外循环撞击流反应器混和时间实验研究

在容积为160L的冷模装置上,以水为介质、KCl水溶液为示踪剂,测定了外循环撞击流反应器（ECISR）的混和时间,采用正交试验法和单因素试验法考察了撞击段结构、进料位置、循环位置、循环流量对ECISR混和时间的影响。结果表明：实验范围内,循环位置对混和时间影响最大,进料位置次之,循环流量越大混和时间越短,撞击段结构Ⅰ的混和时间略低于结构Ⅱ。     

Nurses’ Perceptions of a Novel Health Information Technology: A Qualitative Study in the Pediatric Intensive Care Unit

ABSTRACT

The purpose of this study was to evaluate the use of a novel health information technology (HIT), a large customizable interactive monitor (LCIM), implemented in a pediatric intensive care unit (PICU). Specifically, we explored nurses’ perceptions of this novel HIT application and its perceived effect on family engagement. We used a qualitative research design to collect and analyze data from 55 PICU nurses in seven focus groups. A trained moderator followed a semi-structured discussion guide with questions related to perceptions, attitudes, and care team interactions with the LCIM. Groups were audio-recorded, transcribed, and coded using content analysis procedure. Six major themes emerged from the nurse focus groups, which include familiarity and use routines, positive perceptions with the LCIM, negative perceptions with the LCIM, privacy, training, and suggestions for improvement. Insights into nurses’ perceptions of the LCIM have the potential to improve family-centered care.     

Investigation on some Schiff bases as corrosion inhibitors for mild steel

In the present work, the effect of some newly synthesized Schiff bases containing sulphur nitrogen as heteroatom was investigated on mild steel corrosion in acidic media. Electrochemical studies of the mild steel samples were performed in an aerated solution of 0.1 M HCl + dimethyl sulphoxide (DMS) as co-solvent. DMS is also behaving as a corrosion inhibitor for mild steel. At low inhibitor concentration and short immersion time one can see only the inhibitive effect of DMS as anodic inhibitor for mild steel. At high concentration and long immersion time inhibition efficiencies are increased and cathodic inhibition is observed.     

草甘膦节能干燥技术的研究与开发

分析计算了内加热对流化床干燥过程热效率的影响。实验测定了草甘膦流化床干燥机中内加热传热系数,设计开发了用于草甘膦干燥的内加热流化床干燥机,并与普通流化床干燥机和气流干燥机进行了分析对比。     

化学工程与工艺专业人才培养模式改革的探索与实践

本文回顾了化学工程与工艺专业的历史变革,展望了化工高等教育的发展趋势。为了适应经济社会发展的要求,解决目前化学工程与工艺专业人才培养过程中存在的问题,浙江工业大学化学工程与材料学院从拓展专业外延和内涵、变革课程体系,加强创新实践教学环节和构建优良育人环境等方面对现有的化工教育模式进行研究和改革探索,并已取得较好的效果。     

两段节流蒸发两段压缩热泵干燥装置模拟分析

为提高干燥后期干燥速率、降低能耗,提出了两段节流蒸发两段压缩热泵干燥装置的构想。模拟分析了以R134a为热泵工质、采用卧式流化床干燥机时,蒸发器1中工质蒸发温度te1、蒸发器2中工质蒸发温度te2、冷凝温度tc、两股空气质量流量比r(q1/q2)对制热系数COPH、除湿能耗比SMER的影响规律。结果表明:r=1,tc1=75℃,te2=15℃时,te1由15℃提高到25℃,COPH值由2.40提高到2.75,SMER由1.46 kg/(kW·h)提高到1.82 kg/(kW·h);tc1=75℃,te1=25℃,te2=15℃时,r由0.5提高到3.0时,COPH值由2.44提高到2.62,SMER由1.26 kg/(kW·h)提高到1.96 kg/(kW·h);在模拟条件范围内的COPH为2.40-3.01,SMER为0.89~1.96 kg/(kW·h)。     

多层三相流化床流动特性的研究

针对多层三相流化床进行冷模试验,以饱和KCl溶液为示踪剂,采用电导法测定不同液速、气速和固相浓度条件下液相流体在床内的停留时间分布曲线、平均停留时间。采用多釜串联模型得到模拟参数以及其返混特性随着各操作参数变化的情况。结果表明：液相速度对平均停留时间影响显著,随液速增大而急剧减小;气速和载体对平均停留时间影响较小,随着气速和载体量增加平均停留时间均呈下降趋势。液相返混程度随气相速度增加而增加,随液相速度和载体含量的增加而减小。     

下喷式环流反应器液相流动特性研究

液相停留时间分布分析用于下喷式环流反应器导流筒顶部区域、底部区域、环隙流体流动特性研究。分别将轴向扩散模型应用到各个区域,实验结果表明轴向扩散模型能较好的预测反应器内流体的停留时间分布。采用最小二乘法拟合实验响应曲线,得到模型方程参数。结果表明各个部分的Pe值均随液体喷射速度的增大而减小。导流筒顶部区域的Pe值变化范围为:25.4~6.6;导流筒底部区域的Pe值变化范围为:45.4~11.6;环隙的Pe值变化范围为:60.0~39.2。结果表明导流筒顶部区域返混最大,环隙区域接近于平推流。反应器混和时间随液体喷射速度的增大而减小,变化范围为:88.3~12.5 s。