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Nanostructured multilayer thin films of multiwalled carbon nanotubes/gold nanoparticles/glutathione for the electrochemical detection of dopamine

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International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1204-1214页

作者： Ekarat Detsri sirilak Rujipornsakul Tanapong Treetasayoot Pawarit siriwattanamethanon Department of Chemistry Faculty of Science King Mongkut's Institute of Technology Ladkrabang Advanced Materials Research Unit Faculty of Science King Mongkut's Institute of Technology Ladkrabang

In the present study, multiwalled carbon nanotubes（MWCNTs）, gold nanoparticles（AuN Ps）, and glutathione（GsH） were used to fabricate multilayer nanoscale thin films. The composite thin films were fabricated by layer-by-layer technique as the films were constructed by the alternate deposition of cationic and anionic polyelectrolytes. The MWCNTs were modified via a noncovalent surface modification method using poly（diallydimethylammonium chloride） to form a cationic polyelectrolyte. An anionic polyelectrolyte was prepared by the chemical reduction of HAuCl_4 using sodium citrate as both the stabilizing and reducing agent to form anionic AuN Ps. GsH was used as an electrocatalyst toward the electro-oxidation of dopamine. The constructed composite electrode exhibits excellent electrocatalytic activity toward dopamine with a short response time and a wide linear range from 1 to 100 mmol/L. The limits of detection and quantitation of dopamine are（0.316 ± 0.081） mmol/L and（1.054 ± 0.081） mmol/L, respectively. The method is satisfactorily applied for the determination of dopamine in plasma and urine samples to obtain the recovery in the range from 97.90% to 105.00%.

关键词： multiwalled carbon nanotubes gold nanoparticles glutathione dopamine

Effect of bending temperatures on the microstructure and springback of a TRIP steel sheet

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Defence technology（防务技术） 2020年第5期16卷 980-987页

作者： Natthasak Pornputsiri Kannachai Kanlayasiri Industrial engineering Faculty of EngineeringKing Mongkut’s Institute of Technology LadkrabangBangkok10520Thailand

Transformation-induced plasticity(TRIP)steel possesses high strength and formability,enabling the use of a thinner gauge material and allowing for the fabrication of complex *** this research,we measured the effect of bending temperatures on the microstructure and air-bending springback angle of TRIP steel at temperatures from 25 to 600***-time in situ X-ray diffraction and scanning electron microscopy were used for pre-and postbending *** the prebending temperature increased from 25C to 600C,the retained austenite(RA)volume fraction decreased,and the RA transformed to bainite at temperatures above 400*** springback angle was positively correlated with the prebending RA volume fraction,with the smallest springback angle achieved at 400***,the springback angle was positively correlated with the bending angle,because the RA transformation ratio contributed to increased strain *** microstructure analysis revealed that the RA became elongated in the tension direction as the bending temperatures increased.

关键词： TRIP steel In situ X-ray diffraction Phase transformation Bending temperature springback Air-bending test

Analysis of environmental impacts of drone delivery on an online shopping system

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Advances in Climate Change Research 2018年第3期9卷 201-207页

作者： Jarotwan KOIWANIT faculty of engineering King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand

In rural areas, drones are designed to replace road deliveries so as to overcome infrastructure challenges; though drones notably consume lessfuel and consequently have a smaller impact on the environment, their full life cycle assessment should still be evaluated to comprehensivelyunderstand their environmental impact. This study presents a life cycle assessment study on drone delivery in Thailand using CML2001, the lifecycle impact assessment （LCIA） method, to convert life cycle inventory data into environmental impacts. The observed results show that anonline shopping system using drone delivery is one of the most environmentally friendly transportation options throughout a wide range ofscenarios. However, the parts production contributed to significant impacts on environmental issues while the drone operation showed the leastimpact to all impact categories. The dominant contributors to global warming, abiotic depletion （ADP elements and fossil）, acidification air,eutrophication, ozone layer depletion, and photochemical ozone creation impact categories were the coal mining and electricity generatingstation operation. However, the carbon fibers and the battery, are the main contributors to other impact categories, which include the humantoxicity, freshwater aquatic ecotoxicity, marine aquatic ecotoxicity, and terrestric ecotoxicity.

关键词： LCA GHG emissions CML2001 Online shopping Drone delivery

Multi-Reconfigurable Band-Notched Coplanar Waveguide-Fed slot Antenna

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Journal of Electronic science and technology 2018年第1期16卷 74-78页

作者： M.Lertwatechakul C.Benjangkaprasert faculty of engineering King Mongkut’s Institute of Technology LadkrabangBangkok 10520

This paper proposes an antenna design concept to achieve a multi-reconfigurable band-notch antenna by using a set of microswitches. The proposed idea was proved by the design of the coplanar waveguide(CPW)-fed slot antenna. The sample design gives a wideband antenna the impedance bandwidth of which covers the frequency ranged from 1.9 GHz to 6.55 *** antenna could be configured to work either in single-band mode or in one of the defined dual-band modes.

关键词： Antenna band-notched coplanar waveguide(CPW) reconfigurable

Novel colorimetric sensor for mercury (Ⅱ) based on layer-by-layer assembly of unmodified silver triangular nanoplates

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Chinese Chemical Letters 2016年第10期27卷 1635-1640页

作者： Ekarat Detsri Department of Chemistry Faculty of ScienceKing Mongkut's Institute of Technology Ladkrabang Advanced Materials Research Unit Faculty of ScienceKing Mongkut's Institute of Technology Ladkrabang

A simple layer-by-layer deposition technique was used to fabricate the multilayer thin films of unmodified silver triangular nanoplates （AgTNPs）. The multilayer of AgTNPs thin films were fabricated by alternate deposition of each anionic sodium citrate stabilized AgTNPs and cationic poly（diallyldimethylammonium chloride）. All prepared AgTNPs multilayer thin films were exhibited a strong plasmon band at the wavelength of 667 rim, which confirmed the formation of AgTNPs onto the substrate. The characteristics of the multilayer thin films were investigated using contact angle measurement, UV-visible spectroscopy, X-ray diffraction analysis （XRD）, atomic force microscope （AFM） and field emission scanning electron microscope （FEsEM）. As these films are to be used as a mercury （Ⅱ） colorimetric sensor, the changes in optical properties of the films were evaluated for various mercury （Ⅱ） concentrations. AgTNPs assembled into thin films showed a strong color shift from blue to mauve and colorless when exposed to mercury （Ⅱ）. The constructed multilayer thin films exhibited excellent color changes of mercury （Ⅱ） with a linear range between 0.5 and 20 ppm. The limit of detection （LOD） and limit of quantitation （LOQ） were 0.45 ± 0.002 and 1.52 - 0.002 ppm, respectively. The recovery values of AgTNPs multilayer thin films are satisfactory in the range of 100.1%-106.4% when applied to determining mercury （Ⅱ） in water samt）les.

关键词： silver triangular nanoplatesLayer-by-LayerMercury (II)Colorimetric sensor

Turbulent heat transfer and pressure loss in a square channel with discrete broken V-rib turbulators

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Journal of Hydrodynamics 2016年第2期28卷 275-283页

作者： Promthaisong PITAK Eiamsa-ard PETPICEs Jedsadaratanachai WITHADA Eiamsa-ard sMITH faculty of engineering Mahanakorn University of Technology faculty of Industrial technology Phetchaburi Rajabhat University faculty of engineering King Mongkut's Institute of Technology Ladkrabang

Turbulent periodic flow, heat transfer, friction loss and thermal enhancement characteristics in a three-dimensional horizo- ntal square channel with broken V-ribs （B-VR） are numerically investigated. The computations are based on the finite volume method, and the sIMPLE algorithm with QUICK scheme is implemented. The B-VR were installed on both sides of a plate which was diagonally placed in a square channel to produce longitudinal vortex flows through the tested section. Effects of different open comer ratios （ d/H = 0, 0.01, 0.02, 0.03, 0.04 and 0.05） on heat transfer and pressure loss in the channel and the results of the B-VR are studied. The pitch ratio （PR = p/H） and blockage ratio （BR = p/H） of B-VRs were fixed at 1.0 and 0.15, respectively. As compared with the channel without V-rib, the one with B-VRs possessed considerably higher heat transfer and friction loss. It is observed that apart from the rise of Reynolds number, the reduction of the open comer ratios leads to an increase in the Nusselt number and friction factor due to the weaker turbulence and lower resistance to the flow. According to the computational results for B-VRs, the optimum thermal enhancement is fotmd at d/H = 0.

关键词： channel periodic flow heat transfer friction loss broken V-ribs

Permeability and setting time of bio-mediated soil under various medium concentrations

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Journal of Rock Mechanics and Geotechnical engineering 2021年第2期13卷 401-409页

作者： Treesukon Treebupachatsakul Viroon Kamchoom Department of Biomedical engineering Faculty of EngineeringKing Mongkut’s Institute of Technology LadkrabangLadkrabangBangkok10520Thailand Excellent Centre for Green and sustainable Infrastructure Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s Institute of Technology LadkrabangLadkrabangBangkok10520Thailand

The bio-clogging using bacteria can be an eco-friendly and sustainable alternative to conventional grouting methods for seepage ***,it remains unclear to date how the dilute concentration of bacterium and medium during field installation can affect the setting time of bacterium and its correlation with permeability *** this study,the setting time of bacterium and its effectiveness in permeability reduction were addressed through experimental and theoretical investigations.A series of sand column was cultivated using different concentrations of Leuconostoc mesenteroides and culture *** distribution and composition of the bacterial product(***)were observed by refractometer,scanning electron microscope(sEM),and energy dispersive X-ray spectroscopy(EDs).soil permeability was recorded using a constant head *** results revealed that bacterium was effective to produce dextran at the setting time of about 5 d after *** dextran can reduce the permeability of bio-mediated soil by two orders of magnitude,even without culture medium *** general,the dextran production decreased proportionally with increase of bacterium and medium ***,at 50%bacterium and medium concentration by weight,it still has a significant influence on permeability reduction with similar setting time,compared to 100%concentration.

关键词： Bio-clogging Bio-mediated soil Medium concentration Leuconostoc mesenteroides Permeability setting time

Laminar Periodic Flow and Heat Transfer in a Rectangular Channel with Tri-angular Wavy Baffles

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Journal of Thermal science 2012年第3期21卷 250-261页

作者： smith Eiamsa-ard Pongjet Promvonge Department of Mechanical engineering Faculty of EngineeringMahanakorn University of Technology Department of Mechanical engineering Faculty of EngineeringKing Mongkut's Institute of Technology Ladkrabang

This paper presents a numerical analysis of laminar periodic flow and heat transfer in a rectangular constant temperature-surfaced channel with triangular wavy baffles (TWBs).The TWBs were mounted on the opposite walls of the rectangular channel with inline *** TWBs are placed on the upper and lower walls with attack angle 45?.The numerical is performed with three dif-ferent baffle height ratios (BR=b/H=0.05 0.3) at constant pitch ratio (PR) of 1.0 for the range 100 ≤ Re ≤ *** computational results are shown in the topology of flow and heat *** is found that the heat transfer in the channel with the TWB is more effective than that without *** in-crease in the blockage ratio,BR leads to a considerable increase in the Nusselt number and friction *** results indicate that at low BR,a fluid flow is significantly disturbed resulting in inefficient heat *** BR increases,both heat transfer rate in terms of Nusselt number and pressure drop in terms of friction factor *** the range examined,the maximum Nu/Nu0 of 7.3 and f/f0 of 126 are both found with the use of the baffles with BR=0.30 at Re=*** addition,the flow structure and temperature field in the channel with TWBs are also reported.

关键词： Heat transfer Laminar periodic flow Channel flow Triangular wavy baffle

Applying singular value decomposition technique for quantifying the insects in commercial Thai Hommali Rice from NIR spectrum

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Journal of Innovative Optical Health sciences 2017年第2期10卷 93-104页

作者： Puttinun Jarruwat Prasan Choomjaihan Department of Agricultural engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang LadkrabangBangkokThailand10520

Insect infestation in rice stock is a significant issue in rice exporting business,resulting in the loss of product quality,nutrient as well as the economic ***,detecting the insect cont amination with the traditional sorting techniques were destructive,inaccurate,time consuming and unable to detect the internal insect *** study used near infrared(NIR)spectroscopy for obtaining the absorbent spectra from the insect cont amination in two kinds of rice samples,Milled Hommali rice(MHR)and Brown Hommali rice(BHR).The mathematical methods of partial least squares(PLss)regression and singular value de-composition(sVD)were employed to construct the predicting *** statistical analysis results,R,RMsEP,RPD and bias,concluded that the predictive models from PLs for MHR and BHR were 0.95 and 0.90,0.014 and 0.019,4.79 and 3.11,as well as-0.007 and-0.008,respectively;while the statistical analysis results from sVD for MHR and BHR were 0.97 and 0.96,0.012 and 0.013,5.71 and 5.39,as well as-0.003 and 0.002,*** showed that sVD technique performed better than PLs technique which shows that using the advantage of sVD technique required less amounts of wave numbers for predicting and was possible to construct the low cost handheld equipment for detecting the insects in rice samples.

关键词： Insect rice NIR sVD