The reuse of recycled aggregates in the composition of concrete is a major challenge today in response to the high cost of construction and the environmental impact of waste This work evaluates the the physic-mechanical properties of concrete using recycled building demolition aggregates and bituminous concrete of pavements in the Republic of Congo. The idea was to check whether these recycled aggregates can have the same performance as when they were first used in concrete. From the results obtained, the recycled building aggregates have good mechanical strength according to the Los Angeles (32.5%) and Micro-Deval (29.3%) tests. Concrete made from building demolition aggregates (CRA1#) has a 28-day compressive strength of (28.8MPa), which is very close to that of the CNA# control concrete (31.11MPa). Concrete incorporating a mixture of asphalt concrete and building demolition aggregates (CRA3#) has a compressive strength of 20.32MPa. In terms of compressive strength, only CRA1# and CRA3# can be used as class C25 concrete for CRA1# and C20 for CRA3#.

Mars, our neighboring planet in the solar system, boasts an environment characterized by its unique and ever-changing nature, shaped by a multitude of factors. To comprehend the intricate processes underlying the formation and transformation of Mars' atmosphere and its influence on climate patterns and potential habitability, we embark on a comprehensive exploration of three pivotal elements. The influence of solar wind, a continuous stream of charged particles emanating from the Sun, plays a pivotal role in molding the Martian environment. It triggers atmospheric sputtering, a phenomenon responsible for atmospheric erosion, and contributes to the development of miniature magnetospheres around the planet. The enigmatic Martian magnetic field, although waning in strength, still retains its importance in understanding habitability and the planet's geological evolution. Once generated by a liquid core, this magnetic field provides valuable insights into Mars' history. Dust storms, another remarkable feature, are driven by various factors and influenced by Mars' magnetic field, exerting a profound impact on climate and surface conditions. Their intensity and frequency fluctuate, affecting the planet's overall environment. Additionally, delving into atmospheric escape processes, especially the loss of water, sheds light on the evolution of Mars' atmosphere and its history. In sum, by examining the interplay of these phenomena, we glean invaluable insights into the dynamic nature of Mars and its enduring influence on the planet's ever-evolving environment.

High frequency modulation techniques play very important role in multilevel inverters MLIs. These techniques have several advantages over low frequency modulation methods where they provide lower harmonic contents and higher performance in real time adaptation. Multicarrier sinusoidal pulse width modulation MCSPWM is a common high frequency technique and control method for MLIs. The synchronization of carrier signals, complexity of hardware components and high cost are very important issues when implementing multicarrier MCSPWM in real time. This paper presents an efficient approach that can overcome the problems of multicarrier signals. The proposed approach combines the advantages of low and high frequency modulation techniques. Real time adaptation of modulation index can be achieved easily, and harmonics contents are reduced to very low levels as well. Simulation and comparison of the proposed approach with MCSPWM are presented. The proposed approach is applied and tested effectively with different topologies of MLIs.