未分类 on martinphysics.club

I Built a Simple Optical Simulation Tool

Fri, 28 Aug 2026 03:39:45 +0000

LightDraw began with a simple goal: to make optics easier to teach, explore, and understand. While building this lightweight 2D optical simulator, I incorporated real classroom needs into its design. Since light is an electromagnetic wave, I also expanded the project to support electrostatic and magnetostatic field simulations. Built with .NET, Avalonia, and SkiaSharp, LightDraw turns abstract physics into clear, interactive visualizations for teachers and students. Explore the project on GitHub or download LightDraw from the Microsoft Store. Special thanks to the creators and contributors of Ray Optics Simulation, whose excellent work inspired this project.

I choose WPF as my first Windows-based App Framework in 2025

Thu, 20 Mar 2025 14:04:23 +0000

Windows Presentation Foundation (WPF) was born in November 21, 2006. At that time i was a “child” who only know use VB.NET to creat old fashion GUI Application. At that time I prefer find a app than creat one by my-996-self.Not crazy about coding.

The Beginning

The meaningful time is about 2016.Microsoft released Universal Windows Platform(UWP) Framework,coder can code one sample to publish in Windows 10 destop/Windows 10 mobile/XBoxOne. I was so attracted to learn UWP by Channel 9’s video.I learned how to use XAML to design an interface/space and studied .NET syntax. From compiling a simple calculator to run on my Windows 10 PC and my Lumia phone, to flashing Windows 10 IoT on a Raspberry Pi and running my self-built local network media server—those were wonderful times.Back then, in China, platforms like NetEase Cloud Music were among the first to support the UWP framework, bringing countless surprises to users. Unfortunately, we, the 1%, still lost in market.

Why Is It So Hard for Chinese Students to Learn Physics and Coding Effectively

Tue, 17 Sep 2024 13:01:49 +0000

Recently, my former teacher asked his third-year students in a Laser Principles course (who had already studied electromagnetism/electrodynamics) to write Maxwell’s equations on the blackboard from memory. Whoever could do so would earn full marks for their participation grade.But no one could.

It’s worth mentioning that this university is an average institution in mainland China, and the students are mid-level undergraduates. The program is in the field of physics education.

Troubleshooting Property Update Issues in WPF DataGridCheckBoxColumn Bindings

Tue, 03 Sep 2024 10:46:36 +0000

Why does the CheckBox state change in WPF DataGridCheckBoxColumn not automatically update the bound property?

Situation：

My code has correctly implemented the binding relationship using the MVVM library, but I am unable to filter data using the checkbox in the DataGrid.

//model
public class SpectralPeakDataItem
{
 public bool IsUserFor { get; set; }

 public double Wavelength { get; set; }

 public int PixelPosition { get; set; }

 public double InstensityPercentage { get; set; }
}

//ViewModel
[ObservableProperty]
private ObservableCollection<SpectralPeakDataItem> _mercuryArgonSpectralPeakDataItems = [];

<ui:DataGrid
 Grid.Column="0"
 Margin="5"
 AutoGenerateColumns="False"
 ItemsSource="{Binding MercuryArgonSpectralPeakDataItems, Mode=TwoWay}">
 <DataGrid.Columns>
 <DataGridCheckBoxColumn Binding="{Binding IsUserFor, Mode=TwoWay}" Header="IsUserFor" />
 <DataGridTextColumn Binding="{Binding Wavelength, Mode=TwoWay}" Header="Wavelength" />
 <DataGridTextColumn Binding="{Binding PixelPosition, Mode=TwoWay}" Header="PixelPosition" />
 <DataGridTextColumn Binding="{Binding InstensityPercentage, Mode=TwoWay}" Header="Percentage" />
 </DataGrid.Columns>
</ui:DataGrid>

However, in the usual event-driven code design, it works fine.So, I think this is an issue with MVVM’s data binding, as it doesn’t seem to achieve data synchronization.So next, I discovered that:In a WPF DataGridCheckBoxColumn, the reason why changes in the CheckBox’s checked state do not automatically trigger property updates is primarily because the DataGridCheckBoxColumn uses a binding context that may not directly reflect changes in the CheckBox state. This often involves the following issues:

Deploy Moonglade Blog System Manually on Linux Server

Sun, 01 Sep 2024 08:05:26 +0000

Beginning

Hello there! Recently, I’ve been thinking about moving my blog system from WordPress/GitHub Pages to a more reliable environment. My friend Edi Wang mentioned that his Moonglade Blog System can be deployed without Azure, and I’ve been interested in his blog system for a long time. So, I decided to start my 996 deployment.

Environment Setup:

A server (Windows/Linux; I chose a Vultr VPS with Ubuntu 24.04 LTS x64 for this guide)
A domain with properly configured DNS pointing to your server
An already set-up database(Means ctreat database,tables can be automatically creat by Moonglade)

Some Tips:

Sever chosening :You can opt for an Oracle ‘Always Free’ cloud instance for the Linux server, but the firewall settings can be quite complex.If u r looking for a cheap but reliable vps,try vultr with my aff.I recommend a 1 CPU, 1 GB RAM server for $5/month, which I’ve tested and found adequate for this system.
Database & Domain : Moonglade supports multiple database systems (Microsoft SQL Server, MySQL, PostgreSQL. Please Check this link FYI). Database setup is not covered in this guide. The same applies to domain registration and DNS configuration.
Why not Dockers ：as my saids in title,an reliable environment.
Building Soucre Code : Using the Release Version is highly recommended; avoid using the master branch.

Setp to setp deployment

Get code and Build project

download the latest “Source code(zip)” in https://github.com/EdiWang/Moonglade/releases in a Linux/Windows environment.I strongly recommend that you start compiling from the source code. Because every time I use the version compiled by github, strange problems will occur.

使用.Net搭配EF Core记录你城市的天气

Fri, 08 Dec 2023 21:09:08 +0000

项目简述

这个项目是我在学习.Net Core编程的时候用到的简单例子，整体就是通过Get请求获取某地区的天气信息，经过json反向序列化后写入到数据库中存储起来。通过.net6的EntityFramework我们可以很优雅地为这个小项目进行CodeFirst的设计（沿用杨中科老师的一个观点：“关系型数据库对程序员来讲只是一个存放数据模型的媒介，理想状态下程序员不用关心数据库的操作。”）这个项目将会用EntityFramework进行数据库的CURD操作，任务目标：

从牛顿第二定律到火箭运动方程

Sat, 03 Apr 2021 17:19:03 +0000

从牛顿第二定律出发，由加速度、动量的定义可以得出动量定理：

F=m\frac{dv}{dt}\Rightarrow\Delta p=F\Delta t

假设变质量时仍然满足动量定理，讨论合外力为0的简单条件下得出动量守恒定律：

\Delta p=0

对火箭，设箭体的对地速度为v，喷射气体对地速度为u，建立变质量动量守恒有：

Quantum Wave Function Visualization

Thu, 04 Jun 2020 11:31:38 +0000

Polarization of Light

Fri, 22 May 2020 11:34:35 +0000

Thanks Youtube Channel Physics Videos by Eugene Khutoryansky.

求一均匀带电棒在真空中无限长带电导线的受力

Thu, 26 Mar 2020 05:38:12 +0000

题目：真空中有一无限长带电导线，其电荷线密度为。相距导线长度a处有一长为L的均匀带电棒AB，电荷量为Q，求AB棒的受力。

思路：微元法，先求场强分布，再求棒上的力元，再积分。

解一维谐振子

Thu, 26 Mar 2020 05:28:09 +0000

一维谐振子，是稳态系统。对应的是定态薛定谔方程。

对一维谐振子，其哈密顿量为：

\hat{H}=\frac{p_{x}^{2}}{2m}+\frac{1}{2}m\omega ^{2}x^{2}

对应定态的薛定谔方程为：

\hat{H}\psi (x)=E\psi (x),p=-i\hbar\frac{d}{dx}

代入可得：

-\frac{\hbar^{2}}{2m}\frac{d^{2}}{dx^{2}}\psi (x)+(\frac{1}{2}m\omega ^{2}x^{2}-E)\psi (x)=0

上述是二阶变系数常微分方程，在不知道一个特解的情况下无法（我不会）降阶解方程，所以做变换。

通过旧量子论解一维无限深势阱

Wed, 25 Mar 2020 05:25:04 +0000

有一个质量为m的球在一个一维的盒子里运动，盒子长度是a，盒子壁不可穿透，球和盒壁的碰撞是弹性的（即碰撞不会改变球的能量），盒子是固定的；球的大小忽略不计，不考虑摩擦力： 1、画出球在相空间的轨迹(至少两条) 2、按照旧量子论，求出这个球的量子能级**。** 3、解定态薛定谔方程。

解一维无限深势阱(解定态薛定谔方程)

Fri, 13 Mar 2020 05:17:39 +0000

定态薛定谔方程求解：

假设粒子在一维势场中运动，势场满足：

U(x)=\left\{\begin{matrix}0,0\leq x\leq a\\+\infty,x>a,x<0\end{matrix}\right.

解：

设粒子的波函数为\psi (x) , 由定态薛定谔方程得：

\hat{H}\psi (x)=E\psi (x)

其中\hat{H} 为粒子的哈密顿量，为粒子动能与势能的总和，E为粒子的能量。