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The aim of this research is to analyze the impact of parent satisfaction on Children's online learning for Primary Education during the COVID-19 Pandemic. Independent variables are Child competency, Technical Problems, Duration of online learning, and several assignments. The research method is a quantitative approach with Primary data analysis using Google form. The population in this study was the parents of the Primary school students who are following the Bachelor of Education (Hons) in Primary Education at the Open University of Sri Lanka using a simple random sampling method. Respondents of 102 data analyses were done through descriptive statistics, Pearson Correlation, and Regression and were analyzed using SPSS. By using a structured questionnaire with five Likert scales from strongly disagree to strongly agree measured independent and dependent variables. The results of this study are independent variables had a significant impact on parents' satisfaction with online learning. But Technical Problem was not significant in parents' satisfaction with online learning. The moderation effect explains the association between the following three factors; the number of online assignments, the duration of online learning, and parents' satisfaction. According to the Child competency, Parents were more satisfied with their children's online learning. Researchers may use this article as literature or supplementary material for future research.

Nanotechnology can help increase agriculture production sustainably by making better use of agricultural products and decreasing by-products harmful to the ecosystem or human health. The use of nanotechnology raises expectations for increasing farming output by tackling issues that cannot be handled in a traditional way. Through processes such as targeted delivery, slow/controlled release, and conditional release, nanostructured formulations could more exactly release their active components in reaction to environmental cues and biological demands. According to studies, the use of nano fertilizers increases nutrient use efficiency, reduces soil toxicity, minimizes the possible negative impacts of overdosing, and lowers the frequency of application. This review provides a comprehensive overview of significant applications in agriculture and food production including nanotechnology in seed science, weed control, nutrition, pesticides, and disease control among others. Additionally, future applications and possible risks are also discussed. [ABSTRACT FROM AUTHOR]

In the present work, we have prepared Fe3O4/TiO2 thin film on the FTO plate by the hydrothermal method in a two-step process, primarily coated TiO2 and followed Fe3O4 on TiO2. The prepared thin film was characterized for structural, functional, optical, and morphological properties employing powder-XRD, FT-IR, UV–Visible, and FE-SEM respectively. XRD and FE-SEM analysis confirmed the distribution of Fe3O4 on TiO2. FTIR affirmed the firm interfacial contact of Fe3O4 on TiO2 resulting optical band gap to be 2.2 eV. MB dye degradation studies under direct sunlight radiation showed 78% and 84% in 4 h for TiO2 and Fe3O4/TiO2 respectively. The reusability of the catalyst showed 82% after three cycles of studies, which affirms the stability of the thin film. Hence, Fe3O4/TiO2 thin film coated on the FTO plate could be a promising catalyst for the degradation of MB dye in real time application. [ABSTRACT FROM AUTHOR]

A positive change in crystal can be induced by dye. Pure and Acid Red 1 dye (AR) doped triglycine acetate (TGAc) single crystals are synthesized by solution approach to enrich the characteristics of pure TGAc crystals. The crystalline nature of the grown crystals is investigated using powder X-ray diffraction. The Scherrer method has been used to calculate the crystallite size of both developed crystals and is compared to the Williamson and Hall method. Fourier transform infrared spectroscopy confirms the existence of several functional groups as well as dye inclusion in the produced crystals. Four distinct absorption bands are found in UV-vis-NIR absorption spectra at the location where AR dye is inserted into the TGAc matrix. Different optical constants, such as optical bandgap (Eg), extinction coefficient (k), refractive index (n) and optical conductivity (σ) are measured for both samples based on transmittance measurements. The thermal stability and decomposition temperature of 0.05 mol% AR dye doped TGAc are found to be higher. The doped crystals' improved optical characteristics and thermal stability prove their applicability for optoelectronic applications. [ABSTRACT FROM AUTHOR]

We report the effect of gamma irradiation on structural and magnetic properties of Mn0.42+Zn0.62+Smx3+Gdy3+Fe2-(x+y)3+O4 (where x = y = 0.01, 0.02, 0.03, 0.04 and 0.05) ceramics prepared by self-propagating high-temperature synthesis method using glucose and urea as fuels. The synthesized samples are characterized through X-ray diffractometer (XRD) and vibration sample magnetometer at room temperature before and after gamma irradiation. The XRD patterns of before irradiation samples reveal the formation of polycrystalline, mixed spinel cubic structure. The mixed (impurity) phases are identified as Fe2O3, SmFeO3 and GdFeO3, and the amount of these residual phases is comparatively less after gamma irradiation. Lattice parameter is found to be increasing with increasing Sm3+ and Gd3+ concentration is observed after gamma irradiation. This is due to the irradiation of ionizing gamma radiation with the material which gives rise to the production of lattice defect and then the displacing of atoms from their equilibrium position. The magnetic properties reveal that saturation magnetization (Ms), remnant (Mr), remnant ration (Mr/Ms), coercivity (Hc), magneton number (ηB), anisotropy constant (K) have been decreasing with increasing Sm3+ and Gd3+ concentration before and after gamma irradiation. This is due to breaking of ferrimagnetic ordering, surface state pinning and cation inversion of the materials. Hence, our results propose the good radiation stability of the samples when compared to reported material stability in the literature. [ABSTRACT FROM AUTHOR]

Nano structured Hausmannite (Mn 3 O 4 ) has efficacious applications in numerous fields, such as catalytic, medical, biosensors, waste water remediation, energy storage devices etc. The potential application in wastewater treatment is due to its distinct structural features combined with fascinating physicochemical properties. Another area of interest is the oxidative properties imparted due to its reduction potential. Larger surface to volume ratio and high reactivity than the bulk form shows great progress as antimicrobial agent to control drug resistant microbial population. The distinct surface morphologies, crystalline forms, reaction conditions and synthetic methods exerts significant impact on the photo catalytic and bactericidal efficiency. Hence, the present paper focuses on a concise review of the multifarious study on synthetic methods of Mn 3 O 4 , growth mechanisms, structural forms, phase transformation and phase control, shape and dimensionality. The review also confers its applications towards photo catalytic and bactericidal studies., (© 2020 Published by Elsevier Ltd.)