3.4 Penetration depth The characteristic length, λ, associated with the decay of the magnetic field at the surface of a superconductor is known as the penetration depth, and it depends on the number density ns of superconducting electrons. We can estimate a value for λ by assuming that all of the free electrons are superconducting. If we set ns = 1029 m−3, a typical free electron density in a metal, then we find that
1.8.2 Interpretation of a geological exposure We now want to make use of the observations obtained by sketching the exposure, and it is useful to start by briefly summarising the features seen. First of all, you probably noticed the large boulder in the foreground of Figure 16 (which has been attached below for ease of access). Where did this boul
Introduction This unit explores origins of the Universe by looking in detail at events immediately following the Big Bang. Starting with looking at the cooling of the very early Universe, the unit then moves on to the inflation era, the quark-lepton and the hadron era. Then the unit looks at how fundamental particles began to synthesise to form nuclei, and from here it discusses the development of larger structures like stars and galaxies. By examining closely the forces in play and the interactions of fu
3.3.3 Committee stage At this stage a detailed examination of each clause of the Bill is undertaken by a committee of between 16 and 50 MPs. The committee subjects the Bill to line-by-line examination and makes amendments. The committee which carries out these discussions comprises MPs representing the different political parties roughly in proportion to the overall composition of the House of Commons. There will therefore be a Government majority on the committee. However, an attempt is made to ensure representat
4.2.2 Private reports (1535–1865) These reports bear the name they do because they were produced by private individuals and are cited by the name of the person who collected them. They were, however, published commercially for public reference. An ongoing problem with the private reports relates to their accuracy. At best, it can be said that some were better, that is, more accurate, than others. Of particular importance among the earlier reports were those of Plowden, Coke and Burrows, but there are many other reports that a
1.3.4: Calculating means using frequencies and calculating weighted means In some situations, various values in the batch get repeated (there may be a limited number of different values that can occur, for example). It can be simpler to group the data and record the number of times with which each different value occurs. The number is called the frequency. The following example explores this possibility and comes up with an equivalent formula for calculating the mean of the batch. 1.4.1 Try some yourself 1 Convert each of the following fraction ratios to decimal ratios. (a) 1.4 Converting ratios from fractions to decimals Although ratios are often given as fractions, they can also be expressed as decimals. You need to deal with a mixture of fractions and decimals, and to compare ratios given in either form, so you need to be able to convert between the two forms. The ratio of the circumference of a cir 1.3 Using ratios Time conversions are also ratios. The ratio of time measured in minutes to time measured in seconds is one to sixty (1:60), as there are sixty seconds in a minute. Adam's grandfather ran a mile in 1.2.1 Try some yourself 1 A friend is painting the inside walls of a garage. So far she has used a 2 litre tin of emulsion paint and covered an area of 9 m2. She needs some more paint. How much more would you advise her to purchase if she intends to pa 1.2 Expressing ratios To make short crust pastry, one recipe book says ‘use one part of fat to two parts of flour’; another recipe says ‘use fat and flour in the ratio of one to two’; and yet another says ‘use half as much fat as flour’. These are different ways of expressing the same ratio. Ratios are often expressed as fractions. So in this case: 2.3 Paper-and-glue constructions In this section we show how to construct surfaces by taking a piece of paper in the shape of a polygon and gluing some of its edges together. The surfaces that we obtain occupy a central position in this unit, as you will see. Studying Darwin Theologians in Conversaton; The Temple and the First Christians Earthquake and Fault line Model Topic 7: Public Goods and Externalities Part 2 | Econ2450A: Public Economics SPC Fall 2012 Graduation - 1:00 p.m. Ceremony The Tooth
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This unit brings together a collection of units from the OpenLearn site that would be of interest to anyone wishing to study Darwin’s theory of evolution and natural selection and how his work has gone on to influence other work around this theory. First published on Tue, 04 Dec 2012 as Author(s):
Margaret Barker and Tom O'Loughlin discuss the significance that the first followers of Jesus attached to the temple in Jerusalem, and how the imagery of the temple played a role in their developing understanding of Jesus and of their own identity.
Caro Begg demonstrates how to make a simple mechanical model to simulate faults, earthquakes and aftershocks. For primary or intermediate level. (03:40)
Raj Chetty
Fall 2012
http://www.youtube.com/user/StPetersburgCollege
SPC Fall 2012 Graduation - 1:00 p.m. Ceremony
About St. Petersburg College:
In 1927, St. Petersburg College (then known as St. Petersburg Junior College) became Florida's first private, non-profit, two-year school of higher learning located in downtown St. Petersburg. Full accreditation followed in 1931 and in 1948 SPC became a public college.
In June 2001, SPJC officially became St. Petersburg College when Florida's governor signed legislati
Listen to Annette Bening read The Tooth by Avi Slodovnick. Pictures by Manon Gauthier. The original illustrations are also shown. (04:54)
