94 research outputs found
Infrared-ultraviolet spectra of active galactic nuclei
Data from IRAS and IUE were combined with ground based optical and infrared spectrophotometry to derive emission line free spectral energy distributions (SEDs) for 29 active galactic nuclei (AGNs) between 0.1 and 100 microns. The IRAS data were scaled down to account for extended emission. These correction factors, determined by comparing small aperture ground based 10.6 micron data with large aperture IRAS 12 micron fluxes, were usually less than 25%. These corrected SEDs are shown
STEL Benchmark Verb Alignment to Cognitive, Affective, and Psychomotor Domains
(First paragraph) Curriculum developers and classroom teachers often need to make sure they are teaching and assessing students at the appropriate levels of the cognitive, affective, and psychomotor domains. The STEL benchmarks are written with active verbs to target different levels of these domains. In addition, curriculum developers and classroom teachers want to know whether the benchmarks are at the factual, conceptual, procedural, or metacognitive level of knowledge. The second resource being provided on ITEEA’s interactive STEL website will identify these factors for all 142 STEL benchmarks. This tool was developed to help insure the alignment of the three domains to the technology and engineering dimensions and to student outcomes
Linear Collider Capabilities for Supersymmetry in Dark Matter Allowed Regions of the mSUGRA Model
Recent comparisons of minimal supergravity (mSUGRA) model predictions with
WMAP measurements of the neutralino relic density point to preferred regions of
model parameter space. We investigate the reach of linear colliders (LC) with
and 1 TeV for SUSY in the framework of the mSUGRA model. We find
that LCs can cover the entire stau co-annihilation region provided \tan\beta
\alt 30. In the hyperbolic branch/focus point (HB/FP) region of parameter
space, specialized cuts are suggested to increase the reach in this important
``dark matter allowed'' area. In the case of the HB/FP region, the reach of a
LC extends well past the reach of the CERN LHC. We examine a case study in the
HB/FP region, and show that the MSSM parameters and can be
sufficiently well-measured to demonstrate that one would indeed be in the HB/FP
region, where the lightest chargino and neutralino have a substantial higgsino
component.Comment: 29 pages, 15 EPS figures; updated version slightly modified to
conform with published versio
The Gravitational Universe
The last century has seen enormous progress in our understanding of the Universe. We know the life cycles of stars, the structure of galaxies, the remnants of the big bang, and have a general understanding of how the Universe evolved. We have come remarkably far using electromagnetic radiation as our tool for observing the Universe. However, gravity is the engine behind many of the processes in the Universe, and much of its action is dark. Opening a gravitational window on the Universe will let us go further than any alternative. Gravity has its own messenger: Gravitational waves, ripples in the fabric of spacetime. They travel essentially undisturbed and let us peer deep into the formation of the first seed black holes, exploring redshifts as large as z ~ 20, prior to the epoch of cosmic re-ionisation. Exquisite and unprecedented measurements of black hole masses and spins will make it possible to trace the history of black holes across all stages of galaxy evolution, and at the same time constrain any deviation from the Kerr metric of General Relativity. eLISA will be the first ever mission to study the entire Universe with gravitational waves. eLISA is an all-sky monitor and will offer a wide view of a dynamic cosmos using gravitational waves as new and unique messengers to unveil The Gravitational Universe. It provides the closest ever view of the early processes at TeV energies, has guaranteed sources in the form of verification binaries in the Milky Way, and can probe the entire Universe, from its smallest scales around singularities and black holes, all the way to cosmological dimensions
111 oriented gold nanoplatelets on multilayer graphene as visible light photocatalyst for overall water splitting
[EN] Development of renewable fuels from solar light appears as one of the main current challenges in energy science. A plethora of photocatalysts have been investigated to obtain hydrogen and oxygen from water and solar light in the last decades. However, the photon-to-hydrogen molecule conversion is still far from allowing real implementation of solar fuels. Here we show that 111 facet-oriented gold nanoplatelets on multilayer graphene films deposited on quartz is a highly active photocatalyst for simulated sunlight overall water splitting into hydrogen and oxygen in the absence of sacrificial electron donors, achieving hydrogen production rate of 1.2 molH2 per gcomposite per h. This photocatalytic activity arises from the gold preferential orientation and the strong gold–graphene interaction occurring in the composite system.Financial support by the Spanish Ministry of Economy and Competitiveness (Severo Ochoa and CTQ2012-32315) and Generalitat Valenciana (Prometeo 2013-019) is gratefully acknowledged. D.M. and I.E.-A. thank to Spanish Ministry of Science for PhD scholarships.Mateo Mateo, D.; Esteve Adell, I.; Albero Sancho, J.; Sánchez Royo, JF.; Primo Arnau, AM.; GarcÃa Gómez, H. (2016). 111 oriented gold nanoplatelets on multilayer graphene as visible light photocatalyst for overall water splitting. Nature Communications. 2016(7):1-8. https://doi.org/10.1038/ncomms11819S1820167Lv, X. J., Zhou, S., Huang, X., Wang, C. & Fu, W. F. Photocatalytic overall water splitting promoted by SnOx-NiGa2O4 photocatalysts. Appl. Cat. B: Environ. 182, 220–228 (2016).Xu, J., Wang, L. & Cao, X. Polymer supported graphene-CdS composite catalyst with enhanced photocatalytic hydrogen production from water splitting under visible light. Chem. Eng. J. 283, 816–825 (2016).Tanigawa, S. & Irie, H. Visible-light-sensitive two-step overall water-splitting based on band structure control of titanium dioxide. Appl. Cat. B: Environ. 180, 1–5 (2016).Maeda, K. et al. GaN:ZnO solid solution as a photocatalyst for visible-light-driven overall water splitting. J. Am. Chem. Soc. 127, 8286–8287 (2005).Maeda, K. et al. Photocatalyst releasing hydrogen from water. Nature 440, 295 (2006).Kato, H. & Kudo, A. Visible-light-response and photocatalytic activities of TiO2 and SrTiO3 photocatalysts codoped with antimony and chromium. J. Phys. Chem. B 106, 5029–5034 (2002).Xiang, Q., Cheng, B. & Yu, J. Graphene-based photocatalysts for solar-fuel generation. Angew. Chem. Int. Ed. 54, 11350–11366 (2015).Navalon, S., Dhakshinamoorthy, A., Alvaro, M. & Garcia, H. Carbocatalysis by graphene-based materials. Chem. Rev. 114, 6179–6212 (2014).Yu, J., Jin, J., Cheng, B. & Jaroniec, M. A noble metal-free reduced graphene oxide-cds nanorod composite for the enhanced visible-light photocatalytic reduction of CO2 to solar fuel. J. Mat. Chem. A 2, 3407–3416 (2014).Meng, F., Cushing, S. K., Li, J., Hao, S. & Wu, N. Enhancement of solar hydrogen generation by synergistic interaction of La2Ti2O7 photocatalyst with plasmonic gold nanoparticles and reduced graphene oxide nanosheets. ACS Catal. 5, 1949–1955 (2015).Shown, I. et al. Highly efficient visible light photocatalytic reduction of co2 to hydrocarbon fuels by cu-nanoparticle decorated graphene oxide. Nano Lett. 14, 6097–6103 (2014).Shang, L. et al. Graphene-supported ultrafine metal nanoparticles encapsulated by mesoporous silica: robust catalysts for oxidation and reduction reactions. Angew. Chem. Int. Ed. 53, 250–254 (2014).Latorre-Sánchez, M., Primo, A. & GarcÃa, H. P-doped graphene obtained by pyrolysis of modified alginate as a photocatalyst for hydrogen generation from water-methanol mixtures. Angew. Chem. Int. Ed. 52, 11813–11816 (2013).Lavorato, C., Primo, A., Molinari, R. & Garcia, H. N-doped graphene derived from biomass as a visible-light photocatalyst for hydrogen generation from water/methanol mixtures. Chem. - A Eur. J. 20, 187–194 (2014).Shams, S. S., Zhang, L. S., Hu, R., Zhang, R. & Zhu, J. Synthesis of graphene from biomass: a green chemistry approach. Mater. Lett. 161, 476–479 (2015).Meng, F. et al. Biomass-derived high-performance tungsten-based electrocatalysts on graphene for hydrogen evolution. J. Mater. Chem. A 3, 18572–18577 (2015).Vilatela, J. J. & Eder, D. Nanocarbon composites and hybrids in sustainability: a review. ChemSusChem 5, 456–478 (2012).Rani, P. & Jindal, V. K. Designing band gap of graphene by B and N dopant atoms. RSC Adv. 3, 802–812 (2013).Zheng, Y. et al. Hydrogen evolution by a metal-free electrocatalyst. Nat. Commun. 5, 3783 (2014).Wang, X. et al. A metal-free polymeric photocatalyst for hydrogen production from water under visible light. Nat. Mater. 8, 76–80 (2009).Huang, H., Yang, S., Vajtai, R., Wang, X. & Ajayan, P. M. Pt-decorated 3D architectures built from graphene and graphitic carbon nitride nanosheets as efficient methanol oxidation catalysts. Adv. Mater. 26, 5160–5165 (2014).Shiraishi, Y. et al. Platinum nanoparticles strongly associated with graphitic carbon nitride as efficient co-catalysts for photocatalytic hydrogen evolution under visible light. Chem. Commun. 50, 15255–15258 (2014).G. BaldovÃ, H. et al. Visible-light photoresponse of gold nanoparticles supported on TiO2: A combined photocatalytic, photoelectrochemical, and transient spectroscopy study. ChemPhysChem 16, 335–341 (2015).Serra, M., Albero, J. & Garcia, H. Photocatalytic Activity of Au/TiO2 photocatalysts for H-2 evolution: role of the Au nanoparticles as a function of the irradiation wavelength. ChemPhysChem 16, 1842–1845 (2015).Gomes Silva, C., Juárez, R., Marino, T., Molinari, R. & GarcÃa, H. Influence of excitation wavelength (UV or visible light) on the photocatalytic activity of titania containing gold nanoparticles for the generation of hydrogen or oxygen from water. J. Am. Chem. Soc. 133, 595–602 (2011).El Kadib, A. Chitosan as a sustainable organocatalyst: a concise overview. ChemSusChem 8, 217–244 (2015).Primo, A., Atienzar, P., Sanchez, E., Delgado, J. M. & GarcÃa, H. From biomass wastes to large-area, high-quality, N-doped graphene: catalyst-free carbonization of chitosan coatings on arbitrary substrates. Chem. Commun. 48, 9254–9256 (2012).Primo, A. & Quignard, F. Chitosan as efficient porous support for dispersion of highly active gold nanoparticles: design of hybrid catalyst for carbon-carbon bond formation. Chem. Commun. 46, 5593–5595 (2010).Primo, A. et al. One-step pyrolysis preparation of 1.1.1 oriented gold nanoplatelets supported on graphene and six orders of magnitude enhancement of the resulting catalytic activity. Angew. Chem. Int. Ed. 54, 1–7 (2015).Lalov, I. G., Guerginov, I. I., Krysteva, M. A. & Fartsov, K. Treatment of waste water from distilleries with chitosan. Water Res. 34, 1503–1506 (2000).No, H. K. & Meyers, S. P. Application of Chitosan for Treatment of Wastewaters in Reviews of Environmental Contamination and Toxicology: Continuation of Residue Reviews eds George W. W. 1–27Springer (2000).Liu, C. et al. Hydrothermal synthesis of N-doped TiO2 nanowires and N-doped graphene heterostructures with enhanced photocatalytic properties. J. Alloys Compd. 656, 24–32 (2016).Radnik, J., Mohr, C. & Claus, P. On the origin of binding energy shifts of core levels of supported gold nanoparticles and dependence of pretreatment and materials synthesis. Phys. Chem. Chem. Phys. 5, 172–177 (2003).Primo, A. et al. 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ECCE sensitivity studies for single hadron transverse single spin asymmetry measurements
The file archived on this repository is a pre-print and does not include peer review corrections. Please see the corrected version of record of this paper at: https://doi.org/10.1016/j.nima.2023.168017.Comments: 22 pages, 22 figures, to be submitted to joint ECCE proposal NIM-A volume
Subjects: High Energy Physics - Experiment (hep-ex)
Report number: ecce-paper-phys-2022-08
Cite as: arXiv:2207.10890 [hep-ex]
(or arXiv:2207.10890v1 [hep-ex] for this version)
https://doi.org/10.48550/arXiv.2207.10890
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Related DOI:
https://doi.org/10.1016/j.nima.2023.168017
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Submission history
From: Ralf Seidl [view email]
[v1] Fri, 22 Jul 2022 05:52:35 UTC (23,821 KB)Copyright 2022 The Author(s). We performed feasibility studies for various single transverse spin measurements that are related to the Sivers effect, transversity and the tensor charge, and the Collins fragmentation function. The processes studied include semi-inclusive deep inelastic scattering (SIDIS) where single hadrons (pions and kaons) were detected in addition to the scattered DIS lepton. The data were obtained in pythia6 and geant4 simulated e+p collisions at 18 GeV on 275 GeV, 18 on 100, 10 on 100, and 5 on 41 that use the ECCE detector configuration. Typical DIS kinematics were selected, most notably 2 > 1 GeV2, and cover the range from 10−4 to 1. The single spin asymmetries were extracted as a function of and 2, as well as the semi-inclusive variables , which corresponds to the momentum fraction the detected hadron carries relative to the struck parton, and , which corresponds to the transverse momentum of the detected hadron relative to the virtual photon. They are obtained in azimuthal moments in combinations of the azimuthal angles of the hadron transverse momentum and transverse spin of the nucleon relative to the lepton scattering plane. In order to extract asymmetries, the initially unpolarized MonteCarlo was re-weighted in the true kinematic variables, hadron types and parton flavors based on global fits of fixed target SIDIS experiments and +− annihilation data. The expected statistical precision of such measurements is extrapolated to 10 fb−1 and potential systematic uncertainties are approximated given the deviations between true and reconstructed yields. Similar neutron information is obtained by comparing the ECCE e+p pseudo-data with the same from the EIC Yellow Report and scaling the corresponding Yellow Report e+3He pseudo-data uncertainties accordingly. The impact on the knowledge of the Sivers functions, transversity and tensor charges, and the Collins function has then been evaluated in the same phenomenological extractions as in the Yellow Report. The impact is found to be comparable to that obtained with the parametrized Yellow Report detector and shows that the ECCE detector configuration can fulfill the physics goals on these quantitiesWe acknowledge support from the Office of Nuclear Physics in the Office of Science in the Department of Energy, USA, the National Science Foundation, USA, and the Los Alamos National Laboratory Directed Research and Development (LDRD), USA 20200022DR.
This work was also partially supported by the National Science Foundation, USA under grant No. PHY-2011763, Grant No. PHY-2012002, the U.S. Department of Energy under contract No.DE-AC05-06OR23177 under which Jefferson Science Associates, LLC, manages and operates Jefferson Lab, and within the framework of the TMD Topical Collaboration
Assay of oxysterol-binding protein in a mouse fibroblast, cell-free system. Dissociation constant and other properties of the system.
Procedures for determining a 7.5 S oxysterol-binding protein in the cytosol fraction of cultured mouse fibroblasts were developed. The methods involved precipitation of cytosolic proteins between 0.3 and 0.4 saturation with (NH4)2SO4, incubation of the proteins with 25-hydroxy[3H]cholesterol at 0 degrees C and analysis by velocity sedimentation of 7.5 S radioactivity or of specific binding using dextran-charcoal to adsorb free sterol. By these means it was shown that binding of the ligand to the protein in a citric acid-phosphate buffer was optimal at pH 5.5 and that the sedimentation rate of the complex was greater at pH 7.4 (7.5 S) than at pH 5.5 (6.9 S). The binding protein was essentially saturated at a diol concentration of about 20 X 10(-9) M. The apparent Kd of the sterol-protein complex was approximately 3.9 X 10(-9) M. Cholesterol did not bind to 25-hydroxycholesterol-binding sites on the 7.5 S protein, whereas several oxysterols that are potent suppressors of 3-hydroxy-3-methylglutaryl CoA reductase also inhibited the binding of 25-hydroxycholesterol. One of these sterols, 5 alpha-cholest-8(14)-en-3 beta-ol-15-one was shown to compete for sites occupied by 25-hydroxycholesterol
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Soil-Moisture Stress as Related to Plant-Moisture Stress in Big Sagebrush
Seasonal variation in internal-moisture stress in big sagebrush (Artemisia tridentata Nutt.) is significantly related (correlation coefficient +0.68**) to the lowest soil-moisture stresses in the soil profile. Seasonal values for internal-plant stresses range from 15.3 to 59.8 bars; for lowest soil stress the range was 0.2 to 36.4 bars. Hour of day, wind, and net radiation are also significantly related to internal-moisture stress in plants. The results presented support the hypothesis that inexpensive internal-plant stress measurements may be used to estimate soil-moisture stress and soil-moisture storage.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202
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Sagebrush Conversion to Grassland as Affected by Precipitation, Soil, and Cultural Practices
The most successful conversions of sagebrush to crested wheatgrass, in areas of the Western United States that receive an average of 8 to 14 inches of precipitation annually, usually occur where the annual precipitation exceeds 10 inches and on soils having medium moisture-holding capacities. Conversion results were intermediate on coarse soils having low moisture-holding capacities and comparatively poor on fine soils having high moisture-holding capacities. Degree of grass establishment varied directly with the big sagebrush vigor-index. Grass production was lower on gravelly sites converted from black sagebrush than on nearby sites converted from big sagebrush. Cheatgrass hindered the establishment of crested wheatgrass in some places. Conversion results were poor on sites where greasewood or shadscale was mixed with sagebrush. These halophytes had usually re-established on the treated sites.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202
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