Astros, Dodgers connect, riveting World Series onto Game 6

first_imgDodgers ace Clayton Kershaw, meanwhile, has been tagged for a record eight home runs in a single postseason. Gurriel got him in Game 4, and Houston has 13 overall against the Dodgers.Did anyone expect this many at this time in October? Surprising, right?“I guess a little bit, just because both teams are putting up incredible at-bats in the most important times,” Astros manager A.J. Hinch said Monday on a conference call.“I think we realize on the pitching side, both teams are at the very end of their rope,” he said. “Their mistakes are getting hit. But the volume is certainly record-setting, and certainly the intensity of the moments that are ending in home runs is hard to fathom.”Dodgers lefty Rich Hill opposes Verlander in a rematch from Game 2. That night, the teams wound up combining for a Series-record eight home runs, with Houston holding on to win 7-6 in 11 innings.Los Angeles reliever Ross Stripling was among 14 pitchers, seven on each side, who worked in the Game 5 slugfest.“If we can just hold them to less than 12 runs, we can get some wins,” Stripling said.There were 6,105 home runs during the regular season, an average of about 2.5 homers per game. There have been 4.4 per game in the Series.The ball has been flying out of the ballpark all year,” said Justin Turner, whose tiebreaking homer helped Los Angeles win the opener, when the gametime temperature was 103 degrees.“So, no, it’s not surprising. I will say that you might see a little bit different game here tomorrow night, a little bit different weather. It’s going to be a lot cooler here than it was for the first two games, and it might be a different ballgame than you’ve seen in the first five games.” Don’t miss out on the latest news and information. 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MOST READ It’s too early to present Duterte’s ‘legacy’ – Lacson Jake says relationship with Shaina ‘goes beyond physical attraction’ Houston Astros’ Brian McCann hits a home run during the eighth inning of Game 5 of baseball’s World Series -against the Los Angeles Dodgers Sunday, Oct. 29, 2017, in Houston. (AP Photo/David J. Phillip)LOS ANGELES — At this rate, Justin Verlander might very well hit his first home run for real.A classically poor-hitting pitcher, the Houston ace knocked one over the wall last week at Dodger Stadium in batting practice. Maybe that bolstered his belief that this batch of baseballs is slick and juiced.ADVERTISEMENT On Tuesday night, Verlander aims to lead the Astros to their first championship when he faces the Los Angeles Dodgers in Game 6 of a power-packed World Series that’s already set the mark for home runs.“We’re just making memories right now,” Astros catcher Brian McCann said, a day after he homered.A total of 22 homers so far, more than 1½ miles of dingers.FEATURED STORIESSPORTSRedemption is sweet for Ginebra, Scottie ThompsonSPORTSMayweather beats Pacquiao, Canelo for ‘Fighter of the Decade’SPORTSFederer blasts lack of communication on Australian Open smogThese nightly episodes of home run derby are connecting with fans, too — in much of the country, they stayed up well past midnight to watch Houston outlast the Dodgers 13-12 in 10 innings at Minute Maid Park, TV numbers showed.With each swing, perhaps this Series really is becoming more riveting. George Springer, Jose Altuve, Carlos Correa, Yuli Gurriel and McCann launched longballs in the Astros’ back-and-forth thriller. Cody Bellinger and Yasiel Puig homered for the Dodgers — seven different players on each side have homered.“This is not going to be finished Tuesday. It’s going to be Game 7,” Puig said.Springer has hit three in the Series. His assessment of Game 5: “Bedlam.”“This is the craziest atmosphere I’ve ever played in, the craziest results, just big hit after big hit, big play after big play,” the Houston leadoff man said.Major League Baseball set a record this year for most home runs in a season and, fittingly, Minnesota leadoff man Brian Dozier began the playoffs with a homer.ADVERTISEMENT View commentslast_img read more

Local heroes

first_img Kourtney Zilbert scored 14 points and pulled down 15 rebounds to lead Burroughs of Burbank to a 56-29 win in Pacific League play. Britney Morgan added 12 points, five rebounds and five steals for the Indians won their 22nd game of the season, breaking the school record of 21 set in 2002. Zaina Akeh had 17 points and 15 rebounds as Notre Dame of Sherman Oaks upset visiting Havard-Westlake of Studio City 44-40 in Mission League play. BOYS’ SOCCER Fernando Mora and Rafael Ornelas each scored a pair of goals to lead SOCES of Reseda to a 7-1 rout against Discovery Prep of Pacioma in Valley League play. GIRLS’ BASKETBALL Tatianna Thomas scored 25 points and Megan Ford added 15 points as visit Hart of Newhall defeated Foothill League rival Canyon 53-45. BOYS’ BASKETBALL Huessin Habibi recored his area-best 10th triple-double of the season with 13 points, 17 rebounds and 10 assists, while Richie Polan had 34 points and 14 rebounds for host Buckley of Sherman Oaks, which clinched its fourth consectutive Liberty League title with a 54-53 victory against Yeshiva of Los Angeles. center_img Wilmer Seguera, Bob Colocho and Gio Casteneda each scored as Chatsworth defeated El Camino Real of Woodland Hills 3-1 in West Valley League play. GIRLS’ SOCCER Rebekah Toga scored to lead El Camino Real to its 30th consecutive West Valley League victory in a 1-0 defeated of visiting Chatsworth. Brittany Clark scored the game’s lone goal for Hart in a 1-0 win over Canyon in Foothill League play. Melissa Fernandez scored twice as Granada Hills defeated Cleveland of Reseda in West Valley League play. Robyn Estrada scored her 28th goal of the season, good for the area’s second highest total, to lead Desert Christian of Lancaster to a 2-0 victory over Frazier Mountain of Lebec in High Desert League play. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set!last_img read more

Ohio Ag Weather and Forecast, December 19, 2018

first_imgShare Facebook Twitter Google + LinkedIn Pinterest Today will be dry but will be a transition day as we start to work into a more active weather pattern from now through the end of the year. Today will feature increasing clouds ahead of our next weather system, but temps remain above normal for this time of year. This will be the last dry day until we get to the weekend. Rain moves into the state tomorrow, bringing a few hundredths to .3”,tracking mostly over western Ohio. A secondary, stronger batch of moisture surges up into Ohio for Friday. This is where we can see some significant moisture development, and are penciling in up to 1.25″ of precipitation.  The rains linger into early Saturday before ending. Cold air will be advancing, but we think it does not get here fast enough to cause a problem with the Friday moisture…it should all stay liquid. We won’t rule out wet snow flakes as precipitation ends early Saturday, or near the lake early Saturday morning.  for Friday, we just don’t think it’s a big deal. Overall, combined moisture for the next two days will end up at from .25″-1.5″ with coverage at 90%. The map at right shows an update of rain totals through Saturday midday. We are dry for most of the weekend…all of Saturday and most of Sunday. We will be turning much colder as temps fall to below normal levels. We are still talking up a chance of some light snow overnight Sunday night through mid morning Monday and leaving snow totals at a coating to an inch or two, and coverage at 70% of the state. The best snows may end up being in central Ohio. We are dry Monday. Christmas Day is becoming more interesting. There is a huge discrepancy between models. The European model brings a major winter storm with snow, some rain and major accumulations, along with wind. However, the GFS model says a little rain late in the day on Christmas, mostly over west central and southwest Ohio…and,  oh – it’s going to be warm. This is one of the biggest discrepancies we can remember 7 days out on a system. Right now, we continue to leave our forecast dry for Christmas Day, as that has been our bias to this point. We are going to have to see some data that supports the Euro over the next few days in order to get on to any Christmas storm bandwagon at this time. So, we are dry Christmas in our forecast, and we keep the dry weather through Wednesday and the first half of next Thursday. From there, we get wet. Rains arrives Thursday night )27th) and holds through Friday the 28th, bringing .2”-.8” and 90% coverage. Then for the extended forecast period, we have snow to the north and rain to the south from Saturday night the 29th through Sunday midday (30th). Then rain is bac for Monday the 31st through Tuesday the 1st. Then we have snow from late the 2nd through the 3rd. So, expect a very active finish to 2018 and an active start to 2019.last_img read more

Why artificial intelligence will finally unlock IoT

first_imgWhy IoT Apps are Eating Device Interfaces Dean Tang How Myia Health’s Partnership with Mercy Virtua… Tags:#ABBYY#AI#artificial intelligence#featured#Gartner#IoT#Machine Learning#top According to Gartner, there will be more than 20 billion connected devices worldwide by 2020. Today’s enterprises are already benefitting greatly from a strong, connected workforce, but as Internet of Things (IoT) enabled devices move forward, saturating the market, is it possible for them to outpace their own benefits?After all, while the continuing surge of IoT devices is creating an onslaught of data requiring storage and retention, advancements in the IoT world are still bound by how quickly and efficiently data can be computed, and value extracted. Interestingly, the current resurgence of artificial intelligence (AI) technology may provide an antidote to the flood of data today’s digital world is facing.With such rapid innovations in both spaces taking place, what can we expect from their converging paths?Machine learning vs. artificial intelligenceA common question and an important distinction to make in this age of digital transformation is the difference between machine learning and AI. Machine learning is the science of giving computers the ability to learn and find insights without explicitly programming the computers on what to do. In contrast, AI is the science of making computers emulate human decision-making and learning processes. While machine learning is one way to make progress towards human-level AI, it’s important to note that the IoT world is likely to benefit most from AI in this case. This is due to the accelerated pace of development and expansion within the connected world. AI is best suited to keep up with IoT innovation because AI’s data analysis capabilities through machine learning demand a minimal amount of human intervention and help humans to make the best decisions.See also: White House wants nation to be ready for AIIoT data is most valuable to us when it can immediately inform action. That means that data must be analyzed immediately and accurately to maintain a continuous flow of information and feedback within the enterprise and its connected devices. Unfortunately, the traditional approach of writing algorithms through explicit programming is too time-consuming and error-prone to make sense for many IoT devices. In order to analyze IoT data efficiently, businesses are turning to machine learning-based AI to find patterns and correlations to realize the promise of IoT.Dean Tang, CEO of ABBYY North AmericaFinding harmony between AI and IoTConnected devices that leverage AI to help with real-time analytics are here today, and widespread adoption is on the rise. Well-reported examples include smart thermostats like Nest that utilize AI to learn user temperature preferences and adjust energy use accordingly. Additionally, all cars sold by Tesla operate as a network. When one car learns something, the entire fleet learns and benefits. It is important to remember that enterprise businesses are best positioned to purchase IoT devices on a much larger scale than the home and government sectors. Consequently, they stand to reap benefits from IoT investments the quickest. In fact, global investment in enterprise services and products is expected to reach $255 billion by 2019, according to a recent analyst report. The same report also predicts that by 2019, the enterprise IoT market alone will be bigger than the smartphone and tablet markets combined.Within the enterprise sector, AI is already making a mark through aiding real-time decision-making. AI’s capabilities are especially valuable to businesses in effectively dealing with matters connected to these components simultaneously: time, money and risk. This can include sales forecasting, information management and various forms of automation.The path aheadIn AI’s future, developing more natural language capabilities will help to further realize the potential of a connected IoT world. Natural language-based data descriptions will provide a universal way to communicate and understand data among various types of internet devices. This approach will not only allow us to break down the data silos among IoT types, and but also can be expanded to allow humans to communicate with the IoT directly through voice or text.IoT and AI enthusiasts should look forward to a future where these as two technologies evolve their symbiotic relationship. As one technology thrives, more opportunities will arise for the other. IoT that is designed to assist and interact directly with people encourages innovation with AI’s advancements, as it will require human-level language skills and the ability to reason, learn and provide recommendations.center_img What it Takes to Build a Highly Secure FinTech … Follow the Puck Related Posts last_img read more

Thayer Evans Has Moved On From Oklahoma State, Strikes Again

first_imgSI has reported that UC Davis has fired HC Ron Gould. UC Davis just emailed me. They aren’t happy. Per UC Davis, SI report is fabrication.— FootballScoop Staff (@FootballScoop) November 30, 2015 @jasonrmcintyre UC Davis is not pleased.— FootballScoop Staff (@FootballScoop) November 30, 2015So Thayer’s holiday season is off to a strong start. Here is his apology.Update. https://t.co/pbs0kJe33m— Thayer Evans (@ThayerEvansTLA) December 1, 2015Nice. Look, I get it, mistakes happen. But this dude seems to have a penchant for forcing his mistakes down our throats and calling it reporting. And maybe in the end, the UC-Davis coach does get fired and Thayer gets to tell all of us to shove it. But after the Oklahoma State, he sure doesn’t get the benefit of the doubt.If you’re looking for the comments section, it has moved to our forum, The Chamber. You can go there to comment and holler about these articles, specifically in these threads. You can register for a free account right here and will need one to comment.If you’re wondering why we decided to do this, we wrote about that here. Thank you and cheers! Ohhhhh Thayer!The much-maligned “reporter” of the Oklahoma State “scandal” a few years ago is back at it. This time at UC-Davis. Awful Announcing had the tale, and it does not make Thayer look very good.Thayer reported that UC-Davis’ head coach was fired. Then UC-Davis tweeted at him and called the entire thing a “fabrication.” Then Sports Illustrated pulled the story entirely!Then this happened.last_img read more

Oscars 2019 How to watch the winning movies

first_img TV and Movies The 2019 Oscars were Sunday. If you’re feeling inspired to see some of the winning films you didn’t catch earlier, here’s a guide to where you can stream, rent or buy the majority of them. Sorry in advance, but there are still quite a few you’ll have to catch in theaters — not that you need a movie subscription service to do so, but it can’t hurt. Disclaimer: CNET may get a share of revenue from the sale of the products featured on this page. 40 films (and a tech company) you didn’t know won Oscars For more information on what’s available to watch online, check out CNET.com/Netpicks or subscribe to the podcast — it’s free! And go to CNET sister site TVGuide.com to see what else is out in the world of streaming. Audio (weekly): RSS | iTunes | Google Play Video (monthly): iTunes (HD) | iTunes (HQ) | iTunes (SD) | RSS (HD) | RSS (HQ)| RSS (SD) 42 Photos Best Picture, Best Original Screenplay, Supporting Actor  Green Book Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu Best Director, Cinematography, Foreign Language Film Roma Streaming: Netflix Rent/Buy: Nope Best Actor, Sound Mixing, Sound Editing Bohemian Rhapsody Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu Best Costume Design, Production Design, Original Score Black Panther Streaming: Netflix Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Best Adapted Screenplay BlacKkKlansman Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Best Actress  The Favourite Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Best Original Song  A Star is Born Streaming: Nope Rent/Buy: Google Play, iTunes, YouTube, Microsoft Store, Movies Anywhere Bradley Cooper and Lady Gaga in A Star is Born. Warner Bros Best Supporting Actress If Beale Street Could Talk Streaming: Nope Rent/Buy: Still in theaters Best Makeup and Hairstyling Vice Streaming: Nope Rent/Buy: Still in theaters Best Visual Effects First Man Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Best Animated FilmSpider-Man: Into the Spider-VerseStreaming: NopeRent/Buy: Still in theatersBest Documentary – FeatureFree SoloStreaming: NopeRent/Buy: Amazon, Google Play, iTunes, Vudu, YouTubeBest Documentary – Short SubjectPeriod. End of SentenceStreaming: Netflix Best Animated Short FilmBaoStreaming: NopeRent/Buy: YouTube, Google Play RGBIncredibles 2 Pixar All other nominated films A Quiet Place Streaming: EPIX Rent/Buy:  Amazon, Google Play, iTunes, Vudu, YouTube Avengers: Infinity War Streaming: Netflix Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube The Ballad of Buster Scruggs Streaming: Netflix Rent/Buy: Nope Can You Ever Forgive Me? Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Capernaum Streaming: Nope Rent/Buy: Still in theaters Cold War Streaming: Nope Rent/Buy: Still in theaters At Eternity’s Gate Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube First Reformed Streaming: Amazon, KanopyRent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Hale County This Morning, This Evening Streaming: Nope Rent/Buy: Still in theaters Incredibles 2 Streaming: Netflix  Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Isle of Dogs Streaming: HBO Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Mary Poppins Returns Streaming: Nope Rent/Buy: Still in theaters Mary Queen of Scots Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes Minding the Gap Streaming: Hulu, PBSRent/Buy: Nope Mirai Streaming: Nope Rent/Buy: Still in theaters Never Look Away Streaming: Nope Rent/Buy: Still in theaters Of Fathers and Sons Streaming: KanopyRent/Buy: Still in theaters cropralphbreakstheinternetRalph Breaks the Internet Disney Ralph Breaks the Internet Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube RBG Streaming: Hulu, HooplaRent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Ready Player One Streaming: HBO Rent/Buy: Amazon, Google Play, iTunes, Vudu, YouTube Shoplifters Streaming: HooplaRent/Buy: Amazon, iTunes, Vudu, YouTube The Wife Streaming: Nope Rent/Buy: Amazon, Google Play, iTunes, YouTube 0 Post a commentcenter_img Now playing: Watch this: Stream these 2019 Oscar nominees now 2:33 Tags Share your voice Marvel Target Oscars 2019 Amazon Google Play iTunes Netflix YouTube The Avengerslast_img read more

BSNL undersea cable project puts Modi govt in a spot Report

first_imgRepresentational image of workers preparing for laying undersea cable.IBT MediaThe military standoff between Indian and Chinese soldiers in the Sikkim sector of the border and the resultant diplomatic sparring could put telecom operator Bharat Sanchar Nigam Ltd (BSNL) in a spot over its undersea cable project that seeks to connect Chennai and Port Blair.The state-owned BSNL’s ambitious project has apparently raised security fears, according to a report in the BusinessLine. “We have to check all the provisions from a national security perspective,” the business daily quoted a department of telecom (DoT) source as saying.The Union Cabinet had approved the submarine telecom cable project last September to connect mainland India with the Andaman and Nicobar Islands at an estimated cost of Rs 1,102 crore.However, the security establishment had expressed concerns about allowing Chinese telecom firms to bid for the project, given the strategic implications, though the defence ministry has put the ball in the home ministry’s court.”It is not up to the Defence Ministry to decide. The Ministry of Home Affairs will take a final call on this issue,” the daily quoted a senior defence ministry official as saying.Besides, Indian telecom suppliers have also voiced concerns against allowing the Chinese to bid for the project. “Chinese companies have their government’s support for such bids. Our government should be wary of giving them tenders that can render us vulnerable later,” an industry source told the BusinessLine. The Telecom Equipment Manufacturers Association has also written separately to the DoT, asking the government to ensure that Chinese players are kept out. But they need to factor in the reality that given the global bidding for the project, an exclusionist approach won’t work. Some of the companies operating in the undersea cable space include Alcatel-Lucent, Fujitsu, NEC, NSW, TE Subcom and Xtera. The BusinessLine listed Huawei Marine and ZTT Submarine as potential bidders citing sources, while domestic bidders could include Sterlite Technologies, Himachal Futuristic Communications and Paramount Wires and Cables.last_img read more

CES 2019 FCCs Ajit Pai Other US Officials Cancel Vegas Trips Because

first_img ×Actors Reveal Their Favorite Disney PrincessesSeveral actors, like Daisy Ridley, Awkwafina, Jeff Goldblum and Gina Rodriguez, reveal their favorite Disney princesses. Rapunzel, Mulan, Ariel,Tiana, Sleeping Beauty and Jasmine all got some love from the Disney stars.More VideosVolume 0%Press shift question mark to access a list of keyboard shortcutsKeyboard Shortcutsplay/pauseincrease volumedecrease volumeseek forwardsseek backwardstoggle captionstoggle fullscreenmute/unmuteseek to %SPACE↑↓→←cfm0-9Next UpJennifer Lopez Shares How She Became a Mogul04:350.5x1x1.25×1.5x2xLive00:0002:1502:15 Popular on Variety “Because of the government shutdown, some of our scheduled government speakers at CES 2019 have alerted us that they must cancel their travel to the show,” Shapiro said in a statement. “As a result, some of our scheduled CES 2019 programming and speakers will change.”In addition to Pai, Carr and Slaughter, others canceling CES appearances include reps from the U.S. Environmental Protection Agency; Department of Homeland Security; the Federal Emergency Management Agency; and the Food and Drug Administration.For now, among officials still scheduled to appear are U.S. Secretary of Transportation Elaine Chao, set to deliver a keynote speech Wednesday, Jan. 9, from 11 a.m.-noon PT. Her talk will focus on the “future of drones and self-driving technology and how they will revolutionize transportation,” according to the CTA.CTA expects more than 182,000 attendees for 2019 CES, which officially runs Jan. 8-11. Follow updates from the show, including coverage of the full-day Variety Entertainment Summit at CES on Wednesday, Jan. 9, at this link. Read Variety‘s preview of technologies to watch at the world’s biggest consumer-electronics convention.center_img FCC Chairman Ajit Pai and other U.S. government officials will be no-shows at CES 2019 this week as a result of agency funding lapses from the ongoing government shutdown.Pai had been scheduled for a one-on-one interview with Consumer Technology Assn. president/CEO Gary Shapiro on Tuesday, Jan. 8, from 1:30-2 p.m. PT. Pai, a Republican-appointed commissioner named head of the FCC by Donald Trump, also canceled his trip to 2018 CES, coming after his controversial proposal to roll back Obama-era network neutrality rules in December 2017 and targeted harassment of Pai and his family over the issue.In a statement Saturday, the CTA — the trade group that runs CES — said some other U.S. government personnel would not be making the trip to Vegas either because of the shutdown. Sessions pulled from the schedule include a panel with FCC commissioner Brendan Carr and FTC commissioner Rebecca Slaughter previously set for Jan. 8.last_img read more

Is a classical electrodynamics law incompatible with special relativity

first_img However, Mansuripur’s bold claim of a paradox with the Lorentz law has generated some intense criticism. One critic, Daniel Vanzella, a physics professor at the University of Sao Paulo in Sao Carlos, Brazil, has submitted a comment to Physical Review Letters arguing that the Lorentz law is perfectly compatible with special relativity, and that Mansuripur has misunderstood relativistic mechanics. The only paradox, Vanzella says, is why the high-ranking journal accepted the paper in the first place.Charge-magnet paradoxThe basis of Mansuripur’s argument is that the Lorentz law violates special relativity by producing different results in different reference frames. According to special relativity, the laws of physics – including electromagnetism – must be the same in all non-accelerating reference frames. He describes a scenario in which a magnetic dipole and a nearby electric charge are located a certain distance apart. When the magnet and the electric charge are at rest, no net force is exchanged between the two. This is because static electric charges only produce electric fields (to which the magnet is oblivious), and static magnets only produce magnetic fields (to which the static electric charge is oblivious). Both the Lorentz law and the Einstein-Laub version give the same result: the magnet experiences neither a force nor a torque from the electric charge.However, the Lorentz law gives a different result when a stationary observer watches the magnet and electric charge in a moving reference frame. Here, the observer sees the moving electric charge exert a torque on the moving magnet, causing the magnet to rotate as it tries to align itself with the electric field. The presence of this torque differs from the observation in the stationary reference frame where there is no torque.On the other hand, the Einstein-Laub formula, when combined with a corresponding torque formula, gives zero torque value for observers in both reference frames, complying with special relativity.The Lorentz law’s incompatibility with special relativity is not its only shortcoming, according to Mansuripur. Another equally important issue is the long-standing problem of “hidden momentum,” in which he shows that the Lorentz law fails to conserve momentum in certain situations involving magnetic media. In contrast, the Einstein-Laub equations show complete consistency with the conservation laws. For Mansuripur, this evidence indicates that the Einstein-Laub formula should be considered as a better way to understand classical electrodynamics. (Phys.org) — The laws of classical electromagnetism that were developed in the 19th century are the same laws that scientists use today. They include Maxwell’s four equations along with the Lorentz law, which describes the force exerted by electric and magnetic fields on charged particles. But Masud Mansuripur, a professor of Optical Sciences at The University of Arizona in Tucson, is now arguing that the Lorentz law of force is incompatible with special relativity and momentum conservation, and should be abandoned. In a recent issue of Physical Review Letters, he has suggested replacing the Lorentz law with a more general expression of electromagnetic force density, such as one developed by Albert Einstein and Jakob Laub in 1908. Best yet test of Lorentz invariance “This work provides a firm basis for all calculations of force, torque, momentum and angular momentum whenever electromagnetic fields (microwave, light, etc.) interact with material media,” Mansuripur told Phys.org. “The electromagnetic momentum and angular momentum become well-defined universal entities (i.e., the Abraham momentum), the need for ‘hidden momentum’ disappears, and satisfaction of conservation laws as well as conformity with special relativity are guaranteed.He explains that, during the past century, there has been a proliferation of equations for force and torque in the scientific literature, with scientists using several different formulas for the electromagnetic momentum. “My paper fixes the foundational equations and allows researchers to compare their experimental results against a single, well-defined theory,” he said.Quantum natureAccording to Mansuripur, the underlying reason for the difference between the Lorentz law and Einstein-Laub formula involves how each equation mathematically describes the quantum nature of electromagnetic fields and media. For its part, the Lorentz law depicts electric and magnetic dipoles as pairs of positive and negative charges or stable loops of current that interact with electromagnetic fields in terms of free and bound charges and currents. In contrast, the Einstein-Laub formula describes material media as spatio-temporal distributions of charge, current, polarization, and magnetization. Mansuripur explains why this distinction is important.“The fact that the electron orbits inside atoms and molecules are stable is a quantum-mechanical phenomenon,” he said. “Neither Maxwell’s equations nor the Lorentz law of force (and nor, for that matter, the Einstein-Laub force/torque equations) can account for the stability of the electron orbit. The fact that electrons, protons and neutrons have a magnetic moment associated with their spin angular momentum is also a relativistic quantum effect that has no explanation within classical physics. What Maxwell’s equations and the Lorentz law (or the Einstein-Laub law) do is provide formulas that describe the behavior of fields and material media as they are, without attempting to justify that behavior. The Lorentz law, however, simplifies the underlying physics by assuming that electric and magnetic dipoles can be treated as distributions of ordinary electrical charge and current. In contrast, the Einstein-Laub equation and the accompanying torque equation treat free charge, free current, electric dipoles, and magnetic dipoles as four distinct constituents of material media.“So, for example, the fact that a magnetic dipole is associated with something resembling a loop of current is a quantum mechanical effect. The Lorentz law does not ignore this fact, but it takes the resemblance to a current loop too far, treating the magnetic dipole as if it were actually a loop of ordinary current. In contrast, the Einstein-Laub formula acknowledges that magnetic dipoles exist as distinct entities – what makes them distinct is quantum mechanics, of course, but Einstein-Laub does not attempt to justify the existence of these dipoles or their nature. The Einstein-Laub formulas then provide a ‘recipe’ for calculating the force and torque on these dipoles, which turns out to be different from the ‘recipe’ provided by the Lorentz law.”No paradox?One critic of Mansuripur’s ideas, Vanzella, thinks that the paper is so flawed that it should not have been published at all. In his comment submitted to the journal, Vanzella points out that the Lorentz force can be put in a covariant form. In special relativity, a covariant law cannot lead to incompatible descriptions of the same phenomenon in different inertial reference frames. He explains that Mansuripur has incorrectly used relativistic mechanics and ignored a hidden momentum that makes the Lorentz formula predict a torque in one reference frame but not another. “This has blown way out of proportion,” Vanzella said. “Let me begin by stating the most important point: there is no incompatibility between the Lorentz force and special relativity. This is not a matter of opinion: any relativist knows that this is impossible for any specially-covariant law (as is the Lorentz force). By construction, a specially-covariant law is compatible with special relativity. This means that if it leads to a satisfactory description of a phenomenon in one inertial frame, then it leads to consistent descriptions in any inertial frame; there are no paradoxes.”He added that apparent paradoxes appear frequently when dealing with special relativity, but these paradoxes are actually due to simply missing or overlooking part of the relativistic argument. He says that a very similar “paradox” to the charge-magnet paradox, called the Trouton-Noble paradox, was presented and resolved more than 100 years ago. “In this particular case, using a current loop in a perfectly-conducting ring to model the magnet’s magnetic moment, one has to use special relativity to show that, even when the ring is at rest, the total momentum of the system is not zero (when subject to an external electric field),” he explained. “This momentum has been termed ‘hidden’ in the literature and this has led to some confusion, but let me stress that it is real momentum. Mansuripur is missing the point that this momentum is not an ad hoc invention only to solve paradoxes; its existence is forced upon us (upon Nature, actually) due to the principles of special relativity alone. In my comment I do not postulate the existence of this momentum. I simply use special relativity to calculate it; no additional hypothesis other than special relativity and the Lorentz force. Therefore, when Mansuripur dismisses this ‘hidden’ momentum he is doing exactly what I said is needed to arrive at a paradox: missing or overlooking part of the relativistic argument.”Despite his strong disagreement with Mansuripur, he emphasized that his criticism does not suggest anything against Mansuripur’s scientific credibility.“Please note that I don’t think that Mansuripur not knowing the solution of the ‘charge-magnet paradox’ (or not understanding the given solution) is that bad,” Vanzella said. “Special relativity is certainly not his expertise and confuses a lot of people, even physicists.”He also added that he’s not necessarily arguing that the Lorentz law must be the correct law of force, either, but just that special relativity cannot be used to testify against it. The question of which law is correct is an experimental issue. Still, he’s adamant that there is no paradox in this situation.“I wouldn’t even call Mansuripur’s idea ‘controversial,’” he said. “Would you call ‘controversial’ the idea that the Earth is flat? It is simply and provably wrong (I mean the claim that the Lorentz force is incompatible with special relativity).”In a response to Vanzella’s comment, also submitted to Physical Review Letters, Mansuripur has stuck to his original argument, explaining that there is no need to introduce hidden momentum, and that the Trouton-Noble paradox was subtly but significantly different than the charge-magnet paradox.Future of Einstein-LaubDespite the advantages of Einstein-Laub formula, Mansuripur acknowledges that it is not without its own problems. In 1979, physicist Iver Brevik performed an extensive review of the Einstein-Laub formula and other possible candidates for an energy-momentum tensor for the electromagnetic field. In some of the experiments, the Einstein-Laub formula did not match actual observations as closely as another formula, the Helmholtz force equation. However, Mansuripur argues that, due to the potential significance of this idea, the contrary evidence deserves a closer examination.“My colleagues and I are currently trying to identify situations where the distinction between the Lorentz law and the Einstein-Laub formulation is unambiguous, then try to conduct experiments to determine which law is operative in such situations,” he said. “Personally, I don’t attach much significance to the historical evidence against the Einstein-Laub formulation as reviewed in the paper by Brevik. The experiments were all electrostatic experiments, involving the flow of some dielectric fluid into a capacitor. The theoretical methods used to analyze the problem were extremely confusing; many approximations were made, and the Einstein-Laub formula itself was never used directly; instead they used a stress tensor associated with Einstein-Laub, which I have shown elsewhere to be incorrect.Mansuripur also plans to further investigate what he thinks has been a much overlooked distinction between the two formulas: a term that describes the force density of an electric field acting on the polarization density of a material medium. Whereas the Lorentz law uses –(del.P)E, the Einstein-Laub formula uses (P.del)E. Although the two formulations give exactly the same total force and total torque on any solid object, differences emerge when dealing with soft objects.“If applied to soft objects such as biological cells under intense illumination or droplets of oil or water in optical tweezers, the two formulas give different force and torque ‘distributions’ throughout the object,” he said. “This difference in force/torque distribution will then manifest itself in different deformations of the object under intense illumination. Our near-term goal, therefore, is to look for deformations of soft objects in optical tweezers experiments. A long-term goal is to look for observable differences between Lorentz and Einstein-Laub in magnetic materials.” 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. Charge-magnet paradox: the point electric charge q and the point magnetic dipole to its right are separated by distance d in the x’y’z’ frame. An observer in the x’y’z’ frame sees no torque, but a stationary observer in the xyz frame watching the x’y’z’ system move with constant velocity along the z axis sees the moving electric charge exert a torque on the moving magnet. Image credit: Mansuripur. ©2012 American Physical Society More information: Masud Mansuripur, “Trouble with the Lorentz Law of Force: Incompatibility with Special Relativity and Momentum Conservation.” Physical Review Letters 108, 193901 (2012). DOI: 10.1103/PhysRevLett.108.193901 Explore further Copyright 2012 Phys.org All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Citation: Is a classical electrodynamics law incompatible with special relativity? (2012, May 24) retrieved 18 August 2019 from https://phys.org/news/2012-05-classical-electrodynamics-law-incompatible-special.html Journal information: Physical Review Letterslast_img read more

Researchers successfully transform liquid deuterium into a metal

first_img 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. Pair claim they have turned hydrogen to metal Citation: Researchers successfully transform liquid deuterium into a metal (2015, June 26) retrieved 18 August 2019 from https://phys.org/news/2015-06-successfully-liquid-deuterium-metal.html More information: Direct observation of an abrupt insulator-to-metal transition in dense liquid deuterium, Science 26 June 2015: Vol. 348 no. 6242 pp. 1455-1460. DOI: 10.1126/science.aaa7471ABSTRACTEighty years ago, it was proposed that solid hydrogen would become metallic at sufficiently high density. Despite numerous investigations, this transition has not yet been experimentally observed. More recently, there has been much interest in the analog of this predicted metallic transition in the dense liquid, due to its relevance to planetary science. Here, we show direct observation of an abrupt insulator-to-metal transition in dense liquid deuterium. Experimental determination of the location of this transition provides a much-needed benchmark for theory and may constrain the region of hydrogen-helium immiscibility and the boundary-layer pressure in standard models of the internal structure of gas-giant planets.Press release (Phys.org)—A team of researchers working at Sandia National Labs working with another team from the University of Rostock in Germany, has succeeded in squeezing liquid deuterium into becoming what appeared to be a metal. In their paper published in the journal Science, the team describes their new technique which has brought researchers closer to the ultimate goal of creating solid metallic hydrogen. Schematic phase diagram of hydrogen. The figure shows the four known solid phases I to IV and two observed liquid phases, together with the predicted atomic liquid. Blue rings imply rotating quantum molecules, wiggly lines imply entangled rotor state, and solid bonds are where calculation shows a covalent bond. Credit: Science 26 June 2015: Vol. 348 no. 6242 pp. 1429-1430. DOI: 10.1126/science.aac6626center_img Journal information: Science © 2015 Phys.org Explore further Back in 1935, a pair of researchers, Hillard Bell Huntington and Eugene Wigner first showed via theory that it should be possible to create solid metallic hydrogen—all that was needed was sufficient pressure. Since that time, various teams have attempted to prove that theory correct, but to date, none have been successful. In this new effort, the research team has developed a new way to add pressure that does not cause other problems. Other than pride, the only real benefit of pursuing the objective is the information that can be gleaned from such efforts, information that might prove useful in studying other planets, for example—it could shed light on the forces necessary to produce observed phenomenon.Up till now, the technique used to pressurize hydrogen, has been based on squeezing samples of it between two diamond tips—such experiments have shown that it is possible to get compounds rich in hydrogen to become metal-like.In this new effort, the researchers noted that using the dual diamond tip approach was unlikely to result in achieving the ultimate goal due to the problem of sample materials becoming too reactive. They chose to go another route, making use of the massive Sandia Z machine—it is capable of creating magnetic fields up to 20 mega gauss—they first pressurized a sample of liquid deuterium (a hydrogen isotope) then caused a jolt of current from the Z machine to move through an electrode, which in turn hit the front of the container holding the deuterium—that caused a shockwave to move through the sample, condensing it further. As the material was condensed, the researchers measured how well the sample reflected light, a common means for identifying a metal. As the sample was condensed, it moved from a transparent state, to one that was reflective. This, the team claims, shows that the material clearly moved from an insulator to a metal.The results by this new team are the closest yet to creating solid metallic hydrogen and add further proof that it can be done, if the right means are applied. It will also likely rekindle efforts by others to be the first to reach the goal.last_img read more