共查询到20条相似文献，搜索用时 500 毫秒
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高中化学第一册(人民教育出版社必修)第七章《碳族元素无机非金属材料》的一个重点是硅和二氧化硅，教材没有安排一个实验．学生感觉平淡，容易遗忘。怎样发挥化学的特点，把实验引进来呢?笔者翻阅了许多资料．发现有关实验存在反应剧烈，不够安全等问题经过实验摸索，在符合可操作性、安全性、趣味性和美观性的原则下，笔者设计了以下实验。 相似文献
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徐小玉 《常州轻工职业技术学院学报》2006,(3)
薄膜制备过程中溅射靶材的利用率很低,导致薄膜材料制备成本很高。以自制的高纯度纳米晶镍锌钴/二氧化硅复合铁氧体粉体为原料,冷等静压后高温烧结制备得到铁氧体复合靶材。用XRD、EPMA和SEM分析靶材的化学成分和微观形貌。结果表明:靶材为镍锌钴铁氧体和二氧化硅的复合材料,收缩率达14.37%,能在高真空多功能磁控溅射仪正常工作,并成功制备得到性能良好的软磁薄膜。整个制备过程工艺简单,操作方便可行,大大降低了靶材的制备成本。 相似文献
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制备了PEO LiClO4 Al2O3及PEO LiClO4 碳酸乙烯酯 (EC)两种聚环氧乙烷(PEO)复合聚合物电解质 (SPE)薄膜,用不锈钢及铂两种惰性电极研究了聚合物电解质的交流阻抗特性,并对SPE/惰性电极的界面特性进行了研究.提出了一种具有普适性的等效电路,发现电导率的测定与采用的惰性电极有关.而且交流阻抗谱图与所加交流扰动幅度无关,但与直流极化电势有关.EC含量的增加对低频直线的斜率也有影响. 相似文献
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高反应活性的五配位硅钾化合物与2-氯乙醇反应制备双羟基四配位硅化合物及动力学行为，如温度、不同反应物摩尔比、催化剂等因数对该反应平衡常数和速率常数有影响，并选择出该反应的最佳合成条件。 相似文献
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硅的重要化合物——硅酸是高中化学新课标关于常见无机物及其应用中要求通过实验了解的基本内容之一[1]。现行普通高中教科书《化学1·必修》(人教版)在介绍硅酸的有关知识时,所安排的实验是[2]:在试管中加入3～5mL Na2SiO3溶液(饱和Na2SiO3溶液按1:2或1:3的体积比用水稀释),滴入1～2滴酚酞溶液,再用胶头滴管逐滴加入稀盐酸,边加边振荡,至溶液红色变浅并接近消失时停止。 相似文献
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用镍盐制备纳米级镍粉 总被引：1，自引：0，他引：1
用7水硫酸镍与还原剂次亚磷酸钠反应,制备纳米级镍粉。用40mlC(Niso_4)=1.145mol/l的溶液(此时用氨水调PH=5.0)与30ML(N_aH_2Po_2)=1.1mol/l的溶淮反应。反应过程中温度控制在60-70℃,次亚磷钠溶液加入的速度为:100ml/min,搅拌强度150r/min。制备出纳米级镍粉收率在95％左右。XRD检测结果表明产物为单质镍;TEM检查结果表明纳米级镍粉的粒径为10-70nm。 相似文献
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李亚贞 《重庆电子工程职业学院学报》2012,(2):163-167
以玉米淀粉、钛酸正丁酯和γ-氨丙基三乙氧基硅烷为原料,通过化学键合法制备出玉米淀粉-Ti-Si复合材料,通过FTIR、SEM等方法对其进行了表征,考察了其对水溶液中Hg2+、Cu2+、Pb2+及Cd2+等重金属离子的吸附性能。研究结果表明,钛、硅无机氧化物与淀粉发生了键合作用,并均匀分布在淀粉中;淀粉-Ti-Si复合材料对金属离子具有较好的吸附性能,与淀粉及淀粉-Ti复合材料相比,淀粉-Ti-Si复合材料的吸附性能得到了明显改善。 相似文献
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Since the late 1960s,culture has been considered tighter with communication.Culture IS based on the community of communication.Communication involves people and their environment.Thus culture is an important factor in communication.Today with modem economic and technological development,intercultural communication is mole important than ever before. When people from different cultural background communicate with each other,their social stereotype pattern of behavior, their habits of language and thought differ from one another,because these are the possible factors that affect intercultural communications.Culture norms also change,culture may be transferred as signs but we have to study and understand the above carefially. 相似文献
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The article introduces Shakespeare's tragedy "Hamlet".Hamlet wants to revenge for his father.But when the opportunity is coming,he delays his revenge.The passage analyzes the causes of his delay from Hamlet's characters. 相似文献
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The thesis mainly discusses the character of the heroine in Charlotte Brontes famous novel "Jane Eyre". There are three major parts-introduction,analysis which is the main body of the thesis,and conclusion.Jane Eyre,the heroine,is a new woman image who requires independence equality and freedom.The thesis just analyzes Janes these rebellious characters through four peroods of her experiences.First,in her childhood,she has shown her rebellious spirit.As an orphan,Jane suffers a lot of misery.Not only her aunt treats her cruelly,her cousins despise her,but also do servants have a prejudice against her.In Janes immature heart, she is unwilling to bear ill treatment.She rebels them bravely.Second,when she studies at Lowood,her rebellious spirit is exposed furtherly.Her view doest stay in Mrs Reeds,instead turns to the whole society.She makes hypocrisy of so-called charity to be discovered completely.At the same time,she declares her independent,equal rebellious thought to her friend-Helldn who endures oppression willingly.Third,she,as a governess in Thornfield Hall falls in love with Rochester-her master.During this period,her thought grows into maturity.Thought she loves him passionately,she never loses her dignity and independence for him.When she knows his mad wife still lives,she makes up her mind to leave him.For she doesnt want to become his mistress.Fourth,her refusal of St Johns proposal of marriage depicts Janes character.She knows John does not love her at all and his purpose of marriage is only to perform his great task missionary.Jane does want to become a sacrifice.She breaks traditional morality,then she goes back to Rochester. 相似文献
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程立新 《承德职业学院学报》2004,9(2)
The context of a word consists of the other words surrounding it and the situation in which it is used.When we come across a new word in our reading,instead of looking it up in a dictionary for its definition,we can guess its meaning from its context. 相似文献
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痛定思痛：当代中国武术发展之缺失——刍议武术所缺乏宽容态度、自省精神、固守品质、稳定情感、真正说教与现代反思 总被引：1，自引：0，他引：1
当代中国武术经历了时代的沧桑和变迁,在历经了文化和历史的发展与洗礼之后,依然发展、繁衍至今。在这样一个漫长的过程中,伴随着以社会环境和社会人群价值取向为主的变迁与变化,当代中国武术的发展与当代社会的发展正逐渐的呈现出某些相背离和不和谐的表象。通过研究,我们发觉中国武术中原本一些内在的东西正在不断的被遗忘,正在不断的流逝。本文试从中国武术在当代发展中的问题境域入手,解读中国武术在当今世界和社会中存在的一些问题,希望能够从中找到中国武术发展的＂合法性＂或＂合时性＂的内在依据,以挺立中国武术的脊梁。 相似文献
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孔敏 《承德职业学院学报》2005,10(2):58-61
Introduction Whatisculture?Toputitsimply,culturemeansthe totalwayoflifeofaperson.Thissimpledefinitionimplies thatculturereferstothepattersofcustoms,traditions,socialhabits,values,beliefsandlanguageofasociety.As cultureissoinclusive,itincludesvirtuallyeverythingthat agroupofpeoplethink,say,doandmake.Followingthedefinitionofsociologists,theterm culturereferstothetotalpatternofbeliefs,customs,institutions,objects,andcharacterizesthelifeofhuman community.“Cultureconsistsofallthesharedproductsof … 相似文献
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"Midnight"is a poem written by Archibald·Lampman,a Canadian poet,who loved nature very much,but his poor health prevents him from being very active in the outdoor life.So he is often the quite,thoughtful observer of nature in his poems.This article mainly talks about how to appreciate the poem in the following aspects:word selecting,rhyme,sentence structure and atmosphere.After reading this poem,we cannot get rid of the air of horror and mystery."Midnight" reveals another aspect of the nature:wild,rough and unknown.There is something else in the nature that can awe human beings even though we don't know what it is. 相似文献
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孙淑珍 《承德职业学院学报》2004,9(3)
Chapter Ⅰ Introduction
Sitting in the rocking chair,Carrie dreams her future.This is the deep impression the novel"Sister Carrie"gives us,which is written by Theodore Dreiser(1871-1945),the great American realism writer. 相似文献
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张强 《北京体育大学学报》2004,27(8):1137-1139
运用临场观察统计法、访谈法、文献资料法以及归纳法等研究方法,对现阶段国内青少年足球守门员防守技术运用情况进行统计与分析研究.结果表明:判断反应与选位能力不足是青少年守门员防守技术失误的主要原因,预判失误与技术粗糙以及缺乏自信等导致青少年守门员对抗条件下难以有效发挥位置优势,强干扰情况时出击争夺球失误多,重视反应训练和提高接球动作质量要求是提高青少年守门员技术水平的重中之重. 相似文献
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万苏鸣 《南京体育学院学报(社会科学版)》2002,16(2):124-125
提高体校学生的语素质的主要途径是课堂教学。体校语教师在教学过程中必须根据学生身心特点．设置合理的结构模式，以便顺利实现教学目标。 相似文献