Results 91 to 100 of about 245,160 (297)

Research at NASA on Human Response to Sonic Booms [PDF]

, 2008
NASA used its sonic boom simulator to study human response to shaped sonic booms and concluded that a loudness metric, such as Perceived Level, predicts human reaction to outdoor booms more accurately than overpressure.
Sullivan, Brenda M.
core   +1 more source

Genetic Mapping of Orofacial Traits Reveals a Single Genomic Region Associated With Differences in Multiple Parameters of Jaw Size Between Astyanax mexicanus Surface and Cavefish

Evolution &Development, EarlyView.
By performing a genetic association study in cave × surface fish F2 hybrids, we discovered that premaxilla width, dentary length, and maxillary length are all significantly associated with a region on Chromosome 13 containing 109 genes. ABSTRACT The regulation of bone size is a poorly understood and complex developmental process.
Amanda K. Powers, Alleigh Amaismeier, Kathryn Thiel, William Anyonge, Suzanne E. McGaugh, Tyler E. Boggs, Clifford J. Tabin, Joshua B. Gross   +7 more
wiley   +1 more source

Impact of reduced sonic boom exposure on introspective judgments and annoyance, pleasantness and loudness ratings for simulated booms presented in a realistic indoor environment

Acta Acustica
This paper reports on a project that quantified the effects of sonic boom exposure on human responses, in situations representative of the daily life of European citizens, to inform policy, and develop protection concepts for a new generation of ...
Marmel Frédéric, Cretagne Léo, Thuong Linh-Thao, Coulouvrat François, Fritz Claudia   +4 more
doaj   +1 more source

Some effects of Mach number and geometry on sonic boom [PDF]

Mach number and geometry effects on level of sonic boom overpressure and applicability of Whitham theory to calculation of sonic ...
Hicks, R. H., Hunton, L. W., Mendoza, J. P.   +2 more
core   +1 more source

Numerical Predictions of Sonic Boom Signatures for a Straight Line Segmented Leading Edge Model [PDF]

, 2012
A sonic boom wind tunnel test was conducted on a straight-line segmented leading edge (SLSLE) model in the NASA Langley 4- by 4- Foot Unitary Plan Wind Tunnel (UPWT). The purpose of the test was to determine whether accurate sonic boom measurements could
Cliff, Susan, Elmiligui, Alaa A., Thomas, Scott, Wilcox, Floyd J.   +3 more
core   +1 more source

Characterisation of a phylogenetically distinct PL25 family ulvan lyase from a seaweed biomass enriched metagenome

The FEBS Journal, EarlyView.
Ulvan is a polysaccharide available from green seaweed with beneficial properties for various applications. The full potential of ulvan requires enzymatic degradation of the polymer, thus producing ulvan oligosaccharides. This study expands the armoury of characterised ulvan lyases.
Andrius Jasilionis, Pavithra Sivakumar, Justyna M. Dobruchowska, Sune Fjermedal, Hörður Guðmundsson, Bjorn Thor Adalsteinsson, Guðmundur Ó. Hreggviðsson, Anne S. Meyer, Eva Nordberg Karlsson   +8 more
wiley   +1 more source

Feasibility study on conducting overflight measurements of shaped sonic boom signatures using the Firebee BQM-34E RPV [PDF]

A study was performed to determine the feasibility of establishing if a 'shaped' sonic boom signature, experimentally shown in wind tunnel models out to about 10 body lengths, will persist out to representative flight conditions of 200 to 300 body ...
Keefer, Thomas N., Jr., Maglieri, Domenic J., Sothcott, Victor E.   +2 more
core   +1 more source

Phycocyanobilin biosynthesis in Galdieria sulphuraria requires isomerization of phycoerythrobilin synthesized by bilin reductases

The FEBS Journal, EarlyView.
The biosynthesis of bilins, tetrapyrroles essential for light harvesting and sensing, is performed by specific enzymes (FDBRs). In Galdieria sulphuraria, both phycobiliprotein types bind phycocyanobilin, despite lacking the canonical synthesizing gene PCYA. Instead, PEBA and PEBB are encoded, producing phycoerythrobilin, proposed to be later isomerized
Federica Frascogna, Nathan C. Rockwell, Jana Hartmann, Julie M. Mudler, Nicole Frankenberg‐Dinkel   +4 more
wiley   +1 more source

Whatever Happened to Delia Derbyshire? Delia Derbyshire, Visual Art, and the Myth of her Post-BBC Activity

British Art Studies, 2019
The composer and musician Delia Derbyshire (1937–2001) joined the BBC Radiophonic Workshop in 1962 and by the end of the decade had made a major contribution to the British public’s awareness and understanding of electronic music.
David Butler
doaj   +1 more source

How loud is X-59’s shaped sonic boom?

5th International Conference on the Effects of Noise on Aquatic Life, 2019
NASA’s X-59 Quiet SuperSonic Technology low boom flight demonstrator aircraft is designed to produce a shaped sonic boom or “sonic thump” of 75 dB Perceived Level (PL) at the ground.
W. Doebler, J. Rathsam
semanticscholar   +1 more source