ORCID Profile
0000-0003-1552-3763
Current Organisations
University of Nottingham
,
Universitatea Transilvania din Brasov
,
Faculty of Mathematics and Computer Science
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Publications
Study of structures made of composite materials used in automotive industry
Publisher: SAGE Publications
Date: 29-05-2021
DOI: 10.1177/14644207211019767
Abstract: Composite materials are becoming more and more popular in automotive industry since classical materials are, in general, expensive and deficient. This paper presents a study on how metals, used in the construction of car doors, can be successfully replaced by composite materials. The vibration behavior of a car door, made of composite materials, is studied and, since the rigidity of this component is low, a solution is proposed in which the structure is stiffened. The modal analysis and finite element method are used to identify the eigenfrequencies and eigenmodes for this structure.
On stability in the thermoelastostatics of dipolar bodies
Publisher: Springer Science and Business Media LLC
Date: 16-08-2018
Finite element analysis of an elbow tube in concrete anchor used in water supply networks
Publisher: SAGE Publications
Date: 25-08-2019
Abstract: This paper aims to analyze the stress and strain states appearing in the elbow of a tube, such as those commonly used in a city’s water supply network. The stress field is characterized by the fact that there is a significant stress increase when compared to a straight tube. As a result, the strength of such an elbow must be investigated and guaranteed for such a network to be well designed. A practical solution used is to anchor the elbow in a massive concrete block. The paper compares the stress field that occurs in the elbow when it is free, buried in the ground, and when it is anchored in a massive concrete block. Furthermore, we investigate how a crack appears and propagates in the elbow. This happens especially for the elbow buried in the ground where the stress and strain are higher than when the elbow is anchored in concrete. The results obtained can be used in the current practice in the case of water supply networks made by high-density polyethylene pipes.
Some estimates on solutions of mixed problems for mixtures
Publisher: Informa UK Limited
Date: 23-11-2018
Students’ Views towards Sars-Cov-2 Mass Asymptomatic Testing, Social Distancing and Self-Isolation in a University Setting during the COVID-19 Pandemic: A Qualitative Study
Publisher: MDPI AG
Date: 15-04-2021
Abstract: We aimed to explore university students’ perceptions and experiences of SARS-CoV-2 mass asymptomatic testing, social distancing and self-isolation, during the COVID-19 pandemic. This qualitative study comprised of four rapid online focus groups conducted at a higher education institution in England, during high alert (tier 2) national COVID-19 restrictions. Participants were purposively s led university students (n = 25) representing a range of gender, age, living circumstances (on/off c us), and SARS-CoV-2 testing/self-isolation experiences. Data were analysed using an inductive thematic approach. Six themes with 16 sub-themes emerged from the analysis of the qualitative data: ‘Term-time Experiences’, ‘Risk Perception and Worry’, ‘Engagement in Protective Behaviours’, ‘Openness to Testing’, ‘Barriers to Testing’ and ‘General Wellbeing’. Students described feeling safe on c us, believed most of their peers are adherent to protective behaviours and were positive towards asymptomatic testing in university settings. University communications about COVID-19 testing and social behaviours need to be timely and presented in a more inclusive way to reach groups of students who currently feel marginalised. Barriers to engagement with SARS-CoV-2 testing, social distancing and self-isolation were primarily associated with fear of the mental health impacts of self-isolation, including worry about how they will cope, high anxiety, low mood, guilt relating to impact on others and loneliness. Loneliness in students could be mitigated through increased intra-university communications and a focus on establishment of low COVID-risk social activities to help students build and enhance their social support networks. These findings are particularly pertinent in the context of mass asymptomatic testing programmes being implemented in educational settings and high numbers of students being required to self-isolate. Universities need to determine the support needs of students during self-isolation and prepare for the long-term impacts of the pandemic on student mental health and welfare support services.
Experimental study of the valve rotation in a valvetrain car engine
Publisher: SAGE Publications
Date: 06-05-2022
DOI: 10.1177/14644207221097902
Abstract: The rotational motion of the valve during engine operation exists and research presented in this paper has shown that it can have significant importance in the costs related to the operation of the system. The main motion of the valve is an alternating translation along its axis of symmetry, but which is accompanied by an independent rotation around its own axis, possibly due to the constructive shape of the valve. This rotational movement is an important phenomenon with practical applications. The existence of this valve rotation movement has a number of advantages, mainly leading to an increase in the operating period of the valve and implicitly of the engine. An experimental study of the valve rotation is presented in the paper and a comparison with theoretical models is made.
Some results in Moore‐Gibson‐Thompson thermoelasticity of dipolar bodies
Publisher: Wiley
Date: 14-07-2020
Prospective examination of mental health in university students during the COVID-19 pandemic
Publisher: Cold Spring Harbor Laboratory
Date: 31-07-2021
DOI: 10.1101/2021.07.29.21261196
Abstract: The impact of changing social restrictions on the mental health of students during the COVID-19 pandemic warrants exploration. To prospectively examine changes to university students’ mental health during the pandemic. Students completed repeated online surveys at three time points (October 2020 (baseline), February 2021, March 2021) to explore relationships between demographic and psychological factors (loneliness and positive mood) and mental health outcomes (depression, anxiety, and stress). A total of 893 students participated. Depression and anxiety levels were higher at all timepoints than pre-pandemic normative data ( p .001). Scores on all mental health measures were highest in February, with depression and anxiety remaining significantly higher in March than baseline. Female students and those with previous mental health disorders were at greatest risk of poor mental health outcomes. Lower positive mood and greater loneliness at baseline were associated with greater depression and anxiety at follow-ups. Baseline positive mood predicted improvement of depression and anxiety at follow-ups. Depression and anxiety were significantly higher than pre-pandemic norms, with female students and those with previous mental health difficulties being at greatest risk. Given these elevated rates, universities should ensure adequate support is available to meet potentially increased demand for services.
The changing vaccine landscape: rates of COVID-19 vaccine acceptance and hesitancy in young adults during vaccine rollout
Publisher: SAGE Publications
Date: 15-05-2022
DOI: 10.1177/17579139221094750
Abstract: Development and rollout of vaccines offers the best opportunity for population protection against the SARS-CoV-2 (COVID-19) virus. However, hesitancy towards the vaccines might impede successful uptake in the United Kingdom, particularly in young adults who demonstrate the highest rates of hesitancy. This prospective study explored COVID-19 vaccine hesitancy in young adults and whether the reasons behind these attitudes changed during the initial stages of the United Kingdom’s vaccine rollout. Data on vaccination intention were collected from a British university student cohort at three time points: October 2020, February 2021, and March 2021. This online survey included items on intention to receive a vaccine and a free-text response for the reasons behind this intention. Cochran’s Q tests examined changes in rates of hesitancy and acceptance over time and free-text responses were analysed thematically. At baseline, 893 students provided data, with 476 participants completing all three time points. Hesitancy declined over time, with 29.4% of participants expressing hesitancy at baseline, reducing to 9.1% at wave 2 and 5.9% at wave 3. The most commonly endorsed themes for those willing to accept a vaccine were self-protection against COVID-19 and pro-social reasons, including protecting the population or unspecific others, and ending the pandemic/returning to normal life. The most commonly endorsed hesitancy themes related to ‘confidence’ in the vaccines and potential personal risk, including insufficient testing/scientific evidence, concern about side effects, and long-term effects. These reasons remained the most commonly endorsed at both waves 2 and 3. While a decline in hesitancy was observed over time, the key reasons behind both vaccine acceptance and hesitancy remained consistent. Reasons behind hesitancy aligned with those of the general public, providing support for the use of generalist interventions. Pro-social reasons frequently underpinned vaccine acceptance, so cohort-specific interventions targeting those factors may be of benefit.
Experiences of the COVID-19 pandemic: cross-sectional analysis of risk perceptions and mental health in a student cohort
Publisher: Cold Spring Harbor Laboratory
Date: 22-12-2020
DOI: 10.1101/2020.12.21.20248467
Abstract: This study examined the COVID-19 risk perceptions and mental health of university students on returning to c us in the midst of the COVID-19 pandemic. An online survey was completed during the first four weeks of the academic year (October 2020) by 897 university students. The survey included demographics and measures of experiences of COVID-19 testing, self-isolation, shielding, perceived risk, mental health and indices capturing related psychological responses to the pandemic. We observed higher levels of depression and anxiety, but not stress, in students compared with pre- pandemic normative data, but lower than levels reported earlier in the pandemic in other similar cohorts. Depression, anxiety and stress were independently associated with greater loneliness and reduced positive mood. Greater worry about COVID-19 was also independently associated with anxiety and stress. Female students and those with pre-existing mental health disorders were at greatest risk of poor mental health outcomes. Although students perceived themselves at only moderate risk of COVID-19, the prevalence of depression and anxiety among university students should remain a concern. Universities should provide adequate support for students’ mental health during term-time. Interventions to reduced loneliness and worry, and improve mood, may benefit students’ overall mental well-being.
Related Organisations
University Of Sheffield
Location: United Kingdom of Great Britain and Northern Ireland
Open University
Location: United Kingdom of Great Britain and Northern Ireland
University Of Nottingham
Location: United Kingdom of Great Britain and Northern Ireland
Related Funding Activities
No related grants have been discovered for Marin Marin.