38 research outputs found
燃气热泵(GHP)系统热泵运行时的数值模拟研究
通过建立天然气发动机驱动热泵系统的数学模型,研究了供热工况下,点火提前角、压缩比、过量空气系数、发动机转速等参数对天然气发动机及整个热泵系统运行性能的影响,为天然气发动机的优化设计提供一定的理论依据,并且预测了燃气热泵的性能,证明了该系统具有较好的部分负荷特性
对滚式齿轮纵扭复合超声滚压系统设计与分析
为解决目前齿轮超声滚压强化因设备的限制及振动的单一性导致强化效率低、作用范围小等问题,提出了一种新的对滚式齿轮纵扭复合超声滚压系统,包括纵扭复合变幅杆及与之匹配的工具齿轮。基于理论计算的方法推导出圆锥形复合变幅杆频率方程,求得相关设计参数。在圆锥段开螺旋槽并装配齿轮,利用有限元分析方法研究纵扭复合振动、计算齿面处纵扭复合振动位移及轨迹。采用单因素变量法及有限元分析方法并引入参数扭纵振比,研究槽数、槽深、槽宽、螺旋角等不同螺旋槽参数对纵扭复合超声振动的影响规律,得到最优的参数组合,采用轻量化方法设计出工具齿轮。结果证明,纵扭复合变幅杆设计满足要求,齿轮轻量化设计并装配后得到有效纵扭复合振动。在圆锥形复合变幅杆圆锥段开槽可产生纵扭复合振动,扭转振动效果主要与螺旋槽槽数、槽深、槽宽、螺旋角等参数相关;与工具齿轮装配得到对滚式齿轮纵扭复合超声滚压系统,为新的齿轮纵扭复合超声滚压装置工作性能达成提供了技术支撑
Hydrodeoxygenation of vanillin catalyzed by molybdenum carbide supported on activated carbon(以活性炭为载体的碳化钼催化剂在香兰素加氢脱氧反应中的作用)
XRD,TEM,N2-吸附等表征手段表明,在700 ℃下以碳热氢还原方法制备的粒径在1~4 nm的β-Mo2C,能够均匀分散在活性炭载体上.在温和条件(100 ℃,氢压1.0 MPa, 3 h)下,以水作为反应溶剂,质量分数为20.0%的Mo2C/AC催化剂催化香兰素的加氢脱氧反应转化率高达93.2%,2-甲氧基-4-甲基苯酚的选择性达到53.8%.随着负载量的增加,Mo2C/AC催化剂的比表面积呈下降趋势,其活性先增强后减弱,而当负载量增加到一定程度后,Mo2C粒子在载体上发生团聚,导致催化活性大幅度降低.根据原料和产物浓度随时间的变化曲线,提出加氢脱氧反应以香兰醇作为中间产物,经过2步加氢步骤生成2-甲氧基4-甲基苯酚,且第1步加氢反应速率大于第2步.使用多次后,Mo2C/AC催化剂的催化活性几乎不变,说明其具有工业应用前景
燃气热泵(GHP)系统制冷工况的数值模拟与分析
通过建立天然气发动机驱动热泵系统的数学模型,研究了制冷工况下,点火提前角、压缩比、过量空气系数、发动机转速等参数对天然气发动机及整个热泵系统运行性能的影响,为天然气发动机的优化设计提供一定的理论依据,并且预测了燃气热泵的性能,证明了该系统具有较好的部分负荷特性
一例白鲸应激反应综合症的病例报道
本文就一例幼年雌性白鲸在运输后发生的应激反应综合症进行了诊断、治疗。临床表现为精神不振、拒食、体重下降、体色暗淡、巩膜及结膜充血、皮肤瘙痒;血液学检查表明轻度贫血和脱水、肌肉炎症及胃炎。后进行综合措施调整后,4d后恢复采食,2周后康复。同类鲸的疾病研究国内文献未见报道
基于P2P技术的CSRe冷却装置控制系统设计;Design of Control System for CSRe Cooling Equipment Based on P2P Technology
HIRFL-CSR工程对CSRe冷却装置电子冷却部分的控制系统在实时性和可靠性方面提出了非常高的要求。电子冷却工作环境复杂,各种干扰难以预测。从电子冷却的控制系统改进出发,以实现电子冷却的自动调束为目标,以高端FPGA和ARM嵌入式系统为基础,采用P2P通讯技术和神经元网络算法来实现对电子冷却的自动控制。该控制系统对电子冷却控制的完善提供了先进的硬件平台和软件实现方案
己内酰胺在硫酸铵晶体表面吸附特性
In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide(CPB),dodecyltrimethylammonium bromide(DTAB),non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate(SDS)and sodium dodecyl benzene sulfonate(SDBS)increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases
己内酰胺在硫酸铵晶体表面吸附特性
In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide(CPB),dodecyltrimethylammonium bromide(DTAB),non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate(SDS)and sodium dodecyl benzene sulfonate(SDBS)increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases
己内酰胺在硫酸铵晶体表面吸附特性
In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide(CPB),dodecyltrimethylammonium bromide(DTAB),non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate(SDS)and sodium dodecyl benzene sulfonate(SDBS)increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases
