A model-theoretic approach can establish security theorems for cryptographic protocols.Formulas expressing authentication and non-disclosure properties of protocols have a special form.They are quantified implications for all xs.(phi implies for some Vacuum Belt ys.psi).Models (interpretations) for these formulas are *skeletons*, partially ordered
Objective: To study the characteristics and risk factors of carotid atherosclerosis in populations at high risk of stroke in urban and rural areas of North China.Methods: A cross-sectional study was conducted to investigate high stroke risk populations in representative urban and rural areas sampled from 12 regions of China.A pre-designed questionn
A dual-resolution, hybrid, three-dimensional ensemble-variational (3DEnVAR) data assimilation method combining static and ensemble background error covariances is used to assimilate radar data, and pseudo-water vapor observations to improve short-term severe weather forecasts with the Weather Research and Forecast (WRF) model.The higher-resolution
Reflectance spectroscopy is a powerful tool to remotely identify the mineral and chemical compositions of the lunar regolith.The lunar soils contain silicate minerals with prominent absorption features and SERVING BOARD glasses with much less distinctive spectral features.The accuracy of mineral abundance retrieval may be affected by the presence o
Background: The sudden adoption of e-learning as a quick alternative educational system to rescue education due to the widespread chaos to which educational institutions have been exposed due to the Covid-19 pandemic since 2020, while paying no attention to the readiness of educational institutions, learners, and instructors for these systems, led