
Porramain PorjaiRajamangala University of Technology · Division of Physics
Porramain Porjai
Ph.D. Physics
About
24
Publications
2,500
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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
Education
June 2014 - December 2016
Publications
Publications (24)
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...