Directional solidification of Pb-Sn eutectic with vibration

Pb-Sn eutectic alloy was directionally solidified at 1.4 to 3.2 cm/hr with forced convection induced by axial vibration of the growth ampoule with a frequency of 10 to 40 Hz and an amplitude of 0.5 to 1.0 mm. To determine the exact growth rate, an interface demarcation technique was applied. The lamellar spacing was increased 10 to 40 percent in ingots solidified with vibration compared to those solidified without vibration. The average intensity of convection in the melt under axial vibration of the ampoule was estimated by comparing the experimental results with a theoretical model

Directional solidification of Pb-Sn eutectics with vibration

Pb-Sn eutectic alloy was directionally solidified at 1.4 to 3.2 cm/hr with forced convection induced by axial vibration of the growth ampoule with a frequency of 10 to 40 Hz and an amplitude of 0.5 to 1.0 mm. To determine the exact growth rate, an interface demarcation technique was applied. The lamellar spacing was increased 10 to 40 percent in ingots solidified with vibration compared to those solidified without vibration. The number of grain boundaries was increased by vibration. The average intensity of convection in the melt under axial vibration of the ampoule was estimated by comparing the experimental results with a theoretical model

La faute d'éthique médicale

Depuis la moitié du XXe siècle, le comportement des patients face aux praticiens accuse une certaine méfiance. La multiplication de scandales sanitaires tels que l'affaire du Distilbène, du sang contaminé, de l'hormone de croissance mais aussi le développement des ressources numériques facilement accessibles sont autant de facteurs expliquant ce changement. Ce mémoire a pour finalité d'identifier la faute d'éthique médicale afin d'aiguiller les patients confrontés à certaines dérives

Federalização dos crimes contra os direitos humanos

Este estudo tem como objetivo demonstrar a substancial constitucionalidade e auto-aplicabilidade da norma expressa no artigo do artigo 109, inciso V-A, § 5º, da Constituição Federal de 1988, introduzido pela EC 45/04. Propõe, ainda, definir críticas concernetes à incidência e delimitação do instituto, com base na legislação interna e externa

Stabat Mater : affliction, pleasure and sublimation in the search of an identity

“Stabat Mater" propone la historia de una joven que sufre por el dolor del abandono en su niñez. Cecilia, la protagonista de esta novela de carácter intimista, transcurre los días de su existencia en forma trágica y rutinaria. Su pena no tiene consuelo ni respuestas: su madre la abandonó en un orfanato veneciano y, a diferencia de la suerte corrida por otras jóvenes, posteriormente nadie la reclamó ni fue por ella. Las clases de música impartidas en el orfanato son su único –aunque monótono– consuelo. Pero un factor inesperado cambiará el tedio en pasión: el mismo maestro Antonio Vivaldi se hará cargo de dichas lecciones. Él enseñará a Cecilia y a sus compañeras la música del universo todo, con los matices más profundos, sutiles y estremecedores jamás imaginados. A través de esta vivencia, determinante en el ánimo de la joven, esta construirá su futuro, un destino erigido a partir de recuerdos dolorosos, pero resignificado y sublimado en función de la experiencia vivida.“Stabat Mater" proposes the story about a young girl,with a affliction carried from her childhood. Cecilia, the main character in this novel with intimate style, pass her existence´s days in a tragic and rutinian way. Her pain hasn´t got any answer or comfort: her mother leave her alone when she was a litlle girl on a venecian orphanage. She wasn´t as lucky as the other girls, because nobody came for her never. The music classes are her unique and monotonous consolation. But an unexpected factor will change everything: Antonio Vivaldi in person will be in charge of those lessons. He will teach Cecilia and her friends the universe´s music at all, with the most subtle, shocking and deepest tints ever thought. Through this experience, determinant in the girl´s spirit, she will build her future, a destiny formed from pain memories, but sublimate and redefined by her life experience.Fil: Caram, Graciela Beatriz. Universidad Nacional de Cuy

Survey of occupational opportunities for graduates of Westford academy in the town of Westford

Thesis (M.A.)--Boston University, 1946. This item was digitized by the Internet Archive

An analysis of the literature dealing with objectives, content, trends, and methods of bookkeeping in the secondary school.

Thesis (M.A.)--Boston Universit

Influence of convection on microstructure

The mechanism responsible for the difference in microstructure caused by solidifying the MnBi-Bi eutectic in space is sought. The objectives for the three year period are as follows: (1) completion of the following theoretical analyses - determination of the influence of the Soret effect on the average solid composition versus distance of off-eutectic mixtures directionally solidified in the absence of convection, determination of the influence of convection on the microstructure of off-eutectic mixtures using a linear velocity profile in the adjacent melt, determination of the influence of volumetric changes during solidification on microconvection near the freezing interface and on microstructure, and determination of the influence of convection on microstructure when the MnBi fibers project out in front of the bismuth matrix; (2) search for patterns in the effect of microgravity on different eutectics (for example, eutectic composition, eutectic temperature, usual microstructure, densities of pure constituents, and density changes upon solidification); and (3) determination of the Soret coefficient and the diffusion coefficient for Mn-Bi melts near the eutectic composition, both through laboratory experiements to be performed here and from data from Shuttle experiments