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Power-over-Wi-Fi: Indian origin scientist develops Wi- Fi based system to power cameras

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Washington: An Indian-origin researcher Vamsi Talla has developed a system, that uses Wi-Fi internet signals to beam power to remote devices such as a surveillance camera.

The system is first of its kind and is known as power-over-Wi-Fi.

The idea is simple in concept. Wi-Fi radio broadcasts are a form of energy that a simple antenna can pick up.

Until now, Wi-Fi receivers have all been designed to harvest the information that these broadcasts carry.

Talla simply connected an antenna to a temperature sensor, placed it close to a Wi-Fi router and measured the resulting voltages in the device and for how long it can operate on the remote power source alone.

Even more ambitiously, the team also connected a camera to their antenna.

This was a low-power sensor capable of producing 174 x 144 pixel black and white images, which requires 10.4 milliJoules of energy per picture.

To store energy, they attached a low leakage capacitor to the camera which activates when the capacitor is charged and continues operating until the voltage drops to 2.4 Volts.

The images were stored in a 64 KB random access memory (RAM). In the subsequent tests, the camera performed remarkably well.

“The battery-free camera can operate up to (about five metres) from the router, with an image capture every 35 minutes,” Talla told MIT Technology Review.

By adding a rechargeable battery, he increased the distance to seven metres.

The router could even power the camera through a brick wall, demonstrating that it would be possible to attach the device outside while keeping the power supply inside.

“The technology would be hugely useful for surveillance, perhaps connected to a movement sensor to trigger the camera when something moves in its field of view,” Talla noted.

The team also connected their antenna to a Jawbone fitness tracker and used it to recharge the battery that powered it.

“Using this, we charge a Jawbone device in the vicinity of the power-over-Wi-Fi router from a no-charge state to 41 percent charged state in 2.5 hours,” the team pointed out.

According to the MIT report, power-over-Wi-Fi could be the enabling technology that finally brings the “Internet of Things” to life. (IANS)

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Vivah Panchami: Celebration of Marriage between Lord Ram and Goddess Sita

Vivah Panchami is a Hindu festival that celebrates the wedding of Lord Ram and Goddess Sita.

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The Vivah Mandap temple
The Vivah Mandap temple where Lord Rama and Sita are said to have been married. It is situated next to the Janki Mandir. Ram Tower is located to the south of Ram Temple. It was inaugurated by former Prime Minister Mr Sushil Koirala. Wikimedia Commons

Vivah Panchami is a Hindu festival that celebrates the wedding of Lord Ram and Goddess Sita. It is celebrated on Shuklapaksha Panchami, which is the fifth day of the month of Margashirsha according to Hindu calendar. In 2017, the festival was celebrated on 23rd November.

In Ramayana, it was on this day (Vivah Panchami) that Lord Ram; the eldest son of King Dashrath of Ayodhya, the reincarnation of Lord Vishu got married to Goddess Sita. Vivah Panchami festival celebrates the union between these two divine beings.

Legend:

According to the legends, it was on this day that Lord Ram along with his brother Lakshman visited Jankpur, the birthplace of Goddess Sita. In the Kingdom of Mithila, King Janak had organized the ceremony of ‘Swayamvar’ for his daughter Sita. In this ceremony, the Goddess was supposed to choose her groom. The condition for winning the Swayamvar, however, was decided on contender’s ability to lift a the majestic bow of Lord Shiva string it. Lord Ram not only managed to raise the bow but he also broke it and thus fulfilled the condition and married Sita. According to Ramayana, during this grand marriage ceremony other the brothers of Lord Ram like Lakshman, Bharat and Shatrughan were also married to Sita’s cousins called Urmila, Mandavi, and Shuddhakirti respectively.

Celebrations on Vivah Panchami:

Vivah Panchami is celebrated with great enthusiasm in the city of Ayodhya, the birthplace of Lord Ram and Mithilanchal region in India as well as in Janakpuri in the Nepal. At Ayodhya, the devotees try to recreate the wedding ceremony by decorating the idols of Ram and Sita with bridal clothes and jewellery. This celebration is also popularly referred to as ‘Ram Vivah Utsav.’ Ramleela, a dramatic folk enactment of Lord Ram’s life is also performed at various places depicting the marriage ceremony between Lord Ram and Sita.

Vivah Panchami also has a great significance in the region of Janakpuri (in Nepal) as it believed to be the place where the marriage ceremony took place. Many devotees visit the place from India to Nepal to worship Lord Ram and Goddess Sita and celebrate their union. People seek the blessing from these idols of Ram and Sita to live a happy married life. It is also a firm belief among the devotees that worshipping Lord Ram and Sita on this day will help them deal with their marital woes and strengthen their union.

 

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