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@DrPlanktonguy@ecoevo.social
2025-10-11 13:45:28

Weekend #Plankton Factoid 🦠🦐
Heliozoans are a group of amoeboid protists found commonly in both fresh and saltwater. They were termed sun-animalcules due to their spherical shape and distinctive radiating microtubules, which support axiopods used to capture food and facilitate movement. Some will also capture symbiotic algal cells which provide energy through photosynthesis. Heliozoa is &quo…

image/png a microscopic image of a spherical yellow organism filled with green dots and having numerous spines radiating from the surface. A scale of 50 microns indicates the sphere is about twice that measure. James L. Van Etten, Irina V. Agarkova, David D. Dunigan CC BY-SA 4.0.
https://commons.wikimedia.org/wiki/File:Viruses-12-00020-g001_Chlorella_Virus_(C).png#mw-jump-to-license

image/jpeg a black and white diagram of a spherical cell with many radiating spines. The interior of the cell has many dark or white inclusions. Source unknown. 1888. Public Domain.
https://commons.wikimedia.org/wiki/File:Ott%C5%AFv_slovn%C3%ADk_nau%C4%8Dn%C3%BD_-_obr%C3%A1zek_%C4%8D._035_wb.jpg#mw-jump-to-license

@UP8@mastodon.social
2025-12-27 02:25:58

⏳Seems like forever since I pulled out the 90mm/2.8 lens that I used to shoot this African daisy last summer... and yeah, I will reboot my photo processing pipeline one of these days
#photo #photography #flowers

Flower with numerous petals that are red at the base turning yellow to the tips seen from the side coming out of a single stem with pleasantly blurred leaves and a splash of orange near the top which must have been another flower of some kind

@leftsidestory@mstdn.social
2025-10-16 00:30:03

Moody Urbanity - Up Up ⏏️
情绪化城市 - 上面上面 ⏏️
📷 Pentax MX
🎞️ Kentmere Pan 400
#filmphotography #Photography #blackandwhite

Kentmere Kentmere PAN 400 (FF)

English Alt Text:
A black-and-white photo of a multi-story building with numerous air conditioning units mounted beneath each window. The building has a flat roof with a corrugated edge. Above it, the sky is partly cloudy. In the background, a tall antenna or communication tower rises, suggesting an urban or semi-urban location. The image has a vintage, documentary feel, emphasizing the industrial and functional aspects of the architecture.

中文替代文字：
这是一张黑白照片，展示了一…

Kentmere Kentmere PAN 400 (FF)

English Alt Text:
A black-and-white image showing the top of a building with a corrugated roof. Several rectangular HVAC units are installed on the roof. A crane arm extends upward from the right side, with a hook hanging down. The sky is partly cloudy, with dramatic contrasts between light and dark clouds. The composition highlights industrial elements against a natural sky.

中文替代文字：
这是一张黑白照片，画面为一栋建筑的屋顶，屋顶呈波纹状，上面安装了多个矩形的空调设备。右侧有一只起重机臂向上延伸，吊钩悬挂在空中。天空中云层交错，明暗对比强烈，…

Kentmere Kentmere PAN 400 (FF)

English Alt Text:
A grayscale cityscape featuring modern high-rise buildings with varied architectural styles—some cylindrical, others rectangular with glass facades. An elevated highway cuts diagonally across the foreground, supported by concrete pillars. Streetlights line the road, and a tree sits on the left. Fog or low clouds partially obscure one building, adding a moody, atmospheric tone.

中文替代文字：
这是一幅灰度城市景观图，展示了多座现代高楼，建筑风格各异，有圆柱形，也有玻璃幕墙的矩形结构。前景中，一条高架公路斜穿画面…

Kentmere Kentmere PAN 400 (FF)

English Alt Text:
A monochrome photo of tall, uniform apartment buildings in the background, likely part of a residential complex. In the foreground, dense trees and foliage partially obscure the lower parts of the buildings. A streetlight stands on the left side. The sky is clear, and the image captures the coexistence of urban living and nature.

中文替代文字：
这是一张黑白照片，背景是几栋高大且设计统一的公寓楼，可能属于一个住宅区。前景中有茂密的树木和植被，遮挡了建筑物的下部。左侧有一盏路灯。天空晴朗，画面展现了城市居住环境与自然绿化的共存。

@UP8@mastodon.social
2025-10-22 01:54:36

"Protect our Pollinators" Grafitti on a side street near the Ithaca Commons
#photo #photography #ithaca #grafitti

A wall immediately in front of us has numerous attachments but has painted over with "Protect our POLLINATORS" and three stars in purple stroke and green fill surrounded by purple and yellow flowers and a maze of red and purple lines behind that

@arXiv_csLG_bot@mastoxiv.page
2025-12-22 10:32:40

Convergence Guarantees for Federated SARSA with Local Training and Heterogeneous Agents
Paul Mangold, Elo\"ise Berthier, Eric Moulines
https://arxiv.org/abs/2512.17688 https://arxiv.org/pdf/2512.17688 https://arxiv.org/html/2512.17688
arXiv:2512.17688v1 Announce Type: new
Abstract: We present a novel theoretical analysis of Federated SARSA (FedSARSA) with linear function approximation and local training. We establish convergence guarantees for FedSARSA in the presence of heterogeneity, both in local transitions and rewards, providing the first sample and communication complexity bounds in this setting. At the core of our analysis is a new, exact multi-step error expansion for single-agent SARSA, which is of independent interest. Our analysis precisely quantifies the impact of heterogeneity, demonstrating the convergence of FedSARSA with multiple local updates. Crucially, we show that FedSARSA achieves linear speed-up with respect to the number of agents, up to higher-order terms due to Markovian sampling. Numerical experiments support our theoretical findings.
toXiv_bot_toot

@UP8@mastodon.social
2025-12-18 03:09:03

Downward Facing Daffodil (... got winter photos coming but boy is it cold and a project I started around 2007 is finally taking off)
#photo #photography #spring

Daffodil with 6 yellow petals and an orange cylinder core with a bit of another daffodil behind and numerous fleshy green shoots in back

@UP8@mastodon.social
2026-01-02 23:11:19

Gorgeous 𝐶𝑜𝑙𝑒𝑢𝑠 leaves spotted in a bed in the Ithaca Commons
#plants #photo #photography #ithaca …

Numerous heart-shaped leaves seen from above in multiple layers and various sizes which are mostly purple with green edges and green dots in the interior

@UP8@mastodon.social
2025-10-25 01:42:53

Fall Color Oaks On the Ag Quad
#photo #photography #cornell #fall

Numerous red oak leaves in the foreground coming down drom the top with a grassy field with leaves interrupted by a 4-shape of concrete paths with outlines of buildings and blurry people walking on the paths

@UP8@mastodon.social
2025-10-16 01:42:27

Zinnia I saw somewhere around the Ithaca Commons this summer
#photo #photography #flowers #bloomscrolling

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