Porramain Porjai

Porramain Porjai
Rajamangala University of Technology · Division of Physics

Ph.D. Physics

About

24
Publications
2,500
Reads
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136
Citations
Introduction
Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, 39, Rangsit-Nakhonnayok Road, Thanyaburi, Pathum Thani, 12110, Thailand
Skills and Expertise
Additional affiliations
May 2017 - present
Rajamangala University of Technology
Position
  • Professor (Assistant)
Education
June 2014 - December 2016
Kasetsart University
Field of study
  • Excitable media

Publications

Publications (24)
Article
This study aimed to investigate the effects of air-cold plasma jet processing on the quality of mangosteen juice using an experimental design that varied the duty cycle of the power source (30%–70%), air flow rate (1–5 L/min), and treatment time (2–10 min). Changes in pH, color, ascorbic acid (AA), anthocyanin, flavonoid, phenolic content, enzyme a...
Article
Full-text available
The effects of low-cost Thai leucoxene mineral (LM) at different concentrations (10, 20, 30, 40, 50, and 60 mg/L) on the growth and antibacterial properties of Chrysanthemum indium L. cuttings under in vitro were evaluated. The primary chemical composition of LM was approximately 86% titanium dioxide (TiO2), as determined by dispersive X-ray spectr...
Article
Full-text available
BACKGROUND Hot‐air drying is a popular method for preserving the production of jackfruit, but heat treatment damages its nutritional qualities. Cold plasma is one of the pretreatment methods used to preserve quality attributes of fruits before drying. In the present work, we studied the effect of dielectric barrier discharge (DBD) plasma on the dry...
Article
Full-text available
Bioceramic materials have a wide range of applications in the biomedical field, such as in the repair of bone defects and dental surgery. Silicate-based bioceramics have attracted biomedical researchers' interest due to their bioactivity and biodegradability. In this study, extended the scope of ZAS utilization in bone tissue engineering by introdu...
Article
Full-text available
The degradation of methylene blue (MB) using air atmospheric pressure plasma jet (air APPJ) in contact with liquid was proposed. In this study, an AC-driven air APPJ using three discharge duty cycles (30%, 50%, and 80%) of a neon transformer was investigated. In each discharge duty cycle, the ignition and extinguishment phases were characterized. T...
Article
Full-text available
This article investigated the effects of an air atmospheric pressure plasma jet (APPJ) with different treatment times (30 to 120 s) on changes in fruiting body production and biochemical phytochemicals from white Cordyceps militaris (white C. militaris). A low-cost neon transformer was applied to generate the APPJ. An optical emission spectrometer...
Article
Full-text available
The impact of cold plasma jet (CPJ) on fruiting body production and bioactive phytochemicals in white Cordyceps militaris blended with Cordyceps militaris (blended C. militaris) cultured on solid media was evaluated. CPJ was driven by a 12 kV neon transformer with a duty cycle of 50% and a fixed flow rate of 5 L/min. Primarily, reactive oxygen and...
Article
Piezoelectric-assisted photocatalysis technology is one of the efficient ways to achieve enhancement in photocatalytic performance by facilitating the separation of photoinduced electron and holes via internal field initiated via piezoelectricity. Herein, bi-piezoelectric integrated effect was generated by the combination of piezoelectric semicondu...
Preprint
Full-text available
The impact of cold plasma jet (CPJ) on fruiting body production and bioactive phytochemicals in white Cordyceps militaris blended with Cordyceps militaris (blended C. militaris ) cultured on solid media was evaluated. CPJ was driven by a 12 kV neon transformer with a duty cycle of 50% and a fixed flow rate of 5 L/min. Primarily, reactive oxygen and...
Article
We study the correlation between the structural orientation and the chromatic characteristics in rubies by combining X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and density functional theory (DFT) calculations. The chemical compositions were investigated by X-ray fluorescence (XRF). XRD result shows the preferred orientation of Al...
Article
Ni-doped WO3 nanorod films were fabricated via a reactive magnetron cosputtering with a glancing angle deposition technique. The crystal structure and surface morphology were observed using grazing incident X-ray diffraction and field emission Scanning Electron Microscopy, respectively. The chemical compositions and oxidation state of each element...
Article
Full-text available
Propagation of orchid (Cymbidium tracyanum L. Castle) treated by using an air cold atmospheric pressure plasma jet at room temperature was investigated. The peak-to-peak voltage discharge and flow rate of the air atmospheric pressure plasma jet were set at 10.5 kV and 10 L/min, respectively. The constituent particles of the air cold atmospheric pre...
Article
We present an investigation of the dynamics of scroll waves that are partially pinned to inert cylindrical obstacles of varying lengths and diameters in three-dimensional Belousov-Zhabotinsky excitable media. Experiments are carried out in which a scroll wave is initiated with a special orientation to be partially pinned to the obstacle. Numerical...
Article
Full-text available
The emerging of pinning phenomena is described in many dynamical systems such as superconductivity and super fluidity. The dynamics of pinned scroll waves play an important role in the human health causing longer tachycardia. In this research, we present an investigation the properties parameter (i.e. wave period, wavelength and wave velocity) of p...
Chapter
Spiral waves are propagating self-organized structures commonly found in excitable media. Spiral waves of electrical excitation in cardiac systems connect to some arrhythmias, such as tachycardia and fibrillations, potentially leading to sudden cardiac death so that they should be eliminated. Such waves may drift and eventually annihilate at the bo...
Article
Full-text available
Pinning phenomena emerge in many dynamical systems. They are found to stabilize extreme conditions such as superconductivity and super fluidity. The dynamics of pinned spiral waves, whose tips trace the boundary of obstacles, also play an important role in the human health. In heart, such pinned waves cause longer tachycardia. In this article, we p...
Article
Unpinning of spiral waves from circular and rectangular obstacles of various sizes under electrical forcing was investigated in both the Belousov-Zhabotinsky reaction and numerical simulations with the Oregonator model. The used rectangles had a similar area size but different circumferences by adjusting width and height, while the area of the circ...
Article
We present an investigation of spiral waves pinned to circular and rectangular obstacles with different circumferences in both thin layers of the Belousov-Zhabotinsky reaction and numerical simulations with the Oregonator model. For circular objects, the area always increases with the circumference. In contrast, we varied the circumference of recta...
Article
Application of electrical forcing to release pinned spiral waves from unexcitable obstacles and to terminate the rotation of free spiral waves at the boundary of excitable media has been investigated in thin layers of the Belousov-Zhabotinsky (BZ) reaction, prepared with different initial concentrations of H_{2}SO_{4}. Increasing [H_{2}SO_{4}] rais...
Article
We present experimental observations on the electrically forced release of spiral waves pinned to unexcitable circular obstacles in the Belosov-Zhabotinsky reaction. When the applied electric current density reaches the necessary current density J_{unpin}, the spiral tip is detached and subsequently drifts away from the obstacle. J_{unpin} is found...
Article
A thin layer of the Belousov-Zhabotinsky reaction with pyrogallol (PG) supports meandering spiral waves with outward-petal trajectories. Increasing [PG] or lowering [H2SO4] leads to an enlargement of the outer diameter of the tip trajectory, as well as an increment of the number of petals. Far from the spiral tip, the wavelength and the wave period...
Article
Depending on the concentrations of reagents, the state of the Belousov–Zhabotinsky (BZ) reaction with pyrogallol (PG) is found to be stable reduced, excitable, oscillatory, or stable oxidized. For the oscillating solutions, the period decreases when either [H2SO4] or [NaBrO3] is increased, however, it increases with [PG]. For unstirred media, the e...

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