Cavitation in Turbopumps -- Part 1

A free-streamline flow through a cascade of semi-infinite flat plates is taken as a simplified model of the cavitation process in a helical inducer pump. The length and thickness of the resulting cavity is determined as a function of blade geometry and cavitation parameter. Loss coefficients resulting from the cavitation are estimated and representative cavity shapes are calculated to aid in designing the leading edge shape of the blades

Course Evaluations

Evaluation is an intrinsic part of teaching and learning. It can be used as an impetus for updating the entire curriculum, the planning of future courses, and providing direction for future classroom practices. Course evaluations are often used as a part of the ongoing effort to raise standards and improve the quality of the education that a student at any university receives. In exploring how course evaluations could be applied to EFL this paper first looks at what the components of a language program are, and then on the basis of research on course evaluation in the larger educational context, assesses the applicability to EFL of the common evaluations. Before we can evaluate the course, we need to look at the program as a whole, and we need to have an understanding of what the individual components of the program are. In surveying any language program currently in operation, there are eight basic components of the program to be examined: (1)the curriculum, (2)the course description in the student guidebook or course catalog, (3)the syllabus, (4)the textbooks or other materials used in teaching the class, (5)the teachers, (6)the learners, (7)the resources, and (8)the constraints

WETTING AND DRYING IN TWO-DIMENSIONAL TIDAL NUMERICAL MODELS

The purpose of this research is to adapt and improve existing two-dimensional numerical tidal models so that they can cope with regions where the tide falls and rises to uncover and cover inter-tidal banks without incurring numerical shocks which may be caused by the discretization of time and space. This thesis presents a review of current practices in the numerical modelling of flooding and drying banks in two dimensions. A two-dimensional depth-averaged numerical model has been written and is presented. It is used as a tool with which to investigate various existing algorithms which represent the physical process of the wetting and drying of intertidal zones. An alternative method with which to represent the moving boundary has been developed. This method is free from disturbances usually caused by the implementation of a moving boundary in such a numerical scheme. A 2NM numerical model of the Wash, U.K., is run to provide hind-cast tidal data pertaining to a particular site and period. A field programme is established to provide validation data for the model. Finally, conclusions from the programme of research are drawn

Teaching the Voices of History Through Primary Sources and Historical Fiction: A Case Study of Teacher and Librarian Roles

The ability to analyze alternative points of view and to empathize (understand the beliefs, attitudes and actions of another from the other\u27s perspective rather than from one\u27s own) are essential building blocks for learning in the 21st century. Empathy for the human participants of historical times has been deemed by a number of educators as important for the development of historical understanding. The classroom teacher and the school librarian both have a prominent stake in creating educational experiences that foster the development of perspective, empathy, and understanding. This case study was designed to investigate the idea that teaching with primary sources and historical novels during historical inquiry enhances students\u27 development of cognitive and emotive empathy. The study was framed around two research questions: How do classroom teachers and school librarians design and teach historical inquiry using historical novels and primary sources? What is the impact of teaching with historical novels and primary sources on the development of historical empathy? The case study was conducted in an English/history humanities block and the school library in a New York City secondary school. Data were collected through classroom observations, interviews with the classroom teachers and librarian, and samples of student work. On the use of primary sources and historical novels, the study found that primary sources must be surrounded by context to be useful to students in their learning, that secondary sources were necessary for providing that context, and that historical fiction provides social context, but its use must be scaffolded to help students distinguish fiction from fact. In addition, the study found that unless library linkages to primary sources are embedded in classroom instruction, they are not used by students or teachers. In answer to the second research question, the study found that primary sources have a strong impact on the development of historical empathy if their use is mediated by a teacher or librarian and that cognitive empathy must be developed before emotive empathy. Finally, this case study showed that a school librarian\u27s effectiveness is diminished by fulfilling a resource-provider role with no integration into classroom instruction