Talking to Mars: new antenna design could aid interplanetary communication
New research provides a compact but powerful way for Mars rovers to communicate directly with Earth via an array of smaller antenna elements, bypassing the need for an intermediary.
By Yahya Rahmat-Samii

Our antenna “organs” begin with a specialized geometry that looks like half of the letter “E.” We derived it from the original E-shaped antenna design we’ve already had a lot of success with. This novel “half-E” shape allows the antenna to transmit and receive radio signals which are circularly polarized. Basically that means the polarization of the radio waves can be oriented in a special configuration that helps reduce the effects of atmospheric gases and particles on the waves as they travel. It can also help to make sure a strong signal is maintained even if the rover itself or the antennas are moving.

When enough of these antenna elements – 256 in this case – are combined together just right into what antenna engineers call an array, the whole can transmit and receive much greater power.

America’s Best Bachelor Degrees By Salary [Infographic]

Attending and graduating from university can never guarantee you a well-paid job down the road. However, some bachelor degrees are more likely than others to make you a high earner. Read more.


Branch Technology 3D Prints Building Walls with Worlds Largest Freeform 3D Printer Launches 3D Printed Home Competition!

Many have not noticed the potential that lies within 3D printing with the construction industries. Almost recently that architects and builders around the world have realized its benefits: reduction to workforce and savings in construction cost. 

Platt Boyd has been one of the few who has recognized how 3D printing’s future within architecture and construction is too beneficial to pass up on. Branch Technology, a Chattanooga, Tennessee-based startup already announced that it is the first company to successfully construct building walls at scale using the world’s largest freeform 3D printer. 

This company is now announcing that it will sponsor the world’s first design contest to 3D print a home, starting September and culminating it with a $10,000 prize and the construction of a 3D printed home in Chattanooga.

Over the course of the last several months, Branch has created many intricate 3D printed demo pieces of the walls many in which are strongly based on natural forms, combining light-weight architecture and super strong engineering. 

 “It bridges art and function and I’m excited to see how it will change the way we think about the spaces where we live and work,” explains Shawn Thorne of Branch Technology. “We can’t wait to show you what the final products can look like.”

From the spinning disc of a computer’s hard drive to the varying current in a transformer, many technological devices work by merging electricity and magnetism. But the search to find a single material that combines both electric polarizations and magnetizations remains challenging.

This elusive class of materials is called multiferroics, which combine two or more primary ferroic properties. Northwestern Engineering’s James Rondinelli and his research team are interested in combining ferromagnetism and ferroelectricity, which rarely coexist in one material at room temperature.

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Meet Oobleck ( Corn Starch )- A Non- Newtonian Fluid!

It is a fluid, but not the conventional type. You can walk or even dance on it and yet not sink. Under the percussive action of the speaker, it abstractly behaves as a solid! 

You can dip your hands in it and play around with it like any other fluid. But if you try to punch it ( see animation ) it becomes hard ( like a solid).

Bewitching isn’t it?

PC: Slowmoguys, Discovery, Hong Leong Bank.


Here’s an updated version of my math-based lecture notes video, and hopefull more of you will be able to see it this time :)

If you’re looking for the first part, which is taking notes from the textbook, you can find that here.