The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform
Datu Rizal - One of the best experts on this subject based on the ideXlab platform.
-
safety and reliability analysis in a polyvinyl chloride batch process using dynamic simulator case study loss of Containment Incident
Journal of Hazardous Materials, 2006Co-Authors: Datu Rizal, Shinichi Tani, Kimitoshi Nishiyama, Kazuhiko SuzukiAbstract:In this paper, a novel methodology in batch plant safety and reliability analysis is proposed using a dynamic simulator. A batch process involving several safety objects (e.g. sensors, controller, valves, etc.) is activated during the operational stage. The performance of the safety objects is evaluated by the dynamic simulation and a fault propagation model is generated. By using the fault propagation model, an improved fault tree analysis (FTA) method using switching signal mode (SSM) is developed for estimating the probability of failures. The timely dependent failures can be considered as unavailability of safety objects that can cause the accidents in a plant. Finally, the rank of safety object is formulated as performance index (PI) and can be estimated using the importance measures. PI shows the prioritization of safety objects that should be investigated for safety improvement program in the plants. The output of this method can be used for optimal policy in safety object improvement and maintenance. The dynamic simulator was constructed using Visual Modeler (VM, the plant simulator, developed by Omega Simulation Corp., Japan). A case study is focused on the loss of Containment (LOC) Incident at polyvinyl chloride (PVC) batch process which is consumed the hazardous material, vinyl chloride monomer (VCM).
Kazuhiko Suzuki - One of the best experts on this subject based on the ideXlab platform.
-
safety and reliability analysis in a polyvinyl chloride batch process using dynamic simulator case study loss of Containment Incident
Journal of Hazardous Materials, 2006Co-Authors: Datu Rizal, Shinichi Tani, Kimitoshi Nishiyama, Kazuhiko SuzukiAbstract:In this paper, a novel methodology in batch plant safety and reliability analysis is proposed using a dynamic simulator. A batch process involving several safety objects (e.g. sensors, controller, valves, etc.) is activated during the operational stage. The performance of the safety objects is evaluated by the dynamic simulation and a fault propagation model is generated. By using the fault propagation model, an improved fault tree analysis (FTA) method using switching signal mode (SSM) is developed for estimating the probability of failures. The timely dependent failures can be considered as unavailability of safety objects that can cause the accidents in a plant. Finally, the rank of safety object is formulated as performance index (PI) and can be estimated using the importance measures. PI shows the prioritization of safety objects that should be investigated for safety improvement program in the plants. The output of this method can be used for optimal policy in safety object improvement and maintenance. The dynamic simulator was constructed using Visual Modeler (VM, the plant simulator, developed by Omega Simulation Corp., Japan). A case study is focused on the loss of Containment (LOC) Incident at polyvinyl chloride (PVC) batch process which is consumed the hazardous material, vinyl chloride monomer (VCM).
Michael Bruno - One of the best experts on this subject based on the ideXlab platform.
-
Development of Improved Caprock Integrity and Risk Assessment Techniques
2014Co-Authors: Michael BrunoAbstract:GeoMechanics Technologies has completed a geomechanical caprock integrity analysis and risk assessment study funded through the US Department of Energy. The project included: a detailed review of historical caprock integrity problems experienced in the natural gas storage industry; a theoretical description and documentation of caprock integrity issues; advanced coupled transport flow modelling and geomechanical simulation of three large-scale potential geologic sequestration sites to estimate geomechanical effects from CO₂ injection; development of a quantitative risk and decision analysis tool to assess caprock integrity risks; and, ultimately the development of recommendations and guidelines for caprock characterization and CO₂ injection operating practices. Historical data from gas storage operations and CO₂ sequestration projects suggest that leakage and Containment Incident risks are on the order of 10-1 to 10-2, which is higher risk than some previous studies have suggested for CO₂. Geomechanical analysis, as described herein, can be applied to quantify risks and to provide operating guidelines to reduce risks. The risk assessment tool developed for this project has been applied to five areas: The Wilmington Graben offshore Southern California, Kevin Dome in Montana, the Louden Field in Illinois, the Sleipner CO₂ sequestration operation in the North Sea, and the In Salah CO₂ sequestration operationmore » in North Africa. Of these five, the Wilmington Graben area represents the highest relative risk while the Kevin Dome area represents the lowest relative risk.« less
Ellen Van Der Veer - One of the best experts on this subject based on the ideXlab platform.
-
Development of Improved caprock Integrity Analysis and Risk Assessment Techniques
Energy Procedia, 2020Co-Authors: Michael S. Bruno, Julia Diessl, Bill Childers, Jing Xiang, Nicky White, Ellen Van Der VeerAbstract:Abstract GeoMechanics Technologies has completed a geomechanical caprock integrity analysis and risk assessment study funded through the US Department of Energy. The project included: a detailed review of historical caprock integrity problems experienced in the natural gas storage industry; advanced coupled transport flow modelling and geomechanical simulation of three large-scale potential geologic sequestration sites to estimate geomechanical effects from large-scale CO2 injection; and development of a quantitative risk and decision analysis tool to assess caprock integrity risks. Historical data from gas storage operations and CO2 sequestration projects suggest that leakage and Containment Incident risks are on the order of 10-1 to 10-2, which is higher risk than some previous studies have suggested for CO2. Geomechanical analysis, as described herein, can be applied to quantify risks and to provide operating guidelines to reduce risks. The risk assessment tool developed for this project has been applied to five areas: The Wilmington Graben offshore Southern California, Kevin Dome in Montana, the Louden Field in Illinois, the Sleipner CO2 sequestration operation in the North Sea, and the In Salah CO2 sequestration operation in North Africa. Of these five, the Wilmington Graben setting represent the highest relative risk while the Kevin Dome setting represents the lowest relative risk.
Rahul Jalil - One of the best experts on this subject based on the ideXlab platform.
-
Anger: Its Role and Relation to Aggression and Coercive Containment in Secure Adult Mental Health Services
2020Co-Authors: Rahul JalilAbstract:BACKGROUND: Inpatient aggression is common in mental health services resulting in significant costs. Anger is an important risk factor, but research into the role of its constituents is limited. The role of nursing staff's anger in their reactions to aggressive patients is poorly understood. AIMS: This thesis examined the role of anger and its components in patient aggression and nursing staff’s coercive Containment practices. Objectives were to: i) better understand the relationship between patient anger and aggression; ii) identify whether patients’ self-reported anger adds value to violence-risk assessment tools; iii) determine whether nursing staff anger is related to exposure to inpatient aggression and in their attitudes towards and involvement in coercive Containment; iv) determine how anger is manifested in the interpersonal styles of both patients and nursing staff, and identify whether any specific nurse-patient interpersonal relationship-type is associated with inpatient aggression and/or coercive Containment. METHODS: Two systematic literature reviews were conducted on patient anger and nursing staff anger, respectively. Correlational study designs were adopted across four empirical studies using validated questionnaires and cognitive tasks. Aggression and Containment Incident data and clinician-rated violence risk assessments were retrieved. RESULTS: Patients (n = 93) and nursing staff (n = 68) from low and medium secure mental health services were recruited. Using explicit cognitive processing measures, patient anger was associated with hostility and rumination tendencies. Patients’ selfreported anger was significantly positively correlated with clinician-rated, anger-related violence risk assessment items, and predicted inpatient aggression but not beyond clinicians’ ratings. Nursing staff anger was associated with exposure to patient aggression perceived as humiliating; nursing staff who reported higher levels of anger approved more of physical restraint. Patients’ self-reported anger was related to their nurse-rated hostile interpersonal style while nurses’ self-reported anger was related to their patient-rated dominant interpersonal style. CONCLUSIONS: Implications of this programme of research demonstrates that anger plays an important role in the occurrence and management of inpatient aggression. They provide significant new knowledge to incorporate into evidence-based anger treatment programmes and staff training and support.
-
The role of interpersonal style in aggression and its Containment in a forensic mental health setting: A correlational and pseudoprospective study of patients and nursing staff
International Journal of Mental Health Nursing, 2019Co-Authors: Rahul Jalil, Jorg Huber, Judith Sixsmith, Geoffrey L. DickensAbstract:Inpatient aggression on mental health wards is common and staff-patient interactions are frequently reported antecedents to aggression. However, relatively little is known about the precise relationship between aggression and these interactions, or their relationships with aggression and staff Containment responses such as restraint and seclusion. This study aimed to determine the roles of anger and interpersonal style among mental health nurses and between nurses and patients in the occurrence of aggression and its Containment. A correlational, pseudo-prospective study design was employed. n=85 inpatients and n=65 nurses were recruited from adult, low- and medium- secure wards of a secure forensic mental health service. Participants completed validated self-report anger and transactional interpersonal style measures. Inpatient aggression and Containment Incident data for a 3-month follow-up period were extracted from clinical records. Dyadic nurse-patient relationships were anti-complementary. Patients’ self-reported anger and staff-rated hostile interpersonal style were significantly positively correlated; staff self-reported anger and patient-rated dominant interpersonal style were also positively correlated. Patient anger predicted aggression and their interpersonal style predicted being subject to Containment in the form of restraint and seclusion. There were no statistically significant differences identified on measures between staff who were and were not involved in Containment. More targeted intervention for patients’ anger may have a positive impact on interpersonal style and lead to the reduction of Incidents. Staff education and skills training programmes should emphasise the importance of interpersonal styles which could help to promote and enhance positive interactions