1) resonant problem
三点边值共振问题
1.
Firstly,whenwe can transform the resonant probleminto the non-resonant problemSecondly,we show that the existence of positive solutions is equal to the existence of nonzero fixed points for the integral operator.
本文利用扰动的方法和锥拉伸与压缩不动点定理讨论了非线性常微分方程三点边值共振问题正解以及多正解的存在性。
2) three-point bending
三点弯曲
1.
Experimental study of crack opening compliance of a three-point bending beam;
三点弯曲裂纹张开柔度的实验研究
2.
Deformation of sandwich beams with spherical pore Al alloy foam core in three-point bending;
球形孔泡沫铝合金三明治梁的三点弯曲变形
3.
Deformation of sandwich beams with Al foam cores in three-point bending;
泡沫铝层合梁的三点弯曲变形
3) three points arc
三点圆弧
1.
Introduces the algorithm of three points arc in maximum error approximating curve,theoretically making arc approximated sections minimum.
讨论了三点圆弧最大误差逼近曲线的算法,理论上使圆弧逼近的段数达到最少。
4) three point bending
三点弯曲
1.
The clad material of stainless steel and aluminum alloy is fabricated by semi solid joining method,according with ASTM-E813,three point bending test is carried out,and the fracture behavior of bonding interface is studied with FEM and theory analysis.
研究结果表明:采用三点弯曲实验方法,可以显著降低界面裂纹尖端的复杂应力水平;半固态连接不锈钢-半固态铝合金界面断裂为典型的脆性断裂,界面临界断裂韧性略低于基体铝合金的断裂韧性。
2.
According to three point bending test, the complete processes from the initiation and propagation of micro cracks to the macroscopic failure of the concrete specimen and mortar specimen are simulated through RFPA 2D (Rock Material Failure Process Analysis) Code.
根据混凝土试样三点弯曲试验 ,利用RFPA2D数值模拟系统对砂浆和混凝土三点弯曲试样中预制裂纹的扩展直至试样宏观破裂的整个过程进行了模拟分析 ,指出了混凝土组成材料的非均匀性对裂纹扩展路径的影响。
3.
Stress and energy absorption indexes for rat femurs were measured with the method of three point bending.
对 Na F染毒后再行给药的大白鼠股骨利用三点弯曲强度测试方法进行应力、能量吸收等指标的测试 ;对按不同剂量给药后的大白鼠股骨的强度、能量吸收等指标进行比较和分析 ,据此对氟康宁胶囊、骨苓丸的疗效进行实测分析。
5) three-point method
三点法
1.
Measurement techniques of cylindricity with three-point method;
圆柱度的三点法测量技术
2.
The application of Error Separation Techmique or EST to the on-line measurement of straightness error with three-point method is studied.
对三点法误差分离技术(EST)应用于在线测量直线度误差进行了研究,并在推导数学模型的基础上进行了仿真计算。
3.
In this paper a new method, three-point method, for solving the laser beam drift in its directions is presented.
提出运用三点法补偿激光束不稳定性误差,在时间和空间上获得较稳定的激光束。
6) three-point bend
三点抗弯
1.
The practical bonding property of the interface and the bending resistance were demonstrated using three-point bending tests carried out with the prepared aluminum alloy foam sandwich panel.
通过对制备出的泡沫铝三明治进行三点抗弯实验验证界面的结合性和整体的抗弯性。
参考词条
补充资料:微分边值问题的差分边值问题逼近
微分边值问题的差分边值问题逼近
approximation of adifferentia) boundary value problem by difference boundary value problems
微分边值问题的差分边值问题通近{即proxlm浦训ofa山fferential肠扣nd即卿阁此pn由lemby山ffe悦n沈b侧n-da仔耐ue pn由lems;all即旧K。肠,au舰皿呻加脚.胆,日峨成峥ae侧甫,阴,加琳3“心犯川角! 关于未知函数在网格_[的值的有限(通常是代数的)方程组对微分方程及其边界条件的一种逼近.通过使差分间题的参数(网格步长)趋于零,这种逼近会越来越准确. 考虑微分边值问题L:、二0,lu!l二O的解“的川算,其中L“=0是微分方程Iu!二0是一组边界条件.u属于定义在边界为r的给定区域从上的函数所组成的线性赋范空间U设D、。是网格(llL微分算子的差分算子通近(approx,matlon of a ditTere;ltl;,1 op-erator by differe们优。详rators)),并设U*是rlJ定义价该网格上的函数。*所组成的线性赋范空间.设卜j、厂函数v在几;的点上的值表卜在打。中引进范数使得对任意的函数,;〔创,以手‘等式成盆: 恕伽训、·三{训‘现在用近似计算“在D*。中的点上的值表luJ的问题一/*{司、=0代替求解“的问题.这里了*【川。是一组关一)网格函数。*任U。的值的(作微分)方程 设。*是U、中的任意函数.令二。。、二叭片设小是线性赋范空间,对任意的叭6u*有势*。中,二称才*“*二0是对微分边值问题L“二0,l川,一0石其解空间_L的P阶有限差分逼近,若 {}了*lu奴{}。*二O(h尸)方程组J、“*=0的实际构造涉及分别构造它的两个子方程组IJ*u*=o和l、u*}。二0.对L*u儿=0,使用微分方程的差分方程通近(approximat,on。》f a dll化r‘:ntia}equation by differer,沈equations).附加方程I。,、、}:=(”利用边界条件l川。=0来构造. 对无论怎样选取的U、与中人的范数,上面所描述的逼近都无法保证差分问题的解u、收敛到准确解“(见{2]),即等式 {,砚}1 lul*一“六{}、;。成立. 保证收敛性的附加条件是稳定性(见{3!,{5!18]),有限差分间题必须具有这一性质.称有限差分间题了r八“、=0是稳定的,若存在正数占>oh。>0使得对任意毋*‘。*,}一甲*{}<。,h<权,方程一气:二甲*有唯一解:*已认,且此解满足不等式 1}:儿一u*}}:。“{}。、}{。,其中C是与h或右端扰动叭无关的常数,“、是无扰动问题一/*。=O的解‘如果褂于问题的解u存在同时差分问题气“、二O关于解“以p阶精度逼近微分问题,而且是稳定的,则差分问题具有同样阶的收敛性,即 }1[uL一吟}l叭=O(hp). 例如,问题 ,,、_au au L(“)三.举一拼=0,I>0.一的
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