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Why?" I questioned in puzzle ment . He smiled and drew a circle on a piece of paper, then made a dot in its circumference and asked me,"Which way is the shortest to reach the symmetrical dot in the circumference from this point?""Diameter , I responded , and with this answer I suddenly realized that I was lucky enough to live a diametrical life , namely, a very smooth life . Since I exposed myself to the research in materials, I have been aspir ing to become a scientist, and God has blessed me with a diametrical life without any waste of time or life.

我问父亲,父亲微笑着拿起手中的圆规在白纸上画了一个圆,在圆周上点下一点,问我道:"在同一个圆上的一点到达与之相对称的另一点,什么样的方式是最快的呢""直径",当答案从我的嘴中脱口而出之时,我猛然间也明白了我的幸运就在于我的直径人生,从我进入物理的领域到今日希望成为一名杰出研究者的理想,上帝让我幸运的获得了走这条直径的机会,没有浪费时间和生命。

In order to analyze the influence of the center air pipe diameter change on the combustion effect, numerical modeling was applied to numerical calculation on the temperature field of such type of boiler,through which temperature field in five different schemes were obtained. In addition, the influence law of change of the diameter of the center air pipe on the temperature field was analyzed. The temperature of the nearly-back wall region takes on a firstly decreasing and then increasing change with the diametrical decrease of the central wind pipe.

为研究改变中心风管直径后的4层燃烧器对炉膛燃烧的影响,采用数值模拟的方法对该型锅炉炉内的温度场进行数值计算,得到5种不同方案下该型锅炉炉内的温度场分布,并分析了中心风管直径的改变对炉内温度场的影响规律,即后墙近壁区温度随着中心风管直径的减小呈现先降低后升高的趋势。

The results show that the microscopical pore structure of the three dimensional orthogonal woven carbon fabric structure perform is composed of body-centered cubes which arranged periodically at spaces. The net structure and shape of the pores of perform are determined by the size and proration of the fasciculus diameter, which are key factors influencing the gaseous permeability and final density of composites. Once the proration of the fasciculus diameters of different directions is determined, the trend of diversification of the permeability followed by pore rate during CVI process and the density of composites are stated, and the permeability increases with the increase of the fasciculus diameter.

研究结果表明:三维正交结构炭纤维预制体的宏观孔隙结构在空间上可以看成是由呈周期性排列的体心立方"晶胞"构成; X , Y 和 Z 3个方向纤维束直径大小及比例关系决定三维正交结构炭纤维预制体宏观孔隙网络的结构和形状,也是决定反应气体在孔隙中的比渗透率和复合材料最终致密度的重要因素;当 X , Y 和 Z 3个方向纤维束直径的比例关系一定时,不同预制体在CVI增密过程中比渗透率随孔隙率变化的趋势相同;复合材料的最终致密度一定;比渗透率随纤维束直径增大而略有增大。

The effect of additives on synthesis of xonotlite fiber with nano diameter is studied using industrial lime and quartz powder,selecting calcium chloride,strontium nitrate,zirconium oxychloride as additives.

采用工业石灰和石英粉,选用氯化钙、硝酸锶、氧氯化锆为添加剂,研究添加剂对合成纳米直径硬硅钙石纤维的影响,结果表明,几种添加剂均对生成硬硅钙石纤维有一定的帮助,加入适量的氧氯化锆添加剂,可以制备出纳米直径的硬硅钙石纤维,氧氯化锆的添加量为Zr4+/(Ca2++Si4+)=0.02时,可获得结晶良好、直径为70~100 nm的硬硅钙石纤维。

Studied the solid particles cyclone separation under structural parameters and operating parameters of different hydrocyclone, the results showed that major factor influence split ratio is in the ratio of entrance to exit pressure of hydrocyclone. Exit pressure has a certain influence on the split ratio, the various of the diameter and cone angle of hydrocyclone (in the ratio of entrance to exit pressure is constant) have no influence on split ratio; With diameter and cone angle increase, the separation granularity gradually increasing and recovery ratio decreasing; With entrance pressure increase, the separation granularity of hydrocyclone decrease, the split ratio of underset will increase slowly; With the diameter of overflow pipe increase, the separation granularity of hydrocyclone increasing and recovery ratio decreasing; With the diameter of underset pipe increasing, the separation granularity of hydrocyclone decreasing and recovery ratio increasing.

在不同的水力旋流器结构参数和操作参数下,对固体颗粒的旋流分离进行了分析研究,结果表明:旋流器的排出口比是影响分流比的主要因素,进口压力对分流比有一定影响,水力旋流器的直径变化和锥段角度变化对分流比基本上没有影响;随着直径、锥段角度的增大,分离粒度逐渐增大,回收率降低;随着入口压力增大,水力旋流器的分离粒度变小,底流的分流比会缓慢增加;随着溢流管管径的增加,分离粒度增大,分流比明显减小,回收率降低;随着底流管直径的增加,分离粒度减小,分级效果明显下降,回收率会增加。

If the maximum unpierced diameter won't fit on the test pattern, please provide a separate set of samples.

若最大直径区域在附件 T2 样品图中无法装下,请另外准备一组体现最大直径的样品。

The results show that the microscopical pore structure of the three dimensional orthogonal woven carbon fabric structure perform is composed of body-centered cubes which arranged periodically at spaces. The net structure and shape of the pores of perform are determined by the size and proration of the fasciculus diameter, which are key factors influencing the gaseous permeability and final density of composites. Once the proration of the fasciculus diameters of different directions is determined, the trend of diversification of the permeability followed by pore rate during CVI process and the density of composites are stated, and the permeability increases with the increase of the fasciculus diameter.

研究结果表明:三维正交结构炭纤维预制体的宏观孔隙结构在空间上可以看成是由呈周期性排列的体心立方&晶胞&构成; X , Y 和 Z 3个方向纤维束直径大小及比例关系决定三维正交结构炭纤维预制体宏观孔隙网络的结构和形状,也是决定反应气体在孔隙中的比渗透率和复合材料最终致密度的重要因素;当 X , Y 和 Z 3个方向纤维束直径的比例关系一定时,不同预制体在CVI增密过程中比渗透率随孔隙率变化的趋势相同;复合材料的最终致密度一定;比渗透率随纤维束直径增大而略有增大。

The hydraulic loss of conduit in both vertical pump system and bulb tubular pump system were calculated using the numerical simulation, and the influence of pump impeller diameter on hydraulic loss of conduit was analyzed. Based on the similitude rules of impeller pump, the relationship between pump impeller diameter and nD value and the influence of pump selection and design were analyzed.

采用数值计算的方法,分别计算了具有不同水泵叶轮直径的立式轴流泵装置和灯泡贯流泵装置的流道水力损失,比较了水泵叶轮直径对流道水力损失的影响;根据叶片泵的相似律,分析了在一定设计流量条件下水泵叶轮直径与nD值的关系以及对水泵选型设计的影响。

Simulation result shows that X-ray spot size is almost certainly convergent when the number of beamlets increases gradually,and the convergent size is about 1.03 mm.

计算结果表明:子束流层数一定时,焦斑直径波动在0.03mm范围内;随子束流划分层数的不同,计算所得焦斑直径的最大不确定度为±0.05mm,而焦距几乎不变化,其波动在0.08cm范围内;随子束流划分层数的增加,焦斑直径计算结果是收敛的,最终收敛值约为1.03mm。

This paper experimentally studied smash characteristic of com straw, including mainly performance parameter of pulverizer such as consumption of electricity per ton, hour productivity and hammer patch thick under the condition of different moisture rates and sieve pore diameter .

本文主要对不同含水率、筛孔直径下粉碎机的吨料电耗、小时生产率及锤片厚度等性能参数进行了玉米秸秆粉碎特性试验研究,结果表明:对于相同筛孔直径,随着含水率的增大,负荷输入功率基本不变,吨料电耗增加,生产率降低;对于相同含水率的玉米秸秆,随着筛孔直径的增大,吨料电耗、负荷输入功率降低,小时生产率增加;度电产量和粉碎效率随着锤片厚度的减薄而增加,当锤片厚度为4mm时,既能够保持较高的粉碎效率,又保证了一定的耐用度。

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