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Wesleysip

19 Jan 2025 - 11:47 pm

Scientists have identified an estimated 10% of all species on Earth. Here’s what they found in 2024
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A toothy toadstool. A vegetarian piranha with a distinctive mark. And a pygmy pipehorse floating in the Indian Ocean shallows.

These wild wonders were among the hundreds of previously unknown species of animals, plants and fungi that scientists named and described for the first time in 2024, expanding our surprisingly limited knowledge of Earth’s diversity.

“Scientists estimate that we’ve identified only one-tenth of all species on Earth,” said Dr.
Shannon Bennett, chief of science at the California Academy of Sciences, in a statement.

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“While it is critical to place protections on known threatened species, we must also allocate resources towards identifying unknown species that may be just as important to the functioning of an ecosystem,” Bennett said.

Researchers connected to the institution described 138 new species in 2024, including 32 fish. One standout was a pygmy pipehorse named Cylix nkosi. The seahorse relative was originally found in 2021 in the cool temperate waters surrounding the North Island of New Zealand, but the species described this year was discovered in the subtropical waters off South Africa, expanding the known range of this group to the Indian Ocean

“South African reefs present notoriously difficult diving conditions with rough weather and intense, choppy waves — we knew we only had one dive to find it,” underwater photographer and marine biologist Richard Smith said in a statement.
“This species is also quite cryptic, about the size of a golf tee, but luckily we spotted a female camouflaged against some sponges about a mile offshore on the sandy ocean floor.”

The researchers involved in describing the new species chose nkosi as its name. A reference to the local Zulu word for “chief,” the name reflects the species’ crown-like head shape and acknowledges South Africa’s KwaZulu-Natal province where it was found.

Jeromeriste

19 Jan 2025 - 11:46 pm

The survivors of recent crashes were sitting at the back of the plane. What does that tell us about airplane safety?
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Look at the photos of the two fatal air crashes of the last two weeks, and amid the horror and the anguish, one thought might come to mind for frequent flyers.

The old frequent-flyer adage is that sitting at the back of the plane is a safer place to be than at the front — and the wreckage of both Azerbaijan Airlines flight 8243 and Jeju Air flight 2216 seem to bear that out.
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The 29 survivors of the Azeri crash were all sitting at the back of the plane, which split into two, leaving the rear half largely intact. The sole survivors of the South Korean crash, meanwhile, were the two flight attendants in their jumpseats in the very tail of the plane.

So is that old adage — and the dark humor jokes about first and business class seats being good until there’s a problem with the plane — right after all?

In 2015, TIME Magazine reporters wrote that they had combed through the records of all US plane crashes with both fatalities and survivors from 1985 to 2000, and found in a meta-analysis that seats in the back third of the aircraft had a 32% fatality rate overall, compared with 38% in the front third and 39% in the middle third.

Even better, they found, were middle seats in that back third of the cabin, with a 28% fatality rate. The “worst” seats were aisles in the middle third of the aircraft, with a 44% fatality rate.
But does that still hold true in 2024?

According to aviation safety experts, it’s an old wives’ tale.

“There isn’t any data that shows a correlation of seating to survivability,” says Hassan Shahidi, president of the Flight Safety Foundation. “Every accident is different.”

“If we’re talking about a fatal crash, then there is almost no difference where one sits,” says Cheng-Lung Wu, associate professor at the School of Aviation of the University of New South Wales, Sydney.

Ed Galea, professor of fire safety engineering at London’s University of Greenwich, who has conducted landmark studies on plane crash evacuations, warns, “There is no magic safest seat.”

Zhedazcaxra

19 Jan 2025 - 11:44 pm

Balanset-1A: Auswuchtgerät für Rotoren

Balanset-1A ist ein Zwei-Kanal-Gerät für das Auswuchten und die Vibrationsanalyse. Es eignet sich für das Auswuchten von Rotoren wie Brechern, Lüftern, Mulchern an Mähdreschern, Wellen, Zentrifugen, Turbinen und mehr.



Eigenschaften:



Vibrometer-Modus:



Tachometer: Misst genau die Drehzahl (U/min).

Phase: Bestimmt den Phasenwinkel der Vibrationsignale für präzise Analysen.

1x Vibration: Misst und analysiert die Grundfrequenzkomponente.

FFT-Spektrum: Bietet einen detaillierten Blick auf das Frequenzspektrum der Vibrationsignale.

Gesamtvibration: Misst und überwacht die Gesamtvibrationspegel.

Messprotokoll: Speichert die Messdaten zur Analyse.



Auswuchtungsmodus:



Einflächenauswuchtung: Wuchtet Rotoren in einer Ebene aus, um Vibrationen zu reduzieren.

Zweiflächenauswuchtung: Wuchtet Rotoren in zwei Ebenen für eine dynamische Auswuchtung.

Polardiagramm: Visualisiert das Ungleichgewicht in einem polaren Diagramm zur genauen Gewichtsplatzierung.

Letzte Sitzung wiederherstellen: Ermöglicht das Fortsetzen einer vorherigen Auswuchtsitzung für Bequemlichkeit.

Toleranzrechner (ISO 1940): Berechnet die akzeptable Auswuchttoleranz gemäß dem ISO 1940-Standard.

Auswuchten von Schleifscheiben: Kreisförmige Nut – verwendet für das Auswuchten von Schleifscheiben. In diesem Fall werden 3 Gegengewichte verwendet, um das Ungleichgewicht zu beseitigen.







Zusätzliche Funktionen:



Archiv: Speichern und Zugreifen auf frühere Auswuchtsitzungen.

Berichte: Erstellen detaillierter Berichte über die Auswuchtergebnisse.

Wiederholtes Auswuchten: Wiederholen Sie den Auswuchtvorgang einfach mit gespeicherten Daten.

Serienauswuchten: Geeignet für das Auswuchten von Rotoren in der Serienproduktion.





Prozess des Rotorauswuchtens mit dem Gerät Balanset-1A von Vibromera:



Vorbereitung des Equipments:

Installieren Sie die Vibrationsfühler senkrecht zur Rotationsachse des Rotors. Befestigen Sie den Laser-Tachometer an einem Magnetständer und richten Sie ihn auf das Reflektorband, das am Riemenscheibe angebracht ist. Schließen Sie die Sensoren am Gerät an und verbinden Sie das Gerät über USB mit einem Laptop. Starten Sie die Balanset-Software und wählen Sie den Auswuchtmodus in zwei Ebenen.



Erstmessung der Vibration:

Hängen Sie eine Testlast auf und notieren Sie deren Gewicht und Installationsradius. Starten Sie den Rotor und messen Sie das anfängliche Vibrationsniveau, um die Amplitude und Phase des ursprünglichen Ungleichgewichts zu bestimmen.



Auswuchten in der ersten Ebene:

Legen Sie die Testlast in die erste Auswuchtebene entsprechend der Position des ersten Sensors. Starten Sie den Rotor zur Messung des Vibrationsniveaus. Es ist wichtig, dass sich Amplitude oder Phase um mindestens 20 % ändern – dies deutet darauf hin, dass das Ungleichgewicht teilweise korrigiert wurde.



Auswuchten in der zweiten Ebene:

Verschieben Sie die Testlast in die zweite Ebene (wo der zweite Sensor installiert ist), starten Sie erneut den Rotor und führen Sie die Messung durch. Diese Daten helfen dem Programm, die genaue Position und das Gewicht der Auswuchtgewichte zu berechnen.



Korrektur des Ungleichgewichts:

Basierend auf den erhaltenen Daten schlägt das Balanset-Programm Auswuchtgewichte und deren Installationswinkel für beide Ebenen vor. Entfernen Sie die Testlast, bereiten Sie die Auswuchtgewichte gemäß den Programmanforderungen vor und installieren Sie sie unter dem richtigen Winkel in Richtung der Rotorrotation von der ursprünglichen Position der Testlast.



Überprüfung und Abschluss des Auswuchtens:

Starten Sie den Rotor zur endgültigen Überprüfung des Auswuchtens. Wenn die Vibration auf ein akzeptables Niveau gesunken ist, ist der Prozess abgeschlossen. Bei Bedarf zusätzliche Korrekturen vornehmen, wird das Programm anzeigen, wo und wie viel zusätzliches Gewicht installiert werden muss.

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Dannyfug

19 Jan 2025 - 11:34 pm

A year ago today, things went from bad to worse for Boeing
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At 5 p.m. PT on January 5, 2024, Boeing seemed like a company on the upswing. It didn’t last. Minutes later, a near-tragedy set off a full year of problems.

As Alaska Airlines flight 1282 climbed to 16,000 feet in its departure from Portland, Oregon, a door plug blew out near the rear of the plane, leaving a gaping hole in the fuselage. Phones and clothing were ripped away from passengers and sent hurtling into the night sky. Oxygen masks dropped, and the rush of air twisted seats next to the hole toward the opening.
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Fortunately, those were among the few empty seats on the flight, and the crew got the plane on the ground without any serious injuries. The incident could have been far worse — even a fatal crash.

Not much has gone right for Boeing ever since. The company has had one misstep after another, ranging from embarrassing to horrifying. And many of the problems are poised to extend into 2025 and perhaps beyond.

The problems were capped by another Boeing crash in South Korea that killed 179 people on December 29 in what was in the year’s worst aviation disaster. The cause of the crash of a 15-year old Boeing jet flown by Korean discount carrier Jeju Air is still under investigation, and it is quite possible that Boeing will not be found liable for anything that led to the tragedy.
But unlike the Jeju crash, most of the problems of the last 12 months have clearly been Boeing’s fault.

And 2024 was the sixth straight year of serious problems for the once proud, now embattled company, starting with the 20-month grounding of its best selling plane, the 737 Max, following two fatal crashes in late 2018 and early 2019, which killed 346 people.

Still the outlook for 2024 right before the Alaska Air incident had been somewhat promising. The company had just achieved the best sales month in its history in December 2023, capping its strongest sales year since 2018.

It was believed to be on the verge of getting Federal Aviation Administration approval for two new models, the 737 Max 7 and Max 10, with airline customers eager to take delivery. Approvals and deliveries of its next generation widebody, the 777X, were believed to be close behind. Its production rate had been climbing and there were hopes that it could be on the verge of returning to profitability for the first time since 2018.

Donaldemext

19 Jan 2025 - 11:33 pm

Most plane crashes are ‘survivable’
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First, the good news. “The vast majority of aircraft accidents are survivable, and the majority of people in accidents survive,” says Galea. Since 1988, aircraft — and the seats inside them — must be built to withstand an impact of up to 16G, or g-force up to 16 times the force of gravity. That means, he says, that in most incidents, “it’s possible to survive the trauma of the impact of the crash.”

For instance, he classes the initial Jeju Air incident as survivable — an assumed bird strike, engine loss and belly landing on the runway, without functioning landing gear. “Had it not smashed into the concrete reinforced obstacle at the end of the runway, it’s quite possible the majority, if not everyone, could have survived,” he says.

The Azerbaijan Airlines crash, on the other hand, he classes as a non-survivable accident, and calls it a “miracle” that anyone made it out alive.
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Most aircraft involved in accidents, however, are not — as suspicion is growing over the Azerbaijan crash — shot out of the sky.

And with modern planes built to withstand impacts and slow the spread of fire, Galea puts the chances of surviving a “survivable” accident at at least 90%.

Instead, he says, what makes the difference between life and death in most modern accidents is how fast passengers can evacuate.

Aircraft today must show that they can be evacuated in 90 seconds in order to gain certification. But a theoretical evacuation — practiced with volunteers at the manufacturers’ premises — is very different from the reality of a panicked public onboard a jet that has just crash-landed.
Galea, an evacuation expert, has conducted research for the UK’s Civil Aviation Authority (CAA) looking at the most “survivable” seats on a plane. His landmark research, conducted over several years in the early 2000s, looked at how passengers and crew behaved during a post-crash evacuation, rather than looking at the crashes themselves. By compiling data from 1,917 passengers and 155 crew involved in 105 accidents from 1977 to 1999, his team created a database of human behavior around plane crashes.

His analysis of which exits passengers actually used “shattered many myths about aircraft evacuation,” he says. “Prior to my study, it was believed that passengers tend to use their boarding exit because it was the most familiar, and that passengers tend to go forward. My analysis of the data demonstrated that none of these myths were supported by the evidence.”

Kazinofaine

19 Jan 2025 - 11:28 pm

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19 Jan 2025 - 11:23 pm

On a long-dormant pad in Florida, a rocket that could challenge SpaceX’s dominance is poised to launch
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On a Florida launchpad that has been dormant for almost two decades, a new, roughly 320-foot (98-meter) rocket — developed by Jeff Bezos’ company Blue Origin — is poised for its maiden flight.

The uncrewed launch vehicle, called New Glenn, will mark Blue Origin’s first attempt to send a rocket to orbit, a feat necessary if the company hopes to chip away at SpaceX’s long-held dominance in the industry.

New Glenn is set to lift off from Cape Canaveral Space Force Station as early as next week.
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The rocket, which stands about as tall as a 30-story building, consists of several parts: The first-stage rocket booster gives the initial thrust at liftoff. Atop the booster is an upper rocket stage that includes a cargo bay protected by a nose cone that will house experimental technology for this mission.

And, in an attempt to replicate the success that SpaceX has found reusing rocket boosters over the past decade, Blue Origin will also aim to guide New Glenn’s first-stage rocket booster back to a safe landing on a seafaring platform — named Jacklyn for Bezos’ mother — minutes after takeoff.

Like SpaceX, Blue Origin will seek to recover, refurbish and reuse first-stage rocket boosters to drive down costs.

For this inaugural mission, a smooth flight is not guaranteed.

But the eventual success of New Glenn, named after storied NASA astronaut John Glenn, is instrumental to some of Blue Origin’s most ambitious goals.

The rocket could one day power national security launches, haul Amazon internet satellites to space and even help in the construction of a space station that Blue Origin is developing with commercial partners.

Jerryrew

19 Jan 2025 - 11:16 pm

Chile’s President Boric leads journey to South Pole in historic trip
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Chile’s President Gabriel Boric travelled to Antarctica’s South Pole on Friday, a place where no other Latin American president has set foot, according to the Chilean government.

Boric led the historic two-day trip, named Operation Pole Star III, to extend the environmental monitoring of pollutants on Antarctica, Chile’s government said in a statement.

He travelled with scientists, armed forces commanders and government ministers from the Chilean capital of Santiago to Punta Arenas, a city in southern Chile, public broadcaster Television Nacional de Chile (TVN) reported. From there, they made several stops before finally reaching the US-run Amundsen-Scott South Pole Station, according to TVN.
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Chile is one of seven countries that has a territorial claim in Antarctica, alongside Argentina, Australia, France, New Zealand, Norway and the United Kingdom.

It is also a signatory of the Antarctic Treaty, which dictates that the continent may only be used for peaceful and scientific purposes.

While Chile has historically carried out scientific activity in Antarctica’s northern sector, the country’s government is now hoping to expand research into the west of the continent, its statement said.
Boric called his trip to the South Pole an “honor” and a source of pride, TVN reported.

“This is a milestone for us. It is the first time a Chilean and Latin American President has visited the South Pole,” he said, according to TVN.

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