5.12 Organic Chemistry I (MIT)
5.12 is an introduction to organic chemistry, focusing primarily on the basic principles to understand the structure and reactivity of organic molecules. Emphasis is on substitution and elimination reactions and chemistry of the carbonyl group. The course also provides an introduction to the chemistry of aromatic compounds.
Interactive model of the tetragonal structure of ZrO2
Interactive, rotatable model of the tetragonal structure of ZrO2.
Model of the cubic Fluorite structure of ZrO2
Rotating model of the cubic Fluorite structure of ZrO2.
Structures and materials : section 4 behaviour of materials : presentation transcript
This is a presentation transcript for Structures and Materials : Section 4 : behaviour of materials. It introduces the behaviour of materials by introducing the stress-strain curve. The concepts of elastic and plastic deformation are covered. This leads to a discussion of the micro-structure of materials and a physical explanation of what is happening to a polycrystalline material as it is loaded to failure. This open educational resource was released through the Higher Education Academy Engi
9.011 The Brain and Cognitive Sciences I (MIT)
Survey of principles underlying the structure and function of the nervous system, integrating molecular, cellular, and systems approaches. Topics: development of the nervous system and its connections, cell biology or neurons, neurotransmitters and synaptic transmission, sensory systems of the brain, the neuro-endocrine system, the motor system, higher cortical functions, behavioral and cellular analyses of learning and memory. First half of an intensive two-term survey of brain and behavioral s
6.973 Organic Optoelectronics (MIT)
The course examines optical and electronic processes in organic molecules and polymers that govern the behavior of practical organic optoelectronic devices. Electronic structure of a single organic molecule is used as a guide to the electronic behavior of organic aggregate structures. Emphasis is placed on the use of organic thin films in active organic devices including organic LEDs, solar cells, photodetectors, transistors, chemical sensors, memory cells, electrochromic devices, as well as xer
Bi 60, Cd 40 (wt%), eutectic alloy
This sample has the eutectic composition so all the liquid solidifies at the eutectic temperature to form a lamellar eutectic structure. The two phases grow co-operatively from the melt.
Zinc thiourea sulphate (ZTS) structure
The micrograph shows zinc thiourea sulphate (ZTS) structure in dielectric ceramic
The micrograph shows dendrite structure of a copper-phosphorus alloy, 400 microns
Al 67, Cu 33 (wt%), eutectic alloy
This SEM image shows the lamellar eutectic very clearly. The interlamellar spacing is about one micron. There are several imperfections in the lamellar structure, which have arisen from irregularities and disturbances during growth.
Microwave dielectric ceramics system 1-1-4
The micrograph shows structure of a BaO-Nd2O3-4TiO2 ceramics, 400 microns
How Individual Rights Transformed World Politics
Have individual rights transformed world politics? Prof. Reus-Smit challenges the circumscribed nature of this debate, arguing the relationship between individual rights and world politics has a longer history and is more fundamental than it suggests. Have individual rights transformed world politics? Debate on this question has focused to date on the efficacy, or lack thereof, of the international human rights regime. Prof. Reus-Smit challenges the circumscribed nature of this debate, arguing t
Fe, C 0.2 (wt%), explosively deformed - mechanical twins
This sample was explosively deformed so that there was insufficient time for dislocation motion to occur. Hence, mechanical twins are produced despite the b.c.c. structure of mild steel.
Virtual yeast cell
This rich learning object is used to introduce yeast cytology to students taking Module D24BS3 Brewery Yeast Management as part of the MSc in Brewing Science. The virtual cell permits the students to understand structure and function of yeast organelles.
Conservation and biodiversity
Dr. Richard Field research interests lie in conservation, biodiversity and the forces that structure ecological communities. In this podcast, Dr Field from the School of Geography compares and contrasts his experiences as a researcher in national parks in Honduras and Indonesia, and the different types of ecological communities he has studied, and goes on to introduce the emerging field of conservation bio-geography.
Enhancing Physics Knowledge for Teaching – Atoms and Light
In this session we shall look at how light interacts with atoms. This will enable us to determine the internal structure of atoms and also the quantum behaviour of light.
TALAT Lecture 2710: Static Design Example
Example of structure design of the industrial building developed with the Mathcad software.
FOAMCARP closed cell aluminium foam
Additions such as SiC are made to molten aluminium or aluminium alloy to modify the melt viscosity and make it suitable for foaming. Calcium carbonate is then added to the melt which is solidified to form a precursor which can be foamed in a controlled manner by a subsequent heat treatment. The resulting foam has a fine and relatively uniform cell structure.
Cu 55, Zn 45 (wt%) brass, as cast, dendritic
A cast alloy of high zinc brass, consisting of β dendrites. The α precipitates out of solution at the crystal boundaries, forming a structure of β dendrites surrounded by α. This is known as a Widmanstätten structure because a geometrical pattern of α forms on certain crystallographic orientations of the β lattice.
High magnification SEM image of open cell polyurethane foam
If a gas is injected into a liquid it forms a cellular foam structure. When a thermoset prepolymer of low viscosity is foamed, the polymer can drain from the cell walls (driven by surface tension) before it sets at the cell edges, leaving an open-celled foam. The cell edges have three concave sides, and some remnants of collapsed cell walls can be seen at the cell edges.