Miracle-dz/UniFAR-FTUs huggingface dataset:
Numerical analysis and experimental study on the microvibration of an aerostatic thrust bearing with a pocketed orifice-type restrictor

Large eddy simulation was used to analyze the time-variation flow field in order to study the microvibration of an aerostatic thrust bearing with a pocketed orifice-type restrictor. It was found that the vortex shedding caused air pressure fluctuation, which was directly related to the occurrence of the vibration of the bearing. Furthermore, the influence of bearing parameters on the vibration was studied through numerical analysis and experiments. The results indicated that large eddy simulation could predict the vibration by calculating the air pressure fluctuation inside the bearing. Moreover, the vibration could be reduced if the bearing was featured with a small orifice diameter, a large bearing diameter, a shallow air chamber or a low supply pressure.
The Influence of Organizational Culture, Leadership Style, Financial Compensation, Employee Engagement on Work and Its Impact on the Performance of SMK Inc

The purpose of this study was to determine the effect of organizational culture, leadership style, financial compensation, employee engagement on job satisfaction, and its impact on employee performance at SMK Inc. This research belongs to the type of quantitative research using an Explanatory Survey design to explain the relationship between two or more variables through hypothesis testing. Furthermore, the method used is descriptive and verification. The variables in this study are divided into 1) independent variables, 2) intervening variables, and 3) dependent variables. The data used in this study are primary data and secondary data. The data collection techniques used in this study were field research methods, literature study methods, and variable measurement (using a Likert scale). The data test in this study used discriminant validity tests, reliability tests, and hypothesis testing (t-statistics). Based on the results of data processing, it can be concluded that: 1) Testing the first hypothesis that Organizational Culture, Leadership Style, Financial Compensation have a positive and significant impact on job satisfaction at SMK Inc.; 2) Testing the fourth hypothesis that employee engagement has a positive and insignificant effect on job satisfaction at SMK Inc.; 3) Testing the fifth hypothesis. Organizational culture, Leadership Style, has a positive and significant effect on employee performance at SMK Inc.; 4) Financial compensation, Employee Engagement, Satisfaction has a positive and insignificant effect on employee performance at SMK Inc.; 5) Organizational culture has a positive and significant influence on employee performance through employee satisfaction at SMK Inc.; 6) Leadership style and Employee Engagement have no significant effect on employee performance through Employee Satisfaction at SMK Inc., and 7) Testing the twelfth hypothesis. Financial compensation has a positive and significant effect on employee performance through employee satisfaction at SMK Inc.
Real-time transient stability assessment based on centre-of-inertia estimation from phasor measurement unit records

Several smart grid applications have recently been devised in order to timely perform supervisory functions along with self-healing and adaptive countermeasures based on system-wide analysis, with the ultimate goal of reducing the risks associated with potentially insecure operating conditions. Real-time transient stability assessment (TSA) belongs to this type of applications, which allows deciding and coordinating pertinent corrective control actions depending on the evolution of post-fault rotor-angle deviations. This study presents a novel approach for carrying out real-time TSA based on prediction of area-based centre-of-inertia (COI) referred rotor angles from phasor measurement unit (PMU) measurements. Monte Carlo-based procedures are performed to iteratively evaluate the system transient stability response, considering the operational statistics related to loading condition changes and fault occurrence rates, in order to build a knowledge database for PMU and COI-referred rotor-angles as well as to screen those relevant PMU signals that allows ensuring high observability of slow and fast dynamic phenomena. The database is employed for structuring and training an intelligent COI-referred rotor-angle regressor based on support vector machines [support vector regressor (SVR)] to be used for real-time TSA from selected PMUs. Besides, the SVR is optimally tuned by using the swarm variant of the mean-variance mapping optimisation. The proposal is tested on the IEEE New England 39-bus system. Results demonstrate the feasibility of the methodology in estimating the COI-referred rotor angles, which enables alerting about real-time transient stability threats per system areas, for which a transient stability index is also computed.
Detection of velocity dispersion from the kinetic Sunyaev-Zeldovich effect

Using the Planck full-mission data, we present a detection of the temperature (and therefore velocity) dispersion due to the kinetic Sunyaev-Zeldovich (kSZ) eﬀect from clusters of galaxies. To suppress the primary CMB and instrumental noise we derive a matched ﬁlter and then convolve it with the Planck foreground-cleaned “ 2D-ILC ” maps. By using the Meta Catalogue of X-ray detected Clusters of galaxies (MCXC), we determine the normalized rms dispersion of the temperature ﬂuctuations at the positions of clusters, ﬁnding that this shows excess variance compared with the noise expectation. We then build an unbiased statistical estimator of the signal, determining that the normalized mean temperature dispersion of 1526 clusters caused by the kSZ eﬀect is h (∆ T/T ) 2 i = (1 . 64 ± 0 . 48) × 10 − 11 , which gives a detection at the 3 . 2 σ level. We convert the temperature dispersion of uniform weight into a measurement of the line-of-sight velocity dispersion, by using estimates of the optical depth of each cluster (which introduces additional uncertainty into the estimate). We ﬁnd that the velocity dispersion is h v 2 i = (154 000 ± 72 000) (km s − 1 ) 2 , which is consistent with ﬁndings from other large-scale structure studies, and provides direct evidence of statistical homogeneity on scales of 600 h − 1 Mpc. Our study shows the promise of using cross-correlations of the kSZ eﬀect with large-scale structure in order to constrain the growth of structure.
Extrasolar planet population synthesis

Context. This is the fourth paper in a series showing the results of planet population synthesis calculations. In Paper I, we presented our methods. In Paper II, we compared the synthetic and the observed planetary population statistically. Paper III addressed the influences of the stellar mass on the population. Aims. Our goal in this fourth paper is to systematically study the effects of important disk properties, namely disk metallicity, mass, and lifetime on fundamental properties of planets like mass and semimajor axis. Methods. For a large number of protoplanetary disks that have properties following distributions derived from observations, we calculated a population of planets with our formation model. The model is based on the classical core accretion paradigm but selfconsistently includes planet migration and disk evolution. Results. We find a very large number of correlations. Regarding the planetary initial mass function, metallicity, Mdisk, and τdisk play different roles. For high metallicities, giant planets are more frequent. For high Mdisk, giant planets are more massive. For long τdisk, giant planets are both more frequent and massive. At low metallicities, very massive giant planets cannot form, but otherwise giant planet mass and metallicity are nearly uncorrelated. In contrast, (maximum) planet masses and disk gas masses are correlated. The formation of giant planets is possible for initial planetesimal surface densities ΣS of at least 6 g/cm2 at 5.2 AU. The best spot for giant planet formation is at ∼5 AU. Inand outside this distance, higher ΣS are necessary. Low metallicities can be compensated for by high Mdisk, and vice versa, but not ad infinitum. At low metallicities, giant planets only form outside the ice line, while giant planet formation occurs throughout the disk at high metallicities. The extent of migration increases with Mdisk and τdisk and usually decreases with metallicity. No clear correlation of metallicity and the semimajor axis distribution of giant planets exists because in low-metallicity disks, planets start farther out, but migrate more, while the contrary applies to high metallicities. The final semimajor axis distribution contains an imprint of the ice line. Close-in low mass planets have a lower mean metallicity than hot Jupiters. The frequency of giant planets varies approximately as M1.2 disk and τ 2 disk. Conclusions. The properties of protoplanetary disks – the initial and boundary conditions for planet formation – are decisive for the properties of planets, and leave many imprints on the population.
Attitudes towards self-care in type 2 diabetes mellitus in primary care

Métodos: Estudo descritivo-exploratório, realizado com 18 pessoas com diabetes tipo 2 vinculadas a duas Unidades Básicas de Saúde, que participaram de entrevistas e grupos focais. Os conteúdos textuais foram processados no software IRaMuTeQ. Para avaliar a associação entre as variáveis categóricas, foi utilizado o teste qui-quadrado. Para todas as análises, foi considerado um nível de significância de 5%.
Joint estimation of time and risk preferences using a representative sample of UK households’ subjective perceptions of time

I use real money choices from the Innovation Panel of the UK Household Longitudinal Survey to jointly estimate time and risk preferences via Maximum Likelihood Estimation using different specifications of subjective time. First, a survey-elicited individual estimation of subjective time is utilised. Second, I use two sample-level estimations of subjective time based upon psychophysical laws which have been found to hold for the perception of stimuli such as light and heat, and apply them to the perception of time (To clarify, here, the sample’s average curvature of subjective time is estimated). These specifications are examined closely and compared to that of objective time. Lastly, I also add to the literature on the heterogeneity of time and risk preferences utilising the wide range of variables available. JEL Classification: D81 (Criteria for Decision-Making under Risk and Uncertainty)
Net, Plastic, and Twine-wrapped Large Round Bale Storage Loss

Dry matter loss and quality changes were measured in large round alfalfa hay bales formed in a fixed chamber baler and stored six to nine months in East Lansing, Michigan. Four storage methods were compared: twine-wrapped bales stored in a shed on wooden pallets and twine, plastic, and net-wrapped bales stored outside on pallets. When removed from storage, twine and net-wrapped bales stored outside contained more moisture throughout than bales from the other two storage methods (p < 0.05). Dry matter loss averaged 6.0% in twine-wrapped bales stored inside and 9.6, 16.3, and 16.5% in plastic, net and twine-wrapped bales stored outside, respectively. Increases in neutral detergent fiber, acid detergent fiber, and acid detergent insoluble nitrogen concentrations were higher in the outer [10 cm (4 in.)] layer in net and twine-wrapped bales stored outside than in bales stored inside or wrapped in plastic (p < 0.05). Crude protein concentrations in the outer layer and all forage quality measures from the center of bales were similar across storage methods.
Virtual fitting solution using 3D human modelling and garments

Customers are not able to try-on fashion garments because of the current pandemic, moreover a lot of customers are buying garments online and if there was a feature to virtually try-on garments it would ease the decision-making for customers. This project aims to design a system which will use the user’s 2D image to project a 3D model of the user and fit garments on the generated 3D model by using deep learning techniques. This project presents an integrated approach for virtual try-on systems by using multiple neural networks for different tasks of pose estimation, body segmentation, garment fitting and 3D modelling of the human body. This system is compared and evaluated against the state-of-the-art implementations of virtual try-on systems by using different quantitative and qualitative metrics. This research also provides critical review for the current virtual try-on systems and the optimisations required for improving their performance and accuracy.
Friezes over Z [ √ 2 ] and Z [ √ 3 ]

A frieze on a polygon is a map from the diagonals of the polygon to an integral domain that respects the Ptolemy relation. Motivated by Holm and Jørgensen’s study of friezes from gluing together regular sub-polygons, we study friezes over the integral domain Z[ √ 2] and Z[ √ 3]. The rings Z[ √ 2] and Z[ √ 3] correspond to dissecting a polygon into triangles and squares and into triangles and (regular) hexagons, respectively. This was a generalization of work by Conway and Coxeter, who found that friezes over positive integers on an n-gon are in bijection with triangulations of an n-gon. In particular, we are interested in unitary friezes on a polygon. A frieze is unitary if there exists a triangulation of the underlying polygon such that every arc in the triangulation has a weight in the frieze that is a unit in the respective integral domain. Conway and Coxeter found that all friezes on a polygon over positive integers are unitary. We explore the characterization of unitary friezes on a polygon over Z[ √ 2] and Z[ √ 3]. While in Z[ √ 2] we find a whole family of dissections involving squares and triangles that give rise to a unitary frieze, we claim that in Z[ √ 3] the only unitary friezes come from triangulations i.e. we cannot use a hexagon in the dissection. We also show that the family of dissections giving unitary friezes in Z[ √ 2] has connections to well-known, infinite continued fractions.
Orthogonally stretching parallel plates Flows between orthogonally stretching parallel plates

Navier-Stokes equilibrium solutions of a viscous fluid confined between two infinite parallel plates that can independently stretch or shrink in orthogonal directions are studied. It is assumed that the admissible solutions satisfy spatial self-similarity in the stretching or shrinking perpendicular coordinates. The nonlinear steady boundary-value problem is discretized using a spectral Legendre method, and equilibrium solutions are found and tracked in the two-dimensional parameter space by means of pseudoarclength continuation Newton-Krylov schemes. Different families of solutions have been identified, some of which are two-dimensional and correspond to the classical Wang & Wu self-similar flows arising in a plane channel with one stretching-shrinking wall; C. A. Wang and T. C. Wu, Comput. Math. Applic. , 30, 1-16 (1995). However, a large variety of three-dimensional solutions have also been found, even for low stretching or shrinking rates. When slightly increasing those rates, some of these solutions disappear at saddle-node bifurcations. By contrast, when both plates are simultaneously stretching or shrinking at higher rates, a wide variety of new families of equilibria are created-annihilated in the neighbourhood of cuspidal codimension-2 bifurcation points. This behaviour has similarities with the one observed in other planar and cylindrical self-similar flows.
Rail corrugation: Characteristics, causes, and treatments

Rail corrugation is a phenomenon of great diversity but appears now to be substantially understood. This review proposes some differences in classification of the phenomenon to take account of work undertaken since a widely cited review was published by Grassie and Kalousek in 1993, it attempts to fill holes in an overall understanding of the problem, and answers questions that remained open in 1993 and several that have arisen since. All types of corrugation that have been documented to date are essentially constant-frequency phenomena. By treating the vehicle—track system in its entirety, treatments are proposed that impinge upon track and vehicle design as well as upon the wheel—rail interface where corrugation appears. There is no neat solution to rail corrugation, but it can be treated comprehensively and in many cases also prevented by using products that are already commercially available. Since the frequency of common wavelength-fixing mechanisms varies roughly in the range 50—1200 Hz, trains travelling at different speeds can produce corrugation of substantially similar wavelength by different mechanisms in different locations. Although historical data can no longer be checked, this is the most likely explanation of the belief that rail corrugation was a substantially constant-wavelength phenomenon.
Condition assessment of synthetic insulated cables and accessories operating more than 20 years on the French network

SUMMARY The management of the cable assets in the field is now a main concern of Transmission System Operators (TSO). The French TSO has launched a program in partnership with his main suppliers and with the EDF R&D division to evaluate the ageing of synthetic insulated cables and accessories removed from the field. The cable system technologies and the cable design have evolved since the 60s, with improvements in their performance. The principle applied in France from the beginning of cable system development based on a comprehensive series of qualification tests including a long term test which ensures the performance quality of the system. However, the ageing mechanisms are often more complex than expected and an analysis on cables and accessories operating during more than 20 years was considered as an important step to evaluate the cable system design and its ageing behaviour. To obtain significant data, cable and accessory samples have been randomly picked out and their different components analysed. Physical and chemical properties and electrical performance have been investigated.
Engaging consumers through firm- generated content on Instagram Engagement del consumidor a través del contenido generado por las empresas en instagram

Purpose – The purpose of this paper is to analyse the impact of consumers’ perceptions of the enjoyment and originality of firm-generated content (FGC) posted on Instagram on affective customer engagement (CE). In addition, an examination is undertaken of affective CE as a driver of customer behaviour. Design/methodology/approach – The paper takes a quantitative approach using a sample of 334 women followers of an eco-friendly restaurant Instagram account. After validation of the measurement scales, the hypotheses were tested through structural equation modelling. Drawing on the stimuli-organism-response framework the authors posit that consumers’ perceptions of the enjoyment and originality of Instagram posts generate affective CE, which, in turn, influences customer behaviour. Findings – The results showed that the perceived enjoyment and perceived originality of Instagram posts generated by an eco-friendly restaurant have a positive influence on affective CE, which, in turn, affects consumers’ recommendation behaviours, intention to follow the restaurant’s advice on Instagram and intention to revisit the restaurant. Originality/value – This research provides novel insights into how the perceived enjoyment and originality of FGC posted on Instagram increases women’s affective engagement and expands knowledge of © Estefania Ballester, Carla Ruiz-Mafé and Natalia Rubio. Published in Spanish Journal of Marketing – ESIC. Published by Emerald Publishing Limited. This article is published under the Creative Commons Attribution (CC BY 4.0) licence. Anyone may reproduce, distribute, translate and create derivative works of this article (for both commercial and non-commercial purposes), subject to full attribution to the original publication and authors. The full terms of this licence maybe seen at http://creativecommons.org/licences/ by/4.0/legalcode The authors gratefully acknowledge the financial support of the University of Valencia (Spain) under Grant UV-INV-AE19-1212255. Engaging consumers Received 3 November 2020 Revised 5March 2021 14 June 2021 22 July 2021 Accepted 22 July 2021 Spanish Journal of Marketing ESIC EmeraldPublishingLimited 2444-9709 DOI 10.1108/SJME-11-2020-0189 The current issue and full text archive of this journal is available on Emerald Insight at: https://www.emerald. com/insight/2444-9709.htm
Effect of an image plane on printed circuit board radiation

It is shown that the predominant radiation from a PCB (printed circuit board) with or without an attached cable is the result of common-mode current. For the PCB investigated here, the common-mode current was caused primarily by a source proportional to the signal voltage driving the traces and the cable as an asymmetric dipole antenna. Moreover, the PCB was an effective common-mode antenna even without the cable. The concept of partial inductance was used to calculate the inductance of the ground-return trace. The effect of placing an image plane beneath and close to a PCB was shown. The image plane dramatically reduced the radiated emissions from a PCB even though the plane was not electrically connected to the PCB. The image plane also dramatically reduced the emissions from a PCB with an attached cable when the image plane was correctly connected to the PCB. <<ETX>>
Vestibular and auditory manifestations of migraine

Supplemental Digital Content is available in the text Purpose of review The purpose of this narrative review is to discuss current literature about vestibular migraine and other cochleovestibular symptoms related to migraine. Recent findings Vestibular migraine affects 2.7% of the US population. Misdiagnosis is common. The pathophysiology is currently unknown but new research shows that calcitonin gene-related peptide, which is implicated in migraine headaches, is expressed in the audiovestibular periphery. A recent large-scale placebo-controlled trial looking at metoprolol for vestibular migraine was terminated early due to poor recruitment; however, at study completion, no differences were seen between treatment arms. Many other audiovestibular symptoms have been shown to be associated with migraine, including tinnitus, hearing loss, aural fullness, otalgia, and sinus symptoms. Migraine is also associated with risk for developing numerous otologic conditions, including Meniere's disease, vestibular loss, Benign Paroxysmal Positional Vertigo, and sudden sensorineural hearing loss. There is now some evidence that patients may experience fluctuating hearing loss and aural fullness without vertigo in association with migraine, which is called cochlear migraine. Summary Migraine can cause a variety of audiologic and vestibular symptoms, and further research is required to understand how migraine affects the inner ear.