Mehedi Hasan

The hydrophobic properties of polytetrafluoroethylene (PTFE), a synthetic fluoropolymer, are widely recognized. Numerous applications exist in the field of hydrophobic, self‐cleaning coatings. Researchers used different types of PTFE and heaters to dry the surface at varying temperatures. According to this viewpoint, the study's goal is to investigate how drying temperature and grain size affect the hydrophobicity of surfaces coated with epoxy, fluorosilicone, and PTFE. The coated surfaces that dried at temperatures of 50, 70, 100, 120, and 150 °C, and atmospheric temperature were developed using different grain sizes of PTFE at different concentrations. The hydrophobicity‐indicating parameters, like contact angles, real‐time contact angles, adhesion work, and adhesion tension, were measured. The results of the study showed that the hydrophobicity of the surface is influenced by the kind of liquid, drying temperature, PTFE content, and grain size. Better results were obtained with a PTFE coating containing 200 nm nanoparticles than with one containing 0.5–1.5 µm microparticles. The samples that were dried between 100 and 120 °C exhibited the highest levels of hydrophobicity, based on the hydrophobicity indicators. Researchers and entrepreneurs are able to develop surfaces that are hydrophobic to clean themselves by employing the research data.

Flow assurance in the petroleum business of the oil and gas industry ensures the efficient and continuous flow of hydrocarbons from production facilities to consumers. Impurities in oil and gas can cause corrosion and erosion, hydrate formation, scaling, and fouling, resulting in flow limits and reduced operating efficiency. The significant flow assurance issues must be managed through systematic exploration of effective mitigation and management approaches. The objective of this paper is to highlight the latest research in the field of flow assurance, including the application of superhydrophobic or omniphobic coatings to prevent scale growth, asphaltene precipitation, wax deposition, and hydrate formation. This review will provide new perspectives into the basic mechanistic mechanisms of deposition and blockage in oil and gas production systems, assisting in the development of novel methods compared to the employment of commercial chemical or mechanical techniques. Overall, the flow assurance engineers will gain new perspectives from this study regarding how to deal with the risk of pipeline blockage caused by the problems mentioned earlier.

Energy is the main driving force for a country's development. Every year, Bangladesh imports a huge amount of coal along with local coal to support the country's energy demand, which stock in open areas. The objective of this research is to evaluate the hydrochemical characteristics of surface, river, and groundwater in a well‐known industrial region in Bangladesh where nearby water is polluted by coal from an open coal stock pile. The findings of this research article concerning the environmental effects of open coal stockpiles will be helpful to policymakers, environmentalists, investors, and other stakeholders. Following WHO standards, GIS extrapolation was used to create maps of key ions in solution (Ca ²⁺ , Mg ²⁺ , Na ⁺ , K ⁺ ) and negatively charged ions (HCO ₃ ⁻ , SO ₄ ²⁻ , Cl ⁻ ). The aquifer's hydrogeochemical process was explained using PCA techniques and the hydrogeochemical facies and water types shown by the Piper and Gibbs diagram. The findings show that the groundwater in this research region is mostly salinized (NaCl‐rich). The result confirms that 67% of the location is of good quality and 33% is of permissible water quality for the surface water sample, whereas 48% of the location is of good quality and 52% is of severe water quality for the ground water sample. Advanced technology should be used to stock the coal to reduce the open stockpile's impact on the environment.

In 21st century, most of the energy comes from the traditional power plant which is run by fuel such as oil, coal, natural gas, etc. Rapidly world's energy consumption rate is getting higher. Alternatively, our world is getting damaged by the huge amount of carbon emission, and resulting disastrous green-house effect. Keeping the hazards in the mind, scientists are focusing more into the renewable energy sources. Then again renewable energy sources have few disadvantages such as unpredictability and unavailability. To overcome these problems hybrid renewable energy are becoming more popular nowadays. The fundamental focal point of this paper is to review the modeling of a PV wind hybrid system along with grid connection. We have also discussed about different hybrid systems of renewable sources and conditions for optimization. This paper will give an idea about different software which are used for system optimization. To make the hybrid system economically viable and environment friendly, solar and wind hybrid energy have been established. This paper presents an evaluation on modeling, optimization, constraints and possibilities of hybrid solar PV system.