cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mapping of two-dimensional contact problems on a problem with a one-dimensional parametrization
Creators: name: Popov, V.L.
Publisher: name: Физическая мезомеханика
Year: 2017
Subjects: LINE CONTACT
TWO-DIMENSIONAL CONTACT
METHOD OF DIMENSIONALITY REDUCTION
MOSSAKOVSKII-JäGER SUPERPOSITION PRINCIPLE
ADHESION
ДВУМЕРНЫЕ ЗАДАЧИ МЕХАНИКИ КОНТАКТНОГО ВЗАИМОДЕЙСТВИЯ
МЕТОД РЕДУКЦИИ РАЗМЕРНОСТИ
ПРИНЦИП СУПЕРПОЗИЦИИ MOSSAKOVSKII-JäGER
АДГЕЗИЯ '

description: We discuss a possible generalization of the ideas of the method of dimensionality reduction (MDR) for the mapping of two-dimensional contact problems (line contacts). The conventional formulation of the MDR is based on the existence and uniqueness of a relation between indentation depth and contact radius. In two-dimensional contact problems, the indentation depth is not defined unambiguously, thus another parametrization is needed. We show here that the Mossakovskii-Jäger procedure of representing a contact as a series of incremental indentations by flat-ended indenters can be carried out in two-dimensions as well. The only available parameter of this process is, however, the normal load (instead of indentation depth as in the case of three-dimensional contacts). Using this idea, a complete solution is obtained for arbitrary symmetric two-dimensional contacts with a compact contact area. The solution includes both the relations of force and half-width of the contact and the stress distribution in the contact area. The procedure is generalized for adhesive contacts and is illustrated by solutions of a series of contact problems.
Entropic exercises around the Kneser-Poulsen conjecture
Creators: name: Aishwarya, Gautam
name: Alam, Irfan
name: Li, Dongbin
name: Myroshnychenko, Sergii
name: Zatarain-Vera, Oscar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Metric Geometry (math.MG)
subject: Information Theory (cs.IT)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 52A38, 52A20, 52A40, 94A17

description: We develop an information-theoretic approach to study the Kneser--Poulsen conjecture in discrete geometry. This leads us to a broad question regarding whether Rényi entropies of independent sums decrease when one of the summands is contracted by a $1$-Lipschitz map. We answer this question affirmatively in various cases.
description: 23 pages, comments welcome! Final version with minor changes, added Corollary 2.8 (linear contractions decrease intrinsic volumes of convex bodies)
Mesh d-refinement: a data-based computational framework to account for complex material response
Creators: name: Wattel, Sacha
name: Molinari, Jean-François
name: Ortiz, Michael
name: Garcia-Suarez, Joaquin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Model-free data-driven computational mechanics (DDCM) is a new paradigm for simulations in solid mechanics. The modeling step associated to the definition of a material constitutive law is circumvented through the introduction of an abstract phase space in which, following a pre-defined rule, physically-admissible states are matched to observed material response data (coming from either experiments or lower-scale simulations). In terms of computational resources, the search procedure that performs these matches is the most onerous step in the algorithm. One of the main advantages of DDCM is the fact that it avoids regression-based, bias-prone constitutive modeling. However, many materials do display a simple linear response in the small-strain regime while also presenting complex behavior after a certain deformation threshold. Motivated by this fact, we present a novel refinement technique that turns regular elements (equipped with a linear-elastic constitutive law) into data-driven ones if they are expected to surpass the threshold known to trigger material non-linear response. We term this technique ``data refinement'', ``d-refinement'' for short. Starting from an initially regular FEM mesh, the proposed algorithm detects where the refinement is needed and iterates until all elements presumed to display non-linearity become data-driven ones. Insertion criteria are discussed. The scheme is well-suited for simulations that feature non-linear response in relatively small portions of the domain while the rest remains linear-elastic. The method is validated against a traditional incremental solver (i.e., Newton-Raphson method) and we show that the d-refinement framework can outperform it in terms of speed at no loss of accuracy. We provide an application that showcases the advantage of the new method: bridging scales in architected metamaterials.
description: 24 pages, 12 figures, 4 tables
Gluon fragmentation into quarkonium at next-to-leading order
Creators: name: Artoisenet, Pierre
name: Braaten, Eric
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present the first calculation at next-to-leading order (NLO) in $α_s$ of a fragmentation function into quarkonium whose form at leading order is a nontrivial function of $z$, namely the fragmentation function for a gluon into a spin-singlet S-wave state at leading order in the relative velocity. To calculate the real NLO corrections, we introduce a new subtraction scheme that allows the phase-space integrals to be evaluated in 4 dimensions. We extract all ultraviolet and infrared divergences in the real NLO corrections analytically by calculating the phase-space integrals of the subtraction terms in $4-2ε$ dimensions. We also extract the divergences in the virtual NLO corrections analytically, and detail the cancellation of all divergences after renormalization. The NLO corrections have a dramatic effect on the shape of the fragmentation function, and they significantly increase the fragmentation probability.
description: 33 pages, 4 figures
Towards Openness Beyond Open Access: User Journeys through 3 Open AI Collaboratives
Creators: name: Ding, Jennifer
Publisher: name: Zenodo
Year: 2022

description: This presentation was created for the 2022 Neurips workshop: Broadening Research Collaborations in ML. Open Artificial Intelligence (Open AI) collaboratives offer alternative pathways for how AI can be developed beyond well-resourced technology companies and who can be a part of the process. To understand how and why they work and what additionality they bring to the landscape, we focus on three such communities, each focused on a different kind of activity around AI: building models (BigScience workshop), tools/ways of working (The Turing Way), and ecosystems (Mozilla Festival’s Building Trustworthy AI Working Group). First, we document the community structures that facilitate these distributed, volunteer-led teams, comparing the collaboration styles that drive each group towards their specific goals. Through interviews with community leaders, we map user journeys for how members discover, join, contribute, and participate. Ultimately, this paper aims to highlight the diversity of AI work and workers that have come forth through these collaborations and how they offer a broader practice of openness to the AI space.
Strain topological metamaterials
Creators: name: Allein, Florian
name: Anastasiadis, Adamantios
name: Chaunsali, Rajesh
name: Frankel, Ian
name: Boechler, Nicholas
name: Diakonos, Fotios K.
name: Theocharis, Georgios
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Topological physics has revolutionised materials science, introducing topological insulators and superconductors with applications from smart materials to quantum computing. Bulk-boundary correspondence (BBC) is a core concept therein, where the non-trivial topology of a material's bulk predicts localized topological states at its boundaries. However, edge states also exist in systems where BBC is seemingly violated, leaving any topological origin unknown. For finite-frequency mechanical metamaterials, BBC has hitherto been described in terms of displacements, necessitating fixed boundaries to identify topologically protected edge modes. Herein, we introduce a new family of finite-frequency mechanical metamaterials whose topological properties emerge in strain coordinates for free boundaries. We show two examples, the first being the canonical mass-dimer, where BBC in strain coordinates reveals the previously unknown topological origin of its edge modes. Second, we introduce a new mechanical analog of the Majorana-supporting Kitaev chain. We theoretically and experimentally show that this Kitaev chain supports edge states for both free and fixed boundaries, wherein BBC is established in strains and displacements, respectively. Our findings suggest a previously undiscovered class of topological edge modes may exist, including within other settings such as electrical circuits and optics, and for more complex, tailored boundaries with coordinates other than strain.
description: Florian Allein, Adamantios Anastasiadis, Rajesh Chaunsali contributed equally. 7 pages, 5 figures, comments welcome
Counter Data of the Cosmic Dust Analyzer aboard the Cassini spacecraft and possible "dust clouds" at Saturn
Creators: name: Khalisi, Emil
name: Srama, Ralf
name: Grün, Eberhard
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present the impact rates of dust particles recorded by the Cosmic Dust Analyzer (CDA) aboard the Cassini spacecraft. The "dust counters" evaluate the quality of an impact and give rise to the apparent density of dust particles in space. The raw data is pre-selected and refined to a new structure that serves to a better investigation of densities, flows, and properties of interplanetary dust grains. Our data is corrected for the dead time of the instrument and corresponds to an assumed Kepler orbit (pointing of the sensitive area). The processed data are published on the website for the Magnetosphere and Plasma Science (MAPSview), where it can be correlated with other Cassini instruments. A sample is presented for the Titan flyby on DOY 250/2006. We find that the dust density peaks at two times, at least, in a void region between Titan and Rhea. Such features may point to extended clouds of small particles drifting slowly in space. These density clouds seem to be stable for as long as several months or few years before dispersing.
description: 16 pages, 5 figures
Influence of stress dependence of lubricant shear modulus on self-similar behavior of stress time series
Creators: name: Manko, N.N.
name: Lyashenko, I.A.
Publisher: name: Физическая мезомеханика
Year: 2017
Subjects: LORENTZ SYSTEM
SHEAR STRESS AND STRAIN
BOUNDARY FRICTION
UNIFORM DISTRIBUTION
LANGEVIN AND FOKKER-PLANCK EQUATIONS
СИСТЕМА ЛОРЕНЦА
СДВИГОВЫЕ НАПРЯЖЕНИЯ И ДЕФОРМАЦИИ
ГРАНИЧНОЕ ТРЕНИЕ
ОДНОРОДНОЕ РАСПРЕДЕЛЕНИЕ
УРАВНЕНИЯ ЛАНЖЕВЕНА И ФОККЕРА-ПЛАНКА

description: Here we consider melting of an ultrathin lubricant layer between two atomically smooth solid surfaces taking into account the stress dependence of the lubricant shear modulus and its decrease with increasing stress (strain). In the adiabatic approximation with the stress relaxation time far longer than strain and temperature relaxation times, a Langevin equation is written and its respective Fokker-Planck equation is derived using the Stratonovich calculus. Phase diagrams for the steady case are presented illustrating the effect of the system parameters on the lubricant behavior. A joint numerical and analytical analysis demonstrates a very close match between probability distributions at different parameters. It is shown that in a limited stress range, a self-similar mode of dry friction is established showing up in self-similar behavior of stress time series.
Inflation using a triplet of Antisymmetric tensor fields
Creators: name: Ajith, Abhijith
name: Panda, Sukanta
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study an inflation model driven by a triplet of antisymmetric tensor fields, with minimal and nonminimal couplings to gravity. First, we show that the presence of a triplet of antisymmetric tensor fields can provide inherent background isotropy in the stress-energy tensor contrary to the past studies using an antisymmetric tensor field. Inflation is supported in the presence of non-minimal couplings with gravity. We perform the slow roll analysis and also analyse perturbations to the antisymmetric tensor field as well as the tensor modes of perturbed metric. The speed of gravitational waves manifested from the tensor perturbations is tuned to $c$. We also study the evolution of the gravitational waves, calculate their power spectrum and tensor spectral index.
description: 23 pages, 5 figures
On the possibility of frictional damping with reduced wear: a note on the applicability of Archard’s law of adhesive wear under conditions of fretting
Creators: name: Li, Q.
name: Popov, V.L.
Publisher: name: Физическая мезомеханика
Year: 2017
Subjects: WEAR
FRETTING
FRICTIONAL DAMPING
ARCHARD'S LAW
ИЗНОС
ФРЕТТИНГ
ФРИКЦИОННОЕ ЗАТУХАНИЕ
ЗАКОН АРЧАРДА

description: Based on the recent proof of the existence of a critical length scale controlling mechanisms of adhesive wear, we discuss conditions under which the energy dissipation rate and the wear rate in oscillating contacts may become uncoupled. This potentially opens up a possibility of using frictional damping with low wear rate.
Dynamical Immunization Strategy for Seasonal Epidemics
Creators: name: Yan, Shu
name: Tang, Shaoting
name: Pei, Sen
name: Jiang, Shijin
name: Zheng, Zhiming
Publisher: name: arXiv
Year: 2014
Subjects: subject: Applications (stat.AP)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The topic of finding effective strategy to halt virus in complex network is of current interest. We propose an immunization strategy for seasonal epidemics that occur periodically. Based on the local information of the infection status from the previous epidemic season, the selection of vaccinated nodes is optimized gradually. The evolution of vaccinated nodes during iterations demonstrates that the immunization tends to locate in both global hubs and local hubs. We analyze the epidemic prevalence by a heterogeneous mean-field method and present numerical simulations of our model. This immunization performs superiorly to some other previously known strategies. Our work points out a new direction in immunization of seasonal epidemics.
description: 8 pages, 9 figures
Flexible Supervised Autonomy for Exploration in Subterranean Environments
Creators: name: Biggie, Harel
name: Rush, Eugene R.
name: Riley, Danny G.
name: Ahmad, Shakeeb
name: Ohradzansky, Michael T.
name: Harlow, Kyle
name: Miles, Michael J.
name: Torres, Daniel
name: McGuire, Steve
name: Frew, Eric W.
name: Heckman, Christoffer
name: Humbert, J. Sean
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: While the capabilities of autonomous systems have been steadily improving in recent years, these systems still struggle to rapidly explore previously unknown environments without the aid of GPS-assisted navigation. The DARPA Subterranean (SubT) Challenge aimed to fast track the development of autonomous exploration systems by evaluating their performance in real-world underground search-and-rescue scenarios. Subterranean environments present a plethora of challenges for robotic systems, such as limited communications, complex topology, visually-degraded sensing, and harsh terrain. The presented solution enables long-term autonomy with minimal human supervision by combining a powerful and independent single-agent autonomy stack, with higher level mission management operating over a flexible mesh network. The autonomy suite deployed on quadruped and wheeled robots was fully independent, freeing the human supervision to loosely supervise the mission and make high-impact strategic decisions. We also discuss lessons learned from fielding our system at the SubT Final Event, relating to vehicle versatility, system adaptability, and re-configurable communications.
description: Field Robotics special issue: DARPA Subterranean Challenge, Advancement and Lessons Learned from the Finals
Gene-level pharmacogenetic analysis on survival outcomes using gene-trait similarity regression
Creators: name: Tzeng, Jung-Ying
name: Lu, Wenbin
name: Hsu, Fang-Chi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Gene/pathway-based methods are drawing significant attention due to their usefulness in detecting rare and common variants that affect disease susceptibility. The biological mechanism of drug responses indicates that a gene-based analysis has even greater potential in pharmacogenetics. Motivated by a study from the Vitamin Intervention for Stroke Prevention (VISP) trial, we develop a gene-trait similarity regression for survival analysis to assess the effect of a gene or pathway on time-to-event outcomes. The similarity regression has a general framework that covers a range of survival models, such as the proportional hazards model and the proportional odds model. The inference procedure developed under the proportional hazards model is robust against model misspecification. We derive the equivalence between the similarity survival regression and a random effects model, which further unifies the current variance component-based methods. We demonstrate the effectiveness of the proposed method through simulation studies. In addition, we apply the method to the VISP trial data to identify the genes that exhibit an association with the risk of a recurrent stroke. The TCN2 gene was found to be associated with the recurrent stroke risk in the low-dose arm. This gene may impact recurrent stroke risk in response to cofactor therapy.
description: Published in at http://dx.doi.org/10.1214/14-AOAS735 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
The 2020/21 Affordable Inputs Program: Key Implementation Issues and Messages
Creators: name: Nyondo, Christone J.
name: Nyirenda, Zephaniah
name: Sentala, Thokozani
name: Muyanga, Milu
name: Mkumbwa, Solomon
name: Burke, William J.
name: Nyondo, Christone J.
name: Nyirenda, Zephaniah
name: Sentala, Thokozani
name: Muyanga, Milu
name: Mkumbwa, Solomon
name: Burke, William J.
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Food Security and Poverty
subject: International Development
subject: Policy implementation
subject: Agricultural inputs
subject: Input subsidy
subject: Subsidy beneficiaries
subject: Malawi

description: • Consider re-introducing legumes to the Affordable Inputs Program (AIP). Removal of legumes diminishes the programʼs contribution to farm productivity, incomes and nutrition. • Delays in planning and implementation hinder the programʼs effectiveness. • Invest time and resources to update the beneficiary database that is aligned to the National Registration Bureau to increase implementation efficiency. • Insufficient sensitization of beneficiaries and input suppliers hampered the AIP in its inaugural year regarding how benefits would be distributed and redeemed. • Upgrade the AIP mobile application to allow for manual and offline input redemptions through the reference number on the national ID card to reduce the effect of network disruptions. • Alternatively, consider a manual backstopping system for the electronic identification and redemption system to circumvent network disruptions. • Strengthen the enforcement of input supplier contracts to ensure timely distribution. • Align AIP inputs supplies with seasonality, agro-ecological zones, and farmer preferences. • Consider only contracting well established and reputable suppliers to supply subsidized inputs to avoid delayed deliveries. • Open AIP outlet markets as early as during the harvest season, when farmers have enough liquidity to purchase inputs. • Incentivize agro-dealers to supply subsidized inputs to assigned areas throughout the year.
Consideration of stress stiffening and material reorientation in modal space based finite element solutions
Creators: name: Marinkovic, D.
name: Zehn, M.
Publisher: name: Физическая мезомеханика
Year: 2017
Subjects: MODEL REDUCTION
MODAL SPACE
GEOMETRIC NONLINEARITY
FINITE ELEMENT METHOD
STRUCTURAL DEFORMATION
УМЕНЬШЕНИЕ РАЗМЕРНОСТИ МОДЕЛИ
МОДАЛЬНОЕ ПРОСТРАНСТВО
ГЕОМЕТРИЧЕСКАЯ НЕЛИНЕЙНОСТЬ
МЕТОД КОНЕЧНЫХ ЭЛЕМЕНТОВ
СТРУКТУРНАЯ ДЕФОРМАЦИЯ

description: Structural deformations are an important aspect of many engineering tasks. They are typically resolved as “off-line” finite element computations with accuracy set as the primary objective. Though high computational efficiency is always an important aspect, in certain applications its priority is of equal or similar importance as the accuracy itself. This paper tackles the problem of proper extension of linear models with the objective of keeping high numerical efficiency and covering moderate geometric nonlinearities. Modal-space based approach is addressed as one of the standard techniques for robust model reduction. Two extensions are proposed to account for moderate geometric nonlinearities in modal-space based solutions, one accounting for stress stiffening effect and the other for moderate material rigid-body rotations during deformation. Examples are provided to demonstrate the applicability and discuss the aspects of proposed techniques.
Programa integral basado en la participación de agentes de la sociedad y del sistema de justicia para el tratamiento penitenciario
Creators: name: Pérez Arce, Christian Nelio
name: Sandoval, Sorel Ponce
Publisher: name: figshare
Year: 2022
Subjects: subject: 180121 Legal Practice, Lawyering and the Legal Profession
subject: FOS: Law
subject: 180110 Criminal Law and Procedure

description: El presente trabajo, tiene su génesis en la realidad penitenciaria del Estado Plurinacional de Bolivia, en el cual se identifican los antecedentes y particularidades del tratamiento penitenciario, para posteriormente construir una propuesta integral destinada a mejorar el mismo.
Comprehensive $ab$ $initio$ investigation of the phase diagram of quasi-one-dimensional molecular solids
Creators: name: Yoshimi, Kazuyoshi
name: Misawa, Takahiro
name: Tsumuraya, Takao
name: Seo, Hitoshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: An $ab$ $initio$ investigation of the family of molecular compounds TM$_2$$X$ is conducted, where TM is either TMTSF or TMTTF and $X$ takes centrosymmetric monovalent anions. By deriving the extended Hubbard-type Hamiltonians from first-principles band calculations and evaluating not only the intermolecular transfer integrals but also the Coulomb parameters, we discuss their material dependence in the unified phase diagram. Furthermore, we apply the many-variable variational Monte Carlo method to accurately determine the symmetry-breaking phase transitions, and show the development of the charge and spin orderings. We show that the material-dependent parameter can be taken as the correlation effect, represented by the value of the screened on-site Coulomb interaction $U$ relative to the intrachain transfer integrals, for the comprehensive understanding of the spin and charge ordering in this system.
description: 9 pages, 5 figures, and 2 tables
Commodity Futures Swap Model
Creators: name: Lee, David
Publisher: name: Zenodo
Year: 2022
Subjects: Commodity Futures Swap Model

description: A commodity futures (contract) swap (CFS) is a linear portfolio of forward contracts on commodity futures (contract) (FCCF). An FCCF belongs to the category of arithmetic average forward contracts. Due to the linearity with respect to underlying asset prices, an arithmetic average forward contract is just a linear combination of ordinary forward contracts.
description: https://finpricing.com/lib/FxAccumulator.html
Evaluation and development of expanded equations based on Takayanagi model for tensile modulus of polymer nanocomposites assuming the formation of percolating networks
Creators: name: Zare, Y.
name: Rhee, K.Y.
Publisher: name: Физическая мезомеханика
Year: 2017
Subjects: POLYMER NANOCOMPOSITES
NETWORK STRUCTURE
TENSILE MODULUS
PERCOLATION THRESHOLD
ПОЛИМЕРНЫЕ НАНОКОМПОЗИТЫ
СЕТЧАТАЯ СТРУКТУРА
МОДУЛЬ УПРУГОСТИ ПРИ РАСТЯЖЕНИИ
ПОРОГ ПЕРКОЛЯЦИИ

description: In this study, the tensile modulus of polymer nanocomposites is analyzed by the development of expanded Takayanagi models considering the fractions of networked and dispersed nanoparticles above the percolation threshold. The tensile moduli of networked and dispersed phases are calculated by suitable models. This study focuses on “polymer-carbon nanotubes” nanocomposites, but the developed model can be applied for samples reinforcing with long fillers such as clay and graphene. The expanded Takayanagi model suggests two different forms which are evaluated by the experimental results of “polymer-carbon nanotubes” nanocomposites. Only one form shows the best results compared to the experimental data, whereas another form underestimates the modulus. The developed model (correct form) shows that the fraction of filler network meaningfully changes the reinforcement of nanocomposites. The network level and other correlated parameters with the percolation threshold can be calculated by comparing the experimental data with the developed model. The logical outputs confirm the correct development of Takayanagi model assuming the network and dispersion of nanoparticles in polymer nanocomposites.
Design and Validation of a Multi-Arm Relocatable Manipulator for Space Applications
Creators: name: Hoffman, Enrico Mingo
name: Laurenzi, Arturo
name: Ruscelli, Francesco
name: Rossini, Luca
name: Baccelliere, Lorenzo
name: Antonucci, Davide
name: Margan, Alessio
name: Guria, Paolo
name: Migliorini, Marco
name: Cordasco, Stefano
name: Raiola, Gennaro
name: Muratore, Luca
name: Rodrigo, Joaquín Estremera
name: Rusconi, Andrea
name: Sangiovanni, Guido
name: Tsagarakis, Nikos G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This work presents the computational design and validation of the Multi-Arm Relocatable Manipulator (MARM), a three-limb robot for space applications, with particular reference to the MIRROR (i.e., the Multi-arm Installation Robot for Readying ORUs and Reflectors) use-case scenario as proposed by the European Space Agency. A holistic computational design and validation pipeline is proposed, with the aim of comparing different limb designs, as well as ensuring that valid limb candidates enable MARM to perform the complex loco-manipulation tasks required. Motivated by the task complexity in terms of kinematic reachability, (self)-collision avoidance, contact wrench limits, and motor torque limits affecting Earth experiments, this work leverages on multiple state-of-art planning and control approaches to aid the robot design and validation. These include sampling-based planning on manifolds, non-linear trajectory optimization, and quadratic programs for inverse dynamics computations with constraints. Finally, we present the attained MARM design and conduct preliminary tests for hardware validation through a set of lab experiments.
description: 7 pages (last page references), 15 figures, accepted to the IEEE International Conference on Robotics and Automation (ICRA) 2023
Exact results for a simple epidemic model on a directed network: Explorations of a system in a non-equilibrium steady state
Creators: name: Shkarayev, Maxim S.
name: Zia, R. K. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Motivated by fundamental issues in non-equilibrium statistical mechanics (NESM), we study the venerable susceptible-infected (SIS) model of disease spreading in an idealized, simple setting. Using Monte Carlo and analytic techniques, we consider a fully connected, uni-directional network of odd number of nodes, each having an equal number of in- and out-degrees. With the standard SIS dynamics at high infection rates, this system settles into an active non-equilibrium steady state. We find the exact probability distribution and explore its implications for NESM, such as the presence of persistent probability currents.
D2.1: Enrichments of monitoring tools to track and compare float configurations and estimate life expectancies
Creators: name: Cancouët, Romain
name: Arduini Plaisant, Luca
name: Garcia Juan, Andrea
name: Belbéoch, Mathieu
name: Siiriä, Simo-Matti
Publisher: name: Zenodo
Year: 2020

description: Report that aims to provide the means to review Argo float missions sampling, configuration and technical parameters, that may have a significant impact on float reliability. Methodologies and results of different survival rates computations will be also discussed.
Transverse thermoelectric transport in a model of many competing order parameters
Creators: name: Wachtel, Gideon
name: Orgad, Dror
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Coexisting fluctuations towards various ordered states are ubiquitous in strongly correlated electronic systems. In particular, measurements of underdoped cuprate high-temperature superconductors reveal evidence for short range charge order in parallel to large superconducting fluctuations. Here we use a non-linear sigma model to describe a system with N competing orders, and calculate its transverse thermoelectric transport coefficient in the analytically tractable limit of large N . Our results, which determine the contribution of order parameter fluctuations to the Nernst signal, are appropriate for high temperatures in the case of finite N . They are similar to previously obtained results within a model of Gaussian superconducting fluctuations.
description: 11 pages, 7 figures
Long Spin Coherence and Relaxation Times in Nanodiamonds Milled from Polycrystalline $^{12}$C Diamond
Creators: name: March, James E
name: Wood, Benjamin D
name: Stephen, Colin J
name: Fervenza, Laura Durán
name: Breeze, Ben G
name: Mandal, Soumen
name: Edmonds, Andrew M
name: Twitchen, Daniel J
name: Markham, Matthew L
name: Williams, Oliver A
name: Morley, Gavin W
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The negatively charged nitrogen-vacancy centre (NV$^-$) in diamond has been utilized in a wide variety of sensing applications. The centre's long spin coherence and relaxation times ($T_2^*$, $T_2$ and $T_1$) at room temperature are crucial to this, as they often limit sensitivity. Using NV$^-$ centres in nanodiamonds allows for operations in environments inaccessible to bulk diamond, such as intracellular sensing. We report long spin coherence and relaxation times at room temperature for single NV$^-$ centres in isotopically-purified polycrystalline ball-milled nanodiamonds. Using a spin-locking pulse sequence, we observe spin coherence times, $T_2$, up 786 $\pm$ 200 $μ$s. We also measure $T_2^*$ times up to 2.06 $\pm$ 0.24 $μ$s and $T_1$ times up to 4.32 $\pm$ 0.60 ms. Scanning electron microscopy and atomic force microscopy measurements show that the diamond containing the NV$^{-}$ centre with the longest $T_1$ time is smaller than 100 nm. EPR measurements give an N$_{s}$$^{0}$ concentration of 0.15 $\pm$ 0.02 ppm for the nanodiamond sample.
description: 13 pages, 3 figures
Die Enzyklika "Meminisse iuvat" für den Frieden in der Welt und die Freiheit der Kirche (14.7.1958)
Creators: name: Pius XII., Papst
Publisher: name: Herder Korrespondenz
Year: 1970

description: Herder Korrespondenz, Bd. 12 Nr. 12 (1957): Herder Korrespondenz, Band 12, Heft 12
Distributional Impacts of Tobacco Cultivation in Malawi
Creators: name: Shah, Murnal
name: Ricker-Gilbert, Jacob
name: Khonje, Makaiko
name: Shah, Murnal
name: Ricker-Gilbert, Jacob
name: Khonje, Makaiko
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Food Security and Poverty
subject: International Development
subject: Tobacco
subject: Smallholder income
subject: Income inequality
subject: Malawi

description: • This brief investigates the distributional impacts of smallholder tobacco cultivation in Malawi between 2009/10 and 2018/19. • Households who grew tobacco during that time period were wealthier than the rest of the population • Households in the bottom asset quartile increased tobacco yields by 62% over this time period. • Biggest winners were those in the top asset quartile. They increased area planted by 41% and yields by 49% on average. • It will be very difficult and costly to move the wealthiest of the remaining 5% of smallholders out of tobacco cultivation. • May be potential to move those who are in the poorest 50% of the asset distribution that still grow tobacco if better livelihood opportunities can be found for them.
Shubnikov-de Haas oscillations from topological surface states of metallic Bi$_2$Se$_{2.1}$Te$_{0.9}$
Creators: name: Shrestha, Keshav
name: Marinova, Vera
name: Lorenz, Bernd
name: Chu, Paul C. W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have studied the quantum oscillations in the conductivity of metallic, p-type Bi$_2$Se$_{2.1}$Te$_{0.9}$. The dependence of the oscillations on the angle of the magnetic field with the surface as well as the Berry phase determined from the Landau level fan plot indicate that the observed oscillations arise from surface carriers with the characteristic Dirac dispersion. Several quantities characterizing the surface conduction are calculated employing the Lifshitz-Kosevich theory. The low value of the Fermi energy with respect to the Dirac point is consistent with the metallic character of the bulk hole carriers. We conclude that, due to the peculiar shape of the valence band, the Shubnikov-de Haas oscillations of the bulk carriers are shifted to higher magnetic fields which allows for the detection of the quantum oscillations from the topological surface states at lower field.
Valuative lattices and spectra
Creators: name: Lombardi, Henri
name: Mahboubi, Assia
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 03Fxx 13XX 18Fxx

description: The first part of the present article consists in a survey about the dynamical constructive method designed using dynamical theories and dynamical algebraic structures. Dynamical methods uncovers a hidden computational content for numerous abstract objects of classical mathematics, which seem a priori inaccessible constructively, e.g., the algebraic closure of a (discrete) field. When a proof in classical mathematics uses these abstract objects and results in a concrete outcome, dynamical methods generally make possible to discover an algorithm for this concrete outcome. The second part of the article applies this dynamical method to the theory of divisibility. We compare two notions of valuative spectra present in the literature and we introduce a third notion, which is implicit in an article devoted to the dynamical theory of algebraically closed discrete valued fields. The two first notions are respectively due to Huber \& Knebusch and to Coquand. We prove that the corresponding valuative lattices are essentially the same. We establish formal Valuativestellensätze corresponding to these theories, and we compare the various resulting notions of valuative dimensions.
description: This file contains also a French version of the paper. English version appears in the Proceedings of Graz Conference on Rings and Factorizations 2021. Title: Algebraic, Number Theoretic, and Topological Aspects of Ring Theory. Editors: Jean-Luc Chabert, Marco Fontana, Sophie Frisch, Sarah Glaz, Keith Johnson. Springer 2023 ISBN 978-3-031-28846-3 DOI 10.1007/978-3-031-28847-0
Chronicle Causes for the Failure of the Afghan Government: Past Imperfect and Future Tense of Afghanistan
Creators: name: Hashimy, Sayed Qudrat
Publisher: name: figshare
Year: 2023
Subjects: Constitutional law
Public international law
International criminal law
International trade and investment law
International humanitarian and human rights law
International and comparative law not elsewhere classified
Conflict of laws (incl. private international law)

description: This article examines the chronicle causes that fuelled the collapse of the Afghan government and the contention of this paper is to highlight what went wrong, that Afghanistan experienced with the failure of the Constitution 2004 and the republic also dissolved. The study employed doctrinal legal research in which normative approaches were to evaluate the literature to acquire the required legal propositions. The literature gathered and used in this study will include secondary, primary, and legal documents.
Recognition of Defective Mineral Wool Using Pruned ResNet Models
Creators: name: Rafiei, Mehdi
name: Tran, Dat Thanh
name: Iosifidis, Alexandros
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Mineral wool production is a non-linear process that makes it hard to control the final quality. Therefore, having a non-destructive method to analyze the product quality and recognize defective products is critical. For this purpose, we developed a visual quality control system for mineral wool. X-ray images of wool specimens were collected to create a training set of defective and non-defective samples. Afterward, we developed several recognition models based on the ResNet architecture to find the most efficient model. In order to have a light-weight and fast inference model for real-life applicability, two structural pruning methods are applied to the classifiers. Considering the low quantity of the dataset, cross-validation and augmentation methods are used during the training. As a result, we obtained a model with more than 98% accuracy, which in comparison to the current procedure used at the company, it can recognize 20% more defective products.
description: 6 pages, 5 figures, 3 tables Submitted on IEEE Transactions on Industrial Informatics
From partial data to out-of-sample parameter and observation estimation with Diffusion Maps and Geometric Harmonics
Creators: name: Koronaki, Eleni D.
name: Evangelou, Nikolaos
name: Psarellis, Yorgos M.
name: Boudouvis, Andreas G.
name: Kevrekidis, Ioannis G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: A data-driven framework is presented, that enables the prediction of quantities, either observations or parameters, given sufficient partial data. The framework is illustrated via a computational model of the deposition of Cu in a Chemical Vapor Deposition (CVD) reactor, where the reactor pressure, the deposition temperature and feed mass flow rate are important process parameters that determine the outcome of the process. The sampled observations are high-dimensional vectors containing the outputs of a detailed CFD steady-state model of the process, i.e. the values of velocity, pressure, temperature, and species mass fractions at each point in the discretization. A machine learning workflow is presented, able to predict out-of-sample (a) observations (e.g. mass fraction in the reactor) given process parameters (e.g. inlet temperature); (b) process parameters given observation data; and (c) partial observations (e.g. temperature in the reactor) given other partial observations (e.g. mass fraction in the reactor). The proposed workflow relies on the manifold learning schemes Diffusion Maps and the associated Geometric Harmonics. Diffusion Maps is used for discovering a reduced representation of the available data, and Geometric Harmonics for extending functions defined on the manifold. In our work a special use case of Geometric Harmonics is formulated and implemented, which we call Double Diffusion Maps, to map from the reduced representation back to (partial) observations and process parameters. A comparison of our manifold learning scheme to the traditional Gappy-POD approach is provided: ours can be thought of as a "Gappy DMAP" approach. The presented methodology is easily transferable to application domains beyond reactor engineering.
Direct CP violation in $τ^\pm\rightarrow K^\pm ρ^0 (ω)ν_τ\rightarrow K^\pm π^+π^-ν_τ$
Creators: name: Wang, Chao
name: Guo, Xin-Heng
name: Liu, Ying
name: Li, Rui-Cheng
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the direct CP violation in the $τ^\pm\rightarrow K^\pm ρ^0 (ω)ν_τ\rightarrow K^\pm π^+π^-ν_τ$ decay process in the Standard Model. An interesting mechanism involving the charge symmetry violating mixing between $ρ^0$ and $ω$ is applied to enlarge the CP asymmetry. With this mechanism, the maximum differential and localized integrated CP asymmetries can reach $-(5.6^{+2.9}_{-1.7})\times10^{-12}$ and $6.3^{+2.4}_{-3.3}\times 10^{-11}$, respectively, which still leave plenty room for CP-violating New Physics to be discovered through this process.
Joint Data and Feature Augmentation for Self-Supervised Representation Learning on Point Clouds
Creators: name: Lu, Zhuheng
name: Dai, Yuewei
name: Li, Weiqing
name: Su, Zhiyong
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: To deal with the exhausting annotations, self-supervised representation learning from unlabeled point clouds has drawn much attention, especially centered on augmentation-based contrastive methods. However, specific augmentations hardly produce sufficient transferability to high-level tasks on different datasets. Besides, augmentations on point clouds may also change underlying semantics. To address the issues, we propose a simple but efficient augmentation fusion contrastive learning framework to combine data augmentations in Euclidean space and feature augmentations in feature space. In particular, we propose a data augmentation method based on sampling and graph generation. Meanwhile, we design a data augmentation network to enable a correspondence of representations by maximizing consistency between augmented graph pairs. We further design a feature augmentation network that encourages the model to learn representations invariant to the perturbations using an encoder perturbation. We comprehensively conduct extensive object classification experiments and object part segmentation experiments to validate the transferability of the proposed framework. Experimental results demonstrate that the proposed framework is effective to learn the point cloud representation in a self-supervised manner, and yields state-of-the-art results in the community. The source code is publicly available at: https://zhiyongsu.github.io/Project/AFSRL.html.
Daughters of polycystic ovary syndrome pregnancies and androgen levels in puberty: a Meta-analysis
Creators: name: Valsamakis, Georgios
name: Violetis, Odyssefs
name: Chatzakis, Christos
name: Triantafyllidou, Olga
name: Eleftheriades, Makarios
name: Lambrinoudaki, Irene
name: Mastorakos, George
name: Vlahos, Nikos F.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Purpose: To provide an overview and critical analysis of the literature related to the circulating androgen levels of daughters of PCOS mothers during prepubertal and pubertal stage who have not yet been diagnosed with PCOS or precocious puberty. Methods: We critically considered and meta-analyzed observational studies comparing androgens concentration in daughters of PCOS mothers compared to daughters of mothers without PCOS. A literature search was conducted in MEDLINE, Scopus and other sources from 01/09/2021 until 01/12/2021. The study followed the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA). The primary outcome included total testosterone levels whereas the secondary outcomes included 17a-hydroxyprogesterone (17-OHP), androstenedione (Δ4Α) and Sex Hormone Binding Globulin (SHBG) levels respectively. Results: Our search yielded 1073 studies, 9 of which were included in our analysis. The results are presented differently according to pubertal stage. Pubertal daughters of PCOS mothers exhibited significantly higher total testosterone (pooled mean difference 14.95 (95%CI: 6.98 to 22.93), higher 17-OHP (pooled mean difference 0.11 (95%CI: 0.02 to 0.20) and lower SHBG levels (pooled mean difference −10.48 (95%CI: −16.46 to −4.61). Instead, prepubertal daughters of PCOS mothers presented greater SHBG levels (pooled mean difference 7.79 (95%CI: 0.03 to 15.54) compared to controls. No difference was found in Δ4Α levels in both groups. Conclusion: The onset of puberty is a critical point in the development of the disease and an early intervention may be imperative.
Search for a spin-nematic phase in the quasi-one-dimensional frustrated magnet LiCuVO$_4$
Creators: name: Büttgen, N.
name: Nawa, K.
name: Fujita, T.
name: Hagiwara, M.
name: Kuhns, P.
name: Prokofiev, A.
name: Reyes, A. P.
name: Svistov, L. E.
name: Yoshimura, K.
name: Takigawa, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have performed NMR experiments on the quasi one-dimensional frustrated spin-1/2 system LiCuVO$_4$ in magnetic fields $H$ applied along the c-axis up to field values near the saturation field $H_{\rm sat}$. For the field range $H_{\rm c2} 41.4$T, indicating that the majority of magnetic moments in LiCuVO$_4$ are already saturated in this field range. This result is inconsistent with the previously observed linear field dependence of the magnetization $M(H)$ for $H_{\rm c3}
description: 8 pages, 9 figures