Happy Valentine's Day

在意大利曼托瓦附近的一个新石器时代考古遗址中,发现了一对人类骨架,他们以永恒的拥抱姿势埋葬了5000到6000年之久。据该发掘团队负责人埃琳娜·门蒂介绍,这种双人合葬的情况极为罕见,更不用说是以拥抱的形式。初步判断这对情侣年轻时去世。

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Eternal embrace? Couple still hugging 5000 years on

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A pair of human skeletons lie in an eternal embrace at an Neolithic archaeological dig site near Mantova, Italy.

Archaeologists in Italy have dicovered a couple burried 5000 to 6000 years ago, hugging each other.

"It's an extraordinary case," said Elena Mentti, who led the team on their dig near the northern city of Mantova.

"There has not been a double burial found in the Neolithic period, much less two people hugging - and they really are hugging."

Menotti said she believed the two, almost certainly a man and a woman although that needs to be confirmed, died young because their teeth were mostly intact and not worn down.

"I must say that when we discovered it, we all because very excited. I've been doing this job for 25 years. I've done digs at Pompeii, all the famous sites," she told Reuters.

"But I've never been so moved because this is the discovery of something special."

A laboratory will now try to determine the couple's age at the time of death and how long they had been buried.

转载于:https://www.cnblogs.com/Buffett/archive/2007/02/21/653319.html

内容概要:该论文探讨了一种基于粒子群优化(PSO)的STAR-RIS辅助NOMA无线通信网络优化方法。STAR-RIS作为一种新型可重构智能表面,能同时反射和传输信号,与传统仅能反射的RIS不同。结合NOMA技术,STAR-RIS可以提升覆盖范围、用户容量和频谱效率。针对STAR-RIS元素众多导致获取完整信道状态信息(CSI)开销大的问题,作者提出一种在不依赖完整CSI的情况下,联合优化功率分配、基站波束成形以及STAR-RIS的传输和反射波束成形向量的方法,以最大化总可实现速率并确保每个用户的最低速率要求。仿真结果显示,该方案优于STAR-RIS辅助的OMA系统。 适合人群:具备一定无线通信理论基础、对智能反射面技术和非正交多址接入技术感兴趣的科研人员和工程师。 使用场景及目标:①适用于希望深入了解STAR-RIS与NOMA结合的研究者;②为解决无线通信中频谱资源紧张、提高系统性能提供新的思路和技术手段;③帮助理解PSO算法在无线通信优化问题中的应用。 其他说明:文中提供了详细的Python代码实现,涵盖系统参数设置、信道建模、速率计算、目标函数定义、约束条件设定、主优化函数设计及结果可视化等环节,便于读者理解和复现实验结果。此外,文章还对比了PSO与其他优化算法(如DDPG)的区别,强调了PSO在不需要显式CSI估计方面的优势。
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