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Objective: Since the Coronavirus disease in 2019 (COVID-19) was announced as a worldwide pandemic, it has affected all aspects of life, including the economy, society, and the healthcare system. The impact of COVID-19 on co-morbidities is a concern however, there are few studies on dermatological patients. To determine COVID-19's impact on the number of hospital admissions and the changes of common diseases at the National Hospital of Dermatology and Venereology. Methods: A cohort study is conducted to collect all admission over four years from Feb 2018 to Jun 2021. The dataset including 10506 records was extracted from the hospital information system database. Descriptive statistical was used to analyse the admission differences between the four- year periods. Results: The number of patients markedly decreased by about 30% in 2020 and about 60% in 2021. The male/female ratio did not change significantly between before and after the pandemic. Benign neoplasia was the greatest change from 5.9% (2018) to 21% (2021). The allergic/reactive group decreased from 40% (2018) to 25% (2021). The infectious group also decreased from 20% (2018) to 10.8% (2021). The autoimmune group fluctuated at 9%-10%. The top 10 common diseases show that the first position was psoriasis then switched to Carcinoma in situ of skin during the Covid-19 time. Conclusion: The results of this study are significant in predicting the trend of dermatology patients' admission during a pandemic. The results assist health system leaders and public health authorities in adjusting policies and procedures to suit the pandemic situation that is still complicated. Keywords: COVID-19, SARS-CoV-2, hospital admission, hospitalizations, dermatology service

Objectives To examine i) the use of mobile apps and fitness trackers in adults during the COVID-19 pandemic to support health behaviors; ii) the use of COVID-19 apps; iii) associations between using mobile apps and fitness trackers, and health behaviors; iv) differences in usage amongst population subgroups. Methods An online cross-sectional survey was conducted during June–September 2020. The survey was developed and reviewed independently by co-authors to establish face validity. Associations between using mobile apps and fitness trackers and health behaviors were examined using multivariate logistic regression models. Subgroup analyses were conducted using Chi-square and Fisher’s exact tests. Three open-ended questions were included to elicit participants’ views; thematic analysis was conducted. Results Participants included 552 adults (76.7% women; mean age: 38±13.6 years); 59.9% used mobile apps for health, 38.2% used fitness trackers, and 46.3% used COVID-19 apps. Users of mobile apps or fitness trackers had almost two times the odds of meeting aerobic physical activity guidelines compared to non-users (odds ratio = 1.91, 95% confidence interval 1.07 to 3.46, P = .03). More women used health apps than men (64.0% vs 46.8%, P = .004). Compared to people aged 18–44 (46.1%), more people aged 60+ (74.5%) and more people aged 45–60 (57.6%) used a COVID-19 related app (P < .001). Qualitative data suggest people viewed technologies (especially social media) as a ‘double-edged sword’: helping with maintaining a sense of normalcy and staying active and socially connected, but also having a negative emotional effect stemming from seeing COVID-related news. People also found that mobile apps did not adapt quickly enough to the circumstances caused by COVID-19. Conclusions Use of mobile apps and fitness trackers during the pandemic was associated with higher levels of physical activity, in a sample of educated and likely health-conscious individuals. Future research is needed to understand whether the association between using mobile devices and physical activity is maintained in the long-term.

The Mong Cai area, coastal sediments were collected and analyzed for grain sizes, heavy metals, total organic carbon, and isotopes (210Pb, 226Ra, δ15N, δ13C) for assessing sediment quality.Which sediments common were fine sand in surface sediment, very fine sand in core C1, very coarse silt and coarse silt in core C2. The total organic carbon was highest in C2 next to the surface and lowest in C1, with content levels of 1.81%, 0.40%, and 0.31%, respectively. δ13C and δ15N in the sediment reflected the source of the organic matter mix from the marine and terrigenous sediments. Heavy metals were lower than ISQGs, exception of As in C1 and C2 were higher, in C1 showed a decline over time, while in C2 increased between 1996 and 2019. The Mong Cai area was common by sand, accumulation of heavy metals was small, impact of heavy metal pollution on ecosystems was low.

A series of microporous Zn doped Fe3O4 spheres were successfully fabricated by a simple method. The characteristic of the obtained products was studied using the X-ray diffraction (XRD), Ra...

In this work, we reported synthesis of a novel magnetically separable g-C3N4/Zn doped Fe3O4 composite (g-CN/ZnFe) by a simple polyol thermal method. The characteristics of the as-prepared composite was checked by XRD, SEM, TEM, XPS, PL technologies. The optimized weight ratio of g-C3N4 and Zn doped Fe3O4 was investigated. In addition, the photocatalytic activities of the composite products were checked by degradation of Cephalexin (CEX) under visible light. The results showed that g-CN/ZnFe composite with an added 20% g-C3N4 exhibited the highest photocatalytic activity for cephalexin under visible light irradiation. The improved photocatalytic activity of 20% g-CN/ZnFe can be ascribed to the low combination rate of photoinduced electron/hole pairs. Especially, g-CN/ZnFe can be recovered easily by using an external magnetic field and has the high stability after six runs. These properties of the g-CN/ZnFe as-prepared composite could be a promising photocatalyst for the degradation of pharmaceutical contaminants.

In this work, we reported synthesis

Photocatalysis is an effective treatment technique for the removal of toxic pollutants present in water and wastewater. In this study, graphene@Fe-Ti binary oxide composites was prepared using a hydrothermal method and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and Brunauer-Emmett-Teller surface area analysis. The prepared composite exhibited even distribution of the Fe-Ti binary oxide on the surface of graphene, with an average diameter of 16.4 nm and a surface area of 133.7 m2/g. The optical property was evaluated and the band gap was calculated to be 2.867 eV using solid-state UV–vis spectroscopy and the [F(R)hν]1/2 plot. Lab-scale experiments were performed to evaluate the performance of graphene@Fe-Ti binary oxides to remove methyl blue (i.e. a dye) from wastewater. It was observed that the graphene loading had a significant effect on the photocatalytic activity of the composite and a composite with 20 % graphene showed the highest photocatalytic activity, with 100 % removal of the dye, after 20 min of irradiation time and a degradation rate constant of 0.213 min−1. Besides, the possible photocatalytic dye degradation mechanism using graphene@Fe-Ti binary oxide composite has also been proposed.