共查询到20条相似文献，搜索用时 46 毫秒
1.
根据线心曲面,面心曲面和抛物柱面的特殊性,依据已有《解析几何》理论,得出了化简这三种曲面方程为标准形的灵活简便的方法 相似文献
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车用氙气大灯的非球面透镜面形状精度是影响照明光线聚光好坏的主要因素,因此如何使非球面元件具有更高的形状精度已成为一个重要的研究内容。本文以Ф51.5mm的凸形非球面镜的接触式检测为研究内容,利用代数距离的最小二乘法,提出了对轴对称旋转非球面的无基准测量数据进行椭圆拟合的方法,得到采样数据中的方向和位置信息,并据此从面形子午线测量数据中消除安装倾斜误差对评定非球面透镜面形精度的影响。 相似文献
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根据线心曲面，心心曲面和抛物柱面的特殊性，依据已有《解析几何》理论，得出了化简这三种曲面方程为标准形的灵活简便的方法。 相似文献
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探讨钢筋混凝土T形柱最不利荷载角及其影响因素.利用编制的钢筋混凝土异形柱截面全过程数值分析程序,通过对多种工况下钢筋混凝土异形柱正截面承载力的计算分析,结果表明异形柱最不利荷载角的影响因素主要是轴压比;截面尺寸对最不利荷载角有些影响;而混凝土强度、纵筋配筋面积对最不利荷载角的影响很弱.研究结果为钢筋混凝土异形柱的设计和异形柱的可靠性分析提供参考依据. 相似文献
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阐述了平板—异形柱结构的适用范围、结构选型、材料选择、截面尺寸的确定和结构的内力分析方法,在此基础上得出了平板—异形柱结构构件的配筋计算方法和配筋构造要求,以供设计人员参考。 相似文献
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陈鹏 《泰州职业技术学院学报》2008,8(3):5-6
《混凝土异形柱结构技术规程（JGJ149—2006）》提出按照最小配箍特征值确定箍筋加密区体积配箍率要求,相应箍筋配置方案需通过计算求得,应用不便。按《规程》要求,根据异形柱的抗震等级、截面形式与尺寸、混凝土强度等级、轴压比的大小,给出了具体的箍筋配置方案,并形成图表,方便设计人员设计、核查。 相似文献
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田秀梅 《天津职业院校联合学报》2002,4(3):98-102
在研究焊接工艺时,经过理论分析与推导,得到了设计双轴对称焊接H形压弯柱经济截面所应满足的条件,可以直接确定出经济合理的截面尺寸,计算简便,便于应用。 相似文献
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本文采用框架加荷系统对高强砼柱进行了反复荷载下的试验。以位移延性系数为指标,对影响高强砼柱延性的各因素进行了分析,提出了高强砼柱轴压比的限值和柱加密区箍筋最小体积含箍率的建议值,对高强砼偏心受压柱强度计算的基本假定进行了修正。供设计人员参考。 相似文献
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快速确定火炬系统配管尺寸 总被引：1，自引：0，他引：1
Zhan Shiping 《大连大学学报》1992,(4)
本文采用一种新的计算可压缩流体的方法用于火炬系统的配管尺寸设计,在管网布局确定后,可由已知的出口压力 P_2反算管道入口压力 P_1,进而确定各段管线的管径,同时还可得到各段管线出口处的马赫数、摩擦因子等参数.通过限制马赫数及将计算的入口压力与装置允许最大背压相比较,使设计参数进一步优化,同时通过增加计算的循环次数,可方便地处理带有支管的复杂管网系统。整个计算过程均编制了FORTRAN 计算程序,为火炬系统的配管问题提供了一个既安全又经济的最优化设计方案,以使化工厂或炼油厂在这方面的投资减至最少. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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李晓劲 《读与写:教育教学刊》2008,5(6)
Public speaking, as one kind of speech act, the speaker uses some pragmatic strategies, for example,the use of personal pronoun, in order to achieve effective communication. Speakers use the first personal pro-noun we and the second personal pronoun you conventionally, also there are some deviations in the use of person-al pronouns. However, theses kinds of uses have to be explained and understood in such a specific context. 相似文献
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宋少华 《读与写:教育教学刊》2008,5(5):3-5
This essay mainly studies the linguistic features of News English on stylistics.The study is made mainly on three aspects of News English.They are lexical features.sentence features and grammar features of News English.Through the study we find that News English,as a distinctive and new language.has its own lin-guistic features in words, sentences and grammar. 相似文献
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正Nong Luhuan had a wild dream when he was little.He wanted to become a cartoonist and publish books of his own.Now,the 22-year-old art design major at Sichuan Fine Art Institute has achieved his dream.His micro blog cartoon has more than 260,000 followers and he will publish his first book this week.农璐焕小时候有一个疯狂的梦想,他想成 相似文献
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正The hardest arithmetic to master is that which enables us to count our blessings.世界上最难的算术题是如何清点我们的祝福。According to legend,a young man while roaming the desert came across a spring of delicious crystal-clear water.The water was so sweet,he filled his leather canteen so he could bring some back to a tribal elder who had been his 相似文献