Sustainable power supply using solar energy and wind power combined with energy storage

The idea of integrating intermittent sources of energy such as solar and wind with energy storage has several benefits for the electricity grid. The first benefit is that energy storage can help the grid during the periods that grid is facing high peak demand. The second benefit is that using energy storage would help shifting the grid load from peak and busy time to a less demand time. And the third benefit is that using energy storage would help smoothing the variations in power generation fed into the grid by variable and intermittent renewable resources. The third benefit is of particular important because in future more renewable energy sources will be integrated into the electricity grid worldwide. The objective of this paper is to present the results of a study conducted to examine the potential role and potential benefits of energy storage integrated into intermittent sources. Using energy storage will provide an opportunity to create a sustainable power supply, and to make the electricity grid more reliable especially with large proportion of grid-connected renewable sources

Benefits of electric vehicle integrated into the electricity network

Electric Vehicle (EV) can be integrated into the electricity network (Grid) easily and conveniently. Electric vehicles present a new demand for electricity during the periods that they need to be charged and also can play an important role as distributed storage devices that could supply electric power back into the grid. One of the benefits is that EV can help the electricity network during those periods that network is facing peak demand. The second benefit is that EV would be able to help shifting the grid load from high-demand time to a low-demand time. The third benefit is that EV would help smoothening variations in power generation caused by variable and intermittent renewable sources such as solar energy and wind power. This benefit is very important because in the near future we will see more renewable and intermittent energy sources will be connected to the so called smart grid. The objective of this talk is to present the results of a study conducted to examine the potential benefits of electric vehicles as distributed energy storage devices in a smart grid environment. In this talk the issues, challenges, and evaluating potential values of the EV’s batteries to the electricity grid will be discussed

Developing a method to accurately estimate the electricity cost of grid-connected solar PV in Doha

Solar photovoltaic electricity is more expensive compared with conventional electricity at retail level. As a result, general public members do not find the solar PV electricity an attractive option to use for generating a portion of their electricity need. To promote PV electricity utilization and to make it more attractive, Governments of some countries like Germany, Japan, USA, Australia, and etc. have introduced solar PV incentive programs. Most of grid-connected photovoltaic (PV) systems on residential or commercial buildings in these countries are installed by individuals interested in generating part of their electricity emissionfree. For some of these people the economics of the PV electricity is likely to be of secondary importance, while majority of them would like to see financial return to become interested to use PV electricity. The objective of this paper is to present the results of a study conducted on the economic aspects of solar PV to estimate the electricity price of grid-connected rooftop PV system under climate conditions and geographical location of Doha, to see if the use of PV electricity is attractive and affordable by residential customers. The results of this study will help to determining an appropriate feed-in tariff for solar PV electricity in Doha

Computational modelling ofthe reflectivity of AlGaAs/GaAs and SiGe/Si quantum well solar cells

In this paper the modelling ofthe reflectivity of two quantum well solar cells (QWSC) are theoretically developed and computationally analysed. The new reflectivity model is based on the Modified Single Effective Oscillator model combined with Fresnel’s equation. The model takes into consideration the effects of the design parameters including concentration levels, structural properties ofthe device (well length, etc.), operating temperature and electric field effects. The results generated are for a bare AlGaAs/GaAs cell and the same cell with a ZnS antireflection coating (ARC). Further investigations include a bare SiGe/Si cell and the same cell with a Ta2O5 ARC. The results generated are accurate and match with experimental data for similar cells. The analysis is performed for AM 1.5 spectrum. The model is intended to be an aid to QWSC designers

Kinematic Analysis of the Triangle-Star Robot with Telescopic Arm and Three Kinematics Chains as T-S Robot (3-PRP)

In this chapter, the limitations and weaknesses of the motion geometry and the workspace of Triangle-Star Robot {T-S (3-PRP)} are diagnosed after research and consideration of the issues at hand. In addition, they are offered in index form. To remove the problems with the abovementioned cases, at first, a robot with telescopic arms and a similar kinematics chain is rendered to give a kinematics analysis approach like Hartenberg-Denavit. Furthermore, in order to increase the workspace, Reuleaux Triangle-Star Robot {RT-S (3-PRP)} with kinematics chains 3-PRP and Circle-Star Robot{C-S (3-PRP)} with kinematics chains 3-PRP and a new improved structure are introduced

Factors associated with uncomplicated prolonged neonatal jaundice in term Malay infants : a case control study

Aim: To determine factors associated with uncomplicated prolonged neonatal jaundice in Malay term infants. Methods: A case-control study was conducted in 120 prolonged neonatal jaundice infants and 120 healthy control infants, in a pediatric clinic of a tertiary center between February 2018 and September 2018. Cases were selected from specialized prolonged jaundice clinic while, controls were healthy infants conveniently selected from neonatal clinic. Data was gathered from caretaker interviews, home-based vaccination records, and attending physician records. Regression analysis was performed to determine the independent associated factors of prolonged unconjugated jaundice. Results: Hundred and twenty infants with prolonged unconjugated jaundice was analyzed in this study, of which 44.2% jaundice had resolved upon reviewed at 31 days of life. Cases and control age between 2 weeks to 8 weeks. Univariate analysis demonstrated potentialassociations observed in maternal history of gestational diabetes mellitus, maternal intrapartum usage of oxytocin,vaginal versus caesarian delivery,SGA versus AGA birth weight babies, G6PD deficiency,congenital hypothyroidism, and exclusive breastfeeding versus mixed feeding. G6PD deficiency was a predicted risk factor(adjusted OR 5.3 CI 1.02-28.20) for prolonged jaundice with unexpected negative association of congenital hypothyroidism(adjusted OR 0.057 95% CI 0.01-0.72), infant of maternal gestational diabetes mellitus(adjusted OR 0.31 95% CI 0.15-0.65), and SGA birth weight (adjusted OR 0.20 95% CI 0.10-0.396). Conclusion: This study demonstrates positive relationship between G6PD deficiency and prolonged unconjugated jaundice. However, maternal history gestational diabetes mellitus, congenital hypothyroidism and SGA birth weight were protective factors for prolonged unconjugated jaundice in our population

Pengurusan Fasiliti Dalam Penyelenggaraan Bangunan:Amalan Kualiti, Keselamatan dan Kesihatan

Malaysia is a speedy developing country and now struggling to become a developed country with a first class infrastructural network. Towards the vision, various developments have been well planned especially in building construction sectors in order to fulfill the need of society and an organization. In the hasty stream of building construction whether government, private or personal building, the facilities management planning should not be neglected. The planning of building and facilities management before, during and after a building creation must be parallel to maintain the initial condition of the building and to ensure the surrounding of the building is always in good quality, safe and healthy to all occupants or visitors of the building. Practically the construction management only focuses on before and after building construction. Otherwise the facilities management should focus on three levels that are before, during and after construction. Nowadays, many issues reflected to quality, safety and health originated from the weakness of facilities management especially building maintenance aspect such as impairment, fire, collapse, failure compliance of law and so on. Such events will threat the safety and health of the occupants and visitors of buildings. So, the quality, safety and health practices are two essential elements in building maintenance to ensure that all occupants always comfortable, safe and healthy during occupation of a building. This paper discussed a few factors that should be considered by facilities management organization to maintain a good level of quality, safe and healthy of a building. Some of the factors are developing objective, policy and strategy; implementation of planning; providing budget; procedure development, regulation and standard compliance; and human resources