Miracle-dz/UniFAR-FTUs huggingface dataset:
Broadband Circular Polarised Printed Antennas for Indoor Wireless Communication Systems: A Comprehensive Review

With the rapid changes in wireless communication systems, indoor wireless communication (IWC) technology has undergone tremendous development. Antennas are crucial components of IWC systems that transmit and receive signals within indoor environments. Thus, the development of indoor technology is highly dependent on the development of indoor antennas. However, indoor environments with limited space require the fewest indoor antenna units and the smallest indoor antenna sizes possible. Hence, indoor antennas with compact size and broad applications have become widely preferred. In an IWC system, circularly polarised (CP) antennas are generally important, especially in dense indoor environments, because compared with linearly polarised (LP) antennas, CP antennas reduce polarisation mismatch and multipath losses. This paper combs through the existing studies related to three-dimensional (3D) geometry (nonplanar) or waveguide indoor antennas and the two common approaches to two-dimensional (2D) geometry (planar) indoor antennas, namely, broadband CP printed monopole antennas (BCPPMAs) and broadband CP printed slot antennas (BCPPSAs). The advantages, disadvantages and limitations of previous works are highlighted as well. These research works are summarised, compared and analysed to understand the recent specifications of BCPPMAs and BCPPSAs to generate the most appropriate design structure suitable for current IWC systems.
A Flexible Ultrasound Array for Local Pulse Wave Velocity Monitoring

Pulse wave velocity (PWV) measured at a specific artery location is called local PWV, which provides the elastic characteristics of arteries and indicates the degree of arterial stiffness. However, the large and cumbersome ultrasound probes require an appropriate sensor position and pressure maintenance, introducing usability constraints. In this paper, we developed a light (0.5 g) and thin (400 μm) flexible ultrasound array by encapsulating 1–3 composite piezoelectric transducers with a silicone elastomer. It can capture the distension waveforms of four arterial positions with a spacing of 10 mm and calculate the local PWV by multi-point fitting. This is illustrated by in vivo experiments, where the local PWV value of five normal subjects ranged from 3.07 to 4.82 m/s, in agreement with earlier studies. The beat-to-beat coefficient of variation (CV) is 12.0% ± 3.5%, showing high reliability. High reproducibility is shown by the results of two groups of independent measurements of three subjects (the error between the mean values is less than 0.3 m/s). These properties of the developed flexible ultrasound array enable the bandage-like application of local PWV monitoring to skin surfaces.
Bullying in prisons in Argentina: a study of personality, mental health and attitudes

ABSTRACT Bullying in prisons is a construct with important psychosocial and physical consequences. The research examines the nature and extent of bullying in four prisons in Argentina, exploring demographics, personality, mental health, and attitudes towards bullying. Seven hundred and eighteen adult prisoners took part (667 men, 48 women, and 3 transgender), completing the DIPC-SCALED-r version (Direct and Indirect Prisoner Behaviour Checklist), and measures of personality, mental health, and bullying attitudes. Dark Triad traits, attitudes supportive of prison bullying/disapproving of victims, and prison experience were considered likely to predict perpetration, with depression predicting victimisation. Results demonstrated that bullying was predicted by higher levels of Dark Triad personality, specific attitudes supportive of bullying, younger age, and certain offence types (i.e. homicide/attempted homicide and robbery). Prison experience was not a predictor. Victimisation was a significant predictor of depression. Implications of these findings are outlined, with suggestions for future research made, including proposals for a reformulation of the MMBSS (Multifactor Model of Bullying in Secure Services).
Ultra-Fast and Sensitive Screening for Antibodies against the SARS-CoV-2 S1 Spike Antigen with a Portable Bioelectric Biosensor

As a consequence of the progress of the global vaccination against the COVID-19 disease, fast, accurate and affordable assays are needed for monitoring the efficiency of developing immunity against the coronavirus at the population level. In this context, we herewith report the proof-of-concept development of an innovative bioelectric biosensor for the ultra-detection (in less than three minutes) of IgG antibodies against the SARS-CoV-2 S1 spike antigen. The biosensor comprises a disposable set of screen-printed electrodes upon which are immobilized cells engineered to bear the S1 protein on their surface. When anti-S1 antibodies are presented to the engineered cell population, a rapid, specific, and selective change of the cell membrane potential occurs; this is in turn recorded by a bespoke portable potentiometer. End results are communicated via Bluetooth to a smartphone equipped with a customized user interface. By using the novel biosensor, anti-S1 antibodies could be detected at concentrations as low as 5 ng/mL. In a preliminary clinical trial, positive results were derived from patients vaccinated or previously infected by the virus. Selectivity over other respiratory viruses was demonstrated by the lack of cross-reactivity to antibodies against rhinovirus. After further clinical validation and extension to also screen IgM, IgA and possible neutralizing antibodies, our approach is intended to facilitate the mass and reliable detection of antibodies in the early stages following vaccination and to monitor the duration and level of acquired immunity both in a clinical and self-testing environment.
Teacher Performance Evaluation System in a Private School: A Case Study

The purpose of this research was to reveal how the performance evaluations of teachers in a private school were made and the results of those evaluations. The research was designed as a case study, which is one of the qualitative research methods. The research was carried out in the 2013-2014 academic year. The participants of this research were 15 teachers, 3 administrators, 6 students and 4 parents. The data were obtained through semi-structured interviews. Findings revealed that the performance evaluation of the teachers were based on the surveys from students, school administrators and parents, general observations made by school administrators, course inspections and follow-up with digital cameras. In this context, teachers were awarded during the year and at the end of the year depending on their performance evaluation results. Participants also mentioned some positive and negative consequences of the performance evaluation in the school. The rewards given vary based on the performance of the teachers. The main rewards were as follows: salary increase, plaques and certificates with symbolic value, and contract renewal. On the other hand, teachers were punished due to their low performance. The consequences of the punishment were as follows: verbal or written warning penalties, low pay raise in salary, termination of some duties at the school and non-renewal of contract/dismissal.
Changes in Phytoplankton Community Composition and Phytoplankton Cell Size in Response to Nitrogen Availability Depend on Temperature

The climate-driven changes in temperature, in combination with high inputs of nutrients through anthropogenic activities, significantly affect phytoplankton communities in shallow lakes. This study aimed to assess the effect of nutrients on the community composition, size distribution, and diversity of phytoplankton at three contrasting temperature regimes in phosphorus (P)–enriched mesocosms and with different nitrogen (N) availability imitating eutrophic environments. We applied imaging flow cytometry (IFC) to evaluate complex phytoplankton communities changes, particularly size of planktonic cells, biomass, and phytoplankton composition. We found that N enrichment led to the shift in the dominance from the bloom-forming cyanobacteria to the mixed-type blooming by cyanobacteria and green algae. Moreover, the N enrichment stimulated phytoplankton size increase in the high-temperature regime and led to phytoplankton size decrease in lower temperatures. A combination of high temperature and N enrichment resulted in the lowest phytoplankton diversity. Together these findings demonstrate that the net effect of N and P pollution on phytoplankton communities depends on the temperature conditions. These implications are important for forecasting future climate change impacts on the world’s shallow lake ecosystems.
Green Synthesis of Silver Nanoparticles Using the Plant Extract of Acer oblongifolium and Study of Its Antibacterial and Antiproliferative Activity via Mathematical Approaches

In this study, the antibacterial and antifungal properties of silver nanoparticles synthesized with the aqueous plant extract of Acer oblongifolium leaves were defined using a simplistic, environmentally friendly, reliable, and cost-effective method. The aqueous plant extract of Acer oblongifolium, which served as a capping and reducing agent, was used to biosynthesize silver nanoparticles. UV visible spectroscopy, X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and scanning electron microscopy were used to analyze the biosynthesized Acer oblongifolium silver nanoparticles (AgNPs). Gram-positive bacteria (Bacillus paramycoides and Bacillus cereus) and Gram-negative bacteria (E. coli) were used to test the AgNPs’ antibacterial activity. The presence of different functional groups was determined by FTIR. The AgNPs were rod-like in shape. The nanoparticles were more toxic against Escherichia coli than both Bacillus cereus and Bacillus paramycoides. The AgNPs had IC50 values of 6.22 and 9.43 and mg/mL on HeLa and MCF-7, respectively, proving their comparatively strong potency against MCF-7. This confirmed that silver nanoparticles had strong antibacterial activity and antiproliferative ability against MCF-7 and HeLa cell lines. The mathematical modeling revealed that the pure nanoparticle had a high heat-absorbing capacity compared to the mixed nanoparticle. This research demonstrated that the biosynthesized Acer oblongifolium AgNPs could be used as an antioxidant, antibacterial, and anticancer agent in the future.
Study of Fluctuations in Surface Area of Lake Haramaya using NDWI and MNDWI Methods

Lakes are of great value to human beings and important for various reasons like regulating the flow of river water, to maintain the eco-system and storage of water during the dry seasons. Lake Haramaya, which is situated at 14 km Northwest of Harer town (UNESCO Site) is one of the famous and beautiful lakes of Ethiopia. It acts as a source of life for human beings and animals. The over exploitation of the lake haramaya for water supply and agricultural purposes has led to its extinction in the last two decades. This study attempts to identify the fluctuations in surface area of Lake Haramaya between 1995 to 2020 by using multi-temporal satellite data. The Landsat 5TM images of 1995, 2000 and 2010, Landsat 7ETM+ image of 2005 and Landsat 8 OLI TIRS images of 2015 and 2020 are analyzed using the Normalized Difference Water Index (NDWI) and Modified Normalized Difference Water Index (MNDWI) methods. These methods are used to quantify the changes in surface area and compared to each other for identifying the suitable method for detecting water bodies. The present study shows that, between 1995 to 2010 the lake lost up to 2.3238 sq.km and almost dried. But, during 2011 to 2020 the lake surface area increased by 2.6946 sq.km. The study states that the lake surface area is fluctuating and MNDWI method is highly reliable in extracting water bodies.
Dynamic Interactions of Post Cleaved NS2B Cofactor and NS3 Protease Identified by Integrative Structural Approaches

Diseases caused by flaviviruses such as dengue virus (DENV) and West Nile Virus (WNV), are a serious threat to public health. The flavivirus single-stranded RNA genome is translated into a polyprotein which is cleaved into three structural proteins and seven non-structural proteins by the viral and cellular proteases. Non-structural (NS) protein 3 is a multifunctional protein that has N-terminal protease and C-terminal helicase domains. The NS3 protease requires co-factor NS2B for enzymatic activity and folding. Due to its essential role in viral replication, NS2B-NS3 protease is an attractive target for antiviral drugs. Despite the availability of crystal structures, dynamic interactions of the N- and C-termini of NS2B co-factor have been elusive due to their flexible fold. In this study, we employ integrative structural approaches combined with biochemical assays to elucidate the dynamic interactions of the flexible DENV4 NS2B and NS3 N- and C-termini. We captured the crystal structure of self-cleaved DENV4 NS2B47NS3 protease in post cleavage state. The intermediate conformation adopted in the reported structure can be targeted by allosteric inhibitors. Comparison of our new findings from DENV4 against previously studied ZIKV NS2B-NS3 proteins reveals differences in NS2B-NS3 function between the two viruses. No inhibition of protease activity was observed for unlinked DENV NS2B-NS3 in presence of the cleavage site while ZIKV NS2B-NS3 cleavage inhibits protease activity. Another difference is that binding of the NS2B C-terminus to DENV4 eNS2B47NS3Pro active site is mediated via interactions with P4-P6 residues while for ZIKV, the binding of NS2B C-terminus to active site is mediated by P1-P3 residues. The mapping of NS2B N- and C-termini with NS3 indicates that these intermolecular interactions occur mainly on the beta-barrel 2 of the NS3 protease domain. Our integrative approach enables a comprehensive understanding of the folding and dynamic interactions of DENV NS3 protease and its cofactor NS2B.
PRE-MAIN-SEQUENCE STARS IN THE CEPHEUS FLARE REGION

We present results of optical spectroscopic and BVRCIC photometric observations of 77 pre-main-sequence (PMS) stars in the Cepheus flare region. A total of 64 of these are newly confirmed PMS stars, originally selected from various published candidate lists. We estimate effective temperatures and luminosities for the PMS stars, and comparing the results with PMS evolutionary models, we estimate stellar masses of 0.2–2.4 M☉ and stellar ages of 0.1–15 Myr. Among the PMS stars, we identify 15 visual binaries with separations of 2–10 arcsec. From archival IRAS, Two Micron All Sky Survey, and Spitzer data, we construct their spectral energy distributions (SEDs) and classify 5% of the stars as Class I, 10% as Flat SED, 60% as Class II, and 3% as Class III young stellar objects. We identify 12 classical T Tauri stars and two weak-line T Tauri stars as members of NGC 7023, with a mean age of 1.6 Myr. The 13 PMS stars associated with L1228 belong to three small aggregates: RNO 129, L1228A, and L1228S. The age distribution of the 17 PMS stars associated with L1251 suggests that star formation has propagated with the expansion of the Cepheus flare shell. We detect sparse aggregates of ∼6–7 Myr old PMS stars around the dark clouds L1177 and L1219, at a distance of ∼400 pc. Three T Tauri stars appear to be associated with the Herbig Ae star SV Cep at a distance of 600 pc. Our results confirm that the molecular complex in the Cepheus flare region contains clouds of various distances and star-forming histories.
Analysis of the Concept of Obstetric Violence: Scoping Review Protocol

(1) Background: Obstetric violence has been highlighted in the political and social agenda of several countries. Efforts have been made to create policies to humanize obstetric care, guarantee the rights of pregnant women and respond to this form of violence. The lack of consensus on the appropriate terminology to name and define the behaviours that constitute obstetric violence, hinders this process. (2) Objective: To analyse the concept of obstetric violence related to assistance to women during labor. (3) Methodology: Scoping review protocol, according to the Joanna Briggs Institute method. The search will be performed on EBSCOhost Research Platform, PubMed, Virtual Health Library and SciVerse Scopus databases. The Open Scientific Repository of Portugal will also be considered. All types of studies, published in the last 10 years, in English, Spanish and Portuguese languages, constitute inclusion criteria. Studies of women experiencing labor, in a hospital setting, that address the dimensions of the concept of obstetric violence will be reviewed. (4) Discussion: The results will serve as a basis for identifying the appropriate terminology of the concept of obstetric violence, in order to direct future research with interest in the problem.
Comparison of thicknesses of talar cartilage, tibialis anterior, and gastrocnemius muscles between high-activity patients with unilateral traumatic transtibial amputation and nonamputated individuals: A clinical and sonographic study

Background: The aim of this study was to compare the thicknesses of intact talar cartilage, tibialis anterior (TA), gastrocnemius medialis (GCM), and gastrocnemius lateralis (GCL) muscles of traumatic unilateral transtibial amputees with that of nonamputated individuals by ultrasound and to investigate the relationship between cartilage and muscle thickness measurements with clinical parameters. Methods: Thirty-six patients with unilateral traumatic transtibial amputation, and 36 age-matched, sex-matched, and body mass index–matched nonamputated controls were included in this cross-sectional study. Subjects’ talar cartilage, TA, GCM, and GCL muscle thickness measurements were performed using musculoskeletal ultrasound. Other outcome measures were 6-minute walking test, the Foot and Ankle Outcome Score, and Short Form-36. Results: TA and GCM muscles were thicker on the intact limbs of the patients than those of the controls (p = 0.015 and p = 0.014, respectively). There was no statistically significant difference in talar cartilage and GCL muscle thicknesses when patients were compared with control subjects. Talar cartilage thickness was positively correlated with body mass index, 6-minute walking test, and sport and recreation subscale score of the Foot and Ankle Outcome Score. TA and GCM muscle thicknesses were positively correlated with the duration of prosthesis use and role limitations because of the physical health subscale score of Short Form-36. Conclusions: TA and GCM muscles were found to be thickened on the intact sides of traumatic unilateral transtibial amputees. The correlations between lower leg muscle thicknesses and clinical parameters suggest that the observed thickness change is not necessarily pathological and has potential impact on function at least in our young cohort.
DETERMINAN PENGUNGKAPAN ISLAMIC SOCIAL REPORTING (ISR) PADA PERUSAHAAN DI JAKARTA ISLAMIC INDEX (JII)

This study empirically analyzes the factors affecting Islamic Social Reporting (ISR), including profitability, liquidity, industry type, board of commissioner size, and company size. ISR, based on its category, is measured using ISR Index assessed from the companies’ annual report. The populations are all companies listed in Jakarta Islamic Index (JII) in 2017-2019. The samples include 17 companies selected through purposive sampling method, and are analyzed by multiple regression method. The results of this study indicate that the type of industry and company size have a significant effect on ISR; whilst, the profitability, liquidity, and board of commissioner size have no significant effect on ISR because manufacturing industry tends to be wider in disclosing its social responsibility reports, and this is also the case with large companies. This may be because the larger the size of the company, the larger the stakeholder community that must be served. Furthermore, profitability, liquidity, and the size of the board of commissioners have no significant effect on ISR because the company's orientation may be purely on profit or other financial aspects and the quality of ISR is not determined mainly by the quantity of the board of commissioners but may be caused by the quality or diversity of its members.
Raman Microspectroscopy Detection and Characterisation of Microplastics in Human Breastmilk

The widespread use of plastics determines the inevitable human exposure to its by-products, including microplastics (MPs), which enter the human organism mainly by ingestion, inhalation, and dermal contact. Once internalised, MPs may pass across cell membranes and translocate to different body sites, triggering specific cellular mechanisms. Hence, the potential health impairment caused by the internalisation and accumulation of MPs is of prime concern, as confirmed by numerous studies reporting evident toxic effects in various animal models, marine organisms, and human cell lines. In this pilot single-centre observational prospective study, human breastmilk samples collected from N. 34 women were analysed by Raman Microspectroscopy, and, for the first time, MP contamination was found in 26 out of 34 samples. The detected microparticles were classified according to their shape, colour, dimensions, and chemical composition. The most abundant MPs were composed of polyethylene, polyvinyl chloride, and polypropylene, with sizes ranging from 2 to 12 µm. MP data were statistically analysed in relation to specific patients’ data (age, use of personal care products containing plastic compounds, and consumption of fish/shellfish, beverages, and food in plastic packaging), but no significant relationship was found, suggesting that the ubiquitous MP presence makes human exposure inevitable.
Avaliação da qualidade de vida após síndrome coronariana aguda: revisão sistemática

Una revisión sistemática de los estudios que evaluaron la CV posterior al infarto agudo del Miocardio, demostró que los efectos del infarto sobre la CV se disipan a largo plazo, pero la evaluación específica de los pacientes que evolucionan con un compromiso de la función ventricular izquierda, en la fase aguda del evento, no parece haber sido realizada4. Además de eso, dos estudios indican que las consecuencias tanto de la enfermedad coronaria isquémica crónica, como de la insuficiencia cardíaca no son temporales, y que sus efectos en la mensuración de la CV empeoran justamente después del diagnóstico, sin presentar una mejoría en el seguimiento de los pacientes, a diferencia de lo que ha sido relatado después de un evento agudo4,5.
Syrian Refugees' Acceptance and Use of Mobile Learning Tools During the Covid-19 Pandemic

Mobile learning, which is widely used in educational settings during the COVID-19 pandemic, will continue playing a critical role in learning environments in the future. Since the successful implementation of mobile learning in education is largely based on users' acceptance of these technologies, it is essential to understand the factors affecting learners' acceptance of mobile devices as learning tools. This study investigated Syrian adult refugees' acceptance and use of mobile learning tools. The results revealed that Syrian adult refugees were positive about using mobile devices in learning Turkish as a second/foreign language, and there exists a concrete and significant correlation among all the constructs of the mobile learning tools acceptance like Perceived Ease of Use, Contribution to Foreign Language Learning, Negative Perceptions, and Voluntariness of Use. Factors affecting mobile learning acceptance was also investigated in the study, and the results indicated significant differences among the refugees regarding their characteristics such as age, gender, level of education. The results also revealed that while the refugees did better in the tests over time, mobile learning acceptance had no significant effect on foreign language achievement. Depending on these results, it can be suggested that mobile devices should be integrated into the education system as a component of the curriculum.