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  1. This is posted in Ideas which is wrong place to post
  2. Problem: a huge percentage of airplane emissions come from long-haul travel. Are electric planes the solution? Companies around the world are working to develop electric airplanes. The hope is that advances in battery technology will enable efficient, emissions-free aircraft to replace kerosene-burning Jets. Considering air transportation accounts for around 4 percent of the global climate change impact, electric airplanes are seen as a key technology for cleaning up the transportation sector. The London-based non-profit Fellow Travelers assessed the potential carbon emissions mitigation could be accomplished by switching British aviation from Jets to electric propulsion. The results were not encouraging. The first planes to go electric - short-range, low-capacity aircraft - are also the ones that contribute the least amount of carbon pollution. Even If electric planes take over all flights of less than 1,500 km - about 900 miles - they will only make a small dent in carbon emissions. According to the data from Fellow Travelers, 87 percent of aviation-related carbon emissions are due to flights longer than 1,500 km, and the vast majority can be attributed to long-haul aircraft. The report focused on the United Kingdom, but the results are generally applicable. Electric jets won't solve the aviation emissions problem. Jeffrey Winters
  3. From the album: Graphs & diagrams

    Following is the Turning_moment Diagram of a Four Stroke Internal-combustion Engine. As we already know that the four-stroke engine will have one power stroke (working stroke), for every two revolutions of the crank (720°). Turning Moment Diagram for a Four Stroke Engine Turning_Moment Diagram for a Four Stroke Engine During the suction stroke, the pressure inside the cylinder is less than the atmosphere, that is the reason for the negative slope in the suction region in the above graph. During the compression, the work is done on the gasses so it is also represented under the negative slope. Under the expansion/power stroke the fuel combustion will happen and the piston moves downward and produces some mechanical work on to the crank. This is work done by the gasses onto the piston. As shown above, there is a huge positive loop shown this area of the graph represents work done by the gasses. And further, the combustion particles will exhaust, during this stroke, the work is done on the exhaust gasses, therefore there is a negative slope represented. In the above graph, the effect of the inertia forces also considered. Since there are the positive loops present in the suction and the exhaust graph regions shown above. This is the turning_moment diagram for a Four Stroke Engine.
  4. just take mouse on image,,,,, it will show you image tools
  5. First job one does is as GET - Graduate engineer trainee.... where he is sure to get practical training.... however we have seen even do not study theory properly..... do we understand why calculations are done.....why and whats assumptions are we making ?
  6. Dear Mechanical Engineers We invite you for the following discussion Application of Artificial Intelligence & Machine Learning in Mechanical Engineering How can we apply AI in filed of Machine learning ? You can consider your workspace, your industry.....let all of us have come together with ideas...
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