Effect Of Deposition Temperature And Type Of Substrates On Structural, Surface Morphology And Optical Properties Of Rf Magnetron Sputtered Ccto Thin Film

Calcium copper titanate (CCTO) thin film with high dielectric permittivity (ε), low tangent loss (tan δ) and have high temperature phase stability up to 300 °C is very importance for several advanced microelectronic applications. The electrical and optical properties are depended on the structural and surface morphology of CCTO thin film. This project aims to study effect of deposition temperature and type of substrates (ITO, FTO and glass) on the structural, surface morphology and optical properties of sputtered CCTO thin film. Firstly, CCTO thin films were deposited on different type of substrates (ITO, FTO and glass) at deposition temperatures of 100, 150, 200 and 250 °C by RF magnetron sputtering in Argon atmosphere. The structural, surface morphology and optical properties of the deposited CCTO thin film have been studied by X-ray diffraction (XRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX) and ultraviolet-visible (UV-vis) spectrophotometer. XRD analysis showed CCTO thin films on ITO and FTO substrates have a highest intensity peak at (022) while CCTO thin film on glass substrates showed almost amorphous in structure. Besides, crystallinity of CCTO thin film on ITO and FTO increased with increase of deposition temperature. FESEM only able to reveal the crystallite size of CCTO thin film on ITO substrates and the crystallite size is increased with increase of deposition temperature. AFM analysis showed the blank FTO substrates with 6 times rougher than blank ITO and glass substrates caused the CCTO thin film on it have significant higher in surface roughness and pore size. This is due to CCTO thin film are highly dependent on the surface feature of substrate. Increase of deposition temperature have increased the surface roughness (Ra) and pore size respectively. In addition, Tauc plot method was used to estimate the optical energy band gap of the deposited CCTO thin film. Optical energy band gap of the CCTO were decreased from 3.50 eV to 3.14 eV (ITO), 3.52 eV to 3.10 eV (FTO) and 3.58 eV to 3.10 eV (glass) as deposition temperature increased from 100 °C to 250 °C. Therefore, favourable CCTO thin film properties can be possibly obtained for particular application by controlling deposition temperature and using different type of substrates

The influence of OLR1 and PCSK9 gene polymorphisms on ischemic stroke: Evidence from a meta-analysis

It has been reported that both OLR1 and PCSK9 genes are related to various vascular diseases such as atherosclerosis, cardiovascular disease, peripheral artery disease and stroke, in particular ischemic stroke. The prevalence of PCSK9 rs505151 and OLR1 rs11053646 variants in ischemic stroke were 0.005 and 0.116, respectively. However, to date, association between OLR1 rs11053646 and PCSK9 rs505151 polymorphisms and the risk of ischemic stroke remains unclear and inconclusive. Therefore, this first meta-analysis was carried out to clarify the presumed influence of genetic polymorphisms on ischemic stroke, by analyzing the complete coverage of all relevant studies. All eligible case-control and cohort studies that met the search term were retrieved in multiple scientific databases. Data of interest such as demographic data and genotyping methods were extracted from each study, and the meta-analysis was performed using RevMan 5.3 and Metafor R 3.2.1. The pooled odd ratios (ORs) and 95% confidence intervals (CIs) were calculated using both fixed- and random-effect models. A total of seven case-control studies encompassing 1897 ischemic stroke cases and 2119 healthy controls were critically evaluated. Pooled results from the genetic models indicated that OLR1 rs11053646 dominant (OR=1.33. 95%CI:1.11-1.58) and co-dominant models (OR=1.24, 95%CI:1.02-1.51) were significantly associated with ischemic stroke. For PCSK9 rs505151 polymorphism, the OR of co-dominant model (OR=1.36, 95%CI:1.01-1.58) was found to be higher among ischemic stroke patients. In conclusion, the current meta-analysis highlighted that variant allele of OLR1 rs11053646 G>C and PCSK9 rs505151 A>G may contribute to the susceptibility risk of ischemic stroke

The rise of solo dining: prediction and consumer profiling

© 2024 Taylor & Francis. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1080/15378020.2024.2307682The aim of this study is twofold: first, to investigate the factors that affect consumers’ intentions to dine alone, drawing on the theory of planned behavior (TPB); and second, to segment consumers based on their motives for solo dining. The TPB is chosen as the theoretical framework because it is regarded as a comprehensive social-psychological model that can explain an individual’s intentions well. A total of 207 participants from Malaysia completed an online questionnaire using the convenience sampling method. The collected data were subjected to statistical analyses, including partial least squares structural equation modeling (PLS-SEM) and cluster analysis. Our findings show that only attitudes have a significant positive influence on intentions. Furthermore, entertainment and economic factors are found to be significant factors of attitudes. Findings from cluster analysis show four diverse groups: enjoyers, economical diners, socializers, and relaxers. This study represents the first attempt to explore consumers’ solo dining intentions through the lens of the theory of planned behavior. Moreover, by identifying four distinct segments of solo dining consumers, the findings offer valuable insights for restaurant owners seeking to effectively target this growing market. Overall, this study not only examines the factors influencing consumers’ solo dining intentions but also segments the types of solo diners, extending the utility of the TPB.Peer reviewe

The rise of solo dining: prediction and consumer profiling

The aim of this study is twofold: first, to investigate the factors that affect consumers’ intentions to dine alone, drawing on the theory of planned behavior (TPB); and second, to segment consumers based on their motives for solo dining. The TPB is chosen as the theoretical framework because it is regarded as a comprehensive social-psychological model that can explain an individual’s intentions well. A total of 207 participants from Malaysia completed an online questionnaire using the convenience sampling method. The collected data were subjected to statistical analyses, including partial least squares structural equation modeling (PLS-SEM) and cluster analysis. Our findings show that only attitudes have a significant positive influence on intentions. Furthermore, entertainment and economic factors are found to be significant factors of attitudes. Findings from cluster analysis show four diverse groups: enjoyers, economical diners, socializers, and relaxers. This study represents the first attempt to explore consumers’ solo dining intentions through the lens of the theory of planned behavior. Moreover, by identifying four distinct segments of solo dining consumers, the findings offer valuable insights for restaurant owners seeking to effectively target this growing market. Overall, this study not only examines the factors influencing consumers’ solo dining intentions but also segments the types of solo diners, extending the utility of the TPB

Low incidence of venous thrombosis but high incidence of arterial thrombotic complications among critically ill COVID-19 patients in Singapore

10.1186/s12959-021-00268-9THROMBOSIS JOURNAL19

Low incidence of venous thrombosis but high incidence of arterial thrombotic complications among critically ill COVID-19 patients in Singapore

BACKGROUND: Arterial and venous thrombosis are reported to be common in critically ill COVID-19 patients. METHODS AND RESULTS: This is a national multicenter retrospective observational study involving all consecutive adult COVID-19 patients who required intensive care units (ICU) admission between 23 January 2020 and 30 April 2020 in Singapore. One hundred eleven patients were included and the venous and arterial thrombotic rates in ICU were 1.8% (n = 2) and 9.9% (n = 11), respectively. Major bleeding rate was 14.8% (n = 16). CONCLUSIONS: Critically ill COVID-19 patients in Singapore have lower venous thromboembolism but higher arterial thrombosis rates and bleeding manifestations than other reported cohorts