Next Big Future: Maximizing Energy from Solar Panels on Slanted Roofs with kirigami shapechanging solar cells [Reblogged from ]

Researchers have shown a new way to help solar cells track the sun as it moves across the sky, which could boost a panel’s energy generation by 40 percent.

Most of the solar panels in the world sit on rooftops at a fixed angle, so they miss out on capturing energy during parts of every day. Now researchers have shown that by cutting solar cells into specific designs using kirigami, a variation of origami which entails cutting in addition to folding, they can allow the cells to track the sun’s angle without having to tilt the whole panel. This could have a substantial payoff: solar panels with tracking mechanisms can generate 20 to 40 percent more energy per year than those without trackers

As shown in the video here, applying a specific kirigamicut creates strips in a solar cell. Pulling the two ends in opposite directions causes the strips to tilt and assume a desired angle. Crucially, the structure morphs in such a way that prevents the individual strips from casting shadows on the others, and the “waviness” of the new form does not detract from performance, says Max Shtein, a professor of materials science and engineering at the University of Michigan. Shtein led the research along with Stephen Forrest, also a professor of materials science and engineering at the University of Michigan.
Kirigami structures combined with thin-film active materials may be used as a simple, low-cost, lightweight and low-profile method to track solar position, thereby maximizing solar power generation. These systems provide benefits over conventional mechanisms, where additional heavy, bulky components and structural supports are often required to synchronize tracking between panels and accommodate forces due to wind loading. By eliminating the need for such components, kirigami serves to decrease installation costs and expose new markets for solar tracking, including widespread rooftop, mobile and spaceborne installations. Kirigami-enabled systems are also cost-effective and scalable in both fabrication and materials, and similar design rules may be extended for use in a wide range of optical and mechanical applications, including phased array radar and optical beam steering.

Nature Communications – Dynamic kirigami structures for integrated solar tracking

The kirigami-based approach makes it possible to generate more electricity while using the same amount of semiconducting material, and accomplishes this to nearly the same degree that conventional tracking systems do, says Shtein. Today’s tracking systems, featured in only a small portion of the world’s solar power installations, are cumbersome and can be costly. And they function by tilting the whole panel. That doesn’t work on most pitched rooftop systems, which account for more than 80 percent of all installations


Optical tracking is often combined with conventional flat panel solar cells to maximize electrical power generation over the course of a day. However, conventional trackers are complex and often require costly and cumbersome structural components to support system weight. Here we use kirigami (the art of paper cutting) to realize novel solar cells where tracking is integral to the structure at the substrate level. Specifically, an elegant cut pattern is made in thin-film gallium arsenide solar cells, which are then stretched to produce an array of tilted surface elements which can be controlled to within ±1°. We analyze the combined optical and mechanical properties of the tracking system, and demonstrate a mechanically robust system with optical tracking efficiencies matching conventional trackers. This design suggests a pathway towards enabling new applications for solar tracking, as well as inspiring a broader range of optoelectronic and mechanical devices.

SOURCES – Nature Communications, Technology Review

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Prospects of windows 10 (Part 1: Windows Hello)

Microsoft released its much hyped and ambitious version of windows of its history last 29th July. Windows 10, according to Microsoft, is a big leap from its previous versions (Windows 8 to be specific). After the release of Windows 10 officially there has been a huge media frenzy about the event and about the OS. If you like you can also know about the Windows 10. Though in short view windows 10 may seem to be a minor visual upgrade there are many under the hood changes included in this update. I am in no means an expert in operating systems or software, but I am a big dreamer and I love to see and think about the future. So in this series of article I would like to write about what I see about the future changes windows 10 can bring through its under the hood changes.

One of the interesting under the hood changes is the inclusion of Windows Hello. Windows Hello is basically a biometric Authentication system added under the hood of Window 10. This will basically help to reduce the time Continue reading

SUST celebrates after raking 1st position in Bangladesh in webomatrics university ranking

ওয়েবমেট্রিক্স এর ফাইজলামি এবং শাবিপ্রবির নাচানাচি

দুই দিন আগে ফেসবুকে হঠাৎ করে একটা নিউজ নজর কারল। নিউজের হেডলাইনটি ছিল হুবহু এই রকম “দেশসেরা শাহজালাল বিজ্ঞান ও প্রযুক্তি বিশ্ববিদ্যালয়” এর সাথে নিচে স্নিপেটে লেখা “ঢাকা বিশ্ববিদ্যালয় কিংবা বাংলাদেশ প্রকৌশল বিশ্ববিদ্যালয় (বুয়েট) নয়, বাংলাদেশের বিশ্ববিদ্যালয়গুলোর র‌্যাঙ্কিংয়ে এবার প্রথম হয়েছে শাহজালাল বিজ্ঞান ও প্রযুক্তি বিশ্ববিদ্যালয়।”  এই রকম একটি নিউজ দেখে প্রথমেই একটা খটকা লাগল।

যদিও আমি শাহজালাল বিজ্ঞান ও প্রযুক্তি বিশ্ববিদ্যালয়ে পড়াশোনা করি, একটা বিষয় স্বীকার করতে কখনো দিধা বোধ করি না, বুয়েট এখনো বাংলাদেশের সেরা বিশ্ববিদ্যালয় । এমন না যে আমার ইনফিরিওরিটি কমপ্লেক্স আছে, যা সত্য তা বলতে হবে।

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smartercities: These Smart Umbrellas Measure Rainfall Data For…


These Smart Umbrellas Measure Rainfall Data For Meteorologists (And Send It Back To The Cloud) | FastCompany

A team of Dutch scientists wants to use the crowd instead, by turning umbrellas into mini weather-monitoring stations. Every time it rains, smart umbrellas would use sensors to detect falling drops, and then use Bluetooth to send a report to a smartphone app. As people walk around with umbrellas throughout a city during a storm, each app would send in data to a central system where meteorologists could use it to come up with better predictions.


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