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@leftsidestory@mstdn.social
2026-08-03 00:30:02

City Lives III 🔃
城市人生 III 🔃
📷 Pentax 6x7
🎞️ LUCKY SHD 400 (6x7)
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Wise

Lucky LUCKY SHD 100 (6x7) English A black-and-white photograph of a person sitting on a wooden bench, facing away from the camera. The person wears a cap and a shoulder bag. In front of them is a signboard with Chinese characters and additional smaller text below. The scene is set in a park-like environment with trees casting dappled shadows on the ground. 中文 一张黑白照片，展示一个背对镜头坐在木椅上的人。该人戴着帽子，背着一个肩包。他们面前有一个标志牌，上面写着模糊的中文字以及下方的小字。场景设定在一个公园般的环境中，树木在地面上投射出斑驳的阴影。
Lucky LUCKY SHD 100 (6x7) English A black-and-white photograph of a traditional courtyard. The scene features a closed wooden door with two vertical decorative panels on either side, each adorned with circular designs. The door is set within a brick wall, with a tiled floor leading up to it. To the right, there is a stone pedestal and a large, cylindrical stone carving with intricate patterns. Sunlight casts sharp shadows, illuminating parts of the courtyard and creating a contrast between lig…
Lucky LUCKY SHD 100 (6x7) English A black-and-white close-up of a traditional building corner. The image captures intricate carvings on the eaves and the corner of the roof. The carvings feature detailed, swirling patterns, showcasing craftsmanship. The wall is made of large stone bricks, and the tiled roof extends outward, creating a sense of depth and texture. 中文 一张黑白特写照片，展示了传统建筑的屋檐转角。图像捕捉到屋檐和屋顶转角处精美的雕工，呈现出细腻的卷曲图案，展现了工艺的精湛。墙体由大块石砖砌成，瓦片屋顶向外延伸，营造出深度和质感。
Lucky LUCKY SHD 100 (6x7) English A black-and-white photograph of a half covered walkway on the right side. The wall casts long, dramatic shadows on the ground, creating a rhythmic pattern of light and dark stripes. The walkway extends into the distance, with sunlight filtering through the trees, adding a dappled effect to the scene. 中文 一张黑白照片，展示了一个有一些遮蔽的走廊，右侧在地面上投射出长长的、戏剧性的阴影，形成明暗相间的节奏图案。走廊向远处延伸，阳光透过树木的缝隙，为场景增添了斑驳的光影效果。
@harrysentonbury@social.linux.pizza
2026-07-31 23:38:48

may as well spam more snaps from the church before bed.
goodnight.
#church #grave #tombScrolling

a couple of corbels carrying the arches with grim and glum looking carved faces on perpendicular church walls. the church is at least 12th or 13th century. some parts possibly older.
an ivy surrounded, leaning slate gravestone in the churchyard behind a spiders web in the foreground full of feathery thistle seeds.
a Victorian cast iron radiator with iron pipework in a dark corner of the church under a low arched alcove
a tombstone i spotted on the floor of the church. most of the inscription is mostly worn away. it bears a carving of a heart ♡ with two arrows shot through in an X shape. And a date "-3 1716" beauty and sadness.
@arXiv_physicsmedph_bot@mastoxiv.page
2026-07-21 08:06:46

Review of oxygen measurement and relevance to the mechanisms of FLASH radiotherapy
Brian W. Pogue, David I. Hunter, Corbin Narita, William S. Thomas, Xu Cao, Harold M. Swartz
arxiv.org/abs/2607.17974 arxiv.org/pdf/2607.17974 arxiv.org/html/2607.17974
arXiv:2607.17974v1 Announce Type: new
Abstract: FLASH radiotherapy (FLASH-RT) is the phenomenon of relative sparing of normal tissue when ultra-high dose rates (UHDR) are used compared with conventional dose rates (CDR) as clinically used. Despite extensive investigation, the underlying mechanisms remain unexplained. Among the proposed hypotheses, tissue oxygen has consistently been a central theme because oxygen is the most dominant factor known to modulate radiation-induced damage. The factors implicated in FLASH sparing include the baseline partial pressure of oxygen (pO2), transient radiolytic oxygen consumption (ROC), and oxygen-dependent changes in the chemistry of reactive oxygen species (ROS) that vary with dose rate. This review synthesizes current evidence on in vivo oxygen measurement techniques, highlighting their capabilities and limitations in capturing the spatial and temporal heterogeneity of tissue oxygenation. Key experimental studies in skin are summarized and interpreted by modulating oxygen levels via changes in inspired oxygen gas and vascular clamping interventions, demonstrating that the FLASH effect occurs only at intermediate baseline pO2 (normoxic or slightly hypoxic) values, but not at hypoxia or hyperoxia. Direct measurement of oxygen consumption during UHDR irradiation is possible, providing one of the first in situ measurements of radiation chemistry in patients. In parallel, recent advances in fast in vitro radiation chemistry assays indicate that UHDR irradiation alters radical yields, favoring increased production of solvated electrons and reduced hydroxyl radical mediated damage. Taken together, the available data suggest that the FLASH sparing effect arises from an interplay among the delivered dose and dose rate, local oxygen availability, and radiation chemistry, with tissue-specific variation in scavenging, leading to altered biological responses across the CDR-to-UHDR shift.
toXiv_bot_toot