Libro de Visitas

Wileychoon

20 Apr 2025 - 12:32 am

‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

“One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
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If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

“Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

Michaelcow

19 Apr 2025 - 11:54 pm

Тяговые батареи для техники

Что такое тяговые аккумуляторы

Тяговые батареи это аккумуляторные батареи, предназначенные для накопления и отдачи великого объёма энергии в течение долгого времени. Их главное назначение обеспечение питания электрических транспортных средств и специализированной техники, например:

- Электропогрузчики
- Электрокары
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- Гольфкары

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

Основные типы тяговых аккумуляторов

* Кислотные (сурьмянистые, малосурьмянистые)
Классическая технология, проверенная годами. Отличаются невысокой стоимостью, но требуют постоянного 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 технического обслуживания, длинный срок службы. Минус высокая цена.

Преимущества использования тяговых аккумуляторов

- Возможность неоднократного циклирования заряда и разряда
- Высокая отдача энергии при условно малых габаритах
- Долговечность при правильной эксплуатации
- Безопасность (в особенности у герметизированных вариантов)
- Уменьшение расходов на топливо и обслуживание техники

На что направить внимание в момент выбора

1. Ёмкость аккума (Ач) подбирается с запасом, как следует из употребления техники.
2. Тип аккума наличие требований к обслуживанию, безопасность, рабочие условия.
3. Напряжение батареи должно соответствовать требованиям техники.
4. Размеры и форма соответствие батарейного отсека.
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- Соблюдайте аннотации по заряду и уровню.
- Не допускайте глубочайших разрядов (особенно для свинцово-кислотных моделей).
- Для обслуживаемых АКБ регулярно инспектируйте уровень электролита.
- Используйте только рекомендованные производителем зарядные устройства.
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Вывод

Правильно подобранные и эксплуатируемые тяговые аккумуляторы обеспечат бесперебойную работу вашей техники, минимизируют издержки на сервис и эксплуатацию, но также продлят срок службы оборудования. Большой выбор современных аккумов дает возможность подобрать решение под любые задачки и бюджет.

Stephenabelo

19 Apr 2025 - 11:50 pm

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Tommieicota

19 Apr 2025 - 11:28 pm

‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

“One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
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If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

“Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

Harryrathe

19 Apr 2025 - 10:15 pm

Broken spheres
Dyson died in 2020 before any of his spheres could be found — although they are just one of a dozen ideas that bear his name.
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“As a young scientist, Dyson showed that three competing quantum theories were actually the same theory — he summarily ended the competition,” said William Press, the Leslie Surginer Professor of Computer Science and Integrative Biology at the University of Texas at Austin. He was not involved in the study. “Later, he applied his genius to areas of astronomy, cosmology, the extraterrestrial realm, and also the very real problem of nuclear proliferation here on planet Earth. At the time of his death, he was recognized as a provocative and creative thinker.”

George Dyson also attested to his father’s fascination and comprehensive reach across disciplines.
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“Taking advantage of a short attention span and an aversion to bureaucracy, he contributed to five fields of mathematics and eleven fields of physics, as well as to theoretical biology, engineering, operations research, literature, and public affairs,” the younger Dyson said. “Many of his ideas were controversial, with one of his guiding principles being that ‘It is better to be wrong than to be vague.’”

The approach of the researchers behind the new study could offer a more fruitful path in the search for extraterrestrial intelligence, said Tomotsugu Goto, an associate professor of astronomy at the National Tsing Hua University in Taiwan. He also was not involved with the study.

“However, contamination by circumstellar debris disks, which mimic Dyson Sphere infrared signatures, remains a concern,” he added in an email. “Authors argue that the debris disks around (dwarf stars) are rare, but the 7 candidate authors selected out of 5 million sources are also rare. Despite this, the seven candidates warrant further investigation with powerful telescopes for a more definitive evaluation.”

Frankidelt

19 Apr 2025 - 09:36 pm

‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

“One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
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If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

“Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

Davidenviz

19 Apr 2025 - 09:29 pm

Trailer trucks queue to cross into the United States at the Otay Mesa Port of Entry, in Tijuana, Mexico, November 27, 2024. Jorge Duenes/Reuters
New York
CNN
—
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Since President Donald Trump won the election in November, businesses across the globe have been bracing for higher tariffs — a key Day One promise the president made.

But over a week into his presidency, Trump has yet to enact any new tariffs.
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That could change, come 11:59 p.m. ET on Saturday — the deadline Trump set for when he says he will slap 25% tariffs on all Mexican and Canadian goods and a 10% tariff on all Chinese goods.

The tariffs, he said, will be imposed as a way of punishing the three nations, which Trump claims are responsible for helping people enter the country illegally and supplying fentanyl consumed in the US.

Speaking to reporters from the Oval Office on Thursday, Trump said he meant business, especially with his tariff threats on Mexico and Canada. White House Press Secretary Karoline Leavitt also confirmed on Friday that Trump will levy the 10% tariff on China on Saturday.
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Should these threats be believed? Yes and no, said Trump’s former Commerce Secretary Wilbur Ross.
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The threat of blanket tariffs is likely being overstated, Ross said in an interview with CNN. “There probably will be exclusions, because there are some goods that just are not made here, will not be made here, and therefore, there’s no particular point putting tariffs on.”

Ross, who was one of a handful of initial cabinet members in Trump’s first administration who kept their position for the entire four-year term, said he advocated for such exclusions when he advised Trump on tariff policies.



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Michaelcow

19 Apr 2025 - 09:07 pm

Тяговые батареи для техники

Что такое тяговые аккумуляторы

Тяговые батареи 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 отличие от стартерных аккумуляторов, тяговые батареи рассчитаны на глубочайший разряд и неоднократные циклы зарядразряд.

Основные типы тяговых аккумуляторов

* Кислотные (сурьмянистые, малосурьмянистые)
Традиционная разработка, проверенная годами. Отличаются невысокой ценою, но требуют постоянного 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, быстрое время заряда, не требуют технического обслуживания, долгий срок службы. Минус высокая цена.

Преимущества использования тяговых аккумов

- Возможность неоднократного циклирования заряда и разряда
- Высочайшая отдача энергии при условно малых габаритах
- Долговечность при правильной эксплуатации
- Безопасность (в особенности у герметизированных вариантов)
- Уменьшение расходов на горючее и обслуживание техники

На что обратить внимание при выборе

1. Ёмкость аккумулятора (Ач) подбирается на вырост, исходя из употребления техники.
2. Тип аккума наличие требований к обслуживанию, безопасность, рабочие условия.
3. Напряжение батареи должно соответствовать требованиям техники.
4. Размеры и форма соответствие батарейного отсека.
5. Репутация производителя от этого зависит качество и ресурс батареи [url=http://rodina.listbb.ru/viewtopic.php?f=2&t=2634]http://rodina.listbb.ru/viewtopic.php?f=2&t=2634[/url]

Эксплуатация и сервис

- Соблюдайте практические руководства по заряду и уровню.
- Не допускайте 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

Правильно подобранные и эксплуатируемые тяговые аккумуляторы обеспечат бесперебойную работу вашей техники, минимизируют издержки на обслуживание и эксплуатацию, также продлят срок службы оборудования. Великий выбор современных аккумов дает возможность подобрать решение под любые задачки и бюджет.

Larrydandy

19 Apr 2025 - 09:07 pm

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.

Follow live politics coverage here
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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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Larrycooth

19 Apr 2025 - 08:31 pm

‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

“One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
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If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

“Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”