Escrito por  2016-09-21

Coco ajuda a projetar edifícios antiterremoto

(0 votos)

Duro na queda

Engenheiros e cientistas dos materiais da Universidade de Freiburg, na Alemanha, juntaram-se para tentar explorar a estrutura natural do coco em benefício da arquitetura e da construção civil.

Coqueiros podem ter 30 metros de altura, o que significa que, quando os cocos maduros caem no chão, suas paredes têm de suportar o impacto para que eles não rachem.

Para proteger a semente lá dentro, o coco tem uma estrutura complexa formada por três camadas principais: a casca externa que lembra a estrutura do couro, um mesocarpo fibroso e um resistente endocarpo interno em torno da polpa que contém a plântula em desenvolvimento.

"Analisando o comportamento de fratura das amostras e combinando isso com o conhecimento sobre a anatomia da casca obtida por microscopia e tomografia computadorizada, estamos identificando as estruturas mecanicamente relevantes para absorção de energia," explicou Stefanie Schmier, membro da equipe.

Desvio das fraturas

Os dados revelaram que, dentro do endocarpo - que consiste principalmente de células altamente lignificadas - os vasos que compõem o sistema vascular do fruto têm um design diferente, parecido com uma escada, responsável por suportar as forças de flexão.

Cada célula é rodeada por diversos anéis lignificados, unidos por pontes paralelas - a lignina é uma molécula associada à celulose na parede celular para dar rigidez aos tecidos vegetais.

A equipe acredita que é o ângulo desses vasculares que ajuda a "desviar" a trajetória das fissuras - quanto mais tempo uma rachadura tem que viajar para dentro do endocarpo, mais provável é que ela vai parar antes de chegar ao outro lado.

Prédios antiterremoto

A equipe acredita que essa angulação especial dos feixes vasculares no endocarpo do coco pode ser aplicada ao arranjo de fibras têxteis no interior do concreto para permitir a deflexão de fendas e rachaduras, evitando o colapso da estrutura.

"Esta combinação de uma estrutura leve com uma elevada capacidade de dissipação de energia é de interesse crescente para proteger edifícios contra terremotos, quedas de rochas e outros perigos naturais ou provocados pelo homem", disse Stefanie.

socialshare

share on facebook share on linkedin share on pinterest share on youtube share on twitter share on tumblr share on soceity6

24612 comentários

  • Timmy

    Gloomy tales http://www.quietcorners.com/where-to-buy-alli-online.pdf alli printable coupon april 2013 In the union's email, it told the players that Dr. Alan Rogol has been jointly hired by the NFLPA and NFL to oversee the study and supervise two jointly retained biostatisticians. One of those biostatisticians, Donald Berry, will design the study protocol and conduct the analysis. The second will independently review both the protocol and the analysis.
    http://www.wessmith.com/cialis-price-thailand.pdf#of cialis copay card The Vradiyivka affair is casting fresh light over widespread police impunity in Ukraine, where law enforcement agencies have long been riddled with corruption and the lack of functioning courts and other state institutions regularly enable enterprising officials to escape prosecution for crimes ranging from extortion to murder.
    http://www.quietcorners.com/dapoxetine-framar.pdf#classic dapoxetine framar Ofcom said the proposed new fees for certain spectrum bands used by mobile network operators for voice calls as well as third and fourth-generation mobile data signals reflected market value based on other countries.
    http://www.studiomobius.co.uk/buy-zoloft-online.pdf#stripe 300 mg of zoloft for ocd Sadly, that’s unlikely. For now, the Obama administration is still scrambling to walk back President Barack Obama’s vow from last year about any use of chemical weapons “changing the calculus.” The administration is not likely to become substantially forward-leaning in Syria  no matter what outside pressure is brought to bear.
    http://www.puppetcraft.co.uk/index.php/cozaar-plus-100-12-5-mg.pdf cozaar mg The seaborne coal market is well supplied, but if the strike dragged on for months, it could reduce the surplus and push upprices in Europe, where much of Colombia's supply is consumedand buyers are already booking in fuel for the winter.

    Link do comentário Sábado, 23 Setembro 2017 01:01 postado por Timmy
  • Dallas

    I'm not interested in football http://deltacrp.com/index.php/donde-puedo-comprar-viagra.pdf 50 mg viagra prices So ironically, Schwartz was grilling Gross on SNY, home of the Mets, while Francesa was bashing the Yankees on YES, the Bombers’ TV home. The SNY report was quickly circulated on Twitter. Yet on WFAN/YES, Francesa kept hammering the Yankees. Either the report wasn’t brought to his attention or he chose to ignore it. Bad idea.
    http://www.egyediajandekok.info/best-way-buy-viagra-online.pdf how to take viagra 25mg SEOUL, Sept 30 (Reuters) - South Korea's industrial outputexpanded in August from the previous month at its quickest pacein nine months, data showed on Monday, bolstering third-quartergrowth prospects for Asia's fourth-largest economy.
    http://jazminycanela.com/viagra-patent-expiration-2015.pdf#blink female viagra brands india Rouhani, a cleric, was swept up in the 1979 Iran's Islamic Revolution as a firm opponent to the shah and became an ally and part of the inner circle of revolutionary leader Ayatollah Ruhollah Khomeini, serving in various roles in the government after Khomeini's ascension to power. Rowhani served as head of the Supreme National Security Council during the presidency of Akbar Hashemi Rafsanjani from 1989 to 1997, and was the country's top nuclear negotiator with the West from 2003 to 2005 during the administration of reformist leader Mohammad Khatami at a time the U.S. and other European allies grew concerned over Iran's nuclear program. He negotiated a temporary suspension in Iran's uranium enrichment activities before resigning in 2005 after hard-liner President Mahmoud Ahmadinejad took office.
    http://www.egyediajandekok.info/periactin-4-mg-for-weight-gain.pdf#delve cyproheptadine 4mg tablets In a study commissioned by SIA, research firm ISPO said that94 percent of Italians liked the idea of contactless mobilepayments for their speed and practicality and the fact that nocash or bank cards are needed as virtual cards are insteaddownloaded onto the phone using a special SIA app.
    http://www.formbysurveys.com/what-happens-to-a-woman-when-she-takes-viagra.pdf#tomato how long does viagra stay active in your system Dolans comments, which come during a bitter riff between CBS and one of the largest cable providers, Time Warner Cable,  are an unexpected public acknowledgement by a cable CEO about the possible shift in the television industry.

    Link do comentário Sábado, 23 Setembro 2017 01:00 postado por Dallas
  • Darron

    this is be cool 8) http://974-reunion.com/blog/cvs-viagra-generic.pdf viagra sale australia Mr Milburn drew comparisons between inner city areas of London which, after targeted Government help, now have twice as many schools getting top inspection grades as those in “Middle England places like Bournemouth and Berkshire”.
    http://dds-usa.com/why-cialis-stopped-working.pdf cialis cost at target Abidal had a liver transplant last April, ruling him out of the 2012 European Championships and keeping him away from football for a year. He returned to make a few appearances for Barcelona before leaving to join Monaco in the summer.
    http://asesunion.com/what-is-tretinoin-gel-usp-001-used-for.pdf#profound price retin-a .1
    Considered as the sum of its parts, the SHIELD is an amazing deal: a Tegra 4 device with 2GB of RAM, a 5-inch 720p screen, solid build quality, and the best controls in the business for $300. That's a price point that rivals the original Nexus 7 when compared to other devices. Of course, it's only a deal if you want it, and that's where the rest of this review comes into play.
    http://www.eehobbies.com.au/tretinoin-cream-usp-05.pdf#stranger retin-a micro 0.04 coupon The Democratic-led U.S. Senate on Tuesday voted to killRepublicans' latest attempts to modify an emergency governmentfunding bill, stripping proposed amendments from the spendingbill and sending back to the House a "clean" bill that wouldextend funding for government agencies until Nov. 15.
    https://colemantech.com/comprar-viagra-porto-alegre.pdf#worthless viagra generique belgique The white-and-blue CS100 test aircraft gently touched down in clear, chilly weather beside the Bombardier plant in Mirabel, Quebec, at 12:23 p.m. EDT (1623 GMT) before a crowd of employees, media and spectators.

    Link do comentário Sábado, 23 Setembro 2017 01:00 postado por Darron
  • Lenard

    We used to work together https://www.uvocommunication.co.za/what-works-best-viagra-levitra-or-cialis.pdf best site to buy viagra in canada No wonder that a recent Wells Fargo survey found that fewer than half of millennials ages 22 to 32 were socking away cash for retirement -- and that nearly 90% of those who weren't said lack of money was the reason.
    https://www.ezlearning.co.uk/cardura-xl-doxazosinum.pdf#long cardura xl doxazosinum "I voted against Vice Chairman Yellen's original nomination to the Fed in 2010 because of her dovish views on monetary policy," Senator Bob Corker of Tennessee said in a statement. "We will closely examine her record since that time, but I am not aware of anything that demonstrates her views have changed."
    http://www.shayariduniya.com/periactin-4mg-weight-gain.pdf#month what is cyproheptadine 4mg tablets used for "It seems like the majority of our affiliates in the state aren't seeking re-certification, so I don't think the KEA is an outlier or unique in this," Brey told the paper, adding that certification gives the union scant power over a limited number of issues they'd like a voice in.
    http://prime-mfg.com.au/cytotec-costo-en-farmacias-colombia.pdf cytotec 200 mcg tablet for abortion Hatch was speaking this morning at a "fiscal summit" convened by National Journal (video below) and he cited Clinton's experience  as a reason why the GOP holding the House and taking the Senate in 2014 would – wait for it – "help President Obama":
    https://nikitarinadi.com/suhagra-100-dosage.pdf suhagra tablets in india “The decision was wrong. It is a flawed decision in terms of content and timing and raises serious questions over the United States' readiness to provide strategic support to Egypt's security programs,” complained Egyptian Foreign Ministry spokesman Badr Abdellaty

    Link do comentário Sábado, 23 Setembro 2017 00:05 postado por Lenard
  • Hunter

    Could you ask him to call me? http://www.havis.fi/purchase-cialis-with-mastercard.pdf cialis generico e sicuro “It’s very fashionable to be bearish on China nowadays,”Marino Valensise, who oversees about $60 billion as chiefinvestment officer at Baring Asset Management Ltd., toldFrancine Lacqua in an interview on Bloomberg Television inLondon. “The reality is 7.5 percent is in line with an earliertarget and the five-year plan says 7 percent. This is an economywhich is maturing, so it’s natural and obvious that the rate ofgrowth will slow down.”
    http://vantaan-a-kilta.fi/aturan-minum-pil-viagra.pdf#probability viagra tablets online purchase Trading volume was heavier than usual as Friday marked theevent known as "quadruple witching," when stock index futures,stock index options, stock options and single stock futures allexpire on the same day. Trading increases as investors replaceor repurchase existing contracts.
    https://www.uvocommunication.co.za/what-works-best-viagra-levitra-or-cialis.pdf#mineral do i need to take viagra everyday The chant in question — "You Suck, A------" — is heard at Red Bull Arena every time the visiting team takes a goal kick. "YSA" has become so much of a tradition, that it has spread to other stadiums throughout the league.
    http://main-street-marketing.com/where-can-i-purchase-metformin.pdf generic metformin Given the spying accusations, France and Germany - the two most influential countries in EU policy - may succeed in getting member states to push ahead on negotiations with the parliament to complete the data regulations and make them tougher.
    http://www.marathondrilling.com/online-clomid-purchase.pdf clomid bodybuilding uk Caelan, of Brooklyn, New York, was last seen with his non-custodial mother on 02/21/2002. He has a scar on his forehead and his hair is braided. Caelan was last seen wearing blue jeans, a blue polo shirt and black "ACG" boots. He may be in need of medical attention. Mother and child may have traveled to Trinidad and Tobago.

    Link do comentário Sábado, 23 Setembro 2017 00:05 postado por Hunter
  • Shane

    Where are you from? https://www.ezlearning.co.uk/cardura-xl-doxazosinum.pdf#lazy cardura e10 msds Selig has often — and rightfully — been criticized for moving at a snail’s pace in resolving baseball’s problems. But in these final months of his commissionership — he insists he is going to retire at the end of next season, and those closest to him say that nothing will change his mind this time — there has been a new sense of urgency on Selig’s part to get it all right. One of the biggest issues to plague him during his stewardship over the game has been the quality of umpiring and the preponderance of blown calls — too often in the postseason before national TV audiences. The new instant-replay challenge system, which Selig announced Thursday, should go a long way to address that. Atlanta Braves president John Schuerholz, who headed up Selig’s committee on instant replay, called it “an historic moment for baseball” that will “give our managers the ability to help control calls that impact the game.”
    http://polili.com/ordine-dottori-commercialisti-padova-crediti-formativi.pdf cialis 20 mg price per pill Indeed, Watsa had already shown his investment chops by selling stock ahead of the 1987 stock market crash and buying Japanese puts - or rights to sell stocks at guaranteed prices - ahead of the Tokyo market's collapse in 1990.
    http://clubedeservicos.cra-rj.adm.br/kamagra-oral-jelly-gnstig-kaufen-paypal.pdf cheap kamagra uk next day delivery Following the alleged threats, Joint Terrorism law enforcement agents went to Onuoha's apartment in a suburban Los Angeles veterans' housing complex and found it empty, Gates said, except for a handwritten note taped to a closet door that read: "09/11/2013 THERE WILL BE FIRE! FEAR! FEAR! FEAR!"
    https://www.agath.com/generic-levitra-india.pdf generic levitra india "The delay caused by the Federal Housing Finance Agency is unconscionable, given the growing shortage of housing that is affordable for the lowest income Americans," said Crowley, whose organization is one of the plaintiffs.
    http://www.opiniastudenteasca.ro/cialis-5mg-forum.pdf#grow cialis australia price The United States had suggested an approach which appears inthe new text, exempting airlines based on routes rather thancountry, and based on a hard number of so-called "revenue tonkilometers" (RTKs) that gets reduced each year after 2014. Thatwould replace an earlier plan to exempt countries that accountfor less than 1 percent of global RTKs.

    Link do comentário Sábado, 23 Setembro 2017 00:05 postado por Shane
  • Damion

    I'm sorry, I'm not interested http://www.taigalyhty.fi/putiikki/quanto-costa-il-levitra-orosolubile-in-farmacia.pdf levitra rezeptpflichtig sterreich It’s a clean slate. Tesla appeals not only to the desire to drive a great car, but in the fundamental need to have a place worth spending those profits on: clean air on the way to the shopping mall, clean beaches and water on vacations, silent air to think&
    http://retrash.com/does-watermelon-work-like-viagra.pdf#expected how do you take viagra "The consensus view, which I share, is that the governmentcan remain shut down for a little while. They will come back andrevisit ahead of the debt ceiling debate. I think for now therewill be a cooling-off period."
    https://iifdc.org/index.php/proscar-finasteride-5-mg.pdf#debate propecia merck buy Senate and House leaders were working to bring the agreement to a vote on Wednesday. The Senate was expected to vote first in the late afternoon or early evening, followed by a possible House vote later in the evening.
    https://www.websitedesignmarketing.com/online-viagra-order-in-belgium.pdf#dear viagra side effects young men Birmingham Metropolitan College said that it was reversing the ban because it was “concerned that recent media attention is detracting from our core mission of providing high quality learning”.
    https://www.agath.com/generic-levitra-india.pdf#concealed buy branded levitra After the signing of the Camp David Accords in 1978, the military rapidly expanded into private industry and cultivated economic interests. Today, the military continues to control a slice of the economy and owns factories and businesses that compete with the private sector.

    Link do comentário Sábado, 23 Setembro 2017 00:05 postado por Damion
  • Norberto

    Remove card http://www.taigalyhty.fi/putiikki/amoxicillin-500mg-dosage-sinus-infection.pdf#hats novamoxin 500 mg amoxicillin uses Even more insulting is the idea that somehow people would not have been angry if those in politics hadn't gotten them all wound up with reports about the bonuses. If he really thinks the executives are entitled to the money – after taxpayers bailed out the company – why didn't he come right out and say so?
    https://rad-chiro.co.uk/trazodone-price-comparison.pdf#chorus trazodone information leaflet Back in the 1970s, when the Heath government set up the Prices Commission, there was a double-pronged strategy to tackle spiralling inflation. Pay was also frozen. Miliband has no intention of repeating this second part of the prescription. He wants to do the opposite, and force up pay. “Don’t get me wrong,” says the Labour leader, “it’s only gas and electricity prices I want to control.” But what then happens when bread and other food prices start to rise by more than people want? Does he intend to control the price of tomatoes as well?
    http://farmaciaciato.it/cost-of-himcolin-gel.pdf#campaign himalaya himcolin gel review "The thesis of ‘Sharkpocalypse’ is that shark populations worldwide are at an all-time low, and yet shark attacks are up," Joe Schneier, executive producer, told USA Today. "We tried to figure out if there was a connection."
    https://nikitarinadi.com/viagra-online-ohne-rezept-per-nachnahme.pdf viagra kaufen auf rechnung ohne rezept
    "We just love him so much. We think of him every day," said Danes, who thanked her cast and husband, actor Hugh Dancy, "for making me so whole and happy so I can be unhappy in the land of make-believe."
    http://www.basilicatapsr.it/dapoxetine-hplc.pdf tadalafil et dapoxetine That's because Medicare plans are typically private health insurance policies that are government-subsidized; nothing is completely covered and no expense is 100 percent paid-for. Though the subsidies paid to the insurance companies help keep costs low for seniors, the plans are varied and usually require the beneficiaries to pay some premiums.

    Link do comentário Sábado, 23 Setembro 2017 00:04 postado por Norberto
  • Terrell

    Is it convenient to talk at the moment? http://www.tidburygreen-pc.org.uk/misoprostol-for-sale.pdf#helpful cytotec 200 mcg tablet for abortion The biggest clashes over revising lending procedures involved the consumer bureau, which was charged with implementing key provisions of Dodd-Frank and was criticized as overly powerful by lenders and by Republicans in Congress.
    http://linea.fi/donde-comprar-viagra-argentina.pdf#subsequent donde comprar viagra argentina In some cases, the official said, agencies had moved morequickly to create such anti-leak squads than to install moreneutral and impersonal software systems designed to detectunauthorized access attempts. That process has sometimes createdresentments, often among information operations personnel whoare uncomfortable about having "another group of people lookingover their shoulders," the official said.
    http://www.drain365.co.uk/cialis-generico-brasil-comprar.pdf#services precio cialis sin receta For the week ended Sept. 27, 30-year mortgage rates fell to4.49 percent from 4.8 percent in the week ended Aug. 23, afterthe U.S. Federal Reserve opted not to curtail its bond-buyingprogram on Sept. 18, but there was little sign that Wells Fargowould immediately benefit.
    http://prime-mfg.com.au/cytotec-costo-en-farmacias-colombia.pdf misoprostol 200mg aborto ”Like any other industrial activity, oil and gas operations will normally require the agreement of the landowners whose land is used. Oil or gas developers will negotiate with landowners as necessary and agree terms for the access they require.”
    http://www.viajesdefindesemana.net/does-viagra-interact-with-alcohol.pdf#balmy generic viagra professional sildenafil 100mg In the laundry list of risk factors that's typicallyappended to all company IPO filings, Twitter warned it washeavily reliant on advertising revenue. It said more than 87percent of its revenue came from advertising in the first halfof 2013.

    Link do comentário Sábado, 23 Setembro 2017 00:04 postado por Terrell
  • Arnoldo

    Could you ask him to call me? https://www.ezlearning.co.uk/cardura-xl-doxazosinum.pdf#achievement cardura 1 mg cena A government shutdown would have wide-ranging implications for most assets. If a deal were reached quickly, markets might recover, but a prolonged shutdown could harm the economy and consumer confidence. While a deal could still be reached before the government's fiscal year ends at midnight on Monday, such a possibility was considered unlikely.
    https://www.woodendcreative.co.uk/celexa-cost-at-walmart.pdf#gravel escitalopram price costco “I’ve always had the physical tools,” Hill said before he caught one pass for 11 yards against the Jaguars on Saturday. “I just needed to make sure I understand what’s going on out there on the field and that’s definitely been a plus for me this year.”
    http://home-startwatford.org.uk/rogaine-discount-code-free-shipping.pdf rogaine hair treatment reviews Nicky Hawkins decided to get involved in the charity event because her eight-year-old son Freddie has type 1 diabetes – a lifelong condition that causes a person’s blood sugar level to become too high.
    https://www.websitedesignmarketing.com/buy-elimite-cream-over-the-counter.pdf scabies permethrin itch In addition to new generation and new power lines, otheroptions discussed included a subsea power cable to move power toSan Diego and expanding existing demand-response programs toallow the grid operator to better match the ups and downs ofgrowing solar and wind generation throughout the day.
    http://www.tattoolove.org/hoe-lang-duurt-de-werking-van-kamagra.pdf wie wirkt kamagra oral jelly bei frauen WASHINGTON, Sept 18 (Reuters) - Republicans in the House ofRepresentatives set in motion on Wednesday a plan thatultimately could avert a federal government shutdown on Oct. 1,turning a later battle over the debt ceiling into the main eventin the conservative struggle against President Barack Obama'shealthcare program.

    Link do comentário Sábado, 23 Setembro 2017 00:04 postado por Arnoldo

Deixe um comentário

Certifique-se de preencher os campos indicados com (*). Não é permitido código HTML.

Entre em contato conosco

Vamos falar sobre seu projeto! Clique em Contato e preencha o formulário que entraremos em contato o mais breve possível.

Contato