A shopping mall is a form where wide variety of product items is available. This product can be clothes, beverages, books or food any domestic product. The main intention of supermarkets is to provide availability of all the items and save the time of the purchaser but sometimes purchaser gets discontented while waiting in the queue at cash counter and sometimes they get frustrated while balancing the total price of all the products with the budget in the pocket before billing. To swamp these problems, Shopping malls use this technique as a strategy to increase the number of purchasers. In big cities, we can observe an enormous flash at shopping malls on weekends. This becomes even more when there is diversity of offers and discount. Now a day's people buy a variety of items and put them in the trolley. After total buying one should approach counter for billing purpose. By using reader the paymaster prepares the bill which is a tedious process. This results in long queues at the cash counters. This project presents an idea to develop a system in shopping malls to conquer the above problem. When purchaser puts any item in the trolley its details will be recognized automatically, the item name and rate will be displayed on the LCD Screen, thereby the rate gets joined to the final bill. If a purchaser wishes to extract the items from the smart trolley, purchaser can take away the product and the price of that particular item gets subtracted from total amount and the same information passes to the central billing unit via GSM module.

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AlxGa1-xN ultra violet light emitting diode (UV LED) has wavelength ranges from 200 to 400nm. UV light has wide range of applications from food processing, health sector, environment and security to space exploration. The energy of one photon of UV light ranges from 3.1 to 6.5 eV which is enough to raise temperature of the active region of the diode above room temperature. The issue is termed as self-heating which shrinks band gap of AlxGa1-xN semiconductor and decreases the emission efficiency of LED. Efficiency droop directly depends on thermal transport in active region of the AlxGa1-xN UV LED. Thus, thermal properties of AlxGa1-xN UV LED should be studied to explore strategies to minimize the issue. In this work we discussed heat conduction mechanism in AlxGa1-xN UV LED. The heat flow in active region is studied by solving heat flux equation in the active region for different material parameter and thermal conductivity. Our study finds that high thermal conductivity of AlxGa1-xN can minimize the self-heating issue and can improve the efficiency of AlxGa1-xN UV LED.

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