Entries with tag north carolina state university.

Researchers Design Stretchable Antenna for Wearable Devices

North Carolina State University scientists have created a stretchable antenna for use with wearable technologies. They say the antenna can be deformed and return to its original shape as the wearer moves. The researchers have been working on wearable sensors for health monitoring, but said there was “a clear need” for antennas to be developed in order for the data collected to be transmitted for proper monitoring or diagnosis by healthcare professionals. They created the antenna using silver nanowires and liquid polymer. Once the polymer material is set, the result is an elastic material that serves as a microstrip patch antenna’s radiating element, the portion of the antenna that radiates or receives radio-frequency energy. This printed antenna is bonded to another stretchy polymer ground layer containing an embedded, continuous layer of silver nanowires to complete the antenna. The researchers published their work online in ACS Applied Materials & Interfaces. (PhysOrg)(ACS Applied Materials & Interfaces) 

US Researchers Improve Graphene’s Stretchability

North Carolina State University and University of Texas researchers have developed a technique to make graphene more useful in a wider range of applications by making it more stretchable. This would enable graphene—a one-atom thick layer of the mineral graphite known for being conductive and strong—to be used in flexible or stretchable electronics and nanocomposite materials, which are new materials made from combining known substances. After applying a single layer of graphene to an elastic polymer substrate, the researchers stretched the material and examined it. They saw that, when the elastic returned to its original length, the graphene monolayer buckled. These ridges, which look similar to the bellows of an accordion, made the graphene more stretchable. They also studied how much graphene can be deformed by stretching before the interface between the materials fails, according to NCSU associate professor Yong Zhu. The scientists published their work in Advanced Functional Materials. (EurekAlert)(North Carolina State University)(Advanced Functional Materials)

Software Extends Battery Life

North Carolina State University researchers have developed software able to identify and process data that could accurately estimate a battery’s remaining charge. The research is part of ongoing work designed to create efficient battery-management techniques. Conventional computer models for estimating remaining battery charge are not very accurate because of the many variables the model needs, including factors such as temperature and rate of charge. The researchers developed a way to update the computer model in real time, which increases the estimate’s accuracy to within 5 percent. They will present their work later this month at the 38th Annual Conference of the IEEE Industrial Electronics Society in Montreal, Canada. (PhysOrg)(North Carolina State University)

Researchers’ Tool Aimed at the Cloud

North Carolina State University researchers have developed a new software tool they say prevents cloud-based system performance disruptions by automatically identifying and responding to potential issues before they can become problems. Because cloud computing resources are shared, when there is a software bug or problem in one virtual machine, the operation of the cloud can be affected. The software tool they developed examines factors including resource use, network traffic, and other system data to determine the normal operating state of each virtual machine. It uses this as the basis for finding deviations that might disrupt user services. The researchers say the tool uses less than 1 percent of the CPU load and 16 megabytes of memory. It is also reportedly able to identify up to 98 percent of anomalies with a 1.7 percent false positive rate. The team plans to work next on incorporating diagnostic tools into the software for detailed bug analysis and correction. The researchers will present their work 20 September at the 9th Annual ACM International Conference on Autonomic Computing in San Jose, California. (PhysOrg)(North Carolina State University)

Researchers Create Elastic Nanowires for Stretchable Electronics


North Carolina State University researchers have developed highly conductive and elastic conductors that could enable the creation of stretchable electronic devices. The researchers made the material by placing silver nanowires on a silicon plate. Then, they poured a liquid polymer over the substrate. When exposed to high temperatures, the polymer becomes an elastic solid in which the nanowires are embedded. They them removed the polymer material from the silicon. The researchers claim the material can be stretched up to 50 percent without affecting conductivity. They published their work in Advanced Materials. (PhysOrg)(North Carolina State University)(Advanced Materials)

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