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3D reconstruction method of leather fiber bundle weaving network / Huayong Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 8 (08/2018)
[article]
Titre : 3D reconstruction method of leather fiber bundle weaving network Type de document : texte imprimé Auteurs : Huayong Zhang, Auteur ; Tianduo Li, Auteur Année de publication : 2018 Article en page(s) : p. 248-254 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux de bovins
Imagerie tridimensionnelle
Structures tridimensionnelles
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A 3D reconstruction method of leather fiber bundles and their weaving network was developed. The main steps included: leather metallographic sample preparation, sequential section images acquisition, registration and alignment, image preprocessing and 3D reconstruction. Metallographic sample preparation and layer-by-layer grinding methods were used to obtain sequential sections images. 3D-Doctor medical reconstruction software was used to implement the 3D reconstruction of leather fiber bundles. Features and cautions of each step were discussed, and some reconstruction results were displayed. Note de contenu : - MATERIALS AND METHODS : Experimental materials and instruments - Experimental procedure - Metallographic sample preparation of leather - Acquisition of sequential section images - Registration and alignment of sequential section images - Image preprocessing - 3D reconstruction using 3D-doctor software
- RESULTS AND DISCUSSION : Effect of metallographic leather sample preparation - Cautions in acquisition of sequential section images - Image registration skills - Selection of image processing method - 3D reconstruction of leather fiber network using 3D-doctor software - Morphological analysis of fiber bundlesEn ligne : https://drive.google.com/file/d/1rTmm7uNmLeKStSUTQKZ65rr5HJUp6j3S/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30841
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 8 (08/2018) . - p. 248-254[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20115 - Périodique Bibliothèque principale Documentaires Disponible Accurate and simple method for simultaneous determination of restricted ethylene glycol ethers and esters in leather by GC-MS / He-Wei Ma in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 3 (05-06/2021)
[article]
Titre : Accurate and simple method for simultaneous determination of restricted ethylene glycol ethers and esters in leather by GC-MS Type de document : texte imprimé Auteurs : He-Wei Ma, Auteur ; Luo Jian-Xun, Auteur Année de publication : 2021 Article en page(s) : p. 117-123 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique
Chromatographie en phase gazeuse
Cuirs et peaux -- Analyse
Esters
Ethers
Ethylène glycol
Extraction (chimie)
Spectrométrie de masseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : An analytical approach was developed for the simultaneous determination of the eight ethylene glycol ethers (EGEs) and esters (EGEEs) prohibited by European Union (EU) REACH regulation in leather samples. The analytes were extracted using methanol with ultrasonic assistance within 30 minutes. The extracts were cleaned up by passing the extraction solution through a cartridge containing alumina-N frits, and the eluate was injected into GC-MS which was fitted with a 60m length capillary DB-WAX column. Excellent separation of the eight EGEs/EGEEs was achieved by the capillary column within 25 minutes. The clean-up with Alumina-N cartridge presented desired efficiency for removing the co-extractives in the extracts. The major advantages of this method are the simplicity and accuracy. Limitation of the detection, linear range, and reproducibility of the method were evaluated. Average recoveries in the range of 91.7%-102.5% (RSD, <6.1 0/0) with detection limits at 3.09.4mg/kg for the eight targets were obtained. Analytical results showed that ethylene glycol dimethyl ether (EGDME), ethylene glycol ethyl ether (EGEE), and diethylene glycol dimethyl ether (DEGDME), were found in 22% of 95 leather samples at the concentration range of 35-82mg/kg, 12-285mg/kg and 28-66mg/kg, respectively, while the other five EGEs/EGEEs were not detected. Note de contenu : - EXPERIMENTAL PROCEDURES : Chemicals - Apparatus - Preparation and storage of standards - Sampling - Sample extraction - Extract clean-up - Instrumental analysis
- RESULTS AND DISCUSSION : Selection of capillary column - Sample preparation - Effects of extraction time and temperature
- METHOD VALIDATION : Linearity - Limits of detection (LOD) and quantification (LOQ) - Reproducibility studies - Analysis of leather samples
- Table 1 : EGEs and EGEEs used in the experiment : Name, abbreviation, CAS N°., boiling point and monitored ions (m/z)
- Table 2 : Recoveries of eight EGEs/EGEEs by the three SPE cartridges
- Table 3 : Recoveries in the spiked negative leather with different temperature and time
- Table 4 : Effects of MgSO4 used in the extraction process on the test results
- Table 5 : Calibration data, precision and detection limits for the selected compounds
- Table 6 : Levels of the prohibited EGEs/EGEEs found in leather samplesEn ligne : https://drive.google.com/file/d/1N6bhRrkh3wBBN1EUu33c6Tv8ADpSMiXw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35831
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 3 (05-06/2021) . - p. 117-123[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22745 - Périodique Bibliothèque principale Documentaires Disponible Acoustic emission studies for leather using dual sensors / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 4 (04/2010)
[article]
Titre : Acoustic emission studies for leather using dual sensors Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Joseph Lee, Auteur Année de publication : 2010 Article en page(s) : p. 109-115 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs (technologie)
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés mécaniques
Emission acoustique
Rigidité (mécanique)
Rupture (mécanique)
Traction (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since leather is sold by the square foot, destructive tests lessen the square footage of the material and infringe on the leather manufacturer's total profit. Therefore there is a need for developing an instrument to perform nondestructive testing of the physical properties of leather. In this investigation, experiments were designed to pass leather test samples through a pair of rotational acoustic sensors, thereby enabling the collection of acoustic emission (AE) signals from both the grain and corium and provide a more accurate assessment of the quality of leather. Observations showed a strong correlation between the mechanical properties of leather and the corresponding cumulative acoustic energy. We also used this dynamic method to characterize the grain break of leather. Results showed that the difference in grain break could be determined form the amount of acoustic hits collected from moving the AE sensors over a leather sample. Observations showed the poorer the grain break ; the more AE energy was detected. Data also demonstrated that thicker samples tended to have poorer grain break. In short, this study demonstrated that the tensile strength, stiffness, toughness ans grain break could be nondestructively determined by measuring acoustic quantities with a pair of rotational sensors. Note de contenu : - EXPERIMENTAL : Materials - AE methods and apparatus - Tensile property measurements
- RESULTS AND DISCUSSION : Correlation between AE quantities and physical properties - Leather stiffness - AE evaluation of breakEn ligne : https://drive.google.com/file/d/1wnXpDZQhYpMFyJR0RdXJp95cXy-G6hX1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9075
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Code-barres Cote Support Localisation Section Disponibilité 012085 - Périodique Bibliothèque principale Documentaires Disponible Acquisition and observation methods of three-dimensional leather structure based on micro-CT / Huayong Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 3 (05-06/2019)
[article]
Titre : Acquisition and observation methods of three-dimensional leather structure based on micro-CT Type de document : texte imprimé Auteurs : Huayong Zhang, Auteur ; Tianduo Li, Auteur ; Yuling Wei, Auteur ; Jinyong Cheng, Auteur Année de publication : 2019 Article en page(s) : p. 150-154 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir
Cuirs et peaux -- Analyse
Imagerie tridimensionnelle
Structures tridimensionnellesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Components and working principle, parameters and data acquisition steps of micro-CT are introduced in detail. Taking the chrome-tanned leather for example, the images of each stage of the experiment are presented and the 3D digital models of leather structure with 1.5 µm resolution have been obtained by micro-CT. It lays a good foundation for the study of leather structure by micro-CT. Note de contenu : - EXPERIMENTAL MATERIALS AND INSTRUMENTS
- EXPERIMENTAL METHODS : Composition and principle of micro-CT - Projection images acquisition by micro-CT
- RESULTS AND DISCUSSIONS : Determination of scanning parameters - Reconstruction and observation of 2D section images - Reconstruction and observation of 3D imagesEn ligne : https://drive.google.com/file/d/1SQkbYLvrHjg_RwtX74NifNcrrxzzOvxq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32672
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 3 (05-06/2019) . - p. 150-154[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20989 - Périodique Bibliothèque principale Documentaires Disponible Action of pancreatin on residual epidermis of goatskin-examination via histological changes during bating / Ding Haiyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)
[article]
Titre : Action of pancreatin on residual epidermis of goatskin-examination via histological changes during bating Type de document : texte imprimé Auteurs : Ding Haiyan, Auteur ; Liegang Sun, Auteur ; Liang Chengjian, Auteur Année de publication : 2005 Article en page(s) : p. 141-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Analyse
Cuirs et peaux de chèvres
Epiderme
Pancréatine
Peau -- HistologieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The histological changes of the epidermis of goatskin under different bating conditions were observed at the ultrastructure level by TEM and SEM. The results showed that the residual epidermal matter was obviously removed from the surface of delimed pelt by pancreatin in the normal bating process and this action will be strengthened by both an increase of the amount of pancreatin and by prolonging the bating time. Evidence is provided of the function of pancreatin in bating, eliminating scud and clarifying the grain surface. Note de contenu : - Sample preparation
- Sampling and fixation
- Specimen preparation for TEM
- Specimen preparation for SEMEn ligne : https://drive.google.com/file/d/1QycDHpTwbj8x1N0qDVsipv-7Dub3lvSU/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39244
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 141-144[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Adding value to sheep leather via coating with green synthesised zinc oxide nanoparticles approaches for advanced leather products / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 6 (11-12/2022)
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