第一阶段教学目标的无限延长：解构网球动作绝对主义与自适应表现
第一阶段教学目标的无限延长：解构网球动作绝对主义与自适应表现的异化断层在商业化大众网球教学领域commercial tennis training market中，存在着一个被整个行业默许、却极度扭曲的终极怪圈ultimate systemic anomaly：行业习惯于把“第一
具身智能的“双螺旋”，发生在空间里？
“ 导航和感知同时破局。在机器人领域有一个经典困境。让机器人在抽象层面“理解”指令相对容易，让它在物理世界“执行”动作也日趋成熟，但在开放、动态、非结构化的真实环境中把这两者无缝衔接起来，始终是横亘在实验室与产业化之间的巨大鸿沟。
网球飞行中的双重衰减：线速度、角速度与”击球点在前”教条
网球飞行中的双重衰减：线速度、角速度与”击球点在前”教条的物理学解构在网球从拍面弹出到落入对方半场的整个飞行轨迹中，球体同时承载着两种独立却相互纠缠的运动状态：平动 translational motion 所表征的线速度 linear velocity，与自转 spin mot
Nature Methods | 当Hi-C拥有“空间坐标”：Spatial Hi-C揭示大脑发育中的三维基因组图谱
引言我们已经越来越清楚：基因组并不是一条摊平在细胞核里的DNA长链。染色体会在细胞核中折叠、分区并形成远距离接触，这些三维结构与基因表达、DNA复制和损伤修复密切相关。
LLM多跳推理深度测试：四项指标精准定位模型的推理极限
模型的推理深度直接决定了它在多跳推理任务中能走多远、有多可靠。四项指标对 Qwen 3 和 Llama 3.2 在任务 B 上的深层推理能力做了全面评估。
马钦等：基于全向扫描选择性状态空间分割的家畜体尺自动测量方法
Abstract: Existing methods often struggle to accurately and automatically separate livestock from complex background environments and are further hindered by severe noise interference in point cloud data， which leads to insufficient segmentation accuracy and ultimately affects the precision of livestock body measurements. To address these challenges， this study proposes a livestock body measurement method based on omnidirectional spatial localization segmentation. First， an omnidirectional point cloud segmentation model was designed， which adopts an eight-directional scanning strategy in 3D space and an alternating dual-module architecture that integrates Point Mamba Blocks with convolutional modules. By enhancing spatial neighborhood modeling capabilities， the model efficiently fuses region-specific geometric features with comprehensive structural context， thereby achieving precise separation of livestock from background interference. Second， a spatial localization-based measurement method was developed. This method constructs a spatial coordinate system using ground normal vectors to achieve automatic rotation and alignment of the point cloud. It employs a two-step clustering strategy to identify key body parts， including the head and tail， and determines measurement landmarks through geometric point distribution analysis， enabling accurate， non-contact estimation of body size parameters. Experiments conducted on 20 pigs and 103 cattle demonstrate that the proposed model achieves outstanding segmentation performance， with mean Intersection over Union values of 0.9930 for pigs and 0.9685 for cattle. Furthermore， the model yields low mean absolute percentage errors in morphological measurements. For pigs， the MAPE for body width， hip width， and chest girth are 1.34%， 1.99%， and 1.37%， respectively. For cattle， the MAPE for body slant length， chest width， hip height， and heart girth are 2.24%， 3.28%， 2.18%， and 4.22%， respectively. These results indicate that the proposed method provides highly accurate segmentation and morphological measurement capabilities for both pigs and cattle.
现象学解剖：全球业余网球圈的静态自欺与双跳麻木现象
在一、现象学解剖：全球业余网球圈的静态自欺与双跳麻木现象phenomenological anatomy of static self deception and double bounce numbness in global amateur tennis在遍布全球的业余网球圈
每日一词 | 现代化首都都市圈空间协同规划 the spatial coordination plan for the modern capital metropolitan area
日前，中共中央、国务院关于《现代化首都都市圈空间协同规划（2023—2035年）》的批复发布。