Cyprus University of Technology
Recent publications
As space exploration programs around the world continue with accelerated plans for planetary robotic missions and human expeditions to Mars, the Moon, and beyond, laying the groundwork for even more complex human science expeditions, the need for spacecraft to land safely on planetary surfaces has become increasingly challenging because of the use of massive and hauling larger payloads required to accommodate the extended stays on the Martian and Lunar surface. Advances in supersonic decelerator technology investigates re-entry vehicle designs that evaluate reliable techniques for safe planetary atmospheric re-entry. Decelerator design engineers are investigating the use atmospheric drag as a solution to save rocket engines and fuel for final manoeuvres and landing procedures. The heavier planetary landers of tomorrow will require much larger drag devices use to slow them down during re-entry deployed at higher supersonic speeds to safely land vehicle, crew, and cargo. Aerial entry, descend, and landings system model validation and verification are an area in the aerodynamic decelerator community that is constantly growing and innovating.
Conventional protection schemes have essentially been developed for power systems dominated by synchronous generators. High penetration of power-electronic interfaced renewable energy sources (PEIRESs) can adversely impact the reliability of protection systems, thereby increasing the risk of widespread disturbances. This paper proposes a robust wide-area backup protection (WABP) scheme against asymmetrical faults for transmission systems with high penetration of renewables. The scheme exploits the full potential of available synchrophasors without placing any rigid constraints on PMU locations. To this end, the faulted line and a few appropriately selected PEIRESs are replaced by equivalent current sources using the Substitution Theorem. The remaining PEIRESs are substituted by their equivalent impedances accounting for their response to a fault, considering the control strategies and overcurrent limits of these PEIRESs. This results in a linear system of equations whose solution readily indicates the faulted line on account of the weighted sum of squared residuals (WSSR) concept. To add to the security of the proposed scheme, the fault distance on the pinpointed line is also calculated and checked to ensure it lies within the acceptable range. A total of more than 80,000 simulations conducted on the IEEE 39-bus test system verify that the proposed scheme performs properly irrespective of the numbers/locations of PEIRESs and their control strategies.
The purpose of this study is to explore the extent to which intelligent automation (IA) should be used to provide the best possible service quality and experience to customers, an area that needs further exploration. The study draws on an inductive qualitative inquiry from the supply side which has been rather overlooked despite its significant role in designing and shaping experiences. The data were gathered by conducting a total of 39 semi-structured interviews with tourism service providers in Cyprus. The findings revealed insightful information regarding human-IA tasks and interaction from a tourism provider perspective while stressing the cooperation between humans and IA within a service context. The importance of the human element, individual characteristics and key human capabilities are particularly stressed within a continuous digitally transformative industry. The paper concludes with theoretical contributions in regard to the experiential theoretical milieu, practical implications, and future research directions.
This paper examines the reasons why large quantities of unconsumed food are wasted in the Cypriot hotel industry, and makes suggestions for the reduction of this wastage. The research focuses on hotels located in the town of Limassol. The paper aims to provide solutions for hotel food not to be wasted if not consumed by customers. It also examines whether hoteliers simply are not interested in reducing food waste, or whether there are implications that restrict them from doing so. The importance of this paper is that it deals with food waste in the hotel industry from the supply side (hoteliers/hotel owners and hotel managers) rather than the demand side (hotel customers). The paper uses qualitative methods (interviews) and literature review to examine the aforementioned issues. The paper also investigates whether the biggest food bank/charity organisation in the town of Limassol could collaborate with hotels for excess food to be donated to the town’s hungry citizens. It concludes that although there are ways for food not to go to waste in the hotel industry, certain barriers must be overcome.
Hydrogen is a clean and efficient energy carrier, and a hydrogen-based economy is an alternative solution for sustainability. The present work reviews the recent progress for hydrogen's production from various technologies including the generation from fossil fuels, from biomass through biological and thermochemical processes and from water splitting. Although hydrogen is a zero-emission energy when it is used, its cleanness depends on the production pathway that preceded. Hydrogen's storage and transportation has been costly and an unsafe procedure; formic acid (FA; CH2O2), on the other hand, can be generated, transported, and decomposed easily to hydrogen. Formic acid is generated from the hydrogenation of atmospheric carbon dioxide (CO2) and can easily be provided with energy portable devices, vehicles, and other applications. In addition, the most widely known homogeneous and heterogeneous catalysts and reactors for the formic acid reaction are presented. Different types of reactors like, fixed-bed reactors (FBRs), batch reactors, continuously stirred tank reactors (CSTRs) and microreactors were assessed for their performance and reaction's efficiency during formic acid’s decomposition.
Electronic waste (e-waste) has become one of the major causes of environmental concerns due to its large volume, high generation rate and toxic environmental burdens. Recent estimates put e-waste generation at about 54 million tonnes per annum with figures reaching approximately 75 million tonnes per annum by 2030. In this manuscript, the state-of-the-art technologies and techniques for segregation, recovery and recycling of e-waste with a special focus on the valorisation aspects of e-plastics and e-metals which are critically reviewed. A history and insight into environmental aspects and regulation/legislations are presented including those that could be adopted in the near future for e-waste management. The prospects of implementing such technologies in the State of Kuwait for the recovery of materials and energy from e-waste where infrastructure is lacking still for waste management are presented through Material Flow Analysis. The information showed that Kuwait has a major problem in waste accumulation. It is estimated that e-waste in Kuwait (with no accumulation or backlog) is generated at a rate of 67,000 tpa, and the imports of broadcasting electronics generate some 19,428 tonnes. After reviewing economic factors of potential recovered plastics, iron and glass from broadcasting devices in Kuwait as e-waste, a total revenue of $399,729 per annum is estimated from their valorisation. This revenue will open the prospect of ventures for other e-waste and fuel recovery options as well as environmental benefits and the move to a circular economy.
More than a year after the introduction of vaccines against COVID-19, inoculation remains inconsistent and variable across countries. In this paper, we introduce a multi-item scale of COVID-19 related misinformation, skepticism, and conspiracy theories and investigate the effects of these beliefs on vaccine hesitancy. We report findings from a survey in Greece where participants were recruited via paid advertising on Facebook and the study sample was adjusted for demographic variables using a nationally representative reference sample. We show that the endorsement of COVID-19 conspiracy beliefs is the primary factor driving vaccine hesitancy, far exceeding the effect of all other demographic and attitudinal variables, including health status. Furthermore, a pre-registered randomized survey experiment showed that the effect cannot be attributed to respondents’ exposure to the COVID-19 conspiracy theory questions of the survey. The paper concludes by discussing potential public policy implications for combating misinformation and promoting health literacy among social media users.
Background Modern protocols for light sedation in combination with the increased number of COVID-19 infected patients hospitalized in Intensive Care Units (ICUs) have increased the number of patients who are mechanically ventilated and awake. Nurses require specific skills to care for this vulnerable group of patients. At the same time, nurses report feeling inadequate and frustrated when they attempt to establish communication with mechanically ventilated, conscious patients. Study objectives The purpose of this study was to explore the strategies nurses use when taking care of conscious, intubated patients in the intensive care unit and the barriers they encounter in their effort to communicate. Methods For this study, a qualitative design was employed. Data were collected using in-depth semi-structured interviews with 14 intensive care nurses working at ICUs in four different hospitals of Cyprus. The data were analyzed by applying thematic analysis. Results We identified several strategies of unaided (movements—lips, hands, legs—facial expressions, gestures, touching) and aided forms of communication (pen and paper, boards, tablets, mobiles) used by nurses to communicate with patients. However, barriers to communication were reported by the participating nurses mainly pertaining to patients and nurses’ characteristics as well as the ICU environment. The health protocols imposed by the pandemic added more obstacles to the communication between nurses and patients mostly related to the use of protective health equipment. Conclusions The results of this study point to the difficulties nurses in Cyprus face when trying to communicate with conscious patients during mechanical ventilation. It appears that the lack of nurses’ training and of appropriate equipment to facilitate augmentative and alternative communication leave the complex communication needs of critically ill patients unaddressed. However, further research including patients’ opinions, after they recover, would bring more clarity on this topic. Our study adds evidence to the communication crisis created by the protective health protocols imposed by the pandemic. As such, it highlights the need to educate nurses in augmentative and alternative ways of communication to address communication with mechanically ventilated, conscious patients during their ICU stay.
Introduction Meeting spiritual needs is an important part of the quality of nursing for older people living with dementia. The spirituality-supportive caring and living environment has rarely been studied, even though the environment plays an important role in supporting the well-being of older people with dementia. Aim To further understanding about the spirituality-supportive elements of a caring and living environment from the perspective of older people with dementia and their family members. Design, setting and participants We adapted hermeneutic phenomenology as a philosophical background and methodological approach in this study. After receiving the approval of the researcher's University Ethics Committee, a purposive sample of ten older people with dementia and their nine family members, in home care and long-term care settings in Southern Finland were recruited for interviews. Methods An interview-based study was conducted using photography to collect the data. The in-depth interviews were conducted in dyads between September 2017 and March 2020 and transcribed verbatim. Thematic analysis was used to interpret the data. Results Spirituality was seen as a continuum within human life, manifested through the environment even if older people with dementia were unable to express themselves. The spirituality experiences of the participants within the caring and living environment were summarized into three themes: “Where do I belong?”, “What remains of me in the world?” and “Where am I going?” The older people, their family members and other people involved in their care provided a caring and living environment that supported spirituality with opportunities to seek answers to these questions through to the meaning of their life. Discussion and conclusions This hermeneutic phenomenological study provides a new insight into the environment that supports the spirituality of older people with dementia. The elements of caring and living environment can remind older people with dementia of what supports their own way of thinking about spirituality and brings meaning to their life. Therefore, spirituality is worth of considering when planning a caring and living environment that supports what is important to the personhood of older people with dementia. Tweetable abstract Spirituality is worth of considering when planning a caring and living environment that supports what is important to the personhood of older people with dementia.
To date, the evidence regarding the effect of bilingualism/multilingualism on short-term memory (STM) and working memory (WM) capacity is inconclusive. This study investigates whether multilingualism has a positive effect on the verbal STM and WM capacity of neuro-typical middle-aged and older individuals. Eighty-two L1-Norwegian sequential bilingual/ multilingual academics were tested with tasks measuring verbal STM/WM capacity. Degree of bilingualism/multilingualism for each participant was estimated based on a comprehensive questionnaire. Different measures of bilingualism/multilingualism were used. Data on potentially influencing non-linguistic factors were also collected. Correlation and regression analyses showed that multilingualism impacts both verbal STM and verbal WM. In particular, all analyses showed that number of known foreign languages was the strongest predictor of verbal STM and WM capacity. The results are discussed in light of recent studies on the impact of bilingualism on STM/WM and on recent proposals regarding the mechanism underlying so-called bilingual advantage.
Despite the exponential growth of crowdfunding in recent years, research on the role it plays in business internationalization is still embryonal. Building on the Resource Based View (RBV) and Knowledge Based View (KBV), this study explores how SMEs can use equity crowdfunding (ECF) and reward crowdfunding (RCF) to internationalize and the related potential limitations. Using an inductive qualitative research design, based on multiple case studies of Italian SMEs, our study showed that ECF and RCF models help SMEs in acquiring the financial resources needed to internationalize and, at the same time, offer significant added value to their internationalization. Our findings support the idea that ECF and RCF play a key role in helping companies to overcome their resource limitations in regard to internationalization, not only in terms of the provision of financial resources but, above all, by compensating for any lack of knowledge on aspects relevant to the internationalization process. Furthermore, our results show the limitations of SMEs use of crowdfunding in order to internationalize (i.e., a lack of ad hoc e-commerce policies in relation to equity crowdfunding and to the regulation of the pre-ordering mechanism in the reward model). This paper concludes by discussing the theoretical and managerial contributions to the international business domain, and highlighting fruitful avenues for future studies.
Throughout its whole history, most research conducted in language assessment refers to testing. It is only since 2000 that language formative assessment started being recorded in research publications. This book tells the story of language formative assessment in two ways, the one complementing the other: in the forms of a systematic review and a descriptive and evaluative annotated bibliography, from the very first published work on the subject in 2000 to 2020. While the systematic review gives the story of language formative assessment in a chronological order and gives an overview of different aspects, the annotated bibliography gives more details for research work published. Τhe main purposes of the book are to (1) give a substantial background in the area, (2) describe how this topic has been approached, (3) contribute to the development of critical thinking, (4) help in establishing the relevance and quality of the annotated material, and (5) facilitate language formative researchers as well as practitioners to form an overview of the research in the area during the specific period under study. The book may be of interest to language practitioners, researchers, teacher trainers, and policy makers. The authors hope that the present publication will be viewed as a valuable contribution to the history of language formative assessment.
Throughout its whole history, most research conducted in language assessment refers to testing. It is only since 2000 that language formative assessment started being recorded in research publications. This book tells the story of language formative assessment in two ways, the one complementing the other: in the forms of a systematic review and a descriptive and evaluative annotated bibliography, from the very first published work on the subject in 2000 to 2020. While the systematic review gives the story of language formative assessment in a chronological order and gives an overview of different aspects, the annotated bibliography gives more details for research work published. Τhe main purposes of the book are to (1) give a substantial background in the area, (2) describe how this topic has been approached, (3) contribute to the development of critical thinking, (4) help in establishing the relevance and quality of the annotated material, and (5) facilitate language formative researchers as well as practitioners to form an overview of the research in the area during the specific period under study. The book may be of interest to language practitioners, researchers, teacher trainers, and policy makers. The authors hope that the present publication will be viewed as a valuable contribution to the history of language formative assessment.
Throughout its whole history, most research conducted in language assessment refers to testing. It is only since 2000 that language formative assessment started being recorded in research publications. This book tells the story of language formative assessment in two ways, the one complementing the other: in the forms of a systematic review and a descriptive and evaluative annotated bibliography, from the very first published work on the subject in 2000 to 2020. While the systematic review gives the story of language formative assessment in a chronological order and gives an overview of different aspects, the annotated bibliography gives more details for research work published. Τhe main purposes of the book are to (1) give a substantial background in the area, (2) describe how this topic has been approached, (3) contribute to the development of critical thinking, (4) help in establishing the relevance and quality of the annotated material, and (5) facilitate language formative researchers as well as practitioners to form an overview of the research in the area during the specific period under study. The book may be of interest to language practitioners, researchers, teacher trainers, and policy makers. The authors hope that the present publication will be viewed as a valuable contribution to the history of language formative assessment.
Throughout its whole history, most research conducted in language assessment refers to testing. It is only since 2000 that language formative assessment started being recorded in research publications. This book tells the story of language formative assessment in two ways, the one complementing the other: in the forms of a systematic review and a descriptive and evaluative annotated bibliography, from the very first published work on the subject in 2000 to 2020. While the systematic review gives the story of language formative assessment in a chronological order and gives an overview of different aspects, the annotated bibliography gives more details for research work published. Τhe main purposes of the book are to (1) give a substantial background in the area, (2) describe how this topic has been approached, (3) contribute to the development of critical thinking, (4) help in establishing the relevance and quality of the annotated material, and (5) facilitate language formative researchers as well as practitioners to form an overview of the research in the area during the specific period under study. The book may be of interest to language practitioners, researchers, teacher trainers, and policy makers. The authors hope that the present publication will be viewed as a valuable contribution to the history of language formative assessment.
Digital technologies have brought changes to the nature and scope of education and led education systems worldwide to adopt strategies and policies for ICT integration. The latter brought about issues regarding the quality of teaching and learning with ICTs, especially concerning the understanding, adaptation, and design of the education systems in accordance with current technological trends. These issues were emphasized during the recent COVID-19 pandemic that accelerated the use of digital technologies in education, generating questions regarding digitalization in schools. Specifically, many schools demonstrated a lack of experience and low digital capacity, which resulted in widening gaps, inequalities, and learning losses. Such results have engendered the need for schools to learn and build upon the experience to enhance their digital capacity and preparedness, increase their digitalization levels, and achieve a successful digital transformation. Given that the integration of digital technologies is a complex and continuous process that impacts different actors within the school ecosystem, there is a need to show how these impacts are interconnected and identify the factors that can encourage an effective and efficient change in the school environments. For this purpose, we conducted a non-systematic literature review. The results of the literature review were organized thematically based on the evidence presented about the impact of digital technology on education and the factors that affect the schools’ digital capacity and digital transformation. The findings suggest that ICT integration in schools impacts more than just students’ performance; it affects several other school-related aspects and stakeholders, too. Furthermore, various factors affect the impact of digital technologies on education. These factors are interconnected and play a vital role in the digital transformation process. The study results shed light on how ICTs can positively contribute to the digital transformation of schools and which factors should be considered for schools to achieve effective and efficient change.
PurposeTissue-mimicking materials (TMMs) have a prominent role in validating new high intensity focused ultrasound (HIFU) therapies. Agar-based TMMs are often developed mimicking the thermal properties of muscle tissue, while TMMs simulating fat tissue properties are rarely developed. Herein, twelve agar-based TMMs were iteratively developed with varied concentrations of agar, water, glycerol and propan-2-ol, and characterized for their suitability in emulating the thermal conductivity of human fat tissue.Methods Varied agar concentrations (2%, 4%, 6%, 8%, 12%, 16% and 20% w/v) were utilized for developing seven water-based TMMs, while a 20% w/v agar concentration was utilized for developing two water/alcohol-based TMMs (50% v/v water and 50% v/v either glycerol or propan-2-ol) and three alcohol-based TMMs (varied glycerol and propan-2-ol concentrations). Thermal conductivity was measured for all TMMs, and the tissue mimicking material (TMM) exhibiting thermal conductivity closest to human fat was considered the optimum fat TMM and was further characterized using ultrasound (US) and Magnetic Resonance Imaging (MRI).ResultsFor the seven water-based TMMs an inverse linear trend was observed between thermal conductivity and increased agar concentration, being between 0.524 and 0.445 W/m K. Alcohol addition decreased thermal conductivity of the two water/alcohol-based TMMs to about 0.33 W/m K, while in the alcohol-based TMMs, increased concentrations of propan-2-ol emerged as a modifier of thermal conductivity. The optimum fat TMM (33.3% v/v glycerol and 66.7% v/v propan-2-ol) exhibited a 0.231 W/m K thermal conductivity, and appeared hypoechoic on US images and with increased brightness on T1-Weighted MRI images.Conclusion The optimum fat TMM emulates the thermal conductivity of human fat tissue and exhibits a fat-like appearance on US and MRI images. The TMM is cost-effective and has a long lifespan and possesses great potential for use in HIFU applications as a fat TMM.
The potential of using pre-stress NaCl or CaCl2 applications to confer a cross-tolerance to a water deficit was evaluated in periwinkle. The plants initially received five applications of NaCl (0, 30 and 50 mM), or CaCl2 (15 and 25 mM) via irrigation, and then they were cultivated under different water deficit regimes (80, 50 and 20% available water content). The water deficit induced smaller and denser stomata. It promoted a water use efficiency, a proline content and antioxidant enzyme activity. However, it downgraded the aesthetic value (plant stature, flower size and vegetation greenness), magnified the stem bending probability and strongly decreased the floral longevity. It additionally impeded the growth by reductions in the leaf area and photosynthesis. Plants undergoing a water deficit maintained a lower hydration and expressed oxidative damage symptoms, including enhanced chlorophyll and membrane degradation. As the water deficit intensified, these effects were more pronounced. Pre-stress CaCl2 or NaCl applications generally restored most of the water severity-induced effects, with the former being more effective. For CaCl2 , the highest concentration (25 mM) was generally optimal, whereas NaCl was the lowest concentration (30 mM). In conclusion, pre-stress CaCl2 or NaCl applications effectively confer a cross-tolerance to the water deficit by promoting the aesthetic value and extending the floral longevity, with the promotive effects being incremental as the water deficit becomes more severe.
The urban overheating phenomenon in Mediterranean cities is a societal challenge with vast implications for the protection of public health. An additional analysis of the pilot TEMP randomized 2 × 2 cross-over trial was set up, using wearable sensor-based skin temperature measurements (n = 14). The study objectives were to: (i) assess the recurrence patterns of skin temperature measurements in individuals spending time in two climatologically contrasting settings (urban versus mountainous), and (ii) evaluate the association between the diurnal nonlinear recurrence quantification analysis (RQA) metrics and metabolic hormone levels. The intervention was a short-term stay (5–7 days) in a mountainous, climate-cooler setting (range 600–900 m altitude), which is about a 1 h drive from the main urban centres of Cyprus. The RQA analysis showed a blunting phenomenon on the nonlinear temporal dynamics of skin temperature time series observed in the urban setting. Compared with the mountainous setting, a more stable (and thus less adaptive) profile of skin temperature dynamics in the urban setting appeared, being less deterministic and with a smaller degree of complexity. No significant (p > 0.05) associations were observed between the leptin or cortisol and any of the skin temperature dynamical descriptors. However, there were marginal associations between the adiponectin and laminarity (beta = 0.24, 95%CI: −0.02, 0.50, p = 0.07) and with determinism (beta = 0.23, 95%CI: −0.037, 0.50, p = 0.09). We found dysregulations in skin temperature temporal dynamics of the study population while residing in the urban setting when compared with the cooler mountainous setting; these dysregulations took the form of reduced cycle duration and complexity, while skin temperature dynamics became less responsive to perturbations and less regular in magnitude. More research is needed to better understand heat stress temporal dynamics and their influence on human health. Trial registration: This trial is registered with ClinicalTrials.gov; number: NCT03625817.
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Michael Sirivianos
  • Department of Electrical Engineering, Computer Engineering and Informatics
Michael Orford
  • Department of Agricultural Sciences, Biotechnology and Food Science
Lysandros Pantelidis
  • Department of Civil Engineering and Geomatics
Vasileios Fotopoulos
  • Department of Agricultural Sciences, Biotechnology and Food Science
Information
Address
30 Archbishop Kyprianos Str., 3036, Limassol, Cyprus
Head of institution
Panayiotis Zaphiris
Website
http://www.cut.ac.cy/
Phone
+357 25 00 2500
Fax
+357 25 00 2750