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Full-Text Articles in Mechanical Engineering
Geometrical Modeling Of Fibrous Materials Under Compression, Benoit Maze, Hooman Vahedi Tafreshi, Behnam Pourdeyhimi
Geometrical Modeling Of Fibrous Materials Under Compression, Benoit Maze, Hooman Vahedi Tafreshi, Behnam Pourdeyhimi
Mechanical and Nuclear Engineering Publications
Many fibrous materials such as nonwovens are consolidated via compaction rolls in a so-called calendering process. Hot rolls compress the fiber assembly and cause fiber-to-fiber bonding resulting in a strong yet porous structure. In this paper, we describe an algorithm for generating three dimensional virtual fiberwebs and simulating the geometrical changes that happen to the structure during the calendering process. Fibers are assumed to be continuous filaments with square cross sections lying randomly in the x or y direction. The fibers are assumed to be flexible to allow bending over one another during the compression process. Lateral displacement is not …
An Electrospray-Based, Ozone-Free Air Purification Technology, Gary Tepper, Royal Kessick, Dmitry Pestov
An Electrospray-Based, Ozone-Free Air Purification Technology, Gary Tepper, Royal Kessick, Dmitry Pestov
Mechanical and Nuclear Engineering Publications
A zero-pressure-drop, ozone-free air purification technology is reported. Contaminated air was directed into a chamber containing an array of electrospray wick sources. The electrospray sources produce an aerosol of tiny, electrically charged aqueous droplets.Charge was transferred from the droplets onto polar and polarizable species in the contaminated air stream and the chargedcontaminants were extracted using an electric field and deposited onto a metal surface. Purified air emerged from the other end of the chamber. The very small aqueous electrospray droplets completely evaporate so that the process is essentially dry and no liquid solvent is collected or recirculated. The air purification …
Stream Ambient Noise, Spectrum And Propagation Of Sounds In The Goby Padogobius Martensii: Sound Pressure And Particle Velocity, Marco Lugli, Michael L. Fine
Stream Ambient Noise, Spectrum And Propagation Of Sounds In The Goby Padogobius Martensii: Sound Pressure And Particle Velocity, Marco Lugli, Michael L. Fine
Biology Publications
The most sensitive hearing and peak frequencies of courtship calls of the stream goby, Padogobius martensii, fall within a quiet window at around 100Hz in the ambient noise spectrum. Acoustic pressure was previously measured although Padogobius likely responds to particle motion. In this study a combination pressure (p) and particle velocity (u) detector was utilized to describe ambient noise of the habitat, the characteristics of the goby’s sounds and their attenuation with distance. The ambient noise (AN) spectrum is generally similar for p and u (including the quiet window at noisy locations), although the energy distribution of uspectrum is …