摘要：
Over the past two years,reconfigurable intelligent surface(RIS),as a promising emerging technology for Beyond 5 G(B5 G) and 6 G mobile communications systems,has attracted enormous interest from both academia and industry worldwide.In IMT-2030(6 G) Promotion Group of China,the RIS task force was created in June 2020.
摘要：
One of gurus in the field of acoustics and vibration was Leo Beranek,an engineer and scientist born in the family of a farmer who came to USA from Bohemia(now a part of the Czech Republic).Several generations of vibroacoustic engineers studied a lot from his books and utilized the measurement techniques invented and implemented by him.
摘要：
Recently the engine oil with its additive formulation independently developed by the SINOPEC Research Institute of Petroleum Processing(RIPP)has successfully passed a whole series of engine tests for the ACEA C5 grade oil,incarnating that RIPP has known well the latest technique for formulating the engine oil in compliance with the ACEA C5 grade oil quality requirements,which is a genuine breakthrough in formulating the ACEA C5 grade engine oil with domestically-made independent additive package.
摘要：
Although known as a "sunset industry"for many years,traditional engine-makers are still optimistir and firm about the future of the internal combustion engine(ICE)in line with the naive idea "ICE will not cease as long as petroleum does not dry up".However,as the domestic anrl international wave of low carbon and zero carbon develops from appeal to action,green energy has swept in,and the engine-makers began to panic……
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