Civil, Mechanical, & Industrial
A spray nozzle assembly includes a pressure dependent variable spray orifice and an internal chamber which is at least partially bound by a flexibly deformable...
A spray nozzle assembly includes a pressure dependent variable spray orifice and an internal chamber which is at least partially bound by a flexibly deformable sidewall. At its distal end, the sidewall terminates at a distal face defining the spray orifice extending therethrough.
A metering member extends distally from the internal chamber and through at least a portion of the spray orifice. As the pressure of a liquid supplied to the internal chamber by a liquid supply pathway varies, the flexibly deformable sidewall expands or contracts in response thereto. As the sidewall expands and contracts, the distal face moves relative to the metering member to change the effective size of the spray orifice.
This innovative system combines two remarkable technologies, power control and ripple cancellation, in a cost-effective package. This system optimizes the...
This innovative system combines two remarkable technologies, power control and ripple cancellation, in a cost-effective package. This system optimizes the performance of any switching power conversion device.
This invention is a new form of no-contact dust separation technology designed to clean very dusty or polluted air with little maintenance and low energy costs,...
This invention is a new form of no-contact dust separation technology designed to clean very dusty or polluted air with little maintenance and low energy costs, removing most of the harmful respirable particles smaller than 10 m.
The deduster is based on a dust separation theory, which states that any particles with a higher density than air can be separated in a uniflow centrifugal apparatus. With that stipulation and with recent advances in fluid dynamics and particle measurement technology, we have been able to develop a device than can clean large volumes of air quickly and efficiently. The device is adaptable: Different sizes of dedusters can be fabricated to fit a range of applications. Once the necessary flow rate of the deduster is determined, the proximate parameters of the deduster can be calculated with precision.
Chemical binders used in asphalt paved surfaces are subject to age hardening, resulting in increased stiffness over time, a major cause of...
Chemical binders used in asphalt paved surfaces are subject to age hardening, resulting in increased stiffness over time, a major cause of cracking and the subsequent need for re-surfacing. Over the last 40 years, treating the binders with some form of anti-oxidant (AOX) has shown some promise in reducing binder stiffness, but it still is prone to softening at higher temperatures, stiffening at lower temperatures or leaching out over time. To ensure long-term durability, a viable AOX treatment should remain dimensionally stable over a wide temperature range and be environmentally and occupationally safe to use.
Developed by a team of researchers at the University of Illinois at Urbana-Champaign in 2006, this revolutionary AOX binder treatment consists of three additives to base asphalt: aldehyde, thioester and a caltalyst. A condensation reaction of aldehyde with asphalt to form novolacs, which can act as antioxidants, results in a reduction of age-susceptible polar aromatics in the binder. The thioester serves as a secondary antioxidant, which is highly effective against oxidative degradation of hydrocarbons. Laboratory testing of over 40 binders at the University of Illinois showed that the AOXADUR-modified binder produces the lowest aging index the measurement of asphalt aging potential during service life. Further, the AOXADUR-modified binder showed a dramatic increase in high-temperature stiffness and a substantial decrease in low-temperature stiffness. This improvement in binder properties at both high and low temperatures results in less thermal stress and reduced cracking potential. Finally, the age-fighting characteristics of AOXADUR make it an appealing choice asphalt mixtures containing recycled asphalt pavement (RAP).
With AOXADUR, higher amounts of RAP material can be used, which can lead to a reduction in the amount of new aggregate and asphalt binder required per ton of mixture, leading to economic and environmental benefits and increased sustainability of the roadway materials.