cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
$^{18}$O$/^{17}$O abundance ratio toward a sample of massive star forming regions with parallax distances
Creators: name: Ou, Chao
name: Wang, Junzhi
name: Zheng, Siqi
name: Li, Juan
name: Romano, Donatella
name: Zhang, Zhi-Yu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The $^{18}$O$/^{17}$O abundance ratio is, in principle, a powerful tool to estimate the relative contributions of massive stars and low- to intermediate-mass stars to the chemical enrichment of galaxies. We present $^{18}$O$/^{17}$O ratios derived from simultaneous observations of C$^{18}$O and C$^{17}$O 1-0 toward fifty-one massive star forming regions with the Institut de Radioastronomie Millimétrique (IRAM) 30 meter telescope. Simultaneous observations of HC$^{18}$O$^{+}$ 1-0 and HC$^{17}$O$^{+}$ 1-0 with the Yebes 40m telescope toward five sources from this sample were also done to test the consistency of $^{18}$O$/^{17}$O ratios derived from different isotopic pairs. From our improved measurements, resulting in smaller errors than previous work in the literature, we obtain a clear trend of increasing $^{18}$O$/^{17}$O ratio with increasing galactocentric distance (D$_{GC}$), which provides a significant constraint on Galactic chemical evolution (GCE) models. Current GCE models have to be improved in order to explain the observed C$^{18}$O/C$^{17}$O 1-0 gradient.
description: 15 pages, 5 figures, 1 table, Accepted for publication in MNRAS
Probability density function for random photon steps in a binary (isotropic-Poisson) statistical mixture
Creators: name: Binzoni, Tiziano
name: Mazzolo, Alain
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Monte Carlo (MC) simulations allowing to describe photons propagation in statistical mixtures represent an interest that goes way beyond the domain of optics, and can cover, e.g., nuclear reactor physics, image analysis or life science just to name a few. MC simulations are considered a ``gold standard'' because they give exact solutions (in the statistical sense), however, in the case of statistical mixtures they are enormously time consuming and their implementation is often extremely complex. For this reason, the aim of the present contribution is to propose a new approach that should allow us in the future to simplify the MC approach. This is done through an explanatory example, i.e.; by deriving the `exact' analytical expression for the probability density function of photons' random steps (single step function, SSF) propagating in a medium represented as a binary (isotropic-Poisson) statistical mixture. The use of the SSF reduces the problem to an `equivalent' homogeneous medium behaving exactly as the original binary statistical mixture. This will reduce hundreds time-consuming MC simulations to only one equivalent simple MC simulation. To the best of our knowledge the analytically `exact' SSF for a binary (isotropic-Poisson) statistical mixture has never been derived before.
Integrating Technology and Advising: Studying Enhancements to Colleges’ iPASS Practices
Creators: name: Mayer, Alexander K.
name: Kalamkarian, Hoori Santikian
name: Cohen, Benjamin
name: Pellegrino, Lauren
name: Boynton, Melissa
name: Yang, Edith
Publisher: name: Columbia University
Year: 2019
Subjects: Community colleges
High technology and education
Counseling in higher education
Community college students--Services for
Prediction of scholastic success--Evaluation

description: Integrated Planning and Advising for Student Success (iPASS) is an initiative funded by the Bill & Melinda Gates Foundation to support colleges seeking to incorporate technology into their advising and student services. In iPASS, such technology is intended to increase advising’s emphasis on a student’s entire college experience, enabling advisors to more easily: intervene when students show early warning signs of academic and nonacademic challenges, regularly follow up as students progress through college, refer students to tutoring and other support services when needed, and provide personalized guidance that reflects students’ unique needs. MDRC and CCRC partnered with three institutions already implementing iPASS—California State University, Fresno; Montgomery County Community College; and the University of North Carolina at Charlotte—to study how technology can support advising redesign, employing a randomized controlled trial research design. The three institutions increased their emphasis on providing timely support, boosted their use of advising technologies, and used administrative and communication strategies to increase student contact with advisors. The enhancements generally produced only a modestly different experience for students in the program group compared with students in the control group, although at one college, the enhancements did substantially increase the number of students who had contact with an advisor. Consequently, it is not surprising that the enhancements have so far had no discernible positive effects on students’ academic performance. Nonetheless, some staff members indicated in interviews that implementing and enhancing iPASS has enabled their institution to take steps toward a stronger system to support students and help them succeed.
title: Αξιολόγηση τεφρών (ιπτάμενων/πυθμένα) από καύση σε ρευστοποιημένη κλίνη στερεών βιομηχανικών αποβλήτων-περιβαλλοντικές επιπτώσεις, πιθανές χρήσεις
Creators: name: Κανιαδακης Γεωργιος
Publisher: name: Technical University of Crete
Year: 2017

description: Η παρούσα διπλωματική εργασία είχε ως αντικείμενο την αξιολόγηση των τεφρών που προέκυψαν από καύση σε ρευστοποιημένη κλίνη αγροτοβιομηχανικών και ζωικών αποβλήτων. Ο στόχος ήταν η μελέτη των πιθανών περιβαλλοντικών επιπτώσεων, καθώς και των χρήσεων αυτών. Τα δείγματα που χρησιμοποιήθηκαν ήταν πυρηνόξυλο, ζωική λυμ/λάσπη, κρεατάλευρο και μίγματα αυτών, της βιομηχανίας Creta Farm. Πραγματοποιήθηκαν ποιοτικές και ποσοτικές αναλύσεις των τεφρών όπως κοκκομετρική ανάλυση, προσδιορισμός άκαυστου άνθρακα, καθώς και ορυκτολογική και χημική ανάλυση σε κύρια στοιχεία και ιχνοστοιχεία. Οι αναλύσεις πραγματοποιήθηκαν για ρυθμό τροφοδοσίας καυσίμου 10 έως 14 g/min στη ρευστοποιημένη κλίνη και για λόγους περίσσειας αέρα από 1.3 έως 1.7. Οι τέφρες των καυσίμων χαρακτηρίστηκαν από υψηλή περιεκτικότητα σε Ca, P και Mg, καθώς και σε ιχνοστοιχεία Mn, Cu, Zn και Sr. Μεταβάλλοντας την περίσσεια του αέρα δεν υπήρξε ουσιαστική διαφοροποίηση στη σύσταση των ιπτάμενων τεφρών όλων των δειγμάτων. Για μικρότερη τροφοδοσία καυσίμου ευνοήθηκε η κατακράτηση Ca, K και P στις τέφρες του πυθμένα, ενώ αυξάνοντας την τροφοδοσία του καυσίμου οι ιπτάμενες τέφρες εμπλουτίστηκαν σε ιχνοστοιχεία. Οι εξεταζόμενες τέφρες θα μπορούσαν να χρησιμοποιηθούν ως βελτιωτικά εδάφους ή ως λιπάσματα με άλλα υποπροϊόντα, κυρίως σε όξινα εδάφη.
Universality in relaxation of spin helices under the $XXZ$- spin chain dynamics
Creators: name: Popkov, Vladislav
name: Žnidarič, Marko
name: Zhang, Xin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe dynamics of transverse spin-helix state (SHS) -- a product state with spatially rotating magnetization -- under anisotropic Heisenberg XXZ spin chain evolution. Due to experimental relevance we especially focus on magnetization dynamics. At long times the $U(1)$ symmetry of the Hamiltonian is restored, leading to the decay of transverse magnetization, which can be described as an exponential decay of a spatially harmonic profile. We show that the dependence of the short and intermediate-time decay timescale, which in principle depends on all different parameters, like the wavevector of the initial helix, the anisotropy, etc., can be described well by a single scaling function. We also briefly discuss the evolution of magnetization current.
description: 14 pages, 15 Figures
title: Μελέτη των δομικών λίθων του λιμενοβραχίονα του Ενετικού λιμένα Χανίων και αναζήτηση των χώρων εκλατομεύσης τους
Creators: name: Στεφανογιάννης Γεώργιος
Publisher: name: Technical University of Crete
Year: 1995

description: Μη διαθέσιμο
Scaling properties of RNA as a randomly branching polymer
Creators: name: Vaupotič, Domen
name: Rosa, Angelo
name: Tubiana, Luca
name: Božič, Anže
Publisher: name: arXiv
Year: 2023
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Formation of base pairs between the nucleotides of an RNA sequence gives rise to a complex and often highly branched RNA structure. While numerous studies have demonstrated the functional importance of the high degree of RNA branching -- for instance, for its spatial compactness or interaction with other biological macromolecules -- RNA branching topology remains largely unexplored. Here, we use the theory of randomly branching polymers to explore the scaling properties of RNAs by mapping their secondary structures onto planar tree graphs. Focusing on random RNA sequences of varying lengths, we determine the two scaling exponents related to their topology of branching. Our results indicate that ensembles of RNA secondary structures are characterized by annealed random branching and scale similarly to self-avoiding trees in three dimensions. We further show that the obtained scaling exponents are robust upon changes in nucleotide composition, tree topology, and folding energy parameters. Finally, in order to apply the theory of branching polymers to biological RNAs, whose length cannot be arbitrarily varied, we demonstrate how both scaling exponents can be obtained from the distributions of the related topological quantities of individual RNA molecules with fixed length. In this way, we establish a framework to study the branching properties of RNA and compare them to other known classes of branched polymers. By understanding the scaling properties of RNA related to its branching structure we aim to improve our understanding of the underlying principles and open up the possibility to design RNA sequences with desired topological properties.
description: 13 pages, 4 figures; 10 pages and 8 figures of supplementary material
Adapting Lesson Study for Community College Mathematics Instruction: Early Observations
Creators: name: Bickerstaff, Susan E.
name: Raphael, Jacqueline
name: Zamora, Diana E. Cruz
name: Leong, Melinda
Publisher: name: Columbia University
Year: 2019
Subjects: Community colleges
Educational change
Mathematics--Study and teaching (Higher)
Community colleges--Curricula
Teaching--Evaluation

description: Lesson Study (LS) is a structured, collaborative professional development approach that gives instructors a framework for actively investigating how to improve student learning in their classrooms. Despite evidence of LS improving teacher practice and student learning in K-12 settings, there have been few documented examples of its use among instructors in higher education. The Adapting Lesson Study for Community College Mathematics Instruction project is investigating whether the model can be feasibly implemented by community college mathematics faculty and will eventually document whether and how it influences instructors’ pedagogical practices and student outcomes. In this short report, we describe LS and provide a rationale for its implementation in the community college context. We then report on activities from the first year of the project and share some early observations about LS implementation that could have implications for the effectiveness and sustainability of LS in community colleges.
title: Μελέτη των ενδιάμεσων στείρων του λιγνιτορυχείου του βόρειου πεδίου της Πτολεμαίδας με έμφαση στην καταλληλότητα τους σαν στεγανοποιητικών υλικών
Creators: name: Γκίκας Δημήτριος
Publisher: name: Technical University of Crete
Year: 1995

description: Μη διαθέσιμο
Pulse Profile Modeling of Thermonuclear Burst Oscillations I: The Effect of Neglecting Variability
Creators: name: Kini, Yves
name: Salmi, Tuomo
name: Watts, Anna L.
name: Vinciguerra, Serena
name: Choudhury, Devarshi
name: Fenne, Siem
name: Bogdanov, Slavko
name: Meisel, Zach
name: Suleimanov, Valery
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the effects of the time-variable properties of thermonuclear X-ray bursts on modeling their millisecond-period burst oscillations. We apply the pulse profile modeling technique that is being used in the analysis of rotation-powered millisecond pulsars by the Neutron Star Interior Composition Explorer (NICER) to infer masses, radii, and geometric parameters of neutron stars. By simulating and analyzing a large set of models, we show that overlooking burst time-scale variability in temperatures and sizes of the hot emitting regions can result in substantial bias in the inferred mass and radius. To adequately infer neutron star properties, it is essential to develop a model for the time variable properties or invest a substantial amount of computational time in segmenting the data into non-varying pieces. We discuss prospects for constraints from proposed future X-ray telescopes.
description: Accepted for publication in MNRAS
Phases of attractive spin-imbalanced fermions in square lattices
Creators: name: Chiesa, Simone
name: Zhang, Shiwei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We determine the relative stability of different ground-state phases of spin-imbalanced popula- tions of attractive fermions in square lattices. The phases are systematically characterized by the symmetry of the order parameter and the real- and momentum-space structures using Hartree- Fock-Bogoliubov theory. We find several type of unidirectional Larkin-Ovchinikov-type phases. We discuss the effect of commensuration between the ordering wave vector and the density imbalance, and describe the mechanism of Fermi surface reconstruction and pairing for various orders. A robust supersolid phase is shown to exist when the ordering wave vector is diagonally directed.
description: 6.5 pages, 5 figures
GHz detection rates and dynamic photon-number resolution with superconducting nanowire arrays
Creators: name: Resta, Giovanni V.
name: Stasi, Lorenzo
name: Perrenoud, Matthieu
name: El-Khoury, Sylvain
name: Brydges, Tiff
name: Thew, Rob
name: Zbinden, Hugo
name: Bussières, Félix
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Superconducting-nanowire single-photon detectors (SNSPDs) have enabled the realization of several quantum optics technologies thanks to their high detection efficiency, low dark-counts, and fast recovery time. However, the widespread use of technologies such as linear optical quantum computing (LOQC), quasi-deterministic single photon sources and quantum repeaters requires faster detectors that can distinguish between different photon number states. Here, we report the fabrication of an SNSPD array composed of 14 independent pixels, achieving a system detection efficiency (SDE) of 90% in the telecom band. By reading each pixel of the array independently we show that the detector can detect telecom photons at 1.5 GHz with 45% absolute SDE. We exploit the dynamic PNR of the array to demonstrate accurate state reconstruction for different photon-number statistics for a wide range of light inputs, including operation with long-duration light pulses, as commonly obtained with some cavity-based sources. We show 2-photon and 3-photon fidelities of 74% and 57% respectively, which represent state-of-the-art results for fiber-coupled SNSPDs.
title: Καθορισμός ρύπανσης στον κόλπο Χανίων και Σούδας με δορυφορικά στοιχεία
Creators: name: Μπάρτζος Ηλίας
name: Φραντζής Ξενοφών Α.
Publisher: name: Technical University of Crete
Year: 1996

description: Μη διαθέσιμο
A Ramsey apparatus for proton spins in flowing water
Creators: name: Schulthess, Ivo
name: Fratangelo, Anastasio
name: Hautle, Patrick
name: Heil, Philipp
name: Markaj, Gjon
name: Persoz, Marc
name: Pistillo, Ciro
name: Thorne, Jacob
name: Piegsa, Florian M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present an apparatus that applies Ramsey's method of separated oscillatory fields to proton spins in water molecules. The setup consists of a water circuit, a spin polarizer, a magnetically shielded interaction region with various radio frequency elements, and a nuclear magnetic resonance system to measure the spin polarization. We show that this apparatus can be used for Rabi resonance measurements and to investigate magnetic and pseudomagnetic field effects in Ramsey-type precision measurements with a sensitivity below 100 pT.
Accretion of aerodynamically large pebbles
Creators: name: Huang, Helong
name: Ormel, Chris W.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Due to their aerodynamical coupling with gas, pebbles in protoplanetary discs can drift over large distances to support planet growth in the inner disc. In the past decade, this pebble accretion has been studied extensively for aerodynamically small pebbles (Stokes number St < 1). However, accretion can also operate in the St > 1 mode, e.g., when planetesimals collisionally fragment to smaller bodies or when the primordial gas disc disperses. This work aims to extend the study of pebble accretion to these aerodynamically loosely coupled particles. We integrate the pebble's equation of motion, accounting for gas drag, stellar and planetary gravity, in the midplane of a laminar disc. The accretion probability ($ε$) is calculated as function of Stokes number, disc pressure gradient index, planet mass and eccentricity. We find that for Stokes number above unity $ε$(St) first rises, due to lower drift and aided by a large atmospheric capture radius, until it reaches a plateau where the efficiency approaches 100 per cent. At high St the plateau region terminates as particles become trapped in resonance. These results are well described by a semi-analytical "kick-and-drift" model and we also provide fully analytical prescriptions for $ε$. We apply our model to the accretion of $\sim 30 μ$m dust particles in a dispersing protoplanetary and secondary (CO-rich) debris disc. It shows that physically small particles are mainly accreted as aerodynamically large Stokes number pebbles during the debris disc phase. Earth-mass planets may obtain $\sim 25$ per cent of their heavy elements through this late accretion phase.
description: 19 pages, 16 figures, 5 tables. Accepted for publication in MNRAS
Enormous variation in homogeneity and other anomalous features of room temperature superconductor samples: a Comment on Nature 615, 244 (2023)
Creators: name: Hirsch, J. E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The resistive transition width of a recently discovered room temperature near-ambient-pressure superconductor [1] changes by more than three orders of magnitude between different samples, with the transition temperature nearly unchanged. For the narrowest transitions, the transition width relative to $T_c$ is only $0.014 \%$. The voltage-current characteristics indicate vanishing critical current, and the normal state resistance is unusually small. These anomalous behaviors and other issues indicate that this system is not a superconductor. Implications for other hydrides are discussed.
description: A shorter version was submitted as Matters Arising on "Evidence of near-ambient superconductivity in a N-doped lutetium hydride", Nature 615, 244 (2023)
Mapping the Sites of Putative Tumor Suppressor Genes at 6p25 and 6p21.3 in Cervical Carcinoma: Occurrence of Allelic Deletions in Precancerous Lesions
Creators: name: Chatterjee, Anupam
name: Arias-Pulido, Hugo
name: Koul, Sanjay
name: Beleño, Nestor
name: Perilla, Ana
name: Posso, Hector
name: Mansukhani, Mahesh M.
name: Vundavalli, Murty V.
Publisher: name: Columbia University
Year: 2001
Subjects: subject: Cervix uteri--Cancer
subject: Carcinogenesis
subject: Genetics
subject: FOS: Biological sciences

description: Allelic deletions on the short arm of chromosome 6 (6p) are one of the common, possibly early, genetic changes that occur in the pathogenesis of cervical carcinoma (CC). Previous loss of heterozygosity (LOH) studies in CC identified a number of critical regions of deletions on 6p. However, the precise location of minimally deleted regions and their role in precancer- ous lesions have not been well characterized. To address these questions, we first performed a detailed LOH analysis on 6p in 59 cases of invasive CC. The pattern of LOH identified two minimal regions of deletions, one spanning a 5 cM genetic distance at 6p25 and a second site of 10.3 cM deletion mapping to 6p21.3. The 6p21.3 minimal deletion spans HLA class I genes. To understand the role of 6p genetic alterations in the develop- ment of CC, we also investigated 12 high-grade and 4 low-grade cases of cervical intraepithelial neoplasia (CIN) for LOH after laser microdissec- tion. The high-grade CINs exhibited 91.7% LOH, and low-grade CINs had 50% LOH. These findings implicate the presence of at least two tumor suppressor genes on 6p relevant to CC and suggest that these genetic alterations occur very early in CC development. This study should there- fore facilitate the identification of tumor suppressor genes on 6p and may identify which CINs are at high risk of progressing to invasive CC.
Polarization aberrations in next-generation giant segmented mirror telescopes (GSMTs) I. Effect on the coronagraphic performance
Creators: name: Anche, Ramya M.
name: Ashcraft, Jaren N.
name: Haffert, Sebastiaan Y.
name: Millar-Blanchaer, Maxwell A.
name: Douglas, Ewan S.
name: Snik, Frans
name: Williams, Grant
name: van Holstein, Rob G.
name: Doelman, David
name: Van Gorkom, Kyle
name: Skidmore, Warren
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Next-generation large segmented mirror telescopes are expected to perform direct imaging and characterization of Earth-like rocky planets, which requires contrast limits of $10^{-7}$ to $10^{-8}$ at wavelengths from I to J band. One critical aspect affecting the raw on-sky contrast are polarization aberrations arising from the reflection from the telescope's mirror surfaces and instrument optics. We simulate the polarization aberrations and estimate their effect on the achievable contrast for three next-generation ground-based large segmented mirror telescopes. We performed ray-tracing in Zemax and computed the polarization aberrations and Jones pupil maps using the polarization ray-tracing algorithm. The impact of these aberrations on the contrast is estimated by propagating the Jones pupil maps through a set of idealized coronagraphs using hcipy, a physical optics-based simulation framework. The optical modeling of the giant segmented mirror telescopes (GSMTs) shows that polarization aberrations create significant leakage through a coronagraphic system. The dominant aberration is retardance defocus, which originates from the steep angles on the primary and secondary mirrors. The retardance defocus limits the contrast to $10^{-5}$ to $10^{-4}$ at 1 $λ/D$ at visible wavelengths, and $10^{-5}$ to $10^{-6}$ at infrared wavelengths. The simulations also show that the coating plays a major role in determining the strength of the aberrations. Polarization aberrations will need to be considered during the design of high-contrast imaging instruments for the next generation of extremely large telescopes. This can be achieved either through compensation optics, robust coronagraphs, specialized coatings, calibration, and data analysis approaches or by incorporating polarimetry with high-contrast imaging to measure these effects.
description: 18 pages, 12 figures, Accepted in Astronomy & Astrophysics manuscript no. aa45651-22
title: Ανάπτυξη αναδιατασσόμενων αρχιτεκτονικών για εξόρυξη συχνών υπογράφων
Creators: name: Στρατικόπουλος Αθανάσιος
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
THE ROLE OF COMMERCIAL BANKS IN FINANCING "GREEN ECONOMY" PROJECTS
Creators: name: Saloxov, Sirojiddin
Publisher: name: Zenodo
Year: 2024

description: According to the analysis and results, it was found that the "Green" transition in the recent past is important for the most vulnerable sections of the population of Uzbekistan to climate change. Accordingly, the projected effects of climate change, including increased urban temperatures, frequent droughts, increased water scarcity, and increased threats of desertification and salinization, will affect life in the already impoverished regions of Uzbekistan. may disproportionately affect the level. For example, households in Uzbekistan spend a relatively high proportion of their income on food - in 2016 it was 47.3 percent [1].
Electroweak precision constraints on the electroweak-scale right-handed neutrino model
Creators: name: Hoang, Vinh
name: Hung, Pham Q.
name: Kamat, Ajinkya
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A model of electroweak-scale right-handed neutrino (\ewnur) model was constructed five years ago in which the right-handed neutrinos are members of mirror fermion weak doublets and where the Majorana masses of the right-handed neutrinos are found to be {\em naturally} of the order of the electroweak scale. These features facilitate their searches at the LHC through signals such as like-sign dilepton events. This model contains, in addition to the mirror quarks and leptons, extra scalars transforming as weak triplets. In this paper, we study the constraints imposed on these additional particles by the electroweak precision parameters S, T, and U. These constraints are crucial in determining the viability of the electroweak $ν_R$ model and the allowed parameter space needed for a detailed phenomenology of the model.
description: 43 two-column pages, 16 figures. To appear in NPB
Effects of spatiotemporal correlations in wind data on neural network-based wind predictions
Creators: name: Shin, Heesoo
name: Rüttgers, Mario
name: Lee, Sangseung
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: This paper investigates the influence of incorporating spatiotemporal wind data on the performance of wind forecasting neural networks. While previous studies have shown that including spatial data enhances the accuracy of such models, limited research has explored the impact of different spatial and temporal scales of input wind data on the learnability of neural network models. In this study, convolutional neural networks (CNNs) are employed and trained using various scales of spatiotemporal wind data. The research demonstrates that using spatiotemporally correlated data from the surrounding area and past time steps for training a CNN favorably affects the predictive performance of the model. The study proposes correlation analyses, including autocorrelation and Pearson correlation analyses, to unveil the influence of spatiotemporal wind characteristics on the predictive performance of different CNN models. The spatiotemporal correlations and performances of CNN models are investigated in three regions: Korea, the USA, and the UK. The findings reveal that regions with smaller deviations of autocorrelation coefficients (ACC) are more favorable for CNNs to learn the regional and seasonal wind characteristics. Specifically, the regions of Korea, the USA, and the UK exhibit maximum standard deviations of ACCs of 0.100, 0.043, and 0.023, respectively. The CNNs wind prediction performances follow the reverse order of the regions: UK, USA, and Korea. This highlights the significant impact of regional and seasonal wind conditions on the performance of the prediction models.
description: 27 pages, 18 figures
title: Συγκομιδή ενέργειας από ραδιοσυχνότητες με σκοπό την τροφοδότηση αισθητήρων και ηλεκτρονικών συσκευών χαμηλής ισχύος
Creators: name: Ουαχάμπ Ταουφίκ
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
Der römische Bergbau an der unteren Lahn
Creators: name: Dahm, Otto
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 101 (1897): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Numismatisches aus der Rheinprovinz
Creators: name: Vleuten, F. Van
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 101 (1897): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Infrared spectroscopic confirmation of z~2 photometrically-selected obscured quasars
Creators: name: Ishikawa, Yuzo
name: Wang, Ben
name: Zakamska, Nadia L.
name: Richards, Gordon T.
name: Hennawi, Joseph F.
name: Rivera, Angelica B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The census of obscured quasar populations is incomplete, and remains a major unsolved problem, especially at higher redshifts, where we expect a greater density of galaxy formation and quasar activity. We present Gemini GNIRS near-infrared spectroscopy of 24 luminous obscured quasar candidates from the Sloan Digital Sky Survey's Stripe 82 region. The targets were photometrically selected using a WISE/W4 selection technique that is optimized to identify IR-bright and heavily-reddened/optically-obscured targets at $z>1$. We detect emission lines of ${\rm Hα}$, ${\rm Hβ}$, and/or ${\rm[ O~III]}$ in 23 sources allowing us to measure spectroscopic redshifts in the range $1
description: Accepted by MNRAS, 13 pages, 8 figures, 2 tables
iPASS in Practice: Four Case Studies
Creators: name: Klempin, Serena Constance
name: Pellegrino, Lauren
name: Lopez-Salazar, Andrea
name: Barnett, Elisabeth
name: Lawton, Julia
Publisher: name: Columbia University
Year: 2019
Subjects: Community colleges
Community colleges--Administration
Educational technology--Evaluation
Community college students--Services for
Educational change

description: A range of efforts are underway to improve the effectiveness and efficiency of advising and student supports. Among these is the Integrated Planning and Advising for Student Success (iPASS) initiative. Launched in 2015, the initiative provided three years of financial, technical, and change management support to 26 two- and four-year institutions as they redesigned their advising processes and adopted and implemented new technologies. Over the three years of the grant, Achieving the Dream and EDUCAUSE provided strategic assistance to help institutions leverage both technology and human relationships to undertake a fully scaled redesign of their advising and other student support services. Concurrently, CCRC conducted a series of qualitative and quantitative research studies to understand how institutions approached their redesign and how this work affected students. This report shares the stories of the four community colleges that participated in the iPASS initiative. Each offers a unique example of how a community college chose to implement the iPASS approach, along with a discussion of the main elements of its advising redesign and its experiences with technology integration. After presenting individual case studies of the four colleges, the authors highlight cross-case lessons, which may be useful to college administrators, student services leaders, and advisors who are planning or implementing an advising redesign. As these stories illustrate, the advising redesign process is iterative, collaborative, and challenging, calling for multiple stakeholder groups across an institution to break down silos and work together to improve student outcomes.
A neural network-based scale-adaptive cloud-fraction scheme for GCMs
Creators: name: Chen, Guoxing
name: Wang, Wei-Chyung
name: Yang, Shixi
name: Wang, Yixin
name: Zhang, Feng
name: Wu, Kun
Publisher: name: arXiv
Year: 2023
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Cloud fraction significantly affects the short- and long-wave radiation. Its realistic representation in general circulation models (GCMs) still poses great challenges in modeling the atmosphere. Here, we present a neural network-based diagnostic scheme that uses the grid-mean temperature, pressure, liquid and ice water mixing ratios, and relative humidity to simulate the sub-grid cloud fraction. The scheme, trained using CloudSat data with explicit consideration of grid sizes, realistically simulates the observed cloud fraction with a correlation coefficient (r) > 0.9 for liquid-, mixed-, and ice-phase clouds. The scheme also captures the observed non-monotonic relationship between cloud fraction and relative humidity and is computationally efficient, and robust for GCMs with a variety of horizontal and vertical resolutions. For illustrative purposes, we conducted comparative analyses of the 2006-2019 climatological-mean cloud fractions among CloudSat, and simulations from the new scheme and the Xu-Randall scheme (optimized the same way as the new scheme). The network-based scheme improves not only the spatial distribution of the total cloud fraction but also the cloud vertical structure (r > 0.99). For example, the biases of too-many high-level clouds over the tropics and too-many low-level clouds over regions around 60°S and 60°N in the Xu-Randall scheme are significantly reduced. These improvements are also found to be insensitive to the spatio-temporal variability of large-scale meteorology conditions, implying that the scheme can be used in different climate regimes.
Open Data With OSF - an Overview
Creators: name: Riedl, Lydia
Publisher: name: Zenodo
Year: 2022
Subjects: open science
open data
OSF
repositories
publishing

description: Mix of data? Lack of documentation? Confusion about all the platforms out there? OSF might help. This short overview about using open repositories and publishing data was part of the Marburg Brainhack 2022. Click here to view the whole project.
Orientation relationship of FeNiC and FeNiCSi from variant detection in EBSD data
Creators: name: Seehaus, Mattis
name: Pei, Risheng
name: Korte-Kerzel, Sandra
name: Sandlöbes-Haut, Stefanie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The determination of orientation relationships in dual or multi-phase materials is very important in the field of interface engineering for the design of materials with tailored properties. In this work, a code is developed for the automated and statistical analysis of the orientation relationship of electron backscatter diffraction data. On the example of Fe-Ni-(Si)-C alloys containing lenticular martensite and retained austenite, the code is applied and it is shown that the orientation relationship (OR) corresponds to the Greninger-Troiano OR and that a statistically reliable investigation of the OR between the retained austenite and the related martensite variants is feasible using the code developed in this study.
description: in revision currently in Crystals
Ein helvetisch-römischer Fund vom Lindberg bei Winterthur
Creators: name: S., [?]
Publisher: name: Bonner Jahrbücher
Year: 2017

description: Rezension zu: Ein helvetisch-römischer Fund vom Lindberg bei Winterthur. Von Dr. Ernst Graf. Beilage zum Programm des Gymnasiums und der Industrieschule Winterthur 1897/98
description: Bonner Jahrbücher, Bd. 101 (1897): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Die Kunstdenkmäler der Rheinprovinz
Creators: name: Wiedemann, Alfred
Publisher: name: Bonner Jahrbücher
Year: 2017

description: Rezension zu: Die Kunstdenkmäler der Rheinprovinz. Dritter Band. V. Die Kunstdenkmäler des Kreises Grevenbroich. - Vierter Band. I. Die Kunstdenkmäler des Landkreises Köln. Im Auftrage des Provinzialverbandes der Rheinprovinz herausgegeben von Paul Clemen. Düsseldorf, L. Schwann. 1897. VI und 106 S. 5 Taf., 36 Text-Abbildungen, bez. VI und 206 S. 16 Taf., 89 Textabbildungen
description: Bonner Jahrbücher, Bd. 102 (1898): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Bergische Sagen
Creators: name: Wiedemann, Alfred
Publisher: name: Bonner Jahrbücher
Year: 2017

description: Rezension zu: Bergische Sagen. Gesannnelt und mit Anmerkungen herausgegeben von Otto Schell. Mit fünf Lichtdruckbildern. Elberfeld 1897. Bädekersche Buchhandlung. 8°. 34 und 608 S.
description: Bonner Jahrbücher, Bd. 102 (1898): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Genetic Analysis of the APAF1 Gene in Male Germ Cell Tumors
Creators: name: Bala, Shashi
name: Oliver, Holt
name: Renault, Beatrice
name: Montgomery, Kate
name: Dutta, Shipra
name: Rao, Pulivarthi
name: Houldsworth, Jane
name: Kucherlapati, Raju
name: Wang, X.
name: Vundavalli, Murty V.
Publisher: name: Columbia University
Year: 2000
Subjects: Germ cells
Tumors
Cytogenetics
Genomics

description: Cytogenetic and molecular analyses have shown that the chromosome band 12q22 is recurrently deleted in male germ cell tumors (GCTs), indicating the presence of a candidate tumor suppressor gene (TSG) in this region. To identify the TSG, we mapped the APAF1 gene, a proapoptotic mammalian homologue of ced-4, to chromosomal band 12q22, that suggested that this might be the candidate deleted gene in GCTs. We further localized the gene between the polymorphic markers D12S1671 and D12S1082 at 12q22 to determine the role of APAF1 in the pathogenesis of GCT, and we characterized its normal genomic structure and analyzed its alterations in GCTs. The APAF1 gene comprises 27 exons, with the coding region spanning 26. The region containing APAF1 was found to be deleted in GCT by fluorescence in situ hybridization analysis, but without evidence of coding sequence alterations. RT-PCR and Western blot analysis showed APAF1 gene expression at detectable levels in all GCT cell lines analyzed. An aberrant-sized APAF1 protein was seen in one cell line. This and 2 other cell lines carrying APAF1 deletions also exhibited defects in dATP-mediated caspase-3 activation. Caspase-3 activity was effectively restored by addition of recombinant caspase-9 and APAF1 proteins, and to a lesser extent by caspase-9 alone, but not by APAF1 alone. These data do not support a TSG role for APAF1, but defects in other components of the apoptotic pathway that may be related to 12q22 deletion cannot be ruled out.
Bericht über die Thätigkeit der Provinzialkommission für die Denkmalpflege in der Rheinprovinz vom I. April 1896 bis 31. IVIärz 1897
Creators: name: Clemen, Paul
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 102 (1898): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
title: Παράλληλα αριθμητικά σχήματα για υδροδυναμικές ροές
Creators: name: Πετράκης Ευτύχιος Π.
Publisher: name: Technical University of Crete
Year: 2006

description:  Εισαγωγή -- 2. Εξισώσεις ρηχών υδάτων σε μία και δύο διαστάσεις -- 3. Αριθμητικά σχήματα -- 4. Προβλήματα στις δύο διαστάσεις -- 5. Παράλληλοι υπολογισμοί -- 6. Παράλληλα διδιάστατα αριθμητικά σχήματα
Contemporaneous Observations of $Hα$ Luminosities and Photometric Amplitudes for M Dwarfs
Creators: name: Soto, Aylin García
name: Newton, Elisabeth R.
name: Douglas, Stephanie T.
name: Burrows, Abigail
name: Kesseli, Aurora Y.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: While many M dwarfs are known to have strong magnetic fields and high levels of magnetic activity, we are still unsure about the properties of their starspots and the origin of their magnetic dynamos. Both starspots and chromospheric heating are generated by the surface magnetic field; they produce photometric variability and Halpha emission, respectively. Connecting brightness variations to magnetic activity therefore provides a means to examine M dwarf magnetism. We survey 30 M dwarfs previously identified as fast rotating stars (Prot < 10 days). We present time-series optical photometry from the Transiting Exoplanet Survey Satellite (TESS) and contemporaneous optical spectra obtained using the Ohio State Multi-Object Spectrograph (OSMOS) on the 2.4m Hiltner telescope at MDM Observatory in Arizona. We measure rotation periods and photometric amplitudes from TESS light curves using Gaussian Processes. From the OSMOS spectra, we calculate the equivalent width of Halpha, and LHalpha/Lbol. We find a weak positive correlation between Halpha luminosity and the semi-amplitude, Rvar p=0.005_{-0.005}^{+0.075}. We also observe short-term variability (between 20-45 minutes) in Halpha equivalent widths and possible enhancement from flares consistent to recent literature.
description: 19 pages, 9 Figures, 2 Tables, Poster Presented at Cool Stars 21, Publication post-copy editing
title: Εισαγωγή στους χώρους Sobolev στην πραγματική ευθεία και εφαρμογές
Creators: name: Κουτσάκης Γιάννης
Publisher: name: Technical University of Crete
Year: 2006

description:  Χώροι Sobolev -- 1.1. Ομογενές πρόβλημα Dirichlet -- 1.2. Μη ομογενές πρόβλημα Dirichlet -- 1.3. Παράγωγος συναρτησιακού -- 2. Η πρώτη ιδιοτιμή του p-Λαπλασιανού Τελεστή -- 3. Μελέτη δύο quasilinear συστημάτων -- 3.1. Ύπαρξη πρώτης ιδιοτιμής -- 3.2. Simplicity της πρώτης ιδιοτιμής -- 3.3. Το δεύτερο σύστημα
Early Outcomes of Texas Community College Students Enrolled in Dana Center Mathematics Pathways Prerequisite Developmental Courses
Creators: name: Schudde, Lauren
name: Meiselman, Akiva Yonah
Publisher: name: Columbia University
Year: 2019
Subjects: Community colleges
Mathematics--Remedial teaching
Community colleges--Curricula
Racism in higher education
Academic achievement--Evaluation

description: To improve outcomes in math, many Texas colleges are adopting mathematics pathways, which accelerate developmental math and tailor math courses to different majors instead of requiring all students to take algebra. This study examines whether students participating in Dana Center Mathematics Pathways (DCMP) developmental courses enroll in and pass college-level math courses at higher rates than students who take traditional developmental math courses. It employs regression analysis controlling for student characteristics using student-level data compiled by the state from the more than 20 Texas community colleges that implemented the DCMP model in 2015 and 2016. Results from this study are encouraging. They suggest that DCMP compressed prerequisite developmental courses are effective at accelerating community college students through their math requirements. Yet this study also found systematic sorting of students into DCMP by race/ethnicity, which could exacerbate educational inequalities. Key Findings: DCMP students were about 13 percentage points more likely to enroll in college-level math in the next semester and 8 percentage points more likely to pass college-level math in that term than peers in non-DCMP developmental courses. The advantaged gained by DCMP students was maintained over time—there was still a 5-percentage-point improvement in passing college-level math two years later among students in the fall 2015 cohort. Compared with non-DCMP courses, DCMP courses included more White students and fewer Hispanic students than would be expected based on the distribution of students at the colleges. This indicates inequality in subgroup access to reformed developmental math pathways.
Die fränkischen Grabsteine von Andernach
Creators: name: Lehner, Hans
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 105 (1900): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Deep learning for diffusion in porous media
Creators: name: Graczyk, Krzysztof M.
name: Strzelczyk, Dawid
name: Matyka, Maciej
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We adopt convolutional neural networks (CNN) to predict the basic properties of the porous media. Two different media types are considered: one mimics the sand packings, and the other mimics the systems derived from the extracellular space of biological tissues. The Lattice Boltzmann Method is used to obtain the labeled data necessary for performing supervised learning. We distinguish two tasks. In the first, networks based on the analysis of the system's geometry predict porosity and effective diffusion coefficient. In the second, networks reconstruct the concentration map. In the first task, we propose two types of CNN models: the C-Net and the encoder part of the U-Net. Both networks are modified by adding a self-normalization module [Graczyk \textit{et al.}, Sci Rep 12, 10583 (2022)]. The models predict with reasonable accuracy but only within the data type, they are trained on. For instance, the model trained on sand packings-like samples overshoots or undershoots for biological-like samples. In the second task, we propose the usage of the U-Net architecture. It accurately reconstructs the concentration fields. In contrast to the first task, the network trained on one data type works well for the other. For instance, the model trained on sand packings-like samples works perfectly on biological-like samples. Eventually, for both types of the data, we fit exponents in the Archie's law to find tortuosity that is used to describe the dependence of the effective diffusion on porosity.
description: 15 pages, 17 figures, to appear in Sci. Rep
title: Ανελαστική στατική ανάλυση σύμμεικτων κατασκευών με συστήματα σεισμικής μόνωσης βάσης για ισχυρές εδαφικές κινήσεις
Creators: name: Χατζήνα Ελένη
Publisher: name: Technical University of Crete
Year: 2006

description: Κεφ. 1: Θεωρητικό υπόβαθρο παραμετρικής μελέτης -- Κεφ. 2: Παρουσίαση παραμετρικής μελέτης -- Κεφ. 3: Αποτελέσματα παραμετρικής μελέτης
Heat statistics in the relaxation process of the Edwards-Wilkinson elastic manifold
Creators: name: Wu, Yu-Xin
name: Chen, Jin-Fu
name: Pei, Ji-Hui
name: Zhang, Fan
name: Quan, H. T.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The stochastic thermodynamics of systems with a few degrees of freedom has been studied extensively so far. We would like to extend the study to systems with more degrees of freedom and even further-continuous fields with infinite degrees of freedom. The simplest case for a continuous stochastic field is the Edwards-Wilkinson elastic manifold. It is an exactly solvable model of which the heat statistics in the relaxation process can be calculated analytically. The cumulants require a cutoff spacing to avoid ultra-violet divergence. The scaling behavior of the heat cumulants with time and the system size as well as the large deviation rate function of the heat statistics in the large size limit is obtained.