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Combining Total Geological History and Other Approaches in Resolving Construction Dispute
( Abd Rasid Jaapar ),( Afiq Farhan Abd Rahim ),( Mohd Farid Mohd Dali ),( Dharam Singh ),( Mohd Fadhil Jasmee ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
A dispute arose between Project Owner and Contractor over payment of the completed earthworks. The dispute was referred to arbitration on the volume of geomaterial had been excavated. Basically, it was an old issue on rock or no rock! The Contractor claimed the geomaterial is rock while the Project Owner claimed the geomaterial is not rock. A multidisciplinary geo-team, including engineering geologists, geotechnical engineers and GIS analysts was gathered to prepare the report. The approaches to the arbitration case used were the application of the total geological history, rock strength and SPT N-value to classify the ground while GIS was used to calculate the volume of geomaterial. The site-specific geological model is based on consideration of the regional and local geological and geomorphological history and of the current ground surface conditions. Results from boreholes were studied together with separate laboratory testing results of rock samples collected by the client during construction works. Extrapolation of rockhead was based on UCS ≥ 50 N60 (kPa). The volume calculation of rocks excavated was conducted using boreholes where rockhead had been identified together with as-built ground level (finish level). In this paper, the practical strategies involved in the total geology history approach as well as rock strength and SPT N-value are identified by describing its application for construction dispute.
( Abd Rahim Huda-shakirah ),( Yee Jia Kee ),( Abu Bakar Mohd Hafifi ),( Nurul Nadiah Mohamad Azni ),( Latiffah Zakaria ),( Masratul Hawa Mohd ) 한국균학회 2019 Mycobiology Vol.47 No.4
Crinum asiaticum and Hymenocallis littoralis, commonly known as spider lilies are bulbous perennial and herbaceous plants that widely planted in Malaysia as ornamental. During 2015-2016, symptom of leaf blight was noticed on the hosts from several locations in Penang. The symptom appeared as irregular brown to reddish lesions surrounded by yellow halos. As the disease progressed, the infected leaves became blighted, dried, and fell off with the presence of black microsclerotia and pycnidia on the lesions parts. The present study was conducted to investigate the causal pathogen of leaf blight on C. asiaticum and H. littoralis. Based on morphological characteristics and DNA sequences of internal transcribed spacer (ITS) region and translation elongation factor 1-alpha (TEF1-a) gene, the causal pathogen was identified as Macrophomina phaseolina. Phylogenetic analysis of combined dataset of ITS and TEF1-a grouped the isolates studied with other isolates of M. phaseolina from GenBank. The grouping of the isolates was supported by 96% bootstrap value. Pathogenicity test proved the role of the fungus in causing leaf blight on both hosts.
Wahidah Abd. Halim,Nasrudin Abd. Rahim,Maaspaliza Azri 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.3
This paper presents an implementation of selective harmonic elimination (SHE) modulation for a single-phase 13-level transistor-clamped H-bridge (TCHB) based cascaded multilevel inverter. To determine the optimum switching angle of the SHE equations, the Newton-Raphson method is used in solving the transcendental equation describing the fundamental and harmonic components. The proposed SHE scheme used the relationship between the angles and a sinusoidal reference waveform based on voltage-angle equal criteria. The proposed SHE scheme is evaluated through simulation and experimental results. The digital modulator based-SHE scheme using a field-programmable gate array (FPGA) is described and has been implemented on an Altera DE2 board. The proposed SHE is efficient in eliminating the 3<SUP>rd</SUP>, 5<SUP>th</SUP>, 7<SUP>th</SUP>, 9<SUP>th</SUP> and 11<SUP>th</SUP> order harmonics, which validates the analytical results. From the results, it can be seen that the adopted 13-level inverter produces a higher quality with a better harmonic profile and sinusoidal shape of the stepped output waveform.
THREE-PHASE AC TO DC BUCK CONVERTER WITH SINUSOIDAL INPUT CURRENT AND UNITY POWER FACTOR
Nasrudin abd.Rahim 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
This paper present a prototype design of the schematic diagram of the proposed three-phase power converter operated as a buck converter where the output voltage. A prototype design is tested to demonstrate low input current distortion at sinusoidal current waveform with controllable displacement factor. The power bridge configuratron consists of six controllable switches and six diodes with an additional of one freewheeling diode across the bridge voltage The simulation and experimental results are provided to demonstrate the effectiveness of the design.
Wahidah Abd. Halim,Nasrudin Abd. Rahim,Maaspaliza Azri 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
This paper presents a simple approach for the selective harmonic elimination (SHE) of multilevel inverter based on the transistor-clamped H-bridge (TCHB) family. The SHE modulation is derived from the sinusoidal voltage-angle equal criteria corresponding to the optimized switching angles. The switching angles are computed offline by solving transcendental non-linear equations characterizing the harmonic contents using the Newton-Raphson method to produce an optimum stepped output. Simulation and experimental tests are conducted for verification of the analytical solutions. An Altera DE2 field-programmable gate array (FPGA) board is used as the digital controller device in order to verify the proposed SHE modulation in real-time applications. An analysis of the voltage total harmonic distortion (THD) has been obtained for multiple output voltage cases. In terms of the THD, the results showed that the higher the number of output levels, the lower the THD due to an increase number of harmonic orders being eliminated.
Halim, Wahidah Abd.,Rahim, Nasrudin Abd.,Azri, Maaspaliza The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
This paper presents a simple approach for the selective harmonic elimination (SHE) of multilevel inverter based on the transistor-clamped H-bridge (TCHB) family. The SHE modulation is derived from the sinusoidal voltage-angle equal criteria corresponding to the optimized switching angles. The switching angles are computed offline by solving transcendental non-linear equations characterizing the harmonic contents using the Newton-Raphson method to produce an optimum stepped output. Simulation and experimental tests are conducted for verification of the analytical solutions. An Altera DE2 field-programmable gate array (FPGA) board is used as the digital controller device in order to verify the proposed SHE modulation in real-time applications. An analysis of the voltage total harmonic distortion (THD) has been obtained for multiple output voltage cases. In terms of the THD, the results showed that the higher the number of output levels, the lower the THD due to an increase number of harmonic orders being eliminated.
Halim, Wahidah Abd.,Rahim, Nasrudin Abd.,Azri, Maaspaliza The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.3
This paper presents an implementation of selective harmonic elimination (SHE) modulation for a single-phase 13-level transistor-clamped H-bridge (TCHB) based cascaded multilevel inverter. To determine the optimum switching angle of the SHE equations, the Newton-Raphson method is used in solving the transcendental equation describing the fundamental and harmonic components. The proposed SHE scheme used the relationship between the angles and a sinusoidal reference waveform based on voltage-angle equal criteria. The proposed SHE scheme is evaluated through simulation and experimental results. The digital modulator based-SHE scheme using a field-programmable gate array (FPGA) is described and has been implemented on an Altera DE2 board. The proposed SHE is efficient in eliminating the $3^{rd}$, $5^{th}$, $7^{th}$, $9^{th}$ and $11^{th}$ order harmonics, which validates the analytical results. From the results, it can be seen that the adopted 13-level inverter produces a higher quality with a better harmonic profile and sinusoidal shape of the stepped output waveform.
Airee Afiq Abd Rahim,Shahrum Abdullah,Salvinder Singh Karam Singh,Mohammad Zaki Nuawi 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
This paper discusses the determination of the optimum decomposition level by using the discrete wavelet transform (DWT) method for an automobile suspension system. The DWT method has been widely adopted in signal processing analyses. For the purpose of this study, a car was driven on two types of road conditions: highway and bumpy. Strain signals were measured based on the response gained from the coil spring. These signals were decomposed into 14 levels of decomposition, in which the percentage of wavelet energy for Levels 1 through 4 were 100 % similar to the original signals for both roads. The results were evaluated by comparing the fatigue life values for each decomposition level to the original signal. Based on the comparison of both roads, levels 1 to 3 show a difference of less than 20 % in fatigue life compared to the original signal. Thus, the accuracy of wavelet-based signal processing has proven to be applied in the fatigue durability analysis for automotive applications.
Three-Phase PWM-Switched Autotransformer Voltage-Sag Compensator Based on Phase Angle Analysis
Mansor, Muhamad,Rahim, Nasrudin Abd. The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.6
Many voltage sag compensators have been introduced, including the traditional dynamic voltage restorer (DVR), which requires an energy storage device but is inadequate for compensating deep and long-duration voltage sags. The AC-AC sag compensators introduced next do not require a storage device and they are capable of compensating voltage sags. This type of compensator needs an AC-AC converter to regulate the output voltage. Presented in this paper is a three-phase PWM-switched autotransformer voltage sag compensator based on an AC-AC converter that uses a proposed detection technique and PWM voltage control as a controller. Its effectiveness and capability in instantly detecting and compensating voltage sags were verified via MATLAB/Simulink simulations and further investigated through a laboratory prototype developed with a TMS320F2812 DSP as the main controller.