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    Researchers demonstrate New, More Energy-Efficient Devices using Gallium Nitride

    September 7, 2022, Categories  Technology/Electronics, Physics

    Engineering researchers have created new high-power electronic devices that are more energy efficient than previous technologies. The devices are made possible by a unique technique for “doping” gallium nitride (GaN) in a controlled way.

    “Many technologies require power conversion — where power is switched from one format to another,” says Dolar Khachariya, the first author of a paper on the work and a former Ph.D. student at North Carolina State University. “For example, the technology might need to convert AC to DC, or convert electricity into work — like an electric motor. And in any power conversion system, most power loss takes place at the power switch — which is an active component of the electrical circuit that makes the power conversion system.

    “Developing more efficien...

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    Gamma rays from Neighboring Galaxy related to Millisecond Pulsars

    September 7, 2022, Categories  Astronomy/Space

    Sagittarius Dwarf
    A small satellite galaxy of the Milky Way – called the Sagittarius dwarf galaxy – has been observed from Earth through giant lobes of gamma radiation (the so-called Fermi bubbles). Although the dwarf galaxy is stuffed with dark matter, this is unlikely to be the cause of the observed emission. Image: O. Macias.

    A team of researchers, including UvA physicists and astronomers, has studied gamma rays caused by the Sagittarius Dwarf, a small neighbouring galaxy of our Milky Way. They showed that all the observed gamma radiation can be explained by millisecond pulsars, and can therefore not be interpreted as a smoking gun signature for the presence of dark matter. The results were published in Nature Astronomy this week.

    The center of our galaxy is blowing a pair of colossal bubbles ...

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    Having High Cholesterol and Reduced Physical Stamina and being Overweight are Long COVID Sequelae in Young Adults

    September 7, 2022, Categories  Health/Medical, Biology/Biotechnology

    Having high cholesterol and reduced physical stamina and being overweight are long COVID sequelae in young adults
    Test battery used in the Long COVID in Military Organizations study. The test battery was used to evaluate the long-term sequelae of COVID-19 in young adults. A variety of quantitative tests and standardized questionnaires were used to measure the effect on various organ systems and parameters in participants following COVID-19, asymptomatic SARS-CoV-2 infection, or in individuals who were non-exposed to SARS-CoV-2. Anti-N=anti-SARS-CoV-2 nucleocapsid. Anti-S=anti-SARS-CoV-2 spike. BDI-13=Beck Depression Inventory (13 items). CFQ-11=Chalder Fatigue Scale. eGFR=estimated glomerular filtration rate. FeNO=fractional exhaled nitric oxide. FSH=follicle stimulating hormone. HbA1c=glycated hemoglobin. IES-R=Impact of Event Scale-Revised. LH=luteinising hormone...
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    Researchers devise Tunable Conducting Edge

    September 7, 2022, Categories  Physics, Technology/Electronics

    A research team led by a physicist at the University of California, Riverside, has demonstrated a new magnetized state in a monolayer of tungsten ditelluride, or WTe2, a new quantum material. Called a magnetized or ferromagnetic quantum spin Hall insulator, this material of one-atom thickness has an insulating interior but a conducting edge, which has important implications for controlling electron flow in nanodevices.

    In a typical conductor, electrical current flows evenly everywhere. Insulators, on the other hand, do not readily conduct electricity. Ordinarily, monolayer WTe2 is a special insulator with a conducting edge; magnetizing it bestows upon it more unusual properties.

    “We stacked monolayer WTe2 with an insulating ferromagnet of several atomic layer thickness—of Cr2Ge2...

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