Quantitative level evaluation of cold-rolled strip was significant for the shape control and the product structure optimization. Based on the probability statistics method and the shape pattern recognition method, the...Quantitative level evaluation of cold-rolled strip was significant for the shape control and the product structure optimization. Based on the probability statistics method and the shape pattern recognition method, the shape evaluation model of cold-rolled strip was established to evaluate real-time shape of the online strip. The model was embedded in the shape control system, and the online strip shape state was real-time observed whether to meet the technical indicators, so the shape level could be identified and evaluated. Based on the shape evaluation indicators, the shape component could be well controlled to improve the shape hit rate and the control stability, so that the rolled strip shape could meet the technical requirements. At a 1050 cold strip mill, the shape data of the scene typical specifications strip were online collected and real-time evaluated, and the hit of macro shape in less than 8 I was 68.44%, indicating that the mill shape control had considerable room for improvement, as well as the evaluation method was feasible and practical for quantitative evaluation of the strip shape. So the new evaluation model has important guiding significance to increase value-added and reduce product quality objection.展开更多
Objective Oil-source faults have an important effect on reservoir formation and distribution in shallow formations with non- hydrocarbon generation in oil-rich fault-related basins （Jiang Youlu et al., 2015）. Howev...Objective Oil-source faults have an important effect on reservoir formation and distribution in shallow formations with non- hydrocarbon generation in oil-rich fault-related basins （Jiang Youlu et al., 2015）. However, the fault transporting capacity cannot be evaluated quantitatively at present. Taking the Zhanhua Sag in the Bohai Bay Basin as an example, this work analyzed the factors influencing the transporting capacity of the oil-source faults and proposed a quantitative method for evaluating their transporting capacity.展开更多
Despite the fact that mixing uniformity(i.e.the consistency of binder distribution)significantly influence the quality of ground improvement during in situ soil mixing projects,its quantitative evaluation was rarely c...Despite the fact that mixing uniformity(i.e.the consistency of binder distribution)significantly influence the quality of ground improvement during in situ soil mixing projects,its quantitative evaluation was rarely concerned due to the difficulty of measurement from an engineering perspective.A methodology was proposed to quantitatively evaluate the mixing uniformity of stabilized soil using handheld Xfluorescence spectrometry(XRF),which is helpful to elucidate the significance of mixing uniformity on strength.In other words,the calcium content was monitored to ascertain the distribution of cement within the matrix,and a quantitative index was subsequently established.It was observed that an increase in mixing uniformity resulted in a transition in the behavior of the stabilized clay from a plastic to a brittle failure mode,and from a localized failure to a global shear failure under unconfined compression.Subsequent observation of the destruction process revealed that cracks were more readily formed in the low cement zones and then bypass the high cement zones.Furthermore,the effect of mixing uniformity on strength is likely to be amplified with prolonged curing periods.The enhancement of uniformity would increase the volume of the high binder zones,thereby enhancing the overall highstrength performance.The proposed methodology is capable of characterizing the discreteness between the tracked element's measured and theoretical contents,thusing avoiding the uncertainty associated with other indirect indicators.The convenience of the portable handheld XRF apparatus was confirmed,as it can be readily deployed in situ or ex situ to track calcium content within the stabilized mass after borehole sampling.展开更多
基金Item Sponsored by the National Science and Technology Support Plan of China(2011BAF15B03)National Natural Science Foundation of China(51305387)Hebei Province Colleges and Universities Natural Science Research Youth Foundation of China(Q2012104)
文摘Quantitative level evaluation of cold-rolled strip was significant for the shape control and the product structure optimization. Based on the probability statistics method and the shape pattern recognition method, the shape evaluation model of cold-rolled strip was established to evaluate real-time shape of the online strip. The model was embedded in the shape control system, and the online strip shape state was real-time observed whether to meet the technical indicators, so the shape level could be identified and evaluated. Based on the shape evaluation indicators, the shape component could be well controlled to improve the shape hit rate and the control stability, so that the rolled strip shape could meet the technical requirements. At a 1050 cold strip mill, the shape data of the scene typical specifications strip were online collected and real-time evaluated, and the hit of macro shape in less than 8 I was 68.44%, indicating that the mill shape control had considerable room for improvement, as well as the evaluation method was feasible and practical for quantitative evaluation of the strip shape. So the new evaluation model has important guiding significance to increase value-added and reduce product quality objection.
基金granted by the National Natural Science Foundation of China(grant No.41672131)Fundamental Research Funds for the Central Universities(grant No.16CX06045A)
文摘Objective Oil-source faults have an important effect on reservoir formation and distribution in shallow formations with non- hydrocarbon generation in oil-rich fault-related basins （Jiang Youlu et al., 2015）. However, the fault transporting capacity cannot be evaluated quantitatively at present. Taking the Zhanhua Sag in the Bohai Bay Basin as an example, this work analyzed the factors influencing the transporting capacity of the oil-source faults and proposed a quantitative method for evaluating their transporting capacity.
基金supported by the National Key R&D Program of China(Grant No.2019YFC1806004)the National Natural Science Foundation of China(Grant Nos.42272322 and 51878159).
文摘Despite the fact that mixing uniformity(i.e.the consistency of binder distribution)significantly influence the quality of ground improvement during in situ soil mixing projects,its quantitative evaluation was rarely concerned due to the difficulty of measurement from an engineering perspective.A methodology was proposed to quantitatively evaluate the mixing uniformity of stabilized soil using handheld Xfluorescence spectrometry(XRF),which is helpful to elucidate the significance of mixing uniformity on strength.In other words,the calcium content was monitored to ascertain the distribution of cement within the matrix,and a quantitative index was subsequently established.It was observed that an increase in mixing uniformity resulted in a transition in the behavior of the stabilized clay from a plastic to a brittle failure mode,and from a localized failure to a global shear failure under unconfined compression.Subsequent observation of the destruction process revealed that cracks were more readily formed in the low cement zones and then bypass the high cement zones.Furthermore,the effect of mixing uniformity on strength is likely to be amplified with prolonged curing periods.The enhancement of uniformity would increase the volume of the high binder zones,thereby enhancing the overall highstrength performance.The proposed methodology is capable of characterizing the discreteness between the tracked element's measured and theoretical contents,thusing avoiding the uncertainty associated with other indirect indicators.The convenience of the portable handheld XRF apparatus was confirmed,as it can be readily deployed in situ or ex situ to track calcium content within the stabilized mass after borehole sampling.
