Papers by Phansak Iamraksa
EThOS - Electronic Theses Online ServiceGBUnited Kingdo
The 31st International Ocean and Polar Engineering Conference, Jun 20, 2021
The force sensitive resistor is applied to measure the water wave physical parameters. The in-hou... more The force sensitive resistor is applied to measure the water wave physical parameters. The in-housed wave sensitive actuator was designed and manufactured by 3D printer. By sensing the wave pressure force acting upon the actuator, the voltage signal across the resistor is varied, depending on the water elevations. The voltage signal is amplified and fed to the data logger, and the voltage-time data are obtained as text file and ready for interpreting. The significant wave heights and periods are analyzed manually. These data are validated with the results acquired from video recording photos.
Energy Procedia, 2015
This research was intended to use electric motor in order to replace fossil fuel consumption engi... more This research was intended to use electric motor in order to replace fossil fuel consumption engines. By focusing on the development of electrical propulsion system (EPS), one had to find the motor which was compatible with 4 m length boat model. The target of this development was attempting to design the electric drive which could reach up to 5 knots. The electricity of EPS was supplied by 4 batteries providing 24 volts of direct current, while thrust of the vessel was delivered by 3-phases 2.2 kW squirrel cage induction motor. The in-house designed inverter, converting from direct current system to 3-phase system, was coupled between batteries. The onsite experiment was carried out in the open-sea at Sriracha Bay, west of the campus. The results indicated that the maximum speed of the system could reach 5 knots within 1 kilometre distance.
2015 Asian Conference on Defence Technology (ACDT), 2015
The infrared docking aid system was developed and investigated to help small craft such as fishin... more The infrared docking aid system was developed and investigated to help small craft such as fishing or recreation boats when they sailed close to the pier or port. The experiment was conducted in water tank with the scaled model boat. The system consisted of the infrared beacon locating at the port and the infrared detection array installed in the modeled boat. The results suggested that the system was capable to navigate the boat to dock in the correct position as the boat came in small angle from beacon.
The influence of p-dichlorobenzene (PDCB) as crystallizable solvent on the morphology and perform... more The influence of p-dichlorobenzene (PDCB) as crystallizable solvent on the morphology and performance of bulk heterojunction (BHJ) organic solar cells was studied based on a 1:2 (w/w) blend of benzothiadiazole/thiophene-based copolymers (PFTBzTT) to [6,6]-phenyl-C61 butyric acid methyl ester (PCBM). The active layers were deposited by spin-coating from solutions using chloroform, with different concentrations of PDCB. The addition of PDCB into the polymer solution could improve the performance of BHJ solar cells. The maximum power conversion efficiency (PCE) of 0.75 % can be obtained for a cell with PDCB concentration of 28 mg/ml after annealing at 165 °C for 20 min, which is about seven times improvement over devices obtained under the same conditions but without the inclusion of PDCB. The AFM images of the thin films with PDCB suggests that the higher level of polymer self-organization results in more aggregation of PCBM and a larger extent of phase separation than those of the fi...
Advanced Materials Research, 2010
Titanium oxide TiOx material is used as electron transporter in organic photovoltaic cells (OPV).... more Titanium oxide TiOx material is used as electron transporter in organic photovoltaic cells (OPV). The layer was prepared between P3HT:PCBM as the active layer and the and aluminum electrode by spin coating technique. The synthesis and characterization of TiOx is described. Using Raman spectroscopy technique TiOx crystals show anatase structure. Varied concentrations of TiOx and isopropanol solvent were performed. The most optimized device efficiencies up to 2,0% was achieved at a 1:20 ratio, which indicated more than 50% efficiency enhancement comparing with the device without TiOx layer. The major improvement of the cell was originated from photocurrent enhancement.
Solar Energy Materials and Solar Cells, 2010
In this work, we present the effect of 1,3,5-trichlorobenzene (TCB) on the morphology and perform... more In this work, we present the effect of 1,3,5-trichlorobenzene (TCB) on the morphology and performance of a 1:1(w/w) rr-P3HT:PCBM polymer/fullerene bulk-heterojunction solar cell. The UV-vis spectra of the rr-P3HT:PCBM polymer/fullerene formed from a blend with various TCB concentrations (0-28 mg/ ml) indicate an enhanced absorption within the 500-600 nm wavelength range when formed in the presence of the TCB. By increasing the concentration of TCB in the blend, the resultant spun-cast film morphology was improved due to grain size reduction, and the polymer film quality can be further improved via an annealing process. Moreover, the device efficiency is also improved due to a good quality thin film nanostructure. With the optimized TCB quantity and annealing temperature, the power conversion efficiency (PCE) achieved with the solar cell was up to 20% better than that attained by a similar device without the presence of TCB.
Journal of Materials Science: Materials in Electronics, 2007
Near-infrared photodetectors have been fabricated using standard CMOS processes in conjunction wi... more Near-infrared photodetectors have been fabricated using standard CMOS processes in conjunction with the multilayer growth of Si/SiGe 0.06 using low-pressure chemical vapor deposition (LPCVD). Cross-section scanning electron microscopy (SEM) indicates the existence of quantum dot like corrugations in devices with particularly thick SiGe 0.06 quantum wells. With an accumulation of germanium atoms at the crest of such features and commensurate high germanium concentration we see a considerable enhancement of the long wavelength detection sensitivity of photodetectors in the range 1100-1300 nm. By fitting experimental data the minimum energy gap of the structure is found to be 0.88 eV corresponding to a germanium concentration of around 15%.
American Journal of Environmental Sciences, 2011
was routinely monitor the annual concentrations and analysis the emission sources of the air poll... more was routinely monitor the annual concentrations and analysis the emission sources of the air pollutants in the area since 2007. The level of concentration CO, SO 2 , NO x and O 3 were measured. PM 10 concentration was measured by mean of TOEM method. The PM 10 and TSP (manifold) filters were collected for the measurement of heavy metals adsorbed in the particulate by ICP-AES techniques. Scanning Electron Microscopic (SEM) and Energy Dispersive Spectrometric (EDS) techniques were used to identify the morphologies and elemental compositions of particulate matters from the PM 10 and TSP filters. Approach: The annual concentrations of all pollutants were almost real-time reported from July 2007-2008. The O 3 concentrations are higher than the standard level (100 ppb)
Journal of Marine Science and Application, 2020
This study aims to investigate the nonlinear added mass moment of inertia and damping moment char... more This study aims to investigate the nonlinear added mass moment of inertia and damping moment characteristics of largeamplitude ship roll motion based on transient motion data through the nonparametric system identification method. An inverse problem was formulated to solve the first-kind Volterra-type integral equation using sets of motion signal data. However, this numerical approach leads to solution instability due to noisy data. Regularization is a technique that can overcome the lack of stability; hence, Landweber's regularization method was employed in this study. The L-curve criterion was used to select regularization parameters (number of iterations) that correspond to the accuracy of the inverse solution. The solution of this method is a discrete moment, which is the summation of nonlinear restoring, nonlinear damping, and nonlinear mass moment of inertia. A zero-crossing detection technique is used in the nonparametric system identification method on a pair of measured data of the angular velocity and angular acceleration of a ship, and the detections are matched with the inverse solution at the same discrete times. The procedure was demonstrated through a numerical model of a full nonlinear free-roll motion system in still water to examine and prove its accuracy. Results show that the method effectively and efficiently identified the functional form of the nonlinear added moment of inertia and damping moment.
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Papers by Phansak Iamraksa