President Volodymyr Zelenskiy asked Ukraine’s head of military intelligence to become his chief of staff, filling one of the country’s most influential positions after Andriy Yermak stepped down amid ...

President Volodymyr Zelensky said that in addition to that appointment, he planned to name a new defense minister as part of “a wave of personnel changes.” By Cassandra Vinograd and Andrew E. Kramer ...

Abstract: Aiming at the demand of oxygen partial pressure measurement in aerospace and aviation, a tunable diode laser absorption spectroscopy (TDLAS) technique is proposed to realize the oxygen ...