In the time varying electromagnetic field,we have solved Helmholtz equation of a scalar potential under the spherical polar coordinate,and obtained its general solution.
求解了时变场中球坐标系下标量位ψ(r,t)的亥姆霍兹方程。
Helmholtz equation s finitedifference method is applied to ridgedown rectangular waveguide to investigate the influence on transmission characteristics when the ridge is in the central part of the waveguide besides its change of dimension.
利用亥姆霍兹方程的有限差分格式,研究在下陷单脊矩形波导中,脊在中心位置且几何尺寸变化对传输特性的影响。
Helmholtz equation finite difference method is analyzed and applied to it.
本文采用亥姆霍兹方程有限差分法分析,从而获得精确的窄边双脊波导传输特性参数。
Study on p-ρ-T properties of Helmholtz equation of state for air;
空气亥姆霍兹能方程p-ρ-T性质考察
A multi-scale finite element method for the exterior problem of the Helmholtz equation in an oceanic waveguide;
浅海波导赫姆霍茨方程外问题多尺度有限元法
According to the special no-zeros structure matrix derived from the Helmholtz equation,an effective ILU decomposition method is presented.
针对GRAPES模式所特有的具有对角优势结构的赫姆霍兹方程系数矩阵,提出了一种有效的ILU分解方案,并将分解得到的预条件子应用到模式核心的动力积分计算迭代算法中,从而达到加速算法收敛,提高模式软件整体性能的目的。
Based on 2-deminsion wave equation using Fourier transform this paper gives Helmholtz equation and the generalized WKB,which is a new approximation method for solving difficulties in wave field analogy and difficulties of inversion in seismic exploration.
针对地震勘探中的波场模拟和反演困难等问题,本文从二维波动方程出发,采用Fourier变换得到了赫姆霍兹方程,并创造性地提出了一种全新的近似解法-广义WKB法;该法可以更加近似赫姆霍兹方程,且它的解中包含WKB的近似值。
Tim, Tim, Tim. Pick up the little stick!
提姆，提姆，提姆。拣起那亘小木棒！
Tim, wash your socks.
提姆，洗洗你的袜子。
Ann and Tim want a parrot.
安和提姆想买一只鹦鹉。
Tim, buy some vegetables for me.
提姆，去帮我买些蔬菜吧。
Scrooge was a second father to Tiny Tim.
他变成小提姆的义父。
Tim is drinking tea in front of the TV.
提姆在电视前喝茶。
Tim and Tom taped two tom-toms together. Then Tim and Tom tapped the tom-toms.
提姆和汤姆一起录了两支印第安手鼓歌。然后提姆和汤姆轻轻地敲着印第安手鼓。
Tim, can you clean your room?
提姆，你能打扫你的房间吗？
Tim tried to catch her arm but she evade him.
提姆想要抓住她的手臂但她避开了他。
But this time, Tiny Tim is not there.
但那时候小提姆已不在了。
Ann, Tim and their mother are in the market.
安、提姆和他们的妈妈在市场里。
Tim: More than angry, he was absolutely livid.
提姆：不但很生气，简直怒不可遏。
Time aied to catch her arm but she evade him
提姆想要抓住她的手臂但她避开了他
Tim, you shouldn't yell at May. It wasn't her fault.
提姆，你不该对梅大小声。又不是她的错。
He had lost his case and had to borrow Tom's pyjamas.
他丢失了手提箱，不得不向汤姆借睡衣。
It was Jim who came across with our secret information to the enemy
吉姆把我们的秘密情报提供给敌人。
Tom held forth his new plan for building the powers station.
汤姆为建造这所电站提出了新的计划。
Each time we mention Tom, Helen flew into a rage.
每当我们提到汤姆，海伦就暴跳如雷。