Carbon-fiber epoxy honeycombs mimic the material performance of balsa wood

first_img Read Full Story In wind farms across North America and Europe, sleek turbines equipped with state-of-the-art technology convert wind energy into electric power. But tucked inside the blades of these feats of modern engineering is a decidedly low-tech core material: balsa wood.Like other manufactured products that use sandwich panel construction to achieve a combination of light weight and strength, turbine blades contain carefully arrayed strips of balsa wood from Ecuador, which provides 95 percent of the world’s supply.For centuries, the fast-growing balsa tree has been prized for its light weight and stiffness relative to density. But balsa wood is expensive and natural variations in the grain can be an impediment to achieving the increasingly precise performance requirements of turbine blades and other sophisticated applications.As turbine makers produce ever-larger blades—the longest now measure 75 meters, almost matching the wingspan of an Airbus A380 jetliner—they must be engineered to operate virtually maintenance-free for decades. In order to meet more demanding specifications for precision, weight, and quality consistency, manufacturers are searching for new sandwich construction material options.Now, using a cocktail of fiber-reinforced epoxy-based thermosetting resins and 3D extrusion printing techniques, materials scientists at the Harvard School of Engineering and Applied Sciences and the Wyss Institute for Biologically Inspired Engineering have developed cellular composite materials of unprecedented light weight and stiffness. Because of their mechanical properties and the fine-scale control of fabrication (see video), the researchers say these new materials mimic and improve on balsa, and even the best commercial 3D-printed polymers and polymer composites available.last_img read more

Security cameras help Salvadoran police fight street gangs MS-13 and Barrio 18

first_img The surveillance cameras will help security forces keep track of the criminal activities of the two largest gangs in El Salvador – Mara Salvatrucha, which is also known as MS-13, and Barrio 18, which is also known as 18th Street and M-18. Both of these gangs engage in killings, extortion, armed robbery, kidnapping, and micro-trafficking of drugs. Mara Salvatrucha and Barrio 18 have both formed alliances with international drug trafficking groups, such as the Sinaloa Cartel and Los Zetas, which operate in El Salvador and other parts of Central America. The gangs help drug cartels transport cocaine and other drugs north to Mexico, the United States, and other destinations. The Sinaloa Cartel and Los Zetas, two Mexican transnational criminal organizations, have expanded their operations in recent years in El Salvador, Guatemala, and Honduras. Monitoring MS-13 and Barrio 18 Training, coordination, and intelligence Technology is essential to the security forces of any nation, Aviles said. For example, London has used closed-circuit television cameras (CCTV) for years to monitor the streets of the city. The new cameras will be phased in, authorities said. The first phase began May 20, when authorities began installing 360 security cameras, which the National Civil Police (PNC) will use to monitor city streets for criminal activity, according to the Ministry of Security. Each surveillance camera can cover as much ground as 22 police officers on patrol, Jose Ricardo Perdomo, the minister of justice and public security, told reporters the day authorities began installing the devices. Authorities installed many of the cameras on streets that led into and out of San Salvador. “In the past, it was easier to point to specific areas that could be dangerous. Unfortunately, crime is spreading geographically,” Aviles said. “San Salvador is a sensitive area again.” The government plans on placing up to 6,500 cameras in the capital city and outlying areas. Images captured by the security cameras can be stored in a database for up to eight years. Authorities will be able to use images to monitor crimes as they occur, to identify potential criminal suspects and victims, and to check the registration of vehicle license numbers. Each camera has a range of about 800 meters. The ability of cameras to cover large amounts of territory will allow police who monitor the cameras to conduct “virtual patrols.” The cameras will send images to the PNC’s central command and control center. PNC authorities will monitor the images to respond to dispatch officers to crimes in progress and to gather intelligence. A pledge to fight crime Using technology to fight crimecenter_img On June 10, Minister of Justice and Security Benito Lara pledged the government is doing everything it can to fight crime and improve security.in every part of El Salvador. “Our policy is clear, we will develop everything in our power to combat crime. We will deploy more police officers in areas where gangs operate,” Lara said. The combination of improvements in technology and cooperation between the police and the residents of El Salvador should lead to improvements in public safety, Aviles said. “Any action to prevent insecurity and violence brings results,” he said. “In the near future the crime reduction is expected.” The security cameras are an important tool in the fight against crime, but they are part of a larger effort which involves improved training, intelligence gathering, and cooperation between citizens and the PNC, as well as between Salvadoran and U.S. security forces, according to Aviles. “Technology alone will not solve the problem of gangs or organizations of transnational organized crime,” Aviles said. “Technology needs to be accompanied by good training for all members of the security forces, equipment, weapons, vehicles, advanced communication, coordination and intelligence to successfully combat these criminal organizations.” Before they began installing large numbers of security cameras, authorities tested the surveillance system by installing a small number of the devices in San Salvador, according to the Ministry of Security. Those first cameras helped police capture a gang of car thieves, stop a drug transaction, and identify extortion suspects. Video and images from security cameras can be important tools in the fight against crime, Aviles said. Police and prosecutors can use video and photographic images from security cameras to identify criminals and bring them to justice. Video and photographic evidence can be crucial in criminal trials. The security camera system cost more than $5 million (USD), according to the Ministry of Justice and Public Safety. The camera surveillance system is equipped with the most sophisticated technology available and is protected against cyber-attacks. Salvadoran authorities are increasing their use of technology to fight crime. For example, authorities have blocked cellphone service at 10 prisons throughout the country to fight crime. Cellphones are prohibited inside prisons, but some incarcerated gang leaders have had friends or relatives smuggle the devices to them inside prison. The gang leaders have used the smuggled cellphones to direct the criminal activities of their gangs. Providing the best in technology is part of government’s broad strategy to fight gangs, international drug trafficking groups, and common criminals. In addition to the surveillance camera system, the government in recent years has provided the PNC an automated ballistics and fingerprint identification system, which helps police conduct criminal investigations. By Dialogo July 21, 2014 Salvadoran authorities plan to install more than 6,000 security cameras in the capital city of San Salvador and outlying areas in the coming months to improve public safety. The cameras will help security forces monitor and confront violence by gangs, transnational criminal organizations, and common criminals, according to Educational Foundation for the Prevention of Drug Abuse (FORESEE) executive director Carlos Aviles. “The use of video surveillance cameras will enhance the effectiveness of law enforcement against drug trafficking, extortion, kidnapping, common crime, theft and other emerging threats,” Aviles said. “It will strengthen (crime) prevention in San Salvador.” last_img read more

Democratic Party declares support for Jokowi’s son in Surakarta mayoral race

first_imgRead also: PDI-P may pair Gibran and Achmad for Surakarta mayoral raceMeanwhile, the Prosperous Justice Party (PKS), National Awakening Party’s (PKB) and United Development Party (PPP) have also openly showed their support for Gibran’s election bid.Gibran is not the only presidential relative gearing up to run the upcoming regional elections – Jokowi’s son-in-law Bobby Nasution is also seeking support for his own mayoral bid in Medan, North Sumatra.Gibran and Bobby’s planned runs have triggered concerns that the former Surakarta mayor is building up a political dynasty, an accusation that Jokowi has denied. (hol) Read also: Jokowi vows he ‘won’t be campaigning’ for son, son-in-law in upcoming mayoral races Topics : The Surakarta chapter of the Democratic Party has declared its support for President Joko “Jokowi” Widodo’s eldest son, Gibran Rakabuming Raka, in the upcoming Surakarta mayoral election in Central Java. Supriyanto, the head of the Democratic Party’s Surakarta chapter, said the party decided to back Gibran because he was a young figure who they believed could carry out programs quickly and on target.“We support him unconditionally, because we want a fresh government,” Supriyanto said on Wednesday as quoted by kompas.com.center_img He said that former president and Democratic Party chairman Susilo Bambang Yudhoyono had also expressed his support for Gibran through the party’s Central Java provincial chapter.“We have given assurances to the people of Surakarta that Gibran is capable of leading the Surakarta administration,” Supriyanto added.Interviewed separately, Gibran said he would take all the help that he could get. “I welcome all the support, from the parties, volunteers, citizens and everyone,” Gibran said.Besides the Democrats, Gibran has also courted the support of his father’s Indonesian Democratic Party of Struggle (PDI-P), which is considering pairing Gibran and Surakarta Deputy Mayor Achmad Purnomo, who had been tabbed as the party’s nominee before Gibran threw his hat into the ring.last_img read more

Soekarno-Hatta Airport packed with passengers despite government call for physical distancing

first_imgSoekarno-Hatta International Airport in Tangerang, Banten, Indonesia’s main airport, was reportedly packed with passengers on Thursday morning despite the government’s call for physical-distancing protocols in public.Social media users posted pictures of the scene at the airport’s Terminal 2 with passengers lining up from early in the morning.“The atmosphere at Terminal 2 of Soekarno Hatta Airport on Thursday morning,” @jktinfo said on its Instagram account on Thursday, referencing a photograph taken by Instagram user @fahlevi.rezaaa. Other social media users also criticized the government, airport management and the congregating passengers for failing to enforce or follow social-distancing measures to prevent COVID-19 transmission.“The combination of the indiscretion of the Indonesian government and its opportunist and reckless citizens will make this country the last to survive this pandemic,” Twitter user @adriansyahyasin posted on Thursday.Kombinasi ketidakbijaksanaan pemerintah Indonesia dan rakyatnya yang oportunis dan gegabah akan membuat negeri ini yang terakhir selamat dari pandemi ini.Berdamai dengan virus katanya, udah McD sekarang ini Bandara CGK 🤦‍♂️ pic.twitter.com/euxy9ENvyH— Adriansyah Yasin Sulaeman (@adriansyahyasin) May 14, 2020“Quite a struggle using flight services in the COVID-19 period. Lining up for more than three hours [where] procedures to keep a distance were not enforced. Can AP [airport operator PT Angkasa Pura II] review […] whether social distancing applies at the airport,” Twitter user @HrytoRicky also posted on Thursday.Cukup berat perjuangan Menggunakan jasa Penerbangan di masa Covid 19 ini, antrian lebih 3 jam, SOP Antrian dgn jaga jarak ternyata tidak berlaku….. mohon di review pihak AP…. apakah dgn cara berdesakan menjadi pembiaran….social distancing apakah berlaku di bandara…. pic.twitter.com/JJdShp13PU— Rick (@HrytoRicky) May 13, 2020Responding to the reports, Angkasa Pura II communications manager Febri Toga Simatupang said that the crowding of passengers occurred at 4 a.m., that it only lasted until 5 a.m. and was caused by an influx of passengers coming for morning flights where 13 departures were scheduled between 6 a.m. and 8 a.m. The passengers were lining up to get all their flight documents checked as additional requirements, such as a negative COVID-19 polymerase chain reaction (PCR) test or rapid test result, or health documents from a hospital or clinic, as well as a return ticket, are required to fly during the currently indefinite COVID-19 mitigation period.Febri went on to say that the airport officials were overwhelmed by the large number of passengers seeking to get their flight documents checked.“As of now, there are no more lines at Terminal 2. We always try to maintain physical distancing in every area. The application of physical distancing in Soekarno-Hatta will also be evaluated periodically to see the current situation and conditions, which are quite dynamic,” Febri said in a written statement published on Thursday, adding that flight schedules would also be evaluated.To prevent people from going on the Idul Fitri mudik (exodus) and to curb COVID-19 transmission, the Transportation Ministry decided to suspend intercity flights for passengers from April 24 to June 1.Read also: Indonesia suspends all passenger travel across cities to prevent Ramadan exodusHowever, the national COVID-19 task force relaxed the restriction on May 6, allowing state officials, private-sector and state-owned enterprises (SOEs) employees who provide essential services, repatriated Indonesian nationals, individuals who need emergency medical care and family members of a deceased person to travel between cities.Following the regulations, airlines announced that they would gradually resume domestic flight services with stricter health protocols, such as requiring pre-flight medical checkups and a letter explaining reasons for travel from a relevant institution.The Transportation Ministry has also limited the passenger capacity of flights, down to 50 percent of the normal flight capacity to help physical distancing and reduce COVID-19 transmission risks.Air Transportation Director General Novie Riyanto reminded travelers that “strict sanctions” would apply to airlines violating the passenger limits as the directorate general had received complaints about violations.“This morning, we immediately followed up [the complaints] by ordering flight inspectors to carry out further investigations into this matter,” Novie said in a written statement on Thursday. “We remind airlines not to make mistakes that put their passengers at risk. The health protocols must be implemented by all aviation stakeholders.” (mfp)Topics :last_img read more

Rookie Megna lifts Penguins past Canes, 3-1

first_imgPittsburgh Penguins’ Jayson Megna (59) and Brandon Sutter (16) look for a shot against Carolina Hurricanes goalie Justin Peters (35) as Hurricanes’ Justin Faulk (27) defends during the first period of an NHL hockey game in Raleigh, N.C., Monday, Oct. 28, 2013. Hurricanes’ Andrej Sekera (4), of Slovakia looks for possession at left. (AP Photo/Gerry Broome)  by Joedy McCrearyAP Sports WriterRALEIGH, N.C. (AP) — When he eventually tells the story of his first career goal, Pittsburgh rookie Jayson Megna won’t embellish any of the details. Sidney Crosby did set it up, and it did ice a victory that ended a losing streak.That it clicked in off his shin pad? No big deal.Megna scored his first goal on a deflection after he also earned his first assist, helping the Penguins snap a three-game slide by beating the Carolina Hurricanes 3-1 on Monday night.“I told him, ‘That’s not the way you usually dream of scoring your first one,’” Crosby said. “But you take them any way you can get them.”Chris Kunitz and Tanner Glass also scored for the Metropolitan Division-leading Penguins. Brooks Orpik had three assists, Crosby added two and Marc-Andre Fleury stopped 20 shots.Pittsburgh ended its longest losing streak since 2011-12 by defeating the Hurricanes for the fourth straight time.“We had some lapses for periods (during the slide) and that hurt us and ended up costing us the game,” Crosby said. “When you do good things, you don’t want to spoil it with some errors that were mental errors, and we bounced back here tonight and got a big win.”Nathan Gerbe scored a power-play goal for Carolina, which lost its third straight. The Hurricanes remained tied with the New York Islanders for second in the division — five points behind the Penguins — after putting just three shots on Fleury in the third period.“We kind of got pushed out of the game. We weren’t able to generate anything in the third period,” coach Kirk Muller said. “Prior to that, they played a heavier game than we did. They won more battles. They grinded it harder, and their big boys at the end of the night were on the scoresheet. … Some of our guys have to start contributing.”Carolina’s Justin Peters made 26 saves in his second straight start in place of the injured Cam Ward.Ward is expected to miss at least two more weeks after sustaining an unspecified lower-body injury during a loss at Minnesota last week, and including that game, the Hurricanes have lost all three games since he was hurt. Carolina has allowed at least three goals in four straight.“He battled. He played hard,” Muller said of Peters. “We broke down on a couple mistakes that cost us goals, and we had opportunities to capitalize almost similar plays and we didn’t capitalize.”Offense had become a bit tougher to find for the Penguins, which scored 13 goals in its previous two victories over the Hurricanes — including a 5-2 win earlier this month in Pittsburgh keyed by a hat trick from former Hurricane Jussi Jokinen.During the losing streak, the Penguins averaged 38 shots but managed four total goals.Kunitz scored the go-ahead goal with 3:36 left in the second, cashing in on some nifty cross-ice passing, taking a feed from Crosby and beating Peters high to make it 2-1.Megna — a 23-year-old undrafted center playing in his second career NHL game — then made it a two-goal game with 12:49 left.A Crosby shot clicked first off a Carolina defender, then off Megna’s right leg and into the net — and the occasion was marked by the inadvertent sounding of the PNC Arena goal horn.“Shot it right off my shin pad,” Megna said. “Not how I dreamed it up, but I’ll take them any way I can get them.”Megna’s first career point came on the Penguins’ first goal. Glass put them up 1-0 at 8:25 of the first off a neutral-zone draw, whipping the rebound of Megna’s shot past Peters. Both of Glass’ goals this season have come against the Hurricanes.Gerbe tied it at 16:03 with a 5-on-3 goal, finishing from point-blank range after some tic-tac-toe passing from Alexander Semin and rookie Elias Lindholm.That came after Pittsburgh had the game’s first nine shots on goal. Carolina didn’t put its first shot on Fleury until Ron Hainsey’s soft backhand with about 8½ minutes left drew some sarcastic cheers from the crowd.The Penguins had a lull of their own in the second, failing to put a shot on Peters until Megna landed one about 8½ minutes in.NOTES: Crosby has at least one point in 10 of Pittsburgh’s 12 games. … Semin has points in four straight games. … The Penguins scratched D Rob Scuderi with a lower-body injury, ending his streak of 276 consecutive regular-season games played — the longest streak on the team.___Follow Joedy McCreary on Twitter at http://twitter.com/joedyaplast_img read more