大脑健身操

取球有个人在打网球时,不小心把球打进了地面的洞穴里,这个洞形状古怪,向里弯曲,口径狭窄,直径大约20公分左右,人无法爬进去。而且,土质是坚硬的粘土,不能轻易挖开。在不损坏网球的情况下,如何将球取出呢?     

澳大利亚为什么要进口屎壳郎

滚粪球的屎壳郎为何远渡重洋,出国到澳大利亚去?原来,屎壳郎是一种爱吃粪的昆虫。每到夏秋两季,一对屎壳郎夫妇找到人或牲畜的粪,就把粪弄成圆球,在地上推着滚,使球粘土,越滚越大。然后将粪球推到一个合适的地方,在粪球下面挖土,使粪球逐     

粘土结构和粘土-水系统辩证解析及其教学实施

对粘土结构和粘土-水系统性能进行了辩证解析。基于电荷平衡的性质,结合库仑定律,从科学角度和辩证角度对粘土荷电性质进行了分析。在此基础上对粘土结构和粘土-水系统相关性质,即粘性、可塑性、悬浮性的辩证内涵进行了分析。对课程教学中引导学生进行辩证思维以帮助学生提高学习效率的教学方法进行了探索。     

小学超轻粘土校本课程的开发及教学

超轻粘土是一种起源于日本的无毒、新型环保、自然风干的手工造型材料,其特性非常适合小学生的年龄特点。从2011年开始我校持续开展了超轻粘土校园特色的课程与活动,在明确了粘土课程的目的和任务的基础上,通过在美术教材中渗透超轻粘土教学;结合少年儿童喜爱的卡通、动画,塑造活泼现代的粘土形象;传承中华文明,塑造内涵丰富的粘土形象等几方面的教学尝试,让小学生们喜欢上粘土课程,丰富他们的塑造能力、想像力、创造力。     

筋带-砂-粘土层状体系直剪试验研究

为了研究粘土与加筋材料接触面之间的力学特性,及砂对粘土与筋带接触面力学特性的改善情况,采用直剪试验方法对粘土与聚丙烯土工带polypropylene在粘土不同含水量条件下进行了不同法向荷载作用的直剪试验,讨论了法向应力、含水量对高液限粘土与筋带之间剪切特性的影响;设计了筋带砂粘土层状布置体系的加筋土结构模型,并根据设计的模型进行直剪试验.试验结果表明:粘土与筋带接触面之间的剪切强度随着法向应力的增加呈非线性增长;接触面的摩擦系数随着含水量的增加而减小,接触面的粘聚力随含水量的增加先增大后减小,粘土与接触面之间存在一个最佳的含水量,这个值要比粘土压实的最佳含水量低2%左右;筋带砂粘土层状布置体系表明砂对粘土与筋带的剪切特性起到明显的改善作用.     

对贵州红粘土的剖面特征分析及成因的探讨

红粘土作为特殊土中的一种,其特殊性质是由成分和结构控制,且成分和结构取决于红粘土的成因。为了探讨红粘土的成因从而深入了解其特殊性,该文结合试验对贵州岩溶地区8个红粘土剖面48个样品的常量元素和微量元素作出分析和对比,对红粘土剖面粘土矿物特征作出分析。验证了红粘土主要是在溶蚀－交代作用和红土化作用两个阶段形成,并且与母岩成分、CO2含量、气候条件、地形地貌等有关。     

套井回填粘土防渗墙截渗效果分析

文章简要叙述了套井回填粘土防渗墙的基本内容,结合工程实例,通过渗流计算,重点分析了采用套井回填粘土防渗墙前、后的大坝渗流情况,证实了套井回填粘土防渗墙具有良好的截渗效果。     

蛋糕时间到

小朋友,看了安奇奇做的美食是不是很心动呢？咱们也动动手,做一款属于自己的“美味蛋糕”吧! 材料：贝蒙超轻粘土,粘土工具棒等 制作方法： ①把白色粘土搓圆压扁,做成三角形的蛋糕块。     

尼龙6、尼龙66/粘土纳米复合材料的制备和性能

文章综合近年来国内外关于尼龙/粘土纳米复合材料的文献,详细论述了尼龙/粘土纳米复合材料的制备方法和性能。     

浅析轻粘土在幼儿手工活动中的巧妙运用

轻粘土手工制作不仅仅可以充分锻炼幼儿手部灵活性,强化手部精细动作发展,还可以发展幼儿想象力、创造力,促进大脑发展。如今,越来越多的家长开始关注幼儿创造能力的培养,轻粘土作为一种新型操作材料,在市面上广为流传,与传统材料相比,轻粘土的环保、便于塑性、色彩鲜艳等特点使它具备了很大优势,它在老师的带领下逐渐走进课堂,受到大家的关注。通过实践尝试,我对轻粘土有了深刻的了解,在轻粘土的选择、使用技巧、后期作品处理、展示、对孩子们能力的影响有了新的认识。     

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.     

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

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.