The result shows that the mixed boundary condition can greatly reduce the calculation area without affecting accuracy of the solution.It is followed by the higher accuracy of Dirichlet boundary condition which makes the boundary error greater when measured points is near the boundary, so we must take a sufficiently large border region.The homogeneous boundary condition has relatively large error, but the use of non-triangle poles devices makes apparent resistivity calculation error become small, because of elimination of the effect on potential difference for the infinite boundary. In inversion, in order to save computing time, homogeneous boundary conditions are often used to perform finite element forward calculation.

結(jié)果表明国产精品更新在线观看，混合邊界條件精度最高乱伦黄色视频免费观看，可大大縮小求解區(qū)域而不影響計算精度，其次是Dirichlet邊界條件精度較高国产精品综合色区日韩，但測點越靠邊界誤差會越大网色网站大全cao，必須取足夠大的邊界區(qū)域，齊次邊界條件的誤差比較大国产一区鲁鲁在线视频免费播放，但如果采用非二極裝置老牛影视无码av一区，通過電位差計算得到的視電阻率，由于無窮遠邊界對電位差的影響基本消除一级黄色视频。，視電阻率計算誤差與混合邊界條件下的接近国产乱子精品的A片视频，在反演中，為了節(jié)省計算時間经典自拍视频欧美日韩在线观看网站，經(jīng)常使用齊次邊界條件進行有限元正演1024在线视频一区二区精99。

We have also presented the ω-circulant boundary condition and compared it with the helix boundary condition. Furthermore, we can also get another new boundary condition: the mixed boundary condition.

由此我們提出了ω循環(huán)型邊界條件并將其與普通循環(huán)型及螺旋型邊界條件作了分析和比較；進一步地国模精品一区，得到了一種新的邊界條件：混合型邊界條件91POPNY老北熟女。

Compared with the known results,the nonlinearity is allowed to change sign and is involved with the first-order derivative explicitly.In particular,the boundary condition includes the Dirichlet boundary condition and Robin boundary condition.

與現(xiàn)有工作相比，我們所考慮的動力方程不但非線性項可變號黄片欧美日韩一片二片三片，而且包含一階導(dǎo)數(shù)項九九色影院亚洲欧洲，所考慮的邊值條件更具一般性，比如可以包含Dirichlet及Robin邊值條件等国产一级性生活免费视频。

We can not apply Galerkin methods with radial basis functions to the first boundary value problem (the Dirichlet boundary value problem) of the second-order elliptic equation, because it requires that the approximate functions should fit the essential boundary condition, while the spaces spanned by the radial basis functions fails to satisfy this kind of boundary condition, and it is the same for the higher-order elliptic equation.

我們不能直接應(yīng)用這樣的無網(wǎng)格算法求解二階橢圓型方程的第一類邊值問題(Dirichlet邊值問題)黄色黄片，因為第一類邊界條件是本質(zhì)邊界條件(對二階橢圓型方程為Dirichlet邊界條件)，而徑向基函數(shù)的支集通常是全空間啦啦啦www观看在线下载，由它們所生成的近似函數(shù)空間一般不滿足這樣的條件人人欧美乱码专区视频免费。

Second order incident boundary condition on fixed incident boundary is derived for numerical simulations, based on the cnoidal or sinusoidal motions of wave maker paddle, which shows that the prediction with second order incident boundary condition is more accurate than the prediction with first order incident boundary condition. 2 The analytical solution for higher-order Boussinesq equations is derived and its applicable range is discussed. 3 A 2-D fully non-linear numerical model using boundary element method is developed to obtain wave forces acting on rectangular obstacle. 4 The three-dimensional fully non-linear waves are studied in a numerical wave tank using finite element method.The studies on the coupled numerical model combined Boussinesq equations with Laplace equation are following.

非耦合非線性波浪計算模型：1 根據(jù)造波板做橢圓余弦運動或正弦運動速度，推導(dǎo)出數(shù)值模擬波浪水槽時固定入射邊界上的二階波浪入射邊界條件久久中精品中文字幕入口，數(shù)值計算結(jié)果和實驗結(jié)果的對比表明采用二階入射邊界條件對波面升高的預(yù)報比采用一階入射邊界條件對波面升高的預(yù)報更為精確熟妇人妻激情系列；2 推導(dǎo)了波浪水槽造波板做正弦運動所產(chǎn)生波浪的高階Boussinesq方程攝動展開解析解淫秽视频网站在线观看，討論了該解析解的適用范圍；3 對整個波浪水槽應(yīng)用邊界元方法數(shù)值模擬了波浪對物體的非線性作用1024亚洲国产精品一区二区；4 用有限元法求解三維Laplace方程模擬了三維完全非線性波浪水槽人妻基地。

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work.Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted.

針對JEDEC標(biāo)準(zhǔn)試件的局限性，提出了設(shè)計便于統(tǒng)計學(xué)研究焊點可靠性的試驗試件的構(gòu)想甜蜜蜜手机在线观看，利用有限元模態(tài)分析方法確定并驗證了用圓形PCB組件替代JEDEC標(biāo)準(zhǔn)試件的可行性欧美又大又粗性视频；通過一系列模態(tài)試驗和有限元模態(tài)分析，確定了圓形PCB組件的相關(guān)試驗參數(shù)亚洲特a级黄片，這不僅為跌落碰撞下PCB組件有限元模擬確定了較為合理準(zhǔn)確的有限元模型禁止18随进入的网站，而且為正確地評價跌落碰撞下PCB組件的可靠性問題奠定了基礎(chǔ)。2黄色av免费在线播放。

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

針對JEDEC標(biāo)準(zhǔn)試件的局限性亚洲精品自拍AV在线日韩，提出了設(shè)計便于統(tǒng)計學(xué)研究焊點可靠性的試驗試件的構(gòu)想，利用有限元模態(tài)分析方法確定并驗證了用圓形PCB組件替代JEDEC標(biāo)準(zhǔn)試件的可行性影音先锋高清无码；通過一系列模態(tài)試驗和有限元模態(tài)分析国产黄色视频流畅在线免费，確定了圓形PCB組件的相關(guān)試驗參數(shù)，這不僅為跌落碰撞下PCB組件有限元模擬確定了較為合理準(zhǔn)確的有限元模型色色视频资源网站，而且為正確地評價跌落碰撞下PCB組件的可靠性問題奠定了基礎(chǔ)古装一级婬片A片AAA毛片。

Assign the Boundary conditions 5,設(shè)置邊界條件 A natural air cooling heat Boundary condition will be applied all around the sand box, a velocity Boundary condition will be applied and a temperature Boundary condition will be imposed to some nodes of the top surface of the down sprue.

砂型周圍是一個自然空氣冷卻的熱邊界條件。一個速度邊界條件和一個溫度邊界條件將被設(shè)置到直澆口的上平面的一些節(jié)點上欧美顶级黄片片一区二区。

Chapter 3 emphasizes on the case that the considered systems contain not only impulse but also time delay. We mainly investigate impulsive parabolic systems with time delay and neutral impulsive parabolic systems. Section 3.1 discusses the oscillation of impulsive parabolic systems with time delay under Robin boundary condition and obtains some useful criteria via first order impulsive differential inequalities with time delay. Section 3.2 studies the oscillation of neutral impulsive parabolic systems under Neumann boundary condition and Robin boundary condition, respectively, and obtains some sufficient conditions for oscillation and strong oscillation via first order neutral impulsive differential inequalities.

第三章針對于"脈沖"與"時滯"共存的復(fù)雜情形美女网站在线免费视频色。，仍采用反證法討論了含時滯的脈沖偏微分系統(tǒng)的振動理論，具體研究了脈沖時滯拋物系統(tǒng)和中立型脈沖時滯拋物系統(tǒng)2019A级毛片。3.1節(jié)考慮了脈沖時滯拋物系統(tǒng)的振動理論黄片ID久久，借助于一階脈沖時滯微分不等式的解的性質(zhì)，得到了滿足Robin邊界條件的脈沖時滯拋物系統(tǒng)的若干振動準(zhǔn)則一道本a级片；3.2節(jié)考慮了中立型脈沖時滯拋物系統(tǒng)的振動理論911亚洲精品国内自产麻豆，借助于一階中立型脈沖時滯微分不等式的解的性質(zhì)，分別給出了滿足Neumann邊界條件和Robin邊界條件的中立型脈沖時滯拋物系統(tǒng)的若干振動和強振動準(zhǔn)則一区国产在。

This method allows for a more accurate processing of boundary condition on the semiconductor layer in XLPE cable of stator winding than the standard finite element, so that the interlaminated issue of boundary condition on interface can be avoided. A general algorithm is applied to deal with both the Dirichlet and the periodic boundary condition in 2D or 3D magnetic field problem.

提出了用有限元法計算磁場問題時周期性邊界條件和第一類邊界條件的統(tǒng)一處理方法，利用該方法在不改變代數(shù)方程組階數(shù)欧美视频亚洲、保持系數(shù)矩陣性質(zhì)不變和帶寬基本不變的條件下亚洲精品在线观看视频免费，使兩種強加邊界條件能同時處理，簡化了程序編制人人草人人摸人人插，并與尋址方法相結(jié)合98国产视频，提高了計算速度。