A selection of Khan academy Maths videos have been translate into Xhosa supported by the Maths depar
Chordates - CrashCourse Biology #24
Hank introduces us to ourselves by taking us on a journey through the fascinatingly diverse phyla known as chordata. And the next time someone asks you who you are, you can give them the facts: you're a mammalian amniotic tetrapodal sarcopterygian osteichthyen gnathostomal vertebrate cranial chordate. (12:10)
Full Biography: Erwin Rommel
Erwin Rommel was a highly decorated officer in World War I and was awarded the Pour le Mérite for his exploits on the Italian front. Rommel soon caught the eye of Hitler and was promoted to field marshal. In World War II, he further distinguished himself as the commander of the 7th Panzer Division during the 1940 invasion of France. However, it was his leadership of German and Italian forces in the North African campaign that established the legend of the Desert Fox. He is considered to h
Sneller klaar bundel : Allerlei opdrachten
Kinderen van het eerste leerjaar die sneller klaar zijn, kunnen zelfstandig in deze bundel werken. Er komen heel wat rekenoefeningen aan bod zoals optellen, splitsen, aftrekken, de tafel van 2 en deze van 10. Dit afgewisseld met …
Fall 2012 Capstone Presentation - Introduction
On December 13th, students from the Fall Capstone class presented their projects. Taught this semester by Prof. Gavin Shatkin, the Capstone is a required course that all Master's students in the LPP and MURP programs take in their final semester. This semester's students worked with Street-Works and the City of Quincy on a plan for the redevelopment of the Quincy Center MBTA Station.
Carolling at Memorial Church
Each year in December, Harvard's Memorial Church presents members of the University community and beyond with the gift of song.
For more than a century, the church's Harvard University Choir has performed two Christmas carol services that include readings by the clergy, and a mix of traditional and contemporary carols and hymns sung by both the choir and congregation.
Read more in the Harvard Gazette: http://news.harvard.edu/gazette/story/2012/12/a-musical-gift/
Sing, Sing, Sing
Performed by the University of Richmond Jazz Ensemble at the 2012 Cuban Spectacular. Featuring dancers Myra Daleng and Michael Whitten, Emma Phillips, '13, on drums, and Nick Yeutter, '15 on clarinet. Directed by Dr. Mike Davison.
7.1 The spectra of galaxies
The spectrum of a galaxy is the composite spectrum of the objects of which it is composed.
The optical spectrum of a normal galaxy contains contributions from stars and HII regions. An elliptical galaxy has no HII regions and has an optical spectrum that looks somewhat like a stellar spectrum but with rather fainter absorption lines. A spiral galaxy has both stars and star-forming regions, and its optical spectrum is the composite of its st
By the end of this unit you should be able to:
explain the principles that underlie the ability of hydropower to deliver useable energy;
outline the technologies that are used to harness hydropower;
discuss the positive and negative aspects of hydropower in relation to natural and human aspects of the environment.
5 Summary of unit
We have seen in this unit that, despite having a high natural abundance, iron is in very short supply because of the insolubility of its oxides and hydroxides. A result of this is that organisms have developed methods for the uptake, transport and storage of iron. Bacteria, in particular, secrete very powerful iron chelators known as siderophores. Of all the iron–siderophore complexes, the iron(III)–enterobactin complex has the exceptionally high stability constant of 1049 mol<
2.1 The problems of iron uptake
Iron has a high natural abundance. It is the second most abundant metallic element by mass in the Earth's crust (7.1 per cent).
What are the main oxidation states of iron?
4.3 Gamete production in men
A sexually mature man is producing sperm all the time at a rate of around 300–600 per gram of testis per second. This provides the 500 million or so which are released at each ejaculation. But the formation of an individual sperm takes about nine weeks (64 days). Sperm are produced in the testes, and production is most efficient at a temperature several degrees lower than the normal body temperature of 371°C. For this reason the testes (plural of testis) are suspended outside the body cavi
The rate at which water infiltrates into the ground depends on the permeability of the rocks and the state of the ground surface. Below the ground surface there is an unsaturated zone which has air in the pore spaces, and a saturated zone which has all the pores filled with water. The water table is the boundary between the unsaturated zone and the saturated zone, and is the level at which water stands in wells. Water below the water table is called groundwa
It is important to distinguish clearly between porosity and permeability. Porosity is a measure of how much water can be stored in a rock, whereas permeability is a measure of the properties of a rock which determine how easily water and other fluids can flow through it (see Section 4). Permeability depends on the exte
1 Wave energy
The energy carried by ocean waves derives from a proportion of the wind energy transferred to the ocean surface by frictional drag. So, ultimately it stems from the proportion of incoming solar energy that drives air movement. Just how much energy is carried by a single wave depends on the wind speed and the area of ocean surface that it crosses; wave height, wavelength, and therefore wave energy, are functions of the distance or fetch over which the wind blows. Not surprisingly the ma
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