Miracle-dz/UniFAR-FTUs huggingface dataset:
Thermal conductivity of graphene ribbons from equilibrium molecular dynamics: Effect of ribbon width, edge roughness, and hydrogen termination

We use equilibrium molecular dynamic simulations to compute thermal conductivity of graphene nanoribbons with smooth and rough edges. We also study effects of hydrogen termination. We find that conductivity is the highest for smooth edges and is essentially the same for zigzag and armchair edges. In the case of rough edges, the thermal conductivity is a strong function of the ribbon width indicating the important effect of phonon scattering from the edge. Hydrogen termination also reduces conductivity by a significant amount.
Interacting columns: generating functions and scaling exponents

A model of self-interacting columns, related to models of partially directed walks and to histogram polygons, is considered. The generating function of this model is found in terms of q-deformed Bessel functions using a functional recursion scheme. A transition, related to a deflation-inflation transition seen in staircase polygons, or to a rough-smooth transition in a solid-on-solid model, is found, and its scaling exponents are found in the context of a tricritical scaling analysis. If the columns are also interacting with the horizontal axis, then the inflated or smooth phase is also found to undergo an adsorption transition. A special point exists where the model is critical with respect to both an adsorption transition and a deflation-inflation transition.
Adaptive Grid Refinement for Two-Dimensional and Three-Dimensional Nonhydrostatic Atmospheric Flow

Abstract Although atmospheric phenomena tend to be localized in both time and space, numerical models generally employ only uniform discretizations or fixed nested grids. An adaptive grid technique implemented in 2D and 3D nonhydrostatic elastic atmospheric models is described. The adaptive technique makes use of separate rectangular refinements to increase resolution where truncation error estimates are large. Multiple, rotated, overlapping grids are used along with an arbitrary number of discrete grid-refinement levels. Refinements are placed and removed automatically during the integration based an estimates of the truncation error in the evolving solution. The technique can be viewed as an extension of the nesting technique often used in atmospheric models. The adaptive model integrates the compressible, nonhydrostatic equations of motion. Although sound waves are not significant in the solution, they do constrain the time step. A splitting technique is used to accommodate the sound waves by advancing.
Slotted nanobeam microcavities enabling hybrid photonic devices

A theoretical investigation of the mode profiles, mode volumes and Q-factors of infiltrated slot nanobeam cavities is presented. General design principals are discussed. A gradual adjustment of the pore distance and pore diameter of the pores closest to the cavity leads to a considerable increase of the Q-factors. Surprisingly a maximum Q-factor of 100 000 is expected with a linear taper including only two pores. An estimate for the power threshold of optical bistable transmission behavior is given.
On proper orthogonal decomposition of randomly perturbed fields with applications to flow past a cylinder and natural convection over a horizontal plate

The connections between the random elements of a discrete random flow field and the uncertainty in the hierarchical set of its spatio-temporal scales, obtained by the symmetric version of the proper orthogonal decomposition (POD) method, are investigated. It is shown that the relevant statistics for the energy levels, the temporal modes and the spatial modes can be expressed in an explicit form as power series of the flow field standard deviation. Such expansions characterize accurately interesting phenomena of mixing between different flow scales. The basis of the present work is the assumption that the randomness is characterized by a Gaussian uncorrelated random field. Two applications of the theory developed are proposed: to the incompressible flow past a cylinder at Reynolds number $\mbox{\textit{Re}}\,{=}\,100$ and to the natural convective flow over an isothermal horizontal plate at Rayleigh number $\mbox{\textit{Ra}}\,{=}\,4.75\,{\times}\,10^6$. The theoretical predictions are confirmed well by Monte Carlo simulations and interesting relations between the random flows and the relevant statistics of their POD spatio-temporal scales are determined and discussed.
Probability Predictions of Geostrophic Winds

Abstract A network sampling theory developed previously is used to obtain limiting probabilities of geostrophic wind components predicted at 500 mb in several synoptic cases. Analogous probabilities are calculated for the kinetic energies of these components. Data are from an earlier study described in this Journal. An example of wind-probability forecasts is presented. Theoretical and empirical probabilities are found to agree satisfactorily. These results and others are discussed.
MENTORING AND ORGANIZATIONAL SURVIVAL OF DEPOSIT MONEY BANKS IN RIVERS STATE

The study investigated the relationship between mentoring and organizational survival of quoted deposit money banks in Rivers State. A sample of four hundred and fifty-seven respondents was drawn from the population of quoted deposit money banks in Rivers, Nigeria. The study utilized the cross-sectional research design. Data for the study were obtained using structured questionnaire. The obtained data were analyzed using Pearson’s Correlation Coefficient. The study affirms that mentoring play significant and substantial roles in adaptability, innovation and dynamic capability of quoted deposit money banks in Nigeria. It was recommended that mentoring methods, policies, and techniques should be promoted in the banking industry to promote easy adaptability and dynamic capability, which will help banks survive.
Conversion of chemically deposited photosensitive CdS thin films to n‐type by air annealing and ion exchange reaction

A method is presented for the deposition of CdS thin films of 0.05–0.7 μm thickness from solutions at 50–70 °C containing citratocadmium(II) complex ions and thiourea. The films show an optical band gap Eg≳2.6 eV. Optical transmittance is about 80% for photon energy <Eg. The dark conductivity of the films is of the order of 10−8 Ω−1 cm−1. The photosensitivity of these films is high, 106–107 under illumination with tungsten halogen light of 1 kW m−2. Annealing in air at 400–500 °C for 1 h converts the films to n type. It is possible to obtain sheet resistances of about 150 Ω for a 0.2 μm film (i.e., conductivity of 300 Ω−1 cm−1) by this process. Conversion of the films to n type is possible also by immersing the film in a 0.01 M HgCl2 solution for 15 min followed by air annealing for 1 h at 200 °C. The films show n‐type dark conductivity of ≂0.05 Ω−1 cm−1 and photoconductivity of ≂1 Ω−1 cm−1. X‐ray diffraction and x‐ray photoelectron spectroscopic depth profile studies on the films show that the modificati.
Prototype Implementation of the Algebraic Kernel

In this report we describe the current progress with respect to prototype implementations of algebraic kernels within the ACS project. More specifically, we report on: (1) the CGAL package Algebraic kernel for circles 2 2 aimed at providing the necessary algebraic functionality required for treating circular arcs; (2) our experience on implementing algebraic numbers originally in Maple and later on within the SYNAPS library; (3) the NumeriX library (part of the EXACUS project) which is a prototype implementation of a set of algebraic tools on univariate polynomials, needed to built an algebraic kernel and (4) a rough CGAL-like prototype implementation of a set of algebraic tools on univariate polynomials.
Tunnel magnetoresistance in magnetic tunnel junctions with a ZnS barrier

We report on the junction magnetoresistance in magnetic tunnel junctions of the hard–soft type with magnetic layers separated by a ZnS barrier. The hard magnetic bottom electrode consists of an artificial antiferromagnetic structure in which the rigidity is ensured by the antiferromagnetic exchange coupling between two FeCo layers through a Ru spacer layer. The samples were grown by sputtering on Si (111) wafers at room temperature and have the following structure: Fe6 nmCu30 nm(CoFe)1.8 nmRu0.8 nm(CoFe)3 nmZnSx(CoFe)1 nmFe4 nmCu10 nmRu3 nm. The square tunnel elements, with lateral sizes of 10, 20, 50, and 100μm, exhibit typical tunnel resistance of 2–3 kΩ μm2 and nonlinear zero field current–voltage (J–V) variation. The most interesting result is the observation of junction magnetoresistance of about 5% at room temperature with a 2 nm thick ZnS barrier.
Resonant optical reflection by a periodic system of the quantum well excitons at the second quantum state

A periodic multiple quantum well GaAs/AlGaAs structure was designed, grown, and characterized in order to reveal resonant features in optical spectra when the Bragg resonance was tuned to the second quantum state x(e2-hh2) of the heavy-hole exciton-polaritons in the multiple quantum wells. This double resonance was demonstrated by tuning the incident angle of the light as well as by comparison with a single quantum well structure. A significant enhancement of the light-matter interaction was observed, which manifests itself by strong resonant optical reflection and electroreflection.
Effective divisors on moduli spaces of pointed stable curves

This thesis investigates various questions concerning the birational geometry of the moduli spaces Mg and Mg,n, with a focus on the computation of effective divisor classes. In Chapter 2 we define, for any n-tuple d of integers summing up to g − 1, a geometrically meaningful divisor on Mg,n that is essentially the pullback of the theta divisor on a universal Jacobian variety under an Abel-Jacobi map. It is a generalization of various kinds of divisors used in the literature, for example by Logan to show that Mg,n is of general type for all g ≥ 4 as soon as n is big enough. We compute the class of this divisor and show that for certain choices of d it is irreducible and extremal in the effective cone of Mg,n. Chapter 3 deals with a birational model X6 of M6 that is obtained by taking quadric hyperplane sections of the degree 5 del Pezzo surface. We compute the class of the big divisor inducing the birational map M6 99K X6 and use it to derive an upper bound on the moving slope of M6. Furthermore we show that X6 is the final non-trivial space in the log minimal model program for M6. We also give a few results on the unirationality of Weierstras loci on Mg,1, which for g = 6 are related to the del Pezzo construction used to construct the model X6. Finally, Chapter 4 focuses on the case g = 0. Castravet and Tevelev introduced combinatorially defined hypertree divisors on M0,n that for n = 6 generate the effective cone together with boundary divisors. We compute the class of the hypertree divisor on M0,7, which is unique up to permutation of the marked points. We also give a geometric characterization of it that is analogous to the one given by Keel and Vermeire in the n = 6 case.
ASV Station Keeping under Wind Disturbances using Neural Network Simulation Error Minimization Model Predictive Control

Station keeping is an essential maneuver for Autonomous Surface Vehicles (ASVs), mainly when used in confined spaces, to carry out surveys that require the ASV to keep its position or in collaboration with other vehicles where the relative position has an impact over the mission. However, this maneuver can become challenging for classic feedback controllers due to the need for an accurate model of the ASV dynamics and the environmental disturbances. This work proposes a Model Predictive Controller using Neural Network Simulation Error Minimization (NNSEM-MPC) to accurately predict the dynamics of the ASV under wind disturbances. The performance of the proposed scheme under wind disturbances is tested and compared against other controllers in simulation, using the Robotics Operating System (ROS) and the multipurpose simulation environment Gazebo. A set of six tests were conducted by combining two wind speeds (3 m/s and 6 m/s) and three wind directions (0$^\circ$, 90$^\circ$, and 180$^\circ$). The simulation results clearly show the advantage of the NNSEM-MPC over the following methods: backstepping controller, sliding mode controller, simplified dynamics MPC (SD-MPC), neural ordinary differential equation MPC (NODE-MPC), and knowledge-based NODE MPC (KNODE-MPC). The proposed NNSEM-MPC approach performs better than the rest in 4 out of the 6 test conditions, and it is the second best in the 2 remaining test cases, reducing the mean position and heading error by at least 31\% and 46\% respectively across all the test cases. In terms of execution speed, the proposed NNSEM-MPC is at least 36\% faster than the rest of the MPC controllers. The field experiments on two different ASV platforms showed that ASVs can effectively keep the station utilizing the proposed method, with a position error as low as $1.68$ m and a heading error as low as $6.14^{\circ}$ within time windows of at least $150$s.
Face recognition based on singular-value feature vectors

Automatic human face recognition is a difficult but significant problem. A method for face recognition based on singular-value feature vectors is discussed. Three algorithms of face recognition based on singular-value feature vectors are proposed. These algorithms are face recognition using principal component analysis based on singular-value feature vectors, face recognition by Fisher linear discriminant analysis based on singular-value feature vectors, and face recognition using the discriminant Karhunen Loeve (DKL) transform based on singular-value feature vectors. Experimental results show that face recognition based on singular-value feature vectors is effective.
Comparison of Solar Cycle Variations of Solar p-Mode Frequencies from GONG and MDI

The solar p-mode frequencies change with the solar cycle. The horizontal phase velocity dependence of the relative frequency change scaled by mode mass provides depth information on the perturbations in the solar interior. Both GONG data and SOHO MDI data show that the horizontal phase velocity dependence of the scaled relative frequency change varies with solar cycle. Temporal variations of GONG and MDI frequency changes are qualitatively consistent despite some discrepancies. For both GONG and MDI, the smoothed scaled relative frequency change versus horizontal phase velocity is approximately constant at small horizontal phase velocities, but its value decreases for horizontal phase velocities higher than a critical value, as surface activities develop. This critical horizontal phase velocity corresponds to a depth near the base of the convection zone. The magnitude of the decrease in frequency change at large horizontal phase velocities approximately correlates with the sunspot number for both GONG and MDI, although the GONG magnitude is greater than the MDI one. If these signals are real, it suggests that the wave speed in a region near the base of the convection zone changes with the solar cycle. This change might relate to solar cycle variations of magnetic fields near the base of the convection zone.
Measurement of end diastolic shape deformity using bending energy

An approach to analyzing the shape of the end-diastolic contour of the left ventricle of the heart is described. The procedure is adaptable to contour data derived from any one of several imaging modalities. The method involves modeling the contour as a thin flexible rod whose undeformed state is derived from measurements made on a group of normal patients. The amount of effort required to deform any particular contour away from the normal state into its characteristic shape is determined by first finding the local curvature differences between the contour and the mean normal contour at each of 100 normalized points. The weighted square of these differences, summed over all the points or some subset of them, is shown to be the global or regional bending energy of the contour. Resampling, smoothing and curvature-computation issues are considered for contours from contrast ventriculography and equilibrium radionuclide angiocardiography. Initial results show distinct bending-energy signatures for normal and abnormal studies and indicate the complimentary relationship between regional wall motion and regional bending-energy measurements. <<ETX>>
SOME RESULTS ON WEAKLY CONTRACTIVE MAPS

In this paper direct proofs of some common xed point results for two and three mappings under weak contractive condi- tions are given. Some of these results are improved by using dier- ent arguments of control functions. Examples are presented show- ing that some generalizations can not be obtained and also that our results are distinct from the existing ones.
Study on Impact of Equivalent Two Bodies : Coefficients of Restitution of Spheres of Brass, Lead, Glass, Porcelain and Agate, and the Material Properties

Although current equations for coefficient of restitution in the central impact of solid spheres were presented only empirically as a function of the impact velocity v. , theoretical equations for the coefficients of restitution as a function of vi for the impact of spheres of equal diameter and equal material are presented in this study under the assumption that the separation of the impacting spheres is determined at the zero relative displacement. Through comparison of results measured here using two ball pendulums for spheres of brass, lead, glass, porcelain and agate, the viscous nature of the materials is estimated.
The multiple sequence alignment problem in biology

The study and comparison of sequences of characters from a finite alphabet is relevant to various areas of science, notably molecular biology. The measurement of sequence similarity involves the consideration of the different possible sequence alignments in order to find an optimal one for which the “distance” between sequences is minimum. By associating a path in a lattice to each alignment, a geometric insight can be brought into the problem of finding an optimal alignment. This problem can then be solved by applying a dynamic programming algorithm. However, the computational effort grows rapidly with the number N of sequences to be compared $(O(l^N ))$, where l is the mean length of the sequences to be compared). It is proved here that knowledge of the measure of an arbitrarily chosen alignment can be used in combination with information from the pairwise alignments to considerably restrict the size of the region of the lattice in consideration. This reduction implies fewer computations and less memory .
On bases of eigenfunctions of boundary problem associated with small vibrations of damped nonsmooth inhomogeneous string

The initial-boundary problem is considered for a nonsmooth inhomogeneous string with the left end fixed and the right one equipped with a massive ring moving with damping in the direction orthogonal to the length of the string. The asymp- totic behaviour of the eigenvalues of the corresponding boundary problem is investigated. The eigenvectors of the problem are those of a dissipative operator acting in the Hilbert space H = ^ W 1
SIMILARITY SOLUTIONS OF THE MIXED CONVECTION BOUNDARY-LAYER FLOW IN A POROUS MEDIUM

This paper deals with the asymptotic analysis of similarity solutions of the two-dimensional mixed convection boundary-layer flow over a vertical surface with a power law temperature. It is shown that the extended governing equations can be reduced, using a coordinate transform, to the case of the boundary-layer development of large time solutions for the unsteady mixed convection near the stagnation point on a vertical surface in a porous medium. The perturbation solutions for small and large values of the mixed convection parameter are obtained. The asymptotic behavior of the solution was examined for different values of the power law exponent parameter.
Motions of charged particles trapped in the Earth's magnetosphere

Recent measurements by earth satellites provide conclusive evidence that the magnetosphere of the earth is distorted by the solar wind, as has been predicted on theoretical grounds for some time. In the work reported here motions of charged particles trapped in the distorted magnetosphere were computed by using, as a model of the magnetosphere, the field of a weak magnetic dipole in the presence of a strong magnetic dipole. Drift paths through this field were calculated both for particles whose motion is confined to the magnetic equatorial plane and for particles mirroring at low altitudes. The paths of particles of various energies moving in the magnetic equatorial plane under the combined influences of field gradient-induced drift and field rotation were also calculated. It was found that, in the model used, the field rotation energizes trapped particles on the morning side and de-energizes them on the evening side of the earth. It is suggested that this effect must occur in any realistic model of the distorted magnetosphere and that it may play a role in the accumulation of the energetic particles that constitute the Van Allen zones.
FATE (FY2014) proposal. Development of a fishery-independent time series of rockfish ( Sebastes spp.) abundances under varying environmental and management conditions to improve stock and ecosystem assessments

Rockfishes (Sebastes spp.) are important components of the West Coast commercial and recreational fisheries [1] as well as the coastal marine and terrestrial ecosystems [2]. Over the past half century fishing pressure, coupled with varying oceanographic conditions, led to dramatic declines in catch per unit effort of many of the larger species such as cowcod [3], bocaccio [4,5], and blackgill rockfishes [6]. Stock assessments formalized the collapse of several populations which led to the establishment of multiple rockfish conservation areas (RCAs) along the west coast of the United States. Although many of these RCAs have now been in place for more than a decade there is little information on rockfish population trends, thus hindering the capacity of stock and ecosystem assessments to characterize rockfish and ecosystem status and our ability to evaluate reserve efficacy. Our proposal seeks to develop and incorporate into stock assessments and Integrated Ecosystem Assessments (IEA) a new fisheryindependent data set on rockfish dynamics in southern California and test the influence of RCAs and oceanographic conditions on stock and ecosystem status.
Properties of the planar poly(3‐octylthiophene)/aluminum Schottky barrier diode

Formation and characterization of planar polymer Schottky barrier diodes are presented. Electrical characteristics of planar aluminium‐poly(3‐octylthiophene) Schottky barrier diodes are studied with emphasis on the current transport mechanisms. The device exhibits nearly ideal diode behavior in dark with an ideality factor of n=1.2. Temperature dependence of the current‐voltage characteristics of the diode is studied in the range 170–370 K. Agreement with the diffusion theory of metal‐semiconductor rectification is demonstrated for high temperatures T≳300 K. For temperatures less than room temperatures tunneling is proposed to be the dominant current transport mechanism.
The scaling of relativistic double-layer widths: Poisson--Vlasov solutions and particle-in-cell simulations

In this paper the study of relativistic plasma double layers is described through the solution of the one‐dimensional, unmagnetized, steady‐state Poisson–Vlasov equations and by means of one‐dimensional, unmagnetized, particle‐in‐cell simulations. The thickness versus potential‐drop scaling law is extended to relativistic potential drops and relativistic plasma temperatures. The transition in the scaling law for ‘‘strong’’ double layers suggested by analytical two‐beam models by Carlqvist [Astrophys. Space Sci. 87, 21 (1982)] is confirmed, and causality problems of standard double‐layer simulation techniques applied to relativistic plasma systems are discussed.