464 research outputs found
UNUSUAL NEGATIVE MOLECULAR IONS AND DIANIONS AND CHEMICAL BONDS INVOLVING RYDBERG ORBITALS
No full text1. Maciej Gutowski, Piotr Skurski, Kenneth D. Jordan, Jack Simons; Int J. Quant. Chem.; 64, 183 (1997). 2. P. Skurski, M. Gutowski and J. Simons, Int J. Quant Chem. 76. 197 (2000). 3. Alexander I. Boldyrev, Maciej Gutowski, and Jack Simons; Acc. Chem. Res.; 29, 497 (1996). 4. Jack Simons and Maciej Gutowski, Chem. Rev. 91, 669 (1991). 5. A. I. Boldyrev and J. Simons; J. Phys. Chem. 96, 8840 (1992); A. I. Boldyrev and J. Simons. J. Phys. Chem., 103, 3575 (1999).Author Institution: Department of Chemistry and Henry Eyring Center for Theoretical Chemistry, University of UtahIn this presentation, our work and that of several other groups on the species listed in the title will be discussed. Particular emphasis will be given to: (a) dipole bound (which have also been the subject of numerous experimental studies), (b) dipole bound (which remain theoretical speculation), (c) resonance states of anions that can be made stable via ``solvation'', (d) dianions such as that have extremely high second electron binding (which occur in the solid state and in solution), (e) anions in which the ``extra'' electron occupies a Rydberg-like molecular (which have been seen experimentally), and (f) chemical bonds that arise when a Rydberg-like orbital is
Mechanisms of top-down facilitation in perception of visual objects studied by fMRI
No full textPrior knowledge regarding the possible identity of an object facilitates its recognition from a degraded visual input, though the underlying mechanisms are unclear. Previous work implicated ventral visual cortex but did not disambiguate whether activity-changes in these regions are causal to or merely reflect an effect of facilitated recognition. We used functional magnetic resonance imaging to study top-down influences on processing of gradually revealed objects, by preceding each object with a name that was congruent or incongruent with the object. Congruently primed objects were recognized earlier than incongruently primed, and this was paralleled by shifts in activation profiles for ventral visual, parietal, and prefrontal cortices. Prior to recognition, defined on a trial-by-trial basis, activity in ventral visual cortex rose gradually but equivalently for congruently and incongruently primed objects. In contrast, prerecognition activity was greater with congruent priming in lateral parietal, retrosplenial, and lateral prefrontal cortices, whereas functional coupling between parietal and ventral visual (and also left lateral prefrontal and parietal) cortices was enhanced in the same context. Thus, when controlling for recognition point and stimulus information, activity in ventral visual cortex mirrors recognition success, independent of condition. Facilitation by top-down cues involves lateral parietal cortex interacting with ventral visual areas, potentially explaining why parietal lesions can lead to deficits in recognizing degraded objects even in the context of top-down knowledge
Two-loop Sudakov form factor in ABJM
No full textThis article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Neural basis for priming of pop-out during visual search revealed with fMRI
No full textMalikovic and Nakayama first showed that visual search efficiency can be influenced by priming effects. Even "pop-out" targets (defined by unique color) are judged quicker if they appear at the same location and/or in the same color as on the preceding trial, in an unpredictable sequence. Here, we studied the potential neural correlates of such priming in human visual search using functional magnetic resonance imaging (fMRI). We found that repeating either the location or the color of a singleton target led to repetition suppression of blood oxygen level-dependent (BOLD) activity in brain regions traditionally linked with attentional control, including bilateral intraparietal sulci. This indicates that the attention system of the human brain can be "primed," in apparent analogy to repetition-suppression effects on activity in other neural systems. For repetition of target color but not location, we also found repetition suppression in inferior temporal areas that may be associated with color processing, whereas repetition of target location led to greater reduction of activation in contralateral inferior parietal and frontal areas, relative to color repetition. The frontal eye fields were also implicated, notably when both target properties (color and location) were repeated together, which also led to further BOLD decreases in anterior fusiform cortex not seen when either property was repeated alone. These findings reveal the neural correlates for priming of pop-out search, including commonalities, differences, and interactions between location and color repetition. fMRI repetition-suppression effects may arise in components of the attention network because these settle into a stable 1. attractor state" more readily when the same target property is repeated than when a different attentional state is required
Iron depletion in the deep chlorophyll maximum: mesoscale eddies as natural iron fertilization experiments
No full text© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hawco, N. J., Barone, B., Church, M. J., Babcock-Adams, L., Repeta, D. J., Wear, E. K., Foreman, R. K., Bjorkman, K. M., Bent, S., Van Mooy, B. A. S., Sheyn, U., DeLong, E. F., Acker, M., Kelly, R. L., Nelson, A., Ranieri, J., Clemente, T. M., Karl, D. M., & John, S. G. Iron depletion in the deep chlorophyll maximum: mesoscale eddies as natural iron fertilization experiments. Global Biogeochemical Cycles, 35(12), (2021): e2021GB007112, https://doi.org/10.1029/2021GB007112.In stratified oligotrophic waters, phytoplankton communities forming the deep chlorophyll maximum (DCM) are isolated from atmospheric iron sources above and remineralized iron sources below. Reduced supply leads to a minimum in dissolved iron (dFe) near 100 m, but it is unclear if iron limits growth at the DCM. Here, we propose that natural iron addition events occur regularly with the passage of mesoscale eddies, which alter the supply of dFe and other nutrients relative to the availability of light, and can be used to test for iron limitation at the DCM. This framework is applied to two eddies sampled in the North Pacific Subtropical Gyre. Observations in an anticyclonic eddy center indicated downwelling of iron-rich surface waters, leading to increased dFe at the DCM but no increase in productivity. In contrast, uplift of isopycnals within a cyclonic eddy center increased supply of both nitrate and dFe to the DCM, and led to dominance of picoeukaryotic phytoplankton. Iron addition experiments did not increase productivity in either eddy, but significant enhancement of leucine incorporation in the light was observed in the cyclonic eddy, a potential indicator of iron stress among Prochlorococcus. Rapid cycling of siderophores and low dFe:nitrate uptake ratios also indicate that a portion of the microbial community was stressed by low iron. However, near-complete nitrate drawdown in this eddy, which represents an extreme case in nutrient supply compared to nearby Hawaii Ocean Time-series observations, suggests that recycling of dFe in oligotrophic ecosystems is sufficient to avoid iron limitation in the DCM under typical conditions.The expedition and analyses were supported by the Simons Foundation SCOPE Grant 329108 to S. G. John, M. J. Church, D. J. Repeta, B. Van Mooy, E. F. DeLong, and D. M. Karl. N. J. Hawco was supported by a Simons Foundation Marine Microbial Ecology and Evolution postdoctoral fellowship (602538) and Simons Foundation grant 823167
Book Reviews
No full textBook Review 1Book Title: Tropical Nutritional Disorders of Infants and ChildrenBook Authors: C.C. de Silva & N.G. BaptistPp. xiii + 226. $11.50. Springfield, Ill.: Charles C. Thomas. 1969.Book Review 2Book Title: Gynaecological and Obstetrical AnatomyBook Authors: C.F.V. Smout, F Jacoby & E.W. Lillie (Eds.)Pp. viii + 422. Illustrated. £4.10.0. London: H. K. Lewis. 1969Book Review 3Book Title: Some Inherited Disorders of Brain and MuscleBook Authors: J.D. Allan & D.N. Raine (Eds.)Pp. viii + 154. Illustrated. £2.1.5. Edinburgh and London: E. & S. Livingstone. 1969Book Review 4Book Title: The Anatomy of the Developing LungBook Author: J Emery & F.C. Path (Eds.)Pp. 223, Londen: William Heinemann Medical Books. 1969Book Review 5Book Title: Essays on Tropical DermatologyBook Author: R.D.G.P. Simons & J Marshall (Eds.)Pp. Vlll + 283. Illustrated. £8.7.0./ Dfl. 72,00. Amsterdam: Excerpta Medica Foundation. 1969Book Review 6Book Title: Survival in Cold Water. The physiology and treatment of immersion hypothermia and of drowningBook Author: W.R. KeatingePp. x + 131. £1.10.0. Oxford: Blackwell Scientific Publications. 1969
Advisory committee process and program design : low carbon fuel standards
No full textFinal Report -- Appendix A. Summary of Advisory Committee Input -- Appendix B. Lifecycle Analysis -- Appendix C. Infrastructure Cost Assumptions Memorandum -- Appendix D. Economic Analysis -- Appendix E. Comparable Economic Studies in Other States -- Appendix F. Compliance Scenario Documentation -- Appendix G. Indirect Land Use Change Comparative Analysis -- Appendix H. Fuels Assessment Discussion Paper -- Appendix I. Oregon Biomass Assessment -- Appendix J. Credit and Deficit Calculations -- Appendix K. Review of Biodiesel and Renewable Diesel Use Considerations.principal authors: Sue Langston, David Collier, Cory Ann Wind, Dave Nordberg, Carrie Ann Capp, Wendy Simons.Title from PDF cover (viewed on April 20, 2020)."11-AQ-004."This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
On the effects of the Chern-Simons term in an Abelian gauged Skyrme model in d=4+1 dimensions.
No full text©2021 The Author(s). Published by Elsevier B.V.
We would like to thank Valery Rubakov for important and very useful discussions. The work of E.R. is supported by the Center for Research and Development in Mathematics and Applications (CIDMA) through the Portuguese Foundation for Science and Technology (FCT -Fundacao para a Ciencia e a Tecnologia), references UIDB/04106/2020 and UIDP/04106/2020 and by national funds (OE), through FCT, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23,of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. We acknowledge support from the projects PTDC/FIS-OUT/28407/2017 and CERN/FIS-PAR/0027/2019. This work has further been supported by the European Union's Horizon 2020 research and innovation (RISE) programme H2020-MSCA-RISE-2017 Grant No. FunFiCO-777740. The authors would like to acknowledge networking support by the COST Action CA16104.We study an Abelian gauged O (5) Skyrme model in 4 + 1 dimensions, featuring the F-4 Maxwell and the Chern-Simons terms. Our aim is to expose the mechanism, discovered in the analogous Abelian gauged O (3) Skyrme model in 2 + 1 dimensions, which leads to the unusual relation of the mass-energy E to the electric charge Q(e) and angular momentum J, and, to the change in the value of the "baryon number" q due to the influence of the Abelian field on the Skyrmion. Chern-Simons dynamics together with the dynamics of the gauged Skyrme scalar, allows for solutions with varying asymptotic values of the magnetic field, resulting in these unusual properties listed. Numerical work is carried out on an effective one dimensional subsystem resulting from imposition of an enhanced radial symmetry on R-4. (C) 2021 The Author(s). Published by Elsevier B.V.Unión Europea. Horizonte 2020Center for Research and Development in Mathematics and Applications (CIDMA) through the Portuguese Foundation for Science and Technology (FCT - Fundacao para a Ciência e a Tecnologia)Fundação para a Ciência e a Tecnologia (FCT)Depto. de Física TeóricaFac. de Ciencias FísicasTRUEpu
The Early Data Release of the Dark Energy Spectroscopic Instrument
No full textAdame, A. G. et al.-- Full list of authors: DESI Collaboration; Adame, A. G.; Aguilar, J.; Ahlen, S.; Alam, S.; Aldering, G.; Alexander, D. M.; Alfarsy, R.; Allende Prieto, C.; Alvarez, M.; Alves, O.; Anand, A.; Andrade-Oliveira, F.; Armengaud, E.; Asorey, J.; Avila, S.; Aviles, A.; Bailey, S.; Balaguera-Antolínez, A.; Ballester, O.; Baltay, C.; Bault, A.; Bautista, J.; Behera, J.; Beltran, S. F.; BenZvi, S.; Beraldo e Silva, L.; Bermejo-Climent, J. R.; Berti, A.; Besuner, R.; Beutler, F.; Bianchi, D.; Blake, C.; Blum, R.; Bolton, A. S.; Brieden, S.; Brodzeller, A.; Brooks, D.; Brown, Z.; Buckley-Geer, E.; Burtin, E.; Cabayol-Garcia, L.; Cai, Z.; Canning, R.; Cardiel-Sas, L.; Carnero Rosell, A.; Castander, F. J.; Cervantes-Cota, J. L.; Chabanier, S.; Chaussidon, E.; Chaves-Montero, J.; Chen, S.; Chen, X.; Chuang, C.; Claybaugh, T.; Cole, S.; Cooper, A. P.; Cuceu, A.; Davis, T. M.; Dawson, K.; de Belsunce, R.; de la Cruz, R.; de la Macorra, A.; Della Costa, J.; de Mattia, A.; Demina, R.; Demirbozan, U.; DeRose, J.; Dey, A.; Dey, B.; Dhungana, G.; Ding, J.; Ding, Z.; Doel, P.; Doshi, R.; Douglass, K.; Edge, A.; Eftekharzadeh, S.; Eisenstein, D. J.; Elliott, A.; Ereza, J.; Escoffier, S.; Fagrelius, P.; Fan, X.; Fanning, K.; Fawcett, V. A.; Ferraro, S.; Flaugher, B.; Font-Ribera, A.; Forero-Romero, J. E.; Forero-Sánchez, D.; Frenk, C. S.; Gänsicke, B. T.; García, L. Á.; García-Bellido, J.; Garcia-Quintero, C.; Garrison, L. H.; Gil-Marín, H.; Golden-Marx, J.; Gontcho A Gontcho, S.; Gonzalez-Morales, A. X.; Gonzalez-Perez, V.; Gordon, C.; Graur, O.; Green, D.; Gruen, D.; Guy, J.; Hadzhiyska, B.; Hahn, C.; Han, J. J.; Hanif, M. M. S.; Herrera-Alcantar, H. K.; Honscheid, K.; Hou, J.; Howlett, C.; Huterer, D.; Iršič, V.; Ishak, M.; Jacques, A.; Jana, A.; Jiang, L.; Jimenez, J.; Jing, Y. P.; Joudaki, S.; Joyce, R.; Jullo, E.; Juneau, S.; Karaçaylı, N. G.; Karim, T.; Kehoe, R.; Kent, S.; Khederlarian, A.; Kim, S.; Kirkby, D.; Kisner, T.; Kitaura, F.; Kizhuprakkat, N.; Kneib, J.; Koposov, S. E.; Kovács, A.; Kremin, A.; Krolewski, A.; L'Huillier, B.; Lahav, O.; Lambert, A.; Lamman, C.; Lan, T. -W.; Landriau, M.; Lang, D.; Lange, J. U.; Lasker, J.; Leauthaud, A.; Le Guillou, L.; Levi, M. E.; Li, T. S.; Linder, E.; Lyons, A.; Magneville, C.; Manera, M.; Manser, C. J.; Margala, D.; Martini, P.; McDonald, P.; Medina, G. E.; Medina-Varela, L.; Meisner, A.; Mena-Fernández, J.; Meneses-Rizo, J.; Mezcua, M.; Miquel, R.; Montero-Camacho, P.; Moon, J.; Moore, S.; Moustakas, J.; Mueller, E.; Mundet, J.; Muñoz-Gutiérrez, A.; Myers, A. D.; Nadathur, S.; Napolitano, L.; Neveux, R.; Newman, J. A.; Nie, J.; Nikutta, R.; Niz, G.; Norberg, P.; Noriega, H. E.; Paillas, E.; Palanque-Delabrouille, N.; Palmese, A.; Pan, Z.; Parkinson, D.; Penmetsa, S.; Percival, W. J.; Pérez-Fernández, A.; Pérez-Ràfols, I.; Pieri, M.; Poppett, C.; Porredon, A.; Pothier, S.; Prada, F.; Pucha, R.; Raichoor, A.; Ramírez-Pérez, C.; Ramirez-Solano, S.; Rashkovetskyi, M.; Ravoux, C.; Rocher, A.; Rockosi, C.; Ross, A. J.; Rossi, G.; Ruggeri, R.; Ruhlmann-Kleider, V.; Sabiu, C. G.; Said, K.; Saintonge, A.; Samushia, L.; Sanchez, E.; Saulder, C.; Schaan, E.; Schlafly, E. F.; Schlegel, D.; Scholte, D.; Schubnell, M.; Seo, H.; Shafieloo, A.; Sharples, R.; Sheu, W.; Silber, J.; Sinigaglia, F.; Siudek, M.; Slepian, Z.; Smith, A.; Soumagnac, M. T.; Sprayberry, D.; Stephey, L.; Suárez-Pérez, J.; Sun, Z.; Tan, T.; Tarlé, G.; Tojeiro, R.; Ureña-López, L. A.; Vaisakh, R.; Valcin, D.; Valdes, F.; Valluri, M.; Vargas-Magaña, M.; Variu, A.; Verde, L.; Walther, M.; Wang, B.; Wang, M. S.; Weaver, B. A.; Weaverdyck, N.; Wechsler, R. H.; White, M.; Xie, Y.; Yang, J.; Yèche, C.; Yu, J.; Yuan, S.; Zhang, H.; Zhang, Z.; Zhao, C.; Zheng, Z.; Zhou, R.; Zhou, Z.; Zou, H.; Zou, S.; Zu, Y.The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This paper describes the public release of those spectra, the catalogs of derived properties, and the intermediate data products. In total, the public release includes good-quality spectral information from 466,447 objects targeted as part of the Milky Way Survey, 428,758 as part of the Bright Galaxy Survey, 227,318 as part of the Luminous Red Galaxy sample, 437,664 as part of the Emission Line Galaxy sample, and 76,079 as part of the Quasar sample. In addition, the release includes spectral information from 137,148 objects that expand the scope beyond the primary samples as part of a series of secondary programs. Here, we describe the spectral data, data quality, data products, Large-Scale Structure science catalogs, access to the data, and references that provide relevant background to using these spectra. © 2024. The Author(s).This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of High-Energy Physics, under contract No. DE-AC02-05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract. Additional support for DESI was provided by the U.S. National Science Foundation (NSF), Division of Astronomical Sciences under contract No. AST-0950945 to the NSF's National Optical-Infrared Astronomy Research Laboratory; the Science and Technology Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Science and Technology of Mexico (CONACYT); the Ministry of Science and Innovation of Spain (MICINN), and by the DESI Member Institutions: https://www.desi.lbl.gov/collaborating-institutions. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U.S. National Science Foundation, the U.S. Department of Energy, or any of the listed funding agencies.
The authors are honored to be permitted to conduct scientific research on Iolkam Du'ag (Kitt Peak), a mountain with particular significance to the Tohono O'odham Nation.
Facility: Mayall (DESI) - .
Software: astropy (Astropy Collaboration et al. 2013, 2018, 2022), healpy (Zonca et al. 2019), desispec (Guy et al. 2023), desitarget (Myers et al. 2023), Redrock (S. J. Bailey et al. 2023, in preparation)Peer reviewe
ABJ(M) Chiral Primary Three-Point Function at Two-loops
No full textThis article is distributed under the terms of the Creative Commons
Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.archiveprefix: arXiv primaryclass: hep-th reportnumber: QMUL-PH-14-10 slaccitation: %%CITATION = ARXIV:1404.1117;%%archiveprefix: arXiv primaryclass: hep-th reportnumber: QMUL-PH-14-10 slaccitation: %%CITATION = ARXIV:1404.1117;%%archiveprefix: arXiv primaryclass: hep-th reportnumber: QMUL-PH-14-10 slaccitation: %%CITATION = ARXIV:1404.1117;%%Article funded by SCOAP
- …
