A Fuzzy Logic Based Power Management System for a Hybrid Microgrid

A fuzzy logic-based power management system for a hybrid microgrid is designed in this paper. This designed system is capable to manage the generations considering the load conditions. Consequently, a balance is maintained between generations and load. Furthermore, the system is capable to monitor and manage the storage system charging and discharging as well as to support the external load by sharing power as per considering the situation. Moreover, to make this system more efficient it is such designed that, the storage system will not take any energy from the conventional generation units of the microgrid. Additionally, it is also ensured that, no power will be delivered to the external load utilizing storage or generator. The “Fuzzy Logic Designer” toolbox of MATLAB is used to observe the relationship between the input and output variables, after establishing the fuzzy sets and rules. Furthermore, transferring the fuzzy data sets and rules to MATLAB Simulink and performing different case studies, the effectiveness of the designed system is verified numerically

Roommate matching system by applying a pyramick model / Aqil Izzuddin Shamsul Arifin

College Administrative that are located in the University Teknologi Mara Kampus Jasin are having a problem when the new student wants to register in the college. The college administrative does not have any computerized system that could help to overcome this problem. The company also does not keep any student information in the computerized system. Besides, all universities around Malaysia have been using random matching system in order to match roommate for new students in every semester. This project is named as e-Roommatch. The requirements for this project were collected by questionnaire and interview of the stakeholder and the student itself. Students will be registered to their room in order from the first empty room till the last one. Through the research that had been done in developing a Roommates Matching System using the concept of metaphysics science, which is known as PYRAMICK Technique which uses the date of birth value as the parameter is a systematic way to know the background of students so that we can find the matching partner or roommate for them. This is to reduce the conflicts among roommates which may affect their studies. It is hoped this system would help students have a better roommate and will help in their studies. For the future work it is suggested that this system combines other techniques using psychological methods such as "Rahsia Bulan Kelahiran" and “Personaliti Warna”. By using more than one technique, this system is expected to provide better result in order to match student’s roommate

Complete Load Analysis of a residential Hall of CUET in Bangladesh and Design of a Roof Top Solar PV System

In this paper a complete load analysis of a residential hall of CUET in Bangladesh is performed, and a roof top solar PV System is designed. At first the load of this building is estimated, and a complete daily load profile is developed. Using the estimated load profile, the size of solar array and other components are estimated. After that, a complete system is designed connecting the components of estimated rating and size. Additionally, an optimization of system is performed using HOMER. Furthermore, the dynamic response of the proposed system is analyzed using Simulink, MATLAB and based on this response essential control and protection schemes are incorporated with the system. The effectiveness of these schemes is also verified by MATLAB simulation

Input switched closed-loop single phase SEPIC controlled rectifier with improved performances

DC power supply has become the driving source for some essential modern applications. Thereby, DC power conditioning has become a significant issue for engineers. Typically used rectifiers associated with a bridge structure is nonlinear in nature. Thereby, the current at input side of the rectifier contains harmonics, which also flow through the power line. The presence of harmonics causes several interruptions and reduce power quality. In this regard, a new close loop SEPIC controlled rectifier is proposed in this paper. The conventional scheme is arranged with a rectifier connected to a DC-DC converter, which is an open loop system. Consequently, such system cannot regulate voltage at load varying condition. The proposed SEPIC controlled rectifier can regulate voltage under load varying condition for a wide range. Additionally, the performance in terms of total harmonic distortion (THD) of input current and power factor at AC side are also within satisfactory range for the closed loop configuration. The controlled rectifier has four operating phases associated with switching states and input voltage polarity. The close loop configuration also incorporates a current and a voltage loop at the feedback path. The comparative studies have been performed among the proposed closed loop construction, the open-loop structure as well as the conventional construction. The effectiveness of the proposed controlled rectifier is verified in terms of THD and input power factor considering the results obtained from simulation

A Study on the Causes of Work Stress among Malaysia Civil Defense Force (MCDF) Personnel

Life in the modern world today is full of frustrations, demands and deadlines as stress has become a norm for many people. Since the harsh episode of the pandemic, stress is the normal physical response that disturbs our balance. Many experienced work-related ill health cases due to work-related stress, depression and anxiety. Therefore, work stress is inevitable. Work stress is increasing in Malaysia, especially since the pandemic and it continues to pose a major global health threat until now. Alarmingly, stress has become a modern epidemic and has influenced poor public health. Many past researches reviewed the prevalence of occupational stress and the causes of its prediction among the Malaysian population and found many occupational stress severe incidents. The Malaysian government mobilized the Malaysia Civil Defense Force (MCDF) for several responsibilities to save lives and properties. Based on the nature of MCDF work, stress is a major issue. There are many factors of stress; operational, organizational and lifestyle to name a few. Organizational stress highlights employees’ attachment to the organization, operational stress highlights employees' experience doing the work, and lifestyle stress highlights individual ways of living. Therefore, the researchers attempt to examine the relationships between operational, organizational and lifestyle factors and the most influencing factor that may cause stress among a population of 180 personnel of MCDF, while carrying out their work assignments in Klang Valley

Enhancing properties of fe-cr-alumina composites prepared by powder metallurgy / Saidatulakmar Shamsuddin ... [et al.]

Fe-based matrix composites have shown the potential for use as advanced materials for technological applications. In this study metal matrix composites (MMCs) of Fe-Cr –alumina were fabricated by powder metallurgy (PM). The effect of alumina content on the physical and mechanical properties of the composites was investigated. Scanning Electron Microscope (SEM) showed a homogeneous distribution of alumina in the matrix. Energy Dispersive X-ray (EDX) displayed the presence of Fe, Cr and alumina in the composites. Optimum condition of the composites was examined by evaluation of the parameters such as density, porosity, shrinkage, hardness, wear resistance and compressive strength. Results showed that addition of alumina greater than 5 wt. % decreased the density but increased porosity. Hardness and wear resistance of the composites increased with increasing alumina content to 20 wt. %. However, the compressive strength showed optimal value at 5 wt. % alumin

Observing the simulation behaviour of Magnesium alloy metal sandwich panel under cyclic loadings

This study aims to investigate the delamination effect of a metal sandwich panel using a four-point bending simulation under continual spectrum loading. The most recent core designs of the sandwich panel have a cavity that can increase vulnerability in terms of bonding strength under constant cyclic loading. The sandwich panel is simulated under constant cyclic loading using different core design configurations, which are rounded dimple, hemispherical dimple, and smooth surface core design. There are two types of conditions used; no pre-stress and pre-stress loads with variable stress ratios based on Gerber stress life theory. Results showed that dimple core design enhanced mechanical behaviour and fatigue life performance about 33% and 5%, respectively, compared to the sandwich panel with a smooth surface core design. It is highlighted that modification on the surface of core design could be beneficial to enhance the bonding strength performance of sandwich panels and prevent early delamination under extreme conditions such as constant cyclic loading. This study is beneficial to enhance the bonding strength for sandwich panels against extreme conditions such as high impact load and continuous cyclic load

The Effect Of Diesel And Bio-Diesel Fuel Deposit Layers On Heat Transfer

The adhesion of deposits on the combustion chamber wall surface affecting the heat transfer process in an engine that cause engine knock, increase NOx and increase soot generation during the combustion process. The effect will be more significant when utilizing bio-diesel fuel due to its higher density and viscosity. Thus, this study is intended to investigate the effect of diesel and bio-diesel fuels deposit layers on heat transfer. In this study, deposit layer of diesel fuel (DF) and 5% palm oil based bio-diesel fuel blends (B5) were prepared for surface temperature at 250°C and 357°C by using a hollow cylinder heater. Then, the hollow cylinder covered with deposit layer in its inner surface was inserted in a heat transfer chamber apparatus to investigate its effect on heat transfer to surrounding. Deposit layer for DF that was prepared at surface temperature of 357°C was able to act as insulator which prevents the heat from transferring to the surrounding compared to deposit layer formed at lower surface temperature. However, deposit layer of B5 prepared at surface temperature of 250°C have better insulator properties compared to DF at the same surface temperature

The Etiology of Childhood Pneumonia in The Gambia: Findings From the Pneumonia Etiology Research for Child Health (PERCH) Study

BACKGROUND: Pneumonia remains the leading cause of death in young children globally. The changing epidemiology of pneumonia requires up-to-date data to guide both case management and prevention programs. The Gambia study site contributed a high child mortality, high pneumonia incidence, low HIV prevalence, Haemophilus influenzae type b and pneumococcal conjugate vaccines-vaccinated rural West African setting to the Pneumonia Etiology Research for Child Health (PERCH) Study. METHODS: The PERCH study was a 7-country case-control study of the etiology of hospitalized severe pneumonia in children 1-59 months of age in low and middle-income countries. Culture and nucleic acid detection methods were used to test nasopharyngeal/oropharyngeal swabs, blood, induced sputum and, in selected cases, lung or pleural fluid aspirates. Etiology was determined by integrating case and control data from multiple specimens using the PERCH integrated analysis based on Bayesian probabilistic methods. RESULTS: At The Gambia study site, 638 cases of World Health Organization-defined severe and very severe pneumonia (286 of which were chest radiograph [CXR]-positive and HIV-negative) and 654 age-frequency matched controls were enrolled. Viral causes predominated overall (viral 58% vs. bacterial 28%), and of CXR-positive cases respiratory syncytial virus (RSV) accounted for 37%, Streptococcus pneumoniae 13% and parainfluenza was responsible for 9%. Nevertheless, among very severe cases bacterial causes dominated (77% bacterial vs. 11% viral), led by S. pneumoniae (41%); Mycobacterium tuberculosis, not included in "bacterial", accounted for 9%. 93% and 80% of controls ≥1 year of age were, respectively, fully vaccinated for age against Haemophilus influenzae and S. pneumoniae. CONCLUSIONS: Viral causes, notably RSV, predominated in The Gambia overall, but bacterial causes dominated the severest cases. Efforts must continue to prevent disease by optimizing access to existing vaccines, and to develop new vaccines, notably against RSV. A continued emphasis on appropriate case management of severe pneumonia remains important