Abstract Ceramic industry manufacturing requires a great amount of thermal energy. Its sustainability and environmental impact demand an effort to develop more efficient technologies reduce the consumption fuel, mainly natural gas. In particular, sanitary-ware production sector presents defined special map through process because heat amounts levels temperature. The aim this research is quantif...

Phononic crystals (PnCs) are the acoustic wave equivalent of photonic crystals, where a periodic array of scattering inclusions located in a homogeneous host material causes certain frequencies to be completely reflected by the structure. In conjunction with creating a phononic band gap, anomalous dispersion accompanied by a large reduction in phonon group velocities can lead to a massive reduc...

Lie point symmetry analysis is performed for an unsteady nonlinear heat diffusion problem modeling thermal energy storage in a medium with a temperature-dependent power law thermal conductivity and subjected to a convective heat transfer to the surrounding environment at the boundary through a variable heat transfer coefficient. Large symmetry groups are admitted even for special choices of the...

a simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. we found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency thz qcls.in low frequenc...

Ru=O complexes have been demonstrated to be competent oxidants for oxidation of saturated hydrocarbons and epoxidat ion of alkenes . Photoexcitation of transdioxoosmium(V1) gives rise to super-oxidizing complexes having EO >2.2 V vs. n.h.e.. Some cationic RuZN and OsZN complexes are good model system for study of the mechanism of metalcatalysed oxidation of ammonia to nitrite and activation of ...

Due to interfacial phonon scattering and nanoscale size effect, silicon/germanium (Si/Ge) superlattice nanowire (SNW) can have very low thermal conductivity, which is very attractive for thermoelectrics. In this paper, we demonstrate using molecular dynamics simulations that the already low thermal conductivity of Si/Ge SNW can be further reduced by introducing hierarchical structure to form Si...

Nanoporous silicon powder was produced via efficient magnesiothermic reduction. In this work, the thermal effect and reduction process time were investigated on the porous silicon structure. The nanoporous silicon powders were characterized by  X-ray diffraction analysis and field emission scanning electron microscopy. The results demonstrate that porous structure was changed to homogeneous and...