Volumetric Flow Rate Measurement using Surface Imaging Techniques

The purpose of our research is to validate an experimental method developed by Johnson and Cowen (2016) aimed at measuring volumetric discharge in an open channel using Surface particle image velocimetry (SPIV) combined with turbulent boundary layer analysis to infer the bathymetry and calculate volumetric flow rate, ultimately extending this work to natural systems (Hendrickson, 2020).

Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads

Engine research community interest in the Radio-Frequency corona-based ignition systems is currently gaining in importance mainly due to their capability to ensure robust combustion at challenging operating conditions such as very lean mixture and/or high EGR dilution. The benefits of Corona low-temperature plasma foster the early flame development thanks to combustion precursors production and to a more energetic and volumetric discharge, resulting in a larger amount of involved mixture. The corona discharge generates ionizing waves, named streamers, whose temporal and spatial variability in orientation, length and branching can affect the combustion onset and, therefore, the engine cycle-to-cycle variability. In this work, the discharge natural luminosity of a RF corona igniter, characterized by four tips electrodes, was recorded in an optically accessible engine via high-speed camera detection. A preliminary statistical analysis of the spatial and temporal streamer variability was performed by operating in motored conditions. Four different engine speeds and two different loads were explored in order to deeply investigate the streamer behaviour at diverse engine operating conditions. A comparison between a motored and a lean operating condition is also proposed to analyse, at a specific engine speed, the mixture influence on the streamers propagation before the start of the combustion.

Additive-free Li4Ti5O12 thick electrodes for Li-ion batteries with high electrochemical performance

Additive-free LTO ceramic anodes (thickness ∼500 μm) with high volumetric discharge capacity were prepared by powder extrusion moulding.

PERANCANGAN DAN ANALISIS PERFORMA POMPA HIDRAM UNTUK MEMENUHI KEBUTUHAN AIR BERSIH DI DUSUN BELANG TLOGOLELE SELO BOYOLALI

<p>This research aimed to: (1) determine the daily water needs of Belang population, (2) designing<br />hydram pump installation based on water needs and geographical conditions of Belang village, (3) study the<br />performance and efficiency of the hydram pump, (4) study the role of the hydram pump to fulfill the daily<br />water needs of Belang population. This study was based on Research and Development (R &amp; D). It<br />developed hydram pump installation to fit the topography of Belang village so it can work optimally. The<br />pump was tested by varying waste valve length at 20 mm, 25 mm, 30 mm and 35 mm; and waste valve ballast<br />at 0 grams, 250 grams, 500 grams and 750 grams. Data collection was performed three times for each<br />variation. Hidram pump performance was determined by the efficiency and the volumetric discharge of water<br />produced during the pump operation. Hydram pump was designed based on standard of the daily water<br />needs which reachs 13650 liters/ day for 195 Belang’s people. In this study, hydram pump has some<br />parameters. They are 4,5 meters of supply height, 80 meters of delivery height, 4 inches of pump body<br />diameter and 1 inch of delivery pipe. Based on the tests that have been conducted, the highest efficiency of<br />the hydram pump shown at 30 mm of waste valve length and 250 grams of waste valve ballast (η = 0.486652,<br />q = 6.746969 L / min). The maximum volumetric discharge was presented at 35 mm of waste valve length<br />and 750 grams of waste valve ballast (q =7.522211 L / min, η = 0.380989). Hydram pump performance<br />could fulfill the water needeed in Belang Village until medium term maintenance level. They could use the<br />water for drinking, cooking, bathing, washing, until cleaning home by 9750 liters/ day.</p>