The particle residence time distribution(RTD)and axial dispersion coefficient are key parameters for the design and operation of a pressurized circulating fluidized bed(PCFB).In this study,the effects of pressure(0.1-...The particle residence time distribution(RTD)and axial dispersion coefficient are key parameters for the design and operation of a pressurized circulating fluidized bed(PCFB).In this study,the effects of pressure(0.1-0.6 MPa),fluidizing gas velocity(2-7 m·s^(-1)),and solid circulation rate(10-90 kg·m^(-2)·s^(-1))on particle RTD and axial dispersion coefficient in a PCFB are numerically investigated based on the multiphase particle-in-cell(MP-PIC)method.The details of the gas-solid flow behaviors of PCFB are revealed.Based on the gas-solid flow pattern,the particles tend to move more orderly under elevated pressures.With an increase in either fluidizing gas velocity or solid circulation rate,the mean residence time of particles decreases while the axial dispersion coefficient increases.With an increase in pressure,the core-annulus flow is strengthened,which leads to a wider shape of the particle RTD curve and a larger mean particle residence time.The back-mixing of particles increases with increasing pressure,resulting in an increase in the axial dispersion coefficient.展开更多
低代码平台(Low-Code Development Platform,LCDP)是近些年发展起来,敏捷响应企业业务需求迭代发展和支撑企业数字化转型的一项新技术。友好的可视化环境,图形化拖曳式配置操作界面,开发工作的自助化、敏捷化、扁平化,满足了多团队跨地...低代码平台(Low-Code Development Platform,LCDP)是近些年发展起来,敏捷响应企业业务需求迭代发展和支撑企业数字化转型的一项新技术。友好的可视化环境,图形化拖曳式配置操作界面,开发工作的自助化、敏捷化、扁平化,满足了多团队跨地域协作和多种开发形式。越来越多的企业青睐这种无代码或低代码的信息系统开发,既能够敏捷响应业务需求、快速搭建应用系统,又能降低企业开发成本和运维成本。通过低代码平台设计实现基于领域模型驱动的井筒工艺数据采集平台,构建新一代支持云端部署、PC端、移动端等多终端自适应屏幕的应用,弹性伸缩资源调配,提供更稳定、高效的企业级数据采集应用平台,解决数据多系统分散采集、效率低下等问题,为企业数字化转型提供数据要素的支持。展开更多
Objective: The objective of this study was to investigate the relationship between the triglyceride-glucose (TyG) index, triglyceride-glucose-BMI (TyG-BMI) index, laboratory indices, and disease severity in patients w...Objective: The objective of this study was to investigate the relationship between the triglyceride-glucose (TyG) index, triglyceride-glucose-BMI (TyG-BMI) index, laboratory indices, and disease severity in patients with COVID-19. Methods: A retrospective analysis of COVID-19 patients treated at a tertiary hospital in Mianyang City, Sichuan Province, China, from 1 May to 31 May 2023 was performed. The patients were divided into two groups: 66 cases in the moderate group and 61 cases in the severe group. Additionally, 69 uninfected individuals from the medical examination center during the same period were selected as the control group. Spearman rank correlation was used to determine the correlation between the indices and COVID-19 severity. Multiple logistic regression analysis was performed to identify the factors affecting COVID-19 severity. ROC curves were constructed to assess the predictive value of the TyG and TyG-BMI indices for severe COVID-19. Results: There were significant differences in smoking and diabetes between the three groups (P Conclusion: Smoking, AST, ALB, TyG index, and TyG-BMI index are valuable in assessing the severity of COVID-19, with the TyG-BMI index having a higher predictive value than the TyG index.展开更多
基金Financial support of this work by National Natural Science Foundation of China(51976037)。
文摘The particle residence time distribution(RTD)and axial dispersion coefficient are key parameters for the design and operation of a pressurized circulating fluidized bed(PCFB).In this study,the effects of pressure(0.1-0.6 MPa),fluidizing gas velocity(2-7 m·s^(-1)),and solid circulation rate(10-90 kg·m^(-2)·s^(-1))on particle RTD and axial dispersion coefficient in a PCFB are numerically investigated based on the multiphase particle-in-cell(MP-PIC)method.The details of the gas-solid flow behaviors of PCFB are revealed.Based on the gas-solid flow pattern,the particles tend to move more orderly under elevated pressures.With an increase in either fluidizing gas velocity or solid circulation rate,the mean residence time of particles decreases while the axial dispersion coefficient increases.With an increase in pressure,the core-annulus flow is strengthened,which leads to a wider shape of the particle RTD curve and a larger mean particle residence time.The back-mixing of particles increases with increasing pressure,resulting in an increase in the axial dispersion coefficient.
文摘低代码平台(Low-Code Development Platform,LCDP)是近些年发展起来,敏捷响应企业业务需求迭代发展和支撑企业数字化转型的一项新技术。友好的可视化环境,图形化拖曳式配置操作界面,开发工作的自助化、敏捷化、扁平化,满足了多团队跨地域协作和多种开发形式。越来越多的企业青睐这种无代码或低代码的信息系统开发,既能够敏捷响应业务需求、快速搭建应用系统,又能降低企业开发成本和运维成本。通过低代码平台设计实现基于领域模型驱动的井筒工艺数据采集平台,构建新一代支持云端部署、PC端、移动端等多终端自适应屏幕的应用,弹性伸缩资源调配,提供更稳定、高效的企业级数据采集应用平台,解决数据多系统分散采集、效率低下等问题,为企业数字化转型提供数据要素的支持。
文摘Objective: The objective of this study was to investigate the relationship between the triglyceride-glucose (TyG) index, triglyceride-glucose-BMI (TyG-BMI) index, laboratory indices, and disease severity in patients with COVID-19. Methods: A retrospective analysis of COVID-19 patients treated at a tertiary hospital in Mianyang City, Sichuan Province, China, from 1 May to 31 May 2023 was performed. The patients were divided into two groups: 66 cases in the moderate group and 61 cases in the severe group. Additionally, 69 uninfected individuals from the medical examination center during the same period were selected as the control group. Spearman rank correlation was used to determine the correlation between the indices and COVID-19 severity. Multiple logistic regression analysis was performed to identify the factors affecting COVID-19 severity. ROC curves were constructed to assess the predictive value of the TyG and TyG-BMI indices for severe COVID-19. Results: There were significant differences in smoking and diabetes between the three groups (P Conclusion: Smoking, AST, ALB, TyG index, and TyG-BMI index are valuable in assessing the severity of COVID-19, with the TyG-BMI index having a higher predictive value than the TyG index.
