cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Utilizing the Structure of the Curvelet Transform with Compressed Sensing
Creators: name: Dwork, Nicholas
name: Larson, Peder E. Z.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The discrete curvelet transform decomposes an image into a set of fundamental components that are distinguished by direction and size as well as a low-frequency representation. The curvelet representation is approximately sparse; thus, it is a useful sparsifying transformation to be used with compressed sensing. However, the low-frequency portion is seldom sparse. This manuscript presents a method to modify the redundant sparsifying transformation comprised of the wavelet and curvelet transforms to take advantage of this fact with compressed sensing image reconstruction. Instead of relying on sparsity for this low-frequency estimate, the Nyquist-Shannon theorem specifies a square region centered on the $0$ frequency to be collected, which is used to generate a blurry estimate. A Basis Pursuit Denoising problem is solved to determine the missing details after modifying the sparsifying transformation to take advantage of the known fully sampled region. Improvements in quality are shown on magnetic resonance and optical images.
Probing reionization with LOFAR using 21-cm redshift space distortions
Creators: name: Jensen, Hannes
name: Datta, Kanan K.
name: Mellema, Garrelt
name: Chapman, Emma
name: Abdalla, Filipe B.
name: Iliev, Ilian T.
name: Mao, Yi
name: Santos, Mario G.
name: Shapiro, Paul R.
name: Zaroubi, Saleem
name: Bernardi, G.
name: Brentjens, M. A.
name: de Bruyn, A. G.
name: Ciardi, B.
name: Harker, G. J. A.
name: Jelić, V.
name: Kazemi, S.
name: Koopmans, L. V. E.
name: Labropoulos, P.
name: Martinez, O.
name: Offringa, A. R.
name: Pandey, V. N.
name: Schaye, J.
name: Thomas, R. M.
name: Veligatla, V.
name: Vedantham, H.
name: Yatawatta, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: One of the most promising ways to study the epoch of reionization (EoR) is through radio observations of the redshifted 21-cm line emission from neutral hydrogen. These observations are complicated by the fact that the mapping of redshifts to line-of-sight positions is distorted by the peculiar velocities of the gas. Such distortions can be a source of error if they are not properly understood, but they also encode information about cosmology and astrophysics. We study the effects of redshift space distortions on the power spectrum of 21-cm radiation from the EoR using large scale $N$-body and radiative transfer simulations. We quantify the anisotropy introduced in the 21-cm power spectrum by redshift space distortions and show how it evolves as reionization progresses and how it relates to the underlying physics. We go on to study the effects of redshift space distortions on LOFAR observations, taking instrument noise and foreground subtraction into account. We find that LOFAR should be able to directly observe the power spectrum anisotropy due to redshift space distortions at spatial scales around $k \sim 0.1$ Mpc$^{-1}$ after $\gtrsim$ 1000 hours of integration time. At larger scales, sample errors become a limiting factor, while at smaller scales detector noise and foregrounds make the extraction of the signal problematic. Finally, we show how the astrophysical information contained in the evolution of the anisotropy of the 21-cm power spectrum can be extracted from LOFAR observations, and how it can be used to distinguish between different reionization scenarios.
description: Accepted for publication in MNRAS
title: Implementation of decision trees for data streams in the Spark Streaming platform
title: Υλοποίηση δέντρων αποφάσεων για ροές δεδομένων στην πλατφόρμα Spark Streaming
Creators: name: Ζιακας Χρηστος
Publisher: name: Technical University of Crete
Year: 2018

description: In the era of big data, enormous amounts of data are created, replicated
and transferred every day. The current technology for handling and analyzing
vast amounts of data allows us to develop applications for various problems
(e.g., DNA sequence analysis, medical imaging, traffic control) that could not
previously be solved efficiently. More precisely, the time required to process
large volumes of data can be minimized by using distributed computing platforms
such as Apache Spark. The Apache Spark framework includes various
implementations for large-scale machine learning, distributed data streaming
processing and parallel graph analytics. The Spark Streaming platform provides
scalable and fault-tolerant data streaming processing. However, there is
only a limited number of implemented distributed incremental machine learning
algorithms available in the Spark Streaming platform.

In this thesis, we propose a parallel implementation of an incremental and
scalable tree learning method for classification in Spark Streaming, the Hoeffding
decision tree. Our proposed implementation performs horizontal data
parallelism in the shared-nothing architecture of Spark. The Hoeffding bound
guarantees with high confidence that the Hoeffding decision tree is asymptotically
identical to a batch-learning one. The high dimensional statistics, required
for evaluating splits, are stored as sparse matrices in main memory
across the Spark cluster. These statistics are instantly updated, when new
training instances are available. Furthermore, distributed computations are
performed in order to identify the optimal split and assess whether the splitting
criterion is satisfied. The generated model is used in order to make color
classification based on the spectral signature of each color. Each color has a
different chemical composition, and as a consequence a different spectral signature.
Prior-Guided Deep Interference Mitigation for FMCW Radars
Creators: name: Wang, Jianping
name: Li, Runlong
name: He, Yuan
name: Yang, Yang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A prior-guided deep learning (DL) based interference mitigation approach is proposed for frequency modulated continuous wave (FMCW) radars. In this paper, the interference mitigation problem is tackled as a regression problem. Considering the complex-valued nature of radar signals, the complex-valued convolutional neural network is utilized as an architecture for implementation, which is different from the conventional real-valued counterparts. Meanwhile, as the useful beat signals of FMCW radars and interferences exhibit different distributions in the time-frequency domain, this prior feature is exploited as a regularization term to avoid overfitting of the learned representation. The effectiveness and accuracy of our proposed complex-valued fully convolutional network (CV-FCN) based interference mitigation approach are verified and analyzed through both simulated and measured radar signals. Compared to the real-valued counterparts, the CV-FCN shows a better interference mitigation performance with a potential of half memory reduction in low Signal to Interference plus Noise Ratio (SINR) scenarios. Moreover, the CV-FCN trained using only simulated data can be directly utilized for interference mitigation in various measured radar signals and shows a superior generalization capability. Furthermore, by incorporating the prior feature, the CV-FCN trained on only 1/8 of the full data achieves comparable performance as that on the full dataset in low SINR scenarios, and the training procedure converges faster.
description: 14 pages, 16 figures
Rethinking Crowdsourcing Annotation: Partial Annotation with Salient Labels for Multi-Label Image Classification
Creators: name: Lin, Jianzhe
name: Yu, Tianze
name: Wang, Z. Jane
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Annotated images are required for both supervised model training and evaluation in image classification. Manually annotating images is arduous and expensive, especially for multi-labeled images. A recent trend for conducting such laboursome annotation tasks is through crowdsourcing, where images are annotated by volunteers or paid workers online (e.g., workers of Amazon Mechanical Turk) from scratch. However, the quality of crowdsourcing image annotations cannot be guaranteed, and incompleteness and incorrectness are two major concerns for crowdsourcing annotations. To address such concerns, we have a rethinking of crowdsourcing annotations: Our simple hypothesis is that if the annotators only partially annotate multi-label images with salient labels they are confident in, there will be fewer annotation errors and annotators will spend less time on uncertain labels. As a pleasant surprise, with the same annotation budget, we show a multi-label image classifier supervised by images with salient annotations can outperform models supervised by fully annotated images. Our method contributions are 2-fold: An active learning way is proposed to acquire salient labels for multi-label images; and a novel Adaptive Temperature Associated Model (ATAM) specifically using partial annotations is proposed for multi-label image classification. We conduct experiments on practical crowdsourcing data, the Open Street Map (OSM) dataset and benchmark dataset COCO 2014. When compared with state-of-the-art classification methods trained on fully annotated images, the proposed ATAM can achieve higher accuracy. The proposed idea is promising for crowdsourcing data annotation. Our code will be publicly available.
title: The Anatomy of Sentiment-Driven Fluctuations
Creators: name: Acharya, Sushant
name: Benhabib, Jess
name: Huo, Zhen
Publisher: name: Bank of Canada
Year: 2021

description: We show that changes in sentiment that aren’t related to fundamentals can drive persistent macroeconomic fluctuations even when all economic agents are rational. Changes in sentiment can also affect how fundamental shocks affect macroeconomic outcomes.

description: Nous montrons que des changements du niveau de confiance des agents économiques, sans lien avec les facteurs fondamentaux, peuvent engendrer des fluctuations macroéconomiques persistantes, alors même que tous ces agents se comportent de manière rationnelle. Ces changements peuvent aussi influencer la manière dont les chocs fondamentaux se répercutent sur l’équilibre macroéconomique.
Binary Black Hole Merger Rates in AGN Disks versus Nuclear Star Clusters: Loud beats Quiet
Creators: name: Ford, K. E. Saavik
name: McKernan, Barry
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galactic nuclei are promising sites for stellar origin black hole (BH) mergers, as part of merger hierarchies in deep potential wells. We show that binary black hole (BBH) merger rates in active galactic nuclei (AGN) should always exceed merger rates in quiescent galactic nuclei (nuclear star clusters, NSCs) around supermassive BHs (SMBHs) without accretion disks. This is primarily due to average binary lifetimes in AGN that are significantly shorter than in NSCs. The lifetime difference comes from rapid hardening of BBHs in AGN, such that their semi-major axes are smaller than the hard-soft boundary of their parent NSC; this contrasts with the large average lifetime to merger for BBHs in NSCs around SMBHs, due to binary ionization mechanisms. Secondarily, merger rates in AGNs are enhanced by gas-driven binary formation mechanisms. Formation of new BHs in AGN disks are a minor contributor to the rate differences. With the gravitational wave detection of several BBHs with at least one progenitor in the upper mass gap, and signatures of dynamical formation channels in the $χ_{\rm eff}$ distribution, we argue that AGN could contribute $\sim 25\%-80\%$ of the LIGO-Virgo measured rate of $\sim 24 \rm{Gpc}^{-3} \rm{yr}^{-1}$.
description: 8 pages, 1 figure, submitted to MNRAS
Hinweis
Creators: name: Fritsch, Andreas
Publisher: name: Forum Classicum
Year: 2017

description: Hinweis auf:
Elisabeth Nerl: Den alten Römern in den Kochtopf geschaut. 13 römische Rezepte (meist aus Apicius), ausprobiert, versehen mit Mengenangaben für vier Personen. 24 Seiten, Format DIN A 5. Zu beziehen bei Rudolf Spann, Verlag und Versand, Panoramastraße 23, 82211 Herrsching. Bestell- Nr. 08.

G. E. Thüry / J. Walter: Condimenta. Gewürzpflanzen in Koch- und Backrezepten aus der römischen Antike. Hrsg. von Michael Kiehn, Institut für Botanik und Botanischer Garten der Universität Wien. 3. Aufl. Herrsching: R Spann 1999. Ebenfalls zu beziehen bei Rudolf Spann (s. o.). Bestell-Nr. 953.

Arthur Geisert: NVMERI ROMANI AB VNO AD DVO MILIA. Die römischen Zahlen von I bis MM. Carl Hanser Verlag (Kinderbuch). Postfach 86 04 20, D-81631 München. Titel-Nr. 19734. 34 Seiten.
description: Forum Classicum, Nr. 4 (1999): Forum Classicum
P. V. Khan - Buddhism, 1st Phase ; Hermetism ; Meditation Seminar
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Meditation
Spiritual life
Buddhism
Sufism--Customs and practices
Hermetism
Religion and civil society

description: Part 7: A man leads a discussion about meditation and consciousness with others; Part 10: Speech about alchemy, seeing divinity in humanity, the symbiosis of soul and body, meditation, stages of consciousness, chemistry; Part 21: A man speaks and is translated. He is speaking at Columbia University. He talks about global politics, and that there is an imminent crisis. He talks about revolution, and desire, and how desire is affected by capitalism
A categorical invariant of flow equivalence of shifts
Creators: name: Costa, Alfredo
name: Steinberg, Benjamin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Dynamical Systems (math.DS)
subject: Formal Languages and Automata Theory (cs.FL)
subject: Category Theory (math.CT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We prove that the Karoubi envelope of a shift --- defined as the Karoubi envelope of the syntactic semigroup of the language of blocks of the shift --- is, up to natural equivalence of categories, an invariant of flow equivalence. More precisely, we show that the action of the Karoubi envelope on the Krieger cover of the shift is a flow invariant. An analogous result concerning the Fischer cover of a synchronizing shift is also obtained. From these main results, several flow equivalence invariants --- some new and some old --- are obtained. We also show that the Karoubi envelope is, in a natural sense, the best possible syntactic invariant of flow equivalence of sofic shifts. Another application concerns the classification of Markov-Dyck and Markov-Motzkin shifts: it is shown that, under mild conditions, two graphs define flow equivalent shifts if and only if they are isomorphic. Shifts with property (A) and their associated semigroups, introduced by Wolfgang Krieger, are interpreted in terms of the Karoubi envelope, yielding a proof of the flow invariance of the associated semigroups in the cases usually considered (a result recently announced by Krieger), and also a proof that property (A) is decidable for sofic shifts.
title: Spectral photography
title: Φασματική φωτογραφία
Creators: name: Γεωργιου Γεωργιος
Publisher: name: Technical University of Crete
Year: 2018

description: A common topic which concerns the color industry is the way to optimally reproduce color stimulus identical to the color we are capable of seeing. With spectroscopic technology we can measure surface spectral reflectances of Colorimetric Charts which are the golden standards in color science. Multiple light sources are acquired to form a Spectral Power Distribution Database that could help extract the spectral signatures of different illumination scenarios. Using this Database and exploiting the spectral information features of both the Visible and Near Infrared spectrum each illuminant type has, we can spectrally match the given illumination and reproduce accurately color from spectral data. Using spectral comparison metrics, illuminant estimation is achieved and color difference measurements across patches on spectrally reconstructed images will lead to the creation of true, according to human vision, computational color with illumination independency.
5G-ROUTES: D1.5 Methodologies for cross-border collaboration and validation of 5G features for CAM
Creators: name: Krupp, Margus
Publisher: name: Zenodo
Year: 2022

description: The aim of this project is to conduct advanced field trials of most representative and innovative Connected and Automotive Mobility (CAM) applications, so as to accelerate the widespread deployment of 5G End to End (E2E) interoperable CAM ecosystems and services in digitized motorways, railways and shipways throughout Europe. The scope of the project spans the borders of 3 European Union (EU) member states (Latvia-Estonia-Finland) in order to validate the latest 5G features and 3GPP specifications under realistic conditions and their seamless functioning across a designated 5G cross-border corridor. This deliverable will focus on defining the methodology for a comprehensive and robust test analysis of the 5G network features within a cross-border context that are essential for the CAM use cases developed in 5GROUTES. Working closely with the partners defining the scenarios to be validated in cross-border field trials, formats for a suite of test cases will be specified to measure the functionality and performance of the innovative solutions being put forward. These test artefacts will be captured based on the methodology developed that will enable them to integrate seamlessly with the development process. It is ensured that the CAM testing strategy examines the improvement over previous 4G capabilities. The testing methodologies in the report builds on the expertise and results of other projects, such as 5G-TOURS, 5G-MOBIX, 5G-EVE, but also on Next Generation Mobile Networks (NGNM) Alliance Testing Methodology reports, Third Generation Partnership Project (3GPP) and International Telecommunication Union (ITU) documents. These methodologies cover testing of network Performance Indicators (PI) to ensure 5G network capabilities for all the test locations and use-cases in the scope of 5G-ROUTES. It starts from describing the network level PIs following with the methodologies for validating and testing. For this deliverable it was decided to go with the PIs and not to cluster them into a higher-level Key Performance Indicators (KPI) as it is not needed for network validation. However in the later stages of the project the KPIs can be selected if needed – those will be described then in D1.6. This deliverable gives the overview of the PIs and their test methodologies at the current state of the project (end of month 16 of implementation). The final version of this report (deliverable D1.6, due in month 36) will be adjusted by the insights gathered from the first phase of the large-scale trials execution.
Hadronic Decays of Charmed Hadron
Creators: name: Xie, X. H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The BESIII experiment has collected the $e^+e^-$ collision data samples corresponding to integrated luminosities of 2.93 $\mathrm{fb}^{-1}$, $3.19$ $\mathrm{fb}^{-1}$, 3.13 $\mathrm{fb}^{-1}$ and 567 $\mathrm{pb}^{-1}$ at center-of-mass energies of 3.773 GeV, 4.178 GeV, 4.189-4.226 GeV and 4.599 GeV, respectively. We report the measurements of strong-phase parameters based on the decays $D^0\to K^0_{S/L}π^+π^-$, $D^0\to K^0_{S/L}K^+K^-$, $D^0\to K^-π^+π^+π^-$ and $D^0\to K^-π^+π^0$, which are important input for binned model-independent measurement of the CKM angle $γ/ϕ_3$. In addition, we report amplitude analyses and branching fraction measurements of $D^+$, $D_s^+$ and $Λ_c^+$ decays along with the $Λ_c^+$ spin determination.
description: Proceeding for the conference QCD2021
Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: This paper presents a summary of beam-induced backgrounds observed in the ATLAS detector and discusses methods to tag and remove background contaminated events in data. Trigger-rate based monitoring of beam-related backgrounds is presented. The correlations of backgrounds with machine conditions, such as residual pressure in the beam-pipe, are discussed. Results from dedicated beam-background simulations are shown, and their qualitative agreement with data is evaluated. Data taken during the passage of unpaired, i.e. non-colliding, proton bunches is used to obtain background-enriched data samples. These are used to identify characteristic features of beam-induced backgrounds, which then are exploited to develop dedicated background tagging tools. These tools, based on observables in the Pixel detector, the muon spectrometer and the calorimeters, are described in detail and their efficiencies are evaluated. Finally an example of an application of these techniques to a monojet analysis is given, which demonstrates the importance of such event cleaning techniques for some new physics searches.
description: 54 pages plus author list (67 pages total), 36 figures, 5 tables, submitted to JINST, revision matches published version, all figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/DAPR-2012-01/
Strongly solvable spaces
Creators: name: Jablonski, Michael
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C25, 53C30, 22E25

description: This work builds on the foundation laid by Gordon and Wilson in the study of isometry groups of solvmanifolds, i.e. Riemannian manifolds admitting a transitive solvable group of isometries. We restrict ourselves to a natural class of solvable Lie groups called almost completely solvable; this class includes the completely solvable Lie groups. When the commutator subalgebra contains the center, we have a complete description of the isometry group of any left-invariant metric using only metric Lie algebra information. Using our work on the isometry group of such spaces, we study quotients of solvmanifolds. Our first application is to the classification of homogeneous Ricci soliton metrics. We show that the verification of the Generalized Alekseevsky Conjecture reduces to the simply-connected case. Our second application is a generalization of a result of Heintze on the rigidity of existence of compact quotients for certain homogeneous spaces. Heintze's result applies to spaces with negative curvature. We remove all the geometric requirements, replacing them with algebraic requirements on the homogeneous structure.
description: 26 pp, minor changes from v1, final version to appear in Duke Math. Journal
U.S. Food-Related Water Use Varies by Food Category, Supply Chain Stage, and Dietary Pattern
Creators: name: Rehkamp, Sarah
name: Canning, Patrick
name: Rehkamp, Sarah
name: Canning, Patrick
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agribusiness
subject: Consumer/Household Economics
subject: Crop Production/Industries
subject: Environmental Economics and Policy
subject: Industrial Organization
subject: Land Economics/Use
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Resource /Energy Economics and Policy
subject: U.S. food system
subject: water consumption
subject: groundwater
subject: surface water
subject: system water
subject: crop production
subject: livestock production
subject: processing and packaging
subject: distribution and marketing
subject: energy
subject: households
subject: water usage
subject: water
subject: supply chain
subject: dietary pattern

description: Water is a key input for food production. It is used on farms to grow crops, raise livestock, clean processing equipment, generate electricity, and rinse produce. While water is important, available freshwater for human use is scarce. Much like other natural resources, freshwater is faced with supply and demand stresses, including population growth, climate change, and changing consumer preferences.
Stochastic paths controlling speed and dissipation
Creators: name: Bone, Rebecca A.
name: Sharpe, Daniel J.
name: Wales, David J.
name: Green, Jason R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Near equilibrium, thermodynamic intuition suggests that fast, irreversible processes will dissipate more energy and entropy than slow, quasistatic processes connecting the same initial and final states. Here, we test the hypothesis that this relationship between speed and dissipation holds for stochastic processes far from equilibrium. To analyze these processes on finite timescales, we derive an exact expression for the path probabilities of continuous-time Markov chains from the path summation solution of the master equation. Applying this formula to a model for nonequilibrium self-assembly, we show that more speed can lead to less dissipation when there are strong nonequilibrium currents. In the model, the relative energies of the initial and target states control the speed, and the nonequilibrium currents of a cycle situated between these states control the path-level dissipation. This model serves as a minimal prototype for designing kinetics to sculpt the nonequilibrium path space, so that faster structure-forming paths dissipate less.
Herkuleskeule und Donar-Amulett
Creators: name: Werner, Joachim
Publisher: name: Verlag des Römisch-Germanischen Zentralmuseums Mainz
Year: 2017
Subjects: Römerzeit; Mitteleuropa; Amulette; Anhänger

description: [nicht vorhanden / not available]
description: Jahrbuch des Römisch-Germanischen Zentralmuseums Mainz, Bd. 11 (1964)
Survey data and Bayesian analysis: a cost-efficient way to estimate customer equity
Creators: name: Karvanen, Juha
name: Rantanen, Ari
name: Luoma, Lasse
Publisher: name: arXiv
Year: 2013
Subjects: subject: Applications (stat.AP)
subject: General Finance (q-fin.GN)
subject: FOS: Computer and information sciences
subject: FOS: Economics and business
subject: G.3; J.1
subject: 62N02, 62-07, 62F15

description: We present a Bayesian framework for estimating the customer lifetime value (CLV) and the customer equity (CE) based on the purchasing behavior deducible from the market surveys on customer purchasing behavior. The proposed framework systematically addresses the challenges faced when the future value of customers is estimated based on survey data. The scarcity of the survey data and the sampling variance are countered by utilizing the prior information and quantifying the uncertainty of the CE and CLV estimates by posterior distributions. Furthermore, information on the purchase behavior of the customers of competitors available in the survey data is integrated to the framework. The introduced approach is directly applicable in the domains where a customer relationship can be thought to be monogamous. As an example on the use of the framework, we analyze a consumer survey on mobile phones carried out in Finland in February 2013. The survey data contains consumer given information on the current and previous brand of the phone and the times of the last two purchases.
Holomorphic semigroups of finite shift in the unit disc
Creators: name: Cordella, Davide
Publisher: name: arXiv
Year: 2021
Subjects: subject: Complex Variables (math.CV)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37C10, 30C35 (Primary) 30D05, 30C80, 37F99, 37C25 (Secondary)

description: We give three necessary and sufficient conditions so that a parabolic holomorphic semigroup $(ϕ_t)$ in the unit disc is of finite shift. One is in terms of the asymptotic behavior of speeds of convergence, the second one is related to the hyperbolic metric of its Koenigs domain $Ω$ and the latter one deals with Euclidean properties of $Ω$.
Near-Intrinsic Photo- and Electroluminescence from Single-Walled Carbon Nanotube Thin Films on BCB-Passivated Surfaces
Creators: name: Zorn, Nicolas F.
name: Settele, Simon
name: Zhao, Shen
name: Lindenthal, Sebastian
name: Yumin, Abdurrahman Ali El
name: Wedl, Tim
name: Li, Han
name: Flavel, Benjamin S.
name: Högele, Alexander
name: Zaumseil, Jana
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Their outstanding electrical and optical properties make semiconducting single-walled carbon nanotubes (SWCNTs) highly suitable for charge transport and emissive layers in near-infrared optoelectronic devices. However, the luminescence spectra of SWCNT thin films on commonly used glass and Si/SiO2 substrates are often compromised by broadening of the main excitonic emission and unwanted low-energy sidebands. Surface passivation with a commercially available, low dielectric constant, cross-linked bis-benzocyclobutene-based polymer (BCB) enhances the emission properties of SWCNTs to the same level as hexagonal boron nitride (h-BN) flakes do. The presence of BCB suppresses sideband emission, especially from the Y1 band, which is attributed to defects introduced by the interaction of the nanotube lattice with oxygen-containing terminal groups of the substrate surface. The facile and reproducible deposition of homogeneous BCB films over large areas combined with their resistance against common solvents and chemicals employed during photolithography make them compatible with standard semiconductor device fabrication. Utilizing this approach, light-emitting (6,5) SWCNT network field-effect transistors are fabricated on BCB-treated glass substrates with excellent electrical characteristics and near-intrinsic electroluminescence. Hence, passivation with BCB is proposed as a standard treatment for substrates used for spectroscopic investigations of and optoelectronic devices with SWCNTs and other low-dimensional emitters.
Diffractive lensless imaging with optimized Voronoi-Fresnel phase
Creators: name: Fu, Qiang
name: Yan, Dong-Ming
name: Heidrich, Wolfgang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Optics (physics.optics)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Lensless cameras are a class of imaging devices that shrink the physical dimensions to the very close vicinity of the image sensor by replacing conventional compound lenses with integrated flat optics and computational algorithms. Here we report a diffractive lensless camera with spatially-coded Voronoi-Fresnel phase to achieve superior image quality. We propose a design principle of maximizing the acquired information in optics to facilitate the computational reconstruction. By introducing an easy-to-optimize Fourier domain metric, Modulation Transfer Function volume (MTFv), which is related to the Strehl ratio, we devise an optimization framework to guide the optimization of the diffractive optical element. The resulting Voronoi-Fresnel phase features an irregular array of quasi-Centroidal Voronoi cells containing a base first-order Fresnel phase function. We demonstrate and verify the imaging performance for photography applications with a prototype Voronoi-Fresnel lensless camera on a 1.6-megapixel image sensor in various illumination conditions. Results show that the proposed design outperforms existing lensless cameras, and could benefit the development of compact imaging systems that work in extreme physical conditions.
description: 17 pages, 11 figures, 1 video, 1 video description, and 1 supplemental document
Singlet Portal Extensions of the Standard Seesaw Models to a Dark Sector with Local Dark Symmetry
Creators: name: Baek, Seungwon
name: Ko, P.
name: Park, Wan-Il
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Assuming ({\it i}) the seesaw mechanism works for neutrino masses and mixings, ({\it ii}) dark matter is absolutely stable due to unbroken $U(1)_X$ dark gauge symmetry, and ({\it iii}) the singlet fields ($H^\dagger H$ and $N_R$) are portal to the dark sector, we construct a simple model which is consistent with all the cosmological observations as well as terrestrial experiments available as of now, including leptogenesis, extra dark radiation of $\sim 8 %$ (resulting in $N_{\rm eff} = 3.130$ the effective number of neutrino species), Higgs inflation, small and large scale structure formation, and current relic density of scalar dark matter ($X$). The electroweak vacuum of this model is stable up to Planck scale for $m_H = 125$ GeV without any other new physics. The Higgs signal strength is equal to one as in the standard model for unbroken $U(1)_X$ case with a scalar dark matter, but it could be less than one independent of decay channels if the dark matter is a dark sector fermion or if $U(1)_X$ is spontaneously broken, because of a mixing with a new neutral scalar boson in the models. Detailed study of Higgs properties at the LHC would shed light on the models described in this work.
description: 26 pages, 4 figures; Added references and corrected typos matching JHEP version
Abbildende, kumulative und distraktive Sätze in Caesars Bellum Gallicum. Fachwissenschaftliche und fachdidaktische Aspekte
Creators: name: Glücklich, Hans-Joachim
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2017

description: Anhand konkreter Beispielsätze aus Caesars Bellum Gallicum – genauer gesagt aus dem bellum Helveticum – zeigt Glücklich, dass es analog zur abbildenden Wortstellung auch abbildende Sätze gibt (natürlich auch bei anderen Autoren wie Cicero oder bei Dichtern). Viele Schwierigkeiten moderner Leser, insbesondere Schüler, erklären sich durch diesen Satzbau, der der gezielten Leserbeeinflussung dient. Wird er hingegen berücksichtigt, kann man Caesars Sprachkunst würdigen, seine Darstellungsabsicht erkennen und die Texte (vor oder statt einer Übersetzung) leichter erschließen, wobei auch das kolometrische Gliedern, verbunden mit der Interpretation, hilft.

 Es handelt sich um einen elektronischen Vorabdruck, dessen endgültige Fassung erscheinen wird in: Angela Hornung, Christian Jäkel, Werner Schubert (Hrsg.): Studia Humanitatis ac Litterarum Trifolio Heidelbergensi dedicata. Festschrift für Eckhard Christmann, Wilfried Edelmaier und Rudolf Kettemann, Frankfurt/M., Berlin, Bern, Bruxelles, New York, Oxford, Wien 2004 (Studien zur klassischen Philologie), S. 83-106.
description: Pegasus-Onlinezeitschrift, Bd. 3, Nr. 3 (2003): Pegasus-Onlinezeitschrift
Key predictors for climate policy support and political mobilization: The role of beliefs and preferences
Creators: name: Montfort, Simon
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Economics (econ.GN)
subject: FOS: Economics and business

description: Public support and political mobilization are two crucial factors for the adoption of ambitious climate policies in line with the international greenhouse gas reduction targets of the Paris Agreement. Despite their compound importance, they are mainly studied separately. Using a random forest machine-learning model, this article investigates the relative predictive power of key established explanations for public support and mobilization for climate policies. Predictive models may shape future research priorities and contribute to theoretical advancement by showing which predictors are the most and least important. The analysis is based on a pre-election conjoint survey experiment on the Swiss CO2 Act in 2021. Results indicate that beliefs (such as the perceived effectiveness of policies) and policy design preferences (such as for subsidies or tax-related policies) are the most important predictors while other established explanations, such as socio-demographics, issue salience (the relative importance of issues) or political variables (such as the party affiliation) have relatively weak predictive power. Thus, beliefs are an essential factor to consider in addition to explanations that emphasize issue salience and preferences driven by voters' cost-benefit considerations.
Quantum correlations in a noisy neutron interferometer
Creators: name: Wood, Christopher J.
name: Cory, David G.
name: Abutaleb, Mohamed O.
name: Huber, Michael G.
name: Arif, Muhammad
name: Pushin, Dmitry A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate quantum coherences in the presence of noise by entangling the spin and path degrees of freedom of the output neutron beam from a noisy three-blade perfect crystal neutron interferometer. We find that in the presence of dephasing noise on the path degree of freedom the entanglement of the output state reduces to zero, however the quantum discord remains non-zero for all noise values. Hence even in the presence of strong phase noise non-classical correlations persist between the spin and path of the neutron beam. This indicates that measurements performed on the spin of the neutron beam will induce a disturbance on the path state. We calculate the effect of the spin measurement by observing the changes in the observed contrast of the interferometer for an output beam post-selected on a given spin state. In doing so we demonstrate that these measurements allow us to implement a quantum eraser, and a which-way measurement of the path taken by the neutron through the interferometer. While strong phase noise removes the quantum eraser, the spin-filtered which-way measurement is robust to phase noise. We experimentally demonstrate this disturbance by comparing the contrasts of the output beam with and without spin measurements of three neutron interferometers with varying noise strengths. This demonstrates that even in the presence of noise that suppresses path coherence and spin-path entanglement, a neutron interferometer still exhibits uniquely quantum behaviour.
description: 10 pages, 5 figures. V3 includes expanded theoretical analysis and discussion of post-selected spin measurements in different bases
The Founders never intended the U.S. Postal Service to be managed like a business
Creators: name: John, Richard R.
Publisher: name: Columbia University
Year: 2020
Subjects: Postal service
History
Public administration

description: From the 1850s until the 1960s, Congress routinely covered whatever deficits the Postal Service incurred — no matter how large — and with little controversy, partisanship or debate. Why? Because the Postal Service was a public service, whose rationale was civic rather than commercial. As a New York journalist put it in 1854: The Postal Service’s “benefit to mankind” far outweighed the “pecuniary consideration” of any financial shortfall. In 1958, a federal law made this even clearer: The Postal Service was “clearly not a business enterprise conducted for profit.”
Sparse Factor Analysis for Learning and Content Analytics
Creators: name: Lan, Andrew S.
name: Waters, Andrew E.
name: Studer, Christoph
name: Baraniuk, Richard G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We develop a new model and algorithms for machine learning-based learning analytics, which estimate a learner's knowledge of the concepts underlying a domain, and content analytics, which estimate the relationships among a collection of questions and those concepts. Our model represents the probability that a learner provides the correct response to a question in terms of three factors: their understanding of a set of underlying concepts, the concepts involved in each question, and each question's intrinsic difficulty. We estimate these factors given the graded responses to a collection of questions. The underlying estimation problem is ill-posed in general, especially when only a subset of the questions are answered. The key observation that enables a well-posed solution is the fact that typical educational domains of interest involve only a small number of key concepts. Leveraging this observation, we develop both a bi-convex maximum-likelihood and a Bayesian solution to the resulting SPARse Factor Analysis (SPARFA) problem. We also incorporate user-defined tags on questions to facilitate the interpretability of the estimated factors. Experiments with synthetic and real-world data demonstrate the efficacy of our approach. Finally, we make a connection between SPARFA and noisy, binary-valued (1-bit) dictionary learning that is of independent interest.
Neutron Phase Contrast Imaging of PbWO$_{4}$ Crystals for G Experiment Test Masses Using a Talbot-Lau Neutron Interferometer
Creators: name: Assumin-Gyimah, K. T. A.
name: Dutta, D.
name: Hussey, D. S.
name: Snow, W. M.
name: Langlois, C.
name: Lee, V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Materials Science (cond-mat.mtrl-sci)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The use of transparent test/source masses can benefit future measurements of Newton's gravitational constant $G$. Such transparent test mass materials can enable nondestructive, quantitative internal density gradient measurements using optical interferometry and allow in-situ optical metrology methods to be realized for the critical distance measurements often needed in a $G$ apparatus. To confirm the sensitivity of such optical interferometry measurements to internal density gradients it is desirable to conduct a check with a totally independent technique. We present an upper bound on possible internal density gradients in lead tungstate (PbWO$_4$) crystals using a Talbot-Lau neutron interferometer on the Cold Neutron Imaging Facility (CNIF) at NIST. We placed an upper bound on a fractional atomic density gradient in two PbWO$_{4}$ test crystals of ${1 \over N}{dN \over dx}<0.5 \times 10^{-6}$ cm$^{-1}$. This value is about two orders of magnitude smaller than required for $G$ measurements. We discuss the implications of this result and of other nondestructive methods for characterization of internal density inhomogeneties which can be applied to test masses in $G$ experiments.
description: 10 pages, 8 figures, submitted to Classical and Quantum Gravity
Vergil und die Aeneis
Creators: name: Felgentreu, Fritz
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2017

description: T. S. Eliot geht in einem berühmten Aufsatz der Frage nach, was ein Klassiker sei, und kommt zu dem Ergebnis, dass in der europäischen Literatur allein Vergil dieses Prädikat zugesprochen werden kann. Er hält ihn für den einzigen und "absoluten Klassiker". Heute dagegen hat Vergil kaum mehr diese Bedeutung. Fritz Felgentreu (Berlin) spürt in seinem Beitrag Vergil und die Aeneis mögliche Gründe für diese Neubewertung auf und führt zugleich in die Welt der Aeneis Vergils ein.
description: Pegasus-Onlinezeitschrift, Bd. 4, Nr. 2 (2004): Pegasus-Onlinezeitschrift
Hokusai and the Blue Revolution in Edo Prints
Creators: name: Smith II, Henry D.
Publisher: name: Columbia University
Year: 2005
Subjects: Color prints, Japanese--Edo period
Prussian blue

description: This article introduces new evidence for the spread of the use of the pigment Prussian blue in Japanese woodblock prints (nishiki-e), in the form of a fan print by Keisai Eisen, dated to the year 1829, and now in collection of the Brooklyn Museum. I argue that this must be the fan print of a “Landscape of China” described in a miscellany titled Masaki no kazura by an Edo bookseller Seisōdō Tōho, which identified it as the first in a new genre of aizuri (“blue print”) in which the color blue is printed in several different shades of Prussian blue. Records of the trade in Prussian blue through Nagasaki by both Dutch and Chinese ships are introduced, showing a sudden and steady increase in the volume and drop in the price of the pigment relative to the Dutch product in the years 1824-28. The earlier history of the use of Prussian blue in Japan, both in paintings and prints, is traced, turning finally to its use by Hokusai in his celebrated “Thirty-Six View of Mount Fuji,” proposing that the use of all blue in the earliest prints of the series was directly inspired by the Eisen fan print, and help us to better understand the order in which they appeared. Finally, the various meanings of the color blue in late Tokugawa culture are discussed.
Ordered $*$-Semigroups and a $C^*$-Correspondence for a Partial Isometry
Creators: name: Brenken, Berndt
Publisher: name: arXiv
Year: 2013
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L05 46L08 20M30 06F05 46L55

description: Certain $*$-semigroups are associated with the universal $C^*$-algebra generated by a partial isometry, which is itself the universal $C^*$-algebra of a $*$-semigroup. A fundamental role for a $*$-structure on a semigroup is emphasized, and ordered and matricially ordered $*$-semigroups are introduced, along with their universal $C^*$-algebras. The universal $C^*$-algebra generated by a partial isometry is isomorphic to a relative Cuntz-Pimsner $C^*$-algebra of a $C^*$-correspondence over the $C^*$-algebra of a matricially ordered $*$-semigroup. One may view the $C^*$-algebra of a partial isometry as the crossed product algebra associated with a dynamical system defined by a complete order map modelled by a partial isometry acting on a matricially ordered $*$-semigroup.
title: Η ιδέα της 24-ωρης πόλης ως εργαλείο πολεοδομικού σχεδιασμού:
Χωρική προσέγγιση της νυχτερινής εμπειρίας στην Παλιά Πόλη του Ρεθύμνου

title: The idea of a 24-hour city as a planning tool:
A spatial approach of night-time experience in the Old Town of Rethymno
Creators: name: Νεονακη Μελπω
Publisher: name: Technical University of Crete
Year: 2019

description: Με τον όρο 24-ωρη πόλη αναφερόμαστε ουσιαστικά σε ένα τύπο περιβάλλοντος  όπου πολλαπλές λειτουργίες είναι διαθέσιμες ημέ-ρα και νύχτα, με σκοπό να εξυπηρετήσουν διαφορετικές ανάγκες, για διαφορετικές κοινωνικές ομάδες. Η ιδέα της 24-ωρης πόλης, αν και προέκυψε στο πλαίσιο αναζωογόνησης των πρώην βιομηχανι-κών περιοχών, δεν αποτελεί κάτι καινούριο για τις πόλεις, καθώς πολλές από αυτές παρουσίαζαν ήδη χαρακτηριστικά 24-ωρου περι-βάλλοντος. Οι ταχύτατες αλλαγές που συμβαίνουν σε όλες τις πτυ-χές της σύγχρονης κοινωνίας οδήγησαν στην ανάγκη δημιουργίας ενός πλαισίου που θα προσφέρει μία ολοκληρωμένη προσέγγιση του ζητήματος. Οι πτυχές αυτές, οικονομικές, κοινωνικο-πολιτισμικές και χωρικές-περιβαλλοντικές, λειτουργούν ως παρά-μετροι που επηρεάζουν την ύπαρξη και την ανάπτυξη μίας 24-ωρης πόλης. Εκτός από τις παραμέτρους που συμβάλλουν στη διαμόρ-φωση του πλαισίου της 24-ωρης πόλης, εξετάστηκαν και οι τύποι χωρικής οργάνωσης που αναγνωρίζονται, σύμφωνα με τα αποτελέ-σματα της έρευνας που πραγματοποιήθηκε για 12 πόλεις παγκο-σμίως, ενώ στη συνέχεια εξετάστηκαν οι πρακτικές της 24-ωρης πόλης που εφαρμόσθηκαν στην περιοχή της Μεγάλης Βρετανίας, καθώς εκεί στο πλαίσιο μιας ολοκληρωμένης και επιστημονικής προσέγγισης, συγκεντρώθηκαν σχετικές εθνικές και διεθνείς πρα-κτικές. Σε ότι αφορά τη νυχτερινή εμπειρία στην Παλιά Πόλη του Ρεθύμνου, η εργασία εξετάζει εάν και σε ποιο βαθμό η περιοχή παρουσιάζει χαρακτηριστικά  24-ωρης πόλης. Η Παλιά Πόλη αποτε-λεί σημαντικό πόλο έλξης για την πόλη του Ρεθύμνου τόσο την ημέρα, όσο και την νύχτα, καθώς φιλοξενεί μεγάλο μέρος των ε-μπορικών δραστηριοτήτων, ενώ ταυτόχρονα αποτελεί περιοχή ψυ-χαγωγίας για την πόλη, αυτός είναι και ο λόγος που επιλέχθηκε ως μελέτη περίπτωσης.