利用信息融合方法的三维特征提取

本文提出了一种基于信息融合的物体三维特征的提取方法，该方法利用两幅互相配准的三维测距图像和灰度图像，来提取多面体的三维特征。首先，通过分析灰度图像中的灰度变化及测距图像中的测距值变化，分别求取各自图像中物体的特征点及特征边；然后，利用两配准图像之间的对应关系，求得所有特征点、面与多边形在三维测距图像中的三维表示；接着，通过分析三维测距图像中所测得的各候选平面上特定点与边处的曲率及法向，验证候选平面     

改性双马来酰亚胺的研究

本文研究了双马来酰亚胺与烯丙基化合物形成的改性树脂体系的固化和热性能，讨论了单体配比、增韧剂、催化剂对性能的影响。     

2-乙基己酸的制备

研究了 2乙基己酸的制备 ,该反应是 2乙基己醇与氢氧化钠在催化剂存在下进行氧化、脱氢 ,生成产物2乙基己酸。通过实验找到了一种新型、高效、廉价的催化剂 ,以及最佳反应条件。通过对 2乙基己酸的分析测试 ,产品完全符合质量标准。     

Outlier-resistant methods for estimation and model fitting

Least squares is perhaps the most widely used technique for model fitting. In this article, we illustrate the poor performance of least squares when there are spurious values, or outliers, in a sequence of measurements. A brief overview of three well-known classes of robust alternatives to the least-squares mean is presented. For robust regression, a recent proposal called least median squares (LMS) is decribed. LMS regression is compared to least-squares regression in an example involving the estimation of optical fiber geometry. References are provided for software that is available for robust estimation techniques surveyed in this article.     

两种超声清洗槽的声场分布比较

本文作者设计了一种斜底式超声清洗槽，并通过实验研究了它的声场分布，与平底式超声清洗槽相比，这种新型清洗槽深度方向的声场均匀性得么了改善，但水平方向的声场均匀性变化不大。     

Mechanical Model on Brittle Crack Initiation and Propagation

A mechanical model is presented in this paper to describe the initiating and propagating of brittle cracks. Two criteria have been deduced from the model to determine the effects of such factors as local stress state, surface and grain boundary energies as well as local grain boundary orientation on the initiating and propagating of both intergranular and transgranular brittle cracks. By which the role of adding B in Ni3Al base alloys to improve their ductility,temper and hydrogen embrittlements in steels and other alloys as well as the random feature of brittle crack initiation could be explained     

Position-sensitive superheated-liquid-droplet neutron dosimeter

The one-dimensional (1D) position-sensitive superheated-liquid-droplet dosimeter (SLDD) has been fabricated and tested in the laboratory. The 1D SLDD is fabricated from a 9.525-mm OD, 6.35-mm ID, 20-cm long, Plexiglas-walled tube filled with a mixture of superheated-liquid Freon droplets and host medium glycerol. Washer-shaped piezoelectric acoustic transducers are positioned at both ends of the tube; they determine the number and positions of the acoustic events when the superheated-liquid droplets evaporate upon neutron irradiation. The SLDD is irradiated with the ¹³⁷Cs and ⁶⁰Co γ-sources, as well as ²⁵²Cf neutron source to test for its radiation response and spatial resolution. The SLDD based on the Freon-134a superheated-liquid droplets operating at 20°C and 1 atm is found to be ideal for measuring absorbed neutron dose. This study also proves that the positions of the radiation-induced nucleation acoustic events can be linearly determined from the differences in the transmission times received by the acoustic transducers on the 1D SLDD. The spatial resolution of the neutron depth-dose is 1 mm due the finite response time (1 μs) of the piezoelectric acoustic transducers.     

人组织液医学超声空化阈值的研究

本文用荧光法检测医用理疗级连续波超声作用于人组织液（血清，血浆）发生空化产生的自由基，超声阈值强度ＩＳＡＴＡ（空间平均时间平均声强）分别为０．７５Ｗ／ｃｍ＾２～０．８５Ｗ／ｃｍ＾２和０．７Ｗ／ｃｍ＾２。本研究证明荧光法是检测医学超声空化的有效方法，并提供离体人组织液超声空化安全阈值的研究结果，同时发现人血清，人血浆空化的程度工化与声强相关关系不同。     

Cd-ZSM-5沸石催化剂的制备、表征和芳构化催化性能

采用离子交换、浸渍和混合三种方法制备镉改性ZSM-5沸石催化剂,考察了改性方法和镉含量对催化剂的表面酸性和Cd状态以及芳构化性能的影响。结果表明,加入镉降低了B酸性,Cd~(2+)与沸石结合形成了L_(1612)酸中心,其生成量取决于改性方法和Cd含量,并与芳构化活性提高有直接关系。     

APPLICATION OF COMPUTER NUMERICAL METHOD IN PORE STRUCTURE CALCULATION

This paper compares the results Of calculat-ing pore structure and graphing differential and integralpore size distribution by hand and Computer,and presents thatlagrangian interpolation uesd by calculating pore structure issuitable and reliable.