Evaluation of flotation behavior, solution measurements, and surface analyses were performed to investigate the effects of chloride ion addition on the sulfidization of cerussite in this study. Micro-flotation tests i...Evaluation of flotation behavior, solution measurements, and surface analyses were performed to investigate the effects of chloride ion addition on the sulfidization of cerussite in this study. Micro-flotation tests indicate that the addition of chloride ions prior to sulfidization can significantly increase the flotation recovery of cerussite, which is attributed to the formation of more lead sulfide species on the mineral surface. Solution measurement results suggest that the addition of chloride ions prior to sulfidization induces the transformation of more sulfide ions from pulp solution onto the mineral surface by the formation of more lead sulfide species. X-ray diffraction and energy-dispersive spectroscopy indicate that more lead sulfide species form on the mineral surface when chloride ions are added prior to sulfidization. These results demonstrate that the addition of chloride ions prior to sulfidization can significantly improve the sulfidization of cerussite, thereby enhancing the flotation performance.展开更多
Purpose:Traumatic brain injury(TBI)is one of the leading causes of disability and death in modern times,whose evaluation and prognosis prediction have been one of the most critical issues in TBI management.However,the...Purpose:Traumatic brain injury(TBI)is one of the leading causes of disability and death in modern times,whose evaluation and prognosis prediction have been one of the most critical issues in TBI management.However,the existed models for the abovementioned purposes were defective to varying degrees.This study aims to establish an ideal brain injury state clinical prediction model(BISCPM).Methods:This study was a retrospective design.The six-month outcomes of patients were selected as the end point event.BISCPM was established by using the split-sample technology,and externally validated via different tests of comparison between the observed and predicted six-month mortality in validating group.TBI patients admitted from July 2006 to June 2012 were recruited and randomly divided into establishing model group and validating model group.Twenty-one scoring indicators were included in BISCPM and divided into three parts,A,B,and C.Part A included movement,pupillary reflex and diameter,CT parameters,and secondary brain insult factors,etc.Part B was age and part C was medical history of the patients.The total score of part A,B and C was final score of BISCPM.Results:Altogether 1156 TBI patients were included with 578 cases in each group.The score of BISCPM from validating group ranged from 2.75 to 31.94,averaging 13.64±5.59.There was not statistical difference between observed and predicted mortality for validating group.The discrimination validation showed that the BISCPM is superior to international mission for prognosis and analysis of clinical trials(IMPACT)lab model.Conclusion:BISCPM is an effective model for state evaluation and prognosis prediction of TBI patients.The use of BISCPM could be of great significance for decision-making in management of TBI.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos. 51464029 and 51304089)the Analysis and Testing Foundation of Kunming University of Science and Technology (Nos. 20130534 and 20140876)the Academic New Artist Award for Doctoral Post Graduate in Yunnan Province of China (2014)
文摘Evaluation of flotation behavior, solution measurements, and surface analyses were performed to investigate the effects of chloride ion addition on the sulfidization of cerussite in this study. Micro-flotation tests indicate that the addition of chloride ions prior to sulfidization can significantly increase the flotation recovery of cerussite, which is attributed to the formation of more lead sulfide species on the mineral surface. Solution measurement results suggest that the addition of chloride ions prior to sulfidization induces the transformation of more sulfide ions from pulp solution onto the mineral surface by the formation of more lead sulfide species. X-ray diffraction and energy-dispersive spectroscopy indicate that more lead sulfide species form on the mineral surface when chloride ions are added prior to sulfidization. These results demonstrate that the addition of chloride ions prior to sulfidization can significantly improve the sulfidization of cerussite, thereby enhancing the flotation performance.
基金Dr.Xia Li has received two grants from Xijing Hospital(No.XJZT10Y15 and No.XJZT14R15)one grant from the Scientific Department of Shaanxi Province,China(No.2014SF314).
文摘Purpose:Traumatic brain injury(TBI)is one of the leading causes of disability and death in modern times,whose evaluation and prognosis prediction have been one of the most critical issues in TBI management.However,the existed models for the abovementioned purposes were defective to varying degrees.This study aims to establish an ideal brain injury state clinical prediction model(BISCPM).Methods:This study was a retrospective design.The six-month outcomes of patients were selected as the end point event.BISCPM was established by using the split-sample technology,and externally validated via different tests of comparison between the observed and predicted six-month mortality in validating group.TBI patients admitted from July 2006 to June 2012 were recruited and randomly divided into establishing model group and validating model group.Twenty-one scoring indicators were included in BISCPM and divided into three parts,A,B,and C.Part A included movement,pupillary reflex and diameter,CT parameters,and secondary brain insult factors,etc.Part B was age and part C was medical history of the patients.The total score of part A,B and C was final score of BISCPM.Results:Altogether 1156 TBI patients were included with 578 cases in each group.The score of BISCPM from validating group ranged from 2.75 to 31.94,averaging 13.64±5.59.There was not statistical difference between observed and predicted mortality for validating group.The discrimination validation showed that the BISCPM is superior to international mission for prognosis and analysis of clinical trials(IMPACT)lab model.Conclusion:BISCPM is an effective model for state evaluation and prognosis prediction of TBI patients.The use of BISCPM could be of great significance for decision-making in management of TBI.
