Incarcerated students' experiences of UNISA’s open distance e-learning at one Medium Correctional Centre

Technology mediated pedagogies of the 21st century present new and unprecedented challenges for incarcerated tertiary students. The researchers, employing a qualitative exploratory research design, sought to explore the learning experiences of UNISA students incarcerated at Baviaanspoort Medium Correctional Centre. Six participants were sampled purposively and recruited to participate during a focus group interview. Qualitative content analysis revealed the ever-changing landscape of higher education due to the advent of digitised e-learning; the unique challenges encountered by incarcerated students studying at tertiary level; strategies for overcoming barriers associated with ODeL; and that lastly, in the context of imprisonment, student-centeredness is still primarily informed by a constructivist approach to ODL. The study concluded that students’ learning experiences, and by extension, academic success, can be enhanced provided learner support is augmented for incarcerated tertiary students

Evaluation of coursework information access and sharing on smart devices by postgraduate students

Background: There is a growing trend for students to use their smart devices to share coursework information and access social media platforms. Although smart devices have been in existence and used by the students for several years, very little has been documented on the coursework information accessed and shared on smart devices. Objectives: The study focused on investigating academic activities in terms of students’ coursework information accessing and sharing, which include the type of information they use their smart devices for and the frequency of using their smart devices to access coursework information and sources of information. The study also identified challenges that students come across while accessing and sharing coursework information. Method: The mixed-method sequential research approach was used to collect data using questionnaires and interviews. The quantitative phase involved the collection and analysis of data using questionnaires. Questionnaires were sent online to the entire population of 255 students who had completed their workshops and were not on campus any more, as well as a paper format questionnaire that was handed out to the 60 MCom first-year students who were still attending their workshops on campus. A total of 315 questionnaires were sent to the students. There were 61 online questionnaires and 51 paper questionnaires returned. Therefore, a total of 112 questionnaires were returned. The qualitative phase involved the collection and analysis of data using interviews with 10 participants. Results: The results revealed that students used their smart devices for accessing and sharing coursework activities such as announcements, handouts, lecture notes and articles. Bibliographic references, group discussion notes, online articles and book lists were accessed and shared frequently by participants. Students used their smart devices frequently to access sources of information such as Blackboard, academic databases and Google Scholar. Conclusion: The implications and contributions of the study are that although students use their smart devices regularly, there is a need for institutions to understand the type of information that is gathered and shared using smart devices. As students also access social media platforms they need to understand the implications of relevant policies

Optical properties of biosynthesized nanoscaled Eu2O3 for red luminescence applications

This contribution reports on the optical properties of biosynthesised Eu2O3 nanoparticles bioengineered for the first time by a green and cost effective method using aqueous fruit extracts of Hyphaene thebaica as an effective chelating and capping agent. The morphological, structural, and optical properties of the samples annealed at 500°C were confirmed by using a high-resolution transmission electron microscope (HR-TEM), x-ray diffraction analysis (XRD), UV–Vis spectrocopy, and photoluminescence spectrometer. The XRD results confirmed the characteristic body-centered cubic (bcc) structure of Eu2O3 nanoparticles with an average size of 20 nm. HR-TEM revealed square type morphology with an average size of ∼6nm. Electron dispersion energy dispersive x-ray spectroscopy spectrum confirmed the elemental single phase nature of pure Eu2O3. Furthuremore, the Fourier transformed infrared spectroscopy revealed the intrinsic characteristic peaks of Eu−O bond stretching vibrations. UV–Vis reflectance proved that Eu2O3 absorbs in a wide range of the solar spectrum from the VUV–UV region with a bandgap of 5.1 eV. The luminescence properties of such cubic structures were characterized by an intense red emission centered at 614 nm. It was observed that the biosynthesized Eu2O3 nanoparticles exhibit an efficient red-luminescence and hence a potential material as red phosphor

Changes in the mechanical, structural and electrical properties of glassy carbon due to strontium and silver co-implantation and annealing

Please read abstract in the article.https://www.elsevier.com/locate/apsusc2022-09-22hj2022Physic

Towards Establishment of a Rice Stress Response Interactome

Rice (Oryza sativa) is a staple food for more than half the world and a model for studies of monocotyledonous species, which include cereal crops and candidate bioenergy grasses. A major limitation of crop production is imposed by a suite of abiotic and biotic stresses resulting in 30%–60% yield losses globally each year. To elucidate stress response signaling networks, we constructed an interactome of 100 proteins by yeast two-hybrid (Y2H) assays around key regulators of the rice biotic and abiotic stress responses. We validated the interactome using protein–protein interaction (PPI) assays, co-expression of transcripts, and phenotypic analyses. Using this interactome-guided prediction and phenotype validation, we identified ten novel regulators of stress tolerance, including two from protein classes not previously known to function in stress responses. Several lines of evidence support cross-talk between biotic and abiotic stress responses. The combination of focused interactome and systems analyses described here represents significant progress toward elucidating the molecular basis of traits of agronomic importance

May Measurement Month 2018: a pragmatic global screening campaign to raise awareness of blood pressure by the International Society of Hypertension

Aims Raised blood pressure (BP) is the biggest contributor to mortality and disease burden worldwide and fewer than half of those with hypertension are aware of it. May Measurement Month (MMM) is a global campaign set up in 2017, to raise awareness of high BP and as a pragmatic solution to a lack of formal screening worldwide. The 2018 campaign was expanded, aiming to include more participants and countries. Methods and results Eighty-nine countries participated in MMM 2018. Volunteers (≥18 years) were recruited through opportunistic sampling at a variety of screening sites. Each participant had three BP measurements and completed a questionnaire on demographic, lifestyle, and environmental factors. Hypertension was defined as a systolic BP ≥140 mmHg or diastolic BP ≥90 mmHg, or taking antihypertensive medication. In total, 74.9% of screenees provided three BP readings. Multiple imputation using chained equations was used to impute missing readings. 1 504 963 individuals (mean age 45.3 years; 52.4% female) were screened. After multiple imputation, 502 079 (33.4%) individuals had hypertension, of whom 59.5% were aware of their diagnosis and 55.3% were taking antihypertensive medication. Of those on medication, 60.0% were controlled and of all hypertensives, 33.2% were controlled. We detected 224 285 individuals with untreated hypertension and 111 214 individuals with inadequately treated (systolic BP ≥ 140 mmHg or diastolic BP ≥ 90 mmHg) hypertension. Conclusion May Measurement Month expanded significantly compared with 2017, including more participants in more countries. The campaign identified over 335 000 adults with untreated or inadequately treated hypertension. In the absence of systematic screening programmes, MMM was effective at raising awareness at least among these individuals at risk

Reduction of visual acuity decreases capacity to evaluate radiographic image quality

Aim: To determine the impact of reduced visual acuity on the evaluation of a test object and appendicular radiographs. Methods: Visual acuity was reduced by two different magnitudes using simulation glasses and compared to normal vision (no glasses). During phase one phantom images were produced for the purpose of counting objects by 13 observers and on phase 2 image appraisal of anatomical structures was performed on anonymized radiographic images by 7 observers. The monitors were calibrated (SMPTE RP133 test pattern) and the room lighting was maintained at 7 ±1 lux. Image display and data on grading were managed using ViewDEX (v.2.0) and the area under the visual grading characteristic (AUCVGC) was calculated using VGC Analyzer (v1.0.2). Inferential statistics were calculated using SPSS. Results: For the evaluation of appendicular radiographs the total interpretation time was longer when visual acuity was reduced with 2 pairs of simulation glasses (15.4 versus 8.9 min). Visual grading analysis showed that observers can lose the ability to detect anatomical and contrast differences when they have a simulated visual acuity reduction, being more challenging to differentiate low contrast details. No simulation glasses, compared to 1 pair gives an AUCVGC of 0.302 (0.280, 0.333), that decreases to 0.197 (0.175, 0.223) when using 2 pairs of glasses. Conclusions: Reduced visual acuity has a significant negative impact on the evaluation of test objects and clinical images. Further work is required to test the impact of reduced visual acuity on visual search, technical evaluation of a wider range of images as well as pathology detection/characterization performance

A Survey On Entomophagy Prevalence In Zimbabwe

This study was to determine the prevalence of entomophagy in the post independence era (after 1980) in Zimbabwe given that the social status of many families has changed. A cross-sectional non probability sampling was used to determine who ate which insect and how much they ate and where they came from. The availability of each insect was determined at provinces and through key informants. Data were collected through questionnaires and physical visits to all provinces of Zimbabwe to collect empirical data. The population of those that never participated in entomophagy was less than 10% across the age groups in the sampled populations. In the order, Lepidoptera, which comprises several species the larval stages are mostly consumed in the fourth instar after degutting. The caterpillars are known locally as madora. Imbrasia belina was consumed by more than 90% of the respondents. In the order Isoptera Macrotermes sp. [ishwa] were consumed by more than 80% of the respondents. In the order Coleoptera Eulepida sp, [mandere] and Sternocera orissa [zvigakata] are also widely consumed. In the order Hemiptera only, Encosternum delegorguei [Haruwa] adult is consumed. In the order Homoptera only Loba leopardina [Nyeza nyeza] adult is consumed. In the order Hymenoptera only Carebara vidua [Tsambarafuta] adult is consumed. In the order Orthoptera Brachytrupes membranaceus [Gurwe], Locusta migratoria [mhashu] and Ruspolia differens [Nswabanda] are consumed. Records of quantities of insects harvested are here presented. Protein content of fully grown Imbrasia belina done by the Kjeldahl method was 54-58%. Matebeleland province had the highest tonnage of insects, most of which were exported to other provinces even to neighbouring countries. Manicaland harvested the least quantities of insects. Most of those who consumed insects preferred them in the dried form which were said to have improved organoleptic properties. Drying the insects prolonged their shelf life. Food security strategies for Zimbabwe should include management of harvesting and storage of these insects