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Asked the American people why the United States Air Force equipment is extremely advanced and the security sector can not stop the hijacked aircraft, but also some scientists questioned: jet flame produced by combustion is not sufficient completely destroyed the structure of the twin towers, can not lead to the twin towers Finally, all the collapsed World Trade Center in ruins and found a high temperature molten metal is caused by thermite, it is very likely infer a person the use of explosives blew up the twin towers.

美国民众问道,为什么装备极其先进的美国空军和安全部门无法阻止被劫持了的飞机,也有科学家质疑:喷气式客机燃烧时产生的火焰不足以完全破坏世贸双塔的结构,不能导致双塔最后全部坍塌,而且在世贸中心废墟上发现的熔化金属是一种高温铝热剂所致,因此推断极有可能是某人使用炸药炸毁了双塔。

In order to meet the need of high speed continuous casting,the moulding powder demands lower viscosity,lower crystallization temperature,lower intenerating and melting temperature,high melting rate,optimum basicity and chemical composition.

高速连铸保护渣的物化性能不同于普通连铸,应具有低粘度、低结晶温度、低软化及熔融温度、较快的熔化速度以及合适的碱度和化学成分等特性,以满足高拉速的需要,减少生产事故,提高铸坯质量。

The results show that α-Al2O3 in the two kind s of coatings decreases while the γ-Al2O3 increases after spraying. Rutile-TiO2 transforms to brookite-TiO2 and the inners tress of coating was increased so as to aggravate the expansion of cracking. The pores are small but dense in the conventional coating while bigger but loose in the nano-structured coating. The pores in the nano-structured coating exist almost inside the partially melted region. The pores generated during spraying and the cracks generated during the course of thermal oxidization because of thermal stress are the direct reasons why coatings fail.

结果表明:2种粉末在喷涂之后,涂层中的α-A12O3均有所减少,生成了γ-Al2O3,金红石TiO2相转变成了板钛矿型TiO2相,增加了涂层的内应力,加剧了裂纹的扩展;常规微米涂层中的孔洞细小但密集,纳米涂层中的孔洞较大但不密集,且大部分的气孔都存在于部分熔化区的内部;涂层在喷涂过程中所生成的气孔以及热氧化过程中由于热应力而产生的裂纹是造成涂层失效的直接原因。

Theoretical analysis reveals that the formation of flower-like splats results from the interaction of surface tension, inhomogeneity of thermal contact resistance between flattening drop and substrate and substrate crater. The formation of the craters on the substrate is mainly controlled by substrate melting.

理论分析表明,&花瓣状&层片的形成是熔体表面张力、熔体与基底接触热阻的不均匀性和基底凹坑相互作用的结果;基底凹坑的形成主要由基底熔化所控制。

Laser Cladding Rapid Forming is a new developed technology on the basis of laser cladding and rapid forming in the recent years. In LCRF the substrate and the metallic powder fed synchronously are melt by laser beam and the metallurgical combination is formed, then the compact part with regular figures is manufactured layer by layer on the substrate. LCRF has some special advantages, such as high integration, high production efficiency, wide range of processable materials, no pollution to the environment and so on.

激光熔覆快速成形技术是近年来在激光熔覆技术和快速成形技术的基础上发展起来的一种新技术,通过激光熔化基体和同步送来的粉末,使粉末和基体形成冶金结合,并且在基体上堆积成有规则形状的致密的零件,具有集成度高、生产效率高、柔性好、可加工材料广泛、不污染环境等优点,因此受到了越来越广泛的关注。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。