1,887 research outputs found
ELECTRONIC TRANSITION OF YOH IN THE VISIBLE REGION
No full textAuthor Institution: Department of Chemistry, University of British Columbia; Department of Chemistry, Lumbda Physik, Inc.Excitation spectra of the new molecules YOH and YOD have been recorded in the 500-625 nm wavelength region by laser-induced fluorescence, following reaction of laser-ablated yttrium with or under supersonic jet-cooled molecular beam conditions. Rotational analyses of bands near 540 nm at high resolution gave the following substitution structure for the ground state: Wavelength-resolved fluorescence spectra have given the ground state vibrational frequencies No evidence for the (OH stretch) mode was observed. Very complicated weak structure at the long wavelength end may possibly correspond to a singlet-triplet transition
Gluon shadowing in charmonium / bottonium production and J / psi suppression in nuclear collisions
No full textGupta S, Satz H. Gluon shadowing in charmonium / bottonium production and J / psi suppression in nuclear collisions. In: Albright CH, Kasper PH, Raja R, Yoh J, eds. The Fermilab Meeting DPF 92. Proceedings, 7th Meeting of the American Physical Society, Division of Particles and Fields, Batavia, USA, November 10-14, 1992. ..meeting of the American Physical Society, Division of Particles and Fields . Vol 7. Singapore: World Scientific; 1992: 1125-1134
AN UPDATE ON THE VISIBLE REGION SPECTRUM OF YOH
No full textAuthor Institution: Chemistry Department, University of British Columbia; Department of Physics and Astronomy, University of British Columbia; Lambda Physik, Inc., 3201 West Commercial Blvd.Further analysis of the visible region electronic band systems of YOH and YOD has been performed. Three electronic states, and , have been found. Wavelength-resolved fluorescence spectra have given a large amount of information about the vibrational frequencies of the state. Exciting from the level of the ground state, we have been able to determine the separation of the or 0 levels. The geometric structure of the ground state is found to be {\AA} and {\AA}. Due to the perturbed nature of the , and states, an accurate determination of their geometries has not been possible. We have tentatively identified several members of the progressions in these states
STRONG VIBRONIC COUPLING IN THE VISIBLE SYSTEMS OF YOH AND YOD
No full textAuthor Institution: Department of Chemistry, University of New Brunswick; Department of Chemistry, University of British Columbia; Lambda-Physik, Inc., 3201 West Commercial Blvd.Extensive new spectra have been taken for the visible systems of YOH and YOD, in an attempt to establish the vibrational assignments in the very confused and states. It turns out that there is very strong vibronic coupling through the bending vibration between the state and the (lower) Born-Oppenheimer component of the state. The effect is that the bending frequency of the state is increased by 50\% relative to the ground state, while that of the component of the state is reduced so far that the molecule becomes non-linear, with a potential barrier of about at the linear configuration; the (upper) component of the state is not affected. The principal evidence for the barrier is that the 010 vibronic level lies below the 000 level (linear molecule notation) in the state of YOD. The density of the level structure in the state arises partly because higher levels of the state lying among the levels of the state gain intensity through the vibronic coupling
On the Equivalence of Two Deformation Schemes in Quantum Field Theory
No full textTwo recent deformation schemes for quantum field theories on two-dimensional Minkowski space, making use of deformed field operators and Longo–Witten endomorphisms, respectively, are shown to be equivalent
ELECTRONIC RAMAN EFFECT OF TRIVALENT RARE EARTH IONS IN GARNET HOST LATTICES
No full textAuthor Institution: Department of Chemistry, Carleton UniversityWe wish to report on the observation and interpretation of some electronic Raman transitions between Stark levels of the split J manifolds of Eu:YGaG and Nd:YGaG. The transitions were studied at and . The detection of the weak spectra was accomplished with a 9558 B photomultiplier, followed by an electronic amplification system proposed by Pao and . The experimental data suggest (I) a lowering in the site symmetry of the rare earth ions to if compared with the site symmetry of the Yttrium ion of YGaG and (II) the intensity of the electronic Raman transitions is down by a factor of if compared with the intensity of some strong fluorescence lines of the ions. Yoh-Han Pao and J. E. Griffith, Abstracts 8th European Congress on Mol. Spectroscopy, Copenhagen, 1965
Pogo accumulator optimization based on multiphysics of liquid rockets and neural networks
No full textIn this study, a numerical analysis of pogo instability in liquid propulsion rockets was conducted and an optimization of the pogo suppressor was attempted. Pogo analysis was carried out using numerical results obtained via the major models for fuselage structure, feedline, and propulsion systems. In the structural system, the fuselage vibration modes were obtained and the relevant meta-model was constructed using the modal superposition method. To obtain accurate results for the hydraulic transmission line modeling, cavitation effects were also taken into account. Thus, a numerical analysis was performed on a pump inducer to provide the quantitative information of the cavitation volume in the liquid-oxygen feedline. By employing the rocket combustion equations, it was confirmed that the dynamic response was fed back to the longitudinal characteristics of the fuselage structure. In addition, an accumulator was installed to suppress pogo instability. For design optimization, an artificial neural network was suggested by performing Latin hypercube sampling. The sampling verifies the convergence by the learning process. Finally, a multi-objective optimization for the pogo accumulator was achieved with the present meta-model.Y
Mammy\u27s Lullaby
No full text[Verse 1]Close yoh dreamy eyes an’ lay yoh head on Mammy’s breat,Stahs ah in de skies an birds ah sleein’ in de nest,Night time is heah, honey don’t feah,Yoh on Mammy’s ahm;Great big yallah moon a shinin’ down upon de stream,Mammy’s little coon will soon be floatin’ in a dream,Slumabh ashile, mah honey chile,Yoh mammy will keep yoh from hahm,
[Chorus]Go to sleep,Wiv yoh head in yoh mammy’s breastCause Mammy knows her dusky rose tiahed an’ longin’ fo’ rest;Go to sleep while de shadders creep,Des dream away till break ob day,An doan yoh eben peep
[Verse 2]In dah sugah cane de owl’s a hootin’ to de moon,Down along de lane I heah de darkies softly cronn,Now hushabye, honey, don’t cry,But des close yoh eyes;When de mawnin’ come an’ all de birds begin to cheepMammy’s sugah plum a goin’ to waken from his sleepDes like a flow’h kissed by de show’h when rain drops come down from de skyYoh Mammy’s pickaniny,De finest an’ de best,De pride of old VirginnySo slumbah, my honey, an’ restGo to sleep,Go to sleep
Hypercortisolemia inhibits yohimbine-induced release of norepinephrine in the posterolateral hypothalamus of conscious rats
No full textChronic hypercortisolemia attenuates yohimbine (YOH)-induced increments in plasma levels of the sympathetic neurotransmitter norepinephrine (NE). The present study used in vivo microdialysis to study the effects of hypercortisolemia on YOH-induced release of NE in the brain. Cortisol (25 mg/kg-day) or saline was infused sc into rats for 7 days via an osmotic minipump. Microdialysate and plasma concentrations of NE and its metabolites dihydroxyphenylglycol and meth- oxyhydroxyphenylglycol were measured before and after YOH (1 mg/kg, iv) administration in conscious animals, with microdialysate and plasma collections beginning 20-24 h after probe implantation. Chronic cortisol treatment resulted in attenuated NE, ihydroxyphenylglycol, and methoxyhydroxyphenylglycol responses in both microdialysate and plasma. The results indicate that YOH increases central neural as well as peripheral release, reuptake, turnover, and metabolism of NE and that hypercortisolemia suppresses these responses. © 1992 by The Endocrine Society
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