Miracle-dz/UniFAR-FTUs huggingface dataset:
A detailed study of the main sequence of the globular cluster NGC 6397: can we derive constraints on the existence of multiple populations?

Context. Globular clusters can no longer be regarded as examples of “simple stellar populations” as all those so far examined contain an important fraction of “second generation” stars, in which the light elements are processed through the hot CNO cycle, and helium variations may be present. Clusters apparently “simple” contain a majority of second generation stars. Aims. If NGC 6397 contains a large fraction of “second generation” stars (>70% according to recent analysis), the helium abundance of its stars might also be affected, show some star-to-star variation, and be larger than the standard Big Bang abundance Y ∼ 0.24. Can we derive constraints on this issue from the analysis of the main sequence width and from its luminosity function? Methods. We build up new models for the turnoff masses and the main sequence down to the hydrogen burning minimum mass, adopting two versions of an updated equation of state (EOS) including the OPAL EOS. Models consider different initial helium and CNO abundances to cover the range of possible variations between the first and second generation stars. We compare the models with the observational main sequence. We also make simulations of the theoretical luminosity function, for different choices of the mass function and of the mixture of first and second generation stars and compare them with the observed luminosity function by means of the Kolmogorov Smirnov – KS-test. Results. The new models for very low mass stars compare well with previous models and show that the OPAL EOS is a good description in all the region of temperature and densities of very low mass stars for which it is computable. The analysis of the main sequence width shows that any helium variation must be confined within ΔY ∼ 0.02 in the case of a CNO increase as suggested by literature, and we discuss the consequent implications for the model of self-enrichment. We also show that the KS test on the luminosity functions allows us to derive a best distance modulus for each age. For a population all made by stars with standard helium
Different approaches to the second-order Klein–Gordon equation

We derive the Klein–Gordon equation for a single scalar field coupled to gravity at second order in perturbation theory and leading order in slow-roll. This is done in two ways: we derive the Klein–Gordon equation first using the Einstein field equation and then directly from the action after integrating out the constraint equations. We also point out an unexpected result regarding the treatment of the field equations.
STELLAR MASS FUNCTIONS OF GALAXIES AT 4 < z < 7 FROM AN IRAC-SELECTED SAMPLE IN COSMOS/ULTRAVISTA: LIMITS ON THE ABUNDANCE OF VERY MASSIVE GALAXIES

We build a Spitzer IRAC-complete catalog of objects complementing the Ks-band selected UltraVISTA catalog with objects detected in IRAC only. To identify massive ( log ( M * / M ⊙ ) > 11 ? > ) galaxies at 4 < z < 7 ? > , we consider the systematic effects on photometric redshift measurements from the introduction of an old and dusty template and of a bayesian prior on luminosity, as well as the systematic effects from different star formation histories (SFHs) and from nebular emission lines in estimated stellar population properties. Our results are most affected by the luminosity prior, while nebular lines and SFHs marginally increase the measurement dispersion; the samples include 52 to 382 galaxies, depending on the adopted configuration. Using these results we investigate, for the first time, the evolution of the massive end of the stellar mass functions (SMFs) at 4 < z < 7 ? > . Given the rarity of massive galaxies at these redshifts, cosmic variance and Poisson noise dominate the total error budget. The SMFs obtained excluding the luminosity prior show no evolution from z ∼ 6.5 ? > to z ∼ 3.5 ? > , indicating that massive galaxies could already be present at early epochs. The luminosity prior reduces the number of z > 4 ? > massive galaxies by 83%, implying a rapid growth of massive galaxies in the first 1.5 Gyr of cosmic history. The stellar-mass complete sample includes one candidate of a very massive ( log ( M * / M ⊙ ) ∼ 11.5 ? > ), quiescent galaxy at z ∼ 5.4 ? > with MIPS 24 &mgr; m ? > detection, suggesting the presence of an obscured active galactic nucleus. Finally, we show that the observed number of 4 < z < 7 ? > massive galaxies matches the number of massive galaxies at 3 < z < 6 ? > predicted by current galaxy formation models.
Quantum anomalous Hall effect in ferromagnetic transition metal halides

The quantum anomalous Hall (QAH) effect is a novel topological spintronic phenomenon arising from inherent magnetization and spin-orbit coupling. Various theoretical and experimental efforts have been devoted in search of robust intrinsic QAH insulators. However, up to now, it has only been observed in Cr or V doped (Bi,Sb)2Te3 film in experiments with very low working temperature. Based on the successful synthesis of transition metal halides, we use first-principles calculations to predict that RuI3 monolayer is an intrinsic ferromagnetic QAH insulator with a topologically nontrivial global band gap of 11 meV. This topologically nontrivial band gap at the Fermi level is due to its crystal symmetry, thus the QAH effect is robust. Its Curie temperature, estimated to be ~360 K using Monte-Carlo simulation, is above room temperature and higher than most of two-dimensional ferromagnetic thin films. We also discuss the manipulation of its exchange energy and nontrivial band gap by applying in-plane strain. Our work adds a new experimentally feasible member to the QAH insulator family, which is expected to have broad applications in nanoelectronics and spintronics.
Does Environmental Information Disclosure Mediate the Effect of Environmental Cost on Environmental Performance?

Environmental performance is a measure created by the Government to determine the company’s concern for the environment. Environmental costs are sacrifices made by companies to obtain good environmental performance. In addition, companies can disclose information about the activities they have carried out to preserve the environment. The purpose of this study was to determine the effect of environmental costs on environmental performance, mediated by environmental information disclosure. Data were obtained from the annual reports of 12 manufacturing companies in Indonesia, registered from 2015-2019. These companies were selected using purposive sampling. The results indicated that: 1) environmental costs had no effect on environmental performance; 2) environmental costs had a positive and significant effect on disclosure of environmental information; 3) disclosure of environmental information had a positive and significant effect on environmental performance; and 4) disclosure of environmental information mediated the effect of environmental costs on environmental performance. Based on these findings, Indonesian manufacturing companies should increase the quality of their disclosure of environmental information. Keywords: environmental cost, environmental performance, environmental information disclosure
The Interstellar Medium of Gamma-Ray Burst Host Galaxies. I. Echelle Spectra of Swift GRB Afterglows

We present optical echelle spectra of four gamma-ray burst (GRB) afterglows (GRB 050730, GRB 050820, GRB 051111, and GRB 060418) discovered during the first 1.5 yr of operation of the Swift satellite and localized by either the Swift telescope or follow-up ground-based imaging. We analyze the spectra to derive accurate column density measurements for the transitions arising in the interstellar medium (ISM) of the GRB host galaxies. These measurements can be used to constrain the physical properties of the ISM, including the metallicity, dust-to-gas ratio, ionization state, and chemical abundances of the gas. We also present measurements of the strong Mg II systems in the GRB afterglow spectra. With the publication of this paper, we provide the first data release of echelle afterglow spectra by the GRAASP collaboration to the general community.
Emotional Imagery Influences the Adaptive Force in Young Women: Unpleasant Imagery Reduces Instantaneously the Muscular Holding Capacity

The link between emotions and motor function has been known for decades but is still not clarified. The Adaptive Force (AF) describes the neuromuscular capability to adapt to increasing forces and was suggested to be especially vulnerable to interfering inputs. This study investigated the influence of pleasant and unpleasant food imagery on the manually assessed AF of elbow and hip flexors objectified by a handheld device in 12 healthy women. The maximal isometric AF was significantly reduced during unpleasant vs. pleasant imagery and baseline (p < 0.001, dz = 0.98–1.61). During unpleasant imagery, muscle lengthening started at 59.00 ± 22.50% of maximal AF, in contrast to baseline and pleasant imagery, during which the isometric position could be maintained mostly during the entire force increase up to ~97.90 ± 5.00% of maximal AF. Healthy participants showed an immediately impaired holding function triggered by unpleasant imagery, presumably related to negative emotions. Hence, AF seems to be suitable to test instantaneously the effect of emotions on motor function. Since musculoskeletal complaints can result from muscular instability, the findings provide insights into the understanding of the causal chain of linked musculoskeletal pain and mental stress. A case example (current stress vs. positive imagery) suggests that the approach presented in this study might have future implications for psychomotor diagnostics and therapeutics.
On the Feasible Regions Delimiting Natural Human Postures in a Novel Skeletal Representation

The de facto standard for storing human motion data on a computer involves a representation based on Euler angles. This representation, while effective, has several short-comings. Triplets of Euler angles are not unique, and the same posture may be expressed using different combinations of angles. Furthermore, many possible Euler angle triplets correspond to unnatural positions for human joints. This means that, in general, a large part of the representational space remains unused. In this paper, we further investigate a recently proposed representation inspired by molecular representations. It uses only two (instead of three) degrees of freedom per joint: a vector and a torsion angle. Using the two key ingredients of this new representation, we present a complete analysis of the Graphics Lab Motion Capture Database. The data found in this analysis provide us with some powerful insights about natural and unnatural human postures in human motions. These insights can potentially lead to possible constraints on human motions which may be used to more effectively solve open problems in the computer graphics community, most notably the problem of (human) motion adaptation.
EXPRESSION OF BCL-2 AND BAX GENES INDUCED BY AN OVARIAN EXTRACT OF SINGKARAK LAKE PUFFERFISH (Tetraodon leiurus) IN BREAST CANCER CELL

It is known that the ovarian extract of Singkarak Lake Pufferfish (Tetraodon leiurus) has the potential for chemoprevention in MCF-7 cells. However, the expression of Bcl-2 and Bax genes was associated with cancer. Therefore, this study aimed to analyze the Bcl-2 and Bax gene expression induced by the ovarian extract of Singkarak Lake Pufferfish (Tetraodon leiurus) in MCF-7. The method in this study was an in vitro experiment using MCF-7 control cells and MCF-7 cells induced by the ovarian extract of Singkarak Lake Pufferfish (Tetraodon leiurus), and Real-time PCR was used to examine the expression of Bcl-2 and Bax genes. The result showed that the expression of the Bcl-2 gene had an insignificant decrease (p>0.05) by 15%, and the expression of the Bax gene had a significant increase (p<0.05) by 489% compared to the control. These results support that ovarian extract Singkarak Lake Pufferfish (Tetraodon leiurus) can be alternative cancer chemoprevention.
Influence of Temperature and Pressure on the Lattice Constant of SrTiO3 Perovskite by the Statistical Moment Method with Improved Interatomic Potential

Temperature and pressure dependence of lattice constants of a cubic Strontium Titanate (SrTiO3) has been investigated using the statistical moment method. The lattice constants at various temperatures is derived in closed analytic form by including the anharmonic effects of the lattice vibrations explicitly. The potential with the partial charge model and Morse function is used. The numerical lattice constants at high temperatures by the statistical moment method are in good and reasonable agreement with the other theories and the experimental data. Variations of the lattice parameter of SrTiO3 with the temperature are obtained at 1 atm, 8.2 GPa, and 15.2 GPa. Increasing of the lattice constants with increasing temperature is due to enhancing atomic anharmonic fluctuations in SrTiO3 lattice crystal at higher temperature. A decrease of the lattice constants with increasing pressure can be demonstrated by the reduction of atomic vibrations in SrTiO3 crystal lattice at higher pressures.
Systematic review on prevalence and factors associated with breathlessness due to face masks in Asian countries

The usage of face masks has been of abundant and daily wear to every single population steeping high when the COVID-19 pandemic transmits airborne. The masks have been said to cause uneasiness and affect the performance of one’s daily living activities. Therefore, this study aims to identify the prevalence and factors associated with breathlessness due to face masks in Asian countries. Materials and Methods: Two main journal databases were adopted for this review and the study was done based on the PRISMA flow diagram. After being reviewed for stringent inclusion and exclusion criteria, the data was retrieved and compiled. Quality assessment was done using Newcastle-Ottawa Quality Assessment Scale (NOS). Results: ​​​Initial results search accounts for a total of about 800 articles to be reviewed. After eliminating duplication of articles with inclusion and exclusion criteria, we were left with nine articles. Our study shows that there is a high prevalence of breathlessness (26-100%) upon the usage of face masks with types of masks and duration of usage as its factors. Conclusion: Further studies are needed to infer the relationship between the type and duration of face mask usage with breathlessness.
Genetic Characterization of Human Rabies Vaccine Strain in Japan and Rabies Viruses Related to Vaccine Development from 1940s to 1980s

The rabies virus is widely distributed and vaccines are an important strategy to prevent its spread. The whole-genome sequences of rabies strains in relation to vaccine development provide essential information to maintain vaccine quality and develop new vaccines. However, the genetic characteristics of the purified chick embryo cell culture rabies vaccine, KM Biologics (PCECV-KMB), developed in Japan in the 1970s, have not been explored. In this study, we conducted a genome-wide analysis of the open reading frame regions of rabies strains discovered from the 1940s–1980s and used to develop chick embryo cell-adapted HEP-Flury small plaque-forming (CEF-S) strain, which is a vaccine strain of PCECV-KMB. The genetic characteristic of CEF-S, developed by acclimation of the HEP-Flury-NIID strain to one-day eggs and subsequently to chick embryo cells, were confirmed by comparing the genome identity and revealing the nine amino acid mutations between CEF-S and HEP-Flury-NIID. The efficacy of PCECV-KMB was evaluated using attack strains isolated in Thailand in the 1960s–1970s during vaccine development. Phylogenetic analyses of the attack strains classified them in the same Asian clade as the 2000s imported cases from the Philippines to Japan, suggesting that PCECV-KMB is adequate for preventing the spread of the current rabies virus.
Oral Contraceptive Use and Breast Cancer Risk for BRCA1 and BRCA2 Mutation Carriers: Systematic Review and Meta-Analysis of Case–Control Studies

Simple Summary The aim of the present work was to systematically review and meta-analysis the available evidence regarding the effects of oral contraceptives using on breast cancer risk in BRCA germline mutations. The included studies were published between 2002 and 2021. Data were pooled from nine case–control studies, comprising a total of 33,162 woman. The association between oral contraceptive use and risk of breast cancer may differ in breast cancer defined by BRCA mutation status. This meta-analysis showed a diverse effect of oral contraceptive use against breast cancer in BRCA carrier mutations. However, futher case control studies are necessary to examine breast cancer risk. Abstract Oral contraceptive use is one of the major modifiable risk factors for breast cancer. To investigate the effect of oral contraceptive taking on breast cancer risk by BRCA 1 and BRCA 2 mutation status, we conducted a systematic review and meta-analysis of case-controlled studies. Therefore, English language articles were retrieved by searching MEDLINE (PubMed), EMBASE and the Cochrane Library up to August 2021. Data were pooled from none case–control studies, comprising a total of 33,162 subjects, including 23,453 who had never used oral contraceptives. Overall meta-analysis indicated a statistically insignificant risk reduction: OR = 0.86, 95% CI: 0.70 to 1.06, p = 0.1594. However, increased breast cancer risk was associated with age at first use of OCs ≥20 years: OR = 1.21, 95% CI:1.07 to 1.36, p = 0.002. Multivariable meta-regression with covariates of age of first OC use (β = 0.21, 95% CI: −0.25 to 0.67, p = 0.3767), duration of OC use (β = −0.08, 95% CI; −0.51 to 0.34, p = 0.7093), and time since last OC use (β = 0.32, 95% CI: −0.22 to 0.85, p = 0.2461) did not have a significant effect on the breast cancer risk. This meta-analysis suggests a diverse effect of oral contraceptive use against breast cancer in BRCA carrier mutation. The association between OC use and breast and ovarian cancers needs more investigation.
Association of Anxiety and Depression with Objective and Subjective Cognitive Decline in Outpatient Healthcare Consumers with COVID-19: А Cross-Sectional Study

BACKGROUND: In addition to the neurological complications affecting people infected with COVID-19, cognitive impairment symptoms and symptoms of anxiety and depression remain a frequent cause of complaints. The specificity of cognitive impairment in patients with COVID-19 is still poorly understood. AIM: An exploratory study of factors that may be associated with cognitive decline during the COVID-19 pandemic. METHODS: The cross-sectional multicentre observational study was conducted in a polyclinic unit in Saint Petersburg and in the regions of the North-Western Federal Region. During the study, socio-demographic parameters and information about the somatic condition of patients who applied for primary health care was collected. Emotional and cognitive state were investigated using the Hospital Anxiety and Depression Scale (HADS) and Montreal Cognitive Assessment (MoCA). Mathematical and statistical data processing was carried out using SPSS and RStudio statistical programs. RESULTS: The study included 515 participants, 60% (n=310) of which were women. The sample was divided into those who did (28.5%, n=147) and did not (71.4%, n=368) complain of cognitive decline. Patients with complaints of cognitive decline were significantly older, had lower levels of education and higher levels of depression and anxiety according to HADS (p 0.05). Patients with complaints of cognitive decline underwent the MoCA test (24.3%, n=125). The median MoCA test scores were within the normal range (Median=27, Q1=25, Q3=28), and cognitive decline (MoCA less than 26 points) was detected in 40% (n=50) of patients with complaints of cognitive decline. No significant correlations were found between the MoCA scores and the levels of anxiety and depression according to the HADS (p 0.05). Patients with mild severity of the COVID-19 course were more successful with MoCA subtests than patients with moderate and severe courses. CONCLUSION: We found no linear association between objective cognitive deficit and the affective state of respondents. Patients subjective complaints about cognitive dysfunction were mostly caused by their emotional state than an objective decrease of their cognitive functions. Therefore, in case of subjective complaints on cognitive decline, it is necessary to assess not only the cognitive but also the affective state of the patient. The severity of the COVID-19 course affects the functions of the cognitive sphere, including attention, regulatory functions and speech fluency. Mild and moderate severity of the COVID-19 correlates with clinically determined depression. The absence of this relationship with the severe course of the disease is probably explained by the significant somatic decompensation of patients.
The phase diagram of the square lattice bilayer Hubbard model: a variational Monte Carlo study

We investigate the phase diagram of the square lattice bilayer Hubbard model at half-filling with the variational Monte Carlo method for both the magnetic and the paramagnetic case as a function of the interlayer hopping t ⊥ ? > and on-site Coulomb repulsion U. With this study we resolve some discrepancies in previous calculations based on the dynamical mean-field theory, and we are able to determine the nature of the phase transitions between metal, Mott insulator and band insulator. In the magnetic case we find only two phases: an antiferromagnetic Mott insulator at small t ⊥ ? > for any value of U and a band insulator at large t ⊥ ? > . At large U values we approach the Heisenberg limit. The paramagnetic phase diagram shows at small t ⊥ ? > a metal to Mott insulator transition at moderate U values and a Mott to band insulator transition at larger U values. We also observe a re-entrant Mott insulator to metal transition and metal to band insulator transition for increasing t ⊥ ? > in the range of 5.5 t < U < 7.5 t ? > . Finally, we discuss the phase diagrams obtained in relation to findings from previous studies based on different many-body approaches.
A Novel Approach for the Consolidation of Sand by MICP Single Treatment

Saving natural resources has become increasingly important. In construction, research has been done on alternative methods to replace conventional building materials. One of those novel methods is MICP (microbial induced calcium carbonate precipitation). In this process, calcium carbonate crystals are precipitated with the help of ureolytic bacteria. A cementation solution consisting of urea and calcium salt is used. This precipitation can be used for solidification. In the field of MICP research, there exist multiple publications with several kinds of tests, but no verifiable compressive strength test. However, most researchers are concerned with soil improvement or self-healing methods, to fill cracks in concrete. Similarly, column tests are mainly conducted to investigate the strength. This study presents, a new method of strength assay that uses hardened sand samples of 3 cm edge length. This allows for an accurate compressive strength verification and thus the effect of the biocementation treatment. In addition, this method applies a single treatment method with a novel type of formulation of the MICP components. The results show that a single MICP treatment is sufficient for the consolidation of various sands. Compressive strength of up to 1.8 N/mm2 was achieved in the process tests in the uniaxial strength test.