sendaikoyama

Latest Posts by sendaikoyama

実験2

python

import matplotlib def func(a, b): return a + b

実験

latex

\documentclass[a4paper]{jsarticle} \usepackage{theorem}

久々の投稿

久々の投稿である．

Twitter の騒動の後，Tumblr が ActivityPub に対応すると知って，云年ぶりに戻ってきた感じである．

ところで，Tumblr の markdown って，プログラムを表示するときにどう表示されるのか分からないので，試す．

def func(a, b): return a+b

The Artemis I Mission: To the Moon and Back

The Artemis I mission was the first integrated test of the Orion spacecraft, the Space Launch System (SLS) rocket, and Exploration Ground Systems at NASA’s Kennedy Space Center in Florida. We’ll use these deep space exploration systems on future Artemis missions to send astronauts to the Moon and prepare for our next giant leap: sending the first humans to Mars.

Take a visual journey through the mission, starting from launch, to lunar orbit, to splashdown.

Liftoff

The SLS rocket carrying the Orion spacecraft launched on Nov. 16, 2022, from Launch Complex 39B at NASA’s Kennedy Space Center in Florida. The world’s most powerful rocket performed with precision, meeting or exceeding all expectations during its debut launch on Artemis I.

"This is Your Moment"

Following the successful launch of Artemis I, Launch Director Charlie Blackwell-Thompson congratulates the launch team.

“The harder the climb, the better the view,” she said. “We showed the space coast tonight what a beautiful view it is.”

That's Us

On Orion’s first day of flight, a camera on the tip of one of Orion’s solar arrays captured this image of Earth.

Inside Orion

On the third day of the mission, Artemis I engineers activated the Callisto payload, a technology demonstration developed by Lockheed Martin, Amazon, and Cisco that tested a digital voice assistant and video conferencing capabilities in a deep space environment. In the image, Commander Moonikin Campos occupies the commander’s seat inside the spacecraft. The Moonikin is wearing an Orion Crew Survival System suit, the same spacesuit that Artemis astronauts will use during launch, entry, and other dynamic phases of their missions. Campos is also equipped with sensors that recorded acceleration and vibration data throughout the mission that will help NASA protect astronauts during Artemis II. The Moonikin was one of three “passengers” that flew aboard Orion. Two female-bodied model human torsos, called phantoms, were aboard. Zohar and Helga, named by the Israel Space Agency (ISA) and the German Aerospace Center (DLR) respectively, supported the Matroshka AstroRad Radiation Experiment (MARE), an experiment to provide data on radiation levels during lunar missions. Snoopy, wearing a mock orange spacesuit, also can be seen floating in the background. The character served as the zero-gravity indicator during the mission, providing a visual signifier that Orion is in space.

Far Side of the Moon

A portion of the far side of the Moon looms large in this image taken by a camera on the tip of one of Orion’s solar arrays on the sixth day of the mission.

First Close Approach

The Orion spacecraft captured some of the closest photos of the Moon from a spacecraft built for humans since the Apollo era — about 80 miles (128 km) above the lunar surface. This photo was taken using Orion’s optical navigational system, which captures black-and-white images of the Earth and Moon in different phases and distances.

Distant Retrograde Orbit

Orion entered a distant retrograde orbit around the Moon almost two weeks into the mission. The orbit is “distant” in the sense that it’s at a high altitude approximately 50,000 miles (80,467 km) from the surface of the Moon. Orion broke the record for farthest distance of a spacecraft designed to carry humans to deep space and safely return them to Earth, reaching a maximum distance of 268,563 miles (432,210 km).

Second Close Approach

On the 20th day of the mission, the spacecraft made its second and final close approach to the Moon flying 79.2 miles (127.5 km) above the lunar surface to harness the Moon’s gravity and accelerate for the journey back to Earth.

Cameras mounted on the crew module of the Orion spacecraft captured these views of the Moon’s surface before its return powered flyby burn.

Heading Home

After passing behind the far side of the Moon on Flight Day 20, Orion powered a flyby burn that lasted approximately 3 minutes and 27 seconds to head home. Shortly after the burn was complete, the Orion spacecraft captured these views of the Moon and Earth, which appears as a distant crescent.

Parachutes Deployed

Prior to entering the Earth’s atmosphere, Orion’s crew module separated from its service module, which is the propulsive powerhouse provided by ESA (European Space Agency). During re-entry, Orion endured temperatures about half as hot as the surface of the Sun at about 5,000 degrees Fahrenheit (2,760 degrees Celsius). Within about 20 minutes, Orion slowed from nearly 25,000 mph (40,236 kph) to about 20 mph (32 kph) for its parachute-assisted splashdown.

Splashdown

On Dec. 11, the Orion spacecraft splashed down in the Pacific Ocean off the coast of California after traveling 1.4 million miles (2.3 million km) over a total of 25.5 days in space. Teams are in the process of returning Orion to Kennedy Space Center in Florida. Once at Kennedy, teams will open the hatch and unload several payloads, including Commander Moonikin Campos, the space biology experiments, Snoopy, and the official flight kit. Next, the capsule and its heat shield will undergo testing and analysis over the course of several months.

Make sure to follow us on Tumblr for your regular dose of space!

SLAM学習のための参考書籍

こんばんは♪ 夏が終わったと思いきや、気づいたら11月も終わりかけですね。時が過ぎ去るのは早いw もっと有意義に時間を使わねば！と思う今日この頃です。

今日はSLAMを学習する上で私が参考にしたオススメの書籍を紹介したいと思います(^^)v まず１冊目はこれです！

『確率ロボティクス』

SLAM学習の鉄板、『確率ロボティクス』です！ この書籍はあの上田隆一先生が翻訳されたんですよ(^^) 10年前くらいに１度発売されてたんですけど、すぐに絶版となってしまい入手が非常に困難となっていました。いくら探しても見つからず諦めかけていたのですが、2015年4月にマイナビBOOKSより復活したことを知り、思わず購入ボタンをポチってしましました（笑） 内容は結構難しく、カルマンフィルタやベイズ統計の基礎知識を持っていないと理解するのが厳しいと思います。しかし、この本に書かれている内容を全て理解できたときは、SLAMエンジニアとしての大幅な戦闘力向上が見込めると思います(笑) 私が最もオススメする１冊です。現在、誠意学習中です！

確率ロボティクス　プレミアムブックス版

続いて２冊目です！

『カルマンフィルタの基礎』

『確率ロボティクス』にもカルマンフィルタの話は出てくるのですが、正直事細かくは書いてないです。よって、カルマンフィルタの知識がない人はまずこの本で学習してから『確率ロボティクス』を読むようにしたほうがよいと思います。 この本はカルマンフィルタについて、かなり細かく書かれています。数式の証明等もあるため、本書の内容を熟知できれば、『確率ロボティクス』のカルマンフィルタの章は余裕で理解できると思います。 しかし、カルマンフィルタは「ベイズ統計」ベースとしたアルゴリズムです。よって、本書を読む際に、「ベイズ統計」の知識を持っていた方がベターかと思われます。

最後、３冊目です！

『道具としてのベイズ統計』

「カルマンフィルタの基礎」を読んでいて、ベイズ統計の話が難しく感じたら、先に本書を読むことをオススメします。本書はベイズ統計について、かなり易しく書かれています。例題も結構あるため、問題を解きながら直感的に理解できるのではないかと思います。(^^)v

以上、私がオススメする３冊でした。

AiKaBuガチ勢のSKE48野村実代、株価暴落におこ「合言葉は 売らないでね！ です(^^)！」

【悲報】株価暴落まる(｀・ω・´) ｜野村実代｜ブログ｜SKE48 Mobilehttp://www2.ske48.co.jp/blog/detail/id:20180114222130949 皆さん！AiKaBuで遊んでいますかー？ どうもAiKaBuガチ勢みよまるです 画像を見てください。ストップ安と続落がついています これは危機。。。！と思いきやチャンスです！！！ 今の私の株価は85000YL！今が買い時です☆ しかし。売りが7000以上も出ています(TT)誰ですか。こんなに売ったの。 おこです みんなで力を合わせてまた株価上げましょうね！ 合言葉は売らないでね！です(^^)！ 頑張りましょう♪ みなさんぜひAiKaBuで遊んでくださいね(^_-)-☆そして、私の株主様になってください！ よろしくお願いしますっ 全文はこちら (more…)

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Solar System: 10 Things to Know This Week

January 8: Images for Your Computer or Phone Wallpaper

Need some fresh perspective? Here are 10 vision-stretching images for your computer desktop or phone wallpaper. These are all real pictures, sent recently by our planetary missions throughout the solar system. You’ll find more of our images at solarsystem.nasa.gov/galleries, images.nasa.gov and www.jpl.nasa.gov/spaceimages.

Applying Wallpaper: 1. Click on the screen resolution you would like to use. 2. Right-click on the image (control-click on a Mac) and select the option ‘Set the Background’ or 'Set as Wallpaper’ (or similar).

1. The Fault in Our Mars

This image from our Mars Reconnaissance Orbiter (MRO) of northern Meridiani Planum shows faults that have disrupted layered deposits. Some of the faults produced a clean break along the layers, displacing and offsetting individual beds.

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2. Jupiter Blues

Our Juno spacecraft captured this image when the spacecraft was only 11,747 miles (18,906 kilometers) from the tops of Jupiter’s clouds – that’s roughly as far as the distance between New York City and Perth, Australia. The color-enhanced image, which captures a cloud system in Jupiter’s northern hemisphere, was taken on Oct. 24, 2017, when Juno was at a latitude of 57.57 degrees (nearly three-fifths of the way from Jupiter’s equator to its north pole) and performing its ninth close flyby of the gas giant planet.

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3. A Farewell to Saturn

After more than 13 years at Saturn, and with its fate sealed, our Cassini spacecraft bid farewell to the Saturnian system by firing the shutters of its wide-angle camera and capturing this last, full mosaic of Saturn and its rings two days before the spacecraft’s dramatic plunge into the planet’s atmosphere on Sept. 15, 2017.

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4. All Aglow

Saturn’s moon Enceladus drifts before the rings, which glow brightly in the sunlight. Beneath its icy exterior shell, Enceladus hides a global ocean of liquid water. Just visible at the moon’s south pole (at bottom here) is the plume of water ice particles and other material that constantly spews from that ocean via fractures in the ice. The bright speck to the right of Enceladus is a distant star. This image was taken in visible light with the Cassini spacecraft narrow-angle camera on Nov. 6, 2011.

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5. Rare Encircling Filament

Our Solar Dynamics Observatory came across an oddity this week that the spacecraft has rarely observed before: a dark filament encircling an active region (Oct. 29-31, 2017). Solar filaments are clouds of charged particles that float above the Sun, tethered to it by magnetic forces. They are usually elongated and uneven strands. Only a handful of times before have we seen one shaped like a circle. (The black area to the left of the brighter active region is a coronal hole, a magnetically open region of the Sun).

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6. Jupiter’s Stunning Southern Hemisphere

See Jupiter’s southern hemisphere in beautiful detail in this image taken by our Juno spacecraft. The color-enhanced view captures one of the white ovals in the “String of Pearls,” one of eight massive rotating storms at 40 degrees south latitude on the gas giant planet. The image was taken on Oct. 24, 2017, as Juno performed its ninth close flyby of Jupiter. At the time the image was taken, the spacecraft was 20,577 miles (33,115 kilometers) from the tops of the clouds of the planet.

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7. Saturn’s Rings: View from Beneath

Our Cassini spacecraft obtained this panoramic view of Saturn’s rings on Sept. 9, 2017, just minutes after it passed through the ring plane. The view looks upward at the southern face of the rings from a vantage point above Saturn’s southern hemisphere.

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8. From Hot to Hottest

This sequence of images from our Solar Dynamics Observatory shows the Sun from its surface to its upper atmosphere all taken at about the same time (Oct. 27, 2017). The first shows the surface of the sun in filtered white light; the other seven images were taken in different wavelengths of extreme ultraviolet light. Note that each wavelength reveals somewhat different features. They are shown in order of temperature, from the first one at about 11,000 degrees Fahrenheit (6,000 degrees Celsius) on the surface, out to about 10 million degrees in the upper atmosphere. Yes, the sun’s outer atmosphere is much, much hotter than the surface. Scientists are getting closer to solving the processes that generate this phenomenon.

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9. High Resolution View of Ceres

This orthographic projection shows dwarf planet Ceres as seen by our Dawn spacecraft. The projection is centered on Occator Crater, home to the brightest area on Ceres. Occator is centered at 20 degrees north latitude, 239 degrees east longitude.

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10. In the Chasm

This image from our Mars Reconnaissance Orbiter shows a small portion of the floor of Coprates Chasma, a large trough within the Valles Marineris system of canyons. Although the exact sequence of events that formed Coprates Chasma is unknown, the ripples, mesas, and craters visible throughout the terrain point to a complex history involving multiple mechanisms of erosion and deposition. The main trough of Coprates Chasma ranges from 37 miles (60 kilometers) to 62 miles (100 kilometers) in width.

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Explore and learn more about our solar system at: solarsystem.nasa.gov/. 

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.

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Observing the Ozone Hole from Space: A Science Success Story

Using our unique ability to view Earth from space, we are working together with NOAA to monitor an emerging success story – the shrinking ozone hole over Antarctica.

Thirty years ago, the nations of the world agreed to the landmark ‘Montreal Protocol on Substances that Deplete the Ozone Layer.’ The Protocol limited the release of ozone-depleting chlorofluorocarbons (CFCs) into the atmosphere.

Since the 1960s our scientists have worked with NOAA researchers to study the ozone layer. 

We use a combination of satellite, aircraft and balloon measurements of the atmosphere.

The ozone layer acts like a sunscreen for Earth, blocking harmful ultraviolet, or UV, rays emitted by the Sun.

In 1985, scientists first reported a hole forming in the ozone layer over Antarctica. It formed over Antarctica because the Earth’s atmospheric circulation traps air over Antarctica.  This air contains chlorine released from the CFCs and thus it rapidly depletes the ozone.

Because colder temperatures speed up the process of CFCs breaking up and releasing chlorine more quickly, the ozone hole fluctuates with temperature. The hole shrinks during the warmer summer months and grows larger during the southern winter. In September 2006, the ozone hole reached a record large extent.

But things have been improving in the 30 years since the Montreal Protocol. Thanks to the agreement, the concentration of CFCs in the atmosphere has been decreasing, and the ozone hole maximum has been smaller since 2006’s record.

That being said, the ozone hole still exists and fluctuates depending on temperature because CFCs have very long lifetimes. So, they still exist in our atmosphere and continue to deplete the ozone layer.

To get a view of what the ozone hole would have looked like if the world had not come to the agreement to limit CFCs, our scientists developed computer models. These show that by 2065, much of Earth would have had almost no ozone layer at all.

Luckily, the Montreal Protocol exists, and we’ve managed to save our protective ozone layer. Looking into the future, our scientists project that by 2065, the ozone hole will have returned to the same size it was thirty years ago.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

Thank you to our fans from around the world for your outpouring of love and support.

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なぜ道民や東北人は雪かきに風呂の残り湯を使わないのか・・・・・・

1：以下、＼(^o^)／でVIPがお送りします:2017/01/15(日) 13:26:27.775 ID:a/CwwX5K0.net 今日朝起きたら雪積もってたんだけどね パッと閃いたのよ 風呂の残り湯使えないかって で、一杯ザバーっとクルマにかけて もう二杯玄関周りにまいておしまい 30分とかからないね やはり頭を使って楽することを覚えないと行けないと思う 苦労するから価値があるってのは悪い考えと思うんだ 3：以下、＼(^o^)／でVIPがお送りします:2017/01/15(日) 13:27:14.847 ID:1Teux4Zfd.net 絶対にやるなよ 8：以下、＼(^o^)／でVIPがお送りします:2017/01/15(日) 13:29:30.405 ID:a/CwwX5K0.net >>3 いや、実際に今日の朝起きてやったから 一瞬で終わったわ…

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【悲報】お母さんと一緒にアニメイトに行こう！とか言う狂気のフェアが始まる

1: 風吹けば名無し＠＼(^o^)／ 2017/01/18(水) 16:07:45.13 ID:8TAZ5DS60.net 【フェア情報】『お母さんと一緒にアニメイトに行こう！「ファンタジア大賞受賞4作品発売記念フェア」』が1/20開催！！対象商品を【お母さんと一緒に！】ご購入して頂いたお客様！！又は、対象商品を3冊ご購入で【小冊子】をプレゼントマチ★ pic.twitter.com/WDRKVcqQZK — アニメイト町田＠リニューアル (@animatemachida) 2017年1月18日 https://twitter.com/animatemachida/status/821528912157024256 2: 風吹けば名無し＠＼(^o^)／ 2017/01/18(水) 16:08:32.83 ID:o7SgdXRgM.net えぇ… 5: 風吹けば名無し＠＼(^o^)／…

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ちょっと前になりましたが、#あしかがフラワーパーク で撮った一枚。

土屋太鳳って可愛いかも知れないけど顔でかくないか？

1: 名無し募集中。。。＠＼(^o^)／ 2016/04/24(日) 00:54:04.78 0.net これ (more…)

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