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- 저자 : Vassiliadis, Vassilios S. (검색결과 6 건)
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Lee, Min Woo,Vassiliadis, Vassilios S.,Park, Jong Moon Wiley Subscription Services, Inc., A Wiley Company 2009 Biotechnology and bioengineering Vol.103 No.5
<P>In this article, we propose an individual-based and stochastic modeling approach that is capable of describing the bacterial cell population dynamics during a batch culture. All stochastic nature inherent in intracellular molecular level reactions and cell division processes were considered in a single model framework by embedding a sub-model describing individual cell's growth kinetics in a discrete event simulation algorithm. The resultant unique feature of the model is that the effects of the stochasticities on the cell population dynamics can be investigated for different substrate-dependent cell growth kinetics. When Monod kinetics was used as the sub-model, the stochasticities only slightly affected the cell mass increase and substrate consumption profiles during the batch culture although they were still important in describing the changes of cell population distributions. When Andrews substrate inhibition kinetics was used, however, it was revealed that the overall cell population dynamics could be seriously influenced by the stochasticities. Under a critical initial substrate level, the cell population could proliferate against the substrate inhibition only when the stochasticities were considered. Biotechnol. Bioeng. 2009;103: 891–899. © 2009 Wiley Periodicals, Inc.</P>
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Low Stress Shear Behaviour of Cotton Fabrics
Davrug Inogamdjanov,Dimitroula Matsouka,Savvas Vassiliadis,Ioannis Kizlaridis,Askarali Daminov 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
Shear rigidity of woven fabrics is an important property that defines the behaviour of fabrics when they arerequired to conform to three dimensional forms, including the human body in the case of apparel textiles or preforms andprepregs used for production of fibrous polymer composite components. Typically, shear rigidity is measured usingcomplicated and expensive equipment. This paper presents the study of the influence of weave patterns on the shearbehaviour of fabrics using a simple and precise testing method. The shear behaviour of eleven cotton fabrics in total, utilizingdifferent weaving patterns and different yarn densities was investigated. Specimens of different dimensions were also testedto determine the influence of the specimen dimensions on the measured characteristics. The investigation resulted in acorrelation between the shear behaviour and the different weaving patterns. Specifically, it was shown that weave patternsthat are closer to the plain weave (firm weaves) are more restricting to the yarn rotation than loser weave patterns. Furthermore, the results show the relationship between shear behaviour and specimen dimensions as well as yarn density. Increasing the length of the specimens (the dimension of the specimen parallel to the direction in which the shearing force isapplied) or decreasing the width of the specimens (the dimension of the specimen vertical to the force application) also leadsto an increase of the shear rigidity.
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Anestis Fotiadis,Nikolaos Stylos,Chris A. Vassiliadis,Tzung-Cheng TC Huan 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
This paper develops a conceptual model relating motivation, involvement, and changes to travel style to the selection of destinations and choice of events amongst non-professional participants involved in small-scale sporting events. A longitudinal comparison of t
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Contact Area of Electrification Materials Relating to Triboelectric Generators: A Comparative Study
Aristeidis Repoulias,Irini Logothetis,Dimitra Matsouka,Savvas Vassiliadis 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.3
Triboelectric generators (TEGs) stemming from the triboelectric phenomena, are promising for energy harvesting due totheir high output power and effi ciency. Analysis of the tribo material selection for TEGs has suggested that energy generationis linked to heterogeneous and homogeneous materials found at opposite ends of the triboelectric series. Currentresearch has identifi ed that the triboelectric phenomenon also exists from contact between identical tribo materials withthe advancement of surface modifi cation. However, a comparison of composite and identical homogeneous TEGs has yetto be reported. For this research, organic polymer membranes Polyamide-6 (PA6) and Polytetrafl uoroethylene (PTFE)were evaluated. The membranes were cut into samples of varying dimensions to build three sets of TEGs for comparison. Two identical sets of four sampled TEGs were fabricated using the same membrane (i.e., PA6-PA6 and PTFE-PTFE); incontrast to a composite set of four sampled TEGs made from the two distinct membranes (i.e., PA6-PTFE). By repeatedlysampling the TEGs in sliding mode at a speed of 0.2 m/s and with a vertical force of 9.8 N an open circuit voltage ( V oc )was generated and recorded. As a result, the V oc of the identical TEGs was compared to the V oc of the composite TEG inwhich the tribo materials are located at opposite ends of the triboelectric series. It was also observed that the V oc increasedalmost linear in relation to the surface area of the TEGs; thus, suggesting that the surface area of the TEG can infl uencesignifi cantly the V oc to a great extent.
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Shahzad, Asif,Nawaz, Mohsin,Moztahida, Mokrema,Jang, Jiseon,Tahir, Khurram,Kim, Jiho,Lim, Youngsu,Vassiliadis, Vassilios S.,Woo, Seung Han,Lee, Dae Sung Elsevier 2019 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.368 No.-
<P><B>Abstract</B></P> <P>Two-dimensional (2-D) titanium carbide MXene core (Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB>) shell aerogel spheres (MX-SA) for mercuric ion removal were designed and fabricated with varying concentrations of Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene and sodium alginate (SA) using a facile method. Owing to their unique inside structures, high porosities, large specific surface areas, oxygenated functional groups of MXene nanosheets, and available active binding sites, the synthesized microspheres constitute a unique adsorbent for heavy metals removal in water. The MX-SA<SUB>4:20</SUB> spheres exhibit an exceptional adsorption capacity of 932.84 mg/g for Hg<SUP>2+</SUP>, which is among the highest value reported for adsorbents. The adsorbent exhibits high single- and multi-component removal efficiencies, with 100% efficiency for Hg<SUP>2+</SUP> and >90% efficiency for five heavy metal ions. The synthesized materials are highly efficient for Hg<SUP>2+</SUP> removal under extreme pH conditions (0.5–1.0 M HNO<SUB>3</SUB>) and have additional excellent reproducible properties. The micro-size and spherical shape of MX-SA<SUB>4:20</SUB> also allow it to be used in column-packed devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> nanosheets were synthesized using a low-toxicity etching agent (NH<SUB>4</SUB>F). </LI> <LI> Core-shell of MX-SA<SUB>4:20</SUB> spheres was capable of very effectively removing heavy metals. </LI> <LI> MX-SA<SUB>4:20</SUB> spheres exhibited exceptional Hg<SUP>2+</SUP> adsorption capacity of 932.84 mg g<SUP>−1</SUP>. </LI> <LI> MX-SA<SUB>4:20</SUB> performed excellently in extreme acidic conditions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Fabrication of MX-SA<SUB>4:20</SUB> spheres through MXene-Alginate networking and their application in Hg<SUP>2+</SUP> uptake.</P> <P>[DISPLAY OMISSION]</P>
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