Single point incremental forming is used for rapid prototyping of sheet metal parts. This forming technology was applied to the fabrication of thin shell micropyramids of aluminum, stainless steel, and titanium foils. A single point tool used had a tip radius of 0.1 mm or 0.01 mm. An ultrasonic spindle with axial vibration was implemented for improving the shape accuracy of micropyramids formed...

Introduction: The velocity distribution of impact ejecta from regolith-like target has been investigated in laboratory for nearly three decades. For the case of vertical impact, the ejecta velocity distribution is determined experimentally and given by a power-law with an exponent of –1.22 [1]. There is an upper limit to the ejecta velocity (Hartmann cutoff velocity) that depends on impact velo...

A square sheet of aluminum foil is considered 2-dimensional because its mass is proportional to its diameter to the power of 2. A solid aluminum sphere is considered 3-dimensional because its mass is proportional to its diameter to the power of 3. An aluminum wire is considered 1dimensional because its mass is proportional to its length. The mass is proportional to length to the power of 1. Fro...

A local hospital was interested in shielding some sensitive equipment and contemplated installing a shielded room. The room under consideration was the typical laminated wood core panel with galvanized steel on both surfaces, with a RF shielded door, honeycomb air vent panels and filters for ac power, telephone and any other signals, meeting the shielding effectiveness requirements of MIL-STD-2...

This study compared Mallinckrodt® Laser-FlexTM with polyvinyl chloride endotracheal tubes (ETTs) wrapped with aluminum foil tape, copper foil tape, or Merocel® Laser-Guard laser-resistant wrap to determine ifspecular reflection occurred during exposure to a carbon dioxide (co2) laser. The ETTs were straightened and centered within cardboard cylinders and exposed to a laser set at 25 W for a max...

the increase of cell temperature with increased irradiance is probably the mostsignificant disadvantage of using photovoltaic modules equipped with booster reflectors. the aimof this study is to investigate the possibility of improving the performance of a photovoltaic waterpumping system by using a booster reflector and to keep the temperature of pv panels at a lowlevel by cooling pv panels wi...

Submicron-sized airborne particulate matter (PM) is not collected well on regular quartz or glass fiber filter papers. We used a micro-orifice uniform deposit impactor (MOUDI) to fractionate PM into 6 size fractions and deposit it on specially designed high-purity thin aluminum disks. The MOUDI separated PM into fractions 56–100, 100–180, 180–320, 320–560, 560–1000, and 1000–1800 nm. Since the ...

The foils laminate approach can be implemented to grow bi-directional porous pattern from both the top and bottom surfaces of an aluminum foil. It was intuitively inferred that leakage of etchant from the clamped area can be a feasible cause to have the upward pores grow in the notches of the unpolished surface. This leakage hypothesis has been disproved by the leakage blocking and triple layer...