3D Reconstruction technique for tomographic PIV

Tomographic particle image velocimetry(Tomo-PIV) is a state-of-the-art experimental technique based on a method of optical tomography to achieve the three-dimensional(3D) reconstruction for threedimensional three-component(3D-3C) flow velocity measurements. 3D reconstruction for Tomo-PIV is carried out herein. Meanwhile, a 3D simplified tomographic reconstruction model reduced from a 3D volume light intensity field with 2D projection images into a 2D Tomo-slice plane with 1D projecting lines, i.e., simplifying this 3D reconstruction into a problem of 2D Tomo-slice plane reconstruction, is applied thereafter. Two kinds of the most well-known algebraic reconstruction techniques, algebraic reconstruction technique(ART) and multiple algebraic reconstruction technique(MART), are compared as well. The principles of the two reconstruction algorithms are discussed in detail, which has been performed by a series of simulation images, yielding the corresponding reconstruction images that show different features between the ART and MART algorithm, and then their advantages and disadvantages are discussed. Further discussions are made for the standard particle image reconstruction when the background noise of the pre-initial particle image has been removed. Results show that the particle image reconstruction has been greatly improved. The MART algorithm is much better than the ART. Furthermore, the computational analyses of two parameters(the particle density and the number of cameras), are performed to study their effects on the reconstruction. Lastly, the 3D volume particle field is reconstructed by using the improved algorithm based on the simplified 3D tomographic reconstruction model, which proves that the algorithm simplification is feasible and it can be applied to the reconstruction of 3D volume particle field in a Tomo-PIV system.     

新形势下提高大学生可持续就业能力的必要性解析

可持续就业能力是大学生实现自我价值、提高就业竞争力的核心和关键。新形势下,着力提高大学生的可持续就业能力．是构建社会主义和谐社会的前提要求,是实施可持续发展教育的重要环节,是高等教育大众化的必然趋势．也是学生个人全面而自由发展的必然选择。     

论朱德的干部思想

朱德的干部思想是理论与实践的完美统一。他认为：干部在中国革命和建设事业中发挥着重要作用，所以选拔和任用干部必须坚持德才兼备的用人标准和任人唯贤的干部路线，必须全面提高干部的素质。     

“三步走”：家庭经济困难学生就业难之对策思考

高校扩招以来,家庭经济困难学生不断增多,帮助其解决就业问题成为学生工作者不可回避的工作。对于家庭经济困难学生中存在的就业能力相对薄弱、就业取向存在偏差、就业机会不公平等问题,可从家庭、学校与社会三个方面发掘问题产生的原因,有针对性地通过心理解困、职业规划和就业服务＂三步走＂战略,帮助其从心理上＂脱困＂,让他们＂走出去＂,在实践中提高就业能力,争取更多更好的就业机会,实现其人生价值。     

以怨报德林彪与朱德的恩怨情仇

1955年9月27日,中华人民共和国主席授衔授勋典礼在北京中南海怀仁堂隆重举行。在被授予元帅军衔的十大元帅中,朱德年龄最大,度量宽宏,忠厚持重,林彪年龄最小,但心胸狭小,工于心计。在长期的革命与建设的过程中,林彪与朱德之间既曾密切合作,又纠纷不断,结下了许多不解的恩恩怨怨。湘南暴动:朱德慧眼识林彪1928年春,朱德、陈毅率领南昌起义余部,在湖南组织暴动。参加暴动的工农革命军排长林彪被朱德慧眼识中,多次重用,从而使林彪声名鹊起。1928年2月27日,朱德采取迂回战术,一举攻克耒阳。2月29日,当我军后勤部队从永兴县赶往耒阳时,遭到耒阳县…     

大学体育文化建设实证研究

大学体育文化决定着校园体育活动持续健康发展。国内外体育文化建设是一个长期的过程．不仅要借坚历史也要结合当今学校体育运动发展主旋律,建设有自己特色的体育文化．     

你在西藏还好吗

你在西藏还好吗?我们很想你……朋友的短信发来的时候,我正坐在拉萨的草地上,啜饮着夕阳的余光,欣赏披着金色外衣的布达拉宫。突然有种很不真实的感觉,几个月以前,我还在瘦西湖畔漫步,怎么也不会想到有一天会到拉萨支教。想起离别那天,正值烟花三月好时节,带着所有人