气泡

The ascent rate decreases with time and the terminal velocity has an extreme value corresponding to bubbles with fixed diameter according to the experiment.

实验结果表明，水中气泡上升速度的大小都在随时间减小，气泡的末速度存在一极值，它与一定大小的气泡相对应。

The boiling behaviors on vertical surface and inside triangular channels were visualized with a digital video camera.

池沸腾时，气泡在加热表面产生、长大并自然脱离；当沸腾在有限空间进行时，气泡的生成和脱离受到限制，气泡会受到壁面的挤压而变形。

The products are applied to measure the level of vaporizable liquid especially liquefied gas. Blocking lever is used to divide guide tube into gasification chamber and measure chamber. When liquefied gas is infected by temperature and vaporize into being gas bubbles, the bubbles will rush up along gasification chamber and not enter into measure chamber to affect magnetic float.

该产品适用于易汽化的液体测量，尤其适合液化气介质的液位测量；其特点是用挡杆将液位计主导管内腔分成气化室和测量室，当液位计内液化气受温度影响，内部汽化而产生气泡时，气泡会顺着气化室往上冒，而不会进入测量室影响磁浮子工作，有效地阻止了因气泡

When the gas flux is constant, the ratio of reduced resistance is improved with the increase of the water stream velocity. However, the relationship between the gas flux and the ratio of reduced resistance is more complex. When the water stream velocity is constant, if the gas flux is small in contrast, the effectiveness of reduced resistance is not obvious. But when the gas flux increased, the jetted gas will form """"archform"""" which will augment the shape resistance. In this condition, resistance could not be reduced and could even be increased, if the gas flux continues to be increased. So that there needs setting a baffle called step, which introduces the jetted gas into the turbulence boundary layer. In this case, the shape resistance may be fairly great. Besides, the waterline of model has also some effect on the ratio of reduced resistance, which acts on the size of wave. If waterline is deep, the wave could not affect the deployment of microbubble layer, so there is almost no effect on ratio of reduced resistance. However, the wave would affect distributing of microbubble layer under the model so that the gas could leak out from the two sides of model and directly affect the ratio of reduce resistance if the waterline is very small. Whether installing the dashplate or not has also the great influence on the effectiveness the ratio of reduced resistance. From the results of experiment, conclusion is that adding dashplate will greatly improve the effectiveness of reduced resistance.

当喷气量一定时，水流速度增大，减阻率提高；喷气量与减阻率之间的关系比较复杂，速度一定时，如果喷气量较小，减阻效果就比较差，但当喷气量增大的话，喷射出的气体就会形成一个&拱度&，增加了船模的形状阻力，在这种情况下最好采取断阶喷气，把气体引入到湍流边界层中，在这种情况下，船模的形状阻力比较大；船模的吃水对减阻率也有一定的影响，主要表现在波浪大小上，如果吃水较深，波浪影响不到微气泡层的分布，对减阻率不会造成太大影响，如果吃水较浅，波浪就会影响到微气泡层在船模底部的覆盖情况，可能会有部分微气泡从船模两侧泄漏，这样就直接影响到了减阻效果；是否安装压浪板，对减阻率也有较大的影响，从试验结果可以看出，在船模尾部加设了压浪板时，减阻效果明显得到改善。

It introduced the classical theory of bubble nucleation during the process of foam plastics , and presented the calculation formulas about the radius of critical nucleation , required Gibbs free energy and nucleation rate of some kinds of nucleation. It reviewed the development of classical theory of bubble nucleation , including the influence of free volume and oversaturation on bubble nucleation , and pointed out the existing deficiencies in explanation of classical theory of bubble nucleation to bubble nucleation of dynamic polymer melt.

介绍了泡沫塑料加工过程中气泡成核的经典理论，给出了几种成核方式的临界成核半径、所需克服的吉布斯自由能及成核速率的计算公式；评述了经典成核理论的发展，包括自由体积和气体过饱和度对气泡成核的影响，并分析指出了经典成核理论对动态聚合物熔体气泡成核解释存在的不足。

The cell structure refining mechanism shows that adding Mg decreases the surface tension of the aluminum alloy melt and hence to increase the bubble stabilization. Adding nuclear forming agent increases the nuclei of heterogeneous nucleation. Adding pre-heating foaming agent postpones its decomposition, hence to increase the uniform of foaming agent dispersion. Stirring within the middle stage of foaming agent rapid decomposition breaks up big bobbles to fine bobbles, hence to reduce mean cell diameter.

孔径细化机理分析表明，Mg的作用在于降低铝熔体的表面张力，提高气泡稳定性；形核剂的作用在于增加气泡非均匀形核的核心；发泡剂氧化预处理可以推迟和延缓发泡剂的分解，提高发泡剂的分散均匀性；搅拌发泡的作用是在发泡剂剧烈分解的中段，通过搅拌搅碎气泡，减小平均孔径。

Bubble Act in accordance with the parameters determined the number of bubbles in the hardening concrete, the size and spacing, concrete calculation of gas, air space, and other factors to evaluate the parameters of the concrete structure of antifreeze.

气泡参数法根据测定硬化混凝土中气泡数量、大小和间距，计算混凝土含气量检测仪器、气泡间距系数等参数来评价混凝土结构的抗冻性。

Bubble Act in accordance with the parameters determined the number of bubbles in the hardening concrete, the size and spacing, concrete calculation of gas, air space, and other factors to evaluate the parameters of the concrete structure of antifreeze.

气泡参数法根据测定硬化混凝土中气泡数量、大小和间距，计算混凝土含气量、气泡间距系数等参数来评价混凝土结构的抗冻性。

This paper mainly described the pertinent knowledge about the generalization of gas supersaturation, the reasons and factors for gas supersaturation. Furthermore, the relations among life stage, hydrostatic pressure, temperature, intermittent exposure, detection, avoidance and the tolerance of fish to supersaturation were analyzed, AndKey words: dam; dissolved gas supersaturation; gas buhhle disease

本文主要就气体过饱和及气泡病做了具体描述，首先叙述了气体过饱和的研究概况、导致气体过饱和的原因和水温、压强等影响气体过饱和的因素，具体分析了鱼类不同生活阶段、液静压、温度、间歇性的暴露、探知和躲避能力导致其对气体过饱和忍耐大小的状况，并对气泡病的内部损伤如血液中形成的气栓、外部症状如身体各个部位形成的气泡做了具体的描述。

The mechanism of void formation in roto-moulding of long-fiber reinforced resin is studied through some experiments.

利用试验的方法研究了长纤维增强反应性树脂复合材料旋转模塑成型工艺气泡的形成机理，得到了制品表面气泡形成过程的直观模型，分析了气泡形成的影响因素，并分别研究了各个因素的影响机理。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。