基于ARM的嵌入式Linux交叉编译环境的研究与实现

构建交叉编译环境是嵌入式系统开发的基础,嵌入式开发的任何可执行程序都要使用交叉编译生成。文章详细介绍了如何构建一套基于arm的嵌入式Linux交叉编译环境,通过仿真实验测试表明,能够使用x86平台的交叉编译工具开发ARM平台上运行的程序,具有可靠的稳定性。     

计算机仿真在高频电子线路教学中的应用

针对传统高频电子线路教学中存在的问题,提出在教学中引入计算仿真进行辅助分析与设计．阐述了Multisim的主要功能与特点,并利用Multisim对高频电路中的典型电路单调谐回路谐振放大器、环形调幅器进行了仿真,各项结果与理论推导相符．形象、生动的演示达到提高学生学习兴趣的效果．     

驾驶员的责任意识与行车安全的探讨

责任意识,不仅是一个多学科、多领域共同关注的社会性问题,也是一个可以从多个视角审视、多种认知逻辑考量的复杂性问题。对驾驶员的责任行为、责任认知、责任情感的培养,对责任归因、责任意识发展进行实验研究,与道路交通安全都有着非常重要的关系。     

数字信号处理实验教学改革与探索

数字信号处理是通信专业实验性较强的一门课程.本文分析了数字信号处理实验教学的特点,完善了实验教学内容,并结合某校数字信号处理实验教学的现状,针对实验教学过程中存在的问题提出了解决方案.该方案产生了良好的实验教学效果,提高了学生的学习兴趣,培养了学生的自学能力以及分析问题和解决问题的能力.     

基于平面矢量场的可视化方法的研究

平面矢量场可视化是科学计算可视化的重要研究内容。矢量场以直观的图形图像显示场的运动,透过抽象数据有效洞察其内涵本质和变化规律,广泛应用于计算流体力学、航空动力学、大气物理和气象分析等领域。对平面矢量场进行可视化的方法有很多种,常见的有点图标法、流线法、线积分卷积法和拓扑分析法等。论文主要研究常见的可视化方法,分析它们的性能,并通过实际的例子,对具体的可视化结果图像进行比较。通过该研究,能够给人们在选择可视化方法时提供依据。     

一种彩色图像去噪的快速PGF滤波算法

提出了一种去除彩色图像噪声的快速PGF滤波算法.首先介绍了基本的PGF滤波算法,然后在分析PGF滤波算法的基础上,提出了一种简化的PGF滤波算法.最后,对该算法进行了仿真研究,仿真结果表明该算法在完成图像的噪声平滑和边缘保持的同时实现了图像的快速滤波.     

倒向P-推理与内P-属性类特征

P-推理(packet reasoning)是由P-集合(packet sets)的结构与动态特征得到的。P-推理由内P-推理(internalpacket reasoning)与外P-推理(outer packet reasoning)构成,具有动态特性与"序"特性。对P-推理进行"反序"研究,得到倒向P-推理(backward packet reasoning)。倒向P-推理由倒向内P-推理(backward internal packet reasoning)和倒向外P-推理(backward outer packet reasoning)构成。倒向P-推理的特征是:利用推理条件中集合的变化,在推理结论中找到变化的属性集合。利用倒向P-推理,给出P-属性类、P-属性类特征、P-属性类发现-辨识以及P-属性类在信息系统中的应用。     

关于假设检验的一种合理推导

鉴于假设检验在统计推断中的重要地位和学习它的困难度,通过讨论两类错误的产生与控制,结合概率论中的"小概率原理"和逻辑方法中的"反证法",给出了一种清晰简便的假设检验推导和推理方法。该方法适用于一个总体下总体均值、总体比例、总体方差的检验,也适用于两个个总体下总体均值、总体比例、总体方差的检验。检验结果表明,该推理方法简便、自然、适宜推广。     

Synthesis,crystal structures and cytotoxic activity of mononuclear nickel(II) and dinuclear zinc(II) complexes with ligand derived from S-benzyldithiocarbazate

Ni(L)₂ (1) and Zn₂(μ-OL)₂(L)₂ (2), (HL = S-benzyl-β-N-(2-bromobenzylidene) dithiocarbazate), were synthesized and characterized by elemental analysis and X-ray single-crystal diffraction analysis. 1 is a mononuclear neutral nickel(II) complex and the center nickel atom is chelated by donors of N₂S₂ possessing a distorted tetrahedral configuration, while in 2, the adjacent two complex molecules are linked through two O atoms to form a dimer and the center zinc atom is five-coordinate in a distorted trigonal–bipyramidal geometry. The cytotoxic activity study indicated that 2 showed potent cytotoxic activity against the human liver hepatocellular carcinoma (HepG2) cancer cell lines, with IC₅₀ 2.4 ± 0.2 μg·mL^− 1, which is slightly weaker than 5-fluoroacil (5-FU) (0.89 ± 0.21 μg·mL^− 1) as reference. A gel electrophoresis assay demonstrated the ability of the complex to cleave the pBR322 plasmid DNA.     

Nonlinear behavior of shear deficient RC beams strengthened with near surface mounted glass fiber reinforcement under cyclic loading

The aim of this investigation is to evaluate experimentally and numerically the cyclic loading response of reinforced concrete (RC) beams strengthened in shear with Glass Fiber Reinforced Polymer (GFRP) rods using the near surface mounted (NSM) technique. The experimental results indicated that the use of GFRP rods as NSM strengthening systems can significantly enhance the overall capacity and ductility of shear deficient RC members when subjected to cyclic loading. In particular, the increase in the load-carrying capacity of the strengthened specimens over the unstrengthened control specimen was in the range of 49–66%. Furthermore, the increase in the displacement over the control specimen ranged between 112% and 172%. A 3D finite element (FE) model was also developed to simulate the response of the tested specimens. The developed FE model integrates multiple simulation techniques, nonlinear material properties and corresponding constitutive laws. The models incorporate concrete cracking, yielding of steel reinforcement, bond–slip behavior between NSM reinforcement and adhesive material and between steel reinforcement and adjacent concrete material, respectively. The load–deflection response envelopes and the load–deflection hysteresis loops of the experimentally tested beams and those simulated by the FE models were compared. Good matching was observed between the predicted and measured results at all stages of cyclic loading.