cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Can gas dynamics in centres of galaxies reveal orbiting massive black holes?
Creators: name: Etherington, James
name: Maciejewski, Witold
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: If supermassive black holes in centres of galaxies form by merging of black-hole remnants of massive Population III stars, then there should be a few black holes of mass one or two orders of magnitude smaller than that of the central ones, orbiting around the centre of a typical galaxy. These black holes constitute a weak perturbation in the gravitational potential, which can generate wave phenomena in gas within a disc close to the centre of the galaxy. Here we show that a single orbiting black hole generates a three-arm spiral pattern in the central gaseous disc. The density excess in the spiral arms in the disc reaches values of 3-12% when the orbiting black hole is about ten times less massive than the central black hole. Therefore the observed density pattern in gas can be used as a signature in detecting the most massive orbiting black holes.
description: accepted by MNRAS, 8 pages, 4 figures
The association of vimentin and fibronectin gene expression with epithelial-mesenchymal transition and tumor malignancy in colorectal carcinoma
Creators: name: Niknami, Zohreh
name: Eslamifar, Ali
name: Emamirazavi, Amirnader
name: Ebrahimi, Alireza
name: Shirkoohi, Reza
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: colorectal cancer
subject: fibronectin
subject: vimentin
subject: qReal-Time PCR
subject: 610

description: Colorectal cancer is the most common malignancy of the gastrointestinal tract with very high mortality. One of the most distinguishing features for the establishment of an epithelial-mesenchymal transition phenotype is the alteration of mesenchymal markers expression and structural adhesion proteins. We evaluated the significance of vimentin and fibronectin gene expression in relation to invasion and metastasis in CRC patients. Tissue specimens were collected consecutively from forty-five colorectal carcinoma patients during surgeries. Tissues were divided into two separate parts for pathological and molecular assays. In order to histological staging, tissue sections were prepared from formalin-fixed paraffin-embedded blocks and stained with Hematoxylin and Eosin. To quantify gene expression, specimens were dissected and homogenized. Moreover, SW480, SW48, SW948, Caco-2, HT-29 and LS174T as human colon cancer cell lines were obtained and cultured, then molecular analyzing was performed. As results the expression of VIM gene increased in SW480, SW48 and SW948 while it decreased in Caco-2, HT-29 and LS174T. Moreover, FN was up-regulated in Caco-2, HT-29 and SW948, while it was down-regulated in SW480, SW48 and LS174T. In tissues, vimentin and fibronectin expression significantly increased in stromal cells, whereas vimentin decreased in colonic epithelial cells and fibronectin had no significant change. Vimentin and fibronectin expression were changed in tumor tissues. It was found an association between vimentin expression with age and tumor size; over-expression in older age and decreasing in larger tumor size. Furthermore, fibronectin over-expression is correlated to older age and high tumor stages; up-regulation with increasing age and high tumor stages.
description: EXCLI Journal;Vol. 16 2017
Model-based Reinforcement Learning for Continuous Control with Posterior Sampling
Creators: name: Fan, Ying
name: Ming, Yifei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Balancing exploration and exploitation is crucial in reinforcement learning (RL). In this paper, we study model-based posterior sampling for reinforcement learning (PSRL) in continuous state-action spaces theoretically and empirically. First, we show the first regret bound of PSRL in continuous spaces which is polynomial in the episode length to the best of our knowledge. With the assumption that reward and transition functions can be modeled by Bayesian linear regression, we develop a regret bound of $\tilde{O}(H^{3/2}d\sqrt{T})$, where $H$ is the episode length, $d$ is the dimension of the state-action space, and $T$ indicates the total time steps. This result matches the best-known regret bound of non-PSRL methods in linear MDPs. Our bound can be extended to nonlinear cases as well with feature embedding: using linear kernels on the feature representation $ϕ$, the regret bound becomes $\tilde{O}(H^{3/2}d_ϕ\sqrt{T})$, where $d_ϕ$ is the dimension of the representation space. Moreover, we present MPC-PSRL, a model-based posterior sampling algorithm with model predictive control for action selection. To capture the uncertainty in models, we use Bayesian linear regression on the penultimate layer (the feature representation layer $ϕ$) of neural networks. Empirical results show that our algorithm achieves the state-of-the-art sample efficiency in benchmark continuous control tasks compared to prior model-based algorithms, and matches the asymptotic performance of model-free algorithms.
description: Accepted to ICML 2021
Ischemic preconditioning modulates ROS to confer protection in liver ischemia and reperfusion
Creators: name: Bystrom, Phillip
name: Foley, Nicole
name: Toledo-Pereyra, Luis
name: Quesnelle, Kelly
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: Ischemia
subject: Reperfusion injury
subject: Liver
subject: Preconditioning
subject: Reactive oxygen species
subject: Oxidative stress
subject: 610

description: Ischemia reperfusion (IR) injury is a significant cause of morbidity and mortality in liver transplantation. When oxygen is reintroduced to the liver graft it initiates a cascade of molecular reactions leading to the release of reactive oxygen species (ROS) and pro-inflammatory cytokines. These soluble mediators propagate a sterile immune response to cause significant tissue damage. Ischemic preconditioning (IPC) is one method that reduces hepatocellular injury by altering the immune response and inhibiting the production of ROS. Studies quantifying the effects of IPC in humans have demonstrated an improved liver enzyme panel in patients receiving grafts pretreated with IPC as compared to patients receiving the standard of care. In our review, we explore current literature in the field in order to describe the mechanism through which IPC regulates the production of ROS and improves IR injury.
description: EXCLI Journal;Vol. 16 2017
Tensor Glueball Photoproduction and Decay
Creators: name: Cotanch, Stephen R.
name: Williams, Robert A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using vector meson dominance (VMD), tensor glueball photoproduction cross sections, asymmetries and widths are calculated. The predicted hadronic VV' decays are comparable for different vector meson (V = rho, omega and phi) channels with the omega phi width the largest but the radiative omega gamma and phi gamma decays are suppressed relative to rho gamma by over a factor of 2. This decay profile is distinct from typical meson branching rates and may be a useful glueball detection signature. Results are compared to a previous VMD scalar glueball study.
description: 13 pages, 5 Postscript figures
title: Amoxycillin and clavulanic acid induced Stevens-Johnson syndrome
title: a case report
titleType: AlternativeTitle
Creators: name: Zaidi, Maheen
name: Zaidi, Syeda Kashaf
name: Bhutto, Moomal
name: Umer, Mohammad Yasir
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: Stevens-Johnson syndrome
subject: amoxycillin and clavulanic acid
subject: hypersensitivity
subject: lesions
subject: Naranjo Adverse Drug Reaction Probability scale
subject: 610

description: Stevens-Johnson syndrome (SJS) is an immune mediated hypersensitivity reaction. Significant involvement of oral, nasal, eye, vaginal, urethral, GI and lower respiratory tract mucous membrane may develop. It is usually a reaction due to a medication or due to an infection. In 95 % of case reports, drugs were found to be an important cause for the development of SJS. In this case report, a 32 year old female reported chief complaint of itch skin eruptions all over the body along with erosive lesions on tongue, lips, buccal mucosa and genital mucosa. The reaction occurred after administration of augmentin (containing amoxycillin and clavulanic acid). She was treated with antimicrobials, antiallergics and conservative management. The patient improved and was discharged from the hospital. Causality assessment using Naranjo Adverse Drug Reaction Probability Scale revealed that amoxycillin and clavulanic acid combination was a possible cause for the adverse reaction with a score of 4.
description: EXCLI Journal;Vol. 16 2017
Multi-particle Representations of the Poincaré Group
Creators: name: Csáki, Csaba
name: Hong, Sungwoo
name: Shirman, Yuri
name: Telem, Ofri
name: Terning, John
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work we extend the definition of asymptotic multi-particle states of the $S$-matrix, beyond the direct products of one-particle states. We identify new quantum numbers which we call pairwise helicities, or $q_{ij}$, associated with asymptotically separated pairs of particles. These signal the appearance of a new source of angular momentum, beyond the orbital and spin contributions. The essence of our construction is to first treat all single particles as well as all particle pairs independently, ultimately projecting onto the physical states. The resulting representations reproduce the usual direct product states for vanishing $q_{ij}$, while for vanishing spins they reproduce Zwanziger's electric-magnetic multi-particle states. Pairwise helicity then appears as a label for the extra little group phase for our quantum states, in addition to their standard little group transformation. Our newly defined multi-particle states are the correct asymptotic states for the scattering of electric and magnetic charges, with pairwise helicity identified as $q_{ij}=e_i g_j-e_j g_i$.
Political contributions firm performance and M&A activity in the US
Creators: name: Μπαμπανάσιος, Δημήτριος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Political contribution
subject: M&A process
subject: Takeover premium
subject: Hubris hypothesis
subject: Acquirers
subject: Target firms

description: Με τη γενική πεποίθηση ότι οι πολιτικές δωρεές και οι πολιτικές διασυνδέσεις που δημιουργούνται μπορούν να επηρεάσουν το αποτέλεσμα της διαδικασίας συγχωνεύσεων και εξαγορών, η παρούσα μελέτη παρουσιάζει στοιχεία αυτής της επίδρασης στις συμφωνίες συγχωνεύσεων και εξαγορών που γίνονται στις ΗΠΑ. Τα ευρήματα της μελέτης δείχνουν ότι οι πολιτικά συνδεδεμένοι αγοραστές επωφελούνται από τις πολιτικές συνεισφορές και τις συνδέσεις που επιτυγχάνονται μέσω αυτών. Όπως προκύπτει από την ανάλυση, οι αγοραστές με πολιτικές διασυνδέσεις καταβάλλουν πολύ υψηλότερο τίμημα για τις επιχειρήσεις στόχους από τους μη πολιτικά συνδεδεμένους αγοραστές. Η ερμηνεία αυτής της συμπεριφοράς δίνεται από την Υπόθεση της Ύβρεως και την πολιτική υποστήριξη πίσω από αυτήν.
Unconditional quantum cloning of coherent states with linear optics
Creators: name: Andersen, Ulrik L.
name: Josse, Vincent
name: Leuchs, Gerd
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A scheme for optimal Gaussian cloning of optical coherent states is proposed and experimentally demonstrated. Its optical realization is based entirely on simple linear optical elements and homodyne detection. The optimality of the presented scheme is only limited by detection inefficiencies. Experimentally we achieved a cloning fidelity of about 65%, which almost touches the optimal value of 2/3.
description: Phys. Rev. Lett. Volume 94, Number 24, p. 240503
Direct Measurement of a Non-Hermitian Topological Invariant in a Hybrid Light-Matter System
Creators: name: Su, Rui
name: Estrecho, Eliezer
name: Biegańska, Dąbrówka
name: Huang, Yuqing
name: Wurdack, Matthias
name: Pieczarka, Maciej
name: Truscott, Andrew G.
name: Liew, Timothy C. H.
name: Ostrovskaya, Elena A.
name: Xiong, Qihua
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Topology is central to understanding and engineering materials that display robust physical phenomena immune to imperfections. Different topological phases of matter are characterised by topological invariants. In energy-conserving (Hermitian) systems, these invariants are determined by the winding of eigenstates in momentum space. In non-Hermitian systems, a novel topological invariant is predicted to emerge from the winding of the complex eigenenergies. Here, we directly measure the non-Hermitian topological invariant arising from exceptional points in the momentum-resolved spectrum of exciton polaritons. These are hybrid light-matter quasiparticles formed by photons strongly coupled to electron-hole pairs (excitons) in a halide perovskite semiconductor at room temperature. We experimentally map out both the real (energy) and imaginary (linewidth) parts of the spectrum near the exceptional points and extract the novel topological invariant - fractional spectral winding. Our work represents an essential step towards realisation of non-Hermitian topological phases in a condensed matter system.
PlenoptiCam v1.0: A light-field imaging framework
Creators: name: Hahne, Christopher
name: Aggoun, Amar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Light-field cameras play a vital role for rich 3-D information retrieval in narrow range depth sensing applications. The key obstacle in composing light-fields from exposures taken by a plenoptic camera is to computationally calibrate, align and rearrange four-dimensional image data. Several attempts have been proposed to enhance the overall image quality by tailoring pipelines dedicated to particular plenoptic cameras and improving the consistency across viewpoints at the expense of high computational loads. The framework presented herein advances prior outcomes thanks to its novel micro image scale-space analysis for generic camera calibration independent of the lens specifications and its parallax-invariant, cost-effective viewpoint color equalization from optimal transport theory. Artifacts from the sensor and micro lens grid are compensated in an innovative way to enable superior quality in sub-aperture image extraction, computational refocusing and Scheimpflug rendering with sub-sampling capabilities. Benchmark comparisons using established image metrics suggest that our proposed pipeline outperforms state-of-the-art tool chains in the majority of cases. Results from a Wasserstein distance further show that our color transfer outdoes the existing transport methods. Our algorithms are released under an open-source license, offer cross-platform compatibility with few dependencies and different user interfaces. This makes the reproduction of results and experimentation with plenoptic camera technology convenient for peer researchers, developers, photographers, data scientists and others working in this field.
description: final author version
[Brev til DKNVS]
Creators: name: Riunione Degli Scienziati Italiani
name: Det Kongelige Norske Videnskabers Selskab (DKNVS)
Publisher: name: Unknown
Year: 1843

description: Invitasjon til møte (tryk.)
description: Med oversettelse på baksida. Polydoc nr. 1: 2615. Polydoc nr. 2: 2045.
Spatial assessment of current and future migration in response to climate risks in Ghana and Nigeria
Creators: name: Schürmann, Alina
name: Teucher, Mike
name: Kleemann, Janina
name: Inkoom, Justice Nana
name: Nyarko, Benjamin Kofi
name: Okhimamhe, Appollonia Aimiosino
name: Conrad, Christopher
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2025
Subjects: subject: 550

description: West Africa’s vulnerability to climate change is influenced by a complex interplay of socio-economic and environmental factors, exacerbated by the region’s reliance on rain-fed agriculture. Climate variability, combined with rapid population growth, intensifies existing socio-economic challenges. Migration has become a key adaptive response to these challenges, enabling communities to diversify livelihoods and enhance resilience. However, spatial patterns of migration in response to climate risks are not fully understood. Thus, the study evaluates the applicability of the IPCC risk assessment framework to map and predict migration patterns in Ghana and Nigeria, with a focus on identifying areas of potential out-migration. By integrating geospatial environmental, socio-economic, and population data, the study highlights areas that have a higher likelihood of migration for the current baseline and near future (2050). Future climate is modeled using CMIP6 projections under the RCP4.5 scenario, while population projections providing insight into future exposure. The results from the baseline assessment are compared with actual migrant motivations, providing a ground-level perspective on migration drivers. In northern Ghana and Nigeria, elevated hazard, vulnerability, and exposure scores suggest a higher likelihood of migration due to the overall risk faced by the population. This pattern is projected to persist in the future. However, migrant responses indicate that environmental factors often play a secondary role, with vulnerability factors cited more frequently as migration drivers. The findings highlight the importance of developing localized adaptation strategies that address the specific needs of vulnerable areas. Additionally, management strategies that enhance community resilience and support sustainable migration pathways will be critical in addressing future climate-induced migration challenges.
Recent update on biological activities and pharmacological actions of liraglutide
Creators: name: Tiwari, Juhi
name: Gupta, Gaurav
name: Dahiya, Rajiv
name: Pabreja, Kavita
name: Kumar Sharma, Rakesh
name: Mishra, Anurag
name: Dua, Kamal
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: 610

description: EXCLI Journal;Vol. 16 2017
A random walker on a ratchet
Creators: name: Mateos, Jose L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We analyze a model for a walker moving on a ratchet potential. This model is motivated by the properties of transport of motor proteins, like kinesin and myosin. The walker consists of two feet represented as two particles coupled nonlinearly through a bistable potential. In contrast to linear coupling, the bistable potential admits a richer dynamics where the ordering of the particles can alternate during the walking. The transitions between the two stable states on the bistable potential correspond to a walking with alternating particles. We distinguish between two main walking styles: alternating and no alternating, resembling the hand-over-hand and the inchworm walking in motor proteins, respectively. When the equilibrium distance between the two particles divided by the periodicity of the ratchet is an integer, we obtain a maximum for the current, indicating optimal transport.
description: 10 pages, 5 figures
Information constraint in open quantum systems
Creators: name: Liu, Chun-Hui
name: Chen, Shu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose an effect called information constraint which is characterized by the existence of different decay rates of signal strengths propagating along opposite directions. It is an intrinsic property of a type of open quantum system, which does not rely on boundary conditions. We define the value of information constraint ($I_C$) as the ratio of different decay rates and derive the analytical representation of $I_C$ for general quadratic Lindbladian systems. Based on information constraint, we can provide a simple and elegant explanation of chiral and helical damping, and get the local maximum points of relative particle number for the periodical boundary system, consistent with numerical calculations. Inspired by information constraint, we propose and prove the correspondence between edge modes and damping modes. A new damping mode called Dirac damping is constructed, and chiral/helical damping can be regarded as a special case of Dirac damping.
description: 17 pages, 2 figures
Gravitational waves from colliding vacuum bubbles in gauge theories
Creators: name: Lewicki, Marek
name: Vaskonen, Ville
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study production of gravitational waves (GWs) in strongly supercooled cosmological phase transitions in gauge theories. We extract from two-bubble lattice simulations the scaling of the GW source, and use it in many-bubble simulations in the thin-wall limit to estimate the resulting GW spectrum. We find that in presence of the gauge field the GW source decays with bubble radius as $\propto R^{-3}$ after collisions. This leads to a GW spectrum that follows $Ω_{\rm GW} \propto ω^{2.3}$ at low frequencies and $Ω_{\rm GW} \propto ω^{-2.4}$ at high frequencies, marking a significant deviation from the popular envelope approximation.
description: 10 pages, 5 figures. fixed a small mistake in the computation of the GW spectrum, minor changes in the results
title: Ο ιδιωτικός κλάδος υπηρεσιών υγείας στην Ελλάδα. Μελέτη περίπτωσης «Όμιλος ΥΓΕΙΑ»
title: Private health services in Greece. A case study on "HYGEIA Group"
titleType: AlternativeTitle
Creators: name: Λιάκου, Φλώρα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Σύστημα υγείας
subject: Ιδιωτικός τομέας
subject: Ζήτηση υπηρεσιών υγείας
subject: Προσφορά υπηρεσιών υγείας
subject: Ικανοποίηση ασθενών
subject: Ανταγωνισμός
subject: Porter analysis
subject: SWOT analysis
subject: Στρατηγικό μάνατζμεντ
subject: Ανάπτυξη ιδιωτικού κλάδου

description: Το θέμα της παρούσας διπλωματικής εργασίας έχει ως πεδίο ανάλυσης την ανάπτυξη του ιδιωτικού τομέα υπηρεσιών υγείας στην Ελλάδα αποτυπώνοντας την υφιστάμενη κατάσταση στην ελληνική αγορά. Ο κλάδος της Υγείας αποτελεί μια εξαιρετικά ιδιόμορφη αγορά. Οι επιχειρήσεις αυτού του κλάδου είναι ενταγμένες σε ένα σύνθετο σύστημα υγείας με ένα διαφοροποιημένο και πολύμορφο φάσμα υπηρεσιών. Στην πολιτική της υγείας, η ανησυχία για το συνεχές αυξανόμενο κόστος, τη στενότητα των πόρων, τις απαιτήσεις για οικονομική αποδοτικότητα και παραγωγικότητα και για το επίπεδο ποιότητας των υπηρεσιών, ωθεί στην υιοθέτηση ενός συστήματος διοίκησης και διαχείρισης τέτοιο ώστε να είναι ικανό να δημιουργήσει κίνητρα και να αντιμετωπίσει τις προκλήσεις των σύγχρονων συστημάτων υγείας. Στο πρώτο κεφάλαιο γίνεται μια ανασκόπηση της Ελληνικής Οικονομίας, της οργάνωσης του Ελληνικού Συστήματος Υγείας και πως επιδρούν μεταξύ τους και κατ’ επέκταση πως συμβάλουν στην ελληνική κοινωνία και την προάσπιση της υγείας των πολιτών. Εν συνεχεία, στο δεύτερο και τρίτο κεφάλαιο αναλύεται ενδελεχώς ο ιδιωτικός τομέας υπηρεσιών υγείας με προσεκτική προσέγγιση στην προσφορά και τη ζήτηση. Κατόπιν, θέλοντας να κατανοήσουμε εκτενέστερα την αγορά των ιδιωτικών υπηρεσιών, γίνεται έμφαση στη στρατηγική ανάπτυξης, στο πεδίο ανταγωνισμού και τις προοπτικές των παρεχόμενων υπηρεσιών υγείας με γνώμονα τις ανάγκες των ασθενών, την παραγωγικότητα του συστήματος και την οικονομική αποδοτικότητα. Στο τέταρτο κεφάλαιο, θα αποτυπωθεί ο ρόλος της στρατηγικής διοίκησης στη λειτουργία και την ανάπτυξη κάθε επιχείρησης σε ένα συνεχώς μεταβαλλόμενο και ανταγωνιστικό περιβάλλον. Η ανάγκη για στρατηγικό σχεδιασμό με σκοπό τη δημιουργία εσωτερικού και εξωτερικού πλεονεκτήματος ώστε να μειωθεί η αβεβαιότητα και να επιτευχθεί η ικανοποίηση του προσωπικού και των χρηστών, επιβάλλει οργάνωση, συντονισμό και έλεγχο. Στο πέμπτο κεφάλαιο γίνεται μελέτη περίπτωσης όσον αφορά τον Όμιλο «Υγεία» εστιάζοντας στο όραμα, την οργανωτική διάρθρωση, τα χρηματοοικονομικά στοιχεία, το εσωτερικό και εξωτερικό περιβάλλον του ομίλου. Τέλος, στο έκτο κεφάλαιο αναλύεται η στρατηγική του Ομίλου «ΥΓΕΙΑ», η επίτευξη των παγκόσμιων στόχων για τη βιώσιμη ανάπτυξη, η τρέχουσα κατάσταση του Ομίλου και η στοχοθεσία. Στην εκπόνηση της εργασίας πραγματοποιούνται οι αναλύσεις Porter προκειμένου να μελετηθεί το μικρο- περιβάλλον και ανάλυση Swot για την μελέτη του εσωτερικού και του εξωτερικού περιβάλλοντος των υπηρεσιών υγείας.
Eta absorption by mesons
Creators: name: Liu, W.
name: Ko, C. M.
name: Chen, L. W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using the $[SU(3)_{\mathrm{L}} \times SU(3)_{\mathrm{R}}]_{\mathrm{global}% }\times [SU(3)_V]_{\mathrm{local}}$ chiral Lagrangian with hidden local symmetry, we evaluate the cross sections for the absorption of eta meson ($% η$) by pion ($π$), rho ($ρ$), omega ($ω$), kaon ($K$), and kaon star ($K^*$) in the tree-level approximation. With empirical masses and coupling constants as well as reasonable values for the cutoff parameter in the form factors at interaction vertices, we find that most cross sections are less than 1 mb, except the reactions $ρη\to K\bar K^*(\bar KK^*)$, $ωη\to K\bar K^*(\bar KK^*)$, $K^*η\toρK$, and $K^*η\toωK$, which are a few mb, and the reactions $πη\to K\bar K$ and $Kη\toπK$, which are more than 10 mb. Including these reactions in a kinetic model based on a schematic hydrodynamic description of relativistic heavy ion collisions, we find that the abundance of eta mesons likely reaches chemical equilibrium with other hadrons in nuclear collisions at the Relativistic Heavy Ion Collider.
description: 29 pages, 10 figures, version to appear in Nucl. Phys. A
Ultrafast lattice dynamics and electron-phonon coupling in platinum extracted with a global fitting approach for time-resolved polycrystalline diffraction data
Creators: name: Zahn, Daniela
name: Seiler, Hélène
name: Windsor, Yoav William
name: Ernstorfer, Ralph
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Quantitative knowledge of electron-phonon coupling is important for many applications as well as for the fundamental understanding of nonequilibrium relaxation processes. Time-resolved diffraction provides direct access to this knowledge through its sensitivity to laser-induced lattice dynamics. Here, we present an approach for analyzing time-resolved polycrystalline diffraction data. A two-step routine is used to minimize the number of time-dependent fit parameters. The lattice dynamics are extracted by finding the best fit to the full transient diffraction pattern rather than by analyzing transient changes of individual Debye-Scherrer rings. We apply this approach to platinum, an important component of novel photocatalytic and spintronic applications, for which a large variation of literature values exists for the electron-phonon coupling parameter $G_\mathrm{ep}$. Based on the extracted evolution of the atomic mean squared displacement (MSD) and using a two-temperature model (TTM), we obtain $G_\mathrm{ep}=(3.9\pm0.2)\cdot10^{17}\frac{\mathrm{W}}{\mathrm{m}^3\hspace{1pt}\mathrm{K}}$ (statistical error). We find that at least up to an absorbed energy density of $124\hspace{2pt}\frac{\mathrm{J}}{\mathrm{cm}^3}$, $G_\mathrm{ep}$ is not fluence-dependent. Our results for the lattice dynamics of platinum provide insights into electron-phonon coupling and phonon thermalization and constitute a basis for quantitative descriptions of platinum-based heterostructures in nonequilibrium conditions.
Gaussian time-dependent variational principle for the finite-temperature anharmonic lattice dynamics
Creators: name: Lihm, Jae-Mo
name: Park, Cheol-Hwan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The anharmonic lattice is a representative example of an interacting bosonic many-body system. The self-consistent harmonic approximation has proven versatile for the study of the equilibrium properties of anharmonic lattices. However, the study of dynamical properties therewithin resorts to an ansatz, whose validity has not yet been theoretically proven. Here, we apply the time-dependent variational principle, a recently emerging useful tool for studying the dynamic properties of interacting many-body systems, to the anharmonic lattice Hamiltonian at finite temperature using the Gaussian states as the variational manifold. We derive an analytic formula for the position-position correlation function and the phonon self-energy, proving the dynamical ansatz of the self-consistent harmonic approximation. We establish a fruitful connection between time-dependent variational principle and the anharmonic lattice Hamiltonian, providing insights in both fields. Our work expands the range of applicability of time-dependent variational principle to first-principles lattice Hamiltonians and lays the groundwork for the study of dynamical properties of the anharmonic lattice using a fully variational framework.
description: v2: Added a citation to L. Monacelli and F. Mauri, "Time-Dependent Self Consistent Harmonic Approximation: Anharmonic nuclear quantum dynamics and time correlation functions," arXiv:2011.14986 and a note on it
Microscopic theory of the two-proton radioactivity
Creators: name: Rotureau, J.
name: Okolowicz, J.
name: Ploszajczak, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We formulate theory of the two-proton radioactivity based on the real-energy continuum shell model. This microscopic approach is applied to describe the two-proton decay of the $1^-_2$ state in $^{18}$Ne.
description: 4 pages, 3 figures
Molecular characterization of pediatric spindle cell tumors
Creators: name: Knezevich, Stevan Robert
Publisher: name: University of British Columbia
Year: 2009

description: Congenital fibrosarcoma (CFS) is a cellular, mitotically active neoplasm of soft tissues. It affects infants less than two years of age, has a low metastatic rate and a relatively high propensity for local recurrence. One of the predominant clinical issues surrounding CFS is its distinction from other histologically identical and virtually indistinguishable pediatric spindle cell tumors including adult-type fibrosarcoma (ATFS) and infantile fibromatosis (IFB). ATFS is a malignant lesion that is treated more aggressively than CFS, while IFB is a benign lesion which is treated less aggressively. Reliable distinction between these entities is therefore clinically very important. We therefore wanted to identify a diagnostic tool to distinguish CFS from other fibroblastic tumors such as ATFS and IFB. Cytogenetic analysis of CFS cases has shown a nonrandom gain in chromosomes 8, 11, 17, and 20 with trisomy for chromosome 11 being present in most cases. Cytogeneticists at the Department of Pathology of B.C.C.H. recently identified recurrent cytogenetic alterations involving chromosome 12pl3 and 15q25 in three CFS cases, which were not present in ATFS, IFB, and aggressive fibromatosis. Cloning of the chromosomal breakpoints revealed a novel fusion between the ETS transcription factor member, ETV6, and the gene encoding the neurotrophin-3 cell surface receptor, NTRK3. This fusion results in the juxtaposition of the HLH dimerization domain of ETV6 to the protein tyrosine kinase (PTK) domain of NTRK3. We hypothesized that this molecule acts as an aberrant PTK signaling molecule in which the HLH domain mediates ligand independent dimerization resulting in constitutive PTK activation. The fusion protein exists as a 70-80 kDa doublet and was found to undergo homodimerization as well as heterodimerization with ETV6. Furthermore, we were able to show that the ETV6-NTRK3 protein acts as a PTK that was capable of interacting with PLCγ1, but not with other known NTRK3 interactors including SHC, SH2Bβ, GRB2 and PI3K. Moreover, ETV6-NTRK3 was shown to localize mainly in the cytoplasm. Our data support the notion that CFS is a biologically distinct entity, and ETV6-NTRK3 detection provides a diagnostic screening tool potentially useful in the clinical evaluation of children with spindle cell tumors.
The Economics of Harvesting and Transporting Hardwood Forest Residue for Conversion to Fuel Ethanol: A Case Study for Minnesota
Creators: name: Petrolia, Daniel R.
name: Petrolia, Daniel R.
Publisher: name: Unknown
Year: 2006
Subjects: subject: Resource /Energy Economics and Policy
subject: biomass
subject: economics
subject: ethanol
subject: residue supply

description: Forest residues are being considered as potential feedstock for a biomass-to-ethanol facility in Minnesota (USA), using residues from major wood-producing counties in Minnesota, Wisconsin, and Michigan. Results indicate that marginal residue costs delivered to a conversion facility would be $56-80/Mg for a small (95-189 MM liters) plant, and about $81/Mg for a larger (379 MM liters) plant. Output beyond these levels would involve substitution of lower-cost market pulpwood as the plant feedstock because of relatively high marginal residue costs. Sensitivity analysis indicates that either a 20-percent increase or decrease in the quantity of available residue would impact marginal cost estimates by no more than $15/Mg.
Observations of Stellar Maser Sources with no IRAS Counterpart
Creators: name: Deguchi, S.
name: Nakashima, J.
name: Miyata, T.
name: Ita, Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigated stellar maser sources with no IRAS counterpart at the radio, middle-infrared, and near-infrared wavelengths. A 43 GHz SiO maser search for 120 2MASS/MSX objects, and 10 OH 1612 MHz sources with no or a very faint MSX counterpart, resulted in 43 SiO detections: one OH 1612 MHz source, 2 near-infrared stars, and 40 MSX sources. Additional near-infrared J-, H-, and K-band observations of the OH 1612 MHz sources detected 5 near-infrared counterparts. Furthermore, middle-infrared imaging observations at 8.8, 9.7, 12.4, and 24.5 micron with the Subaru 8.2-m telescope found counterparts for 2 near-infrared stars with SiO masers, and counterparts for 6 OH 1612 MHz sources. However, 4 OH 1612 MHz sources were not detected in the sensitive near- and middle-infrared searches; three of these are relatively strong OH maser sources for which the positions were known accurately. We conclude that one of these (OH 028.286-01.801) must be a young object in a star-forming region.
description: PASJ 57, No.6 issue in press (1 color figure), full high res. figures available at ftp://ftp.nro.nao.ac.jp/nroreport/no629.pdf.gz. PASJ 57 No. 6 (Dec 25, 2005 issue) in press
Stochastic Geometry-based Modelling of Mobile UAV Relay Networks under Realistic Fading
Creators: name: Moulin, Francois De Saint
name: Wiame, Charles
name: Oestges, Claude
name: Vandendorpe, Luc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We consider a relay network based on Unmanned Aerial Vehicles (UAV). Terrestrial Base Stations (TBS) and UAV Relay Nodes (RN) are modelled using two Homogeneous Poisson Point Processes (HPPP). UAVs can hover at a fixed position or move following specific displacement schemes. The Coverage Probability (CP) of a typical user equipment (UE) is derived, either when it communicates via a direct link (from the TBS to the UE) or via a relay link (from the TBS to the UE through a UAV RN). Every link can be in Line-of-Sight (LoS) or Non Line-of-Sight (NLoS), and suffers from Rician fading with distance-dependent parameters. This coverage is calculated by means of both stochastic geometry (SG) and Monte-Carlo (MC) simulations. The benefits of the use of UAV as RNs are analysed depending on their altitude, density, and mobility scheme.
description: 10 pages, 4 figures. Complete technical paper, associated with a submission at the 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring) (https://events.vtsociety.org/vtc2021-spring/) with DOI https://doi.org/10.1109/VTC2021-Spring51267.2021.9448745 First version published on Arxiv on 13/10/2020, added to IEEE Xplore on 15/06/2021
AGGREGATION OVER CONSUMERS AND THE ESTIMATION OF A DEMAND SYSTEM FOR U.S. FOOD
Creators: name: Falconi, Cesar
name: Senauer, Benjamin
name: Falconi, Cesar
name: Senauer, Benjamin
Publisher: name: Unknown
Year: 1991
Subjects: Consumer/Household Economics
Demand and Price Analysis

description: This paper estimates a complete demand system for food for the United States using an extension of the Almost Ideal Demand System (AIDS) with household and aggregate data. The major purpose is to explore the implications of aggregation over consumers. Empirical evidence, based on data from the 1980-87 Continuing Consumer Expenditure Surveys, shows that the regression results and demand elasticities of the household and aggregate models and data can be very similar. Further results reveal factors which affect the similarity of the household and aggregate estimates.
Anomalous electron-phonon coupling probed on the surface of ZrB$_{12}$ superconductor
Creators: name: Khasanov, R.
name: Di Castro, D.
name: Belogolovskii, M.
name: Paderno, Yu.
name: Filippov, V.
name: Brütsch, R.
name: Keller, H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Magnetization measurements under hydrostatic pressure up to 10.5 kbar in zirconium dodecaboride ZrB$_{12}$ superconductor ($T_c\simeq6.0$ K at $p=0$) were carried out. A negative pressure effect on $T_c$ with ${\rm d} T_c/{\rm d} p =-0.0225(3)$ K/kbar was observed. The electron-phonon coupling constant $λ_{el-ph}$ decreases with increasing pressure with ${\rm d}\lnλ_{el-ph}/{\rm d}p\simeq-0.20$%/kbar. The magnetic field penetration depth $λ$ was studied in the Meissner state and, therefore, probes only the surface of the sample. The absolute values of $λ$ and the superconducting energy gap at ambient pressure and zero temperature were found to be $λ(0)=$140(30) nm and $Δ_0=$1.251(9) meV, respectively. $Δ_0$ scales linearly with $T_c$ as $2Δ_0/k_BT_c=4.79(1)$. The studies of the pressure effect on $λ$ reveal that $λ^{-2}$ increases with pressure with ${\rm d}\lnλ^{-2}(0)/{\rm d}p=0.60(23)$ %/kbar. This effect can not be explained within the framework of conventional adiabatic electron-phonon pairing, suggesting that close to the surface, an unconventional {\it non-adiabatic} character of the electron-phonon coupling takes place.
description: 5 pages, 3 figures
Anticonvulsant effect of liraglutide, GLP-1 agonist by averting a change in GABA and brain glutathione level on picrotoxin-induced seizures
Creators: name: Gupta, Gaurav
name: Dahiya, Rajiv
name: Dua, Kamal
name: Chellappan, Dinesh Kumar
name: Tiwari, Juhi
name: Narayan Sharma, Ganesh
name: Kumar Singh, Santosh
name: Mishra, Anurag
name: Kumar Sharma, Rakesh
name: Agrawal, Mohit
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: 610

description: EXCLI Journal;Vol. 16 2017
An escape time criterion for queueing networks: Asymptotic risk-sensitive control via differential games
Creators: name: Atar, Rami
name: Dupuis, Paul
name: Shwartz, Adam
Publisher: name: arXiv
Year: 2005
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: Primary 60F10, 60K25, secondary 93E20, 60F17

description: We consider the problem of risk-sensitive control of a stochastic network. In controlling such a network, an escape time criterion can be useful if one wishes to regulate the occurrence of large buffers and buffer overflow. In this paper a risk-sensitive escape time criterion is formulated, which in comparison to the ordinary escape time criteria penalizes exits which occur on short time intervals more heavily. The properties of the risk-sensitive problem are studied in the large buffer limit, and related to the value of a deterministic differential game with constrained dynamics. We prove that the game has value, and that the value is the (viscosity) solution of a PDE. For a simple network, the value is computed, demonstrating the applicability of the approach.
title: A Modeling Approach to Understanding Glyphosate Transport in the Belize River Watershed
Creators: name: Astmann, Barbara
Publisher: name: University of Kentucky Libraries
Year: 2020
Subjects: subject: FOS: Civil engineering

description: Glyphosate is the most widely used herbicide worldwide and is often transported from application areas to surface water when solubilized in runoff or sorbed to eroded sediment. There is evidence that suggests both glyphosate and its main metabolite aminomethylphosphonic acid (AMPA) may pose a risk to human health, as well as cause adverse effects in the environment. However, consistent monitoring data is still limited, especially in developing countries. Belize is a developing nation with agriculture being a major sector of its economy and is heavily reliant on glyphosate. The widespread use of glyphosate in Belize may be resulting in glyphosate transport to drinking water resources. Samples were collected from two rural communities that rely on the Belize River for their drinking water systems, Bullet Tree and Spanish Lookout, at points upstream of the abstraction site, at the abstraction site, and at the site of drinking water distribution. Samples were analyzed using HPLC, ELISA kits, and LC-MS/MS. From these analyses, it was concluded that glyphosate was not present in any water samples at a detectable concentration. The Soil and Water Assessment Tool (SWAT) was used to develop a model of the Belize River Watershed. The model was calibrated and validated for observed flow rates using the SWAT Calibration and Uncertainty Program (SWAT-CUP), which revealed acceptable model performance for simulating flow. Model results indicate that glyphosate transport to the Belize River is occurring, with contributions from glyphosate sorbed to eroded sediment being significantly greater than soluble glyphosate in surface runoff (p-values <0.0). Average simulated concentrations of soluble glyphosate in both wet and dry seasons are below the European Union (EU) standard of 0.1 ppb across the watershed. However, subbasins 2, 3, and 28 were identified as higher risk areas, due to having the highest percentages of days exceeding the EU standard. Subbasin 28, located just downstream of the Spanish Lookout drinking water system, was the most significant contributor of soluble glyphosate to the river, as compared to soluble glyphosate concentrations in subbasins 2 (p-values <0.0) and 3 (p-values <0.0). Soluble glyphosate concentrations in subbasin 28 inflow and outflow exceeded the EU standard 12.53% and 11.65% of the time, respectively. This work demonstrates a framework for applying SWAT for pesticide transport modeling in developing countries, and has the potential to be a powerful and accessible tool for watershed management when monitoring data is unavailable.
description: © 2020 Barbara Anmei Astmann
Revisiting KELT-19Ab, WASP-156b and WASP-121b in the TESS Era
Creators: name: Yang, Fan
name: Chary, Ranga-Ram
name: Liu, Ji-Feng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a re-analysis of transit depths of KELT-19Ab, WASP-156b, and WASP-121b, including data from the Transiting Exoplanet Survey Satellite (TESS). The large $\sim$21$\arcsec$ TESS pixels and point spread function result in significant contamination of the stellar flux by nearby objects. We use Gaia data to fit for and remove this contribution, providing general-purpose software for this correction. We find all three sources have a larger inclination, compared to earlier work. For WASP-121b, we find significantly smaller values (13.5 degrees) of the inclination when using the 30 minutes cadence data compared to the 2 minutes cadence data. Using simulations, we demonstrate that the radius ratio of exoplanet to star ($R_{p}/R_{\ast}$) is biased small relative to data taken with a larger sampling interval although oversampling corrections mitigate the bias. This is particularly important for deriving sub-percent transit differences between bands. We find the radius ratio of exoplanet to star ($R_{p}/R_{\ast}$) in the TESS band is 7.5$σ$ smaller than previous work for KELT-19Ab, but consistent to within $\sim$2$σ$ for WASP-156b and WASP-121b. The difference could be due to specific choices in the analysis, not necessarily due to the presence of atmospheric features. The result for KELT-19Ab possibly favors a haze-dominated atmosphere. We do not find evidence for the $\sim$0.95\,$μ$m water feature contaminating transit depths in the TESS band for these stars but show that with photometric precision of 500ppm and with a sampling of about 200 observations across the entire transit, this feature could be detectable in a more narrow $z-$band.
description: Accepted to AJ
title: Are berries useless by-products of ginseng?
title: Recent research on the potential health benefits of ginseng berry
titleType: AlternativeTitle
Creators: name: Hyun, Tae Kyung
name: Jang, Keum-Il
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: 610

description: EXCLI Journal;Vol. 16 2017