Miracle-dz/UniFAR-FTUs huggingface dataset:
A Search for HAeBe stars in the bar of the Large Magellanic Cloud based on optical variability

We searched the EROS1 database consisting of 80 000 stars in the bar of the Large Magellanic Cloud for blue objects with irregular photometric behavior similar to Galactic Herbig Ae/Be (HAeBe) stars. We found 14 new objects in addition to the discovery of 7 HAeBe candidate stars found in our previous studies. Based on their light curve and colours we classify these new objects also as EROS LMC HAeBe Candidates (ELHCs). The objects are located in an area of enhanced 60m emission, which indicates a star forming region. The stars are concentrated in three areas and the majority of the objects are clustered round the N 120 nebular complex. The light curves are interpreted with a simple model, involving obscuration by an inhomogeneous orbiting circumstellar dust cloud as the dominant cause of the variability. We find that the dust orbiting the stars is at a radial distance in the order of 10 to a few 100 AUs. Most of the objects are "bluer-when-fainter". This is attributed to the presence of a (blue) scattering nebula with a size smaller than the point spread function of the photometric images. The stellar parameters are derived from the photometry. The luminosity of the stars is in the range of 3:4< log(L=L)< 4: 2a nd the colours indicate spectral types O or B. The stars are located in the HR-diagram above the birthline for Galactic stars by about 1 dex in luminosity. The method used to detect the ELHCs stars on optical variability criteria is discussed. We show that our sample of HAeBe candidates in the EROS1 field of view is complete up to V' 16:5 m for the typical amplitude and time scale of the ELHCs.
The Radiation Balance of the Planet Earth from Radiation Measurements of the Satellite Nimbus II.

Abstract The net flux of radiation at the top of the atmosphere and associated quantities (albedo and outgoing longwave radiation) were computed for five successive semimonthly periods from measurements of the radiance of emitted longwave radiation and reflected solar radiation obtained over the entire globe from the satellite Nimbus II during the period 16 May–28 July 1966. The anisotropy of the reflection characteristics of the earth-atmosphere system was considered for the first time with gross empirical models derived from airplane and balloon observations. The global planetary albedo was found to be between 29 and 31%, while the mean planetary temperature ranged between 254 and 255K. Both results deviate from the corresponding values of earlier investigations in such a way as to suggest that in those investigations the cloudiness or its effect on radiative tranfer, especially in the tropics and subtropics, was overestimated. The global averages of the radiation balance indicate a slight deficit of ab.
The instability of uniform viscous flow under rollers and spreaders

When a thin film of viscous fluid is produced by passing it through a small gap between a roller or spreader and a flat plate, it often presents a waved, or ribbed, surface. An analysis is given here in terms of lubrication theory to show why in many cases flow leading to a uniform film is unstable. Account is taken of surface tension which proves to be a stabilizing factor. The most unstable values of the wave-number, n (characterizing the disturbance), are calculated as functions of the dimensionless variable T/μU0, and of the geometry of the system; T is the surface tension, μ the viscosity and U0 a representative velocity of the fluid. For the particular case of a spreader in the form of a wide-angled wedge, these predictions are compared with experimental observations. Agreement is obtained for values of T/μU0 between about 10 and 0.1, but for smaller values of T/μU0 it is clear that other considerations, involving only viscous and pressure forces, determine the nature of the secondary flow.
TECHNOSTRESS IN ENGAGING OPEN AND DISTANCE LEARNING: EXPLORING MALAYSIAN ENGLISH LANGUAGE LECTURERS' LIVED EXPERIENCES

The outbreak of the Covid-19 pandemic has caused a sudden change in the educational landscape globally and shifted traditional face-to-face classes to open distance learning mode. Due to this transition, it is progressively crucial and of great importance to understand the technostress faced by English language lecturers in adopting open distance learning practices. This phenomenological study explores the lived experiences of eleven English language lecturers from three universities in the southern region of Malaysia regarding the technostress faced in open distance learning practice during the pandemic through the lens of Technological Pedagogical Content Knowledge. Fascinatingly, despite the emergency shift to open distance learning, the results have shown that the participants are keen and receptive to the open distance learning deployment. Moreover, due to their Technological Pedagogical Content Knowledge competency, the participants agreed that the technostress experienced is considered manageable and did not affect their work performance. This study's results are hoped to offer insights into understanding the unprecedented phenomenon to ensure positive impacts in tertiary education.
The primary and inverse instabilities of directional viscous fingering

Consider two infinitely long cylinders of different radii with one inside the other but off-centred. The gap between the two cylinders is partially filled with a viscous fluid. As the cylinders rotate with independent velocities U1 and U2, a thin liquid film coats each of their surfaces all the way around except in the region where the viscous fluid completely fills the gap. Interface conditions that connect solutions of averaged equations in the viscous fluid region with solutions in the thin film region are derived. For the two-interface problem analysed here, two types of instabilities occur depending on the amount of viscous fluid between the cylinders. For large fluid volume, the primary supercritical instability occurs when the front interface becomes unstable as the cylinder velocities are increased. For small fluid volume, the back interface passes through the region where the gap width is a minimum to the same side as the front interface. Steady state solutions with straight interface edges exhibit a turning point with respect to the cylinder velocities. The back interface becomes unstable at the turning point; this inverse instability is subcritical.
Influence of Stator Clocking on the Unsteady Three-Dimensional Flow in a Two-Stage Turbine

To give insight into the influence of the clocking and the stator-rotor interaction, the unsteady three-dimensional (3D) flow through a two-stage turbine is simulated numerically, using a time marching Navier-Stokes computer code with a sliding mesh approach. A stator clocking is applied to the second stator vane over several circumferential positions. The numerical results are compared with the experimental one to check the availability of the code. Clocking effects on the turbine performance, wake trajectories, and outlet flow field are focused. A relative efficiency variation of about 0.52% is concluded among clocking positions. A link between the turbine efficiency and the wake trajectories on the midspan is shown based on the presented clocking analysis in the 3D unsteady flow field. The detailed illustration of the outlet flow field shows that the influence of the clocking at the outlet is focused on the temperature distribution.
Thermodynamic aspects of particle engulfment by solidifying melts

This study confirms the predominance of surface thermodynamic effects in the process of particle engulfment by solidifying melts for small‐diameter particles and slow interface motion. Predictions of a thermodynamic model are compared with actual particle engulfment behavior. It turns out that, in complete quantitative agreement with the thermodynamic predictions, the more hydrophobic particles like Teflon are engulfed at even very slow rates of solidification of naphthalene and biphenyl melts. On the other hand, more hydrophilic particles like nylon are rejected, and hence pushed by the solidification front at low and moderate rates of solidification. Conclusive proof of the importance of surface properties in particle engulfing is offered by the investigation of small siliconed glass spheres and untreated glass spheres; again the hydrophobic siliconed glass spheres were engulfed at all solidification rates and the untreated hydrophilic glass spheres were pushed. Rate phenomena for the engulfment of hydr.
Seasonal and interannual variability of an index of deep atmospheric convection over western boundary currents

The seasonal and interannual variability of an index measuring the potential for deep (surface‐to‐tropopause) convection over the extratropical oceans is studied using reanalysis data. It is found that most of the conditional instability is concentrated over the world's western boundary currents during winter, but shifts equatorward of the currents in summer. Conditional instability is only detected over the Gulf Stream and the East Australian Current in their respective summer season.
Potential Impacts of Future Climate Changes on Crop Productivity of Cereals and Legumes in Tamil Nadu, India: A Mid-Century Time Slice Approach

Climate change is a terrible global concern and one of the greatest future threats to societal development as a whole. The accelerating pace of climate change is becoming a major challenge for agricultural production and food security everywhere. The present study uses the midcentury climate derived from the ensemble of 29 general circulation models (GCMs) on a spatial grid to quantify the anticipated climate change impacts on rice, maize, black gram, and red gram productivity over Tamil Nadu state in India under RCP 4.5 and RCP 8.5 scenarios. The future climate projections show an unequivocal increase of annual maximum temperature varying from 0.9 to 2.2°C for RCP 4.5 and 1.4 to 2.7°C in RCP 8.5 scenario by midcentury, centered around 2055 compared to baseline (1981–2020). The projected rise in minimum temperature ranges from 1.0 to 2.2°C with RCP 4.5 and 1.8 to 2.7°C under RCP 8.5 scenario. Among the monsoons, the southwest monsoon (SWM) is expected to be warmer than the northeast monsoon (NEM). Annual rainfall is predicted to increase up to 20% under RCP 4.5 scenario in two-third of the area over Tamil Nadu. Similarly, RCP 8.5 scenario indicates the possibility of an increase in rainfall in the midcentury with higher magnitude than RCP 4.5. Both SWM and NEM seasons are expected to receive higher rainfall during midcentury under RCP 4.5 and RCP 8.5 than the baseline. In the midcentury, climate change is likely to pose a negative impact on the productivity of rice, maize, black gram, and red gram with both RCP 4.5 and RCP 8.5 scenarios in most places of Tamil Nadu. The magnitude of the decline in yield of all four crops would be more with RCP 8.5 over RCP 4.5 scenario in Tamil Nadu. Future climate projections made through multi-climate model ensemble could increase the plausibility of future climate change impact assessment on crop productivity. The adverse effects of climate change on cereal and legume crop productivity entail the potential adaptation options to ensure food security.
Oxygen polarizability in ferroelectric phase transitions

Abstract The polarizability of O2- is investigated by means of a simple electronic model. While in cubic oxides α is proportional to the cell volume V, in anisotropic and covalent materials α≈Vn (where n is between 3 and 4) in compounds such as the ferroelectric perovskites.
Dynamical aspects of correlation corrections in a covalent crystal

A central problem in one-electron band calculations is the proper inclusion of exchange and correlations. We have performed a first-principles calculation by utilizing the Green's-function method with an energy-dependent nonlocal self-energy operator obtained by replacing the Coulomb potential in the exchange operator by a dynamically screened interaction. Diamond was chosen as a prototype of covalent materials. To be consistent with a variety of experimental facts, we have taken the dielectric matrix of the medium within the time-dependent screened Hartree-Fock approximation, thereby including both local-field and electron-hole (excitonic) effects. Previous calculations along similar lines have been restricted either to a random-phase-approximation frequency-independent dielectric function or to a plasmon-pole approximation. We have investigated for the first time the role of a realistic frequency and wave-vector-dependent dielectric matrix, and examined the relative importance of the electron-hole excitations and of the plasma resonance across the range of the valence and conduction bands. The correlated band structure was calculated by diagonalizing the quasiparticle equation of motion in a local orbital basis in order to exploit the local character of both the self-energy operator and the orbitals spanning these bands. We have found that the plasma resonance does not contribute appreciably in the energy range about the band gap while it contributes significantly to the valence bandwidth. Our values of 7.4 eV (band gap) and 25.2 eV (valence band-width) are in good agreement with reflectivity and photoemission experiments. Implications for the local-density and the energy-independent Coulomb-hole plus screened-exchange approximations are discussed. In addition, our method, by utilizing an energy-dependent self-energy, has also enabled us to calculate quasiparticle damping times (specifically, intraband Auger decay rates) that are consistent with photoemission spectra.
Electrical Field Excitation in Non-Uniform Plasma by a Modulated Electron Beam

Excitation of electric fields due to a modulated electron beam in a warm non-uniform plasma is treated for weak beams in warm plasma. It is shown that the maximum electric field magnitude that is reached near the local plasma resonance point depends significantly on the direction of the electron stream motion. In collisional plasma the magnitude of the Langmuir wave that propagates to the subcritical plasma also depends on the direction of the electron stream motion. The motion of the modulated electron stream front results in beatings between oscillations on the modulation frequency and on the local electron plasma frequencies at the initial moment. Later these beatings damp in the supercritical plasma, whereas in the subcritical plasma they are transformed into spatial beatings between the field of the modulated electron stream and the excited Langmuir wave.
An Extension of the Almost Sure Central Limit Theorem for Products of Sums Under Association

We show that if {X n , n ≥ 1} is a strictly stationary positively or negatively associated sequence of positive random variables with , and (d k ) is a positive numerical sequence obeying a condition similar to Kolmogorov's condition for the LIL, then letting we have where , γ = σ/μ the coefficient of variation, F(·) is the distribution function of the random variable , and 𝒩 is a standard normal random variable. This shows that logarithmic means, used traditionally in a.s. central limit theory for products of sums, can be replaced by other means, leading to considerably sharper results.
Linear and nonlinear stability of the Blasius boundary layer

Two new techniques for the study of the linear and nonlinear instability in growing boundary layers are presented. The first technique employs partial differential equations of parabolic type exploiting the slow change of the mean flow, disturbance velocity profiles, wavelengths, and growth rates in the streamwise direction. The second technique solves the Navier–Stokes equation for spatially evolving disturbances using buffer zones adjacent to the inflow and outflow boundaries. Results of both techniques are in excellent agreement. The linear and nonlinear development of Tollmien–Schlichting (TS) waves in the Blasius boundary layer is investigated with both techniques and with a local procedure based on a system of ordinary differential equations. The results are compared with previous work and the effects of non-parallelism and nonlinearly are clarified. The effect of nonparallelism is confirmed to be weak and, consequently, not responsible for the discrepancies between measurements and theoretical results for parallel flow. Experimental uncertainties, the adopted definition of the growth rate, and the transient initial evolution of the TS wave in vibrating-ribbon experiments probably cause the discrepancies. The effect of nonlinearity is consistent with previous weakly nonlinear theories. White nonlinear effects are small near branch I of the neutral curve, they are significant near branch II and delay or event prevent the decay of the wave.
Current-induced effective field in perpendicularly magnetized Ta/CoFeB/MgO wire

The current-induced effective field in perpendicularly magnetized Ta/CoFeB/MgO wire was investigated. A threshold field decrease of 6.4 kOe/mA was observed by measuring the threshold field of Hall resistance versus the magnetic field curve with various bias currents. The decrease was probably caused by the in-plane effective field, mainly due to the Rashba effect. The effective field of the Ta/CoFeB/MgO wire was smaller and opposite in direction compared to that of Pt/Co/AlOx previously reported.
Cloud-Based Machine Learning Application for Predicting Energy Consumption in Automotive Spot Welding

The energy consumption of production processes is increasingly becoming a concern for the industry, driven by the high cost of electricity, the growing concern for the environment and the greenhouse emissions. It is necessary to develop and improve energy efficiency systems, to reduce the ecological footprint and production costs. Thus, in this work, a system is developed capable of extracting and evaluating useful data regarding production metrics and outputs. With the extracted data, machine learning-based models were created to predict the expected energy consumption of an automotive spot welding, proving a clear insight into how the input values can contribute to the energy consumption of each product or machine, but also correlate the real values to the ideal ones and use this information to determine if some process is not working as intended. The method is demonstrated in real-world scenarios with robotic cells that meet Volkswagen and Ford standards. The results are promising, as models can accurately predict the expected consumption from the cells and allow managers to infer problems or optimize schedule decisions based on the energy consumption. Additionally, by the nature of the conceived architecture, there is room to expand and build additional systems upon the currently existing software.
Attractors of asymptotically compact processes and applications to nonlinear partial differential equations

L'attracteur d'une famille a un parametre asymptotiquement compacte d'applications. Les processus generaux et leurs attracteurs. Processus presque periodiques uniformement asymptotiquement compacts. Semi-groupes et processus periodiques. Application aux equations d'evolution abstraites. Applications aux equations aux derivees partielles semi-lineaires
Frequency of Nucleated Red Blood Cells in the Peripheral Blood of ICU-Admitted Patients

Background Nucleated red blood cells (NRBCs) are not normally found in the peripheral blood of normal healthy individuals. The presence of NRBCs on an adult peripheral blood smear indicates that there is an extremely high demand for the bone marrow to manufacture RBCs and that immature red blood cells are being released into the bloodstream. Anemia, myelofibrosis, thalassemia, miliary tuberculosis, malignancies of the bone marrow (myelomas, leukemias, lymphomas), and prolonged hypoxemia are a few possible pathogenic reasons. Critically ill patients who have NRBCs have a high mortality rate and a worse prognosis. Objective: To evaluate the clinical significance of NRBCs in the peripheral blood of critically ill patients admitted to the ICU to find a cut-off to predict mortality. Materials and Methods: A cross-sectional study was carried out over a period of six months September 1, 2020, to March 31, 2021, in Lahore, Pakistan. A total of 800 critically ill patients of both sexes in the age group of 18-70 years were included. Patients younger than 18 years and patients who underwent surgery were excluded. A quantity of 3 ml of whole blood sample in an ethylenediamine tetraacetic acid (EDTA) vial from each patient was run on SYSMEX XN-9000 (Sysmex Corporation, Kobe, Hyogo, Japan) and the results were reviewed on peripheral smears. Results: The incidence of NRBCs in ICU-admitted patients was 62.5% (500/800). The total number of NRBC-positive patients recovering after the treatment was 364 (72.8%). The overall mortality of NRBC-positive patients was 30% (150/500). It was significantly higher (p<0.001) than that of NRBC-negative patients (14%; 44/300). During treatment, the highest mortality rate was seen in patients due to malignancy (100%), followed by sepsis (58.8%). It was observed that the disease pattern and number of NRBCs were significantly different (p<0.001) among all disease groups. However, there was no statistically significant difference in NRBCs on the basis of gender (p >0.05). In our study, a cutoff of NRBCs of 2.50 showed a high risk of mortality with a sensitivity of 91%. Conclusion: The presence of NRBCs may predict mortality in critically ill ICU-admitted patients. Their presence in the blood may be regarded as a marker of severity suggesting a high risk of ICU death.
Principles and Practice of Structural Equation Modeling by Rex B. Kline

Kline has provided an expanded and partially restructured update on his popular introductory structural equation modeling (SEM) textbook. The 13-chapter book is divided into three sections: “Concepts and Tools” (four chapters), “Core Techniques” (six chapters), and “Advanced Techniques, Avoiding Mistakes” (three chapters). Chapters include summaries, recommended reading, and exercises. I first summarize what the book covers and then close with some evaluative comments.
Numerical modeling of solar faculae close to the limb

A numerical simulation was performed to interpret high-resolution spectropolarimetric observations of polar faculae on the Sun. A semi-empirical three-dimensional model of facula structures, controlled by several free parameters, was constructed. It consists of two components, the atmosphere within small-scale magnetic flux tubes and the exterior atmosphere. Multi-ray 1.5D radiative transfer calculations were performed along oblique rays passing through a highly inhomogeneous atmosphere of the simulation box. By the comparison of the properties of the calculated Stokes profiles from the synthetic faculae with the observed properties, a set of free parameters of the model (such as: size, number density of flux tubes, internal temperature stratification and magnetic field strength) was deduced, which satisfies the observational constraints. The hypothesis about solar faculae as a conglomerate of small-scale magnetic flux tubes is verified. The model reproduces all observed properties: the continuum contrast and its center-to-limb variation, the Stokes I and V profiles of Fe I and Fe II lines, the apparent magnetic field strengths, and the displacement towards the limb of the continuum intensity against the line-of-sight magnetograms.