An innovative way to produce chalcogenide glasses and glass-ceramics for infrared devices is reported. This new method of synthesis at low temperature combining ball-milling sintering by SPS (Spark Plasma Sintering) a technological breakthrough efficient glass-ceramics. technique will offer the possibility strongly decrease cost glasses. It also permit increase potential some glass compositions allowing their shaping desired dimensions.

Abstract Glass is a material with rich history and bright future. Due to its outstanding properties versatility, it key in many applications. In this paper, we present variety of these applications which glass playing, will continue play, significant role, including communication technologies, the semiconductor industry, advanced displays, mobile consumer electronics, healthcare, automotive. Other critical considerations enabling continuous progress science engineering, such as improved...

In this paper, the feasibility to make molded glass–ceramics transparent in second and third atmospheric window has been investigated. The thermodynamical viscosity properties of base glass have measured confirming possibility generating crystals during molding at different temperatures. 71 Ga nuclear magnetic resonance confirms that gallium plays role nucleating agent glass. Examination X‐rays diffraction patterns optical indicates generation nanocrystals GeGa 4 Se 8 allows keep a wide...

Permanent Magnet Synchronous Machines (PMSM) are used in many applications, particularly high-performance drive systems. However, one inherent problem of PMSM is its parasitic undesired torque ripple, which reduces the performances. Several kinds ripples periodic functions rotor position. To reduce them, a method called Iterative Learning Control (ILC) seems well suited, but efficient for only constant speed chosen by designer (and all integer multiples this speed). design solution varying...

In this study, we present the preparation of a bulk material with composition 80 GeTe 2 –20 Ga Te 3 by combining mechanosynthesis and sintering. This cannot be prepared conventional melt/quenching technique. The progressive evolution powder during ball‐milling is followed X‐ray Diffraction ( XRD ) Differential Scanning Calorimetry analysis. final obtained highly crystalline, but glass transition temperature T g observed, indicating presence some amorphous phase remaining, allowing for its...

The possibility to synthesize GeSe4 glass by mechanical alloying followed sintering has been demonstrated. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) analysis have performed on the powder as a function of milling duration in order follow amorphization process raw metallic germanium selenium elements. Completely amorphous sintered using homemade hot press. Optical transmission density final bulk material studied.

Permanent magnet synchronous machines (PMSM) are widely used for high-performance drive systems. However, an important problem PMSMs is that parasitic torques may degrade the performances of system. These torque ripples generally vary periodically with rotor position and lead to speed ripple. To suppress these ripples, iterative learning control (ILC) used, because it a good candidate dealing periodical errors. In this paper, original approach called "lying sensor technique" proposed...

The sintering of the 80 GeSe 2 –20 Ga Se 3 chalcogenide glass composition as well preparation corresponding glass‐ceramics has been investigated using pulsed current electrical also known spark plasma sintering. Amorphous powder synthesized by mechanical alloying. Due to insulating property this composition, is heated mostly through heating graphite die. It was found that densification occurs a viscous flow mechanism prior devitrification. A model successfully applied determine viscosity and...

Repetitive control (RC) is a widely used effective approach for periodic reference tracking and disturbance rejection. In this paper, its use rejection piecewise constant analyzed in continuous-time framework. First, two previously proposed repetitive structures, namely the basic controller current iteration controller, are studied. We first show that they do not provide satisfying performance, either because of nonzero steady state error or large overshoots. Then new structure, named...

We introduce the Optical Materials Express feature issue that celebrates historic and recent advances in optical glass. In honor of United Nations declaring 2022 to be International Year Glass (IYOG), this comprises a collection twenty-seven manuscripts highlight processing, characterization/metrology applications where glass has changed our world.