Doppler Effects of Meteorology


“” source.

Doppler effects are used in many types of technology, and this is one example of using Doppler effects to work meteorology. The common design of the weather radar is a radar that covers with the sphere material around it (we can find this in Cambodia, it’s after the Chbar Ampov bridge there is a big ball and there is a radar inside there). The full word of radar is RAdio Detecting And Ranging. Doppler radar has a transmitter and a receiver. The transmitter transmits microwaves in 360 degrees into the atmosphere, and then the receiver is waiting to receive those signal that will return back. The signals that receive is called the radar echo. Precipitation is the one that reflects the microwaves back. The information that the receiver receives is in two form: relative and velocity. Relative tells where the precipitation is; the velocity, happens only in the Doppler radar, output the velocity of the wind. If the frequency is high the precipitation is moving toward the radar; if the frequency low the precipitation is moving away from the radar. Here is an example, “If particles switch from moving toward and then away from the Doppler radar over a small distance, the source may be a tornado.” As a result, Doppler effects benefits a lot to human, the concepts can save people’s life from storms like a tornado.

HIV Workshop

HIV is one of the topics that I wonder? I used to hear about HIV and AIDs, but I never get a chance to go deeply into it. For the past 3 years, I learned about the poverty in Cambodia and we did come across the topic of HIV. Moreover, we went to a community at Kampong Chhnang where most of the family got HIV and did some interview while I don’t really know about HIV. 

However, our senior students had come up with a workshop about HIV. It was a phenomenal workshop for me, I can get a better understanding of HIV. One of the activity was lean creating an HIV simulation. For people who got HIV, they need to take pills very consistently or else the virus will get worse. So what they simulate was, the participants need will have candy; they need to take the candy that acts as a medicine consistently within 20 minutes. It was a really cool experience for me to do that simulation and I did take the pills very consistent. I learned a lot with this workshop and it worth with the time it took me.

Data Visualization

Part of the expertise that I have 2 hours per week, Monday to Tuesday, is creative technology. In the expertise, it focuses on engineering and art.  This is the third project that we did in the expertise, which is data visualization. What data visualization is how we use data to display it in a creative canvas. We use p5.js which is part of the Javascript package, to code. My data is Cambodian provinces’ demographic, this also included the poverty rate. I got the data from Open Development which is a website that contains a lot of data from countries in South-East Asia. I represent each province with a dot, the bigger dot the higher number of the poverty rate. I made a logic that if a province that had a high poverty rate then it would take a long time to develop. So as our mouse moves to the right, it represents a high level of development. So as stated earlier, if a province has a high poverty rate, it means that the time it takes for the dot to reach the mouse is longer compare to the time it takes for a province that has a lower poverty rate. As an example, Phnom Penh has a really low poverty rate, so the dot is very very small and the speed to develop is fast!

Data visualization of the poverty rate in Cambodia 

Here is a link to the simulation: 

Below is an example of the code: 

let prov = [];
class Data{ 
  constructor(pov_rate, speed){ 
    this.pov_rate = pov_rate; 
    if(speed > 5) this.speed = speed; 
    else  this.speed = 2; 
    this.lastPosY = 0; 
    this.lastPosX = 0; 
  setTo(posX, posY){ 
    this.lastPosY = posY; 
    this.lastPosX = posX; 
    ellipse(posX, posY, abs(this.pov_rate)* 1.5); 

  runTo(goal, i){ 
    var sp = 25 - (this.pov_rate - this.speed); 
    var run = this.lastPosX + sp/5; hit = collidePointCircle(mouseX,mouseY, run, this.lastPosY, abs(this.pov_rate) * 1); 
      text([i].PRO_Name, width/2, 50); 
      text("Poverty Rate: " +[i].pov_rate + "%", width/2, 80);
    if(run < goal - 20) this.setTo(run, this.lastPosY); 
    else ellipse(run, this.lastPosY, abs(this.pov_rate)*1.5); 

Women in STEM – Women International Day

Our seniors talked about their marine project!

It’s March 8th and it’s also Women International Day most work of Liger stuffs has a day off. Not to be mean but Women International Day in this country seems a little bit quiet. In out Khmer class we had a discussion about why we have this event! I was very happy to learn about this because I can have a better understanding of women’s issue around the world and of course being a good husband in the future. 

Previously in physics class, we learned about women in STEM and we can see that there weren’t that many women in the STEM. So on that day, I was being a part of the participants at the event called “Girls in Science & Technology” lead by Cambodia Children’s Fund foundation. There were a lot of women at there presenting about their projects, and two of our Liger group were there to present there application and marine project. 

It was a very cool event to see only women projects and they are very incredible; I’m proud of them. One of the projects was working with Bluetooth and a car. The car was very fancy and the motion of the car was very smooth which explain to me that they give a lot of hard work into it.