Ne-N2O复合物超声分子束中红外光谱研究

利用中红外可调谐二极管激光光谱仪,在多程吸收池中接入脉冲超声喷射系统,研究了Ne-N2O van derWaals复合物在N2O单体ν1振动带的振动转动光谱,运用光谱预测程序SPCAT和分子参数拟合程序SPFIT及谱线拟合程序Wang程序拟合出了Ne-N2O的ν2带的振转分子常数,并计算了出结构参数R、θ、ΔI。结果表明,所探测到的20 Ne-N2O的29条、22 Ne-N2O的15条高分辨谱线被准确地标识为Ne-N2Oν2振动转动光谱;20 Ne-N2O和22 Ne-N2O van der Waals复合物均为近T型结构,惰性气体分子和N2O分子质心的连线略微偏向N2O分子的氧原子方向;复合物ν2振动带的带头分别为ν0=1285.12236(9)cm-1和ν0=1285.12299(21)cm-1,与N2O单体的ν1振转谱带的带头相比较,带头蓝移0.21906(10)cm-1和0.21969(22)cm-1。     

镇杭成品油管道投运及航煤质量动态控制

概述了镇杭成品油管道的基本设施、工艺流程、油品输送顺序以及输油工艺,就柴油顶水通球、航煤输送和柴油置换航煤等投运过程进行了重点介绍,并对投运过程中出现的问题进行了分析,针对航煤“银片腐蚀”问题,提出了具体的质量动态控制方法。     

高压均质过程中射流噪声与空化效应的关联分析与实证

空化效应是高压均质破碎的重要作用机理。为考核不同射流均质条件下空化效应的改变,依据流体动力学及空化理论,对空化效应导致射流噪声进行了分析、测算,并对乙醇—水为二元组分载料介质的射流均质过程中两者的相关性进行了试验验证。理论分析表明,通过添加低沸点载料介质可以明显强化空化效应,二元组分载料介质中的乙醇摩尔分数xA从0趋近1时,空化效应呈先强后弱的规律,推断射流噪声的声压量级及频谱特性也会发生相应变化,射流噪声的实测结果与理论分析基本一致。结果表明,通过检测射流噪声,可以方便、间接地考查射流均质过程中空化效应的改变,评价空化效应潜在的能量特点。     

Extended theoretical analysis of jet and atomization under high-pressure spraying and collecting dust mechanism of droplet

The atomization model about interaction of cavitation, turbulence and aerodynamics is put forward through the analysis about the control equation of jet disturbance, the computed result of the dispersive jet equation, according to the conceptual model of spray based on two-phase flow. The action of cavitation and turbulence formed inside nozzle are thought to lead to the first atomization near the nozzle exit, while the aerodynamic effect controls the following second atomization process. And the critical Weber number 〖BP(〗［We］=12(1+1.077Oh1.5)〖BP)〗 is taken as the judgment index for occurring of the second atomization or not. The critical velocity for liquid splitting into droplets is 60 m/s according to the analysis of break mode about liquid drop, furthermore, jet fragmentation and film fragmentation occurs in the first and second atomization respectively. The typical mechanism of dust capture by water-cloud is improved through the active collision theory of droplet to dust particle. It is considered that an optimal relationship exists between collection rate and droplet size when gas containing dust is unsaturated and its temperature is higher than that of liquid, moreover, low fluid velocity can be propitious to the collection of tenuous droplet to exiguous dust on the basis of the same liquid-gas ratio and the same quantity of droplets.     

基于CFX的荸荠采收船水刀喷嘴的有限元分析

基于土壤液化原理的荸荠采收船是集挖掘、清洗、装箱于一体的荸荠采收设备,其水刀切碎系统可以把土壤分块后液化,提高了采收船的工作效率。为此,介绍了采收船和水刀切碎系统的工作原理,利用Solid Works建立了水刀喷嘴的实体模型,导入ANSYS Workbench环境下的CFX进行流体分析,得出了流度最小和流速最大的喷嘴的水流速度分布。根据分析结果,选择了离心泵型号。     

内蒙古通辽市1次暴雨天气过程成因分析

以内蒙古通辽市2013年7月15—16日暴雨天气过程为研究对象,分析了自动气象站、高空及地面形势、云图、雷达图等实况资料,以及暴雨时段的物理量场,并探讨了暴雨天气过程的形成原因,以期为今后的相关工作提供思路和方法。     

Successful ventilatory management of post‐anesthetic airway collapse and hypoxemia in a dog

Abstract Objective: To report a life‐threatening complication (airway collapse) associated with a common procedure (anesthesia) and to describe its successful management. Case Summary: A dog without pre‐existing signs of respiratory disease developed hypoxemia and severe atelectasis in the post‐anesthetic recovery period and was demonstrated, by bronchoscopic examination, to have severe airway collapse. Mechanical ventilation was used to re‐expand collapsed lung units and to prevent re‐collapse. A ventilation strategy designed to minimize airway and alveolar trauma was used. The dog was successfully weaned from the ventilator and made a full recovery. Unique Information Provided: Acute, severe hypoxemia due to airway collapse occurred in the post‐operative period in a dog with no signs of pre‐existing respiratory disease. The dog was successfully managed with short‐term mechanical ventilation. High frequency jet ventilation was used for a diagnostic bronchoscopy.     

Experimental study on nitrobenzene by cavitating water jets assisted with Fenton

Nitrobenzene compounds,featured with weak mutagenicity,chemical stability,are difficult to be purified by traditional degradation method.Several factors involved in the nitrobenzene wastewater degradation are comparatively analyzed by cavitating water jets assisted with Fenton.The removal ratio of nitrobenzene,whose concentration is 50 mg/L,reaches 95.06% when the Fe2+ concentration is 40 mg/L,the pH value,5.0,the hydrogen peroxide concentration,150 mg/L,the confining pressure,0.5 MPa,and the jetting pressure,10 MPa.The degradation mechanism,shown by high performance liquid chromatography (HPLC),is that the cavitating water jet impelled the Fenton to release more HO· and enhances the catalytic capacity of Fe2+,then the nitrobenzene is degraded or oxidized totally,or graded into small organic molecules such as chain hydrocarbon and organic acids,etc.Besides,the intermediate products,including Benzoquinone,4 Nitrophenol,2 Nitrophenol and Hydroquinone,are also shown by HPLC.     

基于射流冲击的穴盘立式取苗器取苗过程的分析研究

为了提高番茄移栽的自动化水平及无损取苗的效率,以穴盘立式取苗器为载体,对于其射流冲击取苗过程中的苗钵的受力情况及空间流场参数变化进行分析研究,得到理想状态的射流冲击模型,解析出投苗初速度的影响因素。同时,分析了各因素水平的主次关系,证明了零速投苗的可行性,并通过物理试验验证了分析结论。