Parameters Relevant to Bubble Detachment when Gas-injecting into Polymer Melt Flow Field

The bubble deformation processes were reported when gas was injected into polymer melt flow field in another paper, the experiments showed that the deformation was severely affected by the volume of the bubble, and in turn, for the different bubbles, several different deformation processes were presented during their movement along the flow channel. In addition, we could find that the magnitude of the bubble volume was dependent upon the pressure difference of the gas injection pressure and the melt pressure, In this paper, more experimental conditions were changed to investigate the parameters relevant to the detachment of bubbles from the injection nozzle. The experimental results show that the pressure difference, the melt flow velocity as well as the melt pressure were all critical for the purameters, such as the bubble detachment time, the maximum bubble diometers and the magnitude of the bubble volume. The morphology changes of bubble were very large when the flow field was abruptly changed, and the situations were more complicated.     

正弦扫描振动响应的时频分析

以一个正弦扫描振动响应信号为例,分别应用常用的正弦约减法与短时Fourier变换和Wigner分布进行了对比分析,讨论了在正弦扫描振动激励下结构响应的时频分析问题。结果表明,时频分析方法可以更好地揭示结构的非线性特性或由于层间间隙、连接不牢引起的碰撞等动力学行为,是一种更为有效的正弦扫描振动响应分析方法。     

Bubble Formation through Reaction at Liquid‐Liquid Interfaces

Slag foaming is an important phenomenon in steelmaking processes with both beneficial as well as negative effects. The present work is part of the wider project on the modelling of slag foaming, with special reference to dynamic conditions. Since bubble formation is the first step to foam formation, the present work was carried out in an attempt to simulate the bubble formation in slag/metal reactions in steelmaking processes by water‐modelling experiments. The bubble formation due to the gas produced through chemical reaction at the interface between oleic acid and sodium bicarbonate solution was systematically monitored. The chemical reaction rate was varied by varying the concentration of sodium bicarbonate. The bubbles were observed to be generated in the heavier aqueous phase just below the water‐oil interface. The bubbles penetrated the interface and escaped through the oil phase. The rate of the reaction was estimated from the volume of the gas that passed the water/oil interface. It was observed that the bubble formation and bubble growth mechanism were influenced by the reaction rate while the bubble size seemed to be unaffected by the reaction rate.     

Why Are You Bringing Up Condoms Now? The Effect of Message Content on Framing Effects of Condom Use Messages.

According to prospect theory (A. Tversky & D. Kahneman, 1981), messages advocating a low-risk (i.e., easy, low-cost) behavior are most effective if they stress the benefits of adherence (gain framed), whereas messages advocating a risky behavior are most effective if they stress the costs of nonadherence (loss framed). Although condom use is viewed as a low-risk behavior, it may entail risky interpersonal negotiations. Study 1 (N = 167) compared ratings of condom use messages advocating relational behaviors (e.g., discussing condoms) or health behaviors (e.g., carrying condoms). As predicted, loss-framed relational messages and gain-framed health messages received higher evaluations. Study 2 (N = 225) offers a replication and evidence of issue involvement and gender as moderators. Results are discussed with reference to the design of condom use messages. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Experimental study on upward bubble velocity and pierce length distributions in a water model of copper converter

The upward bubble velocity and the pierce length distributions in a sectional water model of the copper converter in Guixi Smelter in Jiangxi, China, were measured using a two-contact electro-resistivity probe. In the case of using a single tuyere, the bubble velocity distribution along longitudinal direction was similar to that derived from Guassian function. Beyond the center of the longitudinal range, the bubble pierce length exhibited a sudden increase. The upward bubble velocity at a specified location could go up to meters per second. Its probability at a fixed location obeys a lognormal function; the bubble pierce length there varies bellow a few centimeters. In the case of using multi-tuyeres, the upward bubble velocity was roughly uniform right above the tuyeres and showed a slow decrease beyond this region. The bubble pierce length within both of these two regions was roughly uniform. Its average value in the former region, however, was found to be somewhat lower than that in the later.     

臭氧接触装置的传质与吸收试验研究

根据对臭氧接触反应装置影响吸收与传质的主要因素进行的试验研究，归纳出不同孔径扩散器气泡直径与空塔气速关系的经验公式，并对进气中臭氧浓度，鼓泡塔的水力停留时间，水深与臭氧中吸收率的关系进行了试验和分析。     

百纳秒脉冲下水压对水开关击穿特性的影响

以俄罗斯西伯利亚研究院通过实验总结出的液体介质气泡击穿理论的全新阐述作为理论基础,开展了300 NS短脉冲下高压强水介质开关的击穿实验,获得了该条件下水介质击穿场强及耐压时间与水中压强关系的数据。结果表明在300 NS脉冲电压实验平台下,当水介质场强变化率为2~3 MV/CM时,水介质击穿电压和耐压时间均随着水中压强的提高而呈上升趋势,且趋势越来越显著。     

大学生的10种价值观-相关行为结构的联系紧密度研究

研究探讨大学生的10种价值观与各自相关行为的相关程度及各价值观一行为表现之间的关系。结果发现，价值观与相关行为结构存在程度不同的相关性，除变量类型和测量来源，动机内容成为更重要的划分依据。     

合同工资制与专用性人力资本保护

介绍典型企业雇佣制度——合同工资制的特点，在此基础上，分析了员工进行专用性人力资本投资时可能遭受的机会主义风险，并考察了合同工资制是否为其提供了充分的保障．指出在专用性人力资本中非常重要的典型的合同工资制雇佣形式是不适合的，从而有必要通过其他制度安排进行治理．     

The Impact of Rape on Women's Sexual Health Risk Behaviors.

This study used cluster analysis to identify three patterns of sexual health risk behaviors in a sample of adult rape survivors (N=102). Women in the 1st cluster (high risk) reported substantial increases from pre- to postrape in their frequency of sexual activity, number of sexual partners, infrequency of condom use, and frequency of using alcohol and/or drugs during sex. The 2nd cluster (moderate risk) reported increases in frequency of sexual activity and number of partners but mitigated that risk with increased condom use. Survivors in the 3rd cluster (low risk) indicated that their sexual health behaviors had become much less risky postrape. An ecological model predicting cluster membership revealed that individual-level and contextual factors predict patterns of risk behaviors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)