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5月22日学术讲座预告
( 发布日期:2018/5/15 阅读:次)

报告题目:Computer simulation of food comminution: efficiently theory testing and designing experiments

  讲   Hilbert Willem van der Glas  英国邓迪大学  研究员

报告时间:2018年5月22日(周二)上午10:00

报告地点:下沙校区食品学院257报告厅

 

报告人简介

        Hilbert Willem van der Glas博士,英国邓迪大学研究员,英国葛兰素史克公司顾问,从事义齿佩戴者的咀嚼效率研究。曾任新西兰梅西大学工程和高级技术学院客座教授,英国邓迪大学口腔学院荣誉高级研究员,荷兰乌得勒支大学医学中心口腔颌面外科、义齿修复及特殊牙科护理系研究助理、协调研究员和副教授等。主要在动物的行为及神经心理学以及口腔科学上建树颇丰。

报告摘要

       Food comminution can be evaluated by determining the median particle size, X50, and the broadness, b, of the size distribution following various numbers of chewing cycles N. Two basic processes are involved: (1) selection, i.e. every particle has a chance of being placed between the teeth and being subjected to (2) breakage. Breakage is related to degree of fragmentation.

The selection chance S(X) increases with particle size, X, according to S(X)=vXw (S(X)1), in which v reflects the general level of selection and w the ratio in selection chance  between two particle sizes. Breakage can be described by an function using a fragmentation factor r: B(Y,X)=1-(1+r.Y/X)(1-Y/X)r

       Using selection and breakage functions, the overall process of food comminution, including the relationship between X50 and N has been analytically solved (Baragar et al., J Theor Biol 1996 ; 181: 169-78), however, under the assumptions that: (1) v and w in the selection function would be constant with N, and (2) that r would also be constant with N and would be constant regardless of  the particle size X  (the nill-conditions’ of comminution). Experiments with colour and form-labeled particles have shown that none of these assumptions are quite true (van der Glas et al., J Dent Res 1987 ; 66: 1547-50).

      The effects of various types of deviations from nill-conditons’ on X50-N and b-N relationships can most easily be assessed by using a computer simulation model of chewing. The seminar will show how to build such a model in a spreadsheet of Excel®, will show some of its results, and consider its future potential.

        欢迎广大师生参加!

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