A recent long-term comparison between the compensated multi-pole Linear Ion Trap Standard (LITS) and the laser-cooled primary standards via GPS carrier-phase time transfer showed a deviation of less than 2.7×10/day. A subsequent evaluation of potential drift contributors in the LITS showed that the leading candidates are fluctuations in background gases and the neon buffer gas. The current vacu...

This present work is focused firstly on an experimental investigation for the optimum design of water jet pumps to be used in hydrotransport solid particles through pipeline systems. Experiments were conducted a closed test loop using five types with various dimensions driving nozzle, suction mixing chamber, and diffuser employing as fluid. The efficiency each pump element was analyzed interpre...

This paper investigated thin films deposition processes of silica-like based on the injection liquid droplets in Atmospheric Pressure Plasma Jet–APPJ operated open air. An aerosol hexamethyldisilane is produced by a syringe-pump and injected nitrogen post-discharge for different precursor carrier gas flow rates. For high flow, this process enables to form without addition oxygen plasma phase. F...

A three-dimensional transient numerical model was developed to obtain the two-phase flow characteristics in a twin-screw multiphase pump based on dynamic mesh technology and model. The performance under different inlet gas volume fractions (IGVF) predicted by tested. Then, validated after comparing simulation experimental results. After that, field 10% IGVF analyzed. When is 10%, pressure incre...

conclusions intraperitoneal migration of a subfascially placed baclofen pump is a rare, yet serious complication, which has been reported only once in the literature. we advise neurosurgeons to have a low level of threshold in confirming the location of a baclofen pump with imaging and surgical exploration if necessary in order to avoid detrimental outcomes such as bowel perforation. case prese...

The use of pumps linked in parallel or series in large scale pipe systems is usually inevitable, to meet the required head and discharge. Transient flow occurs following a pump failure in a pump group as a result of variations in the flow rate. This research is an investigation about waterhammer caused by one or more pump-switch off in a pump group when they are connected in parallel. The opera...

Using of nanofluids and ducts with corrugated walls are both supposed to enhance heat transfer, by increasing the heat transfer fluid conductivity and the heat transfer area respectively. Use of a diverging duct with a jet at inlet section may further increase heat transfer by creating recirculation zones inside the duct. In this work two-dimensional incompressible laminar flow of a nanofluid e...

numerical study has been carried out for slot air jet impingement cooling of horizontal concentric circular cylinders. the slot air jet is situated at the symmetry line of a horizontal cylinder along the gravity vector and impinges to the bottom of the outer cylinder which is designated as θ=0°. the outer cylinder is partially opened at the top with width of w=30mm and is kept at constant tempe...