“模拟眼球成像”简易模型的制作

“模拟眼球成像”的实验,一般使用“双凸透镜成像装置”直观地揭示眼球成像原理与特点,但在探究晶状体的调节功能及近视形成与矫正的模拟实验中,由于频繁的位置移动与透镜的反复转换,学生要把模型演示的现象联想迁移到眼球成像有一定的难度。本制作是选用空的纸牛奶盒模拟“封闭的眼球”,内壁视为视网膜。利用此简易模型可以进行眼球成像的系列探究活动,如演示眼球成像原理,探究晶状体的调节功能,探究近视形成与近视眼矫正方法等。学生借助此模型的演示,更易将演示的现象迁移到认识真实眼球的成像规律。     

自动变速器综合实验台故障设置装置的研制

01M电控自动变速器实验台具备演示挡位转换、模拟故障诊断与排除等功能,配备的按钮式故障设置装置是一种操作简便、性能可靠的控制装置。它可以很方便地演示自动变速器的常见故障检测及排除,实现该实验台综合性能,显著提高教学效果。     

变焦距透镜模型的制作

笔者为较好地说明眼球变焦原理,设计制造出一种简易的变焦透镜。此透镜采用控制水位高低来控制透镜的凹凸程度。具有制作简单、操作简便、变焦情况一目了然、成像清晰的特点。可在统一光具座上演示,便于推广。用梨形灯泡模拟视网膜成像,更加直观地反映人眼成像规律。这种变焦透镜除可用于眼球模型演示外,还可用于凸透镜、凹透镜成像和会聚、发散作用等演示,实现一物多用。全套演示装置如图1所示。     

分子力与分子间距离关系的模拟演示

本介绍了用表面张力与水膜高度来模拟演示分子力与分子间距离关系的方法，阐述了演示原理，描述了演示过程，并给出简单演示装置图．     

虚实一体的原子力显微镜实验系统

研究开发了虚实一体的原子力显微镜实验系统,由AFM原理演示及模拟扫描软件系统、AFM模拟演示探头系统和AFM实验仪器装置等部分组成。开展了AFM实验背景的介绍、相关原理的仿真演示、AFM操作的模拟训练、AFM模拟扫描成像实验数据的测量及相关的实验研究。实现了对学生进行创新思维、操作技能、知识整合等各种层次的训练,并建立了"回顾历史、触摸现在、遇见未来"的四维空间物理实验教学模式,具有低成本、多功能和高效率等特点。该虚实一体的AFM实验系统已在我校得到很好的推广与应用。     

多路传感信号演示实验系统研制

设计开发一套多路传感信号演示实验系统.该系统主要由多种传感器及信号采集装置、多路信号转换装置、PC机实时显示界面3部分组成.传感器及信号采集装置包括:由霍尔传感器采集信号的弹簧振子演示装置、压力传感器演示装置,超声波安防测距演示装置等.多路信号转换装置采用单片机控制各通道的选通,系统实现了多通道信号的方便切换,便于在大屏幕投影设备实时显示多种演示效果,充分利用了单机通信有限的接口资源.PC机界面采用VB6.0软件编写,系统操作方便,界面美观.     

自制两则生物模拟演示装置

"视觉和听觉的形成"是初中生物教学中的难点,学生理解起来有困难。为此,笔者自制了"视觉的形成"模拟演示装置和"听觉的形成"模拟演示装置,并将上述两款演示装置应用于教学之中,取得了较好的效果。一、"视觉的形成"模拟演示装置1.材料与用具。凸透镜(如晶状体)、镜筒(如眼球的前后径)、有线摄像头(如视网膜、视神经)、"笔记本电脑"(如人的大脑,而屏幕相当于视觉中枢)、     

汽油机电控系统原理实物演示装置开发

采用量产电控汽油机上的传感器、控制器和执行器，开发了一套用于演示汽油机电控系统工作原理和过程的实验教学装置。该装置可模拟并演示电控汽油机的喷油、点火、加速、减速、怠速、碳罐等控制过程，简洁、直观、可操作性强，对学生掌握汽油机电控系统的组成和功能起到了积极作用。     

计算机对生物实验的模拟演示和数据处理

计算机对生物实验的模拟演示和数据处理陈远扬一、生物实验模拟和演示计算机模拟生物实验教学,可充分发挥ＣＡＩ个别化教学的优点。在实验之前,学生对实验的认识来自教科书。使用计算机模拟演示实验,可有针对性地进行实验前的辅导,让学生熟悉实验装置、操作步骤和实验...     

眼球成像及近远视成因和矫正实验的创新

分析教科书中眼球成像教学中存在的问题,通过实践创新,创造性地制作出了一个全新的近视远视成因及矫正演示仪,详细阐述了装置的材料、制作过程、演示过程、使用注意事项及创新优点,用此装置的演示帮助学生理解,促进深度学习,提高核心素养。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.