae Sinica 2023年第3期39卷 583-590页

作者： Ding-huai WANG Jiang zhou School of Mathematics and Statistics Anhui Normal UniversityWuhu 241002China College of Mathematics and System Sciences Xinjiang UniversityUrumqi 830046China

We prove that the weak Morrey space W M_(q)^(p) is contained in the Morrey space M_(q1)^(p) for 1 ≤ q1 详细信息

We prove that the weak Morrey space W M_(q)^(p) is contained in the Morrey space M_(q1)^(p) for 1 ≤ q1

关键词： BMO space characterization commutator Lipschitz space Morrey space

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Concentrated Trading and the Survival of Overconfident Traders

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Acta Mathematicae Applicatae Sinica 2019年第4期35卷 753-760页

作者： huai-nian ZHANG De-qing zhou Mathematics School & Institute Jilin University Changchun 130012 China Department of Mathematics and Physics Beijing Institute of Petrochemical Technology Beijing 102617 China School of Finance Central University of Finance and Economics Beijing 100081 China

We build a strategic trading model where the overconfident trader earns more than the rational trader and the mechanism for this result differs from that of Kyle and Wang(1997). In this paper, discretionary and nondiscretionary liquidity traders coexist. The overconfident insider is less worried by the market maker and thus induces a lower liquidity cost. In this way, he attracts all the trading from the discretionary liquidity traders, which enables the survival of the overconfident trader.

关键词： strategic trading concentrated trading overconfidence

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Three-dimensional numerical simulation and earth pressure analysis on double-row piles with consideration of spatial effects

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第10期12卷 758-770页

作者： zi-han WANG Jian zhou Department of Geotechnical Engineering Tongji University Shanghai 200092 China

As a new kind of technology in retaining structures, the characteristics of double-row piles are significantly affected by spatial effects. In this paper, double-row piles as a retaining structure are simulated numerically in three-dimension by finite element software PLAXIS 3D FOUNDATION. The behavior differences of piles in different positions around the foundation pit are analyzed. By changing the parameters, including the length-width ratio, the excavation depth, the distance between rows and the diameter of piles, the variations of the lateral deformation, the bending moment and the earth pressure around the piles are determined. The reasonable values of parameters and some suggestions with consideration of earth pressure are proposed for the design of double-row piles as a retaining structure. The results show that the lateral deformation and bending moment are the largest in the middle of long side of the foundation pit, which is identified as the most unfavorable position. It is indicated that the earth pressure between rows above pit bottom is close to active earth pressure, while the earth pressure between rows under pit bottom is close to static earth pressure. It is suggested that 1/2-2/3 of pile length, 0.6-1.2 m, 3d-6d, and 2d-2.5d be chosen as embedded depth of piles, diameter of piles, distance between rows, and distance between piles, respectively, where d is the pile diameter.

关键词： Double-row piles Retaining structure Spatial effect Finite element Earth pressure

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Some notes on numerical simulation of the turbulent cavitating flow with a dynamic cubic nonlinear sub-grid scale model in OpenFOAM

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Journal of Hydrodynamics 2020年第4期32卷 790-794页

作者： zi-yang Wang Xian-bei Huang huai-yu Cheng Bin Ji State Key Laboratory of Water Resources and Hydropower Engineering Science School of Power and Mechanical EngineeringWuhan UniversityWuhan 430072China College of Electrical Energy and Power EngineeringYangzhou UniversityYangzhou 225127China

The accuracy of large eddy simulation(LES)is highly dependent on the performance of sub-grid scale(SGS)*** the present paper,a dynamic cubic nonlinear sub-grid scale model(DCNM)proposed by Huang et *** implemented for the simulation of unsteady cavitating flow around a 3-D Clark-Y hydrofoil in *** performance in predicting the evolution of cloud cavitation is discussed in *** simulation with a linear model,the dynamic Smagorinsky model(DSM),is also conducted as a *** results with DCNM show a better agreement with the available experimental *** comparison between DCNM and DSM further suggests that the DCNM is able to predict the backscatter more precisely,which is an important feature in *** characteristics of DCNM is analyzed to account for its advantages in the prediction of unsteady cloud cavitation as *** results reveal that it is the nonlinear terms of DCNM that makes DCNM capture sub-grid scale vortices better and more suitable for studying the transient behaviors of cloud cavitation than DSM.

关键词： Cavitation large eddy simulation(LES) nonlinear sub-grid scale model OpenFOAM

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Screening-Assisted Dynamic Multiple Testing with False Discovery Rate Control

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Journal of Systems Science & Complexity 2023年第2期36卷 716-754页

作者： MUSHTAQ Iram zhou Qin zi Xuemin School of Statistics and Data Science LPMC and KLMDASRNankai UniversityTianjin 300071China School of Mathematics and Statistics Jiangsu Normal UniversityXuzhou 221116China School of Science Tianjin University of Technology and EducationTianjin 300350China

In the era of big data,high-dimensional data always arrive in streams,making timely and accurate decision *** has become particularly important to rapidly and sequentially identify individuals whose behavior deviates from the *** at identifying as many irregular behavioral patterns as possible,the authors develop a large-scale dynamic testing system in the framework of false discovery rate(FDR)*** fully exploiting the sequential feature of datastreams,the authors propose a screening-assisted procedure that filters streams and then only tests streams that pass the filter at each time point.A data-driven optimal screening threshold is derived,giving the new method an edge over existing *** some mild conditions on the dependence structure of datastreams,the FDR is shown to be strongly controlled and the suggested approach for determining screening thresholds is asymptotically *** studies show that the proposed method is both accurate and powerful,and a real-data example is used for illustrative purpose.

关键词： Change-point false discovery rate high-dimensional datastreams large-scale inference sequential analysis weak dependence structure

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