Topics of Ph.D. thesis for students in doctoral study program 2013

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Some special protective garments like anti-ballistic vests do not support the water and vapour transfer in thethickness direction. Therefore, moisture must be evaporated from the edges of the used clothing pieces.Unfortunately, standard methods do not make possible to measure and investigate the in-plane moisturetransfer in fabrics. In the study, a new experimental method will be used, which enables the determination ofthis unusual way of moisture transfer in textiles. Experimental results will be compared with the theoreticalones.Thema: Air transmission in the plane of protective garmentsSupervisors: prof. Ing. Luboš Hes, DrSc. Dr. h. c.Supervisor specialist: doc. Ing Vladimír Bajzik, Ph.D. and Ing. Marie Havlová, Ph.D.Contact email for more information: lubos.hes@tul.cz, vladimir.bajzik@tul.cz, marie.havlova@tul.czSome special protective garments like anti-ballistic vests do not allow the air transfer in the thicknessdirection. Therefore, air exchange must take place from the edges of the used fabrics. Unfortunately,standard methods do not provide the study of the in-plane air transmission in fabrics. In the study, a newexperimental method will be used, which enables the determination air permeability of textiles in this unusualdirection. Experimental results will be compared with the theoretical ones.Thema: Thermal resistance of firemen clothing exposed to large radiation heat fluxSupervisors: prof. Ing. Luboš Hes, DrSc. Dr. h. c.Supervisor specialist: doc. Ing Vladimír Bajzik, Ph.D.Contact email for more information: lubos.hes@tul.cz, vladimir.bajzik@tul.czFiremen clothing made of aramide and nomex fibres protects the wearer against large radiation flux.Standard test methods for determination of thermal resistance of such clothing cannot be employed, as mostof the heat passing through the clothing during their use in action is transferred by radiation. That is why newstandards of testing of clothing under conditions simulating the real radiation flux were developed in the lastdecade. However, heat flux in these testing systems is measured by means of dynamic thermal calorimeters,which exhibit certain disadvantages. In the study, a novel method of determination of thermal resistance offiremen clothing will be used, which is based on the use of vertical hotplate which enable steady state heatflux measurements by means of special high temperature resistant sensors.Thema: Cooling efficiency of fabrics made of micro and nanofibresSupervisors: prof. Ing. Luboš Hes, DrSc. Dr. h. c.Supervisor specialist: Ing. Pavla Tesinová, Ph.D.Contact email for more information: lubos.hes@tul.cz, pavla.tesinova@tul.czFabrics with high cooling flux in wet state may may contribute to thermal comfort of a weather in the hot-wetclimate. The cooling flux increases with the mass transfer surface of the studied fabrics, but also depends oncomposition and geometry of these special fabrics. In the study, the effect of the mentioned parameters offabrics made of micro- and nanofibres on their cooling flow will be theoretically and experimentally analyzed.Thema: Air permeability of fabrics as the function of the air humidity and temperatureSupervisor: prof. Ing. Luboš Hes, DrSc. Dr. h. c.Supervisor specialist: doc. Ing Vladimír Bajzik, Ph.D.Contact email for more information: lubos.hes@tul.cz, vladimir.bajzik@tul.czIn last decades, many studies were published, in which the effect of the air humidity and temperature on thefabrics air permeability was theoretically and experimentally analyzed. However, most of the studies refers tothe fabric permeability at the standard laboratory conditions, but in the real life, fabrics are also used atdiferent climatic conditions. The purpose of the study is to investigate theoretically and experimentally the airpermeability (air flow) of selected textile fabrics (differing in structure and composition) at large extension ofthe air humidity and temperature. New experimental setup for this study is available.Theme: Thermal Behavior of Aerogel Based MaterialsSupervisor: prof. Ing. Jiří Militký, CSc.Supervisor specialist: assoc. prof. Rajesh MishraContact email for more information: jiri.militky@tul.cz, rajesh.mishra@tul.czPhysical and chemical properties of aerogels, Use of aerogels for different textile applications, Identificationof the suitable aerogel and novel thermal insulating material for the developmental work, Working out the testTECHNICAL UNIVERSITY OF LIBEREC | Faculty of Textile Engineering | Studentská 1402/2 | 461 17 Liberec 1tel.: +420 485 353258 | www.ft.tul.cz | IČ: 467 47 885 | DIČ: CZ 467 47 885
plan for the evaluation of sample materials, Evaluation of the developed sample materials for thermalconductivity and convection in order to identify the promising approaches, Particle image velocimetry (PIV)and TCi evaluation, Morphological and Thermal studies of the samples produced, Creation programs forcomputer assisted prediction of thermal conductivity and transient diffusion, Optimization of the processparameters for the promising approaches, Scaled- up production of the material/s, Optimization ofcomposition of multi-layered structures by programs for thermal conductivity and transient diffusion, Modelingof thermal insulation behavior for various textile structures.Theme: Functional Composites and Nanocomposites with 3D Fibrous ArchitectureSupervisor: assoc. prof. Rajesh MishraSupervisor specialist: doc. Dr. Ing. Dana KřemenákováContact email for more information: rajesh.mishra@tul.cz, dana.kremenakova@tul.czDesign and development of 3D woven structures with different fibre materials using various fabricmanufacturing technologies e.g. 2D & 3D weaving, braiding, triaxial weaving etc., Evaluation of highperformance properties for 3D fabrics e.g. impact resistance, knife penetration resistance, irradiationresistance etc., Development of composites based on 3D woven aramid fabrics, Energy absorptionmechanism of composites, Mechanical resistance characterization, stress-strain behavior, initial modulus,ultimate strength and elongation,Complex characterization of mechanical resistance by ball bursting test, Cutresistance, Dynamic mechanical analysis (DMA), Thermogravimetric analysis (TGA), Modeling of 3-DOrthogonal Fabric reinforced composites and nanocomposites using Finite Element modelling.Theme: Modeling, Simulation, Prediction and Measurements of Heat and Moisture TransportProperties of Fibrous StructuresSupervisor: prof. Ing. Jiří Militký, CSc.Supervisor specialist: doc. Dr. Ing. Dana KřemenákováContact email for more information: jiri.militky@tul.cz, dana.kremenakova@tul.czModeling and simulations for complex fibrous structures in thermal property, mechanism of heat transfer infibrous structures, temperature distribution in fibrous structures, Comparison of the theoretical results withexperimental results to find the correlation, Analysis of theoretical models and simulations, design andoptimization of complex fibrous structures, textile structures composed from specialty fibres and fibres withspecial geometry (hollow, grooved etc.), The influence of fibrous phase and porosity on fibrous structurethermal conductivity.Theme: Application of Nanoidentation for Characterization of Fibres and Reinforced NanocompositesSupervisor: doc. Dr. Ing. Dana KřemenákováSupervisor specialist: assoc. prof. Rajesh MishraContact email for more information: dana.kremenakova@tul.cz, rajesh.mishra@tul.czNanoindentation as a tool to investigate the mechanical properties of materials at nanometer-scaledisplacement and smaller load range, functionally graded materials, nanocomposites, heterogeneousmaterials in various engineering areas, mechanical and biomedical engineering, a critical evaluation of thestress and deformation, prediction of reliability and failure behavior of polymer structures, mechanicalproperties of the surface of polymers, load-displacement behavior carried out by applying the increasing loadand decreasing load, evaluation of the indentation hardness, applications with sharp and geometrically selfsimilarindenters, hardness and elastic modulus as a function of the imposed contact conditions, coefficientsof strain-rate sensitivity of plastic performances, plastic deformation and mobility in a solid, loading ratesensitivity (LRS), application to fibres and composite properties in nano dimension.Theme: New types of Side Emitting Polymer Optical Fibrous MaterialsSupervisor: doc. Dr. Ing. Dana KřemenákováSupervisor specialist: assoc. prof. Rajesh MishraContact email for more information: dana.kremenakova@tul.cz, rajesh.mishra@tul.czEnhanced side emission effect of plastic optical fiber (POF) by thermal treatment, controlled degradation andsurface modification to avoid total internal reflection. New methods for enhancement of side emission,Comparison of different methods to find the best way for side emission.TECHNICAL UNIVERSITY OF LIBEREC | Faculty of Textile Engineering | Studentská 1402/2 | 461 17 Liberec 1tel.: +420 485 353258 | www.ft.tul.cz | IČ: 467 47 885 | DIČ: CZ 467 47 885
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