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Diet reduces the effect of exogenous grit on tooth microwear

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Biosurface and Biotribology 2020年第2期6卷 48-52页

作者： licheng hua Jianbin Chen Peter SUngar School of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211ZhejiangPeople’s Republic of China Department of Anthropology University of ArkansasFayettevilleAR 72701USA

Exogenous grit adherent to the surface of food items and food fracture properties have each been considered important factors contributing to pattern and degree of tooth wear in ***,the interactions between these two factors in generating distinctive microwear textures have remained *** the authors revisit in-vitro results from simulated chewing to explore how adherent grit and physical properties of foods act together to create dental microwear textures on occlusal enamel *** suggest that the effect of exogenous grit on microwear texture is dependent on the material properties foods to which they *** in the absence of food causes more complex microwear surface textures than foods covered with similar levels and types of grit(for a given number of chews and angle of approach between opposing teeth).Different foods covered in grit also yield different complexity ***-laden,pliant meat,for example,results in a less complex texture than does resistant,grit-laden raw *** work implied that tooth wear assessment can benefit from considering grit load and food material properties together.

关键词： wear effect generating

Digital analysis of tooth microwear,a potential application for dental microwear monitor

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Biosurface and Biotribology 2022年第1期8卷 52-57页

作者： Gang Xue Conghu Hu Jianke Du licheng hua Key Laboratory of Impact and Safety Engineering Ministry of EducationSchool of Mechanical Engineering and MechanicsNingbo UniversityNingboChina Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education Nanjing University of Aeronautics and AstronauticsNanjingChina

In general,tooth wear is difficult to be noticed until it leads to toothache in *** a dynamic dental wear monitoring system to predict tooth wear in daily life is a *** translation between complex surface wear morphology and corresponding digital signal source is a technical limitation to develop this kind of monitoring *** texture analysis has been widely employed in predicting diet by a *** main question is whether the microwear texture analysis has potential development space to develop a sensor for monitoring tooth *** to obtained results,the microwear texture analysis had enough sensitivity to display the surface morphology variations for different chewing foods and various *** corresponding sensitive digital signal of tooth microwear surface morphology makes it possible to develop a dental microwear sensor.

关键词： corresponding signal dental sensor surface morphology tooth microwear

Flexible,high-strength titanium nanowire for scaffold biomimetic periodontal membrane

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Biosurface and Biotribology 2021年第1期7卷 23-29页

作者： Jin Li licheng hua Weiyuan Wang Chenjie Gu Jianke Du Conghu Hu School of mechanical Engineering and Mechanics Key Laboratory of Impact and Safety EngineeringMinistry of EducationNingbo UniversityZhejiang NingboChina Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education Nanjing University of Aeronautics and AstronauticsNanjingChina State Key Laboratory of Tribology Tsinghua UniversityBeijingChina Department of stomatology Zhejiang University School of MedicineAffiliated Hangzhou First People's HospitalZhejiang HangzhouChina Department of Microelectronics and Engineering Ningbo UniversityZhejiang NingboChina

A layer of micro-sized periodontal membrane can buffer most chewing forces to protect the interface between the natural tooth root and alveolar *** dental implants usually direct contact onto the alveolar bone without a buffer layer,which increases the risk of surface *** main purpose of this work was the bionic design of a flexible layer of nanowire scaffold on a titanium implant surface according to the function of the periodontal *** of nanowires were woven into a superhydrophilic layer of porous *** evolution of mechanical properties displayed that the biomimetic nanowire scaffold could absorb a maximum of about 1.59 KJ energy per square centi-meter by low-speed *** minimum tensile strength of one nanowire was 2 GPa.A biomimetic flexible periodontal membrane connection functioning between the natural tooth root and alveolar bone has great potential value for developing advanced artificial dental implants for dental restorations.

关键词： titanium strength sized

Studies on Functionally Substituted n5-Cyclopentadienyl Transition-Metal Compounds --Synthesis and Crystal Structure of η5-CH3COC5H4W(CO)3CH2C5H5

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Chemical Research in Chinese Universities 1990年第1期6卷 14-19页

作者： Song licheng , Yang hua and Hu Qingmei (Department of Chemistry, Nankai University, Tianjin)Zhou Zhongyuan (Chengdu Center of Analysis and. Determination, Academia Sinica, Chengdo)

Reaction of benzyl chloride with η5-CH3COC5H4W(CO)2Na formed in situ from η6-CH3CO C6H4Na and W(CO)2 gives η6-CH3COC6H4W(CO)*** single crystal structure of the product was determined by X-ray diffraction method. It crystallizes in the triclinlc space group P1 with unit cell parameters a= 10.199(5),b=12.116(7), c=14.207(6)A;a=69.47(5),β=72. 38(3),γ= 85.89(4);V= 1569. 9A3, Dc= 1.98 g/cm2; Z=4. Least-square refinement led to final R value of 0. 0539 and Rw value of 0. 0553, based on 3548 independent observed reflections.

关键词： η5-Acetylcyclopentadienyl 6-Benzyl tungsten compounds Synthesis Crystal structure

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牙齿微痕研究在古食性重建中应用的简述

人类学学报 2021年第2期40卷 292-306页

作者：华李成 Peter S UNGAR 浙江宁波大学机械工程与力学学院宁波315211 Department of Anthropology University of ArkansasFayettevilleAR 72701USA

在古食性研究中,牙齿微痕是指动物在咀嚼食物的过程中在牙齿咬合面上产生的微观磨损痕迹。不同食性的动物具有不同的牙齿微痕特征,因此可以通过研究牙齿微痕特征来重建灭绝动物的古食性,为探讨动物演化和古生态环境变化提供重要信息。... 详细信息

在古食性研究中,牙齿微痕是指动物在咀嚼食物的过程中在牙齿咬合面上产生的微观磨损痕迹。不同食性的动物具有不同的牙齿微痕特征,因此可以通过研究牙齿微痕特征来重建灭绝动物的古食性,为探讨动物演化和古生态环境变化提供重要信息。本文主要介绍牙齿微痕作为一种简单而高效的古食性重建方法在古生物领域中的应用。本文主要内容包括牙齿微痕的发展历史,形成机理与应用,以及近年来被广泛应用的牙齿微痕定量化分析——表面纹理分析法,并在最后浅谈了牙齿微痕研究未来可能研究的方向。

关键词：牙齿微痕表面纹理饮食结构分析方法

On the Pathwise Uniqueness of Solutions of One-dimensional Reflected Stochastic Differential Equations with Jumps

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 149-163页

作者： hua Zhang School of Statistics and Data Science&Key Laboratory of Data Science in Finance and Economics Jiangxi University of Finance and EconomicsNanchang330013China

In this paper, we are concerned with the problem of the pathwise uniqueness of one-dimensional reflected stochastic differential equations with jumps under the assumption of non-Lipschitz continuous coefficients whose... 详细信息

关键词： reflected diffusion processes with jumps pathwise uniqueness local time Meyer It?'s formula

在法律人工智能时代,法学院本科生需要怎样的教育——宏观框架与微观方案

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法学教育研究 2021年第2期33卷 90-116页

作者：华立成北京大学法学院美国西北大学法学院

目前的法学教育面对人工智能的到来缺乏充分的应对,这与法律人工智能技术发展、学术研究、实务应用上出现的问题相吻合。因此,法学教育——尤其是本科教育——有能力也有必要更充分地应对因人工智能的产生而带来的改变。如果自下而上的... 详细信息

目前的法学教育面对人工智能的到来缺乏充分的应对,这与法律人工智能技术发展、学术研究、实务应用上出现的问题相吻合。因此,法学教育——尤其是本科教育——有能力也有必要更充分地应对因人工智能的产生而带来的改变。如果自下而上的变革只会循序渐进地走入现实,本文提出如下两个长期建议:(1)从变革提议者的角度出发,本文基于“法官能力”这一相对宽泛的培养目标,指出目前在“人工智能时代的法学院应侧重培养何种能力”这一具体问题上存在一定的分歧,并提出一个变革框架;这一框架虽然抽象,但其抽象性与变革提出者和一线教员在教学工作中的分工十分吻合。(2)从一线教学的角度出发,本文在这一框架下作出了自己的回答:当下中国和美国案例教学法存在一些问题,而将真实案例涉及的各类材料(包括真实案件背景、非法律的文献)作为法学基础课的辅助手段和法学方法课的具体延伸是一种较为贴合时代的教学方法变革。

关键词：法学本科教育法律人工智能案例教学 “法官能力” 恶意串通民法教学

Goal-Oriented Control Systems(GOCS):From HOW to WHAT

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 816-819页

作者： Wen-hua Chen the Department of Aeronautical and Automotive Engineering Loughborough UniversityLeicestershireLE113TUU.K.

Brief:New control theory is required to underpin safe design and deployment of future highly automated systems to deal with uncertain environments and complicated tasks,enabled by AI and other advanced ***-Oriented Control Systems offer potential to transform the control system design from currently instructing a control system how to perform a task to specifying what is to be achieved.

关键词： automated instru system

Reliability of a Multicomponent Stress-strength Model Based on a Bivariate Kumaraswamy Distribution with Censored Data

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 478-507页

作者： Cong-hua CHENG School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061China

In this paper,we consider a system which has k statistically independent and identically distributed strength components and each component is constructed by a pair of statistically dependent elements with doubly type-II censored *** elements(X1,Y1),(X2,Y2),…,(Xk,Yk)follow a bivariate Kumaraswamy distribution and each element is exposed to a common random stress T which follows a Kumaraswamy *** system is regarded as operating only if at least s out of k(1≤s≤k)strength variables exceed the random *** multicomponent reliability of the system is given by Rs,k=P(at least s of the(Z1,…,Zk)exceed T)where Zi=min(Xi,Yi),i=1,…,*** Bayes estimates of Rs,k have been developed by using the Markov Chain Monte Carlo methods due to the lack of explicit *** uniformly minimum variance unbiased and exact Bayes estimates of Rs,k are obtained analytically when the common second shape parameter is *** asymptotic confidence interval and the highest probability density credible interval are constructed for Rs,*** reliability estimators are compared by using the estimated risks through Monte Carlo simulations.

关键词： stress-strength model bivariate Kumaraswamy distribution multicomponent reliability doubly Type-II censored scheme interval estimation