Topics which are extensively developed or overhauled from the fourth edition include sound propagation outdoors, amplitude modulation, hearing protection, frequency analysis, muffling devices (including 4-pole analysis and self noise), sound transmission through partitions, finite element analysis, statistical energy analysis and transportation noise. For those who are already well versed in the art and science of noise control, the book will provide an extremely useful reference. A wide range of example problems that are linked to noise control practice are available on www.causalsystems.com for free download.

工程科技在线数据库(Engineering.pptx

现代声学科学与技术丛书·工程噪声控制：理论和实践（第4版） [Engineering Noise Control:Theory and Practice (Fourth Edition)]

In the development of the basic stress equations for tension, compression, bending, and torsion, it was assumed that no geometric irregularities occurred in the member under consideration. But it is quite difficult to design a machine without permitting some changes in the cross sections of the members. Rotating shafts must have shoulders designed on them so that the bearings can be properly seated and so that they will take thrust loads; and the shafts must have key slots machined into them for securing pulleys and gears. A bolt has a head on one end and screw threads on the other end, both of which account for abrupt changes in the cross section. Other parts require holes, oil grooves, and notches of various kinds. Any discontinuity in a machine part alters the stress distribution in the neighborhood of the discontinuity so that the elementary stress equations no longer describe the state of stress in the part at these locations. Such discontinuities are called stress raisers, and the regions in which they occur are called areas of stress concentration. Stress concentrations can also arise from some irregularity not inherent in the member, such as tool marks, holes, notches, grooves, or threads. 1 in T 18 in Figure 3–28 The cross-section of a thin strip of steel subjected to a torsional moment T. bud29281_ch03_071-146.qxd 11/24/09 3:02PM Page 110 ntt 203:MHDQ196:bud29281:0073529281:bud29281_pagefiles: Load and Stress Analysis 111 A theoretical, or geometric, stress-concentration factor Kt or Kts is used to relate the actual maximum stress at the discontinuity to the nominal stress. The factors are defined by the equations K t = σ max σ0 K ts = τ max τ0 (3–48) where Kt is used for normal stresses and Kts for shear stresses. The nominal stress σ0 or τ0 is the stress calculated by using the elementary stress equations and the net area, or net cross section. Sometimes the gross cross section is used instead, and so it is always wise to double check the source of Kt or

matlab终止以下代码生物医学工程 该存储库包含在2018-2019Spring在塞萨洛尼基的亚里斯多德大学电气与计算机工程学院教授的课程“生物医学技术”。 该项目是用MATLAB编写的。 该项目的目标是从EEG（脑电图）信号中进行尖峰分析和识别。 首先实现了一种尖峰识别方法。 然后进行特征提取，以便对代表特定神经元活动的峰值进行分类。 甲部 阈值方法通常用于检测经过300-3000Hz带宽滤波的细胞外记录的峰。 更具体地，使用宽度阈值，如果信号活性在附近超过阈值threshold的值，则检测该信号活性并将其记录为峰值。 问题_1_1 依次加载8个Data_Test_i.mat文件（i = 1，…，8），并为每个文件获取前10,000个样本。 然后绘制它们的图。 我们观察到，当我们继续进行下一个采样时，噪声会增加。 尖峰计数器： 阈值方法通常用于检测经过300-3000Hz带宽滤波的细胞外记录的峰。 更具体地，使用幅度阈值，检测信号活动并将其记录为尖峰，其中在附近它超过阈值

敏捷系统工程，Douglass博士的大作，2016年的新书。Douglass presents a vision of systems engineering in which precise specification of requirements, structure and behavior fuse with larger concerns, such as safety, security, reliability and performance in an agile engineering context.

作者 章毓晋 第2版 + 第3版 上、中、下册 全面介绍图像工程的第一层次——图象处理，图像工程的第二层次——图像分析，图像工程的第三层次——图像理解的基本概念、基本原理、典型方法、实用技术以及国际上有关研究的新成果。

国外经典教科书系列 光学 里面有详尽的实例，可配合Zemax软件进行学习

这是一本由Warren J. Smith主编的有关光学系统设计的专业书籍，内容丰富，涵盖了光学基础知识，各种典型光学系统设计知识，相信对光学专业人士有用。

猫地图 安装 点/setup.py CatMap可以通过pip直接安装： pip install --upgrade https://github.com/SUNCAT-Center/catmap/zipball/master 或下载/克隆存储库并运行 python setup.py install 从存储库根文件夹开始。 通过附加路径 要使用该软件包，请将该目录添加到PYTHONPATH中，例如在bash shell中： export PYTHONPATH=$HOME/THIS_FOLDER_PATH:$PYTHONPATH 或在cshell中： setenv PYTHONPATH $HOME/THIS_FOLDER_PATH:$PYTHONPATH 您将需要确保您正在运行python 2.5或更高版本，并且已安装了mpmath，numpy，scipy，ase和matpl