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@jby@ecoevo.social
2025-07-10 19:58:26

Lady's slipper, Cypripedium acaule, along the carriage roads in Acadia National Park last month
#naturalist #wildflower #photography

An orchid with narrow strap-like "wings" flanking a bulbous pink labellum that looks a lot like a ballet slipper, lit by indirect sunlight
@leftsidestory@mstdn.social
2025-06-11 00:30:00

Urban Life 101 🏙️
城市生活 101 🏙️
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1995
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

Ilford FP4 E.I. 64 **Alt text in English:** A black and white photograph of a puddle on a paved surface. The puddle reflects a utility pole along with some surrounding trees or foliage. The reflection appears slightly distorted due to ripples and debris in the water. **Alt text in Chinese:** 一张黑白照片，显示在铺砌地面上的水坑。水坑倒映出一根电线杆以及一些周围的树木或植物。由于水面的波纹和碎屑，倒影看起来有些扭曲。
Ilford FP4 E.I. 64 **English Alt Text:** "A black and white photograph of a plant with large, broad leaves. The plant is situated indoors, near a window, with light filtering through the leaves, creating a dramatic contrast and shadow effect. The leaves are detailed and appear slightly wilted or drooping." **Chinese Alt Text:** "一张黑白照片，展示了一株具有大而宽叶子的植物。植物位于室内，靠近窗户，光线透过叶子，形成戏剧性的对比和阴影效果。叶子细节清晰，看起来有些枯萎或下垂。"
Ilford FP4 E.I. 64 **English Alt Text:** "A black and white photograph of a bicycle parked and secured to a metal bike rack. The bike is positioned at an angle, with the front wheel prominently displayed in the foreground. The word 'FOREVER' is visible on the frame of the bicycle. The background consists of a paved sidewalk and additional bike racks." **Chinese Alt Text:** "一张黑白照片，展示了一辆自行车停放并固定在金属自行车架上。自行车以一定角度摆放，前轮清晰地显示在前景中。自行车车架上可以看到“FOREVER”字样。背景是铺砌的人行道和更多的自行车架。"
Ilford FP4 E.I. 64 **English Alt Text:** "A black and white photograph of a staircase in what appears to be a subway or underground station. The stairs are equipped with a central handrail and are flanked by walls on either side. The lighting is artificial, casting shadows and highlighting the steps. The stairs lead upwards, suggesting an exit or an upper level." **Chinese Alt Text:** "一张黑白照片，展示了一个看起来像是地铁或地下站的楼梯。楼梯中央设有扶手，两侧有墙壁。灯光是人工的，投下阴影并突出了台阶。楼梯向上延伸，暗示出口或上一层。"

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@detondev@social.linux.pizza
2025-06-11 11:30:28

me and who

“Portrait of Cultivation,” 2009. By Lieko Shiga. Part of her series “Spiral Coast,” which began as she photographed the traditions of the coastal Kitakama community. Unfortunately, In 2011 a Tsunami buried the town, taking 60 lives and even Shiga’s photo studio, along with most of her photos. And so, Shiga continued her project by capturing the aftermath of the tsunami in the following years.
@arXiv_condmatmtrlsci_bot@mastoxiv.page
2025-06-12 09:23:21

Efficient broadband terahertz generation by above band-gap excitation of the pyroelectric ZnSnN2
T. S. Seifert, H. Hempel, O. G\"uckstock, R. Schneider, Q. Remy, A. Fioretti, T. Unold, S. Michaelis de Vasconcellos, R. Bratschitsch, R. Eichberger, K. D\"orr, A. Zakutayev, T. Kampfrath
arxiv.org/abs/2506.09528

Efficient broadband terahertz generation by above band-gap excitation of the pyroelectric ZnSnN2
Terahertz (THz) radiation is a powerful probe of low-energy excitations in all phases of matter. However, it remains a challenge to find materials that efficiently generate THz radiation in a broad range of frequencies following optical excitation. Here, we investigate a pyroelectric material, ZnSnN2, and find that above-band-gap excitation results in the efficient formation of an ultrafast photocurrent generating THz radiation. The resulting THz electric field spans a frequency range from belo…

@arXiv_eessIV_bot@mastoxiv.page
2025-06-10 17:13:39

This arxiv.org/abs/2505.12887 has been replaced.
initial toot: mastoxiv.page/@arXiv_ees…

RetinaLogos: Fine-Grained Synthesis of High-Resolution Retinal Images Through Captions
The scarcity of high-quality, labelled retinal imaging data, which presents a significant challenge in the development of machine learning models for ophthalmology, hinders progress in the field. To synthesise Colour Fundus Photographs (CFPs), existing methods primarily relying on predefined disease labels face significant limitations. However, current methods remain limited, thus failing to generate images for broader categories with diverse and fine-grained anatomical structures. To overcome …

@wvmierlo@zirk.us
2025-05-11 16:40:46

Adams Building, Nottingham, September 2023
#photography #ukphotographer #nottingham #monochrome

View from across the street at the front of a building; visible are iron railings and two lampposts flanking the stairs leading to the main entrance; heavy shadows.

Wim Van Mierlo | Photography
Observing the spaces around me, whether it is the landscape, the built environment, or simply the places that I inhabit; finding that rare quality of beauty in the mundane and the every-day; creating memories that words cannot express.

@leftsidestory@mstdn.social
2025-07-08 00:30:05

Urban Solitude III 🈳
城市孤独 III 🈳
📷 Pentax MX
🎞️Fujifilm Neopan SS, expired 1995
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

Fujifilm Neopan 100 SS (FF) **English:** A black and white photograph depicting a narrow alleyway with a brick-paved path. The alley is flanked by high walls on both sides, creating a sense of depth and leading the eye towards a door at the end. The shadows cast by the walls create a pattern of light and dark on the ground, adding texture to the scene. The door at the end of the alley is slightly ajar, with a ladder leaning against the wall nearby. **Chinese:** 一张黑白照片，描绘了一条狭窄的小巷，铺着砖块的小路。小巷两侧是…
Fujifilm Neopan 100 SS (FF) **English:** A black and white photograph showing a view through a slightly open door into a narrow alleyway. The door handle and hinge are visible on the left side of the image. The alleyway is paved with bricks and extends into the distance, with a few steps leading up to another level. The perspective gives a sense of depth and invites curiosity about what lies beyond. **Chinese:** 一张黑白照片，展示了通过一扇微开的门看到的狭窄小巷。门把手和铰链在图片的左侧可见。小巷铺着砖块，向远处延伸，几级台阶通向另一个高度。透视感给人一种深度感，并引发人…
Fujifilm Neopan 100 SS (FF) **English:** A black and white photograph of an entrance to a traditional building, featuring a decorative brick wall with a circular pattern near the top. The entrance is framed by brick walls, and the roof above shows some wear. The scene is slightly blurred, adding a sense of nostalgia and timelessness to the image. **Chinese:** 一张黑白照片，展示了一座传统建筑的入口，入口上方的砖墙上有一个圆形图案装饰。入口由砖墙围成，上方的屋顶显得有些破旧。场景略显模糊，为图片增添了一种怀旧和永恒的感觉。
Fujifilm Neopan 100 SS (FF) **English:** A black and white photograph capturing a string of traditional Chinese lanterns hanging from a wire. The lanterns are intricately designed and appear to be made of a translucent material. They are positioned in front of a building with a numbered plaque, and a security camera is visible on the right side of the image. The lanterns add a cultural and festive element to the scene. **Chinese:** 一张黑白照片，拍摄了一串悬挂在电线上的中国传统灯笼。灯笼设计精美，看起来是由半透明材料制成。它们位于一栋带有编号牌匾的建筑…

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@arXiv_hepth_bot@mastoxiv.page
2025-06-09 09:04:12

Tidal Disruption in Topological Solitons and the Emergence of an Effective Horizon
Pierre Heidmann, Gela Patashuri
arxiv.org/abs/2506.05463

Tidal Disruption in Topological Solitons and the Emergence of an Effective Horizon
We compute the dynamics of particles and strings falling into smooth horizonless spacetimes that match the Schwarzschild black hole but replace its horizon with a smooth cap in supergravity. The cap consists of a regular topological structure formed by the deformations of extra compact dimensions. We show that infalling particles follow Schwarzschild-like trajectories down to the cap, but experience rapidly growing tidal forces that reach extreme values. In addition, infalling strings encounter…

@arXiv_condmatmtrlsci_bot@mastoxiv.page
2025-07-02 09:10:49

Femtosecond photocurrents by the Dresselhaus bulk spin-galvanic effect in an inversion-asymmetric ferromagnet
Junwei Tong, Zdenek Kaspar, Afnan Alostaz, Reza Rouzegar, Chihun In, Tim Titze, Maximilian Staabs, Genaro Bierhance, Yanzhao Wu, Holger Grisk, Jakob Walowski, Markus M\"unzenberg, Felicitas Gerhard, Johannes Kleinlein, Tobias Kie{\ss}ling, Charles Gould, Laurens W. Molenkamp, Xianmin Zhang, Daniel Steil, Tom S. Seifert, Tobias Kampfrath

Femtosecond photocurrents by the Dresselhaus bulk spin-galvanic effect in an inversion-asymmetric ferromagnet
We study ultrafast photocurrents in thin films of a model ferromagnetic metal with broken bulk inversion symmetry, the half-metallic Heusler compound NiMnSb, following excitation with an optical pump pulse with photon energy 1.55 eV. Remarkably, in terms of the direction of the sample magnetization M, all photocurrents are found to be a superposition of a component with Rashba- and Dresselhaus-type symmetry. We explain the Dresselhaus bulk photocurrent as follows: Pump-induced electron heating …

@arXiv_condmatmtrlsci_bot@mastoxiv.page
2025-06-23 11:28:20

Role of hydrogen dynamics and deposition conditions in photochromic YHO/MoO$_3$ bilayer films
Edvards Strods, Martins Zubkins, Viktors Vibornijs, Dmitrii Moldarev, Anatolijs Sarakovskis, Karlis Kundzins, Emija Letko, Daniel Primetzhofer, Juris Purans
arxiv.org/abs/2506.16946

Role of hydrogen dynamics and deposition conditions in photochromic YHO/MoO$_3$ bilayer films
Oxygen-containing yttrium hydride (YHO) and molybdenum trioxide (MoO$_3$) bilayer films (YHO/MoO$_3$) are produced using reactive magnetron sputtering, and their photochromic properties are investigated in relation to the thickness and density of the MoO$_3$ layer. Compared to single YHO films, the YHO/MoO$_3$ films exhibit faster coloration and larger contrast, with both parameters adjustable by varying the thickness or deposition pressure of the MoO$_3$ layer. Transparent YHO/MoO$_3$ films (~…