The electrokinetic characteristics and coagulation behaviors of polyaluminum silicate chloride (PASiC) and polyaluminum chloride (PAC) were studied and compared by streaming current (SC) measurement and jar test metho...The electrokinetic characteristics and coagulation behaviors of polyaluminum silicate chloride (PASiC) and polyaluminum chloride (PAC) were studied and compared by streaming current (SC) measurement and jar test method. The experimental results showed that the interaction between polysilicic acid characterized negative charge and hydrolyzed aluminum species result in a decrease of the charge neutralizing ability of PASiC, compared to PAC. The decrease has a close relationship with the basicity ( B ) and Al/Si molar ratio in PASiC. The less the B value and the Al/Si molar ratio, the lower the charge neutralizing ability of PASiC is. In contrast, the preparation technique for PASiC affects the charge-neutralization of PASiC to a smaller extent. In addition, compared with PAC, PASiC may enhance aggregating efficiency and give better coagulating effects.展开更多
The aim of this research is to propose an innovative technique of the psychological autopsy.Compared to the classic MAPI model,our procedure is structured on each single case by adapting the interview to the environme...The aim of this research is to propose an innovative technique of the psychological autopsy.Compared to the classic MAPI model,our procedure is structured on each single case by adapting the interview to the environmental circumstances,the socio-cultural characteristics of the subject examined and to the weapon used in the criminal act.We believe that this approach improves both confidence and compliance of the interviewee and the chances of obtaining information that could escape a standardized investigation.In one of the cold cases we studied,this new protocol led to the discovery of biological material coming from the crime scene,which had been secretly hidden by the subject for over 50 years.The aim of our work was also to coordinate the activity of the interviewer,trying to avoid repetition in the interviews that could lead to an alteration of the answers to the questions asked.In the first phase,questions with open-ended responses were preferred.In later stages,we asked specifically worded questions.We were careful not to formulate questions that had already been asked.It must be emphasized that for each case of psychological autopsy only one operator handled the interview.展开更多
文摘The electrokinetic characteristics and coagulation behaviors of polyaluminum silicate chloride (PASiC) and polyaluminum chloride (PAC) were studied and compared by streaming current (SC) measurement and jar test method. The experimental results showed that the interaction between polysilicic acid characterized negative charge and hydrolyzed aluminum species result in a decrease of the charge neutralizing ability of PASiC, compared to PAC. The decrease has a close relationship with the basicity ( B ) and Al/Si molar ratio in PASiC. The less the B value and the Al/Si molar ratio, the lower the charge neutralizing ability of PASiC is. In contrast, the preparation technique for PASiC affects the charge-neutralization of PASiC to a smaller extent. In addition, compared with PAC, PASiC may enhance aggregating efficiency and give better coagulating effects.
文摘The aim of this research is to propose an innovative technique of the psychological autopsy.Compared to the classic MAPI model,our procedure is structured on each single case by adapting the interview to the environmental circumstances,the socio-cultural characteristics of the subject examined and to the weapon used in the criminal act.We believe that this approach improves both confidence and compliance of the interviewee and the chances of obtaining information that could escape a standardized investigation.In one of the cold cases we studied,this new protocol led to the discovery of biological material coming from the crime scene,which had been secretly hidden by the subject for over 50 years.The aim of our work was also to coordinate the activity of the interviewer,trying to avoid repetition in the interviews that could lead to an alteration of the answers to the questions asked.In the first phase,questions with open-ended responses were preferred.In later stages,we asked specifically worded questions.We were careful not to formulate questions that had already been asked.It must be emphasized that for each case of psychological autopsy only one operator handled the interview.
