中国天眼给力!重复快速射电暴的“身份证”找到了
“基于中国天眼等多项数据,我们首次提出了一种描述快速射电暴周边环境复杂程度的方法,即‘RM弥散度’,这种方法能够解释重复快速射电暴偏振频率演化,示踪快速射电暴的身份信息,为最终确定快速射电暴起源提供了关键观测证据。
哈佛大学 Sham Kakade 硬核万字演讲:LLM 预训练,二次模型该站 C 位| ICML 2026
当大模型预训练还在靠一堆“炼丹术”般的启发式规则苦苦调参时,哈佛大学计算机科学系 Gordon McKay 教授 、Kempner 研究所联合主任 Sham Kakade 抛出了一项反直觉的研究:一个简单到离谱的二次模型,就能精准预测大语言模型在动态预训练中的绝大部分优化效果。
小宇分享(六十七)
分享兴趣,传播快乐,增长见闻,留下美好!亲爱的您,这里是LearningYard新学苑。
万字观止:别让RAG“失真”——“语料质量”方是企业级知识库落地的通关钥匙
从客服机器人到智能问答助手,从合规审查到业务支持,RAG系统正在重塑企业知识流动的方式。但成百上千企业部署经验表明,如果知识库中充斥着过时文档、冲突政策或格式混乱的表格等噪声数据,即使是最先进的GPT系列或 Gemini系列模型,也只能自信地生成错误的答案。
网球技术传播悖论⑤为什么大多数人永远无法理解节奏感与力量共振
网球技术传播悖论⑤:为什么大多数人永远无法理解“节奏感与力量共振”的秘密——网球技术的隐性核心在前四篇中,我们已经系统地揭示了网球技术传播中存在的底层悖论:技术不是被教出来的,而是被身体通过自组织(self-organization)、神经适应(neural adaptation
南开校长和其他作者“现身”,逐一回应!质疑者再发声
曹雪涛和被质疑论文所涉及的相关作者针对不同的质疑作出解释。质疑者再发声:我想强调我无意指责任何人行为失当。请记住,很多重复也许只是“诚实的错误”。
中国天眼给力!重复快速射电暴的“身份证”找到了
“基于中国天眼等多项数据,我们首次提出了一种描述快速射电暴周边环境复杂程度的方法,即‘RM弥散度’,这种方法能够解释重复快速射电暴偏振频率演化,示踪快速射电暴的身份信息,为最终确定快速射电暴起源提供了关键观测证据。
《自然》(20220217出版)一周论文导读
In the widely accepted ‘unified model’ solution of the classification puzzle of active galactic nuclei, the orientation of a dusty accretion torus around the central black hole dominates their appearance. In ‘type-1’ systems, the bright nucleus is visible at the centre of a face-on torus. In ‘type-2’ systems the thick, nearly edge-on torus hides the central engine. Later studies suggested evolutionary effects and added dusty clumps and polar winds but left the basic picture intact. However, recent high-resolution images of the archetypal type-2 galaxy NGC 1068, suggested a more radical revision. The images displayed a ring-like emission feature that was proposed to be hot dust surrounding the black hole at the radius where the radiation from the central engine evaporates the dust. That ring is too thin and too far tilted from edge-on to hide the central engine, and ad hoc foreground extinction is needed to explain the type-2 classification. These images quickly generated reinterpretations of the dichotomy between types 1 and 2. Here we present new multi-band mid-infrared images of NGC 1068 that detail the dust temperature distribution and reaffirm the original model. Combined with radio data , our maps locate the central engine that is below the previously reported ring and obscured by a thick, nearly edge-on disk, as predicted by the unified model. We also identify emission from polar flows and absorbing dust that is mineralogically distinct from that towards the Milky Way centre.