Miracle-dz/UniFAR-FTUs huggingface dataset:
The Quadruple Wolf-Rayet System GP Cephei: Spectral Types, Masses, Mass-Loss Rate, and Colliding Winds

We have reevaluated the orbital elements for each pair of the quadruple (W-R+O) + (O+O) stellar system GP Cep and propose new spectral types WN6o/WCE + O3-6, B0: I + B1: V-III. It is shown that there is only one Wolf-Rayet (W-R) star in GP Cep, contrary to a previous claim. A rate of change = 1.3 ± 0.2 s yr-1 is determined for the W-R+O pair, which leads to a new period of 6.6887 days and to a W-R mass-loss rate of (0.8-3.0) × 10-5 M☉ yr-1. Masses for this pair are estimated to be MW-R ≳ 6 M☉ and MO ≳ 21 M☉. The effects of wind-wind collision in the W-R+O pair are studied. It is shown that even after allowing for dilution by the OB components of the quadruple system, these effects are not as strong as in the binary V444 Cygni (WN5+O6, P = 4.212 days). In GP Cep, the phase-dependent, relatively weak excess emission does not originate in the arms of the bow shock cone. Rather, it emerges from the extra heated portion of the W-R wind facing the hot O companion. The trailing bow shock arm is clearly seen, however, as an enhanced He I absorption component near quadrature at phase ~0.73. An anomalous blueshifted He I absorption is present at phase ~0.9, as is also seen in V444 Cyg, in the WC8+O9 I/O8 III binary γ Velorum and in the LBV-cotype binary R81 (B2.5 Iab:e). A 3.5 day orbit for the eclipsing B star pair is confirmed.
Stimulated Emission and Laser Action in Gallium Nitride

Stimulated emission and laser action have been observed near 3.45 eV in single‐crystal needles of GaN. These observations support the earlier suggestion that GaN is a direct band‐gap semiconductor with Eg∼3.50 eV at 2°K. Furthermore, the occurrence of very high gain (g∼105 cm−1) in the stimulated emission emphasizes the possible device potential of this material.
Coupled-Mode Analysis of a Gating-Assisted Directional Coupler Using Singular Perturbation Technique - Abstract *

An accurate coupled-mode analysis of a grating-assisted directional coupler is presented using the singular perturbation technique. The optical fields in the coupler are represented by a linear combination of para-axial wave fields for each isolated waveguide. The para-axial wave fields are expanded using the multiple space-scales and solved so that they satisfy the para-axial wave equation for the coupled structure in the respective order of perturbation. This leads to the nonorthogonal coupled-mode equations which are accurate in the second order of perturbation. The proposed coupled-mode theory is applied to the analysis of two nonidentical coupled waveguides attached with a sinusoidal grating layer. The calculated wavelength response in the power transfer shows a close agreement with that obtained by a direct numerical analysis using the Fourier series expansion method.
Head-Mounted Displays for Virtual Environments: The Optical Interface

Head-mounted display (HMD) systems are becoming more and more popular tools Tor scientific visualization across many disciplines. This paper focuses on the optical interface to virtual worlds. Three generic types of optical viewers are described, as well as a head-tracking optical device with scalable work area. Current state of the art is discussed, and the HMD of the future presented.
A Load Adaptive Digital Gate Driver IC With Integrated 500 ksps ADC for Drive Pattern Selection and Functional Safety Targeting Dependable SiC Application

A fully integrated load adaptive digital gate driver is proposed for high-speed and dependable SiC applications. It breaks the trade-off between surge/ringing and switching loss over a wide load range of 3–15 A by selecting the gate patterns stored in 8 channel 1.5 kb look up table (LUT). The principle of voltage ringing during turn-off of power devices is analyzed, and a method of temporarily controlling the gate current in the opposite direction is found to be effective. A proposed time resolution expansion technique allows the output of optimal waveforms based on theory without increasing the memory size, achieves the surge/ringing suppression of 51% and reduce the LUT size by 1/12. The integrated 500 ksps successive approximation register analog to digital converter (ADC) with steady sampling and automatic power supply voltage (VDD) selection schemes senses not only the load current, but also the surge and the short circuit for functional safety.
Elastic field in a semi-infinite solid due to thermal expansion or a coherently misfitting inclusion

It is shown that the elastic field due to non-uniform temperature or a coherently misfitting inclusion in a semi-infinite region can be derived simply from the corresponding field in an infinite region. This follows from the work of Mindlin and Cheng [J. Appl. Phys. 21, 931 (1950)] but it is not necessary to calculate the thermoelastic potential itself. In particular, the displacement of the free surface is the same as that of the equivalent plane in an infinite solid, increased by a factor of 4 (1 − ν). The change in volume associated with the distortion of the surface is reduced by a factor of 2 (1 + ν) from the free expansion of the inclusion. A rectangular inclusion is used to illustrate the theory.
When Controlling Persons Have Shelters: The Effect of Foreign Residency Rights on Tax Credit Ratings

ABSTRACT This paper examines the influence of controlling persons’ foreign residency rights on corporate tax credit ratings (TCRs). The empirical results show that corporate TCRs decrease when the controlling person obtains foreign residency rights. The mechanism analysis indicates that there are three main channels, i.e. more tax avoidance behaviors, more earnings management and a higher frequency of violations. Our findings demonstrate that the controlling person’s foreign residency rights are an indicator worthy of supervisors’ attention. Tax authorities could strengthen the inspection of foreign-related tax activities.
Theoretical and experimental approach of the propagation of high frequency waves in road tunnels

Characterization of high frequency electromagnetic wave propagation in tunnels has important applications in the field of mobile communication. In long tunnels, the amplitude of the electric field radiated by a retransmitting antenna can be easily calculated from ray theory. However, for short tunnels, one of the most critical points is either the radiation towards free space of a mobile station emitting in the tunnel or, on the contrary, the penetration of an external wave inside the tunnel. This coupling between the inside and the outside is treated through the uniform theory of diffraction. By comparing theoretical and experimental results, it is shown that this theory leads to adequate prediction of the field variation and allows the authors to point out the influence of parameters, such as the position of the mobile in the tunnel and the influence of the angle of incidence, on the entrance plane of an incoming external wave. >
Single-Layer Dual-Circularly Polarized Series-Fed Gap Waveguide-Based Slot Array for a 77 GHz Automotive Radar

A series-fed single-layer dual-circularly polarized slot array antenna fed by a stepped ridge gap waveguide (RGW) is proposed at the 77-GHz band. The antenna generates dual-circularly polarized waves, which shows potential to be used in next-generation polarimetric radar for automotive applications. The antenna contains eight columns of linear arrays and two feeding ports for exciting the columns of the slots. The design process and measured results are described in this article. The measured results show that the realized gain of the proposed antenna is above 27.3 dBi and the axial ratio is about 2 dB over the proposed 76–79 GHz with dual-CP patterns. The measured <inline-formula> <tex-math notation="LaTeX">$S_{11}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$S_{22}$ </tex-math></inline-formula> for the proposed antenna is below −10 dB and the measured port isolation is above 17.5 dB.
Gamma-Ray Burst Jets and their Radio Observations

Abstract Radio observations play a key role in studying the jets that power GRBs, the most luminous cosmic explosions. They are crucial for determining the GRB jet energy, the external density, and the microphysical parameters of relativistic collisionless shocks, from afterglow broadband modeling. Radio image size measurements are rare, but provide extremely useful information. The “radio flare” peaking after ~1 day helps constrain the magnetisation and magnetic-field structure of GRB outflows. This review discusses the current observational and modeling status, focusing on the afterglow and outlining prompt radio emission searches, along with recent theoretical progress in GRB jet dynamics, focusing on magnetic acceleration, jet propagation inside a massive star progenitor (for long GRBs), the reverse shock, and the late afterglow. Great progress has been made in our understanding of magnetic acceleration, collimation and later sideways expansion of GRB jets, with interesting implications for the prompt, reverse shock, and afterglow emission. We outline how theory and observations were combined to study GRB jet physics and their immediate environment. Finally, potential paths are suggested for combining theory and observations to achieve greater progress, and some prospects for the future are discussed in light of the expected improvements in observational capabilities and theoretical advances.
Efficiency Evaluation of PMASynRM versus SynRM Using a Coupled Finite Element Method and Preisach Modeling

This paper deals with the efficiency evaluations in a synchronous reluctance motor (SynRM) versus a permanent magnet assisted SynRM (PMASynRM), using a coupled transient finite element method (FEM) and Preisach modeling, which is presented to analyze the characteristics under the effects of saturation and hysteresis loss. We herein focus on the efficiency evaluation relative to hysteresis loss and copper loss on the basis of load conditions in a SynRM and PMASynRM. Computer simulation and experimental results for the efficiency, using a dynamometer, show the propriety of the proposed method and the high performance of the PMASynRM.
Time variability of gamma Cassiopeiae in X-rays

Observations par le satellite EXOSAT, de la source RX 4U 0053+60 (γ Cas), revelant des oscillations dans le flux RX avec une periode d'environ 6000 t. La source montre egalement une variabilite chaotique sur des echelles de temps pouvant aller jusqu'a quelques dizaines de secondes. Ces observations sous-tendent l'hypothese que la source RX est une etoile a neutrons dans une large orbite autour de l'etoile Be γ Cas
A NEW METHOD FOR THE SYNTHESIS OF NON- UNIFORM LINEAR ARRAYS WITH SHAPED POWER PATTERNS

Antenna arrays with shaped power patterns have many applications in communications and radars. Many antenna array synthesis techniques for shaped patterns have been developed in the past years, and most of them deal only with uniformly spaced arrays. In this paper, a new method is proposed for the synthesis of nonuniform linear antenna arrays with shaped power patterns. The proposed synthesis method consists of three steps. First, we flnd a satisfactory power pattern for the required radiation characteristics by solving a constrained least-squares problem which is obtained with the help of non-redundant representation of squared magnitude of a linear array factor. Then, we factorize the polynomial associated with the power pattern by using polynomial rooting, and consequently obtain the corresponding fleld patterns. Finally, the forward-backward matrix pencil method is used to obtain a nonuniform linear array with optimized excitation magnitudes, phases and locations for a speciflc choice of fleld patterns. The synthesized array has a smaller number of elements than the one with uniformly spaced elements for the same
High-frequency scattering by objects buried in lossy media

The uniform geometrical theory of diffraction (UTD) is extended so that it can be used to calculate the scattering from an object buried in a lossy medium. First, the accuracy of this high frequency method is examined by comparing numerical results for the scattering by a polygonal cylinder in a lossy medium of infinite extent with calculations based on a method of moments (MoM) solution. Next, the more difficult scattering problem of a polygonal cylinder in a lossy half space is treated. The UTD solution for the unbounded region is employed together with the fields of rays introduced by the interface between air and the lossy medium to obtain expressions for the scattered field in air and in the lossy medium.
The Space Charge Effect on the Corona Discharge of SF Gas Seung-Kil Choi, Duk-Yong Ha, Heung-Jin Ju, Jae-Hak Shim, Cheon Lee, and Hyung-Boo Kang

In this paper, the characteristics of corona discharge in SF gas used as an insulating medium in lots of high-voltage equipments, are simulated by using the finite-element method (FEM) with the flux-corrected transport (FCT) method. The properties of negative corona discharge in needle to plane elec- trode are analyzed at different discharge stages. For the accurate results, the secondary electron emission by photon and ion as well as Townsend first ionization and electron attachment are considered. The simulation results show that the electric field intensity between anode and ion group decreases according to the electric field distortion by space charge as time goes by. It is also found that the electron density is reduced sharply by the superior electron attachment effect of SF gas so that the corona discharge has been extinguished abruptly. Index Terms—Corona discharge, finite element method (FEM), flux-corrected transport (FCT) method, SF gas.
Development and validation of the Attribution of Mental States Questionnaire (AMS-Q): A reference tool for assessing anthropomorphism

Attributing mental states to others, such as feelings, beliefs, goals, desires, and attitudes, is an important interpersonal ability, necessary for adaptive relationships, which underlies the ability to mentalize. To evaluate the attribution of mental and sensory states, a new 23-item measure, the Attribution of Mental States Questionnaire (AMS-Q), has been developed. The present study aimed to investigate the dimensionality of the AMS-Q and its psychometric proprieties in two studies. Study 1 focused on the development of the questionnaire and its factorial structure in a sample of Italian adults (N = 378). Study 2 aimed to confirm the findings in a new sample (N = 271). Besides the AMS-Q, Study 2 included assessments of Theory of Mind (ToM), mentalization, and alexithymia. A Principal Components Analysis (PCA) and a Parallel Analysis (PA) of the data from Study 1 yielded three factors assessing mental states with positive or neutral valence (AMS-NP), mental states with negative valence (AMS-N), and sensory states (AMS-S). These showed satisfactory reliability indexes. AMS-Q’s whole-scale internal consistency was excellent. Multigroup Confirmatory Factor Analysis (CFA) further confirmed the three-factor structure. The AMS-Q subscales also showed a consistent pattern of correlation with associated constructs in the theoretically predicted ways, relating positively to ToM and mentalization and negatively to alexithymia. Thus, the questionnaire is considered suitable to be easily administered and sensitive for assessing the attribution of mental and sensory states to humans. The AMS-Q can also be administered with stimuli of nonhuman agents (e.g., animals, inanimate things, and even God); this allows the level of mental anthropomorphization of other agents to be assessed using the human as a term of comparison, providing important hints in the perception of nonhuman entities as more or less mentalistic compared to human beings, and identifying what factors are required for the attribution of human mental traits to nonhuman agents, further helping to delineate the perception of others’ minds.
A Review on the Security of IoT Networks: From Network Layer’s Perspective

Internet of Things (IoT) has revolutionized the world in the last decade. Today millions of devices are connected to each other utilizing IoT technology in one way or the other. With the significant growth in IoT devices, the provision of IoT security is imperative. Routing protocol for low power and lossy networks (RPL) is a network layer protocol, specially designed for routing in IoT devices. RPL protocol faces many attacks such as selective forwarding attacks, blackhole attacks, sybil attacks, wormhole attacks, and sinkhole attacks. All these attacks pose great threats to IoT networks and can substantially affect the performance of the network. In this work, a comprehensive review of internal attacks on the network layer is presented. Specifically, we focus on the literature that considers presenting solutions for the detection and prevention of sinkhole attacks. We reviewed the state-of-the-art works and different performance parameters like energy consumption, scalability, threshold value, packet delivery ratio, and throughput. Moreover, we also present a detailed analysis of machine learning-based algorithms and techniques proposed for the security of RPL protocol against internal attacks.
Partitioned iterative solution methods for fluid–structure interaction

The basic subiteration method for fluid-structure interaction (FSI) problems is based on a partitioning of the fluid-structure system into a fluidic part and a structural part. The effect of the fluid on the structure can be represented by an added mass to the structural operator. This added mass can be identified as an upper bound on the norm or spectral radius of the Poincare-Steklov operator of the fluid. The convergence behavior of the subiteration method depends sensitively on the ratio of the added mass to the actual structural mass. For FSI problems with large added-mass effects, the subiteration method is either unstable or its convergence behavior is prohibitively inefficient. In recent years, several more advanced partitioned iterative solution methods have been proposed for this class of problems, which use subiteration as a component. The rudimentary characterization of the Poincare-Steklov operator provided by the added mass is, however, inadequate to analyze these methods. Moreover, this characterization is inappropriate for compressible flows. In this paper, we investigate the fine properties of the Poincare-Steklov operators and of the corresponding subiteration operators for incompressible- and compressible flow models and for two distinct structural operators. Based on the characteristic properties of the subiteration operators, we subsequently examine the convergence behavior of several partitioned iterative solution methods for FSI, viz. subiteration, subiteration in conjunction with underrelaxation, the modified-mass method, Aitken's method, and interface-GMRES and interface-Newton-Krylov methods.
Spondyloocular Syndrome: A Report of an Additional Family and Phenotypic Spectrum Delineation

Spondyloocular syndrome (SOS, OMIM # 605822) is a rare genetic disorder characterized by osseous and ocular manifestations, including generalized osteoporosis, multiple long bones fractures, platyspondyly, dense cataracts and retinal detachment, and dysmorphic facial features, with or without short stature, cardiopathy, hearing impairment, and intellectual disability. Biallelic mutations in the XYLT2 gene (OMIM * 608125), encoding the xylosyltransferase II, were shown to be responsible for this disease. To date, 22 cases with SOS have been described, with varying clinical presentations and a yet-to-be-established genotypic–phenotypic correlation. Two patients from a consanguineous Lebanese family that presented with SOS were included in this study. Whole exome sequencing revealed a novel homozygous nonsense mutation in XYLT2 (p.Tyr414*) in these patients. We review all previously reported cases with SOS, describe the second nonsense mutation in XYLT2, and contribute to a better delineation of the phenotypic spectrum of the disease.
Forced Near-Inertial Motion and Dissipation of Low-Frequency Kinetic Energy in a Wind-Driven Channel Flow

AbstractUsing primitive equation simulations, a zonally periodic channel is considered. The channel flow is forced by a combination of steady and high-frequency winds. The high-frequency forcing excites near-inertial motion, and the focus is on how this influences the low-frequency, nearly geostrophic part of the flow. In particular, this study seeks to clarify how Reynolds stresses exerted by the near-inertial modes affect the low-frequency kinetic energy. In the system considered, the near-inertial Reynolds stresses (i) serve as a sink term in the low-frequency kinetic energy budget and (ii) transfer low-frequency kinetic energy downward from the mixed layer. Transfer spectra show the bulk of this sink to occur at relatively small horizontal wavenumber (i.e., in the mesoscale, not the submesoscale). The presence of near-inertial motion can also affect the kinetic-to-potential energy exchanges, especially within the low-frequency band.
Propedia v2.3: A novel representation approach for the peptide-protein interaction database using graph-based structural signatures

Propedia is a web database of peptide-protein interactions, which introduced a clustering approach based on three methods: (i) sequences, (ii) structure interface, and (iii) binding sites. Developed between the years 2015–2020, the first version of Propedia presented a total of 19,813 complexes peptide-protein, grouped by 1,845 sequence clusters, 1,891 interface clusters, and 1,466 binding site clusters. Here we show the first large-scale Propedia update: version 2.3. Propedia v2.3 presents over 49,300 peptide-protein complexes (an increment of approximately 150%) and introduces a new representative approach developed using graph-based structural signatures. In this data report, we also describe how the structural signatures of peptides from Propedia were calculated using the aCSM-ALL algorithm.We performed two case studies using seven machine learning algorithms to evaluate these new Propedia resources: (i) clustering based on sequences; and (ii) clustering based on six Propedia sub-dataset determined from PDB’s classification. Our analyses demonstrated that graph-based signatures could be useful in classifying peptides. Propedia v2.3 is available at http://bioinfo.dcc. ufmg.br/propedia2/.
A Modified Silver–Egg Shell Nanocomposite Applied for Antibacterial Activities

: Bacterial infections have extensive impacts on public health. Therefore, ﬁnding compounds with antibacterial properties could serve as an effective method. A nanocomposite, Ag/CaO, was prepared from silver nitrate and egg shells. After calcination of the egg shells, the remaining solid, CaO, was cooled; then, silver nitrate was added and the mixture was ground to a ﬁne powder, and ﬁnally heated to 300 ◦ C. The brown solid obtained was characterized by XRD, SEM and XRF methods. The prepared Ag/CaO was examined for antibacterial activity against Gram-positive and Gram-negative bacteria, including Keleb pneumonia, staphylococcus aureus, and Escherichia coli. We previously published a similar paper in the 25th ECSOC 2021, but the current paper has two changes, including the amount of silver nitrate and calcium oxide in the synthesis route, and the size of the ﬁrst synthesized nanocomposite by grinding with a ball mill; then, we examined these two substances against the bacteria. In fact, changing the amount of silver, known as the antibacterial metal, was compared to changing the size of the nanocomposite, which could have a greater antibacterial effect.