The business model that is outrageous these days

Massive Open Online Courses(MOOC) are pretty common nowadays. Knowledge can be shunned easily without going to any formal institute and best of all in one’s own timing. One of the Most popular MOOC is EDX whose motto is “Free online courses from the world’s best universities”. I was following EDX from its beginning as it was basically founded by MIT and Harvard, two of the most prominent institute in the USA and also have collaboration with other universities. Initially, it offered courses completely free, but as days passed the introduced Verified courses for a small fee and today there are courses that are not actually free. But you will actually need to pay money for registering some course. This caught me thinking about their operating model. Isn’t that what we Continue reading


ইলেকট্রনিক্স : রেসিস্টর

রেসিস্টর (resistor/ রোধক) ইলেকট্রনিক সার্কিটে সবচেয়ে ব্যবহৃত কম্পোনেন্ট। রেসিস্টর সম্পর্কে আড়ও জানতে এই লিঙ্কেররোধক আর্টিকেলটি পড়তে পারেন। রেসিস্টরের ইলেক্ট্রিকেল সিম্বল বা চিহ্ন হল


রেসিস্টর অনেক ধরনের হতে পারে। আমার এই আর্টিকেল সিরিজ যেহেতু বেসিক ইলেক্ট্রনিক্স নিয়ে, আমি ইলেক্ট্রনিক্স এর কাজের সাথে সম্পৃক্ত রেসিস্টরগুলো নিয়ে মূলত আলোচনা করব। এই আর্টিকেলে আমি শুধু স্থির রেসিস্টর সম্পর্কে আলোচনা করব। স্থির রেসিস্টর গঠন অনুযায়ী অনেক ধরনের হয়ে থাকে। ইলেক্ট্রনিক্স এর কাজে আমরা যে ধরনের স্থির রেসিস্টর বেশি ব্যবহার করি সেটা হল কার্বন রেসিস্টর যা দেখতে অনেকটা এরকম ।

Carbon Resistor

Carbon Resistor

আরেক ধরনের রেসিস্টর যা অনেক ব্যবহৃত তা হল সিরামিক রেসিস্টর যা দেখতে অনেকটা এরকম । Continue reading


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.

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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