cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk
Creators: name: Bergemann, M.
name: Ruchti, G.
name: Serenelli, A.
name: Feltzing, S.
name: Alves-Brito, A.
name: Asplund, M.
name: Bensby, T.
name: Gruiters, P.
name: Heiter, U.
name: Korn, A.
name: Lind, K.
name: Marino, A.
name: Jofre, P.
name: Nordlander, T.
name: Ryde, N.
name: Gilmore, G.
name: Randich, S.
name: Ferguson, A.
name: Jeffries, R.
name: Micela, G.
name: Negueruela, I.
name: Prusti, T.
name: Rix, H. -W.
name: Vallenari, A.
name: Alfaro, E. J.
name: Prieto, C. Allende
name: Bragaglia, A.
name: Koposov, S. E.
name: Lanzafame, A. C.
name: Pancino, E.
name: Recio-Blanco, A.
name: Smiljanic, R.
name: Walton, N.
name: Costado, M. T.
name: Franciosini, E.
name: Hill, V.
name: Lardo, C.
name: de Laverny, P.
name: Magrini, L.
name: Maiorca, E.
name: Masseron, T.
name: Morbidelli, L.
name: Sacco, G.
name: Kordopatis, G.
name: Tautvaisiene, G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the relationship between age, metallicity, and alpha-enhancement of FGK stars in the Galactic disk. The results are based upon the analysis of high-resolution UVES spectra from the Gaia-ESO large stellar survey. We explore the limitations of the observed dataset, i.e. the accuracy of stellar parameters and the selection effects that are caused by the photometric target preselection. We find that the colour and magnitude cuts in the survey suppress old metal-rich stars and young metal-poor stars. This suppression may be as high as 97% in some regions of the age-metallicity relationship. The dataset consists of 144 stars with a wide range of ages from 0.5 Gyr to 13.5 Gyr, Galactocentric distances from 6 kpc to 9.5 kpc, and vertical distances from the plane 0 < |Z| < 1.5 kpc. On this basis, we find that i) the observed age-metallicity relation is nearly flat in the range of ages between 0 Gyr and 8 Gyr; ii) at ages older than 9 Gyr, we see a decrease in [Fe/H] and a clear absence of metal-rich stars; this cannot be explained by the survey selection functions; iii) there is a significant scatter of [Fe/H] at any age; and iv) [Mg/Fe] increases with age, but the dispersion of [Mg/Fe] at ages > 9 Gyr is not as small as advocated by some other studies. In agreement with earlier work, we find that radial abundance gradients change as a function of vertical distance from the plane. The [Mg/Fe] gradient steepens and becomes negative. In addition, we show that the inner disk is not only more alpha-rich compared to the outer disk, but also older, as traced independently by the ages and Mg abundances of stars.
description: accepted for publication in A&A
Characterizing the tropospheric ozone response to methane emission controls and the benefits to climate and air quality
Creators: name: Fiore, Arlene M.
name: West, J. Jason
name: Horowitz, Larry W.
name: Naik, Vaishali
name: Schwarzkopf, M. Daniel
Publisher: name: Columbia University
Year: 2008
Subjects: subject: Air--Pollution--Measurement
subject: Methane--Environmental aspects
subject: Tropospheric chemistry--Mathematical models
subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Climatic changes
subject: Atmospheric chemistry

description: Reducing methane (CH4) emissions is an attractive option for jointly addressing climate and ozone (O3) air quality goals. With multidecadal full-chemistry transient simulations in the MOZART-2 tropospheric chemistry model, we show that tropospheric O3 responds approximately linearly to changes in CH4 emissions over a range of anthropogenic emissions from 0–430 Tg CH4 a−1 (0.11–0.16 Tg tropospheric O3 or ∼11–15 ppt global mean surface O3 decrease per Tg a−1 CH4 reduced). We find that neither the air quality nor climate benefits depend strongly on the location of the CH4 emission reductions, implying that the lowest cost emission controls can be targeted. With a series of future (2005–2030) transient simulations, we demonstrate that cost-effective CH4 controls would offset the positive climate forcing from CH4 and O3 that would otherwise occur (from increases in NOx and CH4 emissions in the baseline scenario) and improve O3 air quality. We estimate that anthropogenic CH4 contributes 0.7 Wm−2 to climate forcing and ∼4 ppb to surface O3 in 2030 under the baseline scenario. Although the response of surface O3 to CH4 is relatively uniform spatially compared to that from other O3 precursors, it is strongest in regions where surface air mixes frequently with the free troposphere and where the local O3 formation regime is NOx-saturated. In the model, CH4 oxidation within the boundary layer (below ∼2.5 km) contributes more to surface O3 than CH4 oxidation in the free troposphere. In NOx-saturated regions, the surface O3 sensitivity to CH4 can be twice that of the global mean, with >70% of this sensitivity resulting from boundary layer oxidation of CH4. Accurately representing the NOx distribution is thus crucial for quantifying the O3 sensitivity to CH4.
Artificial graphene with tunable interactions
Creators: name: Uehlinger, Thomas
name: Jotzu, Gregor
name: Messer, Michael
name: Greif, Daniel
name: Hofstetter, Walter
name: Bissbort, Ulf
name: Esslinger, Tilman
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We create an artificial graphene system with tunable interactions and study the crossover from metallic to Mott insulating regimes, both in isolated and coupled two-dimensional honeycomb layers. The artificial graphene consists of a two-component spin mixture of an ultracold atomic Fermi gas loaded into a hexagonal optical lattice. For strong repulsive interactions we observe a suppression of double occupancy and measure a gapped excitation spectrum. We present a quantitative comparison between our measurements and theory, making use of a novel numerical method to obtain Wannier functions for complex lattice structures. Extending our studies to time-resolved measurements, we investigate the equilibration of the double occupancy as a function of lattice loading time.
description: 11 pages, 10 figures
Transport of Asian ozone pollution into surface air over the western United States in spring
Creators: name: Lin, Meiyun
name: Fiore, Arlene M.
name: Horowitz, Larry W.
name: Cooper, Owen R.
name: Naik, Vaishali
name: Holloway, John
name: Johnson, Bryan J.
name: Middlebrook, Ann M.
name: Oltmans, Samuel J.
name: Pollack, Ilana B.
name: Ryerson, Tomas B.
name: Warner, Juying X.
name: Wiedinmyer, Christine
name: Wilson, John
name: Wyman, Bruce
Publisher: name: Columbia University
Year: 2012
Subjects: subject: Transboundary pollution
subject: Ozone
subject: Air--Pollution--Measurement
subject: Tropospheric chemistry--Mathematical models
subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Climatic changes
subject: Atmospheric chemistry

description: Many prior studies clearly document episodic Asian pollution in the western U.S. free troposphere. Here, we examine the mechanisms involved in the transport of Asian pollution plumes into western U.S. surface air through an integrated analysis of in situ and satellite measurements in May–June 2010 with a new global high-resolution (∼50 × 50 km2) chemistry-climate model (GFDL AM3). We find that AM3 with full stratosphere-troposphere chemistry nudged to reanalysis winds successfully reproduces observed sharp ozone gradients above California, including the interleaving and mixing of Asian pollution and stratospheric air associated with complex interactions of midlatitude cyclone air streams. Asian pollution descends isentropically behind cold fronts; at ∼800 hPa a maximum enhancement to ozone occurs over the southwestern U.S., including the densely populated Los Angeles Basin. During strong episodes, Asian emissions can contribute 8–15 ppbv ozone in the model on days when observed daily maximum 8-h average ozone (MDA8 O3) exceeds 60 ppbv. We find that in the absence of Asian anthropogenic emissions, 20% of MDA8 O3 exceedances of 60 ppbv in the model would not have occurred in the southwestern USA. For a 75 ppbv threshold, that statistic increases to 53%. Our analysis indicates the potential for Asian emissions to contribute to high-O3 episodes over the high-elevation western USA, with implications for attaining more stringent ozone standards in this region. We further demonstrate a proof-of-concept approach using satellite CO column measurements as a qualitative early warning indicator to forecast Asian ozone pollution events in the western U.S. with lead times of 1–3 days.
title: Using Response Cards in Inclusive Classrooms
Creators: name: Ayers, Kaitlin
Publisher: name: University of Kentucky Libraries
Year: 2020
Subjects: subject: FOS: Educational sciences

description: Inclusive classrooms consist of students with and without disabilities. It is often difficult for teachers to find ways to incorporate all students equally in classroom discussions. Often students with disabilities tend to participate less than their typically developing peers. For teachers to be effective in their classroom it is important for them to follow high leverage practices. One high-leverage practice strategy for teachers to incorporate in their classroom is the use of response cards (RCs). Response cards are evidence-based practices for increasing active engagement, academic achievement, on-task behavior, as well as decreasing problem behaviors. In order for students to have more opportunities to respond, general education teachers, special education teachers, and related-service providers, should collaborate to plan, implement, and evaluate the use of response cards. The purpose of this article is to provide descriptions of different types of RCs, as well as provide information on how to plan for using RCs, create instructional procedures for implementation, and provide steps to creating an evaluation system that should be used when using RCs.
description: © 2020 Kaitlin Ayers
Synthesis of 2-amino-3-cyano 4-H-chromenes containing quinoline in water computational study on substituent effects
Creators: name: Shiri, Morteza
name: Heravi, Majid Mommahed
name: Tayebeh Hosseinnejad
name: Faghihi, Zeinab
name: Mahdiyeh Vazinfard
Publisher: name: figshare
Year: 2020
Subjects: subject: 30205 Non-metal Chemistry
subject: FOS: Chemical sciences
subject: 30503 Organic Chemical Synthesis
subject: Organic Chemistry
subject: 30504 Organic Green Chemistry
subject: 39904 Organometallic Chemistry
subject: 30207 Transition Metal Chemistry
subject: 30306 Synthesis of Materials

description: An efficient, high yielding and environmentally benign strategy to the synthesis of new 2amino-3-cyano-4H-chromene derivatives, via one-pot three-component reaction involving malononitrile, various α- or β-naphthol and appropriate aromatic aldehydes including 2chloroquinoline3-carbaldehydes in the presence of morpholine in water, was achieved. During the development of the synthesis five new chromene derivatives were fruitfully synthesized. It was found that employing this approach, aromatic aldehydes bearing electron-withdrawing groups give higher yields of the corresponding products in shorter reaction times. This observation was in agreement with topological analysis of calculated electron density functions using density functional theory and quantum theory of atoms in molecules approaches.
The Horizontal Branch of the Sculptor Dwarf galaxy
Creators: name: Salaris, Maurizio
name: de Boer, Thomas
name: Tolstoy, Eline
name: Fiorentino, Giuliana
name: Cassisi, Santi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have performed the first detailed simulation of the horizontal branch of the Sculptor dwarf spheroidal galaxy by means of synthetic modelling techniques,taking consistently into account the star formation history and metallicity evolution as determined from the main sequence and red giant branch spectroscopic observations. The only free parameter in the whole analysis is the integrated mass loss of red giant branch stars. This is the first time that synthetic horizontal branch models, consistent with the complex star formation history of a galaxy, are calculated and matched to the observations. We find that the metallicity range covered by the star formation history, as constrained by observations, plus a simple mass loss law, enable us to cover both the full magnitude and colour range of HB stars. In addition the number count distribution along the observed horizontal branch, can be also reproduced, provided that the red giant branch mass loss is mildly metallicity dependent, with a very small dispersion at fixed metallicity. The magnitude, metallicity and period distribution of the RR Lyrae stars are also well reproduced. There is no excess of bright objects that require enhanced-He models. The lack of signatures of enhanced-He stars along the horizontal branch is consistent with the lack of the O-Na anticorrelation observed in Sculptor and other dwarf galaxies, and confirms the intrinsic difference between Local Group dwarf galaxies and globular cluster populations. We also compare the brightness of the observed red giant branch bump with the synthetic counterpart, and find a discrepancy -- the theoretical bump being brighter -- similar to what is observed in Galactic globular clusters.
description: 10 pages, 9 figures, Astronomy & Astrophysics, in press
Correlation MTM Procedure
Creators: name: Lee, David
Publisher: name: Zenodo
Year: 2022
Subjects: Correlation MTM Procedure

description: In an attempt to make the valuation of CDO trades more consistent with market conditions, a new method for implying these correlations from the tracer market has been proposed. The methodology involves two steps: implying a correlation from the tracer market and then mapping the actual trades to these tranches to determine the implied correlation used to value these.
description: https://ia601408.us.archive.org/0/items/quanto-himalaya/QuantoHimalaya.pdf
Biodiesel oil production from waste cooking oil by using the pilot plant-scale solar reactor for the local community in Thailand
Creators: name: Wuttichai Roschat
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: Biodiesel oil production, Waste cooking oil, Pilot scale-solar reactor, Liquid biofuel

description: Asia-Pacific Journal of Science and Technology, 28, 4, 10
An Investigation of Various Types of Arc Welded Joints
Creators: name: Anderson, Henry Pierce
name: Krelle, William Hay
Publisher: name: California Institute of Technology
Year: 1927
Subjects: subject: Civil Engineering
subject: FOS: Civil engineering

description: In the last few years there has been much discussion as to the relative merits or arc welded joints as compared to riveted joints. There is an old precedent which must be removed before arc welding will come into its own. The purpose of this paper is to help establish confidence in this process of fabrication with special regard to strength and reliability.
A high-throughput Computer Tomography-based Holographic Two-Photon Polymerization (TPP) method for Multi-Material (Wavelength-Selective/CurbCure/Upconversion) additive manufacturing under Continuous Phases (CT-MMW/CC-TPP4DAM-CP)
Creators: name: MENG, (Keys tiger) Hu
Publisher: name: figshare
Year: 2022

description: A high-throughput Computer Tomography-based Holographic Two-Photon Polymerization (TPP) method for Multi-Material (Wavelength-Selective/CurbCure/Upconversion) additive manufacturing under Continuous Phases (CT-MMW/CC-TPP4DAM-CP)
Sensitivity of the NOy budget over the United States to anthropogenic and lightning NOx in summer
Creators: name: Fang, Yuanyuan
name: Fiore, Arlene M.
name: Horowitz, L. W.
name: Levy II, H.
name: Hu, Y.
name: Russell, A. G.
Publisher: name: Columbia University
Year: 2010
Subjects: subject: Climatic changes--Effect of human beings on
subject: Nitrogen oxides--Environmental aspects
subject: Lightning
subject: Tropospheric chemistry
subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Climatic changes
subject: Atmospheric chemistry

description: We examine the implications of new estimates of the anthropogenic and lightning nitrogen oxide (NOx) source for the budget of oxidized nitrogen (NOy) over the United States in summer using a 3-D global chemical transport model (Model of Ozone and Related Tracers-4). As a result of the Environmental Protection Agency (EPA) State Implementation call, power plant NOx emissions over the eastern United States decreased significantly, as reflected by a 23% decrease in summer surface emissions from the 1999 U.S. EPA National Emissions Inventory to our 2004 inventory. We increase the model lightning NOx source over northern midlatitude continents (by a factor of 10) and the fraction emitted into the free troposphere (FT, from 80% to 98%) to better match the recent observation-based estimates. While these NOx source updates improve the simulation of NOx and O3 compared to the Intercontinental Chemical Transport Experiment-North America aircraft observations, a bias in the partitioning between nitric acid (HNO3) and peroxyacetylnitrate (PAN) remains especially above 8 km, suggesting gaps in the current understanding of upper tropospheric processes. We estimate a model NOy export efficiency of 4%−14% to the North Atlantic in the FT, within the range of previous plume-based estimates (3%−20%) and lower than the 30% exported directly from the continental boundary layer. Lightning NOx contributes 24%−43% of the FT NOy export from the U.S. to the North Atlantic and 28%−34% to the NOy wet deposition over the United States, with the ranges reflecting different assumptions. Increasing lightning NOx decreases the fractional contribution of PAN to total NOy export, increases the O3 production in the northern extratropical FT by 33%, and decreases the regional mean ozone production efficiency per unit NOx (OPE) by 30%. If models underestimate the lightning NOx source, they would overestimate the background OPE in the FT and the fractional contribution of PAN to NOy export. Therefore, a model underestimate of lightning NOx would likely lead to an overestimate of the downwind O3 production due to anthropogenic NOx export. Better constraints on the lightning NOx source are required to more confidently assess the impacts of anthropogenic emissions and their changes on air quality over downwind regions.
Increasing background ozone in surface air over the United States
Creators: name: Lin, C.-Y. Cynthia
name: Jacob, Daniel J.
name: Munger, J. William
name: Fiore, Arlene M.
Publisher: name: Columbia University
Year: 2000
Subjects: Ozone
Air quality--Standards
Tropospheric chemistry
Climatic changes
Atmospheric chemistry

description: The long-term trend of background O3 in surface air over the United States from 1980 to 1998 is examined using monthly probability distributions of daily maximum 8-hour average O3 concentrations at a large ensemble of rural sites. Ozone concentrations have decreased at the high end of the probability distribution (reflecting emission controls) but have increased at the low end. The cross-over takes place between the 30th and 50th percentiles in May–August and between the 60th and 90th percentiles during the rest of the year. The increase is statistically significant at a 5% level in spring and fall, when it is 3–5 ppbv. The maximum increase is in the Northeast. A possible explanation is an increase in the O3 background transported from outside the United States. Better understanding of the causes of the increase is needed because of its implications for meeting O3 air quality standards.
A Hybrid Linear Logic for Constrained Transition Systems with Applications to Molecular Biology
Creators: name: Chaudhuri, Kaustuv
name: Despeyroux, Joelle
Publisher: name: arXiv
Year: 2013
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Linear implication can represent state transitions, but real transition systems operate under temporal, stochastic or probabilistic constraints that are not directly representable in ordinary linear logic. We propose a general modal extension of intuitionistic linear logic where logical truth is indexed by constraints and hybrid connectives combine constraint reasoning with logical reasoning. The logic has a focused cut-free sequent calculus that can be used to internalize the rules of particular constrained transition systems; we illustrate this with an adequate encoding of the synchronous stochastic pi-calculus. We also present some preliminary experiments of direct encoding of biological systems in the logic.
The effect of Bpsl0279 mutation on biofilm formation in Burkholderia pseudomallei
Creators: name: Surasakdi Wongratanacheewin
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: YcgR1, Biofilm, Burkholderia pseudomallei, Mutagenesis, Flow cell, Bpsl0279

description: Asia-Pacific Journal of Science and Technology, 28, 4, 15
Nuclear PDFs in the beginning of the LHC era
Creators: name: Paukkunen, Hannu
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The status of the global fits of nuclear parton distributions (nPDFs) is reviewed. In addition to comparing the contemporary analyses of nPDFs, difficulties and controversies posed by the neutrino-nucleus deeply inelastic scattering data is overviewed. At the end, the first dijet data from the LHC proton+lead collisions is briefly discussed.
description: Transcription of the talk given in the IS2013 conference, Isla de la Toja, Spain. Revised version. To appear in Nuclear Physics A
Stability of Satellites in Closely Packed Planetary Systems
Creators: name: Payne, Matthew J.
name: Deck, Katherine M.
name: Holman, Matthew J.
name: Perets, Hagai B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We perform numerical integrations of four-body (star, planet, planet, satellite) systems to investigate the stability of satellites in planetary Systems with Tightly-packed Inner Planets (STIPs). We find that the majority of closely-spaced stable two-planet systems can stably support satellites across a range of parameter-space which is only slightly decreased compared to that seen for the single-planet case. In particular, circular prograde satellites remain stable out to $\sim 0.4 R_H$ (where $R_H$ is the Hill Radius) as opposed to $\sim 0.5 R_H$ in the single-planet case. A similarly small restriction in the stable parameter-space for retrograde satellites is observed, where planetary close approaches in the range 2.5 to 4.5 mutual Hill radii destabilize most satellites orbits only if $a\sim 0.65 R_H$. In very close planetary pairs (e.g. the 12:11 resonance) the addition of a satellite frequently destabilizes the entire system, causing extreme close-approaches and the loss of satellites over a range of circumplanetary semi-major axes. The majority of systems investigated stably harbored satellites over a wide parameter-space, suggesting that STIPs can generally offer a dynamically stable home for satellites, albeit with a slightly smaller stable parameter-space than the single-planet case. As we demonstrate that multi-planet systems are not a priori poor candidates for hosting satellites, future measurements of satellite occurrence rates in multi-planet systems versus single-planet systems could be used to constrain either satellite formation or past periods of strong dynamical interaction between planets.
description: 11 pages, 5 figures. Accepted for publication, ApJL
Synthesis of Linde Type A zeolite from Darazo kaolin found in Bauchi State, Nigeria
Creators: name: Ikenna Ekpe
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: Darazo, Hydrothermal method, Kaolin, Metakaolin, Zeolite

description: Asia-Pacific Journal of Science and Technology, 28, 4, 7
Disentangling dynamical phase transitions from equilibrium phase transitions
Creators: name: Vajna, Szabolcs
name: Dóra, Balázs
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Dynamical phase transitions (DPT) occur after quenching some global parameters in quantum systems and are signalled by the non-analytical time evolution of the dynamical free energy, which is calculated from the Loschmidt overlap between the initial and time evolved states. In a recent letter (M. Heyl et al., Phys. Rev. Lett. \textbf{110}, 135704 (2013)), it was suggested that DPTs are closely related to equilibrium phase transitions (EPT) for the transverse field Ising model. By studying a minimal model, the XY chain in transverse magnetic field, we show analytically that this connection does not hold generally. We present examples where DPT occurs without crossing any equilibrium critical lines by the quench, and a nontrivial example with no DPT but crossing a critical line by the quench. Albeit the non-analyticities of the dynamical free energy on the real time axis do not indicate the presence or absence of an EPT, the structure of Fisher-lines for complex times reveal a qualitative difference.
description: 5+1 pages, 3+1 figures; typos corrected
Genetic variation of wild Bulbophyllum reclusum Seidenf. in Northeast Thailand based on chloroplast matK sequence analysis
Creators: name: Sudarat Thanonkeo
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: Bulbophyllum reclusum, Genetic variation, MatK gene, Orchid

description: Asia-Pacific Journal of Science and Technology, 28, 4, 7
Knihovna jako partner při využití a prezentaci dat z Web of Science
Creators: name: Korhoňová, Lucie
Publisher: name: Zenodo
Year: 2023
Subjects: BA2023

description: Prezentováno na konferenci Bibliotheca academica 2023.
description: Příspěvek přiblíží spolupráci Ústřední knihovny ČVUT s odborem rozvoje na projektu, který má za cíl představit úspěchy univerzity zahraničním zájemcům o studium nebo vědcům. Příspěvek dále popisuje další služby knihovny v oblasti bibliometrie pro své vědce a akademiky.
Observational constraints on the chemistry of isoprene nitrates over the eastern United States
Creators: name: Horowitz, Larry W.
name: Fiore, Arlene M.
name: Milly, George P.
name: Cohen, Ronald C.
name: Perring, Anne
name: Wooldridge, Paul J.
name: Hess, Peter G.
name: Emmons, Louisa K.
name: Lamarque, Jean-François
Publisher: name: Columbia University
Year: 2007
Subjects: subject: Boundary layer
subject: Nitrates
subject: Tropospheric chemistry--Mathematical models
subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Climatic changes
subject: Atmospheric chemistry

description: The formation of organic nitrates during the oxidation of the biogenic hydrocarbon isoprene can strongly affect boundary layer concentrations of ozone and nitrogen oxides (NOx = NO + NO2). We constrain uncertainties in the chemistry of these isoprene nitrates using chemical transport model simulations in conjunction with observations over the eastern United States from the International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) field campaign during summer 2004. The model best captures the observed boundary layer concentrations of organic nitrates and their correlation with ozone using a 4% yield of isoprene nitrate production from the reaction of isoprene hydroxyperoxy radicals with NO, a recycling of 40% NOx when isoprene nitrates react with OH and ozone, and a fast dry deposition rate of isoprene nitrates. Simulated boundary layer concentrations are only weakly sensitive to the rate of photochemical loss of the isoprene nitrates. An 8% yield of isoprene nitrates degrades agreement with the observations somewhat, but concentrations are still within 50% of observations and thus cannot be ruled out by this study. Our results indicate that complete recycling of NOx from the reactions of isoprene nitrates and slow rates of isoprene nitrate deposition are incompatible with the observations. We find that ∼50% of the isoprene nitrate production in the model occurs via reactions of isoprene (or its oxidation products) with the NO3 radical, but note that the isoprene nitrate yield from this pathway is highly uncertain. Using recent estimates of rapid reaction rates with ozone, 20–24% of isoprene nitrates are lost via this pathway, implying that ozonolysis is an important loss process for isoprene nitrates. Isoprene nitrates are shown to have a major impact on the nitrogen oxide (NOx = NO + NO2) budget in the summertime U.S. continental boundary layer, consuming 15–19% of the emitted NOx, of which 4–6% is recycled back to NOx and the remainder is exported as isoprene nitrates (2–3%) or deposited (8–10%). Our constraints on reaction rates, branching ratios, and deposition rates need to be confirmed through further laboratory and field measurements. The model systematically underestimates free tropospheric concentrations of organic nitrates, indicating a need for future investigation of the processes controlling the observed distribution.
Erosion of dust aggregates
Creators: name: Seizinger, Alexander
name: Krijt, Sebastiaan
name: Kley, Wilhelm
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Aims: The aim of this work is to gain a deeper insight into how much different aggregate types are affected by erosion. Especially, it is important to study the influence of the velocity of the impacting projectiles. We also want to provide models for dust growth in protoplanetary disks with simple recipes to account for erosion effects. Methods: To study the erosion of dust aggregates we employed a molecular dynamics approach that features a detailed micro-physical model of the interaction of spherical grains. For the first time, the model has been extended by introducing a new visco-elastic damping force which requires a proper calibration. Afterwards, different sample generation methods were used to cover a wide range of aggregate types. Results: The visco-elastic damping force introduced in this work turns out to be crucial to reproduce results obtained from laboratory experiments. After proper calibration, we find that erosion occurs for impact velocities of 5 m/s and above. Though fractal aggregates as formed during the first growth phase are most susceptible to erosion, we observe erosion of aggregates with rather compact surfaces as well. Conclusions: We find that bombarding a larger target aggregate with small projectiles results in erosion for impact velocities as low as a few m/s. More compact aggregates suffer less from erosion. With increasing projectile size the transition from accretion to erosion is shifted to higher velocities. This allows larger bodies to grow through high velocity collisions with smaller aggregates.
description: accepted for publication in Astronomy & Astrophysics
The impacts of changing transport and precipitation on pollutant distributions in a future climate
Creators: name: Fang, Yuanyuan
name: Fiore, Arlene M.
name: Horowitz, Larry W.
name: Gnanadesikan, Anand
name: Held, Isaac
name: Chen, Gang
name: Vecchi, Gabriel
name: Levy, Hiram
Publisher: name: Columbia University
Year: 2011
Subjects: subject: Air--Pollution--Measurement
subject: Climatic changes--Forecasting
subject: Climatic changes--Mathematical models
subject: Tropospheric chemistry
subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Climatic changes
subject: Atmospheric chemistry

description: Air pollution (ozone and particulate matter in surface air) is strongly linked to synoptic weather and thus is likely sensitive to climate change. In order to isolate the responses of air pollutant transport and wet removal to a warming climate, we examine a simple carbon monoxide–like (CO) tracer (COt) and a soluble version (SAt), both with the 2001 CO emissions, in simulations with the Geophysical Fluid Dynamics Laboratory chemistry-climate model (AM3) for present (1981–2000) and future (2081–2100) climates. In 2081–2100, projected reductions in lower-tropospheric ventilation and wet deposition exacerbate surface air pollution as evidenced by higher surface COt and SAt concentrations. However, the average horizontal general circulation patterns in 2081–2100 are similar to 1981–2000, so the spatial distribution of COt changes little. Precipitation is an important factor controlling soluble pollutant wet removal, but the total global precipitation change alone does not necessarily indicate the sign of the soluble pollutant response to climate change. Over certain latitudinal bands, however, the annual wet deposition change can be explained mainly by the simulated changes in large-scale (LS) precipitation. In regions such as North America, differences in the seasonality of LS precipitation and tracer burdens contribute to an apparent inconsistency of changes in annual wet deposition versus annual precipitation. As a step toward an ultimate goal of developing a simple index that can be applied to infer changes in soluble pollutants directly from changes in precipitation fields as projected by physical climate models, we explore here a “Diagnosed Precipitation Impact” (DPI) index. This index captures the sign and magnitude (within 50%) of the relative annual mean changes in the global wet deposition of the soluble pollutant. DPI can only be usefully applied in climate models in which LS precipitation dominates wet deposition and horizontal transport patterns change little as climate warms. Our findings support the need for tighter emission regulations, for both soluble and insoluble pollutants, to obtain a desired level of air quality as climate warms.
Coating of seasonings in deep-fried banana chips by electrostatic and non-electrostatic coating processes
Creators: name: Khongsak Srikaeo
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: Electrostatic coating, Banana chip, Adhesion, Coating evenness, Image analysis

description: Asia-Pacific Journal of Science and Technology, 28, 4, 8
Chemical and biological properties of organic fertilizer products from Azolla and other organic wastes
Creators: name: Nguyen K. Nghia
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: Azolla, Compost, C/N, Organic fertilizer, Organic wastes, Vermi-compost

description: Asia-Pacific Journal of Science and Technology, 28, 4, 11
Synthesis of four series of quinoline-based heterocycles by reacting 2-chloroquinoline-3-carbonitriles with various types of isocyanides
Creators: name: Shiri, Morteza
name: Tanbakouchian, Zahra
name: Zolfigol, Mohammad Ali
name: Notash, Behrouz
name: Ranjbar, Maryam
Publisher: name: figshare
Year: 2020
Subjects: subject: 30205 Non-metal Chemistry
subject: FOS: Chemical sciences
subject: 30303 Optical Properties of Materials
subject: 30503 Organic Chemical Synthesis
subject: 30599 Organic Chemistry not elsewhere classified
subject: 30504 Organic Green Chemistry
subject: 30207 Transition Metal Chemistry
subject: 30306 Synthesis of Materials

description: Four distinct sets of functionalized quinolines were synthesized by reacting 2chloroquinoline‐3‐carbonitriles with various types of isocyanides under appropriate conditions. The palladium‐catalysed reaction of less hindered aliphatic and aromatic isocyanides with 2‐chloroquinoline‐3‐carbonitriles yielded 2‐alkyl(aryl)‐1‐imino‐1Hpyrrolo[3,4‐b]quinolin‐3(2H)‐one derivatives; however, the catalysed reaction of more hindered isocyanides such as tert‐butyl isocyanide produced the corresponding 3cyanoquinoline‐2carboxamides. Interestingly, chloroquinoline‐3‐carbonitriles reacted with ethyl isocyanoacetate in the presence of Cs2CO3 to generate imidazo[1,5a]quinoline derivatives; notably, tosylmethyl isocyanide under the same conditions formed unprecedented 2‐tosyl‐3‐cyanoquinolines.
Discovery of the Third Transient X-ray Binary in the Galactic Globular Cluster Terzan 5
Creators: name: Bahramian, Arash
name: Heinke, Craig O.
name: Sivakoff, Gregory R.
name: Altamirano, Diego
name: Wijnands, Rudy
name: Homan, Jeroen
name: Linares, Manuel
name: Pooley, David
name: Degenaar, Nathalie
name: Gladstone, Jeanette C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report and study the outburst of a new transient X-ray binary (XRB) in Terzan 5, the third detected in this globular cluster, Swift J174805.3-244637 or Terzan 5 X-3. We find clear spectral hardening in Swift/XRT data during the outburst rise to the hard state, thanks to our early coverage (starting at L_X ~ 4x10^{34} ergs/s) of the outburst. This hardening appears to be due to the decline in relative strength of a soft thermal component from the surface of the neutron star (NS) during the rise. We identify a {Type I X-ray burst} in Swift/XRT data with a long (16 s) decay time, indicative of {hydrogen burning on the surface of the} NS. We use Swift/BAT, Maxi/GSC, Chandra/ACIS, and Swift/XRT data to study the spectral changes during the outburst, identifying a clear hard-to-soft state transition. We use a Chandra/ACIS observation during outburst to identify the transient's position. Seven archival Chandra/ACIS observations show evidence for variations in Terzan 5 X-3's non-thermal component, but not the thermal component, during quiescence. The inferred long-term time-averaged mass accretion rate, from the quiescent thermal luminosity, suggests that if this outburst is typical and only slow cooling processes are active in the neutron star core, such outbursts should recur every ~10 years.
description: ApJ in press
Základy a záhady: Pohledy vědců na otevřená data
Creators: name: Steiner, Ludvík
Publisher: name: Zenodo
Year: 2023
Subjects: BA2023

description: Prezentováno na konferenci Bibliotheca academica 2023.
description: Prezentace se soustřeďuje na reakce akademiků a vědců z různých součástí Technické univerzity v Liberci na nové povinnosti spojené s otevřenými daty. Popisuje proběhlé semináře a dlouhý proces vzniku jedné směrnice.
Effect of solvent types in chitosan-based nanocomposite coating on internal quality and eggshell morphology
Creators: name: Shurmasti, Dariush Khademi
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: Chitosan, Eggshell morphology, Montmorillonite, Shelf life, Solvent

description: Asia-Pacific Journal of Science and Technology, 28, 4, 8
Transport of radon-222 and methyl iodide by deep convection in the GFDL Global Atmospheric Model AM2
Creators: name: Donner, Leo J.
name: Horowitz, Larry W.
name: Fiore, Arlene M.
name: Seman, Charles J.
name: Blake, Donald R.
name: Blake, Nicola J.
Publisher: name: Columbia University
Year: 2007
Subjects: Convection (Meteorology)
Atmospheric chemistry--Mathematical models
Meteorology
Climatic changes
Atmospheric chemistry

description: Transport of radon-222 and methyl iodide by deep convection is analyzed in the Geophysical Fluid Dynamics Laboratory (GFDL) Atmospheric Model 2 (AM2) using two parameterizations for deep convection. One of these parameterizations represents deep convection as an ensemble of entraining plumes; the other represents deep convection as an ensemble of entraining plumes with associated mesoscale updrafts and downdrafts. Although precipitation patterns are generally similar in AM2 with both parameterizations, the deep convective mass fluxes are more than three times larger in the middle- to upper troposphere for the parameterization consisting only of entraining plumes, but do not extend across the tropopause, unlike the parameterization including mesoscale circulations. The differences in mass fluxes result mainly from a different partitioning between convective and stratiform precipitation; the parameterization including mesoscale circulations detrains considerably more water vapor in the middle troposphere and is associated with more stratiform rain. The distributions of both radon-222 and methyl iodide reflect the different mass fluxes. Relative to observations (limited by infrequent spatial and temporal sampling), AM2 tends to simulate lower concentrations of radon-222 and methyl iodide in the planetary boundary layer, producing a negative model bias through much of the troposphere, with both cumulus parameterizations. The shapes of the observed profiles suggest that the larger deep convective mass fluxes and associated transport in the parameterization lacking a mesoscale component are less realistic.
Comparative study of peat properties in Johore Malaysia
Creators: name: Mohd Khaidir Abu Talib
Publisher: name: Asia-Pacific Journal of Science and Technology
Year: 2023
Subjects: Johore peat, Fibric peat, Hemic peat, Sapric peat, Decomposition, Index properties

description: Asia-Pacific Journal of Science and Technology, 28, 4, 8
Impact of meteorology and emissions on methane trends, 1990–2004
Creators: name: Fiore, Arlene M.
name: Horowitz, Larry W.
name: Dlugokencky, Edward J.
name: West, J. Jason
Publisher: name: Columbia University
Year: 2006
Subjects: Climatic changes
Atmospheric methane
Tropospheric chemistry--Mathematical models
Atmospheric chemistry
Meteorology

description: Over the past century, atmospheric methane (CH4) rose dramatically before leveling off in the late 1990s. The processes controlling this trend are poorly understood, limiting confidence in projections of future CH4. The MOZART-2 global tropospheric chemistry model qualitatively captures the observed CH4 trend (increasing in the early 1990s and then leveling off) with constant emissions. From 1991–1995 to 2000–2004, the CH4 lifetime versus tropospheric OH decreases by 1.6%, reflecting increases in OH and temperature. The rise in OH stems from an increase in lightning NOx as parameterized in the model. A simulation including annually varying anthropogenic and wetland CH4 emissions, as well as the changes in meteorology, best reproduces the observed CH4 distribution, trend, and seasonal cycles. Projections of future CH4 abundances should consider climate-driven changes in CH4 sources and sinks.
Cross-correlation between cosmic microwave background lensing and galaxy intrinsic alignment as a contaminant to gravitational lensing cross-correlated probes of the universe
Creators: name: Troxel, M. A.
name: Ishak, Mustapha
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We introduce here a cross-correlation term between CMB lensing and galaxy intrinsic alignment, noted hereby as $ϕI$. This effect acts as a contaminant to the cross-correlation between CMB lensing and galaxy lensing. The latter cross-correlation has recently been detected for the first time, and measurements will greatly improve as the area of overlap between galaxy and CMB surveys increases and measurements of the CMB polarization become more significant. This will constitute a powerful probe for studying the structure and evolution of the universe. The magnitude of the $ϕI$ term is found to be about 15% of the pure CMB lensing-galaxy lensing component and acts to reduce the magnitude of its measured spectrum. This offset in the spectrum will strongly impact its use for precision cosmological study if left unmitigated. We also propose here a method to calibrate this $ϕI$ contamination through use of a scaling relation that allows one to reduce the impact of $ϕI$ by a factor of 20 or more in all redshift bins, which would reduce its magnitude down to detection limits in almost all cases. This will allow the full use of this probe for precision cosmology.
description: 7 pages, 4 figures, matches version published in PRD
Projecting policy – relevant metrics for high summertime ozone pollution events over the 1 Eastern United States due to climate and emission changes during the 21st century
Creators: name: Rieder, Harald
name: Fiore, Arlene M.
name: Horowitz, Larry W.
name: Naik, Vaishali
Publisher: name: Columbia University
Year: 2015
Subjects: subject: Climatic changes
subject: Air quality management
subject: Nitrogen oxides--Environmental aspects
subject: Tropospheric chemistry--Mathematical models
subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Atmospheric chemistry

description: Over the eastern United States (EUS), nitrogen oxides (NOx) emission controls have led to improved air quality over the past two decades, but concerns have been raised that climate warming may offset some of these gains. Here we analyze the effect of changing emissions and climate, in isolation and combination, on EUS summertime surface ozone (O3) over the recent past and the 21st century in an ensemble of simulations performed with the Geophysical Fluid Dynamics Laboratory CM3 chemistry-climate model. The simulated summertime EUS O3 is biased high but captures the structure of observed changes in regional O3 distributions following NOx emission reductions. We introduce a statistical bias correction, which allows derivation of policy-relevant statistics by assuming a stationary mean state bias in the model, but accurate simulation of changes at each quantile of the distribution. We contrast two different 21st century scenarios: (i) representative concentration pathway (RCP) 4.5 and (ii) simulations with well-mixed greenhouse gases (WMGG) following RCP4.5 but with emissions of air pollutants and precursors held fixed at 2005 levels (RCP4.5_WMGG). We find under RCP4.5 no exceedance of maximum daily 8 hour average ozone above 75 ppb by mid-21st century, reflecting the U.S. NOx emissions reductions projected in RCP4.5, while more than half of the EUS exceeds this level by the end of the 21st century under RCP4.5_WMGG. Further, we find a simple relationship between the changes in estimated 1 year return levels and regional NOx emission changes, implying that our results can be generalized to estimate changes in the frequency of EUS pollution events under different regional NOx emission scenarios.
Communicating the Value of the Medical Library Early and Often at a School of Public Health
Creators: name: Biondo, Del
Publisher: name: Zenodo
Year: 2022
Subjects: library marketing
medical librarianship
library outreach

description: At the Medical Library Association Annual Conference in May 2022, Kayla shared the process she went through to analyze the websites of six schools of public health to see if and how they communicated the value that their medical library and public health liaison librarian(s) bring to the student experience. Kayla discussed the marketing statements she developed to target prospective students, current students, and alumni that would promote the medical library’s numerous services as well as the dedicated support of its two public health librarians, as well as her collaborations with Assistant Dean for Public Relations at Yale School of Public Health.