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analog conversion circuits are commonly available The analog signal can be amplified, so that it can drive a transducer, like a loudspeaker, in order to recreate air pressure variations, or sound The same digital-toanalog converter may, instead, drive a cathode ray tube to create pixels of varying light intensity, according to the binary digit presented to the converter When the binary digits are stored, they are kept in random access memory circuits, or else recorded as magnetic signals on a hard drive, or as optical pits on a CD-R The answer to the question: How often do I need to take measurements so as not to miss anything important was answered over 50 years ago by Harry Nyquist and Claude Shannon It turns out that ears are not sensitive to vibrations of air faster than about 20,000 cycles per second.



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There are a number of different technologies that can be used to produce devices which convert light into electricity, and we are going to explore these in turn. There is always a balance to be struck between how well something works, and how much it costs to produce, and the same can be said for solar energy. We take solar cells, and we combine them into larger units called modules, these modules can again be connected together to form arrays. Thus we can see that there is a hierarchy, where the solar cell is the smallest part (see Figure 10-1).





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'SqlCommand_DataSet2XML Imports System Imports System.IO Imports System.Data Imports System.Data.SqlClient Imports System.Xml Module Module1 Sub Main() 'Instantiate the SqlCommand object and the connection Dim objConn As New SqlConnection("Server=(local);" _ & "Database=Asset;" _ & "Integrated Security=SSPI") objConn.Open() 'prepare a data set Dim objCmd As New SqlCommand("SELECT * FROM Inventory " _ & "where InventoryId = 83 ", objConn) Dim objAdpt As New SqlDataAdapter(objCmd) Dim objDs As New DataSet("CompleteInventory") objAdpt.Fill(objDs, "Inventory")

Nyquist did the math to show that if you sample at twice this rate, ie, 40,000 cycles per second (or Hz), you are able to reconstruct vibrations of half that frequency The generalization of this, the Nyquist theorem, says that if you want to sample and reproduce things up to a certain frequency, you need to take measurements at a rate at least twice that frequency Otherwise, reconstruction is uncertain You get aliasing You can fit waves of many shapes and frequencies, not just a single unambiguous one, to the sample points you have Claude Shannon was interested in how much data could reliably get through a noisy channel of a certain capacity His work concerned error correction and coding schemes to minimize the effect of introduced noise in a transmission channel.

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His breakthrough idea was the digital representation of information, sampled at an appropriate rate, as a bit stream of the samples, coded with some redundancy to protect against corruption These two men are the fathers of digital communications Without their work, streaming digital media wouldn t be possible..

appears to be round or a square with rounded corners; you can see monocrystalline solar cells in Figure 10-2. One of the caveats with this type of method, as you will see later, is that when a silicon crystal is grown, it produces a round cross-section solar cell, which does not fit well with making solar panels, as round cells are hard to arrange efficiently. The next type of solar cell we will be looking at, also made from silicon, is slightly different, it is a polycrystalline solar cell. Polycrystalline cells are still made from solid silicon; however, the process used to produce the silicon from which the cells are cut is slightly different. This results in square solar cells. However, there are many crystals in a polycrystalline cell, so they perform slightly less efficiently, although they are cheaper to produce with less wastage. Now, the problem with silicon solar cells, as we will see in the next experiment, is that they are all effectively batch produced, which means they are produced in small quantities, and are fairly expensive to manufacture. Also, as all of these cells are formed from slices of silicon, they use quite a lot of material, which means they are quite expensive. Now, there is another type of solar cells, so-called thin-film solar cells. The difference

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