Miracle-dz/UniFAR-FTUs huggingface dataset:
Relaxation dynamics of the metal-semiconductor transition in VO2 thin films

The temperature dependent metal-insulator transition in VO2 films displays substantial hysteresis. This is usually attributed to supercooling or superheating in the grains. In the hysteretic region at fixed temperature there is a relaxation of the resistance toward a presumed equilibrium value. We have made careful measurements of this relaxation, and find that it proceeds with a logarithmic dependence on time. If the transformation is thermally activated in individual grains, the log(t) behavior can be explained either by a wide distribution of activation energies U among grains or a dependence of U on the phase of adjacent grains.
A STUDY ON CUSTOMER RELATIONSHIP AND SATISFACTION WITH RESPECT TO MOBILE SERVICES

: Associations, both private and open, in the present powerful commercial centres are progressively leaving old-fashioned showcasing ways of thinking and methodologies to the reception of more client driven activities that look to comprehend, draw in, hold and manufacture personal long haul association with productive clients. This article dissected consumer loyalty with the administration conveyance of versatile media transmission arranges in India utilizing a parallel calculated relapse model. Essential information was gathered through survey organization. The elements identified with instalments and reserve funds, (for example, offers, leases, and charges) are the most noteworthy in deciding fulfilment, maintenance, and probability of changing starting with one versatile supplier then onto the next. On the other hand, intercommunication factors, (for example, client administration, agreeable representatives, easy to understand sites) were observed to be the least noteworthy. A critical positive relationship was found among fulfilment and maintenance while a poor affiliation was seen between fulfilment/maintenance and dedication.
Estimation of neutron dose contributions to personnel working around high-energy medical linear accelerators for radiation therapy

Purpose: Medical linear accelerators that operate above 10 MeV produce neutrons by photonuclear reactions which present a potential radiation hazard to the personnel. The purpose of this study was to estimate neutron dose contributions to the personnel working with external radiotherapy at Malmo University Hospital (UMAS), compare different kind of neutron detectors/dosimeters, and evaluate how to translate the results of the measurements to an effective dose. By estimating the neutron doses received by the personnel one can decide if better shielding is required.Method: Two accelerators that operate above 10 MeV, Varian Clinac 2100 C/D and Elekta precise, were investigated. Measurements with area monitoring devices (BF3 and 3He based instruments) were performed outside the treatment room (in experimental form), to make a survey of the neutron dose equivalent rate around the radiotherapy facility. Measurements were also performed inside the control rooms when the accelerators were in clinical use (during patient treatment). The personnel were carrying different kind of personal neutron dosemeters (electronic dosemeters, bubble detectors and etched-track detectors) during their time of work. The relation between the operational quantities and the protection quantities were studied.Results and Discussion: It was found that the highest neutron dose rates outside the treatment room when irradiating a phantom with 18 MV photon beams from the Elekta machine, were outside the treatment door (~150 μSv/h), at the hallway between the control rooms (~90 μSv/h), and inside one of the control rooms (~40 μSv/h). Furthermore from this machine, the neutron contribution to the measured dose equivalent rate was higher than the photon component. The estimated neutron dose equivalent varied up to a factor of two and occasionally even more for the different measuring devices. The highest personal dose equivalent from the personal dosemeters was estimated to be in the order of about1 mSv/year. The personal dose equivalent is the most appropriate operational quantity for estimating the effective dose while the ambient dose equivalent is a rough approximation of the effective dose.Conclusions: This study shows that the neutron component from the bunker with the Elekta machine needs to be considered when high-energy photon beams are used. The measure that could be taken in order to reduce the neutron dose to the personnel is to avoid 18 MV treatments in that bunker. Another solution is to build an additional “neutron stopping door” with hydrogen-containing shielding material inside the treatment room that has to be closed during 18 MV treatments.
Fixed task zone chaining: worker coordination and zone design for inexpensive cross-training in serial CONWIP lines

This work introduces a new canonical model of worker cross-training, called a Fixed Task Zone Chain (FTZC), as a special type of zone-based cross-training and develops a methodology to employ it in U-shaped CONstant Work In Process (CONWIP) lines. The FTZC approach is intended to address lines with more stations than workers in environments where extensive cross-training is prohibitive. It incorporates a two-skill chain to cross-train one skill at each end of each zone; however, tasks at the interior of a zone are not cross-trained. A heuristic dynamic control policy is developed that maximizes the line’s throughput given a zone structure. Some useful properties of the optimal policy are provided as a basis for a heuristic control policy that yields high throughput. The performance of an FTZC system is contingent upon the choice of zone structure; therefore, the zone assignment (ZonA) algorithm is created to design the zone structure to achieve high throughput levels. Sufficient conditions which guarantee that the line is balanceable through ZonA are derived. Benchmarking over a test suite supports the effectiveness of the proposed heuristic worker control policy as well as the ZonA algorithm, and its performance is compared with other paradigms.
FEEDBACK LITERACY SCALE: A STUDY OF VALIDATION AND RELIABILITY

The goal of this study is to develop a measurement tool with proven validity and reliability for determining undergraduates’ feedback literacy levels. The study was carried out using the survey model as a quantitative reaearch method. The participants of this research consisted of 735 students enrolled in Sivas Cumhuriyet University Faculty of Education during the 2021-2022 academic year. The pertinent literature was first searched in accordance with the research goal, after which an item pool was created, the items were subjected to expert review, validity and reliability studies were conducted, and finally the scale was given its final form. Data analysis procedures included exploratory factor analysis, confirmatory factor analysis, and reliability coefficient calculations. Following the exploratory factor analysis, a scale of 24 items and four factors was obtained. The scale's factors were referred to as "Appreciation", "Positive attitude", "Awareness towards effective feedback", and "Openness to use feedback". The scale's factor loadings ranged from . 520 to . 812, and the total variance explained was found to be 57.378% as a result of the exploratory factor analysis. The confirmatory factor analysis yielded the following results: X² = 866.53, sd= 246, p= . 00, X² /sd= 3.52, RMSEA= . 080, SRMR= . 069, CFI= . 97, NFI= . 96, NNFI= . 9 7, RFI= . 95, IFI= . 97. The calculated values corresponded to good fit in X² /sd ratio, RMSEA and SRMR whereas values in CFI, NFI, NNFI, RFI, and IFI indices indicated perfect fit. As a result, the four-factor structure of the "Feedback Literacy Scale", consisting of 24 items, was confirmed as a model. The Cronbach’s Alpha reliability coefficient was . 94 for the entire scale, . 88 for the "Appreciation" factor, . 88 for the "Positive attitude" factor, . 84 for the "Awareness towards effective feedback" factor, and . 83 for the “Openness to use feedback”. The "Feedback Literacy Scale" is a valid and reliable scale that measure students' feedback literacy levels.
Test Instruments to Measure Non-Routine Mathematics Problem Solving Ability Grade IV Elementary School Students

Teachers have a very vital role in the availability of quality education. Various classroom practices used in interacting with students play an important role in understanding mathematical concepts and overall performance in mathematics. This study aims to produce a prototype of a valid and reliable mathematical test instrument for fourth grade elementary school students. This research is a development research. Item analysis of the test instrument using the Rasch model includes ten steps of research and development implementation strategy. Research respondents consist of 5 people on the expert test, 28 people on the small-scale test, and 86 people on the large-scale test. Data was collected by using interview, documentation and questionnaire techniques. Analysis conducted through quantitative and qualitative data. This test prototype development instrument produces a complete Mathematics test. The reliability tested includes inter-rater reliability, namely 0.613, Cronbach Alpha reliability for small- scale tests 0.81 and large-scale test results on Cronbach Alpha reliability 0.78. Based on the results of research and discussion, it can be concluded that the mathematical test instrument to measure non- routine problem solving skills developed is valid and reliable. Existing instruments can help teachers to assess the mathematics ability of fourth grade elementary school students.
An exactly solvable model for the graphene transistor in the quantum capacitance limit

We explore the ultimate behavior of the graphene transistor in the quantum capacitance limit. The quantum capacitance formulation allows for an exactly solvable model, and the ideal assumptions provide an upper bound on performance, including peak currents of 1 mA/μm with mobilities as low as 2000 cm2/V s for channel length of 1 μm, as well as linearly increasing transconductance not observed in conventional transistors. A negative differential resistance is predicted under certain conditions, with a maximum peak-to-valley-current ratio of 4. Finally, the effects of oxide scaling are elucidated and the oxide capacitances required for quantum capacitance limited behavior are quantified.
Compressible mixing layer growth rate and turbulence characteristics

Direct numerical simulation databases have been used to study the effect of compressibility on mixing layers. The simulations cover convective Mach numbers from 0.2 to 1.2 and all contain a fully resolved turbulent energy cascade to small spatial scales. Statistical information is extracted from the databases to determine reasons for the reduced growth rate that is observed as the convective Mach number is increased. It is found that the dilatational contribution to dissipation is negligible even when eddy shocklets are observed in the flow. Also pressure-dilatation is not found to be significant. Using an accurate relation between the momentum thickness growth rate and the production of turbulence kinetic energy together with integrated equations for the Reynolds stress tensor it is shown that reduced pressure fluctuations are responsible for the changes in growth rate via the pressure–strain term. A deterministic model for the required pressure fluctuations is given based on the structure of variable-density vortices and the assumption that the limiting eddies are sonic. Simple anisotropy considerations are used to close the averaged equations. Good agreement with turbulence statistics obtained from the simulations is found.
Rationale for the evaluation of renal functional reserve in allogeneic stem cell transplantation candidates: a pilot study

ABSTRACT Background The main purpose of our study was to evaluate the ability of renal functional reserve (RFR) to stratify the risk of acute kidney injury (AKI) occurrence within 100 days of hematopoietic stem cell transplantation (HSCT) and to predict any functional recovery or the onset of chronic kidney disease. A secondary aim was to identify the clinical/laboratory risk factors for the occurrence of AKI. Methods The study design is prospective observational. We enrolled 48 patients with normal basal glomerular filtration rate (bGFR) who underwent allogenic HSCT. A multiparameter assessment and the Renal Functional Reserve Test (RFR-T) using an oral protein load stress test were performed 15 days before the HSCT. Results Different RFRs corresponded to the same bGFR values. Of 48 patients, 29 (60%) developed AKI. Comparing the AKI group with the group that did not develop AKI, no statistically significant difference emerged in any characteristic related to demographic, clinical or multiparameter assessment variables except for the estimated GFR (eGFR). eGFR ≤100 mL/min/1.73 m2 was significantly related to the risk of developing AKI (Fisher’s exact test, P = .001). Moreover, RFR-T was lower in AKI+ patients vs AKI– patients, but did not allow statistical significance (28% vs 40%). In AKI patients, RFR >20% was associated with complete functional recovery (one-sided Fisher’s exact test, P = .041). The risk of failure to recover increases significantly when RFR ≤20% (odds ratio = 5.50, 95% confidence interval = 1.06–28.4). Conclusion RFR identifies subclinical functional deterioration conditions essential for post-AKI recovery. In our cohort of patients with no kidney disease (NKD), the degree of pre-HSCT eGFR is associated with AKI risk, and a reduction in pre-HSCT RFR above a threshold of 20% is related to complete renal functional recovery post-AKI. Identifying eGFR first and RFR second could help select patients who might benefit from changes in transplant management or early nephrological assessment.
A Systematic Review of Cardiorespiratory Fitness Tests Used in Dance

Dancers need adequate cardiorespiratory fitness (CRF) levels in order to cope with the demands of dance classes and choreographies. Screening and monitoring of CRF is advised. The aim of this systematic review was to provide an overview of tests used to assess CRF in dancers and to examine the measurement properties of these tests. A literature search was performed in three online databases (PubMed, EMBASE, and SPORTDiscus) up until August 16, 2021. Study inclusion criteria were: 1. a CRF test was used; 2. participants were ballet, contemporary or modern, or jazz dancers; and 3. English full-text peer-reviewed article. General study information, participant information, CRF test used, and study outcome were extracted. If available, measurement property data were extracted (i.e., test reliability, validity, responsiveness, and interpretability). Of the 48 articles included in the review, most used a maximal treadmill test (n = 22) or the multistage Dance Specific Aerobic Fitness test (DAFT; n = 11). Out of the 48 included studies, only six examined the measurement properties of CRF tests: Aerobic Power Index (API), Ballet-specific Aerobic Fitness Test (B-DAFT), DAFT, High-Intensity Dance Performance Fitness Test (HIDT), Seifert Assessment of Functional Capactiy for Dancers (SAFD), and the 3-minute step test. Good test-retest reliability was found for the B-DAFT, DAFT, HIDT, and SAFD. Criterion validity was determined for the VO2peak of the API, the 3-MST, HIDT, and SAFD. For HRpeak, criterion validity was studied for the 3-MST, HIDT, and SAFD. While different CRF tests are being used in descriptive and experimental research within dance populations, the body of research supporting the measurement properties of such tests is very small. As many studies have methodological flaws (e.g., small participant numbers or no statistical analysis for validity or reliability), additional good quality research is required to re-examine and complement current measurement property results of the API, B-DAFT, DAFT, HIDT, SAFD, and 3-MST.
${XMM{-}Newton}$ observations of the Seyfert 1 galaxy NGC 3227

We report on an XMM-Newton observation of the Seyfert 1 galaxy NGC 3227 performed in November 2000. The observed X-ray spectrum above 4 keV is well fitted by a hard power law continuum (Γ 1.5) and an absorption edge at 7.6 keV. An Fe K emission line with an equivalent width of 213 eV is detected at 6.4 keV. The line is narrow suggesting contribution from material in low ionization states (<Fe XVII) relatively far from a central black hole. The continuum is strongly absorbed at soft energies by a column of neutral gas (6.5 x 10 2 2 cm - 2 ) larger than previously measured and covering a significant fraction (90%) of the central source. The soft X-ray continuum is also attenuated due to the presence of ionized material (ξ 50-90 erg s - 1 cm) suggesting the presence of a substantial amount of gas (N H 2-9 × 10 2 1 cm - 2 ) in the vicinity (<0.4 pc) of the nucleus. We find that NGC 3227 exhibits significant spectral variability above 2 keV on time scales of a few ksec during the XMM-Newton observations. This short term variability is likely related to variation in the continuum emission. Comparisons with previous observations indicate that variability on timescale of a month also involves a change in the column densities of neutral absorbing material along the line of sight to the nucleus.
The perturbation on initial binding energy for a Majda-CJ combustion model

We investigate the perturbed Riemann problem for a scalar Chapman–Jouguet combustion model – the perturbation on initial binding energy. Under the entropy conditions, we obtain the unique solutions in a neighbourhood of the origin (t > 0) on the (x, t) plane. It is found that, for some cases, the perturbed Riemann solutions are essentially different from the corresponding Riemann solutions. That is, the perturbation may transform a Chapman–Jouguet detonation into a strong detonation or a weak deflagration following a shock wave; a strong detonation into a weak deflagration following a shock wave; a Chapman–Jouguet deflagration into a weak deflagration.
Interactive Effects of Swimming High-Intensity Interval Training and Resveratrol Supplementation Improve Mitochondrial Protein Levels in the Hippocampus of Aged Rats

Mitochondrial dysfunction and increased oxidative stress cause damage to cells which can lead to the aging process and age-related diseases. Antioxidants such as resveratrol and high-intensity exercise can benefit oxidative damage prevention. This study is aimed at evaluating the effects of swimming high-intensity interval training and resveratrol on mitochondrial metabolism key proteins, SIRT5, SOD1, and PDH-E1α, and the level of NAD+ as a cofactor in the deacetylation process in aged rat hippocampus. Forty-five male Wistar rats, aged 20 months, were randomly divided into five groups: control (C), Swimming High-Intensity Interval Training (HIIT) (S-HIIT), Swimming HIIT with resveratrol supplementation (S-HIIT-R), resveratrol supplementation (R), and solvent of resveratrol supplementation (SR). S-HIIT and resveratrol groups performed the exercise and received resveratrol (10 mg/kg/day, gavage) for six weeks. Western blot analysis was performed to determine the protein level in the hippocampus. The amount of SIRT5 and SOD1 proteins in the hippocampus increased. S-HIIT with resveratrol or resveratrol alone increased the PDH-E1α level significantly. The amount of NAD+ was analyzed by assay kit that was reduced in S-HIIT, S-HIIT-R, and SR groups compared to controls. The results showed that resveratrol and S-HIIT attenuated the age-related brain changes by increasing the expression of SOD1 and SIRT5 and reducing the level of NAD+ in the hippocampus. Considering these findings, S-HIIT and resveratrol supplementation could be proposed as strategies to attenuate age-related brain changes. Resveratrol alone and exercise through the regulation of crucial proteins and cofactors can influence mitochondrial metabolism and oxidative stress in the hippocampus of aged rats.
A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model

We develop and test a model, EPED1.6, for the H-mode pedestal height and width based upon two fundamental and calculable constraints: (1) onset of non-local peeling–ballooning modes at low to intermediate mode number, (2) onset of nearly local kinetic ballooning modes at high mode number. Calculation of these two constraints allows a unique, predictive determination of both pedestal height and width. The present version of the model is first principles, in that no parameters are fit to observations, and includes important non-ideal effects. Extensive successful comparisons with existing experiments on multiple tokamaks, including experiments where predictions were made prior to the experiment, are presented, and predictions for ITER are discussed.
On the relation between specific star formation rate and metallicity

In this paper we present an exact general analytic expression $Z(sSFR)=y/\Lambda(sSFR)+I(sSFR)$ linking the gas metallicity Z to the specific star formation rate (sSFR), that validates and extends the approximate relation put forward by Lilly et al. (2013, L13), where $y$ is the yield per stellar generation, $\Lambda(sSFR)$ is the instantaneous ratio between inflow and star formation rate expressed as a function of the sSFR, and $I$ is the integral of the past enrichment history, respectively. We then demonstrate that the instantaneous metallicity of a self-regulating system, such that its sSFR decreases with decreasing redshift, can be well approximated by the first term on the right-hand side in the above formula, which provides an upper bound to the metallicity. The metallicity is well approximated also by the L13 ideal regulator case, which provides a lower bound to the actual metallicity. We compare these approximate analytic formulae to numerical results and infer a discrepancy <0.1 dex in a range of metallicities and almost three orders of magnitude in the sSFR. We explore the consequences of the L13 model on the mass-weighted metallicity in the stellar component of the galaxies. We find that the stellar average metallicity lags 0.1-0.2 dex behind the gas-phase metallicity relation, in agreement with the data. (abridged)