A cylindrical cavity-receiver containing a tubular absorber that uses air as the heat transfer fluid is proposed for a novel solar trough concentrator design. A numerical heat transfer model is developed to determine the receiver’s absorption efficiency and pumping power requirement. The 2D steady-state energy conservation equation coupling radiation, convection and conduction heat transfer is ...

Although most people are thought to receive their highest acute exposures to gasoline while refueling, relatively little is actually known about personal, nonoccupational exposures to gasoline during refueling activities. This study was designed to measure exposures associated with the use of an oxygenated fuel under cold conditions in Fairbanks, Alaska. We compared concentrations of gasoline c...

UNLABELLED Trans-2-hexenal, a volatile aldehyde, is produced by soybean (Glycine max [L.] Merr) and other plants via the lipoxygenase pathway. In vitro tests showed it significantly (P < 0.001) reduced Aspergillus flavus germinating conidial viability at 10 μM, with approximately 95% viability reduction observed at 20 μM. The viability of nongerminated conidia was not reduced. To test the effec...

Tadpoles oiXenopus laevis Daudin can extract oxygen from both air and water. When these larvae have access to air, aerial oxygen uptake averages 16-6% of total oxygen consumption in normoxic water, and increases to 100% of net oxygen consumption in hypoxic water. Neither anaerobiosis nor increased buccopharyngeal ventilation occur in response to hypoxia. If tadpoles are prevented from surfacing...

Jet mixings of a coplanar alternating-lobe nozzle (CoALN), scarfing (ScALN), sword (SwALN), and chevron (SwChALN) were numerically investigated using three different far-field velocities to simulate the conditions pumping air intake stamping intake. It was confirmed that can be introduced increase cool involved in mixing for an infrared suppressor helicopter. found increases amount stream near ...

Our experiments on viscous fingering of air into oil contained between closely spaced plates reveal two selection rules for the fjords of oil that separate fingers of air. (Fjords are the building blocks of solutions of the zero-surface-tension Laplacian growth equation.) Experiments in rectangular and circular geometries yield fjords with base widths lambda(c)/2, where lambda(c) is the most un...

A previously perforated planar TEM specimen of silicon sample (8GLJH-060) was ion milled for 10s using two argon guns at an angle of 20°, 0.5mA per gun and a fixed voltage of 4kV. The time the specimen surface was in contact with air was minimized to 3min, by taking it out of the ion mill and putting it in the electron microscope airlock immediately afterwards. The silicon wafer was left in the...