Parabolic beach marks on a polystyrene fracture surface
The fracture surfaces are generally very sharp and angular, indicating fast, brittle fracture with little ductile tearing. Parabolic 'beach marks', can be seen where the fracture has grown at a speed comparable to the speed of sound in the material. This results in periodic, momentary arrests in the crack propagation and periodic ridges in the fracture surface as it advances. These indicate the direction in which the fracture has occurred. Inside the beach marks is a disc-shaped flat region wher
Beach marks on a polystyrene fracture surface
The fracture surfaces are generally very sharp and angular, indicating fast, brittle fracture with little ductile tearing. 'Beach marks', can be seen where the fracture has grown at a speed comparable to the speed of sound in the material. This results in periodic, momentary arrests in the crack propagation and periodic ridges in the fracture surface as it advances. There is also evidence of the fracture surface branching onto different planes as it progresses.
Fracture surface in polystyrene
The fracture surfaces are generally very sharp and angular, indicating fast, brittle fracture with little ductile tearing. Parabolic 'beach marks', can be seen where the fracture has grown at a speed comparable to the speed of sound in the material (and has thus been periodically arrested) and indicate the direction in which the fracture has occurred. In places, there is evidence of ductile tearing, and also a finely fibrous surface which is the remnant of crazes. There is also some evidence of
Tetragonal Zirconia Polycrystals (TZP)
The comparatively low sintering temperature allows very fine grained (sub-micron), dense and so high strength as well as tough ceramics to be produced. The microstructure shows equiaxed, fine grains with little evidence of weakening grain boundary phases. Such microstructures have some of the highest values of toughness achieved in ceramics.
Health promotion, health education and HIV/AIDS
This article will focus on the role that health promotion can play in preventing the transmission of HIV. The school setting is taken as an example and a range of effective methods and approaches focusing on young people are identified. It gives an outline of the nature of health promotion, followed by consideration of school-based efforts, which aim to protect the future generation, and a summary of some of the strategies that have been effective in this setting. Finally, issues related to heal
Archaeology of Medieval and Tudor Britain
The aim of this course is to provide a broad understanding of the archaeology of Britain in the period c. 1066-1600. Although the bulk of the material will relate to England and Wales, occasional reference will be made to Scotland and Ireland. The course takes a necessarily broad approach to the archaeology of the period. Although the treatment of excavated data will form an important component of the syllabus, other types of evidence will also be considered. For instance, the course will examin
Town and Country in Roman Britain
This course aims to look at the archaeology of various types of urban centres in the province of Britannia Roman Britain and the settlements in the rural areas around them. In particular we will examine the inter-dependence and possible relationships of towns and countryside. We cannot ignore the fact that Britain was only one small province of an Empire which stretched from Asia Minor to Scotland and the Sahara Desert to the rivers Rhine and Danube. We may therefore occasionally have to conside
Guide to Teaching Reading at the Primary School Level
This manual was developed to assist teachers in teaching reading at the primary school level. It is intended to help teachers create an educational vision for ensuring reading abilities and develop an educational philosophy based on this vision.
Ethnic Discrimination Curriculum
This lesson explores discrimination based on ethnicity. The lesson is in three sections, each framed by guiding questions such as: What is ethnicity? How is it different from nationality? What is my ethnic identity? What are some of the causes and impacts of ethnic discrimination? What is being done to address ethnic discrimination? What can I do?
PTC 604: Communication Theory and Research
This course reviews major theories of communication and provides strategies for theory-based research in the field of Professional and Technical Communication. The course focuses on the following research methods: problem statement and hypothesis formulation derived from theory; research design and data generation; existing information sources and their acquisition; and analytic techniques. Our goal in the course is to allow students to develop analytic methods--drawn from traditions in both the
ACCT 615: Management Accounting
The first part of this course is designed to provide students with an insight into key financial accounting concepts needed for effective decision-making. This includes a brief discussion of how to record transactions using T accounts; preparing adjusted trial balances; preparing income statements, balance sheets, and statements of cash flows. Techniques for analyzing financial statements to examine a company’s financial status with respect to profitability, liquidity, and solvency are also di
ISKRA Market Research teachers notes
Title ISKRA Market Research Session - Market Research to determine viability of product idea Learning Outcomes - At the end of this session students will have had the opportunity to perform initial market research on a new product idea with a view to creating a business or social enterprise. Activity - Yes, group based open-ended problem Case Study - Yes, based on a true entrepreneurial experience Teachers Notes -Yes, word document Support Material - PowerPoint slides, Case study Suggested Prere
Sustainable Communities: Research in Action
This core module will enable you to develop a range of key geographical and transferable skills relating to project research and management. You will begin to understand what a professional geographer does through a consultancy based project which will involve interacting with a client (the University) to create real and useful research. This will help instil a sense of professionalism in your work and create high quality outputs. You will also develop an understanding of how businesses and comm
Using Portfolio's for Learning and Assessment - A staff handbook
This resource offers guidance for staff on introducing students to portfolios to be used for learning and assessment. It is based on experience gained while working on an FDTL Project “Promoting the Development of key skills through the use of portfolios” (2002 - 2005). The outlined Portfolio Workshops in this handbook have been developed as a result of the Project activities at Leeds Metropolitan University, but are also supported by the findings from the project as a whole. There are 2 acc
SCY-Science created by you: un environnement en ligne pour apprendre par l'investigation et la conce
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21W.765J Interactive and Non-Linear Narrative: Theory and Practice (MIT)
This course covers techniques of creating narratives that take advantage of the flexibility of form offered by the computer. The course studies the structural properties of book-based narratives that experiment with digression, multiple points of view, disruptions of time and of storyline. The class analyzes the structure and evaluates the literary qualities of computer-based narratives including hypertexts, adventure games, and classic artificial intelligence programs like Eliza. With this base
7.341 Brightening up Life: Harnessing the Power of Fluorescence Imaging to Observe Biology in Action
One summer in the 1960s a young Japanese researcher, with the help of a few high school students, chopped up ten thousand jellyfish. As a by-product of this harvest, they isolated a green fluorescent protein (GFP). Since then, GFP has triggered a revolution in our understanding of gene expression and signaling in live cells. In this seminar, we will examine how this small protein generates fluorescence, i.e. absorbs light of one wavelength and emits light of a longer wavelength. We will discuss
External Quality Control - Register of authorised institutions 11.947 Imaging the City: The Place of Media in City Design and Development (MIT)
Information on biogas & compost offered by arge kompost & biogas, Austria
Kevin Lynch's landmark volume, The Image of the City (1960), emphasized the perceptual characteristics of the urban environment, stressing the ways that individuals mentally organize their own sensory experience of cities. Increasingly, however, city imaging is supplemented and constructed by exposure to visual media, rather than by direct sense experience of urban realms. City images are not static, but subject to constant revision and manipulation by a variety of media-savvy individuals and in
11.947 Imaging the City: The Place of Media in City Design and Development (MIT)