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1.
河水中溢油分散剂的分散效果检测 总被引：1，自引：0，他引：1
为更好地规范在内河使用溢油分散剂,选取中密度的沙重原油作为试验标准用油,选择紫外—可见分光光度计检测光波长为518 nm,通过测定1 min乳化率得到7种国内外典型的溢油分散剂在人工河水中对溢油的分散效果.结果表明：6号和7号溢油分散剂不太适用于河水;2号、3号和4号溢油分散剂在河水中对溢油的分散效果较好;1号和5号溢油分散剂在河水中对溢油的分散效果特别优良.该方法可以作为测定内河中溢油分散剂分散效果的实验室标准化方法. 相似文献
2.
在水温20~23℃、pH值6~7、溶解氧6.0~8.0mg/L的条件下,采用半静水式生物毒性实验法研究不同浓度的Cu、Cd和Cr对秋浦花鳜胚胎的急性毒性效应,旨在为池州地区特有品种秋浦花鳜的生态健康养殖和资源保护提供一些有价值的参考。研究结果表明Cu、Cd、Cr对秋浦花鳜胚胎24h和48h的LC50分别为:0.33mg/L、0.26mg/L,0.13mg/L、0.10mg/L,153mg/L、124mg/L;SC分别为0.05mg/L、0.02mg/L、24mg/L;毒性强度CdCuCr。 相似文献
3.
较系统地对甜柿(Diospyros kaki Thunb.)品种"富有"柿组培苗的继代增殖、叶片不定芽再生和生根的培养条件进行研究.试验结果表明:"富有"柿的最佳长期继代培养基为MS ZT2.0 mg/L IAA 0.1 mg/L;高效不定芽再生体系在培养基MS(1/2N) TDZ 0.4 mg/L ZT1.0 mg/L培养30 d之后,转入培养基MS(1/2 N) IAA 0.1 mg/L ZT 2.0 mg/L中,其分化率达到90.3%以上,外植体平均芽数为4.6;生根选取在培养基1/2 MS IBA 1.0 mg/L培养基中暗培养8 d,生根率为93.1%. 相似文献
4.
刘志良 《黑龙江生态工程职业学院学报》2012,(1):6-7
以绿萝、金边虎皮兰、吊兰、中斑吊兰为实验材料,采用密闭玻璃容器熏气法,测定4种植物对甲醛和苯的吸收量,比较4种植物对甲醛和苯的吸收能力。结果表明,处理36h后,单位叶面积甲醛吸收量最大的是绿萝,吸收量为2.11mg/m2;最小的是中斑吊兰,吸收量为1.33mg/m2。单位叶面积甲醛吸收能力大小依次为:绿萝>金边虎皮兰>吊兰>中斑吊兰。吊兰和中斑吊兰对苯基本没有吸收。处理36h后,单位叶面积苯吸收量最大的是金边虎皮兰,吸收量为29.76mg/m2;其次是绿萝,吸收量为27.69mg/m2。所以,要合理搭配植物才能达到最好的空气净化效果。 相似文献
5.
西伯利亚百合种球鳞片愈伤组织的形成及分化的培养基优化 总被引：1，自引：0，他引：1
以东方百合种系西伯利亚的种球鳞片为材料,NAA、6-BA、LH及蔗糖为实验因子,每因子设3个水平,添加到MS培养基中,研究其对种球鳞片形成愈伤组织、小鳞茎的分化、小鳞茎的抽叶和生根数的影响并筛选出种球鳞片最佳培养基.结果表明：形成愈伤组织的最佳培养基为MS＋50g/L蔗糖＋0.2mg/LNAA＋2mg/L 6-BA＋100mg/L LH;愈伤组织分化的最佳培养基为MS＋70g/L蔗糖＋0.5mg/L NAA＋0.5mg/L6-BA＋100mg/L LH;最佳生根培养基为MS＋70g/L蔗糖＋0.5mg/L NAA＋0.5mg/L 6-BA＋100mg/L LH;愈伤组织分化小鳞茎最佳培养基为MS＋50g/L蔗糖＋0.2mg/L NAA＋1mg/L 6-BA＋100mg/L LH. 相似文献
6.
王文清 《济宁师范专科学校学报》2013,(3):20-24
利用常用绿化树种的落叶作为吸附剂,处理含Cu2+的重金属模拟废水,研究了Cu2+的初始浓度、吸附剂用量和温度、pH等因素对吸附效果的影响,并进行了吸附等温式和动力学模型拟合.结果表明,Cu2+初始浓度由50mg/L增加到300mg/L时,对应的落叶最大吸附量由18.57mg/g增加到100.75 mg/g;pH由4增加到8时,Cu2+的平衡吸附量由30.2 mg/g增加到38.4 mg/g.针对不同的Cu2+初始浓度进行了Langmuir和Freundlich吸附等温式拟合,动力学研究进行了一级动力学和二级动力学模型拟合.结果表明落叶对Cu2+的吸附与Freundlich模型和二级动力学模型拟合度较好. 相似文献
7.
欧洲花楸(Sorbus aucuparia)是世界园林重要的彩叶树种,近年来我国开始应用。该树种种子深度休眠,播种育苗发芽率很低,园林生产用苗木短缺,组织培养育苗可以短期内为生产提供大量优质苗木,解决生产需要。通过研究,筛选出欧洲花楸组织培养育苗诱导培养基为:MS+6—BA2.0mg/L+NAA0.5mg/L,增值培养基:MS+6—BA2.0mg/L+NAA0.1mg/L,生根培养基:1/2MS+NAA0.5mg/L。 相似文献
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9.
温泉 《吕梁教育学院学报》2014,(2):64-66
以"郑杂五号"的西瓜品种种子为试验材料,采用营养液水培法,以1/2 Hoagland营养液为基础,设4个不同浓度的硒处理(Na2SeO3分别为0 mg/L、2 mg/L、4 mg/L、8 mg/L),每个处理栽培25株西瓜幼苗,在相同的条件下培养5周,研究不同硒浓度对西瓜幼苗地上部的保护酶(POD、SOD、CAT)活性、MDA含量和叶绿素含量的影响。结果表明:随着Na2SeO3用量的加大,西瓜幼苗SOD、POD、CAT活性都呈现出先下降后上升的趋势,丙二醛(MDA)含量呈现出先下降后上升的趋势,而叶绿素含量则是呈现出先上升后下降的趋势。通过试验,综合考虑西瓜幼苗长势及生理生化指标的测定,发现最适宜西瓜幼苗生长的硒浓度为2 mg/L。 相似文献
10.
表面活性剂SDS对水蓼种子萌发和幼苗生长的影响 总被引：1，自引：0，他引：1
以水蓼种子为研究材料,设置5个SDS处理浓度(0 mg/L、2mg/L、20 mg/L、40mg/L、60 mg/L),研究了不同浓度的表面活性剂SDS处理对水蓼种子萌发和幼苗生长的影响.结果表明,SDS浓度与水蓼种子的发芽率、幼苗平均生长高度和发芽指数呈显著的负相关关系(P<0.05),与发芽势呈极显著负相关关系(P<0.01). 相似文献
11.
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
12.
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
13.
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
14.
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
15.
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
16.
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
17.
"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
18.
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
19.
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
20.
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