cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Origin of the multiferroic spiral spin-order in the RMnO3 perovskites
Creators: name: Dong, Shuai
name: Yu, Rong
name: Yunoki, Seiji
name: Liu, J. -M.
name: Dagotto, Elbio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The origin of the spiral spin-order in perovskite multiferroic manganites $R$MnO$_{3}$ ($RE=$ Tb or Dy) is here investigated using a two $e_{\rm g}$-orbitals double-exchange model. Our main result is that the experimentally observed spiral phase can be stabilized by introducing a relatively weak next-nearest-neighbor superexchange coupling ($\sim10%$ of the nearest-neighbor superexchange). Moreover, the Jahn-Teller lattice distortion is also shown to be essential to obtain a realistic spiral period. Supporting our conclusions, the generic phase diagram of undoped perovskite manganites is obtained using Monte Carlo simulations, showing phase transitions from the A-type antiferromagnet, to the spiral phase, and finally to the E-type antiferromagnet, with decreasing size of the $R$ ions. These results are qualitatively explained by the enhanced relative intensity of the superexchanges.
description: 6 pages, 4 figures
Evaluation of phytochemical content, antioxidant, antimicrobial activity and DNA cleavage effect of endemic Linaria corifolia Desf. (Plantaginaceae)
Creators: name: Gul, Melek
name: Ilkay Ozturk Cali
name: Cansaran, Arzu
name: Onder Idil
name: Irem Kulu
name: Celikoglu, Umut
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy
subject: Plant Biology

description: The aim of this study is to isolate Linaria corifolia Desf. (Plantaginaceae) and identify new apigenine derivatives 6,3′-dimethoxyapigenin-7-O-[(rhamnosyl)-(1–2)-6″-acetyl glucoside]. Moreover, we analyzed biological activity and flavonoids by using HPLC methods from extracts. The L. corifolia Desf. samples were collected in Black Sea Region of Turkey. Ethanol (EtOH), ethyl acetate (EtOAc) and dichloromethane (DCM) extracts in aerial and under solid parts of plant were evaluated for antioxidant, antimicrobial activity and effect of DNA cleavage. Quercetin, gallic acid and catechin as flavonoids were identified in EtOH, EtOAc, DCM extracts.
Detecting and reconstructing gravitational waves from the next Galactic core-collapse supernova in the Advanced Detector Era
Creators: name: Szczepanczyk, Marek
name: Antelis, Javier
name: Benjamin, Michael
name: Cavaglia, Marco
name: Gondek-Rosinska, Dorota
name: Hansen, Travis
name: Klimenko, Sergey
name: Morales, Manuel
name: Moreno, Claudia
name: Mukherjee, Soma
name: Nurbek, Gaukhar
name: Powell, Jade
name: Singh, Neha
name: Sitmukhambetov, Satzhan
name: Szewczyk, Pawel
name: Westhouse, Jonathan
name: Valdez, Oscar
name: Vedovato, Gabriele
name: Zheng, Yanyan
name: Zanolin, Michele
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We performed a detailed analysis of the detectability of a wide range of gravitational waves derived from core-collapse supernova simulations using gravitational-wave detector noise scaled to the sensitivity of the upcoming fourth and fifth observing runs of the Advanced LIGO, Advanced Virgo, and KAGRA. We use the coherent WaveBurst algorithm, which was used in the previous observing runs to search for gravitational waves from core-collapse supernovae. As coherent WaveBurst makes minimal assumptions on the morphology of a gravitational-wave signal, it can play an important role in the first detection of gravitational waves from an event in the Milky Way. We predict that signals from neutrino-driven explosions could be detected up to an average distance of 10 kpc, and distances of over 100 kpc can be reached for explosions of rapidly rotating progenitor stars. An estimated minimum signal-to-noise ratio of 10-25 is needed for the signals to be detected. We quantify the accuracy of the waveforms reconstructed with coherent WaveBurst and we determine that the most challenging signals to reconstruct are those produced in long-duration neutrino-driven explosions and models that form black holes a few seconds after the core bounce.
description: 20 pages, 12 figures, 3 tables
Synthesis, characterization and biological activity studies of certain 1-((benzo[d]thiazol-2-yl) methyl)-4,5-dihydro-3-methyl-N-phenyl-1H-pyrazol-5-imine and 2-((5-aryl-1H-1,2,4-triazol-3-yl) methyl)benzo[d]thiazoles
Creators: name: Pathki Uma
name: Kamatala Chinna Rajanna
name: Firasath Unnisa
name: Pondichery Kuppuswamy Saiprakash
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Neuroscience
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Plant Biology
subject: FOS: Biological sciences

description: In this work, 1-((benzo[d]thiazol-2-yl)methyl)-4,5-dihydro-3-methyl-N-phenyl-1H-pyrazol-5-imine (3a-h) have been successfully synthesized from the condensation of 2-((Benzo[d]thiazol-2-1-((benzo[d]thiazol-2-yl)methyl)-3-methyl-1H-pyrazol-5(4H)-one (2) with different aromatic amines. On the other hand, in another protocol, cyclization of 2-(benzo[d]thiazol-2-yl) acetohydrazide (4) with different aromatic aldehydes afforded 2-((5-aryl-1H-1,2,4-triazol-3-yl)methyl)benzo[d]thiazoles (5a-h). A perusal of the biological activity studies revealed that the derivatives having chlorine as substituent are more toxic to all six bacteria. Among the chloro group compounds, the compound which has methoxy group is more toxic.
Ionic liquid mediated and promoted one-pot green synthesis of new isoxazolyl dihydro-1H-indol-4(5H)-one derivatives at ambient temperature
Creators: name: Modugu, Nagi Reddy
name: Pittala, Praveen Kumar
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: 110309 Infectious Diseases

description: We report a mild, inexpensive, fast, highly efficient, and eco-friendly protocol for the synthesis of new isoxazolyl dihydro-1H-indol-4(5H)-ones by a catalyst-free, one-pot three-component reaction of 4-amino-3-methyl-5-styrylisoxazoles, dimedone, and 2-chloroacetophenones under 1-methyl imidazolium tetraflouroborate ([HMIm]BF4) as task-specific ionic liquid at room temperature. The important aspects of the present methodology are: use of green solvent, short reaction time, catalyst free, compatibility with wide range of substrates, ease of recovery, reusability of reaction medium, and good yields.
Central charges of N=2 superconformal field theories in four dimensions
Creators: name: Shapere, Alfred D.
name: Tachikawa, Yuji
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a general method for computing the central charges a and c of N=2 superconformal field theories corresponding to singular points in the moduli space of N=2 gauge theories. Our method relates a and c to the U(1)_R anomalies of the topologically twisted gauge theory. We evaluate these anomalies by studying the holomorphic dependence of the path integral measure on the moduli. We calculate a and c for superconformal points in a variety of gauge theories, including N=4 SU(N), N=2 pure SU(N) Yang-Mills, and USp(2N) with 1 massless antisymmetric and 4 massive fundamental hypermultiplets. In the latter case, we reproduce the conformal and flavor central charges previously calculated using the gravity duals of these gauge theories. For any SCFT in the class under consideration, we derive a previously conjectured expression for 2a-c in terms of the sum of the dimensions of operators parameterizing the Coulomb branch. Finally, we prove that the ratio a/c is bounded above by 5/4 and below by 1/2.
description: 38 pages, 1 figure; v2: References added, a minor error corrected. Published version
Oxygen False Positives on Habitable Zone Planets Around Sun-Like Stars
Creators: name: Krissansen-Totton, Joshua
name: Fortney, Jonathan J.
name: Nimmo, Francis
name: Wogan, Nicholas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Oxygen is a promising exoplanet biosignature due to the evolutionary advantage conferred by harnessing starlight for photosynthesis, and the apparent low likelihood of maintaining oxygen-rich atmospheres without life. Hypothetical scenarios have been proposed for non-biological oxygen accumulation on planets around late M-dwarfs, where the extended pre-main sequence may favor abiotic O$_2$ accumulation. In contrast, abiotic oxygen accumulation on planets around F, G, and K-type stars is seemingly less likely, provided they possess substantial non-condensable gas inventories. The comparative robustness of oxygen biosignatures around larger stars has motivated plans for next-generation telescopes capable of oxygen detection on planets around sun-like stars. However, the general tendency of terrestrial planets to develop oxygen-rich atmospheres across a broad range of initial conditions and evolutionary scenarios has not been explored. Here, we use a coupled thermal-geochemical-climate model of terrestrial planet evolution to illustrate three scenarios whereby significant abiotic oxygen can accumulate around sun-like stars, even when significant non-condensable gas inventories are present. For Earth-mass planets, we find abiotic oxygen can accumulate to modern levels if (1) the CO$_2$:H$_2$O ratio of the initial volatile inventory is high, (2) the initial water inventory exceeds ~50 Earth oceans, or (3) the initial water inventory is very low. Fortunately, these three abiotic oxygen scenarios could be distinguished from biological oxygen with observations of other atmospheric constituents or characterizing the planetary surface. This highlights the need for broadly capable next-generation telescopes that are equipped to constrain surface water inventories via time-resolved photometry and search for temporal biosignatures or disequilibrium biosignatures to assess whether oxygen is biogenic.
description: Main text 20 pages, 7 figures. Supporting materials 45 pages
A Planetary Mass Companion to the K0 Giant HD 17092
Creators: name: Niedzielski, A.
name: Konacki, M.
name: Wolszczan, A.
name: Nowak, G.
name: Maciejewski, G.
name: Gelino, R. C.
name: Shao, M.
name: Shetrone, M.
name: Ramsey, L. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a substellar-mass companion to the K0-giant HD 17092 with the Hobby-Eberly Telescope. In the absence of any correlation of the observed 360-day periodicity with the standard indicators of stellar activity, the observed radial velocity variations are most plausibly explained in terms of a Keplerian motion of a planetary-mass body around the star. With the estimated stellar mass of 2.3Msun, the minimum mass of the planet is 4.6MJ. The planet's orbit is characterized by a mild eccentricity of e=0.17 and a semi-major axis of 1.3 AU. This is the tenth published detection of a planetary companion around a red giant star. Such discoveries add to our understanding of planet formation around intermediate-mass stars and they provide dynamical information on the evolution of planetary systems around post-main sequence stars.
description: 13 pages, 3 figures, 2 tables. Submitted to ApJ
Online Hackathons as an Engaging Tool to Promote Group Work in Emergency Remote Learning
Creators: name: Gama, Kiev
name: Zimmerle, Carlos
name: Rossi, Pedro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: In 2020, due to the COVID-19 pandemic, educational activities had to be done remotely as a way to avoid the spread of the disease. What happened was not exactly a shift to an online learning model but a transition to a new approach called Emergency Remote Teaching. It is a temporary strategy to keep activities going on until it is safe again to return to the physical facilities of universities. This new setting became a challenge to both teachers and students. The lack of interaction and classroom socialization became obstacles for students to continue engaged. Before the pandemic, hackathons -- short-lived events (1 to 3 days) where participants intensively collaboration to develop software prototypes -- were starting to be explored as an alternative venue to engage students in acquiring and practicing technical skills. In this paper, we present an experience report on the usage of an online hackathon as a resource to engage students in the development of their semester project in a distributed applications course during this emergency remote teaching period. We describe details of the intervention and present an analysis of the students' perspective of the approach. One of the important findings was the efficient usage of the Discord communication tool -- already used by all students while playing games -- which helped them socialize and keep them continuously engaged in synchronous group work, "virtually collocated".
description: 26th Annual ACM Conference on Innovation and Technology in Computer Science Education (ITiCSE) - 2021
Collisionsless amplifying of longitudinal electron waves in two-stream plasma
Creators: name: Soshnikov, V. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: To better understanding the principal features of collisionless damping/growing plasma waves we have implemented a demonstrative calculation for the simplest cases of electron waves in two-stream plasmas with the delta-function type electron velocity distribution function of each of the streams with velocities v(1) and v(2). The traditional dispersion equation is reduced to an algebraic 4th order equation, for which numerical solutions are presented for a variant of equal stream densities. In the case of uniform half-infinite slab one finds two dominant type solutions: non-damping forward waves and forward complex conjugated exponentially both damping and growing waves. Beside it in this case there is no necessity of calculation any logarithmically divergent indefinite integrals. The possibility of wave amplifying might be useful in practical applications.
description: 6 pages, 2 tables,PDF
Finite element analysis of RC beams retrofitted with fibre reinforced polymers
Creators: name: Simonelli, Giuseppe
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: La presente tesi riassume uno studio condotto sull’analisi delle travi in cemento armato rinforzate con materiale composito fibrorinforzato.
Nella prima parte del documento vengono introdotte le tecniche di rinforzo ed i materiali utilizzabili. Segue una trattazione prevalentemente descrittiva delle principali problematiche associate a questo tipo di strutture. Si stabilisce quindi che i punti chiave per una corretta analisi sono: accurata modellazione del comportamento nonlineare del calcestruzzo, modellazione realistica del comportamento all’interfaccia tra i diversi materiali e modellazione discreta della fessurazione del calcestruzzo. I tre punti vengono quindi sviluppati indipendentemente. In particolare per il calcestruzzo viene formulato un modello elastoplatico caratterizzato da funzione di snervamento di Menetrey Willam. Detta funzione di snervamento dipende da tutti e tre’ gli invarianti del tensore delle tensioni ed e’ pertanto difficile da trattare in ambito numerico. Metodi recenti che permettono comunque un efficiente implementazione del modello proposto in un codice agli elementi finiti vengono discussi dettagliatamente. I modelli definiti per tener conto degli aspetti chiave sopra menzionati vengono testati mediante confronto con dati sperimentali disponibili in letteratura. I risultati ottenuti vengono commentati sia con riferimento alle prestazioni e potenzialita’ dei modelli sviluppati, sia con rifrimento agli aspetti del comportamento del sistema strutturale studiato chiariti dai risultati numerici prodotti.
Limits of the Plane Wave Approximation in the Measurement of Molecular Properties
Creators: name: Walters, Zachary B.
name: Tonzani, Stefano
name: Greene, Chris H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Rescattering electrons offer great potential as probes of molecular properties on ultrafast timescales. The most famous example is molecular tomography, in which high harmonic spectra of oriented molecules are mapped to ``tomographic images'' of the relevant molecular orbitals. The accuracy of such reconstructions may be greatly affected by the distortion of scattering wavefunctions from their asymptotic forms due to interactions with the parent ion. We investigate the validity of the commonly used plane wave approximation in molecular tomography, showing how such distortions affect the resulting orbital reconstructions.
Synthesis of new anti-bacterial agents: Hydrazide Schiff bases of vanadium acetylacetonate complexes
Creators: name: Dikio, Charity Wokwu
name: Bamidele Joseph Okoli
name: Fanyana Moses Mtunzi
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Marine Biology

description: Four Schiff bases, L1, L2, L3 and L4 having –ON– donor system have been synthesised by the condensation of 4-(diethylamino)-2-hydroxybenzaldehyde with 4-nitrobenzohydrazide and 4-methoxybenzohydrazide to form L1 and L2. 4-(dimethylamino) benzaldehyde refluxed in the presence of 4-nitrobenzohydrazide and 4-methoxybenzohydrazide forms L3 and L4, respectively. The four Schiff base complexes (SBC 1A–1D) were synthesised by treatment of the Schiff base ligands with vanadium acetylacetonate and characterised using spectroscopic analysis such as FTIR revealing the presence of azomethine μ (C=N) stretching vibrations around 1612–1623 cm−1, 1H and 13C NMR revealing the presence of azomethine peaks to confirm the formation of the Schiff base ligands. The spectral data of the Schiff base complexes reveal the absence of the azomethine stretching vibrational frequencies and the presence of the V–O stretching vibrational frequency at 993 cm−1. Thermal analysis of the ligands and complexes indicates high thermal stability of 280 and 160°C, respectively. Schiff base complexes 1A and 1B exhibited antimicrobial activities against both species tested with MIC of 305.3 and 378.9 mg/mL, these activities were dependent on the position of the hydroxyl and the length of the alkyl groups on the 4-Methoxy-benzoic acid (4-diethylamino-2-hydroxy-benzylidene)-hydrazide moiety of the Schiff bases complex.
A Poisson model for earthquake frequency uncertainties in seismic hazard analysis
Creators: name: Greenhough, J.
name: Main, I. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geophysics (physics.geo-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Frequency-magnitude distributions, and their associated uncertainties, are of key importance in statistical seismology. When fitting these distributions, the assumption of Gaussian residuals is invalid since event numbers are both discrete and of unequal variance. In general, the observed number in any given magnitude range is described by a binomial distribution which, given a large total number of events of all magnitudes, approximates to a Poisson distribution for a sufficiently small probability associated with that range. In this paper, we examine four earthquake catalogues: New Zealand (Institute of Geological and Nuclear Sciences), Southern California (Southern California Earthquake Center), the Preliminary Determination of Epicentres and the Harvard Centroid Moment Tensor (both held by the United States Geological Survey). Using independent Poisson distributions to model the observations, we demonstrate a simple way of estimating the uncertainty on the total number of events occurring in a fixed time period.
description: 9 pages, 3 figures; accepted by GRL after minor additions
A study of the Norrish type II reaction in the solid state : structure-reactivity correlations based on X-ray crystallography
Creators: name: Nalamasu, Omkaram
Publisher: name: University of British Columbia
Year: 2010

description: The Norrish type II reaction of 31 substrates with the general α-cycloalkyl-p-substituted acetophenone structure was investigated in solid and solution media. The difference in photoreactivity between the solid and solution states and the requirements for photochemical hydrogen abstraction have been derived from X-ray crystal structure data obtained for 17 derivatives. The difference in stereoelectronic requirements for hydrogen transfer among Norrish type II, McLafferty and Barton reactions are discussed. Six-atom abstraction geometries other than chair, namely boat and half-chair, and smooth hydrogen abstractions at O•••H distances greater than the previously supposed upper limit of 2.7Å were observed. Abstractions also occurred at abstraction angles that are as unfavorable as 62° for τ (the degree to which the hydrogen in question lies outside the mean plane of the carbonyl group) and 77° for Δ (the C-O•••H angle). The ideal values of τ and Δ are 0° and 90-120°, respectively. The effect of the solid state on photoreactivity was found to range from very small to significant. The photochemistry of α -adamantyl-p-methoxyacetophenone delineates the importance of packing effects in steering the course of a unimolecular reaction in the solid state. The difference in the solid state reactivity between the two crystal modifications of α-adamantyl-p-chloroacetophenone has been found to be a result of conformational factors rather than packing effects. No correlation was evident in comparing the solution state hydrogen abstraction rate constants with the hydrogen abstraction geometries obtained from X-ray crystallography for the cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl derivatives of α-cycloalkyl-p-chloroacetophenone. This was interpreted as indicating a significant contribution to the hydrogen abstraction rate constant in solution from non-minimum energy conformations with better hydrogen abstraction geometries than that of the minimum energy conformations present in the crystal. An absolute asymmetric synthesis with >80% optical yield was achieved by performing photolyses on the chiral crystals of the achiral starting material, α-3-methyl-l-adamantyl-p-chloroacetophenone. Finally, photolyses of α-cyclohexyl and ct-cyclopentylacetophenone as guest:host complexes with Dianin's compound (4-p-hydroxyphenyl-2,2,4-trimethyl-chroman) revealed that the selectivity achieved in this constrained medium is similar to that obtained in the solid state.
Selective transcription and cellular proliferation induced by PDGF require histone deacetylase activity
Creators: name: Catania, Annunziata
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Histone deacetylases (HDACs) are key regulatory enzymes involved in the control of gene expression in any cell type, and their inhibition by specific drugs has been widely correlated to cell cycle arrest, terminal differentiation and apoptosis. Although some of these compounds gave already very promising results in Phase I and II clinical trials for a large array of tumors, the molecular targets responsible for their anti-tumoral activity are still largely unknown. Here, we investigated whether HDAC activity was required for PDGF-dependent signal transduction and cellular proliferation. Exposure of PDGF-stimulated NIH3T3 fibroblasts to the HDAC inhibitor trichostatin A (TSA) potently repressed the expression of a group of genes strongly correlated to PDGF-dependent cellular growth and pro-survival activity, namely c-myc, VEGF and bcl-XL. Moreover, we show that TSA interfered with STAT3-dependent transcriptional activity induced by PDGF, suggesting STAT proteins as mediators of HDAC activity on PDGF transcriptional responses. Still, neither phosphorylation nor nuclear translocation and DNA-binding of STAT3 were affected by using TSA to interfere with PDGF stimulation. Finally, TSA treatment resulted in the suppression of PDGF-dependent cell proliferation as scored by a bromodeoxyuridine (BrdU) incorporation assay. Our data indicate that inhibition of HDAC activity by specific pharmacological inhibitors antagonizes the mitogenic effect of PDGF, suggesting that these drugs may specifically act on the expression of growth-related, STAT-dependent, PDGF early- and late-responsive genes.
Junis Huntting
Creators: name: C. D. Fredericks & Co.
Publisher: name: Unknown
Year: 1870
Subjects: East Hampton
Photographs
Cabinet photographs
Portrait photographs
Portraits
Men
Young adults

description: This image shows a portrait of Junis Huntting. This photograph is part of a collection of photographs found in the ceiling of 140A Main Street, now 138, in East Hampton in 1970. This collection was donated by Joan Osborne in April 1995.
Spectroscopy of moderately high-redshift RCS-1 clusters
Creators: name: Gilbank, David G.
name: Yee, H. K. C.
name: Ellingson, E.
name: Gladders, M. D.
name: Barrientos, L. F.
name: Blindert, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present spectroscopic observations of 11 moderately high-redshift (z~0.7- 1.0) clusters from the first Red-Sequence Cluster Survey (RCS-1). We find excellent agreement between the red-sequence estimated redshift and the spectroscopic redshift, with a scatter of 10% at z>0.7. At the high-redshift end (z>~0.9) of the sample, we find two of the systems selected are projections of pairs of comparably rich systems, with red-sequences too close to discriminate in (R-z') colour. In one of these systems, the two components are close enough to be physically associated. For a subsample of clusters with sufficient spectroscopic members, we examine the correlation between B_gcR (optical richness) and the dynamical mass inferred from the velocity dispersion. We find these measurements to be compatible, within the relatively large uncertainties, with the correlation established at lower redshift for the X-ray selected CNOC1 clusters and also for a lower redshift sample of RCS-1 clusters. Confirmation of this and calibration of the scatter in the relation will require larger samples of clusters at these and higher redshifts. [abridged]
description: AJ accepted. 30 pages, 7 figures (figure 5 reduced quality)
Temporal changes of near-surface air temperature in Poland for 1781-2016 and in Tbilisi (Georgia) for 1881-2016
Creators: name: Modzelewska, R.
name: Alania, M. V.
name: Kapanadze, N. I.
name: Khelaia, E. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Analyses of near-surface air temperature T in Poland for 1781-2016 and in Tbilisi (Georgia) for 1881-2016 have been carried out. We show that the centenary warming effect in Poland and in Tbilisi has almost the same peculiarities. An average centenary warming effect deltaT = (1.08+/-0.29) C is observed in Poland and in Tbilisi for 1881-2016. A warming effect is larger in winter season (deltaT = ~1.15 C) than in other seasons (average warming effect for these seasons deltaT = ~0.95 C). We show that a centenary warming is mainly related to the change of solar activity (estimated by sunspot numbers (SSN) and total solar irradiance (TSI)); particularly, a time interval about ~70 years (1890-1960), when a correlation coefficients between 11 years smoothed SSN and T, and TSI and T are high, r = 0.66+/-0.07 and r = 0.73+/-0.07 for Poland and r = 0.82+/-0.05 and r = 0.90+/-0.05 for Tbilisi, respectively; in this period solar activity contributes decisively in the global warming. We show that a global warming effect equals zero based on the temperature T data in Poland for period 1781-1880, when human activities were relatively less than in 1881-2016. We recognize a few feeble ~20+/-3 years disturbances in the temperature changes for period 1885-1980, most likely related with the fluctuations of solar magnetic cycles. We distinguish the fluctuations of ~7-8 years in Poland's T data, possibly connected with local effects of the North Atlantic Oscillation.
description: 12 pages, 6 figures
Collagen-immobilized polyimide membranes for retinal pigment epithelial cell adherence and proliferation
Creators: name: Shokoufeh Teymouri
name: Calejo, Maria Teresa
name: Hiltunen, Maiju
name: Sorkio, Anni
name: Juuti-Uusitalo, Kati
name: Skottman, Heli
name: Kellomäki, Minna
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Physiology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Degenerative retinal diseases are a leading cause of visual loss and irreversible blindness, particularly in the developed world. Retinal pigment cell (RPE) transplantation is nowadays considered the most promising therapeutic approach for certain retinal diseases, and the presence of a supportive scaffold has been considered essential to ensure the success of the implant. In this work, collagen IV was covalently immobilized to the surface of polyimide membranes, with the purpose of developing scaffold materials for RPE cell culture. The covalent modification method involved four steps: argon-plasma treatment, acrylic acid graft polymerization, surface activation, and finally immobilization of collagen type IV. Collagen-modified membranes did not become more rough but became significantly more hydrophilic than the unmodified and dip-coated controls. ARPE-19 cell morphology and attachment were studied by immunofluorescence staining and confocal microscopy. Covalently modified surfaces showed cell attachment and cell properties comparable to the uncoated and dip-coated controls. This work demonstrated the potential of collagen IV-immobilized polyimide membranes as substrates for the growth of ARPE-19 cells.
Measurement of single electron emission in two-phase xenon
Creators: name: Edwards, B.
name: Araujo, H. M.
name: Chepel, V.
name: Cline, D.
name: Durkin, T.
name: Gao, J.
name: Ghag, C.
name: Korolkova, E. V.
name: Lebedenko, V. N.
name: Lindote, A.
name: Lopes, M. I.
name: Luscher, R.
name: Murphy, A. St. J.
name: Neves, F.
name: Ooi, W.
name: da Cunha, J. Pinto
name: Preece, R. M.
name: Salinas, G.
name: Silva, C.
name: Solovov, V. N.
name: Smith, N. J. T.
name: Smith, P. F.
name: Sumner, T. J.
name: Thorne, C.
name: Walker, R. J.
name: Wang, H.
name: White, J. T.
name: Wolfs, F. L. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present the first measurements of the electroluminescence response to the emission of single electrons in a two-phase noble gas detector. Single ionization electrons generated in liquid xenon are detected in a thin gas layer during the 31-day background run of the ZEPLIN-II experiment, a two-phase xenon detector for WIMP dark matter searches. Both the pressure dependence and magnitude of the single-electron response are in agreement with previous measurements of electroluminescence yield in xenon. We discuss different photoionization processes as possible cause for the sample of single electrons studied in this work. This observation may have implications for the design and operation of future large-scale two-phase systems.
description: 11 pages, 6 figures
Synthesis, characterization and biological activity studies of certain 1-((benzo[d]thiazol-2-yl) methyl)-4,5-dihydro-3-methyl-N-phenyl-1H-pyrazol-5-imine and 2-((5-aryl-1H-1,2,4-triazol-3-yl) methyl)benzo[d]thiazoles
Creators: name: Pathki Uma
name: Kamatala Chinna Rajanna
name: Firasath Unnisa
name: Pondichery Kuppuswamy Saiprakash
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biophysics
subject: Biochemistry
subject: Neuroscience
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Plant Biology
subject: FOS: Biological sciences

description: In this work, 1-((benzo[d]thiazol-2-yl)methyl)-4,5-dihydro-3-methyl-N-phenyl-1H-pyrazol-5-imine (3a-h) have been successfully synthesized from the condensation of 2-((Benzo[d]thiazol-2-1-((benzo[d]thiazol-2-yl)methyl)-3-methyl-1H-pyrazol-5(4H)-one (2) with different aromatic amines. On the other hand, in another protocol, cyclization of 2-(benzo[d]thiazol-2-yl) acetohydrazide (4) with different aromatic aldehydes afforded 2-((5-aryl-1H-1,2,4-triazol-3-yl)methyl)benzo[d]thiazoles (5a-h). A perusal of the biological activity studies revealed that the derivatives having chlorine as substituent are more toxic to all six bacteria. Among the chloro group compounds, the compound which has methoxy group is more toxic.
Synthesis of new anti-bacterial agents; hydrazide schiff bases of vanadium acetylacetonate complexes
Creators: name: Dikio, Charity Wokwu
name: Bamidele Joseph Okoli
name: Fanyana Moses Mtunzi
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Marine Biology
subject: Plant Biology

description: Four Schiff bases, LI, L2, L3 and L4 having — ON — donor system have been synthesised by the condensation of 4-(diethylamino)-2-hydroxybenzaldehyde with 4-nitrobenzohydrazide and 4-methoxybenzohydrazide to form L1 and L2. 4-(dimethylamino) benzaldehyde refluxed in the presence of 4- nitrobenzohydrazide and 4-methoxybenzohydrazide forms L3 and L4 respectively. The four Schiff base complexes (SBC 1A to 1D) were synthesised by treatment of the Schiff base ligands with Vanadium acetylacetonate and characterised using spectroscopic analysis such as FT-IR revealing the presence of azomethine μ (C=N) stretching vibrations around 1612 – 1623 cm−1, 1H and 13C NMR revealing the presence of azomethine peaks to confirm the formation of the Schiff base ligands. The spectral data of the Schiff base complexes reveal the absence of the azomethine stretching vibrational frequencies and the presence of the V-O stretching vibrational frequency at 993 cm−1. Thermal analysis of the ligands and complexes indicates high thermal stability of 280 °C and 160 °C respectively. Schiff base complexes 1A and 1B exhibited antimicrobial activities against both species tested with MIC of 305.3 mg/mL and 378.9 mg/mL, these activities were dependent on the position of the hydroxyl and the length of the alkyl groups on the 4-Methoxy-benzoic acid (4-diethylamino-2-hydroxy-benzylidene)-hydrazide moiety of the Schiff bases complex.
Quantum Hall States at $ν=\frac{2}{k+2}$
Creators: name: Bishara, Waheb
name: Fiete, Gregory A.
name: Nayak, Chetan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the $ν=\frac{2}{k+2}$ quantum Hall states which are particle-hole conjugates of the $ν=\frac{k}{k+2}$ Read-Rezayi states. We find that equilibration between the different modes at the edge of such a state leads to an emergent SU(2)$_k$ algebra in the counter-propagating neutral sector. Heat flow along the edges of these states will be in the opposite direction of charge flow. In the $k=3$ case, which may be relevant to $ν=2+{2/5}$, the thermal Hall conductance and the exponents associated with quasiparticle and electron tunneling distinguish this state from competing states such as the hierarchy/Jain state.
description: 4 pages
P2O5 supported on SiO2 as an efficient and reusable catalyst for rapid one-pot synthesis of carbamatoalkyl naphthols under solvent-free conditions
Creators: name: Atefeh Ghasemi
name: Abolghasem Davoodnia
name: Pordel, Mehdi
name: Tavakoli-Hoseini, Niloofar
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Neuroscience
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Under mild conditions and without any additional organic solvent, synthesis of carbamatoalkyl naphthols by the one-pot three-component reaction of β-naphthol with a wide range of aromatic aldehydes and methyl carbamate could be carried out in the presence of P2O5 supported on SiO2 (P2O5/SiO2). The results showed that the catalyst has high activity and the desired products were obtained in high yields in short reaction times. Other beneficial features of this protocol include inexpensive and easily obtained catalyst, simple work-up, and the recyclability and reusability of the catalyst for up to five consecutive runs.
Wavefront correction with a ferrofluid deformable mirror: experimental results and recent developments
Creators: name: Brousseau, Denis
name: Borra, Ermanno F.
name: Thibaul, Simon
name: Ritcey, Anna M.
name: Parent, Jocelyn
name: Seddiki, Omar
name: Dery, Jean-Philippe
name: Faucher, Luc
name: Vassallo, Julien
name: Naderian, Azadeh
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present the research status of a deformable mirror made of a magnetic liquid whose surface is actuated by a triangular array of small current carrying coils. We demonstrate that the mirror can correct a 11 microns low order aberrated wavefront to a residual RMS wavefront error 0.05 microns. Recent developments show that these deformable mirrors can reach a frequency response of several hundred hertz. A new method for linearizing the response of these mirrors is also presented.
description: To appear in "Ground-based and Airborne Instrumentation for Astronomy II" SPIE conference, Marseille, 23-28 June 2008
Effect of electronegativity on structural, spectrophotometric and thermo-chemical properties of fluorine and chlorine substituted isoxazoles by DFT method
Creators: name: Nilesh U. Jadhao
name: Naik, Anil B.
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Inorganic Chemistry

description: The effect of electronegativity (F and Cl atom) on structural, spectrophotometric, thermo-chemical properties, and solvent effect on electronic absorption spectra of {3-(3,5-dichloro-2-hydroxyphenyl)-5-[(4-fluorophenyl)amino] isoxazol-4-yl}(phenyl)methanone (Ia) and {3-(3,5-dichloro-2-hydroxyphenyl)-5-[(4-chlorophenyl)amino] isoxazol-4-yl}(phenyl) methanone (Ib) were studied by DFT method using PBE1PBE functional with 6-311++g (d, p) basis set. The results show that the electronegativity of halogen group affect the bond length, atomic charges, excited wavelength, molecular orbital energy gap, vibration frequency, thermo-chemical parameters, and stability of compounds.
Signalling boosts the evolution of cooperation in repeated group interactions
Creators: name: Martinez-Vaquero, Luis A.
name: Santos, Francisco C.
name: Trianni, Vito
Publisher: name: arXiv
Year: 2021
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Computer Science and Game Theory (cs.GT)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Many biological and social systems show significant levels of collective action. Several cooperation mechanisms have been proposed, yet they have been mostly studied independently. Among these, direct reciprocity supports cooperation on the basis of repeated interactions among individuals. Signals and quorum dynamics may also drive cooperation. Here, we resort to an evolutionary game theoretical model to jointly analyse these two mechanisms and study the conditions in which evolution selects for direct reciprocity, signalling, or their combination. We show that signalling alone leads to higher levels of cooperation than when combined with reciprocity, while offering additional robustness against errors. Specifically, successful strategies in the realm of direct reciprocity are often not selected in the presence of signalling, and memory of past interactions is only exploited opportunistically in case of earlier coordination failure. Differently, signalling always evolves, even when costly. In the light of these results, it may be easier to understand why direct reciprocity has been observed only in a limited number of cases among non-humans, whereas signalling is widespread at all levels of complexity.
Efficient nonlinear witnessing of non-absolutely separable states with lossy detectors
Creators: name: Patra, Ayan
name: Mal, Shiladitya
name: De, Aditi Sen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entangled states are undoubtedly an integral part of various quantum information processing tasks. On the other hand, absolutely separable states which cannot be made entangled under any global unitary operations are useless from the resource theoretic perspective, and hence identifying non-absolutely separable states can be an important issue for designing quantum technologies. Here we report that nonlinear witness operators provide significant improvements in detecting non-absolutely separable states over their linear analogs, by invoking examples of states in various dimensions. We also address the problem of closing detection loophole and find critical efficiency of detectors above which no fake detection of non-absolutely separable (non-absolutely positive partial transposed) states is possible.
description: 9 pages, 6 figures
Fragmentation functions for pions, kaons, protons and charged hadrons
Creators: name: de Florian, Daniel
name: Sassot, Rodolfo
name: Stratmann, Marco
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present new sets of pion, kaon, proton and inclusive charged hadron fragmentation functions obtained in NLO combined analyses of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and deep-inelastic lepton-proton scattering with either particles identified in the final state. At variance with all previous fits, the present analyses take into account data where hadrons of different electrical charge are identified, which allow to discriminate quark from anti-quark fragmentation functions.
description: 3 pages, 7 figures. Talk given at EPS HEP 2007
Another application of newly prepared Brønsted-acidic ionic liquids as highly efficient reusable catalysts for neat synthesis of amidoalkyl naphthols
Creators: name: Dehghan, Maryam
name: Abolghasem Davoodnia
name: Bozorgmehr, Mohammad R.
name: Tavakoli-Hoseini, Niloofar
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: In this work, two newly prepared Brønsted-acidic ionic liquids, [MPyrrSO3H]Cl (IL1) and [MMorSO3H]Cl (IL2), were efficiently used as catalysts for the synthesis of amidoalkyl naphthols through the one‐pot, three‐component reaction of β‐naphthol, aryl aldehydes, and acetamide under neat conditions. High activity of the catalysts, excellent yields, short reaction times, simple procedure with an easy work-up, and the absence of any volatile and hazardous organic solvents are some advantages of the present methodology. Moreover, the catalysts are simply prepared and can be recovered conveniently and reused such that considerable catalytic activity can still be achieved after the fifth run.
Quantum Fisher Information Bounds on Precision Limits of Circular Dichroism
Creators: name: Wang, Jiaxuan
name: Agarwal, Girish S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Circular dichroism (CD) is a widely used technique for investigating optically chiral molecules, especially for biomolecules. It is thus of great importance that these parameters be estimated precisely so that the molecules with desired functionalities can be designed. In order to surpass the limits of classical measurements, we need to probe the system with quantum light. We develop quantum Fisher information matrix (QFIM) for precision estimates of the circular dichroism and the optical rotary dispersion for a variety of input quantum states of light. The Cramer-Rao bounds, for all four chirality parameters are obtained, from QFIM for (a) single photon input states with a specific linear polarization and for (b) NOON states having two photons with both either left polarized or right polarized. The QFIM bounds, using quantum light, are compared with bounds obtained for classical light beams i.e., beams in coherent states. Quite generally, both the single photon state and the NOON state exhibit superior precision in the estimation of absorption and phase shift in relation to a coherent source of comparable intensity, especially in the weak absorption regime. In particular, the NOON state naturally offers the best precision among the three. We compare QFIM bounds with the error sensitivity bounds, as the latter are relatively easier to measure whereas the QFIM bounds require full state tomography. We also outline an empirical scheme for estimating the measurement sensitivities by projective measurements with single-photon detectors.