Miracle-dz/UniFAR-FTUs huggingface dataset:
Entire-domain Galerkin method for analysis of metallic antennas and scatterers

The paper presents the general theory of an entire-domain Galerkin method for the analysis of metallic (i.e. perfectly conducting) antennas and scatterers. The antenna and scatterer surfaces are approximated by generalised quadrangles (i.e. curved curvilinear quadrangles defined by means of parametric equations, whose edges coincide with local coordinate lines). Surface currents are expanded in such local coordinate systems and the general form of the corresponding electric field integral equation is derived. A procedure is decribed for obtaining entire-domain basis functions which satisfy automatically the continuity equation along the surface element interconnections and free edges, and the expressions are derived for the impedance matrix elements in this case. Starting from the general theory, two new particular methods are presented. The first is intended for the analysis of general structures, and is based on application of truncated cones and bilinear surfaces for the approximation of geometry. The second is aimed for the analysis of spherical scatterer, and is based on the application of generalised rectangular elements which follow the sphere shape. Both methods use polynomials for approximation of currents. Very good agreement of the results obtained by the proposed method with available experimental and numerical results is achieved by using small number of unknowns per wavelength squared (about ten for large surfaces of simple form).
ANTENATAL FACTORS AFFECTING THE DECISION TO HAVE AN ORAL GLUCOSE TOLERANCE TEST

Aim We aimed to investigate the factors that may affect the pregnant’s decision to have an oral glucose tolerance test (OGTT) between 24-28 gestational weeks. Material and Methods This descriptive and cross-sectional study was conducted prospectively with 307 pregnant women. Demographic characteristics of the pregnant women, pregnancy follow-up findings, antenatal tests, and their decision for having an OGTT were questioned and recorded. All the factors were analyzed that may have a possible effect on the OGTT decision. Results Fifty-three percent of the participants had OGTT during pregnancy. The rate of positive OGTT was found to be 8.5%. Body mass index, gravida, history of abortion, miscarriage risk, weight gain during pregnancy, the rate of using antenatal folic acid and iron supplementation were similar between the groups that had and did not have OGTT (p >0.05). In the univariate model, age, parity, planned pregnancy, regular follow-up, educational status and physical activity were found to have a significant effect on predicting patients who will have OGTT (p <0.05). Also, antenatal screening tests and level 2 obstetrics ultrasonography were shown to have a significant independent effect in predicting patients who will have OGTT (p <0.05). Conclusion By evaluating the factors that may affect the decision of pregnant about OGTT during pregnancy follow-up, we can predict the patients who tend not to have GDM screening and we can increase the screening rate by giving these pregnant women more detailed information. Thus, we have a chance to diagnose and treat more GDM and reduce related mortality and morbidity.
Competition between distributed and localized buoyancy fluxes in a confined volume

We investigate the convection and density stratification that form when buoyancy fluxes are simultaneously applied to a finite volume in both a turbulent buoyant plume from a small source and as a uniform heat flux from a horizontal boundary. The turbulent plume tends to produce a stable density stratification, whereas the distributed flux from a boundary tends to force vigorous overturning and vertical mixing. Experiments show that steady, partially mixed and partially stratified states can exist when the plume buoyancy flux is greater than the distributed flux. When the two fluxes originate from the same boundary, the steady state involves a balance between the rate at which the mixed layer deepens due to encroachment and vertical advection of the stratified water far from the plume due to the plume volume flux acquired by entrainment. There is a monotonic relationship between the normalized mixed layer depth and flux ratio R (boundary flux/plume flux) for 01. The stable density gradient in the stratified region is primarily due to the buoyancy from the plume but is strengthened by a stabilizing temperature gradient resulting from entrainment of heat into the plume from the mixed layer. This result may be relevant to the upper oceans of high latitude where there is commonly a destabilizing heat flux from the sea surface as well as more localized and intense deep convection from the surface. For the case of fluxes from a plume on one boundary and a uniform heat flux from the opposite boundary the shape of the density profile is that given by the Baines & Turner (1969) ‘filling-box’ mechanism, with the gradient reduced by a factor (1 + R) due to the heating. Thus, when R<−1 there is no stratified region and the whole water column overturns. When 0>R>−1, the constant depth of the convecting layer is determined by a balance between buoyancy and turbulent kinetic energy in the outflow layer from the plume.
Asymptotic expansions of the k nearest neighbor risk

The finite-sample risk of the k nearest neighbor classifier that uses a weighted L p -metric as a measure of class similarity is examined. For a family of classification problems with smooth distributions in R n , an asymptotic expansion for the risk is obtained in decreasing fractional powers of the reference sample size. An analysis of the leading expansion coefficients reveals that the optimal weighted L p -metric, that is, the metric that minimizes the finite-sample risk, tends to a weighted Euclidean (i.e., L 2 ) metric as the sample size is increased. Numerical simulations corroborate this finding for a pattern recognition problem with normal class-conditional densities.
Predicting the mental health quality of adolescents with intensive exposure to metaverse and its counseling recommendations in a multicultural context

Metaverse—an incredible medium that combines features of virtual reality platforms such as online games, social media, and the Internet—is predicted to bring significant changes to human behavior. It is believed that social interaction and the quality of mental health can be at risk once Metaverse becomes more prevalent with adolescents predicted to be the most vulnerable group. This study intends to prove this prediction by examining the effect of online game addiction and social media addiction on the mental health quality of adolescents as the majority group with Metaverse access. This correlational study involved 700 students from 14 schools in the greater Malang area. Data were collected through the Metaverse Impact Instrument (MII) and analyzed partially using the T-test and simultaneously using the F-test to know the contribution of gender using an independent sample T-test. Previously, the assumptions of multicollinearity and heteroscedasticity assumption were also tested. The results indicate that online games and social media negatively affect mental health at a rate of 31.5%. These results provide empirical evidence for theoretical predictions regarding the impact of Metaverse on mental health quality in adolescents. As a follow-up, research is needed to develop educational intervention strategies, appropriate guidance, and counseling services that purpose is to: 1) integrate cultural and religious values into character education; 2) anticipate the potential risks of metaverse among adolescents.
A new approximation for the dynamics of topographic Rossby waves

ABSTRACT A new theory of non-harmonic topographic Rossby waves over a slowly varying bottom depth of arbitrary, 1-D, profile is developed based on the linearised shallow water equations on the f-plane. The theory yields explicit approximate expressions for the phase speed and non-harmonic cross-slope structure of waves. Analytical expressions are derived in both Cartesian and Polar coordinates by letting the frequency vary in the cross-shelf direction and are verified by comparing them with the numerical results obtained by running an ocean general circulation model (the MITgcm). The proposed approximation may be suitable for studying open ocean and coastal shelf wave dynamics.
Conditional logistic regression with missing data

Methods for parameter estimation in conditional logistic regression analysis with missing data are compared in a simulation study. The data consist of a matching variable and two covariates, one of which has missing values. Sample size, percent of data missing, and the relationships between the variables are varied. Four methods are compared when the covariates are continuous: 1) Analysis based on only the complete cases, 2) Substituting the mean of the observed values for the missing value, 3) Regressing the missing value on the remaining variables in the stratum and 4) Adding a random component to the predicted value obtained from the regression. Four additional methods are compared in the situation when the variable with missing values is dichotomous. Linear regression methods are modified and two methods based on logistic regression are employed. Percent relative bias, confidence interval width and confidence interval coverage are compared. In general, the complete case method and the regression metho.
Correlation of Postoperative Outcomes According to the Amount of Prostatic Tissue Removed in Patients Undergoing Transurethral Resection of the Prostate

Objective: The present study assesses the effect of the proportion of tissue resected during transurethral resections of the prostate (TUR-P) on lower urinary tract symptoms (LUTS) and other parameters in patients with a benign prostatic obstruction (BPO). Materials and methods: Forty-three patients who underwent TUR-P between 2018 and 2021 were assessed prospectively. The patients were divided into two groups according to the percentage of tissue removed (group 1 <30%, group 2 >30% resection). Age, prostate volume, amount of resected tissue, operative time, length of hospital stay, duration of catheterization, International Prostate Symptom Score (IPSS), quality of life score (QoL), maximum urinary flow rate (Qmax), and serum prostate-specific antigen (PSA) (ng/dl) at preoperative and postoperative three months were recorded. Results: The percentage of tissue removed was 22.2% vs. 48.4% (p = 0.001), IPSS reduction was 77.7% vs. 83.3% (p = 0.048), QoL improvement was 77.2% vs. 84.8% (p = 0.133), Qmax increase was 171.3% vs. 193.5% (p = 0.032), and serum PSA decrease was 56.4% vs. 69.2% (p = 0.049) in groups 1 and 2, respectively. In addition, the operative time was 38.5 vs. 53.6 min (p = 0.001), the length of hospital stay was 2.0 vs. 2.4 days (p = 0.001), and the duration of catheterization average was 4.1 vs. 4.9 days (p = 0.002). Conclusion: Resections of at least 30% of prostatic tissue can provide a significant improvement in the symptoms and parameters related to benign prostatic obstruction, while resections of less than 30% of prostatic tissue can effectively reduce urinary symptoms and improve the quality of life in older adult patients with comorbidities who require shorter operating times.
Optimal dynamic reinsurance with dependent risks: variance premium principle

In this paper, we consider the optimal proportional reinsurance strategy in a risk model with two dependent classes of insurance business, where the two claim number processes are correlated through a common shock component. Under the criterion of maximizing the expected exponential utility with the variance premium principle, we adopt a nonstandard approach to examining the existence and uniqueness of the optimal reinsurance strategy. Using the technique of stochastic control theory, closed-form expressions for the optimal strategy and the value function are derived for the compound Poisson risk model as well as for the Brownian motion risk model. From the numerical examples, we see that the optimal results for the compound Poisson risk model are very different from those for the diffusion model. The former depends not only on the safety loading, time, and the interest rate, but also on the claim size distributions and the claim number processes, while the latter depends only on the safety loading, time, and the interest rate.
On vortex/wave interactions. Part 1. Non-symmetrical input and cross-flow in boundary layers

The paper studies certain effects of non-symmetry on vortex/wave interactions, for inviscid inflexional waves interacting nonlinearly with the vortex component of the mean flow in boundary-layer transition at large Reynolds number. Two types of non-symmetry are investigated, namely for unequal input wave amplitudes and for small cross-flows. These lead to coupled integro-differential equations for spatial development of the wave amplitudes, which are examined in an essentially equivalent differential form for various degrees of the non-symmetry present. Each type of non-symmetry can have a significant influence on the nonlinear interaction properties. Special emphasis is given to bounded solutions, and numerous interesting new flow responses are found analytically and computationally. The theory provides a basis for tackling enhanced non-symmetry in the input or stronger cross-flows.
Flow Characteristics of Synthetic Jet Induced by Plasma Actuator

The flowfield induced by a plasma synthetic jet actuator was investigated by solving Reynolds-averaged Navier- Stokes equations, augmented with a phenomenological model representing the plasma-induced body force imparted by a plasma actuator on the fluid. Flow characteristics of an unsteady plasma synthetic jet in quiescent air were presented. The results indicate that the time-averaged flowfield is quite similar to the steady plasma synthetic jet, the traditional blowing synthetic jet, and the plane jet. The time-averaged streamwise velocity is a little smaller than that of the steady case, but the jet half-width is much larger. This makes the volume and momentum flux of an unsteady plasma synthetic jet larger. With unsteady actuation, a plasma synthetic jet does not exhibit the suction effect of the cavity during the second half-period, as does the traditional blowing synthetic jet. The vortex pair, formed from the wall jets that are produced by plasma actuators, has a strong unsteady effect on the plasma synthetic jet close to the wall. In the far field, the vortex pair coalesces and eventually develops to a continuous jet.
What is mineral informatics?

Abstract Minerals are information-rich materials that offer researchers a glimpse into the evolution of planetary bodies. Thus, it is important to extract, analyze, and interpret this abundance of information to improve our understanding of the planetary bodies in our solar system and the role our planet’s geosphere played in the origin and evolution of life. Over the past several decades, data-driven efforts in mineralogy have seen a gradual increase. The development and application of data science and analytics methods to mineralogy, while extremely promising, has also been somewhat ad hoc in nature. To systematize and synthesize the direction of these efforts, we introduce the concept of “Mineral Informatics,” which is the next frontier for researchers working with mineral data. In this paper, we present our vision for Mineral Informatics and the X-Informatics underpinnings that led to its conception, as well as the needs, challenges, opportunities, and future directions of the field. The intention of this paper is not to create a new specific field or a sub-field as a separate silo, but to document the needs of researchers studying minerals in various contexts and fields of study, to demonstrate how the systemization and enhanced access to mineralogical data will increase cross- and interdisciplinary studies, and how data science and informatics methods are a key next step in integrative mineralogical studies.
Genetic diversity analysis among soybean (Glycine max) genotypes based on agro morphological characters

The experiment was carried out to study the extent of genetic diversity among the 75 genotypes of soybean [Glycine max (L.) Merr. ] under rainfed condition of Manipur by employing Mahalanobis DÂ² analysis based on 13 morphological characters. The 75 genotypes of soybean were grouped into 9 clusters. Maximum numbers of genotypes were included in the cluster I comprising 28 genotypes followed by cluster II with 13 genotypes, cluster IV with 12 genotypes, cluster III and cluster V with 9 genotypes each and clusters VI, VII, VIII and IX with 1 genotype each. The value of intra-cluster distances ranged from 0.00 to 1181. The highest inter cluster distance (8937) was observed between cluster III and IX. The character plant height (34.13%) contributed highest to the total divergence of the genotypes, followed by pods/plant (29.62%) and days to 80% maturity (14.59%). The highest cluster means values for yield and its component characters were observed in cluster IX. On the basis of inter-cluster distance, cluster mean values, mean per se performance it is advisable to attempt crosses between genotypes from cluster III and cluster IX which may lead to obtaining higher heterotic effect and broad spectrum variability in the segregants.
A Mixed-method Study on the Bright Side of Organizational Change: Role Clarity and Supervisor Support as Resources for Employees’ Resilience

ABSTRACT This mixed-method study aims to analyze how and when employees’ perceptions of positive organizational change may be related to role clarity and resilience and conditional on supervisor support levels. A total of 40 employees participated in focus groups. Thematic analysis revealed that participants perceived differently organizational change, role, supervisor support, and resilience. A total of 178 employees completed questionnaires analyzing perceptions of organizational change, role clarity, resilience, and supervisor support. Quantitative analyses revealed that role clarity mediated the association between employees’ perceptions of positive organizational change and resilience. This relationship was enhanced by supervisor support. Overall, the results suggest that employees who positively perceive organizational change may more easily understand their new role and demands, which is positively related to their resilience. When employees perceive being supported by their supervisors, they are more likely to perceive themselves as resilient, even in the face of organizational change. Our results suggest that organizations should adopt a transparent change management communication plan based on employee involvement. MAD statement This study moves an important step forward in both the change management and resilience literature, as it is the first to examine the mechanisms and boundary conditions explaining how and when employees’ perceptions of positive organizational change may facilitate resilience. By adopting a positive psychology perspective and a mixed-method design, this study identifies role clarity and supervisor support as two important resources that allow employees to benefit from organizational change. As such, it would contribute to providing new insights on how employee resilience can be enabled during organizational change.
High gradient magnetic separation for weakly magnetized fine particles [for geothermal water treatment]

We measured the removal efficiency of hematite (Fe/sub 2/O/sub 3/) and iron (III) hydroxide (Fe(OH)/sub 3/) fine particles suspended in water in a high gradient magnetic separation (HGMS) system. Fe/sub 2/O/sub 3/ and Fe(OH)/sub 3/ have relatively small magnetic relative susceptibilities (MKS) near 10/sup -3/ and average particle diameters near 1 /spl mu/m. We demonstrated that HGMS is able to effectively separate weakly magnetized particles.
Monte Carlo Approach to Modeling of Boundary Conditions for the Diffusion Equation

A Monte Carlo scheme is proposed to obtain boundary conditions for the photon-diffusion equation. For a turbid medium with interfaces to nonscattering media, we introduce an interpolated boundary, at a distance of a few transport-mean-free paths from the physical boundary, which acts as the secondary source emitting photons in various directions. The ratio of the fluence rate to the flux is evaluated at both the interpolated and the physical boundaries. The derived boundary conditions are compared with other works and are supported by an independent simulation of an effective source term. [S0031-9007(98)06369-8]
What Are These Blue Metal-Poor Stars?

The radial velocity behavior and chemical compositions of sixty-two blue metal-poor (BMP) stars have been established from more than 1200 echelle spectra obtained at Las Campanas Observatory from 1992 through 1999. Analysis of survey spectra provides abundances for this sample, which we use to calibrate the K line versus B-V relation. Forty-four of the stars have [Fe/H] < -1, while eighteen lie on -1 < [Fe/H] < 0. One star, the SX Phe variable CS 22966-043, appears to be the most extreme example of a rare abundance class characterized by α-element deficiencies, high [Cr/Fe], [Mn/Fe], and [Ti/Fe], and extremely low [Sr/Fe] and [Ba/Fe]. Of the 62 stars, 17 appear to have constant radial velocities, while 42 are definite or probable members of binary systems. The binary fraction of BMP stars appears to be independent of chemical composition. The high binary fraction fBMP ∼ 0.6 of BMP stars compared with that found for the F- and G-type stars near the Sun, the systematically low mass functions of these binaries, and the paucity of double-lined binaries among them lead us to suggest that at least half of the BMP binaries are blue stragglers and that these blue stragglers are formed by McCrea mass transfer rather than by the various merger processes that are currently believed to produce most blue stragglers in globular clusters. This conclusion is supported by the abnormally high proportion of BMP binaries with long periods and small orbital eccentricities, properties these binaries share with McClure's carbon star binaries. The great majority of field blue stragglers (BSs) probably are created by Roche-lobe overflow during red giant branch evolution. Primaries of more widely separated binaries that survive this phase of stellar evolution may engage in mass transfer during subsequent asymptotic giant branch evolution to form s-process abundance enhanced carbon stars. Our result requires a major downward revision of the fraction of BMP stars attributed to a captured intermediate-age population of metal-poor field stars. The high original estimate of the size of this component probably arose from improper use of the globular cluster BS specific frequency, SBS = n(BS)/n(HB)∼1, to estimate the halo BS space density. We use a simple model to calculate the specific frequency of BSs produced by McCrea mass transfer in an old metal-poor population with a given primordial binary fraction fB. Our model calculations return values of SBS ∼ 5 for fB = 0.15, much more like our value for the field blue stragglers. We suggest that globular clusters either destroy the primordial binaries that produce long period BS binaries like those in the Galactic field reported here, or they never possessed them.