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    Numerical simulation of granular flow during filling and discharging of a silo
    (2010-12-10) W. Chuayjan; S. Pothiphan; B. Wiwatanapataphee; Y. H. Wu; Mahidol University; Curtin University
    In this study, we simulate the static and dynamic processes of granular flow during filling and discharging of a vertical-sided silo with conical hopper bottom. The granular material is an assembly of 7,500 soybeans. Based on the discrete element... method, the governing equations for the granular flow are solved by the centred finite difference scheme. The effects of inlet flow rate and bottom angles on pressure distribution on the hopper wall throughout the static process of material filling
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    Hydrogen sulfide removal using granular activated carbon biofiltration inoculated with Alcaligenes faecalis T307 isolated from concentrated latex wastewater
    (2010-08-01) Cheerawit Rattanapan; Duangporn Kantachote; Rong Yan; Piyarat Boonsawang; Mahidol University; Prince of Songkla University; Nanyang Technological University
    A novel biofiltration of pure culture was developed for H2S removal from synthetic biogas using Alcaligenes faecalis T307 immobilized on granular activated carbon (GAC) as packing materials. The effect of operating parameters, including inlet H2S
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    The electric field distribution of a hybrid rectangular and circular waveguide resonator for use in granular material dielectric measurements
    (2015-01-01) Navapadol Kittiamornkul; Kamon Jirasereeamornkul; Supaporn Kiattisin; Kosin Chamnongthai; Kohji Higuchi; King Mongkuts University of Technology Thonburi; Mahidol University; University of Electro-Communications
    © 2015 The Institute of Electrical Engineers of Japan. This paper represents a design for a hybrid rectangular and circular waveguide resonator. The resonator is designed specifically for the purpose of granular dielectric measurements, which
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    Two-phase flow of air and soybeans during a silo discharge process
    (2012-12-01) W. Chuayjan; W. Jumpen; P. Boonkrong; B. Wiwatanapataphee; Thaksin University; PERDO; Mahidol University
    The paper aims to present mathematical model and numerical simulation of a granular material flow during a silo discharge process. The material flow in the silo is a form of two-phase flow consisting of particulates and an interstitial fluid... and 0.12 m are chosen for this investigation. The results show that the mathematical model can capture the granular material flow in the silo. The bottom design has significant effect on the velocity, pressure and shear rate in the granular material
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    Numerical simulation of granular mixing in static mixers with different geometries
    (2019-12-01) Noraphon Bunkluarb; Wannika Sawangtong; Nathnarong Khajohnsaksumeth; Benchawan Wiwatanapataphee; Curtin University; Mahidol University; Commission on Higher Education
    © 2019, The Author(s). A static mixer is a fidelity engineered device for the continuous mixing of fluid/solid materials. To meet the requirements for mixing purpose, a proper design of the static mixer is important. In this study, we proposed
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    Preparation and characterization of enzymatically-treated granular cassava starch and poly(butylene adipate-co-terephthalate) blends
    (2012-01-01) Kamol Maikrang; Klanarong Sriroth; Kunruedee Sangseethong; Amnat Jarerat; Mahidol University; Kasetsart University
    Raw cassava starch was treated with α-amylase and amyloglucosidase in aqueous solution under annealing condition to obtain starch granules with rough and porous surfaces. Many different pits and pores formed by the activity of the enzymes on the surface granules and were observed by scanning electron microscopy (SEM). The obtained starch granules with rough surfaces were mechanically blended with poly(butylenes adipate-co-terephthalate)(PBAT) at different ratios by using a single screw extruder. The results showed that the samples comprised of enzymatically treated starch blends had higher elongation than those comprised of untreated starch blends. At 10% starch content, the treated starch/PBAT blend had about 37.55% more elongation than the untreated starch/PBAT blend. This resulted in the improved compatibility of the starch granules and PBAT matrix in the blends as confirmed by SEM. © (2012) Trans Tech Publications, Switzerland.
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    Diagnostic value of IgM deposition at the dermo-epidermal junction
    (1998-03-01) Kanokvalai Kulthanan; Sumruay Pinkaew; Puan Suthipinittharm; Mahidol University
    Background Granular immunoglobulin M (IgM) deposits at the dermo-epidermal junction (DEJ) are common in lupus erythematosus (LE); however, weak, interrupted, linear and granular patterns of IgM at the DEJ have been reported in sun-exposed skin... in normal adults and in a heterogeneous group of diseases. Materials and methods We analyzed 200 patients with positive IgM direct tissue immunofluorescence deposition at the DEJ, alone or in combination with other immunoreactants, in order to determine
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    Modification of tapioca starch by non-chemical route using jet atmospheric argon plasma
    (2014-02-15) Rungtiwa Wongsagonsup; Panakamol Deeyai; Weerawut Chaiwat; Sawanee Horrungsiwat; Kesini Leejariensuk; Manop Suphantharika; Asira Fuongfuchat; Somsak Dangtip; Mahidol University; Thailand National Science and Technology Development Agency; South Carolina Commission on Higher Education
    Non-chemical modification of tapioca starch was investigated using jet atmospheric argon plasma treatment. Two forms of starch slurry, i.e. granular starch (G) and cooked starch (C), were jet-treated by argon plasma generated by supplying input
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    ULTRASTRUCTURE OF CHORDOMA: A Case Report
    (1985-01-01) Vorachai SIRIKULCHAYANONTA; Siriporn SRIURAIRATNA; Mahidol University
    . The mitochondria showed irregularities in sizes and shapes but did not attenuate as much as previously reported. The vacuoles that were observed by light microscopy in physaliferous cells were both extra‐cellular and intra‐cellular and contained finely granular... material of acid mucopolysaccharides probably of chondroitin type. The presence of both subplasmalemmal linear densities (SLD) and pinocytic vesicles was consistent with the histogenetic conviction that the tumor arose from mesodermal derivatives. Copyright
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    Evaluation of a novel PTFE material for use as a means for separation and preconcentration of trace levels of metal ions in sequential injection (SI) and sequential injection lab-on-valve (SI-LOV) systems: Determination of cadmium(II) with detection by electrothermal atomic absorption spectrometry (ETAAS)
    (2004-10-11) Xiangbao Long; Roongrat Chomchoei; Piotr Gała; Elo Harald Hansen; Danmarks Tekniske Universitet; Mahidol University; Politechnika Poznanska
    The operational characteristics of a novel poly(tetrafluoroethylene) (PTFE) bead material, granular Algoflon®, used for separation and preconcentration of metal ions via adsorption of on-line generated non-charged metal complexes, were evaluated... by electrothermal atomic absorption spectrometry (ETAAS), its performance was compared to that of a previously used material, Aldrich PTFE, which had demonstrated that PTFE was the most promising for solid-state pretreatments. By comparing the two materials