Glass-ceramics containing pyroelectric Sr2TiSi2O8 (STS) crystals are produced from parent glasses of compositions STS + 0.8 SiO2 (0.2 − x) Na2O x CaO, with = 0; 0.05; 0.10; and 0.15. The aim this work is to investigate the effect additions stoichiometric composition on crystallization mechanisms piezoelectric properties glass-ceramic. DSC analyses evidence that glass transition temperatures Tg,...

Piezoelectric polymers represented by polyvinylidene fluoride (PVDF) possess many attractive attributes so they are widely used in electromechanical energy conversion devices. To further enhance the piezoelectric effect of PVDF, graphene and its derivatives have been added. A central issue is how added improves properties graphene/PVDF composites. Starting from consideration crystal phase trans...

A forward second-harmonic scattering method for determining the second-order susceptibility coefficients of ZnO nanorods on the order of 100 nm in diameter is presented. The long coherence length and strong intensity of the forward second-harmonic signal allow for a simple theoretical model to match the experimental measurements; this results in getting accurate values for the second-order susc...

According to a standard argument, higher income inequality fosters redistributive activities of the government in favor of the median income earner. This paper shows that if redistribution is achieved by a public provision of goods and services rather than by transfers, higher income inequality may imply a smaller size of the government in majority voting equilibrium. In addition to a static vo...

We analyze a model in which workers must be allocated to tasks to produce. There are differences among the workers in absolute ability that are independent of the activity they perform. We demonstrate a unique competitive equilibrium that determines both wages and the allocation of workers to tasks. The equilibrium wage has the property that workers assigned to the lowest ‘‘value-added’’ tasks ...

This study adopts a GNP function approach in order to examine the impact of migrant labour on domestic factors of production in the United Kingdom. We also examine the relationship between imports and migrants, which are two different facets of globalisation. We find that an increase in the number of unskilled migrants reduces the wages of unskilled domestic workers. However the quantitative im...

Abstract A novel piezoelectric energy generator embedded in vehicle brake pads and excited by magnetic repulsion is developed. The made of a cylindrical magnet stack. generators are mounted on the backing plate pad through perforated friction layer. Slotted rotor with magnets equipped to ensure braking performance vehicle. During process slotted rotor, dynamic will be generated when overlapping...

The effects of biaxial in-plane stress on the elastic, dielectric, and piezoelectric (PE) properties c-axis textured thin film wurtzite phase scandium aluminum nitride (w-ScxAl1−xN) alloys have been calculated with density functional perturbation theory. σR was kept below 1 GPa covering compressive tensile values applied to alloy supercells represented special quasi-random structures. An increa...