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Suppose you have two big, flat metal plates, both of which are excellent electrical conductors Imagine that you stack them one on top of the other, with only air in between If you connect a source of dc across the plates (Fig 14-2), the plates will become electrically charged, and will reach a potential difference equal to the dc source voltage It won t matter how big or small the plates are; their mutual voltage will always be the same as that of the source, although, if the plates are huge, it will take awhile for them to become fully charged Once the plates are fully charged, the current will drop to zero If you put some insulating material, such as glass, between the plates, their mutual voltage will not change, although the charging time will increase If you increase the source voltage, the poten-

The Title entity contains both the Album and the Track titles. Because in SQL Server 2005 it s not possible to specify a union XPath expression, the two sets must be merged into one using the T-SQL UNION clause. Using the union XPath expression, the query could be simplified as shown in listing 5.

xmlnamespaces ( 'http://www.w3.org/2001/XMLSchema-instance' as xsi ,'http://schemas.milambda.net/Music' as m ,'http://schemas.milambda.net/Music-Album' as ma ) Discography.Album.query ('

Press z-K or click the Compile button to compile the script, and AppleScript Editor indents the continued line to the next level so that you can more easily see that it is continued:

tial difference between the plates will follow along, more or less rapidly, depending on how large the plates are and on what is between them If the voltage is increased without limit, arcing will eventually take place That is, sparks will begin to jump between the plates

data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) as Title @xml.nodes (' /ma:discography/ma:album | /ma:discography/ma:album/ma:track ') Discography (Album)

xmlnamespaces ( 'http://www.w3.org/2001/XMLSchema-instance' as xsi ,'http://schemas.milambda.net/Music' as m ,'http://schemas.milambda.net/Music-Album' as ma ) Discography.Album.query (' data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) as Title ,Discography.Album.query (' data(@ma:published) ').value ( '.' ,'datetime' ) as Published from @xml.nodes (' /ma:discography/ma:album ') Discography (Album)

So far, the script opens a Finder window, resizes and repositions it, changes the view, and then displays the contents of another folder Now let s make the script open TextEdit, create a new document, add some text to it, and save it automatically To find the commands needed, we ll open the AppleScript dictionary file for TextEdit

Now, imagine that the voltage source connected across the plates is changed from dc to ac (Fig 14-3) Imagine that you can adjust the frequency of this ac from a low value of a few hertz, to hundreds of hertz, to many kilohertz, megahertz, and gigahertz At first, the voltage between the plates will follow just about exactly along as the ac source polarity reverses But the set of plates has a certain amount of capacitance Perhaps they can charge up fast, if they are small and if the space between them is large, but they can t charge instantaneously As you increase the frequency of the ac voltage source, there will come a point at which the plates do not get charged up very much before the source polarity reverses The charge won t have time to get established with each ac cycle At high ac frequencies, the voltage between the plates will have trouble following the current that is charging and discharging them Just as the plates begin to get a good charge, the ac current will pass its peak and start to discharge them, pulling electrons out of the negative plate and pumping electrons into the positive plate

xmlnamespaces ( 'http://www.w3.org/2001/XMLSchema-instance' as xsi ,'http://schemas.milambda.net/Music' as m ,'http://schemas.milambda.net/Music-Album' as ma ) Discography.Track.query

To find out the AppleScript verbs, classes, and properties you need to control an application, you open the application s AppleScript dictionary The dictionary explains the AppleScript structure of the application and how to use it You can open an application s dictionary file in either of two ways:

(' data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) as TrackTitle ,Discography.Track.query (' data(@ma:trackNumber) ').value ( '.' ,'int' ) as TrackNumber ,Discography.Track.query (' data(parent::ma:album/@ma:title) ').value ( '.' ,'nvarchar(450)' ) as AlbumTitle ,Discography.Track.query (' data(parent::ma:album/@ma:published) ').value ( '.' ,'datetime' ) as Published from @xml.nodes (' /ma:discography/ma:album/ma:track ') Discography (Track)