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  • Researchers have learned how to charge your smartphone by walking


    DeZire

    In search of alternative energy, researchers sometimes come up with amazing technologies. Chinese researchers have managed to develop a device that can generate electricity from bending the knee when walking. The created sensor can be an excellent feed for wearable electronics and other devices.

    Researchers have learned how to charge your smartphone by walking

    Engineers of the Chinese University of Hong Kong solved the issue of energy generation from the knee joint. The designed portable sensor is installed on three points of the leg: calf, Knee, and Shin. A rod is attached to a special bandage, which is held on the human thigh. Another bandage is fixed on the calf. While walking, a special slider makes translational movements.

    Strips of polymer and carbon fiber placed on the ends of the rod allow generating energy. During the tests, the researchers managed to achieve a power of 1.6 microbats. To achieve it, the speed from 2 to 6.5 km/h is enough — that is, such a current and voltage will be generated during a regular measured walk.

    Researchers have learned how to charge your smartphone by walking

    The resulting energy can be accumulated, and then charge the wearable electronics or smartphone. The weight of the sensor is 307 grams. The plans of the developers — the creation of a mass product, which may well be an alternative to portable batteries, because to recharge the gadget user will be enough to walk a little.



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    • OPPO Reno 3 review: Quad camera and lots of memory

      Last year's OPPO Reno 2 smartphone was remembered for its almost flagship characteristics. In the new generation, the emphasis has shifted - the role of the top-end device has been assigned to the Reno 3 Pro, and the standard “three” has become a mid-budget phone. However, Reno 3 received a powerful quad camera, high-quality screen, and a large amount of memory. We find out how good the new product is.

      Four rear modules and a 44-megapixel front-facing camera
      The main camera of Reno 3 received four modules, as in the top-end device of the series - Reno 3 Pro. However, there are some functions missing, such as interpolation up to 108 MP. All the blocks are arranged in a line on an islet that protrudes noticeably upwards if you wear the gadget without a cover.
      The main module has a 1/2-inch sensor with a resolution of 48 MP and a lens with an aperture of f/1.8. As usual, in standard mode, it produces 12-megapixel images, and if desired, you can take photos in full resolution - 48 MP. Telephoto is based on a 13-megapixel sensor and a lens with an f/2.4 aperture. The ultra-wide Angle is equipped with an 8-megapixel sensor and a lens with an f/2.2 aperture. Finally, the 2 MP sensor is designed to assess the depth of the scene.

      Telephoto, in addition to 2x optical zoom, provides a 5x hybrid zoom. The photo app allows you to quickly switch between four shooting modes: ultra-wide angle, 1x, 2x, and 5x.
      All modules can function together with HDR. This option works perfectly in Auto mode, improving both the light and dark tones of contrasting scenes. Artificial intelligence confidently recognizes the scenes being shot and selects settings.
      However, in non-standard lighting conditions, if you choose wide-angle optics, the color rendering will not always be accurate. This does not happen with the main module and the telephoto lens.

      The main module paired with the auxiliary module gives clear portraits and realistic blurs the background
      Reno 3 shoots well in mixed and artificial lighting, as well as in the absence of light in the dark. In the most problematic cases, the Night program helps out. It combines several shots and works out all the tones of contrasting scenes. For shooting with manual settings, an Expert preset is provided.
      Multi-megapixel selfies
      The front camera is built into the display and is located in the middle of its upper edge, in the "drop". The camera is equipped with a 44-megapixel sensor and a wide-angle f/2.4 aperture lens. The default settings are set to a 40-megapixel resolution of images. And the full one is selected by pressing a separate on-screen button. The image quality in both cases is approximately the same. Sharpness appears only from a distance of about 30 cm, that is, for example, it is impossible to obtain a macro photograph of your eye. It seems that the calculation was made for shooting with outstretched hands or a selfie stick. For self-portraits, there are traditionally many beauty options: smoothing the skin, correcting the shape of the face and nose, eye size, and so on.

      Selfies in 44MP mode
      The smartphone records 4K videos at 30 fps. The supported format is Full HD with 30 and 60 fps, as well as slow-motion clips in HD and Full HD. During movie shooting, you can freely switch the zoom.
      In 4K mode at 30 frames per second, the gadget produces a picture with the correct color reproduction and high definition. But when working with hands, stabilization is noticeably lacking.
      Shooting in Full HD at 60 fps uses Ultra Steady Video 2.0 stabilization, which makes the picture smoother.
      Work and entertainment without lags
      Reno 3 is built on an eight-core MediaTek Helio P90 chipset. The new product in AnTuTu gives out figures comparable to the results of Kirin 970 and Snapdragon 712, and slightly ahead of Snapdragon 710. And in the Geekbench 5 rating - is on par with Snapdragon 845. This speed is sufficient to avoid slowdowns in any applications.
      8 GB of RAM allows you to run multiple programs simultaneously. The built-in fingerprint sensor acts quickly and accurately. There are no performance problems in games. In the popular WoT: Blitz with default graphics settings, the frame rate is confidently kept at 60 fps.

      The device has only one main speaker, which produces clear sound without distortion up to about 90% of the volume. Plus, there is support for Dolby Atmos. In this software add-on, you can add surround sound and a bit of bass - a great option for multimedia applications.
      Unfortunately, you will not be able to create a full stereo pair, because the speaker is quieter than the main one. But in Reno3 Pro two speakers shake as if you are holding a good Bluetooth speaker in your hands. Complete in-ear headphones deliver high-quality sound. Thanks to the audio jack, you can connect your favorite accessory.

      The built-in storage is not too large: 128 GB. But it is easy to increase it by using a microSD memory card. It is placed in a triple slot next to two nano-SIM cards. We had a 512 GB test card at hand - it worked without problems.
      High autonomy
      The gadget is powered by a 4025 mAh battery and supports VOOC 3.0 fast charging technology. A 20 W adapter and a complete cable during the test provided recharging at high speed. For example, from 33 to 78%, the battery was charged in 13 minutes, and up to 100% in 27.
      An hour-long shootout in WoT: Blitz (display brightness - 50%) consumes 11 percent of the battery. That is, without going to the outlet, it is about 9 hours of offline gaming. In Flight-mode, with the same brightness, about 4.4% of the battery charge is spent per hour playing the video in Full HD. Therefore, you should expect 22 hours of offline video viewing. Excellent results!

      If long-term autonomy is not so important, you can disable power consumption optimization in the settings and select "High performance". In this case, the device will work a little faster, and the battery consumption will be stronger.
      Great screen
      Reno 3 is equipped with an AMOLED panel with a diagonal of 6.4 inches, a resolution of FHD+ (2400x1080 pixels), and an aspect ratio of 20:9. The display occupies 90.8% of the front panel area, has a teardrop-shaped cutout for the front and thin frames. The image is clear, with rich but natural colors. The viewing angles are large, and the brightness reserve is sufficient for using the phone on the street in any weather. With minimal screen light, it is comfortable to read in a dark room. And at night, you can switch to "Dark mode" - in fact, this is an inverse version of the design: with a black display and a white font. Many people will find it even more convenient, and it also saves battery life.
      Branded shell of the seventh version
      Reno 3 is running a proprietary ColorOS 7 shell based on Android 10. When comparing with the previous version, you can see that the font has not changed, but many icons have been redrawn. However, their shape and size can be easily changed at your own discretion. The screen can be converted to a split format - just make a three-finger swipe up.
      Specifications of OPPO Reno 3
      DISPLAY: 6.4 ", FHD + (2400x1080), 20: 9
      CHIPSET: CPU MediaTek Helio P90 (MT6779V), 2.2 GHz, GPU PowerVR GM 9446
      RAM: 8 GB
      STORAGE: 128 GB
      MAIN CAMERA: main - 48 megapixels (f/1.8) + 13 megapixels (telephoto) + 8 megapixels (wide-angle) + 2 megapixels (scene depth sensor);
      FRONT CAMERA: - 44 megapixels with f/2.4 aperture
      BATTERY: 4025 mAh
      FEATURES: a sub-screen fingerprint sensor, an NFC module, an audio output, support for microSD cards up to 256 GB (without SIM replacement), a proprietary shell ColorOS 7, three body colors: black, white and blue.
      Test results
      ANTUTU: 223,438
      GEEKBENCH: 5 428 single-core, 1568 multi-core
      AUTONOMY: about 22 hours of video playback

      Summary
      The OPPO Reno 3 is an interesting device with balanced characteristics. From the first minutes, the beautiful design, slim body, and high-quality 6.4-inch screen make you happy. Later on - high performance, fast recharging, and good battery life. The advantages include the photo-filling, including a 44-megapixel front camera. In addition, the built-in drive can be expanded with a memory card, but not to the detriment of the second SIM card - a trifle, but nice.

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