Determination of chloride and sulphate ions in leather pickling liquor by low-pressure ion chromatography / Bo Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) . - p. 6-9 Titre : Determination of chloride and sulphate ions in leather pickling liquor by low-pressure ion chromatography Type de document : texte imprimé Auteurs : Bo Li, Auteur ; Fan Zhang, Auteur ; Zhang Xinshen, Auteur Année de publication : 2004 Article en page(s) : p. 6-9 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Chromatographie Eaux usées -- Analyse Ions chlorure Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Statistique Sulfates Le sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The deleterious effects on the quality of soil and ground waters of electrolytes discharged as a result of salts used by the tanning industry is of concern now more than ever. The electrolyte is usually in the form of chloride and sulphate and thus it is necessary to determination chloride ion and sulphate ion in tanning effluents. The determination of chloride ion and sulphate ion in leather pickling liquor is important to determine the salt’s contribution to the total salt concentration of the sewage for each process. The aim of this work is to apply LPIC (without using a suppressor column) to the quantitative determination of chloride ion and sulphate ion in pickle liquor. Tests of precision, recovery and linear range were also conducted to evaluate the above method. The results show that the coefficients of variation are less than 4.77% or 3.76% with recoveries of 99.95% and 102.31% for chloride ion and sulphate ion respectively. Two calibration curves were obtained over the concentration range of 10 to 30 mg/L for chloride and 30 to 300 mg/L for sulphate. The detection limits of the method developed for chloride ion and sulphate ion are 0.144 and 2.853 mg/L respectively. LPIC performed without a suppressor column is shown to be suitable as a method for quantitative determination of chloride ion and sulphate ion in leather pickling liquor. Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Reagents and solutions - Sample preparation - RESULTS AND DISCUSSION : Choice of column - Choice of eluent - Eluent concentration - Effect of pH - Linearity tests - Precision tests - Detection limit - Analysis of real samples - Table 1 : Chromatographic conditions for the analysis of inorganic anions - Table 2 : Result of the statistical treatment performed on pairs of LPIC data - Table 3 : Results of precision tests - Table 4 : Determination of chloride and sulphate concentration in leather pickling liquor En ligne : https://drive.google.com/file/d/1UboMr69zI0I7MlSoXPCZw8XWfzWn0r-n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39648 [article]

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The center of pressure progression characterizes the dynamic function of high-arched feet during walking / Bo Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 10 p. Titre : The center of pressure progression characterizes the dynamic function of high-arched feet during walking Type de document : texte imprimé Auteurs : Bo Li, Auteur ; Qipeng Xiang, Auteur ; Xianyi Zhang, Auteur Année de publication : 2020 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des données Marche Pied Tags : 'Haute-arche'  'Marche'  'Centre  de  pression'  Rapidité Index. décimale : 613.71 Exercice et activités sportives Résumé : - Background : The medial longitudinal arch height has an effect on kinetic parameters during gait and might be related to the risk of injury. For the assessment of foot structures, the center of pressure (COP) trajectory is a more reliable and practical parameter than plantar pressure. This study aimed to clarify the COP trajectory and velocity characteristics in the medial-lateral and anterior-posterior direction of individuals with a high-arched foot during barefoot walking. - Methods : Sixty-two healthy young adults were asked to walk over a Footscan pressure plate to record the COP parameters during the stance phase of walking. - Results : Compared to normal arched feet, the COP during forefoot contact and foot flat phases of high-arched feet shifted anteriorly (19.9 mm and 15.1 mm, respectively), and the mean velocity of COP in anterior-posterior direction decreased by 0.26 m/s and increased by 0.044 m/s during these two phases respectively. - Conclusions : The findings of this study suggest that the displacement and velocity of COP in anterior-posterior direction was different between high-arched and normal-arched subjects during barefoot walking, which can be used for the assessment of gait characteristics for high-arched individuals. The results of this study may provide insights into modifying clinical intervention for individuals with high-arched feet to enhance rehabilitation and prevent injuries and have implications for assessing the design of footwear and foot orthotics. Note de contenu : - Participants - Materials and apparatus - Procedures - Data analysis - Table 1 : Statistics of subjects - Table 2 : Comparison of ML-COP deviation and velocity between high-arched and normal feet - Table 3 : Comparison of AP-COP deviation and velocity between high-archedes and normal feet DOI : 10.1186/s42825-019-0016-6 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0016-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37137 [article]

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The dynamic characteristics of the center of pressure for toe-out gait : implications for footwear design / Bo Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 9 p. Titre : The dynamic characteristics of the center of pressure for toe-out gait : implications for footwear design Type de document : texte imprimé Auteurs : Bo Li, Auteur ; Xianyi Zhang, Auteur Année de publication : 2022 Article en page(s) : 9 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Marche Tags : Pincement  'Centre  de  pression'  Marche  Rapidité Index. décimale : 685.3 Chaussures Résumé : - Background : Toe-out gait is often used as a conservative technique to reduce knee adduction moment, which has been targeted to modify knee osteoarthritis progression. The center of pressure (COP) can not only be used to evaluate gait stability, but is also more reliable and practical than local plantar pressures as it does not depend on accurate foot zone divisions. However, to the authors’ knowledge, few study has reported the influence of the foot progression angle on the dynamic characteristics of the COP. - Research question : The aim of the study was to investigate the effects of the deliberately toe-out gait on the COP trajectory and stability during walking in healthy individuals. - Methods : Thirty healthy young adults were asked to walk along an 8-m walkway. A Footscan 1 m pressure plate was used to measure the center of pressure during walking. - Results : Compared to the normal gait, the COP of the toe-out gait shifted laterally during the initial contact phase, and shifted laterally and anteriorly during the forefoot contact phase. The mean anterior–posterior velocity of COP reduced by 0.109 m/s during the foot flat phase and the duration of the foot flat phase and forefoot push off phase increased by 4.5% and reduced by 7.0%, respectively. - Significance : Compared to the normal gait, the findings of this study suggest that biomechanical alteration of foot under our experimental conditions may decrease gait stability and increase forefoot load during toe-out walking. The situation may be improved by well-designed footwear or custom-made insole and the biomechanics analysis method can be used to test the efficacy of therapeutic footwear or insole for individuals with deliberately toe-out walking. Note de contenu : - Participants - Materials and apparatus - Procedures - Data analysis - Table 1 Comparison of ML-COP deviation and velocity between toe-out and normal gait - Table 2 Comparison of AP-COP deviation and velocity between toe-out and normal gait - Table 3 Time comparisons between toe-out and normal gait DOI : https://doi.org/10.1186/s42825-022-00088-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00088-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37579 [article]

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