05-08-2022, 12:58 PM
By comparison, jackhammers (sometimes called pneumatic drills or demolition hammers) make quick work of even really hard surfaces like highways, patios and rock walls. That doesn't mean jackhammers are easy to use. They tend to be unwieldy, with some weighing nearly 100 pounds (45 kilograms), meaning that safe operation requires a user with some muscle. In spite of the challenges of using jackhammers, these tools really are necessary for all sorts of major projects. And even though they perform a straightforward and brutal task, modern jackhammers are thoroughly evolved and refined machines with a long history. Keep reading and you'll see just how jackhammers came to be. Machines and power tools of all kinds made labor easier and less physically taxing. But men working in mines and quarries still had to work with pickaxes and shovels, cussing their way through the day. Brawn just wasn't enough for these exhausting jobs. What these laborers really needed was a more powerful way to break through rock to reveal minerals or release stones for construction.|Russia on Thursday launched a major attack against Ukraine following a months-long military buildup on the border, triggering international condemnation for an "unjustified" war that is feared will result in significant loss of life in Europe. Russian President Vladimir Putin moved ahead with what Ukraine called "a full-scale invasion" after announcing that Moscow would carry out a "special military operation" in eastern Ukraine known as the Donbas, where two pro-Russia separatist regions are located. More than 40 soldiers have been killed and dozens more hurt as Russian forces attack Ukraine from the north, east and south, according to media reports, citing information from the Ukrainian government. Moscow has been asserting that its security is under threat with the North Atlantic Treaty Organization's eastward expansion and the possibility of Ukraine's membership in the alliance. U.S. President Joe Biden and NATO immediately condemned the Russian invasion as an "unprovoked" and "unjustified" attack on Ukraine. Biden said in a statement. Users are now overwhelmed by the amount of data, for instance, on YouTube alone, searching for “Deep Learning Lectures” retrieves hundreds of results ranging from content created by various individuals to organisations worldwide. The ideal option for any user is to select the one that they could engage with reliably. While beliefs and biases (White, 2013) do surround the choice of the videos, e.g., videos from a popular academician in a well-known organisation could be regarded as more interesting than others, this may not always be true. Simply relying on user ratings or modelling text extracted from the video recordings alone might not lead to desirable results because these features do not capture the overall quality of the content. Given the extensive and discrete number of educational materials, new and automated management ways are being devised where mostly cascaded models are used to predict the engagement score (Bulathwela et al., 2020a). Regarding the OERs, this means to scale down the learners’ efforts of finding the material without compromising its quality. worldnews
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