Experimental Study of Effect of Medium Boundary on Light Distribution in Tissue Phantoms

An experimental method for investigating the effect of medium boundary on distributions of light in the biological tissue phantom intralipid is presented. Measurements of distributions of light in intralipid-10% suspensions at 633 nm are described, in which a narrow collimated beam is incident on the surface of the phantoms and into the different depths inside of the phantoms. The experimental results show that the effect of the boundary of the medium on the curves geometry of light distributions is trivial, but the effect on intensity of scattering light is obvious, the maximal relative change of the energy fluence reaches 53.8% and the position of the peak of the energy fluence curve has a shift of 1.1 mm in the reverse direction of incident light for the phantom with albedo a=0.998, and the effect of the boundary is decreased with the increase of the absorption coefficients of tissue phantoms. The experimental results were analysed by the diffusion theory. These studies will be helpful for further understandings of the relation between the boundary of biological tissue and the distribution of light in tissue.     

《体育与健康》课程改革中的实验研究

新课程倡导一种课程共建文化,需要教师重新认识和确立自己的角色,重视教师和学生的课程参与,在教学目标上贯彻"健康第一"的指导思想,以身体、心理、社会三维健康观为目标,发展学生探究式学习,培养学生的观察能力、创造能力和独立思考能力。我们教师应当创设民主的教学环境,建立课堂集体研究策略和评价机制,使师生之间、同学之间有一种畅所欲言的、生动活泼的教学气氛。挖掘学生潜能,培养学生运动参与和发现的能力,不再埋怨学生的纪律不好,用兴趣激发代替纪律约束,常常会受到事半功倍的效果,学生才会乐此不疲、乐歌而至。     

数字

30皮瓦美国密歇根大学宣布,该校研究人员开发出一种超级节能微型芯片,在正常工作模式下耗电量是普通芯片的十分之一,在"睡眠模式"下用电量则低至三万分之一。这一名为"凤凰处理器"的芯片创造了低耗电量的新纪录。在"睡眠模式"下,它的能耗仅为30皮瓦(1皮瓦为     

地震资料预测孔隙度的方法与分析

本文介绍用地震资料预测孔隙度的几种方法,以及国内外预测孔隙度的现状,并指出部分地震资料预测孔隙度存在的问题,也指出今后该方法预测隙度的研究方向,同时提出个人对今后预测方法的看法。     

斑叶稠李育苗技术研究

斑叶稠李（Padusmaackii）又称山桃稠李，落叶小乔木，高4至10米。树皮光滑，铜红色，似西北山桃。总状花序多花密集，核果球形，紫褐色。分布在黑龙江、辽宁、吉林阳坡疏林中，耐低温，是北方地区具有较高观赏价值的园林绿化树种。     

Comparison of Drought-Resistance about Three Wild Rocky-Grasses

In this experiment, using the methods of drought-stress in the pot and PEG simulative drought-stress, three native rocky-slope grasses Pogonatherum panideum（Lam.） Hack, Erioophorum comosum nees and Cynodon dactylon cultivated in the pots were selected as materials to study their drought-resistance by analyzing the indexes such as the leaf area index, the drying roots accumulation, the holding water ability of leaf, the relative conductance of leaf, the soluble protein, chlorophyll. At the same time, by comparing with membership function value of each index, the order of each grass drought-resistance was decided. The results showed that the drought-resistance of Erioophorum comosum nees was stronger than Cynodon dactylon and drought-resistance of Cynodon dactylon was stronger than Pogonatherum panideum （Lam.） Hack. The purpose of the experimental results was to find theoretical foundations for selecting and cultivating native protecting-slope vegetations to adapt to rocky slopes.     

语言模因论视角下的不可译现象研究

模因视角下对待不可译有两种处理办法：一是产生“基因型模因”，基本上采用直译或异化策略再进行补偿的办法，保证信息不失真，实现“相同信息异型传播”；二是产生“表现型模因”，在原模因的基础上产生较大的变异，采用意译或归化的翻译策略，实现“不同信息同型传播”。     

铁铝催化体系催化丙烯酸丁酯聚合

研究了Fe(acac)3-Al(i-Bu)3-8-羟基喹啉(acac=乙酰丙酮)催化体系催化丙烯酸丁酯(BA)聚合，考察了聚合规律，用凝胶渗透色谱研究了聚合物分子量和分子量分布．动力学研究表明聚合反应对单体浓度呈一级关系，表观活化能为13．9kJ／mol．     

在线考试系统的设计

针对传统考试方式存在的诸多不足,研究开发了一种基于MySQL数据库的在线考试系统.     

一种基于段的基音检测算法

作为语音信号处理领域一项基本、关键的技术,基音检测在语音信号处理中扮演着重要的角色,一直是语音信号处理的一个研究热点.首先对传统的基于短时自相关函数法的基音检测进行了研究;在此基础上提出了一种能同时检测一段语音信号基音周期的方法,有效地克服了传统基音检测算法只能检测一帧语音信号基音的缺点.进行了实验仿真,结果表明通过去野点,中值平滑等后处理的基于段的基音检测算法比传统的基于帧的基音检测算法具有更好的抗噪性.