cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Bob Fass Aircheck
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Political activists
Hippies

description: A group of callers' conversation about Abbie Hoffman turns to personal insults. Bob interrupts by playing comedy sketch "The Hexorcist" (William Peter Blatty makes deal with the Devil) before phone conversation briefly resumes. "Go Tell the People" by Dr. John plays. Week of April 13, 1974: Lindsay Auden (?) in the studio reports news, mostly related to Nixon and government conspiracies. Tells of SUNY Purchase students' plan to visit Pepsi headquarters and CEO Ron Kendall on May Day. Bob closes show over unidentified psychedelic-rock song. Sound effect of eating chocolate chip cookies is played
Supporting farmers facing drought: lessons from a climate service in Jamaica
Creators: name: Furlow, John
name: Buizer, James
name: Mason, Simon J.
name: Brown, Glenroy
Publisher: name: Columbia University
Year: 2018
Subjects: Climatic changes
Climate change mitigation
Natural disasters--Planning
Droughts
Drought forecasting
Agriculture

description: In 2014, Jamaica entered one of the worst droughts in past 40 years. The drought was associated with the El Niño of 2014-15. Losses to agriculture and to farmers’ livelihoods were substantial, but not all farmers suffered equally. This chapter describes a seasonal drought forecast service that was developed by the Jamaican Meteorological Service (JMS) and the Rural and Agricultural Development Agency (RADA) to help farmers anticipate and prepare for drought. The service, which integrated new technical scientific information, interactive farmers’ forums, and various ways of communicating the information, grew directly out of Jamaica’s stakeholder-driven climate policy process. Jamaica’s success offers a useful example for how high-level planning, such as National Adaptation Plan processes and Nationally Determined Contributions can trigger actions that offer tangible benefits to vulnerable actors critical to sustaining key components of a country’s economy.
Tuning the static spin-stripe phase and superconductivity in La_(2-x)Ba_xCuO_4 (x = 1/8) by hydrostatic pressure
Creators: name: Guguchia, Z.
name: Maisuradze, A.
name: Ghambashidze, G.
name: Khasanov, R.
name: Shengelaya, A.
name: Keller, H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Magnetization and muon spin rotation experiments were performed in La_(2-x)Ba_xCuO_4 (x = 1/8) as a function of hydrostatic pressure up to p = 2.2 GPa. It was found that the magnetic volume fraction of the static stripe phase strongly decreases linearly with pressure, while the superconducting volume fraction increases by the same amount. This demonstrates competition between bulk superconductivity and static magnetic order in the stripe phase of La_1.875Ba_0.125CuO_4 and that these phenomena occur in mutually exclusive spatial regions. The present results also reveal that the static spin-stripe phase still exists at pressures, where the long-range low-temperature tetragonal (LTT) structure is completely suppressed. This indicates that the long-range LTT structure is not necessary for stabilizing the static spin order in La_1.875Ba_0.125CuO_4.
description: 12 pages, 4 figures
Quartz Tuning Forks and Acoustic Phenomena - Application to Superfluid Helium
Creators: name: Rysti, J.
name: Tuoriniemi, J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Immersed mechanical resonators are well suited for probing the properties of fluids, since the surrounding environment influences the resonant characteristics of such oscillators in several ways. Quartz tuning forks have gained much popularity in recent years as the resonators of choice for studies of liquid helium. They have many superior properties when compared to other oscillating bodies conventionally used for this purpose, such as vibrating wires. However, the intricate geometry of a tuning fork represents a challenge for analyzing their behavior in a fluid environment - analytical approaches do not carry very far. In this article the characteristics of immersed quartz tuning fork resonators are studied by numerical simulations. We account for the compressibility of the medium, that is acoustic phenomena, and neglect viscosity, with the aim to realisticallymodel the oscillator response in superfluid helium. The significance of different tuning fork shapes is studied. Acoustic emission in infinite medium and acoustic resonances in confined volumes are investigated. The results can aid in choosing a quartz tuning fork with suitable properties for experiments, as well as interpreting measured data.
description: 20 pages, 9 figures
title: Ανάπτυξη εργαστηριακών μεθοδολογιών δημιουργίας και χαρακτηρισμού πετρελαϊκών γαλακτωμάτων
Creators: name: Νταλακου Θεοδωρα
Publisher: name: Technical University of Crete
Year: 2017

description: Τα γαλακτώματα νερού σε πετρέλαιο σχηματίζονται σχεδόν σε όλες τις φάσεις της παραγωγής και επεξεργασίας πετρελαίου δημιουργώντας πολλά λειτουργικά προβλήματα ενώ η απομάκρυνση τους είναι εξαιρετικά δύσκολη. Επίσης, σχηματίζονται στις πετρελαιοκηλίδες όπου δυσκολεύουν  την αντιμετώπιση τους. Για τους λόγους αυτούς η μελέτη των γαλακτωμάτων και των τρόπων αντιμετώπιση τους είναι σημαντική για τη βιομηχανία του πετρελαίου.
Στην παρούσα διπλωματική εργασία αναπτύχθηκαν εργαστηριακές μεθοδολογίες δημιουργίας γαλακτωμάτων νερού σε πετρέλαιο και μελετήθηκαν οι ιδιότητες τους (πυκνότητα, περιεκτικότητα σε νερό, ιξώδες, σταθερότητα). Ιδιαίτερα διερευνήθηκε η σχέση ανάμεσα στις ιδιότητες αυτές και στην δυνατότητα αποσταθεροποίησης των γαλακτωμάτων. Για τον προγραμματισμό των εργαστηριακής δοκιμών χρησιμοποιήθηκε η τεχνική του πειραματικού σχεδιασμού. Με βάση τα πειραματικά δεδομένα αναπτύχθηκαν ποσοτικές σχέσεις που περιγράφουν την αλληλεξάρτηση των ιδιοτήτων των γαλακτωμάτων και την σχέση τους με την σταθερότητα τους.
To Tilt or Not To Tilt: Discrete Gauge Symmetries in Global Intersecting D-Brane Models
Creators: name: Honecker, Gabriele
name: Staessens, Wieland
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Discrete gauge symmetries in global intersecting D-brane models constrain the exact form of the perturbative as well as non-perturbative superpotential. We derive the complete set of conditions on the existence of discrete Zn gauge symmetries on toroidal orbifolds, T6/Z(N) and T6/Z(2)xZ(2M}, with fractional or rigid D6-branes on tilted tori, for which global models of particle physics are known. Several examples of global left-right symmetric and Pati-Salam models are presented. Some discrete `stringy' Zn symmetries are trivial from the field theory point of view, while others have not been identified before.
description: v2: sections 2.1.1+2.1.2, footnotes 10+11+12, refs added, minor additions+corrections to text, conclusions unchanged; v1: 1+47 pages
Gregor Maurach, Kleine Geschichte der antiken Komödie
Creators: name: Zimmermann, Bernhard
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Gregor Maurach, Kleine Geschichte der antiken Komödie, Darmstadt (Wissenschaftliche Buchgesellschaft) 2005, 160 S.
description: Forum Classicum, Nr. 1 (2006): Forum Classicum
Improved accuracy and reproducibility of coronary artery cal-cification features using deconvolution
Creators: name: Song, Yingnan
name: Hoori, Ammar
name: Wu, Hao
name: Vembar, Mani
name: Al-Kindi, Sadeer
name: Ciancibello, Leslie
name: Terry, James G.
name: Jacobs, David R.
name: Carr, John Jeffrey
name: Wilson, David L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Our long-range goal is to improve current whole-heart CT calcium score by extracting quantitative features from individual calcifications. We performed deconvolution to improve small calcifications assessment which challenge conventional CT calcium score scanning resolution. We analyzed features of individual calcifications on repeated standard (2.5-mm) and thin (1.25-mm) slice scans from QRM-Cardio phantom, cadaver hearts, and CARDIA study participants. Pre-processing to improve resolution involved of Lucy-Richardson deconvolution with a measured PSF or 3D blind deconvolution where the PSF was iteratively optimized on high detail structures like calcifications in the images. Using QRM with inserts having known mg-calcium, we determined that both blind and conventional deconvolution improved mass measurements nearly equally well on standard images. Further, de-convolved thin images gave excellent recovery of actual mass scores, suggesting that such processing could be our gold standard. For CARDIA images, blind deconvolution greatly improved results on standard slices. Accuracy across 33 calcifications (without, with deconvolution) was (23%,9%), (18%,1%), and (-19%,-1%), for Agatston, volume, and mass scores, respectively. Reproducibility was (0.13,0.10), (0.12,0.08), and (0.11,0.06), respectively. Mass scores were more reproducible than Agatston scores or vol-ume scores. Cadaver volumes showed similar improvements in accuracy/reproducibility and slightly better results with a measured PSF. For many other calcification features in CARDIA data, blind deconvolution improved reproducibility in 21 out of 24 features. Deconvolution improves accuracy and reproducibility of multiple features extracted from individual calcifications in CT calcium score exam. Blind deconvolution improves feature assessments of coronary calcification in archived datasets.
description: submitted to Journal of Medical Imaging
Divergence-Conforming Isogeometric Collocation Methods for the Incompressible Navier-Stokes Equations
Creators: name: Aronson, Ryan M.
name: Evans, John A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We develop two isogeometric divergence-conforming collocation schemes for incompressible flow. The first is based on the standard, velocity-pressure formulation of the Navier-Stokes equations, while the second is based on the rotational form and includes the vorticity as an unknown in addition to the velocity and pressure. We describe the process of discretizing each unknown using B-splines that conform to a discrete de Rham complex and collocating each governing equation at the Greville abcissae corresponding to each discrete space. Results on complex domains are obtained by mapping the equations back to a parametric domain using structure-preserving transformations. Numerical results show the promise of the method, including accelerated convergence rates of the three field, vorticity-velocity-pressure scheme when compared to the two field, velocity-pressure scheme.
A Neural-Network Framework for the Design of Individualised Hearing-Loss Compensation
Creators: name: Drakopoulos, Fotios
name: Verhulst, Sarah
Publisher: name: arXiv
Year: 2022
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Sound processing in the human auditory system is complex and highly non-linear, whereas hearing aids (HAs) still rely on simplified descriptions of auditory processing or hearing loss to restore hearing. Even though standard HA amplification strategies succeed in restoring audibility of faint sounds, they still fall short of providing targeted treatments for complex sensorineural deficits and adverse listening conditions. These shortcomings of current HA devices demonstrate the need for advanced hearing-loss compensation strategies that can effectively leverage the non-linear character of the auditory system. Here, we propose a differentiable deep-neural-network (DNN) framework that can be used to train DNN-based HA models based on biophysical auditory-processing differences between normal-hearing and hearing-impaired systems. We investigate different loss functions to accurately compensate for impairments that include outer-hair-cell (OHC) loss and cochlear synaptopathy (CS), and evaluate the benefits of our trained DNN-based HA models for speech processing in quiet and in noise. Our results show that auditory-processing enhancement was possible for all considered hearing-loss cases, with OHC loss proving easier to compensate than CS. Several objective metrics were considered to estimate the expected speech intelligibility after processing, and these simulations hold promise in yielding improved understanding of speech-in-noise for hearing-impaired listeners who use our DNN-based HA processing. Since our framework can be tuned to the hearing-loss profiles of individual listeners, we enter an era where truly individualised and DNN-based hearing-restoration strategies can be developed and be tested experimentally.
An estimation of the effective number of electrons contributing to the coordinate measurement with a TPC II
Creators: name: Kobayashi, Makoto
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: For time projection chambers (TPCs) the accuracy in measurement of the track coordinates along the pad-row direction deteriorates with the drift distance (z): Resolution**2 = D**2 * z / N_eff, where D is the diffusion constant and N_eff is the effective number of electrons. Experimentally it has been shown that N_eff is smaller than the average number of drift electrons per pad row (). In the previous work we estimated N_eff by means of a simple numerical simulation for argon-based gas mixtures, taking into account the diffusion of electrons only in the pad-row direction [1]. The simulation showed that N_eff could be as small as 30% of because of the combined effect of statistical fluctuations in the number of drift electrons (N) and in their multiplication in avalanches. In this paper, we evaluate the influence of the diffusion normal to the pad-row direction on the effective number of electrons. The de-clustering of the drift electrons due to the diffusion makes N_eff drift-distance dependent. However, its effect was found to be too small to explain the discrepancy between the values of N_eff measured with two TPC prototypes different in size.
description: 12 pages, LaTeX; minor corrections to the equation in Section 2 made, results unchanged
Distortion of neutrino oscillations by dark photon dark matter
Creators: name: Alonso-Álvarez, Gonzalo
name: Bleau, Katarina
name: Cline, James M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A weakly coupled and light dark photon coupling to lepton charges $L_μ-L_τ$ is an intriguing dark matter candidate whose coherent oscillations alter the dispersion relations of leptons. We study how this effect modifies the dynamics of neutrino flavor conversions, focusing on long baseline and solar oscillations. We analyze data from the T2K, SNO, and Super-Kamiokande experiments in order to obtain world-leading limits on the dark photon gauge coupling for masses below $\sim 10^{-11}\,\mathrm{eV}$. Degeneracies between shifts in the neutrino mass-squared differences and mixing angles and the new physics effect significantly relax the current constrains on the neutrino vacuum oscillation parameters.
description: 10 pages, 8 figures
title: Προσομοίωση σεισμικών δεδομένων για την απεικόνιση γεωλογικών σχηματισμών σε υπόγειες σήραγγες
Creators: name: Παπαδοπουλος-Μενιδιατης Χαραλαμπος
Publisher: name: Technical University of Crete
Year: 2017

description: Το κύριο αντικείμενο της διπλωματικής εργασίας αυτής, είναι η ανάπτυξη μεθοδολογίας έγκαιρου εντοπισμού ρήγματος ή διαφοροποίησης του σχηματισμού διάτρησης σήραγγας με χρήση σεισμικών δεδομένων. Για την προσέγγιση του προβλήματος αυτού μελετήθηκε η πρόσφατη βιβλιογραφία και πραγματοποιήθηκε προσομοίωση της διάδοσης σεισμικών κυμάτων σε μοντέλα όπου η σεισμική πηγή και τα γεώφωνα τοποθετούνται στα τοιχώματα της σήραγγας.
Ειδικότερα, στα αρχικά στάδια της εργασίας δημιουργήθηκαν συνθετικά μοντέλα στις δύο διαστάσεις. Ένα μοντέλο με τον ανακλαστήρα να απέχει 100mαπό το μέτωπο της σήραγγας και ένα δεύτερο με τον ανακλαστήρα να απέχει 80m. Η σεισμική πηγή τοποθετήθηκε στο μέτωπο της σήραγγας ενώ οι δέκτες κατά μήκος αυτής. Λόγω της πολυπλοκότητας των συνθετικών καταγραφών εξαιτίας της σήραγγας, πραγματοποιήθηκαν δοκιμές χωρίς να υπάρχει το σώμα της σήραγγας στο μοντέλο. Με αυτόν τον τρόπο ήταν ευκολότερη η αναγνώριση των σεισμικών κυμάτων και η περαιτέρω επεξεργασία τους. Στα συνθετικά σεισμικά δεδομένα εφαρμόστηκε μετασχηματισμός αντίστοιχος με τη διόρθωση της κανονικής χρονικής απόκλισης που εφαρμόζεται στη μέθοδο της σεισμικής ανάκλασης. Ο μετασχηματισμός αυτός μετατρέπει τον χρόνο διαδρομής σε διπλό χρόνο ανάκλασης από το μέτωπο της σήραγγας μέχρι τον ανακλαστήρα και δημιουργεί σεισμική τομή. Το τελικό στάδιο της επεξεργασίας περιλαμβάνει την εφαρμογή φίλτρου ενδιάμεσης τιμής (medianfilter) στα μετασχηματισμένα δεδομένα, το οποίο ανέδειξε τα ανακλώμενα διαμήκη κύματα, ενώ παράλληλα εξασθένισε τα άλλα είδη κυμάτων.
Η απομόνωση των ανακλώμενων κυμάτων στα πειράματα χωρίς τη σήραγγα ήταν ιδεατή, κάτι που βοήθησε και στην αναγνώριση των αντίστοιχων ανακλώμενων κυμάτων στα πιο σύνθετα δεδομένα από τα μοντέλα με τη σήραγγα.
Bilipschitz and quasiconformal rotation, stretching and multifractal spectra
Creators: name: Astala, Kari
name: Iwaniec, Tadeusz
name: Prause, István
name: Saksman, Eero
Publisher: name: arXiv
Year: 2013
Subjects: subject: Complex Variables (math.CV)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: We establish sharp bounds for simultaneous local rotation and Hölder-distortion of planar quasiconformal maps. In addition, we give sharp estimates for the corresponding joint quasiconformal multifractal spectrum, based on new estimates for Burkholder functionals with complex parameters. As a consequence, we obtain optimal rotation estimates also for bi-Lipschitz maps.
description: Corrected typos, minor edits
Social vulnerability to floods in two coastal megacities: New York City and Mumbai
Creators: name: De Sherbinin, Alexander M.
name: Bardy, Guillem
Publisher: name: Columbia University
Year: 2016
Subjects: Floods
Poor
Emergency management--Data processing
Emergency management--Planning
Spatial analysis (Statistics)

description: In this paper we assess differential exposure to flooding in two coastal megacities, New York and Mumbai, both of which suffered major flood-related disasters in the past decade. Specifically, we examine whether the most exposed populations are also the most socially vulnerable. First, we developed Social Vulnerability Indices (SoVIs) for each city with census data. We then overlaid the SoVI scores onto flood extent maps for Hurricane Sandy (New York, October 2012) and the Mumbai flash floods (July 2005), as well as for the evacuation zones for New York, to examine patterns of differential exposure. Our results suggest a degree of differential exposure in New York, especially in the highest flood risk areas, and provide fairly clear evidence for differential exposure in Mumbai. However, differences in the input resolution and confidence in the datasets for Mumbai make the results more uncertain. The paper concludes with a discussion of the policy implications and the data needs for urban spatial vulnerability assessments.
Interplay between ω-Nucleon Interaction and Nucleon Mass in Dense Baryonic Matter
Creators: name: Paeng, Won-Gi
name: Lee, Hyun Kyu
name: Rho, Mannque
name: Sasaki, Chihiro
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The dilaton-limit fixed point and the scaling properties of hadrons in the close vicinity of the fixed point in dense baryonic matter uncovered in hidden local symmetry implemented with spontaneously broken scale symmetry are shown to reveal a surprisingly intricate interplay, hitherto unsuspected, between the origin of the bulk of proton mass and the renormalization-group flow of the ω-nuclear interactions. This rends a theoretical support to the previous (phenomenologically) observed correlation between the dropping nucleon mass and the behavior of the ω-nuclear interactions in dense matter described in terms of half skyrmions that appear at a density denoted $n_{1/2}$ in skyrmion crystals. The role of the ω-meson degree of freedom in the source for nucleon mass observed in this paper is highly reminiscent of its important role in the skyrmion description of nucleon mass in hidden local symmetric theory. One of the most notable novel results found in this paper is that the nucleon mass in dense baryonic medium undergoes a drop roughly linear in density up to a density (denoted $\tilde{n}$) slightly above nuclear matter density ($n_0$) and then stays more or less constant up to the dilaton limit fixed point. The possibility that we entertain is that $\tilde{n}$ coincides with or at least close to $n_{1/2}$. We note that this feature can be economically captured by the parity-doublet model for nucleons with the chiral-invariant mass $m_0\sim (0.7-0.8) m_N$. It is found in one-loop renormalization-group analysis with the Lagrangian adopted that while the ρ-NN coupling "runs" in density, the ω-NN coupling does not scale: it will scale at two-loop or higher-loop order, but at a slower pace, so it is more appropriate to say it "walks" rather than runs.
description: 29 paeges, 3 figures. Revised for publication
Stable Invariant Models via Koopman Spectra
Creators: name: Konishi, Takuya
name: Kawahara, Yoshinobu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Weight-tied models have attracted attention in the modern development of neural networks. The deep equilibrium model (DEQ) represents infinitely deep neural networks with weight-tying, and recent studies have shown the potential of this type of approach. DEQs are needed to iteratively solve root-finding problems in training and are built on the assumption that the underlying dynamics determined by the models converge to a fixed point. In this paper, we present the stable invariant model (SIM), a new class of deep models that in principle approximates DEQs under stability and extends the dynamics to more general ones converging to an invariant set (not restricted in a fixed point). The key ingredient in deriving SIMs is a representation of the dynamics with the spectra of the Koopman and Perron--Frobenius operators. This perspective approximately reveals stable dynamics with DEQs and then derives two variants of SIMs. We also propose an implementation of SIMs that can be learned in the same way as feedforward models. We illustrate the empirical performance of SIMs with experiments and demonstrate that SIMs achieve comparative or superior performance against DEQs in several learning tasks.
Performance of recalibration systems for GCM forecasts for southern Africa
Creators: name: Shongwe, Mxolisi
name: Landman, Willem
name: Mason, Simon J.
Publisher: name: Columbia University
Year: 2006
Subjects: Climatic changes
Climatic changes--Models
Climatic changes--Statistical methods
Long-range weather forecasting
Atmospheric circulation--Models

description: Two regression-based methods that recalibrate the ECHAM4.5 general circulation model (GCM) output during austral summer have been developed for southern Africa, and their performance assessed over a 12-year retroactive period 1989/90–2000/01. A linear statistical model linking near-global sea-surface temperatures (SSTs) to regional rainfall has also been developed. The recalibration technique is model output statistics (MOS) using principal components regression (PCR) and canonical correlation analysis (CCA) to statistically link archived records of the GCM to regional rainfall over much of Africa, south of the equator. The predictability of anomalously dry and wet conditions over each rainfall region during December–February (DJF) using the linear statistical model and MOS models has been quantitatively evaluated. The MOS technique outperforms the raw-GCM ensembles and the linear statistical model. Neither the PCR-MOS nor the CCA-MOS models show clear superiority over the other, probably because the two methods are closely related. The need to recalibrate GCM predictions at regional scales to improve their skill at smaller spatial scales is further demonstrated in this paper.
title: Χαρακτηρισμός και συντήρηση κονιαμάτων: εφαρμογή στο Φιρκά Χανίων
Creators: name: Ξενιδη Αναστασια
Publisher: name: Technical University of Crete
Year: 2017

description: Η παρούσα διπλωματική εργασία επικεντρώνεται στην ανάλυση κονιαμάτων, επιχρισμάτων και λίθων του Τείχους του Φρουρίου Φιρκά και του Γενοβέζικου Πύργου. Κύριος στόχος της εργασίας είναι η διευκρίνιση της τεχνολογίας παρασκευής και φύσης των υλικών αυτών, καθώς και η συντήρηση τόσο των συγκεκριμένων υλικών όσο και μεταγενέστερων επεμβάσεων. Η πλήρης αποτύπωση της τεχνολογίας παρασκευής των κονιαμάτων – επιχρισμάτων μέσω της ολιστικής ανάλυσης (φυσικοχημική/μηχανική) των υφιστάμενων υλικών, συνέβαλλε στο να προταθεί συμβατό κονίαμα – επίχρισμα αποκατάστασης με τα επιθυμητά αποτελέσματα το οποίο όμως δεν αποτελεί τμήμα της παρούσας διπλωματικής εργασίας.
Η συστηματική αυτή μελέτη συμβάλλει στην συντήρηση του μνημείου και η ολοκλήρωσή της πραγματοποιήθηκε με την ουσιαστική συλλογή δειγμάτων από το μνημείο (Φρούριο Φιρκά και Γενοβέζικο Πύργο) τα οποία παρουσίαζαν διαφορετικούς βαθμούς διάβρωσης. Στη συνέχεια, επιλέχθηκαν τα πιο χαρακτηρίστηκα δείγματα και αναλύθηκαν με χημική και ορυκτολογική ανάλυση όπου διαπιστώθηκε η φύση της κονίας και των αδρανών, προσδιορίστηκαν τα ιχνοστοιχεία για το κάθε δείγμα καθώς επίσης και οι δείκτες υδραυλικότητάς τους. Για περαιτέρω διερεύνηση, πραγματοποιήθηκε μικροσκοπικός και μακροσκοπικός χαρακτηρισμός των κονιαμάτων-επιχρισμάτων, με στόχο τον χαρακτηρισμό της μικροδομής τους, καθώς επίσης και κοκκομετρική διαβάθμιση των αδρανών συστατικών τους.
Τέλος, με σκοπό την συντήρηση τόσο του μνημείου όσο και των προτεινόμενων κονιαμάτων και επιχρισμάτων που συντέθηκαν, πραγματοποιήθηκαν στο Εργαστήριο Υλικών Πολιτιστικής Κληρονομιάς & Σύγχρονης Δόμησης εφαρμογές καινοτόμων στερεωτικών νάνο-υλικών σε Ασβεστοκονιάματα και δοκίμια Αλφά και μελετήθηκε η συμπεριφορά τους τόσο με τον έλεγχο της ανθεκτικότητας σε άλατα θειικού νατρίου όσο και με τον έλεγχο διαπερατότητας σε υδρατμούς.
Συμπερασματικά, η ανάλυση και ο χαρακτηρισμός των ιστορικών κονιαμάτων του Φιρκά, ειδικά μετά από την ομαδοποίηση τους, συνετέλεσε στο να διευκρινιστούν οι κατασκευαστικές φάσεις του Φρουρίου και να προταθούν κατάλληλα κονιάματα συντήρησης.
title: Συμβολή της γεωηλεκτρικής τομογραφίας στην απεικόνιση σπηλαιώσεων
Creators: name: Μαυρης Μαριος
Publisher: name: Technical University of Crete
Year: 2017

description: Η παρούσα διπλωματική εργασία πραγματεύεται την επεξεργασία και την ερμηνεία γεωηλεκτρικών δεδομένων για τον εντοπισμό καρστικών εγκοίλων στις θέσεις επέκτασης του κτιρίου του Κρατικού Αερολιμένα Χανίων. Η γεωφυσική έρευνα έγινε με την μέθοδο της ηλεκτρικής τομογραφίας.
Για να γίνει καλύτερη ερμηνεία των αποτελεσμάτων, δημιουργήθηκαν συνθετικά δεδομένα χρησιμοποιώντας τα λογισμικά πακέτα RES2DMOD και RES3DMOD. Στα πλαίσια της παρούσας διπλωματικής εργασίας, πραγματοποιήθηκε επεξεργασία των συνθετικών γεωηλεκτρικών δεδομένων στις δύο διαστάσεις με το λογισμικό RES2DINV και στις τρεις διαστάσεις με με το RES3DINV. Επιλέχθηκαν οι διατάξεις των ηλεκτροδίων διπόλου-διπόλου, πόλου-διπόλου και Wenner-Schlumberger. Ειδικότερα, χρησιμοποιήθηκαν δύο μέθοδοι αντιστροφής δεδομένων (Least-Squares Inversion, Robust Inversion).
Στην συνέχεια επιλέχθηκαν πραγματικά δεδομένα από τμήμα της περιοχής επέκτασης του κτιρίου του Κρατικού Αερολιμένα Χανίων. Τα δεδομένα επεξεργάστηκαν με την χρήση κατάλληλων λογισμικών αλλά και μεθόδων αντιστροφής στις δύο και τρεις διαστάσεις. Δημιουργήθηκαν γεωηλεκτρικές τομές και έγινε σύγκριση των τομών με γεωτριτικά δεδομένα για την βαθμονόμηση των αποτελεσμάτων.
Στις τομές εμφανίζονται δομές  υψηλής ειδικής ηλεκτρικής αντίστασης οι οποίες σύμφωνα και με τα γεωτρητικά στοιχεία αποδίδοται σε μικρού μεγέθους έγκοιλα τα οποία ελήφθησαν υπόψην κατά τη θεμελίωση των νέων κτιρίων του Κρατικού Αερολιμένα Χανίων.
Realization of multiple charge density waves in NbTe2 at the monolayer limit
Creators: name: Bai, Yusong
name: Pan, Zemin
name: Deng, Jinghao
name: Lin, Xiaoyu
name: Jian, Tao
name: Zhu, Chao
name: Huo, Da
name: Cheng, Zhengbo
name: Cui, Ping
name: Zhang, Zhenyu
name: Zou, Qiang
name: Zhang, Chendong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Abstract: Layered transition-metal dichalcogenides (TMDCs) down to the monolayer (ML) limit provide a fertile platform for exploring charge-density waves (CDWs). Though bulk NbTe2 is known to harbor a single axis 3*1 CDW coexisting with non-trivial quantum properties, the scenario in the ML limit is still experimentally unknown. In this study, we unveil the richness of the CDW phases in ML NbTe2, where not only the theoretically predicted 4*4 and 4*1 phases, but also two unexpected sqrt(28)*sqrt(28) and sqrt(19)*sqrt(19) phases, can be realized. For such a complex CDW system, we establish an exhaustive growth phase diagram via systematic efforts in the material synthesis and scanning tunneling microscope characterization. Moreover, we report that the energetically stable phase is the larger scale order (sqrt(19)*sqrt(19)), which is surprisingly in contradiction to the prior prediction (4*4). These findings are confirmed using two different kinetic pathways, i.e., direct growth at proper growth temperatures (T), and low-T growth followed by high-T annealing. Our results provide a comprehensive diagram of the "zoo" of CDW orders in ML 1T-NbTe2 for the first time and offer a new material platform for studying novel quantum phases in the 2D limit.
Im ,Zeichen der Zeit‘ - oder die Stunde der charismatischen Führer (Teil 2). Die catilinarische Verschwörung als Ausdruck einer immanenten Systemkrise der Römischen Republik
Creators: name: Brüggemann, Jens
name: Ilgen, Matthias
Publisher: name: Forum Classicum
Year: 2017

description: -
description: Forum Classicum, Nr. 3 (2006): Forum Classicum
Experimental verification of the temperature coefficient of resistivity
Creators: name: Polak, Robert D.
name: Harris, Michael R.
name: Nguyen, Kiet A.
name: Kearns, Anthony
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: We have created an experimental procedure for determining the temperature coefficient of resistivity, $α_R$, for introductory physics laboratories. This method examines the relationship between temperature and resistivity to establish $α_R$ within 10% of the accepted value.
Judith Steiniger: P. Papinius Statius, Thebais Kommentar zu Buch 4, 1-344
Creators: name: Berner, Hans-Ulrich
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Judith Steiniger: P. Papinius Statius, Thebais Kommentar zu Buch 4, 1-344. Stuttgart Franz Steiner Verlag 2005, 181 Seiten (Altertumswisseschaftliches Kolloquium, Band 14), (ISBN 3-515-08683-8).
description: Forum Classicum, Nr. 3 (2006): Forum Classicum
The number of accessible paths in the hypercube
Creators: name: Berestycki, Julien
name: Brunet, Éric
name: Shi, Zhan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Mathematics
subject: FOS: Biological sciences

description: Motivated by an evolutionary biology question, we study the following problem: we consider the hypercube $\{0,1\}^L$ where each node carries an independent random variable uniformly distributed on $[0,1]$, except $(1,1,\ldots,1)$ which carries the value $1$ and $(0,0,\ldots,0)$ which carries the value $x\in[0,1]$. We study the number $Θ$ of paths from vertex $(0,0,\ldots,0)$ to the opposite vertex $(1,1,\ldots,1)$ along which the values on the nodes form an increasing sequence. We show that if the value on $(0,0,\ldots,0)$ is set to $x=X/L$ then $Θ/L$ converges in law as $L\to\infty$ to $\mathrm{e}^{-X}$ times the product of two standard independent exponential variables. As a first step in the analysis, we study the same question when the graph is that of a tree where the root has arity $L$, each node at level 1 has arity $L-1$, \ldots, and the nodes at level $L-1$ have only one offspring which are the leaves of the tree (all the leaves are assigned the value 1, the root the value $x\in[0,1]$).
description: Published at http://dx.doi.org/10.3150/14-BEJ641 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Duden. Fremdwörterbuch
Creators: name: Werner, Jürgen
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Duden. Fremdwörterbuch, 8., neubearb. und erweit. Aufl. (Duden Bd. 5). 2005. 1104 S. (ISBN 3-411-04058-0). Duden. Universalwörterbuch, 5., überarb. Aufl. 2003. 1892 S. (ISBN 3-411-05505- 7). Beide: Dudenverlag Mannheim usw.
description: Forum Classicum, Nr. 3 (2006): Forum Classicum
title: Water-in-oil emulsion treatment of crude oil effluent: techniques, additives and simulation
Creators: name: Σαββιδου Δεσποινα
Publisher: name: Technical University of Crete
Year: 2017

description: Emulsions  can  be  found  in  almost  every  part  of  the petroleum production  and  recovery  process:  in reservoirs, produced at the wellheads, in themrefining processesmand in transportation pipelines. The presence and nature of emulsions define the technical way for their treatment. The mechanisms for emulsion   destabilization   are flocculation,   creaming,   sedimentation,   coalescence   and Ostwald ripening. The separation of an emulsion can be achieved with any combination of methods such as: use of
chemical  demulsifiers (chemical  treatment),  increase  of  temperature  (thermal  treatment), apply of electrostatic fields (electrical treatment) or use
vessels with high residence time (mechanical treatment).
This  work  intends  to  provide an analytical  description  of  the  variety of the
separation  mechanisms, including innovative   techniques   such   as the   oscillatory   mixing,   the   microwave   radiation,   the sonication, the ultrasonic treatment and the electrostatic method.
An  important  part of  this  work was  to  research  and  collect  data  about  recent  commercial  chemical demulsifiers. The  components  of  the
demulsifiers  such  as  droppers,  treaters,  desalters  and  wetting
agents and their purpose of use are described in details. Methods such as the SAD method, the HLB value  are  presented  and  especially  the  RSN  value  is used  widely  in  the  literature.  The  procedure of acquiring  representative  samples  for  specific  tests  like  the  bottle  test  is  also  described  in  order  to provide  information  about  the  effectiveness  of  the  treatment  chemicals  on  the  separation  of  the emulsions. There  are  demulsifiers  for  strict  environmental  restrictions,  or  treating  light  oils,  heavy oils, working well at low temperatures or in low or high water cuts. The activity, the solubility and the RSN  value  is  given  for  the  majority  of  the  presented  demulsifiers.  However,  most  companies  can produce tailor-made demulsifiers based on customer’s specifications and performance requirements.
The  last  part of  this  work  refers briefly to  the emulsion simulations and  the  difficulty  to  have consistency between the simulations results and the experimental data. A large number of articles is published  worldwide  for  the  development  of the  simulation models.  The  simulation  task  is  still  a
subject of state-of-the-art research.
Inevitable manifestation of wiggles in the expansion of the late Universe
Creators: name: Akarsu, Ozgur
name: Colgain, Eoin O.
name: Ozulker, Emre
name: Thakur, Somyadip
name: Yin, Lu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using the fact that the comoving angular diameter distance to the last scattering surface is strictly constrained almost model independently, we show that, for any model agreeing with the standard $Λ$CDM model on its background dynamics at $z\sim0$ and size of the comoving sound horizon at last scattering, the deviations of the Hubble radius from the one of the standard $Λ$CDM model must be a member of the set of admissible wavelets. The family of models characterized by this framework also offers nontrivial oscillatory behaviours in various functions that define the kinematics of the Universe, even when the wavelets themselves are very simple. We also discuss the consequences of attributing these kinematics to, first, dark energy, and second, varying gravitational coupling strength. Utilizing some simplest wavelets, we demonstrate the competence of this framework in describing the baryon acoustic oscillation (BAO) data without any modifications to the agreement with cosmic microwave background measurements. This framework also provides a natural explanation for the bumps found in nonparametric observational reconstructions of the Hubble parameter and dark energy density as compensations of the dips suggested by some BAO data, and questions the physical reality of their existence. We note that utilizing this framework on top of the models that agree with both the cosmic microwave background and local $H_0$ measurements but are held back by BAO data, one may resurrect these models through the wiggly nature of wavelets that can naturally accommodate the BAO data. Finally, we also suggest narrowing the plausible set of admissible wavelets to further improve our framework by imposing conditions from expected kinematics of a viable cosmological model or first principle fundamental physics such as energy conditions.
description: 16 pages, 4 figures; matches the version published in Physical Review D
Why the observed spin evolution of older-than-solar like stars might not require a dynamo mode change
Creators: name: Kotorashvili, Ketevan
name: Blackman, Eric G.
name: Owen, James E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The spin evolution of main sequence stars has long been of interest for basic stellar evolution, stellar aging, stellar activity, and consequent influence on companion planets. Observations of older than solar late-type main-sequence stars have been interpreted to imply that a change from a dipole-dominated magnetic field to one with more prominent higher multipoles might be necessary to account for the data. The spin-down models that lead to this inference are essentially tuned to the sun. Here we take a different approach which considers individual stars as fixed points rather than just the Sun. We use a time-dependent theoretical model to solve for the spin evolution of low-mass main-sequence stars that includes a Parker-type wind and a time-evolving magnetic field coupled to the spin. Because the wind is exponentially sensitive to the stellar mass over radius and the coronal base temperature, the use of each observed star as a separate fixed point is more appropriate and, in turn, produces a set of solution curves that produces a solution envelope rather than a simple line. This envelope of solution curves, unlike a single line fit, is consistent with the data and does not unambiguously require a modal transition in the magnetic field to explain it.
description: 8 pages, 4 figures; Accepted for publication in MNRAS
On the completeness of trajectories for some mechanical systems
Creators: name: Sánchez, Miguel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The classical tools which ensure the completeness of vector fields and second order differential equations for mechanical systems are revisited. Possible extensions in three directions are discussed: infinite dimensional Banach and Hilbert manifolds, Finsler metrics and pseudo-Riemannian spaces, including links with some relativistic spacetimes. Special emphasis is taken in the cleaning up of known techniques, the statement of open questions and the exploration of prospective frameworks.
description: Five new references included, plus some discussions and minor corrections; 28 pages, 2 figures. To appear in "Geometric Mechanics: The Legacy of Jerry Marsden", Fields Institute Communications Series
Arno Schmidt: Das Elend des Logos - Antike Philosophie nach Aristoteles - mit Radierungen von Ernst Marow
Creators: name: Gieseking, Kurt
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Arno Schmidt: Das Elend des Logos - Antike Philosophie nach Aristoteles - mit Radierungen von Ernst Marow. Berlin: Logos Verlag 2005, 259 S., (ISBN 3-8325-1007-9)
description: Forum Classicum, Nr. 4 (2006): Forum Classicum
Phonon-assisted optical absorption of SiC polytypes from first principles
Creators: name: Zhang, Xiao
name: Kioupakis, Emmanouil
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Silicon carbide (SiC) is an indirect-gap semiconductor material widely used in electronic and optoelectronic applications. While experimental measurements of the phonon-assisted absorption coefficient of SiC across its indirect gap have existed for more than fifty years, theoretical investigations of phonon-assisted absorption have been hampered by their excessive computational cost. In this work, we calculate the phonon-assisted temperature-dependent optical absorption spectra of the commonly occurring SiC polytypes (3C, 2H, 4H and 6H), using first-principles approaches based on density functional theory and related techniques. We show that our results agree with experimentally determined absorption coefficients in the spectral region between the direct and indirect band gaps. The temperature dependence of the spectra can be well-predicted with taking the temperature-dependence of the band gaps into account. Lastly, we compare the spectra obtained with second-order perturbation theory to those determined by the special displacement method, and we show that the full consideration of the electronic energy renormalization due to temperature is important to further improve the prediction of the phonon-assisted absorption in SiC. Our insights can be applied to predict the optical spectra of the less common SiC polytypes and other indirect-gap semiconductors in general.
description: 13 pages, 9 figures
Time-dependent exchange-correlation hole and potential of the electron gas
Creators: name: Karlsson, K.
name: Aryasetiawan, F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The exchange-correlation hole and potential of the homogeneous electron gas have been investigated within the random-phase approximation, employing the plasmon-pole approximation for the linear density response function. The angular dependence as well as the time dependence of the exchange-correlation hole are illustrated for a Wigner-Seitz radius $r_s=4$ (atomic unit). It is found that there is a substantial cancellation between exchange and correlation potentials in space and time, analogous to the cancellation of exchange and correlation self-energies. Analysis of the sum rule explains why it is more advantageous to use a non-interacting Green function than a renormalized one when calculating the response function within the random-phase approximation and consequently the self-energy within the well-established $GW$ approximation. The present study provides a starting point for more accurate and comprehensive calculations of the exchange-correlation hole and potential of the electron gas with the aim of constructing a model based on the local density approximation as in density functional theory.
description: 19 pages, 15 figures
Christian Danz (Hrsg): Grosse Theologen
Creators: name: Schmitz, Dietmar
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Christian Danz (Hrsg): Grosse Theologen. Darmstadt:
Wissenschaftliche Buchgesellschaft 2006. 320 S. (ISBN-10:3-534-19518-3; ISBN-13: 978-3-534-19518-3)
description: Forum Classicum, Nr. 4 (2006): Forum Classicum
Mapping the Future: Policy Applications of Climate Vulnerability Mapping in West Africa
Creators: name: De Sherbinin, Alexander M.
name: Apotsos, Alex
name: Chevrier, Jeremy
Publisher: name: Columbia University
Year: 2017
Subjects: Climatic changes
Climatic changes--Decision making
Climatic changes--Government policy
Maps
Spatial analysis (Statistics)

description: We describe the development of climate vulnerability maps for three Sahelian countries – Mali, Burkina Faso, and Niger – and for coastal West Africa, with a focus on the way the maps were designed to meet decision-making needs and their ultimate influence and use in policy contexts. The paper provides a review of the literature on indicators and maps in the science-policy interface. We then assess the credibility, salience, and legitimacy of the maps as tools for decision-making. Results suggest that vulnerability maps are a useful boundary object for generating discussions among stakeholders with different objectives and technical backgrounds, and that they can provide useful input for targeting development assistance. We conclude with a discussion of the power of maps to capture policy maker attention, and how this increases the onus on map developers to communicate clearly uncertainties and limitations. The assessment of policy uptake in this paper is admittedly subjective; the article includes a discussion of ways to conduct more objective and rigorous assessments of policy impact so as to better evaluate the value and use of vulnerability mapping in decision-making processes.
On the Cauchy problem for backward stochastic partial differential equations in Hölder spaces
Creators: name: Tang, Shanjian
name: Wei, Wenning
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: This paper is concerned with solution in Hölder spaces of the Cauchy problem for linear and semi-linear backward stochastic partial differential equations (BSPDEs) of super-parabolic type. The pair of unknown variables are viewed as deterministic spatial functionals which take values in Banach spaces of random (vector) processes. We define suitable functional Hölder spaces for them and give some inequalities among these Hölder norms. The existence, uniqueness as well as the regularity of solutions are proved for BSPDEs, which contain new assertions even on deterministic PDEs.
description: Published at http://dx.doi.org/10.1214/14-AOP976 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
title: Μελέτη της σύστασης και των ιδιοτήτων του περλίτη των περιοχών Χιβαδολίμνης-Προβατα-Τσιγκαράδου της Μήλου
Creators: name: Λουκιανού Καλλιόπη
Publisher: name: Technical University of Crete
Year: 1993

description: Μη διαθέσιμο