Sunday, 27 October 2013

World's Largest Four Stroke Gas Engine

Instead of powering most of cars we see on the street today, there are some unusual four-stroke engines. The size of these engines may vary strongly, from small domestic engines that power electric generators through regular automotive engines and reaching enormous sizes inside some power plants.

The largest four-stroke gas engine in the world is exactly of the last kind – 18V50SG constructed by the Finnish company Wärtsilä. As the model name shows, there are 18 cylinders with 50 cm diameter nested within 18,6 m long and 396 tons heavy body. The beast produces more than 25 000 hp and is supposed to “eat” natural gas. However, there is a modification capable of using different fuel types – Wärtsilä 50DF, which also could be “fed” with heavy or light fuel oil.

The engine uses lean-burn technology, which simply explained means that air is more than fuel inside the cylinder before the ignition stroke. This is achieved by using turbo chargers and leads to better burning, reduced harmful emissions and lower peak temperatures. Each cylinder is controlled individually by ECS (Engine Control System) which regulates the air-fuel ratio, ignition timing and everything else.

Wärtsilä was created at the end of 19th century and is now working in two main fields: power plants and marine solutions.

via: []

Nokia Lumia 2520 Tablet PC Review

Nokia Lumia 2520 Tablet PC Review

Nokia introduce a first Lumia tablet PC "Nokia Lumia 2520" which is having 32 GB of internal storage, 10.1 inches IPS LCD capacitive touchscreen, 2 GB of RAM, 6.7 MP camera and running Microsoft Windows RT.

Nokia Lumia 2520 Tablet PC Specification

    2G Network GSM 850 / 900 / 1800 / 1900 - all versions
    3G Network HSDPA 850 / 900 / 1800 / 1900 / 2100 - RX-113, HSDPA 850 / 900 / 1900 / 2100 - RX-114, RX-114v
    4G Network LTE 800 / 1800 / 2600 - RX-113, LTE 700 / 850 / 1700 / 1900 / 2100 - RX-114, LTE 700 / 1700 / 2100 - RX-114v
    10.1 inches IPS LCD capacitive touchscreen, 16M colors, 1080 x 1920 pixels, Multitouch, Protection Corning Gorilla Glass 2, ClearBlack display
    microSD Card Slot
    32 GB Of Internal
    2 GB RAM
    EDGE Up to 236.8 kbps
    Speed HSDPA, 42.2 Mbps, HSUPA, 11.5 Mbps; LTE, Cat4, 50 Mbps UL, 150 Mbps DL
    WLAN Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi hotspot
    Bluetooth v4.0
    USB USB v3.0, USB Host support
    OS Microsoft Windows RT
    Chipset Qualcomm MSM8974 Snapdragon 800
    CPU Quad-core 2.2 GHz Krait 400
    GPU Adreno 330
    Sensors Accelerometer, gyro, proximity, compass
    Messaging SMS(threaded view), MMS, Email, Push Email, IM
    Browser HTML5
    GPS with A-GPS support and GLONASS
    Colors Cyan , Red, Black, White
    Camera 6.7 MP, 3088 x 1744 pixels, Carl Zeiss optics, autofocus, 1/3.4'' sensor size, 1080p@30fps Video