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Treasures of Lake Kivu

05.12.2010

The large African Lake Kivu, lying on the border between the Democratic Republic of the Congo and Rwanda, hides in its depths a real energy treasure. At a depth of 300-500 meters, methane is dissolved in lake water - as much as 65 cubic kilometers of natural gas.

Rwanda has recently begun to develop these reserves by placing in its waters a floating platform of the type used for the extraction of gas and oil in the seas. From a depth of 320 meters, a thousand cubic meters of gas are pumped out every hour. It operates a 30-megawatt thermal power plant located nearby. It is planned to increase its capacity to 2013 megawatts by 200 in order to supply electricity to neighboring countries. Gas reserves will last at least a hundred years.

Where does the methane in the lake come from? It has accumulated over millennia thanks to the activity of bacteria that decompose the remains of dead plants and animals that sink to the bottom. But with this gas, the content of which in the lake has increased by 30% over the past 20 years, there may be a danger associated.

Lake Kivu lies on a large geological fault; craters of several extinct volcanoes have been found at its bottom. If they wake up, disaster for the entire region is guaranteed.

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50-megapixel Samsung ISOCELL GN1 sensor 24.05.2020

The family of Samsung ISOCELL photosensors for smartphone cameras has been replenished with another novelty - a model called ISOCELL GN1 with an optical format of 1/1,31". , which supports both Dual Pixel and Tetracell technologies.

With a relatively larger sensor cell size, the Samsung ISOCELL GN1 is said to take mobile cameras to the next level, combining higher light sensitivity for low-light shots with fast DSLR-level autofocus for action scenes.

1,2 µm is the cell size used in traditional smartphone camera sensors, while over the past year the market has seen a clear trend towards a rapid increase in resolution and a reduction in the physical size of individual cells.

Samsung ISOCELL GN1 appears to be a direct competitor to the new Sony IMX689 sensor (Oppo Find X2 Pro), which is characterized by a resolution of 48 megapixels and a cell size of 1,22 microns. By default, the Samsung sensor will capture 12,5 megapixel photos by combining the signal of four neighboring pixels (Tetracell technology).

Dual Pixel is another prominent feature of the new sensor. The latest flagship Galaxy S20 Ultra with a 108MP camera without Dual Pixel is known to have had focusing problems - after complaints from journalists and users, the company released several firmware updates to improve camera performance. According to Samsung, the new ISOCELL GN1 sensor has the fastest phase detection autofocus system on the market.

Dual Pixel technology places two photodiodes next to each other in a single pixel that can receive light from different angles to determine the phase. Thanks to this, the sensor is able to instantly detect and focus on the desired stationary or moving object from any angle, even in low light conditions. Samsung also provides a software algorithm that receives light information from each photodiode to produce high-resolution images comparable to 100MP.

Samsung ISOCELL GN1 also supports Smart-ISO technology to automatically select the "correct" ISO value depending on the environment, electronic stabilization and supports video recording up to 8K at 30 frames per second.

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