Miracle-dz/UniFAR-FTUs huggingface dataset:
Detection of p-Mode Pulsations and Possible Ellipsoidal Luminosity Variations in the Hot Subdwarf B Star KPD 1930+2752

We report the discovery of multiperiodic luminosity variations in the hot B subdwarf KPD 1930+2752. This star was selected as a potential target in the course of our ongoing survey to search for pulsators of the EC 14026 type. Our model atmosphere analysis of the time-averaged optical spectrum of KPD 1930+2752 indicates that this star has Teff ≃ 33,280 K and log g ≃ 5.61, which places it well within the theoretical EC 14026 instability strip. At least 44 harmonic oscillations are seen in the light curve, with periods in the range 145-332 s, and amplitudes in the range 0.064%-0.451% of the mean brightness of the star. In addition, the light curve is dominated by a nearly sinusoidal variation with a period of ~4108.9 s and amplitude of ~1.39%. This latter variation is unique among the known EC 14026 stars. We argue that this relatively slow luminosity variation is likely due to the ellipsoidal deformation of the sdB star in a close binary system containing a faint invisible companion (possibly a white dwarf). Using a new period-matching technique based on a genetic algorithm, we demonstrate that the dense observed period spectrum in the 145-332 s interval is compatible with a theoretical low-degree p-mode spectrum that is rotationally split in a star rotating with a period of ~8217.8 s, the value expected from the ellipsoidal effect invoked to explain the observed long-period variation. This interpretation awaits the test of time-resolved spectroscopy. If confirmed, the potential of KPD 1930+2752 as a laboratory for EC 14026 seismology will become immense.
Perceived price, eTrust, eSatisfaction, and online repurchase intention: A study of young online consumer behavior

The online marketplace industry in Indonesia is growing rapidly, becoming an important contributor to Indonesia's economy. However, the massive discount price strategy and the dearth of face-to-face interaction in the online marketplace make it harder for any online retailer to build a stronger relationship with their consumers to retain them. Our study offers several contributions and new insights to the marketing literature as few studies have addressed this issue by analyzing it with perceived electronic trust, satisfaction, and repurchase intention into a single framework. This study aims to describe and extend previous studies on the effect of perceived price and trust on repurchase intention by specifically including satisfaction in the middle of associated constructs. This study uses purposive sampling as a sampling technique and a five-point Likert scale survey as a data collection method. A total of 387 valid data were collected and then analyzed by PLS-SEM to test the proposed model. The results of this study strengthen the previous claims that there is a positive partial effect between perceived price, trust, and satisfaction on repurchase intention in the online marketplace. Also, the level of customer satisfaction proved to be a significant construct in forming the association between perceived price, trust, and repurchase intention in the study.
Mergers and bias in a cold dark matter cosmology

A dissipative N-body code is used to follow the evolution of a cold dark matter spectrum in an Omega = 1, h = 0.5 background. The star and galaxy formation in boxes of three different sizes is shown, and the relative degrees of clustering of dark matter, halos, and galaxies is discussed and used to normalize to the current epoch. The streaming velocities of the galaxies and dark matter are measured and compared with linear theory. The pairwise velocities of the galaxies and dark matter are studied and used with estimates of galactic merger rates to discuss the role that mergers play in galaxy formation. The number density-redshift relation of galaxies is shown to be well described by the statistical description of density perturbation peaks by Bardeen et al. (1986), whereas halos are better fitted by the volume-averaging, hierarchical model of Press and Schechter (1974). The model galaxies exhibit only a modest enhancement of their two-point correlation function over that of the dark matter. 44 refs.
Raman investigation of damage caused by deep ion implantation in diamond

Raman microscopy has been employed to investigate the nature of damage created when natural type-IIa diamond is irradiated with MeV alpha particles. Three features appear in the Raman spectrum due to damage, viz., (i) the first-order diamond Raman line is broadened and downshifted, (ii) broad features appear which are a measure of the vibrational density of states of ion-beam-amorphized diamond, and (iii) the damage causes the appearance of sharp defect-induced Raman peaks at 1490 and 1630 cm-1. For damage below an amorphization threshold, a linear relationship exists between the full width at half maximum and frequency shift, which shows that these are Kramers-Kronig related. The annealing behavior of the sharp Raman feature at 1490 cm-1 suggests that this peak is associated with vacancies with an activation energy for annealing of 4.06 eV, while the 1630-cm-1 peak is due to an interstitial related defect with an activation energy of 1.2 eV. For sub-MeV ion irradiation, damage beyond the critical amorphization level usually leads to relaxation of the diamond structure to graphite upon thermal annealing. However, for MeV ion irradiation, it was found that annealing, even when the ion induced damage level is well above the amorphization threshold, could restore the original diamond structure. We attribute this result to the high internal pressure the damaged layer is subjected to which does not allow relaxation to graphitically bonded structures.
Dividend policy, ownership structure and corporate governance: An empirical analysis of Indonesian firms

One of the essential aspects of corporate policy is the decision on dividend payments as this dividend policy affects the value of the company. This study aims to determine whether there is a possible association between dividend policy, ownership structure, and corporate governance of Indonesian financial firms. This study offers empirical evidence on the relationship between variables in the context of Indonesia, which is a frontier market. The sample includes financial firms listed on the Indonesia stock exchange during the period between 2011 and 2017. Data analysis techniques were performed by using ordinary least square regression. Based on the result of 242 observed data analyses, it was found that while managerial ownership has no significant but positive effect on the dividend payout ratio, institutional ownership has significant and negative effects on dividend policy for sample firms. This positive relationship reflects that increasing the percentage of managerial ownership at one particular point, will make managers think that there is no longer any benefit in increasing dividend payout. Moreover, the total number of directors has a significant negative effect on dividend payout and the percentages of an independent members of directors have a positive but not significant effect on dividend policy. This result reflects that the independent board has an essential role in directing management to protect stakeholders' interest in the company. The study also reclaimed that dividend policy is positively and significantly influenced by profitability but inversely proportional to capital structure.
EARLY-TIME BEHAVIOR OF THE EKMAN LAYERS IN SPIN-UP OF A RAPIDLY-ROTATING GAS

A numerical study is made of the early-stage behavior of spin-up flows of a highly compressible fluid in a rapidly-rotating cylinder. The focus is placed on describing the temporally small-scale motions within and near the Ekman layers. Numerical solutions are acquired to the full, time-dependent, compressible Navier-Stokes equations. The numerical results are processed to render physically meaningful interpretations of the small-time behavior in and around the Ekman layer. Vector plots on the meridional plane are constructed to illustrate the prominence of the compressible Rayleigh effect in the nonlinear regime. The emergence of the corner jet is portrayed. Extensive diagnostic studies are performed to disclose the dominant dynamic effects. Time-histories of the major physical variables are plotted. The time needed for the formation of the Ekman layer is seen to shorten in the nonlinear regime. The oscillatory behavior is clearly depicted, and it is demonstrated that, as the nonlinearity strengthens, th.
The Effect of Self-Employment on Health: Evidence from Longitudinal Social Security Data

The growth of novel flexible work formats raises a number of questions about their effects upon health and the potential required changes in public policy. However, answering these questions is hampered by lack of suitable data. This is the first paper that draws on comprehensive longitudinal administrative data to examine the impact of self-employment in terms of health. It also considers an objective measure of health – hospital admissions – that is not subject to recall or other biases that may affect previous studies. Our findings, based on a representative sample of over 100,000 individuals followed monthly from 2005 to 2011 in Portugal, indicate that the likelihood of hospital admission of self-employed individuals is about half that of wage workers. This finding holds even when accounting for a potential self-selection of the healthy into self-employment. Similar results are found for mortality rates.
The mass and velocity anisotropy of the Carina, Fornax, Sculptor and Sextans dwarf spheroidal galaxies

We model the large kinematic data sets for the four Milky Way dwarf spheroidal (dSph) satellites: Carina, Fornax, Sculptor and Sextans, recently published by Walker et al. The member stars are selected using a reliable dynamical interloper removal scheme tested on simulated data. Our member selection is more restrictive than the one based on metallicity indicators as it removes not only contamination due to Milky Way stars but also the unbound stars from the tidal tails. We model the cleaned data sets by adjusting the solutions of the Jeans equations to the profiles of the projected velocity dispersion and kurtosis. The data are well reproduced by models where mass follows light and the best-fitting stellar orbits are isotropic to weakly tangential, as expected from the tidal stirring scenario. The Fornax dwarf, with more than 2400 member stars, is a dSph galaxy with the most accurately determined mass to date: its 1σ error following from the sampling errors of the velocity moments is below 5 per cent. With mass-to-light ratio of 97 solar units, Sextans seems to be the most dark matter dominated of the four dSph galaxies.
Impact of Social Support on the Psychosocial Adjustment of Children Living with a Disability (CLWD) as Perceived by Parents in the Lagos Metropolis

Disability in Africa is usually viewed as a consequence of evil. Thus, people living with disabilities tend to be treated with discrimination and stigmatization, which then leads to the neglect of their needs. A majority of children in this group are helpless and unable to function effectively. Hence, giving them the support they need is important to help them live a purposeful life. This research thus sought to determine the impact of social support on the psychosocial adjustment of children living with disabilities (CLWDs) as perceived by parents in the Lagos metropolis. It examined the differences in the parents’ perceptions based on gender, age, and educational attainment. The study was a descriptive survey of the ex-post facto design where a multi-stage sampling technique was used to select the respondents. The final sample comprised 384 parents in the Lagos metropolis who responded to a 20-item researcher-developed questionnaire on perceived impact of social support (with α = .72 reliability estimate). An independent samples t-test testing for gender differences in parents’ perception and two sets of ANOVAs were used to test three null hypotheses at the . 05 confidence level. The results revealed that increased self-esteem, positive behavioural adjustment and improved mental health were perceived by Lagos parents to be the most important impact factors of social support on the psychosocial adjustment of CLWDs. Gender and educational attainment did not exercise any influence on perceived impact, but parents’ perception of it did differ significantly by age group where older parents perceived a greater impact than did younger parents. It was, therefore, concluded that social support (i.e., in terms of quality, type and amount) is significant for CLWDs to make the psychosocial adjustment needed in their lives. With such support, they can be useful to themselves and contribute meaningfully to the development of society. On this basis, family members and other support providers should give adequate attention to the needs of children living with disabilities.
A preconditioned dual time-stepping procedure coupled with matrix-free LU-SGS scheme for unsteady low speed viscous flows with moving objects

In this paper an effective method is developed to solve unsteady low speed viscous flow problems with moving objects by using the governing equations of compressible fluids. The method is based on a dual time-stepping scheme, combined with low Mach number preconditioning and an implicit matrix-free Lower-Upper Symmetric Gauss-Seidel iteration on unstructured dynamic meshes. Because preconditioning modifies the governing equations, that induces the change of system's eigenvalues and eigenvectors, characteristic boundary conditions are also modified to suit the preconditioned characteristic system. Several test cases are simulated, including an in-line oscillating cylinder in a fluid at rest, flow over a flapping NACA0014 airfoil and low speed flow past a flapping-wing micro-air vehicle. Compared with experimental results whenever possible, the computed results indicate that this algorithm shows satisfactory improvement of solution efficiency and accuracy for low speed flow problems.
Relationship between Sources of Stress and Work Performance among Nurses Working in Psychiatric Hospital

Background: Stress, up to a certain point, will improve psychiatric nurse’s work performance and their quality of life because it is healthy but if stress becomes excessive, it loses its beneficial effect and becomes harmful. Aim of the study: The study aimed to determine relation between sources of stress and work performance among the nurses working in psychiatric hospital. Research design: Descriptive\correlation design was used in this study. Setting: This study was conducted at Psychiatric Mental Health and Treating Addiction Hospital in Benha city, Qalubia Governorate. Subject: Convenient sample from psychiatric nurses, Total sample was (220) nurses (85 females and 135 male) from the previous study setting. Tools: Three tools were used for data collection. Tool (1): A structured interviewing questionnaire. Tool (2): Occupational stressors scale. Tool (3): Employee work performance scale. Results: More than two-fifth of the studied nurses had severe occupational stress, while more than half of the studied nurses had unsatisfactory level of work performance. Conclusion: There was a negative highly statistically significant correlation between work performance and occupational stressors. Recommendations: Designing a psycho-educational program for nurses and continuous intervention programs in psychiatric hospitals that provide proper information about how to cope with stress
Interleukin-6 Concentration in Maternal Blood as a Sensitive Marker for Impending Preterm Labor and as a Predictor for Early Diagnosis of Bacterial Infection after Premature Rupture of Membranes

Background: Despite numerous recent developments in an evidence-based approach to Premature Rupture of Membranes (PPROM) management, there is no widely accepted set of therapeutic techniques. A model for predicting intra-amniotic inflammatory markers is required to prevent a negative neonatal outcome in pregnant women with PPROM. This model has the potential to enhance pregnancy management and parental counselling for at-risk women. This is supported by the prevalence of bacterial infection in premature birth and its association with intra-amniotic inflammation. Objective: The aim of the current study is to determine whether serum interleukine-6 concentrations predict impeding preterm delivery. Patients and methods: This case control study included women with a singleton pregnancy, who were admitted to Maternity Hospital and diagnosed with PROM at gestational age from 24 week to 36 weeks. Participants were divided into Control Group consisted of 30 women who had at least one normal pregnancy without history of PROM, abortion, still birth, or preterm delivery and Study Group consisted of 30 women at high risk of preterm labor with history of at least one preterm labor or mid-trimester abortion. IL-6 was measured in studied groups. Results: For diagnosis of preterm labor (PTL), the best cutoff point of IL-6 was ≥64.5, with sensitivity 80%, specificity 100% and accuracy 90%. Area under the curve was statistically significant. Conclusion: With strong sensitivity and specificity, maternal blood IL-6 can be utilized as a biomarker to identify impending infection in PPROM patients. This information can also help the doctor modify treatment plans to optimize feto-maternal outcomes.
Mixed Reality Drama Towards Metaverse Technology in Smart Hotels: An Exploratory Study on Egyptian Hotels Evidence from Guests' Perspectives

Once hotels use modern technology techniques, they will face different reaction concerns and questions from guests about this modern technology. This research aims to explore the extent of awareness and acceptance of guests in Egyptian hotels and their willingness to experience the Metaverse technology within Egyptian hotels and the challenges they face while using it, To achieve the research aim, an electronic questionnaire was designed and distributed to a random sample of guests in Egyptian hotels, 410 valid responses were received and analyzed by SPSS V.28. The results indicated that Egyptian guests do not have enough information about Metaverse technology to accept the experience of Metaverse technology in the future. This information includes advantages, risks, and to the cost factor of Metaverse technology, Therefore, maybe guests' acceptance and confidence in Metaverse technology is the major obstacles to the marketing process of this modern technology in Egyptian hotels. Based on the results, some recommendations were suggested and directed to artificial intelligence techniques (AIT) professionals, hotel managers, hotels owners and the government and institutions responsible for revitalizing tourism and hotels in Egypt. One of the main recommendations was that Providing the necessary infrastructure for the application of Metaverse technology through the conclusion of many agreements between hotels, government and artificial intelligence companies to properly apply Metaverse technology, providing devices for the application of Metaverse technology.
Metal Nanocluster Formation by Ion Implantation in Silicate Glasses:. Nonlinear Optical Applications

Implantation of metal ions (e.g., silver, copper, gold, lead) in glass substrates leads under certain circumstances to the formation of nanometer-radius colloidal particles in a thin surface layer. These particles exhibit an electron plasmon resonance which depends on the optical constants of the implanted metal and on the refractive index of the glass host. The nonlinear optical properties of such colloids, in particular the enhancement of optical Kerr susceptibility by both dielectric and quantum-confinement effects, suggest that the ion implantation technique may play an important role for the production of all-optical switching devices. A review of the state-of-the-art of the research in this field will be presented from the perspective of the nonlinear optical properties of ion-implanted glasses.
Factorization method and irregular inclusions in electrical impedance tomography

In electrical impedance tomography, one tries to recover the conductivity inside a physical body from boundary measurements of current and voltage. In many practically important situations, the investigated object has known background conductivity but it is contaminated by inhomogeneities. The factorization method of Andreas Kirsch provides a tool for locating such inclusions. Earlier, it was shown that under suitable regularity conditions positive (or negative) inhomogeneities can be characterized by the factorization technique if the conductivity or one of its higher normal derivatives jumps on the boundaries of the inclusions. In this work, we use a monotonicity argument to generalize these results: we show that the factorization method provides a characterization of an open inclusion (modulo its boundary) if each point inside the inhomogeneity has an open neighbourhood where the perturbation of the conductivity is strictly positive (or negative) definite. In particular, we do not assume any regularity of the inclusion boundary or set any conditions on the behaviour of the perturbed conductivity at the inclusion boundary. Our theoretical findings are verified by two-dimensional numerical experiments.
The VSOP 5 GHz AGN Survey I. Compilation and Observations

The VSOP mission is a Japanese-led project to image radio sources with sub-milliarcsec resolution by correlating the signal from the orbiting 8-m telescope, HALCA, with a global array of telescopes. Twenty-five percent of the scientific time of this mission is devoted to a survey of 402 bright, small-diameter extra-galactic radio sources at 5 GHz. The major goals of the VSOP Survey are statistical in nature: to determine the brightness temperature and approximate structure; to provide a source list for use with future space VLBI missions; and to compare radio properties with other data throughout the EM spectrum. This paper describes: the compilation of a complete list of radio sources associated with active galactic nuclei (AGN); the selection of the subsample of sources to be observed with VSOP; the extensive ground resources used for the Survey; the status of the observations as of 2000 July; the data-analysis methods; and several examples of results from the VSOP Survey. More detailed results from the full sample will be given in future papers.
Conceptual Study of Selfie As a New Tool for Brand Marketing

This paper aims to propose a proposition of selfie effectiveness from influencers that impact the attitude and buying intentions. The method is to review of several articles reveals the phenomenon of selfie marketing and the science of exercise to develop a proposition about the effectiveness of selfies concerning forming positive attitudes and purchasing intentions of a brand. The study produced a conceptual framework based on Stimuli-Organism-Response (SOR) as the basis for the development of propositions that explain the relationship between selfie charm and self-congruence, attitudes toward influencers, and attitudes toward brands and purchasing intentions with social interaction as moderation variables of the relationship between those variables. This paper describes selfies taken by non-celebrities as influencers. The implication of this study is an alternative model that conceptualizes selfie charm and social interaction as two variables that influence the process of forming a brand's buying attitudes and intentions, which marketers need to consider in creating marketing strategies. The phenomenon of selfies that occur today has given rise to a new stimulus, namely the charm of selfies and netizen comments that affect consumer activity in the purchase of a brand.