Miracle-dz/UniFAR-FTUs huggingface dataset:
Industrial 6 kW high-stability single-stage all-fiber laser oscillator based on conventional large mode area ytterbium-doped fiber

We have demonstrated an industrial 6 kW single-stage end-pumped all-fiber laser oscillator based on a conventional large mode area ytterbium-doped fiber (YDF) with 30 μm core diameter and 600 μm inner-cladding diameter. As a result, the fiber oscillator achieved a maximum output power of 6.07 kW at a central wavelength of ∼1080 nm with a slope efficiency of ∼65.8%. The power of Raman Stoke light was 21.6 dB smaller than the signal light at the output power of 6.07 kW. For industrial application, the stimulated Raman scattering effect was further suppressed by employing a 50 μm-core delivery fiber, and no sign of dynamic transverse mode instability comes into view during the whole experiment. The power stability measurement at ∼6 kW operation was carried out for continuous 2 h, and the power fluctuation was within 0.31%. To the best of our knowledge, this is the first detailed demonstration of industrial 6 kW high-stability single-stage all-fiber laser oscillator based on conventional YDF. The results provide a significant guidance for the construction of more than 6 kW output power single-stage end-pumped all-fiber laser systems.
Fortitude in the Face of a Pandemic Mediation Modeling to Characterize Resilience During COVID-19

PurposeThis study evaluated the differential impact of stressors and psychosocial resources on quality-of-life (QOL) outcomes, and investigated whether attitudes, perspectives, and behaviors relevant to wellness protect one from the negative and positive aspects of the coronavirus disease 2019 (COVID) pandemic.MethodsThis cross-sectional study done Spring/Summer 2020 recruited patients and caregivers of people with chronic medical conditions, and a nationally representative comparison sample of United States adults. Linear regression investigated the associations between COVID-specific variables and QOL outcomes, after covariate adjustment. Structural Equation Modeling investigated whether the links between Resilience and COVID-specific variables were mediated by attitudes, perspectives, and behaviors relevant to wellness.ResultsThe sample seemed knowledgeable of and adherent to the practices endorsed by public-health experts. COVID-specific Hardship, Interpersonal Conflict, and Worry were associated with worse QOL outcomes, and Growth, Social Support, and Coping were associated with better. Wellness was the most salient predictor of Resilience, functioning both as a main effect and mediator for COVID-specific predictors. People with lower levels of Worry and/or higher levels of Social Support tended to have better-than-expected daily performance in the face of the pandemic. These two predictors acted in large part through the attitudes, perspectives, and behaviors relevant to Wellness.Conclusion﻿Our findings support the idea that cultivating Wellness by dint of one’s perspective, attitudes, and behaviors can be an important buffer to challenging times during a pandemic. Wellness seems to support resilience in its own right in addition to being a mechanism through which other factors can do so.
Optimal parameter values of PID controller for DC motor based on modified particle swarm optimization with adaptive inertia weight

A significant problem in the control field is the adjustment of PID controller parameters. Because of its high nonlinearity property, control of the DC motor system is difficult and mathematically repetitive. The particle swarm optimization PSO solution is a great optimization technique and a promising approach to address the problem of optimum PID controller results. In this paper, a modified particle swarm optimization PSO method with four inertia weight functions is suggested to find the global optimum parameters of the PID controller for speed and position control of the DC motor. Benchmark studies of inertia weight functions are described. Two scenarios have been suggested in order to modify PSO including the first scenario called M1-PSO and the second scenario called M2-PSO, as well as classical PSO algorithms. For the first scenario, the modification of the PSO was done based on changing the four inertia weight functions, social and personal acceleration coefficient, while in the second scenario, the four inertia weight functions have been changed but the social and personal acceleration coefficient stayed constant during the algorithm implementation. The comparison between the presented scenarios and traditional PID was carried out and satisfied simulation results have shown that the first scenario has rapid search speeds, and very effective and fast implementation compared to the second scenario and classical PSO and even improved PSO technique. Moreover, the proposed approach has a fast searching speed compared to classical PSO. However, it has been found that the classical PSO algorithm has a premature, inaccurate and local convergence process when solving complex optimization issues. The presented algorithm is proposed to increase the search speed of the original PSO.
Study on the Collapse Process of Cavitation Bubbles Including Heat Transfer by Lattice Boltzmann Method

In this study, an improved double distribution function based on the lattice Boltzmann method (LBM) is applied to simulate the evolution of non-isothermal cavitation. The density field and the velocity field are solved by pseudo-potential LBM with multiple relaxation time (MRT), while the temperature field is solved by thermal LBM-MRT. First, the proposed LBM model is verified by the Rayleigh–Plesset equation and D2 (the square of the droplet diameter) law for droplet evaporation. The results show that the simulation by the LBM model is identical to the corresponding analytical solution. Then, the proposed LBM model is applied to study the cavitation bubble growth and collapse in three typical boundaries, namely, an infinite domain, a straight wall and a convex wall. For the case of an infinite domain, the proposed model successfully reproduces the process from the expansion to compression of the cavitation bubble, and an obvious temperature gradient exists at the surface of the bubble. When the bubble collapses near a straight wall, there is no second collapse if the distance between the wall and the bubble is relatively long, and the temperature inside the bubble increases as the distance increases. When the bubble is close to the convex wall, the lower edge of the bubble evolves into a sharp corner during the shrinkage stage. Overall, the present study shows that this improved LBM model can accurately predict the cavitation bubble collapse including heat transfer. Moreover, the interaction between density and temperature fields is included in the LBM model for the first time.
An Ultraperformance LC-MS/MS Method for the Quantification of the Antimalarial Atovaquone in Plasma.

BACKGROUND A primary modality in the treatment and prevention of malaria is the administration of antimalarial agents. Atovaquone (ATQ) has been used in single-drug and multidrug antimalarial applications; however, studies have demonstrated high interindividual drug variability. With the scarcity of analytical methodologies available in the literature, we have developed and optimized a rapid, ultraperformance (UP) LC-MS/MS method for the quantification of ATQ in human plasma. METHODS ATQ was extracted from 25 μL K2-EDTA human plasma via protein precipitation with acetonitrile. Sample solutions were separated on a Synergi 2.5-μm Polar-RP 100A (100 × 2 mm) column. ATQ and its internal standard were detected over 1.3 min on an API 4000 mass analyzer using an electrospray ionization source operated in negative ionization and selected reaction monitoring modes. The method was validated in accordance with the Food and Drug Administration (FDA) Guidance for Industry: Bioanalytical Method Validation recommendations. RESULTS Owing to pharmacokinetic parameters associated with ATQ, 2 calibration curves were generated to quantify the drug across a dynamic concentration range. Two standard curves were established ranging from 250 to 5000 ng/mL and 5000 to 50000 ng/mL, respectively. QC levels for both lower and higher concentration ranges prepared at low (750 ng/mL, 12000 ng/mL), mid (2000 ng/mL, 22500 ng/mL), and high (4250 ng/mL, 42500 ng/mL) concentrations yielded interassay precision ≤9.1% and accuracy ≤±9.4%. Dilutional, stability, and matrix effects studies were also performed, and results were within acceptability limits. CONCLUSIONS This work describes the development and analytical evaluation of a UPLC-MS/MS method for ATQ quantification in plasma. The described method is sufficiently sensitive for ATQ quantification in plasma to support preclinical and clinical trials.
Widening Participation in Medicine: The Impact of Medical Student-Led Conferences for Year 12 Pupils

Purpose Individuals from lower socio-economic backgrounds are under-represented in the medical profession: confidence is a barrier to them successfully applying to medical school. This study examined the impact of two student-led conferences for Year 12 pupils, at which they had the opportunity to present their work. It looked at the ability of the conferences to improve participant confidence, and the feasibility of its replication by other student-led groups. Methods The first, Conference A, had more time and finances invested into it than the second, Conference B. The latter relied solely on university society funding, but utilised WP criteria for selection of participants. Participants identified their confidence in six areas on a ten-point scale, immediately before and after the intervention. Results A paired t-test showed a significant improvement (p < 0.01) in all areas of confidence for both conferences. Cohen’s d showed Conference A had larger effect sizes in five out of six areas than Conference B. Conclusion This intervention has demonstrated a significant positive impact on participant confidence: a key factor to improve their chance of successful admission to medical school. Supporting participants with their presentations prior to the conference was found to further enhance their confidence. The authors feel that this work could be replicated successfully by other student groups.
Can Hydromulch Reduce the Emergence of Perennial Weeds?

Herbicide weed control is difficult in the first years of perennial crop establishment or in minor crops, and plastic sheet mulches can leave persistent residues. Liquid spray-on mulch (hydromulch) might be a solution in these cases. To test three hydromulch formulations on perennial weed emergence, greenhouse assays were conducted for two years in two localities to evaluate their rhizome sprouting and shoot emergence. Data, obtained from a completely randomized block design, were analyzed by means of generalized linear mixed models with binomial distribution and logit link function; the effects of hydromulch, species, and their interaction were considered fixed, while the other sources of variation (i.e., locality, year, block and rhizome length) were considered random. All three hydromulches, based on wheat straw, rice husk, and used substrate for mushroom cultivation, were capable of reducing rhizome sprouting of all four species tested when compared to the non-mulched treatment. Many rhizomes sprouted but were trapped under the mulch layer, especially those of Paspalum dilatatum (87%), Cynodon dactylon, and Sorghum halepense (around 50%), while Cyperus rotundus was least affected by the hydromulch treatments (16%). All three blends showed promising results in the reduction of perennial weed emergence, warranting field trials to test combined weed management strategies.
Effect of foliar fertilization on the chlorophyll content in leaves and the chemical composition of faba bean seeds (Vicia faba L. (Partim))

Foliar fertilization allows supplementation of nutrients during their highest demand by agricultural crops. During the growing period, the state of plant nutrition can be assessed based on the chlorophyll content in leaves, and such analyses can be made using the chlorophyll gauge. The measurement of the so-called leaf greenness index (SPAD) obtained in this way allows determination of the optimal fertilization doses in order to increase or improve the quality characteristics of the yield. A controlled field experiment was conducted at the Experimental Station of Cultivar Assessment in Przecław in 2011 2013. The aim of this study was to estimate the response of two faba bean morphotypes (Amulet and Granit) to foliar fertilization with a multicomponent fertilizer (Basfoliar 6-12-6). The foliar fertilization was applied twice, i.e.: at the budding stage (BBCH 55) and after flowering (BBCH 69). Foliar fertilization did not significantly modify the chlorophyll content in leaves as compared with the control. Intervarietal differences in the SPAD index were not proven either. The mean measurement of the so-called leaf greenness measured at the first flat pod stage (BBCH 70) amounted to 40 SPAD units. Seeds of the cultivar Amulet contained significantly more total protein, ash and fibre but less raw fat than the seeds of the cultivar Grant. Foliar fertilization resulted in a significant increase in raw fat content in the seeds, but only in the cultivar Amulet. The foliar fertilizer increased the content of potassium (K) and zinc (Zn) in seeds. Seeds of the cultivar Amulet as compared with Granit contained significantly more magnesium (Mg), iron (Fe) and manganese (Mn) but less phosphorus (P).
Development of Vernonia amygdalina Leaf Extract Emulsion Formulations in Controlling Gray Mold Disease on Tomato (Lycopersicon esculentum Mill.)

Postharvest fruits including tomatoes are commonly infected by gray mold disease resulting in significant economic losses in the fruit industry. Therefore, this study aimed to develop botanical fungicide derived from Vernonia amygdalina leaf extract to control gray mold on tomato. The emulsion formulation containing surfactant, oil carrier and water was optimized at different non-ionic alkyl polyglucoside surfactants through eleven combinations of oil to surfactant ratio (0:10, 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2, 9:1 and 10:0 w/w). From eight selected formulations, two formulations, F5 and F7 showed stable in storage, remarkable thermodynamic stability, smaller particle size (66.44 and 139.63 nm), highly stable in zeta potential (−32.70 and −31.70 mV), low in polydispersity index (0.41 and 0.40 PdI), low in viscosity (4.20 and 4.37 cP) and low in surface tension (27.62 and 26.41 mN/m) as compared to other formulations. In situ antifungal activity on tomato fruits showed F5 formulation had a fungicidal activity against B. cinerea with zero disease incidence and severity, whereas F7 formulation reduced 62.5% disease incidence compared to a positive control with scale 1. Based on these findings, F5 formulation exhibited pronounced antifungal activity and may contribute to the development of new and safe antifungal product against gray mold on tomato.
Investigating and modelling risk factors for primary postpartum haemorrhage among childbearing Women in the Northern Province of Rwanda: A Case Control Study

Background: The vast majority of maternal deaths occur in Low- and Middle-Income Countries. Postpartum haemorrhage (PPH) remains a major global burden contributing to high maternal mortality and morbidity rates. Assessment of PPH risk factors should be undertaken during antenatal, intrapartum and postpartum periods for timely prevention of maternal morbidity and mortality associated with PPH. The aim of this study is to investigate and model risk factors for primary PPH in Rwanda. Methods: We conducted an observational case-control study of 430 (108 cases: 322 controls) pregnant women with gestational age of 32 weeks and above who gave birth in five selected health facilities of Rwanda between January and June 2020. Poisson regression, a generalized linear model with a log link and a Poisson distribution was used to estimate the risk ratio of factors associated with PPH. The research protocol was approved by the University of Rwanda, College of Medicine and Health Sciences Institutional Ethics Review Board. Results: The overall prevalence of primary PPH was 25.2%. The following risk factors were identified: antepartum haemorrhage (RR=3.36; 95% CI 1.80- 6.26, P<0.001); intrauterine fetal death (RR=1.93; 95% CI 0.93- 4.03, P<0.077); multiple pregnancy (RR=1.83; 95% CI 1.11- 3.01, P=0.016); haemoglobin level <11 gr/dL (RR=1.51; 95% CI 1.00- 2.30, P=0.050), and premature rupture of membranes (RR=0.58; 95% CI 0.32- 1.05, P<0.077). During the intrapartum and immediate postpartum period, the main causes of primary PPH were: uterine atony (RR=6.70; 95% CI 4.78- 9.38, P<0.001), retained tissues (RR= 4.32; 95% CI 2.87- 6.51, P<0.001); and lacerations of genital organs after birth (RR= 2.14; 95% CI 1.49- 3.09, P<0.001). Coagulopathy was not prevalent in primary PPH. Conclusion: Based on our findings, uterine atony remain the foremost cause of primary PPH. As well as other established risk factors for PPH, antepartum haemorrhage and intra uterine fetal death should be included as risk factors in the development and validation of prediction models for PPH. Large scale studies are needed to investigate further potential PPH risk factors.
Influence of stress on the properties of Ge nanocrystals in an SiO2 matrix

In this work, self-assembled Ge quantum dot (QD) formation in a dielectric matrix is explored. Of particular interest were their structural and optical properties, in order to understand the stress build-up in such a process and its impact on the material properties during processing. To this end, thin films consisting of (Ge + SiO2)/SiO2 multilayers grown by RF magnetron sputtering were deposited at room temperature. Annealing of such films at 873 K in inert N2 atmosphere produced, at the position of the Ge-rich SiO2 layers, a high lateral density (about 1012 cm 2) of Ge QDs with a good crystallinity. SiO2 spacer layers separated the adjacent Ge-rich layers, where the Ge QDs were formed with a diameter of about the size of the (Ge + SiO2) as-deposited layer thickness, and created a good vertical repeatability, confirmed by the appearance of a Bragg sheet in two-dimensional small-angle X-ray scattering patterns. The structural analysis, by wide-angle X-ray diffraction, grazingincidence small-angle X-ray scattering and transmission electron microscopy, has shown that the described processing of the films induced large compressive stress on the formed QDs. Optical analysis by time-resolved photoluminescence (PL) revealed that the high density of crystalline Ge QDs embedded in the amorphous SiO2 matrix produced a strong luminescence in the visible part of the spectrum at 2–2.5 eV photon energy. It is shown that the decay dynamics in this energy range are very fast, and therefore the transitions that create such PL are attributed to matrix defects present in the shell surrounding the Ge QD surface (interface region with the matrix). The measured PL peak, though wide at its half-width, when analysed in consecutive short spectral segments showed the same decay dynamics, suggesting the same mechanism of relaxation.
Concurrent Measurements of Soil and Ecosystem Respiration in a Mature Eucalypt Woodland: Advantages, Lessons, and Questions

Understanding seasonal and diurnal dynamics of ecosystem respiration (Reco) in forests is challenging, because Reco can only be measured directly during night‐time by eddy‐covariance flux towers. Reco is the sum of soil respiration (Rsoil) and above‐ground respiration (in theory, RAG = Reco − Rsoil). Rsoil can be measured day and night and can provide a check of consistency on Reco, as the difference in magnitude and time dynamic between Reco and Rsoil should be explained by RAG. We assessed the temporal patterns and climatic drivers of Rsoil and Reco in a mature eucalypt woodland, using continuous measurements (only at night for Reco) at half‐hourly resolution over 4 years (2014–2017). Our data showed large seasonal and diurnal (overnight) variation of Reco, while Rsoil had a low diurnal amplitude and their difference (Reco − Rsoil, or RAG) had a low seasonal amplitude. This result implies at first glance that seasonal variation of Reco was mainly influenced by Rsoil while its diurnal variation was mainly influenced by RAG. However, our analysis suggests that the night‐time Reco decline cannot realistically be explained by a decline of RAG. Chamber measurements of autotrophic components at half‐hourly time resolution are needed to quantify how much of the Reco decline overnight is due to declines in leaf or stem respiration, and how much is due to missing storage or advection, which may create a systematic bias in Reco measurements. Our findings emphasize the need for reconciling bottom‐up (via components measured with chambers) and direct estimates of Reco (via eddy‐covariance method).
The Use of Business Process Management in Hotel Direct Sales Improvement

This article deals with Business Process Modelling and Reengineering use in the hospitality industry, focusing on the improvement of direct telephone sales by application of the CRM system. After modelling the current state of the selected process using ARIS methodology, the same process was remodelled for the application of the CRM system. This application shortened the whole process (mainly the number of activities needed to prosecute) and allowed the front-office employee to be more clients oriented. The automation of labour-intensive processes can reduce the number of human-caused errors and improve the convertibility and reservation request and their overall value.
Where does hybridity originate? Interfacing between local and international actors in Sri Lankan postconflict peacebuilding

ABSTRACT The peace and conflict literature has paid much attention to the hybridity produced by international peacebuilders and local actors. Although the modalities of hybridity have been discussed, few studies related to hybridity have observed the presence of locally led hybrid peacebuilding. To fill this gap in the literature, this paper addresses an emerging form of hybridization that is distinct from the internationally led type by examining the case of Sri Lanka. The paper takes a new direction by investigating the peace practices of local agents, referred to as grama niladharis (GNs), which has caused changes in the behavior of international actors in liberal peacebuilding in Sri Lanka. An anthropological method is applied with in-depth interviews and participatory observation. The paper identifies a critical direction for the discourse by documenting a form of locally led hybridization in which the GN system, with ownership by the local government, incorporates certain liberal peacebuilding concepts. Through this hybridization, local systems appear to reinterpret the liberal peace practices introduced by international peacebuilders in a modified form of peacebuilding and maintain autonomous local operations.