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Up to now, it was believed, that the deterioration of vacuum insulation panels (VIP) thermal properties is primarily due dry gas and moisture permeation through its barrier envelope. The increase in internal pressure and the absorption of water on the large internal surface of the porous silica core deteriorates the thermal performance by inducing an increase in the thermal conductivity. Based on...
To explore the future application of diamond films coated by hot-filament chemical vapour deposition on tungsten carbide for lunar exploration, a comparative study of tribological behaviour of the film sliding in air and in vacuum under four different temperatures was conducted. Results showed that the coefficient of friction (COF) in air basically decreased with elevated temperature and, in vacuum,...
We present an experimental characterization of a new vacuum gauge based on a K type micro thermocouple with 25.4 μm diameter. This sensor is intended for the simultaneous measurement of the temperature and pressure in the ranges extending from 293 K to 400 K and 10 −1 Pa to 10 5 Pa respectively. The paper gives an investigation of the micro-thermocouple vacuum gauge signal for the...
The present work is aimed at developing gold nanostructures functionalized with antenna systems to exploit the synergistic nanostructure/antenna desorption-ionization efficiency. A potential Matrix-Assisted Laser Desorption Ionisation (MALDI) organic matrix has been modified introducing specific functional groups or molecular linker and used as a capping agent for gold nanostructures.In particular,...
Vacuum gauges that control fast processes in industrial applications, e.g. load locks, should immediately react to pressure changes. To study the response time of vacuum gauges to rapid pressure changes, a dynamic vacuum standard was developed where the pressure may change from 100 kPa to 100 Pa within 20 ms in a step-wise manner or within longer times up to 1 s in a predictable manner. This is accomplished...
A method for synthesis of large quantities of iron oxide nanowires using low purity substrates is presented. One cm thick commercially available iron plates of purity 98 at.% were supplied from a steel company. The plates prepared by hot rolling contained several μm thick surface oxide films formed during industrial processing. Plates were cut to small samples and exposed to highly dissociated oxygen...
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