图像特征识别方法研究

图像特征识别的方法及其技术实现系当前模式识别研究领域中最为热门的研究课题之一。本文针对NMI(归一化转动惯量)特征识别、不变矩特征识别和比例特征识别三种图像特征识别方法．通过实验分析了该三种识别方法的缩放不变性、旋转不变性、平移不变性以及不同物体之间的特征差异。实验数据显示NMI特征识别方法具有最佳的识别效果和最快的处理速度。     

一种基于遗传算法优化的模糊控制器研究

模糊控制中的模糊推理规则和隶属函数的选取往往依据相关专家或技术人员的实际经验,具有较大的人为主观性,尤其在面对具有较强的非线性系统和未知动态环境条件下,其控制性能达不到客观要求。本文采用改进的遗传算法优化模糊控制中的比例因子,从而对控制规则和隶属函数进行优化。仿真结果表明,经过优化后的模糊控制器和传统的Fuzzy-PID控制器相比,其控制规则和隶属函数更加客观合理,控制系统的动、静态性能都有较大提高。     

Segment-Adaptive Spread Spectrum Audio Watermarking Using NSGA-Ⅱ

In the field of robust audio watermarking,how to seek a good trade-off between robustness and imperceptibility is challenging.The existing studies use the same embedding parameter for each part of the audio signal,which ignores that different parts may have different requirements for embedding parameters.In this work,the constraints on imperceptibility are first analysed.Then,we present a segment multi-objective optimization model of the scaling parameter under the constrained Signal-to-noise ratio (SNR) in Spread spectrum (SS)audio watermarking.Additionally,we adopt the Non-dominated sorting genetic algorithm Ⅱ (NSGA-Ⅱ) to solve the proposed model.Finally,we compare our algorithm(called SS-SNR-NSGA-Ⅱ) with the existing methods.The experimental results show that the proposed SS-SNR-NSGA-Ⅱ not only provides flexible choices for different application demands but also achieves more and better trade-offs between imperceptibility and robustness.     

a-C∶H/a-Se复合膜晶化分形凝聚的计算机模拟研究

本文基于红外透射及喇曼谱分析的结果提出了一个 a-C:H/a-Se 复合膜的 a-C∶H 层非平衡晶化凝聚模型,并做了计算机模拟研究。模拟得到的图形是具有良好的无标度性的链环状分形。其分维值为1.37±0.02,此结果得到了实验的肯定。这对非晶膜的结构及晶化机理的研究均富有价值。     

21世纪微电子芯片设计技术发展方向

文章主要阐述了21世纪微电子芯片技术及其发展的三个方向：1）遵照Moore定律和按比例缩小原理继续高速发展；2）系统芯片（SOC）；3）智能芯片，或赋予芯片更多的灵气。     

Scaling up the cold sintering process of ceramics

The cold sintering process (CSP) densifies ceramics below 300 °C by utilizing a transient phase and applied pressure. Although CSP has been employed for densifying a variety of functional systems, their structural integrity does not always reach that of conventionally sintered parts. On the example of ZnO, this study aims to eliminate processing-induced defects that compromise the strength of cold sintered materials. Ultrasonic evaluation was employed for nondestructive detection of flaws prior to mechanical testing. Load transfer misalignments and fast heating rates were found as major sources of defects, impairing the mechanical strength. Based on these findings, multiple disc-shaped samples (13 mm diameter and ∼1.3 mm thickness) were cold sintered simultaneously using precisely aligned punches and slow heating rates. The obtained homogeneous densification, high relative density (>97%) and relatively high strength (∼120 MPa), i.e. two times superior to previously reported values, demonstrates the feasibility of scaling up the CSP towards industrial implementation.     

A superlinear Scaling Factor Regula Falsi root finder that detects the simple or multiple character of the root

In this work a new method of Scaling Factor Regula Falsi type is developed, by using parabolic interpolation. It has global convergence and a high computational efficiency for simple roots. The method, not being a hybrid one, allows changing the function used for calculating the scaling factor at every iteration, making possible to switch to other more adequate methods for multiple roots (e.g., a generalised Illinois one). As an important feature of the method, it allows determining with no additional calculations, whether the root is simple or multiple. The developed algorithm has been tested with numerous functions extracted from the bibliography, performing, in most cases, better than some routines (like brentq, brenth and toms748) found in common numerical libraries. Fully operative routines of the new method are provided as supplementary files in four different programming languages: python, lua, C and Fortran90.     

An analytical model for the velocity and gas fraction profiles near gas-evolving electrodes

Understanding multiphase flow close to the electrode surface is crucial to the design of electrolyzers, such as alkaline water electrolyzers for the production of green hydrogen. Vertical electrodes develop a narrow gas plume near their surface. We apply the integral method to the mixture model. Considering both exponentially varying and step-function gas fraction profiles, we derive analytical relations for plume thickness, velocity profile, and gas fraction near the electrode as a function of height and current density. We verify these analytical relations with the numerical solutions obtained using two-dimensional mixture model simulations. We find that for low gas fractions, the plume thickness decreases with an increase in current density for an exponentially varying gas fraction profile. In contrast, the plume thickness increases with increasing current density at high gas fractions for an approximately step-function-shaped gas fraction profile, in agreement with experiments from the literature.     

An energy‐aware scheduling algorithm for divisible loads in a bus network

The schedule of divisible loads is one of the most typical problems in the research and application of parallel and distributed systems. For these large‐scale systems, the energy consumption problem has drawn great attention in recent years because of falling hardware costs and the growing concern of energy costs. In computing‐intensive systems, energy is primarily consumed by CPUs, and dynamic voltage‐frequency scaling technology is capable of adjusting CPUs' speed as well as saving energy. In this paper, we focus on computing‐intensive applications and study the energy‐aware scheduling problem for divisible loads in a bus network. The energy‐speed model is introduced to characterize the problem based on dynamic voltage scaling, and the energy‐aware scheduling problem is analyzed in the application layer above the operating system. The problem can be formulated mathematically as a nonlinear programming problem, and the solution is achieved using the Lagrange multiplier method under Kuhn–Tucker conditions. Based on the analytical results, an energy‐aware scheduling scheme called ENERG for divisible loads is presented. Finally, the energy‐aware scheme is compared with two other schemes to show the effectiveness and efficiency of the energy savings of our algorithm. Additionally, the experimental results illustrate the influence of network transmission delay on energy consumption. Copyright © 2015 John Wiley & Sons, Ltd.     

膦基丙烯酸-马来酸酐共聚物阻垢剂ZPS-01的合成及阻垢性能

合成了膦基丙烯酸－马来酸共聚物阻垢剂ＺＰＳ－０１。最佳工艺条件为：ＡＡ、ＭＡ摩尔比７５：２５，次磷酸盐２０％，引发剂１０％，反应时间４ｈ，反应温度９０℃，静态阻垢性能测试结果表明，ＺＰＳ－０１用作油田污水的阻垢剂，综合性能优于常用阻垢剂ＨＥＤＰ。