共查询到20条相似文献，搜索用时 78 毫秒
1.
①气体通过A瓶，浓H2SO4无明显变化，气体体积无变化；②气体通过B瓶，饱和Na2CO3溶液质量增加0．5g，气体体积无比变化；③气体通过C瓶后，再通过D管，灼热的CuO有红色物质生成，冷却后，气体体积变为888mL(标准状况)；④将上述气体 相似文献
2.
张佑琏 《山西师大体育学院学报》2003,18(4):99-101
以Bruce运动方案，测定了56名体院与普通大学学生运动中潮气量(Vt)、通气量(VE)、呼吸频率(RR)及潮气末CO2分压(PetCO2)等气体代谢指标，结果显示前三项指标随负荷增加呈非线性增长特征。结果还表明，AT值前Vt上升幅度大于RR，AT值后VE进一步增大，则更多依赖于RR的增加。运动极限时PetCO2升至最高，两组实验者不具差异。 相似文献
3.
《四川工程职业技术学院学报》2017,(3):54-56
针对于低温往复泵输送介质的低温易汽化特性,怎么保证泵具有较高容积效率是个难题。低温往复泵的容积效率影响因素主要有:进、排液阀泄漏;活塞泄漏;阀门关闭滞后;液体汽化导致进液为气液混合状态,使介质可压缩性增加。通过试验验证,减少气液混合状态可提高泵的容积效率。 相似文献
4.
《沈阳大学学报（自然科学版）》2015,(2)
采用化学镀方法在45钢表面制备Ni-P-纳米SiO2化学复合镀层,较系统地研究了化学镀液成分及施镀温度、pH值等参数对镀层形成的影响,通过扫描电子显微镜(SEM)和能量色散光谱(EDS)分析了Ni-P-纳米SiO2镀层的形貌和成分.实验结果表明:主盐、还原剂、络合剂、温度、pH值对Ni-P-纳米SiO2镀层的沉积速率有较大的影响,实验确定的最佳主盐质量浓度为25g·L-1、还原剂质量浓度为30g·L-1、施镀温度为86℃、pH值为4.5,所得镀层均匀、致密. 相似文献
5.
《四川工程职业技术学院学报》2017,(1):58-60
采用真空烧结方法制备了YG8硬质合金。研究了压制压强、保压时间和稀土(Y_2O_3)添加量对合金性能的影响。结果表明:压强和保压时间对合金的性能影响不大;合金的密度、硬度和抗弯强度随Y_2O_3含量的增加表现出先升后降的势态;当压强为100MPa,保压时间为1min,Y_2O_3含量为1wt%Co含量时,合金获得了更优异的综合性能,其密度、硬度和抗弯强度值分别达到14.77g·cm~(-3)、92.2HRA和1825MPa。 相似文献
6.
采用含蜡模拟油和空气为实验介质，利用蜡沉积实验环道，研究间歇流流型下气、液相折算速度和温度对蜡沉积速率的影响，并结合高温气相色谱探讨沉积物碳数分布的变化规律。结果如下：在间歇流流型下，沉积物分布在整个管壁内，且形状随气、液两相折算速度的变化而变化；平均蜡沉积厚度随着气相折算速度的增大而减小，随液相折算速度的增加先增后减；固定管壁温度不变，平均蜡沉积厚度随着油温的增加先增加后减小；固定油温不变，蜡沉积量随着壁温的增加逐渐减少；气液相流速的增大均会导致沉积物的硬度增大（表现为沉积物碳数分布的变化）。 相似文献
7.
应用计算流体力学方法对高温下的线板式静电除尘器进行数值模拟，建立综合考虑温度场、电场、流场和颗粒动力场的多场耦合模型。采用有限体积法对计算域进行离散进而求解电场，采用欧拉-拉格朗日方法求解气固两相流动。研究温度对于静电除尘器内颗粒受力的影响。结果表明：随着温度的升高，颗粒所受的静电力减小而Saffman升力、布朗力和曳力均增大；曳力随温度的增加速率比静电力变化快，这可能是导致高温下除尘效率降低的原因。 相似文献
8.
采用浸渍法改性活性炭对SO2废气脱硫进行实验研究,结果表明：分别经过KI、Zn（NO3）2、HNO3改性的活性炭吸附效果较好。在吸附温度25℃,SO2浓度2900ppm,空速0．26m／s,吸附剂用量为2g的条件下,经KI、Zn（NO3）2、HNO3改性的活性炭吸附能力分别提高了116％、25％和16．7％。 相似文献
9.
目的:探讨室内运动场馆O2和CO2的变化浓度对学生体质健康的影响,通过实时监测,确定适宜学生身心健康运动的O2和CO2浓度范围.方法:实时监测240名学生室内运动场馆活动时的温度、O2和CO2浓度;测试受试者递增负荷运动心率和血乳酸并记录分析.结果:受试者活动40min,室内运动场馆CO2达到0.113％,临近最低标准;15min后心率阈值达到155.46 ±6.3次/min;3min后受试者血乳酸阈值4.86mmol/L.结论:安静状态下,受试者在室内和室外运动场馆的心率无明显差异,进行递增运动负荷至力竭,室内运动场馆心率上升明显,受试者室内运动的心率阈值比室外运动提前3min.受试者进行递增运动负荷持续至力竭,室内受试者血乳酸浓度上升幅度明显高于室外,血乳酸阈值比室外提前5min. 相似文献
10.
抛体运动演示实验 ,通常以小钢球作为抛体 ,实验现象一闪而过 ,无法直接观测小球运动轨迹。虽然可用描点法绘出小球运动轨迹 ,但其操作十分烦琐 ,课时效率低 ,也极易分散学生注意力 ,实施效果很不理想。为此 ,笔者制作了如图 1所示的抛体运动轨迹测控仪。图 11 气仓瓶 2 压缩空气 3 单车气嘴4 喷射针 5 滴液管及开关 6 调控板该仪器用有色液体 (可视为由无数个连续的液珠构成 )代替小钢球作为抛体 ,通过改变气仓压强、抛射高度及抛射角度 ,可简捷地控制液体抛射速度和运动径迹 ,演示抛射速度、抛射高度及抛射角度对抛体运动轨迹… 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