Miracle-dz/UniFAR-FTUs huggingface dataset:
Reactive power control of grid-connected photovoltaic micro-inverter based on third-harmonic injection

This paper presents four interleaved flyback DC-DC converters. Each flyback converter contains a separate maximum power point tracker (MPPT). The MPP tracker is used to collect the maximum power value from photovoltaic panel by using (P&O) algorithm with an output of reference current. In latest years, the active third-harmonic injection circuit have received much interest, this technique contributed to getting a better quality of injection current into the utility grid and control the reactive power. For converting direct current to three-phase sinusoidal currents, a line-commutated current source inverter type (CSI) with filter is used. The developed micro-inverter of (1000 W) offers an expanded range of reactive power control with balanced three-phase output power and good efficiency 95.07%. The effectiveness of the suggested system is clarified through the MATLAB program simulation. The system proposed in this paper has proven its effectiveness in obtaining reactive power control, nearly sinusoidal three-phase output currents and it is compared with the traditional PV micro-inverter system. The comparison shows that the PV micro-inverter is best in more specification than the traditional PV system such as efficiency and total harmonic distortion (THD) and the system losses.
Computational Study of the Adsorption of Phosphates as Wastewater Pollutant Molecules on Faujasites

The adsorption of sodium dihydrogen phosphate (NaH2PO4) onto X- and Y-type faujasite zeolites was computationally studied using the Density Functional Theory (DFT) method. The structures were modeled using the Materials Studio software. The Si/Al ratios for the X- and Y-type zeolite models were 1.2 and 2.5, respectively. The central pore of the zeolite provided a more favorable coordination for adsorbing NaH2PO4. Full molecular optimization and adsorption energy calculations were performed using the VASP code. The adsorption was more effective on zeolite Y, with an adsorption energy of 161 kJ/mol, compared to the zeolite X system, with an adsorption energy of 31.64 kJ/mol. This calculated value for X-type faujasite was found in the interval of the adsorption energy of H2PO4− on hydrated Fe oxide (94.4 kJ/mol) and modified polyether sulfone (22.5 kJ/mol), and the calculated adsorption energy of the molecule on Y-type faujasite coincides with the reported value for this adsorbate on Mg/Ca-modified biochar structures. The molecular conformations of the adsorbate on the two studied models are very different, so the difference between the adsorption energy values of each type of zeolite model is comprehensible. On the one hand, the oxygen atoms of the molecule formed a bidentate complex with the hydrogen atoms of the pore in the X-type faujasite model, and the O-H distance was 1.5 Ǻ. On the other hand, an adsorbed oxygen atom of the phosphate was placed on a hydrogen atom at site II of the Y-type faujasite zeolite, and two of the hydrogen atoms of the phosphate were placed on the oxygen atoms. The Bader analysis results indicated that the negative charge of the phosphate anions was delocalized on the zeolites protons. The hydroxy groups of the phosphate form bonds between their hydrogen atoms and the oxygen atoms of the zeolite porous structure; therefore, we concluded that these sites have an alkaline character. The aim of this study was to include a computational analysis of possible phosphate adsorption mechanisms in faujasite zeolites that can be confirmed by experimental tests, and hence contribute to the generation of new technologies for capturing pollutant molecules in wastewater. The results are in agreement with the experimental information concerning the influence of pH on the adsorption activity of phosphate adsorption on zeolites.
On-wafer characterization of monolithic millimeter-wave integrated circuits by a picosecond optical electronic technique

A picosecond optical electronic sampling technique for the characterization of monolithic microwave integrated circuits (MMICs) has been developed. The measured time-domain response allows the spectral transfer function of the MMIC to be obtained. This technique was applied to characterize the frequency response of a two-stage Ka-band MMIC amplifier. The broadband results agree well with those obtained by conventional network analyzer measurements. <<ETX>>
Uma revisão sistemática da literatura sobre ferramentas de autoria de IMS-LD

This article presents a systematic review of the literature on the authoring tools based on IMS-LD, features and functionality, as well as units of learning (UoL) reuse possibilities. For this, we used the RSL models Kitchenham (2007), Marshall and Brereton, (2013), and IMS-LD concepts of Koper (2004), Koper and Manderveld (2004) and IMS (2003). The results show the existence of various authoring tools, but usability issues or incompatibility between them that prevent greater reuse and wide use among stakeholders.
Correction of a Secondary Bilateral Cleft Lip Nasal Deformity in Adults Using Repositioning of Both Lower Lateral Cartilages and Nasal Tip Plasty Through an Open Bilateral Reverse-U Incision

Background: Correcting a secondary bilateral cleft lip nasal deformity is very complex with many challenges due to its complexity. This study presents the surgical results after correcting a secondary bilateral cleft lip nasal deformity using isolation and repositioning of the lower lateral cartilages, the columellar strut, and an onlay graft on the nasal tip. Method: Eighteen patients who had bilateral cleft lip nasal deformities and who had surgery performed between September 2013 and December 2019 were included in this study. The age of the patients ranged between 19 and 52 years. Open rhinoplasty with bilateral reverse-U incision was performed. The lower lateral cartilages were isolated and repositioned. Nasal tip support is provided using a columellar strut with a septal cartilage or Medpor strut. In the vertical component of the nasal tip, a conchal cartilage graft was used. The mean follow-up period was 2 years (ranging from 1 to 6 years). Results: Fourteen of the 18 patients underwent photogrammetric evaluation. After surgery, the projection of the nasal tip and angle increased, but nasal bridge length decreased. The columella–labial angle significantly increased by 10.1% after surgery which was statistically significant (P < 0.05). The angle between the nostril axes significantly decreased by 46.2% postoperatively and also reached statistical significance (P < 0.05), indicating that the displaced alar base and lower nostril sill improved and the major axis of the nostril changed more vertically oblique. All patients were pleased with their surgical results. Conclusion: The proposed technique was highly effective in correcting secondary bilateral cleft lip nasal deformities in adults.
Novel robust gain scheduled PID controller design using DR regions

This paper develops a new design procedure for robust output feedback gain scheduled and switched PID controller design for a linear parameter varying discrete‐time system with polytopic uncertainties. The proposed approach is based on DR regions for robust pole placement and allows to consider also other performance indices. The design procedure aims to design a robust PID gain scheduled and switched controller for polytopic gain scheduled and switched plant model such that the closed‐loop eigenvalues for fixed gain scheduled parameters are in the prescribed DR region and the corresponding quadratic performance has the minimal value. The obtained design procedure can be also used to design a robust discrete‐time switched controller with arbitrarily switching law.
Poetry Writing and the Dialectic of Closeness. Creative Encounters with Nairobi Urban Sentinels

This article provides reflexive feedback on a four hands poetry writing experiment as a field method for fostering expression in people unaccustomed to it. To complement my in-depth interviews with private security guards at the gates of fenced residences in Nairobi (Kenya), I conducted several poetry workshops with them between 2015 and 2017. Although this medium is no more authentic than conventional storytelling, poetry as a four hands practice allowed us to overcome inhibiting dualities (I/the Other; authentic/non authentic; here/there). Retrospectively, I argue that this collective work should be understood as the expression of a dialectic of closeness between the two coauthors, i.e. a codified oscillation game between two sets of attitudes: maintaining an explicit distance and attempting micro-intrusions. This dialectic may lead us to reconsider our relationship with the produced text, making it an independent third protagonist, but nevertheless necessary for the encounter.
Understanding the Intention to Use Virtual Currency in a Gamified E-Commerce Context

Gamification is all about using game features in a serious context to encourage people to use products or services. E-commerce has used gamification for marketing determinations to strengthen intent to use. Technology Acceptance Model is employed in the current study to investigate the intention to use gamified virtual currency in the Indian context. A survey was used to accumulate records from a random sample of relevant virtual currency users in an e-commerce context using a quantitative approach. Structural equation modeling (SEM) is expended for data analysis in this research. This empirical research shows the incremental impact of the users' perceptions of the ease of use and usefulness on intention to use virtual currency. The variable attitude seems to be not mediating significantly. There are also discussions, restrictions, and future research directions mentioned in this study
Dual Crop Coefficient Approach in Vitis vinifera L. cv. LOUREIRO

Vineyard irrigation management in temperate zones requires knowledge of the crop water requirements, especially in the context of climate change. The main objective of this work was to estimate the crop evapotranspiration (ETc) of Vitis vinifera cv. Loureiro for local conditions, applying the dual crop coefficient approach. The study was carried out in a vineyard during two growing seasons (2019–2020). Three irrigation treatments, full irrigation (FI), deficit irrigation (DI), and rainfed (R), were considered. The ETc was estimated using the SIMDualKc model, which performs the soil water balance with the dual Kc approach. This balance was performed by calculating the basal coefficients for the grapevine (Kcb crop) and the active soil ground cover (Kcb gcover), which represent the transpiration component of ETc and the soil evaporation coefficient (Ke). The model was calibrated and validated by comparing the simulated soil water content (SWC) with the soil water content data measured with frequency domain reflectometry (FDR). A suitable adjustment between the simulated and observed SWC was obtained for the 2019 R strategy when the model was calibrated. As for the vine crop, the best fit was obtained for Kcb full ini = 0.33, Kcb full mid = 0.684, and Kcb full end = 0.54. In this sense, the irrigation schedule must adjust these coefficients to local conditions to achieve economically and environmentally sustainable production.
Romantic Partner Interference and Psychological Reactance in the Context of Caregiving for an Aging Family Member

Negotiating romantic relational dynamics is inherent to family caregiving situations, which continue to be on the rise in the United States. However, despite evidence that family caregiving duties are linked to a variety of negative relational outcomes, limited research examines communication processes that contribute to or alleviate the burden of caregiver duties on romantic relationships. Guided by psychological reactance theory (PRT), this study examined the link between romantic partner interference with family caregiving duties and the reactance process, as well as directness of communication about irritation as a type of freedom restoration behavior associated with reactance. Adults caring for aging family members recruited from MTurk (N = 187) completed an online survey as part of a larger study of romantic partner communication surrounding family caregiving. Results using PROCESS serial mediation indicated that greater partner interference was related to heightened perceptions of freedom threat, which was positively associated with the experience of reactance, which in turn was associated with communication about irritation. However, the association between reactance and directness of communication about irritation was negative, the opposite direction of what was hypothesized. Implications for PRT and interventions with caregivers and their romantic partners are discussed.
3-D dynamic simulation of knitwear based on the hybrid model

Due to the effect of force and deformation of fancy stitches, the simulation of knitwear is facing a great challenges of the real-time. In this paper, the physical-geometric hybrid method is applied to reduce the amount of calculation during the simulation of knitwear. Discretized Newton’s Method is used to analyze the gap between dynamic knitwear-human body and the knitwear model, and then the knitwear model is further divided into different regions. A three-dimensional (3-D) mesh for knitwear is constructed by the application of adaptive remeshing. This makes it possible to refine the mesh at the parts that need the presentation of fabric surface details. Simultaneously, it can merge the adjacent patches at parts without the requirement of showing the details, and form a large 3-D patch. In the light of regional division, the 3-D knitwear model is divided into the tight layer, floating layer, and loose layer. In addition, the geometric loop model based on the cuboid particle system is employed to simulate the real force of loops and knitwear for tight layer and loose layer. Near-rigid deformation method is also applied into the floating layer to improve simulation efficiency. In conclusion, the corresponding processing method is performed with different computational models, which brings the dynamic simulation effect of knitwear with realistic and real-time.
Semiconductor thickness effects in the double-gate SOI MOSFET

Influence of the semiconductor film thickness in the double-gate silicon on-insulator (SOI) MOSFET on the electron concentration distribution, electron charge density, threshold voltage, electron effective mobility, and drain current is theoretically analyzed. The consideration of the semiconductor region is based on two descriptions: the "classical" model based on a solution to the Poisson equation and the "quantum" model based on a self-consistent solution to the Schrodinger and Poisson equation system. The electron effective mobility and the drain current are calculated with the use of the local mobility model.
Effect of Truck Lane Restriction and Differential Speed Limit on Traffic Characteristics of Four-Lane Rural Freeways

Trucks play a significant role in highway safety and operation because of their different operating characteristics. To mitigate the impact of truck traffic on operation and safety, some states, including Louisiana, have resorted to policies that restrict trucks in terms of lane use and speed limit on specific freeway segments. In this study, an investigation was conducted to measure the effectiveness of the implemented policies on an 18-mile four-lane elevated segment of I-10, where trucks are restricted to the right lane with a speed limit of 55 mph. One of the primary objectives of the research study was to examine the traffic characteristics and truck compliance to the restrictions over the study section. Traffic data was collected and analyzed for four different sites along the freeway corridor using the statistical methods presented in this paper. The basic statistical analysis showed that the speed in the left lane was much higher than it was in the right lane as a result of the imposed differential speed limit. The results also showed more trucks in the right lane than in the left lane, with a compliance rate in the range of 60% to 80% most of the time. To further evaluate more detailed aspects of the compliance of trucks to the differential speed limit policy, linear regression models were applied to determine the variables with the most significant effect on speed.
Sound Source Localization Based on Audio-visual Information for Intelligent service Robots

In this paper, we present an Sound Source Localization (SSL) based on audio-visual information with robot auditory system for a network-based intelligent service robot. The main goal of this paper is to combine audiovisual-based Human-Robot Interaction (HRl) components that can naturally interact between human and robot for SSL. The proposed approach includes two main steps. The first step performs speech recognition and sound localization to know whether the user calls the robot or not as well as the direction of the caller respectively, when someone calls robot's name. Here sound localization is based on GCC(Generalized Cross-Correlation)-PHAT(phase Transform) by frequency characteristics. In the second step, a robot moves forward to the caller based on face detection. The robot platform used in this work is wever-R2, which is a network-based intelligent service robot developed at Intelligent Robot Research Division in ETRI. The effectiveness of the proposed approach is compared with audio-based SSL itself.
Factors Associated with Anxiety-Related Disorders in Children and Adolescents during COVID-19 in Oman: A Cross-Sectional Study

BACKGROUND: Reports from different parts of the world suggest that the COVID-19 pandemic and the resultant lockdown and social distancing measures have heralded unprecedented mental health challenges among children and adolescents. To date, there is a dearth of studies emerging from the Arabian Gulf, where the majority of its population are children and adolescents. The study aims to examine the prevalence of anxiety-related disorders and their covariates among children and adolescents in an Arabian Gulf country, Oman. METHODS: This is a cross-sectional analytic study carried out over two weeks (1st to 15th of August 2020) during the COVID-19 pandemic across Oman. Parents were asked to complete the online survey, which consisted of the parent version of the Screen for Child Anxiety Related Disorders (SCARED-41) scale and questions regarding basic socio-demographic information. Logistic regression was used to identify the contributing variables associated with anxiety-related disorders. RESULTS: A total of 790 children, 33.3% (n=263) fulfilled the criteria for anxiety-related disorders. Logistic regression analysis suggested that anxiety-related disorders in children were significantly associated with three demographic variables. The model shows that children with divorced or separated parents were 1.9 times more likely to have anxiety-related disorders than children of married couples (OR=1.93, p=0.035). Children living in families with an income below USD 1,000/month, were 1.8 times more likely to have anxiety-related disorders than a family with an income of USD 4,000/month (OR=1.833, p=0.018). Children in grades 3-6 were 1.8 times more likely to have anxiety-related disorders than those in grades 1-2 (OR=1.79, p=0.024). CONCLUSIONS: Anxiety-related disorders are common among Arabic-speaking Omani children and adolescents. They are more likely to be reported in middle scholastic grade levels and children from families with marital discord and low socioeconomic status. It is not clear whether the presently observed rates of anxiety exceed the prevalence that would have been observed pre-COVID-19 era. More studies are therefore warranted using children and adolescents' self-reported scales.
A joint transition model for evaluating eGFR as biomarker for rejection after kidney transplantation

The estimated glomerular filtration rate (eGFR) quantifies kidney graft function and is measured repeatedly after transplantation. Kidney graft rejection is diagnosed by performing biopsies on a regular basis (protocol biopsies at time of stable eGFR) or by performing biopsies due to clinical cause (indication biopsies at time of declining eGFR). The diagnostic value of the eGFR evolution as biomarker for rejection is not well established. To this end, we built a joint model which combines characteristics of transition models and shared parameter models to carry over information from one biopsy to the next, taking into account the longitudinal information of eGFR collected in between. From our model, applied to data of University Hospitals Leuven (870 transplantations, 2 635 biopsies), we conclude that a negative deviation from the mean eGFR slope increases the probability of rejection in indication biopsies, but that, on top of the biopsy history, there is little benefit in using the eGFR profile for diagnosing rejection. Methodologically, our model fills a gap in the biomarker literature by relating a frequently (repeatedly) measured continuous outcome with a less frequently (repeatedly) measured binary indicator. The developed joint transition model is flexible and applicable to multiple other research settings.
Quantification of Loess Landforms from Three-Dimensional Landscape Pattern Perspective by Using DEMs

Quantitative analysis of the differences and the exploration of the evolution models of different loess landform types are greatly important to the in-depth understanding of the evolution process and mechanism of the loess landforms. In this research, several typical loess landform areas in the Chinese Loess Plateau were selected, and the object-oriented image analysis (OBIA) method was employed to identify the basic loess landform types. Three-dimensional (3D) landscape pattern indices were introduced on this foundation to measure the morphological and structural features of individual loess landform objects in more detail. Compared with the traditional two-dimensional (2D) landscape pattern indices, the indices consider the topographic features, thereby providing more vertical topographic information. Furthermore, the evolution modes between different loess landform types were discussed. Results show that the OBIA method achieved satisfying classification results with an overall accuracy of 88.12%. There are evident differences in quantitative morphological indicators among loess landform types, especially in indicators such as total length of edge, mean patch size, landscape shape index, and edge dimension index. Meanwhile, significant differences are also found in the combination of loess landform types corresponding to different landform development stages. The degree of surface erosion became increasingly significant as loess landforms developed, loess tableland area rapidly reduced or even vanished, and the dominant loess landform types changed to loess ridge and loess hill. Hence, in the reconstruction and management of the Loess Plateau, the loess tableland should be the key protected loess landform type. These preliminary results are helpful to further understand the development process of loess landforms and provide a certain reference for regional soil and water conservation.
Adolescents in Divorced Families: The Interplay of Attachment Patterns, Family Environment, and Personal Characteristics

ABSTRACT The study examined adolescents (N = 230) in divorced families in relation to the adolescent’s attachment pattern, family environment, and personal characteristics. The findings revealed significant direct links of attachment patterns. Avoidant and anxious attachment patterns were found to influence adolescent loneliness, neuroticism, and well-being. Family environment factors of family cohesion, family flexibility, inter-parental conflict, and parent-child relationships significantly impacted adolescents’ social and emotional adjustment. Personal characteristics (child’s age at the time of divorce, length of time since divorce, and mother’s socioeconomic status) had significant effects on adolescents’ adjustment. Mother-child/ father-child relationships also had mediation effects on adolescents’ adjustment.