Miracle-dz/UniFAR-FTUs huggingface dataset:
First Case of COVID-19 N501Y Variant of Concern Infection in a Patient with Chronic HIV Infection

COVID-19 pneumonia continues to have high global prevalence, mortality, and morbidity with the emergence of new variants of concerns due to vaccination inequality. There continues to be limited data on the outcomes of HIV-infected patients with COVID-19. In this report, we present the case of a 62-year old male with chronic HIV who presented with unexplained fever and initial negative COVID-19 PCR, and no radiographic evidence of COVID-19 on chest x-ray or CT Chest. Due to the increased prevalence of COVID-19 and the emergence of variants of concern, diagnostic testing for COVID-19 should be repeated in patients who are persistently febrile despite previous negative swabs and lack of exposure. Patients with immunocompromised states, such as HIV infection, may have atypical clinical presentations, time to PCR positivity, or imaging findings of COVID-19. A thorough investigation for other causes of unexplained fever should also be conducted despite the community prevalence of COVID-19. ResumeLa pneumonie COVID-19 continue d’avoir une prévalence, une mortalité et une morbidité élevées dans le monde, avec l’émergence de nouvelles variantes préoccupantes en raison de l’inégalité de la vaccination. Il existe toujours peu de données sur les résultats des patients infectés par le VIH atteints de COVID-19. Dans ce rapport, nous présentons le cas d’un homme de 62 ans atteint du VIH chronique qui s’est présenté avec une fièvre inexpliquée et une PCR initiale négative pour le COVID-19, et aucune preuve radiographique du COVID-19 sur la radiographie du thorax ou le CT Chest. En raison de l’augmentation de la prévalence du COVID-19 et de l’émergence de variantes préoccupantes, le test de diagnostic du COVID-19 doit être répété chez les patients qui sont constamment fébriles malgré des écouvillons négatifs antérieurs et l’absence d’exposition. Les patients immunodéprimés, tels que les personnes infectées par le VIH, peuvent avoir des présentations cliniques atypiques, un délai de positivité de la PCR ou des résultats d’imagerie du COVID-19. Une recherche approfondie d’autres causes de fièvre inexpliquée doit également être menée malgré la prévalence communautaire du COVID-19.
Problems with reconciling density functional theory calculations with experiment in ferropnictides

First-principles calculations of magnetic and, to a lesser extent, electronic properties of the LaFeAsO-based superconductors show substantial apparent controversy, as opposed to most weakly or strongly correlated materials. Not only do different reports disagree about quantitative values but there is also a schism in terms of interpreting the basic physics of the magnetic interactions in this system. In this paper, we present a systematic analysis using four different first-principles methods and show that while there is an unusual sensitivity to computational details, well-converged full-potential all-electron results are fully consistent among themselves. What makes results so sensitive and the system so different from simple local magnetic moments interacting via basic superexchange mechanisms is the itinerant character of the calculated magnetic ground state, where very soft magnetic moments and long-range interactions are characterized by a particular structure in the reciprocal (as opposed to real) space. Therefore, unravelling the magnetic interactions in their full richness remains a challenging but utterly important task.
CHARACTERIZATION OF OIL SHALE ASHES FORMED AT INDUSTRIAL-SCALE CFBC BOILERS

Combustion conditions in boilers with circulating fluidized bed differ dramatically from those in boilers with firing of pulverized oil shale. To determine the differences in chemical, grain and phase composition of ashes taken from different technological units of boilers, the samples were analyzed using chemical, fractional and quantitative XRD methods. SEM and BET methods were implemented for surface observations and porosity measurements. The comparative physical-chemical and phase characterization of the two above-mentioned kinds of ashes is presented.
Gravitational field of compact objects in general relativity

We study some exact and approximate solutions of Einstein's equations that can be used to describe the gravitational field of astrophysical compact objects in the limiting case of slow rotation and slight deformation. First, we show that none of the standard models obtained by using Fock's method can be used as an interior source for the approximate exterior Kerr solution. We then use Fock's method to derive a generalized interior solution, and also an exterior solution that turns out to be equivalent to the exterior Hartle-Thorne approximate solution that, in turn, is equivalent to an approximate limiting case of the exact Quevedo-Mashhoon solution. As a result we obtain an analytic approximate solution that describes the interior and exterior gravitational field of a slowly rotating and slightly deformed astrophysical object.
Effect of Salicylic Acid on Physicochemical Parameters and Accumulation of Compatible Solutes in Three Genotypes of Cowpea under Arsenic Stress

in Three Abstract Cowpea is a legume widely cultivated across the world but its growth may be limited by contamination with non-essential elements among which are arsenic. The present study was designed to examine the effect of salicylic acid on physicochemical parameters and accumulation of compatible solutes in cowpea under arsenic stress. Three genotypes (Ife brown, ART98-12 and ITOK-568-18) of cowpea seeds were soaked in (0: control, 75 and 150 mg/L) of salicylic acid for 6 hours. They were air-dried and five seeds each were sown in pots of soil containing 0, 250 and 500 mg/L of sodium arsenate. Growth parameters, photosynthetic pigments and compatible solutes were determined. Data were analysed using anova at 5% level of significance. The result shows that in comparing treatment with the control, growth parameters and proline were increased by 4 and 5 folds in Ife brown; 3 and 2 folds in ART 98-12 and 2 and 5 folds in ITOK-568-18,chlorophylls a and b increased by 7.84 ± 0.04 vs. 0.43 ± 0.01 and 5.05 ± 0.03 vs. 0.20 ± 0.01 mg/g/fw in ART98-12; 11.02 ± 0.02 vs. 4.12 ± 0.01 and 7.22 ± 0.01 vs. 1.27 ± 0.02 mg/g/fw in Ife brown; 8.31 ± 0.01 vs. 4.12 ± 0.01 and 5.38 ± 0.01 vs. 1.27 ± 0.02 mg/g/fw in ITOK-568-18, soluble carbohydrate and soluble protein were reduced by 5 and 3 folds, in Ife brown and ITOK-768-18 in 250 mg/L sodium arsenate-treated soil with SA (150 mg/L) but was reduced by 3 folds in 250 mg/L sodium arsenate-treated soil with SA (75 mg/L) for ART98-12. These results show that salicylic acid could alleviate arsenic stress in cowpea and these could be of great value to crop and food producers. physiological parameters and accumulation of compatible solutes in three genotypes of cowpea under arsenic stress.
Leverage, corporate governance, and export intensity of heterogeneous firms: micro-level evidence for Pakistan

ABSTRACT This study attempts to analyse the impact of leverage and corporate governance on export intensity of manufacturing firms quoted on Pakistan stock exchange for period 2013–2019. The results of a two-step system GMM method show that leverage has a negative relationship to export intensity. We find evidence that a firm’s age negatively impacts the export sales to total sales ratio, while profitability has a positive connection with it. Finally, we note that board size exhibits a negative relationship with export intensity. These findings suggest important policy implications for export promotion, specifically for a small-open economy.
X-ray properties of NGC 300 point sources detected with XMM-Newton and their optical counterparts

Studies of the X-ray population of spiral galaxies other tha n our Galaxy are of importance especially for the understanding of X-ray binar ies and other X-ray emitting sources. The X-ray population of spiral galaxies is mai nly composed of supernova remnants (SNRs), low-mass X-ray binaries (LMXBs), hig h-mass X-ray binaries (HMXBs), and other sources for which the nature is still not c lear. The latter are mainly supersoft sources (SSSs), characterized by very sof t spectra and luminosities in the range of 10 36–1039erg s−1, and ultraluminous X-ray sources (ULXs), characterized by a luminosity>1039 erg s−1. In this thesis, I study the X-ray population of the nearby spi ral galaxy NGC 300, using∼66 ksecXMM-Newton data obtained during the observations of 2000 December/ 2001 January. A total of 86 sources inside the D 25 were detected above a maximum likelihood threshold of 10, in the 0.3–6keV band. I deriv d for these sources, global properties as X-ray colors and fluxes. Using optical d ata taken with the 2.2m MPG/ESO telescope, and cross-correlating with the SIMBAD catal ogue of known objects, I attempted to classify the sources, mainly from th e color-color diagram, and compared with other nearby spiral galaxies. I also performe d a deeper analysis of the four brightest sources, for which spectral fitting was possi ble, and show their light curve.
Application of SIMATIC S7-1200 controllers for the water level control system in water reservoirs

The article describes the implementation process of the automatic control system controlling the water level in water reservoirs. The control plant, which is a laboratory model RT-010 by GUNT Hamburg, was described as well as the method of obtaining a parametric mathematical model for simulation purposes. Next, based on the obtained numerical and experimental results, an automatic control system was made consisted of two SIMATIC S7-1200 controllers, the HMI Comfort TP700 panel and SCALANCE X208 communication module. The parametric model was veriﬁed in MATLAB/Simulink, while the TIA Portal software was used to test automatic control system.
Low temperature investigations and surface treatments of colloidal narrowband fluorescent nanodiamonds

We report fluorescence investigations and Raman spectroscopy on colloidal nanodiamonds (NDs) obtained via bead assisted sonic disintegration (BASD) of a polycrystalline chemical vapor deposition film. The BASD NDs contain in situ created silicon vacancy (SiV) centers. Whereas many NDs exhibit emission from SiV ensembles, we also identify NDs featuring predominant emission from a single bright SiV center. We demonstrate oxidation of the NDs in air as a tool to optimize the crystalline quality of the NDs via removing damaged regions resulting in a reduced ensemble linewidth as well as single photon emission with increased purity. We furthermore investigate the temperature dependent zero-phonon-line fine-structure of a bright single SiV center as well as the polarization properties of its emission and absorption.
FILAMENTARY CONDENSATIONS IN A YOUNG CLUSTER

New models are presented for star-forming condensations in clusters. In each model, the condensation mass increases linearly with radius on small scales, and more rapidly on large scales, as in “thermal–nonthermal” models. Spherical condensations with this structure form protostars which match the initial mass function if their infall is subject to equally likely stopping. However, such spherical models do not match the filamentary nature of cluster gas, and they are too extended to form protostars having high mass and short spacing. Two hybrid models are presented, which are spherical on small scales and filamentary on large scales. In and around clusters, cores embedded in linear filaments match the elongation of cluster gas, and the central concentration of low-mass stars. In cluster centers, condensations require a low volume-filling factor to produce massive stars with short spacing. These may have stellate shape, where cores are nodes of filamentary networks, as seen in some simulations of colliding flows and collapsing turbulent clumps. A dense configuration of such stellate condensations may be indistinguishable from a clump forming multiple protostars via filamentary flow paths.
An improved Perturb and Observe Maximum Power Point Tracking Algorithm with the capability of drift avoidance in PV systems

Photovoltaic (PV) systems have become important as they are an environmentally friendly energy source. Maximum Power Point Tracking (MPPT) algorithms are used to improve PV system efficiency. The Perturb and Observe (P&O) algorithm is the most widely used of the MPPT algorithms. The conventional P&O algorithm suffers from drift when the irradiance increases. This occurs when the conventional P&O algorithmic controller is unable to correctly decide the tracking direction due to a change in irradiance. An improved P&O MPPT algorithm is implemented in this paper and its strength is tested for a number of irradiance changes. The improved P&O algorithm is able to more effectively surmount the problem of drift by employing an extra check on the current change before deciding the tracking direction and implementing a variable step size in doing so. Simulations were done with MATLAB/Simulink comparing the conventional and improved P&O algorithms. The results show that the improved P&O was better at avoiding drift.
THE ABSOLUTE AGE OF THE GLOBULAR CLUSTER M15 USING NEAR-INFRARED ADAPTIVE OPTICS IMAGES FROM PISCES/LBT

We present deep near-infrared J, K s ? > photometry of the old, metal-poor Galactic globular cluster M15 obtained with images collected with the LUCI1 and PISCES cameras available at the Large Binocular Telescope (LBT). We show how the use of First Light Adaptive Optics (FLAO) system coupled with the PISCES camera allows us to improve the limiting magnitude by ∼2 mag in K s ? > . By analyzing archival Hubble Space Telescope data, we demonstrate that the quality of the LBT/PISCES color–magnitude diagram is fully comparable with analogous space-based data. The smaller field of view is balanced by the shorter exposure time required to reach a similar photometric limit. We investigated the absolute age of M15 by means of two methods: (i) by determining the age from the position of the main-sequence turnoff (MSTO), and (ii) by the magnitude difference between the MSTO and the well-defined knee detected along the faint portion of the MS. We derive consistent values of the absolute age of M15, that is, 12.9 ± 2.6 Gyr and 13.3 ± 1.1 Gyr, respectively.
Identification of compounds from chufa (Eleocharis dulcis) peels by widely targeted metabolomics

Abstract The Chinese water chestnut (CWC) is among the most widespread and economically important vegetables in Southern China. There are two different types of cultivars for this vegetable, namely, big CWC (BCWC) and small CWC (SCWC). These are used for different purposes based on their metabolic profiles. This study aimed to investigate the metabolite profile of CWC and compare the profiles of peels collected in different harvest years using ultraperformance liquid chromatography/mass spectrometry (UPLC–MS)‐based metabolomics analysis. Three hundred and twenty‐one metabolites were identified, of which 87 flavonoids, 25 phenylpropanoids, and 33 organic acids and derivatives were significantly different in the content of the two varieties of BCWC and SCWC. The metabolite profiles of the two different cultivars were distinguished using principle component analysis (PCA) and orthogonal projections to latent structures discriminant analysis, and the results indicated differences in the metabolite profile of Eleocharis dulcis (Burm. f.) Trin. ex Hensch. Three isomers of hydroxycoumarin, namely, O‐feruloyl‐4‐hydroxycoumarin, O‐feruloyl‐3‐hydroxycoumarin, and O‐feruloyl‐2‐hydroxycoumarin, exhibited increased levels in BCWC, while p‐coumaric acid and vanillic acid did not show any significant differences in their content in BCWC and SCWC peels. This study, for the first time, provides novel insights into the differences among metabolite profiles between BCWC and SCWC.
THE ATACAMA COSMOLOGY TELESCOPE: DYNAMICAL MASSES AND SCALING RELATIONS FOR A SAMPLE OF MASSIVE SUNYAEV–ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTERS

We present the first dynamical mass estimates and scaling relations for a sample of Sunyaev–Zel'dovich effect (SZE) selected galaxy clusters. The sample consists of 16 massive clusters detected with the Atacama Cosmology Telescope (ACT) over a 455 deg2 area of the southern sky. Deep multi-object spectroscopic observations were taken to secure intermediate-resolution (R ∼ 700–800) spectra and redshifts for ≈60 member galaxies on average per cluster. The dynamical masses M200c of the clusters have been calculated using simulation-based scaling relations between velocity dispersion and mass. The sample has a median redshift z = 0.50 and a median mass with a lower limit , consistent with the expectations for the ACT southern sky survey. These masses are compared to the ACT SZE properties of the sample, specifically, the match-filtered central SZE amplitude , the central Compton parameter y0, and the integrated Compton signal Y200c, which we use to derive SZE–mass scaling relations. All SZE estimators correlate with dynamical mass with low intrinsic scatter (≲ 20%), in agreement with numerical simulations. We explore the effects of various systematic effects on these scaling relations, including the correlation between observables and the influence of dynamically disturbed clusters. Using the three-dimensional information available, we divide the sample into relaxed and disturbed clusters and find that ∼50% of the clusters are disturbed. There are hints that disturbed systems might bias the scaling relations, but given the current sample sizes, these differences are not significant; further studies including more clusters are required to assess the impact of these clusters on the scaling relations.
Random and coherent noise attenuation for 2D land seismic reflection line acquired in Iraq

ABSTRACT Noises are common events in seismic reflection data that have very striking features in seismograms, affecting seismic data processing and interpretation. Noise attenuation is an essential phase in seismic processing data, usually resulting in enhancing the signal-to-noise ratio (SNR) and improving the subsurface seismic image. Groundroll presence is a major fashion of significant noise in land seismic surveys. It is a type of coherent noise present in seismograms that appears as linear events, in most cases overlapping the reflections and probably making it challenging to recognise. There are several domains used in noise attenuation techniques. The domain transformations are a complex algorithm used commonly during the processing of seismic data; Therefore, a large number of methods have been developed to attenuate these types of noise to preserve the frequency bandwidth and enhance the SNR of the seismic data. In the time-offset domain, the noise wave such as groundroll and random noises overlap over time; a different domain makes it easier to successfully isolate coherent, random noise and reflection events. We have used effective algorithms in different domains such as (shot, receiver, t-x, f-x, f-k, R-T, and offset class) to attenuate coherent and random noises present in the data. The results indicate that the different domains can reveal features and geological structures that have been masked by the noises present in current data. Because these filtering techniques encourage significant improvements in the final image quality in the 2D seismic section, possibly giving the interpreter an advantage, particularly in structural and stratigraphic interpretation.
Person-centered Maternity Care Among Mothers Who Gave Birth in South Wollo Zone Public Hospitals, Northeastern Ethiopia: A Mixed-method Study

Background: Globally, less attention has been given to the abuse and disrespect observed during maternity care. Person-centered maternity care is providing care that is respectful and responsive to individual women’s preferences and needs and that their values guide all clinical decisions during childbirth. In Ethiopia, person-centered health care is one of the factors that increase client satisfaction and health service utilization. Therefore, we aimed to determine the level of person-centered maternity care among mothers who gave birth in health facilities of South Wollo Zone public hospitals, Northeastern, Ethiopia, 2019 using a mixed-method study. Methods: An institution-based cross-sectional study was conducted using both qualitative and quantitative data collection methods. Three hundred sixty-nine study participants were selected for the quantitative study using simple random sampling. Twelve study participants were selected for the qualitative study using purposive sampling. The quantitative data was coded and entered into Epi data 4.4 version and the analysis was carried out using Statistical Package for Social Sciences version 23. Descriptive statics was presented using tables and figures. Thematic analysis was used for qualitative data and presented with the quantitative result through triangulation. Result: The Percentage mean score of the person-centered maternity care scale of the respondents was 64% of the total expected score. Whereas, the percentage means score sub-scales were 81.9%, for dignity and respect, 56.4% for communication and autonomy and 61.6% for supportive care. Most mothers who participated in an in-depth interview reported that there is not enough bed, delivery coach and bedpan in government hospitals. Conclusion and recommendations: Person-centered maternity care in health facilities of South Wollo Zone public hospitals is low. Therefore, responsible health sectors should work to improve the quality of care through effective communication between clients and providers and a supportive environment is crucial to succeeding in increasing the uptake of high-quality facility-based births.
An Optimized Control Scheme for Solar Energy Tracking Systems

- This paper proposes a Harris Hawks Optimization (HHO) algorithm for an efficient single-axis solar tracking system. The primary goal of the tracking system is to improve the performance of solar energy conversion systems. To achieve this target, the proportional-integral-derivative (PID) controller, optimized by the HHO, is employed for controlling single-axis sun-tracking control systems. The Weighted Goal Attainment Function (WGAF) combines various individual performance indices, namely Integrated-Squared Error (ISE), Integrated-Time-Weighted Absolute Error (ITAE), and Integrated-Absolute Error (IAE). Its impact on the system performance is employed using different weighting factors representing other system priorities. The performance of the proposed control scheme is verified for variable sun positions and load torque. The HHO-PID controller, optimized using the WGAF, is compared with the conventional PID-controller’s overall system performance. The results obtained from HHO-PID, using the WGAF, are compared to those obtained using ISE, IAE, and ITAE. Analysis results have shown that the lowest fitness function level is obtained (0.14076) using the proposed improved fitness function, compared with other individual fitness functions, which are 1.4386, 5.44438, and 0.4214 for ISE, IAE, and ITAE, respectively. Also, results have shown that the proposed improved fitness function has the best rising time (0.085 sec), settling time (0.16 sec), percent steady-state error (0.00061), and percent overshot (0.00227). The simulation findings also validate the proposed scheme and the effectiveness of the HHO-PID controller, tuned by the WGAF. The results show that the proposed tuned controller has a superior performance in terms of robustness and control effects on the setting time, maximum overshoot, and steady-state error.