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سه شنبه, 08 ارديبهشت 1394 11:50

لوله های پلی اتیلن سخت PE100 مطلب ویژه

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این لوله ها از مواد با گرید PE100 از قطر 20 تا 450 میلیمتر و با فشارهای کاری از PN3.2 تا PN25 اتمسفر تولید می شوند.

کاربردها :

  • شبکه های آبرسانی
  • شبکه های فاضلاب
  • شبکه های آبیاری تحت فشار
  • سیستم های مایعات و فاضلاب صنعتی
  • پوشش کابل های مخابراتی
  • پوشش کابل های برق

مزیت ها و ویژگی ها :

  • مقاومت در برابر پوسیدگی و سایش و ضربه
  • مقاومت در برابر خوردگی گالوانیکی
  • وزن پایین
  • حمل آسان
  • قابلیت انعطاف پذیری بالا
  • مقاومت بالا در برابر اشعه فرابنفش خورشید
خواندن 4179206 دفعه آخرین ویرایش در یکشنبه, 05 ارديبهشت 1395 05:38

314503 نظرها

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    By David Alire Garcia

    MEXICO CITY, Nov 20 (Reuters) - Mexico's axolotl salamander can almost magically heal itself, holding the power to regrow its
    heart and brain. But there is one feat it may not pull off:
    survive dire threats to the last wild place it calls home.


    Plagued by polluted water, predatory fish and the steady encroachment of one of the world's biggest megacities, the tiny amphibian steeped in mythological lore has all
    but disappeared from its home in the muddy canals of southern Mexico City.


    Once a mainstay on the banquet tables of Aztec kings, in 1998 there were about 6,000 axolotls per square kilometer in the salamander's main redoubt, the waterways of the city's Xochimilco district, a scientific census
    showed.

    By 2004, the population had dropped to 1,000 per
    sq/km, and to less than 35 per sq/km a decade later.

    By 2020, there may be none, according to one model.

    Undeterred, a group of Mexican biologists have launched a rescue mission.

    "Without the axolotl, Mexico would lose part of its culture and identity," said Luis Zambrano,
    an urban biologist at Mexico's National Autonomous University (UNAM), who leads
    the team behind the plan.

    He argues that farmers in Xochimilco known as chinamperos, who grow a wide range of produce along some 180 kilometers of canals, are crucial players in the effort to build new sanctuaries for axolotl
    (pronounced ah-sho-LO-tul) while promoting traditional chinampa agriculture.


    Chinampas are floating gardens made from dredged-up black mud slathered on reeds and tree branches once used to produce as
    many as seven harvests a year for staples like corn and chili peppers.


    They flourished for over a thousand years in the lake that once filled the Valley of Mexico, where the Aztec imperial capital and later Mexico City
    would arise.

    Today, around 80 percent of the remaining chinampas have been abandoned as
    farmers seek better wages elsewhere.

    Over the next decade, Zambrano aims to enroll about half of Xochimilco's chinamperos into an axolotl-friendly organic certification scheme that would
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    The university-run certification aims to launch in 2019.


    With a modest budget, his team is creating 20 new sanctuaries with
    cleaner water using filters that also keep out the non-native tilapia and carp stalking the canals.


    GENETIC ROCK STAR

    Modern research into the axolotl began in 1864, after a shipment of 34 arrived in Paris from
    Mexico. Thousands more were then bred as scientists across Europe
    marveled at their strange appearance and ability to breathe with
    both lungs and gills.

    Researchers later discovered that axolotls can also absorb oxygen through their
    skin - making them particularly vulnerable to dirty water - and regenerate amputated limbs
    and damaged body tissue, creating intense interest in their genes.


    Earlier this year, a team of scientists in Germany said they had mapped the complete axolotl genome, revealing it to be 10 times longer than the human genome, which gives researchers
    more scope to pinpoint the mechanisms for regeneration.

    "You can actually take a primordial piece of the tissue that's going to form its eye and transplant it into the space around the gut and the axolotl will regenerate and form a whole eye there," said Randal Voss, a University of Kentucky scientist and
    director of the world's largest axolotl laboratory.


    But whether they have a future outside the laboratory will largely depend on whether Xochimilco's booming tilapia and carp populations can be controlled.


    The fish were introduced in the 1970s by the government as part of a nutrition program.
    But their taste for axolotl eggs and juveniles was not considered.


    Industrial-scale fishing earlier this year removed tonnes of them from Xochimilco.

    But the effort has run out of funding.

    Claudia Sheinbaum, set to take over as Mexico City's next mayor in December and herself a scientist, said in a recent interview that she wants the capital's water infrastructure overhauled, and
    the raw sewage that pollutes the Xochimilco canals when heavy rains overwhelm
    the aging pipes to be contained.

    POP CULTURE APPEAL

    Its future hanging in the balance, the axolotl has for years played an outsized cultural role in Mexico and beyond.


    In Aztec legend, the desperate rebel god Xolotl
    transformed himself into an axolotl to hide and avoid his own sacrifice at the hands of his
    fellow gods. He was still discovered, captured
    and killed.

    Axolotls have appeared in Diego Rivera's murals and Pokemon video games.
    They even helped inspire the look of the main character
    Toothless in DreamWorks Animation's hit "How to Train Your Dragon" movies.


    "There's definitely a cuteness that comes through. The way it stands, the way its eyes are, the shape of its mouth," said Simon Otto,
    head of character animation for the films.

    The third installment of the series due out in March draws heavily on rare albino axolotls for a new character, he said.



    A few pinkish-white amphibians wiggle around in aquariums
    at Horacio Mena's axolotl laboratory on the UNAM campus.

    But most are grey or black, better suited to avoid predators.



    Some move toward the edge of the glass and even appear to make eye contact with approaching visitors.


    Mena explained how the new sanctuaries will be stocked over
    the coming months to give the species a
    new foothold.

    "My dream is to see them live freely," he said, "and return to this mythical part of Mexico that is Xochimilco." (Reporting by David
    Alire Garcia in Mexico City Additional reporting by Frank Jack Daniel and Diego Ore in Mexico City
    Editing by Dave Graham and Matthew Lewis)

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