The Utilisation of Duolingo to Enhance the Speaking Proficiency of EFL Secondary School Students in Saudi Arabia

Even though Saudi EFL students devote multiple years to improving their English-speaking proficiency, they struggle to achieve fluency. The present study, however, focuses on investigating the effectiveness of using Duolingo in EFL classrooms to enhance the participants’ speaking proficiency. The participants who underwent this study were 28 male Saudi students studying in secondary school, namely at Sharia Institute. They were divided into control and experimental groups. Data was collected via post-test to conduct a valid comparison between the two groups. The 14 students in the experimental group had been using Duolingo for a period of four consecutive months while the participants in the control group have never used Duolingo. To make a valid comparison of the mean score between the two groups, an independent samples t-test was used in this experiment. After analysing the results, it has been concluded that the integration of Duolingo in the learning process has a fundamental positive impact on enhancing participants’ speaking proficiency as well as improving their overall language skills. Additionally, the participants’ positive attitude towards Duolingo was an intrinsic factor that helped alleviate their anxiety when speaking.  

Temperature Monitoring Devices in Neonates

Introduction: Accurate temperature monitoring of neonates is vital due to the significant morbidities and mortality associated with neonatal hypothermia. Many studies have compared different thermometers in neonates, however, there is a lack of consensus regarding which of the currently available thermometers is most suitable for use in neonates.Objectives: The aim of this review was to identify and compare current methods available for temperature monitoring of neonates beyond the delivery room, including the accuracy, advantages and disadvantages of each.Methods: A recent search and narrative synthesis of relevant studies published between January 1, 1949 and May 5, 2021 on the OVID Medline, PubMed and Google Scholar databases.Results: A total of 160 papers were retrieved for narrative synthesis. The main methods available for temperature monitoring in neonates are human touch and mercury-in-glass, electronic, infrared tympanic and other infrared thermometers. Newer innovations that are also available include liquid crystal thermometers and the BEMPU TempWatch. This paper discusses the current evidence available regarding the utility of these devices, and identifies barriers to valid comparison of different thermometry methods.Conclusion: Many methods for temperature monitoring in neonates are currently available, each with their own advantages and disadvantages. However, the accuracies of different devices are hard to determine due to variable methodologies used in relevant studies and hence, further research that addresses these gaps is needed.

No paradox here? Improving theory and testing of the nuclear stability–instability paradox with synthetic counterfactuals

This article contributes to both the theoretical elaboration and empirical testing of the ‘stability–instability paradox’, the proposition that while nuclear weapons deter nuclear war, they also increase conventional conflict among nuclear-armed states. Some recent research has found support for the paradox, but quantitative studies tend to pool all international dyads while qualitative and theoretical studies focus almost exclusively on the USA–USSR and India–Pakistan dyads. This article argues that existing empirical tests lack clearly relevant counterfactual cases, and are vulnerable to a number of inferential problems, including selection on the dependent variable, unintentionally biased inference, and extrapolation from irrelevant cases. The limited evidentiary base coincides with a lack of consideration of the theoretical conditions under which the paradox might apply. To address these issues this article theorizes some scope conditions for the paradox. It then applies synthetic control, a quantitative method for valid comparison when appropriate counterfactual cases are lacking, to model international conflict between India–Pakistan, China–India, and North Korea–USA, before and after nuclearization. The article finds only limited support for the paradox when considered as a general theory, or within the theorized scope conditions based on the balance of resolve and power within each dyad.

ROLE OF GEMINI SURFACTANTS IN FIGHT AGAINST COVID19

COVID-19, a pandemic, threatens the entire world by its multiplicative deadly behavior. Virus has caged the world’s people into their homes / isolation as their protective gear. Transmission rate, Case Fatality Rate, and Asymptomatic Transmission parameters determine the savage of COVID-19. More than a couple of months, mankind is staying locked in one’s home, which has never happened in the lifetime of any other generation. World Health Organization highlights the importance of hand Hygiene (Handwashing) by Soap/surfactant for 20 seconds and the use of alcohol-based Sanitizers as a part of personal health care. Soap functions as a weapon for sterilization of any viruses present on the surface. The lipid envelope of virusesis more susceptible to heat, desiccation or action of surfactants. Single tailed Quaternary ammonium compound surfactant is most commonly used as disinfectant or cleaning agent. Similarly, Gemini surfactants can also play a vital role as disinfectant / sanitizerin future. It is suggested that Gemini surfactants have imperative function in Air sanitation. Also, there is a valid comparison of Coronavirus with other SARS diseases. The deadly nature of virus can be understood by knowing its mechanism of action and mode of transmission. Once a chain of human to human transmission is initiated then it is very tricky to rupture the chain.

Applying grade inflation adjustment mechanism in an Ethiopian university: Differences in nominal and real grades

Abstract-Grade inflation is a recognized problem in universities around the world. The factors underlying grade inflation are also discussed by studies. The objective of this study was: firstly, to observe the degree of grade inflation by analyzing the difference between nominal grades and real grades of students across departments. Secondly, the study analyzes the relationship between aptitude test scores and college GPA. In order to achieve these objectives, the first semester grades of all Wachemo university first batch third-year students (total 435 students: male 287 female 148) were collected from the registrar and the nominal and real grades were calculated. The Grieves method of real grade analysis formula was used to analyze the real grades. The findings of this study revealed that although there was no severity of grade inflation in the semester, 4 departments out of 12 departments registered inflated grades. The correlation between nominal and real grades of students is positive and strong indicating that real grades are grade-inflation adjusted nominal grades. There was a zero correlation between aptitude test scores and the college GPA in this study. The similarity of the grading system, and the similarity and the harmonization of the courses make the Grieve’s method of grade inflation adjustment mechanism to be applied in Ethiopian universities. In addition, mechanisms of adjusting grade inflation better have attention in Ethiopia in order to standardize grades from different universities to have a fairer and valid comparison of graduates for employment. Key words: Nominal grade, real grade, aptitude test scores

Developing Artefact Removal Algorithms to Process Data from a Microwave Imaging Device for Haemorrhagic Stroke Detection

In this paper, we present an investigation of different artefact removal methods for ultra-wideband Microwave Imaging (MWI) to evaluate and quantify current methods in a real environment through measurements using an MWI device. The MWI device measures the scattered signals in a multi-bistatic fashion and employs an imaging procedure based on Huygens principle. A simple two-layered phantom mimicking human head tissue is realised, applying a cylindrically shaped inclusion to emulate brain haemorrhage. Detection has been successfully achieved using the superimposition of five transmitter triplet positions, after applying different artefact removal methods, with the inclusion positioned at 0°, 90°, 180°, and 270°. The different artifact removal methods have been proposed for comparison to improve the stroke detection process. To provide a valid comparison between these methods, image quantification metrics are presented. An “ideal/reference” image is used to compare the artefact removal methods. Moreover, the quantification of artefact removal procedures through measurements using MWI device is performed.

A Clarification of Slope and Scale

Improvements in the quantification and visual analysis of data, plotted across non-standardized graphs, are possible with the equations introduced in this paper. Equation 1 (an expression of graphic scale variability) forms part of the foundation for Equation 2 (an expansion on the traditional calculation of the tangent inverse of a line’s algebraic slope). These equations provide clarification regarding aspects of “slope” and graphic scaling that have previously confused mathematicians. The apparent lack of correspondence between geometric slope (the angle of inclination) and algebraic slope (the m in y = mx + b) on “non-homogeneous” graphs (graphs where the scale values/distances on the y-axis are not the same as on the x-axis) is identified and directly resolved. This is important because nearly all behavior analytic graphs are “non-homogeneous” and problems with consistent visual inspection of such graphs have yet to be fully resolved. This paper shows how the precise geometric slope for any trend line on any non-homogeneous graph can quickly be determined—potentially improving the quantification and visual analysis of treatment effects in terms of the amount/magnitude of change in slope/variability. The equations herein may also be used to mathematically control for variability inherent in a graph’s idiosyncratic construction, and thus facilitate valid comparison of data plotted on various non-standard graphs constructed with very different axes scales—both within and across single case design research studies. The implications for future research and the potential for improving effect size measures and meta-analyses in single-subject research are discussed.

Sleep Deprived or Concussed? The Acute Impact of Self-Reported Insufficient Sleep in College Athletes

Objective: Sleep deprivation is common among both college students and athletes and has been correlated with negative health outcomes, including worse cognition. As such, the current study sought to examine the relationship between sleep difficulties and self-reported symptoms and objective neuropsychological performance at baseline and post-concussion in collegiate athletes. Method: Seven hundred seventy-two collegiate athletes completed a comprehensive neuropsychological test battery at baseline and/or post-concussion. Athletes were separated into two groups based on the amount of sleep the night prior to testing. The sleep duration cutoffs for these group were empirically determined by sample mean and standard deviation (M = 7.07, SD = 1.29). Results: Compared with athletes getting sufficient sleep, those getting insufficient sleep the night prior to baseline reported significantly more overall symptoms and more symptoms from each of the five symptom clusters of the Post-Concussion Symptom Scale. However, there were no significant differences on objective performance indices. Secondly, there were no significant differences on any of the outcome measures, except for sleep symptoms and headache, between athletes getting insufficient sleep at baseline and those getting sufficient sleep post-concussion. Conclusion: Overall, the effect of insufficient sleep at baseline can make an athlete appear similar to a concussed athlete with sufficient sleep. As such, athletes completing a baseline assessment following insufficient sleep could be underperforming cognitively and reporting elevated symptoms that would skew post-concussion comparisons. Therefore, there may need to be consideration of prior night’s sleep when determining whether a baseline can be used as a valid comparison.