Wednesday, 3 October 2012

How to customize Windows 7 Login

How to customize Windows 7 Login

How to customize Windows 7 Login.Windows 7, on the other hand, has the ability to change the logon screen built into it. Well sort of, the functionality exists to make it easy for OEMs to include their custom branding, but nothing stops you to take advantage of it. In this article we shall first look into how you can change the logon screen manually and then we will point you towards some tools that make the job easier and add even more feature rich. So let’s get started.


Its is always nice to know how things work behind the scenes, what better way to do so then try them out yourself. To change the logon screen manually follow these steps:
  1. Fire up registry editor (Win Key + R and then type regedit, hit enter)
  2. Browse to
    HKY LOCAL MACHINE /Software/Microsoft/Windows/CurrentVersion/Authentication/
    , double click on key named OEMBackground and change its value to 1 (If you cannot find the path or the key go ahead and create it, remember OEMBackground is a Dword)
  3. You just enabled the OEM Background functionality. Now browse to the folder
    within Windows explorer. %windir% refers to your Windows install directory
    in most systems. Again the folder path may not exist already, so you can go ahead and create required folders (info and backgrounds are generally not present)
  4. Now put in any JPG file with size less than 256 kb in this folder and rename it to backgroundDefault.jpg. This file will be stretched to fit the screen, so you would want it to match the resolution of your screen so that image doesn’t look bad. You can something like or Photoshop’s Save as/Save for Web feature to reduce image size.

Using Tools

Check out Logon Changer from , that lets you choose a image file to use as your logon background. That all what you do, just choose an image and Logon Changer will take care of everything else including the file size limit. It also makes it super easy to revert back to the default Logon Screen.
Windows 7 Logon Screen Rotator  – takes the logon screen customization one step further by allowing you to select a set of images. It will then randomly use one of these images as the logon screen.
There you have it. Using any of the above method you can easily change Windows 7 logon screen to any wallpaper of your choice or that witty one liner graphic you created yourself or perhaps even one of your photos as long as they meet the requirements. Let us know your experience of using these methods and we would love to see what you have as your logon screen. Mention them in comments!

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Tuesday, 2 October 2012

Measurement by Vernier Callipers

How to measure by Vernier Calipers 

Many of you science students may have seen Vernier Caliper.... somthing like this...
The thing that we are now concerned wiyh is the two scales, so the picture stands as following...
If you are having problem download the picture and magnify it to have a clear view.
You can clearly see that it consists of two parallel scales- 
1. Main Scale:- This is the upper scale in the image. This scale is similar to a ruler. Again each unit in this scale is divide into ten decimal points, that is, ten subdivisions to measure the 1/10 th points in a unit.
2. Vernier Scale or Secondary Scale:- This is obviously the most important scale as the name suggests and this is where the cleverness of Mr. Vernier lies. As the image suggests, this scale has ten divisions which is equal to 9 subdivisions of each unit in the main scale.
From the above discussions, it is clearly evident that the exact spacing between each mark in the vernier scale is exactly 0.09 units of the main scale. (As for 10 units in vernier scale, there are 0.9 units in the main one....
therefore for 1 unit in a main scale, there will be 0.9/10= 0.09 units.)
Therefore it is evident that when the 0 of vernier scale is displaced from the 0 of the main scale, then atleast one mark will be closest or perfectly match with a mark on the main scale.
Take the following image as an example:

Here the zero is moved to somewhere between 0.3 and 0.4 in the main scale, so the measurement is 0.3something. 
Now just think about it... in its initial position, zero of vernier and zero of main was exactly matching, but the '1' in the vernier was moved away 0.09 units away from 0.0. From the Fig.2, it can be seen that the nearest mark in the main scale of the vernier mark '1' is '0.1'. Since the spacing between each mark in the vernier scale is 0.09 and of main scale is 0.1, so vernier '1' is away from main '0.1' by 0.01 units (0.1-0.09). Similarly the 2 of vernier is 0.08 units away from 0.2 of main scale and so on.
You can notice that after 10 such repeatations, vernier's 10 will obviously match with 0.9 of main. This is because between each mark in the main scale, if we divide them in 10 equal divisions, then according to the figure, the space between the '0.n' th reading in the main scale and the 'n'th reading in the vernier scale will be 0.0n (where 'n' is any whole number). For example, the distance between 0.8 in the main scale and 8 in vernier scale will be 0.08. 
Therefore, the space is decreasing by 0.01,
so after 10 such repeatations, the vernier mark will get back from main scale by (0.01x10=) 0.1.
Thus, at 10 it will match with (1.0-0.1=) 0.9.
Now, when the vernier scale is moved, atleast one vernier mark will match with a mark in the main scale, this is because every mark in vernier is backed from its corresponding main scale mark by 0.01 times of that vernier mark, and this continues for every number from 0 to 9. This is a bit difficult to understand. This simply means that the space between the vernier mark and its corresponding mark are 0 and all the first 9 multiples of 0.01, . So, when the vernier scale is moved, atleast one mark in vernier will cross atleast 0.01 units. 

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