Miracle-dz/UniFAR-FTUs huggingface dataset:
Numerical Analysis and Parametric Study of a 7kW Tubular Permanent Magnet Linear Alternator

Free-Piston Stirling Engines (FPSEs) are known for their easy maintenance, longer lifetimes, high reliability, quiet operation due to no crankshafts, and having fewer seals compared to the traditional Stirling engine. Free-piston systems are popular in the conversion of thermal energy into electrical energy and are compatible with many types of heat sources. This research paper concentrates on the development of a Permanent Magnet Linear Alternator (PMLA) and parametrically analyzing it to predict its limitations and performance over variable operable conditions and material choices. Operable conditions including stroke length and frequency of the translator, and material choice for the stator and magnets, are varied in this study to analyze the machine and put it to test for its extreme limitations. Spacing between slots is introduced to reduce the overall mass of the stator and increase the power density. The load test is carried out with varied parameters. It induces a load EMF of 2.4 kV, yields a power of 7 kW, and has a power density of 314 W/kg by FEM analysis in peak variations. This study enumerates the performance variation of a PMLA over these varied conditions and illustrates the limitations of such power-dense machines.
Enhancement of photoresponse property of perovskite solar cell by aluminium chloride (AlCl3)

The fabrication of a three layer solar cell device is a new area of research. The formation of perovskite phase is evident from x-ray diffraction and its particle size is observed by microstructural analysis. A thin layer of gold coating over the device increases the surface conductivity. Direct contact between a SnCl2 or AlCl3 based perovskite with the gold coating increases the durability of the film but decreases the hole transport properties due to absence of an organic hole transport material. The absorbance spectroscopy analysis gives characteristic peaks showing the evidence of ITO, TiO2 (rutile) and Sn2+ complexes present in the Sn-perovskite film or Al3+ complexes present within the Al-perovskite cell. The desired absorbance near 550 nm due to Al3+ complexes causes a much higher flow of current on illumination and thus is also evidenced by the presence of comparatively high intensity PL spectra in the Al-perovskite system which occurred due to free exciton formation near band edge excitation. The fill factor of the devices is estimated as ∼0.83 and ∼0.65 for Sn-perovskite and Al-perovskite devices respectively. The PCE values of Sn-perovskite and Al-perovskite devices are calculated 0.39% and 0.96% respectively, which establish Al-perovskite film as a useful component for future solar cell device manufacturing.
The positive role of negative emotions in heritage-site visits: the case of Auschwitz Death Camp

ABSTRACT This exploratory qualitative study focuses on two issues: (1) an examination of the emotions that participants expect to feel when visiting a heritage site presenting death and atrocities; and (2) the emotions they feel during the visit. The study is based on 43 semi-structured interviews with participants from Israel, Poland, and Germany. The findings revealed the centrality of negative emotions that emerge at a heritage site, and the co-existence of positive/pleasant and negative/unpleasant emotions such as pride, satisfaction, frustration, sadness, and anger. Additionally, the findings showed the interlinks between the on-site presence, the intensity of the emotional experience, and its memorability. The findings highlight the significant role of negative/unpleasant emotions for the conceptualization of heritage tourism and distinguish it from other types and forms of tourism.
Exploring creativity management of design for additive manufacturing

ABSTRACT While many argue that Additive Manufacturing (AM) opens up new possibilities in design due to its higher degree of design freedom, it is also suggested that it can increase creativity in product design. It has been further proposed that creative outcomes are limited by the imagination of the designer: designers are often asked to take full advantage of the new design potentials given by AM, yet without having the supports that are needed to increase their creativity. Current literature focuses neither on supporting creative perspectives in Design for AM (DfAM) nor on how to manage the higher degree of design freedom that can be present. As a consequence of this noticeable gap in the literature, this paper continue to explore what areas that need to be considered in creativity management, to fully support designers in utilising their creative abilities in relation to AM in design. The paper proceeds through a literature study on creativity in DfAM and presents a case study with experienced designers who are just starting to work with AM in their design practices. This paper contributes to the field with the notion of a creativity layer laid upon DfAM, visualized by three characteristics of creativity (expertise, creative thinking skills and motivation) drawn from previous research. This results in three concrete propositions of areas that need to be considered in future research on how to include a creativity management perspective in DfAM.
High-Efficiency Can Be Achieved for Non-Uniformly Flexible Pitching Hydrofoils via Tailored Collective Interactions

New experiments examine the interactions between a pair of three-dimensional (AR = 2) non-uniformly flexible pitching hydrofoils through force and efficiency measurements. It is discovered that the collective efficiency is improved when the follower foil has a nearly out-of-phase synchronization with the leader and is located directly downstream with an optimal streamwise spacing of X*=0.5. The collective efficiency is further improved when the follower operates with a nominal amplitude of motion that is 36% larger than the leader’s amplitude. A slight degradation in the collective efficiency was measured when the follower was slightly-staggered from the in-line arrangement where direct vortex impingement is expected. Operating at the optimal conditions, the measured collective efficiency and thrust are ηC=62% and CT,C=0.44, which are substantial improvements over the efficiency and thrust of ηC=29% and CT,C=0.16 of two fully-rigid foils in isolation. This demonstrates the promise of achieving high-efficiency with simple purely pitching mechanical systems and paves the way for the design of high-efficiency bio-inspired underwater vehicles.
Predicting International Roughness Index Based on Surface Distresses in Various Climate and Traffic Conditions Using Laser Crack Measurement System

Roughness is one of the most significant parameters in the evaluation of pavement performance. Surface distresses are among the main factors leading to roughness. The collection and evaluation of roughness data require the application of modern equipment such as road surface profilers. In the absence of such equipment, roughness prediction models that are based on surface distresses might provide a desirable assessment of pavement conditions. This research employs the laser crack measurement system (LCMS) to detect and measure surface distresses and roughness along 268 km of primary roads in Iran. Compared with manual survey, LCMS provides maximum detection and measurement accuracy. Based on the LCMS output, distresses with a higher correlation with the International Roughness Index (IRI) were selected as predictors in linear regression models and artificial neural networks (ANN). The models were developed for 10 m and 100 m length sections of the roads under different climate and traffic conditions. The results indicate that the performance of ANN for the 100 m sections with coefficient of determination (R2) of 0.82 is superior to other models. The best case was that of using ANN in 100 m sections for regions with moderate climate and medium traffic levels, with a 0.94 correlation. Satisfactory results in field validation of the models demonstrated that agencies can use other methods of data collection (e.g., manual, right of way [ROW]) to assess the surface distresses and roughness condition of their roads from the developed models with minimum spending and without expensive equipment. Such estimates can be employed to make informed decisions in pavement maintenance programs at the network level.
Small-seeded false flax (Camelina microcarpa) management in Oklahoma winter wheat

Abstract Three herbicide premixes have recently been introduced for weed control in wheat: halauxifen + florasulam, thifensulfuron + fluroxypyr, and bromoxynil + bicyclopyrone. The objective of this study was to evaluate these herbicides along with older products for their control of small-seeded false flax in winter wheat in Oklahoma. Studies took place during the 2017, 2018, and 2020 winter wheat growing seasons. Weed control was visually estimated every 2 wk throughout the growing season, and wheat yield was collected in all 3 yr. Small-seeded false flax diameter was approximately 6 cm at the time of application in all years. Control ranged from 96% to 99% following all treatments with the exception of bicyclopyrone + bromoxynil and dicamba alone, which controlled false flax 90%. All treatments containing an acetolactate synthase (ALS)–inhibiting herbicide achieved adequate control; therefore, resistance is not suspected in this population. Halauxifen + florasulam and thifensulfuron + fluroxypyr effectively controlled small-seeded false flax similarly to other standards recommended for broadleaf weed control in wheat in Oklahoma. Rotational use of these products allows producers flexibility in controlling small-seeded false flax and reduces the potential for development of herbicide resistance in this species. Nomenclature: Bicyclopyrone; bromoxynil; dicamba; florasulam; fluroxypyr; halauxifen; thifensulfuron; small-seeded false flax; Camelina microcarpa Andrz. ex DC. ; wheat; Triticum aestivum L.
A prospective study of peripheral arterial diseases in chronic kidney disease patient attending tertiary care hospital Andhra Pradesh

Background: Around 10% populations worldwide develop chronic kidney disease and two million people require frequent dialysis due to it1. Cardiovascular diseases related complications are more common in chronic kidney patients and responsible for greater morbidity and mortality. This study is designed to determine the peripheral artery disease in patients with chronic kidney disease in our clinical setup and risk factor associated with them.Methods: In present study 140 patients with chronic kidney disease were enrolled for this study. Demographic profile of each patient was recorded. Detailed history of patients regarding claudication was taken. Ankle-brachial index was calculated in each patient with CKD for diagnosis of PAD based on American heart association guideline.Results: There was male predominance. History of smocking was present in 80 (57.14%) patients and absent in 60 (42.85%) patients. Symptom of PAD was present in 28 (20%) patients and absent in 114(80%) patients. Ankle-Brachial Index was positive in 38(27.14%) patients and absent in 102 (72.85%) patients. 80 (57.14%) patients were in stage 3 and 24 (17.14%) patients were in stage 4. Diabetes mellitus was present in 26 (18.57%) patients, Hypertension was present in 64 (45.71%), IHD was present in 22 (15.71%) remaining have no risk factor.Conclusions: From present study we can conclude that PAD was common in CKD patients more than 50 years of age and here is male predominance. It is more common in smoker and in most of the patients it was asymptomatic. Prevalence of PAD was 27.14% in CKD patients. In our study PAD was more common in stage 3 CKD and least common in stage 2, and cardiovascular risk factor was more common in PAD patients then CKD in general.
The Influence of Distributive Justice and Procedural Justice in Job Satisfaction Through Perceived Organizational Supports (Case Study in GOJEK Surabaya)

This research aims to investigate the effect of distributive justice and procedural justice on drivers’ satisfaction. Through perceived organizational support, this research will examine the influence of distributive justice and procedural justice mutualism on drivers’ satisfaction. This study was held in one of online transportation services in Surabaya namely Gojek with 200 respondents. This study applied quantitative method approach. The results show that perceived organizational support feels like mediating relations of distributive justice and procedural justice.
Proximate and Nutritional Composition of Stored Bulb Onions as Affected by Harvest and Postharvest Treatments

Productivity of bulb onions (Allium cepa L.) is largely constrained by postharvest losses. There are several postharvest strategies applicable to onions, but they are mostly applied singularly and therefore their combined effects have not been well studied. This study was set out to evaluate the effects of harvesting stage, curing period, and time of topping on postharvest quality of stored red bulb onions. The study was carried out in Yatta Subcounty, Machakos County, Kenya. The experimental design was split-split plot laid out in a 3 × 3 × 2 factorial arrangement. The treatments consisted of harvesting stage (25%, 50%, and 75% top fall), curing period (none, 1 week, and 2 weeks after harvesting), and time of topping (before and after curing). All the treatments were replicated three times. After 3 months of storage, the bulbs were analyzed for proximate and nutritional composition. Bulbs that were harvested at 75% top fall and cured for one or two weeks before topping retained higher moisture content, bulb weight, crude protein, vitamin C, zinc, potassium, calcium, and iron but lower sodium content after three-month storage. These practices are therefore recommended for maintaining the nutritional quality of bulb onions after harvesting.
Hindcasting Soundscapes before and during the COVID-19 Pandemic in Selected Areas of the North Sea and the Adriatic Sea

The national measures in several European countries during the COVID-19 pandemic also affected offshore human activities, including shipping. In this work, the temporal and spatial variations of shipping sound are calculated for the years before and during the pandemic in selected shallow water test areas from the Southern North Sea and the Adriatic Sea. First, the monthly sound pressure level maps of ships and wind between 2017 and 2020 are calculated for frequencies between 100 Hz to 10 kHz. Next, the monthly changes in these maps are compared. The asymptotic approximation of the hybrid flux-mode propagation model reduces the computational requirements for sound mapping simulations and facilitates the production of a large number of sound maps for different months, depths, frequencies, and ship categories. After the strictest COVID-19 measures were applied in April 2020, the largest decline was observed for the fishing, passenger and recreational ships. Although the changes in the number of fishing vessels are large, their contribution to the soundscape is minor due to their low source level. In both test areas, the spatial exceedance levels and acoustic energies were decreased in 2020 compared to the average of the previous three years.
Effortful control assessed by parental report and laboratory observation and adjustment in early childhood

Effortful control is a key aspect of children’s self-regulation showing a remarkable progress in early childhood. This study explored the relationship between effortful control, externalizing and internalizing problems and prosocial behaviour in young children. The sample was composed by 31 Portuguese children, aged between 3 and 6-years-old, and their parents. Effortful control was assessed by behavioural tasks (Tower of Patience, Bead Sorting) and the very short form of the Child Behavior Questionnaire administered to the parents. Internalizing and externalizing problems, as well as prosocial behaviour, were measured through the Strengths and Difficulties Questionnaire, answered by the parents. The results show that higher levels of effortful control are related to less externalizing problems and higher levels of prosocial behaviour. No significant associations were found between effortful control and internalizing problems. The mechanisms that may explain the different patterns of associations between effortful control and internalizing and externalizing problems in early childhood are discussed.
Assessing the Nutrient Quality of Biofertilizer Produced from Organic Waste Using Lysinibacillus Macroides and Alcaligens Faecalis

Biofertilizers are ecofriendly fertilizers that are produced via degradation of wastes by microorganisms. The efficiency of Lynsibacillus macroides and Alcaligens faecalis in the production of fertilizer from organic wastes was evaluated. The bacterial isolates were isolated from soil samples collected from fallow patch of land in the Rivers State University farm using standard microbiological methods. The test bacteria were identified by conventional and molecular techniques. Organic wastes including cassava peels, elephant grass and poultry droppings used in this study were collected from the Rivers State University Farm. Three experimental treatments were used in this study; treatment 1 contains 300g of the composite substrate without any organisms and served as control, treatment 2 contains 300g of the composite substrate and 200ml of Lynsibacillus macroides while treatment 3 contains 300g of the composite substrate and 200ml of Alcaligenes faecalis. The treatments were allowed to degrade for 10 days. The pH, temperature, nitrogen, phosphorus, potassium and total organic carbon were determined using standard analytical method. Means of physicochemical parameters in treatment 1, 2 and 3, respectively were: pH 8.3±0.7, 8.6±0.4 and 9.0±0.3; Nitrogen: 2.63±0.08, 1.97±0.03 and 1.51±0.01; phosphorus: 4.71±0.01, 4.43±0.01 and 3.52±0.02; potassium: 604.10±2.12, 591.00±1.41421 and 504.20±2.83; total organic carbon: 31.75±0.78, 23.04±0.04 and 17.56±0.01 mg/kg. The treatment which was supplemented with Lysinbacillus macroides produced more nitrogen, phosphorus, potassium and total organic carbon than treatment which was supplemented with A. faecalis. Statistical analysis showed that there was no significant difference (P≤ 0.05) between the quantity of nitrogen produced by L. macroides and A. faecalis. Although the amount of nitrogen produced by both organisms were significantly different from the control. More so, statistical analysis showed that the quantity of phosphorus, potassium and total organic carbon produced by L. macroides was significantly higher (P≤ 0.05) than those produced by A. faecalis and the control. Thus, Lynsibacillus macroides is a better biofertilizer producer than A. faecalis.
Análise florística e estrutural de uma floresta secundária em duas fases sucessionais no Município de Capitão Poço no Nordeste Paraense

O trabalho teve como objetivo analisar as mudanças florísticas e estruturais de uma área com duas fases sucessionais em uma floresta secundária em Capitão Poço - PA. Foram feitas duas medições com intervalo de quatro anos, sendo denominadas de Fase 1 e 2. A área possui 0,36 ha, dividida em 36 subparcelas de 10m x 10m, onde foram registrados todos os indivíduos com DAP ≥ 5 cm, encontrando-se 444 indivíduos distribuídos em 35 espécies, 26 gêneros, 19 famílias com área basal total de 9.266m2/ha e densidade de 1.232,33 árvores/ha (Fase 1) e 518 indivíduos distribuídos em 38 espécies, 28 gêneros, 20 famílias com 11.531m2/ha de área basal e densidade de 1.438,89 árvores/ha (Fase 2). As espécies Vismia guianensis, Guatteria amazonica, Lacistema aggregatum e Banara guianensis foram as mais abundantes e freqüentes. As famílias que apresentaram maior área basal, freqüência e IVI foram Leguminosae, Clusiaceae, Annonaceae, Lauraceae e Melastomataceae (Fase 1 e 2). As famílias Leguminosae e Clusiaceae foram as mais importantes na composição florística e estrutura da área possuindo maiores números de espécies e indivíduos, respectivamente. Portanto, essas famílias devem ter prioridade nos sistemas silviculturais que venham a ser implantados em florestas com as mesmas características da área estudada.
Analysis of Permanent Magnet Motors in High Frequency—A Review

Electric drives consume a great amount of the world’s energy, and it will keep increasing due to the electromobility trend. Thus, the efficiency of electric drives must be improved to reach the desired sustainability goal. The Silicon Carbide devices contribute to this objective due to their high working frequency and lower switching losses. However, working at higher frequencies may bring serious Electromagnetic Compatibility (EMC) problems, as well as insulation stress and higher bearing currents. Hence, it is important to have an electrical machine electrical equivalent circuit model to predict the electromagnetic interference levels. This review summarizes the current state of the art in electrical machine modeling and analysis in high frequency. The main analysis tools as Finite Element Methods, analytic and measurement-based tools are compared in their application on high-frequency electrical machine analysis. Then, different machine high-frequency models are reported, detailing their individual features. Additionally, the influence of the machine design parameters in EMC behavior is outlined for future analysis. All in all, Finite Element analysis is the most accurate tool for high-frequency analysis, provided that mesh size is thinner than the skin depth. It is also concluded that the winding placement is an essential parameter to define the high-frequency behavior of the machine.
Analysis of the Pre and Post-COVID-19 Lockdown Use of Smartphone Apps in Spain

The global pandemic of COVID-19 has changed our daily habits and has undoubtedly affected our smartphone usage time. This paper attempts to characterize the changes in the time of use of smartphones and their applications between the pre-lockdown and post-lockdown periods in Spain, during the first COVID-19 confinement in 2020. This study analyzes data from 1940 participants, which was obtained both from a survey and from a tracking application installed on their smartphones. We propose manifold learning techniques such as clustering, to assess, both in a quantitative and in a qualitative way, the behavioral and social effects and implications of confinement in the Spanish population. We also determine the Big Five personality traits along with addiction, Social Digital Pressure and depression indicators for every group determined by the clustering.
The effect of protein supplement from skin wastes on hematological, biochemical metabolic indices and dairy productivity of highly yielding cows

This study was aimed to establish the effect of a fodder protein supplement from minced subcutaneous epithelium of farm animals on hematological, biochemical parameters of metabolism and milk productivity of high-yielding cows during the early lactation. For this, three groups of cows, six animals each, were formed according to the principle of analogous pairs. The control group received the main diet, the second and third experimental groups were daily fed with 300 g and 500 g of protein supplement for 60 days in addition to the main diet, respectively. The effect of prolongation of the supplement was studied over the next 30 days. Hematological and biochemical blood parameters, qualitative and quantitative composition of milk were studied in all animals. The animals of the experimental groups showed an increase in metabolic and redox processes during the experiment. An increase in the metabolism of nutrients in the liver has been found. Due to the sufficient intake of protein in the organism of animals, there was an increase in milk productivity and milk quality indicators.