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Johnnieskalo

20 Apr 2025 - 12:56 am

Curiosity rover makes ‘arguably the most exciting organic detection to date on Mars’
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The NASA Curiosity rover has detected the largest organic molecules found to date on Mars, opening a window into the red planet’s past. The newly detected compounds suggest complex organic chemistry may have occurred in the planet’s past — the kind necessary for the origin of life, according to new research.

The organic compounds, which include decane, undecane and dodecane, came to light after the rover analyzed a pulverized 3.7 billion-year-old rock sample using its onboard mini lab called SAM, short for Sample Analysis at Mars.

Scientists believe the long chains of molecules could be fragments of fatty acids, which are organic molecules that are chemical building blocks of life on Earth and help form cell membranes. But such compounds can also be formed without the presence of life, created when water interacts with minerals in hydrothermal vents.

The molecules cannot currently be confirmed as evidence of past life on the red planet, but they add to the growing list of compounds that robotic explorers have discovered on Mars in recent years. A study detailing the findings was published Monday in the journal Proceedings of the National Academy of Sciences.
The detection of the fragile molecules also encourages astrobiologists that if any biosignatures, or past signs of life, ever existed on Mars, they are likely still detectable despite the harsh solar radiation that has bombarded the planet for tens of millions of years.

“Ancient life, if it happened on Mars, it would have released some complex and fragile molecules,” said lead study author Dr. Caroline Freissinet, research scientist at the French National Centre for Scientific Research in the Laboratory for Atmospheres, Observations, and Space in Guyancourt, France. “And because now we know that Mars can preserve these complex and fragile molecules, it means that we could detect ancient life on Mars.”

Josephmub

20 Apr 2025 - 12:54 am

Greenland’s leader says US officials’ visit is ‘highly aggressive.’ Trump says it’s ‘friendliness, not provocation’
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Greenland’s prime minister said a planned visit to the island by US officials, including second lady Usha Vance, is “highly aggressive,” plunging relations to a new low after President Donald Trump vowed to annex the autonomous Danish territory.

But despite the backlash, Trump has insisted the visit is about “friendliness, not provocation” – and claims the US team was “invited.”

Vance, the wife of US Vice President JD Vance, will travel to Greenland this week to watch the island’s national dogsled race and “celebrate Greenlandic culture and unity,” according to a statement from the White House. National security adviser Mike Waltz is also expected to visit the territory this week, according to a source familiar with the trip.

Greenland Prime Minister Mute B. Egede called the US delegation’s trip to the island “highly aggressive” in an interview with Greenlandic newspaper Sermitsiaq on Sunday, and raised particular objection to Waltz’s visit.

“What is the national security adviser doing in Greenland? The only purpose is to demonstrate power over us,” Egede said. “His mere presence in Greenland will no doubt fuel American belief in Trump’s mission — and the pressure will increase.”

Trump claimed on Monday that people in Greenland have responded warmly to the US’s recent interest in the territory. “They’re calling us. We’re not calling them. And we were invited over there,” he said.

“We’re dealing with a lot of people from Greenland that would like to see something happen with respect to them being properly protected and properly taken care of,” Trump told reporters following a meeting with his Cabinet.

“I think Greenland is going to be something that maybe is in our future,” Trump added.

The president said he believes Secretary of State Marco Rubio would be traveling to Greenland too.

Trump’s idea to annex Greenland has thrown an international spotlight on the territory, which holds vast stores of rare earth minerals critical for high-tech industries, and has raised questions about the island’s future security as the US, Russia and China vie for influence in the Arctic. Trump has repeatedly expressed interest in the US taking the island by force or economic coercion, even as Denmark and Greenland have firmly rejected the idea.

Michaeljak

19 Apr 2025 - 11:50 pm

Тяговые аккумуляторы для техники

Что такое тяговые аккумуляторы

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

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В отличие от стартерных аккумуляторов, тяговые батареи рассчитаны на глубочайший разряд и многократные циклы зарядразряд.

Главные типы тяговых аккумуляторов

* Кислотные (сурьмянистые, малосурьмянистые)
Классическая технология, проверенная годами. Отличаются невысокой ценой, 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 технического обслуживания, долгий срок эксплуатации. Минус высочайшая стоимость.

Преимущества использования тяговых аккумов

- Возможность неоднократного циклирования заряда и разряда
- Высокая отдача энергии при относительно малых габаритах
- Долговечность при правильной эксплуатации
- Безопасность (неподражаемо у герметизированных вариантов)
- Убавление расходов на горючее и обслуживание техники

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1. Ёмкость аккумулятора (Ач) подбирается на вырост, исходя из потребления техники.
2. Тип аккумулятора 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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Эксплуатация и сервис

- Соблюдайте аннотации по заряду и уровню.
- Не дозволяйте глубоких разрядов (в особенности для свинцово-кислотных моделей).
- Для обслуживаемых АКБ часто инспектируйте уровень электролита.
- Используйте только рекомендованные производителем зарядные устройства.
- Соблюдайте температурный режим хранения и использования.

Вывод

Верно подобранные и эксплуатируемые тяговые батареи обеспечат бесперебойную работу вашей техники, минимизируют затраты на обслуживание и эксплуатацию, также продлят срок эксплуатации оборудования. Великий выбор современных аккумуляторов позволяет подобрать решение под любые задачки и бюджет.

Rodgerabozy

19 Apr 2025 - 10:03 pm

Remote and rugged
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A more organic way to see this coast is by the multi-day coastal ferry, the long-running Sarfaq Ittuk, of the Arctic Umiaq Line. It’s less corporate than the modern cruise ships and travelers get to meet Inuit commuters. Greenland is pricey. Lettuce in a local community store might cost $10, but this coastal voyage won’t break the bank.

The hot ticket currently for exploring Greenland’s wilder side is to head to the east coast facing Europe. It’s raw and sees far fewer tourists, with a harshly dramatic coastline of fjords where icebergs drift south. There are no roads and the scattered population of just over 3,500 people inhabit a coastline roughly the distance from New York to Denver.

A growing number of small expedition vessels probe this remote coast for its frosted scenery and wildlife. Increasingly popular is the world’s largest fjord system of Scoresby Sound with its sharp-fanged mountains and hanging valleys choked by glaciers. Sailing north is the prosaically named North East Greenland National Park, fabulous for spotting wildlife on the tundra.

Travelers come to see polar bears which, during the northern hemisphere’s summer, move closer to land as the sea-ice melts. There are also musk oxen, great flocks of migrating geese, Arctic foxes and walrus.
Some of these animals are fair game for the local communities. Perhaps Greenland’s most interesting cultural visit is to a village that will take longer to learn how to pronounce than actually walk around — Ittoqqortoormiit. Five hundred miles north of its neighboring settlement, the 345 locals are frozen in for nine months of the year. Ships sail in to meet them during the brief summer melt between June and August.

Locked in by ice, they’ve retained traditional habits.

“My parents hunt nearly all their food,” said Mette Barselajsen, who owns Ittoqqortoormiit’s only guesthouse. “They prefer the old ways, burying it in the ground to ferment and preserve it. Just one muskox can bring 440 pounds of meat.”

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19 Apr 2025 - 09:44 pm

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Scottmaigh

19 Apr 2025 - 09:35 pm

Iceberg flotillas
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Located on the west coast, Ilulissat is a pretty halibut- and prawn-fishing port on a dark rock bay where visitors can sit in pubs sipping craft beers chill-filtered by 100,000-year-old glacial ice.

It’s a place to be awed by the UNESCO World Heritage Icefjord where Manhattan skyscraper-sized icebergs disgorge from Greenland’s icecap to float like ghostly ships in the surrounding Disko Bay.

Small boats take visitors out to sail closely among the bay’s magnificent iceberg flotilla. But not too close.

“I was on my boat once and saw one of these icebergs split in two. The pieces fell backwards into the sea and created a giant wave,” said David Karlsen, skipper of the pleasure-boat, Katak. “…I didn’t hang around.”

Disko Bay’s other giants are whales. From June to September breaching humpback whales join the likes of fin and minke whales feasting on plankton. Whale-watching is excellent all around Greenland’s craggy coastline.

Whales are eaten here. Visitors shouldn’t be surprised to encounter the traditional Greenlandic delicacy of mattak — whale-skin and blubber that when tasted is akin to chewing on rubber. Inuit communities have quotas to not only hunt the likes of narwhals but also polar bears, musk-ox and caribou — which can also appear on menus.

Kevinflego

19 Apr 2025 - 09:10 pm

A long time in the making
Curiosity landed in Gale Crater on August 6, 2012. More than 12 years later, the rover has driven over 21 miles (34 kilometers) to ascend Mount Sharp, which is within the crater. The feature’s many layers preserve millions of years of geological history on Mars, showing how it shifted from a wet to a dry environment.
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Perhaps one of the most valuable samples Curiosity has gathered on its mission to understand whether Mars was ever habitable was collected in May 2013.

The rover drilled the Cumberland sample from an area within a crater called Yellowknife Bay, which resembled an ancient lake bed. The rocks from Yellowknife Bay so intrigued Curiosity’s science team that it had the rover drive in the opposite direction to collect samples from the area before heading to Mount Sharp.
Since collecting the Cumberland sample, Curiosity has used SAM to study it in a variety of ways, revealing that Yellowknife Bay was once the site of an ancient lake where clay minerals formed in water. The mudstone created an environment that could concentrate and preserve organic molecules and trapped them inside the fine grains of the sedimentary rock.

Freissinet helped lead a research team in 2015 that was able to identify organic molecules within the Cumberland sample.

The instrument detected an abundance of sulfur, which can be used to preserve organic molecules; nitrates, which are essential for plant and animal health on Earth; and methane composed of a type of carbon associated with biological processes on Earth.

“There is evidence that liquid water existed in Gale Crater for millions of years and probably much longer, which means there was enough time for life-forming chemistry to happen in these crater-lake environments on Mars,” said study coauthor Daniel Glavin, senior scientist for sample return at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, in a statement.

Leonardten

19 Apr 2025 - 08:41 pm

Everyone is talking about Greenland. Here’s what it’s like to visit
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A few months ago, Greenland was quietly getting on with winter, as the territory slid deeper into the darkness that envelops the world’s northerly reaches at this time of year.

But President Donald Trump’s musings about America taking over this island of 56,000 largely Inuit people, halfway between New York and Moscow, has seen Greenland shaken from its frozen Arctic anonymity.

Denmark, for whom Greenland is an autonomous crown dependency, has protested it’s not for sale. Officials in Greenland, meanwhile, have sought to assert the territory’s right to independence.

The conversation continues to intensify. A contentious March 28 visit to a US military installation by Usha Vance, the second lady, accompanied by her husband, Vice President JD Vance, was the latest in a series of events to focus attention on Trump’s ambitions for Greenland.

The visit was originally planned as a cultural exchange, but was shortened following complaints from Greenland Prime Minister Mute B. Egede.

Had the Vances prolonged their scheduled brief visit, they would’ve discovered a ruggedly pristine wildernesses steeped in rich Indigenous culture.

An inhospitable icecap several miles deep covers 80% of Greenland, forcing the Inuit to dwell along the shorelines in brightly painted communities. Here, they spend brutally cold winters hunting seals on ice under the northern lights in near perpetual darkness. Although these days, they can also rely on community stores.

The problem for travelers over the years has been getting to Greenland via time-consuming indirect flights. That’s changing. Late in 2024, the capital Nuuk opened a long-delayed international airport. From June 2025, United Airlines will be operating a twice-weekly direct service from Newark to Nuuk.

Two further international airports are due to open by 2026 — Qaqortoq in South Greenland and more significantly in Ilulissat, the island’s only real tourism hotspot.

Michaeljak

19 Apr 2025 - 06:20 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 основное 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 глубокий разряд и многократные циклы зарядразряд.

Главные типы тяговых аккумуляторов

* Кислотные (сурьмянистые, малосурьмянистые)
Традиционная технология, проверенная годами. Отличаются низкой 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 стоимость.

Преимущества использования тяговых аккумуляторов

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

На что обратить внимание при выборе

1. Ёмкость аккума (Ач) подбирается с запасом, исходя из употребления техники.
2. Тип аккумулятора наличие требований к обслуживанию, безопасность, рабочие условия.
3. Напряжение батареи должно соответствовать требованиям техники.
4. Размеры и форма соответствие батарейного отсека.
5. Репутация производителя по этой причине зависит качество и ресурс батареи http://xn----ptbagsgdho0d.xn--p1ai/index.php?subaction=userinfo&user=owureky

Эксплуатация и сервис

- Соблюдайте инструкции 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.
- Соблюдайте температурный режим хранения и использования.

Вывод

Правильно подобранные и эксплуатируемые тяговые батареи обеспечат бесперебойную работу вашей техники, минимизируют издержки на обслуживание и эксплуатацию, также продлят срок эксплуатации оборудования. Великий выбор современных аккумуляторов дает возможность подобрать решение под любые задачи и бюджет.

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19 Apr 2025 - 05:33 pm

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