Mixture of CO2-N2 as a potential to SF6 insulation gas: an overview

Each equipment in the high voltage (HV) system must retain an appropriate electrical insulation for protection and to avoid any of leakage current [1]. Thus, the choice of insulation material is essential. There are three types of insulation medium which is gases, liquids, and solids. Previous research claims that at normal temperature and pressure, gas insulation was an excellent insulator. An excellent gaseous dielectric material, however, required a long list of demanding properties, for example, having an utmost dielectric strength, good heat transfer, environmental-friendly, high thermal constancy, and available at low cost

Energy Performance Contracting Initiative in Malaysian Public Hospitals

Ministry of Health Malaysia (MOH) has integrated sustainability program in the management of its assets particularly hospital buildings in line with the national sustainability goals and the United Nation Sustainable Development Goals.  The fundamental sustainability change is significant since 2015 in the public healthcare sector where green business practice is more appreciable through formation of policy and sustainability related programme. Public hospital in Malaysia are very high energy consumers, therefore various energy projects have been implemented through Energy Performance Contracting (EPC). EPC projects in MOH is intended to deliver energy expenditure savings as well as to offset hospital building carbon footprint. EPC practice in government hospitals have managed to offset about 15.7 ktonne carbon emission in 2019 or about 16% of Government building national emission reduction target. Energy project such as energy efficient chiller retrofit, LED lighting retrofit and solar thermal hot water are some of the EPC initiatives by MOH in public hospitals. The energy projects not only serve to meet the overall Hospital Facility Management Contract sustainability goals but also to complement the green building target for Malaysian Healthcare building by 2025.  The aim of this paper is to review the development of the EPC projects in public healthcare sector and its impact on government energy spending as well as to the climate

Short run and long run Ricardian equivalence: an evidence from Malaysia

This paper aims to test the validity of Ricardian equivalence in Malaysian economy with respect to the behavior of government debt and government spending on private consumption. To conduct the test, we choose Giorgioni and Holden (2003) model based on Bernheim (1987) model modifications. Auto-Regressive Distributed Lags (ARDL) Bounds test approach is employed to estimate the model in order to capture the hypothesis existence both in short run and long run. Consequently, the results show that the existence of Ricardian equivalence hypothesis is statistically rejected both cases. It also shows that Malaysians perceive government debt as net wealth and the government spending itself gives complementarity effect on private consumption. Therefore, Malaysian fiscal policy is a good macroeconomic stabilization tool to foster incessant economic growth

Sexual identity: effeminacy among university students

The study focuses on the effeminate male students of the university. The phenomenon of effeminate male students on some university campusses has become a matter of concern. It is presumably the first study of such students at an institution of higher learning. It started before this issue became a subject of debate in newspapers. The study consists of an introduction; three chapters on empirical findings pertaining to students' perceptions of effeminate male students, the psychological profile of effeminates in comparison to normal male and female students, and qualitative interviews with both the effeminates and their friends; a conclusion and seven appendices. The experts attributed sexual identity disorder to the influence of nature and nurture. They distinguished between the genetically effeminate males and those who deliberately become effeminates. It is latter that should be guided in order to eliminate their sexual identity confusion and protect the society

Analysis of students design activities towards biomimicry conceptual design

The creation of a new idea is crucial in many aspects of thinking. An improvement in method of thinking process these days has been producing a lot of novelty in design circumstances. Design thinking is often and very much influenced by design work. Nowadays, there are many research fieldworks use design thinking process to explain certain arising problems. In this study, we use Biomimicry as an approach to develop students’ design activities. Biomimicry study was highlighted when many solutions have been successfully implemented using this method in various fields of work nowadays. Biomimicry was originally formed by two different Greek root words which are “bios‟ meant life and “mimesis” which means imitate. Now, many have started to recognize the importance of inspirations of nature since a lot of researches have been conducted to understand. Conceptual framework is the basis of understanding in any study or research. This study will be utilising properties specified in the frame work which has been produced in developing the research methods. By using two aspects of study methods which are questionnaire and drawing test as a medium for experimentation and analysis

Combined effect of neolamarckia cadamba leaves and electroporation method on hela cell anti- proliferation process

This study suggests that natural sources may become an important tool in treating cancer. Neolamarckia cadamba (NC) leaves also well-known as “Anthocephalus Cadamba”, is a precious plant in Ayurvedic medicine. HeLa cells are one of the examples of eukaryotic cells type. It is derived from human cervical cancer cells. This experiment is conducted in different concentrations of NC Leaves (1μg/ml, 5μg/ml, 10μg/ml, 20μg/ml, 30μg/ml, 40μg/ml, 50μg/ml, 60μg/ml, 70μg/ml, 80μg/ml, 90μg/ml and 100μg/ml) for 48 hours. This experiment’s result proves that the anti-cancer properties of the extract of NC leaves are by increasing the concentration of extract, the numbers of cell viability will decrease. For contribution, the process of NC leaves extract will be combined with the electroporation process to investigate the effect on HeLa cell. Electroporation parameters used for this study were (voltage 600v/cm, pulse duration 5ms, single pulse)

Maximum Quasi-Static Indentation Stress Analysis of Flax/Epoxy and Glass/Epoxy Polymer Composites

The use of fibers is growing every day to meet the demands of the industry. Both synthetic and natural fibers offer benefits and drawbacks that are best suited to specific applications. Synthetic fibers are preferable to natural fibers because they have greater mechanical properties. However, in their application, synthetic fibers have a negative influence on the environment as they are not biodegradable. As a result, natural fibers as an alternative will reduce the environmental impact, though their properties are not as good as synthetic fibers. ANSYS APDL, one of the FEA software analysis, is used to perform quasi-static indentation (QSI) tests in this research work. The purpose of this study is to determine the influence of fiber orientations of 0°, 15°, 30°, 45°, 60°, 75°, and 90°, as well as the effect of the supporting ply angle, 0°, on the mechanical properties of Flax FRP composite. For layup sequences of [(+θ,-θ)2]S and [(±θ)2,04]S, it was observed that maximum strength increases from 0° to 90° fiber orientation. Meanwhile, in a QSI test, the highest strength of Flax FRP was found at 45° for both [(+θ,-θ)2]S and [(±θ)2,04]S layup sequences, with 94.20 MPa and 96.80 MPa respectively. The effect of fiber volume fraction, such as Glass FRP composites with fiber volume fractions of 30% and 60% shows that the fiber volume fraction for 60% has a better performance than 30%. Therefore, composites with a higher fiber volume fraction show better maximum strength and lower deformability. The results of modeling and simulation work on Flax FRP composites can aid in the development of new materials that are more sustainable than conventional techniques by anticipating the mechanical behavior of natural FRP composites

Review on load frequency control for power system stability

Power system stability is the capability of power systems to maintain load magnitude within specified limits under steady state conditions in electrical power transmission. In modern days, the electrical power systems have grown in terms of complexity due to increasing interconnected power line exchange. For that, an inherent of controllers were essential to correct the deviation in the presence of external disturbances. This paper hence aims to review the basic concepts of power system stability in load frequency control. Various control techniques were analyzed and presented. Power system stability can be classified in terms of method to improve power system stability, which are rotor angle stability, frequency stability and voltage stability. It is found that each method has different purpose and focus on solving different types of problem occurred. It is hoped that this study can contribute to clarify the different types of power system stability in terms of where it occurs, and which is the best method based on different situation

Maximum Quasi-Static Indentation Stress Analysis of Flax/Epoxy and Glass/Epoxy Polymer Composites

The use of fibers is growing every day to meet the demands of the industry. Both synthetic and natural fibers offer benefits and drawbacks that are best suited to specific applications. Synthetic fibers are preferable to natural fibers because they have greater mechanical properties. However, in their application, synthetic fibers have a negative influence on the environment as they are not biodegradable. As a result, natural fibers as an alternative will reduce the environmental impact, though their properties are not as good as synthetic fibers. ANSYS APDL, one of the FEA software analysis, is used to perform quasi-static indentation (QSI) tests in this research work. The purpose of this study is to determine the influence of fiber orientations of 0°, 15°, 30°, 45°, 60°, 75°, and 90°, as well as the effect of the supporting ply angle, 0°, on the mechanical properties of Flax FRP composite. For layup sequences of [(+θ,-θ)2]S and [(±θ)2,04]S, it was observed that maximum strength increases from 0° to 90° fiber orientation. Meanwhile, in a QSI test, the highest strength of Flax FRP was found at 45° for both [(+θ,-θ)2]S and [(±θ)2,04]S layup sequences, with 94.20 MPa and 96.80 MPa respectively. The effect of fiber volume fraction, such as Glass FRP composites with fiber volume fractions of 30% and 60% shows that the fiber volume fraction for 60% has a better performance than 30%. Therefore, composites with a higher fiber volume fraction show better maximum strength and lower deformability. The results of modeling and simulation work on Flax FRP composites can aid in the development of new materials that are more sustainable than conventional techniques by anticipating the mechanical behavior of natural FRP composites

Protein-solvent interaction and simulation studies of solvent stable and thermostable lipase from Bacillus strain 42 in water-solvent mixtures

A purified solvent stable and thermostable recombinant lipase, Lip 42, isolated from Bacillus sp. strain 42 was previously shown to be stable in polar organic solvents such as dimethyl sulfoxide (DMSO) and methanol. Stabilities in different solvent compositions were studied based on 40˚C pre-incubation in solvent and the purified lipase was shown to retain at least 100% residual activity in up to 45% v/v DMSO and 45% v/v methanol. In 60% v/v DMSO, 68% of residual activity was retained, however, this dramatically reduced to 6.5 % at 65% v/v DMSO. Activity enhancement was recorded at lower solvent composition (less than 45% v/v solvent), whereby, at 30% v/v DMSO, enhancement was recorded to be as much as 35%. Enhancement tends to increase as temperature increases. Based on these solvent stability margin, molecular dynamic simulations were then carried out in the presence of water, 60% v/v DMSO + 40% v/v water and 100% v/v DMSO, by using a structure model predicted from a highly homologous (97%) lipase (PDB:1JI3). Results showed that the Lip 42 structure was retained and the flexibility of polypeptide backbone decreased or increased depending on the location of loop regions. Flexibility changes in the helixloop-helix-motif covering catalytic triad were found to be associated with a hydrophobic cluster region. The presence of 60% v/v DMSO resulted in the disorganization of the cluster, accompanied with non-native H-bonds formations. However, the cluster still presents in 100% v/v DMSO and resembles to that of water simulation. Mutant form of lip 42 V174S contains residue substitution near the cluster and within helix-loop helix motif. At 50˚C pre-incubation, the mutant lost as much of high temperature enhancement commonly observed in low DMSO composition. This indicates the potential role of hydrophobic residues in helix-loophelix motif and the cluster in interfacial activation