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Allandab

19 Apr 2025 - 02:52 pm

Why axolotls seem to be everywhere — except in the one lake they call home
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Scientist Dr. Randal Voss gets the occasional reminder that he’s working with a kind of superstar. When he does outreach events with his laboratory, he encounters people who are keen to meet his research subjects: aquatic salamanders called axolotls.

The amphibians’ fans tell Voss that they know the animals from the internet, or from caricatures or stuffed animals, exclaiming, “‘They’re so adorable, we love them,’” said Voss, a professor of neuroscience at the University of Kentucky College of Medicine. “People are drawn to them.”

Take one look at an axolotl, and it’s easy to see why it’s so popular. With their wide eyes, upturned mouths and pastel pink coloring, axolotls look cheerful and vaguely Muppet-like.

They’ve skyrocketed in pop culture fame, in part thanks to the addition of axolotls to the video game Minecraft in 2021. These unusual salamanders are now found everywhere from Girl Scout patches to hot water bottles. But there’s more to axolotls than meets the eye: Their story is one of scientific discovery, exploitation of the natural world, and the work to rebuild humans’ connection with nature.

A scientific mystery
Axolotl is a word from Nahuatl, the Indigenous Mexican language spoken by the Aztecs and an estimated 1.5 million people today. The animals are named for the Aztec god Xolotl, who was said to transform into a salamander. The original Nahuatl pronunciation is “AH-show-LOAT”; in English, “ACK-suh-LAHT-uhl” is commonly used.
Axolotls are members of a class of animals called amphibians, which also includes frogs. Amphibians lay their jelly-like eggs in water, and the eggs hatch into water-dwelling larval states. (In frogs, these larvae are called tadpoles.)

Most amphibians, once they reach adulthood, are able to move to land. Since they breathe, in part, by absorbing oxygen through their moist skin, they tend to stay near water.

Axolotls, however, never complete the metamorphosis to a land-dwelling adult form and spend their whole lives in the water.

“They maintain their juvenile look throughout the course of their life,” Voss said. “They’re teenagers, at least in appearance, until they die.”

Michaelpek

19 Apr 2025 - 02:42 pm

Тяговые аккумуляторы для техники

Что такое тяговые батареи

Тяговые аккумуляторы это аккумуляторные батареи, предназначенные для скопления и отдачи большого объёма энергии в течение долгого времени. Их главное назначение обеспечение питания электрических транспортных средств и спец техники, например:

- Электропогрузчики
- Электрокары
- Электроштабелёры
- Поломоечные, уборочные машины
- Гольфкары

В небольшом отличии от стартерных аккумуляторов, тяговые батареи рассчитаны на глубокий разряд и многократные циклы зарядразряд.

Основные типы тяговых аккумов

* Кислотные (сурьмянистые, малосурьмянистые)
Традиционная разработка, проверенная годами. Отличаются низкой стоимостью, но требуют регулярного обслуживания.

* AGM и GEL
Модификации свинцово-кислотных аккумуляторов, где электролит находится в абсорбированной (AGM) или гелеобразной форме (GEL). Таки батареи не требуют обслуживания и безопаснее в эксплуатации.

* Литий-ионные
Современный вариант тяговых аккумов выше энергоёмкость, малый вес, прыткое время заряда, не требуют техобслуживания, долгий срок эксплуатации. Минус высокая стоимость.

Преимущества использования тяговых аккумуляторов

- Возможность многократного циклирования заряда и разряда
- Высочайшая отдача энергии при относительно малых габаритах
- Долговечность при правильной эксплуатации
- Безопасность (необыкновенно у герметизированных вариантов)
- Убавленье расходов на горючее и обслуживание техники

На что направить внимание при выборе

1. Ёмкость аккумулятора (Ач) подбирается с запасом, как следует из употребления техники.
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4. Размеры и форма соответствие батарейного отсека.
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Эксплуатация и сервис

- Соблюдайте аннотации по заряду и разряду.
- Не дозволяйте глубоких разрядов (особенно для свинцово-кислотных моделей).
- Для обслуживаемых АКБ регулярно проверяйте уровень электролита.
- Используйте только рекомендованные производителем зарядные устройства.
- Соблюдайте температурный режим хранения и использования.

Вывод

Верно подобранные и эксплуатируемые тяговые аккумуляторы обеспечат бесперебойную работу вашей техники, минимизируют затраты на обслуживание и эксплуатацию, а также продлят срок эксплуатации оборудования. Большой выбор современных аккумов дозволяет подобрать решение под любые задачи и бюджет.

Frankknory

19 Apr 2025 - 01:28 pm

Lunar clockwork
What scientists know for certain is that they need to get precision timekeeping instruments to the moon.
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Exactly who pays for lunar clocks, which type of clocks will go, and where they’ll be positioned are all questions that remain up in the air, Gramling said.

“We have to work all of this out,” she said. “I don’t think we know yet. I think it will be an amalgamation of several different things.”
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Atomic clocks, Gramling noted, are great for long-term stability, and crystal oscillators have an advantage for short-term stability.
“You never trust one clock,” Gramling added. “And you never trust two clocks.”

Clocks of various types could be placed inside satellites that orbit the moon or perhaps at the precise locations on the lunar surface that astronauts will one day visit.

As for price, an atomic clock worthy of space travel could cost around a few million dollars, according Gramling, with crystal oscillators coming in substantially cheaper.

But, Patla said, you get what you pay for.

“The very cheap oscillators may be off by milliseconds or even 10s of milliseconds,” he added. “And that is important because for navigation purposes — we need to have the clocks synchronized to 10s of nanoseconds.”

A network of clocks on the moon could work in concert to inform the new lunar time scale, just as atomic clocks do for UTC on Earth.

(There will not, Gramling added, be different time zones on the moon. “There have been conversations about creating different zones, with the answer: ‘No,’” she said. “But that could change in the future.”)

Gordoncex

19 Apr 2025 - 10:15 am

‘A whole different mindset’
Accurate clockwork is one matter. But how future astronauts living and working on the lunar surface will experience time is a different question entirely.
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On Earth, our sense of one day is governed by the fact that the planet completes one rotation every 24 hours, giving most locations a consistent cycle of daylight and darkened nights. On the moon, however, the equator receives roughly 14 days of sunlight followed by 14 days of darkness.

“It’s just a very, very different concept” on the moon, Betts said. “And (NASA is) talking about landing astronauts in the very interesting south polar region (of the moon), where you have permanently lit and permanently shadowed areas. So, that’s a whole other set of confusion.”
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“It’ll be challenging” for those astronauts, Betts added. “It’s so different than Earth, and it’s just a whole different mindset.”

That will be true no matter what time is displayed on the astronauts’ watches.

Still, precision timekeeping matters — not just for the sake of scientifically understanding the passage of time on the moon but also for setting up all the infrastructure necessary to carry out missions.

The beauty of creating a time scale from scratch, Gramling said, is that scientists can take everything they have learned about timekeeping on Earth and apply it to a new system on the moon.

And if scientists can get it right on the moon, she added, they can get it right later down the road if NASA fulfills its goal of sending astronauts deeper into the solar system.

“We are very much looking at executing this on the moon, learning what we can learn,” Gramling said, “so that we are prepared to do the same thing on Mars or other future bodies.”

Virgilapova

19 Apr 2025 - 08:06 am

Space, time: The continual question
If time moves differently on the peaks of mountains than the shores of the ocean, you can imagine that things get even more bizarre the farther away from Earth you travel.
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To add more complication: Time also passes slower the faster a person or spacecraft is moving, according to Einstein’s theory of special relativity.

Astronauts on the International Space Station, for example, are lucky, said Dr. Bijunath Patla, a theoretical physicist with the US National Institute of Standards and Technology, in a phone interview. Though the space station orbits about 200 miles (322 kilometers) above Earth’s surface, it also travels at high speeds — looping the planet 16 times per day — so the effects of relativity somewhat cancel each other out, Patla said. For that reason, astronauts on the orbiting laboratory can easily use Earth time to stay on schedule.
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For other missions — it’s not so simple.

Fortunately, scientists already have decades of experience contending with the complexities.

Spacecraft, for example, are equipped with their own clocks called oscillators, Gramling said.

“They maintain their own time,” Gramling said. “And most of our operations for spacecraft — even spacecraft that are all the way out at Pluto, or the Kuiper Belt, like New Horizons — (rely on) ground stations that are back on Earth. So everything they’re doing has to correlate with UTC.”
But those spacecraft also rely on their own kept time, Gramling said. Vehicles exploring deep into the solar system, for example, have to know — based on their own time scale — when they are approaching a planet in case the spacecraft needs to use that planetary body for navigational purposes, she added.

For 50 years, scientists have also been able to observe atomic clocks that are tucked aboard GPS satellites, which orbit Earth about 12,550 miles (20,200 kilometers) away — or about one-nineteenth the distance between our planet and the moon.

Studying those clocks has given scientists a great starting point to begin extrapolating further as they set out to establish a new time scale for the moon, Patla said.

“We can easily compare (GPS) clocks to clocks on the ground,” Patla said, adding that scientists have found a way to gently slow GPS clocks down, making them tick more in-line with Earth-bound clocks. “Obviously, it’s not as easy as it sounds, but it’s easier than making a mess.”

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19 Apr 2025 - 05:30 am

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Robertastex

19 Apr 2025 - 04:27 am

Что учитывать при выборе подходящих пиломатериалов для строительства

Введение
Пиломатериалы это база хоть какого строительства: от каркасного дома до беседки или террасы. Грамотный выбор древесной породы влияет на крепкость, долговечность и эстетику будущей постройки. В данном посте поведаем, на что стоит направить внимание при выборе пиломатериалов для строительства.

Вид древесной породы
Разные породы дерева имеют свои достоинства и недочеты.

Хвойные (сосна, ель, лиственница)
Самые известные и доступные благодаря цене и превосходным строительным характеристикам. Лиственница более устойчива к влаге, чем сосна.

Лиственные (дуб, ясень, берёза)
Используются пореже из-за высокой цены. Обладают завышенной прочностью и износостойкостью, безупречны для внутренних работ и отделки [url=https://notebooks.ru/forum/user/146895/]https://notebooks.ru/forum/user/146895/[/url]

Сорт и качество
Пиломатериалы посещают различных сортов (в течении 4).
1-ый сорт малое количество сучков и недостатков, подходит для ответственных конструкций.
Второй и 3-ий сорт возможны отдельные дефекты, используют для черновых работ.
Четвертый сорт только для временных и второстепенных конструкций.

Влажность древесной породы
Влажность древесной породы влияет на её геометрию и срок службы. Слишком сырая древесина может деформироваться при высыхании.

Строительная влажность (1822%)
То что надо для предварительного строительства.

Камерная сушка (1214%)
Используется для внутренней отделки и мебели.

Обработка и защита
Обрешечённые, строганые, профилированные пиломатериалы теснее готовы к использованию. Необработанную древесную породу рекомендуется пропитывать антисептиками, антипиренами (защита от гниения, плесени, насекомых и огня).

Размеры и геометрия
Проверьте правильность размеров, прямолинейность, отсутствие трещинок и сколов. Особенное внимание уделяйте одинаковой толщине материала в особенности для несущих конструкций.

Предназначение
Для каркасных стенок, балок, перекрытий
Используйте брус и дощечку высших сортов, хорошо просушенные и обработанные.

Для наружных работ
Подходят пиломатериалы с естественной устойчивостью (лиственница) или кропотливо обработанные составами для высокой защиты от влаги.

Для внутренних работ
Применяют более мягенькие и дешёвые породы, но с превосходной влажностью и без явных изъянов.

Где покупать
Выбирайте испытанных поставщиков. Не смущяйтесь просить сертификаты о происхождении и влажности. Оглядывайте пиломатериалы на складе перед покупкой.

Заключение
В момент выбора пиломатериалов главно учитывать породу дерева, сортность, влажность, обработку и назначение материалов. Правильный подход к выбору гарантирует долговечность и надёжность вашей постройки, а также сэкономит ваше время и деньги на ремонте в дальнейшем.

Larryviell

19 Apr 2025 - 04:07 am

WASHINGTON — “Liberation Day” just gave way to Capitulation Day.
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President Donald Trump pulled back Wednesday on a series of harsh tariffs targeting friends and foes alike in an audacious bid to remake the global economic order.

Trump's early afternoon announcement followed a harrowing week in which Republican lawmakers and confidants privately warned him that the tariffs could wreck the economy. His own aides had quietly raised alarms about the financial markets before he suspended a tariff regime that he had unveiled with a flourish just one week earlier in a Rose Garden ceremony.

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The stock market rose immediately after the about-face, ending days of losses that have forced older Americans who've been sinking their savings into 401(k)s to rethink their retirement plans.

Ahead of Trump's announcement, some of his advisers had been in a near panic about the bond markets, according to a senior administration official. Interest rates on 10-year Treasury bonds had been rising, contrary to what normally happens when stock prices fall and investors seek safety in treasuries. The unusual dynamic meant that at the same time the tariffs could push up prices, people would be paying more to buy homes or pay off credit card debt because of higher interest rates. Businesses looking to expand would pay more for new loans.
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Two of Trump's most senior advisers, Treasury Secretary Scott Bessent and Commerce Secretary Howard Lutnick, presented a united front Wednesday, urging him to suspend the tariffs in light of the bond market, the administration official said.

In a social media post, Trump announced a 90-day pause that he said he’ll use to negotiate deals with dozens of countries that have expressed openness to revising trade terms that he contends exploit American businesses and workers. One exception is China. Trump upped the tariff on the country’s biggest geopolitical rival to 125%, part of a tit-for-tat escalation in an evolving trade war.

Trump reversed course one week after he appeared in the Rose Garden and unveiled his plan to bring jobs back to the United States. Displaying a chart showing the new, elevated tariffs that countries would face, Trump proclaimed, “My fellow Americans, this is Liberation Day.”
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Bernardwrolo

19 Apr 2025 - 12:50 am

President Donald Trump wants to bring back American manufacturing in ways that would reshape the United States economy to look more like China’s. The campaign, which has led to a rapidly escalating trade war with China, has given ample social media fodder to Chinese and American observers alike.
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Announcing a series of sweeping tariffs in a move dubbed “Liberation Day,” Trump said last week that it will lead factories to move production back to American shores, boosting the U.S. economy after “foreign leaders have stolen our jobs, foreign cheaters have ransacked our factories, and foreign scavengers have torn apart our once beautiful American dream.”
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In a Truth Social post Wednesday, Trump announced that he is raising tariffs on goods imported from China to 125%, up from the 104% that took effect the same day, due to “the lack of respect that China has shown to the World’s Markets.” Higher targeted tariffs on other countries have been paused for 90 days, although the 10% baseline tariff will remain in place for all countries.
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Meme-makers and Chinese government officials have in recent days begun pointing out the irony of Trump’s tariff-driven manufacturing pivot through AI-generated satire and political cartoons that have percolated online, with many American users boosting the jokes.
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