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In Part II we describe a fully automated tracking scheme for the determination of a sequence of velocity vectors within a three-dimensional observation volume of a fluid flow.
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Scanning electron microscopy using the freeze-cracked and maceration method is a useful and simple method for three-dimensional observation of the filamentous structures in NFTs.
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Histochemical, ultrastructural, and three-dimensional observation of smooth muscle cells in human gastric mucosa
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The histological reconstruction method, using serial histological sections, was adopted for the three-dimensional observation.
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Three-dimensional observation with a confocal scanning laser microscope of fibronectin immunolabeling during cardiac looping in
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In Part II we describe a fully automated tracking scheme for the determination of a sequence of velocity vectors within a three-dimensional observation volume of a fluid flow.
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Scanning electron microscopy using the freeze-cracked and maceration method is a useful and simple method for three-dimensional observation of the filamentous structures in NFTs.
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Histochemical, ultrastructural, and three-dimensional observation of smooth muscle cells in human gastric mucosa
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The histological reconstruction method, using serial histological sections, was adopted for the three-dimensional observation.
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Three-dimensional observation with a confocal scanning laser microscope of fibronectin immunolabeling during cardiac looping in
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| A three-dimensional real-time observation instrument was developed, which was con- sisted of crystal part, optic observation part, and result analysis part. The crystal growth and flow movement was observed by the two-eye observation method. A new growth furnace and crucible, being suitable for Bridgman method crystal growth, was developed. The solidliquid interface of NaNO3 was visualized. At last the image visualized was synthesized into three-dimensional image by a processing software. | 最近建立一套用干晶体三维实时观察的装置,主要分为光学观察部分,晶体生长部分,结果处理部分.采用二目观察法记录晶体生长和流体运动.设计并制造适于Bridgman法晶体生长的生长炉和坩埚.初步观察到NaNO3晶体的固液界面形貌,并通过图像处理软件还原为三维真实图像. | The fluid flow effects and temperature field in low temperature oxide melt crystal growth have been simulated numerically in the Three dimensional Space in Situ Observation Facility.The results indicated that the complicated couple vortex modes in melt was found under ground crystal growth and the gravitation has an important influences on the distribution of temperature field and velocity field of melt.But in space,when the microgravity level arrived to some extent,the simplest flow modes appeared and the... The fluid flow effects and temperature field in low temperature oxide melt crystal growth have been simulated numerically in the Three dimensional Space in Situ Observation Facility.The results indicated that the complicated couple vortex modes in melt was found under ground crystal growth and the gravitation has an important influences on the distribution of temperature field and velocity field of melt.But in space,when the microgravity level arrived to some extent,the simplest flow modes appeared and the fluid flow effects have little influences on the unstability resulted from the heat transport and mass transport in melt crystal growth. | 地面上 ,由于受浮力对流、分层和沉淀等因素的影响 ,难以阐明晶体生产和凝固现象的本质 ,从而无法获得组份均匀、结构完整和性能优良的材料 ,因此自七十年代以来 ,已进行了大量的空间晶体生长实验 ,但由于对空间环境在晶体生长过程中的流体效应参数缺乏了解 ,实验结果往往与设想的不一致。数字模拟方法可以模拟实际晶体生产过程 ,了解晶体生长参数的变化对晶体生长的影响 ,本文利用数字模拟的方法 ,对本实验室建立的空间三维实时观察装置中 ,低温生产NaNO3熔体晶体中的流体效应及温场进行了数字模拟研究 ,结果表明 ,在地面生长 ,熔体内部存在复杂的双涡流动模式 ,重力对熔体中的温场和速度场的分布产生强烈的作用 ,而在空间 ,当微重力水平达到一定程度时 ,可以使熔体中的流动模式简单化 ,从而降低流动效应对传热、传质造成的不稳定性和不均匀性 ,有利于提高晶体生长的质量。同时通过对流场中的温度分布分析表明 ,降低重力可以明显改变晶体生长固液界面附近的温度梯度 ,并使温场 ,速度场分布朝着稳态生长的方向发展 |   |
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