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Alonzosperi

18 Apr 2025 - 03:06 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.”)

Robertfax

18 Apr 2025 - 02:37 pm

Что учесть при выборе подходящих пиломатериалов для строительства

Введение
Пиломатериалы это база хоть какого строительства: от каркасного дома до беседки либо террасы. Грамотный выбор древесины оказывает влияние на прочность, долговечность и эстетику будущей постройки. В этой статье расскажем, на что стоит направить внимание при выборе пиломатериалов для строительства.

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

Хвойные (сосна, ель, лиственница)
Самые знаменитые и доступные из-за цене и неплохим строительным характеристикам. Лиственница более устойчива к влаге, чем сосна.

Лиственные (дуб, ясень, берёза)
Используются пореже из-за высокой цены. Владеют повышенной прочностью и износостойкостью, образцовы для внутренних работ и отделки [url=https://tokaido-nsk.com/forum/index.php?PAGE_NAME=profile_view&UID=15082]https://tokaido-nsk.com/forum/index.php?PAGE_NAME=profile_view&UID=15082[/url]

Сорт и качество
Пиломатериалы бывают разных сортов (в течении 4).
Первый сорт минимальное количество сучков и изъянов, подходит для ответственных конструкций.
Второй и 3-ий сорт возможны отдельные недостатки, используют для предварительных работ.
Четвертый сорт только для временных и второстепенных конструкций.

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

Строительная влажность (1822%)
Подходит 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, неимение трещин и сколов. Особое внимание уделяйте одинаковой толщине материала особенно для несущих конструкций.

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

Для внешних работ
Подходят пиломатериалы с природной устойчивостью (лиственница) или тщательно обработанные составами для высокой защиты от воды.

Для внутренних работ
Можно использовать более мягкие и дешёвые породы, но с неплохой влажностью и без очевидных дефектов.

Где покупать
Выбирайте проверенных поставщиков. Не стыдитесь просить сертификаты о происхождении и влажности. Рассматривайте пиломатериалы на складе прежде чем купить.

Заключение
В момент выбора пиломатериалов важно учитывать породу дерева, сортность, влажность, обработку и предназначение материалов. Правильный практикует выбору гарантирует долговечность и надёжность вашей постройки, а также сбережет ваше время и деньги на ремонте в дальнейшем.

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18 Apr 2025 - 01:55 pm

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Brandonmat

18 Apr 2025 - 01:47 pm

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.”

Bernardglymn

18 Apr 2025 - 11:58 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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Larrydam

18 Apr 2025 - 11:47 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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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.

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