What are the differences between an LES-SGS model and a RANS based turbulence model?

The biggest difference between LES and RANS is that, contrary to LES, RANS assumes that \(\overline{u'_i} = 0\) (see the Reynolds-averaged Navier–Stokes equations). In LES the filter is spatially based and acts to reduce the amplitude of the scales o…

stall and flow separation on airfoil or blade

stall stall and flow separation Table of Contents 1. Stall and flow separation 1.1. Separation of Boundary Layers 1.2. Types of stall 1.3. Post stall airfoil data for BEM 1.3.1. Extraplolation methods: 1.3.2. Reference 1.4. Parameters affects stall 1…

Core - Provide an easy way to store administrator and user model differences in a custom store (e.g., in a database)

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[翻译+山寨]Hangfire Highlighter Tutorial

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EF 5 最佳实践白皮书

Performance Considerations for Entity Framework 5 By David Obando, Eric Dettinger and others Published: April 2012 1. Introduction Object-Relational Mapping frameworks are a convenient way to provide an abstraction for data access in an object-orient…

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转：python获取linux系统及性能信息

原文:http://amitsaha.github.io/site/notes/articles/python_linux/article.html In this article, we will explore the Python programming language as a tool to retrieve various information about a system running Linux. Let’s get started. Which Python? When…

（转）分布式深度学习系统构建简介 Distributed Deep Learning

HOME ABOUT CONTACT SUBSCRIBE VIA RSS DEEP LEARNING FOR ENTERPRISE Distributed Deep Learning, Part 1: An Introduction to Distributed Training of Neural Networks Oct 3, 2016 3:00:00 AM / by Alex Black and Vyacheslav Kokorin Tweet inShare27 This pos…

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Why Apache Beam? A data Artisans perspective

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paper 83：前景检测算法_1(codebook和平均背景法)

前景分割中一个非常重要的研究方向就是背景减图法,因为背景减图的方法简单,原理容易被想到,且在智能视频监控领域中,摄像机很多情况下是固定的,且背景也是基本不变或者是缓慢变换的,在这种场合背景减图法的应用驱使了其不少科研人员去研究它. 但是背景减图获得前景图像的方法缺点也很多:比如说光照因素,遮挡因素,动态周期背景,且背景非周期背景,且一般情况下我们考虑的是每个像素点之间独立,这对实际应用留下了很大的隐患. 这一小讲主要是讲简单背景减图法和codebook法. 一.简单背景减图法的工作原理. 在视频…

A Complete Tutorial on Tree Based Modeling from Scratch (in R & Python)

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iOS Architecture Patterns

By Bohdan Orlov on 21 Mar 2016 - 0 Comments iOS FYI: Slides from my presentation at NSLondon are available here. Feeling weird while doing MVC in iOS? Have doubts about switching to MVVM? Heard about VIPER, but not sure if it worth it? Keep reading t…

卷积神经网络Convolutional Neural Networks

Convolutional Neural Networks NOTE: This tutorial is intended for advanced users of TensorFlow and assumes expertise and experience in machine learning. Overview CIFAR-10 classification is a common benchmark problem in machine learning. The problem i…

iOS处理XMl提供GDataXMLNode下载的链接

GDataXMLNode .好东西,处理xml 在iOS 中使用.可以编辑和读取Xml文档.支持Xpath.这个很好. GDataXMLNode.h GDataXMLNode.m 文件很不好找啊. /* Copyright (c) 2008 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compli…

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原文地址http://www.vogella.com/tutorials/EclipseRCP/article.html Table of Contents 1. Eclipse 4 1.1. What is Eclipse 4? 1.2. Eclipse 4 vs. Eclipse 3.x 1.3. Terminology 2. The Architecture of Eclipse 2.1. Eclipse based applications 2.2. Core components of…

Machine Learning for Developers

Machine Learning for Developers Most developers these days have heard of machine learning, but when trying to find an 'easy' way into this technique, most people find themselves getting scared off by the abstractness of the concept of Machine Learnin…

Preparing for Different Databases

Preparing for Different Databases In the previous chapter, we created a PostRepository that returns some data from blog posts. While the implementation was adequate for learning purposes, it is quite impractical for real world applications; no one wo…

Django中的Model继承

Django 中的 model 继承和 Python 中的类继承非常相似,只不过你要选择具体的实现方式:让父 model 拥有独立的数据库:还是让父 model 只包含基本的公共信息,而这些信息只能由子 model 呈现. Django中有三种继承关系: 1.通常,你只是想用父 model 来保存那些你不想在子 model 中重复录入的信息.父类是不使用的也就是不生成单独的数据表,这种情况下使用抽象基类继承 Abstract base classes. 2.如果你想从现有的Model继承并让每个…

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D3D 11到D3D 12的重大改进 Direct3D 12 的编程模型和 Direct3D 11大相径庭.在Direct3D 12中,应用程序和硬件靠得近多了,这在以前是从未有过的. 这让D3D12 变得前所未有的快速和高效.但是速度和效率提高的代价是,相比D3D11,Direct3D 12需要在应用程序中完成更多的任务. 显式同步处理物理内存驻留管理命令列表和命令集(Command list 和command bundle) 描述符堆和描述符表从D11移植到D12 相关主题 Direc…

JavaScript Garden

Objects Object Usage and Properties Everything in JavaScript acts like an object, with the only two exceptions being null and undefined. false.toString(); // 'false' [1, 2, 3].toString(); // '1,2,3' function Foo(){} Foo.bar = 1; Foo.bar; A common mis…

springboot +spring security4 自定义手机号码+短信验证码登录

spring security 默认登录方式都是用户名+密码登录,项目中使用手机+ 短信验证码登录, 没办法,只能实现修改: 需要修改的地方: 1 .自定义 AuthenticationProvider 配置: package com.ycmedia.security; import java.util.ArrayList; import java.util.Collection; import java.util.List; import org.springframework.beans.f…

The Model Complexity Myth

The Model Complexity Myth (or, Yes You Can Fit Models With More Parameters Than Data Points) An oft-repeated rule of thumb in any sort of statistical model fitting is "you can't fit a model with more parameters than data points". This idea appea…

net programming guid

Beej's Guide to Network Programming Using Internet Sockets Brian "Beej Jorgensen" Hallbeej@beej.us Version 3.0.15July 3, 2012 Copyright © 2012 Brian "Beej Jorgensen" Hall Contents 1. Intro 1.1. Audience 1.2. Platform and Compiler 1.3. …

qemu kvm 虚拟化

虚拟化: KVM是一个基于Linux内核的虚拟机,属于完全虚拟化.虚拟机监控的实现模型有两类:监控模型(Hypervisor)和宿主机模型(Host-based).由于监控模型需要进行处理器调度,还需要实现各种驱动程序,以支撑运行其上的虚拟机,因此实现难度上一般要大于宿主机模型.KVM的实现采用宿主机模型(Host-based),KVM是集成在Linux内核中的,因此可以自然地使用Linux内核提供的内存管理.多处理器支持等功能,易于实现,而且还可以随着Linux内核的发展而发展.另外,目前KV…

SICP阅读笔记(一)

2015-08-25 008 Foreword QUOTE: I think that it's extraordinarily important that we in computer science keep fun in computing...... What's in your hands, I think and hope, is intelligence: the ability to see the machine as more than when you we…

EF查询数据库框架的搭建

一个简单的EF查询框架除了运行项目外,大概需要5个类库项目,当然这个不是一定要这样做,这可以根据自己的需要设置有多少个项目.这里介绍的方法步骤只适合EF零基础的人看看就是了. 在开始之前,先建立一个运行项目,不管是MVC还是winfrom项目,只要能运行就OK,这是为了在后面能测试EF框架的地方. 一.模型项目.这个项目主要负责与数据库映射的,里面的类都是数据库表的实体. 首先在解决方案中建一个文件夹EFModel,这里将会收纳所有的与EF查询有关的项目,这样做只是为了将他们与运行项目分开而已,…