cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Photometry Using Kepler "Superstamps" of Open Clusters NGC 6791 & NGC 6819
Creators: name: Kuehn, Charles A.
name: Drury, Jason
name: Stello, Dennis
name: Bedding, Timothy R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Kepler space telescope has proven to be a gold mine for the study of variable stars. Unfortunately, Kepler only returns a handful of pixels surrounding each star on the target list, which omits a large number of stars in the Kepler field. For the open clusters NGC 6791 and NGC 6819, Kepler also reads out larger superstamps which contain complete images of the central region of each cluster. These cluster images can potentially be used to study additional stars in the open clusters. We present preliminary results from using traditional photometric techniques to identify and analyze additional variable stars from these images.
description: 2 pages, 2 figures, to appear in the conference proceedings of IAU Symp. 301 Wroclaw, Poland, 2013 August 19-23, Precision Asteroseismology, Celebration of the Scientific Opus of Wojtek Dziembowski
Investigating the Effect of Noise on the Training Performance of Hybrid Quantum Neural Networks
Creators: name: Kashif, Muhammad
name: Sychiuco, Emman
name: Shafique, Muhammad
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we conduct a comprehensively analyze the influence of different quantum noise gates, including Phase Flip, Bit Flip, Phase Damping, Amplitude Damping, and the Depolarizing Channel, on the performance of HyQNNs. Our results reveal distinct and significant effects on HyQNNs training and validation accuracies across different probabilities of noise. For instance, the Phase Flip gate introduces phase errors, and we observe that HyQNNs exhibit resilience at higher probability (p = 1.0), adapting effectively to consistent noise patterns, whereas at intermediate probabilities, the performance declines. Bit Flip errors, represented by the PauliX gate, impact HyQNNs in a similar way to that Phase Flip error gate. The HyQNNs, can adapt such kind of errors at maximum probability (p = 1.0). Unlike Phase and Bit Flip error gates, Phase Damping and Amplitude Damping gates disrupt quantum information, with HyQNNs demonstrating resilience at lower probabilities but facing challenges at higher probabilities. Amplitude Damping error gate, in particular, poses efficiency and accuracy issues at higher probabilities however with lowest probability (p = 0.1),it has the least effect and the HyQNNs, however not very effectively, but still tends to learn. The Depolarizing Channel proves most detrimental to HyQNNs performance, with limited or no training improvements. There was no training potential observed regardless of the probability of this noise gate. These findings underscore the critical need for advanced quantum error mitigation and resilience strategies in the design and training of HyQNNs, especially in environments prone to depolarizing noise. This paper quantitatively investigate that understanding the impact of quantum noise gates is essential for harnessing the full potential of quantum computing in practical applications.
Graded von Neumann regularity of rings graded by semigroups
Creators: name: Lännström, Daniel
name: Öinert, Johan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16W50, 16E50

description: In this article, we give a complete characterization of semigroup graded rings which are graded von Neumann regular. We also demonstrate our results by applying them to several classes of examples, including matrix rings and groupoid graded rings.
description: 9 pages. Minor corrections from v1
Conduction of spin currents through insulating oxides
Creators: name: Hahn, Christian
name: De Loubens, Grégoire
name: Naletov, V. V.
name: Youssef, J. Ben
name: Klein, Olivier
name: Viret, Michel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Spintronics is a field of electronics based on using the electron spin instead of its charge. The recent advance in the manipulation of pure spin currents, i.e. angular momentum transfer not associated to conventional charge currents, has opened new opportunities to build spin based devices with low energy consumption. It has also allowed to integrate ferromagnetic insulators in spintronic devices, either as spin sources or spin conductors using their magnetic excitations to propagate a spin signal. Antiferromagnetic insulators belong to another class of materials that can also sustain magnetic excitations, even with a higher group velocity. Hence, they have potential as angular momentum conductors, possibly making faster spin devices. At the opposite end, angular momentum insulators are also required in spintronic circuits. The present letter underlines some essential features relevant for spin current conduction, based on measurements of angular momentum transmission in antiferromagnetic NiO and in the non-magnetic light element insulator SiO$_2$.
On the role of spectral properties of viscous flux discretization for flow simulations on marginally resolved grids
Creators: name: Chamarthi, Amareshwara Sainadh
name: K, Hemanth Chandra Vamsi
name: Hoffmann, Natan
name: Bokor, Sean
name: Frankel, Steven H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In this note, the importance of spectral properties of viscous flux discretization in solving compressible Navier-Stokes equations for turbulent flow simulations is discussed. We studied six different methods, divided into two different classes, with poor and better representation of spectral properties at high wavenumbers. Both theoretical and numerical results have revealed that the method with better properties at high wavenumbers, denoted as $α$-damping type discretization, produced superior solutions compared to the other class of methods. The proposed compact $α$-damping method converged towards the direct numerical simulation (DNS) solution at lower grid resolution compared with the other class of methods and is, therefore, a better candidate for high fidelity large-eddy simulations (LES) and DNS studies.
description: 14
Constraining CP violating nucleon-nucleon long range interactions in diatomic eEDM searches
Creators: name: Baruch, Chaja
name: Changala, P. Bryan
name: Shagam, Yuval
name: Soreq, Yotam
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The searches for CP violating effects in diatomic molecules, such as $\text{HfF}^+$ and ThO, are typically interpreted as a probe of the electron's electric dipole moment ($e\text{EDM}$), a new electron-nucleon interaction, and a new electron-electron interaction. However, in the case of a nonvanishing nuclear spin, a new CP violating nucleon-nucleon long range force will also affect the measurement. Here, we use the $\text{HfF}^+$ $e\text{EDM}$ search and derive a new bound on this hypothetical interaction, which is the most stringent from terrestrial experiments in the 1 eV-10 keV mass range. These multiple new physics sources motivate independent searches in different molecular species for CP violation at low energy that result in model independent bounds, which are insensitive to cancellation among them.
description: 9 pages, 4 figures; v2: updated bound, added citation, conclusions unchanged, matched to published version
Causes and Implications of Extreme Atmospheric Moisture Demand during the Record-Breaking 2011 Wildfire Season in the Southwestern United States
Creators: name: Williams, A. Park
name: Seager, Richard
name: Berkelhammer, Max
name: Macalady, Alison K.
name: Crimmins, Michael A.
name: Swetnam, Thomas W.
name: Trugman, Anna T.
name: Buenning, Nikolaus
name: Hryniw, Natalia
name: McDowell, Nate G.
name: Noone, David
name: Mora, Claudia I.
name: Rahn, Thom
Publisher: name: Columbia University
Year: 2014
Subjects: Droughts
Climatic changes
Water vapor, Atmospheric
Atmospheric temperature
Wildfires
Atmosphere

description: In 2011, exceptionally low atmospheric moisture content combined with moderately high temperatures to produce a record-high vapor pressure deficit (VPD) in the southwestern United States (SW). These conditions combined with record-low cold-season precipitation to cause widespread drought and extreme wildfires. Although interannual VPD variability is generally dominated by temperature, high VPD in 2011 was also driven by a lack of atmospheric moisture. The May–July 2011 dewpoint in the SW was 4.5 standard deviations below the long-term mean. Lack of atmospheric moisture was promoted by already very dry soils and amplified by a strong ocean-to-continent sea level pressure gradient and upper-level convergence that drove dry northerly winds and subsidence upwind of and over the SW. Subsidence drove divergence of rapid and dry surface winds over the SW, suppressing southerly moisture imports and removing moisture from already dry soils. Model projections developed for the fifth phase of the Coupled Model Intercomparison Project (CMIP5) suggest that by the 2050s warming trends will cause mean warm-season VPD to be comparable to the record-high VPD observed in 2011. CMIP5 projections also suggest increased interannual variability of VPD, independent of trends in background mean levels, as a result of increased variability of dewpoint, temperature, vapor pressure, and saturation vapor pressure. Increased variability in VPD translates to increased probability of 2011-type VPD anomalies, which would be superimposed on ever-greater background VPD levels. Although temperature will continue to be the primary driver of interannual VPD variability, 2011 served as an important reminder that atmospheric moisture content can also drive impactful VPD anomalies.
Seasonal variations in the Amazon plume-related atmospheric carbon sink
Creators: name: Cooley, S. R.
name: Coles, V. J.
name: Subramaniam, Ajit
name: Yager, P. L.
Publisher: name: Columbia University
Year: 2007
Subjects: subject: Carbon dioxide sinks
subject: Oceanography
subject: FOS: Earth and related environmental sciences
subject: Biogeochemistry

description: The Amazon River plume is a highly seasonal feature that can reach more than 3000 km across the tropical Atlantic Ocean, and cover ∼2 million km². Ship observations show that its seasonal presence significantly reduces sea surface salinity and inorganic carbon. In the western tropical North Atlantic during April–May 2003, plume-influenced stations exhibited surface DIC concentrations lowered by as much as 563 μmol C kg⁻¹ (∼28%) and pCO₂ as low as 201 μatm. We combine our data with other data sets to understand the annual uptake and seasonal variability of the plume-related CO₂ sink. Using flux estimates from all seasons with monthly plume areas determined by satellite, we calculate the annual carbon uptake by the outer plume alone (28 < S < 35) to be 15 ± 6 TgC yr⁻¹. Diazotroph-supported net community production enhanced the air-sea CO₂ disequilibrium by 100x and reversed the typical CO₂ outgassing from the tropical North Atlantic. The carbon sink in the Amazon plume depends on climate-sensitive conditions that control river hydrology, CO₂ solubility, and gas exchange.
title: The Effect of Posttraumatic Stress and Trauma-Focused Disclosure on Experimental Pain Sensitivity Among Trauma-Exposed Women
Creators: name: Hood, Caitlyn O.
Publisher: name: University of Kentucky Libraries
Year: 2019

description: Previous studies evaluating the impact of trauma history and PTSD on pain sensitivity yield inconsistent findings; the presence of trauma-related negative affective states may account for these discrepancies. Therefore, the proposed study aimed to evaluate the effect of trauma-related negative affect and PTSD symptoms on sensory and affective components of pain sensitivity among trauma-exposed women. Adult women (N = 87) with low and high PTSD symptoms underwent an emotional disclosure paradigm, during which they wrote about a traumatic event or a neutral topic. Participants then completed a pain induction procedure. Compared to women with low PTSD symptoms, women with high PTSD symptoms demonstrated increased time to pain detection (e.g., threshold) and ability to withstand pain (e.g., tolerance), as well as increased pain intensity and when accounting for relevant covariates. Women with high PTSD symptoms who wrote about their worst traumatic experience reported higher pain unpleasantness relative to women with high PTSD symptoms who wrote about the neutral topic and women with low PTSD symptoms who wrote about either topic. Results suggest that PTSD symptoms and trauma-related negative affect may facilitate alterations in pain sensitivity in trauma-exposed women, but this relationship is complex and requires further exploration.
description: Copyright © Caitlyn Olivia Hood 2019
description: Funding information: Professional Student Mentored Research Fellowship (PSMRF), Center for Clinical and Translational Science, University of Kentucky, Graduate Research Grant, Psi Chi International Honor Society in Psychology
Extensive bloom of a N₂-fixing diatom/cyanobacterial association in the tropical Atlantic Ocean
Creators: name: Carpenter, Edward J.
name: Montoya, Joseph P.
name: Burns, James
name: Mulholland, Margaret R.
name: Subramaniam, Ajit
name: Capone, Douglas G.
Publisher: name: Columbia University
Year: 1999
Subjects: Cyanobacterial blooms
Nitrogen--Fixation
Marine ecology
Biogeochemistry
Chemical oceanography

description: We encountered an extensive bloom of the colonial diatom Hemiaulus hauckii along a 2500 km cruise track off the NE coast of South America in autumn 1996. Each diatom cell contained the heterocystous. N₂-fixing cyanobacterial endosymbiont Richeiia intracellularis. Surface Richeiia heterocyst (and filament) densities increased from 10⁶ heterocyst 1⁻¹ in the bloom. Total abundance ranged from 10⁶ eterocyst m⁻² outside the bloom to over 10¹⁰ heterocyst m⁻² within the bloom. Rates of primary production averaged 1.2 g C m⁻² d⁻¹, higher than typical for oligotrophic Open ocean waters. N₂ fixation during the bloom by the Richelia/Hemiaulus association added an average of 45 mg N m⁻² d⁻¹ to the water column. The relative importance of NH₄⁺ uptake over the Course of the bloom increased from 0 to 42% of total N uptake by the Hemiauluslficheiia association. N₂ fixation by Richelia exceeded estimates of 'new' N flux via NO₃ diffusion from deep water and, together with additional N, fixation by the cyanobacterium Trichodesmium, could supply about 25% of the total N demand through the water column during the bloom. Suspended particles and zooplankton collected within the bloom were depleted in ¹⁵N, reflecting the dominant contribution of N₂ fixation to the planktonic N budget. The bloom was spatially extensive, as revealed by satellite imagery, and is calculated to have contributed about 0.5 Tg N to the euphotic zone. Such blooms may represent an important and previously unrecognized source of new N to support primary production in nutrient-poor tropical waters. Furthermore, this bloom demonstrates that heterocystous cyanobacteria can also make quantitatively important contributions of N in oceanic water column environments.
Causes and impacts of the 2005 Amazon drought
Creators: name: Zeng, Ning
name: Yoon, Jin-Ho
name: Marengo, Jose A.
name: Subramaniam, Ajit
name: Nobre, Carlos A.
name: Mariotti, Annarita
name: Neelin, J. David
Publisher: name: Columbia University
Year: 2008
Subjects: subject: Droughts
subject: Oceanography
subject: FOS: Earth and related environmental sciences
subject: Hydrology

description: A rare drought in the Amazon culminated in 2005, leading to near record-low streamflows, small Amazon river plume, and greatly enhanced fire frequency. This episode was caused by the combination of 2002–03 El Niño and a dry spell in 2005 attributable to a warm subtropical North Atlantic Ocean. Analysis for 1979–2005 reveals that the Atlantic influence is comparable to the better-known Pacific linkage. While the Pacific influence is typically locked to the wet season, the 2005 Atlantic impact concentrated in the Amazon dry season when its hydroecosystem is most vulnerable. Such mechanisms may have wide-ranging implications for the future of the Amazon rainforest.
The stationary distribution of a Markov jump process glued together from two state spaces at two vertices
Creators: name: Mélykúti, Bence
name: Pfaffelhuber, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J27 (Primary), 60K15 (Secondary)

description: We compute the stationary distribution of a continuous-time Markov chain which is constructed by gluing together two finite, irreducible Markov chains by identifying a pair of states of one chain with a pair of states of the other and keeping all transition rates from either chain (the rates between the two shared states are summed). The result expresses the stationary distribution of the glued chain in terms of quantities of the two original chains. Some of the required terms are nonstandard but can be computed by solving systems of linear equations using the transition rate matrices of the two original chains. Special emphasis is given to the cases when the stationary distribution of the glued chain is a multiple of the equilibria of the original chains, and when not, for which bounds are derived.
description: 28 pages. Proposition 4, Theorem 7 and their proofs have been changed to correct errors. The notation has been modified. This is a revision of our Author's Original Manuscript submitted for publication to Stochastic Models, Taylor & Francis LLC
“I Will Never Leave a Fallen Comrade”: The Cook County Veterans Treatment Court and its contribution to military service member rehabilitation and reintegration
Creators: name: Collins, McAllister Brent
Publisher: name: University of Chicago
Year: 2023
Subjects: subject: veterans treatment court
subject: alternative courts
subject: problem-solving courts
subject: justice-involved military veterans
subject: military veterans
subject: service members
subject: Cook County, IL

description: The most recent data presented by the Bureau of Justice Statistics in 2021 estimated that 8% of all inmates incarcerated in federal or state prisons in 2016 were former service members, a number comprising 107,400 veterans. To aid these military veterans whose crimes may be directly linked to conditions developed while fulfilling their service obligations, veterans treatment courts were established. The intent of these entities was to redirect individuals away from traditional court and potential incarceration/recidivism through social services and mental health resources. This research study examined the effectiveness of veterans treatment court programs in an attempt to gain a better understanding of former military service members’ needs and experiences as they reintegrate into civilian communities. While there exists a variety of alternative courts constructed to provide various government, non-profit, and private remedies to various demographics (e.g. non-violent offenders, minority groups, single mothers, seniors), this research study centers around a somewhat recently instituted body, the Veterans Treatment Court Program of Cook County, IL. A thorough evaluation was conducted by examining existing programs combined with a series of semi-structured interviews concerning the services offered by the Cook County Veterans Treatment Court, the entity charged with aiding justice-involved military veterans in the Chicago, IL, metropolitan area. Research questions for this work included the following: What are some of the common challenges and successes experienced by veterans transitioning out of the VTC? What types of services are most used and needed in supporting veterans transitioning out of the VTC? Why do VTC veterans opt to participate in the program? As such, suggestions for the implementation of supplemental services for overall program improvement are provided as well as highlighting existing offerings that are redundant, under-utilized, or otherwise in need of restructuring or elimination. Keywords: veterans treatment court, alternative courts, problem-solving courts, justice-involved military veterans, military veterans, service members, Cook County, IL
Femtosecond study of the effects of ions on the reorientation dynamics of water
Creators: name: van der Post, Sietse T.
name: Scheidelaar, Stefan
name: Bakker, Huib J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We study the effects of ions on the reorientation dynamics of liquid water with polarization-resolved femtosecond mid-infared spectroscopy. We probe the anisotropy of the excitation of the O-D stretch vibration of HDO molecules in solutions of NaCl, NaI and tetra-alkylammonium bromide salts in 8 percent HDO:H2O. We find that the reorientation O-D groups of HDO molecules hydrating the Cl- and I- anions occurs on two different time scales with time constants of 2pm0.3 ps and 9pm2 ps. The fast component is due to a wobbling motion of the O-D group that keeps the hydrogen bond with the halogenic anion intact. For solutions of tetra-alkylammonium bromide salts we observe a very strong slowing down of the reorientation of water that is associated with the hydration of the hydrophobic alkyl groups of the tetra-alkylammonium ions.
Lattice realization of complex CFTs: Two-dimensional Potts model with $Q>4$ states
Creators: name: Jacobsen, Jesper Lykke
name: Wiese, Kay Joerg
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The two-dimensional $Q$-state Potts model with real couplings has a first-order transition for $Q>4$. We study a loop-model realization in which $Q$ is a continuous parameter. This model allows for the collision of a critical and a tricritical fixed point at $Q=4$, which then emerge as complex conformally invariant theories at $Q>4$, or even complex $Q$, for suitable complex coupling constants. All critical exponents can be obtained as analytic continuation of known exact results for $Q \le 4$. We verify this scenario in detail for $Q=5$ using transfer-matrix computations.
description: 5 pages, 6 figures
Quasimolecular electronic structure of the spin-liquid candidate Ba$_3$InIr$_2$O$_9$
Creators: name: Revelli, A.
name: Sala, M. Moretti
name: Monaco, G.
name: Magnaterra, M.
name: Attig, J.
name: Peterlini, L.
name: Dey, T.
name: Tsirlin, A. A.
name: Gegenwart, P.
name: Fröhlich, T.
name: Braden, M.
name: Grams, C.
name: Hemberger, J.
name: Becker, P.
name: van Loosdrecht, P. H. M.
name: Khomskii, D. I.
name: Brink, J. van den
name: Hermanns, M.
name: Grüninger, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The mixed-valent iridate Ba3InIr2O9 has been discussed as a promising candidate for quantum spin-liquid behavior. The compound exhibits Ir$^{4.5+}$ ions in face-sharing IrO6 octahedra forming Ir2O9 dimers with three t2g holes per dimer. Our results establish Ba3InIr2O9 as a cluster Mott insulator. Strong intra-dimer hopping delocalizes the three t2g holes in quasi-molecular dimer states while inter-dimer charge fluctuations are suppressed by Coulomb repulsion. The magnetism of Ba3InIr2O9 emerges from spin-orbit entangled quasi-molecular moments with yet unexplored interactions, opening up a new route to unconventional magnetic properties of 5d compounds. Using single-crystal x-ray diffraction we find the monoclinic space group C2/c already at room temperature. Dielectric spectroscopy shows insulating behavior. Resonant inelastic x-ray scattering (RIXS) reveals a rich excitation spectrum below 1.5 eV with a sinusoidal dynamical structure factor that unambiguously demonstrates the quasi-molecular character of the electronic states. Below 0.3 eV, we observe a series of excitations. According to exact diagonalization calculations, such low-energy excitations reflect the proximity of Ba3InIr2O9 to a hopping-induced phase transition based on the condensation of a quasi-molecular spin-orbit exciton. The dimer ground state roughly hosts two holes in a bonding j=1/2 orbital and the third hole in a bonding j=3/2 orbital.
description: 14 pages, 10 figures, V2: published version, minor changes
Joint quantum measurements with minimum uncertainty
Creators: name: Ringbauer, Martin
name: Biggerstaff, Devon N.
name: Broome, Matthew A.
name: Fedrizzi, Alessandro
name: Branciard, Cyril
name: White, Andrew G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum physics constrains the accuracy of joint measurements of incompatible observables. Here we test tight measurement-uncertainty relations using single photons. We implement two independent, idealized uncertainty-estimation methods, the 3-state method and the weak-measurement method, and adapt them to realistic experimental conditions. Exceptional quantum state fidelities of up to 0.99998(6) allow us to verge upon the fundamental limits of measurement uncertainty.
description: 13 pages, 12 figures
An improved Epidemiological-Unscented Kalman Filter (Hybrid SEIHCRDV-UKF) model for the prediction of COVID-19. Application on real-time data
Creators: name: Papageorgiou, Vasileios E.
name: Tsaklidis, George
Publisher: name: arXiv
Year: 2022
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Optimization and Control (math.OC)
subject: Applications (stat.AP)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 62M20, 60G35, 37A50, 62P10

description: The prevalence of COVID-19 has been the most serious health challenge of the 21th century to date, concerning national health systems on a daily basis, since December 2019 when it appeared in Wuhan City. Nevertheless, most of the proposed mathematical methodologies aiming to describe the dynamics of an epidemic, rely on deterministic models that are not able to reflect the true nature of its spread. In this paper, we propose a SEIHCRDV model - an extension/improvement of the classic SIR compartmental model - which also takes into consideration the populations of exposed, hospitalized, admitted in intensive care units (ICU), deceased and vaccinated cases, in combination with an unscented Kalman filter (UKF), providing a dynamic estimation of the time dependent system's parameters. The stochastic approach is considered necessary, as both observations and system equations are characterized by uncertainties. Apparently, this new consideration is useful for examining various pandemics more effectively. The reliability of the model is examined on the daily recordings of COVID-19 in France, over a long period of 265 days. Two major waves of infection are observed, starting in January 2021, which signified the start of vaccinations in Europe providing quite encouraging predictive performance, based on the produced NRMSE values. Special emphasis is placed on proving the non-negativity of SEIHCRDV model, achieving a representative basic reproductive number R0 and demonstrating the existence and stability of disease equilibria according to the formula produced to estimate R0. The model outperforms in predictive ability not only deterministic approaches but also state-of-the-art stochastic models that employ Kalman filters.
description: This article has been published in the journal Chaos, Solitons & Fractals with the title " An improved epidemiological-unscented Kalman filter (hybrid SEIHCRDV-UKF) model for the prediction of COVID-19. Application on real-time data "
Bio-optical properties of the marine diazotrophic cyanobacteria Trichodesmium spp. II. A reflectance model for remote sensing
Creators: name: Subramaniam, Ajit
name: Carpenter, Edward J.
name: Falkowski, Paul G.
Publisher: name: Columbia University
Year: 1999
Subjects: Oceanography--Remote sensing
Optical oceanography
Biogeochemistry
Trichodesmium
Marine biology
Marine ecology

description: The spatial and temporal distribution of Trichodesmium in the world's oceans is highly variable and can potentially be assessed using satellite imagery. Distinguishing these organisms from other phytoplankton in the upper ocean using remotely sensed information, however, requires an optical model that uniquely characterizes Trichodesmium. Here, we parameterize a standard remote-sensing reflectance model using measured values of Trichodesmium's inherent optical properties, namely the spectral dependence of the chlorophyll-specific optical absorption cross-sections and the spectral dependence of the chlorophyll-specific backscatter cross-sections. Values for the chlorophyll-specific absorption cross sections are described in the previous paper. We calculated the spectral chlorophyll-specific backscattering cross-section (b*b) from measurements of the chlorophyll-specific volume-scattering function and the spectral backscatter coefficients. b*b was 0.0027 m² (mg chlorophyll a [Chl a])⁻¹ at 436 nm and 0.002 m² (mg Chl a)⁻¹ at 546 nm; these cross-sections are approximately one order of magnitude higher than those for "typical" phytoplankton. The optical model revealed that the combination of high backscatter, absorption, and fluorescence could be used to distinguish moderate to high concentrations (>1 mg Chl m⁻³)of Trichodesmium from other phytoplankton. The model also predicted that surface scum blooms of Trichodesmium would have high reflectance in the near infrared. The high reflectance feature of surface Trichodesmium blooms was used in conjunction with sea truth and data from the advanced very high resolution radiometer (AVHRR) to map a 300,000-km² Trichodesmium bloom off the Somali Coast in May 1995. The nitrogen fixed by this bloom was estimated to be 9.4 × 10⁸ gN d⁻¹. These results demonstrate the potential of using remote-sensing techniques in the estimation of nitrogen fixation and the contribution of nitrogen fixation to global biogeochemical processes.
SUG'URTA INFRATUZILMASINI RIVOJLANTIRISH YO'LLARI
Creators: name: Olmosova Munisa Sherxon qizi Toshkent Davlat Iqtisodiyot Universiteti
Publisher: name: Zenodo
Year: 2023

description: Kalit so'zlar: Sug'urta, sug'urta bozori, raqamlashtirish, sug'urta mukofoti, sug'urta tovoni, sug'urtalovchi 
Annotatsiya
Ushbu maqolada O'zbekiston sug'urta bozorining hozirgi holati va uning rivojlanish istiqbollari tahlil qilingan. Bu borada sug'urta tizimini takomillashtirish va uni sohada amalga oshirish mexanizmlari ham amaliy, ham nazariy jihatdan tahlil qilindi.
Analysis of explicit and implicit discrete-time equivalent-control based sliding mode controllers
Creators: name: Huber, Olivier
name: Acary, Vincent
name: Brogliato, Bernard
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Different time-discretization methods for equivalent-control based sliding mode control (ECB-SMC) are presented. A new discrete-time sliding mode control scheme is proposed for linear time-invariant (LTI) systems. It is error-free in the discretization of the equivalent part of the control input. Results from simulations using the various discretized SMC schemes are shown, with and without perturbations. They illustrate the different behaviours that can be observed. Stability results for the proposed scheme are derived.
Equidistribution of points via energy
Creators: name: Pritsker, Igor E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 31C20, Secondary 30C15, 31C15, 11C08

description: We study the asymptotic equidistribution of points with discrete energy close to Robin's constant of a compact set in the plane. Our main tools are the energy estimates from potential theory. We also consider the quantitative aspects of this equidistribution. Applications include estimates of growth for the Fekete and Leja polynomials associated with large classes of compact sets, convergence rates of the discrete energy approximations to Robin's constant, and problems on the means of zeros of polynomials with integer coefficients.
description: arXiv admin note: text overlap with arXiv:1307.5841
title: Investigating Hydrological Changes andGroundwater Complexities in Bengaluru City, India: Exploring the Interactions of Urbanization and Data-Scarcity
Creators: name: Kulkarni, Tejas
Publisher: name: KOBRA Universität Kassel
Year: 2024
Subjects: subject: groundwater monitoring
subject: over-exploited hard-rock aquifers
subject: Bengaluru
subject: hydrological modelling
classificationCode: 500
subject: 500
classificationCode: 600
subject: 600
classificationCode: Indien
subject: Indien
classificationCode: Bangalore
subject: Bangalore
classificationCode: Grundwasserüberwachung
subject: Grundwasserüberwachung
classificationCode: Grundwasserleiter
subject: Grundwasserleiter
classificationCode: Nachhaltigkeit
subject: Nachhaltigkeit
classificationCode: Grundwasserentnahme
subject: Grundwasserentnahme
classificationCode: Bohrbrunnen
subject: Bohrbrunnen
classificationCode: Hydrologie
subject: Hydrologie
classificationCode: Modellierung
subject: Modellierung

description:
The rapid urbanization of Bengaluru, India, has led to significant challenges in water resource management, including the depletion of peri-urban rivers and the unsustainable exploitation of groundwater. Despite these challenges, concerns about water resource sustainability persist due to data limitations and complexities inherent in hard-rock aquifers, exacerbated by dynamic anthropogenic modifications to catchment processes. This doctoral thesis addresses two interconnected issues: the deepening of borewells within the city and the changing hydrological regime of peri-urban catchments, examined through a socio-ecological systems perspective.

description:
Die rapide Urbanisierung von Bengaluru, Indien, hat zu signifikanten Herausforderungen bei der Bewirtschaftung der Wasserressourcen geführt, darunter die Erschöpfung von Flüssen in Stadtrandlage und die unnachhaltige Ausnutzung von Grundwasser. Trotz dieser Herausforderungen bestehen weiterhin Bedenken hinsichtlich der Nachhaltigkeit der Wasserressourcen aufgrund der begrenzten Datenlage und der Komplexität der Grundwasserleiter im Festgestein, die durch die dynamischen anthropogenen Veränderungen der Wassereinzugsgebiete noch verschärft werden. Diese Doktorarbeit befasst sich mit zwei miteinander verbundenen Themen: der Vertiefung von Bohrbrunnen in der Stadt und dem sich verändernden hydrologischen Regime von stadtnahen Wassereinzugsgebieten, untersucht durch eine sozio-ökologische Systemperspektive.
An extensive bloom of the N₂-fixing cyanobacterium Trichodesmium erythraeum in the central Arabian Sea
Creators: name: Capone, Douglas G.
name: Subramaniam, Ajit
name: Montoya, Joseph P.
name: Voss, Maren
name: Humborg, Christoph
name: Johansen, Anne M.
name: Siefert, Ronald L.
name: Carpenter, Edward J.
Publisher: name: Columbia University
Year: 1998
Subjects: Cyanobacterial blooms
Nitrogen--Fixation
Trichodesmium
Oceanography--Remote sensing
Biogeochemistry
Marine biology
Marine ecology

description: We encountered an extensive surface bloom of the N, fixing cyanobactenum Trichodesrniurn erythraeum in the central basin of the Arabian Sea during the spring inter-monsooon of 1995. The bloom, which occurred dunng a period of calm winds and relatively high atmospheric iron content, was metabollcally active. Carbon fixation by the bloom represented about one-quarter of water column primary productivity while input by N₂ flxation could account for a major fraction of the estimated 'new' N demand of primary production. Isotopic measurements of the N in surface suspended material confirmed a direct contribution of N₂ fixation to the organic nltrogen pools of the upper water column. Retrospective analysis of NOAA-12 AVHRR imagery indicated that blooms covered up to 2 X 10⁶ km², or 20% of the Arabian Sea surface, during the period from 22 to 27 May 1995. In addition to their biogeochemical impact, surface blooms of this extent may have secondary effects on sea surface albedo and light penetration as well as heat and gas exchange across the air-sea interface. A preliminary extrapolation based on our observed, non-bloom rates of N₂ fixation from our limited sampling in the spring intermonsoon including a conservative estimate of the input by blooms, suggest N₂ fixation may account for an input of about 1 Tg N yr⁻¹. This is substantial, but relatively minor compared to current estimates of the removal of N through denitrification in the basin. However, N₂ fixation may also occur in the central basin through the mild winter monsoon, be considerably greater during the fall intermonsoon than we observed during the spring intermonsoon, and may also occur at higher levels in the chronically oligotrophic southern basin. Ongoing satellite observations will help to determine more accurately the distribution and density of Trichodesmium in this and other tropical oceanic basins, as well as resolving the actual frequency and duration of bloom occurrence.
INDIGENOUS FIRE MANAGEMENT: LEGAL ANALYSIS AND LOCAL WISDOM IN CENTRAL KALIMANTAN
Creators: name: PASMA ROYCE
name: YUSRIYADI
name: SUKIRNO
Publisher: name: Zenodo
Year: 2023
Subjects: Press Law, Press Council, Press freedom, Quasi-Rechtpraak, Journalism

description: Abstract
This study aims to analyze the position of the Press Council as a quasi rechtpraak in press freedom in Indonesia. The research method used is a qualitative method. The results showed that the handling of press cases involved special institutions that were not found in law enforcement in other cases, both ordinary and extraordinary crimes. The special institution referred to is the Press Council. According to the provisions of Article 5 paragraph (2) Law Number 40 of 1999 concerning the Press, the functions of the Press Council include determining and supervising the implementation of the Journalistic Code of Ethics and providing considerations and seeking to resolve public complaints on cases related to press coverage. However, if the case in question has been handled by the police, the Press Council will not handle the complaint. The mechanism through the Press Law has been recognized, and even based on a number of legal considerations in the Constitutional Court's decision, a case of press coverage without or not initiated through the process of using the Right to Reply or until settlement through the Press Council, is deemed incompatible with the Press Law and lawsuit or conviction. Over the case is likely to be defeated.
Early Results from GLASS-JWST. I: Confirmation of Lensed $z\geqslant7$ Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS
Creators: name: Roberts-Borsani, Guido
name: Morishita, Takahiro
name: Treu, Tommaso
name: Brammer, Gabriel
name: Strait, Victoria
name: Wang, Xin
name: Bradac, Marusa
name: Acebron, Ana
name: Bergamini, Pietro
name: Boyett, Kristan
name: Calabró, Antonello
name: Castellano, Marco
name: Fontana, Adriano
name: Glazebrook, Karl
name: Grillo, Claudio
name: Henry, Alaina
name: Jones, Tucker
name: Malkan, Matthew
name: Marchesini, Danilo
name: Mascia, Sara
name: Mason, Charlotte
name: Mercurio, Amata
name: Merlin, Emiliano
name: Nanayakkara, Themiya
name: Pentericci, Laura
name: Rosati, Piero
name: Santini, Paola
name: Scarlata, Claudia
name: Trenti, Michele
name: Vanzella, Eros
name: Vulcani, Benedetta
name: Willott, Chris
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first search for $z\geqslant7$, continuum-confirmed sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST ERS survey. With $\sim15$ hrs of pre-imaging and multi-angle grism exposures in the F115W, F150W, and F200W filters, we describe the general data handling (i.e., reduction, cleaning, modeling, and extraction processes) and analysis for the GLASS-JWST survey. We showcase the power of JWST to peer deep into reionization, when most intergalactic hydrogen is neutral, by confirming two galaxies at $z=8.04\pm0.15$ and $z=7.90\pm0.13$ by means of their Lyman breaks. Fainter continuum spectra are observed in both the F150W and F200W bands, indicative of blue ($-1.69$ and $-1.33$) UV slopes and moderately-bright absolute magnitudes ($-20.37$ and $-19.68$ mag). We do not detect strong Ly$α$ in either galaxy, but do observe tentative ($\sim2.7-3.8σ$) HeII$λ$1640 A, OIII]$λλ$1661,1666 A, and NIII]$λλ$1747,1749 A line emission in one, suggestive of low metallicity, star-forming systems with possible non-thermal contributions. These novel observations provide a first look at the extraordinary potential of JWST/NIRISS for confirming representative samples of bright $z\geqslant7$ sources in the absence of strong emission lines, and gain unprecedented insight into their contributions towards cosmic reionization.
description: Accepted for publication in ApJL on 1st September 2022, after minor modifications based on the referee report. 10 pages, 3 figures, 1 table
Influence of the Amazon River plume on distributions of free-living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean
Creators: name: Foster, R. A.
name: Subramaniam, Ajit
name: Mahaffey, C.
name: Carpenter, E. J.
name: Capone, D. G.
name: Zehr, J. P.
Publisher: name: Columbia University
Year: 2007
Subjects: Cyanobacteria
Marine ecology
Biogeochemistry
Chemical oceanography

description: The vertical and horizontal distributions of seven diazotrophic populations in the western tropical north Atlantic (WTNA) Ocean were examined using a nifH DNA quantitative polymerase chain reaction (QPCR) approach. The nifH phylotype abundances were highest near the surface and decreased with depth, with the exception of the cyanobacterial symbiont Calothrix, which was not detected at any station. Richelia associated with the diatoms Rhizosolenia clevei and Hemiaulus hauckii were distributed within the freshwater lens of the Amazon plume. Abundances of H. hauckii-Richelia nifH genes dominated all depths in 6 of 10 vertical profiles and 10 of 20 surface samples. In addition, estimates of Richelia associated with H. hauckii increased northwest (8- 12°N, 56-54°W) from the river mouth, where significantly ( p < 0.001) higher abundances (>10⁵ copies L⁻¹) were found in mesohaline waters (31-34.9). nifH copy abundance for surface populations of the H. hauckii-Richelia symbioses were positively correlated (r² = 0.59) with salinity. Three unicellular cyanobacterial groups and Trichodesmium had similar horizontal distributions, where the highest nifH copy estimates were at stations with salinity ≥35 and northeast (6-10°N 50°W) of the freshwater lens. The abundance of Trichodesmium spp. and unicellular Group B nifH gene copies co-varied (r² = 0.60). The QPCR study showed the dominance of H. hauckii-Richelia symbioses in the Amazon plume waters, implying that these associations had an ecological advantage over the other diazotrophs. Outside of the plume nutrients were below detection, abundances of freeliving unicellular cyanobacterial phylotypes, including a novel group designated Group C, were abundant (>10⁵ copies L⁻¹) and comparable to the abundances of Trichodesmium spp. Thus, there appeared to be a cascade of diazotrophic communities along gradients of salinity and nutrients in the WTNA.
Decision support for modularisation: engineering construction case studies
Creators: name: Monib, Rolla
Publisher: name: Loughborough University
Year: 2021
Subjects: Other built environment and design not elsewhere classified

description: Over the last few decades, numerous researchers have investigated the design, construction and performance of building construction projects. Few studies, however, have investigated the performance of the engineering construction (EC) sector, and even fewer, specifically within the Middle East region. Previous studies (i.e. Haas and Fagerlund, 2002; Bondi et al., 2016) have concluded that a lack of modularisation awareness is among the key factors attributed to the construction inefficiency of projects. Although the benefits of modularisation have been examined previously, mainly in the building sector, the decision regarding the drivers of the degree of modularisation have rarely been investigated. Therefore, the aim of this research is to investigate the decision support strategies in the engineering construction sector to determine the best degree of modularisation.
The quark contents of the nucleon and their implication for dark matter search
Creators: name: Alexandrou, C.
name: Constantinou, M.
name: Drach, V.
name: Hadjiyiannakou, K.
name: Jansen, K.
name: Koutsou, G.
name: Strelchenko, A.
name: Vaquero, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present results concerning the light and strange quark contents of the nucleon using $N_f=2+1+1$ flavours of maximally twisted mass fermions. The corresponding $σ$-terms are casting light on the origin of the nucleon mass and their values are important to interpret experimental data from direct dark matter searches. We discuss our strategy to estimate systematic uncertainties arising in our computations. Our preliminary results for the $σ-$terms read $σ_{πN} = 37(2.6)(24.7) \mev$ and $σ_s=28(8)(10) \mev$. We present our recent final analysis of the $y_N$ parameter and found $y_N=0.135(46)$ including systematics\cite{Alexandrou:2013nda}.
description: 7 pages, 6 figures, talk given at the 31st International Symposium on Lattice Field Theory (Lattice 2013), July 29-August 3 2013, Mainz, Germany
Flat-band-induced superconductivity in synthetic bilayer optical lattices
Creators: name: Salamon, Tymoteusz
name: Irsigler, Bernhard
name: Rakshit, Debraj
name: Lewenstein, Maciej
name: Grass, Tobias
name: Chhajlany, Ravindra
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Stacking two layers of graphene with a relative twist angle gives rise to moiré patterns, which can strongly modify electronic behavior and may lead to unconventional superconductivity. A synthetic version of twisted bilayers can be engineered with cold atoms in optical lattices. Here, the bilayer structure is mimicked through coupling between atomic sublevels, and the twist is achieved by a spatial modulation of this coupling. In the present paper, we investigate the superconducting behavior of fermionic atoms in such a synthetic twisted bilayer lattice. Attractive interactions between the atoms are treated on the mean-field level, and the superconducting behavior is analyzed via the self-consistently determined pairing gap. A strong enhancement of the pairing gap is found, when a quasi-flat band structure occurs at the Fermi surface, reflecting the prominent role played by the twist on the superconductivity. The tunability of interactions allows for the switching of superconducting correlations from intra (synthetic) layer to inter (synthetic) layer. This includes also the intermediate scenario, in which the competition between inter- and intra-layer coupling completely destroys the superconducting behavior, resulting in re-entrant superconductivity upon tuning of the interactions
description: We warmly dedicate this paper to Prof. Roman Micnas - a pioneer of theory of superconductivity with local electron pairing, who passed away on 13th of January, 2022