Pathumwan Institute of Technology
Bangkok, Thailand

Pathumwan Institute of Technology is a Thai public university located in Bangkok, Thailand.Established in 1932 as a technical school by a group of Thai Navy officers, the institute was upgraded to technical college in 1975. It eventually became a public university known as Pathumwan Institute of Technology in 1999.The institute has two academic units: the faculty of Engineering and the faculty of Education. Wikipedia.

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Maksuwan A.,Pathumwan Institute of Technology
Materials Science Forum | Year: 2017

In 1985, H.A. Janssen studied the structure of the forces inside a silo filled with granular materials, so-called Janssen’s Effect Method (J.E.M). This method is a unique property of confined granular materials. The pressure at the bottom saturated with an increasing filling height due to internal friction with side walls. In this research, we focus on the study of granular cohesionless materials such as sands and gravels, these forces are explained by adsorption and capillary phenomenon. Our main result shows that positive water pressures generate a mechanical effect with tendencies of removing the components of the porous medium corresponding to the mechanical buoyancy force (FB) that increases with increasing θ from calculated by Janssen's effect method. The topic in this research is once importance in study physical processes of the problem in the Geology Physics (i.e. the factor causing landslide). © 2017 Trans Tech Publications, Switzerland.

Chantngarm P.,Pathumwan Institute of Technology
Journal of Superconductivity and Novel Magnetism | Year: 2011

We investigate the spin-valley current in a strain-engineered graphene magnetic system, normal region (N)/strain region(S)/ferromagnetic region (F)/normal region (N) junction. Locally strained region S leads to valley-dependent current, and ferromagnetic region F leads to the spin-dependent current. We find that pure valley current can be created easily by applying the real-vector potential that is equal to the pseudo-vector potential caused by strains in the S-region. In this work, we focus on the spin current in each valley when exchange field is applied in the F-region, and find that the linear control of spin-valley polarization by gate potential is possible. It is also found that when the current is carried only by the carriers in one valley (pure valley current), pure spin-up current can be linearly altered to pure spin-down current by tuning the gate potential, in the case of very large-F-thickness junction. Our work is applicable for devising controllable spin-valley-current electronics circuits. © 2011 Springer Science+Business Media, LLC.

Mueanploy W.,Pathumwan Institute of Technology
Journal of Physics: Conference Series | Year: 2015

The objective of this research was to offer the way to improve engineering students in Physics topic of vector product. The sampling of this research was the engineering students at Pathumwan Institute of Technology during the first semester of academic year 2013. 1) Select 120 students by random sampling are asked to fill in a satisfaction questionnaire scale, to select size of three dimensions vector card in order to apply in the classroom. 2) Select 60 students by random sampling to do achievement test and take the test to be used in the classroom. The methods used in analysis of achievement test by the Kuder-Richardson Method (KR- 20). The results show that 12 items of achievement test are appropriate to be applied in the classroom. The achievement test gets Difficulty (P) = 0.40-0.67, Discrimination = 0.33-0.73 and Reliability (r) = 0.70.The experimental in the classroom. 3) Select 60 students by random sampling divide into two groups; group one (the controlled group) with 30 students was chosen to study in the vector product lesson by the regular teaching method. Group two (the experimental group) with 30 students was chosen to learn the vector product lesson with three dimensions vector card. 4) Analyzed data between the controlled group and the experimental group, the result showed that experimental group got higher achievement test than the controlled group significant at .01 level. © Published under licence by IOP Publishing Ltd.

Maksuwan A.,Pathumwan Institute of Technology
Advanced Materials Research | Year: 2014

We rigorously investigate the refractive index by using the technique of the Green's function. The propagator model of the polarization-free photon is created in quantum field theory viewpoint. The Green's function is solved in detail with appropriate boundary originating an idea of amplitudes to propagate from place to place found in Richard Feynman's QED: The Strange Theory of Light and Matter (Princeton University Press, Princeton, New Jersey, 1985). The polarizationfree photon is emitted from external sources or emitter in one medium and then propagates into another medium with the key idea: expression for amplitudes of scattering is a shrink and a tune by a certain amount, and is the same everywhere in one medium is given by determining the various contributions to probability amplitude coming from an integration over an arbitrary circular region of radius a. The purpose of this communication to establish the amplitude for the transmission of propagates by disregard about the material property. This amount is different for different materials, which corresponds to the "slowing" of the light is extra turning caused by the atoms in one medium scattering the light. The degree to which there is extra turning of the light goes through a given material is called its "index of refraction" for geometrical optics in classical physics. © (2014) Trans Tech Publications, Switzerland.

Mueanploy W.,Pathumwan Institute of Technology
Journal of Physics: Conference Series | Year: 2016

This study is the case study of Physic II Course for students of Pathumwan Institute of Technology. The purpose of this study is: 1) to develop cooperative learning method of peer assisted learning (PAL), 2) to compare the learning achievement before and after studied magnetic field lesson by cooperative learning method of peer assisted learning. The population was engineering students of Pathumwan Institute of Technology (PIT's students) who registered Physic II Course during year 2014. The sample used in this study was selected from the 72 students who passed in Physic I Course. The control groups learning magnetic fields by Traditional Method (TM) and experimental groups learning magnetic field by method of peers assisted learning. The students do pretest before the lesson and do post-test after the lesson by 20 items achievement tests of magnetic field. The post-test higher than pretest achievement significantly at 0.01 level.

Maksuwan A.,Pathumwan Institute of Technology
Key Engineering Materials | Year: 2016

In general explanation for propagation of electromagnetic wave at a plane between two media of different dielectric properties. The description of this phenomenon be based on the actual physical process of the well know interpretation of the classical rays with the polarization vectors. In this research, we investigate this situation by using the knowledge of the amplitude of emission and absorption of massless spin-1 particle (photon) excitation by the emitter and detector, respectively. By using time evolution process based on vacuum-to-vacuum transition amplitude in quantum (field) theory QED formalism. This process shows that the propagation of photon excitation by the external sources is given with an explanation of the amplitude of propagation between different spacetime points from an emitter to a detector, which exclude with the Feynman propagator. The purpose of this research is developing a formalism based on the actual physical process of photons propagate from an emitter to a detector. It shows the consistency to the actual physical process of interpretation of the polarization vectors in the classical rays. © 2016 Trans Tech Publications, Switzerland.

Wutthithanyawat C.,Pathumwan Institute of Technology | Srisiriwat N.,Pathumwan Institute of Technology
Applied Mechanics and Materials | Year: 2013

As increasing hydrogen demand for fuel cell application is expected in the near future, the efficient production of hydrogen is vital enabling technology for commercialization of fuel cell for residences and automobiles. Among different technologies of hydrogen production, autothermal reforming is considered to be thermally self-sustaining that the external heat source is not required. In this work, a steady state modeling of autothermal reforming of ethanol for hydrogen production has been performed. Because the operating condition at adiabatic temperature is designed for autothermal reformer, the estimated function of adiabatic temperature as function of steam-tocarbon (S:C) and air-to-carbon (A:C) molar ratios can be determined. At autothermal condition, the effect of S:C and A:C ratios on the product distributions of hydrogen rich stream is thermodynamically investigated. At fixed reactor pressure of 1 bar and preheat temperature of 200 °C, the favorable operating condition for the autothermal reforming of ethanol is found to be a S:C ratio of 2.0 and an A:C ratio of 1.75 at adiabatic temperature of 639 °C. © (2013) Trans Tech Publications, Switzerland.

Srisiriwat N.,Pathumwan Institute of Technology | Wutthithanyawat C.,Pathumwan Institute of Technology
Applied Mechanics and Materials | Year: 2013

This work presents the autothermal reforming (ATR), or called oxidative steam reforming (OSR), of ethanol for hydrogen production. A thermodynamic analysis of product distribution for ATR from ethanol has been performed by using the method of Gibbs free energy minimization. The effect of steam-to-carbon (S:C) and air-to-carbon (A:C) molar ratios under adiabatic temperature of ATR reactor on chemical equilibrium composition of hydrogen rich stream is investigated. An increase of S:C ratio increases an efficiency of hydrogen production while carbon monoxide formation decreases but, however, more energy consumption for preheating reactants is also needed. An increase of A:C ratio in the range between 0 and 1.75 causes an increase of hydrogen yield but at greater A:C ratio, a decrease of hydrogen production and more water formation can be found. The results of the thermodynamic equilibrium show that the predicted hydrogen composition in the reaction of fuel-water-air system at constant temperature is higher than that obtained from experiment in both the absence and presence of catalysts in the OSR reaction when the temperature is fixed at 700 °C. The predicted carbon monoxide is lower than that obtained from the results of non-catalytic reaction but higher than that attained from the presence of catalyst in process. © (2013) Trans Tech Publications, Switzerland.

Wutthithanyawat C.,Pathumwan Institute of Technology | Srisiriwat N.,Pathumwan Institute of Technology
Applied Mechanics and Materials | Year: 2014

Autothermal reforming (ATR), which is the combination of endothermic steam reforming and exothermic partial oxidation, is an attractive process to produce hydrogen using for transportation fuel cell because of its moderate size. ATR is considered to be thermally self-sustaining that the external heat source is not required. In order to keep the adiabatic temperature of ATR reactor, the process control strategy needs in understanding the dynamic characteristics of the ATR system. Thus, the modeling and simulation of ATR process for hydrogen production fueled by ethanol is carried out in this work. The open loop responses of the feed and ATR temperatures are simulated by the dynamic models of ATR system. The simulation results showed the predominantly influence of the electrical power of preheater on the feed and ATR temperatures while the air flowrate has an inverse effect on the feed temperature and a direct effect on the ATR temperature. As a result, the match of control loop is very sensible for an effective control strategy in the development of control system design for maintaining the adiabatic temperature of ATR reactor for sustaining the effectiveness of hydrogen production. © (2014) Trans Tech Publications, Switzerland.

Soodchomshom B.,Pathumwan Institute of Technology
Physica B: Condensed Matter | Year: 2010

Spin-dependent quantum transport in a NM1/FM/NM2 planar junction is studied, where FM and NM1,2 are a ferromagnet and two different normal metals, respectively. In this work, the oscillatory conductance depending on thickness of FM is studied by focusing on the scattering of the Schrüdinger electrons at the interfaces. The conductance modulation due to the energy of the mobile electrons split in FM layer occurs when FM and NM2 have both the Fermi energies much higher than that of the Fermi energy EF in NM1 and the exchange energy h1 in FM is much smaller than its Fermi energy EF1, h1 / EF 1 ≪ 1. Comparing with the conductance modulation due to massless Dirac electron, recently investigated by Soodchomshom et al. [Phys. Lett. A 372 (2008) 5054], electrons in a conventional system, governed by Schrüdinger equation, always carry the modulated conductance with decaying amplitude when thickness of FM increases. This Schrüdinger conductance modulation is quite different from the massless Dirac modulated conductance with holding constant amplitude. © 2009 Elsevier B.V. All rights reserved.

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