Oskar Hasdinor Hassan

Density functional theory (DFT) uniquely predicts diverse materials phenomena by seamlessly connecting electron interactions at the atomic scale to tangible structure and property evolution for revolutionary materials design. Through DFT, materials behavior can be predicted without expansive experimentation. This work imparts a fundamental evaluation on the electronic and optical behavior of optimized zinc cobaltite (ZnCo2O4), computed via Density Functional Theory (DFT), within the Cambridge Serial Total Energy Package (CASTEP) framework. By employing two generalized gradient approximation (GGA-PBE and GGA-PBESOL) and a local density approximation (LDA-CAPZ) at the optimized cut-off energy of 630 eV and 4 4 4 k-points, the electronic and optical properties analysis was successfully deduced. The direct band gap and conductive behavior of ZnCo2O4 have been evaluated by means of band structure and Density of States (DOS) calculation. The dielectric constant, refractive index, and absorption spectrum also reveals the viability of ZnCo2O4 in electronic device application.

A significant amount of solid waste is dumped by the ceramics sector, which is a worry for the environment. As well known, Kuala Kangsar, Perak, Malaysia is the location to a large ceramics industry. In Malaysia, there are landfills, but not all of them can manage solid waste perfectly. As a result, many waste disposal contractors look down on solid waste management such as for Plaster of Paris (POP). This is even more complicated when there are a handful of them who take the easy way out by disposing of POP waste by planting or dumping it into rivers and seas. This causes various problems to the environment and health. The aim of this study is to identify how to recycle waste mould into new plaster without affecting their casting performance. This paper shows the study of the effect of characteristics Recycle Plaster of Paris (RPOP) compared to New Plaster of Paris (NPOP). Drying temperatures are performed at (150℃,160℃,170℃,180℃ and 190℃) for RPOP and use the same 60% of material and 40% of water ratio and tests for porosity, absorption, setting times and particle size are performed. The results indicate that all samples of Recycled Plaster of Paris performed well and can function similarly to New Plaster of Paris at different temperatures.

In today's digital media era, the protection and inheritance of intangible cultural heritage are very important to enhance the cultural literacy and cultural confidence of citizens. This paper is based on the "Qin Brick and Han Tile Museum" in Xi'an, Shaanxi Province, China, which has the most complete variety of tiles, well-preserved and exquisite patterns to digitally transform this intangible cultural heritage into cultural and creative products that represent the concept of intangible cultural heritage design.Analyzed the current situation and digital design concepts according to 1,300 questionnaire data,and puts forward the strategy to enhance the protection, display, and sale of the intangible cultural heritage protection to meet the viewing of more groups and promote the concept of intangible cultural heritage protection.

This paper discusses how a 3D drafting system is developed to accommodate complex human-machine interface characteristics. An object-oriented multi-level structured test case design method is proposed. An Oracle-based distributed project management database is constructed. A new 3D CAD surface model search method is given. A 3D CAD surface model retrieval algorithm based on distance-curvature shape distribution is proposed. The method can effectively solve the collaboration problem of multiple parallel programs. The designed software platform is proved to be complete, scalable and open through practical applications. Finally, it can effectively achieve human-to-human collaboration and resource sharing.

HRMARS is well established journal publisher based in Pakistan. It is publishing prominent journals in social sciences since 2011.

This study reports on the structure analyses of NiO-BCZY (BCZY = BaCe_0.54Zr_0.36Y_0.1O_3-δ) anode composite materials with the ratio of 50:50 for proton ceramic fuel cells (PCFCs) application. A product of sintered NiO-BCZY was developed to understand the structural properties of the anode materials. The objectives of this work were (a) to investigate the lattice expansion of the anode by using a high-temperature XRD (HT-XRD) from 400–700 °C; and (b) to calculate the crystallite size of the sample by using Scherrer’s and Williamson Hall’s methods. The results obtained from the HT-XRD revealed that the diffraction peaks of NiO and BCZY are matched with the cubic phase perovskite structure. For example at T = 400 °C, the lattice parameter of NiO is a = 4.2004 Å and BCZY is a = 4.3331 Å. The observation also showed that the lattice expansion increased with the temperature. Furthermore, analyses of the Scherrer and Williamson Hall methods, respectively, showed that the crystallite size is strongly correlated with the lattice expansion, which proved that the crystallite size increased as the operating temperature increased. The increment of crystallite size over the operating temperature contributed to the increment of conductivity values of the single cell.

Good thermoelectric performance is being sought to face major problems related to energy, especially in the concern of the usage of energy on environmental impact. In this work, we investigate the underlying mechanism to enhance the thermoelectric performance of bismuth selenide (Bi₂Se₃) by employing density functional theory (DFT) followed by the Boltzmann transport equation under relaxation time approximation. The structural, electronic, and thermoelectric properties were calculated and analyzed. From the analysis of combined results of thermoelectric properties and electronic properties as the function of the Fermi level, we found that the power factor of Bi₂Se₃ is improved by increasing electrical conductivity that contributed by the large density of states and light effective mass of charge carriers. The figure of merit, on the other hand, is enhanced by increasing Seebeck coefficient that contributed by heavy effective mass and decreasing thermal conductivity that contributed by low density of states. We also found that both power factor and figure of merit can be improved through n-type doping at 300 K and p-type doping at higher temperature (400 K and 500 K).