Numerical Study of the Feed Flow and Its Influence on the Separation Efficiency of a Gas Centrifuge

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Influence of a Teacher''''s Physical Presence on Class

In the teaching process,teachers deliver knowledge to students,but often neglects the details beyond knowledge.The appearance and behavior of a teacher often exert unconscious influence on students.The physical presence of a teacher will exercise an invisible and formative influence on students' dispositions and temperaments.     

Influence of Reaction Parameters on Water Absorbency of Starch Grafted Superabsorbents

ＩｎｔｒｏｄｕｃｔｉｏｎＳｔａｒｃｈｉｓａｋｉｎｄｏｆｎａｔｕｒａｌｐｏｌｙｓａｃｃｈａｒｉｄｅｗｉｄｅｌｙｕｓｅｄａｓｒａｗｍａｔｅｒｉａｌｉｎｃｈｅｍｉｃａｌｉｎｄｕｓｔｒｙ .Ｗｉｔｈｔｈｅｄｗｉｎｄｌｉｎｇｓｕｐｐｌｉｅｓｏｆｐｅｔｒｏｌｅｕｍ ,ｔｈｅｕｓａｇｅｏｆｓｔａｒｃｈｗｉｄｅｌｙｓｐｒｅａｄｓｉｎｄｉｆｆｅｒｅｎｔｆｉｅｌｄｓｂｅｃａｕｓｅｓｔａｒｃｈ ｓａｂｕｎｄａｎｃｅａｎｄｌｏｗｃｏｓｔ.Ｇｒａｆｔｐｏｌｙｍｅｒｉｚａｔｉｏｎｏｆｓｏｄｉｕｍａｃｒｙｌａｔｅｏｎｔｏｓｔａｒｃ…     

Some Aspects on the Teaching of Reading

ＳｏｍｅＡｓｐｅｃｔｓｏｎｔｈｅＴｅａｃｈｉｎｇｏｆＲｅａｄｉｎｇ￥ＣｕｉＱｉｍｉｎ１ＴｈｅＰｕｒｐｏｓｅｏｆＲｅａｄｉｎｇＲｅａｄｉｎｇｉｓｎｏｔａｐａｓｓｉｖｅｐｒｏｃｅｓｓｔｈａｔｂｅｇｉｎｓｗｉｔｈｔｈｅｐｒｉｎｔｏｎｔｈｅｐａｇｅａｎｄｅｎ...     

On the Influence of Cyber-speak on Communication

Internet today is not only a kind of high-technology,but also considered to be a kind of cultural phenomenon.As its carrier,cyber-speak has brought convenient and quick communication since its advent.But due to unbalanced development of Internet and misuse of cyber-speak,traditional Chinese language is influenced negatively.In this paper,through questionnaire about Internet conducted among 20 young interviewees and 20 senior interviewees,results shows that the young are more willing to accept cyber-speak and even use it in daily communication,but unlimited use,plus senior citizens' conservative attitude toward Internet,brings about the communicative gap to some extent.In fact,as a kind of complementary part of our traditional language,cyber-speak will not affect direct communication with right understanding and reasonable use.     

Some Remarks on the Degree of Crystallinity Measured on DSC

A modified mathematical model based on the melting and recrystallization of an initial distribution of melting temperatures predicts the melting behavior of polymer in differential scanning calorimetry ( DSC ) , taking into account of changes in heat of fusion with melting temperature of crystal and average heat capacity of sample. It has been used to analytically prove that the crystallinity measured on a DSC diagram could not be equal to the weight percentage of crystalline state in the initial specimen. The deviation of the measured crystallinity, as observed relevant to the melting and recrystallization processes, is caused by the changes of the heat of fusion with the melting temperature of crystals, as well as the difference of heat capacities of liquid and solid state polymer. Furthermore, upper and lower limits of the deviation have been discussed.     

Effect of the Design Parameters on the Performance of Inner-Recycling Continuous Sand Filter

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｍｏｄｅｒｎｅｎｇｉｎｅｅｒｉｎｇａｐｐｌｉｃａｔｉｏｎｓ,ｆｉｌｔｒａｔｉｏｎｈａｓｂｅｃｏｍｅａｗｉｄｅｌｙｕｓｅｄｗａｔｅｒ ｔｒｅａｔｍｅｎｔｐｒｏｃｅｓｓｉｎｔｈｅｐｒｏｄｕｃｔｉｏｎｏｆｐｏｔａｂｌｅｗａｔｅｒａｎｄｉｎｗａｓｔｅｗａｔｅｒｔｒｅａｔｍｅｎｔ.Ｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｆｉｌｔｅｒｓｉｎｄｒｉｎｋｉｎｇｗａｔｅｒｔｒｅａｔｍｅｎｔｈａｓａｌｏｎｇｔｒａｄｉｔｉｏｎ ,ｔｈｅｄｅｓｉｇｎａｎｄｔｈｅｏｐｅｒａｔｉｏｎａｒｅｂａｓｅｄｏｎｌｏ…     

Influence of Spinning Variable on the FR Properties of Yarns

Broadly considered, spuming variables influences the properties of yarns. However there is scant information on the influence on the fire retardancy (FR) properties. The present work aims to establish the influence of the spinning method, twist, and fibre distribution in a blended yarn, on the FR properties of the yarn.     

Influence of Damage Evolution on the Failure Surface of Concrete

0 IntroductionTihse a f agilruardeu aolf pcroonccerseste wshuibcjhec itsed ditfofe ernenvitr ofrnommentthale afcatiilounrespatternin general strengthtest .The change of material statescaused by the damage evolution will affect the concretestrengthin a certain kind of concrete.For years ,domestic studies have focused on the effect ofabominable environmental factors on mechanical property ofconcrete,and have resulted in some achievements[1-12]. Thestudies of some current research results reveal …     

Study on Traditional Martial Arts＇ Influence on Junior Students＇ Physical Self--concept of Hui Nationality

为了解民族传统武术对回族中学生身体自我概念的影响,促进民族传统体育的发展,本文采用问卷法和数理统计法,就青海省西宁市回族中学开设和未开设民族传统武术课程的学生进行了对比调查研究.结果表明,是否开设民族传统武术课程对回族中学生的身体自我概念的影响存在显著的差异.健康、身体肥胖、整体身体、灵活和自尊方面,开设武术课的学生得分高于未开设的学生.在开设民族传统武术课程的学生中,身体自我概念部分维度存在显著地性别差异.开设民族传统武术课程对回族中学生形成积极的身体自我概念具有重要作用.     

超音速气固两相分离试验研究

建立了超音速气固两相分离装置试验系统,在室温和不同喷管进口全压下,对空心玻璃珠颗粒的分离效率进行了试验研究.试验结果表明:当喷管进口全压在482~537 kPa范围时,超音速气固两相分离试验装置对Sauter平均直径9.84μm颗粒的总分离效率为57.83%~67.28%,对直径大于8.31μm颗粒的分离效率为75.73%~80.52%,对直径在15μm以上颗粒的分离效率为96%~100%,表明颗粒直径越大,分离效率越高.由此可见,超音速气固两相分离方法是可行的.试验研究为超音速气固两相分离技术的进一步深入研究和应用提供了有用的参考.     

蜗壳结构因素对预热器旋风筒分离效率的影响

本文在理论分析的基础上,详细描述了蜗壳形状及尺寸对旋风筒分离效率的影响,并进行了验证,提出了提高旋风筒分离效率的途径.     

充气量和供料对脉冲级联稳态丰度分布的影响

脉冲级联是新提出的同位素分离级联的概念,了解脉冲稳态丰度分布是开发脉冲级联应用中的一个重要方面。为了明白稳态丰度分布的影响因素并加以利用,以提高脉冲级联的分离性能,利用一种结合了Q迭代法的时间推进方法求解脉冲级联的稳态丰度分布,并将分离效果用平均分离系数来整体描述。通过对矩形脉冲级联分离钨同位素的讨论,分析了充气量和供料对稳态丰度分布的影响。结果表明:级联的平均分离系数不随级联各级离心机充气量的变化而变化,但随着管道充气量与供料量之比的增加而增大;在级联中部存在一个最佳供料位置,使得平均分离系数最大。     

结构参数对内联式脱液器分离性能的影响

内联式脱液器是一种基于离心力作用并利用气液两相之间密度差进行气液相间分离的紧凑、高效型气液分离设备,因其可以减小自重及节省空间,且可在平台及海底应用而受到越来越多的关注。建立了一组内联式脱液器的数值结构模型,采用计算流体力学(CFD)方法对其进行数值模拟研究。通过分析内联式脱液器内部的速度场及压力场分布情况,总结出影响内联式脱液器分离效率及压力损失的关键结构参数,包括叶片结构参数、分离腔长径比、气体出口管管径及深入长度、排液管管径等。同时,针对叶片结构参数(叶片数目及导向出口角)对内联式脱液器分离性能的影响,进行了数值模拟研究,推选出涡流发生器内最优的叶片结构参数(叶片数目为8,叶片出口角度为45°),从而可为后续内联式脱液器的结构优化、分离性能提升以及降低能耗提供一定的参考。     

瓦斯泥物料性质及选别方法的试验研究

试验研究表明，瓦斯泥主要有用成分为铁矿物，以赤铁矿和磁铁矿的形式存在；采用单一的磁选、重选、浮选方法铁矿物均不能得到充分有效地回收，而采用联合选别流程获得了较好的指标，推荐了重选－反浮选－磁选联合选别的原则流程。     

红外线燃气灶与大气式燃气灶热效率的比较

通过实验得出陶瓷板红外线家用燃气灶和大气式家用燃气灶的热效率,并对结果进行分析比较,为用户选择更合理、更节能的灶具提供实验依据。     

双组分制备级气相色谱分离过程的数值模拟

在研究分析性气相色谱分离模型的基础上,提出并建立了双组分制备级气相色谱分离过程的数学模型,模型包括物料平衡方程、吸附等温方程和传质方程。描述该过程的数学模型是隐形非线性偏微分方程,通过数值求解模拟分析了柱填充空隙率和流动相流量等不同操作参数对色谱分离的影响,并与文献实验值相比较,结果基本吻合,最大相对误差在4．86％以内,为实现工业放大和生产的最优化操作和控制提供了一定的指导作用。     

振动参数对筛分效率影响的实验研究

选用经过干燥的硅粉、钼粉和锌粉物料作为典型物料研究对象,通过实验研究振动参数对颗粒筛分效率的影响.首先,研究振动频率、偏心块夹角、料层厚度、不同物料性质对普通旋振筛筛分效率的影响,得出典型物料在普通旋振筛作用下的最佳振动参数;然后进行超声波振动实验,实验表明,超声波振动能够有效打散细粉物料颗粒团聚体,解决筛孔堵塞问题,显著提高了筛分效率.根据实验结果可以获得硅粉物料颗粒在普通振动和超声波振动综合作用下的最佳组合参数.     

酸性气体CO2的膜分离技术研究进展

气体膜分离法正发展成为分离酸性气体的一项重要技术。介绍了其基本原理,国内外开发的新型膜材料及性能的研究进展,指出了发展前景。