Solar-driven non-stoichiometric thermochemical redox cycling of ceria for the conversion of solar energy into fuels shows promise in achieving high solar-to-fuel efficiency. This efficiency is significantly affected by the operating conditions, e.g. redox temperatures, reduction and oxidation pressures, solar irradiation concentration, or heat recovery effectiveness. We present a thermodynamic ...

In this study, three-dimensional simulations of xenon plasma plume flow fields from a cluster of four Hall thrusters are performed with a hybrid particle-fluid method on unstructured meshes. In these simulations, a detailed fluid model is used to compute the electron properties, the direct simulation Monte Carlo method models the collisions of heavy particles and the Particle-In-Cell method mod...

PURPOSE To assess the efficacy of novel vitreous cutter blades compared with the regular guillotine by means of particle image velocimetry. Tested blades included a regular blade (RB) and newer designs where a circular (hole blade [HB]) or a slit aperture (slit blade [SB]) had been opened proximal to the cutting edge. METHODS Twenty-three-gauge probes were immersed in BSS or egg albumen, and ...

We designed a nonroller extra-corporeal circulation system (NRECC) to minimize space requirements and to improve the safety and ease of cardiopulmonary bypass. The NRECC includes a circuit, a centrifugal pump, and a vacuum regulator. The vacuum regulator has five channels, each of which can control negative pressure independently. Negative pressure is applied to suctions, a vent, and a venous r...

This paper shows the findings of a research carried out with Colombian pre-service science teachers. In particular, it points results derived from application Didactic Sequence which ties up Nature Science (Nos) along historical models Law Boyle, such as philosophical controversy about vacuum, interest for experimental vacuum production and, finally, design air pump and works Boyle pressure. It...

A new scheme is proposed that combines Autoregressive (AR) modelling techniques and pole-related spectral decomposition for the study of incipient single-point bearing defects for a vibration based condition monitoring system. Vibration signals obtained from the ball bearings from the High Vacuum (HV) and Low Vacuum (LV) ends of a dry vacuum pump run in normal and faulty conditions are modelled...

The rotary vacuum filter is very basic in design, application and operation. It is also an extremely effective solid/liquid separation device due to its unique methods of handling (discharging) formed cake solids, relatively low operating labor requirements and its ability to filter continuous or batch process flows. The rudiments of a rotary vacuum filter installation include (Figure 1): (1) t...

The Interaction Region Vacuum System in the PEPII B-Factory at SLAC must produce average pressures in the 10 Torr range. Low beamline pressures will minimize the background radiation encountered by the BaBar Detector. A combination of copper and stainless steel vacuum chambers with continuous antechambers are used to make up the beam tubes. Linear Non-Evaporable Getter (NEG) pumps are used to p...