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Heat transfer in human hair / E. Petrovicova in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 41, N° 4 (08/2019)
[article]
Titre : Heat transfer in human hair Type de document : texte imprimé Auteurs : E. Petrovicova, Auteur ; Y. K. Kamath, Auteur Année de publication : 2019 Article en page(s) : p. 387-390 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaleur sèche
Cheveux -- analyse
Modèles mathématiques
ThermocinétiqueIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : In the process of daily grooming, human hair often undergoes heat treatments. These treatments create temperature gradients inside individual hair fibres or bundles of hair which can lead to hair damage.
- Methods : Mathematical models were built for heat transfer in a single hair as well as thin tresses of hair during blow drying.
- Results : Mathematical analysis led to temperature profiles suggestive of fast transfer of heat in a single hair mainly through conduction. However, in a hair assembly, the process involved both conduction and convection leading to a slower rate of heat transfer. Penetration of heat to the centre of the hair assembly took minutes rather than seconds.
- Conclusion : This model is useful in understanding hair damage potential in styling hair with high temperature devices such as flat irons and processes which involve deforming hair at relatively high temperatures.Note de contenu : - Background
- Heat transfer analysis and temperature profiles during hair drying
- Air flow properties and heat transfer coefficient calculations
- Results and discussion : Results from mathematical analysis
DOI : 10.1111/ics.12553 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33118
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 41, N° 4 (08/2019) . - p. 387-390[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21170 - Périodique Bibliothèque principale Documentaires Disponible Heat transfer with plastics versus metals / Tobias Epple in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)
[article]
Titre : Heat transfer with plastics versus metals : Which fillers are best suited for thermally conductive plastics, and how they can help replace metals Type de document : texte imprimé Auteurs : Tobias Epple, Auteur Année de publication : 2021 Article en page(s) : p. 41-43 Langues : Anglais (eng) Catégories : Charges (matériaux)
Matières plastiques -- Additifs
Métaux -- Suppression ou remplacement
Polyamide 6
ThermocinétiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : For many components, the use of metal-replacing plastics is an attractive possibility e. g. to save weight and benefit from enhanced design freedom. In various applications, however, the thermal conductivity of the polymers is of equal importance. There are different additives that can be used to enhance this property. In the development of two polyamide families, Domo Engineered Materials investigated which of those additives are especially useful to this end, and applied Light Flash Analysis to examine the materials. Note de contenu : - Two additives ahead of the rest
- Part geometry determines thermal conductivity
- Two measuring methods, one device
- Metals often over-designed
- Two case stories
- Figure : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring
- Fig. 1 : In-plane thermal conductivity measuring of PA6 with various different fillers: the thermal conductivity (TC) depends on the additive. In some cases it rises considerably at an additive content of 40 % or higher
- Fig. 2 : Through-plane thermal conductivity measuring of PA6 with various different fillers: boron nitride and graphite deliver the best values
- Fig. 3 : Combined results of in-plane and through-plane thermal conductivity measuring: isotropic materials show TC values on the bisector of the quadrant. The TC values of anisotropic materials are far away from the axis. Therefore, proper material selection must not only take the TC value in consideration, but also the part geometry
- Fig. 4 : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring
- Fig. 5 : Example of heat transfer through the heat sink of an LED: the heat (T2) on surface A passes through the heat sink (heat flow Q) and can then dissipate to the environment. The difference between T1 and T2 results in the thermal conductivity (h)
- Table : Comparison of thermal conductivities of plastics and metal: the higher the thermal conductivity of the material, the smaller the difference in temperature between both pointsEn ligne : https://drive.google.com/file/d/1dtsdpVbwWksFJP2uhQLGbFYRAGCmWf2F/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36178
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 41-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22867 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Heating up with infrared : Properly adjusted radiators make the production more efficient Type de document : texte imprimé Auteurs : Robert Eder, Auteur Année de publication : 2016 Article en page(s) : p. 147-149 Langues : Anglais (eng) Catégories : Chauffage
Rayonnement infrarouge
ThermocinétiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : Heat transfer - For plant operators it is often difficult to find the suitable infrared radiator for the respective application since the radiation and emission behavior of the radiation sources must suit the absorption behavior of the products to be heated. If all parameters are correct, efficiency and process reliability increase and the number of scrap components is reduced. Note de contenu : - Radiation sources and their range of operation in the electromagnetic spectrum : Short-wave bright radiators (a), fast medium-wave radiators (b), medium-wave radiators (c), long-wave (ceramic) radiators (d)
- Attune important radiation parameters to the process
- Application examples
- FIGURES : 1. Different emission characteristics : The higher the temperature, the more the maximum of the radiance (dashed lines) shifts into the short-wave range. The course of the emission coefficient (continuous lines), however, varies greatly depending on the radiator type - 2. Medium-wave STIR radiators for heating technical textiles - 3. IR throughput plant for heating different lacquer systems : Inside, there are zones with long-wave ceramic radiators (front), short-wave bright radiators (middle) and medium-wave STIR radiators - 4. Heating of a copper foil, which is graphite-coated on both sides, by means of medum-wave infrared STIREn ligne : https://drive.google.com/file/d/1A1OhKl7H13O373DwSe4sdTp7BUlLJyGP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28087
in KUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 10 (10/2016) . - p. 147-149[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18402 - Périodique Bibliothèque principale Documentaires Disponible High performance leather based on in situ formation of reduced graphene oxide in chrome tanning / Xinle Yang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 5 (05/2022)
[article]
Titre : High performance leather based on in situ formation of reduced graphene oxide in chrome tanning Type de document : texte imprimé Auteurs : Xinle Yang, Auteur ; Yanchun Li, Auteur ; Mao Yang, Auteur ; Xugang Dang, Auteur ; Shan Cao, Auteur Année de publication : 2022 Article en page(s) : p. 206-211 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux
Cuirs et peaux -- Propriétés mécaniques
Matériaux hautes performances
Oxyde de graphène
Tannage au chrome
Température de retrait
ThermocinétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel method of high performance leather prepared via in situ reduction of graphene oxide after tanning was proposed in this research. First, nano-graphene oxide (GO) was prepared by an improved Hummers method. Then, the prepared GO was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Finally, GO was added during the chrome tanning process, and GO was reduced by ascorbic acid after the chrome tanning was completed. Moreover, the shrinkage temperature, tensile strength, tear strength and thermal conductivity of the finished leather were investigated. The results showed that the absorption of chrome tanning agent was significantly improved by the addition of GO. The tensile strength, tear strength, and the thermal conductivity of the resulted leather obviously surpassed the leather tanned by chrome tanning agent. Specifically, the tensile strength and tear strength of the leather reached 21.25 MPa and 163.95 N·mm-1 , respectively, when the amount of reducing agent was ten times the amount of GO. A combination of the tanning of leather and the in situ reduction of GO is expected to become a new processing method for preparation of high performance. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Preparatio of GO - Tanning process - Reduction of GO - Characterization - Physicochemical properties of leather
- RESULTS AND DISCUSSION : Infrared analysis of GO - XRD analysis of GO - Morphology analysis - XPS analysis of GO - Physical - mechanical properties testing of leather - Thermal conductivity testing of leather
- Table 1 : Experimental scheme for in-situ reduction of GO
- Table 2 : Chemical composition of grpahite and GO
- Table 3 : Physical - mechanical properties of leatherDOI : https://doi.org/10.34314/jalca.v117i5.4917 En ligne : https://drive.google.com/file/d/19dT_nj0m_Vl53ZtahY9OQbpl-TY3vzkU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37571
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 5 (05/2022) . - p. 206-211[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23398 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Hot spot solution Type de document : texte imprimé Auteurs : Rainer Haslauer, Auteur Année de publication : 2018 Article en page(s) : p. 10-12 Langues : Anglais (eng) Catégories : Assemblages collés
Charges (matériaux)
Composants électriques et électroniques -- Collage
Hydroxyde d'aluminium
Polymères thermoconducteurs
ThermocinétiqueIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : The trend is obvious: Whether in the automotive industry, in communication and power electronics or in the area of eMobility - new appliances and products become progressively smaller. At the same time, more and more functions should be packed into minimal space. But how can electronic components, assemblies and systems be downsized without overheating, losing performance or even cause malfunctions? Note de contenu : - Customized systems technology is key
- Thermal pastes vs. pads and foils
- Apply thermally conductive resins up to 3 times faster
- Fig. 1. In the lighe of continuously smaller assemblies and rising power density, the issue of thermal management becomes more and more important
- Fig. 2. Aluminium hydroxide filler, 2000x resolution
- Fig. 3. Using thermally conductive pastes reduces mechanical stress during assembly, and thus the risk of rejects
- Fig. 4. Piston dispenser Dos P016 TCA
- Fig. 5. Results of the tests series with a highly filled 2°C silicone material (for two weighing samples)En ligne : https://drive.google.com/file/d/1Ou4L6TJdu5dHbicsi2s-TF_Cvu1KMb8_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30227
in ADHESION - ADHESIVES + SEALANTS > Vol. 15, N° 1/2018 (2018) . - p. 10-12[article]Réservation
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