Brass, exhibiting grain boundary nucleation
A high zinc brass that forms large grains of β phase (yellow areas, due to higher copper content) and subsequently grains of γ form on β grain boundaries and also on non-metallic inclusions in the alloy.
Pearlitic malleable cast iron
A cast iron with a relatively low carbon content. Upon cooling the austenite transforms to pearlite at the eutectoid temperature, leaving a microstructure of pearlite and graphite.
6.021J Quantitative Physiology: Cells and Tissues (MIT)
In this subject, we consider two basic topics in cellular biophysics, posed here as questions:
Which molecules are transported across cellular membranes, and what are the mechanisms of transport? How do cells maintain their compositions, volume, and membrane potential?
How are potentials generated across the membranes of cells? What do these potentials do?
Although the questions posed are fundamentally biological questions, the methods for answering these questions are inherently multidisc
Bone china (with sensitive tint plate)
China clay consists mainly of SiO2 and Al2O3, and is valued for its whiteness (which is due to the low iron oxide content). Bone consists mainly of hydroxyapatite, Ca5(PO4)3OH, and the source supply is mainly ox bone.
Brass, exhibiting grain boundary nucleation
A high zinc brass that forms large grains of β phase (yellow areas, due to higher copper content) and subsequently grains of γ form on β grain boundaries and also on non-metallic inclusions in the alloy.
7.349 Biological Computing: At the Crossroads of Engineering and Science (MIT)
Imagine you are a salesman needing to visit 100 cities connected by a set of roads. Can you do it while stopping in each city only once? Even a supercomputer working at 1 trillion operations per second would take longer than the age of the universe to find a solution when considering each possibility in turn. In 1994, Leonard Adleman published a paper in which he described a solution, using the tools of molecular biology, for a smaller 7-city example of this problem. His paper generated enormous
Mini project : 3D graphics and visualisation : presentation transcript
This is a Mini Project presentation about 3D graphics and visualisation. It is part of the 2009/10 BSc in Games & Graphics Hardware Technology (course number 2ELE0074) from the University of Hertfordshire. All the mini projects are designed as level two modules of the undergraduate programmes.
The project involves developing a simple system which will allow students to understand the process and the main parameters involved in creating 3D visualization content for games and various applicatio
As cast white cast iron
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite dendrites and ledeburite. The dendrites then transform to pearlite, and the ledeburite to ferrite and cementite.
Dual-phase steel water quenched from 800°C
The steel sample with composition same as above was quenched from 800°C. The microstructure shows higher volume fraction of martensite. The martensite is appearing as the same straw-coloured entities. The straw tint is not influenced either by martensite size or its C-content. The retained austenite is appearing as bright white fine particles associated mostly with martensite.
White cast iron, subject to slow heating and cooling treatment
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite and subsequently graphite. Upon reaching the eutectoid temperature the austenite transforms to pearlite, giving a final microstructure consisting of graphite in a pearlite matrix.
White cast iron, subject to slow heating and cooling treatment
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite and subsequently graphite. Upon reaching the eutectoid temperature the austenite transforms to pearlite, giving a final microstructure consisting of graphite in a pearlite matrix.
Silal
This sample shows the typical structure of silal, irons with high Si content (5.5-7.9 wt%). It is a grey cast iron alloyed with 4-6wt% Si to provide good oxidation resistance. The high Si content forms a dense, adherent iron silicate surface film, which is resistant to oxygen penetration. The flake graphite iron Silal was one of the first heat resisting cast irons developed. Spheroidal graphite Si irons have higher strength and improved ductility. The structure shows cored dendrites of ferrite w
Silal
This sample shows the typical structure of silal, irons with high Si content (5.5-7.9 wt%). It is a grey cast iron alloyed with 4-6wt% Si to provide good oxidation resistance. The high Si content forms a dense, adherent iron silicate surface film, which is resistant to oxygen penetration. The flake graphite iron Silal was one of the first heat resisting cast irons developed. Spheroidal graphite Si irons have higher strength and improved ductility. The structure shows cored dendrites of ferrite w
As cast white cast iron
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite dendrites and ledeburite. The dendrites then transform to pearlite, and the ledeburite to ferrite and cementite.
Grey cast iron
Cast iron with a high carbon content is referred to as grey cast iron since the carbon is present in the form of graphite flakes giving rise to a grey colour when viewed. This form of cast iron has several technologically useful properties such as good machinability, low melting temperature, good wear resistance and good mould reproduction.
Silal
This sample shows the typical structure of silal, irons with high Si content (5.5-7.9 wt%). It is a grey cast iron alloyed with 4-6wt% Si to provide good oxidation resistance. The high Si content forms a dense, adherent iron silicate surface film, which is resistant to oxygen penetration. The flake graphite iron Silal was one of the first heat resisting cast irons developed. Spheroidal graphite Si irons have higher strength and improved ductility. The structure shows cored dendrites of ferrite w
White cast iron, subject to slow heating and cooling treatment
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite and subsequently graphite. Upon reaching the eutectoid temperature the austenite transforms to pearlite, giving a final microstructure consisting of graphite in a pearlite matrix.
Bone china, showing the glaze on the surface (with sensitive tint plate)
China clay consists mainly of SiO2 and Al2O3, and is valued for its whiteness (which is due to the low iron oxide content). Bone consists mainly of hydroxyapatite, Ca5(PO4)3OH, and the source supply is mainly ox bone. The glaze is mostly SiO2, and is applied to render the surface impermeable to liquids and gases, to provide a readily cleanable surface which protects the china, and to provide an aesthetically pleasing coating.
As cast white cast iron
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite dendrites and ledeburite. The dendrites then transform to pearlite, and the ledeburite to ferrite and cementite.
As cast white cast iron
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite and subsequently graphite. Upon reaching the eutectoid temperature the austenite transforms to pearlite, giving a final microstructure consisting of graphite in a pearlite matrix.
