A5029713844- Fluid Dynamics and Heat Transfer
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat of Formation Molybdenum Dioxide and Trioxide1Bernard A. Staskiewicz, James R. Tucker, Paul E. SnyderCite this: J. Am. Chem. Soc. 1955, 77, 11, 2987–2989Publication Date (Print):June 1, 1955Publication History Published online1 May 2002Published inissue 1 June 1955https://pubs.acs.org/doi/10.1021/ja01616a015https://doi.org/10.1021/ja01616a015research-articleACS PublicationsRequest reuse permissionsArticle Views436Altmetric-Citations12LEARN...
[1.1.1]Propellane, a compound whose structure includes two saturated carbons in which all four bonds are directed into single hemisphere, is of theoretical interest, but has also seen recent practical applications. Mono-, di-, and trisubstituted derivatives this propellane (by substitution its CH2 bridges with O, S, NH, CF2, CO, SO, SO2) remain unknown despite several computational studies that have suggested some may be stable. In study, we show that, cases, substituted propellanes...
The X-Ray and Cryogenic Facility (XRCF) at Marshall Space Flight Center is the world's largest x-ray optic calibration facility NASA's premier cryogenic optical test facility. Built specifically to calibrate Chandra telescope, contributed several other missions until 2005 when it became dedicated normal incidence testing temperatures. Recently facility's capability has been returned service updated. New beam monitors, focal plane detectors, article instrument positioning systems have added....
A novel technology on plate heat exchanger was introduced. Heat transfer and pressure loss were investigated with water flow through dimple herringbone as well R410A boiling condensing. Experiments three kinds of patterns (one plate, one normal plate) performed based given flux (6~14 kW/m2), comparatively. Test results single phase condenser showed that two plates have high efficiency low under same conditions capacity due to unique channel cell design. For evaporator application, the...
Composite materials often carry the reputation of demonstrating high variability in critical material properties. The JWST telescope metering structure is fabricated several thousand separate composite piece parts. stringent dimensional stability requirements on require thermal strain response every be verified either at billet or part level. a unique space that it has required manufacturing hundred billets cover many lots prepreg and years fabrication. flight expansion acceptance criteria...
This article explores the many forms of discrimination that have persisted in Alaska, resulting first generation voting barriers faced by Alaska Native voters, and two contested lawsuits it took to attain a measure equality for those voters four regions Alaska: Nick v. Bethel Toyukak Treadwell. In end, court’s decision came down comparison just pieces evidence: (1) Official Election Pamphlet English-speaking received was often more than 100 pages long; (2) single sheet paper language...
Biodegradable polymers are desirable to mitigate the environmental impact of plastic waste in environment. Over past several decades, development organocatalytic ring-opening polymerization (OROP) has made synthesis many new types biodegradable possible. In this research article, first example an oxygen atom transfer reagent pendant on a polymer backbone is reported. The monomers for polycarbonate sourced from 2,2-bis(hydroxymethyl) propionic acid molecule, and iodoaryl group installed...
NASA's Habitable Worlds Observatory will consist of a segmented telescope and high contrast coronagraph to characterize exoplanets for habitability. Achieving this objective requires an ultra-stable with wavefront stability picometers in certain critical modes. The NASA funded Ultra-Stable Large Telescope Research Analysis – Technology Maturation program has matured key component-level technologies 10 areas spanning "ultra-stable" architecture, including active components like segment edge...
In neuroblastoma, MYCN amplification is associated with survival rates of <50%. Overexpression the mitotic kinases Aurora‐A and Aurora‐B are also low exacerbate oncogenic effects N‐Myc. As N‐Myc stabilized by Aurora‐A, targeting proteolysis chimeras (PROTACs) have been developed that reduce levels. However, simultaneous degradation N‐Myc, has not previously achieved. Given contributions both Aurora to MYCN‐amplified we designed PROTACs capable degrading Aurora‐B. Dual‐degrading dAurAB2...
To achieve the ambitious goal of directly imaging exo-Earths with a coronagraph, future space-based astronomical telescopes will require wavefront stability several orders magnitude beyond state-of-the-art. The Ultra-Stable Large Telescope Research and Analysis – Technology Maturation (ULTRA-TM) program mature critical technologies for this new regime "ultra-stable optical systems" through component-level hardware demonstrations. This paper describes progress towards demonstrating...
Computer modeling and numerical simulation provide a valuable tool for designing guidelines towards successful routine experimentation with microwave sintering of ceramics. It is also expected that continued efforts in will lead to establishing procedures the scale up commercial utilization this new technology. We utilize finite-difference time-domain (FDTD) technique model various geometric arrangements material compatibility aspects ceramics multimode cavities. Simultaneous multiple...
To achieve the ambitious science goal of performing direct imaging earth-like exoplanets with a high contrast coronagraph, future space-based astronomical telescopes will require wavefront stability several orders magnitude beyond state-of-the-art. The Ultra-Stable Large Telescope Research and Analysis – Technology Maturation (ULTRA-TM) program is maturing key component-level technologies for this new regime "ultra-stable optical systems" through hardware testbeds that demonstrate component...