Applied Physics

 A new class of magnets that swell in volume when placed in a magnetic field also generate negligible amounts of wasteful heat during energy harvesting.

This "Non-Joulian Magnetostriction" could change the way we think about a certain type of magnetism that has been in place since 1841, when physicist James Prescott Joule discovered that iron-based magnetic materials changed their shape but not their volume when placed in a magnetic field. This phenomenon is referred to as "Joule Magnetostriction," and since its discovery 175 years ago, all magnets have been characterized on this basis.
Tomorrow at TedX Sydney’s Opera House event, high-profile neurosurgeon Charlie Teo will talk about brain cancer.

Last Saturday Teo was on Channel 9’s Sunrise program talking about the often malignant cancer that in 2012 killed 1,241 Australians.

During the program he said:

Unfortunately the jury is still out on whether mobile phones can lead to brain cancer, but studies suggest it’s so.

Liquid metal electronics like antennas are intriguing because the shape and length of the conducting paths that form an antenna determine its critical properties such as operating frequency and radiation pattern. Using a liquid metal, such as eutectic gallium and indium, allows for modification of antenna properties more dramatically than is possible with a fixed conductor. 

But a significant and unfortunate drawback slowing the advance of such devices is that they tend to require external pumps that can't be easily integrated into electronic systems, so North Carolina State University researchers set out to create a reconfigurable liquid metal antenna controlled by voltage only.


Currently, burning fossil fuels is the main source of energy here and around the world.  Those fuels emitting greenhouse gasses are considered by most associated scientific organizations in the world as contributing to a potential global catastrophe in the making.  With this, we are critically dependent on electricity for almost every necessity we have in our standard of living. 

By Sara Rennekamp, Inside Science -- Last week's deadly derailment that sent an Amtrak Northeast Regional train careening off its tracks has many people asking how such a tragedy could happen.

New research has brought us closer to understanding the health benefits of coffee.

Monash researchers, in collaboration with Italian coffee roasting company Illycaffè, have conducted the most comprehensive study to date on how free radicals and antioxidants behave during every stage of the coffee brewing process, from intact bean to coffee brew.


Bats are masters of flight, even at night. The best pilots in World War II would have to be envious of their steep nosedives and sharp turns.

But when we think about bats and flying, most people think of echolocation and their built-in radar. But that doesn't help while banking hard left. Instead, it is the sensation of touch - bats have a unique array of sensory receptors in their wings and provide feedback to during flight. A new study in Cell Reports suggests neurons in the bat brain respond to incoming airflow over the wings, noted by touch signals, and they make rapid adjustments to wing position to optimize flight control. 


Scientists have successfully imaged thunder for the first time.

A team from Southwest Research Institute has visually captured the sound waves created by artificially triggered lightning, they reported at a joint meeting of American and Canadian geophysical societies in Montreal.

Although people see it as a flashing bolt, lightning begins as a complex process of electrostatic charges churning around in storm clouds. These charges initiate step leaders, branching veins of electricity propagating down, which subsequently lead to a main discharge channel. That channel opens a path to nearly instantaneous return strokes, which form the lightning flash as we see it.

Researchers have shown that a laser-generated microplasma in air can be used as a source of broadband terahertz radiation.

In a paper published this week in Optica, Fabrizio Buccheri and Xi-Cheng Zhang demonstrate that an approach for generating terahertz waves using intense laser pulses in air - first pioneered in 1993 - can be done with much lower power lasers, a major challenge until now. Ph.D. student and lead author Buccheri explains that they exploited the underlying physics to reduce the necessary laser power for plasma generation. He adds that it could potentially be improved for applications in the monitoring of explosives or drugs.


Researchers have used mathematical equations to shed new light on how flowing fluid hinders the movement of bacteria in their search for food. Many bacteria are mobile and inhabit a variety of dynamic fluid environments: from turbulent oceans to medical devices such as catheters.

Since the first attempts at classifying bacteria in the 17th century, shape has been an important feature, yet it is still not fully understood how shape affects the ability of bacteria to navigate their environments.