The Experts below are selected from a list of 9207 Experts worldwide ranked by ideXlab platform
Jaka Sunarso - One of the best experts on this subject based on the ideXlab platform.
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CO2‐resistant SDC‐SSAF oxygen selective dual‐phase hollow fiber membranes
Asia-Pacific Journal of Chemical Engineering, 2020Co-Authors: Shude Zhang, Jaka Sunarso, Xiuxia Meng, Xiaoyao Tan, Zhonghua Zhu, Shaomin LiuAbstract:CeSmO–SmSrAlFeO (SDC-SSAF) hollow fiber membranes aimed for oxyfuel application are fabricated via a phase inversion-sintering technique using powders synthesized from EDTA–citrate complex method. Oxygen ions transport is revealed to be the limiting step that determines the overall oxygen transport rate in SDC-SSAF. SDC-SSAF hollow fiber membrane attained a maximum flux of 2.6 ml min cm at 950°C under an oxygen Partial Pressure Difference of 1/0.02 atm (feed/permeate). Variation in oxygen Partial Pressure on the permeate side exerts larger influence on the oxygen permeation flux relative to the change on the feed side. Stability tests over 100 h demonstrate stable oxygen permeation flux under both He and CO sweep conditions.
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rate determining step in sdc ssaf dual phase oxygen permeation membrane
Journal of Membrane Science, 2019Co-Authors: Claudia Li, Wenping Li, Jiuan Jing Chew, Jaka SunarsoAbstract:Abstract Dense mixed ionic-electronic conducting (MIEC) dual-phase Ce0.85Sm0.15O1.925–Sm0.6Sr0.4Al0.3Fe0.7O3-δ (SDC-SSAF) represents one of the most attractive oxygen-selective membrane materials for oxygen separation from air above 700 °C. Its high phase stability in reducing atmosphere and CO2 resistance allows its potential direct integration into oxyfuel combustion and membrane reactor applications. In this work, the oxygen permeation parameters and properties of SDC-SSAF are evaluated theoretically using the Zhu model, which analyses the role of interfaces in electrochemical oxygen permeation. The model produced good correlation with the experimental data (R2 = 0.9990), with the calculated resistance constants indicating higher resistance encountered at the feed side interface as compared to the permeate side. An analysis of the characteristic thickness indicates increasing influence of surface exchange reactions with decreasing temperature, feed side Pressure, and permeate side Pressure. Although oxygen permeation is dependent upon various operating conditions, our parametric study reveals that temperature effect surpasses oxygen Partial Pressure Difference effect in enhancing the oxygen permeation flux. Oxygen permeation is limited by surface reactions between 800 and 850 °C and mixed bulk diffusion and surface exchange reactions between 850 and 875 °C. Above 875 °C, the rate determining step shifts to bulk diffusion.
Claudia Li - One of the best experts on this subject based on the ideXlab platform.
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rate determining step in sdc ssaf dual phase oxygen permeation membrane
Journal of Membrane Science, 2019Co-Authors: Claudia Li, Wenping Li, Jiuan Jing Chew, Jaka SunarsoAbstract:Abstract Dense mixed ionic-electronic conducting (MIEC) dual-phase Ce0.85Sm0.15O1.925–Sm0.6Sr0.4Al0.3Fe0.7O3-δ (SDC-SSAF) represents one of the most attractive oxygen-selective membrane materials for oxygen separation from air above 700 °C. Its high phase stability in reducing atmosphere and CO2 resistance allows its potential direct integration into oxyfuel combustion and membrane reactor applications. In this work, the oxygen permeation parameters and properties of SDC-SSAF are evaluated theoretically using the Zhu model, which analyses the role of interfaces in electrochemical oxygen permeation. The model produced good correlation with the experimental data (R2 = 0.9990), with the calculated resistance constants indicating higher resistance encountered at the feed side interface as compared to the permeate side. An analysis of the characteristic thickness indicates increasing influence of surface exchange reactions with decreasing temperature, feed side Pressure, and permeate side Pressure. Although oxygen permeation is dependent upon various operating conditions, our parametric study reveals that temperature effect surpasses oxygen Partial Pressure Difference effect in enhancing the oxygen permeation flux. Oxygen permeation is limited by surface reactions between 800 and 850 °C and mixed bulk diffusion and surface exchange reactions between 850 and 875 °C. Above 875 °C, the rate determining step shifts to bulk diffusion.
Nipon Chattipakorn - One of the best experts on this subject based on the ideXlab platform.
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the role of central venous oxygen saturation blood lactate and central venous to arterial carbon dioxide Partial Pressure Difference as a goal and prognosis of sepsis treatment
Journal of Critical Care, 2016Co-Authors: Borwon Wittayachamnankul, Boriboon Chentanakij, Kamphee Sruamsiri, Nipon ChattipakornAbstract:Abstract Objective The current practice in treatment of severe sepsis and septic shock is to ensure adequate oxygenation and perfusion in patients, along with prompt administration of antibiotics, within 6 hours from diagnosis, which is considered the “golden hour” for the patients. One of the goals of treatment is to restore normal tissue perfusion. With this goal in mind, some parameters have been used to determine the success of treatment and mortality rate; however, none has been proven to be the best predictor of mortality rate in sepsis patients. Despite growing evidence regarding the prognostic indicators for mortality in sepsis patients, inconsistent reports exist. Study selection This review comprehensively summarizes the reports regarding the frequently used parameters in sepsis including central venous oxygen saturation, blood lactate, and central venous-to-arterial carbon dioxide Partial Pressure Difference, as prognostic indicators for clinical outcomes in sepsis patients. Moreover, consistent findings and inconsistent reports for their pathophysiology and the potential mechanisms for their use as well as their limitations in sepsis patients are presented and discussed. Finally, a schematic strategy for potential management and benefits in sepsis patients is proposed based upon these current available data. Conclusion There is currently no ideal biomarker that can indicate prognosis, predict progression of the disease, and guide treatment in sepsis. Further studies are needed to be carried out to identify the ideal biomarker that has all the desired properties.
Frederick A. Burrows - One of the best experts on this subject based on the ideXlab platform.
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Stability of the intra-operative arterial to end-tidal carbon dioxide Partial Pressure Difference in children with congenital heart disease
Canadian Journal of Anaesthesia-journal Canadien D Anesthesie, 1991Co-Authors: Valerie A. Lazzell, Frederick A. BurrowsAbstract:The purpose of this study was to evaluate the stability of the arterial PCO2 (PaCO2) to end-tidal PCO2 (PetCO2) Partial Pressure Difference (Pa-etCO2) during surgery usingPetCO2 monitoring, in children with congenital heart disease (CHD). Forty children with CHD were studied: ten children with no interchamber communication and normal pulmonary blood flow (PBF) (normal group); ten acyanotic children with increased PBF (acyanotic-shunting group); ten cyanotic children with mixing type lesions and normal or increased PBF (mixing group), and ten cyanotic children with right-to-left intracardiac shunts demonstrating decreased and variable PBF (cyanotic-shunting group). Simultaneous PaCO2 recordings andPetCO2 measurements were obtained for each patient during five intraoperative events: (1) control time, arterial line placement under anaesthesia; (2) time 1, patient preparation; (3) time 2, immediately after sternotomy; (4) time 3, after heparin administration; and (5) time 4, immediately after aortic cannulation. Initially, cyanotic children demonstrated a greater Pa-etCO2 compared with acyanotic children (P
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stability of the intra operative arterial to end tidal carbon dioxide Partial Pressure Difference in children with congenital heart disease
Canadian Journal of Anaesthesia-journal Canadien D Anesthesie, 1991Co-Authors: Valerie A. Lazzell, Frederick A. BurrowsAbstract:The purpose of this study was to evaluate the stability of the arterial PCO2 (PaCO2) to end-tidal PCO2 (PetCO2) Partial Pressure Difference (Pa-etCO2) during surgery usingPetCO2 monitoring, in children with congenital heart disease (CHD). Forty children with CHD were studied: ten children with no interchamber communication and normal pulmonary blood flow (PBF) (normal group); ten acyanotic children with increased PBF (acyanotic-shunting group); ten cyanotic children with mixing type lesions and normal or increased PBF (mixing group), and ten cyanotic children with right-to-left intracardiac shunts demonstrating decreased and variable PBF (cyanotic-shunting group). Simultaneous PaCO2 recordings andPetCO2 measurements were obtained for each patient during five intraoperative events: (1) control time, arterial line placement under anaesthesia; (2) time 1, patient preparation; (3) time 2, immediately after sternotomy; (4) time 3, after heparin administration; and (5) time 4, immediately after aortic cannulation. Initially, cyanotic children demonstrated a greater Pa-etCO2 compared with acyanotic children (P<0.05). There was no Difference in the Pa-etCO2 over time in the control, acyanotic-shunting, or mixing groups. The Pa-etCO2 in the children with cyanotic-shunting lesions at times 2 and 3 was greater (P<0.05) than at their control times. We conclude that the Pa-etCO2 of children with acyanotic-shunting and mixing congenital heart lesions is stable intraoperatively, although patients with mixing congenital heart lesions may demonstrate large individual variations. In children with cyanotic-shunting congenital heart lesions, the Pa-etCO2 is not stable. ThePetCO2 cannot be used during surgery to estimate reliably the PaCO2 in children with cyanotic CHD.
Jiuan Jing Chew - One of the best experts on this subject based on the ideXlab platform.
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rate determining step in sdc ssaf dual phase oxygen permeation membrane
Journal of Membrane Science, 2019Co-Authors: Claudia Li, Wenping Li, Jiuan Jing Chew, Jaka SunarsoAbstract:Abstract Dense mixed ionic-electronic conducting (MIEC) dual-phase Ce0.85Sm0.15O1.925–Sm0.6Sr0.4Al0.3Fe0.7O3-δ (SDC-SSAF) represents one of the most attractive oxygen-selective membrane materials for oxygen separation from air above 700 °C. Its high phase stability in reducing atmosphere and CO2 resistance allows its potential direct integration into oxyfuel combustion and membrane reactor applications. In this work, the oxygen permeation parameters and properties of SDC-SSAF are evaluated theoretically using the Zhu model, which analyses the role of interfaces in electrochemical oxygen permeation. The model produced good correlation with the experimental data (R2 = 0.9990), with the calculated resistance constants indicating higher resistance encountered at the feed side interface as compared to the permeate side. An analysis of the characteristic thickness indicates increasing influence of surface exchange reactions with decreasing temperature, feed side Pressure, and permeate side Pressure. Although oxygen permeation is dependent upon various operating conditions, our parametric study reveals that temperature effect surpasses oxygen Partial Pressure Difference effect in enhancing the oxygen permeation flux. Oxygen permeation is limited by surface reactions between 800 and 850 °C and mixed bulk diffusion and surface exchange reactions between 850 and 875 °C. Above 875 °C, the rate determining step shifts to bulk diffusion.