cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Axisymmetric Charge-Conservative Electromagnetic Particle Simulation Algorithm on Unstructured Grids: Application to Microwave Vacuum Electronic Devices
Creators: name: Na, Dong-Yeop
name: Omelchenko, Yuri A.
name: Moon, Haksu
name: Borges, Ben-Hur V.
name: Teixeira, Fernando L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We present a 2.5-dimensional charge-conservative electromagnetic particle-in-cell (EM-PIC) algorithm optimized for the analysis of vacuum electronic devices (VED) with cylindrical symmetry (axisymmetry). We explore the axisymmetry present in the device geometry, fields, and sources to reduce the dimensionality of the problem from 3D to 2D. Further, we explore `transformation optics' principles to map the original problem in polar coordinates to an equivalent problem on Cartesian coordinates with an effective (artificial) inhomogeneous medium introduced. The resulting problem in the meridian plane is discretized using an unstructured 2D mesh considering TE-polarized fields and properly scaled charges. EM field and source variables (node-based charges and edge-based currents) are expressed as differential forms of various degrees, and discretized using Whitney forms. Using leapfrog time integration, we obtain a mixed finite-element time-domain scheme for the full-discrete Maxwell's equations. We achieve a local and explicit time-update for the field equations by employing the sparse approximate inverse (SPAI) algorithm. Interpolating field values to particles' positions for solving Newton-Lorentz equations of motion is also done via Whitney forms. Particles are advanced using the Boris algorithm with a relativistic correction. In the scatter step, we apply a radial scaling factor on top of a charge-conserving scatter scheme tailored for 2-dimensional unstructured grids. As validation examples, we demonstrate simulations that investigate the physical performance of VEDs designed to harness particle bunching effects arising from the coherent (resonance) Cerenkov electron beam interactions within micromachined slow-wave structures.
description: 34 pages, 19 figures
Exact ordering of energy levels for one-dimensional interacting Fermi gases with $SU(n)$ symmetry
Creators: name: Pan, Lei
name: Liu, Yanxia
name: Hu, Haiping
name: Zhang, Yunbo
name: Chen, Shu
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Based on the exact solution of one-dimensional Fermi gas systems with $SU(n)$ symmetry in a hard wall, we demonstrate that we are able to sort the ordering of the lowest energy eigenvalues of states with all allowed permutation symmetries, which can be solely marked by certain quantum numbers in the Bethe ansatz equations. Our results give examples beyond the scope of the generalized Lieb-Mattis theorem, which can only compare the ordering of energy levels of states belonging to different symmetry classes if they are comparable according to the pouring principle. In the strongly interacting regime, we show that the ordering of energy levels can be determined by an effective spin-exchange model and extend our results to the non-uniform system trapped in the harmonic potential.
description: 6 pages, 4 figures
title: From images To changes: enhancing synthetic aperture radar change detection via registration and deep despeckling model
Creators: name: Ihmeida, Mohamed
Publisher: name: University of Reading
Year: 2024

description: Change Detection (CD) in Synthetic Aperture Radar (SAR) is an essential task in the field
of Earth Observation (EO). It focuses on identifying the change for the same geographical
region between two SAR images acquired at different times. SAR offers several advantages
over optical sensors. For instance, spaceborne SAR sensors are able to provide day/night
capability to map the globe in virtually all weather conditions. Moreover, SAR’s microwave
signals can pass through the cloud cover, allowing it to acquire data and generate images even
in the presence of clouds, fog and dust. Despite these advantages of SAR, CD in SAR remains
a highly challenging problem due to the misregistration of multi-temporal SAR images and
speckle noise. Both these challenges adversely affect the performance of SAR-based CD
techniques. In this thesis research, we have thoroughly discussed these challenges and have
proposed novel solutions to improve the overall performance of SAR-based CD algorithms.
For instance, we have proposed a deep neural network-based despeckling model (DM)
that effectively suppresses speckle noise and enhances the performance of the existing CD
methods. Specifically, the proposed despeckling methodology consists of two modules where
the first despeckling module passes the input SAR image through a series of convolutional
layers to suppress speckle noise and later feeds the resulting noise-reduced image to the
subsequent change detection module.
For change detection, we initiate a preclassification step employing the logarithmic ratio
operator and the hierarchical FCM algorithm. Subsequently, we utilise a layer attention
module that exploits correlations among multi-layer convolutions. This module produces robust cascaded feature representations learned by the network. These robust representations
not only allow the proposed despeckling architecture to be resilient to multi-temporal SAR
acquired from one SAR imaging process (i.e., the same number of SAR images looks before
and after the change) but also enable it to deal with any combination of single or multi-look
images acquired prior and after the change. In addition to this despeckling model, we have
also developed a robust loss function that effectively suppresses the speckle noise, thereby
improving the change detection accuracy. Both the despeckling model and the proposed
noise-tolerant loss function are evaluated extensively on three public real SAR datasets,
achieving superior performance compared to existing state-of-the-art SAR CD methods in
all benchmark datasets.
\emph{Ab initio} theory of $\text{N}_{2}\text{V}$ defect as quantum memory in diamond
Creators: name: Udvarhelyi, Péter
name: Thiering, Gergő
name: Londero, Elisa
name: Gali, Adam
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: $\text{N}_{2}\text{V}$ defect in diamond is characterized by means of \emph{ab initio} methods relying on density functional theory calculated parameters of a Hubbard model Hamiltonian. It is shown that this approach appropriately describes the energy levels of correlated excited states induced by this defect. By determining its critical magneto-optical parameters, we propose to realize a long-living quantum memory by $\text{N}_{2}\text{V}$ defect in diamond.
description: 4 figures and 5 tables
Impact of COVID-19 critical illness on functional status, fatigue symptoms, and health-related quality of life one-year after hospital discharge: a systematic review and meta-analysis
Creators: name: Gesser, Ana Flávia
name: Campos, Mariana Lanzoni
name: Artismo, Regiana Santos
name: Karloh, Manuela
name: Matte, Darlan Laurício
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer
subject: Science Policy
subject: Mental Health

description: To estimate the prevalence and severity of impairments in functional status, fatigue, and health-related quality of life (HRQoL) among critical COVID-19 survivors one-year after hospital discharge. A systematic review was conducted following PRISMA statement and registered in PROSPERO (CRD42021258356), with searches in eight databases. Observational studies were selected. The prevalence meta-analysis of abnormalities was performed using random-effects models. Risk of bias was evaluated using the National Heart, Lung, and Blood Institute tool. Twenty studies were included, with data collected between 12 and 13.5 months after hospital discharge and a total of 1828 participants. Of these, 71% were men, and 77.7% were intubated in the intensive care unit (ICU). Impairments and sequelae were identified in varying prevalence and degrees, with greater impact on functional capacity and physical components of fatigue and HRQoL. The prevalence of abnormalities of 32.3% [95% CI 23.9; 41.9] found in the meta-analysis is substantially high. Most studies were classified as having fair and poor quality. Critical COVID-19 survivors experience impairments in functional status, fatigue, and HRQoL to varying degrees one-year after hospital discharge, particularly among patients who stayed in the ICU and on MV for a prolonged period. Critical COVID-19 survivors exhibit persistent impairments one-year post-discharge. Functional status, fatigue, and health-related quality of life are impaired to varying degrees in approximately one-third of patients. Long-term follow-up care for critical COVID-19 survivors should be prioritized.
High-Order Multipole Radiation from Quantum Hall States in Dirac Materials
Creators: name: Gullans, Michael J.
name: Taylor, Jacob M.
name: Imamoglu, Atac
name: Ghaemi, Pouyan
name: Hafezi, Mohammad
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the optical response of strongly disordered quantum Hall states in two-dimensional Dirac materials and find qualitatively different effects in the radiation properties of the bulk versus the edge. We show that the far-field radiation from the edge is characterized by large multipole moments (> 50) due to the efficient transfer of angular momentum from the electrons into the scattered light. The maximum multipole transition moment is a direct measure of the coherence length of the edge states. Accessing these multipole transitions would provide new tools for optical spectroscopy and control of quantum Hall edge states. On the other hand, the far-field radiation from the bulk appears as random dipole emission with spectral properties that vary with the local disorder potential. We determine the conditions under which this bulk radiation can be used to image the disorder landscape. Such optical measurements can probe sub-micron length scales over large areas and provide complementary information to scanning probe techniques. Spatially resolving this bulk radiation would serve as a novel probe of the percolation transition near half-filling.
description: v2: 8 pages, 4 figures
POSSIBILITY OF USING BAMBOO AND HIGH TENACITY POLYESTER (HTPET) NET FABRIC AS REINFORCEMENT OF CONCRETE SLABS.pdf
Creators: name: Mohie Eldin, Mohammad
Publisher: name: figshare
Year: 2022
Subjects: Structural engineering

description: Bamboo is a natural fabric that is considered as environment friendly material of cheap fabricating cost considering both processing and production through a low degree of industrialization. Bamboo shells can be considered as an orthotropic material of high strength in the longitudinal direction and low strength in the transverse one. As a result, Bamboo was proposed as reinforcement for concrete structures. On the other hand, high tenacity Polyester fabrics are industrial fabrics have a lot of advantages for example; high strength to weight ratio and low cost of fabricating. So, High Tenacity Polyester (HTPET) net fabrics have the ability to undergo high tension stresses and as a result it is used as tire chords in automobiles manufacturing. The purpose of this paper was to examine the possibility of using untreated Bamboo and HTPET net fabrics as reinforcement of concrete slabs. This possibility was investigated through an experimental program for testing of concrete slabs reinforced using Bamboo rods, steel bars, and HTPET net fabrics. It was found that using of Bamboo rods as reinforcement of concrete slabs is promising. However, untreated Bamboo rods are not required since they behave linearly as a general and cause brittle failure of slabs. On the other hand, HTPET net fabrics were found very effective in improving the behavior of Bamboo-reinforced concrete slabs.
Entropy-power uncertainty relations : towards a tight inequality for all Gaussian pure states
Creators: name: Hertz, Anaelle
name: Jabbour, Michael G.
name: Cerf, Nicolas J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that a proper expression of the uncertainty relation for a pair of canonically-conjugate continuous variables relies on entropy power, a standard notion in Shannon information theory for real-valued signals. The resulting entropy-power uncertainty relation is equivalent to the entropic formulation of the uncertainty relation due to Bialynicki-Birula and Mycielski, but can be further extended to rotated variables. Hence, based on a reasonable assumption, we give a partial proof of a tighter form of the entropy-power uncertainty relation taking correlations into account and provide extensive numerical evidence of its validity. Interestingly, it implies the generalized (rotation-invariant) Schrödinger-Robertson uncertainty relation exactly as the original entropy-power uncertainty relation implies Heisenberg relation. It is saturated for all Gaussian pure states, in contrast with hitherto known entropic formulations of the uncertainty principle.
description: 15 pages, 5 figures, the new version includes the n-mode case
“Activity Matters was great - I now realize: if I move, I’m fitter.”: development and process evaluation of a web-based program for persons with multiple sclerosis
Creators: name: Daniel, N.
name: Bruns, I.
name: Casey, B.
name: Coote, S.
name: Daubmann, A.
name: Heesen, C.
name: Riemann-Lorenz, K.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Mental Health

description: Research shows that persons with mild to moderate multiple sclerosis are less physically active than healthy controls even though they would benefit from it. This study focusses on the feasibility testing and process evaluation of the pilot study of Activity Matters, a twelve-week web-based program, from Ireland, to increase physical activity in this population. The intervention was adapted to local circumstances in Hamburg, Germany and consists of eleven modules incorporating behavior change techniques. After feasibility had been confirmed, 43 persons with multiple sclerosis participated in a pilot study with a pre-post, single-group intervention design. Qualitative data was collected with questionnaires and semi structured interviews. Physical activity level and stage of change was measured quantitatively. Participants had a mean age of 49.5 years (SD 9.29) and an average Patient Determined Disease Step Score of 2.2 (SD 1.47). Thirty-six participants answered the follow-up questionnaire. On average 9.8 modules were processed within 13 weeks. Each tool for behavior change was perceived as helpful except the chat group. Physical activity levels increased significantly from pre- to post intervention (p-value 0.042, Cohen’s d = 0.35). The results indicate that Activity Matters is feasible and satisfactory and may change activity levels. Activity Matters provides a twelve-week web-based self-management program to increase PA which is feasible and well accepted by middle aged, mild to moderately impaired persons with MS.Persons with MS in this online program were pleased with the overall content and the self-regulation strategies, however some were seeking for more personal contact and interaction with the study team and other participants.Stronger individualisation of web-based programs to the diverse needs of participants remains a challenge that has to be solved in the future. Activity Matters provides a twelve-week web-based self-management program to increase PA which is feasible and well accepted by middle aged, mild to moderately impaired persons with MS. Persons with MS in this online program were pleased with the overall content and the self-regulation strategies, however some were seeking for more personal contact and interaction with the study team and other participants. Stronger individualisation of web-based programs to the diverse needs of participants remains a challenge that has to be solved in the future.
Exploring post-stroke fatigue from the perspective of stroke survivors: what strategies help? A qualitative study
Creators: name: Delbridge, Alex
name: Davey, Julie
name: Galloway, Margaret
name: Drummond, Avril
name: Lanyon, Lucette
name: Olley, Natasha
name: Mason, Gillian
name: English, Coralie
name: Simpson, Dawn B.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Science Policy
subject: Mental Health

description: Post-stroke fatigue is a research priority for stroke survivors and health professionals but there is limited evidence to guide management. We aimed to explore (1) the experience of post-stroke fatigue from the perspective of stroke survivors and their caregivers and (2) fatigue management strategies that are used. This was a qualitative study using semi-structured interviews. People with self-reported post-stroke fatigue and caregivers were recruited using maximum variation sampling. Analysis was done via the framework approach. We recruited 17 stroke survivors, nine male (53%), most under 65 years (n = 12, 76%), and greater than 1-year post-stroke (n = 16, 94%, range 10-months to 22-years). One-third of participants self-reported having aphasia (n = 5, 36%). We also recruited eight caregivers, most of whom were female (n = 7, 88%). We identified four themes: (1) fatigue is unexpected after stroke and symptoms vary; (2) the individual experience of fatigue is complex, influenced by multifactorial and biopsychosocial factors; (3) learning to adapt and accept fatigue; and (4) Strategies to manage fatigue and personal approaches to rest. Post-stroke fatigue experience varies presenting cognitively, physically, and psychologically according to a complex interplay of biopsychosocial factors and personal triggers. Self-management strategies are individualised and include organisation, medications, lifestyle modifications, and peer support. Post-stroke fatigue is a complex individual experience involving biopsychosocial factors, and stroke survivors need assistance to identify their triggers and support from family, peers, and the stroke community to live well with fatigue. Fatigue is not commonly discussed by health professionals and stroke survivors need simple, practical advice over the long-term to reduce fear and distress. There are a range of strategies that may be helpful. Stroke survivors may benefit from adopting problem-solving approaches, trial pacing, lifestyle modifications and planning, and find forms of rest that work for them.
Color Dipole picture at Low-x DIS: The Mass Range of Active Photon Fluctuations
Creators: name: Kuroda, M.
name: Schildknecht, D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the mass range of the quark-antiquark fluctuations of the photon that are active in producing the total photoabsorption cross section in the color dipole picture, emphasizing the notion of color transparency and saturation. We consider the implications of measurements at future extensions of the available electron-proton-scattering energy.
description: 5 pages, 3 figure., Minor changed of sentences and Appendix A and B added
The role of the strain induced population imbalance in Valley polarization of graphene: Berry curvature perspective
Creators: name: Farajollahpour, Tohid
name: Phirouznia, Arash
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Real magnetic and lattice deformation gauge fields have been investigated in honeycomb lattice of graphene. The coexistence of these two gauges will induce a gap difference between two valley points ($K$ and $K'$) of system. This gap difference allows us to study the possible topological valley Hall current and valley polarization in the graphene sheet. In the absence of magnetic field, the strain alone could not generate a valley polarization when the Fermi energy coincides exactly with the Dirac points. Since in this case there is not any imbalance between the population of the valley points. In other words each of these gauges alone could not induce any topological valley-polarized current in the system at zero Fermi energy. Meanwhile at non-zero Fermi energies population imbalance can be generated as a result of the external strain even at zero magnetic field. In the context of Berry curvature within the linear response regime the valley polarization (both magnetic free polarization, $Π_0$, and field dependent response function, $χ_α$) in different values of gauge fields of lattice deformation has been obtained.
Pairing Tendencies in a Two-orbital Hubbard Model in One Dimension
Creators: name: Patel, N. D.
name: Nocera, A.
name: Alvarez, G.
name: Moreo, A.
name: Dagotto, E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The recent discovery of superconductivity under high pressure in the ladder compound BaFe$_2$S$_3$ has opened a new field of research in iron-based superconductors with focus on quasi one-dimensional geometries. In this publication, using the Density Matrix Renormalization Group technique, we study a two-orbital Hubbard model defined in one dimensional chains. Our main result is the presence of hole binding tendencies at intermediate Hubbard $U$ repulsion and robust Hund coupling $J_H/U=0.25$. Binding does not occur neither in weak coupling nor at very strong coupling. The pair-pair correlations that are dominant near half-filling, or of similar strength as the charge and spin correlation channels, involve hole-pair operators that are spin singlets, use nearest-neighbor sites, and employ different orbitals for each hole. The Hund coupling strength, presence of robust magnetic moments, and antiferromagnetic correlations among them are important for the binding tendencies found here.
Intersecting Surface Defects and Instanton Partition Functions
Creators: name: Pan, Yiwen
name: Peelaers, Wolfger
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze intersecting surface defects inserted in interacting four-dimensional N = 2 supersymmetric quantum field theories. We employ the realization of a class of such systems as the infrared fixed points of renormalization group flows from larger theories, triggered by perturbed Seiberg-Witten monopole-like configurations, to compute their partition functions. These results are cast into the form of a partition function of 4d/2d/0d coupled systems. Our computations provide concrete expressions for the instanton partition function in the presence of intersecting defects and we study the corresponding ADHM model.
description: 66 pages; v2: minor typos corrected
Optimum CFRP Length for the Hogging Moment Zone (HMZ) of Continuous RC T-Beams
Creators: name: Mohie Eldin, Mohammad
Publisher: name: figshare
Year: 2022
Subjects: Structural engineering

description: Carbon fiber reinforced polymer (CFRP) laminates were proved as very effective method for either repairing or strengthening of used structures. However, the literature has no enough information about the behavior of RC continuous (two-span) T-section beams strengthened with CFRP laminates, especially in hogging moment zone (HMZ). This paper examines the effect of CFRP laminates lengths, used for strengthening of the hogging moment zone, upon the behavior of such beams, to determine the optimum strengthening length.3-D theoretical models using the Finite Element (FE) Package ANSYS are used. The paper contains the main details of the FE modeling process; used element types, material properties, meshing, yield criterion and boundary conditions. The results of the proposed FE model were compared with those of a previous experimental research and very good agreement was found between both FE and experimental results. Three parameters were used in the parametric study; CFRP length, CFRP thickness, percentage ratio of the steel reinforcement (different diameters for reinforcement steel bars). To examine the effect of changing CFRP strengthening lengths, different types of results for the proposed parametric study were obtained for better understanding of behavior. Adding to this, these results were compared and analyzed at different stages of loading between first cracking of the RC studied T-beams and their failure. These results include load-deflection curves, bending moment diagrams, stresses and strains of the CFRP laminates, stresses and strains of steel reinforcement bars, redistribution of moments, energy dissipation, ductility, shear (bond) stresses and failure modes of the studied beams. It can be concluded that changing CFRP length in the HMZ is very effective upon the overall behavior of T-section continuous RC beams. This effect begins after first crack and considered as effective after the yielding of upper steel bars. Increasing the lengths of CFRP laminates increases capacity,ductility and energy dissipation of strengthened beams in the hogging moment zone. Also, it improves utilizing of upper steel bars and redistribution of moments between sagging and hogging moments. Practically, Design-Codes of using CFRP in strengthening of structures concern only with both CFRP strengthening length and its corresponding anchorage length. As a result, definitions of both optimum CFRP strengthening length and CFRP anchorage length were expressed. Finally, criteria to calculate both of them were concluded.
Responsiveness of specific and generic patient-reported outcome measures in patients with plantar fasciopathy
Creators: name: Heide, Marte
name: Mørk, Marianne
name: Hoksrud, Aasne Fenne
name: Brox, Jens Ivar
name: Røe, Cecilie
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: To evaluate and compare responsiveness characteristics for the Foot Function Index revised short form (FFI-RS), RAND-12 Health Status Inventory (RAND-12), and Numeric Rating Scale (NRS), in patients with plantar fasciopathy receiving non-surgical treatment. This study was conducted on a sub-group of patients from an ongoing randomised controlled trial. One-hundred fifteen patients were included. The patient-reported outcome measures (PROMs) were applied at baseline and after 6 months. Responsiveness was calculated using standardised response mean and area under the receiver operating characteristic (ROC) curve. ROC curves were used to compute the minimal important change (MIC) for the outcome measures. The region specific FFI-RS had best responsiveness and the NRS at rest had lowest responsiveness. FFI-RS were marginally more responsive than the other PROMs. Responsiveness and MIC estimates should be regarded as indicative rather than fixed estimates. The region-specific Foot Function Index Revised Short Form could, based on responsiveness perspectives, be recommended as an outcome measurement for patients with plantar fasciopathy.Responsiveness and minimal important change estimates are indicative and should be interpreted with caution. The region-specific Foot Function Index Revised Short Form could, based on responsiveness perspectives, be recommended as an outcome measurement for patients with plantar fasciopathy. Responsiveness and minimal important change estimates are indicative and should be interpreted with caution.
Truthful Mechanisms for Delivery with Mobile Agents
Creators: name: Bärtschi, Andreas
name: Graf, Daniel
name: Penna, Paolo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: F.2

description: We study the game-theoretic task of selecting mobile agents to deliver multiple items on a network. An instance is given by $m$ messages (physical objects) which have to be transported between specified source-target pairs in a weighted undirected graph, and $k$ mobile heterogeneous agents, each being able to transport one message at a time. Following a recent model by [Bärtschi et al. 2016], each agent $i$ consumes energy proportional to the distance it travels in the graph, where the different rates of energy consumption are given by weight factors $w_i$. We are interested in optimizing or approximating the total energy consumption over all selected agents. Unlike previous research, we assume the weights to be private values known only to the respective agents. We present three different mechanisms which select, route and pay the agents in a truthful way that guarantees voluntary participation of the agents, while approximating the optimum energy consumption by a constant factor. To this end we analyze a previous structural result and an approximation algorithm given by [Bärtschi et al. 2017]. Finally, we show that for some instances in the case of a single package, the sum of the payments can be bounded in terms of the optimum.
description: 17 pages. An extended abstract of this paper will be published at the Workshop on Algorithmic Approaches for Transportation Modeling, Optimization, and Systems 2017, ATMOS'17
Molecular Dynamics Simulation of Vascular Network Formation
Creators: name: Buttà, Paolo
name: Cerreti, Fiammetta
name: Servedio, Vito D. P.
name: Triolo, Livio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Endothelial cells are responsible for the formation of the capillary blood vessel network. We describe a system of endothelial cells by means of two-dimensional molecular dynamics simulations of point-like particles. Cells' motion is governed by the gradient of the concentration of a chemical substance that they produce (chemotaxis). The typical time of degradation of the chemical substance introduces a characteristic length in the system. We show that point-like model cells form network resembling structures tuned by this characteristic length, before collapsing altogether. Successively, we improve the non-realistic point-like model cells by introducing an isotropic strong repulsive force between them and a velocity dependent force mimicking the observed peculiarity of endothelial cells to preserve the direction of their motion (persistence). This more realistic model does not show a clear network formation. We ascribe this partial fault in reproducing the experiments to the static geometry of our model cells that, in reality, change their shapes by elongating toward neighboring cells.
description: 10 pages, 3 figures, 2 of which composite with 8 pictures each. Accepted on J.Stat.Mech. (2009). Appeared at the poster session of StatPhys23, Genoa, Italy, July 13 (2007)
title: Non-financial Energy Saving policies for households. A comparative Analysis.
Creators: name: Wimmer, Rupert
Publisher: name: TU Wien
Year: 2023
Subjects: subject: production
subject: wind
subject: energy
subject: policies
subject: challenges

description: This thesis titled “Non-financial Energy Saving Policies for Austrian households. AComparative Analysis” contains a comprehensive literature review, of clarifying the stateof the art on the nature and definition of public policies as such.Secondly, it addresses the concept of energy saving policies for households and how theycan be designed.Thirdly, it goes into more detail on what can be understood by non-monetary or nonfinancialenergy saving policies and which methods have already been applied. Based onthe literature research, a theoretical framework of nudging according to Richard Thalerand Cass Sunstein is developed.In the empirical part, the energy saving campaigns for households of the D-A-CHcountries (Germany, Austria, Switzerland) were comparatively analyzed and interpreted.Finally, conclusions are drawn by comparing the efforts of these countries and academicliterature. Recommendations for possible future energy saving policies in Austria aremade based on behavioral economics.
Thrinchostoma (Diagonozus) lettowvorbecki Bluthgen 1930
Creators: name: Pauly, Alain
name: Eardley, Connal
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Halictidae
Thrinchostoma
Thrinchostoma lettowvorbecki

description: Thrinchostoma (Diagonozus) lettowvorbecki Blüthgen, 1930
(Figs 16, 17, 18, 19b)
 Thrincostoma [!] (Diagonozus) lettow-vorbecki Blüthgen, 1930: 497, 499, 503, 522, 536, ♂, ♀.
 Male holotype: R.D. Congo, Barumbu, 12.XI.1913, sur fleurs de Costus n°1169, leg. Dr. Bequaert (RMCA).
 Thrinchostoma (Diagonozus) lettow-vorbecki Blüthgen: Michener, 1978: 525.
 Thrinchostoma lettow-vorbecki Blüthgen: Cockerell, 1933: 24.
 Thrinchostoma (Diagonozus) lettowvorbecki (Blüthgen): Pauly, 1999: 156, 174.
 Thrincostoma [!] (Diagonozus) guineense Blüthgen, 1930: 536, ♂. Male holotype: Equatorial Guinea « Spanish Guinea », Uelleburg, Benitogebiet, 1-14.II.1907, leg. Tessmann (MNHUB). Syn. nov.
 Thrinchostoma (Diagonozus) guineensis Blüthgen: Michener, 1978: 525; Pauly, 1999: 156, 173.
 Thrinchostoma (Diagonozus) ghesquieri Cockerell, 1933: 24, ♂. Male holotype: R.D. Congo, Yangambi, I.1925, leg. Lt. J. Ghesquière (RMCA). Michener, 1978: 525; Pauly 1999: 156, 173, syn.; Michener, 2000: 374.
 NOTE: According to BLÜTHGEN (1930) T. guineensis may be simply a variety of T. lettowvorbecki and we preferred to consider it as a synonym because the differences are minimal.
 DIAGNOSIS. The male differs from T. bicometes only by segments 8 to 11 of the antennae having notches and by the antennae being with fewer curved segments. The female differs from all other Thrinchostoma by its long malar area (fig. 18a).
MATERIAL.
IVORY COAST. Guiglo, Park National de Taï, 12 km E. of Pauleoula, 20.VIII.1983, 1♀, leg. R.T.A. Schouten & J.R.M. Buijsen (ITZA).
 D.R. CONGO. Barumbu, 12.XI.1913, sur fleurs de Costus n°1169, 1♀ (paratype), leg. Dr. Bequert (RMCA). – Eala, 7.VIII.1935, 1♂, leg. J. Ghesquière (RMCA).
CONGO-BRAZZAVILLE. Odzala, Bordure de route près cases abandonnées, 8.II.1977, 1♂, leg. S. Kelner Pillault (MNHNP).
description: Published as part of Pauly, Alain & Eardley, Connal, 2013, A Revision of Afrotropical Thrinchostoma de Saussure, 1890 (Hymenoptera: Apoidea: Halictidae), pp. 1-76 in Belgian Journal of Entomology 12 on pages 15-16, DOI: 10.5281/zenodo.13486944
Directed current in quasi-adiabatically ac-driven nonlinear systems
Creators: name: Buttà, Paolo
name: Negrini, Piero
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 82C70, 70K05

description: We rigorously prove the existence of directed transport for a certain class of ac-driven nonlinear one dimensional systems, namely the generation of transport with a preferred direction in the absence of a net driving force.
description: 13 pages (one misprint has been corrected)
A short proof of Cayley's tree formula
Creators: name: Shukla, Alok Bhushan
Publisher: name: arXiv
Year: 2009
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C05

description: We give a short proof of Cayley's tree formula for counting the number of different labeled trees on $n$ vertices. The following nonlinear recursive relation for the number of labeled trees on $n$ vertices is deduced from a combinatorial argument, $$ T_n = \frac{n}{2} \sum_{k=0}^{n-2} \left ( \begin {array} {c} n-2 \\ k \end {array} \right ) T_{k+1} T_{n-k-1}; \ \ for \ n > 1 \ and \ T_1 = 1, $$ and then it is proved that $T_n = n^{n-2}$, which gives yet another proof of the celebrated Cayley's tree formula.
description: 4 pages, 2 figures
Gross-Pitaevskii non-linear dynamics for pseudo-spinor condensates
Creators: name: Michelangeli, Alessandro
name: Olgiati, Alessandro
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35J10, 35Q40, 35Q55, 35Q70, 81-05, 81Q0, 81U05, 81V70, 82C10

description: We derive the equations for the non-linear effective dynamics of a so called pseudo-spinor Bose-Einstein condensate, which emerges from the linear many-body Schrödinger equation at the leading order in the number of particles. The considered system is a three-dimensional diluted gas of identical bosons with spin, possibly confined in space, and coupled with an external time-dependent magnetic field; particles also interact among themselves through a short-scale repulsive interaction. The limit of infinitely many particles is monitored in the physically relevant Gross-Pitaevskii scaling. In our main theorem, if at time zero the system is in a phase of complete condensation (at the level of the reduced one-body marginal) and with energy per particle fixed by the Gross-Pitaevskii functional, then such conditions persist also at later times, with the one-body orbital of the condensate evolving according to a system of non-linear cubic Schrödinger equations coupled among themselves through linear (Rabi) terms. The proof relies on an adaptation to the spinor setting of Pickl's projection counting method developed for the scalar case. Quantitative rates of convergence are available, but not made explicit because evidently non-optimal. In order to substantiate the formalism and the assumptions made in the main theorem, in an introductory section we review the mathematical formalisation of modern typical experiments with pseudo-spinor condensates.
description: Corrected typos, updated bibliography
Spin polarization observables of the deuteron photodisintegration at low energies in pionless effective field theory
Creators: name: Song, Young-Ho
name: Ando, Shung-Ichi
name: Hyun, Chang Ho
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Spin polarization observables of the deuteron photodisintegration at low energies are studied in a pionless effective field theory up to next-to-next-to-leading order (NNLO). The total and differential cross sections, induced neutron polarization $P_{y'}$, and tensor analyzing powers $T_{20}$ and $T_{22}$ of the process are calculated at photon energies from the breakup threshold to 20~MeV. We find that the NNLO corrections in the cross sections and $P_{y'}$ converge well whereas they turn out to be important contributions in $T_{20}$ and $T_{22}$. We discuss the discrepancy between theory and experiment in $P_{y'}$ still persisting as well as an implication of our result to the first measurement of $T_{20}$ at low energies in the HIGS facility.
description: To be published in Physical Review C
Speedy motions of a body immersed in an infinitely extended medium
Creators: name: Buttà, P.
name: Ferrari, G.
name: Marchioro, C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 70F40, 70B05, 70F45

description: We study the motion of a classical point body of mass M, moving under the action of a constant force of intensity E and immersed in a Vlasov fluid of free particles, interacting with the body via a bounded short range potential Psi. We prove that if its initial velocity is large enough then the body escapes to infinity increasing its speed without any bound "runaway effect". Moreover, the body asymptotically reaches a uniformly accelerated motion with acceleration E/M. We then discuss at a heuristic level the case in which Psi(r) diverges at short distances like g r^{-a}, g,a>0, by showing that the runaway effect still occurs if a<2.
description: 15 pages
Energy scale calibration of KEDR detector tagging system
Creators: name: Kaminskiy, V. V.
name: Muchnoi, N. Yu.
name: Zhilich, V. N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The tagging system of the KEDR detector is a symmetrical focusing magnetic spectrometer for electrons and positrons scattered at small angles; it is embedded into the lattice of the VEPP-4M collider and intended for two-photon processes study. It measures scattered electron energy with resolution $ΔE/E_0=0.03\%...0.6\%$ ($E_0$ is the beam energy). For precise energy scale calibration two methods are used: tagging of bremsstrahlung electron/positron by the photon energy measured by BGO calorimeter, and direct calibration using Compton backscattering spectrum edge. This report covers design and current status of the calibration system.
description: Proceedings of Instrumentation for Colliding Beam Physics (27 February - 3 March, 2017; Budker Institute of Nuclear Physics, Novosibirsk, Russia) 6 pages, 4 figures
Multiplicity fluctuations near the QCD critical point
Creators: name: Hippert, Maurício
name: Fraga, Eduardo S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Statistical moments of particle multiplicities in heavy-ion collision experiments are an important probe in the exploration of the phase diagram of strongly interacting matter and, particularly, in the search for the QCD critical end point. In order to appropriately interpret experimental measures of these moments, however, it is necessary to understand the role of experimental limitations, as well as background contributions, providing expectations on how critical behavior should be affected by them. We here present a framework for calculating moments of particle multiplicities in the presence of correlations of both critical and spurious origins. We also include effects from resonance decay and a limited acceptance window, as well as detector efficiency. Although we focus on second-order moments, for simplicity, an extension to higher-order moments is straightforward.
description: 13 pages, 7 figures
Alguns subconjuntos de atributos
Creators: name: Autor1
Publisher: name: Zenodo
Year: 2022
Subjects: seleção de atributos filtro
Correlation-based Feature Selection
seleção de subconjuntos de atributos

description: Subconjuntos de atributos selecionados pelas configurações M1 e M2 do método desenvolvido no trabalho "Caracterização e Classificação de Conjuntos Desbalanceados de Dermoscopias"
Supplementary document for Azimuthal backflow in light carrying orbital angular momentum - 6512172.pdf
Creators: name: Ghosh, Bohnishikha
name: daniel, anat
name: Gorzkowski, Bernard
name: Lapkiewicz, Radek
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Mathematical derivations and error analysis
Perspective: Theory and simulation of hybrid halide perovskites
Creators: name: Whalley, Lucy D.
name: Frost, Jarvist M.
name: Jung, Young-Kwang
name: Walsh, Aron
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Organic-inorganic halide perovskites present a number of challenges for first-principles atomistic materials modelling. These `plastic crystals' feature dynamic processes across multiple length-scales and time-scales, which include: (i) transport of slow ions and fast electrons; (ii) highly anharmonic lattice dynamics with short phonon lifetimes; (iii) local symmetry breaking of the average crystallographic space group; (iv) strong relativistic (spin-orbit coupling) effects on the electronic band structure; (v) thermodynamic metastability and rapid chemical breakdown. These issues, which affect the operation of solar cells, are outlined in this perspective. We also discuss general guidelines for performing quantitative and predictive simulations of these materials, which are relevant to metal-organic frameworks and other hybrid semiconducting, dielectric and ferroelectric compounds.
Boundary effects in the gradient theory of phase transitions
Creators: name: Bertini, L.
name: Buttà, P.
name: Garroni, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 82B26, 49J45 (Primary), 35J20, 82B24 (Secondary)

description: We consider the van der Waals' free energy functional, with a scaling small parameter epsilon, in the plane domain given by the first quadrant, and inhomogeneous Dirichlet boundary conditions. The boundary data are chosen in such a way that the interface between the pure phases tends to be horizontal and is pinned at some point on the y-axis which approaches zero as epsilon converges to zero. We show that there exists a critical scaling for the pinning point, such that, as the small parameter epsilon tends to zero, the competing effects of repulsion from the boundary and penalization of gradients play a role in determining the optimal shape of the (properly rescaled) interface. This result is achieved by means of an asymptotic development of the free energy functional. As a consequence, such analysis is not restricted to minimizers but also encodes the asymptotic probability of fluctuations.
description: 20 pages, 1 figure
Non-dipole recollision-gated double ionization and observable effects
Creators: name: Emmanouilidou, A.
name: Meltzer, T.
name: Corkum, P. B.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Using a three-dimensional semiclassical model, we study double ionization for strongly-driven He fully accounting for magnetic field effects. For linearly and slightly elliptically polarized laser fields, we show that recollisions and the magnetic field combined act as a gate. This gate favors more transverse - with respect to the electric field - initial momenta of the tunneling electron that are opposite to the propagation direction of the laser field. In the absence of non-dipole effects, the transverse initial momentum is symmetric with respect to zero. We find that this asymmetry in the transverse initial momentum gives rise to an asymmetry in a double ionization observable. Finally, we show that this asymmetry in the transverse initial momentum of the tunneling electron accounts for a recently-reported unexpectedly large average sum of the electron momenta parallel to the propagation direction of the laser field.
description: Amended the focus of the paper and discussion. 9 pages, 7 figures