371,564 research outputs found
Wells futurologo
No full textUna lettura critica del saggio di H.G Wells "La scoperta del futuro" con cui l'autore di letteratura di fantascienza definisce i caratteri di una nuova disciplina che alcuni decenni più tardi si sarebbe chiamata Futurologia.A critical reading of the essay by H.G Wells "The discovery of the future" with which the author of science fiction literature defines the characteristics of a new discipline that a few decades later would be called Futurology
S. Wells letter to Thomas Rotch, 12 October
No full textS. Wells mentions "Rachel," presumably Rachel Todd, a close friend who resided in Farmington with her physician husband, Eli Todd. S Wells writes that his fever is slowly abating. Quite possibly he fell victim to the numerous epidemics carried by returning sailors to port cities such as Boston, Newport, Philadelphia and New Bedford. 7.6" x 9.4" (19.4 by 23.8 cm
Wells Cathedral, north-west view
No full text'WELLS CATHEDRAL NORTH WEST VIEW. E. T. Dolby, del. et lith. Published by S. Backhouse, Wells. Day & Son, Lithrs. to the Queen.
Wells Cathedral, south-east view
No full text'WELLS CATHEDRAL SOUTH EAST VIEW. E. T. Dolby, del. et lith. Published by S. Backhouse, Wells. Day & Son, lithrs. to the Queen'
Other title: On verso: Eastern division of the United States : designed to accompany Cornell's high school geography
No full textRelief shown by hachures.; Prime meridians: Greenwich and Washington.; Verso map drawn by E. Wells. 26 x 32 cm.; Probably issued in: Cornell's Companion atlas to Cornell's High school geography / Sarah S. Cornell. New York : D. Appleton and Co., 1856
Root zone salinity management using fractional skimming wells with pressurized irrigation: Inception report
No full textWells / Aquifers / Pumping / Groundwater irrigation / Water quality / Salinity control / Irrigation programs / Climate / Waterlogging / Drainage / Soils / Land use / Cropping systems / Farm income
[Letter from Nina S. Wells to Carolyn Street Scott, June 14, 1935]
No full textLetter from Nina S. Wells to Carolyn Street Scott, June 14, 1935, thanking Mrs. Scott for her help in establishing the local public library
Laddie : a ballad with piano accompaniment / by Harmon S. Bassett and Karolyn Wells Bassett.
No full textFor voice with piano accompaniment.Cover title.Words for tenor or baritone version: p. [2]Archived web conten
Graduate Recital: Lee Wells, organ
No full textMr. Wells is a student of Clyde Holloway.Sonate I, Paul Hindemith -- Prelude and Fugue in D Major, S 532, Johann Sebastian Bach -- Prélude, Fugue et variation, Op. 18, César Franck -- Prelude and Fugue on Bach, Franz Lisz
Spin relaxation and carrier recombination in GaInNAs multiple quantum wells
No full textElectron spin relaxation and carrier recombination were investigated in gallium indium nitride arsenide (GaInNAs) multiple quantum wells, using picosecond optical pulses. Pump-probe experiments were carried out at room temperature, using pulses produced by a Ti:sapphire pumped optical parametric oscillator.
The peak wavelengths of the excitonic resonances for the quantum well samples were
identified using linear absorption measurements, and were found to be in the range 1.25µm-1.29µm.
Carrier recombination times were measured for three samples of varying nitrogen content, and were observed to decrease from 548 to 180ps as nitrogen molar fractions were
increased in the range 0.45-1.24%. Carrier recombination times were also measured
for samples which had undergone a post-growth annealing process, and were found to be
signicantly shorter compared to times measured for as-grown samples.
Electron spin relaxation time was investigated for samples with quantum well widths in the range 5.8-8nm, and was found to increase with increasing well width, (i.e. decreasing quantum confinement energy), a trend predicted by both D'Yakonov-Kachorovskii and
Elliott-Yafet models of spin relaxation in quantum wells. In a further study, longer spin relaxation times were exhibited by samples containing higher molar fractions of nitrogen, but having nominally constant quantum well width. Spin relaxation times increased from 47ps to 115ps for samples containing nitrogen concentrations in the range 0.45-1.24%. Decreases in spin relaxation time were observed in the case of those samples which had been annealed post-growth, compared to as-grown samples.
Finally, all-optical polarisation switching based on spin relaxation of optically generated carriers in GaInNAs multiple quantum wells was demonstrated
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