In this paper, the characteristics of fluid mixing time in a novel extra-loop fluidized bed were studied. The results showed that the mixing time was shortened with the increase of fluid velocity. All the discrete num...In this paper, the characteristics of fluid mixing time in a novel extra-loop fluidized bed were studied. The results showed that the mixing time was shortened with the increase of fluid velocity. All the discrete numbers of the reactor were above 0.2. The serial number n was 2.5 -3.0. It was judged accordingly that the reactor fluid state was continous stirred tank reactor （CSTR） mainly. When the inspiratory capacity increased the mixing time of the reactor was shortened. Thus the air input was beneficial for the fluid mixing. During the three phases mixing process, the mixing time of the reactor could be decreased by the n increase of carrier and air loading together, but the change was not significant. The parameters affecting the reactor fluid state were fluid velocity, inspiratory capacity and carrier. KLa could be increased with the air loading increase, and at the same gas/liquid ratio when the pressure drop was high, KL~ value was increased. The amount of carrier complex influence on KLa. As the carrier loading continued to increase, its value had been dropped but the changes was not significant, and optimization condition was found at above 800 1 000 g carrier loading （pouzzolane） or 600 g PVC. Under gas/liquid ratio of 0.8% -5.2%, KLa was （0.62-1.37）×10^-2· s^-1.展开更多
介绍了辽宁电网安全稳定方面存在的主要问题,辽宁中长期特高压和500 k V电网规划情况及目前辽宁电网分区运行情况。基于搭建的电力系统仿真软件PSD-BPA数据库,计算辽宁电网短路电流水平,针对短路电流超标的地区给出解决方案。结合为降...介绍了辽宁电网安全稳定方面存在的主要问题,辽宁中长期特高压和500 k V电网规划情况及目前辽宁电网分区运行情况。基于搭建的电力系统仿真软件PSD-BPA数据库,计算辽宁电网短路电流水平,针对短路电流超标的地区给出解决方案。结合为降低短路电流水平而实施的线路解环情况,2020年底辽宁电网将形成15个供电分区。就短路电流超标问题,给出了趋势性的建议。展开更多
<em>Objective</em>: To evaluate feasibility of MRI in patients with non-pacemaker (PM)/Implantable cardioverter defibrillator (ICD) metallic devices and abandoned leads. <em>Background</em>: Re...<em>Objective</em>: To evaluate feasibility of MRI in patients with non-pacemaker (PM)/Implantable cardioverter defibrillator (ICD) metallic devices and abandoned leads. <em>Background</em>: Relative safety of MRI performed using specified protocol has been established in MR non-conditional PM/ICDs. With limited safety data, many non-PM/ICD metallic devices and abandoned leads continue to be a contraindication for MRI. <em>Methods</em>: We retrospectively analyzed consecutive patients with extra-cardiac devices, non-programmable cardiac devices, and abandoned leads, who underwent MRI (GE 1.5 Tesla, WI) at a single tertiary care center over a span of 13 years. Scan protocol was designed to maintain specific absorption rate (SAR) < 4.0 W/kg and scan time < 60 minutes. <em>Results</em>: The cohort comprised 127 MRI exams representing 94 patients, with 13 patients having two or more scans. The devices consisted of: 23 vagal nerve stimulators (VNS), 22 implantable loop recorders, 16 spinal stimulators, 5 peripheral nerve stimulators, 3 bladder stimulators, 2 deep brain stimulators, 1 gastric stimulator, 1 bone stimulator, 1 WATCHMAN device, 22 abandoned PM/lCD leads and 1 VNS lead. There was no immediate (peri-MRI exam) morbidity or mortality. Patients did not report any discomfort, palpitations, heating, or sensation of device migration during the exam. Local follow-up data was available in 65% (100% for thoracic imaging) with a mean of 190 ± 475 days (median 13 days). No device malfunction was reported during follow-up. <em>Conclusions</em>: With appropriate precautions, MRI is feasible in patients with extracardiac devices, nonprogrammable cardiac devices, and abandoned leads.展开更多
"十三五"是"外电入鲁"高速发展的时期,山东电网将形成特高压交直流大受端电网,电网结构形态将发生根本性变化。围绕山东电网实际,从特高压交直流落点选择、500 k V网架结构优化、220 k V电网分区、电磁环网开环以..."十三五"是"外电入鲁"高速发展的时期,山东电网将形成特高压交直流大受端电网,电网结构形态将发生根本性变化。围绕山东电网实际,从特高压交直流落点选择、500 k V网架结构优化、220 k V电网分区、电磁环网开环以及大电源接入系统5个方面详细分析了在规划方面山东电网对特高压交直流入鲁后的适应性。分析结果对于优化山东电网网架结构,提高山东电网安全稳定运行能力具有重要意义。展开更多
基金Project supported by the Foundation Social European,Republoque Francaise
文摘In this paper, the characteristics of fluid mixing time in a novel extra-loop fluidized bed were studied. The results showed that the mixing time was shortened with the increase of fluid velocity. All the discrete numbers of the reactor were above 0.2. The serial number n was 2.5 -3.0. It was judged accordingly that the reactor fluid state was continous stirred tank reactor （CSTR） mainly. When the inspiratory capacity increased the mixing time of the reactor was shortened. Thus the air input was beneficial for the fluid mixing. During the three phases mixing process, the mixing time of the reactor could be decreased by the n increase of carrier and air loading together, but the change was not significant. The parameters affecting the reactor fluid state were fluid velocity, inspiratory capacity and carrier. KLa could be increased with the air loading increase, and at the same gas/liquid ratio when the pressure drop was high, KL~ value was increased. The amount of carrier complex influence on KLa. As the carrier loading continued to increase, its value had been dropped but the changes was not significant, and optimization condition was found at above 800 1 000 g carrier loading （pouzzolane） or 600 g PVC. Under gas/liquid ratio of 0.8% -5.2%, KLa was （0.62-1.37）×10^-2· s^-1.
文摘介绍了辽宁电网安全稳定方面存在的主要问题,辽宁中长期特高压和500 k V电网规划情况及目前辽宁电网分区运行情况。基于搭建的电力系统仿真软件PSD-BPA数据库,计算辽宁电网短路电流水平,针对短路电流超标的地区给出解决方案。结合为降低短路电流水平而实施的线路解环情况,2020年底辽宁电网将形成15个供电分区。就短路电流超标问题,给出了趋势性的建议。
文摘<em>Objective</em>: To evaluate feasibility of MRI in patients with non-pacemaker (PM)/Implantable cardioverter defibrillator (ICD) metallic devices and abandoned leads. <em>Background</em>: Relative safety of MRI performed using specified protocol has been established in MR non-conditional PM/ICDs. With limited safety data, many non-PM/ICD metallic devices and abandoned leads continue to be a contraindication for MRI. <em>Methods</em>: We retrospectively analyzed consecutive patients with extra-cardiac devices, non-programmable cardiac devices, and abandoned leads, who underwent MRI (GE 1.5 Tesla, WI) at a single tertiary care center over a span of 13 years. Scan protocol was designed to maintain specific absorption rate (SAR) < 4.0 W/kg and scan time < 60 minutes. <em>Results</em>: The cohort comprised 127 MRI exams representing 94 patients, with 13 patients having two or more scans. The devices consisted of: 23 vagal nerve stimulators (VNS), 22 implantable loop recorders, 16 spinal stimulators, 5 peripheral nerve stimulators, 3 bladder stimulators, 2 deep brain stimulators, 1 gastric stimulator, 1 bone stimulator, 1 WATCHMAN device, 22 abandoned PM/lCD leads and 1 VNS lead. There was no immediate (peri-MRI exam) morbidity or mortality. Patients did not report any discomfort, palpitations, heating, or sensation of device migration during the exam. Local follow-up data was available in 65% (100% for thoracic imaging) with a mean of 190 ± 475 days (median 13 days). No device malfunction was reported during follow-up. <em>Conclusions</em>: With appropriate precautions, MRI is feasible in patients with extracardiac devices, nonprogrammable cardiac devices, and abandoned leads.
文摘"十三五"是"外电入鲁"高速发展的时期,山东电网将形成特高压交直流大受端电网,电网结构形态将发生根本性变化。围绕山东电网实际,从特高压交直流落点选择、500 k V网架结构优化、220 k V电网分区、电磁环网开环以及大电源接入系统5个方面详细分析了在规划方面山东电网对特高压交直流入鲁后的适应性。分析结果对于优化山东电网网架结构,提高山东电网安全稳定运行能力具有重要意义。
