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前倾直挡板搅拌槽叶轮转速对矿浆浓度的影响 被引量:1
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作者 赵晶 刘利宝 王世杰 《机械设计与制造》 北大核心 2019年第6期88-91,共4页
某矿业公司年产百万吨的大型矿浆搅拌槽为研究对象,采用CFD中κ-ε湍流模型和多重参考坐标系法(MRF),对前倾直挡板搅拌槽内的多相流场进行了数值模拟分析,并研究了叶轮转速对搅拌效果的影响。研究结果表明,在搅拌过程中叶轮周围流体会... 某矿业公司年产百万吨的大型矿浆搅拌槽为研究对象,采用CFD中κ-ε湍流模型和多重参考坐标系法(MRF),对前倾直挡板搅拌槽内的多相流场进行了数值模拟分析,并研究了叶轮转速对搅拌效果的影响。研究结果表明,在搅拌过程中叶轮周围流体会形成两个旋转相反的涡流,促进矿浆整体循环,叶轮周围矿浆搅拌剧烈,叶轮边缘流速最大。在搅拌槽结构尺寸、矿浆浓度等相同的条件下,叶轮转速为(30~35)r/min时矿浆搅拌理想混合区(浓度58%~62%)比例较高,达到最优搅拌效果。 展开更多
关键词 大型矿浆搅拌槽 叶轮转速 浓度分布 湍流模型
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大型民用飞机后缘襟翼限位结构设计
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作者 杨其 吴昊 +3 位作者 王明义 刘力搏 刘建刚 陆凯华 《科技视界》 2018年第9期134-135,共2页
本文通过大型民用飞机襟翼与机翼盒段的变形协调分析,研究通过限位的方法对襟翼的变形进行协调控制,以减小机翼盒段和襟翼之间的协调变形载荷,为后续民机设计提供了参考。
关键词 后缘襟翼 运动机构 变形控制
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用CCD成像方法辅助课堂演示实验 被引量:1
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作者 孙正和 刘立宝 +1 位作者 任守田 郭冠军 《物理实验》 2018年第B12期30-32,共3页
介绍了一种CCD成像方法,该方法可以实时地对较小的演示现象成像,并在大屏幕上即时展示出来.该方法可以把较大的演示教具做得较小,更便于制作、携带和存放,同时可以将原来不适合做课堂演示的实验内容扩展到课堂演示内容中,可以增加演示内... 介绍了一种CCD成像方法,该方法可以实时地对较小的演示现象成像,并在大屏幕上即时展示出来.该方法可以把较大的演示教具做得较小,更便于制作、携带和存放,同时可以将原来不适合做课堂演示的实验内容扩展到课堂演示内容中,可以增加演示内容.本文以陀螺演示实验、激光光源测量普朗克常量实验及放大演示结构性演示教具实验为例,详细介绍了CCD成像法的应用. 展开更多
关键词 CCD 成像 演示实验
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Influence of nutritional care during pregnancy on weight control and maternal and infant outcomes in patients with pregnancy-induced hypertension
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作者 liu Xiao-qing liu li-bao YANG Zhu-li 《South China Journal of Cardiology》 CAS 2024年第3期156-161,共6页
Background Preeclampsia is a common disease in pregnant women,characterized by clinical manifestations such as hypertension and proteinuria,which not only seriously affect the safety of pregnant women,but also jeopard... Background Preeclampsia is a common disease in pregnant women,characterized by clinical manifestations such as hypertension and proteinuria,which not only seriously affect the safety of pregnant women,but also jeopardize the safety of the fetus,threatening maternal and infant safety.Currently,in addition to routine hypoglycemic and antihypertensive treatments,auxiliary treatment methods such as exercise and diet are gradually gaining clinical recognition.Therefore,this study aimed to observe the effects of comprehensive nutrition care during pregnancy on weight control during pregnancy and maternal and infant outcomes in patients with pregnancy-induced hypertension syndrome.Methods A total of 100 cases of preeclampsia patients in our hospital from August 2021 to May 2022 were selected and randomly divided into a nutrition group and a conventional group,with 50 cases in each group.The conventional group received routine care,while the nutrition group received additional comprehensive nutrition care during pregnancy based on routine care.The weight control and blood pressure control during pregnancy and maternal and infant outcomes of the two groups were observed.Results The weight control during pregnancy in the nutrition group was significantly better than that in the conventional group(P<0.05).There was no significant difference in systolic and diastolic blood pressure between the two groups before intervention(P>0.05),but both systolic and diastolic blood pressure in both groups were lower after intervention,with the nutrition group significantly lower than the conventional group(P<0.05).The incidence of neonatal asphyxia,placental abruption,postpartum hemorrhage,and cesarean section in the nutrition group was significantly lower than that in the conventional group(P<0.05).Conclusions Comprehensive nutrition care during pregnancy can effectively control weight and blood pressure levels in patients with preeclampsia,and improve maternal and infant outcomes.[S Chin J Cardiol 2024;25(3):156-161] 展开更多
关键词 Comprehensive nutrition care during pregnancy Preeclampsia Weight control during pregnancy Maternal and infant outcomes
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