Driving home, I was thinking fondly of dinner when I turned on the radio and rolled down the window. There was no music to be had, only the Quranic verses that I knew preceded the announcement of the names of the dead for today.

At the end of construction, these cranes had to be disassembled and brought down by elevator. When the towers were finished, each one would have 97 passenger elevators, capable of carrying loads of up to 10,000 pounds at speeds of up to 1,600 feet per minute. In all, the towers were assembled from more than 200,000 pieces of steel manufactured around the country, 3,000 miles of electrical wiring, 425,000 cubic yards of concrete, 40,000 doors, 43,600 windows and six acres of marble.

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Cleaning Dubai's Burj Khalifa is no easy task. It involves a lot of effort, planning and high-end safety gear to execute. Behind the building's magnificent sheen is a team of expert window cleaners who climb the skyscraper and clean the building for three months at a time.In a video shared on Twitter, Burj Khalifa shared a quick glimpse into how their window cleaning heroes get the job done.This isn't your regular window cleaning gig, though.???? ????? ?? ????? ????? ??????? ?? #???_?????

Tighten your harness and learn about our window cleaning heroes at #BurjKhalifa pic.twitter.com/RjqaTCCnvD- Burj Khalifa (@BurjKhalifa) January 23, 2019One of the interesting things the Burj Khalifa window cleaners do before they proceed with their work is lock their high-tension ropes onto a structure to ensure their safety as they rappel down the side of the building.Once that is done, the window cleaners then check wind speed using a portable device.The wind determines whether or not cleaners will be deployed.According to the video, if its around 12 knots, cleaners will check the speed to ensure that water doesn't splash all over the windows. Once they reach the ground, the team takes another lift all the way back to the top of the Burj and immediately repeats the process of washing.The window cleaning team take 3 months to completely wash the Burj Khalifa's windows. They are deployed four times every year to ensure that the world's tallest building remains pristine.

In this paper we present a prototype for a spectrum sensing node for a cognitive radio sensing network. Our prototype consists of a custom down-conversion front-end with an RF input frequency range from 300 MHz to 3 GHz and a Power Spectral Density (PSD) estimation algorithm implemented on a Virtex-6 Field Programmable Gate Array (FPGA). The base-band processing part is capable of calculating the PSD for a bandwidth upto 245.76 MHz achieving a resolution of 60 kHz and an online variable averaging functionality with a maximum of 32767 averages. Real time performance and calculation of the PSD for real world signals in the GSM downlink, DECT and the UHF DVB-T bands is demonstrated. be457b7860

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