亥姆霍茲 的英文怎麼說
中文拼音 [hàimǔhuòzī]
亥姆霍茲
英文
helmholtz （hermann ludwig ferdinand,1821-1890,德國物理學家、解剖學家及生理學家）亥姆霍茲方程 helmholtz equation; 亥姆霍茲共振體 helmholtz resonator; 亥姆霍茲函數 helmholtz function; 亥姆霍茲線圈 helmholtz coil; 亥姆霍茲型非均勻介質 helmholtz inhomogeneous medium; 亥姆霍茲自由能 helmholtz free energy-
The strain energy density function equals the helmholtz.
應變能密度函數等於亥姆霍茲函數。Study on agnetic field of a circular current and helmholtz ' coils
圓電流和亥姆霍茲線圈磁場的研究Helmholtz function criterion
亥姆霍茲函數判據It is a member of the helmholtz association of national research centers ( helmholtz - gemeinschaft deutscher forschungszentren e. v. )
它是德國亥姆霍茲聯合會國家研究中心聯合會成員之一。A new coupled - mode theory based on scalar modes is presented for the anisotropic waveguide with random disturbance via helmholtz equation and a modified dielectric tensor
摘要從亥姆霍茲方程出發，得到了各向異性光波導在弱導近似下的耦合模理論。A simply and analytical formula of the axial light intensity distribution behind a circular aperture is derived by using the helmhotz - kirchhoff integral theorem and the kirchhoff ' s boundary conditions. it is studied the nonparaxial on - axis intensity distribution throughout the whole space behind a circular aperture. an accurate formula to calculate the fresnel number of circular aperture is presented and the validity of usual fresnel number formula is reexamined. by using the analytical formula and diffraction integral formula, some numerical simulation comparisons are done, and it is shown that the results of the two methods are completely coincident
用亥姆霍茲-基爾霍夫積分定理和基爾霍夫邊界條件，推導出了平面波經小圓孔非傍軸衍射時軸上強度的簡單解析表達式，研究了平面波經小圓孔后整個衍射空間非傍軸的軸上光強分佈.給出了計算圓孔菲涅爾數的精確公式，重新檢查了通常的菲涅爾數公式的有效性.數值計算顯示，應用解析表達式所得的結果與應用衍射積分公式所得的結果完全一致Abstract : degree of homogeneity is introduced, thereafter the magnetic field of helmholtz coil is studied, and the best conditions of this coil is investigated by computer
文摘:引入磁場均勻度的概念，對亥姆霍茲線圈磁場的均勻性進行了定量分析，並通過計算機模擬，得出了同一精度下，形成亥姆霍茲線圈均勻磁場的最佳條件The exhaust noise contains complex noise elements, including the exhaust noise with a base frequency measured in the number of exhausts in unit time, the resonance noise of the gas column in the pipe, the gas stream blowing noise at the exhaust manifold, the exhaust gas jetting and impact noise, the helmholtz resonance noise of the cylinder, the karman eddy noise and the turbulent noise inside the exhaust system
排氣噪聲包含了復雜的噪聲成分：以單位時間內排氣次數為基頻的排氣噪聲、管道內氣柱共振噪聲、排氣歧管處的氣流吹氣噪聲、廢氣噴注和沖擊噪聲、汽缸的亥姆霍茲共振噪聲、卡門渦流噪聲及排氣系統內部的湍流噪聲等。First of all, the algorithm base on the boundary problem of helmholtz equation and finite - difference technique, calculate the field in “ cold ” cavity and disperse the helmholtz equation, as a result of the formula : ax = x. secondly, according to the eigenvalue of matrix theory and applied iterative methods, eigenmode adopt a numerical approach which allows the improved chebyshev polynomial iteration which based on the power method to extract the isolated eigenmode in the spectrum. finally, we resolve the problem of compatibility in software and insert the eigenmode module into the chipic which will have the function of eigenmode analysis
具體的說: （ 1 ）首先以電磁理論中的亥姆霍茲方程的邊值問題理論和計算電磁學中的有限差分法為基礎，計算冷腔中的場分佈並離散亥姆霍茲方程，得到標準的本徵值問題: ax = x ; （ 2 ）然後根據矩陣理論中的eigenvalue問題和數值計算中的迭代方法，採用改進后的chebyshev多項式，在power迭代法的基礎上對ax = x進行多項式迭代，實現對頻譜中孤立本徵模的萃取; （ 3 ）最後將用fortran語言編制的eigenmode模塊加入到chipic軟體中，解決了eigenmode模塊與chipic主代碼的兼容問題，從而實現了chipic軟體的模式分析功能。The solving steps are as follows : the field is divided into three regions by the cylindrical surface of the finite - length cylinder and the location of the delta - coils. because " the surface current source is placed at the interface, the non - homogenous restricted equation on the magnetic vector potential is transformed into the homogenous helmholtz equation. by using the method of separation of variables to solve equation and according to the interface conditions and the condition at infinity to determine the unknown constants, the expressions for the magnetic vector potential of the three regions are solved out
在求解過程中，假定放置式圓柱線圈是由無窮多個對稱圓環線圈密饒而成，首先求解含有有限長磁芯的通電對稱圓環線圈的電磁場：以有限長圓柱磁芯的側面和圓環線圈所在圓柱面為分界面將場域劃分為三個小區域，由於場源放置在內邊界面上，使得關于矢量磁位的非齊次約束方程轉化成齊次亥姆霍茲方程，利用分離變量法求解，根據分界面鄭州大學碩十研究生畢業論文摘要條件以及無限遠條件確定待定常數，從而得到各場區矢量磁位的表達式。This thesis consists three sections : in section one, first and for most, the author intends to illuminate that the development of german physics was at a standstill for the whole 18th century by giving a profile on it before the year of 1800. then the author depicts the three - stages for german physical achievements from 1800 to 1930, namely ohm time ( 1800 - 1840 ), helmholtz time ( 1840 - 1880 ) and planck time ( 1880 - 1930 ), in which the author focuses on the outline of the development of german physics to represent the dynamic feature of the development of german physics
本論文共分三部分：第一部分，首先通過對1800年以前德國物理學發展的概述，說明德國物理學的發展在整個18世紀幾乎處于停滯狀態；然後對1800 1930年的德國物理學的主要成就分三個時期：歐姆時期（ 1800 1840 ） 、亥姆霍茲時期（ 1840 1880 ） 、普朗克時期（ 1880 - 1930 ）進行描述，突出德國物理學發展過程的主體脈絡，體現德國物理學發展的動態特徵。We regard every layer of grain as a lot of helmholtz resonators in parallel, and regard different layer of grains as the paralleling resonators in series. the grain is a combined resonator in series and parallel. based biot ' s theory of acoustic propagation in porous media this paper applies johnson ' s model to grain media
一定厚度的糧食可看作是一種組合式共振吸聲結構，每層認為由許多個單獨亥姆霍茲共振腔並聯而成，而層與層的共振腔為串聯關系，表現為共振性吸收，出現了共振吸收峰。The other kind of mechanism regards the grain as a combined resonator
另一種吸聲機理來自亥姆霍茲共振腔。Gibbs - helmhotz equation
亥姆霍茲方程Abstract : the distribution of axial magnetic field around the centre of helmholtz " coils has been thoroughly analyzed, a numerical method for estimation of the homogeneity of coils " magnetic field had been found, and the homogeneity curve is given
文摘:分析了亥姆霍茲線圈中心區域軸向磁場的分佈，找到了一種估計線圈磁場均勻區的計算方法，並給出了均勻區分佈曲線圖。分享友人