Materials Literature
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We have measured the thermal conductance of a mechanical heat switch actuated by a piezoelectric positioner, the PZHS (PieZo electric Heat Switch), at cryogenic temperatures. The thermal conductance of the PZHS was measured between 4 K and 10 K, and on/off conductance ratios of about 100-200 at lowest and highest meas…
We present the fabrication and characterization of novel RF switches based on Ge2Sb2Te5(GST) phase change material. Such ohmic devices show non-volatile switching with resistivity changes up to 105as the material is transforming between the amorphous and the crystalline state by either applying a voltage pulse or dire…
In vacuum, insulators acquire charge due to well-known Secondary Electron Emission Avalanche (SEEA), and the charge is considered harmful for the insulation of high voltage vacuum devices. This paper deals with the charge depression effect of a shieldring, a ring type electrode, which is often applied to high voltage…
A positional resolution of space charge measurement system of a pulsed electro acoustic (PEA) method is tried to improve using a newly designed upper electrode unit and a new pulse generator. The improved upper electrode unit with a good terminator contribute to reduce the inductance and it results in reduce a noise.…
Three new acylated R1-barrigenol triterpene glycosides, 1-3, were isolated from the seeds of Pittosporum angustifolium Lodd. together with four known glycosides, 4-7, containing R1- and A1-barrigenol backbones. On the basis of spectroscopic, spectrometric, and chemical analyses the novel compounds were named pittangre…
We report GeTe-based phase change material RF switches with on-state resistance of 0.07 ohm*mm and off-state capacitance of 20 fF/mm. The RF switch figure-of-merit, Ron*Coffis comparable to RF MEMS ohmic switches. The PCM RF shunt and series switches were fabricated for the first time in a lateral FET configuration to…
As the thinnest material of the carbon family, reduced graphene oxide (r-GO) composites exhibit highly efficient EMI shielding at elevated temperatures, attributed to the high carrier mobility coupled with abundant residual groups in/on the r-GOs, as described by W. Wang, H. Jin, M. Cao, and co-workers on page 3484. M…
The susceptibility of MAX phases to thermal dissociation at 1300-1550 °C in high vacuum has been studied using in-situ neutron diffraction. Above 1400 °C, MAX phases decomposed to binary carbide (e.g. TiCx) or binary nitride (e.g. TiNx), primarily through the sublimation of A-elements such as Al or Si, which results i…
A functional polycation nanonetwork was developed for delivery of water soluble chemotherapeutic agents. The complexes of polyethyleneimine grafted methoxy polyethylene glycol (PEI-g-mPEG) and Zn(2+) were utilized as the micellar template for cross-linking with dithiodipropionic acid, followed by an acidic pH dialysis…
The insulation performance of an oil-immersed power transformer against lightning surges is verified by applying a lightning impulse (LI) voltage alone. However, the surge voltage generated at the transformer terminal in an actual system is superimposed over the ac operating voltage. Particularly for UHV- and 500 kV-c…
The discovery in 1987 of stable quasicrystals in the Al-Cu-Fe system was soon exploited to patent specific coatings that showed reduced friction in ambient air against hard antagonists. Henceforth, it was possible to develop a number of applications, potential or commercially exploited to date, that will be alluded to…
Nanoparticles can be involved in biological activities such as apoptosis, angiogenesis, and oxidative stress by themselves. In particular, inorganic nanoparticles such as gold and silica nanoparticles are known to inhibit vascular endothelial growth factor (VEGF)-mediated pathological angiogenesis. In this study, we s…
The emission behavior of C-doped ZnO films, which were prepared by implantation of carbon into ZnO films, is investigated. Orange/red emission is observed for the films with the thickness of 60–100 nm. However, the film with thickness of 200 nm shows strong green emission. Further investigations by annealing bulk ZnO…
We present high-performance temperature sensors which utilize spray deposited carbon nanotube (CNT) films as the active sensing material. In order to evaluate device performance, the change in device resistance with respect to change in temperature is monitored. The fabricated sensors show very good electrical respons…
An investigation of direct drive capsules with different shell thicknesses and gas fills was conducted to examine the amount of shock induced (Richtmyer-Meshkov) mix versus Rayleigh-Taylor mix from deceleration of the implosion. The RAGE (Eulerian) code with a turbulent mix model was used to model these capsules for n…
This paper has presented molecular dynamics calculations of the diffusion coefficients of interstitials, vacancies, and vacancy complexes of oxygen and uranium in UO 2 , as well as the coefficients of ion diffusion provided by these defects. The interatomic potentials have been chosen by comparing the defect formation…
Strain-hardening and warm deformation behaviors of extruded Mg–2Sn–0.5Yb alloy (at.%) sheet were investigated in uniaxial tensile test at temperatures of 25–250 °C and strain rates of 1 × 10−3 s−1–0.1 s−1. The data fit with the Kocks–Mecking type plots were used to show different stages of strain hardening. Besides II…
In this paper, we report a novel chemical doping technique to reduce the contact resistance (Rc) of transition metal dichalcogenides (TMDs) - eliminating two major roadblocks (namely, doping and high Rc) towards demonstration of high-performance TMDs field-effect transistors (FETs). By using 1,2 dichloroethane (DCE) a…
In this paper, an simply ion charge transport model is proposed, compared with bipolar charge transport model. It consists of ion generation by field assisted dissociation of impurities, transport, trapping and recombination in polymer. To simplify the model, it is assumed that only one type of impurity existing in po…
The dielectric properties of two amine cured bisphenol-A epoxy resin systems, Araldite CY1301 and Araldite CY1311 have been characterized using dielectric spectroscopy over the frequency range 1 mHz to 100 kHz. These two epoxy resin systems were chosen to allow the dielectric response to be studied from above and belo…