Construction, Operation, And Maintenance Of: Fill & Download for Free

No. Not at all.A space elevator has never been remotely within our technical means, so it has never been on NASA’s agenda. To build a space elevator—at least as generally conceived—would require a material with a tensile strength many times greater than that of Kevlar. The material has to be economical, tolerant of temperature extremes and radiation, and it must have a number of other specific properties to make it suitable not only for operating the elevator, but for building it and maintaining it. Then you need appropriate safety margins.And that’s just for starters.Assuming the basic material was available, then you’d have the actual mechanics of construction, operation, and maintenance to work out. It would be enormously massive, so you’d need realistic failure scenarios to plan for, and international buy-off to obtain. It would need power. You’d need a way to get rocket fuel up it (probably by carrying tanks, but a pipeline would be more useful if you could swing that.Oh, and unlike orbiting spacecraft, the elevator would be unable to move out of the path of approaching debris, so that’s a challenge that would have to be planned for. And weather and seismic impacts. And terrorism.If we ever develop a material of the right class that we can produce in industrial quantities, NASA will be all over it.If you like space, you might enjoy my free award-winning scifi sampler.

It’s fair. Would you buy a $300,000 word processor?Software engineering is engineering.Engineering - WikipediaEngineering is the application of knowledge, typically in the form of science, mathematics, and empirical evidence, to the innovation, design, construction, operation and maintenance of structures, machines, materials, devices, systems, processes, and organizations.Engineers make tradeoffs which are hopefully appropriate.Usually, people buying their products prefer optimizing for price over guaranteed correctness. Needing an occasional restart and losing 30 minutes of work less frequently beats spending an extra $100,000 on spreadsheet software.Sometimes they don’t. A $30,000,000,000 program to build a new Boeing uses DO-178C to prevent deaths from software regardless of cost.Between the two, when revenue matters enough people run business software in three geographic locations, each with hot spares that can quickly replace failed nodes. You can continue using it as long as all three or 6 of 12 servers processing your data don’t crash before a substitute comes online.

I’ll try to be unbiased here. Let’s talk about the facts only.They use the concept of motorways. In Pakistan, the expressways are not of high ranges so they introduced the concept of motorways. Pakistan’s longest operational expressway is Peshawar Northern Bypass which is merely 32 km; remaining are either proposed or under construction.Motorways of Pakistan are a network of multiple-lane, high-speed, controlled-access highways in Pakistan, which are owned, maintained, and operated federally by Pakistan's National Highway Authority. There are six lanes at maximum. The total length of Pakistan's motorways was 1010 km as of February 2017. Around 3690 km of motorways are currently under construction in different parts of country. Most of these motorways projects will be completed by 2019. The longest operational motorway of Pakistan is Multan-Sukkur or M5 motorway of length 392 km.Islamabad-Lahore motorway.Now let’s talk about Indian expressways.Expressways are the highest class of roads in India. These are six or eigh-laned controlled-access highways where entrance and exit are controlled by the use of ramps that are incorporated into the design of expressway. Currently, approximately 11,455.4 km of expressways are operational in India. The National Highways Development Project by the Government of India aims to expand the highway network and plans to add an additional 18,637 km (11,580 mi) of expressways by the year 2022. National Expressways Authority of India operating under the Ministry of Road Transport and Highways will be in charge of the construction and maintenance of expressways. The longest length of operational expressway is the Agra-Lucknow Expressway of length 302 km and the largest proposed expressway is Narmada Expressway of 1300 km in length.Yamuna expresswaySo after analyzing both countries’ road networks in terms of expressways, I didn’t find any superiority of Pakistan over India or vice-versa. Even then India has an edge over Pakistan in terms of the number of expressways India had built so far and the length of the roads. India has bigger lanes (maximum eight). Indian roads bear more vehicle and load than Pakistan’s roads.So guys, chill! India is a big nation; we are big in number. Try to concentrate on your infrastructure rather than on weapons. I am pretty sure Pakistan will be a great nation then. Cheers!EDIT 1: thanks Surakshit Bhavishya for correction.EDIT 2: MY FIRST 1K UPVOTES :).THANKS PEOPLE FOR APPRECIATING MY ANSWER. I WILL TRY MY BEST TO WRITE MORE SUCH ANSWERs.