No abstract

Designing an ultra-sensitive and stable sensor platform for realtime sensing of dopamine (DA), ascorbic acid (AA) and uric acid (UA) is highly desirable. A simple, green and facile method of synthesis of Ag nanoparticle (AgNP) decorated MoS 2 /rGO nanocomposite for simultaneous electrochemical detection of DA, AA and UA is reported. The unique structural morphology imparts higher electrical conductivity and electrochemical sensitivity to the prepared nanocomposite. The modified electrode material exhibits superior electrocatalytic perform-ance for the detection of DA within a wide linear range of 2.5 to 12.5 μм in presence of interfering electro-active species AA and UA, with limit of detection (LOD) of 0.009 μм. The sensor exhibits excellent stability with up to 500 repetitive cycles of Cyclic Voltammetry. Chronoamperometry and Electrochemical Impedance reveal sufficient electrochemical stability to find potential diagnostic applications. This nanostructure can emerge as a promising electrode for the detection of DA and UA in human urine samples.

AimA huge amount of information associated with the novel coronavirus disease 2019 (COVID-19) outbreak was circulated by mass media in Bangladesh. To date, there is no example on how the lifestyle of the community people in Bangladesh may influence mass media intervention during a pandemic. We aimed to assess mass media influence on changing the lifestyle behavior of people during the early phase of the COVID-19 pandemic. Subject and methodsAn online cross-sectional survey with a limited face-to-face interview among 2080 Bangladeshi respondents was conducted between March 26 and April 1, 2020. Datasets were analyzed through a set of statistical methods such as classical test theory assessment, principal component analysis, Pearson’s correlation coefficient, and stepwise multiple regression model. ResultsThe results showed that there was a positive significant relationship between the composite lifestyle score and the social media is trustworthy during the COVID-19 pandemic (r=0.508, p < 0.01), while there was a negative relationship between the composite lifestyle score of the respondents and the daily online media platforms usage in COVID-19 period (r=−0.201, p < 0.01). The results also disclosed that knowledge level, media credibility, and media check-in had the largest contribution to influence the changing lifestyle of the community people. We also found that social media was highly used media as expected during the COVID-19 outbreak while the administrative action has little influence on the changing lifestyle behavior.ConclusionOur outcomes stress the significance of the reliability of information shared via mass media outlets and practical strategies to counter misinformation during the COVID-19 outbreak.

A formula for the asymptotic solution of an over-damped strongly nonlinear vibration system combining the extended KBM method and the harmonic balance (HB) method with slowly varying coefficients is proposed. This article aims to establish a slowly time-varying solution of an over-damped nonlinear vibration system where one eigenvalue is an integer multiple (greater than two hundred times) of the other eigenvalues. The integrated multiple eigenvalues can provide a better result than other eigenvalues for strong linearity (even if). We found solutions by considering initial conditions and comparing the percentage error of present solutions with unified solutions by using this procedure in examples. Finally, the findings are addressed, especially to improve the physical prospects and shown graphically by using Excel, Dev C++, MATHEMATICA, and MATLAB software.

Many studies were conducted on the topic over the whole world but there is none in Chittagong, Bangladesh. To