In outer space down to the altitudes routinely flown by larger aircrafts, radiation can pose serious issues for microelectronics circuits. The 88-Inch Cyclotron at Lawrence Berkeley National ...Laboratory is a sector-focused cyclotron and home of the Berkeley Accelerator Space Effects Facility, where the effects of energetic particles on sensitive microelectronics are studied with the goal of designing electronic systems for the space community. This paper describes the flexibility of the facility and its capabilities for testing the bombardment of electronics by heavy ions, light ions, and neutrons. Experimental capabilities for the generation of neutron beams from deuteron breakups and radiation testing of carbon nanotube field effect transistor will be discussed.
Switching variability in polycrystalline compliance-free HfO 2 -based 1R RRAM is evaluated employing ultra-fast low voltage pulse approach. Changes in filament conductivity are linked to the ...variations of energy consumed in a switching process. This study indicates that variability is reduced (suppressed) in more resistive filaments.
Carbon nanotubes (CNT) resistance-change memory devices were assessed for neuromorphic applications under high frequency use conditions by employing the ultra-short (100 ps -10 ns) voltage pulse ...technique. Under properly selected operation conditions, CNTs demonstrate switching characteristics promising for various NN implementations.
In outer space down to the altitudes routinely flown by larger aircrafts, radiation can pose serious issues for microelectronics circuits. The 88-Inch Cyclotron at Lawrence Berkeley National ...Laboratory is a sector-focused cyclotron and home of the Berkeley Accelerator Space Effects Facility, where the effects of energetic particles on sensitive microelectronics are studied with the goal of designing electronic systems for the space community. This paper describes the flexibility of the facility and its capabilities for testing the bombardment of electronics by heavy ions, light ions, and neutrons. Experimental capabilities for the generation of neutron beams from deuteron breakups and radiation testing of carbon nanotube field effect transistor will be discussed.
Memristive electrical behavior has recently gained attention because of technological advances in nanostructuring, which has enabled the fabrication of working devices. However, such investigations ...have been limited to mobile ionic systems, and memristive behavior in other types of nanoscale systems has been largely overlooked. Here, we report direct measurement of memristive behavior of defect states in a quasi-metallic, single-walled carbon nanotube (CNT) FET. After exposing the CNT FET to laser irradiation, the conductance-gate-voltage profile ( G - Vg ) indicates the creation of a gate-tunable, resonant electron scattering defect. Once a defect is formed, current flowing in the forward and reverse directions reversibly switches the G - Vg characteristics of the device. The changes in conductance are attributed to the current direction-sensitive changes in the structure of an isolated defect state in the nanotube. The defect-scattering spectra are extracted from the G - Vg data using a Landauer model.
We have directly observed broadband thermal noise in silica/tantala coatings in a high-sensitivity Fabry–Perot interferometer. Our result agrees well with the prediction based on indirect, ring-down ...measurements of coating mechanical loss, validating that method as a tool for the development of advanced interferometric gravitational-wave detectors.
The stability of Middle East respiratory syndrome coronavirus (MERS-CoV) was determined at 20°C--40% relative humidity (RH); 30°C--30% RH and 30°C--80% RH. MERS-CoV was more stable at low ...temperature/low humidity conditions and could still be recovered after 48 hours. During aerosolisation of MERS-CoV, no decrease in stability was observed at 20°C--40% RH. These data suggest the potential of MERS-CoV to be transmitted via contact or fomite transmission due to prolonged environmental presence.
Ambient temperature and humidity strongly affect inactivation rates of enveloped viruses, but a mechanistic, quantitative theory of these effects has been elusive. We measure the stability of ...SARS-CoV-2 on an inert surface at nine temperature and humidity conditions and develop a mechanistic model to explain and predict how temperature and humidity alter virus inactivation. We find SARS-CoV-2 survives longest at low temperatures and extreme relative humidities (RH); median estimated virus half-life is >24 hours at 10C and 40% RH, but ~1.5 hours at 27C and 65% RH. Our mechanistic model uses fundamental chemistry to explain why inactivation rate increases with increased temperature and shows a U-shaped dependence on RH. The model accurately predicts existing measurements of five different human coronaviruses, suggesting that shared mechanisms may affect stability for many viruses. The results indicate scenarios of high transmission risk, point to mitigation strategies, and advance the mechanistic study of virus transmission.
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