cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamics of microswimmers near a liquid-liquid interface with viscosity difference
Creators: name: Feng, Chao
name: Molina, John J.
name: Turner, Matthew S.
name: Yamamoto, Ryoichi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Transport of material across liquid interfaces is ubiquitous for living cells and is also a crucial step in drug delivery and in many industrial processes. The fluids that are present on either side of the interfaces will usually have different viscosities. We present a physical model for the dynamics of microswimmers near a soft and penetrable interface that we solve using computer simulations of Navier-Stokes flows. The literature contains studies of similar isoviscous fluid systems, where the two fluids have the same viscosity. Here we extend this to the more general case where they have different viscosities. We investigate the effect of the fluid viscosity ratio on the movement patterns of microswimmers. We find that swimmers systematically reorientate towards the region containing the lower viscosity fluid. Ultimately this is expected to drive the swimmers to behave as if they are more inclined to swim in low viscosity fluids. Furthermore, in addition to the types of swimming already reported in the isoviscous system, i.e. bouncing, sliding and penetrating, we observed a hovering motion, in which strong pullers swim parallel to the interface with a certain distance, which is consistent with the dynamics of such swimmers near the solid wall.
title: Welfare Status, Gender, and the Utilization of Marital Counseling Services
Creators: name: Wyatt, Courtney A.
Publisher: name: Utah State University
Year: 2006

description: The purpose of this study was to examine how welfare status, gender, and the interaction between welfare status and gender relate to the utilization of counseling services related to marriage (i.e., "marital help-seeking"). This study was a secondary analysis of the Utah Marriage Survey data set from 2003. Two samples were utilized in this study, and generated a total sample of I ,316 participants. The first sample was made up of I, 173 randomly selected Utah households, identified through a random-digit dialing sampling technique. The second sample was obtained from a random selection of current Temporary Assistance for Needy Families (TANF) recipients. This sample of 143 TANF recipients provided an over-sample of low-income households, thus permitting comparisons with the first sample. Participants were identified through the sampling techniques described and contacted by telephone to complete the survey. The data pertaining to participants' welfare status, gender, and attitudes and behavior related to marital help-seeking were analyzed using chi-square analyses and I tests. The results indicated that welfare status is not significantly associated with marital help-seeking attitudes and behavior. In addition, no significant relationship was found between gender and marital help-seeking behavior. However, results indicated that males have less favorable attitudes than women toward marital help-seeking. Finally, welfare status and gender were not found to have a combined relationship effect on marital help-seeking attitudes and behavior.
Phase-Space Networks of Geometrical Frustrated Systems
Creators: name: Han, Yilong
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Geometric frustration leads to complex phases of matter with exotic properties. Antiferromagnets on triangular lattices and square ice are two simple models of geometrical frustration. We map their highly degenerated ground-state phase spaces as discrete networks such that network analysis tools can be introduced to phase-space studies. The resulting phase spaces establish a novel class of complex networks with Gaussian spectral densities. Although phase-space networks are heterogeneously connected, the systems are still ergodic except under periodic boundary conditions. We elucidate the boundary effects by mapping the two models as stacks of cubes and spheres in higher dimensions. Sphere stacking in various containers, i.e. square ice under various boundary conditions, reveals challenging combinatorial questions. This network approach can be generalized to phase spaces of some other complex systems.
title: Examining The Relationship Between Connection Rituals and Marital Satisfaction: A Correlational Study
Creators: name: Brown, Heather Holmgren
Publisher: name: Utah State University
Year: 2007

description: The purpose of this study was to examine the types, frequency, and meaningfulness of connection rituals and the relation ship between these items and marital satisfaction. Past research has shown that rituals correlate with marital satisfaction. Three research questions guided the study: ( I) What connection rituals do couples participate in and with what frequency? (2) How meaningful are the connection rituals to the husband or wife? and (3) Are some connection rituals more strongly associated to marital satisfaction?
The research questions were tested with data from eighty couples who completed a survey designed specifically for this study. The top three reported rituals in each category among men and women were obtained. Results found that men and women participate in many different types of rituals, with daily greeting being used most often and love rituals having the most meaning on ave rage for participants. A modest relationship was reported among husbands' report of meaningfulness in regular talk time, religious/spiritual activities and other categories and marital satisfaction. A modest relationship was also reported among wives' report of meaningfulness in regular talk time and love rituals and marital satisfaction. Implications and suggestions for future research are also presented.
Functional renormalization group for multilinear disordered Langevin dynamics II: Revisiting the $p=2\,$ spin dynamics for Wigner and Wishart ensembles
Creators: name: Lahoche, Vincent
name: Samary, Dine Ousmane
name: Tamaazousti, Mohamed
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we investigate the large-time behavior for a slightly modified version of the standard p=2 soft spins dynamics model, including a quartic or higher potential. The equilibrium states of such a model correspond to an effective field theory, which has been recently considered as a novel paradigm for signal detection in data science based on the renormalization group argument. We consider a Langevin-like equation, including a disorder term that leaves in the Wigner or Wishart ensemble. Then we construct a nonperturbative renormalization group formalism valid in the large N limit, where eigenvalues distributions for the disorder can be replaced by their analytic limits, namely the Wigner and Marchenko-Pastur laws. One of the main advantages of this approach is that the interactions remain local in time, avoiding the non-locality arising from the approaches that integrate out the disorder at the partition function level.
description: 66 pages, 31 figures
Detailed and simplified plasma models in combined-cycle magnetohydrodynamic power systems
Creators: name: Marzouk, Osama A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences
subject: I.6.3; I.6.0
subject: 00A79, 76W05

description: Magnetohydrodynamics (MHD) is a subject concerned with the dynamics of electrically conducting fluids (plasma) and can be applied in electric power generation. As a unique technology for producing direct-current electricity without moving parts, it can be utilized within a high-temperature topping power cycle to be combined with a traditional bottoming power cycle, forming a combined-cycle MHD system. This study presents governing equations for the electric field and current density field within a moving plasma subject to an applied magnetic field. The modeling equations are described at four descending levels of complexity. Starting with the first level of modeling, which is the most general case, where no assumptions are made regarding the electric field, plasma velocity field, applied magnetic field, or electrode geometry. In the second level of modeling, the magnetic field is treated as one-dimensional. In the third level of modeling, a specific Faraday-type magnetohydrodynamics plasma generator channel is considered, having two continuous electrodes acting as parallel constant-voltage terminals. In the fourth (and simplest) level of modeling, an additional approximation is made by setting the Hall parameter to zero and replacing all vector fields with scalar quantities. For that simplest model, a representative set of operation conditions (electric conductivity 20 S/m, temperature 2800 K, supersonic plasma gas speed 2000 m/s with Mach 2.134, and magnetic flux density 5 T) shows that the optimum idealized electric power that can be extracted from a unit volume of plasma is estimated as 500 MW/m3. This is a much larger volumetric power density than typical values encountered in reciprocating piston-type engines (0.2 MW/m3) or rotary gas turbine engines (0.5 MW/m3). Such an extremely high power density enables very compact power generation units.
description: 13 pages, 5 figures, journal paper
Spark spectra of lead
Creators: name: Lyall, Kenneth Russell
Publisher: name: University of British Columbia
Year: 2011

description: The atomic and ionic spectra of lead have been photographed in the region between 350 A and 7680 A, using a three meter normal incidence vacuum grating spectrograph, and a Hilger large quartz-glass prism spectrograph. Spectroscopic sources used throughout this region were the electrodeless discharge, and the condensed spark in helium. Approximately 4075 lead lines were measured, and of these, 1006 have been classified in the spectra of Pb I, Pb II, Pb III, and Pb IV. The Pb IV analysis has been extended: relative energies have been assigned to eight even and two odd levels arising from the 5d¹ºns, np, nd and ng configurations, and tentative values given to several levels from the 6s7s and 6s6d configurations of the 5d⁹ core. The core-polarization theory has been applied to the observed 5g - nh transitions of Pb IV, giving a value for the ionization potential of 341438 cm⁻¹.
Topological change of the Fermi surface in ternary iron-pnictides with reduced c/a ratio: A dHvA study of CaFe2P2
Creators: name: Coldea, Amalia I.
name: Andrew, C. M. J.
name: Analytis, J. G.
name: McDonald, R. D.
name: Bangura, A. F.
name: Chu, J. -H.
name: Fisher, I. R.
name: Carrington, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report a de Haas-van Alphen effect study of the Fermi surface of CaFe2P2 using low temperature torque magnetometry up to 45 T. This system is a close structural analogue of the collapsed tetragonal non-magnetic phase of CaFe2As2. We find the Fermi surface of CaFe2P2 to differ from other related ternary phosphides in that its topology is highly dispersive in the c-axis, being three-dimensional in character and with identical mass enhancement on both electron and hole pockets (~1.5). The dramatic change in topology of the Fermi surface suggests that in a state with reduced (c/a) ratio, when bonding between pnictogen layers becomes important, the Fermi surface sheets are unlikely to be nested.
Weighted-Set Graph Colorings
Creators: name: Shrock, Robert
name: Xu, Yan
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a weighted-set graph coloring problem in which one assigns $q$ colors to the vertices of a graph such that adjacent vertices have different colors, with a vertex weighting $w$ that either disfavors or favors a given subset of $s$ colors contained in the set of $q$ colors. We construct and analyze a weighted-set chromatic polynomial $Ph(G,q,s,w)$ associated with this coloring. General properties of this weighted-set chromatic polynomial are proved, and illustrative calculations are presented for various families of graphs. This study extends a previous one for the case $s=1$ and reveals a number of interesting new features.
description: 44 p. latex
AdS scale separation and the distance conjecture
Creators: name: Shiu, Gary
name: Tonioni, Flavio
name: Van Hemelryck, Vincent
name: Van Riet, Thomas
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It has been argued that orientifold vacua with fluxes in type IIA string theory can achieve moduli stabilisation and arbitrary decoupling between the AdS and KK scales upon sending certain unconstrained RR-flux quanta to infinity. In this paper, we find a novel scalar field in the open-string sector that allows us to interpolate between such IIA vacua that differ in flux quanta and find that the limit of large fluxes is nicely consistent with the distance conjecture. This shows that the massive IIA vacua pass an important Swampland criterion and suggests that scale-separated AdS vacua might not be in the Swampland. Our analysis also naturally suggests a flux analogue of "Reid's fantasy" where flux vacua that differ in quantised flux numbers can be connected through trajectories in open-string field space and not just via singular domain walls.
description: 19 pages + appendices, 4 figures; v2: minor edits, JHEP version
JMAC Protocol: A Cross-Layer Multi-Hop Protocol for LoRa
Creators: name: Escobar, Juan José López
name: Gil-Castiñeira, Felipe
name: Díaz-Redondo, Rebeca P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The emergence of Low-Power Wide-Area Network (LPWAN) technologies allowed the development of revolutionary Internet Of Things (IoT) applications covering large areas with thousands of devices. However, connectivity may be a challenge for non-line-of-sight indoor operation or for areas without good coverage. Technologies such as LoRa and Sigfox allow connectivity for up to 50,000 devices per cell, several devices that may be exceeded in many scenarios. To deal with these problems, this paper introduces a new multi-hop protocol, called JMAC, designed for improving long range wireless communication networks that may support monitoring in scenarios such smart cities or Industry 4.0. JMAC uses the LoRa radio technology to keep low consumption and extend coverage area, and exploits the potential mesh behaviour of wireless networks to improve coverage and increase the number of supported devices per cell. \mbox{JMAC is} based on predictive wake-up to reach long lifetime on sensor devices. Our proposal was validated using the OMNeT++ simulator to analyze how it performs under different conditions with promising results
description: 19 pages, 11 figures, journal
Phase Synchronization in Unidirectionally Coupled Ikeda Time-delay Systems
Creators: name: Senthilkumar, D. V.
name: Lakshmanan, M.
name: Kurths, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Phase synchronization in unidirectionally coupled Ikeda time-delay systems exhibiting non-phase-coherent hyperchaotic attractors of complex topology with highly interwoven trajectories is studied. It is shown that in this set of coupled systems phase synchronization (PS) does exist in a range of the coupling strength which is preceded by a transition regime (approximate PS) and a nonsynchronous regime. However, exact generalized synchronization does not seem to occur in the coupled Ikeda systems (for the range of parameters we have studied) even for large coupling strength, in contrast to our earlier studies in coupled piecewise-linear and Mackey-Glass systems \cite{dvskml2006,dvskml2008}. The above transitions are characterized in terms of recurrence based indices, namely generalized autocorrelation function $P(t)$, correlation of probability of recurrence (CPR), joint probability of recurrence (JPR) and similarity of probability of recurrence (SPR). The existence of phase synchronization is also further confirmed by typical transitions in the Lyapunov exponents of the coupled Ikeda time-delay systems and also using the concept of localized sets.
description: 10 pages, 7 figures
On the Second Order Statistics of the Multihop Rayleigh Fading Channel
Creators: name: Hadzi-Velkov, Zoran
name: Zlatanov, Nikola
name: Karagiannidis, George K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Second order statistics provides a dynamic representation of a fading channel and plays an important role in the evaluation and design of the wireless communication systems. In this paper, we present a novel analytical framework for the evaluation of important second order statistical parameters, as the level crossing rate (LCR) and the average fade duration (AFD) of the amplify-and-forward multihop Rayleigh fading channel. More specifically, motivated by the fact that this channel is a cascaded one and can be modeled as the product of N fading amplitudes, we derive novel analytical expressions for the average LCR and the AFD of the product of N Rayleigh fading envelopes (or of the recently so-called N*Rayleigh channel). Furthermore, we derive simple and efficient closed-form approximations to the aforementioned parameters, using the multivariate Laplace approximation theorem. It is shown that our general results reduce to the corresponding ones of the specific dual-hop case, previously published. Numerical and computer simulation examples verify the accuracy of the presented mathematical analysis and show the tightness of the proposed approximations.
title: Premarital Preparation and Marital Satisfaction: What Utah Individuals are Doing to Prepare for Marriage and How Premarital Preparation Can Enhance Marital Satisfaction
Creators: name: Belnap Foster, Fay L.
Publisher: name: Utah State University
Year: 2007

description: This is a systematic representative sample study of newlyweds designed to investigate aspects of participation in marriage preparation activities as well as determine what effect participation in activities had on marital satisfaction. A retrospective survey instrument was utilized which included the Kansas Marital Satisfaction Scale.
Statistical analysis revealed that the majority of individuals in Utah prepare for marriage by visiting with parents or relatives, visiting with other married couples, and talking with religious leaders, and considered these activities to be helpful in their preparation. The small er percentage of individuals who participated in more formal preparation activities also considered these activities to be very helpful. Wives and husbands who attended a class and talked with religious leaders showed significant increases in marital satisfaction within a year after marriage. In addition, marital satisfaction was increased for wives who read a book on marriage and for husbands who visited with their parents, relatives, or other married couples. Findings show that bringing children into marriage, parents' marital status, and age are factors associated with marital satisfaction.
Spatially averaged cosmology in an arbitrary coordinate system
Creators: name: Larena, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: This paper presents a general averaging procedure for a set of observers which are tilted with respect to the cosmological matter fluid. After giving the full set of equations describing the local dynamics, we define the averaging procedure and apply it to the scalar parts of Einstein's field equations. In addition to the standard backreaction, new terms appear that account for the effect of the peculiar velocity of the matter fluid as well as the possible effect of a shift in the coordinate system.
description: 8 pages, no figure. Replaced to match the version published in Phys. Rev. D
Accurate characterization of the stochastic gravitational-wave background with pulsar timing arrays by likelihood reweighting
Creators: name: Hourihane, Sophie
name: Meyers, Patrick
name: Johnson, Aaron
name: Chatziioannou, Katerina
name: Vallisneri, Michele
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: An isotropic stochastic background of nanohertz gravitational waves creates excess residual power in pulsar-timing-array datasets, with characteristic inter-pulsar correlations described by the Hellings-Downs function. These correlations appear as nondiagonal terms in the noise covariance matrix, which must be inverted to obtain the pulsar-timing-array likelihood. Searches for the stochastic background, which require many likelihood evaluations, are therefore quite computationally expensive. We propose a more efficient method: we first compute approximate posteriors by ignoring cross correlations, and then reweight them to exact posteriors via importance sampling. We show that this technique results in accurate posteriors and marginal likelihood ratios, because the approximate and exact posteriors are similar, which makes reweighting especially accurate. The Bayes ratio between the marginal likelihoods of the exact and approximate models, commonly used as a detection statistic, is also estimated reliably by our method, up to ratios of at least $10^6$.
description: 10 pages, 5 figures
Variabilidade Interanual do Traçado Preferencial Ciclônico no Oceano Atlântico Sul
Creators: name: HELOISA SILVA
name: DALANHESE, LUTHIENE
name: ANDRE L. BELEM
Publisher: name: figshare
Year: 2021
Subjects: subject: 40503 Physical Oceanography
subject: FOS: Earth and related environmental sciences
subject: Oceanography
subject: 40107 Meteorology
subject: Atmospheric Sciences
subject: Climate Science

description: O presente trabalho demonstra a trajetória e as características sinóticas dos ciclones extratropicais associados à frentes frias no Hemisfério Sul, mais especificamente entre as latitudes de 10 ° S e 45 ° S entre os anos de 2010-2020. As análises foram definidas uma metodologia de autoria própria, utilizando as Cartas sinóticas concedidas pelo Centro Hidrográfico da Marinha do Brasil. O trabalho possui um caráter inovador que padroniza as diferentes ferramentas históricas de ciclones extratropicais e seu deslocamento pelo Atlântico Sul em busca da preparação de uma climatologia interanual.
Ressalta-se que o presente trabalho é de suma importância pois a partir do mesmo podem ser elaborados identificadores de cenário de risco, ligados a fenômenos de maior impacto, e por consequência, sua durabilidade a fim de prever desastres ambientais relacionados ao traçado cicl no Atlântico Sul.
Recursive T matrix algorithm for resonant multiple scattering: Applications to localized plasmon excitations
Creators: name: Stout, Brian
name: Auger, Jean-Claude
name: Devilez, Alexis
Publisher: name: arXiv
Year: 2009
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A matrix balanced version of the Recursive Centered T Matrix Algorithm (RCTMA) applicable to systems possessing resonant inter-particle couplings is presented. Possible domains of application include systems containing interacting localized plasmon resonances, surface resonances, and photonic jet phenomena. This method is of particular interest when considering modifications to complex systems. The numerical accuracy of this technique is demonstrated in a study of particles with strongly interacting localized plasmon resonances.
Reieluu proksimaalse osa tugevus ja Singhi indeks
Creators: name: Koha, Rein
Publisher: name: OÜ Celsius Healthcare
Year: 2002
Subjects: reieluukaela trabekulaar-arhitektoonika, Singhi indeks, vedelkristallid, luu tugevus

description: Eksperimendis, kus reieluu pähikut mõjutati reieluu diafüüsiga ristisuunalise jõuga kuni reieluumurru tekkeni ning leiti, et reieluukaela piirkonna mineraalainete sisalduse ja luu tugevuse vahel puudub korrelatsioon. Seega, osteoporoosi väljendusaste ei ole alati luu tugevuse näitajaks. Luu tugevuse tagab ka I tüüpi kollageeni fraktsioon, tema vedelkristallilised omadused.


Eesti Arst 2002; 81 (12): 780–782
description: Eesti Arst, Detsember 2002
Global synchronization of atomic oscillations in a crystal lattice using an external magnetic field: a new approach to enhancing radiation resistance.
Creators: name: Dorofeev
Publisher: name: Andrey Dorofeev
Year: 2025
Subjects: Phonons
magnetostriction
synchronization
radiation resistance
thermonuclear energy
magnetic field
global oscillation

description: In this work, for the first time, the possibility of global synchronization of atomic oscillations (phonons) throughout the entire volume of a crystal under the influence of an external resonant magnetic field is investigated. If the atoms in the material oscillate coherently (with a single frequency and phase), disturbances caused by high temperatures and radiation do not lead to an avalanche-like accumulation of defects. Instead, the energy of the external field is redistributed in the form of a coherent wave, which can contribute to the "scattering" or recombination of point defects. We present a theoretical model based on magnetostrictive interaction, demonstrate analytical estimates of threshold conditions for the onset of the synchronous regime, and discuss possible numerical verifications using molecular dynamics. It is shown that using the energy of the thermonuclear reactor itself to generate the required magnetic field can significantly increase the service life of structural materials through global phonon synchronization.
Reaction He# (He3, 2p)He4 and the diproton state
Creators: name: Blackmore, Ewart William
Publisher: name: University of British Columbia
Year: 2011

description: The processes by which the three particle final state is formed in the He³(He³,2p)He⁴ reaction were investigated by observing the angular distribution of coincidence events between the two protons as a function of the angle between the protons. The reaction mechanism was determined by comparing the experimental distribution with those predicted for the various possible processes obtained from kinematic and phase space arguments. The reaction was found to proceed predominantly by sequential decays through unbound intermediate states and to a lesser extent by a direct instantaneous three body breakup. The majority of the two stage decays passed through the ground state of Li⁵ , The mean lifetime of this state was measured and found to be (1.0 ± .3) x 10⁻²¹ sec There was also good evidence of a sequential decay through the diproton state. In order to fit the shape of the observed distribution it was necessary to assume that a diproton system exists which is unbound by 600 keV and has a mean lifetime of 1.5 x 10⁻²² sec However another possible interpretation is that a direct breakup occurs and the angular distribution of the protons is distorted by an attractive final state two proton interaction similar to the scattering interaction, although whether this interaction would be strong enough to produce the observed distribution is not known. A more quantitative three body decay theory is therefore necessary in order to draw any firm conclusions about the existence of the diproton state.
PT-Symmetric Wave Chaos
Creators: name: West, Carl T.
name: Kottos, Tsampikos
name: Prosen, Tomaz
Publisher: name: arXiv
Year: 2010
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a new class of chaotic systems with dynamical localization, where gain or loss mechanisms break the Hermiticity, while allowing for parity-time (PT) symmetry. For a value γ_PT of the gain or loss parameter the spectrum undergoes a spontaneous phase transition from real (exact phase) to complex values (broken phase). We develop a one parameter scaling theory for γ_PT, and show that chaos assists the exact PT phase. Our results have applications to the design of optical elements with PT symmetry.
description: 4 pages, 2 figures
Beam-like topologically interlocked structures with hierarchical interlocking
Creators: name: Koureas, Ioannis
name: Pundir, Mohit
name: Feldfogel, Shai
name: Kammer, David S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Topologically interlocked materials and structures, which are assemblies of unbonded interlocking building blocks, are promising concepts for versatile structural applications. They have been shown to exhibit exceptional mechanical properties, including outstanding combinations of stiffness, strength, and toughness, beyond those achievable with common engineering materials. Recent work has established a theoretical upper limit for the strength and toughness of beam-like topologically interlocked structures. However, this theoretical limit is only achievable for structures with unrealistically high friction coefficients; therefore, it remains unknown whether it is achievable in actual structures. Here, we demonstrate that a hierarchical approach for topological interlocking, inspired by biological systems, overcomes these limitations and provides a path toward optimized mechanical performance. We consider beam-like topologically interlocked structures that present a sinusoidal surface morphology with controllable amplitude and wavelength and examine the properties of the structures using numerical simulations. The results show that the presence of surface morphologies increases the effective frictional strength of the interfaces and, if well-designed, enables us to reach the theoretical limit of the structural carrying capacity with realistic friction coefficients. Furthermore, we observe that the contribution of the surface morphology to the effective friction coefficient of the interface is well described by a criterion combining the surface curvature and surface gradient. Our study demonstrates the ability to architecture the surface morphology in beam-like topological interlocked structures to significantly enhance its structural performance.
Homotsüsteiin ägeda koronaarse sündroomiga patsientidel
Creators: name: Zilmer, Kersti
name: Kalder, Mart
name: Zilmer, Mihkel
name: Muda, Piibe
name: Kampus, Priit
name: Teesalu, Rein
name: Soopõld, Üllar
Publisher: name: OÜ Celsius Healthcare
Year: 2002
Subjects: homotsüsteiin, äge koronaarne sündroom, hüpertooniatõbi, riskitegur

description: Hüperhomotsüsteineemiat peetakse paljude uuringute andmetel oluliseks ja sõltumatuks ägeda müokardiinfarkti, ajuinfarkti, perifeersete veresoonte okluseerivate haiguste ning tromboosi riskiteguriks. Artiklis on käsitletud hüperhomotsüsteineemia suhtelist sagedust  tervetel isikutel ja ägeda koronaarse sündroomiga patsientidel ning selgitatud, millistel juhtudel avaldab hüperhomotsüsteineemia mõju ägeda koronaarse sündroomi tekkes.


Eesti Arst 2002; 81 (12): 776–779
description: Eesti Arst, Detsember 2002
Resource Allocation for Dataflow Applications in FANETs using Anypath Routing
Creators: name: Escobar, Juan José López
name: Ricardo, Manuel
name: Campos, Rui
name: Gil-Castiñeira, Felipe
name: Díaz-Redondo, Rebeca P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Management of network resources in advanced IoT applications is a challenging topic due to their distributed nature from the Edge to the Cloud, and the heavy demand of real-time data from many sources to take action in the deployment. FANETs (Flying Ad-hoc Networks) are a clear example of heterogeneous multi-modal use cases, which require strict quality in the network communications, as well as the coordination of the computing capabilities, in order to operate correctly the final service. In this paper, we present a Virtual Network Embedding (VNE) framework designed for the allocation of dataflow applications, composed of nano-services that produce or consume data, in a wireless infrastructure, such as an airborne network. To address the problem, an anypath-based heuristic algorithm that considers the quality demand of the communication between nano-services is proposed, coined as Quality-Revenue Paired Anypath Dataflow VNE (QRPAD-VNE). We also provide a simulation environment for the evaluation of its performance according to the virtual network (VN) request load in the system. Finally, we show the suitability of a multi-parameter framework in conjunction with anypath routing in order to have better performance results that guarantee minimum quality in the wireless communications.
description: 22 pages, 9 figures, journal
On uniqueness and ill-posedness for the deautoconvolution problem in the multi-dimensional case
Creators: name: Hofmann, Bernd
name: Werner, Frank
name: Deng, Yu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper analyzes the inverse problem of deautoconvolution in the multi-dimensional case with respect to solution uniqueness and ill-posedness. Deautoconvolution means here the reconstruction of a real-valued $L^2$-function with support in the $n$-dimensional unit cube $[0,1]^n$ from observations of its autoconvolution either in the full data case (i.e. on $[0,2]^n$) or in the limited data case (i.e. on $[0,1]^n$). Based on multi-dimensional variants of the Titchmarsh convolution theorem due to Lions and Mikusiński, we prove in the full data case a twofoldness assertion, and in the limited data case uniqueness of non-negative solutions for which the origin belongs to the support. The latter assumption is also shown to be necessary for any uniqueness statement in the limited data case. A glimpse of rate results for regularized solutions completes the paper.
Invasion success and management strategies for social vespula wasps
Creators: name: Lester, Philip
name: Beggs, JR
Publisher: name: Open Access Victoria University of Wellington | Te Herenga Waka
Year: 2021
Subjects: subject: 50299 Environmental Science and Management not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Zoology
subject: FOS: Biological sciences

description: Three species of Vespula have become invasive in Australia, Hawailsquoi, New Zealand, and North and South America and continue to spread. These social wasp species can achieve high nest densities, and their behavioral plasticity has led to substantial impacts on recipient communities. Ecologically, they affect all trophic levels, restructuring communities and altering resource flows. Economically, their main negative effect is associated with pollination and the apicultural industry. Climate change is likely to exacerbate their impacts in many regions. Introduced Vespula spp. likely experience some degree of enemy release from predators or parasites, although they are exposed to a wide range of microbial pathogens in both their native and introduced range. Toxic baits have been significantly improved over the last decade, enabling effective landscape-level control. Although investigated extensively, no effective biological control agents have yet been found. Emerging technologies such as gene drives are under consideration.
Multi-criteria recommendation systems to foster online grocery
Creators: name: Hafez, Manar Mohamed
name: Redondo, Rebeca P. Díaz
name: Fernández-Vilas, Ana
name: Pazó, Héctor Olivera
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: With the exponential increase in information, it has become imperative to design mechanisms that allow users to access what matters to them as quickly as possible. The recommendation system ($RS$) with information technology development is the solution, it is an intelligent system. Various types of data can be collected on items of interest to users and presented as recommendations. $RS$ also play a very important role in e-commerce. The purpose of recommending a product is to designate the most appropriate designation for a specific product. The major challenges when recommending products are insufficient information about the products and the categories to which they belong. In this paper, we transform the product data using two methods of document representation: bag-of-words (BOW) and the neural network-based document combination known as vector-based (Doc2Vec). We propose three-criteria recommendation systems (product, package, and health) for each document representation method to foster online grocery, which depends on product characteristics such as (composition, packaging, nutrition table, allergen, etc.). For our evaluation, we conducted a user and expert survey. Finally, we have compared the performance of these three criteria for each document representation method, discovering that the neural network-based (Doc2Vec) performs better and completely alters the results.
description: 30 pages, 8 images, journal
Dienogest – uus hübriidprogestiin
Creators: name: Sinisalu, Väino
Publisher: name: OÜ Celsius Healthcare
Year: 2002

description: Dienogest on niinimetatud hübriidprogestiinide rühma esindaja, millel tänu oma keemilisele struktuurile on nii progesterooni derivaatide tüüpilisi omadusi kui ka 19-norprogestiinide omadusi. Seetõttu on dienogest kasutusel nii endometrioosi ravis, postmenopausaalses hormoonasendusravis kui ka progestiinkomponendina rasestumisvastastes preparaatides.
description: Eesti Arst, Detsember 2002
Comment on "Harvesting information to control non-equilibrium states of active matter"
Creators: name: Bérut, Antoine
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In the article Phys. Rev. E 106, 054617 "Harvesting information to control non-equilibrium states of active matter", the authors study the transition from one non-equilibrium steady-state (NESS) to another NESS by changing the correlated noise that is driving a Brownian particle held in an optical trap. They find that the amount of heat that is released during the transition is directly proportional to the difference of spectral entropy between the two colored noises, in a fashion that is reminiscent of Landauer's principle. In this comment I argue that the found relation between the released heat and the spectral entropy does not hold in general, and that one can provide examples of noises where it clearly fails. I also show that, even in the case considered by the authors, the relation cannot be rigorously true and is only approximately verified experimentally.
description: 7 pages, 4 figures
Light and Not So Light Scalar Mesons
Creators: name: Rupp, George
name: Coito, Susana
name: van Beveren, Eef
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A multichannel description of the light scalar mesons in the framework of the Resonance-Spectrum Expansion is generalised by including vector-vector and scalar-scalar channels, besides the usual pseudoscalar-pseudoscalar channels. Experimental data for the isoscalar, isodoublet and isovector cases are fitted up to energies well above 1 GeV. The resulting pole positions of the light and intermediate scalar mesons are compared to the listed resonances. Possible further improvements are discussed.
description: Acta Physica Polonica style, 6 pages, 2 figures (4 graphs); plenary talk given by G. Rupp at Workshop "Excited QCD", Zakopane, Poland, 8-14 Feb. 2009
title: External Sources of Funds for the Economic Development of Venezuela
Creators: name: Shinde, S. S.
Publisher: name: Utah State University
Year: 1965

description: Economic development of a country is generally regarded as an urgent need. It is necessary to improve the standard of living, promote mass education, and improve the general health of the people. The economic development of a country is important not only for the welfare of the people, but it may also promote the establishment of a democratic form of government which many regards as a highly desirable goal.
N-Body Simulation of Planetesimal Formation through Gravitational Instability and Coagulation. II. Accretion Model
Creators: name: Michikoshi, Shugo
name: Kokubo, Eiichiro
name: Inutsuka, Shu-ichiro
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The gravitational instability of a dust layer is one of the scenarios for planetesimal formation. If the density of a dust layer becomes sufficiently high as a result of the sedimentation of dust grains toward the midplane of a protoplanetary disk, the layer becomes gravitationally unstable and spontaneously fragments into planetesimals. Using a shearing box method, we performed local $N$-body simulations of gravitational instability of a dust layer and subsequent coagulation without gas and investigated the basic formation process of planetesimals. In this paper, we adopted the accretion model as a collision model. A gravitationally bound pair of particles is replaced by a single particle with the total mass of the pair. This accretion model enables us to perform long-term and large-scale calculations. We confirmed that the formation process of planetesimals is the same as that in the previous paper with the rubble pile models. The formation process is divided into three stages: the formation of non-axisymmetric structures, the creation of planetesimal seeds, and their collisional growth. We investigated the dependence of the planetesimal mass on the simulation domain size. We found that the mean mass of planetesimals formed in simulations is proportional to $L_y^{3/2}$, where $L_y$ is the size of the computational domain in the direction of rotation. However, the mean mass of planetesimals is independent of $L_x$, where $L_x$ is the size of the computational domain in the radial direction if $L_x$ is sufficiently large. We presented the estimation formula of the planetesimal mass taking into account the simulation domain size.
description: 24 pages, 13 figures,Accepted for publication in ApJ
Effective interfacial Dzyaloshinskii-Moriya interaction and skyrmion stabilization in ferromagnet/paramagnet and ferromagnet/superconductor hybrid systems
Creators: name: Kuznetsov, M. A.
name: Mukhamatchin, K. R.
name: Fraerman, A. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: It is shown that a term in the form of Dzyaloshinskii-Moriya interaction (DMI) contributes to the free energy of a ferromagnetic (FM) film on a paramagnetic (PM) (an FM above the critical temperature, Tc) or superconducting (SC) substrate occurring in the London limit. This contribution results from magnetostatic interaction between the film and substrate under which the substrate affects FM magnetization back via its magnetic field produced by magnetization inhomogeneity in the film. Strikingly, in the FM/PM system this effective DMI stabilizes chiral magnetic textures, e.g., magnetic skyrmions (MSk's) of the Neel-type, which is in contrast to that in the FM/SC one. A strong temperature sensitivity of the effective DMI allows for tuning the coupling between the FM film and PM or SC substrate and thus controlling the MSk radius in FM/PM.
description: 9 pages, 2 figures
Anne Ormisson 60
Creators: name: Mikelsaar, Raik-Hiio
Publisher: name: OÜ Celsius Healthcare
Year: 2002

description: Ettevõtlikust ja edasipürgivast noorest TRÜ arsti- teaduskonna 1967. aastal lõpetanud arstist sai pediaater, kes töötas esialgu Võru, siis Viljandi Rajooni Keskhaiglas. Alates 1971. a on A. Ormisson olnud seotud Tartuga: ta alustas jaoskonnapediaatrina ja osakonnajuhatajana lastepolikliinikus, 1975. a kaitses meditsiinikandidaadi kraadi teemal “Piimahappe- koormuse mõju happe-alustasakaalule pneumooniaga väikelastel”, seejärel töötas Tartu linna peapediaatrina.
description: Eesti Arst, Detsember 2002
Blue-Detuned Magneto-Optical Trap of Molecules
Creators: name: Burau, Justin J.
name: Aggarwal, Parul
name: Mehling, Kameron
name: Ye, Jun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Direct laser cooling of molecules has reached a phase space density exceeding 10$^{-6}$ in optical traps, but with rather small molecular numbers. To progress towards quantum degeneracy, a mechanism is needed that combines sub-Doppler cooling and magneto-optical trapping (MOT) to facilitate near unity transfer of ultracold molecules from the MOT to a conservative optical trap. Using the unique energy level structure of YO molecules, we demonstrate the first blue-detuned MOT for molecules that is optimized for both gray-molasses sub-Doppler cooling and relatively strong trapping forces. This first sub-Doppler molecular MOT provides an increase of phase-space density by two orders of magnitude over any previously reported molecular MOT.
description: 6 pages, 6 figures
Comparing Hbeta Line Profiles in the 4D Eigenvector 1 Context
Creators: name: Sulentic, J. W.
name: Marziani, P.
name: Zamfir, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We describe a 4D Eigenvector 1 (4DE1) space that serves as a surrogate H-R diagram for quasars. It provides a context for describing and unifying differences between all broad line AGN. Quasar spectra can be averaged in a non-random way using 4DE1 just as stellar spectra can be averaged non-randomly within the OBAFGKM classification sequence. We find that quasars with FWHM H_beta less than (Population A) and greater than (Population B) 4000 km/s show many significant differences that may point to an actual dichotomy. Broad line profile measures and fits reenforce the idea of a dichotomy because they are fundamentally different: Pop.A - Lorentzian-like and Pop.B - double Gaussian. The differences have implications both for BH mass estimation and for inferences about source structure and kinematics.
description: 11 pages, 4 figures
Solvability of a fourth order elliptic problem in a bounded sector, part I
Creators: name: Labbas, Rabah
name: Maingot, Stéphane
name: Thorel, Alexandre
Publisher: name: arXiv
Year: 2023
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The purpose of this article (composed of two parts) is the study of the generalized dispersal operator of a reaction-diffusion equation in $L^p$-spaces set in the finite conical domain $S_{ω,ρ}$ of angle $ω>0$ and radius $ρ$ > 0 in $\mathbb{R}^2$. This first part is devoted to the behavior of the solution near the top of the cone which is completely described in the weighted Sobolev space $W^{4,p}_{3-\frac{1}{p}}(S_{ω,ρ_0})$, $ρ_0 \leqslant ρ$, see Theorem 2.2.
description: Bollettino dell'Unione Matematica Italiana, 2023. arXiv admin note: substantial text overlap with arXiv:2207.05404