S. M. A. Motakabber
International Islamic University Malaysia
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Featured researches published by S. M. A. Motakabber.
ieee international nanoelectronics conference | 2013
Soheli Farhana; A. H. M. Zahirul Alam; S. M. A. Motakabber; Sheroz Khan
In this paper, graphene electronic structure of carbon nanotubes has been analyzed and validate with past theoretical and experimental results. The energy dispersion relation, effective mass and intrinsic carrier concentration of graphene have been analyzed to build diverse carbon nanotubes. The electronics properties of graphene are subject to change with the different diameters and wrapping angles of carbon nanotubes. Different chiral vector (n, m) of a graphene allows to design carbon nanotube for a wide range of applications, which can be achieved from the analyzed carrier concentration calculation. The proposed calculations set a higher boundary for a wide range of applications including the integration of carbon nanotube internal architecture and carbon nanotube field effect transistors.
ieee business engineering and industrial applications colloquium | 2013
Soheli Farhana; A. H. M. Zahirul Alam; Sheroz Khan; S. M. A. Motakabber
This paper suggests the modeling phenomena of small band-gap Carbon Nanotube (CNT). Device physics of CNT is studied and do the calculation of sub-band for zigzag CNT to model small band-gap tubes. Each carbon nanotube is described as a graphene sheet rolled into a cylindrical shape so that the structure is one dimensional with axial symmetry. A comparison is made with the current literature to show that the proposed chirality CNT with small band-gap which makes faster switching Carbon Nanotube Field Effect Transistor (CNTFET).
IOP Conference Series: Materials Science and Engineering | 2013
Soheli Farhana; A. H. M. Zahirul Alam; S. M. A. Motakabber; Sheroz Khan
In this paper, a Matlab simulator is developed for modelling of carbon Nanotubes (CNTs). First electronics structure is derived and discussed to facilitate the analysis and modelling of the simulator. Then a calculation is done for electron energy dispersion relations for single-wall zigzag CNTs with different tube indexes. From the analysis of energy dispersion relation, it is derived an analytical models for CNT parameters such as the mobility and the intrinsic carrier concentration. Once obtain the CNT parameters, and then import them to the developed simulator. The simulator is based on the semiconductor equations and quantum effects. Finally the simulator produces the result for optimum modelling of CNT for electronic device application.
international conference on computing electrical and electronic engineering | 2013
S. M. A. Motakabber; Muhammad Ibn Ibrahimy; A. H. M. Zahirul Alam
Ultra wideband (UWB) chipless RFID tag of microwave band is used to study the location of an object. Two microwave antennas for narrow bandwidth beam used for scanning purpose. The antennas are mounted on two digital stepper motor driven systems. The location of the tagged object is measured from the angular position of the antennas. A squire space of 25 m2 and 1 m2 resolution are used for the project. The simulation result showed that the location detection is almost error free. The accuracy of the position detection has a limitation and it depends on the resolution of the system. The system may be used in the warehouse/store for auto inventory and location finding purpose.
symposium/workshop on electronic design, test and applications | 2011
Muhammad Ibn Ibrahimy; Khalid A. Saeed Al-Khateeb; Muhammad A. Hasan; S. M. A. Motakabber
Developing and less developing countries (LDCs) are identified in risk of stillbirth due to insufficient emergency medical take-care supports. The regular check-up of the fetal electrocardiography (FECG) could be an earliest prevention of this occurrence. This paper presents a research work aim to implement a simple, customize and portable emergency medical care for the FECG monitoring system from remote location. After acquisitions of the abdominal wall fetal electrocardiography (AFECG) signal from the pregnant mother (patient), the local terminal then transfers this AFECG signal as data to the remote terminal at the expert physician for diagnosis purpose. At the remote terminal, the FECG signals are then extracted from the AFECG signals by our developed software. In this case, computer network establishes a bridge between the patient and a distant expert physician. The network program developed based on the client/server applications. The developed network program is capable to support both the AFECG data transfer and online chat session simultaneously. A specialist physician at the remote terminal can diagnose the FECG signal and provides instruction to the local terminal in case of emergency. A number of cases studied by this developed system and found approximately same result compared with a commercial system.
international conference on rfid | 2013
M. S. R. Bashri; Muhammad Ibn Ibrahimy; S. M. A. Motakabber
A planar wideband patch antenna for ultra-high frequency (UHF) radio frequency identification (RFID) tag for metallic applications is presented in this research work. Three different shape patches are inductively coupled to a triangle loop to excite three resonances close to each other to form wide impedance bandwidth for universal application UHF (860-960 MHz) RFID. The structure of the proposed antenna exhibits planar profile to provide ease of fabrication for cost reduction well suited for mass production. The simulation of the antenna was carried out using Finite Element Method (FEM) based software, Ansoft HFSS v13. The performance of the design was verified by the simulation and measurement results which show good agreement. The simulated and measured impedance bandwidth of 113 MHz and 117 MHz (return loss ≥ 6 dB) was achieved to cover the entire UHF RFID operating frequency band worldwide.
IOP Conference Series: Materials Science and Engineering | 2013
U T Tania; S. M. A. Motakabber; Muhammad Ibn Ibrahimy
Nowadays security and authentication are the major parts of our daily life. Iris is one of the most reliable organ or part of human body which can be used for identification and authentication purpose. To develop an iris authentication algorithm for personal identification, this paper examines two edge detection techniques for iris recognition system. Between the Sobel and the Canny edge detection techniques, the experimental result shows that the Cannys technique has better ability to detect points in a digital image where image gray level changes even at slow rate.
international conference on computer and communication engineering | 2016
Tawfikur Rahman; S. M. A. Motakabber; Muhammad Ibn Ibrahimy
The synchronous inverter is an electrical inverter device which is synchronizing inverter phase into the micro-grid phase at the same amplitude and frequency. A three phase phase synchronous inverter (PSI) is basically used in the high efficiency power supply systems. The inverter phase is depend on the controllers which are two level pulse width modulation (PWM) generator, phase lock loop (PLL) regulator, DC voltage regulator current regulator and Uref generator to get the reference input and output voltage and current for synchronizing the phase angle. An inverter using a three leg IGBT has been designed for microgrid systems and simulated by using MATLAB2014a. The input and output lowpass LC filters are used to synchronize the micro-grid phase. The controllers have generated PWM signal and a zero crossing sampling is used to precisely synchronize with microgrid line frequency. A balanced microgrid load of star configuration (00, 1200 and -1200 degree), and also the input DC voltage ± 250V are considered in this design. The overall conversion efficiency of the PSI is 97.62% and phase synchronization error for each phase is about 0.50, 1540 and 2650 degrees. The results show that the design has better performance and can be used efficiently in the micro-grid system.
international conference on computer and communication engineering | 2016
Tawfikur Rahman; S. M. A. Motakabber; Muhammad Ibn Ibrahimy
The inverter is an electrical switching control device that can be converted from one source to another source like as DC to AC or AC to DC. An efficient three leg IGBT inverter has been designed for microgrid systems which are simulated by MATLAB2014a /Simulink. The inverter switches are controlled by a pulse controller, which mainly generates the switching gate pulse. The switching pulse controller consists of two level pulse width modulation (PWM), phase lock loop (PLL), DC voltage and current regulator and Uref generator. The inverter gate pulse has designed using the input reference voltage and current, output reference signal and a reference phase angle. The pulse signal precisely synchronized with the microgrid line frequency of zero crossing sampling and reduces the total losses in the inverter which is almost 50W. Two lowpass LC filters have been used in this inverter that reduces the switching loss. The design of the three-phase inverter has better performance compared to single phase, the overall conversion efficiency of the inverter is 97.62%.
international conference on computer and communication engineering | 2016
Tawfikur Rahman; S. M. A. Motakabber; Muhammad Ibn Ibrahimy
The inverter is a power electronics device which changes DC voltage to AC voltage or vice versa. The synchronous phase inverter is used in the microgrid system to connect the renewable energy sources of minimum phase error. For a high-efficiency power transmission and distribution system, a three-phase inverter is used. The electronic switches of the inverter are controlled by a controller circuit which can be a two-level pulse width modulation (PWM), phase lock loop (PLL) controller, etc. A fixed reference DC voltage and current generators are used for a stable input-output voltage and current to reduce the higher harmonic distortions. An LC lowpass filter has been designed and simulated for the input and output of the system by using MATLAB2014a. The input filter is utilized to reduce the AC ripple component in the DC input supply, and the output filter is used to reduce the higher frequency harmonic distortion from the inverter output supply to maintain the IEEE standard THD