查询词典 twin-screw

On the rhombohedron face {1011}, Dauphine twinning showed different shapes of etching pits between individuals, because rhombohedron positive form {1011} and negative form {0111} appeared on both sides of twin partition line, while Brazil twinning showed symmetry plane between the irregular triangle etching pits of individuals. On the trigonal prism section 11(average20, Dauphine twinning showed different shapes of etching pits between individuals, because trigonal prism positive form {1120} and negative form {2110} appeared on both sides of twin partition line, while Brazil twinning should show symmetry plane between the ellipse or quadrilateral etching pits of individuals, which was not observed.

菱面体{1010}面上存在道芬双晶处，道芬双晶双晶缝合线两端分别是菱面体正形、菱面体负形出露处，导致蚀坑形状不同；菱面体{1011}面上存在巴西双晶处，不规则三角形蚀坑形态的方位关系为对称面关系；三方柱切面{1120}面上存在道芬双晶处，道芬双晶双晶缝合线两端分别是三方柱正形、三方柱负形出露处，导致蚀坑形状不同；三方柱切面{1120}面上存在巴西双晶处，椭圆形或四边形蚀坑方位应为对称面关系，但实验中未见到。

It has been found that there are some texture flaws such as large grain、badly distorted twin and streaky structure. But recrystallization grains ofaround 19μm in diameter on average are obtainable through heat treatment at300℃for 30min by air-cooling, meanwhile the twin and streaky structurethat would weaken the plasticity of alloy are eliminated; significant elementsare holding temperature、holding time、cool-down methods. Mechanicalproperties of tube are obtained, simple tension elongation ratio of arc testsample increases from 10.8% to 20.1%, elongation ratio with elastic internaldie of tube increases from 8.0% to 14.9%.

研究结果表明：挤压成型的AZ31镁合金管材组织中存在变形程度很大的孪晶、大尺寸晶粒、丧失了进一步变形能力的条带状组织等易导致后续塑性加工时变形不均，引起断裂的组织缺陷；采用最佳等温热处理工艺以20℃／min加热至300℃保温30min后空冷处理可以使试样平均晶粒直径从挤压态的50μm细化为19μm，同时基本消除上述组织缺陷；明显影响热处理效果的因素为保温温度、保温时间、冷却方式；室温下，采用最佳工艺热处理前后管材弧形试样的单向拉伸伸长率由10.8％提高至20.1％，管件的自由胀形极限伸长率由8.0％提高至14.9％。

On the basis of the research on the typical high-speed passenger ship with twin skeg in the Yangzi River, the research and development of twin skeg ship are analyzed, including the problems of propulsive efficiency, vibration and the study of ship forms with large block coefficient and shallow-draft.

在对长江典型双尾鳍快速客船调研的基础上，就双尾鳍船型的研究与发展，从推进效率、振动、大方形系数船型及浅水船型的研究等方面进行了分析

Methods The components of somatotype were calculated by using Heather-Cater method in a total of 376 twin pairs of Han nationality,including 245 monozygotic and 131 like-sex dizygotic twin pairs aged 6 to 18 years.

方法采用Heath-Carter法对376对6~18岁同性别汉族双生子(同卵双生子245对，异卵双生子131对)的体型三因子进行计算。

Methods The triceps and subscapular skinfolds were measured and the body composition were estimated by using Changling's and Brozek's models in a total of 376 twin pairs of Han nationality,including 245 monozygotic and 131 likesex dizygotic twin pairs aged 6 to 18 years.Modelfitting method with Mx package was performed to evaluate the proportion of variance components and to analyze the effect of sex,age and development period on the skinfold thickness and body composition.

测量376对6～18岁同性别双生子(同卵245对，异卵131对)肱三头肌、肩胛下皮褶厚度，用长岭和Brozek公式估算体成分；用Mx软件拟合最佳模型，计算各指标遗传与环境方差组分，分析年龄、性别和不同发育期的作用。

Moreover, the hot compressive deformation behavior of the RS/PM AZ91 magnesium alloy and AZ91 alloy matrix composite were also investigated, the conclusions are drawn as follows:1. The processing parameters of the atomization-twin rolls quenching technology were optimized as follows: the diameter of the nozzle 1mm, the wheel velocity 25m/s, the pressure of atomization gas 0.3MPa and Ar gas for melt injection 0.1MPa. The RS AZ91 alloy flakes exhibited fine and uniform microstructures. When the flakes were extruded at 673K, extruded velocity of 0.1mm/min and extrusion ratio of 25:1,the magnesium alloy rods with clean surface, uniform dimension and excellent mechanical properties were obtained.2. The RS AZ91 magnesium alloy powders prepared by atomization-twin rolls quenched technology exhibited fine equiaxed grains with the grain size of 1-3μm, the phase constituent included supersaturate solid solution phaseα-Mg and miner fineβ-Mg_(17)Al_(12) phase. The as-extruded materials also exhibited equiaxed grains with the size of 5-7μm and a large number of fineβ-Al_(12)Mg_(17) and fewer AlMg_2Zn phases were detected in the alloy.

本文还研究了快速凝固/粉末冶金AZ91镁合金热压缩变形流变应力行为，快速凝固/粉末冶金法原位生成Mg_2Si增强AZ91镁基复合材料，经过系统的研究，获得如下结论：1、雾化-双辊急冷法在下列工艺参数组合下：双辊线速度25m/s；喷嘴直径1mm；熔体压射压力0.1MPa；雾化气体压力0.3MPa。，可获得宏观尺寸细小、微观组织均匀细小、综合性能优良的的快速凝固AZ91镁合金细碎箔带，快速凝固箔带在挤压温度为673K、挤压速度为0.1mm/min，挤压比为25：1时，可获得的外表光洁、尺寸均匀、组织性能优异的镁合金棒材。2、雾化-双辊急冷法制备的AZ91镁合金粉末态为细小等轴晶组织，晶粒尺寸1-3μm，组织为α-Mg过饱和固溶体和微量的细小β-Mg_(17)Al_(12)相组成；粉末挤压棒材为等轴晶组织，晶粒尺寸5-7μm，组织中含有大量细小的β-Al_(12)Mg_(17)以及AlMg_2Zn析出相，室温力学性能，抗拉强度383MPa，屈服强度275MPa，断后伸长率7.5%。

The principle of twin symmetry roll axle-mill was introduced.A new process was proposed which was for twin symmetry roll axial rolling passive spiral bevel gears.The deformation process by the new technology was analyzed by rigid plastic FEM software.Rolling force was calculated in theory.

介绍了对称双辊轴向轧机原理，提出了对称双辊轴向轧制成形螺旋锥齿轮新工艺，利用刚塑性有限元模拟软件对新工艺变形过程进行了仿真分析，对成形工艺力进行了理论计算。

Among these was the Mikoyan MiG-25 Foxbat, a twin-engined, twin-tailed fighter capable of a Mach 2.8 performance.

他们中间有米高扬的米格-25狐蝠，一种双引擎，双垂尾，速度达2.8马赫的战斗机。

Sikorsky S-92 twin-engined medium-sized helicopters price, S-92 Sikorsky Aircraft Corporation in the United States to develop a medium-sized twin-engined helicopter price.

西科斯基S-92双发动机中型直升机价格，S-92是美国西科斯基飞机公司研制的双发动机中型直升飞机价钱。

Weapons: The Doomblade mounts 2 X Multi-Lascannos, 2 X Conqueror cannon, a twin-linked heavy bolters, a Laser Destroyer, twin Doomblade Vanquisher cannons

武器：末日之刃装备2门多管激光炮，2门征服者加农炮，1座双联重矢弹枪，1门激光毁灭炮，双管末日之刃型粉碎者加农炮。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了