The experimentally measured spectral density of current noise in Josephson junctions provides direct evidence for the existence of zero-point fluctuations. Assuming that the total vacuum energy associated with these fluctuations cannot exceed the presently measured dark energy of the universe, we predict an upper cutoff frequency of νc = (1.69 ± 0.05) × 1012 Hz for the measured frequency spectr...

We probe the Ioffe-Regel limits of glasses with repulsions near the zero-temperature jamming transition by calculating the dynamical structure factors. The Ioffe-Regel limit (frequency) is reached when the phonon wavelength is comparable to the mean free path, beyond which phonons are no longer well defined. At zero temperature, the transverse Ioffe-Regel frequency vanishes at the jamming trans...

HVDC circuit breaker with sufficient interruption capability and interruption speed, as a key technology to enable HVDC transmission in meshed multi terminal networks do not yet exist. AC circuit breakers in combination with a passive resonance path are used to build HVDC breakers even though the requirements for AC breaking strongly differ from requirements for DC current interruption. Current...

Changing network landscapes and rising security threats have imparted a sense of urgency for new approaches to security. Zero trust has been proposed as solution these problems, but some regard it marketing tool sell existing best practice while others praise cybersecurity standard. This article discusses the history development zero why changing threat landscape led discourse in cybersecurity....

An improved active snubber cell is proposed for ZVT-ZCT PWM DC-DC boost converter. Zero voltage transition (ZVT) turn on and zero current transition (ZCT) turn off is provided by this active snubber cell. There is no extra current or voltage stresses on the main switch. Also, zero current switching (ZCS) turn on ZCT turn off is provided for the auxiliary switch. Although there is no extra volta...

The HIV/AIDS pandemic has so far caused about 35 million deaths, while 34 million individuals currently live with HIV. 2 Even if this will have no impact on the course of the epidemic, understanding the factors that allowed the successful emergence of HIV-1 is important, first as a moral obligation towards the victims, but also to draw lessons that could ultimately help mankind avoid facing sim...

Monica M Lahra, Jo-Anne R Dillon, CR Robert George, David A Lewis, Teodora E Wi and David M Whiley WHO Collaborating Centre for Sexually Transmitted Diseases, Sydney, Department of Microbiology, South Eastern Area Laboratory Services, Prince of Wales Hospital, Randwick, NSW 2031, Australia School of Medical Sciences, Faculty of Medicine, The University of New South Wales, Kensington, NSW 2033, ...