Paul Ohodnicki named new Center for Energy Director at University of Pittsburgh
Dr. Paul Ohodnicki joins as permanent director, succeeding Heng Ban; to expand energy research and education capabilities across multiple disciplines.
Alternating Current
Articles tagged with Alternating Current
Alternating current bias capacitance imaging enables stable, high-performance perovskite X-ray detector
Metal halide perovskites have higher X-ray sensitivities than semiconductors. However, nonlinear current responses arise under DC and irradiation, limiting device reliability. A novel AC bias capacitance readout strategy overcomes this challenge.
Novel fast charging solution for electric vehicles
Researchers at IISc have developed a novel cascaded H-bridge-based multiport DC converter to directly connect to the medium-voltage AC grid, eliminating the need for large and expensive LFTs. This technology offers a 3-5% improvement in energy efficiency and reduces costs, making electric vehicle charging stations environmentally frien...
Alternating currents for alternative computing with magnets
Scientists have successfully generated spin waves with high amplitudes using alternating currents in a simple magnetic stack. This breakthrough has significant implications for creating reprogrammable magnonic circuits and developing energy-efficient computing systems.
NUS researchers develop new battery-free technology to power electronic devices using ambient radiofrequency signals
A team of NUS researchers developed a compact and sensitive rectifier technology that uses nanoscale spin-rectifiers to convert ambient wireless radio frequency signals into DC voltage. The technology overcomes challenges in existing energy harvesting modules, enabling battery-free operation for small electronic devices.
Offshore windfarms – A threat for electro-sensitive sharks?
New research reveals offshore windfarm electromagnetic fields have minimal impact on shark growth and survival, but ongoing studies aim to improve understanding of effects on marine species. The study focused on small-spotted catshark development under control and windfarm-impacted conditions using AC or DC currents.
Study offers details on using electric fields to tune thermal properties of ferroelectric materials
Scientists from NC State University have discovered a way to manipulate the flow of heat through ferroelectric materials by applying different electric fields. The study, published in Advanced Materials, found that varying electric field strengths, types (AC/DC), time, and frequency can alter the thermal properties of these materials.
New study shows electric fields can improve the efficiency of wastewater purification
Researchers from South Korea have demonstrated that applying an electric field during air stripping can significantly improve ammonia removal efficiency from wastewater. The study found that electric fields with alternating current of 50 MHz and power of 15 V/cm increase efficiency from 51% to 94%, even under sub-optimal conditions.
Pusan University Researchers Develop ‘Super-Flexible’ Electroluminescent Devices
Researchers from Pusan University developed a super-stretchable, deformable, and durable material for 'super-flexible' alternating current electroluminescent devices. The material was successfully applied in devices that functioned with up to 1200% elongation, displaying stable luminescence over 1000 cycles.
Contactless high performance power transmission
A team of physicists at TUM has developed a coil with superconducting wires capable of transmitting power in the order of more than five kilowatts without significant loss. The researchers optimized the distance between individual windings to achieve a higher power density, paving the way for exciting application areas such as industri...
Protecting the power grid: Advanced plasma switch for more efficient transmission
A team of scientists at GE and PPPL has developed an advanced plasma switch that can convert high-voltage DC current to AC current efficiently, reducing the cost of long-distance power transmission. The switch uses helium gas inside a tube filled with plasma, which is more efficient than existing semiconductor switches.
Current stimulation may keep visual neurons alive after injury -- but at a cost
Researchers from Magdeburg University and The Chinese University of Hong Kong found that electrical stimulation can preserve visual neurons from cell death after injury, but it induces a fast disconnection of dendritic tree. This may protect the neurons from toxic excitation after brain damage.
Two-stage power management system boosts energy-harvesting efficiency
A two-stage power management system developed by Georgia Tech researchers improves triboelectric generator efficiency, enabling the powering of wearable and mobile devices. The system converts fluctuating energy amplitudes to continuous direct current, increasing energy output up to 330 times.
Direct current, another option to improve the electrical power transmission
Researchers propose using direct current lines to improve power transmission and balance renewable energy production. The GISEL group develops new VSC technology for converters, offering advantages in controlling power transmission and reducing losses.
Noninvasive current stimulation improves sight in patients with optic nerve damage
Researchers found that treating patients with low-level non-invasive current stimulation for 10 days significantly reduced visual impairment and improved vision-related quality of life. The study showed a 41% shrinkage of visual field loss in treated patients compared to those receiving sham treatment.
Instead of defibrillator's painful jolt, there may be a gentler way to prevent sudden death
Researchers at Johns Hopkins Medicine have found a way to halt life-threatening arrhythmia using lower amplitude, high-frequency alternating current. This approach may prove less painful for patients and could lead to a new device that replaces painful defibrillator shocks.
Ratchet effect solves one problem in superconductors
Researchers propose using an alternating current to pattern a sawtooth-like structure on a superconductor, directing vortices away from the device. This method avoids sophisticated material processing and can be used in both low-temperature and high-temperature superconductors.