Miracle-dz/UniFAR-FTUs huggingface dataset:
Non–uniqueness in two–dimensional water wave problems: numerical evidence and geometrical restrictions

In this paper numerical evidence for the existence of eigenvalues in a particular two‐dimensional water wave problem is presented, together with computations of the eigenvalues themselves. The geometry considered is that of a pair of identical inclined surface‐piercing barriers arranged symmetrically about a vertical line in infinitely deep water. Only oscillations symmetric about this line are considered so that the geometry is equivalent to an inclined surface‐piercing barrier next to a vertical wall. The problem is formulated as a hypersingular integral equation which is then solved numerically by expanding the unknown function, corresponding to the jump in potential across the barrier, as a series of Chebyshev polynomials. We also prove that for a more general class of bodies consisting of a pair of surface‐piercing bodies placed symmetrically about a vertical line midway between them, there are ranges of the spectral parameter for which no eigenvalues exist. The numerically computed eigenvalues for the inclined barriers are consistent with these results.
MDGNN: M ETAPATH - BASED D ECOUPLED G RAPH N EURAL N ETWORK FOR MAG240M-LSC

Large-scale graph data have received more attention from researchers in recent years. After the successful host of the first OGB-LSC (KDD Cup 2021), the MAG240M track is retained for the second OGB-LSC at NeurIPS 2022. MAG240M is a heterogeneous graph dataset with more than 240 million nodes, including papers, authors, and institutions. In the KDD Cup 2021, the top two methods, R_UniMP and MPNN&BGRL, are message-passing-based graph neural networks, which require much time (e.g., a few GPU days) to train one model on the MAG240M dataset. However, we find that decoupled graph neural networks can obtain comparable performance with an order of magnitude less training time. Inspired by MPLP, the 4th solution of KDD Cup 2021, we propose a metapath-based decoupled graph neural network (MDGNN), which incorporates more effective features to get better results. Our solution finally gets an award-level (top-3) performance on the MAG240M track of OGB-LSC 2022.
Coverage Maximization using Multi-Objective Optimization Approach for Wireless Sensor Network in Real Time Environment

The most important issue of Quality of Service is network connectivity and coverage of sensing in the design of Wireless Sensor Network. The target area is monitoring or tracking by the sensors, called as coverage. Where the human intrusion is difficult or impossible in a hostile environment then the sensors are dropped by airplanes. In this situation sensors cannot be same in the whole area, therefore some area may be covered or uncovered and some sensors may be overlapped. These redundant sensors improve coverage and connectivity, but increase energy depletion. Monitoring of the coverage holes is an important task because of their harmful and denying effect on the WSNs. In the present paper, we have proposed a model to extend the network lifetime and maximum coverage rate using multi-objective optimization approach. This model can achieve maximum coverage, minimum energy consumption and maximize network lifetime. This paper considers non-dominated sorting genetic algorithm (NSGA-II) for optimizing coverage problems. The results of the simulation show that the proposed method can improve the coverage probability and lifetime of the network at the same time can maintain the connectivity of the network.
Robust H/sub /spl infin// reliable control for linear state delayed systems with parameter uncertainty

This paper focuses on the problem of robust H/sub /spl infin// reliable control design for linear systems with state delay and parameter uncertainty. The goal of this problem is to design the state feedback controller such that, for all admissible uncertainties as well as actuator failures, the plant is robustly stabilized and the prescribed H/sub /spl infin//-norm bound constraint on disturbance attenuation is guaranteed, simultaneously. It is assumed that the parameter uncertainties are norm-bounded and the actuator failures occur among a prespecified subset of actuators. A simple, effective, modified algebraic Riccati equation approach is developed to solve the addressed problem. The resulting time-delay control systems are reliable in that they provide guaranteed robust stability and H/sub /spl infin// performance not only when all control components are operational, but also in case of actuator failures. An illustrative example is presented to demonstrate the applicability of the proposed method.
Optimal Synthesis of Point Contact Restraint

The object of this paper is to develop a procedure that will allow the establishment of necessary and sufficient point contacts on a rigid body to ensure that the body has any desired state of instantaneous motion or restraint. The screw space and its sub-spaces are employed; these are vector spaces but not Euclidean spaces. The states of restraint and instantaneous motion of a body restrained by a system of screws of point contacts are specified by reciprocal sub-spaces of the screw space. This leads to a synthesis procedure for restraint of a rigid body by means of point contacts. The existence and uniqueness of the synthesis solution are discussed, and necessary and sufficient conditions for a realizable surface of a kinematic pair are given. Finally, two quality measures for a feasible set of screws are defined. One represents the uniformity of the distribution of internal forces while the other indicates the restraint's ability to resist external forces.
Steady-state and multiple cracking of short random fiber composites

This paper analyzes the pseudostrain‐hardening phenomenon of brittle matrix composites reinforced with discontinuous flexible and randomly distributed fibers, based on a cohesive crack‐mechanics approach. The first crack strength and strain are derived in terms of fiber, matrix, and interface micromechanical properties. Conditions for steady‐state cracking and multiple cracking are found to depend on two nondimensionalized parameters that embody all relevant material micromechanical parameters. The results are therefore quite general and applicable to a variety of composite‐material systems. Phrased in terms of a failure‐mechanism map, various uniaxial load‐deformation behaviors for discontinuous fiber composites can be predicted. The influence of a snubbing effect due to local fiber/matrix interaction for randomly oriented crack‐bridging fibers on the composite properties is also studied.
Digital speckle reduction in holograms: a comparison between methods

Digital holography, as any other coherent imaging modalities, is subject to speckle noise. Speckles may degrade significantly the image quality, therefore many optical and digital techniques were developed to suppress the speckles. In this paper we present a comparison between six digital speckle filtering techniques used for digital holography.
Variational Monte Carlo study of magnetic states in the periodic Anderson model

We study the magnetic states of the periodic Anderson model with a finite Coulomb interaction between f electrons on a square lattice by applying variational Monte Carlo method. We consider Gutzwiller wavefunctions for the paramagnetic, antiferromagnetic, ferromagnetic, and charge density wave states. We find an antiferromagnetic phase around half-filling. There is a phase transition accompanying change in the Fermi-surface topology in this antiferromagnetic phase. We also study a case away from half-filling, and find a ferromagnetic state as the ground state there.
Dependent scattering of an obliquely incident plane wave by a collection of parallel cylinders

Scattering of an obliquely incident electromagnetic wave by an arbitrary configuration of parallel, nonoverlapping infinite cylinders is considered in this study. The incident wave is plane polarized with either of the field vectors parallel to the axes of the cylinders. The solution to the scalar wave equations is obtained by using the boundary value method. The total wave potentials in the vicinity of a cylinder is constructed by including the contributions from the primary incident wave and the scattered waves from all the cylinders. Expressions for the coefficients of the scattered wave potentials are obtained in terms of those for independent scattering. Numerical results are presented to illustrate the effect of dependent scattering by an assembly of cylinders.
Time-domain modeling and filtering behaviour of guided-wave optics by Hertzian potentials

This work analyzes a new efficient numerical algorithm for evaluating the time-domain electromagnetic (EM) field and the filtering behaviour of periodic waveguides, by reducing the number of equations to solve. The scalar Helmholtz-equation is utilized in order to determine the electric and magnetic Hertzian-potentials that represent the EM field. The principle of the method is demonstrated by a simple 2D application to a multilayer dielectric stack at optical frequencies.
CONSTRUCTION OF ANATOMICALLY ACCURATE FINITE ELEMENT MODELS OF THE HUMAN HAND AND A RAT KIDNEY

The aim of the paper is to develop a method for generating three-dimensional (3D) models of organs from medical images (computerized tomography (CT) images, magnetic resonance imaging (MRI), etc.). There were three main steps in the development of the model: the first step was image processing. Different image-processing operators including blurring, sharpening, edge detection, region segmentation, mathematical morphology transformation, rotation, and movement of the kidney slices were performed to automatically construct the accurate boundary information. The second step was mesh generation of each slice based on the boundary information by using the transfinite interpolation (TFI) technique. In this paper, the TFI method was improved to create grids from images directly. The last step was reconstructing the models by stacking the 2D grid models and visualizing the result in the Advanced Visual System (AVS) software. In order to verify the effectiveness of this method, the finite element (FE) models of a rat kidney, human hand, and blood vessels were reconstructed and good results were obtained.
Evaluating the Underlying Gender Bias in Contextualized Word Embeddings

Gender bias is highly impacting natural language processing applications. Word embeddings have clearly been proven both to keep and amplify gender biases that are present in current data sources. Recently, contextualized word embeddings have enhanced previous word embedding techniques by computing word vector representations dependent on the sentence they appear in. In this paper, we study the impact of this conceptual change in the word embedding computation in relation with gender bias. Our analysis includes different measures previously applied in the literature to standard word embeddings. Our findings suggest that contextualized word embeddings are less biased than standard ones even when the latter are debiased.
The far-field directionality of partially coherent flat-topped beams propagating through atmospheric turbulence

The far-field directionality of partially coherent flat-topped beams propagating through atmospheric turbulence is studied. The closed-form expressions for the mean squared beam width and angular spread of partially coherent flat-topped beams propagating through atmospheric turbulence are derived. It is shown that two partially coherent flat-topped beams may generate the same angular spread, and there exist equivalent partially coherent flat-topped beams which may have the same far-field directionality as a fully coherent Gaussian beam in free space and also in atmospheric turbulence. The far-field directionality of Gaussian Schell-model (GSM) beams in atmospheric turbulence is treated as a special case of partially coherent flat-topped beams. The theoretical results are illustrated by numerical examples and interpreted physically.
Methanol masers in the Herschel era Putting them in the star formation context

Abstract Methanol masers are known to be among the most reliable tracers of high-mass stars in early stages of evolution. A number of searches across the Galaxy has yielded to date, a complete census of those masers in two thirds of the Milky Way, providing a catalogue of some 800 sources to be studied in depth. In particular, it is important to characterise the physical properties of the objects hosting methanol masers, and this is possible today using data from the Herschel Space Observatory (HSO). The exceptional spatial resolution of HSO and its wavelength coverage are perfectly tuned to put the methanol maser phase into its star formation context. This paper presents results on the characterisation of methanol maser hosts using Herschel data from the Hi-GAL project, an Open Time Key Project to survey the inner Galactic plane at 5 wavelengths between 70 and 500 μm.
X-ray characterization of buried allotaxially grown CoSi2 layers in Si(100)

An x-ray study of the interface morphology and lattice parameters of buried expitaxial CoSi2 layers in Si(100) is presented. Specular reflectivity, diffuse and crystal truncation rod scattering, together with grazing incidence diffraction yield detailed information about the interface quality and lattice mismatch. It turns out that the CoSi2 interfaces are considerably smoothened by an annealing step at 1150 °C. Also the in-plane correlation length of the roughness increases yielding laterally smoother interfaces. While the perpendicular lattice parameter is between that of a free relaxed and a pseudomorphic structure and a linear contraction as function of the annealing temperature is obtained, grazing incidence diffraction reveals the opposite effect for the in-plane lattice mismatch.
Exact critical values of the symmetric fourth L function and vector valued Siegel modular forms

Exact critical values of symmetric fourth L function of the Ramanujan Delta function ∆ were conjectured by Don Zagier in 1977. They are given as products of explicit rational numbers, powers of π , and the cube of the inner product of ∆. In this paper, we prove that the ratio of these critical values are as conjectured by showing that the critical values are products of the same explicit rational numbers, powers of π , and the inner product of some vector valued Siegel modular form of degree two. Our method is based on the Kim-Ramakrishnan-Shahidi lifting, the pullback formulas, and diﬀerential operators which preserve automorphy under restriction of domains. We also show a congruence between a lift and a non-lift. Furthermore, we show the algebraicity of the critical values of the symmetric fourth L function of any elliptic modular form and give some conjectures in general case.
Biofilm Control With New Microparticles With Immobilized Biocide

Biofouling of heat exchangers, pipes, and valves isan unavoidable hazard in industrial plants. Operators have to face the problems of cleaning the fouled equipment, treating the wastewater from the discharge of antimicrobial cleaning agents (biocides, surfactants, etc.), and protecting the consumer from contamination risks. To tackle these problems, a targeted cleaning technique is here proposed that unites efficient removal of the biological deposits (specifically targeting the places where deposits grow) with low consumption of cleaning agents. The goal is to develop microparticles with functionalized surfaces that act as carriers of biocidal molecules, attach to biofilm surfaces, and deliver the biocide on the desired sites. This novel biofilm control technology may provide cost-effective, environmental- and health-friendly strategies that will improve operational efficacy. Previously, our group had performed studies with polystyrene (PS) microparticles functionalized with the biocide benzyldimethyldodecylammonium chloride (BDMDAC) against biofilms of Pseudomonas fluorescens. BDMDAC-functionalized microparticles were prepared using the layer-by-layer self-assembly (LBL) technique. Since PS particles are very expensive, our group tested calcium carbonate microparticles (CaCO3) (diameter: 3 μm), produced by the same LBL assembly technique. These microparticles have the advantage of being cheaper, porous, and highly abundant in nature. In this study, P. fluorescens biofilms were exposed to 6.33 mg/L and 11.75 mg/L of BDMDAC-coated CaCO3 microparticles for 60 min. This strategy promoted inactivation of 81.9% (6.33 mg/L) and 93.3 % (11.75 mg/L mg/L) of the total population. As a control, free BDMDAC was tested against P. fluorescens biofilms, demonstrating similar inactivation (p > 0.05) under the new strategy.
Generalized hierarchical bases: a Wavelet‐Ritz‐Galerkin framework for Lagrangian FEM

Purpose – This paper presents a novel framework for solving elliptic partial differential equations (PDEs) over irregularly spaced meshes on bounded domains.Design/methodology/approach – Second‐generation wavelet construction gives rise to a powerful generalization of the traditional hierarchical basis (HB) finite element method (FEM). A framework based on piecewise polynomial Lagrangian multiwavelets is used to generate customized multiresolution bases that have not only HB properties but also additional qualities.Findings – For the 1D Poisson problem, we propose – for any given order of approximation – a compact closed‐form wavelet basis that block‐diagonalizes the stiffness matrix. With this wavelet choice, all coupling between the coarse scale and detail scales in the matrix is eliminated. In contrast, traditional higher‐order (n>1) HB do not exhibit this property. We also achieve full scale‐decoupling for the 2D Poisson problem on an irregular mesh. No traditional HB has this quality in 2D.Research l.
Molecular abundances in the high-latitude molecular clouds

This paper presents CO, H/sub 2/CO, OH, and extinction data for several high-latitude molecular clouds (HLMCs) in an attempt to determine the molecular abundances and gas properties of a typical HLMC. The CO abundance with respect to H/sub 2/ is comparable to what is found for dark clouds. The H/sub 2/CO abundance is within a few factors of the values found in dark cloud surveys. The OH abundance in the HLMCs is an order of magnitude greater than the value determined for dark clouds. The data indicate that the HLMCs show abundance and column densities more similar to those of the dark clouds than to those of the diffuse clouds. 61 references.
Trees with Hamiltonian square

Plummer (see [2; p. 69]) conjectured that the square of every block is hamiltonian, and this has just been proved by Fleischner [1]. It was shown by Karaganis [3] that the cube of every connected graph, and hence the cube of every tree, is hamiltonian. Our present object is to characterize those trees whose square is hamiltonian in three equivalent ways. We follow the terminology and notation of the book [2]. In particular, the following concepts are used in stating our main result. A graph is hamiltonian if it has a cycle containing all its points. The graph with the same points as G, in which two points are adjacent if their distance in G is at most 2, is denoted by G 2 and is called the square of G. The subdivision graph S(G) is formed (Figure 1) by inserting a point of degree two on each line of G.
The neighborhood activation model of auditory word recognition

The neighborhood activation model (NAM) of auditory word recognition describes the processes by which a stimulus word is identified in the context of phonetically similar words activated in memory. Stimulus input activates a set of acoustic‐phonetic patterns in memory that must be discriminated and chosen among. These acoustic‐phonetic patterns receive activation levels proportional to their similarities to the stimulus input. The activation levels may then be adjusted by biases arising from higher‐level information, such as word frequency. The interaction of the bottom‐up sensory input and top‐down biasing information is assumed to take place within individual processing units called word decision units. These units monitor the activation levels of their acoustic‐phonetic patterns, any higher‐level information that may optimize decisions among the competing patterns, and the activity of all other word decision units. The NAM states that increasing the number of acoustic‐phonetic patterns activated in mem.
Estimating curvatures and the Darboux frame from unorganised noisy point cloud

Curvatures and the Darboux frame are useful tools for surface classification and 3D object recognition. However, it is still challenging for estimating these features on unorganised noisy points. A method is proposed to calculate these features from a general quadric surface fitted at each point. The TLS3L (total least squares on the three level sets) algorithm is introduced to permit fast, repeatable, and reliable fitting to the noisy input. The efficiency of the estimation is analysed theoretically and examined on several synthetic as well as real data sets. Comparative tests indicate that the proposed method excels the competitive ones.
The FU Orionis--Type Spectrum and Bipolar Outflow of Parsamyan 21

We present CCD images in the red and long-slit spectrograms of the young cometary nebula Parsamyan 21. The spectroscopic and far-infrared properties of its illuminating source are characteristic for an FU Orionis star. The spectrum is of type F5Iab with broad absorption lines and a broad, blueshifted P Cygni profile of Hα, reaching a velocity of −600 km s −1 at the blue edge of its absorption component. The star coincides with a cold IRAS source and is associated with a short bipolar Herbig-Haro outflow oriented along the axis of symmetry of the cometary nebula
Description and analysis of an algorithm for star identification, pointing, and tracking systems

Software for star field identification and star pointing and tracking is described. The software will be implemented in the guiding system of UVSTAR, a spectrograph/telescope system for UV astronomy and planetary physics that will operate as a Hitchhiker payload on the Shuttle. The software work with the wide-field CCD camera and an on-board stellar catalog. It is capable of (1) providing high accuracy (better than 2 arcsec) attitude determination from coarse (± 3 deg) initial knowledge of the pointing direction and (2) pointing toward the target. It is capable of tracking at the same high accuracy with a processing time of less than a few hundredths of a second. Simulation of observations and various types of tests are also discussed.