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@iam_jfnklstrm@social.linux.pizza
2026-01-07 21:14:59

We have too much snow where I live. Going to the train this morning felt like walking in a maze of snow. The 'true detective 3' feeling. Apparently it has been continuing to snow during the day so now I hope that I'll make it home from the train station

A snowy urban scene at night, featuring illuminated apartment buildings, a snow-covered pathway with tire tracks, and trees dusted with snow. Flakes are visibly falling, creating a serene winter atmosphere.
@UP8@mastodon.social
2026-02-07 14:46:52

The foxographer was heading back to its secondary den after completing an assignment and caught the kind of snow falling photo we've been looking for lately
#photo #photography #cornell

A vertical white banner that reads "Cornell (red) Bowers (black)" hangs from a pole surrounded by small snowflakes and a few large circles of close snowflakes that are out of focus at night, in the far background find a spear of yellow which is the ceiling of the cantilevered portion of Gates Hall and the illuminated windows of the hotel school.
@bourgwick@heads.social
2026-01-26 02:29:07

spent a peaceful sunday snow-in finishing @…'s epic forthcoming alice coltrane bio, following her illuminated thread from '60s #jazz into the wide & wider universe. the chronicle of an earthly life spent looking beyond and/or even d…

Andy Beta, Cosmic Music book
@arXiv_physicsoptics_bot@mastoxiv.page
2025-11-25 09:19:33

Graphene and thin graphite films for ultrafast optical Kerr gating at 1 GHz repetition rate under focused illumination
Amr Farrag, Assegid M. Flatae, Mario Agio
arxiv.org/abs/2511.17713 arxiv.org/pdf/2511.17713 arxiv.org/html/2511.17713
arXiv:2511.17713v1 Announce Type: new
Abstract: The ability to address sub-picosecond events of weak optical signals is essential for progress in quantum science, nonlinear optics, and ultrafast spectroscopy. While up-conversion and optical Kerr gating (OKG) offer femtosecond resolution, they are generally limited to ensemble measurements, making ultrafast detection in nano-optics challenging. OKG, with its broadband response and high throughput without phase-matching, is especially promising when used at high repetition rates under focused illumination.
Here, we demonstrate an ultrafast detection scheme using the third-order nonlinearity of graphene and thin graphite films, operating at 1 GHz with sub-nanojoule pulses and achieving 141 fs temporal resolution. Their exceptionally large nonlinear refractive index, orders of magnitude higher than conventional Kerr media, enhances detection efficiency at smaller thicknesses, enables sub-picosecond response, and supports broadband operation. Their atomic-scale thickness minimizes dispersion and simplifies integration with microscopy platforms, optical fibers, and nanophotonic circuits, making them a compact, practical material platform for nano-optical and on-chip ultrafast Kerr gating.
toXiv_bot_toot

@cdarwin@c.im
2025-12-18 15:08:07

The American patrol satellite had the targets in its sights:
two recently launched Chinese spacecraft flying through one of the most sensitive neighborhoods in space.
Like any good tactical fighter,
the American spacecraft, known as USA 270, approached from behind,
so that the sun would be at its back, illuminating the quarry.
But then one of the Chinese satellites countered by slowing down.
As USA 270 zipped by, the Chinese satellite dropped in behind its…

Military satellites dogfighting as tensions escalate in orbit
U.S. and Chinese satellites routinely spy on each other in orbit, rehearsing for more aggressive operations in the event of war.

@leftsidestory@mstdn.social
2026-01-22 00:30:01

RED （Ocassionally） II 🔴
红 （有时） II 🔴
📷 Zeiss IKON Super Ikonta 533/16
🎞️ Harman Red 125 (6x6)
#filmphotography #Photography #blackandwhite

Harman Red 125 (6x6) English Alt Text: A close-up view of a traditional East Asian rooftop, likely Chinese, featuring ornate architectural details. The roof has curved eaves and upturned corners, with rows of dark tiles forming a rhythmic pattern. Decorative carvings adorn the edges, showcasing cultural craftsmanship. The image is heavily tinted with a magenta-pink filter, giving it a surreal, dreamlike quality. No sky or background is visible, focusing attention on the roof’s intricate design…
Harman Red 125 (6x6) English Alt Text: A quiet urban street lined with parked cars, including a white SUV in the foreground. Metal barricades are placed along the roadside, possibly for traffic control or construction. Trees and residential buildings line the street. The entire image is tinted with a strong orange-red filter, giving it a dramatic and surreal appearance. No people are visible, and the scene feels still and contemplative. 中文替代文字： 图像展示一条城市街道，路边停放着多辆汽车，前景是一辆白色SUV。金属护栏沿路摆放，可能用于交通管制…
Harman Red 125 (6x6) English Alt Text: An outdoor market scene with fresh produce displayed. Bundles of sugarcane lean against a brick wall. Plastic crates on the ground hold white radishes and other vegetables. A woven basket and plastic bags filled with produce are nearby. A red-framed glass door is open, revealing a sign in Chinese offering a small cash reward via QR code. The lighting casts a warm orange glow, enhancing the cozy, local atmosphere. 中文替代文字： 图像展示一个户外市场场景，地面上摆放着新鲜蔬菜。甘蔗成束靠在砖墙边，…
Harman Red 125 (6x6) English Alt Text: A storefront window of a traditional meat shop. A large piece of meat hangs inside, visible through the glass. Two warm-toned hanging lamps illuminate the interior, where shelves with various items are faintly seen. The window is framed in red, and the exterior wall is made of brick. The image is bathed in a reddish-orange hue, creating a nostalgic and atmospheric mood. Chinese signs flank the window but are blurred. 中文替代文字： 这是一家传统肉铺的橱窗图像。玻璃窗内挂着一块大肉，店内有两盏…
@leftsidestory@mstdn.social
2026-01-17 00:30:00

Gloom & Bloom IV ☁️🌺
黑暗绽放 IV ☁️ 🌺
📷 Zeiss IKON Super Ikonta 533/16
🎞️ Lucky SHD 400
#filmphotography #Photography #blackandwhite

Lucky SHD 400 (6x6) English: This black-and-white photograph captures an urban scene under a clear sky. In the foreground, there are trees with dense foliage, and a pedestrian staircase leading up to an elevated walkway or bridge. The staircase is flanked by a tall streetlight. The bridge extends horizontally across the image, supported by pillars. The overall atmosphere is calm, with a focus on the architectural elements and the contrast between the sky and the structures. Chinese (中文): 这张黑白照片…
Ilford HP5 Plus 400 (FF) English: This black-and-white photograph captures a daytime scene at a sports field or park. A row of empty bleacher seats is visible in the foreground, aligned along a chain-link fence. The fence is illuminated by day light, casting dramatic shadows and highlights. The background is dark, with silhouettes of trees and foliage, creating a stark contrast between the lit area and the shadows. Chinese (中文): 这张黑白照片拍摄于日间的运动场或公园。前景是一排空荡的看台座椅，沿着铁丝网围栏排列。围栏被明亮的日光照亮，投射出戏剧性的阴影和高光…
Lucky SHD 400 (6x6) English: This black-and-white image features a close-up of a white fire hydrant sign, which is shaped like a hydrant with an arch above it. The sign is positioned in front of a row of trees, creating a sense of depth. The trees are tall and slender, with their trunks and branches forming a rhythmic pattern. The background includes a paved path and neatly trimmed bushes, adding to the orderly and serene atmosphere of the scene. Chinese (中文): 这张黑白照片特写了一块白色消防栓标志，标志形状像消防栓，上方有拱形…
Lucky SHD 400 (6x6) English: This black-and-white image depicts a serene park or forest path. Tall, slender trees line both sides of the path, their trunks and branches creating a natural corridor. Two people are walking along the path in the distance, adding a sense of scale and life to the scene. The sunlight filters through the leaves, casting dappled light and shadow on the ground, enhancing the peaceful and tranquil atmosphere. Chinese (中文): 这张黑白照片展示了宁静的公园或森林小径。两侧是高大苗条的树木，树干和枝条形成天然走廊。远处有两个…