Miracle-dz/UniFAR-FTUs huggingface dataset:
Carbon sp3 hybridization bonds in composites “polymer – CNT”

The possibilities to enhance the properties of nanostructured surfaces have been demonstrated on “polymermultiwall carbon nanotubes” composites. Carbon nanotubes are among the most anisotropic materials known and have extremely high values of the Young modulus. Influence of sp hybridization bonds on polymer crystallization and strengthening was investigated in composite films of polyethyleneimine, polyamide and polypropylene with multiwall carbon nanotubes. IR absorption maxima were measured after formation of composite “polyethyleneimine-carbon nanotubes” in the area of the sp hybridization bonds at the frequency of primary amino groups of polyethyleneimine. High IR absorption at frequencies of sp hybridization bonds of polypropylene, polyamide-6 with carbon nanotubes is determined by γω(CН) and γω(CH2) vibrations as a result of the formation of C-C bonds in the polymer chains, which increases the crystallization of polymers and the strength of the composites. The IR absorption peak dependences on the carbon nanotube content at frequencies of sp hybridization bonds are described by a 1D Gaussian curve for the diffusion equation in the electric field. Thus, the way to improve the strength properties of “polymer-CNTs” composites is the polymer crystallization as a result of the transformation of the C-C bonds in the polymer chains supported by the resonances of the primary amino groups, γω(CH) and γω(CH2) in the electric field between the nanotubes and polymer matrix. Tensile strength for polyamide-6 composites at 0.25 % CNT increases 1.7 times and tensile deformation – 2.3 times.
Using Privacy Enhancing and Fine-Grained Access Controlled eKYC to implement Privacy Aware eSign

eSign is an online electronic signature service which is recently gaining more prominence in India. eSign is based on two online services from UIDAI, viz. a viz., Aadhaar based authentication and retrieval of resident’s eKYC information after taking his / her consent. With increased adoption of Aadhaar based services, privacy of user data has become more and more important. Present method of taking boolean consent from resident through non-UIDAI entity may not be acceptable for two main reasons, ﬁrst is that the consent does not include in itself a proof from resident that the consent is indeed taken from him / her and second is that the resident may wish to have better privacy and ﬁne grained access control rules to access his / her eKYC data. Bakshi et.el have introduced a mechanism to improve amortized performance of eSign using a digital access token. In this work, the digital access token is enhanced to include Privacy Enhancing and Fine-Grained Access Control (PEaFGAC) Statements for facilitating Privacy Aware eSign. These tokens can be used by other entities to access eKYC data of the resident with better access controls enforced by the resident. This paper brieﬂy describes the present model of eSign, the earlier proposed model of eSign followed by the proposed model of Privacy Aware eSign. The proposed model of Privacy Aware eSign is also analyzed using BAN logic assuming Dolev-Yao security environment.
Role of ZnO as a Transparent Layer in Thin Film Solar Cells Using Spray Pyrolysis Technique

A versatile and cost effective spray pyrolysis technique was used to prepare the Zinc Oxide (ZnO) thin film on a glass substrate. The feature of the obtained film was characterized using Glancing incidence angle X-ray diffraction (GIXRD), Scanning Electron Microscope (SEM), UV-Visible Spectroscopy and Photoluminescence (PL). GIXRD confirmed that the structure of the ZnO film was polycrystalline having wurtzite structure. SEM image revealed root-like morphology on the surface of ZnO thin film and the shortest root diameter was about 91.2 nm. From UV-Visible spectrum an optical transmittance of about 85% in the visible region and direct optical band gap energy of 3.2 eV was calculated. The PL analysis showed that the film exhibited a strong emission peaks at violet and green region. From the characterized results, spray pyrolysis is the viable technique to deposit ZnO thin film on a glass substrate, which can be used as a transparent layer in thin film solar cells.
ADHD Rating Scale-IV en una muestra escolar española: datos normativos y consistencia interna para maestros, padres y madres

Introduccion. Las ADHD Rating Scale -IV (ADHD RS-IV) son unas de las escalas mas utilizadas en evaluacion del trastorno por deficit de atencion/hiperactividad (TDAH), al presentar puntos de corte por edad, genero y ambiente; sin embargo, estan normalizadas en poblacion estadounidense. Objetivo. Realizar la normalizacion de las ADHD RS-IV para maestros y padres en una muestra espanola. Sujetos y metodos. Se utilizan las escalas ADHS RS-IV de maestros y padres de un estudio epidemiologico de prevalencia del TDAH en escolares de 6-12 anos y se analizan las diferencias a traves de un diseno intrasujetos entre los tres evaluadores (maestros, padres y madres) y en cada una de las tres subescalas (IN, H/I y TOT), en funcion de los factores genero y edad. Mediante un diseno intersujetos, se analizan las diferencias que se dan en cada evaluador en las tres subescalas en funcion de los factores ? genero y edad? Por ultimo, se analiza la fiabilidad por consistencia interna de cada subescala y para cada evaluador. Resultados. No existe diferencia significativa entre padres y madres, pero si entre maestros frente a padres y/o madres. En el factor genero, se considera a los ninos mas inatentos y mas hiperactivos/impulsivos que las ninas. Los resultados han seguido una tendencia a la inversa a la muestra estadounidense, ya que en nuestro caso los padres han puntuado de modo significativamente superior con respecto a los maestros. Conclusion. El uso y la normalizacion de las ADHD RS-IV requiere no solo contemplar aspectos de edad, genero o tipo de evaluador, sino tambien aspectos socioculturales
Geometrical Evaluation of a Pair of Elliptical Tubes Subjected to a Flow with Forced Convection Heat Transfer

In the present work it is performed a study on the geometric evaluation of a pair of elliptical tubes subjected to external flow with forced convection by means of numerical approach. The objectives are the maximization of Nusselt number (NuD) and the minimization of drag coefficient (CD). The degrees of freedom for the pair of tubes arrangement are: the ratio between the transverse pitch and characteristic length of tubes (ST/D), where D = (A)1/2, the ratio of the main and secondary axes of the elliptical tube (a/b) and the angle of incidence of the flow on the pair of tubes (α). The simulations were carried out considering two-dimensional forced convective flows, in the laminar regime and incompressible conditions. For all configurations, Reynolds and Prandtl numbers are constant, ReD = 100 and Pr = 0.71. The Finite Volume Method (FVM) is used to solve conservation equations of mass, momentum and energy. The software Gmsh is used for creation of the geometries and generation of the meshes. Results showed that the degrees of freedom affected the fluid dynamic and thermal performance of the forced convective flow. According to the objectives outlined in this study, the best performance for the maximization of heat transfer was obtained when α = 0o, a/b = 1⁄2 and ST/D = 3.5. In the case of the fluid dynamics study, the optimal result for CD minimization occurred when α = 0o, a/b = 2.0 and ST/D = 4.0. Thus, the optimal geometry will depend on the indicator performance where the problem is evaluated.
Microstructure and strength of sintered magnesium containing low-melting-point metal powders

Generally, magnesium powder is sintered by a large plastic deformation and surface oxide destruction is caused during the hot extrusion process. However, in this study, the binary mixtures of a low-melting-point metal powder (Sn, Bi, Sb) and the pure magnesium powder with surface oxide were sintered by transient liquid phase (TLP) under vacuum of about 3 Pa after they were degassed during heating. The size of the intermetallic compound formed at the old powder particle boundary and grain boundary influenced the strength characteristics of the sintered mixtures. As a result, the transverse rupture strength and bending strain of Mg–Sn type sintered compacts were superior to those of as-cast AZ91. This sintering technique without extrusion, the traditional liquid phase sintering, leaves room for improving strength characteristics by controlling the size of an intermetallic compound. (Received February 3, 2015 Accepted April 10, 2015)
Effectiveness of two field methods of saturating near surface concrete on the water permeability of in situ concrete

Determining the water permeability of concrete in structures remains a challenge because of difficulties in removing the influence of its moisture content. Saturating concrete with water could be one option, but this is not easy to achieve on site. This paper reports a testing programme carried out to assess the reliability and effectiveness of two field saturation methods, viz. vacuum saturation and ponding. The water permeability test results after applying the vacuum saturation and ponding were compared with that obtained after incremental immersion. It was found that ponding was unable to remove the influence of moisture, whilst vacuum saturation was effective for wet concretes. The results obtained from the electrical resistance measurements after incremental immersion suggested that the water permeability of concretes can be accurately determined by carrying out in situ permeability tests if the near surface region up to a depth of 25 mm is fully saturated.
Experimental determination of length changes of autoclaved aerated concrete during the freeze-thaw cycle

The aim of the paper is an experimental determination of the longitudinal expansion of autoclaved aerated concrete (AAC) during the freeze-thaw cycle. Longitudinal changes were measured with lasers and the surface temperature was measured using an infrared temperature gauge. The temperature distribution over the sample was verified by a numerical calculation.
Development of piezoelectric PVDF sensor integrated textile yarn

Since the invention of micro-electromechanical systems (MEMSs), scientists have found it possible to introduce novel functional textiles and garments that are very close in appearance to conventional textile products. In addition to this, wireless communication technology will enable a flow of information between devices, human body and the external environment. In the last decade, the micro system technologies have focused on flexibility apart from the size. The large area available in these products provides the space to integrate micro systems and still offer enough flexibility in the fabrics to make them wearable as well. Piezoelectric material is a smart and flexible material capable of generating electrical polarisation under applied mechanical stress. Therefore piezoelectric PVDF films are such material candidates using which smart textiles can be created and can be shaped easily into many wearable electronic products or forms. The purpose of this study is to encapsulate piezoelectric PVDF material in/onto a textile yarn in order to create intelligent yarns. The encapsulation of piezoelectric material in/onto yarn would enable them to be placed, using conventional textile manufacturing processes, in textiles in order to measure mechanical stimulations on them. The piezofilm sensor size was cut to 1 x 10mm to bring it close to textile yarn dimensions. A soft encapsulation material was utilised in order to create an encapsulation area as soft as yarn also providing washability and tumble drying. In order to transport the data generated by these PVDF sensing yarns, carbon loaded monofilament yarns, in the form of conductive pathways in the fabrics, were attached to the piezofilm by creating a conductive and strong bond. Manufactured Piezofilm Yarn Sensors (PYSs) were characterised by conducting tensile, pressure, buckling, long term cyclic and breakage tests, showing good voltage generation and linearity. The PYS samples were knitted along with textile yarns for the creation of smart structures. Human body experiments showed that the knitted PYSs are able to measure both respiration and heart beat signals at static or ambulatory conditions. Therefore the newly created PYS could play an important role towards the advancement of wearable health monitoring systems.
An Fe2O3 nanoparticle-reduced graphene oxide composite for ambient electrocatalytic N2 reduction to NH3

Fe2O3-rGO behaves as an Earth-abundant NRR electrocatalyst for conversion of N2 to NH3 in 0.5 M LiClO4, achieving a large NH3 yield of 22.13 μg h−1 mg−1cat and a high faradaic efficiency of 5.89%.
Dielectric ring based metamaterial perfect reflector

In this work a novel design of an all-dielectric metamaterial perfect reflector has been proposed which exhibits 100% reflectance at a particular frequency and high reflectance in a broad range of wavelengths. This design is purely dielectric, hence, is free from resistive losses which are intrinsic to metallic thin film type reflectors. The design is compatible to on-chip fabrication techniques and can be realised by using well known methods such as optical lithography or electron beam lithography. The proposed structure can augment the performance of low loss cavity resonators, frequency selective filters, sensing, directive emission of radiation, etc.
Can sympathetic modulation of arterial smooth muscle produce the "10-second rhythm"? Analysis with a computer model of blood pressure control

A computer model of cardiovascular control based on experimentally derived response characteristics of cardiovascular control components was used to study the 10-second oscillations in arterial pressure and heart rate commonly observed in humans and other animals. Evidence exist to support many theories for the oscillations most of which rely on the ability of muscle sympathetic nerve efferent activity to modulate arterial pressure at frequencies up to 0.12 Hz. However, experimental evidence suggests that sympathetic vascular control has very low gain (-13 to -34 dB) at 0.10 Hz, and a review of previously published computer models reveals that the filter properties used to produce a 10-second rhythm differ from the experimental results. Results of model simulations demonstrate that without modification of the efferent responses derived from the experimental data, no spontaneous oscillations are present.
Rural Infusion through Case Method Instruction

This paper proposes the case method as a technique for infusing elements of rural special education into preservice programs. It offers ways in which ruralness can be emphasized through case selection, modification, or development. Case method instruction permits the instructor to developmentally infuse previously learned competencies to current problem oriented issues in the real world of teaching from a holistic framework rather than in isolation. It can be used simultaneously with other methods to extend students' content knowledge and processing skills. Finally, suggestions are offered to evaluate the attainment of student competencies in content and processes and broaden the understanding of rural special education service delivery.
Dual-Stage Construction of Probability for Hyperspectral Image Classification

Recently, feature extraction-based methods have received increasing attention in the hyperspectral image. In this letter, to ensure a more powerful discriminative ability of extracted features, a dual-stage construction of probability (DSCP) method is proposed for hyperspectral image classification. Specifically, the extended multi-attribute profiles (EMAP) method is applied to extract the shape feature of hyperspectral remote sensing image (HSI) to obtain a more accurate initial probability map. Considering that there are still some noises in the boundaries of the initial probability map, an effective edge-preserving filter-based approach named rolling guidance filter is used for probability post-optimization. Consequently, the class label of each pixel can be determined according to the optimized probability maps. Experiments demonstrate significantly the efficiency of the proposed method in comparison with other advanced methods.
Characteristics of optical chaos generated by an acousto-optic system in the Raman-Nath mode

Chaotic optical signals may be generated by using an acousto-optic system in the Raman-Nath mode. The bistability in the Raman-Nath mode is realized by detecting the intensity of the diffracted optical beams and feeding back the electronic signal to drive the acousto-optic cell. If the parameters of the system are chosen ”judiciously”, the intensity of the output beams oscillates in a chaotic manner in time. The conditions for generating chaos from various diffraction orders of the Raman-Nath cell are derived by calculating the Lyapunov exponents. If the Lyapunov exponent is a positive number then the system generates chaos; otherwise the system remains stable and produces a well-defined output signal. When the Lyapunov exponent for a RamanNath diffraction order is known the physical parameters are calculated so that chaos is produced in the output of the system in that diffraction order.
Perspectives in Infant Mental Health

The World Association for Infant Mental Health (WAIMH) decided to compose a position paper on infants’ rights in wartime, as there is still a general lack of attention paid to the impact of war-related traumas on infants’ development and psychological health. Though there are numerous areas of violent conflicts around the globe, there have been few published studies that relate specifically to infants. Consequently, humanitarian aid programs tend to overlook infants’ psychological needs and to pay more attention to those of older children. This position paper first reviews the studies identified through a literature search, about the impact of warrelated traumas during pregnancy and postnatal periods, then describes the existing recommendations that have been added to the Children Rights Convention and their implications for infant mental health clinicians” (Keren, Abdallah & Tyano, 2019). Here is the open-source link to: WAIMH Position paper: Infants rights in wartime. https://onlinelibrary.wiley. com/doi/ full/10.1002/imhj.21813
Numerical method for calculating electromagnetic fields in three dimensions

A network method is presented for the numerical solution of general three-dimensional electromagnetic field problems. Two physically separate circuit models are derived to represent the electric and magnetic parts of the field. Linkage between the two parts of the network model is through mesh variables. Conventional network techniques are used to define a minimum independent set of mesh variables, for which, the linked network is solved. The solution of the simultaneous equations from the network field model, by a preconditioned conjugate gradient algorithm, is described. The main problems that have been found to occur in the use of this algorithm are demonstrated. It is shown how these problems are related to the form of the network model used. Recommendations are made as to how the preconditioned conjugate gradient algorithm can be used most efficiently for the solution of the linked network mesh field equations. The validity and accuracy of the linked network method, for solution of the general three-dimensional electromagnetic field, is demonstrated by a comprehensive comparison of calculated and experi­ mental results for power frequency eddy current problems. Good agreement is shown to be obtained between calculation and experiment. A form of the full three-dimensional linked network model is developed for problems that are periodic along one cartesian co­ ordinate direction (quasi-3D}. The validity of this model is confirmed by a comparison of flux density, thrust and normal force calculations with experiment for an axial flux linear motor. Where applicable,
Improving the modified XFEM for optimal high‐order approximation

This paper investigates the accuracy of high‐order extended finite element methods (XFEMs) for the solution of discontinuous problems with both straight and curved weak discontinuities in two dimensions. The modified XFEM, a specific form of the stable generalised finite element method, is found to offer advantages in cost and complexity over other approaches, but suffers from suboptimal rates of convergence due to spurious higher‐order contributions to the approximation space. An improved modified XFEM is presented, with basis functions “corrected” by projecting out higher‐order contributions that cannot be represented by the standard finite element basis. The resulting corrections are independent of the equations being solved and need be pre‐computed only once for geometric elements of a given order. An accurate numerical integration scheme that correctly integrates functions with curved discontinuities is also presented. Optimal rates of convergence are then recovered for Poisson problems with both straight and quadratically curved discontinuities for approximations up to order p ≤ 4. These are the first truly optimal convergence results achieved using the XFEM for a curved weak discontinuity and are also the first optimally convergent results achieved using the modified XFEM for any problem with approximations of order p>1. Almost optimal rates of convergence are recovered for an elastic problem with a circular weak discontinuity for approximations up to order p ≤ 4.
A Markov Chain-Based Secrecy Outage Probability Analysis of a Full-Duplex Relay Network

Physical layer security is studied for a wireless full duplex relay network, where relay selection scheme is adopted to enhance security performance. More specifically, considering the effect of inter-relay interference and residual self-interference, a Markov matrix is utilized to model the state transition probability for the number of successful decoding relays. Based on outdated channel state information between the relays and the legitimate destination, the secrecy outage probability under Rayleigh fading is investigated and its analytical expression is derived. The derived theoretical results are validated by computer simulations. The results reveal that our analytical results using Markov chain match the simulations, while the analytical method based only on probability theory cannot accurately predict the secrecy outage performance.
DNA graph characterization for line digraph of dicycle with one chord

Characterization of DNA graph gives important contribution in completing the computational step of Sequencing by Hybridization (SBH). Some graphs are already characterized as DNA graph using (α, k)-labeling. Dicycle and dipath are DNA graphs, while rooted trees and self adjoint digraphs are DNA graphs if and only if their maximum degree is not greater than four. In this paper we also use (α, k)-labeling to characterize line digraph of dicycle with one chord C n as DNA graph and show that for m, n ∈ N, t = ⌊ n 2 ⌋ , L(C n) are DNA graphs.
Leading students towards the formal world of mathematical thinking: a mathematician’s reflections on teaching eigentheory

ABSTRACT In this study, we analysed a mathematician’s teaching journals on eigenvalues and eigenvectors in a first-year linear algebra course. The research team employed Tall’s [How humans learn to think mathematically: Exploring the three worlds of mathematics. Cambridge University Press] three-world model of embodied, symbolic and formal as a framework for understanding the mathematician and teacher’s pedagogical reflections as he led the class to the formal world. In order to reach the formal world, he used a sequence of tasks that emphasized embodied and symbolic, as well as formal thinking. The analysis of the journals showed that the mathematician faced challenges in leading the class towards the formal world. The study also revealed that the mathematician strived to build a concept image, that, while perhaps mirroring his own, did not resonate with the students.