IEEE

Multi-GNSS Real-Time Satellite Clock Estimation Using Regional Ground Stations and LEO Onboard Observations

Abstract: The use of GNSS observations collected onboard Low Earth Orbit (LEO) satellites to enhance GNSS satellite precise orbit determination has been intensively investigated. The fast speeds of ...
Journal of Medical Internet Research

Digital Phenotyping for Adolescent Mental Health: Feasibility Study Using Machine Learning to Predict Mental Health Risk From Active and Passive Smartphone Data

Feature importance was assessed using SHAP values, and associations between key digital features and clinical scales were analysed. Results: Integration of active and passive data outperformed ...
IEEE

Experiments of determining geopotential difference between two remote sites using two hydrogen clocks

Abstract: Based on the principle of geopotential frequency shift in general relativity, according to the geopotential frequency shift equation, the geopotential difference between two locations can be ...
studyfinds

These Atomic Clocks Wouldn’t Lose A Second In 13.8 Billion Years

What if a clock began tracking time at the very beginning of the universe? This clock would have to be so precise that it never gained or lost even a single second by today. That’s 13.8 billion years ...