The oxidative dehydrogenation of isobutane to isobutene was examined for the use in the preparation of FSM-16 and related compounds doped by chromium with expectations that a yield of isobutene of greater than 8% coul...The oxidative dehydrogenation of isobutane to isobutene was examined for the use in the preparation of FSM-16 and related compounds doped by chromium with expectations that a yield of isobutene of greater than 8% could be achieved. The activity depended on the molding procedure of the catalyst and the doping method of the chromium species. In the present study, 8.8% and 8.3% of the yield of isobutene were obtained at 0.75 h and 6 h on-stream for the catalyst （Cr-loading; 6.2 wt.%） molded using wet treatment hut not pressurization treatment, in which the chromium species were directly added into the aqueous solution containing raw FSM-16 （hydrated sodium silicate powder） at an initial stage of the catalyst preparation. The structure information was based on XRD （X-ray diffraction）, the specific surface area was determined using a conventional BET （Brunauer-Emmett-Teller） nitrogen adsorption and the loading of chromium was estimated using ICP （inductively coupled plasma）. All those parameters combined with the molding method indicated that the catalytic activity was more influenced by the loading of chromium into bulk but not on surface of the catalyst rather than by the hexagonal structure of FSM-16 and the surface area.展开更多
This study presents a method for classifying cow and horse leather using a small number of digital microscope images and topological data analysis.In this method,hair pore coordinates in the images are used as essenti...This study presents a method for classifying cow and horse leather using a small number of digital microscope images and topological data analysis.In this method,hair pore coordinates in the images are used as essential information for classification.First,the coordinates were semiautomatically extracted using conventional image processing methods and persistent homology(PH)computation.Binary images with white pixels corresponding to the coordinates were generated,and their PHs were computed using filtration based on the Manhattan distance.In addition to the pairwise distance between the two pores,zeroth-and first-order lifetimes were used as explanatory variables to construct the classifier.Among the three explanatory variables,the zeroth-order lifetime resulted in the highest classification accuracy(86%)for the test data.Furthermore,we constructed logistic regression(LR)and random forest(RF)models using the zeroth-order lifetime computed from all images and conducted model interpretation.In both LR and RF,information on a zeroth-order lifetime of less than 10 was used as an important explanatory variable.Additionally,the inverse analysis of birth-death pairs suggested that the zeroth-order lifetime contains topological information distinct from the conventional pairwise distance.Our proposed method is designed to be robust in datalimited situations because it only uses hair pore coordinates as explanatory variables and does not require other information,such as hair pore density or pore size.This study demonstrates that accurate classifiers can be obtained using topological features related to hair pore arrangement.展开更多
文摘The oxidative dehydrogenation of isobutane to isobutene was examined for the use in the preparation of FSM-16 and related compounds doped by chromium with expectations that a yield of isobutene of greater than 8% could be achieved. The activity depended on the molding procedure of the catalyst and the doping method of the chromium species. In the present study, 8.8% and 8.3% of the yield of isobutene were obtained at 0.75 h and 6 h on-stream for the catalyst （Cr-loading; 6.2 wt.%） molded using wet treatment hut not pressurization treatment, in which the chromium species were directly added into the aqueous solution containing raw FSM-16 （hydrated sodium silicate powder） at an initial stage of the catalyst preparation. The structure information was based on XRD （X-ray diffraction）, the specific surface area was determined using a conventional BET （Brunauer-Emmett-Teller） nitrogen adsorption and the loading of chromium was estimated using ICP （inductively coupled plasma）. All those parameters combined with the molding method indicated that the catalytic activity was more influenced by the loading of chromium into bulk but not on surface of the catalyst rather than by the hexagonal structure of FSM-16 and the surface area.
文摘This study presents a method for classifying cow and horse leather using a small number of digital microscope images and topological data analysis.In this method,hair pore coordinates in the images are used as essential information for classification.First,the coordinates were semiautomatically extracted using conventional image processing methods and persistent homology(PH)computation.Binary images with white pixels corresponding to the coordinates were generated,and their PHs were computed using filtration based on the Manhattan distance.In addition to the pairwise distance between the two pores,zeroth-and first-order lifetimes were used as explanatory variables to construct the classifier.Among the three explanatory variables,the zeroth-order lifetime resulted in the highest classification accuracy(86%)for the test data.Furthermore,we constructed logistic regression(LR)and random forest(RF)models using the zeroth-order lifetime computed from all images and conducted model interpretation.In both LR and RF,information on a zeroth-order lifetime of less than 10 was used as an important explanatory variable.Additionally,the inverse analysis of birth-death pairs suggested that the zeroth-order lifetime contains topological information distinct from the conventional pairwise distance.Our proposed method is designed to be robust in datalimited situations because it only uses hair pore coordinates as explanatory variables and does not require other information,such as hair pore density or pore size.This study demonstrates that accurate classifiers can be obtained using topological features related to hair pore arrangement.
