Stirling Engines, not very popular, but really promising engines. Check out the features.  Closed cylinder engine No Combustion and noise Works on heat exchange Any heat source can power the engine Most efficient of all engines Low Maintenance Most suitable for solar concentrators This is a very simple but feasible and effcient technology, yet relatively untapped, why ? I can see only one reason. The Energy Lobby. Stirling engines...

The google page rank is one of the most discussed topics in the SEO world. The PR of a page is a measure of the importance of a page. How does google calculate PR ? PR of a page is very much dependent on the number of pages referring to that page. Exactly the same way humans also rank other humans. One person is a great person if more people knows him. A page with reference from 10000 pages is a good page, similarly a person who...

Where ever you hear the name gateway, assume that we are talking about external connectivity. SMS gateway is used to provide SMS connectivity to third parties or solve protocol incompatibilities. The SMSC is a part of the operators SS7 network. The SMS gateway is connected to the SMSC. In most cases the SMSC has inbuilt gateways. Any external connection from a network other than the SS7 network is handled through the gateway. One...

Finally the picture is mine. Took me 30 mins. BTS – Base Transceiver Station (Antenna) BSC – Base Station Controller MSC – Mobile Switching center HLR- Home Location Register VLR – Visitor Location Register SMSC – Short Message Service Center When a user sends an SMS, the request is placed via the MSC. The MSC forwards the SMS to the SMSC where it gets stored. The SMSC queries the HLR to find out...

Sorry for the bad heading. Suggest me a good heading after reading the concept. Today I met a non tech person with a lot of ideas and this is one of his idea. We all now have operator provided sim cards. His idea is to eliminate the concept of a personal mobile.  One must be able to LOGIN to any mobile and use his connection. A concept very similar to email where we can use any computer or any internet service provider to access...

Unstructured Supplementary Services Data (USSD) is a GSM service that allows high speed interactive communication between the subscribers and applications across a GSM Network. A sample USSD service is the bill status service accessed by dialing *141# or similar numbers in between * and #. USSD applications can be thought of as an IVRS (Interactive Voice Response System) with out voice. Some of the USSD applications that we use...

The story of a man who chased a dream. Not every one dares to do it, but if you have a dream, chase it, if you can afford a chase. And how do you decide whether you can afford, well… its fully upto you. Once you start chasing people might discourage you, laugh at you, and do all sorts of things to stop you. When you are near your goal people may try to buy you out, and above all you may fail many times.  all these are shown...