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  • 1
    In: Frontiers in Nutrition, Frontiers Media SA, Vol. 7 ( 2020-11-16)
    Type of Medium: Online Resource
    ISSN: 2296-861X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2776676-7
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  • 2
    In: International Journal of Public Health, Frontiers Media SA, Vol. 66 ( 2021-6-23)
    Abstract: Objectives: We explored the association of underlying health conditions (UHC) with depression and anxiety, and examined the modification effects of suspected COVID-19 symptoms (S-COVID-19-S), health-related behaviors (HB), and preventive behaviors (PB). Methods: A cross-sectional study was conducted on 8,291 outpatients aged 18–85 years, in 18 hospitals and health centers across Vietnam from 14th February to May 31, 2020. We collected the data regarding participant's characteristics, UHC, HB, PB, depression, and anxiety. Results: People with UHC had higher odds of depression (OR = 2.11; p & lt; 0.001) and anxiety (OR = 2.86; p & lt; 0.001) than those without UHC. The odds of depression and anxiety were significantly higher for those with UHC and S-COVID-19-S ( p & lt; 0.001); and were significantly lower for those had UHC and interacted with “unchanged/more” physical activity ( p & lt; 0.001), or “unchanged/more” drinking ( p & lt; 0.001 for only anxiety), or “unchanged/healthier” eating ( p & lt; 0.001), and high PB score ( p & lt; 0.001), as compared to those without UHC and without S-COVID-19-S, “never/stopped/less” physical activity, drinking, “less healthy” eating, and low PB score, respectively. Conclusion: S-COVID-19-S worsen psychological health in patients with UHC. Physical activity, drinking, healthier eating, and high PB score were protective factors.
    Type of Medium: Online Resource
    ISSN: 1661-8564
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2276416-1
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  • 3
    In: Frontiers in Nutrition, Frontiers Media SA, Vol. 8 ( 2021-11-12)
    Abstract: Background: The COVID-19-induced lockdown has been implemented in many countries, which may cause unfavorable changes in lifestyles and psychological health. People's health literacy, healthy diet, and lifestyles play important roles in mitigating the negative impacts of the pandemic. Therefore, we aimed to examine associations of COVID-19 lockdown with changes in eating behavior, physical activity, and mental health; and the modification effects by digital healthy diet literacy (DDL) and eHealth literacy (eHEALS) on the associations. Methods: We conducted an observational study on 4,348 outpatients from 7th April to 31st May 2020. Data from 11 hospitals in Vietnam included demographic characteristics, DDL, eHEALS, eating behavior, physical activity, and mental health changes. Multiple logistic regression and interaction models were performed to examine associations. Results: Patients under lockdown had a lower likelihood of having “unchanged or healthier” eating behavior (odds ratio, OR, 0.38; 95% confidence interval, 95%CI, 0.29 to 0.51; p & lt; 0.001), “unchanged or more” physical activity (OR, 0.79; 95% CI, 0.69 to 0.90; p & lt; 0.001), and “stable or better” mental health (OR, 0.77; 95% CI, 0.67 to 0.89; p & lt; 0.001), as compared to those after lockdown. In interaction models, as compared to patients after lockdown and with the lowest DDL score, those under lockdown and with a one-score increment of DDL had a higher likelihood of having “unchanged or healthier” eating behavior (OR, 1.05; 95% CI, 1.02 to 1.07; p & lt; 0.001), and “stable or better” mental health (OR, 1.02; 95% CI, 1.01 to 1.04; p & lt; 0.001). Similarly, as compared to patients after lockdown and with the lowest eHEALS score, those under lockdown and with a one-score increment of eHEALS had a higher likelihood of having an “unchanged or more” physical activity (OR, 1.03; 95% CI, 1.01 to 1.05; p & lt; 0.001). Conclusion: The COVID-19 lockdown measure could negatively affect eating behavior, physical activity, and mental health among outpatients. Better DDL and eHEALS were found to mitigate the negative impacts of the lockdown, which may empower outpatients to maintain healthy lifestyles and protect mental health. However, this study holds several limitations that may undermine the certainty of reported findings.
    Type of Medium: Online Resource
    ISSN: 2296-861X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2776676-7
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  • 4
    Online Resource
    Online Resource
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  Communications in Physics Vol. 30, No. 4 ( 2020-11-14), p. 383-
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 30, No. 4 ( 2020-11-14), p. 383-
    Abstract: Graphene/polymer composite thin film electrodes have many important applications, but the fabrication of these electrodes is often difficult because of poor processability of graphene. This paper presents the primary results on using 3D printing technique for thin film electrode preparation from graphene-based composite ink. The printing ink was synthesized from graphene oxide (GO), polyvinyl alcohol (PVA) as a binder and stabilizer, and ascorbic acid (AA) as a reducing agent. The measured zeta potential value showed that PVA can make GO ink more stable, the absolute value of zeta potential increased from 10.1 mV (without PVA) to 31.4 mV (with 12 wt. % PVA). The thin film electrodes can be easily printed using GO/PVA/AA composite ink, and obtained voltammograms recorded on the surface of these electrodes in 5 mM K3[Fe(CN)6]/K4[Fe(CN)6] solution clearly indicated the GO reduction by AA. The best electrochemical properties of printed electrodes were founded in the case of composite ink with wt/wt ratio GO:PVA:AA = 80:12:8. The cyclic voltammetric results demonstrated the linear dependence of the anodic and cathodic signals of redox couple [Fe(CN)6]4-/K3[Fe(CN)6] 3- with the   square root of scan rate, indicating a reversible redox reaction on the electrode surface. The thin films printed from GO/PVA/AA composite ink can be used as electrode material for diverse applications in electrochemistry.
    Type of Medium: Online Resource
    ISSN: 2815-5947 , 0868-3166
    URL: Issue
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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  • 5
    Online Resource
    Online Resource
    GSC Online Press ; 2022
    In:  GSC Advanced Research and Reviews Vol. 12, No. 3 ( 2022-09-30), p. 164-173
    In: GSC Advanced Research and Reviews, GSC Online Press, Vol. 12, No. 3 ( 2022-09-30), p. 164-173
    Abstract: Background: The COVID-19 pandemic has serious consequences around the world, especially in the healthcare system. With a crucial role in the pandemic, mental health and quality of life among health care workers (HCWs) needs to be addressed. Purposes: The study aimed to describe mental health and the health-related quality of life among HCWs and explore the relationship between mental health and quality of life among HCWs during the COVID-19 pandemic. Methods: A cross-sectional study was conducted from 6 April to 19 April 2020 at nine hospitals in Vietnam. The questionnaire included participant's characteristics, health-related quality of life (HRQoL), Patient Health Questionnaire (PHQ), and Generalized Anxiety Disorder (GAD). De-pression and anxiety were defined as PHQ score ≥ 10 and GAD score ≥ 8, respectively. Descriptive, bivariate, and multiple regression analyses were used to analyze the data with a significant level at p 〈 0.05. Results: A total of 3,757 HCWs were enrolled in the study. Proportions of de-pression and anxiety were 4.5% and 3.1%, respectively. The overall mean score of HRQoL was 73.4 ± 14.9 (possible score range from 0 to 100). Protective factors of HRQoL consisted of physical activity, ability to pay for medication, gender, and social status, while its risk factors included suspected COVID-19 symptoms, smoking status. HRQoL was associated with depression (B(95%CI) = -8.15 (-10.76 to -5.55) and anxiety (B(95%CI) = -6.87 (-9.99 to -3.75)), p 〈 0.001. Conclusion: There was a relationship between mental health and the health-related quality of life among HCWs. Integration of healthy lifestyles and psychological support can help improve mental health and quality of life for HCWs during the pandemic.
    Type of Medium: Online Resource
    ISSN: 2582-4597
    URL: Issue
    Language: Unknown
    Publisher: GSC Online Press
    Publication Date: 2022
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  • 6
    Online Resource
    Online Resource
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Communications in Physics Vol. 31, No. 4 ( 2021-09-29), p. 399-
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 31, No. 4 ( 2021-09-29), p. 399-
    Abstract: We study the FCNC problems in  3-4-1-1  model in a way different from the previous work. The sources of FCNC at the tree-level in the  3-4-1-1 model come from both the gauge and scalar sectors. We show that the most stringently bound on the tree-level FCNC interactions comes from the meson oscillations. The lower bound on the new physics scale is imposed more tightly than in the previous work, \(M_{new} 〉 22\) TeV. On the allowed value domain of the new physical scale, we show that the contribution of the tree-level FCNC interactions to the BrB\(_s \rightarrow \mu^+ \mu^-)\) is negligible.
    Type of Medium: Online Resource
    ISSN: 0868-3166 , 0868-3166
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 7
    Online Resource
    Online Resource
    IOP Publishing ; 2023
    In:  Journal of Physics: Conference Series Vol. 2485, No. 1 ( 2023-04-01), p. 012003-
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2485, No. 1 ( 2023-04-01), p. 012003-
    Abstract: We propose a theoretical model to investigate photothermal heating of ultra-flexible metamaterials, which are obtained by randomly mixing TiN nanoparticles in polydimethylsiloxane (PDMS). Due to the plasmonic properties of TiN nanoparticles, incident light can be perfectly absorbed in a broadband range (300-3000 nm) to generate heat within these metamaterials. Under irradiation of an 808 nm near-infrared laser with different intensities, our predicted temperature rises as a function of time agree well with recent experimental data. For a given laser intensity, the temperature rise varies non-monotonically with the concentration of TiN nanoparticles. Increasing the TiN concentration leads to a decrease in the heating process since the thermal conductivity grows. A small TiN concentration significantly reduces the absorbed energy and, thus, the system is less heated. When we apply this model to solar heating, we find that the temperature rise is no longer non-monotonic, and the heating efficiency is much lower than in the laser case. Our studies would provide good guidance for future experimental studies on the photothermal heating of broadband perfect absorbers.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2166409-2
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  • 8
    Online Resource
    Online Resource
    International Journal of Innovative Research & Development (GlobeEdu) ; 2021
    In:  International Journal of Innovative Research and Development Vol. 10, No. 6 ( 2021-06-30)
    In: International Journal of Innovative Research and Development, International Journal of Innovative Research & Development (GlobeEdu), Vol. 10, No. 6 ( 2021-06-30)
    Type of Medium: Online Resource
    ISSN: 2278-0211
    Language: Unknown
    Publisher: International Journal of Innovative Research & Development (GlobeEdu)
    Publication Date: 2021
    detail.hit.zdb_id: 2660938-1
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  • 9
    Online Resource
    Online Resource
    International Journal of Innovative Research & Development (GlobeEdu) ; 2020
    In:  International Journal of Innovative Research and Development Vol. 9, No. 11 ( 2020-11-30)
    In: International Journal of Innovative Research and Development, International Journal of Innovative Research & Development (GlobeEdu), Vol. 9, No. 11 ( 2020-11-30)
    Type of Medium: Online Resource
    ISSN: 2278-0211
    Language: Unknown
    Publisher: International Journal of Innovative Research & Development (GlobeEdu)
    Publication Date: 2020
    detail.hit.zdb_id: 2660938-1
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  • 10
    Online Resource
    Online Resource
    IOP Publishing ; 2023
    In:  Journal of Physics D: Applied Physics Vol. 56, No. 46 ( 2023-11-16), p. 465502-
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 56, No. 46 ( 2023-11-16), p. 465502-
    Abstract: This article presents a novel approach to improve both the photoelectrocatalytic activity and stability of the p-Cu 2 O photocathode. The approach involves the coating of an n-type TiO 2 layer using e-beam evaporation with precise controllability of the coating thickness onto the p-type Cu 2 O electrode, forming a TiO 2 /Cu 2 O p/n heterojunction. Such a p/n junction enhances the photoelectrocatalytic activity of the Cu 2 O electrode by promoting the separation of the photo-generated charge carriers. Additionally, the large bandgap TiO 2 coating layer serves as protection, reducing the photocorrosion of Cu 2 O, thereby improving the stability of the electrode. The n-TiO 2 /p-Cu 2 O photocathode shows superior photoelectrochemical H 2 evolution activity in comparison to the pristine p-Cu 2 O photocathode. We have found that the thickness and annealing temperature of TiO 2 influence strongly the photocurrent and stability of the resultant TiO 2 /Cu 2 O photocathode. The best TiO 2 /Cu 2 O photocathode was achieved by coating a 50 nm thick TiO 2 layer onto the Cu 2 O, followed by annealing at 350 °C. This configuration exhibited a large onset photovoltage of 0.58 V vs RHE and a catalytic current density of ∼0.9 mA·cm ‒2 at 0 V vs RHE in a pH 7 phosphate buffer, under standard 1 Sunlight illumination.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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