Misoriented interphase boundary between h-BN and SiC grains
The micrograph shows misoriented interphase boundary between h-BN (precipitate) and SiC grains (within a silicon nitride particulate-reinforced silicon carbide composite). The occurrence of BN inclusions results from the introduction of colloidal BN into the hot isostatic pressing process. They are formed from B2O3 present as a thin surface film on the BN particles in the barrier layer. B2O3 will be molten during the pressing process and will diffuse rapidly into the powder compact and react wit
TALAT Lecture 2401: Fatigue Behaviour and Analysis
This lecture explains why, when and where fatigue problems may arise and the special significance to aluminium as structural material; it helps to understand the effects of material and loading parameters on fatigue; to appreciate the statistical nature of fatigue and its importance in data analysis, evaluation and use; it shows how to estimate fatigue life under service conditions of time-dependent, variable amplitude loading; how to estimate stresses acting in notches and welds with conceptual
Al 88, Si 12 (wt%), eutectic alloy
This alloy is of the eutectic composition. From the melt a eutectic is formed between aluminium solid solution and virtually pure silicon. Slow solidification produces a very coarse microstructure. The eutectic comprises large plates of silicon in the aluminium matrix. This microstructure displays poor ductility due to the brittleness of large silicon plates. The microstructure is normally refined through either rapid solidification, which lets the silicon phase assume a fibrous form, or by a pr
Al 88, Si 12 (wt%), eutectic alloy
This sample is a casting alloy of eutectic composition. From the melt a eutectic is formed between aluminium solid solution and virtually pure silicon. Slow solidification produces a very coarse microstructure. The eutectic comprises large plates of silicon in the aluminium matrix. This microstructure displays poor ductility due to the brittleness of large silicon plates. The microstructure is normally refined through either rapid solidification, which lets the silicon phase assume a fibrous for
Delivering Sustainable Development Activity 2: National Strategies
Since 1992 there has seen a significant number of national level initiatives on sustainable development. There has also been a considerable attempt to identify and reflect on those elements within national strategies which represent 'good practice'. Whilst national conditions, circumstances and priorities may be vary sharply, there is growing consensus that a set of key principles represent the foundation upon which to build specific national sustainable agendas. (UNDP/OECD, 2002; IISD/GTZ, 2004
Are You Ready? - Exploring Your Major: Education
Have you considered teaching, coaching, health promotion, Peace Corps or Teach for America as a possible career choice? Are you interested in making a significant difference while making a living? Then join us for this fascinating conversation with two students who will talk about their paths to majors and minors housed in the School of Education. The students will share personal stories about transitioning from high school to Elon, engaging in an academically challenging curriculum, and uncover
South African Child Gauge 2009/2010
The South African Child Gauge is produced annually by the Children Institute University of Cape Town to monitor government and civil society progress towards realising the rights of children This issue focuses on child health. The South African Child Gauge is divided into three parts: PART ONE Children and law reform. Part one discusses recent legislative developments affecting child health In this issue there is commentary on the Children's Act the Prevention of and Treatment for Substance Abus
SAGP Guide to Clinical Medical Practice
Manual originating from personal notes made over many years of semi-rural private and hospital practice in South Africa. A useful resource based on many years of semi-rural private and hospital practice in South Africa involving major trauma, surgery and obstetrics, in addition to the common problems of general practice. I have always felt it very useful to be able to confirm facts and figures at the bedside if needed and this has been the motivation that has taken me over 40 years. This meant
Lessons for Life: Learning and Transfer
This program describes what conditions are needed for knowledge and skills learned in one context to be retrieved and applied to a novel situation, and how different teaching strategies can increase the possibilities for transfer. The program features a fourth-grade teacher and a seventh- and eighth-grade teacher, with commentary from Lee S. Shulman, president of the Carnegie Foundation for the Advancement of Teaching
The remote experiment position in actual taxonomy
Taxonomy is a classification effort for establishment of learning/teaching operational objectives. There are some famous taxonomies, Blooms being the most quoted. In spite of the fact that some researchers have tried to explain the position of elearning in already known taxonomies, this subject was not too much in the general attention. In the paper the authors intend to go deeply and to analyze the position of the new methodology-remote experiment-in the actual taxonomies. In addition they ha
Distributing the downturn
The International Labour Organisation has forecast a rise in unemployment by 20 million world-wide, by the end of 2009. The Organisation for Economic Co-operation and Development (OECD) has forecast a loss of up to 10 million jobs within the OECD group of countries, and up to 25 million jobs world-wide between 2008 and 2010. However, would a strategy of cutting wages as opposed to cutting jobs in the face of this recession create the conditions for economic recovery? Dr Paul Kattuman believes it
In this Design Challenge activity students will explore how structure relates to function as they design devices to save Fido.
Structural analysis of the evolution of steroid specificity in the mineralocorticoid and glucocortic
Background The glucocorticoid receptor (GR) and mineralocorticoid receptor (MR) evolved from a common ancestor. Still not completely understood is how specificity for glucocorticoids (e.g. cortisol) and mineralocorticoids (e.g. aldosterone) evolved in these receptors. Results Our analysis of several vertebrate GRs and MRs in the context of 3D structures of human GR and MR indicates that with the exception of skate GR, a cartilaginous fish, there is a deletion in all GRs, at the position corresp
The Association of Tetrameric Acetylcholinesterase with ColQ Tail: A Block Normal Mode Analysis
Acetylcholinesterase (AChE) rapidly hydrolyzes acetylcholine in the neuromuscular junctions and other cholinergic synapses to terminate the neuronal signal. In physiological conditions, AChE exists as tetramers associated with the proline-rich attachment domain (PRAD) of either collagen-like Q subunit ...
Wiggle -- Predicting Functionally Flexible Regions from Primary Sequence
The Wiggle series are support vector machine-based predictors that identify regions of functional flexibility using only protein sequence information. Functionally flexible regions are defined as regions that can adopt different conformational states and are assumed to be necessary for bioactivity. Many advances have been made in understanding the relationship between protein sequence and structure. This work contributes to those efforts by making strides to understand the relationship between p
Piecewise Linear Grapher
Highlight the language of domain and range, and the ideas of continuity and discontinuity, with this tool that links symbolic and graphic representations of each interval of a piecewise linear function.
NASA KSNN How can a pilot see the ground through clouds?
Learn more about ways that pilots use technology to see through clouds and poor weather conditions and navigate a paper path using nonverbal clues
A map of servitude.
The back of a Louisiana slave named Gordon, photographed in 1863 after he escaped to the Union forces. Whipping was the most common form of punishment on plantations, and slaveowners and overseers whipped slaves with frightening regularity. Slaves could be whipped for almost any pretext: for "not picking ...
"I Wasn't Interested In Living In The United States If I Wasn't Going To Be In The Movement:" Jack O
Jack O'Dell was one of many young black servicemen who returned from World War II determined to change conditions for African Americans at home. Along with veterans, African Americans who had participated in wartime industries and union organizing, and who had experienced improvements in pay and education, became more assertive in their demands for equality. As a member of the National Maritime Union, O'Dell participated in union organizing and challenging racial discrimination. Later, he used h
"No Other Work Available for Me and My People": A Comanche Indian Migrant Farmworker Testifies befor
In the early 20th century, large-scale commercial agriculture displaced family farms, tenant farmers, and sharecroppers. Hand labor, however, remained more cost effective for harvesting certain fruits and vegetables. Farmworkers under this new system were hired only for seasonal work and had to travel frequently. The migratory experience left these workers--primarily Mexicans, Mexican Americans, African Americans, Puerto Ricans, and Filipinos÷permanent outsiders and vulnerable to exploitation,