Impulse radar evaluation of concrete, asphalt and waterproofingmembrane

Impulse radar has proved to be effective in the nondestructive testing of bridge decks composed of layers of dielectric materials such as asphalt, waterproofing membrane, and reinforced concrete. In this work, the waveform reflected from these materials are modeled and analyzed theoretically. The relative dielectric constants are measured using sample blocks, and the reflected radar waveform are related to the actual physical structures. It is found that asphalt thickness and cover over reinforcement can be accurately determined     

A simultaneous assignment methodology of right/left eigenstructures

In the sense of eigenstructure (eigenvalues/eigenvectors) assignment, the effectiveness and disturbance suppressibility of a controller are mainly dependent on the left eigenstructure (eigenvalues/left eigenvectors) of a system. However, the disturbance decouplability is governed by the right eigenstructure (eigenvalues/right eigenvectors) of the system. In order to obtain a disturbance decouplable as well as effective and disturbance suppressible controller, a simultaneous assignment methodology of the right and left eigenstructures is proposed. The biorthogonality property between the left and right modal matrices of a system as well as the relations between the achievable right modal matrix and states selection matrices are used to develop the methodology. The proposed simultaneous eigenstructures assignment methodology guarantees that the desired eigenvalues are achieved exactly and the desired left and right eigenvectors are assigned to the best possible(achievable) sets of eigenvectors in the least square sense, respectively. An L-1011 flight control application is presented to illustrate the usefulness of the proposed methodology     

“集成手工艺”引入首饰制造以改进产品质量和生产工序(英文)

本文尝试找出了劳动密集产品（ｌａｂｏｕｒ－ｉｎｔｅｎｓｉｖｅｐｒｏｄｕｃｔ）在制造过程中质量下降递减（ｇｒａｄｕｒａｌｌｏｓｓｏｆｑｕａｌｉｔｙ）所存在的问题。这些问题存在以下两方面：（１）手工艺（ｃｒａｆｔｓｍａｎｓｈｉｐ）：由制办至最后的制成产品，首饰制造仍然非常依赖工匠的手工艺水平，产品质量受手工艺水平影响；（２）劳动分工（ｔｅｃｈｎｉｃａｌｄｉｖｉｓｉｏｎｏｆｌａｂｏｕｒ）的基本条件的框定和束缚：批量生产的工序流程中，产品质量未能保持（或达致）原首办的质量水平及设定的规格。这些问题可以通过产品设计去解决，把集成手工艺（ｉｎｔｅｇｒａｔｅｄｃｒａｆｔｓｍａｎｓｈｉｐ）概念融入全面优质管理（ｔｏｔａｌｑｕａｌｉｔｙｍａｎ－ａｇｅｍｅｎｔ）的思想。在制造过程中，把传统的手工艺的优值和观念提升为改进产品质量（其中一种）重要的工具或方法，另一方面采用集成手工艺概念来建立基础要素和方案，防止产品质量在工序中递减下降。本文旨在重新确认手工艺研究的重要性，强调设计可用来全面提高产品质量及竞争力。