bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multivariate small area modelling of undernutrition prevalence among under-five children in Bangladesh
Authors: Guha Saurav , Das Sumonkanti , Baffour Bernard , Chandra Hukum 
Published: May 2022

AbstractDistrict-representative data are rarely collected in the surveys for identifying localised disparities in Bangladesh, and so district-level estimates of undernutrition indicators – stunting, wasting and underweight – have remained largely unexplored. This study aims to estimate district-level prevalence of these indicators by employing a multivariate Fay–Herriot (MFH) model which accounts for the underlying correlation among the undernutrition indicators. Direct estimates (DIR) of the target indicators and their variance–covariance matrices calculated from the 2019 Bangladesh Multiple Indicator Cluster Survey microdata have been used as input for developing univariate Fay–Herriot (UFH), bivariate Fay–Herriot (BFH) and MFH models. The comparison of the various model-based estimates and their relative standard errors with the corresponding direct estimates reveals that the MFH estimator provides unbiased estimates with more accuracy than the DIR, UFH and BFH estimators. The MFH model-based district level estimates of stunting, wasting and underweight range between 16 and 43%, 15 and 36%, and 6 and 13% respectively. District level bivariate maps of undernutrition indicators show that districts in north-eastern and south-eastern parts are highly exposed to either form of undernutrition, than the districts in south-western and central parts of the country. In terms of the number of undernourished children, millions of children affected by either form of undernutrition are living in densely populated districts like the capital district Dhaka, though undernutrition indicators (as a proportion) are comparatively lower. These findings can be used to target districts with a concurrence of multiple forms of undernutrition, and in the design of urgent intervention programs to reduce the inequality in child undernutrition at the localised district level.
Thermally reconfigurable metalens
Authors: Archetti Anna , Lin Ren-Jie , Restori Nathanaël , Kiani Fatemeh , Tsoulos Ted V. , Tagliabue Giulia 
Published: May 2022

Abstract
Reconfigurable metalenses are compact optical components composed by arrays of meta-atoms that offer unique opportunities for advanced optical systems, from microscopy to augmented reality platforms. Although poorly explored in the context of reconfigurable metalenses, thermo-optical effects in resonant silicon nanoresonators have recently emerged as a viable strategy to realize tunable meta-atoms. In this work, we report the proof-of-concept design of an ultrathin (300 nm thick) and thermo-optically reconfigurable silicon metalens operating at a fixed, visible wavelength (632 nm). Importantly, we demonstrate continuous, linear modulation of the focal-length up to 21% (from 165 μm at 20 °C to 135 μm at 260 °C). Operating under right-circularly polarized light, our metalens exhibits an average conversion efficiency of 26%, close to mechanically modulated devices, and has a diffraction-limited performance. Overall, we envision that, combined with machine-learning algorithms for further optimization of the meta-atoms, thermally reconfigurable metalenses with improved performance will be possible. Also, the generality of this approach could offer inspiration for the realization of active metasurfaces with other emerging materials within field of thermo-nanophotonics.
High dimensional threshold model with a time-varying threshold based on Fourier approximation
Authors: Yang Lixiong 
Published: May 2022

Abstract
This paper studies high-dimensional threshold models with a time-varying threshold approximated using a Fourier function. We develop a weighted LASSO estimator of regression coefficients as well as the threshold parameters. Our LASSO estimator can not only select covariates but also distinguish between linear and threshold models. We derive non-asymptotic oracle inequalities for the prediction risk, the l
1 and l
∞ bounds for regression coefficients, and provide an upper bound on the l
1 estimation error of the time-varying threshold estimator. The bounds can be translated easily into asymptotic consistency for prediction and estimation. We also establish the variable selection consistency and threshold detection consistency based on the l
∞ bounds. Through Monte Carlo simulations, we show that the thresholded LASSO works reasonably well in finite samples in terms of variable selection, and there is little harmness by the allowance for Fourier approximation in the estimation procedure even when there is no time-varying feature in the threshold. On the contrary, the estimation and variable selection are inconsistent when the threshold is time-varying but being misspecified as a constant. The model is illustrated with an empirical application to the famous debt-growth nexus.
Hereditary Leiomyomatosis and Renal Cell Cancer-Recognizing Patterns May Save Lives
Authors: Tavares Catarina , Quental Maria Sofia , Brandão José Ricardo , Silva-Ramos Miguel 
Published: May 2022

In 2001, Finish investigators described a rare familiar syndrome characterized by an inherited susceptibility to cutaneous leiomyomas, uterine leiomyomas, and renal cell carcinoma (RCC). Hereditary leiomyomatosis and renal cell cancer (HLRCC) is now linked to a germline mutation in the fumarate hydratase (FH) gene that encodes a Krebs cycle enzyme, transforming fumarate to malate. The accumulation of fumarate, an oncometabolite, promotes tumorigenesis. We present a case of a 41-year-old female diagnosed with HLRCC after a radical nephrectomy due to renal cell cancer. Genetic analyses confirmed a novel FH mutation. Close follow-up allowed for a precocious diagnosis of a metachronous renal tumor and later a hepatic metastasis. Her family was also counseled and offered genetic testing. As observed in this case, the diagnosis of HLRCC is of paramount importance for patients and their families: there is a 15% cumulative lifetime risk of developing RCC, which frequently occurs in young patients and metastasizes at an early stage. Implementing a regular follow-up with adequate imaging examinations may help save lives.
Ordinal Maximin Share Approximation for Goods
Authors: Hosseini Hadi , Searns Andrew , Segal-Halevi Erel 
Published: May 2022

In fair division of indivisible goods, ℓ-out-of-d maximin share (MMS) is the value that an agent can guarantee by partitioning the goods into d bundles and choosing the ℓ least preferred bundles. Most existing works aim to guarantee to all agents a constant fraction of their 1-out-of-n MMS. But this guarantee is sensitive to small perturbation in agents' cardinal valuations. We consider a more robust approximation notion, which depends only on the agents' ordinal rankings of bundles. We prove the existence of ℓ-out-of-⌊(ℓ + 1/2)n⌋ MMS allocations of goods for any integer ℓ ≥ 1, and present a polynomial-time algorithm that finds a 1-out-of-⌈3n/2⌉ MMS allocation when ℓ=1. We further develop an algorithm that provides a weaker ordinal approximation to MMS for any ℓ > 1.
Poikilocytotic forms caused by hyperthermia and heat stroke- experimental study on Wistar rats
Authors: Dervisevic Emina , Katica Muhamed , Hasić Sabaheta , Jogunčić Anes , Dervišević Lejla , Vukas Haris , Salihbegović Adis 
Published: May 2022

Background: The aim of the study was to find out what happens to erythrocytes and their forms during life and after death as a result of high water temperature.Methods: Heat stress was used on a rat model.to investigate the effects of different temperature intensities (37°C and 44°C) and exposure time (20 min and until the time of death) on erythrocyte morphology. Total of 23 Wistar rats were divided into two groups: 37°C as control group and 44°C as trial groups. The trial groups were classified into antemortem the exposure time of 20 min and postmortem groups exposure time until fatal outcome. The anaesthetised rats were exposed to preheated water using the water bath. May-Grünwald-Giemsa colouring technique was applied on blood samples taken from the abdominal aorta. Results: Exposure of Wistar rats to water temperature in groups KG37 and G44 led to a significant changes in core temperature. In the control group, the thermoregulatory mechanism established normothermia, and in G44 hyperthermia was detected during 20 minutes of exposure. The frequency of heat stroke in group G44 was 43.8%. Target cells and anulocytes were predominant in antemortem group at 44°C, while anulocytes and spherocytes in postmortem groups 44°C, respectively. Dacryocytes with spherocytes were significantly higher in postmortem group 44°C than in antemortem group 44°C (p=0.002, p=0.017, respectively).Conclusions: Poikilocytosis is associated with the exposure length and temperature intensity. Following a fatal outcome dacryocytes with spherocytes at 44°C were significantly more than in corresponding antemortem groups.
Prevalence of mismatch repair mutations in colorectal carcinoma patients in Mangalore
Authors: Nair Vineeth G , Shariff M H 
Published: May 2022

Colorectal cancer (CRC) is highly prevalent throughout the world and represents the 3rd most common cancer in men and the 2nd in women worldwide. Microsatellite instability (MSI) is a term used to denote a hypermutable phenotype caused by the loss of DNA mismatch repair (MMR) activity, and is a phenomenon now linked to the pathways of colorectal carcinogenesis. Compounding its importance is its integral association with Lynch syndrome, the most common cause for CRCs in young individuals. In the present study, we aimed to analyse the proportion of patients with risk of microsatellite instability by checking for loss of immunostaining for mismatch repair (MMR) proteins.From January 2016 to December 2016 and May 2017 to October 2017, 40 consecutive newly diagnosed cases of colorectal cancer were included in the study. The expression of MMR proteins in the tumour tissue using IHC for MSH2, MSH6, MLH1 and PMS2 was studied.Among the 40 cases, 3 (7.5%) demonstrated loss of MMR proteins and 37 (92.5%) cases had intact nuclear expression. Out of the three cases with MMR loss, one showed concurrent loss of MLH1 and PMS2, the second showed concurrent loss of MSH2 and MSH6 and the third showed an isolated loss of MSH6.Colorectal carcinomas showing MMR mutations are seen in the Mangalorean population. However, the incidence in our study was relatively low compared to most other studies, probably due to a variation in ethnicity.
Papillary thyroid carcinoma of the Warthin like type, a rare variant: A case report
Authors: Akioud Fatima , Abainou Lhoussaine , El-hadri Sanaa , Idrissi Ayoub , Belaabidia Badia , Azami Amine , Meftah Azzelarab , Baizri Hicham 
Published: May 2022

The Warthin-like variant is a rare and relatively unknown entity of papillary thyroid carcinoma. It is frequently associated with Hashimoto's thyroiditis. The cytologic diagnosis is difficult to evaluate because of the overlap of its findings with the classic variant and Hashimoto's thyroiditis. However, this variant has unique morphologic features that make it easily recognizable on histologic examination. These tumors have a resemblance to Warthin's tumor of salivary gland origin.The few case series reported in the literature have suggested that the mean age, sex distribution, circumstances of discovery, and prognosis are the same as those reported for classic papillary thyroid carcinoma.We report here a case of Warthin like variant papillary thyroid carcinoma in a 42-year-old female patient followed for Hashimoto's thyroiditis.
The Effectiveness of Acceptance and Commitment Therapy (ACT) on Anxiety and Self-efficacy of Children: A Single-Case Experimental Design
Authors: Nekooei Somayeh , Abbaspour Zabihollah , Koraei Amin 
Published: May 2022

Aim: The aim of the current study was to investigate the effectiveness of Acceptance and Commitment Therapy (ACT) on Anxiety and Self-efficacy of children among children with anxiety. Methods: The statistical population consisted of all children diagnose with anxiety in Ahvaz. The research sample consisted of 3 children that were selected according to the results of the Child Anxiety Related Emotional Disorders (SCARED) , using purposeful sampling method. In this research, a single-case experimental design, type of non-concurrent multiple baseline designs was used. To evaluate the anxiety, Child Anxiety Related Emotional Disorders (SCARED) and self-Efficacy - Children's Self-Efficacy Scale were used. The data was collected in three phases of baseline, during intervention, and one month follow-up. Findings: The findings indicate that the subjects in the treatment phase experienced improvement in anxiety (30/96) and self-efficacy (28/13), and in the follow-up in regards to anxiety (38/44) and self-efficacy (32/25). The change index was indicative of meaningful changes (z=1/95 α=0.05). Conclusion: Therefore, the research findings illustrated that Acceptance and Commitment Therapy reduces anxiety and increases children's self-efficacy by increasing psychological flexibility and reducing dysfunctional reactions.
Investigating the Mediating Role of Identity Crisis and Family Cohesion in Determining the Relationship between Social Networks Participation with Body Image Issues Among Students
Authors: Nemati Fatemeh , Boland Hasan , Sayadi Ali 
Published: May 2022

Aim: The aim of present study was to investigate the mediating role of identity crisis and family cohesion in determining the relationship between participation in social media and body image concerns among students. Methods: The present study was a descriptive correlational study. The statistical population consisted of all public middle school students studying in the city of Rasht in the academic year of 2019-20. Participants were selected using multi-stage cluster random sampling method. To collect data from four questionnaires, Social Network Sites Engagement Scale (Boland1399), Identity Crisis (Ahmadi, 1997), Family Cohesion (Samani, 2002) and Body Image Concern Questionnaire (Littleton et al., 2005) were used. These questionnaires were provided to students online and 674 people responded to them. Finally, 497 questionnaires were examined and analyzed statistically, using path analysis method. Findings: The results showed that social network engagement has a direct effect on body image concern (β=-0.41, P<0.001), family cohesion (β=-0.25, P <0.001), and identity crisis (Β=-0.16, P<0.001). Identity crisis directly and significantly predicts body image concerns (β=-0.13, P<0.001). Family cohesion directly and significantly predicts body image concerns (β=-0.17, P<0.001). In addition,that engagement in social networks mediated by identity crisis has an indirect impact on body image anxiety (β=0.06, P<0.001). However, the indirect effect of the mediating variable of family cohesion on social network engagement and body image concerns is not statistically significant. Conclusion: Therefore, improving the amount and manner of adolescents' use of social networks, teaching media literacy to adolescents and holding training sessions to facilitate the transition from puberty and prevent identity crisis is important to reduce dissatisfaction with body image and promote adolescent mental health.
A comparative analysis of the first cycle degree programmes in business in Turkey in terms of the number of course units and the student workloads
Authors: Sarıgül Haşmet , Şengelen Hakan Eren 
Published: May 2022

This comparative study aims to determine the differences between the curricula of the first cycle degree programmes in business in Turkey in terms of the number of course units and the student workloads. In this context, (1) the courses included in the Bologna course information packages of business schools on their web sites have been examined; (2) course units have been gathered together in content–related groups, (3) the numbers of course units in each content–related group have been determined, (4) total student workload of each content–related group has been determined by means of the institutionally allocated ECTS credits, (5) the differences between public and foundation business schools have been tested for each content–related group in terms of total number of course units and total student workload, and (6) the differences between the business schools using Turkish and those using a foreign language as the medium of instruction have been tested for each content–related group in terms of total number of courses and total student workload. The methods used in the research are document review and multivariate analysis. The data of 147 business schools has been used in the study and the outputs of the research reveal that there are significant differences in most of the content–related groups between both the business school groupings described above at points (5) and (6) in terms of the number of course units and student workload.
Received: 9 October 2020Accepted: 22 April 2022
UAE-based first-year university students’ perception of lifelong learning skills affected by COVID-19
Authors: Deveci Tanju 
Published: May 2022

Forcing education institutions to rely on online learning exclusively, the recent pandemic has brought lifelong learning (LLL) to the forefront. The effects of the recent education approaches on students’ LLL skills merit investigation. First-year students may be at a greater risk because of their limited tertiary education experience and universities’ expectations for them to engage in self-directed learning. This study investigated how 38 UAE-based first-year students thought COVID-19 impacted their LLL skills. The quantitative data were collected using a scale while the qualitative data were collected using a reflective task. The results revealed that the students’ overall high score from the scale prior to the pandemic remained stable nine months into it despite a significant decrease in the adaptable learning strategies sub-scale. Yet, some students’ overall LLL scores increased significantly. The qualitative data showed that these students thought they solidified their skills in learning strategies and plans. However, the female students reported a decrease in goal-setting score. Taken together, the results indicate that LLL skills help students reduce the negative impacts of COVID-19 on learning; yet it is still important to note the reducing impact of the pandemic on some students’ skill in adapting learning strategies and setting goals. The results also indicate that LLL skills are malleable and educators can help enhance students’ LLL skills.
Received: 20 April 2021Accepted: 20 April 2022
Emergency remote education: A perspective of its potentialities and limitations in a Peruvian university
Authors: Barrutia Barreto Israel , Patricio Aparicio Santiago Saturnino 
Published: May 2022

This research aims to identify the potentialities and limitations of emergency remote education in the Peruvian university context as a consequence of the COVID-19 pandemic based on teachers’ experience of the Hermilio Valdizán National University (UNHEVAL). The type of this research was descriptive and the sample consisted of 123 teachers of the academic period 2020-I. For the data collection, a questionnaire was used, whose validation was made through the judgment of experts (0.96) and the reliability of the results through the Z-test. According to the results, flexibility stands out between the potentialities in regards to topics’ distribution, time, and the possibility to produce greater interest in the participants. It was observed that time flexibility is not considered as favorable unlike what was detected through literature. Infrastructure stands out, especially when is related to the connectivity and Internet access as well as the distractors produced by the easy access to devices and applications that are not related to the class session. The paper revealed weakness in the digital competencies of both teachers and students, and the scarce level of social interaction caused by social isolation. It is concluded that the potentialities and limits of emergency remote education in a Peruvian university are conditioned by different elements specific to each context or country and must be considered for the production of new educational proposals as a policy of prevention of the possibility of new events that require mandatory isolation.
Received: 1 July 2021Accepted: 19 April 2022
Factors influencing postgraduate students’ intention to use learning management system
Authors: Samaila Kamaludeen , Khambari Mas Nida Md. , Kumar Jeya Amantha , Masood Mona 
Published: May 2022

Learning management systems (LMS) are continuously being implemented in tertiary institutions to manage and strengthen educational activities. LMS such as Moodle facilitates the management of learning content, collaboration, and communication. However, there have been limited studies examining factors influencing postgraduate students’ intention to use LMS in Malaysian universities, as studies mainly concentrate on undergraduates’ use intentions. Therefore, this study investigates factors influencing the behavioural intention to use LMS based on the Unified Theory of Acceptance and Use of Technology (UTAUT) model. The results indicated performance expectancy (PE) followed by social influence (SI) and effort expectancy (EE) as the factors influencing the behavioural intention (BI) to use LMS. Concurrently, facilitating conditions (FC) were found not to influence BI, and we denote that socio-economy standings and maturity influence their overall acceptance of the LMS. Practical and theoretical implications are discussed accordingly.
Received: 13 August 2021Accepted: 11 April 2022
Virtual education during COVID-19 in higher education: A systematic review
Authors: Torres-Caceres Fatima del Socorro , Méndez-Vergaray Juan , Rivera-Arellano Edith Gissela , Ledesma-Cuadros Mildred Jénica , Huayta-Franco Yolanda Josefina , Flores Edward 
Published: May 2022

The objective of the present systematic review aimed to analyze studies linked to online teaching-learning, digital competence tutoring, and technological tools in virtual education during COVID-19 in higher education. The suggested methodology by the PRISMA declaration was pursued; the information search was conducted in Scopus, EBSCO, Springer Open, ProQuest, and One File. The target period ranged from May 10, 2021, to July 4, 2021; the identification, screening, eligibility, and inclusion for its progress were performed. The search produced a total of 230 studies, with 45 remaining. The inclusion criteria included original peer-reviewed research articles and qualitative and quantitative studies in higher education, comprising teachers and students addressing the study objective. In contrast, the exclusion criteria covered bibliographic reviews with procedural deficiencies, studies not exposed to a peer review process, and those not depicting a relationship with parts of the study. The results reveal that online teaching-learning, digital competence tutoring, and technological tools have been affirmative features expected to persist in higher virtual education engendered by the COVID-19 pandemic.
Received: 5 October 2021Accepted: 22 April 2022