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the death toll from the latest series of tornadoes that have ripped through parts of the united states is rising. at least three people have been killed in the states of arkansas and illinois. dozens have been injured and tens of thousands have lost power. the governor of arkansas, sarah huckabee sanders has declared a state of emergency. our reporter shelley phelps has more. oh, my god! ripping away building tops, downing trees and flipping over vehicles, the catastrophic tornado started moving through little rock on friday afternoon. this man told cbs news what he saw. and through our window i saw a transformer back here that kind of blew up. i saw that the lightning strike, it kind of blew up, caught me off guard, went in the bathroom, closed the door, and then all of a sudden, it was just like so much wind everywhere. it felt like kind of like the house was shaking and things were kind of like being thrown against it. and it was just something i never experienced be ....
the pope has said he will take part in the mass celebrating palm sunday in the vatican. the 86 year old was discharged from a hospital in rome in the last few hours where he was receiving treatment for bronchitis. smiling and leaning on a cane as he left rome s gemelli hospital, the pontiff greeted well wishers and joked he was still alive. the vatican said he d resumed some work duties while in hospital, baptising a new born baby as well as sharing a dinner with some of the doctors and nurses. earlier i spoke to our correspondentjenny hill who had the latest on the ground. he s now out of hospital. as you say, he appeared very relaxed, smiling as he greeted well wishers outside the hospital, telling reporters that he will participate in that mass right here tomorrow. and, of course, you know, pope francis himself is more than aware that talk of his impending either resignation or demise have been filling the newspapers here, you know, joking with reporters. well, i m ....
In order to study the evolution laws of the temperature field, flow field, and macroscopic morphology of the molten pool during laser cladding process, this paper focuses on the changes in the morphology and flow field distribution of the molten pool temperature field caused by corresponding parameter changes during laser cladding process. First, a multi-physics field coupling model for laser cladding was established by combining light powder interaction, phase transition, heat transfer, and fluid dynamics, and the temperature and flow fields of the molten pool were analyzed. Then, the influence of process parameters such as laser power, scanning speed, and powder feeding rate on the temperature and flow field of the molten pool was studied. Finally, the influence of Marangoni convection induced by surface tension temperature coefficient on the macroscopic morphology, internal temperature field, and flow field distribution of the molten pool was investigated. ....
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