Damage to a store is revealed after the stolen truck, which was driven through a crowd outside a department in Stockholm. Photo: AFPFlags flew at half-mast across Stockholm on Saturday as the city slowly returned to normal a day after a truck attack that killed four people, as police said they had the suspected driver in custody.A stolen beer truck ploughed into a crowd of people at the corner of the bustling Ahlens department store and the Drottninggatan pedestrian street on Friday afternoon, above ground from Stockholm’s central subway station.Fifteen people were injured, nine of whom remained in hospital on Saturday.It was the third terror attack in Europe in two weeks, coming on the heels of assaults in London and St. Petersburg, although there has been no immediate claim of responsibility.Previous attacks using vehicles have occurred in London, Berlin and the southern French city of Nice, all of them claimed by the so-called Islamic State (IS).”Terror hits the heart of the city,” Sweden’s biggest broadsheet Dagens Nyheter headlined its front page above a picture of the truck with its front end smashed into the store.Prime Minister Stefan Lofven said he had strengthened the country’s border controls, as flags flew at half-mast at parliament, the royal palace, the government offices, and City Hall.”Terrorists want us to be afraid, want us to change our behaviour, want us to not live our lives normally, but that is what we’re going to do. So terrorists can never defeat Sweden, never,” Lofven said.City streets were empty early Saturday, slowly filling as the day wore on as things began to return to normal — apart from a heavy police presence, a rare scene in this normally tranquil country.A swelling crowd milled by the security barrier erected around the scene, many placing flowers on the ground or in the security fence.Sweden’s Crown Princess Victoria, 39, was one of those laying down a bouquet, wiping tears from her cheek.”I feel an incredible sadness, an emptiness,” she told reporters.But, she said, “society has demonstrated enormous strength and we stand together against this.”Suspected driver in custody Swedish police said a man arrested on “suspicion of a terrorist crime” was probably the truck driver.”We suspect that the man who was arrested is the perpetrator,” Stockholm police spokesman Lars Bystrom told AFP.The man was arrested “on suspicion of a terrorist crime through murder,” Karin Rosander, spokeswoman at the Swedish Prosecution Authority, said.The man was detained on Friday in Marsta, a suburb north of Stockholm. According to several media outlets, he is a 39-year-old of Uzbek origin and an IS supporter.Prosecutors did not disclose his identity, but police said his appearance “matched the description” of a photo they released of a suspect wearing a dark hoodie and military green jacket.Intelligence agency Sapo said meanwhile it was hunting for “possible accomplices or networks that may have been involved in the attack.” ‘Terrifying’ Witnesses described scenes of terror and panic on Friday.”A massive truck starts driving … and mangles everything and just drives over exactly everything,” eyewitness Rikard Gauffin told AFP.”It was so terrible and there were bodies lying everywhere… it was really terrifying,” he added.Passerby Hasan Sidi told Aftonbladet he saw two elderly women lying on the ground.He said people at the scene urged him to help one of the women who was “bleeding to death”.”One of them died… I don’t know if the other one made it,” Sidi said.The truck was towed away in the early hours of Saturday. ‘It was expected’ An attack on Stockholm was just a matter of time, the head of the Centre for Asymmetric Threat Studies at the Swedish National Defence College, Magnus Ranstorp, told AFP.”It was pretty expected, the police and intelligence agency have practised for this several times the past year… We just didn’t know when it was going to happen,” he said.Friday’s attack was the latest in a string of assaults with vehicles in Europe.The deadliest came last year in France on the July 14 Bastille Day national holiday, when a man rammed a truck into a crowd in the Mediterranean resort of Nice, killing 86 people.In December, a man hijacked a truck and slammed into shoppers at a Christmas market in Berlin, killing 12 people.In London last month, Khalid Masood, a 52-year-old convert to Islam, killed five people when he drove a car at high speed into pedestrians before launching a frenzied knife attack on a policeman guarding parliament.In 2014, IS called for attacks on citizens of Western countries and gave instructions on how they could be carried out without military equipment, using rocks or knives, or by running people over in vehicles.Friday’s attack was the second terror attack in Stockholm.In December 2010, a suicide bomber blew himself up, also on the Drottninggatan pedestrian street, lightly injuring several passersby.
Citation: Next-generation cameras inspired by fruit flies and moths (2006, May 11) retrieved 18 August 2019 from https://phys.org/news/2006-05-next-generation-cameras-fruit-flies-moths.html Explore further Today’s digital micro-cameras and other optical devices use lenses based on human-type single aperture eyes. These lenses, which are manufactured with macroscopic technology, do not get thinner than about 5 mm. However, insects such as fruit flies and moths have a completely different type of eye called compound eyes to accommodate the animals’ small size and low brain processing capabilities. Compound eyes consist of up to tens of thousands of tiny sensors called “ommatidia” that detect light and sometimes color. Flies and moths see images made of a combination of inputs from the ommatidia that point in different directions, forming a large field of view while the total volume consumption remains small. To fabricate the first type of compound eye, called an apposition compound eye and found mainly in diurnal insects such as flies, the scientists used photolithography to arrange a microlens array on a thin silicon wafer. Acting as ommatidia, the microlenses could be specially tuned to improve homogenous resolution over the entire field of view. Further, the scientists found that the large focal depth of apposition compound eyes cancels the need to adjust lens focus for distant or near objects.The second type of compound eye, found mainly in nocturnal insects such as moths and deep water crustaceans such as shrimp, have greater light sensitivity than apposition compound eyes. Comprised of an array of microtelescopes, these eyes are known as superposition compound eyes or simply cluster eyes. Using reactive ion etching to transfer the microlenses onto fused silica, the scientists fabricated cluster eyes whose individual lenses also improved resolution homogeneity. Compared with apposition compound eyes, cluster eyes require thicker objectives but offer higher resolution. Both types have potential for use in tiny cameras.“Deciding between the apposition and cluster eyes depends on the required resolution vs. compactness vs. price,” said Duparre. “The apposition eye will be cheaper and smaller but have lower resolution. It thus will more work like an imaging optical sensor, while the cluster eye could actually be used to present images directly to a customer, but is more complex.”These advantages of artificial compound eyes were discovered despite one major technical drawback: both types of compound eyes were arranged on a flat surface, while the curved base of natural insect eyes offer several advantages. Hopefully, a special type of laser beam writer currently being developed could fabricate compound eyes on curved surfaces.Citation: Duparre, J. W. and Wippermann, F. C. Micro-optical artificial compound eyes. Bioinspiration and Biomimetics. 1 (2006) R1-R16.By Lisa Zyga, Copyright 2006 PhysOrg.com The fruit fly has apposition compound eyes, which scientists have fabricated using photolithography to arrange and tune an array of microlenses. The microlenses act as “ommatidia,” the insect’s tiny eye sensors. Photo credit: IOP. Inspired by the way that nature has evolved the eyes of small insects, scientists have fabricated artificial compound eyes that could make camera lenses tiny enough to fit on credit cards or stickers. “While human eyes use a spherical volume, compound eyes use only a spherical shell, so that much of the space and weight is saved for the brain,” Jacques Duparre, coauthor with F. C. Wippermann of a recent paper in Bioinspiration and Biomimetics, told PhysOrg.com. “The arrangement allows for a large field of view, but does not require large signal processing.”Although single aperture eyes have advantages in resolution and sensitivity in large lenses, compound eyes have the potential to make more compact, robust and cheap vision systems. At the micro level, compound eyes’ individual viewing channels on curved lenses have minimal aberrations, or focusing errors that cause blurring. Cameras with compound eye lenses could have applications in many tight spaces, such as those encountered in automotive engineering, security and surveillance, and medical technology.“Thin lenses might have applications in flat panel displays, and we’re also working on another arrangement for minimal invasive surgery,” said Duparre, who is currently working on a patent for this arrangement.Scientists have studied optical lenses based on natural compound eyes for more than a hundred years, but classical macroscopic technology has not provided the necessary fabrication and assembly accuracy. For the first time, Duparre and Wippermann have fabricated and tested two different compound eye lenses using state-of-the-art micro-optics technology. Scientists fabricated an artificial apposition compound eye (center) that is significantly cheaper and smaller than a traditional 20-mm single lens objective (left) with the same magnification; and much smaller – though not quite as cheap – as a Euro cent (right). Photo credit: IOP. Researchers develop liquid-crystal-based compound lenses that work like insect eyes 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.
Monday, July 9, 2018 ACV has more capacity and a brand new route for Winter 2018/19 Posted by Tags: Air Canada Vacations, New Routes Travelweek Group Share MONTREAL — Air Canada Vacations has revealed its new lineup for winter 2018/19 sun destination flights onboard Air Canada and Air Canada Rouge.The schedule includes a new route, new 737-MAX aircraft, increased frequency on most-requested routes and increased capacity in the fall.Here’s a look at what ACV will be offering for winter 2018/2019:NEW ROUTEACV’s brand new route, between Vancouver and Lihue, Hawaii, starts Dec. 15, 2018 and operates on Tuesdays, Thursdays and SaturdaysNEW 737-MAX AIRCRAFTAir Canada says its new 737 MAX aircraft feature technological advances for quiet, efficient and environmentally-friendly air travel. The following flights will be flown on the new aircraft: Vancouver and Calgary flights to Hawaii, Vancouver flights to Mexico and Calgary flights to CancunMORE FLIGHTS TO THE SUNFor winter 2018/2019 ACV will offer 58 new flights to the sun.From the West:29 additional flights per week, consisting of 20 to Hawaii (including double daily flights from Vancouver to each of Honolulu and Maui), three new flights from Vancouver to Lihue, two additional flights from Vancouver to Kona and one additional flight from Calgary to Maui.There are nine additional flights to Mexico including three additional flights from Calgary to Puerto Vallarta (now four flights weekly), two additional flights from Calgary to Los Cabos (now three times weekly) and 2 additional flights from Vancouver to each of Ixtapa (now three times weekly) and Cancun (now four times weekly).More news: Air Canada’s global sales update includes Managing Director, Canada & USA SalesFrom Ontario:19 additional flights per week including three additional flights from Toronto to Liberia (now daily service), three additional flights from Toronto to Cancun (now 17 flights per week), two additional flights from Toronto to Los Cabos and one additional flight from Toronto to each of Cartagena, Curacao, Grenada, St. Vincent, Belize City, Honolulu, Aruba, Bermuda and Kingston.From Ottawa, Air Canada will feature an additional flight to each of Punta Cana and Cancun.ACV will also be resuming service from Toronto to St. Maarten on Dec. 15 and San Juan on Oct. 28.From Quebec:10 additional flights per week including 2 additional flights from Montreal to each of Cancun (now 14 flights per week) and Liberia (now three times per week) and one additional flight from Montreal to each of Curacao, Montego Bay, San Jose, Puerto Vallarta, Cozumel and Martinique. Air Canada Vacations will be resuming service from Montreal to San Juan on Dec. 15.More news: Onex paying big to get WestJet and that will send airfares soaring, says CWTEARLY FALL PROGRAM:Three routes will commence in November this year, rather than mid-December:Montreal to Liberia will start Nov. 3Vancouver to Ixtapa will start Nov. 1Toronto to St. Kitts will begin Nov. 3In addition, nine flights will start in late October (Oct. 28 or 29) including:Vancouver to Cancun & Los CabosCalgary to Los CabosMontreal to Cayo Coco, Cozumel & Puerto VallartaToronto to Cozumel, Liberia & Los Cabos“Air Canada Vacations is pleased to demonstrate its commitment to the travel trade by offering consumers the ability to access our packaged vacations with so many more flight options from our top gateways across the country,” says Nino Montagnese, Managing Director, Air Canada Vacations. “We know the travelling public wants options, and we are excited to be able to provide them.” << Previous PostNext Post >>