Miracle-dz/UniFAR-FTUs huggingface dataset:
Investigação de Estratégias de Controle Clássico aplicadas a Conversores de Potência do tipo Flyback

Renewable energy resources are best solutions for combat a future global energy crisis. Improving the efficiency of energy generation and storage to reducing the cost of renewable energy are the main goals in future developments of the power electronics technology. To link the energy generation and storage systems and guarantee the output voltage regulation, dc-dc converters are used. Within this topology of converters, an isolated dc-dc1 converter such as textit flyback type stands out, which offers isolation between input and output of conversion. However, the dynamic behavior of these converters causes non-linear effects in the system, due to the switch elements. In this context, this work carries out a study based on linearization around an operational point aiming at regulating the output voltage of the textit flyback converter by using classic control strategies, aiming to mitigate effects of oscillations, ensuring the stability of the system to the desired performance specifications. The simulations were made for a converter operating with an input voltage of 10 V, an output voltage of 12 V, a power of 10 W and a switching frequency of 2 kHz. Resumo: Recursos energéticos renováveis são soluções promissoras para uma futura crise energética global. Melhorar a eficiência da captação de energia e reduzir o custo de energia renovável são os principais objetivos para o desenvolvimento da tecnologia de eletrônica de potência. Para integrar os sistemas de geração e armazenamento de energia e regulação da tensão de sáıda, são utilizados os conversores CC-CC. Dentro desta topologia de conversores, destaca-se o conversor isolado do tipo flyback, o qual oferece isolação entre entrada e sáıda de conversão. Porém, o comportamento dinâmico destes conversores ocasiona efeitos não lineares no sistema, devido aos elementos de chaveamento. Neste âmbito, este trabalho realiza um estudo baseado na linearização em torno de um ponto de operação para regulação da tensão na sáıda de um conversor flyback fazendo uso de estratégias de controle clássico, objetivando mitigar efeitos de oscilações, garantindo a estabilidade do sistema para as especificações de desempenho desejadas. As simulacões foram realizadas para um conversor operando com tensão de entrada de 10 V, tensão de sáıda de 12 V, potência de 10 W e frequência de comutação de 2 kHz.
Sausage Color Measured by Integrating Sphere Reflectance Spectrophotometry When Whole Blood or Blood Cured by Nitrite is Added to Sausages

Color changes of the cut surface were evaluated in sausages where small amounts of blood have been added. Whole blood or blood cured with nitrite and ascorbic acid was added in the range 0–7 kg/100 kg basic recipe. Changes were measured by reflectance spectrophotometry, using an integrating sphere. The results were evaluated using the CIE 1932 and CIE 1976 L*, a*, b* systems. Best evaluation of surfaces was gained by judging the spectra (380-760 nm), i.e. looking for the amount of nitrosoheme formed, and by calculating lightness as well as color, i.e. CIE 1932 AC or better CIE 1976 a* and b*.
In-house characterization of protein powder

X-ray powder diffraction patterns of lysozyme and insulin were recorded on a standard in-house powder diffractometer. The experimental powder diffraction patterns were compared with patterns calculated from Protein Data Bank coordinate data. Good agreement was obtained by including straightforward corrections for background, unit-cell parameters, disordered bulk solvent and geometric factors. In particular the solvent correction was found crucial for a good agreement. A revised Lorentz factor was derived, which gave a minor, but significant, improvement to the fit in the low-angle region. An attempt to include calculated H-atom positions did not improve the overall fit and was abandoned. The method devised was shown to be a quick and convenient tool for distinguishing precipitates and polymorphs of proteins.
Spa tourism in the Slovak Republic

ABSTRACT The article deals with the development of the legal framework governing the financing of spa companies from public funds and of current tax instruments for their support in the Slovak Republic. Natural medical spas using natural healing springs and climatic conditions still have the character of medical facilities. The analysis of secondary data shows the dependence of these companies on domestic clientele and on the system of spa care financing from public health insurance. At the same time, it presents the profile of clients on the basis of the method of payment, i.e. the number of stays covered by public health insurance and stays of self-payers, indications for spa treatment, source markets and age. It points out the fact that in 2009–2019 there was an increase in spa treatment stays, and since 2016, the financing of spa treatment by self-payers has been prevailing.
Pan-cancer Analysis Combining with Experiments Indicates the Sensitivity of Renal Carcinogenesis to DLGAP5 Expression

Background: Discs large-associated protein 5 (DLGAP5), a kinetochore ﬁbers-binding protein, has been found to function as a oncoprotein in many cancers. However, its expression patterns in normal and cancer tissues across pan-cancer, as well as the cell lines, are far from clear. Methods: Data from genotype-tissue expression (GTEx) and The Cancer Genome Atlas (TCGA) was used to analyze the DLGAP5 expression in normal tissues and cancer cell lines, respectively. The analysis of DLGAP5 expression in cancer tissues and adjacent tissues was based on data from a combined TCGA and GTEx. The associations between the expression, prognosis and cancer immune infiltrates in pan-cancer were also investigated based on TCGA and Tumor Immune Estimation Resource (TIMER), respectively. Furthermore, the analysis results of ccRCC was verified using cell lines via RNAi, western blotting, and the cytological analysis.Results: The low expression levels of DLGAP5 were observed in 31 types of common human tissues, including kidney tissue. However, its expression displayed upregulation in all the 21 tested cancer cell lines, of which kidney cancer cell lines showed a minimal upregulation. As predicted, the significant overexpression of DLGAP5 occurred in at least 26 types of common cancer tissues compared with the adjacent normal tissues. Surprisingly, in three types of kidney cancer (KICH, KIRC/ccRCC, KIRP), DLGAP5 exhibited a statistically significant, but minor, overexpression among 26 types of tested cancers. Furthermore, the survival probability of some tested cancers, including kidney cancer, were significantly related to the upregulated expression of DLGAP5. In addition, among 33 types of tested cancers, KIRC/ccRCC, LGG and LIHC showed a significant positive correlation between DLGAP5 expression and immune infiltration levels. DLGAP5 expression level was also significantly positive correlated with clinical TNM stage of ccRCC patients. Regarding ccRCC tissues and the cell lines, upregulation expression of DLGAP5 was also detected. Its knockdown inhibited the cells viability and proliferation, and compromised the cells migration and invasion. Conclusions: DLGAP5 overexpression occurred in common human cancers, including the kidney cancers. Notably, ccRCC, seemed to be particularly sensitive to the expression. DLGAP5, therefore, may be as a robust independent prognostic biomarker in ccRCC diagnosis.
Vision Acuity Index. A Novel Metric to Select the Best Fit Computer Vision Algorithm for Smart Cities and Industry 4.0

Computer vision is considered as an ally to solve business problems that require human 1 intervention, intelligence and criteria. This topic of research has evolved in XXI century at faster peace, 2 delivering various alternatives from open source until commercial platforms. With so many options 3 and market growing, it result difficult to make a decision on which one to use, or even worse, realize 4 it was not suited for different scenarios. In this paper we analyze five options selected arbitrarily and 5 tested on a dataset of 755 images to detect persons in an image, using object detectors. We analyze 6 elapsed time to process an image, error with observations by humans, number of persons detected, 7 correlation of time and person density, object detected size and F1 Score, considering precision and 8 recall. As we found there are score ties and similar behaviors among options available, we introduce 9 a novel index that takes in consideration the number of persons and their pixel size, to propose the 10 Vision Acuity Index of Computer Vision. The results demonstrate this is a good option to serve as 11 indicator to make decisions. Also, this index proposed have a potential to be expanded for different 12 business use cases, and to measure new proposed algorithms in the future along with the traditional 13 metrics used previously. 14
Modification of ethylene acrylic acid film for antimicrobial activity

Benzoyl chloride is commonly used as a food preservative to control microbial contamination by reducing the growth rate and maximum growth population and extending the lag period of the target microorganisms. Benzoyl chloride was successfully incorporated into a matrix of an ethylene acrylic acid polymer. The reaction of benzoyl chloride with ethylene acrylic acid was confirmed by Fourier transform infrared spectroscopy. The antimicrobial activity of modified ionomer films was studied through the monitoring of the growth of Penicillium sp. and Aspergillus sp. on the modified films. An untreated film did not show any inhibition of microbial growth. The inhibition activity was least in an ionomer film treated with acid and benzoyl chloride, and this was followed by a film treated with alkali and benzoyl chloride. The maximum inhibition was observed in a film treated just with benzoyl chloride. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3063–3068 2006
Erliquiose monocitotrópica canina: Revisão

Ehrlichiosis is a disease that affects dogs and can also occur in humans, caused by Ehrlichia spp. , the most diagnosed being Ehrlichia canis, which is a Gram-negative bacterium, transmitted by ticks, mainly Rhipicephalus sanguineous. It is a pandemic, which has its nonspecific clinical signs, and is capable of affecting several organs, being necessary for diagnosis of the physical examination, hematological and serological examination, finding normochromic normocytic anemia, leukopenia and thrombocytopenia regularly.
Electron Spin Resonance Spectroscopic Investigation of the Rotational Motion of Self-Assembled Fatty Acid Films on Al2O3/NiAl(110)

We report on the first electron spin resonance (ESR) investigation of the molecular rotational motion of self-assembled monolayers. We present results on fatty acid films grown on a thin Al2O3 film. The spectra reveal a distinct temperature and coverage dependence. The changes in the line shape with variation of the spin labels location along the alkyl chain allow insight into the internal dynamics of self-assembled films.
COVID-19: Estudo da imunização usando modelo SIR

Este artigo tem como objetivo estudar um modelo SIR com imunização. Um número de reprodução basal sem a estratégia de vacinação é obtido (R0) e outro núumero de reprodução basal com a imunização forcada é proposto, Rv. A existência do ponto de equilbrio endêmico esta condicionada ao Rv > 1 e o ponto de equilbrio livre de doença apresenta uma condição de bifurcação associada a taxa de imunização. A estabilidade local para ambos os pontos é discutida e sua relação com a taxa de imunização é apresentada. Finalmente, simulações numéricas são realizadas para apoiar o resultado.
Effects of Timolol and of Timolol with Tamarind Seed Polysaccharide on Intraocular Pressure in Rabbits

Tamarind seed polysaccharide (TS-P) has high viscosity and mucoadhesive properties which make it a suitable candidate for addition to ophthalmic solutions of β-adrenergic blockers to increase the residence time on the cornea. The effect of an ophthalmic preparation containing timolol and TS-P on intraocular pressure (IOP) was evaluated in rabbits. Ocular administration of 0.5% timolol or 0.5% timolol with 1 and 2% TS-P, into the conjunctival sac had no effect on normal IOP, but significantly reduced betamethasone-induced ocular hypertension, over 20 days. The effect lasted up to 12 h after treatment with timolol + TS-P, and was still present on day 20 of treatment. Timolol in association with TS-P had a prolonged duration of action and is suitable for ocular administration in cases of elevated IOP.
Desenvolvimento e análise de um algoritmo backstepping aplicado a um conversor estático com conexão à rede

This papers presents the analysis and development of a backstepping controller applied to current control of grid-tied converters. A gain design methodology for the proposed backstepping algorithm is presented and an analysis of the impact of the parameter changes is carried out. Therefore, the system design is performed in a simple way, where the selected gains are associated with the required dynamic. Simulation results are presented to demonstrate the effectiveness of the current control method. Resumo: Esse artigo apresenta o desenvolvimento e análise de um algoritmo backstepping aplicado ao controle de corrente de um conversor estático conectado à rede. A análise do sistema proposto é realizada com apresentação de uma metodologia de projeto de ganhos do controlador e verificação do impacto das variações paramétricas. Assim, o projeto do sistema é realizado de uma forma simples, em que a escolha de ganhos é associada à dinâmica requerida. Resultados de simulações são apresentados para validar o método proposto.
Electrical properties of scandium nitride epitaxial films grown on (100) magnesium oxide substrates by molecular beam epitaxy

Scandium nitride (ScN) films were grown on (100) MgO single crystals by a molecular beam epitaxy method. The effects of growth conditions, including [Sc]/[N] ratio, growth temperature, and nitrogen radical state, on the electrical properties of the ScN films were studied. The ScN films comprised many small columnar grains. Hall coefficient measurements confirmed that the ScN films were highly degenerate n-type semiconductors and that the carrier concentration of the ScN films was sensitive to the growth temperature and the nitrogen radical states during the film growth. The carrier concentrations of the ScN films ranged from 1019–1021 cm−3 while the Hall mobilities ranged from 50–130 cm2·V−1·s−1 for undoped films. The temperature-dependent Hall coefficient measurements showed that the carrier concentration is nearly independent of temperature, indicating that the change in resistivity with temperature is explained by a change in the Hall mobility. The temperature-dependence of the Hall mobility was strong.
INVESTIGATION OF DISTINCTIVE SOLUTIONIZING PROCESS PARAMETERS ON SIGNIFICANTLY INCREASING IN STRENGTH AND DUCTILITY OF As-CAST AZ80 Mg ALLOY

A distinctive solutionizing process parameter was developed and performed to significantly enhance strength and ductility of aged AZ80 Mg alloy. The microstructure-processing-properties relationship was studied to help elucidate the mechanism. Microstructure and mechanical properties were studied by using optical microscopy, Field Emission Scanning Electron Microscopy, Transmission Electron Microscopy, X-ray diffraction, hardness and tensile testing. The results show that the solutionization at 380°C/10h followed by 420°C/10h promoted significant dissolution of eutectic Mg17Al12 and intermetallic phases. After standard aging at 200°C/10h, the formation of high-density precipitates Mg17Al12 with more spheroidization precipitates and lesser discontinuous precipitates morphology, which was not observed in conventional heat treatment for aged AZ80 Mg alloy. Fine precipitates Mg17Al12 resulted in a significant increase in ultimate tensile strength (50.3%), yield strength (35%), elongation (106%) and hardness (40%) compared to conventional heat treated cast AZ80 Mg alloy. These properties are comparable to the commonly used aerospace grade cast aluminium alloy A356.
Are Pilot Experiments Random? Social Connections and Policy Expansion in China

Abstract This paper provides new evidence of how political regimes and social connections determine participation in pilot experiments. Using data from China’s national pilot experiments of New Rural Pension Scheme (NRPS), we show that county-level characteristics and political regime have explanation power in the early stage of county pilot decision. Local party secretaries connected to Central Committee (CC) members, a political body that comprises the top leaders of the Communist Party, are discouraged to enroll. In contrast, counties that are send-down movement destinations of CC members during Cultural Revolution (1966-1976) are more likely to enroll. We also find counties with lower cost, higher benefits, and more government revenue are more likely to enroll. Local government leaders may face trade-off between economic performance and social welfare, and connected officials have more incentives to allocate resources in economic growth rather than social welfare. These findings are characterized by a theoretical model that describes how connections change local leaders’ allocation of government resources under a multitask problem
Determination of structural, mechanical, thermal and magnetic properties of Cr based new quaternary Heusler alloys with GGA and GGA+U

Structural, mechanical, thermal and magnetic properties of Quaternary Heusler alloys (QHA) CrFeTiZ (Z = Al, Si, Ge, Ga) are determined by employing full potential - linearized augmented plane wave (FP-LAPW) method using density functional theory (DFT). Geometry optimization of all these QHAs is accomplished and Type 2 is found the most stable. Elastic parameters reveal the mechanical stability and ductile behavior of all considered alloys. The calculated Debye Temperature (θ D) assured that these alloys can be appropriate for high temperature devices due to high thermal conductivity ( κ ) and melting temperature (Tmelt). All these compounds are half metallic (HM) in nature as the band gap (Eg) is present in one spin orientation. The values of Eg for CrFeTiAl and CrFeTiGa are 0.68 eV and 0.86 eV respectively which are obtained by employing generalized gradient approximation (GGA) while Hubbard parameter (U) with GGA is used to calculate Eg of CrFeTiGe and CrFeTiSi and the Eg are 0.93 eV and 0.9 eV. The calculated magnetic moment (MM) of CrFeTiZ (Z = Al, Si, Ge, Ga) alloys agrees with Slater-Pauling rule (SPR). From the obtained results it is envisaged that these materials are suitable candidates for spintronic and high temperature devices.
Localização de Faltas em Redes VSC-HVDC por RNA e Coeficientes de Frequência Mel Cepstrais

Com o crescimento dos sistemas de transmissão de corrente contínua, é necessário propor e analisar métodos eficientes para localização de faltas. Esta pesquisa tem como objetivo obter e avaliar o desempenho de um algoritmo de localização de faltas em uma linha de transmissão de 200 km. O sistema VSC-HVDC de dois terminais foi modelado no Simulink e os dados foram pré-processados com os Coeficientes de Frequência Mel Cepstrais, do inglês Mel-Frequency Cepstral Coefficients (MFCC). Em seguida, uma Rede Neural Artificial (RNA) foi usada para estimar a localização da falta. Vários cenários foram simulados, variando a resistência e a localização da falta ao longo da linha. O baixo erro verificado na estimativa da distância demonstra a alta confiabilidade do método na localização da falta.
Nye jobber i fritt fall

Koronakrisen har fått dramatiske konsekvenser for økonomi og arbeidsmarked.1 Den rammet bredt og går ut over oss alle på en eller annen måte, men noen blir rammet hardere enn andre. I denne kommentaren fokuserer vi på virkningene koronakrisen har for nye åpninger i arbeidsmarkedet, målt ved nye stillingsutlysninger. Mens mange har blitt permitterte fra jobbene sine under koronakrisen, er de nye jobbene helt avgjørende både for de som mister jobben helt, og for de unge som i utgangspunktet er helt nye i arbeidsmarkedet. I denne kommentaren tar vi for oss utviklingen i nye stillingsutlysninger, med særlig vekt på grupper med ulik sårbarhet for krisen. I pandemiens tidligste fase var det en tydelig sosial skjevhet i hvem som var mest utsatt for å bli oppsagt eller permittert (Bratsberg, Eielsen, Markussen, Raaum, Røed & Vigtel 2020). En betydelig del av nye dagpengesøkere var unge arbeidstakere under 30 år. Personer med videregående eller lavere utdanning var også særlig utsatt, samt de med relativt lav lønn. De unge er spesielt sårbare av flere grunner. Noe av det første som skjer i en krise, er et fall i antallet nye jobber, og åpningene lukkes for de som ikke allerede har en jobb. Det er godt dokumentert at sysselsettingen blant unge er mer konjunkturfølsom enn sysselsettingen blant andre arbeidstakere (se for eksempel Barth og von Simson (2012)). For det andre er det betydelige langsiktige konsekvenser for kohorter av unge som kommer ut i arbeidsmarke-
Association of Mediterranean Diet Adherence, Functional Food Consumption and Anthropometric Characteristics with Anxiety and Depression Indexes in a Sample of Healthy Greek Adults: A Cross-Sectional Study

The purpose of this randomized, retrospective study was to investigate the possible association among levels of anxiety and depression and functional food consumption frequency, Mediterranean diet adoption and anthropometric indices in a sample of Greek, mainly young, adults. One hundred twenty healthy adults, 80% of whom were 18–35 years old, were randomly recruited from the North Aegean Islands, mainly from the Aegean University campus. The degree of anxiety was evaluated using the State-Trait Anxiety Inventory (STAI-X-1,2) whereas the degree of depression was assessed using the Beck Depression Inventory (BDI). Mediterranean diet adherence was evaluated using the Med Diet Score and functional foods consumption frequency by a validated food frequency questionnaire (FFQ). According to our results, the study did not show a statistically significant association between Mediterranean diet adherence and anxiety or depression levels (p > 0.05), and a trend association was observed only for the depression grouped score. In parallel, increased depression level was significantly correlated with an increased body mass index (BMI) (p = 0.019). In addition, the consumption of specific functional foods, such as beans, nuts, pomegranate, spinach and foods enriched with β-glucans, correlated with state-trait anxiety or depression levels, as well as with anthropometric indices (p < 0.05). The results of the study may contribute to the elucidation of the possible role of the Mediterranean diet and functional food consumption on self-esteem, anxiety and depression.
Singularity analysis and avoidance of a planar parallel mechanism with kinematic redundancy under a fixed orientation

In this paper, the singularity of a planar mechanism with kinematic redundancy is studied. First, the architecture of the mechanism and the concept schematic diagram for singularity avoidance are stated. Next, inverse kinematics model of the planar parallel mechanism with kinematic redundancy is established. For determining the unique inverse solution of the mechanism under certain initial installation configuration, a comparison analysis based on the strategy tree and the virtual prototype is performed. Then, based on the obtained Jacobian matrices and the singular condition, the workspace-singularity map and two singular configurations of the mechanism are drawn. Finally, with the obtained workspace-singularity map, a singularity-free transition layer and an aisle can be found to perform to singularity avoidance, even if the initial designed trajectory passing through the second kind of singularity. Three tasks are carried out to illustrate that the workspace boundary and singular configuration can be changed by adjusting the kinematic redundant actuated parameter.