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Characteristic of Induction Motor Drives Fed by Three Leg and Five Leg Inverters
Talib, Md. Hairul Nizam,Ibrahim, Zulkifilie,Rahim, Nasrudin Abd.,Hasim, Ahmad Shukri Abu The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
This paper aims to compare the performance of three phase induction motor drives using Five Leg Inverter (FLI) and Three Leg Inverter (TLI) configurations. An Indirect Field Oriented Control (IFOC) method using a TLI is well established and incorporated for high performance speed drives in various industries. The FLI dual motor drive system on the other hand shows good workability in the independent control of two induction motor drives simultaneously. In this experiment, the IFOC method is utilized for both drive systems, and Space Vector Pulse Width Modulation (SVPWM) is used to generate pulses for both inverters. For the FLI, the Double Zero Sequence (DZS) Injection technique is used to generate the modulation signal. The complete experiment setup is done by using a DSpace 1103 controller board. The individual motor performances are analyzed using similar schemes, equipment setups and controller parameter values. The results show similar speed performance response capability between the single motor operation using a TLI system and the two motor operation using a FLI system based on the variable speed range either in forward or reverse operation. They also show similar load rejection abilities. However, the single motor with a TLI has a better power quality aspect such as ripple current and total harmonics distortion (THD).
Multimodality Imaging Features of Cardiac Fungal Infection: A Case Report
Talib Norain,Mohammed Yusri,Abas Sharipah Intan S. SY.,Ramli Kama Azira Awang 아시아심장혈관영상의학회 2019 Cardiovascular Imaging Asia Vol.3 No.4
We present a 38-year-old man with hepatitis C and history of intravenous drug use who presented with fever and hemoptysis. Initial chest CT showed bronchiectasis with an intracavitary lesion consistent with invasive lung aspergillosis in the background of a previously treated tuberculosis infection. Subsequently, he developed cardiac failure symptoms, and transthoracic echocardiogram revealed a left ventricle (LV) apical lesion mimicking a thrombus or vegetation. However, cardiac MRI suggested a fungating apical lesion in the LV, which showed gradual enhancement at the peripheral lesion while sparing the central core in the first-pass perfusion sequence. The long inversion time (600 milliseconds) of the late gadolinium sequence confirmed presence of persistent peripheral enhancement suggestive of an infective focus rather than a thrombus. The intracardiac lesion was compatible with a left ventricular fungal lesion or aspergilloma consistent with a positive serum galactomannan assay. The patient refused surgical intervention. Despite a long course of antifungal therapy, he succumbed to death three weeks after completion of treatment due to disease complications.
Talib Mohammed Albayati,Ghanim Magbol Alwan,Omar Sabah Mahdy 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.1
The Magnetic nanoporous material Fe/MCM-41 was prepared, and its physical characterization studied, to determine the effect of its properties on separation efficiency of methyl orange (MO) from wastewater by adsorption process. The experimental results were analyzed for both adsorbent mesoporous material samples, MCM-41 and magnetic Fe/MCM-41, in order to select the best operating conditions for the different studied parameters, which are: constant temperature (20 oC), pH: (2) adsorbent dosage (0.03 gm), contact time (10minute) and concentrations (30mg/L). The results demonstrate that the adsorption processes can be well fitted by the Langmuir isotherm model for pure MCM-41, with a correlation coefficient of (0.999), and fitted by the Freundlich isotherm model for magnetic Fe/ MCM-41, with a correlation coefficient of (0.994). The adsorption kinetics of MO on to MCM-41 and Fe/MCM-41 are well described by a pseudo-second-order kinetic model.
Talib, Md Hairul Nizam,Ibrahim, Zulkifilie,Rahim, Nasrudin Abd.,Abu Hasim, Ahmad Shukri The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
This paper presents the implementation of two-arm modulation (TAM) technique for the independent control of a two-induction motor drive fed by a five-leg inverter (FLI). A carrier-based space vector pulse width modulation technique for TAM is proposed to generate switching signals for FLI. Two independent three-phase space vector modulators are utilized to control two motors. The motor drive system applies two separate indirect field-oriented control methods. The stationary voltage outputs from the vector control are synthesized in the three-phase space vector modulator to generate switching signals for FLI. The performance of the independent control of the motors and the voltage utilization factor are likewise analyzed. Simulation and experimental results verify the effectiveness of the proposed method for the independent control of the two-motor drive system. The proposed technique is successfully validated by dSPACE DS1103 experimental work.
Norain Talib,Kama Azira Awang Ramli,Yusri Mohammed 아시아심장혈관영상의학회 2021 Cardiovascular Imaging Asia Vol.5 No.3
A 27-year-old pregnant female presented to our clinic for a cardiac murmur that was detected during an antenatal check-up. She had no cyanosis, and she was asymptomatic for heart failure. The echocardiogram revealed an enlarged right coronary sinus with right coronary artery (RCA) dilatation. The electrocardiographic-gated coronary computed tomography angiogram showed aneurysmal RCA dilatation with fistula to the inferobasal region of the right ventricle. A few small thrombi were visualized in the right ventricle and within the fistula. She delivered a healthy baby via caesarean section at 31 weeks of gestation, and fistula correction was planned within one year.
Strategic Facilities Management Concept for Resilient Hospital; Australian Case Studies
Abdul Talib, Yuhainis 한국생태환경건축학회 2021 한국생태환경건축학회 학술발표대회 논문집 Vol.21 No.2
The objective of this paper is to identify the relationship between Facilities Management Business Operation and facilities management support services delivery (FMssd). A public healthcare organisation in regional Victoria was used as a case study. A quantitative method approach is used with strategies for inquiry that multiples regression technique. The questionnaires were distributed Hospital staffs in the organisation. Three dimensions of healthcare management were evaluated in clusters of variables: business organisation management, facilities management operation system and decision-making process. The data was analysed using a statistical tool (SPSS 22). The method used is a standard multiple regression. The healthcare management has to understand the nature of every FMssd item better. This paper has found a strong idea and understanding of the link between operational management and organisational management in order to understand how to effectively manage healthcare buildings facilities better.
Buraq Talib Shalash AL‑Mosawi,David Wexler,Andrzej Calka 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Al-matrix composites reinforced with variant quantity of milled carbon fibers (MCFs) were manufactured via uniball magnetomilling and uniaxial hot pressing (UHP). Cylindrical compacts of these composites were produced at approximately600 °C for 15 min and 70 MPa uniaxial pressure in an argon atmosphere. The microstructure of powders and consolidatedcomposite samples were studied by X-ray diffractometry and field emission scanning electron microscope with energy dispersivespectroscopy. The physical and mechanical properties of the bulk samples were estimated by Archimedes density,Vickers microhardness, modulus of elasticity, maximum compressive strength, yield strength, nanoindentation, and specificwear rate. Results show that Al + 20 vol% of MCFs has a higher compressive strength of (710 ± 32) MPa and modulus ofelasticity of (15 ± 2) GPa compared to other composites and unreinforced Al sample. There are several factors that couldbe participate in improving the composite properties. These reasons included enhanced interface between Al matrix andMFCs, free of porosity, refined microstructure, and improved wetting between MFCs and Al matrix. Also, the specific wearrate of the composite was decreased when the MCFs volume fraction increases from 5 to 20%. This might propose thatMFCs reduced the wear of the composites by acting as a self-lubrication material and might be suggested when using thesetypes of composites in components sliding against hard surface. The notable composite properties were found at processingparameters of 50 h milling time and UHP at 600 °C for 15 min under 70 MPa applied pressure.
Mohd Talib Latif,Kasturi Dewi Kaniiah,Murnira Othman,Doreena Dominick,Anis Asma Ahmad Mohtar,Nor Syamimi Sufiera Limi Hawar,Zaman, Nurul Amalin Fatihah Ka,Dimitrios G. Kaskaoutis 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
The spread of virus-related illnesses due to COVID-19 has been associated with the presence of the virus in water droplets released from infected individuals through processes such as coughing, sneezing and taking. Studies also indicated the potential for airborne transmission of COVID-19 especially within indoor environment. The level of air pollutants such particulate matter with aerodynamic diameter below than 2.5 micrometres (PM2.5) showed a significant relationship with the COVID-19 cases in many countries. On the other side, the lockdown due to COVID-19 pandemic has led to a notable decrease in atmospheric pollutants. Measurement of aerosols using satellite image in Southeast Asia shows a significant reduction of aerosols optical depth (AOD) during lockdown due to COVID-19 pandemic. In Malaysia based on ground level measurement, the concentration of PM10, PM2.5, NO₂, SO₂, and CO concentrations have been decreased by 26-31%, 23-32%, 63-64%, 9-20%, and 25-31%, respectively during the lockdown phase, compared to the same periods in 2018 and 2019. Surface ozone (O3) especially in urban area is the only gas that shows an overall increasing trend during the lockdown. Further investigation using diurnal patterns showed that NO₂ and CO were both reduced significantly during the rush hours, indicating how a reduction in motor vehicles on the roads influences the levels of these pollutants.