RelatedPosts Neymar bags two-match ban Neymar risks seven-game ban, Gonzalez 10 Neymar, four others sent off as Marseille grab rare win at PSG Neymar has returned to Paris after three months in Brazil ahead of Paris Saint-Germain’s planned return to training on June 22.PSG were crowned French champions for the third successive season after the Ligue 1 campaign was cut short, but they are looking to prepare for two domestic cup finals and the potential return of the Champions League. Thomas Tuchel’s side qualified for the quarter-finals after beating Borussia Dortmund 3-2 on aggregate, with their 2-0 home victory on March 11 being one of the last top-level games played in Europe before lockdown.Neymar went home to Brazil four days after that game as lockdown restrictions were introduced in France.Now he has followed advice from PSG to return to France before June 15 in order to avoid a potential two-week quarantine.European countries could review their conditions for entering the country from that date.It has been widely reported that Brazil has now passed the United Kingdom to record the second-highest coronavirus death toll in the world, and arrivals from badly-hit countries are likely to face stricter restrictions if policy changes are made in France. PSG have a number of South American players in their ranks, many of whom returned home when lockdown began.Edinson Cavani, Keylor Navas and captain Thiago Silva are all expected to return to France before Tuesday, with Marquinhos having already done so.Despite the disappointment of the league campaign being curtailed, PSG are still hopeful of securing a historic quadruple this season.They are set to face Saint-Etienne in the Coupe de France final, as well as playing Lyon in the final of the Coupe de la Ligue.Neither match has a confirmed date at this point. Meanwhile, plans are still being put together to try and finish the Champions League.PSG qualified for the quarter-finals alongside RB Leipzig, Atletico Madrid and Atalanta.The remaining last-16 ties between Real Madrid and Manchester City, Chelsea and Bayern Munich, Lyon and Juventus as well as Napoli and Barcelona are all yet to be completed.Tags: Borussia DortmundLockdownNeymarParis St. GermainThomas Tuchel
This semester, the entirely-student run Liquid Propulsion Lab team hopes to trial , a larger 3-D-printed engine. (Jan Fessl / Daily Trojan)After months of designing, planning and spending, the USC Liquid Propulsion Lab fired the world’s first student-made 3-D-printed rocket engine a month ahead of schedule. The engine, named James, was made entirely on campus, a feat not accomplished before by any student group around the world, according to USC News. The parts constituting James were constructed at the USC Viterbi Center for Advanced Manufacturing and taken to USC’s machine shop for finishing. “The reason we chose this particular material is because it qualified with the temperature and pressure qualities that we needed,” said Nihar Patel, a second-year graduate student studying aerospace engineering and engineering management, as well as the designer on the larger Balerion engine. However, printing occurs after a long process of computer-automated design of each individual part. Computer-automated design allows engineers to create designs using vector-based graphics. The design for the smaller engine took nearly a semester. “[Printing] opens up a door to a vast majority of design that is not available with traditional [manufacturing] and it really opens up a designer’s creativity,” Patel said. While the printing process was tedious, Patel said it outshined traditional manufacturing in both time and cost efficiency. According to Patel, additive manufacturing allowed the student researchers to make small changes on their computer and begin a reprint immediately, while traditional processes could take months. “The additive manufacturing process allows to create a lot of components that are more complex,” said Emily Dzurilla, a second-year graduate student studying astronautical engineering who assisted on the final design of the engine. “It also allows us to get them faster than traditional machining.” During the test, which took place in the Mojave Desert in November, the engine produced 600 pounds of thrust along with 725 pounds of pressure in its holding chamber. The engine is a liquid propulsion engine — the only kind that LPL crafts, which incorporates a more complex engine that allows for variable thrust and easily repeatable tests. In addition to James, LPL has also engineered 3-D printed engine Balerion, which can produce 2,250 pounds of thrust. Testing for the engine will occur in the spring. “[Balerion] is about two to three times bigger [than James] and can produce a max of 10 kilonewtons,” said German Padilla, the engine design engineer and a second-year graduate student studying astronautical engineering. Though LPL is relatively new on campus, it has experienced an increasing amount of notoriety due to its recent feats. Its work was presented at the American Institute of Aeronautics and Astronautics Propulsion Conference over the summer. In October, the designs of the 3-D-printed engine were presented at the International Aeronautical Congress in Bremen, Germany. “The other day, we had SpaceX engineers come and tour the lab … we’re getting the attention from the big companies,” Padilla said. “It opens up a lot of connections and possibilities of future employment.” As the lab enters its fourth year, the LPL team plans to trial fire Balerion sometime in the spring, while simultaneously working on making testing of James more efficient. “We’re very focused on doing good work and setting really ambitious goals. We want to be able to produce the best engineers out of our lab,” Dzurilla said.
By Sid PerkinsFeb. 7, 2018 , 4:00 PM Moon’s unusual bulge may indicate early Earth had no ocean NASA Goddard It’s not just dads with beer bellies: Many objects in our solar system sport a bulge around their midsections, caused by fast rotations that tend to fling material outward at equatorial latitudes. But our moon’s rotational bulge—an equatorial diameter that would be, on average, about 200 meters longer than its diameter through the poles if the moon weren’t so cratered with huge basins—is about 20 times larger than expected, based on its current once-per-month rate of rotation. Now, researchers may have an explanation. A first-of-its-kind computer simulation suggests that the moon’s outer layers, and thus its rotational bulge, largely froze into their current shape to preserve the inordinately large rotational bulge about 4 billion years ago. Before that time, the moon’s spin rate was higher, the researchers report today in Geophysical Research Letters. The team’s model suggests that stems from a slower deceleration rate for Earth’s spin at the time, which affected the total amount of rotational momentum in the Earth-moon system and thus how rapidly the moon’s spin rate decelerates, among other things. And the fact that Earth’s spin rate wasn’t slowing down as quickly then as it is today hints that our planet had little or no ocean to slosh about and slow down our planet’s spin rate for its first 500 million years, the findings suggest. Or, the researchers propose, any ocean that did exist was largely frozen, possibly because of the sun’s 30% fainter output of radiation at the time.