about internal defects within the insulation. The index k is defined as the proportionality constant between the changes at high voltage of capacitance ∆C and of the dissipation factor ∆tanδ . ∆C and ∆tanδ values were highly correlated when small flat defects were within the insulation and that correlation was lost in the presence of large narrow defects like electrical treeing. The discriminat...

The purpose of this study was to compare rheological properties of six dental interocclusal recording materials and to investigate the effect of temperature on the rheological properties during setting. Five polyvinylsiloxane materials and one polyether material were investigated in this study. The strorage modulus (G') and the loss factor (tanδ) were measured from 30s after mixing during setti...

Nanostructured Ni-Zn ferrite (NZF) thin films, deposited by a CMOS-compatible microwave-assisted solvothermal deposition (MAS-D) process, exhibit ‘far-from-equilibrium’ distribution of cations in the spinel structure, and thus, exciting magnetic properties. Solvents with different dielectric loss-tangents, such as ethanol (tanδ≈0.94), 1-decanol (tanδ≈0.1), benzyl alcohol (tanδ≈0.67), were mixed...

The CuO modified (Na0.52K0.48)NbO3 (NKN) piezoelectric ceramics were prepared by a solid-state reaction method. On the one hand, CuO doping can improve the densification behavior and simultaneously promote the grain growth, however, has little effect on the Curie temperature. On the other hand, the mechanical quality factor Qm obviously increases, the dielectric loss tanδ decreases, and the pie...

The wood used in making musical instruments usually undergoes pre-treatments or conditioning. Some processes have resulted from laboratory research, while many treatments are applied by craftsmen using traditional methods that have not yet been scientifically assessed. This paper is based on laboratory methods which simulate hydrothermal pre-treatments traditionally applied by Iranian lute make...

The objective of this study was to determine rheological behaviors of maple veneer plastic composite (MVPC) prepared by full cell preparation technology through the use of a rotational rheometer. The results showed that at 25 to 105 °C, the storage modulus G' and loss modulus G'' of the MVPC were apparently higher than that of the control. In the range 105 to 210 °C, the storage modulus G' of t...

Mixed surimi gels with 5 and 8% of pea flour (PF) 1.41% protein isolate (PPI) were made to replace part the myofibrillar proteins legume compounds. Viscoelastic properties in linear viscoelastic range fresh mixed control gel compared frozen-stored for one year. Fresh PPI-surimi more flexible (higher γmax), greater energy stability E parameter) strength G′ G″ moduli) than gel. These sustained af...

Sulphur can be present in mineral insulating oil and manifest stable, highly reactive corrosive form. The sulphur reacts with the copper conductor transformer forms semi conductive sulphide at surface of conductor. paper insulation used on may get damaged due to sulfide deposits which also affect partial discharge activities prevalent paper-oil insulation. model is studied online measurement Di...

In this paper, we study a Dielectric Resonator Antenna of cylindrical shape with circular polarization for applications in the C band. The proposed antenna is composed of two different layers. The first is Polyflon Polyguide with relative permittivity εr1 = 2.32 and a loss tangent tanδ = 0.002 as a lower layer. The second is Rogers RO3010 with relative permittivity εr2 = 10.2 and a loss tangent...