Results 291 to 300 of about 560,386 (344)
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Clean rings of continuous functions
Algebra universalis, 2007A ring is clean if every element is the sum of a unit and an idempotent. Let $$ 1 \in A $$ be a dense local subring of the reals which is not a field. We show that the ring of A-valued continuous functions on a zero-dimensional space X is clean if and only if X ...
Anthony W. Hager, Chawne M. Kimber
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Cross‐Linked Enzyme‐Adhered Nanoparticles (CLEANs) for Continuous‐Flow Bioproduction
ChemSusChem, 2021AbstractNanostructured but micro‐sized biocatalysts were created by bottom‐up technology using multi‐functionalized silica nanoparticles (NPs) as nano‐sized building blocks to form cross‐linked enzyme‐adhered nanoparticles (CLEANs) as robust micro‐sized particles with beneficial internal structure and good mechanical properties.
Flóra Nagy +9 more
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A clean air continuous flow propulsion facility
28th Joint Propulsion Conference and Exhibit, 1992Consideration is given to a contaminant-free, high enthalpy, continuous flow facility designed to obtain detailed code validation measurements of high speed combustion. The facility encompasses uncontaminated air temperature control to within 5 K, fuel temperature control to 2 K, a ceramic flow straightener, drying of inlet air, and steady state ...
R. KRAUSS, J. MCDANIEL, JR.
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Analysis: California continues clean-car quest
Engineering & Technology, 2009One of Barack Obama's first actions as incoming US President could allow California to set its own limits on greenhouse gas emissions from vehicles.US Environmental Protection Agency (EPA) denied California's request for a waiver exempting it from the US Clean Air Act, which mandates limits on air pollution levels but currently not greenhouse gas ...
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Clean rooms: Continuing evolution of fan filter units for clean rooms
Filtration + Separation, 2011Rob Flaherty, International Sales Manager at Trion, explores the advantages of using FFUs in both large and small clean rooms and focuses on exciting, low-energy FFU developments.
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Mask cleaning strategies: a continuous ion removal concept
SPIE Proceedings, 2006Researchers have linked the occurrence of reticle haze to many parameters which include cumulative irradiation, the greater use of 193nm in low-k1 lithography, humidity and the presence of ammonium with other process contaminants. Published methods of contaminant reduction include 1) volatilization by thermal treatment 2) induced preemptive ...
Steve Osborne +2 more
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Clean Water Act Jurisdiction: The Saga Continues
Journal AWWA, 2009This article reviews the current state of recent Clean Water Act (CWA) jurisprudence and the U.S. Senate's efforts to change the law. The article also raises a variety of issues that if left unaddressed by the Senate legislation, may have dire consequences for efforts to protect the nation's waters.
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Continuous Cleaning of Heat Exchanger with Recirculating Fluidized Bed
Heat Transfer Engineering, 1987Fluidized bed heat exchangers for liquids have been studied in the United States, the Netherlands, and the Federal Republic of Germany. Between 1965 and 1970, fluidized bed heat exchangers were developed in the United States as brine heaters in seawater desalination.
JOCHEN St. KOLLBACH +2 more
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Continuous-wave laser cleaning of historic monuments and buildings
Annual Meeting Optical Society of America, 1985Current mechanical and chemical techniques for the conservation and cleaning of stone, although successful in many applications, are not always kind to underlying surfaces. This is a major consideration when cleaning delicate artwork. These techniques are often abrasive, caustic, onerous, and time-consuming.
Hugh Masterson +2 more
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Friedel–Crafts alkylation in supercritical fluids: continuous, selective and clean
Chemical Communications, 1998Continuous Friedel–Crafts alkylation of mesitylene, C6H3Me3, and anisole, C6H5OMe, with propene or propan-2-ol has been carried out in supercritical propene or CO2 using a heterogeneous polysiloxane-supported solid acid Deloxan® catalyst in a small fixed bed reactor (10 ml volume); 100% selectivity for mono-alkylated products with 50% conversion could ...
Martin G. Hitzler +4 more
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