共查询到20条相似文献，搜索用时 62 毫秒
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讨论了平面波在完纯导体界面附近的驻波形成及能量传输，得知距分界面固定距离处场量存在零值和最大值。 相似文献
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结构物表面纹理形态与土体颗粒分布对结构物-土体界面剪切性状具有显著影响。利用自行改制的直剪仪对钢-标准砂界面剪切特性进行研究,分析剪切应力-剪切位移关系、不同纹理深度下的峰值剪切应力变化规律及界面抗剪强度指标变化规律。结果表明：试验峰值剪切应力与法向应力呈正相关关系;垂直纹理方向剪切的峰值剪切应力大于顺纹理方向的峰值剪切应力;试验峰值剪切应力随纹理深度的增加而增加,之后保持某一稳定值上下波动;纹理深度存在临界值,集中在0.64～0.89 mm范围内,H/d50值集中在5.8～8.1范围内;粗糙界面的摩擦角比光滑界面大;界面摩擦角随纹理深度的增加而增大,大于临界值时,界面摩擦角将保持一稳定值。 相似文献
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采用小扰动展开法展开到三阶研究了一定压力支撑下的经典流体界面处发生的Richtmyer-Meshkov不稳定性,并按照已有Rayleigh-Taylor不稳定性中非线性饱和阈值的定义,给出了经典平面Richtmyer-Meshkov不稳定性非线性饱和阈值的解析式.研究表明,该饱和阈值不仅受到初始扰动波长的影响,还受到初始界面扰动幅值的影响;当不考虑界面扰动幅值效应时,该饱和阈值随初始扰动波长的增加而线性增加;用界面初始扰动波长无量纲后的该饱和阈值大约是0.11,略高于对应Rayleigh-Taylor不稳定性非线性饱和阈值. 相似文献
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黄国平 《南通职业大学学报》2001,15(2):30-33
本利用WINDOWS的API函数实现菜单的动态变化，有效改变SDI和MDI界面的子菜单的长度，并利用子菜单的TAG值改变子菜单的可视性，达到优化程度界面的目的。 相似文献
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单一电解质水溶液汽液界面张力的测定 总被引：1，自引：1，他引：1
本文选择滴体积法作为实验方法 ,建立了汽液界面张力实验装置 ,用纯液体界面张力值校验后 ,在 2 5℃下 ,测定了KNO3、ZnCl2 、kBr、K2 CO34个单一电解质水溶液体系在 0 0 5 2mol/L浓度范围的气液界面张力。实验结果表明 ,采用滴体积法所建立的实验装置能够准确并方便地测定电解质水溶液的汽液界面张力。 相似文献
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本文选择滴体积法作为实验方法，建立了汽液界面张力测定装置，用纯液体界面张力值校验后，在25℃下，测定了LiCl-NaCl，LiCl-KCI，NaCl-KCl，LiCl-NaCl-KCl四种混合电解质水溶液体系在0．1-4．5mol／kg浓度范围的汽液界面张力。讨论了混合电解质水溶液的界面张力随电解质浓度的变化规律。 相似文献
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介绍一种基于MATLAB曲线拟合界面实现的MoSi2发热体电阻率曲线拟合方法,并利用误差理论对拟合曲线进行误差分析。结果表明,采用三次多项式拟合曲线作为MoSi2发热体电阻率曲线具有较高的精度,该结论与由MATLAB曲线拟合界面拟合获得的SEE、Adj R-square值分析的结果相符合。 相似文献
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丁子号管幸生 《福建工程学院学报》2021,(6):600-606
为优化智能门锁界面的尺寸与功能布局,提出一种使用户操作最舒适的智能门锁的界面设计方案。基于用户偏好,研究产品界面功能的要素属性,构建界面功能排列试验模型。对受试者的试验数据进行拟合,分析受试者对各功能排列结果的统一程度,得出最优化的智能门锁功能界面设计方案。采用集值迭代法优化关联矩阵法的权重确定方式,将该方案和现有产品的方案进行评价对比。结果表明,该方案在用户操作体验方面优于现有方案,界面功能排列试验模型是可行的、有效的。 相似文献
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碳钢／钢结硬质合金覆层材料制备及界面分析 总被引：1，自引：0，他引：1
采用爆炸压实成形和低真空液相烧结扩散串联工艺在钢板表面制备钢结硬质合金覆层（SBCTC）．用SEM、硬度测试和EDS元素分布分析等方法证实碳钢／钢结硬质合金覆层（CSTC）界面．结果表明：CSTC结合界面致密性好,沿着界面法向方向Fe,C,W主要元素分布呈现明显梯度分布．W元素向碳钢一侧渗透超过100μm,由复式碳化物导致SBCTC侧硬度值达600—700HV之间．沿着CSTC界面法向（由SBCTC侧指向碳钢侧）扩散区硬度渐趋下降． 相似文献
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《实验技术与管理》2013,(10):34-37
以正己烷为油相,以Na2CO3-重烷基苯石油磺酸盐-HPAM(相对分子量1.2×1071.6×107)三元溶液为水相,用Tracker全自动液滴表面张力仪在45℃条件下测量不同浓度弱碱的三元复合体系/油界面扩张黏弹性。阐述了弱碱三元复合驱体系/油界面扩张黏弹性随扩张频率和碱浓度的变化规律。结果表明:随着碱质量分数的增加,三元复合体系/油界面扩张黏性模量、弹性模量都在弱碱质量分数为0.4%时出现极大值;随着扩张频率的增加,碱质量分数为0.4%的三元复合体系界面扩张弹性模量、黏性模量均呈下降趋势;其他碱含量的三元复合体系界面扩张弹性模量呈略微上升的趋势,界面扩张黏性模量基本不变且值非常小。 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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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. 相似文献
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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. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献