238,059 research outputs found
Walter P Fuller & Wells Art Studio
No full textWalter P. Fuller & Wells Art Studio. Walter P. Fuller is standing on the steps of the house where he was born. Walter P. Fuller was the author of St. Petersburg and its people [1972] It was the Wells Art Studio (1322 4th Avenue West) in January 1972
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
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
William A. McGaw
No full textTypescript of a biographical sketch of William A. McGaw, written by Wells R. McBride for the Ogden Standard in 1929, and copied by Virginia P. Howell in 1938. McGaw was born in Ogden, Utah in 186
Petroleum Well Location Map of Wells County, Indiana Showing Well Status, Total Depth of Wells, Petroleum Field Boundaries, and Petroleum Pipelines
No full textPetroleum Well Location Map Wells P
Introduction: action, reaction, interaction in historical animal studies
No full textNo abstract available
Coupled Quantum Wells
No full textProperties of quantum-well (QW) structures have proved useful in providing enhanced device characteristics and even in generating new device applications. This book presents a theory needed to understand the properties of QW structures, as well as the rules employed in the design of photodetectors based on QWs. A theoretical model is presented evaluating gain from the QW structure based on IV-VI semiconductor materials. The experimental and theoretical results concerning coupled QW structures are discussed. Semimagnetic quantum wells attract great attention due to potential device application in the field of spintronics. A study of three groups of semimagnetic structures is presented. Magnetoexcitons dispersion in coupled quantum wells are discussed using the Bethe-Salpeter formalism. Also presented are: high-resolution electron energy loss spectroscopy measurements on surface plasmon dispersion in systems exhibiting quantum well states; a review of different ways to achieve a spin splitting of two-dimensional electron and hole sub-bands; a review of two approaches to the quantisation of the particle motion in an infinite square; a study of the different disordered electron systems with various disorder strengths; and a study of quantum states of Double Quantum Wells and hydrogen-like molecules. An optical gain using the new material system InGaAsN for the operation of QW based semiconductor lasers is evaluated as well.Show more Show less</p
Dataset for 'Understanding the mechanochemical synthesis of the perovskite LaMnO3 and its catalytic behaviour'
No full textDataset supports the publication 'Understanding the mechanochemical synthesis of the perovskite LaMnO3 and its catalytic behaviour' by Rachel H. Blackmore, Maria Elena Rivas, Tugce Eralp Erden, Trung Dung Tran, Huw R. Marchbank, Dogan Ozkaya, Martha Briceno de Gutierrez, Alison Wagland, Paul Collier and Peter P. Wells, published in Dalton Transactions. This paper describes an in-depth in-sight into the mechanochemical synthesis of LaMnO3 using X-ray absorption spectroscopy (XAS) and the improved performance of ball milled materials towards the decomposition of N2O
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Oecetis litua Wells 2006, sp. nov.
No full textOecetis litua sp. nov. Figures 27–29, 65 Material examined: Holotype. Male, 12°40'S, 132°53'E, Jabiru, Town Lake, 30 May 1991, Wells and Webber (ANIC). Paratypes. NT: 46 males, 9 females, East Alligator R. at Cahill's Crossing, Wells and Suter, 27 May 1988 (NMV). Other material. NT: 2 males, 12°17'S, 133°20'E, Cooper Creek, 11 km SW of Nimbuwah Rock, 3–4 Jun 1973, J.C. Cardale (ANIC); 3 male, 3 females, 12°06'S, 133°04'E, Cooper Creek, 19 km SE of Mt Borrodaile, 5–6 Jun 1973, J.C. Cardale (ANIC); 1 male, 12°25'S, 132°58'E, 1 km of Cahills Crossing (East Alligator R.), 7–8 Jun 1973, J.C. Cardale (ANIC); 3 males, 12°52'S, 132°50'E, Koongarra, 15 km E of Mt Cahill, 12–13 Jun 1973, J.C. Cardale (ANIC); 1 male, 12°52'S, 132°47'E, Nourlangie Creek, 8 km E of Mt Cahill, 14–15 Jun 1973, J.C. Cardale (ANIC); 2 males, 12°57'S, 132°33'E, Jim Jim Creek, 19 km WSW of Mt Cahill, 17 Jun 1973, J.C. Cardale (ANIC); 1 male, 1 female, 15°58'S, 136°21'E, 12 km NNE of Borroloola, 1 Nov 1973, J.C. Cardale (ANIC); numerous males, females, Katherine R. Gorge Nat. Pk, 13 Aug 1979, J. Blyth (NMV); numerous males, females, Adelaide R., 15 km E of Stuart Highway, 15 Aug 1979, J. Blyth (NMV); 5 males, 1 female, South Alligator R., UDP Falls [Gunlom], 7 Sep 1979, J. Blyth (NMV); 5 males, junction of Arnhem Highway and Oenpelli Rd, 26–27 Jun, 1980, M.B. Malipatil (NMV); 2 males, UDP Falls [Gunlom], 18–19 Jul 1980, M.B. Malipatil (NMV); 2 males, ARRS, South Alligator R. at Gimbat OSS Station, 28 Apr 1988, P. Dostine (NMV); 1 male, Magela Creek, Stoned Billabong, 15 May 1988, Wells and Suter (NMV); 2 males 3 females, ARRS, Radon Springs, 18 May 1988, A. Wells and P. Suter (NMV); 3 males, Coonjimba Billabong, 19 May 1988, P. Suter and A. Wells (NMV); 1 male, Magela Creek at Ranger pipe outlet, 20 May 1988, A. Wells and P. Suter (NMV); 1 male, ARRS, Ranger Mine RP1, 20 May 1988, A. Wells and P. Suter (NMV); 2 males, Magela Creek at Ranger pipe outlet, 23 May 1988, A. Wells and P. Suter (NMV); 1 male, 1 female, ARRS, South Alligator R. below Fisher Creek junction, 24 May 1988, A. Wells and P. Suter (NMV); 2 males, ARRS, South Alligator R. at Gimbat OSS Station, 24 May 1988, A. Wells and P. Suter (NMV); 2 males, South Alligator R. below BHP camp, 25 May 1988, P. Suter and A. Wells (NMV); 1 male, 1 female, South Alligator R., 14 Jun 1988, P. Dostine, site 1 (NMV); 2 males, 12°36'S, 132°53'E, ARRS Gulungul Creek, inlet to Gulungul Billabong, 20 Apr 1989, A. Wells and P. Suter (NMV); 1 male, Litchfield National Park, Florence Falls, 9 Apr 1991, Horak, Wells and Upton (NTM); 1 male, 12°42'S, 130°58'E, Berry Springs, 9 Apr 1991, Wells and Horak (NTM); numerous males, females, 12°42'S, 132°57'E, Kakadu National Park, Magela Creek, OSS Site 009, 24 Apr 1991, Wells and Webber (NTM); 1 male, Little Baroalba Creek, 25–26 Apr 1991, Wells and Webber (NTM); 4 males, 1 female, Jabiru Town Lake, 13 May 1991, C. Humphrey (ANIC); 1 male, Jabiru Town Lake, 30 May 1991, Wells and Webber (NMV); 1 male, 1 female, 12°48'S, 132°49'E, Kakadu National Park, Baroalba Springs, 16 Aug 1992, Wells and Webber (NTM); 1 male, 13°16'S, 132°49'E, Kakadu National Park, Jim Jim Falls, camp site, 13 Aug 1996, I. Edwards (NMV). WA: 2 males, Drysdale R. National Park via Carson R. Station, 14°37'S, 125°56'E, 31 Aug 1996, I. Edwards (NMV); 2 males, 1 female, Drysdale R. Crossing, Kalumbaru Rd, 15°42'S, 126°22'E, 28 Aug 1996, I. Edwards (NMV). Qld: numerous males, females, Palmer R., 20 Jun 1971, E.F. Riek (ANIC); 1 male, Mulgrave R., W of Gordonvale, 29 Apr 1979, A. Wells (NMV). Diagnosis. 1 of several Australian species with distinctively spotted wings that give a somewhat moth-like appearance. In general appearance resembling O. hemerobioides McLachlan, 1866 and O. dostinei Wells, 2004, but distinguished from those 2 laustra -group species by having males with stout inferior appendages, and the phallus with a slender internal paramere. Description. Male. Wings of typical shape, without scales, but with pattern of spots, and long downy hair on veins. Anterior wing length 5.7–6.0 mm. Abdominal segment IX narrow mid-ventrally, with pronounced lateral lobes, segment X broad-based, triangular in dorsal view, slender, tapered in lateral view. Genitalia, see figs 27–29. Pre-anal appendages rounded apically. Phallus stout, short; aedeagus membranous with a sclerotised band apically forming a sharp ʻbeakʼ in lateral view; paramere slender, in lateral view strongly curved, slightly sinuous in dorsal and ventral view. Inferior appendages stout at base, the mesial ventral margins closely adpressed for 1st half length, then abruptly excavated such that the appendages taper to conical lobes distally; in lateral view quite irregular in shape, broadest medially; dorsal pouch reduced to an angled row of stout setae in basal part of appendage. Figures 25, 26, Oecetis geniculata sp. nov., male genitalia in ventral and dorsal views. Figures 27–29, Oecetis litua sp. nov., male genitalia in ventral, lateral and dorsal views. Figures 30–32, Oecetis jenniae sp. nov., male genitalia in dorsal, ventral and lateral views. Figures 33, 34, Oecetis mouldsi sp. nov., male genitalia in ventral and lateral views. Figures 35, 36, Oecetis theischingeri sp. nov., male genitalia in ventral and lateral views. Figures 37–39, Oecetis australis (Banks): 37, male genitalia in ventral view; 38, forewing; 39, downy hair on wing veins. Distribution. Known from the north of NT and northern Qld, and from 1 sample from northern WA. Remarks. Within the pechana -group, this species is distinctive in its wing pattern and colouration. Yet the paramere and vestiges of the basi-dorsal pocket on the inferior appendages, clearly place it with other pechana -group species. Etymology. The name is derived from the Latin — lituus, a curved staff, being descriptive of the paramere of the phallus in lateral view.Published as part of Wells, Alice, 2006, A review of Australian long-horned caddisflies in the Oecetis pechana-group (Trichoptera: Leptoceridae), with descriptions of thirteen new species, pp. 107-128 in Memoirs of Museum Victoria 63 (2) on pages 117-120, DOI: 10.24199/j.mmv.2006.63.13, http://zenodo.org/record/806496
Methanol oxidation over shell-core MO<sub>x</sub>/Fe<sub>2</sub>O<sub>3</sub> (M = Mo, V, Nb) catalysts
No full textWe present a comparison of Mo, V and Nb oxides as shell materials atop haematite cores used for selective methanol oxidation. While Mo and V both yield high selectivity to formaldehyde, Nb does not. Very different reactivity patterns are seen for Nb, which mainly shows dehydrogenation (to CO) and dehydration (to DME), indicating the lack of a complete shell, while Raman spectroscopy shows that the Mo and V formation process is not followed by NbOx. We suggest this is due to the large differences in mobility within the solid materials during formation, NbOx requiring significantly higher (and deleterious) calcination temperatures to allow sufficient mobility for shell completion.</p
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