查询词典 second boundary value problem

In this paper,we consider the existence and uniquness of solution for Dirichlet problem of the Helmholtz equation on the domain with corners, i.e problemFor smooth boundary,we use potential theory to transform the problem into second kind boundary integral equation ,and use Fredholm alternative theorem,we obtain the existence and uniqueness of Dirichlet problem.

在本文中，我们考虑边界含尖点的有界区域上Helmholtz方程△u+k~2u=0的Dirichlet问题即问题与问题解的存在及唯一性。

There is no difficulty for us to solve N-K problem for submerged bodies by the coupled element method, but for wavemaking problems of the bodies piercing free surface, we get a difficult problem of line integral on the free surface when we solve the boundary value problem in the external region by boundary element method.

对于深潜物体的N—K问题，用耦合元方法求解不存在根本性的困难，但对于水面船波兴波问题，采用边界元方法来处理外域中的边值问题而出现了所谓的自由面线积分问题。

The gap element method is proposed in the paper for two kinds of problems, which include contact problem and gap joint problem. Elasticity contact problem falls into the category of unknown boundary value problems. It follows that the contact area and contact conditions or states can never be determined without special mathematical analysis, which is a very difficult work. The boundary conditions of the contact surfaces are deduced.

文中给出了间隙元法在空间可动部件接触问题中的应用，推导了其几何边界条件和力学边界条件，利用虚功原理推导了含间隙元弹性接触问题的有限元方程式，给出了其数值解法的迭代步骤，并指出了利用间隙单元进行分析的特点。

The main purpose of this dissertation is to study the steady state problem,periodic-boundary value problem and initial value problem of Lazer-Mckenna sus-pension bridge equation and other some relevant problem.

本文研究Lazer-Mckenna吊桥方程的静态问题，周期边值问题和初值问题以及一些类似的相关问题。

Mao Zedong has discussed confiscation of bureaucratic capital , has built the socialist state owned economy problem on depending on the socialist society pattern of ownership and assigning the system problem,have discussed the problem reforming individual economy becoming socialism collective economy , have discussed the problem reforming private capitalistic economy becoming socialist state owned economy , have discussed appropriate develop individual economy and private economy and the problem introducing foreign investment, possessions having discussed "three-level of rural collective economy, team the problem being a basis ", have discussed the problem needing to pay attention to the interests of the collective and the individual as well as the state, Have discussed the problem persisting in distributing according to ones performance , opposing an equalitarianism.

在社会主义社会的所有制结构和分配制度问题上，毛泽东论述了没收官僚资本、建立社会主义国营经济的问题，论述了把个体经济改造成社会主义集体经济的问题，论述了把私人资本主义经济改造成社会主义国营经济的问题，论述了适当发展个体经济和私营经济以及引进国外投资的问题，论述了农村集体经济的"三级所有，队为基础"的问题，论述了要兼顾国家、集体、个人三者利益的问题，论述了坚持按劳分配、反对平均主义的问题。

Outlined in the Beijing Olympic Games, at 13:30 on August 13 Switzerland and France than was Ankan Qiela La Road Cycling Championship. Ankan Qiela La France in the World Championships: 2004 Bardolino, Italy was eighth, 2005 Madrid, Spain, was third, 2006 Salzburg, Austria received first place in 2007 at Stuttgart, Germany was the first ; France 2005 cycling sai Laise Skopje was seventh; Flanders Cycling Grand Prix E3 second place; Belgium Harelbeke 2007 Road Cycling sai second place; Florence - Bicycle sai Pistoia, Italy Paper 2004 Si Tuoya fourth; Ghent - Victoria Buddhist roots bike sai fourth; Road Cycling Events, the Belgian peacekeepers Buddhist roots fourth in 2006 Belgian peacekeepers were sixth Buddhist roots; HEW Classic Bicycle Germany 2005 Hamburg Road Cycling sai fourth in the 2006 German Beer, Luke second Challenge; Milan - San Remo Road Cycling sai second place; San Remo, Italy, the 2008 Road Cycling sai was the first; Monte Siena, Italy 2008 Paschi Eroica Road Cycling sai was the first Swiss national championships, in 2008 Switzerland was the first Messen; Stettlen 2007 Switzerland was the first in 2006 was the first Ruishiboning root 2005 Switzerland was the first Hagendorn; Highway Cycling Merit 2007 Rui Shibu Kruger was second in Paris - Roubaix bicycle sai , 2006 France was the first Roubaix; Roubaix France was second in 2008; 2005 Roubaix France was eighth; Denmark Post bike sai The 2006 final ranking was the first Danish Frederiksberg; ring The 2006 Belgian Flanders Cycling Road Cycling sai Meerbeke was sixth; Etruscan - Adriatic bike sai , 2008 Italy's Benetton and child care - Badelt-care was the first in the Central bike sai Luxembourg, Luxembourg Central Di Jixi 2005, was second; bike sai Central California, the United States in 2008 in Pasadena, California, was fourth ; Athens, Greece in 2004 was the 10th individual time trial; Olympics

瑞士法比安坎切拉拉在世界锦标赛：2004 意大利巴多利诺上获得第八名，2005 西班牙马德里上获得第三名，2006 奥地利萨尔茨堡上获得第一名，2007 德国斯图加特上获得第一名；2005 法国莱塞比耶自行车赛获得第七名；佛兰德E3自行车大奖赛获得第二名；2007 比利时哈勒尔贝克公路自行车赛获得第二名；佛罗伦萨-皮斯托亚自行车赛，2004 意大利皮斯托亚获得第四名；根特-维佛根自行车赛获得第四名；公路自行车赛 2005 比利时维佛根获得第四名；2006 比利时维佛根获得第六名；HEW自行车经典赛 2005 德国汉堡公路自行车赛第四名；2006 德国比尔，路克挑战赛第二名；米兰-圣雷莫公路自行车赛获得第二名；2008 意大利圣雷莫公路自行车赛获得第一名；2008 意大利锡耶纳 Monte Paschi Eroica 公路自行车赛获得第一名；瑞士全国锦标赛，在2008 瑞士Messen 获得第一名；2007 瑞士Stettlen 获得第一名；2006 瑞士伯宁根获得第一名；2005 瑞士Hagendorn获得第一名；公路自行车赛 2007 瑞士布鲁格获得第二名；巴黎-鲁贝自行车赛，2006 法国鲁贝获得第一名；2008 法国鲁贝获得第二名；2005 法国鲁贝获得第八名；丹麦邮政自行车赛决赛排名赛 2006 丹麦腓特烈斯贝获得第一名；环佛兰德自行车赛 2006 比利时Meerbeke 公路自行车赛获得第六名；伊特鲁里亚-亚得里亚海自行车赛，2008 意大利圣贝内代托-德尔特龙托获得第一名；在环卢森堡自行车赛，2005 环卢森堡迪基希，获得第二名；环加利福尼亚自行车赛，在2008 美国加利福尼亚帕萨迪纳，获得第四名；2004 希腊雅典个人计时赛获得第十名；奥运会 2008 北京奥运会男子公路个人赛季军。

Aiming at this problem, the concept of the second order power spectrum was proposed based on the characteristic of the amplitude tune with periodical notch spectrum in thin layer and theoretically researched. The corresponding relationship between the thickness of thin layers and the maximum value of second order power spectrum was established. The theoretical criteria and method for the thickness estimation by second order power spectrum were given. The second order power spectrum map is made by the energy relationship between the thickness of thin layers and the second order power spectrum, and the time responding to strong energy on the map is the time of thin layer.

为此，从薄层振幅调谐具有周期性陷频谱特征出发，提出了二阶功率谱的概念，从理论上对薄层的二阶功率谱特征进行了研究，建立了薄层厚度与二阶功率谱极大值之间的对应关系，给出了利用二阶功率谱进行薄层厚度预测的理论依据和方法，即根据薄层厚度和二阶功率谱的能量关系制作二阶功率谱图，图上强能量团对应的时间即为薄层时间厚度。

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.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。2。

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.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

First mostly contraposing hull deck structure it goes along FEA analysis, discuss the different influence degree of calculational results between the different simplifications of the mathematical model, thereinto mostly analyse five different simplifications of the deck model; Second contraposing hold section and hull deck structure it goes along FEA analysis together, discuss the different influence degree of calculational results between the different elements style, gridding number and gridding density, thereinto mostly analyse the difference between adopting 8 node shell element and 4 node shell element, nondense gridding and thick gridding, and numerous gridding number and few gridding number, In the end mostly contraposing hold section structure it goes along FEA analysis, discuss the different influence degree of calculational results between the different boundary conditions, thereinto mostly analyse the difference between adopting CCS boundary conditions and LR boundary conditions.

首先主要针对船体甲板结构进行分析研究，讨论结构简化不同对有限元计算结果的影响程度，其中主要研究分析了五种不同甲板结构简化模型；紧接着针对舱段与甲板结构一起进行分析研究，讨论单元类型，网格数量与密度的不同对有限元计算结果的影响程度，其中主要研究分析了分别采用8节点板壳单元与4节点板壳单元的不同，以及分别采用疏的网格与密的网格，多的网格数量与少的网格数量的计算结果的差异。最后主要针对舱段模型进行分析研究，讨论不同的边界条件对有限元计算结果的影响程度，其中主要研究分析了分别采用CCS舱段边界条件与LR舱段边界条件进行有限元计算而带来的结果上的差异。本文第二部分为港工建筑物中的大直径薄壁圆筒结构的有限元比较分析。在研究大圆筒的有限元比较分析中，主要讨论用不同的网格密度与数量来划分网格引起的差异。其中用了网格密，数量多与网格疏，数量少两种模型进行大圆筒结构的有限元分析对比

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。