cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Honigmann Process - a mathematical study
Creators: name: Baum, Ann-Kristin
name: Strenge, Lia
Publisher: name: Technische Universität Berlin
Year: 2015
Subjects: subject: 510 Mathematik
subject: thermochemical energy storage
subject: Honigmann process
subject: strangeness index
subject: differential-algebraic equations

description: The Honigmann process is a thermochemical energy storage converting low temperature heat into mechanical work. To control and optimize the operation of the storage, the Honigmann process is simulated numerically using a set of differential-algebraic equations (DAEs) as governing equations. We analyze this DAE regarding its solvability, the uniqueness of solutions and the efficiency of numerical solvers. We identify the steps of the process modeled by a reliable, uniquely solvable mathematical model and point out those steps, where the mathematical model may lead to ambiguous solutions. For the steps of the process described by a uniquely solvable model, we compare several numerical solvers with respect to efficiency and accuracy.
Generalized integrability conditions and target space geometry
Creators: name: Adam, C.
name: Sanchez-Guillen, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In some higher dimensional nonlinear field theories integrable subsectors with infinitely many conservation laws have been identified by imposing additional integrability conditions. Originally, the complex eikonal equation was chosen as integrability condition, but recently further generalizations have been proposed. Here we show how these new integrability conditions may be derived from the geometry of the target space and, more precisely, from the Noether currents related to a certain class of target space transformations.
description: 14 pages, Latex
Predicting Gas-Particle Partitioning Coefficients of Atmospheric Molecules with Machine Learning
Creators: name: Lumiaro, Emma
name: Todorović, Milica
name: Kurten, Theo
name: Vehkamäki, Hanna
name: Rinke, Patrick
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: The formation, properties and lifetime of secondary organic aerosols in the atmosphere are largely determined by gas-particle partitioning coefficients of the participating organic vapours. Since these coefficients are often difficult to measure or compute, we developed a machine learning (ML) model to predict them given molecular structure as input. Our data-driven approach is based on the dataset by Wang et al. (Atmos. Chem. Phys., 17, 7529 (2017)), who computed the partitioning coefficients and saturation vapour pressures of 3414 atmospheric oxidation products from the master chemical mechanism using the COSMOtherm program. We train a kernel ridge regression (KRR) ML model on the saturation vapour pressure ($P_{sat}$), and on two equilibrium partitioning coefficients: between a water-insoluble organic matter phase and the gas phase ($K_{WIOM/G}$), and between an infinitely dilute solution with pure water and the gas phase ($K_{W/G}$). For the input representation of the atomic structure of each organic molecule to the machine, we test different descriptors. Our best ML model predicts $P_{sat}$ and $K_{WIOM/G}$ to within 0.3 and $K_{W/G}$ to within 0.4 logarithmic units of the original COSMOtherm calculations. This is equal or better than the typical accuracy of COSMOtherm predictions compared to experimental data. We then apply our ML model to a dataset of 35,383 molecules that we generated based on a carbon 10 backbone and functionalized with 0 to 6 carboxyl, carbonyl or hydroxyl groups to evaluate its performance for polyfunctional compounds with potentially low $P_{sat}$. The resulting $P_{sat}$ and partitioning coefficient distributions were physico-chemically reasonable, and the volatility predictions for the most highly oxidized compounds were in qualitative agreement with experimentally inferred volatilities of atmospheric oxidation products with similar elemental composition.
EARLY TO LATE OLIGOCENE CALCAREOUS NANNOFOSSIL BIOEVENTS IN THE MEDITERRANEAN (UMBRIA-MARCHE BASIN, CENTRAL ITALY)
Creators: name: MAIORANO, PATRIZIA
name: MONECHI, SIMONETTA
Publisher: name: Università degli Studi di Milano
Year: 2006

description: Calcareous nannofossil assemblages have been investigated by means of quantitative analyses in three Oligocene pelagic sections located in the Umbria-Marche Apennines (Central Italy). The studied sections mainly consist of marly limestones and marls belonging to the Scaglia Cinerea Formation, and include the interval between NP23 and NP25 representing a time interval of about 3.5 Ma. Biostratigraphic resolution is extremely low and only two standard bioevents are known, which are the FO of Sphenolithus ciperoensis and the LO of Sphenolithus distentus. The distribution patterns of poorly known or recently described calcareous nannofossils provided a valuable tool for improving the current biostratigraphic framework. The studied interval is characterized by significant changes in the calcareous nannofossil assemblages and by several extinction events. The last occurrence (LO) and/or the last common occurrence (LCO) here proposed are: the LO of Sphenolithus akropodus, the LO of Reticulofenestra circus, the LCO of Helicosphaera ethologa, the LCO of Helicosphaera compactathe LO of Discoaster tanii nodifer. The reversal in abundance between Sphenolithus predistentus and S. distentus provided an additional biostratigraphic constraint at the NP23-NP24 transition. In addition biometric criteria enabled the recognition of the first common occurrence (FCO) of Cyclicargolithus abisectus > 12 mm as potential bioevent within NP24. The quantitative distribution of Sphenolithus distentus suggests to rely on the LCO of the species rather than on the LO, for the identification of NP24-NP25 boundary. The identified bioevents is a first step towards the improvement of the present Mediterranean biostratigraphic framework of the Oligocene geological record. A preliminary correlation of the bioevents to the Geomagnetic Polarity Time Scale is presented.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 112, No 2
Detecting degree symmetries in networks
Creators: name: Holme, Petter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The surrounding of a vertex in a network can be more or less symmetric. We derive measures of a specific kind of symmetry of a vertex which we call degree symmetry -- the property that many paths going out from a vertex have overlapping degree sequences. These measures are evaluated on artificial and real networks. Specifically we consider vertices in the human metabolic network. We also measure the average degree-symmetry coefficient for different classes of real-world network. We find that most studied examples are weakly positively degree-symmetric. The exceptions are an airport network (having a negative degree-symmetry coefficient) and one-mode projections of social affiliation networks that are rather strongly degree-symmetric.
Cellular and Developmental Basis of Avian Structural Coloration
Creators: name: Saranathan, Vinodkumar
name: Finet, Cédric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Vivid structural colors in birds are a conspicuous and vital part of their phenotype. They are produced by a rich diversity of integumentary photonic nanostructures in skin and feathers. Unlike pigmentary coloration, whose molecular genetic basis is being elucidated, little is known regarding the pathways underpinning organismal structural coloration. Here, we review available data on the development of avian structural colors. In particular, feather photonic nanostructures are understood to be intracellularly self-assembled by physicochemical forces typically seen in soft colloidal systems. We identify promising avenues for future research that can address current knowledge gaps, which is also highly relevant for the sustainable engineering of advanced bioinspired and biomimetic materials.
description: 10 pages, 2 figures, LaTeX; typos corrected; submitted to Current Opinion in Genetics and Development
Congruence of matrix spaces, matrix tuples, and multilinear maps
Creators: name: Belitskii, Genrich R.
name: Futorny, Vyacheslav
name: Muzychuk, Mikhail
name: Sergeichuk, Vladimir V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 15A21, 15A63, 15A69

description: Two matrix vector spaces $V,W\subset \mathbb C^{n\times n}$ are said to be equivalent if $SVR=W$ for some nonsingular $S$ and $R$. These spaces are congruent if $R=S^T$. We prove that if all matrices in $V$ and $W$ are symmetric, or all matrices in $V$ and $W$ are skew-symmetric, then $V$ and $W$ are congruent if and only if they are equivalent. Let $F: U\times\dots\times U\to V$ and $G: U'\times\dots\times U'\to V'$ be symmetric or skew-symmetric $k$-linear maps over $\mathbb C$. If there exists a set of linear bijections $φ_1,\dots,φ_k:U\to U'$ and $ψ:V\to V'$ that transforms $F$ to $G$, then there exists such a set with $φ_1=\dots=φ_k$.
description: 18 pages
Tinkering with executive term limits: partisan imbalances and institutional legacies in Latin America
Creators: name: Negretto, Gabriel L.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer

description: Why are some democratically elected presidents more likely than others to extend or remove their current term limits? This paper argues that the frequency and type of reforms relaxing executive term limits depend on the relative partisan power of presidents and on inherited institutional constraints. These reforms are more likely when short-term shifts in the distribution of partisan resources significantly favour an incumbent executive vis-à-vis the opposition. Yet partisan imbalances do not fully account for the observed variation in outcomes across presidential democracies. Long-standing institutional legacies also affect whether presidents are willing and able to ease existing term limits. Specifically, the maintenance of effective executive constraints over time reduces the probability that incumbents facing restrictions on consecutive re-election will obtain a one-term extension and makes it extremely unlikely that they will abolish term limits altogether. A statistical analysis of reforms allowing consecutive executive re-election in Latin America between 1978 and 2015 and a comparison between Ecuador and Colombia support these arguments.
Business continuity-inspired resilient supply chain network design
Creators: name: Namdar, Jafar
name: S. Ali Torabi
name: Sahebjamnia, Navid
name: Ninad Nilkanth Pradhan
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biotechnology
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy
subject: Hematology

description: Supply chains are prone to several operational and disruption risks. In order to design a resilient supply chain network capable of responding to such potential risks suitably, this paper proposes a novel framework for the business continuity-inspired resilient supply chain network design (BCRSCND) problem, which includes three steps. First, four resilience dimensions including Anticipation, Preparation, Robustness, and Recovery are considered to quantify the resilience score of each facility using a multi-criteria decision-making technique and considering a comprehensive set of resilience strategies. In the second step, the critical processes and their business continuity metrics (which are vital for supply chain continuity), are identified. The outputs of the first two steps provide the inputs of a novel two-stage mixed possibilistic-stochastic programing (TSMPSP) model. The model aims to design a multi-echelon, multi-product resilient supply chain network under both operational and disruption risks. The proposed TSMPSP model allows decision makers to incorporate their risk attitudes into the design process. After converting the original TSMPSP model into the crisp counterpart, several sensitivity analyses are conducted on different features of hypothetical disruptions (i.e. their severity, likelihood and location) and DM’s risk attitudes from which useful managerial insights are provided.
Long Horizon Forecasting With Temporal Point Processes
Creators: name: Deshpande, Prathamesh
name: Marathe, Kamlesh
name: De, Abir
name: Sarawagi, Sunita
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In recent years, marked temporal point processes (MTPPs) have emerged as a powerful modeling machinery to characterize asynchronous events in a wide variety of applications. MTPPs have demonstrated significant potential in predicting event-timings, especially for events arriving in near future. However, due to current design choices, MTPPs often show poor predictive performance at forecasting event arrivals in distant future. To ameliorate this limitation, in this paper, we design DualTPP which is specifically well-suited to long horizon event forecasting. DualTPP has two components. The first component is an intensity free MTPP model, which captures microscopic or granular level signals of the event dynamics by modeling the time of future events. The second component takes a different dual perspective of modeling aggregated counts of events in a given time-window, thus encapsulating macroscopic event dynamics. Then we develop a novel inference framework jointly over the two models % for efficiently forecasting long horizon events by solving a sequence of constrained quadratic optimization problems. Experiments with a diverse set of real datasets show that DualTPP outperforms existing MTPP methods on long horizon forecasting by substantial margins, achieving almost an order of magnitude reduction in Wasserstein distance between actual events and forecasts.
description: 9 pages, 4 figures
One-to-one relationships between Industry 4.0 technologies and Lean Production techniques: a multiple case study
Creators: name: Ciano, Maria Pia
name: Dallasega, Patrick
name: Orzes, Guido
name: Rossi, Tommaso
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Production research literature and industry practice have started to pay increasing attention to the Industry 4.0 (I4.0) phenomenon. Scholars and practitioners identified a strong link between this paradigm and the well-known Lean Production (LP) paradigm. Most studies consider LP as a prerequisite of I4.0 and I4.0 as a tool to overcome LP limits and boost its practices. However, so far, these effects have been studied only at a high level, without an in-depth and comprehensive pairwise analysis at a practice-technology level. Moreover, few empirical studies have been carried out on this topic. Our paper attempts to fill these gaps by conducting a multiple case studies research to explain the one-to-one relationships between LP techniques and I4.0 technologies, and vice versa. More specifically, the one-to-one analysis examines the enabling effect of LP on I4.0 and the empowering effect of I4.0 on LP. Based on the empirical analyses, we propose a framework on the relationships between the two paradigms structured into six areas drawn from previous research (i.e. manufacturing equipment and processes, shop-floor management, workforce management, new product development, supplier relationships, customer relationships). Such representation clarifies the interdependence of the two paradigms in the whole supply chain.
Nonlinear Stochastic Evolution Equations: Analysis and Numerics
Creators: name: Emmrich, Etienne
name: Kruse, Raphael
name: Wittbold, Petra
Publisher: name: Technische Universität Berlin
Year: 2016
Subjects: subject: 510 Mathematik
subject: collection
subject: abstract
subject: lecture

description: This is the complete collection of all abstracts for the talks presented during the workshop on "Nonlinear Stochastic Evolution Equations: Analysis and Numerics", which took place on November 3 - 5, 2016 at TU Berlin.
String-localized covariant quantum fields
Creators: name: Mund, Jens
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a construction of string--localized covariant free quantum fields for a large class of irreducible (ray) representations of the Poincare group. Among these are the representations of mass zero and infinite spin, which are known to be incompatible with point-like localized fields. (Based on joint work with B.Schroer and J.Yngvason [13].)
description: 16 pages; Submitted to the proceedings of the symposium in honour of Jaques Bros, Paris 2004
A Peculiar Dynamically Warped Theory Space
Creators: name: Carone, Christopher D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a supersymmetric deconstructed gauge theory in which a warp factor emerges dynamically, driven by Fayet-Iliopoulos terms. The model is peculiar in that it possesses a global supersymmetry that remains unbroken despite nonvanishing D-term vacuum expectation values. Inclusion of gravity and/or additional messenger fields leads to the collective breaking of supersymmetry and to an unusual phenomenology.
description: 4 pages LaTeX, Presented at SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, Irvine, California, USA 12-17 June 2006
Confidentiality and information-sharing practices of Ministry for Children and Families social workers
Creators: name: Douglas, Janet Louise
Publisher: name: University of British Columbia
Year: 2009

description: The move towards a more multidisciplinary approach to the delivery of child protection services in British Columbia raises concerns about the sharing of confidential case material. Factors associated with the information-sharing practices of social workers with law enforcement agencies were examined in this research. This descriptive study involved surveying forty-one intake child protection social workers employed by the Ministry for Children and Families in Vancouver and Coquitlam, using questionnaires. Knowledge of existing legislation, methods of accessing and sharing information with police, and attitudes about police involvement were examined, as well as workers' experience and participation in training. The analysis identified both contributors and obstacles to effective information-sharing and collaboration between social workers and police officers. Informal methods of accessing information were shown to be the most highly used and successful, but the lack of understanding of legislation and of each other's roles interfered with collaborative practice. The results of this research will be of assistance in future training, as well as the development of interagency protocols.
Suite V - Die den Weg Weisende. Teil 2: Essays 326-337
Creators: name: Unterreiter, Andreas
Publisher: name: Technische Universität Berlin
Year: 2016
Subjects: subject: 510 Mathematik
subject: Focus
subject: GW
subject: Limes Ordinatus
subject: ana1
subject: rf1qx

description: M focus inferior von E. focinf M. efocinf M. M focus superior von E. focsup M. efocsup M. M focus von E. foc M. efoc M. Filter-Basis. (M,E) gw inferior von x. gwinf(M,E). egwinf(M,E). (M,E) gw superior von x. gwsup(M,E). egwsup(M,E). (M,E) gw von x. gw(M,E). egw(M,E). E upkt p. (M,E) limes inferior von x in p. liminf (M,E)(x,p). eliminf (M,E)(x,p). (M,E) limes superior von x in p. limsup (M,E)(x,p). elimsup (M,E)(x,p). (M,E) limes ordinatus von x in p. limord (M,E)(x,p). elimord (M,E)(x,p). Modellierung: Generation und Abbau II. Zeitdiskretes Modell. R ist ana1 von q,x. rf1qx.
Magnetism in one-dimensional quantum dot arrays
Creators: name: Karkkainen, K.
name: Koskinen, M.
name: Reimann, S. M.
name: Manninen, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We employ the density functional Kohn-Sham method in the local spin-density approximation to study the electronic structure and magnetism of quasi one-dimensional periodic arrays of few-electron quantum dots. At small values of the lattice constant, the single dots overlap, forming a non-magnetic quantum wire with nearly homogenous density. As the confinement perpendicular to the wire is increased, i.e. as the wire is squeezed to become more one-dimensional, it undergoes a spin-Peierls transition. Magnetism sets in as the quantum dots are placed further apart. It is determined by the electronic shell filling of the individual quantum dots. At larger values of the lattice constant, the band structure for odd numbers of electrons per dot indicates that the array could support spin-polarized transport and therefore act as a spin filter.
description: 11 pages, 6 figures
Dataset: LoED: The LoRaWAN at the Edge Dataset
Creators: name: Bhatia, Laksh
name: Breza, Michael
name: Marfievici, Ramona
name: McCann, Julie A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This paper presents the LoRaWAN at the Edge Dataset (LoED), an open LoRaWAN packet dataset collected at gateways. Real-world LoRaWAN datasets are important for repeatable sensor-network and communications research and evaluation as, if carefully collected, they provide realistic working assumptions. LoED data is collected from nine gateways over a four month period in a dense urban environment. The dataset contains packet header information and all physical layer properties reported by gateways such as the CRC, RSSI, SNR and spreading factor. Files are provided to analyse the data and get aggregated statistics. The dataset is available at: doi.org/10.5281/zenodo.4121430
description: Accepted for publication at The 3rd International SenSys+BuildSys Workshop on Data: Acquisition to Analysis (DATA '20)
M/PH/C queue under a congestion-based staffing policy with applications in steel industry operations
Creators: name: Yanhe Jia
name: Zhang, Zhe George
name: Lixin Tang
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Medicine
subject: Pharmacology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: 111714 Mental Health
subject: FOS: Health sciences

description: To avoid either idle servers or an over-congested situation, we analyse a queueing system with a variable number of servers. Specifically, if the queue length exceeds an upper threshold, all of the servers are serving customers, and if the number of idle servers reaches a threshold (or the number of customers is below a lower threshold), these idle servers are turned off. We call this policy Congestion-Based Staffing (CBS) with two thresholds. Optimising these thresholds under a certain cost structure is the focus of this paper. The key factor in modelling a manufacturing or service system with random service requests by a queueing model is to realistically model the random service times. Although the exponential distribution has been used successfully to model the service times of a call centre, it is not appropriate for manufacturing or service systems. We propose to use a Phase-type (PH) distribution for modelling the service times in a manufacturing system, as it is more flexible and can fit any shape of distribution in theory. Therefore, we build an M/PH/C model with the CBS policy and develop a solution procedure for computing the queue length stationary distribution. Based on this stationary distribution, we investigate a real-world system in the Shanghai Baoshan Iron and Steel Complex. Using the real data and a realistic cost structure, we determine the optimal CBS policy in terms of minimising the operating cost. This policy yields an operating cost that is considerably smaller than the operating cost under a practical policy.
Universal Short-Range Repulsion in the Baryon System Originating from the Confinement --Approach in String-Junction Model--
Creators: name: Tamagaki, Ryozo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show a way to unifiedly understand the origins of the repulsive core of baryon-baryon interaction and the universal repulsion of three-baryon interaction needed to avoid dramatic softening of the equation of state of neutron stars due to hyperon mixing. For this aim we adopt the string-junction model which embodies the essential aspects of the confinement in the baryon system confirmed by recent lattice QCD calculations. Key concept of this study lies in the recognition that baryonic short-range repulsion appears as the latent effect implying the energy necessary for full overlap of baryons, for the confinement to persist at such situation. Numerical results are shown and related problems are discussed.
description: 25 pages, 9 figures
Renovating Requirements Engineering: First Thoughts to Shape Requirements Engineering as a Profession
Creators: name: Pham, Yen Dieu
name: Montgomery, Lloyd
name: Maalej, Walid
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Legacy software systems typically include vital data for organizations that use them and should thus to be regularly maintained. Ideally, organizations should rely on Requirements Engineers to understand and manage changes of stakeholder needs and system constraints. However, due to time and cost pressure, and with a heavy focus on implementation, organizations often choose to forgo Requirements Engineers and rather focus on ad-hoc bug fixing and maintenance. This position paper discusses what Requirements Engineers could possibly learn from other similar roles to become crucial for the evolution of legacy systems. Particularly, we compare the roles of Requirements Engineers (according to IREB), Building Architects (according to the German regulations), and Product Owners (according to "The Scrum-Guide"). We discuss overlaps along four dimensions: liability, self-portrayal, core activities, and artifacts. Finally we draw insights from these related fields to foster the concept of a Requirements Engineer as a distinguished profession.
description: 5 pages, 1 figure, 1 table, accepted at the 2019 IEEE 3rd International Workshop on Learning from other Disciplines for RE (D4RE) at ICSE
Quantum mechanics with a time-dependent random unitary Hamiltonian: A perturbative study of the nonlinear Keldysh sigma-model
Creators: name: Ivanov, D. A.
name: Skvortsov, M. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We analyze the perturbative series of the Keldysh-type sigma-model proposed recently for describing the quantum mechanics with time-dependent Hamiltonians from the unitary Wigner-Dyson random-matrix ensemble. We observe that vertices of orders higher than four cancel, which allows us to reduce the calculation of the energy-diffusion constant to that in a special kind of the matrix ϕ^4 model. We further verify that the perturbative four-loop correction to the energy-diffusion constant in the high-velocity limit cancels, in agreement with the conjecture of one of the authors.
description: 27 pages, 15 figures; typos corrected, one reference added
HISTORY OF MOLLUSC COMMUNITY TYPES AND FAUNAL DYNAMICS IN CONTINENTAL SALINE ECOSYSTEMS OF THE SOUTH MEDITERRANEAN QUATERNARY
Creators: name: KOWALKE, THORSTEN
Publisher: name: Università degli Studi di Milano
Year: 2006

description: Quaternary continental aquatic ecosystems characterised by poly/eusaline waters, and without a connection to the Mediterranean Sea, are dominated by the potamidid gastropod Potamides conicus (Blainville) and the cardiid bivalve Cerastoderma glaucum (Poiret). Metasaline environments are characterised by monotypic occurrences of C. glaucum. The primarily freshwater-dwelling thiarid gastropod Melanoides tuberculata (Müller), in contrast, colonised oligo/mesosaline habitats, similarly to its precursors from the Upper Messinian Lago-Mare ecosystems. In case of the establishment of saline conditions in former freshwater environments, characteristic taphocoenoses document the dynamic development in the context of progressive evaporation: the Melanoides palaeocommunity from a Holocene ecosystem at In Ecker (S Algeria) is accompanied by freshwater inhabitants, which did not reach their adult size of complete development due to the temporal character of their habitats. Oligo/mesosaline conditions are reflected in oxygen isotope signatures of the Melanoides shells. High variations in carbon isotope values indicate changes in the composition of the diet during ontogeny, and may support the interpretation that the ecosystem developed progressively. In comparison to Neogene and fossil Quaternary assemblages, the composition of extant eusaline communities is considerably more diversified: larger North African lakes in Libya and Egypt are characterised by neozoan elements originating from the Mediterranean fauna. The dynamic development of these faunas was predominantly supported by anthropochory in the context of fish cultures. The mode of early ontogenetic development played an important role with regard to the introduction of gastropods to continental environments, since the entire spectrum of euryhaline coastal gastropods with planktotrophic larval development is absent from these ecosystems. The preadaptational loss of planktotrophy enabled Potamides to establish persisting populations. Apart from its brooding mode, Melanoides is characterised by parthenogenesis, and thus a single individual, introduced to a continental ecosystem, can establish a population.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 112, No 2
Alone or With Others? Understanding Eating Episodes of College Students with Mobile Sensing
Creators: name: Meegahapola, Lakmal
name: Ruiz-Correa, Salvador
name: Gatica-Perez, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Understanding food consumption patterns and contexts using mobile sensing is fundamental to build mobile health applications that require minimal user interaction to generate mobile food diaries. Many available mobile food diaries, both commercial and in research, heavily rely on self-reports, and this dependency limits the long term adoption of these apps by people. The social context of eating (alone, with friends, with family, with a partner, etc.) is an important self-reported feature that influences aspects such as food type, psychological state while eating, and the amount of food, according to prior research in nutrition and behavioral sciences. In this work, we use two datasets regarding the everyday eating behavior of college students in two countries, namely Switzerland (N_ch=122) and Mexico (N_mx=84), to examine the relation between the social context of eating and passive sensing data from wearables and smartphones. Moreover, we design a classification task, namely inferring eating-alone vs. eating-with-others episodes using passive sensing data and time of eating, obtaining accuracies between 77% and 81%. We believe that this is a first step towards understanding more complex social contexts related to food consumption using mobile sensing.
description: 19th International Conference on Mobile and Ubiquitous Multimedia (MUM 2020)
Parent's Behavior and Children Deviancy: Counselling Implications
Creators: name: Agbajor Tsaninomi Helena
Publisher: name: Zenodo
Year: 2019

description: The study examined the influence of parent’s actions and parenting style on their children and the counselling implications with a view of assisting parents to develop the right behavior that could help curb their children’s deviancy. The various concepts in the study were defined; types and causes of deviancy were also explored. It further discussed parents’ behavior and their parenting styles that could result in deviant behavior in children. The study was concluded with counselling measures and parental skills that could be adopted to correct children deviant behavior.
SILICEOUS SPONGE SPICULES FROM THE MIOCENE MEM MONIZ MARLS (PORTUGAL) AND THEIR ENVIRONMENTAL SIGNIFICANCE
Creators: name: PISERA, ANDRZEJ
name: CACHÃO, MÁRIO
name: MARQUES DA SILVA, CARLOS
Publisher: name: Università degli Studi di Milano
Year: 2006

description: The Miocene (middle Serravalian) Mem Moniz marls from Algarve (Portugal) contain a rich and well preserved assemblage of siliceous sponge spicules, which is described here for the first time. The assemblage indicates that the sponge fauna was dominated by Astrophorida, and in particular by Geodiidae. The presence of Eurylus sp. and probably Geodia sp. (both Astrophorida), Samus sp. (Spirophorida) and Alectona wallichii (Hadromerida) is also reported. Samus sp. and Alectona wallichii are reported from the fossil record for the first time. Additionally, the occurrence of lithistid demosponges (represented by Theonellidae and rhizomorinids), Hadromerida, Spirophorida and Hexactinellida is also shown. Ancorinidae, Pachastrellidae (and/or Cathropellidae), both Astrophorida, were also clearly recognized. Less certain is the occurrence, in the Mem Moniz marls, of Tethyidae (Hadromerida). Bathymetric reconstructions based on sponges are imprecise due to the fact that these organisms often have very wide bathymetric ranges. However, the studied sponge assemblage is clearly neither characteristic of very shallow nor very deep marine environments. The dominance of astrophorids and the presence of lithistids and hexactinellids suggest a depth of at least several tens to one hundred metres, or even more.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 112, No 2
Kaluza-Klein Multi-Black Holes in Five-Dimensional Einstein-Maxwell Theory
Creators: name: Ishihara, Hideki
name: Kimura, Masashi
name: Matsuno, Ken
name: Tomizawa, Shinya
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct the Kaluza-Klein multi-black hole solutions on the Gibbons-Hawking multi-instanton space in the five-dimensional Einstein-Maxwell theory. We study geometric properties of the multi-black hole solutions. In particular, unlike the Gibbons-Hawking multi-instanton solutions, each nut-charge is able to take a different value due to the existence of black hole on it. The spatial cross section of each horizon can be admitted to have the topology of a different lens space L(n;1)=S^3/Z_n addition to S^3.
description: 8 pages, to be published in Classical and Quantum Gravity
On the asymptotic decay of the Schrödinger--Newton ground state
Creators: name: Kiessling, Michael K. -H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The asymptotics of the ground state $u(r)$ of the Schrödinger--Newton equation in $\mathbb{R}^3$ was determined by V. Moroz and J. van Schaftingen to be $u(r) \sim A e^{-r}/ r^{1 - \|u\|_2^2/8π}$ for some $A>0$, in units that fix the exponential rate to unity. They left open the value of $\|u\|_2^2$, the squared $L^2$ norm of $u$. Here it is rigorously shown that $2^{1/3}3π^2\leq \|u\|_2^2\leq 2^{3}π^{3/2}$. It is reported that numerically $\|u\|_2^2\approx 14.03π$, revealing that the monomial prefactor of $e^{-r}$ increases with $r$ in a concave manner. Asymptotic results are proposed for the Schrödinger--Newton equation with external $\sim - K/r$ potential, and for the related Hartree equation of a bosonic atom or ion.
description: 5 pages; compared to the published version in Physics Letters A, a factor $2^{7/2}$ has been corrected into $2^3$ in the Proposition. The improved bound is not only better than the originally reported one, it is strong enough to prove concavity of the monomial pre-factor
Semidefinite Relaxations for Parallel Machine Scheduling
Creators: name: Skutella, Martin
Publisher: name: Technische Universität Berlin
Year: 1998
Subjects: subject: 510 Mathematik
subject: approximation algorithm
subject: randomized algorithm
subject: convex quadratic program
subject: semidefinite programming
subject: scheduling

description: We consider the problem of scheduling unrelated parallel machines so as to minimize the total weighted completion time of jobs.Whereas the best previously known approximation algorithms for this problem are based on LP relaxations, we give a 32–approximation algorithm that relies on a convex quadratic programming relaxation. For the special case of two machines we present a further improvement to a 1.2752–approximation; we introduce a more sophisticated semidefinite programming relaxation and apply the random hyperplane technique introduced by Goemans and Williams on for the MAXCUT problem and its refined version of Feige and Goemans. To the best of our knowledge, this is the first time that convex and semidefinite programming techniques (apart from LPs) are used in the area of scheduling.
FIRST EVIDENCE OF THE SORICIDAE (MAMMALIA) ASORICULUS GIBBERODON (PETÉNYI, 1864) IN THE PLEISTOCENE OF NORTH IBERIA
Creators: name: ROFES, JUAN
name: CUENCA-BESCÓS, GLORIA
Publisher: name: Università degli Studi di Milano
Year: 2006

description: The paper describes thirteen specimens of the extinct red-toothed shrew Asoriculus gibberodon (Petényi, 1864) from the lower levels (8 to 14) of the Sima del Elefante cave (TE Lower Red Unit). These are the first bona fide examples of this taxon in the north of the Iberian peninsula. The Lower Red Unit of the Sima del Elefante dates from the early Pleistocene and contains evidence of the very first human activity in the European continent, in the form of lithic tools and large mammal bones with cutmarks.
After a detailed discussion of systematic considerations, we focus on the palaeoecological and palaeobiogeographical implications of the presence of this species in the Sima del Elefante¡¦s Lower Red Unit. In palaeoecological terms, as a member of the Neomyini, A. gibberodon would have had a mainly aquatic life and is taken as an indicator of humid environments with a permanent green covering. As for its palaeobiogeographical implications, on the basis of its geographical distribution and morphometric particularities we have reconstructed the biogeography of the genus Asoriculus from its very first record at the end of the Miocene to its extinction shortly before the beginning of the middle Pleistocene.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 112, No 2
Index theorem on $T^2/\mathbb{Z}_N$ orbifolds
Creators: name: Sakamoto, Makoto
name: Takeuchi, Maki
name: Tatsuta, Yoshiyuki
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate chiral zero modes and winding numbers at fixed points on $T^2/\mathbb{Z}_N$ orbifolds. It is shown that the Atiyah-Singer index theorem for the chiral zero modes leads to a formula $n_+-n_-=(-V_++V_-)/2N$, where $n_{\pm}$ are the numbers of the $\pm$ chiral zero modes and $V_{\pm}$ are the sums of the winding numbers at the fixed points on $T^2/\mathbb{Z}_N$. This formula is complementary to our zero-mode counting formula on the magnetized orbifolds with non-zero flux background $M \neq 0$, consistently with substituting $M = 0$ for the counting formula $n_+ - n_- = (2M - V_+ + V_-)/2N$.
description: 33 pages, 3 figures
РОЛЬ ОПОРНО-ДВИГАТЕЛЬНОГО АППАРАТА В ВЫПОЛНЕНИИ ФИЗИЧЕСКИХ УПРАЖНЕНИЙ
Creators: name: Мардонов Анваржон Шерзодович  студент Ташкентский государственный стоматологический  институт (ТГСИ) Министерство здравоохранения Республики Узбекистан г.Ташкент
name: Научный руководитель:Хайдарова Барно Исраилжановна Старший преподаватель кафедры анатомии Ташкентский государственный стоматологический институт (ТГСИ) Министерство здравоохранения республики Узбекистан г.Ташкент
Publisher: name: Zenodo
Year: 2024

description: В данной статье отражены основные функции опорно-двигательного аппарата при выполнении физических упражнений различной сложности и в целом для развития всего организма. Рассматривается значение и роль опорно-двигательного аппарата для поддержания здоровья, а также даны некоторые общие рекомендации по профилактике нарушений.
PROPOTAMOCHOERUS SP. (SUIDAE, MAMMALIA) FROM THE LATE MIOCENE OF GRAVITELLI (MESSINA, SICILY, ITALY) REDISCOVERED
Creators: name: GALLAI, GIANNI
name: ROOK, LORENZO
Publisher: name: Università degli Studi di Milano
Year: 2006

description: This paper describes two casts of a suid from the Late Miocene of Gravitelli (Messina, Sicily), originally described by Seguenza in 1902. The entire Gravitelli faunal collection was lost in the early 1900¡¦s. The recent rediscovery of two casts in the collections of the Museo di Storia Naturale of the University of Florence represent the only available material from this locality (in addition to the original description and illustration by Seguenza). The study of these casts allow a revision of the Gravitelli suid and its attribution to the genus Propotamochoerus. Although a specific determination is not possible, we suggest probable affinities with the species P. hysudricus or P. provincialis.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 112, No 2
MRI-guided HIFU Methods for the Ablation of Liver and Renal Cancers
Creators: name: de Senneville, Baudouin Denis
name: Moonen, Chrit
name: Ries, Mario
Publisher: name: arXiv
Year: 2020
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: MRI-guided High Intensity Focused Ultrasound (MRI-HIFU) is a promising method for the non-invasive ablation of pathological tissue in many organs, including mobile organs such as liver and kidney. The possibility to locally deposit thermal energy in a non-invasive way opens a path towards new therapeutic strategies with improved reliability and reduced associated trauma, leading to improved efficacy, reduced hospitalization and costs. Liver and kidney tumors represent a major health problem because not all patients are suitable for curative treatment with surgery. Currently, radio-frequency is the most used method for percutaneous ablation. The development of a completely non-invasive method based on MR guided high intensity focused ultrasound (HIFU) treatments is of particular interest due to the associated reduced burden for the patient, treatment related patient morbidity and complication rate. The objective of MR-guidance is hereby to control heat deposition with HIFU within the targeted pathological area, despite the physiological motion of these organs, in order to provide an effective treatment with a reduced duration and an increased level of patient safety. Regarding this, several technological challenges have to be addressed: Firstly, the anatomical location of both organs within the thoracic cage requires inter-costal ablation strategies, which preserve the therapeutic efficiency, but prevent undesired tissue damage to the ribs and the intercostal muscle. Secondly, both therapy guidance and energy deposition have to be rendered compatible with the continuous physiological motion of the abdomen.
description: 28 pages, 6 figures
TAXONOMY OF VISEAN MARINE CALCAREOUS ALGAE, FERNIE, BRITISH COLUMBIA (CANADA)
Creators: name: MAMET, BERNARD
Publisher: name: Università degli Studi di Milano
Year: 2006

description: Reports a diverse microflora from the Late Viséan Opal Member, Fernie, Rocky Mountains, Canada.  A shallow-water limestone level yields forty identifiable taxa of green and red algae associated with  microproblematica.  Four  species are new :  Cabrieropora opalae, Cribrokamaena ferniensis, Koninckopora pachytheca and Moravammina ? enigmatica.  Inferred sedimentation is open marine, in normal salinity, from the middle part of the euphotic zone, within the fair-weather wave zone.  A semi-restricted lagoon located nearby provides floated calcispheres.  The high diversity is due to the excellent preservation of the thalli which were protected by a thin early coating of bacterial micrite.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 112, No 3
Low rank perturbations of quaternion matrices
Creators: name: Mehl, Christian
name: Ran, André
Publisher: name: Technische Universität Berlin
Year: 2017
Subjects: subject: 510 Mathematik
subject: quaternions
subject: eigenvalues
subject: perturbation theory
subject: low rank perturbations

description: Low rank perturbations of right eigenvalues of quaternion matrices are considered. For real and complex matrices it is well known that under a generic rank-k perturbation the k largest Jordan blocks of a given eigenvalue will disappear while additional smaller Jordan blocks will remain. In this paper, it is shown that the same is true for real eigenvalues of quaternion matrices, but for complex nonreal eigenvalues the situation is different: not only the largest k, but the largest 2k Jordan blocks of a given eigenvalue will disappear under generic quaternion perturbations of rank k. Special emphasis is also given to Hermitian and skew-Hermitian quaternion matrices and generic low rank perturbations that are structure-preserving.
Deterministic Entanglement via Molecular Dissociation in Integrated Atom Optics
Creators: name: Zhao, Bo
name: Chen, Zeng-Bing
name: Pan, Jian-Wei
name: Schmiedmayer, J.
name: Recati, Alessio
name: Astrakharchik, Grigory E.
name: Calarco, Tommaso
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Deterministic entanglement of neutral cold atoms can be achieved by combining several already available techniques like the creation/dissociation of neutral diatomic molecules, manipulating atoms with micro fabricated structures (atom chips) and detecting single atoms with almost 100% efficiency. Manipulating this entanglement with integrated/linear atom optics will open a new perspective for quantum information processing with neutral atoms.
description: 4 pages, 3 figures