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The thermal and mechanical properties of Lexan polycarbonate (PC) irradiated by 15 MeV proton and 40 MeV alpha particles with different fluencies have been investigated. The thermal decomposition temperature, thermal activation energy of decomposition, tensile strength, fracture strain, Young's modulus and average molecular weight of PC decreased after irradiation. The infrared spectroscopic results...
The alternating current (AC) conductivity and dielectric properties of the p-N,N dimethylaminobenzylidenemalononitrile (DBM) were investigated in the frequency range from 5 kHz to 2 MHz within the temperature range from 291 to 413 K. The temperature dependence of AC conductivity and the frequency exponent, s, is reasonably well interpreted by the correlated barrier hopping (CBH) model. The activation...
In this paper, spatial characteristics of dielectric barrier discharge (DBD) are analyzed using autocorrelation function (ACF) method. The filamentary, homogeneous and periodic discharge produced in a plate and mesh electrode, respectively, are quantitatively identified by analysis of the spatial structure of the discharge images in DBD with the ACF method. The influences of the size of the mesh electrode...
A closed circular transverse magnetic field is designed to control the spot motion of a cathodic arc on a large rectangular target. Stable and controllable spot motion is observed from both graphite and copper. The arc stability, spot velocity, and etched pattern on the cathode surface are studied systematically. Circular tracks are etched on the target surface by the repetitive spot movement and...
We report on the low temperature (≤1000 °C) vacuum sublimation behavior of e-beam evaporative deposited SiC film and a method to reduce the vacuum sublimation by an ion beam process. The density of SiC film deposited by e-beam evaporation method was ∼60% of the density of bulk source material. In this sample, we found that sublimation became appreciable above ∼750 °C under 1.5 × 10 −5 torr...
A gas cluster ion accelerator with energies up to 20 keV is described. Parameters of the main components of the equipment were determined. It was demonstrated that a pulse regime of the accelerator can be realized with a relatively low (500 l/sec) pumping speed of the cluster ion source. Conditions for stable cluster beam generation were found. In pulse mode ion clusters appear in the accelerated...
The morphology of tungsten tip (microsized monocrystal) adsorbed with Pt at coverages up to around 2 ML and subsequently annealed at temperatures ranging from 1000 K to 2100 K was studied using Field Emission Microscopy (FEM) technique. The sharpening of the [111] pole region was manifested by significant increase of field emission current density. This effect was observed for Pt coverages ranging...
The influence of the ozone-gas treatment on the performance of the fluorocarbon monomer on cotton fiber was investigated employing Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), water contact angle (WCA) and bending length (BL). FTIR results indicated that the ozone-gas pre-treatment oxidized the surface...
A miniature thrust stand in man-made vacuum environment, based on the principle of leaf spring bending deformation, capable of supporting testing of thrusters having a total mass of up to 300 g and producing thrust levels between 1 μN and 760 μN has been developed and tested. A case-study measurement was conducted for a Colloid Micro-Newton Thruster (CMNT) to investigate the feasibility of the proposed...
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