Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.

“To provide enough power, we need certain methods with high energy density(密度)”, said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”

Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanical systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.

“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”

His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.

“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”

Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.

Imagine wearing high-tech body armour that makes you super strong and tireless. Such technology, more specifically called an exoskeleton, sounds like the preserve of the Iron Man series of superhero movies.

Yet the equipment is increasingly being worn in real life around the world. And one manufacturer---California’s SuitX---expects it to go mainstream. “There is no doubt in my mind that these devices will eventually be sold at hardware stores,” says SuitX’s founder Homayoon Kazerooni. In simple explanation, an exoskeleton is an external device that supports, covers and protects its user, giving greater levels of strength and endurance. Sometimes also referred to as “wearable robots”, they can be battery-powered and computer-operated, incorporating motors and hydraulics. Or they can be more simple, passive designs that use springs and dampeners.

“Integrating machines with humans opens up a new realm of opportunity,” says Adrian Spragg, an expert on the technology at management consultancy Accenture. “Many of the early applications have been focused on military and medical applications, but in the last several years there’s been an explosion of use in a range of cases.” This expansion, which has come together with rapid advances in the technology, has seen exoskeletons increasingly used by manufacturing workers. Versions for consumers are also now being developed to help people more easily do everything from DIY, to walking, climbing stairs, and other daily activities.

One report says sales are now due to rocket as a result. Global exoskeleton revenues are expected to rise from $392m in 2020 to $6.8bn in 2030, according to a study by ABI Research. SuitX’s “suits” are now being tested by car manufacturers General Motors and Fiat. Prof Kazerooni, who is also the director of the University of California’s Berkeley Robotics and Human Engineering Laboratory, says that the primary benefit of the firm’s exoskeletons is to prevent muscle fatigue. “We’ve shown that muscle activity in the back, shoulder and knees drops by 50%,” he says. “If muscle activities drop, that means the risk of muscle injury is less. This means that factory or plant managers get more productivity, their insurance costs are lower, and there are less workdays lost to injury. There’s less cost and more productivity.”

General Motors is also looking at a battery-powered exoskeleton glove developed by Bioservo. This glove, called the Iron Hand, has sensors and motors in each finger, which automatically respond to the level of force that the wearer applies to his or her hand when lifting or gripping something. The glove therefore takes up some of the strain. BioServo says it can increase the wearer’s hand strength by 20% for extended periods.

Elderly people have a higher chance of suffering from illnesses such as diabetes, cancer, and heart disease. One common health problem that affects them is Alzheimer’s disease, which affects a person’s memory, behavior, and thinking. Because of memory loss and behavioral changes, people with Alzheimer’s may slowly become unable to take care of themselves, eventually requiring constant care from family members or caregivers.

There is no cure for Alzheimer’s at the moment—drugs can only treat its symptoms.

But technology can improve the lives of those living with the condition by making it easier for them to go about their daily activities. For example, tracking devices placed in watches or jewelry can monitor where a person is. Automated reminders can also be stored in motion sensors and placed around the house. When a sensor detects movement, it can play a recorded voice message to remind the person to lock the door or turn off the stove.

Alzheimer’s disease is a huge challenge, but we may be getting close to finding a solution. In the future, it might be possible to treat Alzheimer’s without using drugs. A team of researchers in Australia has created a form of technology that can send sound waves into the brain. These sound waves help to clear waste in the brain that contributes to Alzheimer’s. The team has tested their technology and found that it helped to restore memory in 75 percent of mice. Work on the technology isn’t complete, but, if successful, it could prevent memory loss in people with Alzheimer’s. This really does fundamentally change the understanding of how to treat this disease and researchers foresee a great future for this approach.