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چهارشنبه, 20 اسفند 1393 07:37

لوله های پلی اتیلن نرم ( LDPE ) مطلب ویژه

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این لوله ها از پلیمرهای با دانسیته پایین، گرید PE32 و PE40 با خط تولید مخصوص لوله های LDPدر قطرهای 16 تا 32 میلیمتر و فشار کاری 2.5 تا 6 اتمسفرتولید می شوند.

مزیت، ویژگی و کاربردها :

مزیت این لوله ها حالت نرم بودن و انعطاف پذیری بالای آنها می باشد و کاربرد آنها در آبیاری قطره ای است
خواندن 5330911 دفعه آخرین ویرایش در سه شنبه, 28 ارديبهشت 1395 11:42

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  • پیوند نظر MontySpumn جمعه, 28 تیر 1404 03:30 ارسال شده توسط MontySpumn

    That insight is part of the value of having kids play with dolls that have disabilities, said Dr. Sian Jones, co-founder of the Toy Box Diversity Lab at Queen Margaret University in Edinburgh, Scotland.
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    Jones and her colleague Dr. Clare Uytman study how playing with dolls and toys with a range of physical challenges can reduce systemic inequality for disabled people.
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    It’s based on a theory of mirrors and windows by Rudine Sims Bishop, a professor emerita of education at Ohio State University. Bishop realized that having diverse characters in books was good for all kids: It helps children from minority groups see themselves mirrored in the lives of book characters, and it gives kids a window into the lives of others, helping them build empathy.

    Jones says that when kids play with dolls that have mobility challenges, for example, it helps them identify and understand the struggles of people with disabilities whom they meet in real life.
    “Barbie in a wheelchair cannot use the doll’s house in their kindergarten classroom, so they have to build a ramp in order for her to be able to access the door to their doll’s house, for example,” said Jones, who lives with cerebral palsy.

    When she started her work incorporating disabled dolls into school curricula, Jones said, there were few available for purchase. She mostly had to make them herself. Now, she can buy them from big companies like Lego and Mattel, “which is wonderful.”
    Mazreku says the work to design the doll was well worth it. She recently got to bring one home to give to her 3-year-old daughter.

    “I brought Barbie home to her and gave her a chance to interact with her and see her things,” Mazreku said. “And she looked at me and she said, ‘She looks like Mommy.’ And that was so special for me.”

    Her daughter doesn’t have type 1 diabetes, she said. “But she sees me every day, living with it, representing and understanding and showing the world and wearing my devices confidently, and for her to see Barbie doing that was really special.”

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    Extreme heat is a killer. A recent heat wave shows how much more deadly it’s becoming
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    Extreme heat is a killer and its impact is becoming far, far deadlier as the human-caused climate crisis supercharges temperatures, according to a new study, which estimates global warming tripled the number of deaths in the recent European heat wave.

    For more than a week, temperatures in many parts of Europe spiked above 100 degrees Fahrenheit. Tourist attractions closed, wildfires ripped through several countries, and people struggled to cope on a continent where air conditioning is rare.
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    The outcome was deadly. Thousands of people are estimated to have lost their lives, according to a first-of-its-kind rapid analysis study published Wednesday.

    A team of researchers, led by Imperial College London and the London School of Hygiene and Tropical Medicine, looked at 10 days of extreme heat between June 23 and July 2 across 12 European cities, including London, Paris, Athens, Madrid and Rome.

    They used historical weather data to calculate how intense the heat would have been if humans had not burned fossil fuels and warmed the world by 1.3 degrees Celsius. They found climate change made Europe’s heat wave 1 to 4 degrees Celsius (1.8 to 7.2 Fahrenheit) hotter.

    The scientists then used research on the relationship between heat and daily deaths to estimate how many people lost their lives.

    They found approximately 2,300 people died during ten days of heat across the 12 cities, around 1,500 more than would have died in a world without climate change. In other words, global heating was responsible for 65% of the total death toll.

    “The results show how relatively small increases in the hottest temperatures can trigger huge surges in death,” the study authors wrote.

    Heat has a particularly pernicious impact on people with underlying health conditions, such as heart disease, diabetes and respiratory problems.

    People over 65 years old were most affected, accounting for 88% of the excess deaths, according to the analysis. But heat can be deadly for anyone. Nearly 200 of the estimated deaths across the 12 cities were among those aged 20 to 65.

    Climate change was responsible for the vast majority of heat deaths in some cities. In Madrid, it accounted for about 90% of estimated heat wave deaths, the analysis found.

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  • پیوند نظر Thomastrego جمعه, 28 تیر 1404 03:28 ارسال شده توسط Thomastrego

    Job losses
    But what about the impact of tariffs on job creation? Surprisingly, an increase in import taxes has been found to result in slightly more unemployment across countries.
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    An example provided by Irwin at Dartmouth College points to one plausible explanation — and it has to do with the steeper cost of imported goods.

    “A number of studies have shown, on net, we lost jobs from the (2018) steel tariffs rather than gained jobs because there are more people employed in the downstream user industries than in the steel industry itself,” he said.
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    A study by the Federal Reserve Board found that a rise in input costs resulting from US tariff hikes in 2018-19 led to job losses in American manufacturing. The damage from those higher expenses was compounded by retaliatory taxes on US exports, more than offsetting a small boost to manufacturing employment from US tariffs — at least so far, the 2024 paper said.

    Retaliation by other countries is indeed another danger of pulling the tariff lever. Higher tariffs on American exports would typically raise their prices for foreign consumers, hitting demand for the goods in many cases.

    When Trump announced new tariffs this year, America’s major trading partners were quick to strike back with their own levies, although the US then agreed a temporary truce with China and the European Union.

    Costs of free trade
    While economists generally agree that free trade has benefited the global economy in recent decades, they acknowledge that it comes with certain costs.

    One is the loss of jobs in communities that are particularly exposed to new competition from foreign manufacturers.

    That is similar to the impact of technological progress on workers. “Manufacturing jobs as a share of the labor force have come down everywhere. It isn’t a US-specific story,” said Gimber at JPMorgan Asset Management, pointing to automation.

    He drew a parallel between helping workers affected by higher imports and what is known as a just transition — the idea that the drastic changes needed to move toward a greener economy should be fair to everyone and minimize harm to workers and communities.

    In both cases, providing workers in impacted industries with new skills or retraining them could be key, Gimber said.

    Another potential cost of free trade is dependency on far-flung manufacturers. That took on new relevance during the pandemic, which snarled global supply chains, contributing to shortages of products such as face masks and respirators in the US and elsewhere.

    However, economists do not typically see tariffs as a good way to build up domestic manufacturing, Fatas at INSEAD said, noting that subsidies for specific industries are viewed as a better tool “because they work more directly.”

    But perhaps the strongest argument in favor of free trade is its importance to maintaining peace between nations.

    As Gimber’s colleague David Kelly noted in March, closer trade relations give countries more to lose in any conflict.

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