It needs to be cost effective (which might include profotabilit6), be feasible to implement, sustainable, and a bunch of other stuff too.
Aircraft carriers and subs being the only transportationethod using nuclear is a good sign that it isn't practical for shipping. That is likely a combination of nuclear requiring highly trained staff that are not just out in the work force, the ability to procure a reactor and maintenance parts, the ability to obtain fissible material, the ability to dry dock a ship with a nuclear reactor, and a bunch of other stuff that could even be affordable without being practical for reasons beyond costs.
Best depends on many factors beyond things like efficiency, weight, or durability. Lateen sails are easy to implement with a single mast, are easy to store and maintain, and everyone that has sailed has experience with them. Other sails might do a better job of catching the wind, but with tradeoffs on maintenance and usability.
Practicality is often complex and leans towards easier maintenance and established knowledge.
General rule for ships, at least heavily loaded ships, is to retire after some 60 or so years. There’s no exact number but it exists for each type of ship. Reason is material stress. Even though ship might look okay, they have a lot of stress when transporting cargo or in general dealing with waves. In time, these stresses cause material stress and eventually fracture.
This is the reason behind those videos on YouTube where ship splits in half in high waves. It’s not that ship can’t handle high waves, it’s simply that ship owner wanted to squeeze more money out of the vessel and didn’t want to retire it, even though he was most likely advised to do so.
Thousands of Muslims in a city in Pakistan have set fire to at least four churches and vandalised the homes of Christians over claims that two men desecrated the Quran, police say.
“The Pakistani society has experienced increased fragmentation, driven by widening economic disparities, leading to an upsurge in violence directed towards minority religious groups,” Mr Bashar said.
A local official told BBC Urdu that authorities received calls about protests and fires early Wednesday morning after reports of the two men allegedly desecrating the Quran, the holy book of Islam, circulated on social media.
Authorities said torn pages of the the sacred text with blasphemous content allegedly scribbled on them in red marker ink, were found near a Christian community.
“They broke the windows, doors and took out fridges, sofas, chairs and other household items to pile them up in front of the Church to be burnt,” he told AFP news agency.
Amir Mir, the information minister for Punjab province, condemned the alleged blasphemy and said in a statement that thousands of police had been sent to the area, with dozens of people detained.
Shane Thompson, the region’s environment minister, told a press conference on Wednesday that the fires had “taken another turn for the worse” and now represented a “real threat” to Yellowknife.
“Watching the flights sell out and the prices go up I just kind of got to a point where we should leave,” Ashley Maclellan, who fled with her baby to nearby Edmonton, told the CBC.
Resident Lisa Mundy described how her bumper had begun to melt, her windscreen had cracked and her car had filled with smoke as she and her husband left the town with their two children on Sunday.
Canada’s military has been co-ordinating airlift operations out of several communities in Northwest Territories’ South Slave Region that have been threatened by wildfires in recent days.
Airlift operations out of Yellowknife are set to begin on Thursday afternoon, the territory’s government said, with five flights scheduled to Calgary.
If you are reading this page and can’t see the form you will need to visit the mobile version of the BBC website to submit your question or comment or you can email us at [email protected].
The fire has spread some 8 sq km (800 hectares) since it started in a nature reserve on the north-east coast of the island late on Tuesday evening.
Local authorities have cut off access to the forest around the Mount Teide volcano, Spain’s highest peak, and say secondary fires have now broken out.
The main blaze is spreading through woodland and ravines in the Candelaria and Arafo areas, making it difficult for firefighters to tackle.
Photos show large flames engulfing parts of the forest, and thick plumes of smoke billowing into the sky.
Wildfires have raged in many parts of the world this summer, including in southern Europe, northern Africa, Canada, and Hawaii.
If you are reading this page and can’t see the form you will need to visit the mobile version of the BBC website to submit your question or comment or you can email us at [email protected].
bbc.co.uk
Top