Miracle-dz/UniFAR-FTUs huggingface dataset:
Reducing the impact of interchannel interference on the efficiency of signal transmission in telecommunication systems of data transmission based on the ofdm signal

This paper considers the process that forms an interchannel transient interference in the structure of the signal created on the basis of the technology of parallel data transmission and frequency distribution with multiplexing of the phase-modulated signal – the OFDM signal. Based on the analysis of the OFDM signal structure, it was determined that changes in the position and parameters of the carrier symbol from the composition of this OFDM symbol create an interchannel transient interference. A list of OFDM signal parameters that can affect the appearance of interchannel interference and the value of its quantitative value was summarized and presented. A model for assessing the impact of interchannel interference on the efficiency of signal transmission in telecommunication data transmission systems based on the OFDM signal has been developed and proposed. Based on mathematical modeling using this model, the dependence of the quantitative assessment of the magnitude of the interchannel interference on the magnitude of the protective interval for different values of the interchannel value with a different number of signal pre-reception has been established. It is shown that an increase in the value of the interchannel value to 96 subchannels makes it possible to achieve an interchannel transient interference of less than 3 percent with a protective interval of more than 2 ms already with one pre-reception. This is explained by the fact that the increase in the interchannel value makes it possible to reduce the value of the protective interval and minimizes the effect of frequency distortions of the sub-channel of one channel. The data reported in this work and the recommendations substantiated on their basis confirm the possibility of the proposed model for assessing the value of the interchannel transient interference and justifying the recommendations for reducing its impact on the efficiency of signal transmission in telecommunication data transmission systems based on the OFDM signal. The proposed evaluation model can find practical application in improving existing and developing new telecommunication data transmission systems based on OFDM technology
Power and Energy-Aware Computing on Heterogeneous Systems (PEACHES) (Dagstuhl Seminar 22341)

This report documents the program and outcomes of the Dagstuhl Seminar 22341 – Power and Energy-Aware Computing on Heterogeneous Systems (PEACHES). The seminar was held on Aug 21 – Aug 26, 2022, and brought together 35 international experts from different domains across the entire system stack – from system designers to programmers and operators. We present the abstracts of 18 talks and 5 summaries of discussions and active sessions on the principal topic areas: Energy Transparency from Hardware to Software, Energy Optimisation and Management, Computing for Sustainability, Green Computing Hackathon, and Disruptive Paradigms. Seminar August 21–26, 2022 – http://www.dagstuhl. de/22341 2012
BACTERIAL ASSOCIATED WITH SWIMMING POOL WATER IN BENIN CITY, NIGERIA

Swimming pools are man-made recreational water bodies. These water bodies are supposed to be hygienic but due to human activities, they have been considered as sources of infections. The objective of this study was to ascertain the bacterial isolates found in some swimming pools in Benin City. Five swimming pools in Benin City identified as A, B, C, D and E were studied. A total of 15 samples (three from each pool) were collected in duplicates before and after the maximum bather’s load, and after the water change. Samples were analysed bacteriologically using standard methods. A total of 51 organisms were isolated with Staphylococcus epidermidis having a prevalence of 27.5 %/, Escherichia coli; 15.7 %, Staphylococcus aureus; 15.7 %, Enterobacter aerugenes; 13.7 %, Klebsiella aerogenes; 13.7 %, Pseudomonas aeruginosa; 5.9 %, Klebsiella pneumonia; 3.2% and Streptococcus faecalis; 3.2%. The mean viable colony counts of 1.60x 102 /ml, 7.33 x 102 /ml, 9.00 x 102 /ml, 1.60 x 102 /ml and 7.30 x 102 /ml at 37 oC were obtained from A, B, C, D and E pools respectively. It was observed that water from swimming pools B, C and E were contaminated with mean viable counts exceeding the recommended 200 colony counts/ml and detection of Escherichia coli in 100 ml. The high bacterial load and the isolation of pathogenic bacteria from the pools demonstrate the need for pool health authorities to improve surveillance, improve pool decontamination standards, and educate swimmers on hygiene before entering pools. This study emphasis the need for proper hygienic maintenance of swimming pools and the need for a bacteriological standard to be drawn up for swimming pools in Nigeria.
Two-dimensional imaging of edge-localized modes in KSTAR plasmas unperturbed and perturbed by n=1 external magnetic fields

The temporal evolution of edge-localized modes (ELMs) has been studied using a 2-D electron cyclotron emission imaging system in the KSTAR tokamak. The ELMs are observed to evolve in three distinctive stages: the initial linear growth of multiple filamentary structures having a net poloidal rotation, the interim state of regularly spaced saturated filaments, and the final crash through a short transient phase characterized by abrupt changes in the relative amplitudes and distance among filaments. The crash phase, typically consisted of multiple bursts of a single filament, involves a complex dynamics, poloidal elongation of the bursting filament, development of a fingerlike bulge, and fast localized burst through the finger. Substantial alterations of the ELM dynamics, such as mode number, poloidal rotation, and crash time scale, have been observed under external magnetic perturbations with the toroidal mode number n = 1.
An interior penalty Galerkin domain decomposition method based on high‐order basis function

An integral equation based domain decomposition method (DDM) has been presented to solve electromagnetic responses of arbitrary targets including conducting objects in free space and microstrip antennas and circuits. The target is decomposed into several non‐overlapping subdomains, each of which will be meshed independently. Higher‐order hierarchical Legendre basis functions are defined on each interface boundary between all adjacent subdomains. An interior penalty Galerkin procedure is implemented to ensure continuous boundary current on the interface boundary. Some numerical examples are shown to demonstrate good accuracy and effectiveness of the proposed algorithm. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1961–1965, 2015
Reconstruction and evaporation at graphene nanoribbon edges

The reconstruction and evaporation at graphene nanoribbon (GNR) edges are investigated by tight-binding molecular-dynamics simulations and ab initio calculations. It is observed that reconstruction through the formation of pentagon-heptagon pairs can take place quickly along the zigzag edge and it is energetically favorable. At very high temperatures, the armchair edge is found to change into a zigzag edge structure, which further accelerates the evaporation of carbon atoms and leads to the formation of carbon linear chains. The evaporation of carbon atoms from both the zigzag and armchair edges is preceded by the formation of heptagon rings, which serve as a gateway for carbon atoms to escape. In the simulation for a GNR armchair-zigzag-armchair junction, carbon atoms are evaporated row by row from the outermost row of the zigzag edge while the armchair edge remains nearly intact. These results can be applied to nanoelectronic devices fabrication through the temperature-controlled edge structure of GNR.
Direct design of super-narrowband fiber grating filter with discrete layer-peeling algorithm

Combined DLP algorithm and sampled theory, super-narrow FBG filter for arbitrary shaping spectrum can be successfully synthesized, and the process of design and fabrication using one uniform mask are demonstrated. A novel method for a single stage illumination to fabricate dc-free apodized sampled FBG is proposed based on the chirp of sample period. Above design and fabrication method are testified by simulation and experiment results, and a super-narrowband triangle shaping FBG filter with 25pm 3dB bandwidth and side lobes suppression beyond 20dB is fabricated.
LSIV -12 degrees 111: A Candidate Halo Proto--Planetary Nebula

We report on multiwavelength observations of LSIV −12°111, which may be an emerging halo planetary nebula. This object was previously classified as a young emission-line B-type star, but a model atmosphere abundance analysis of high-resolution optical spectra has revealed it to be an evolved object, probably in the postasymptotic giant branch (AGB) evolutionary phase. The presence of an infrared excess and low-excitation nebular emission lines implies that the central star may just have started to photoionize the circumstellar material ejected during the AGB phase. In this paper we discuss the nebular and dust properties of LSIV −12°111 and redetermine some metal abundances for the central star
On a multidimensional Volkenborn integral and higher order Bernoulli numbers

In this paper, using a multidimensional Volkenborn integral, we give a p-adic expression of the higher order Bernoulli numbers. This shows immediately the relation to the sums of products of the ordinary Bernoulli numbers of Dilcher in 1996. We also consider the Mahler expansion of several p-adic variables function, and give some examples.
Handling Nonlinearity in an Ensemble Kalman Filter: Experiments with the Three-Variable Lorenz Model

AbstractAn ensemble Kalman filter (EnKF) is optimal only for linear models because it assumes Gaussian distributions. A new type of outer loop, different from the one used in 3D and 4D variational data assimilation (Var), is proposed for EnKF to improve its ability to handle nonlinear dynamics, especially for long assimilation windows. The idea of the “running in place” (RIP) algorithm is to increase the observation influence by reusing observations when there is strong nonlinear error growth, and thus improve the ensemble mean and perturbations within the local ensemble transform Kalman filter (LETKF) framework. The “quasi-outer-loop” (QOL) algorithm, proposed here as a simplified version of RIP, aims to improve the ensemble mean so that ensemble perturbations are centered at a more accurate state.The performances of LETKF–RIP and LETKF–QOL in the presence of nonlinearities are tested with the three-variable Lorenz model. Results show that RIP and QOL allow LETKF to use longer assimilation windows with s.
State and Trait Emotion Regulation Diversity in Social Anxiety

Emotion regulation (ER) diversity, defined as the variety, frequency, and evenness of ER strategies used, may predict social anxiety severity. In a sample of individuals with high (n = 113) and low (n = 42) social anxiety severity, we tested whether four trait ER diversity metrics predicted group membership. We generalized existing trait ER diversity calculations to repeated measures data to test whether state-level metrics (using 2 weeks of ecological momentary assessment [EMA] data) predicted social anxiety severity within the higher severity group. As hypothesized, higher trait ER diversity within avoidance-oriented strategies predicted greater likelihood of belonging to the higher severity group. At the state level, higher diversity across all ER strategies, and within and between avoidance- and approach-oriented strategies, predicted higher social anxiety severity (but only after analyses controlled for number of submitted EMAs). Only diversity within avoidance-oriented strategies was significantly correlated across trait and state levels. Findings suggest that high avoidance-oriented ER diversity may co-occur with higher social anxiety severity.
BRANE REALIZATIONS OF QUANTUM HALL SOLITONS AND LIE ALGEBRAS

Using quiver gauge theories in (1+2)-dimensions, we give brane realizations of a class of Quantum Hall Solitons (QHS) embedded in Type IIA superstring on the ALE spaces with exotic singularities. These systems are obtained by considering two sets of wrapped D4-branes on 2-spheres. The space-time on which the QHS live is identified with the world-volume of D4-branes wrapped on a collection of intersecting 2-spheres arranged as extended Dynkin diagrams of Lie algebras. The magnetic source is given by an extra orthogonal D4-brane wrapping a generic 2-cycle in the ALE spaces. It is shown as well that data on the representations of Lie algebras fix the filling factor of the QHS. In case of finite Dynkin diagrams, we recover results on QHS with integer and fractional filling factors known in the literature. In case of hyperbolic bilayer models, we obtain amongst others values of filling factors appearing in graphene literature.
Finite elements coupled to electrical circuit equations in the simulation of switched reluctance drives: attention to mechanical behaviour

A method to model the switched reluctance motor is presented in this paper. The methodology is based on the simultaneous solution of the magnetic field, represented by the two-dimensional finite element method, with electrical circuit equations. With this model, the currents in the windings are calculated and the force distribution on the stator teeth is obtained. The mechanical response to magnetic forces is calculated by a finite element code.
Point process modelling of reservoir-induced seismicity

A point process procedure can be used to study reservoir-induced seismicity (RIS), in which the intensity function representing earthquake hazard is a combination of three terms: a constant background term, an ETAS (epidemic-type aftershock sequence) term for aftershocks, and a time function derived from observation of water levels of a reservoir. This paper presents the results of such a study of the seismicity in the vicinity of the Tarbela reservoir in Pakistan. Making allowance for changes in detection capability and the background seismicity related to tectonic activity, earthquakes of magnitude ≥ 2.0, occurring between May 1978 and January 1982 and whose epicentres were within 100 km of the reservoir, were used in this analysis. Several different intensities were compared via their Akaike information criterion (AIC) values relative to those of a Poisson process. The results demonstrate that the seismicity within 20 km of the reservoir correlates with water levels of the reservoir, namely, active periods occur about 250 days after the appearance of low water levels. This suggests that unloading the reservoir activates the seismicity beneath it. Seasonal variations of the seismicity in an area up to 100 km from the reservoir were also found, but these could not be adequately interpreted by an appropriate RIS mechanism.
Quantum theory for two-photon-state generation by means of four-wave mixing in optical fiber

We present a quantum theory for generating two-photon states by means of four-wave mixing in optical fiber. We start with an interaction Hamiltonian that can correctly describe all nonlinear interactions among the four waves present in the fiber, namely, the frequency non-degenerate pumps, signal, and idler, including the terms responsible for self-phase modulation (SPM), cross-phase modulation (XPM), and four-photon scattering (FPS). The exact form of this Hamiltonian is obtained through comparison between the classical and quantum equations of motion. The two-photon state is then calculated by means of first-order perturbation theory. It turns out that only the FPM and the pump SPM terms contribute to the formation of the two-photon state. The entangled nature of this state is verified in a coincidence counting experiment. The results of the theoretical calculation agree well with experimental data.
A Search for Helium in Ultramassive White Dwarfs

We have obtained extreme ultraviolet (EUV) spectra of eight hot, ultramassive white dwarfs (M = 0.9-1.3 M☉) with the Extreme Ultraviolet Explorer. The stars are, on average, twice as massive as normal white dwarfs. The relatively high turnout of ultramassive white dwarfs in EUV surveys is difficult to explain in the context of single-star evolution, and it has been suggested that ultramassive white dwarfs may result from the merger of two normal white dwarfs. The final configuration of merged white dwarfs is uncertain, but the resulting stars may have peculiar atmospheric compositions similar to the ultramassive DAO white dwarf GD 50. Our analysis of the EUV spectra of massive white dwarfs shows that all objects, with the possible exception of the magnetic white dwarf PG 1658+441, have EUV continuum emission characteristic of pure hydrogen atmospheres and that the peculiar atmospheric composition of the white dwarf GD 50 remains a unique phenomenon.
An Integrated Energy Control System to Provide Optimum Demand Side Management of a Grid-Interactive Microgrid

Abstract The use of renewables can make it more challenging to maintain a balance between supply and demand in microgrids due to their variable generation profiles. To address this issue, microgrids can be designed to be grid-interactive or to include energy storage units, or both. Additionally, demand-side management (DSM) strategies can be implemented to facilitate control during peak periods. This paper presents a control system for a grid-interactive microgrid with photovoltaic (PV) panels and energy storage units. The proposed system uses a fuzzy-based algorithm to control the energy storage units and provides DSM through the use of a hybrid daily pricing model that combines multi-time rate and inclining block rate pricing methods. To optimize the global maximum power point of the PV panels under partial shading conditions, the microgrid model is tested with several metaheuristic optimization algorithms, including particle swarm optimization (PSO), gray wolf optimization (GWO), and dragonfly algorithm (DA). A hybrid algorithm that combines PSO and DA is also proposed. The resulting integrated control system includes both demand-side and grid-side control operations.
Membrane inlet—ion mobility spectrometry with automatic spectra evaluation as online monitoring tool for the process control of microalgae cultivation

The cultivation of algae either in open raceway ponds or in closed bioreactors could allow the renewable production of biomass for food, pharmaceutical, cosmetic, or chemical industries. Optimal cultivation conditions are however required to ensure that the production of these compounds is both efficient and economical. Therefore, high‐frequency analytical measurements are required to allow timely process control and to detect possible disturbances during algae growth. Such analytical methods are only available to a limited extent. Therefore, we introduced a method for monitoring algae release volatile organic compounds (VOCs) in the headspace above a bioreactor in real time. This method is based on ion mobility spectrometry (IMS) in combination with a membrane inlet (MI). The unique feature of IMS is that complete spectra are detected in real time instead of sum signals. These spectral patterns produced in the ion mobility spectrum were evaluated automatically via principal component analysis (PCA). The detected peak patterns are characteristic for the respective algae culture; allow the assignment of the individual growth phases and reflect the influence of experimental parameters. These results allow for the first time a continuous monitoring of the algae cultivation and thus an early detection of possible disturbances in the biotechnological process.
Shielding effect of hollow chiral sphere

The low-frequency shielding effect of a spherical layer is studied. The layer is made of a chiral material and it is electromagnetically characterized with three material parameters: permittivity, permeability, and chirality. Due to chirality, there is magnetoelectric coupling. The electric and magnetic shielding effects are derived and are shown to be functions of the three material parameters and also the relative thickness of the layer. Illustrations display the effects of the various parameters on the shielding, which is different for the magnetic and electric fields. Among the special effects is that the shielding increases rapidly as the chirality parameter approaches the refractive index of the shell. This makes chiral shells in principle effective shields, and in the future they may offer an alternative to conducting materials for novel shielding applications.
Recovery utilization of triolein for producing short chain alkane by combining biocatalysis and inorganic catalysis

ABSTRACT The production of waste cooking oil (WCO) has been increasing year by year and brought the serious environmental problems. A considerable research effort has been focused on the reuse of WCO. Utilizing the triolein existing in great quantity on olive oil and rapeseed oil is an effective strategy to realize the reuse of WCO. This work introduces a novel process for producing short-chain alkane from triolein based on the convenience of products separation. The continuous process including the hydrolysis of triolein into fatty acid by lipase, the oxidation of fatty acid for producing short-chain fatty acid, and the light-driven decarboxylation of short chain fatty acids was established to produce alkane. The feasibility of the proposed process was demonstrated using model substances. The influences of various operational parameters on hydrolysis, oxidation, and decarboxylation using model substances were studied systematically. The optimized yields of the hydrolysis, oxidation, and decarboxylation reactions were 78.7%, 52.1%, and 78.9%, respectively. The free lipase is reused under the optimal condition and observed that 31.9% decay in catalytic activity even 5 cycles. Immiscible reaction systems are used to facilitate separation of products. The decarboxylation with decarboxylase (CvFAP) for short-chain fatty acid lead to higher alkane yields in 15 min. In addition, the octane yield of 16.2% using triolein as the raw material was obtained in the continuous process. Although this approach results in a low total yield of gasoline, it highlights the potential applications in the production of hydrocarbon fuel with WCO.
Electrorheology of polyaniline-coated silica particles in silicone oil

The electrorheology of silica particles coated with protonated polyaniline or polyaniline base in silicone oil has been studied. The behaviour of suspensions has been compared with those of bare silica particles and polyaniline base powder. For a 1 wt. % suspension of polyaniline base, the low-shear viscosity (at 7.69 s-1) increased more than 25 times in the presence of the electric field, while the upper-shear viscosity (623 s-1) approached this value in its absence. In suspensions of coated silica particles, the viscosity increase was much lower, only a little higher than in a suspension of dry silica particles. The electrorheological performance of these systems is discussed in connection with the polarization characteristics resulting from the frequency spectra of permittivity and dielectric loss of suspensions and from the particle dipole coefficient.
Spiritual tourism: understandings, perspectives, discernment, and synthesis

ABSTRACT The prolific and increasing number of academic studies concerned with spiritual tourism echoes humans’ enduring quest for spirituality through travel and the entanglement of many destinations in this unique form of social activity. Yet, what we know about spiritual tourism remains equivocal and unsynthesized. This critical review, followed by a thematic analysis offers a comprehensive and rigorous overview of the nexus between spirituality and tourism. It codifies how contemporary researchers understand, theorize and study this social phenomenon, allowing us to provide an in-depth comprehension and synthesis of spiritual tourism. The significance of this study rests in its scope and capacity to inform tourism scholars working in the fields of sociology, management, psychology, and theology.