Magnetism-current inverse image reconstruction of the nugget in aluminum alloy spot welding based on ART algorithm

In this work, the computer tomography (CT) theory and its reconstruction algorithm were used to deal with the magnetism-current inverse problem in the resistance spot welding (RSW). At first, the magnetic fields around the nugget were detected. Then, the current distribution of the nugget section was calculated by reconstruction algorithm. At last, we changed the current distribution data into a graph using Matlab. The inversed graph of the nugget-section current distribution in the inverted RSW can be achieved, and by this graph the details of the nugget can be observed directly, which can help evaluate the joint quality.     

一种非均匀采样重构芯片热信号的方法

实时片上热信号是集成电路芯片动态热管理(DTM)的重要信息。提出了一种基于Voronoi图的非均匀采样重构芯片热信号的方法,该方法在16核的处理器上每核9个传感器的情况下给出了最小2.25%的平均误差,并且通过与距离倒数加权平均法的平均运行时间的对比验证了该种方法的优越性。     

Robust detection of a weak signal with redescending M‐estimators: A comparative study

On finite samples redescending M‐estimators outperform linear bounded Huber's M‐estimators. To provide stable detection of a weak signal of arbitrary shape, robust Neyman–Pearson detection rules based on redescending M‐estimators of location are introduced and studied. It is shown that, on the whole, robust detectors based on redescending M‐estimators outperform conventional Huber's linear bounded detectors rules under light‐ and heavy‐tailed noise distributions both on large and small samples. Copyright © 2009 John Wiley & Sons, Ltd.     

考虑非规则荷载下土体残余应变的时域积分方法

非规则荷载下土体残余应变发展模型是一个目前仍在探索的问题，现有的土层时域积分方法难以考虑土体的残余应变效应。阐述了一种在规则和非规则荷载下土体残余应变的表示方法，将其与双曲线型动态骨架曲线相结合，推导出一种能较好考虑非规则荷载下残余应变效应且方便程序实现的土体应力-应变关系。将此土体应力-应变关系应用于土层地震反应时域积分方法中，获得了一种考虑土体残余应变效应的时域积分方法，基于MATLAB平台编制了RS-DYMATLAB计算程序。利用实验数据对方法进行了验证，结果表明，本方法是一种合理可行的、能较好地考虑土体的残余应变效应的土层地震反应分析方法。     

The science of sex appeal: An evolutionary perspective.

Growing evidence shows that features we find attractive in members of the opposite sex signal important underlying dimensions of health and reproductive viability. It has been discovered that men with attractive faces have higher quality sperm, women with attractive bodies are more fertile, men and women with attractive voices lose their virginity sooner, men who spend more money than they earn have more sex partners, and lap dancers make more tips when they are in the fertile phase of their menstrual cycle. This paper highlights recent evidence showing that the way we perceive other people has been shaped by our evolutionary history. An evolutionary approach provides a powerful tool for understanding the consistency and diversity of mating preferences and behaviors across individuals and cultures. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Exact Lithologic Boundary Detection Based on Wavelet Transform Analysis and Real-Time Investigation of Facies Discontinuities Using Drilling Data

Abstract

Exact detection of lithologic boundaries is one of the main challenges in exploration, drilling operations, and geology. Investigation of facies discontinuities has been performed using petrophysical data regarding sharp changes along the wellbore. Due to the fact that recorded well logging signals contain lots of high-frequency waves (noise), detection of the layer boundaries comes with some uncertainties that should be eliminated by denoising those signals. Wavelet transform analysis is a good approach to denoise the signals and its ability has been proven in several studies. In this study, implementation of wavelet transform analysis resulted in an innovative approach for exact differentiation of neighborhood lithologic units.

Detection of boundaries between different layers, especially the ones in the vicinity of the reservoir during drilling operations, is one of the crucial issues in petroleum well engineering. This purpose is usually achieved by cutting analysis and geological maps, which are not accurate enough and may cause substantial problems. Unconfined rock compressive strength can be considered as an accurate criterion to detect geological boundaries. In this study, an artificial neural network (ANN) model is developed that can predict the unconfined rock compressive strength of formations being drilled by importing 10 drilling parameters as inputs. Because rock strength will experience sudden changes while entering the next layer, it can be used as a key parameter to determine boundaries.     

The Analysis of Frequency Reuse Irregular Patterns in Mobile Telephone Network

Some frequency reuse irregular patterns in radionetwork design are proposed,the characteristic and applica-tion measures of these patterns are analyzed.Then this paperaccounts that frequency reuse irregular patterns is a usefulway to impove spectrum efficiency and it is significative forartificial intelligence to be applied in this field.     

Adaptable Splatting for Irregular Volume Rendering

By employment of a footprint table in conducting intensity integration, splatting method has been very successful in rendering regular data volumes. Recently, the method has also been extended to render irregular data volumes. However, since samples in irregular volumes vary greatly in size and shape, the footprint table is unable to be employed in an efficient manner. This hinders the application of splatting approach from being used in the irregular volume case. In this paper, an adaptable splatting method is proposed, which provides an efficient way to integrate color intensity in terms of footprint table for the samples in various sizes. Experiments show that the new method may be used to produce better images without extra expense.     

振动台试验测试信号去噪的小波变换方法

本文利用小波变换下有效信号和随机噪声在多尺度空间中模极大值不同的传播特性，对地震模拟振努台试验测试信号进行去噪处理，取得良好效果。