Scattering of plane SH-waves on semi-canyon topography of arbitrary shape with linging in anisotropic media

I.IntroductionItisofgreattheoreticalandpracticalimportancetostudytheproblemofscatteringofSH-wavesonsemi-canyontopographyofarbitraryshapewithlining.Especiallyinengineeringpractice,itisofgrePthelptotechnicians'analysisanddesignoftheanti-seismicstructureoftu…     

Analysis of adhesive lap joint

This paper is to solve the interlaminar stresses of adhesive lap joint by the energy method without considering the adhesive layer. The joint is made of two identical narrow plates. Two cases are discussed: one is for the isotropic material and the other is for orthotropic material. Because of the different materials forming the joint, the length of distribution and the magnitude of the interlaminar, stresses for the two cases will be very different.Projects supported by the Science Fund of Chines Academy of Sciences (1986–1988).     

浙江磐安尖山地区旅游资源特征与开发探讨

浙江磐安尖山地区旅游资源丰富，有待开发的旅游资源主要包括火山岩峡谷、多级瀑潭组合、高山飞瀑、皇城湖、破火山口、玄武岩台地、生态旅游资源，工业旅游资源、人文史迹和宗教寺庙等10个方面。可划分成皇城湖、夹溪、胡宅和鞍顶山4个景区，尖山地区的旅游资源要统筹规划，全方位、高标准开发，提高科学文化品位，并且纳入周边大旅游圈中。     

Scattering of SH-waves on triangular hill joined by semi-cylindrical canyon

Scattering of SH-waves on the triangular hill joined by semi-cylindrical canyon in half-space is studied using the method of complex function and moving coordinates. The model being studied is divided into two domains. The wave functions satisfying the required condition at each wedge are constructed in each equation. The equations are solved with Fourier expansion. Numerical results are provided to discuss the influence of scattering of SH-waves.     

多水平成层的非均匀介质圆弧形峡谷地下多点地震动模拟

开发了考虑圆弧场地水平多分层效应的地下多点地震动模拟可视化程序,验证其可靠性。首先,描述了给出的圆弧场地多分层效应的SH波动散射频域解,其本质是突破了传统均匀介质和分层不穿越峡谷前提的局限性;其次,利用从水平地表到峡谷表面再到地下土层的传递函数,通过两次传递得到了圆弧峡谷地下的目标功率谱和反应谱;进而,具体描述所导出的圆弧场地平-凹相关性的相干函数及其推导过程;最后,基于上述理论,开发了多层状的非均匀圆弧场地的多点地震动模拟程序,给出了模拟结果与目标功率谱、反应谱和相干函数的拟合对比,验证了该理论和程序的合理性和可靠性,便于所发展理论和方法的实用化和推广。     

高压脉冲电场保鲜技术中两半圆柱面形电极的电场分布

高压脉冲电场保鲜技术是利用强电场进行杀菌，可以在不破坏食品的营养结构与原有风味的基础上起到杀菌保鲜作用．实验表明，杀菌的效果与电场有关，本文求出了两半圆柱面形电极间的场强分布，对实验将具有指导作用。     

Noise levels on the shielded side in cities using a flat city model

The prediction of road traffic noise levels in areas not directly exposed, such as areas behind buildings and courtyards, is difficult using standardised methods. This is mainly due to the fact that traditionally only one or a few sources are included. Here a simple model that assumes a flat city on rigid ground is used to demonstrate that sources from a large area are important. Calculations are compared to measurements for four cases, and the proposed method predicts levels 6-10 dB too high for the equivalent level at all measurement positions. If a correction is applied for this over-estimation, the results agree well.     

Macroscopic modeling of urban traffic noise - influence of absorption and vehicle flow distribution

Prediction of noise levels at shielded positions in urban areas is more difficult than on exposed positions. At shielded positions, the predictions method must include multiple reflections, and many sources must be taken into account. Using numerical methods that solve the wave equation is possible, but very computationally heavy. Here two methods have been used, a very simplified ray model and a statistical model. The results show that concentrating the traffic and introducing absorption onto building façades will give lower levels at shielded positions.     

Scattering of plane SH-waves on cylindrical canyon of arbitrary shape in anisotropic media

The complex function method is used to solve problems of scattering of plane SH-waves on cylindrical canyon topography of arbitrary shape in anisotropic media. This paper gives the complete function series and general expressions with boundary condition to approach the solution of steady state scattering of plane SH-waves on two-dimensional canyon topography in anisotropic media. The problem to be solved can be reduced to a solution of infinite algebraic equation series by using Hermite function and it's orthogonal conditions. The solution can be obtained directly by using computers. Finally, as an example, computational results of scattering of plane SH-waves on a semi-cylindrical canyon topography are presented. The projects sponsored by The Joint Seismological Science Foundation.     

浅埋圆形孔洞附近的半圆形凸起对SH波的散射

采用"契合"的思想，给出了地下孔洞与地面上的半圆形凸起地形对SH波散射问题的 解答. 将整个求解区域分割成两部分来处理. 其一为包括半圆形凸起地形在内的一个圆形区 域I，其余为区域II. 在区域I和II中分别构造位移解，并在两个区域的"公共边界"上 实施"契合". 在区域I中构造一个上半部边界应力为零，而其余部分位移、应力任意的驻 波解，在区域II中构造出半圆形凹陷和浅埋圆孔的散射波，且要求它满足水平界面上应力 为零的约束条件. 然后再通过移动坐标，满足"公共边界"的"契合"条件和地下孔洞的边 界条件，建立起求解该问题的无穷代数方程组. 最后，给出了分析例题和数值结果，并 对其进行了讨论.