Ken Burns Tells Colbert Why Racism Dominates American History. Ken Burns Tells Colbert Why Racism Dominates American History. According to the filmmaker, Trump taking two days to disavow the Ku Klux Klan is just one of many signs that racism still exists in America.
Leicester City defender Harry Maguire has praised West Ham forward Marko Arnautovic as a top player as is wary of the threat he poses as the Hammers visit the King Power Stadium on Saturday.Marko Arnautović has been prolific so far this season having scored four times in nine Premier League games this season, including in their back-to-back wins against Everton and Manchester United, and Harry Maguire knows the Austrian international very well.“I think you can see with how they play and I think all the chances they create mainly fall to him,” Maguire told Leicester City website.Maguire says United need to build on today’s win George Patchias – September 14, 2019 Harry Maguire wants his United teammates to build on the victory over Leicester City.During the summer, Harry Maguire was referred to as the ultimate…“He’s a top player, he’s been in the Premier League numerous years now, he was a top player for Stoke and he’s starting to show his true colors at West Ham now as well.“He’s a top player for them and someone we’ve got to be wary of, but there are really good players in other areas too.”
Citation: Study shows wind and solar plant benefits vary by location (2013, June 25) retrieved 18 August 2019 from https://phys.org/news/2013-06-solar-benefits-vary.html A photograph of w:Nevada Solar One and Copper Mountain Solar 1. Credit: Michael Adams © 2013 Phys.org More information: Siler-Evans, K., Lima Azevedo, I., Morgan M. G. & Apt, PNAS doi: 10.1073/pnas.1221978110 (2013).AbstractWhen wind or solar energy displace conventional generation, the reduction in emissions varies dramatically across the United States. Although the Southwest has the greatest solar resource, a solar panel in New Jersey displaces significantly more sulfur dioxide, nitrogen oxides, and particulate matter than a panel in Arizona, resulting in 15 times more health and environmental benefits. A wind turbine in West Virginia displaces twice as much carbon dioxide as the same turbine in California. Depending on location, we estimate that the combined health, environmental, and climate benefits from wind or solar range from $10/MWh to $100/MWh, and the sites with the highest energy output do not yield the greatest social benefits in many cases. We estimate that the social benefits from existing wind farms are roughly 60% higher than the cost of the Production Tax Credit, an important federal subsidy for wind energy. However, that same investment could achieve greater health, environmental, and climate benefits if it were differentiated by region. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. (Phys.org) —A team of researchers from Carnegie Mellon University has published a paper in the journal Proceedings of the National Academy of Sciences suggesting that governments and utility companies rethink where renewable resource plants are built. They claim that building solar or wind farms in regions that currently rely heavily on burning coal to produce electricity provides far more societal benefits than building similar plants in parts of the country that currently use much cleaner gas-fired plants. Explore further Journal information: Proceedings of the National Academy of Sciences To come up with a way to measure the societal value of building solar or wind farms, the researchers attached a monetary value to the pollution currently created by power plants—$20 per ton for carbon dioxide emitted. They did the same with costs associated with people dying from air pollution emitted from power plants—arriving at $6 million per person. Using these numbers, they were able to calculate how much money a region would save if they replaced current electricity plants with wind or solar farms. In so doing, they found a wide range, from $10 per megawatt hour in Arizona to $100 in several northeastern states.The overall point the researchers are trying to make is that it doesn’t always make the most sense to put a renewable resource farm in a region based solely on how efficiently it will perform there. Solar farms in the southeast part of the country, for example, produce far more electricity than do the same types of farms in northern areas—they get more sunshine. Similarly, wind farms vary in efficiency depending on where they are placed—but if a solar or wind farm displaces far more pollutants in the north than in the south, than more should be built there, despite their being far less efficient in those regions.The researchers also note that their calculations show that the entire country is currently saving about $2.6 billion annually due to wind and solar farm output, which they note is 60 percent more than the government spent subsidizing just wind plants. A good return on investment, the team says, but one that could be much better if the government switched its focus from rewarding those plants that produce the most electricity, to those that displace the most pollutants. Energy from new Australian wind farms cheaper than from new coal or gas plants, report shows
More information: Amir Siraj and Abraham Loeb. Discovery of a Meteor of Interstellar Origin, arXiv:1904.07224 [astro-ph.EP]. arxiv.org/abs/1904.07224 Explore further Trajectory of the January 8, 2014 meteor (red), shown intersecting with that of Earth (blue) at the time of impact, ti = 2014-01-08 17:05:34. Credit: arXiv:1904.07224 [astro-ph.EP] © 2019 Science X Network Interstellar objects like ‘Oumuamua probably crash into the sun every 30 years A pair of researchers has found possible evidence of an extrasolar object striking the Earth back in 2014. In their paper uploaded to the arXiv preprint server, Amir Siraj and Abraham Loeb describe their study of data in the Center for Near-Earth Object studies database and what they found. Journal information: arXiv , Astrophysical Journal Letters This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Citation: Possible evidence of an extrasolar object striking the Earth in 2014 (2019, April 17) retrieved 18 August 2019 from https://phys.org/news/2019-04-evidence-extrasolar-earth.html Abraham Loeb is the Harvard University astronomer who made headlines recently when he suggested that the space object known as ‘Oumuamua might have been part of an alien spacecraft. ‘Oumuamua was believed to have come from outside of the solar system because its trajectory showed it was not gravitationally bound to the sun—also, it traveled faster than traditional space objects. In this new effort, Loeb and his undergraduate assistant Siraj claim to have found evidence of another object from outside of the solar system.Loeb and Siraj had reasoned that space objects traveling faster than normal might be evidence enough of an extrasolar visitor. That led to them to perform searches in the Center for Near-Earth Object studies database for objects that traveled faster than normal. They report that they found three hits, two of which they dismissed because of incomplete data. The third described a meteor that was believed to be slightly less than a meter wide that had been observed disintegrating in the atmosphere on January 8th, 2014, at a height of 18.7 kilometers near Papua New Guinea. Its speed had been measured by a government sensor at 216,000 km/h. By looking at its trajectory and tracing backward, the researchers report that it likely came from somewhere outside of our solar system. If the evidence pans out, the sighting would be the first known instance of an extrasolar object striking the Earth.The researchers suggest that the object’s high speed indicates that it was likely flung out of another star system. And if that were the case, it would have been reasonably close to its star at some point, deep in the interior of a planetary system—perhaps in its “Goldilocks zone,” which means there was some chance it carried life. The researchers have written a paper describing their findings, which they have submitted to The Astrophysical Journal Letters.