天地争霸美猴王

美国国家海洋和大气管理局(NOAA)下属的空间天气预测中心(SWPC)报告观察到“极端”级别的G5状况，并已向关键基础设施运营者发出警示。         A drone made of bamboo-based composite materials is seen in flight. Photo: official WeChat account of Long BambooA Chinese team has developed a drone using bamboo-based composite materials after making a breakthrough in a technique that allows bamboo to be flattened while preserving its tough outer layer. The drone has completed multiple test flights, China Central Television (CCTV) News reported.
Long Bamboo, a company based in East China's Fujian Province, developed the technique that preserves the bamboo's tough outer layer and allows different parts with different densities of the material to be used according to their properties, improving its overall performance.
In the past, the outer skin of bamboo was often treated as leftover material and eventually burned into low-value bamboo charcoal.
According to a company release in February, bamboo-based composites now make up more than 25 percent of the entire drone, while its fuselage skin is made entirely from the company's own high-performance bamboo composite material.
The bamboo-based material also offers a major cost advantage, costing only about one-quarter to one-tenth as much as aviation-grade carbon fiber. After the drone is retired, the material can naturally degrade, allowing it to effectively "come from nature and return to nature."
The team spent four years building data models, upgrading equipment and refining the material. The resulting drone has a wingspan of more than 2.5 meters but weighs only about 7 kilograms, and has already completed multiple test flights, according to CCTV News.
Bamboo was traditionally used mainly in products such as tableware and furniture. Now, however, the material is finding its way into a wider range of industrial applications. Bamboo fiber is being used in automobile interiors, while bamboo-based materials are also being explored as possible substitutes for plastics, glass fiber and carbon fiber in some applications. 
China has the world's largest bamboo resource base, with about 7.56 million hectares of bamboo forests nationwide. The country also ranks among the world leaders in bamboo resources, bamboo cultivation technologies and the development and utilization of bamboo materials, per CCTV News.
Global Times 
。

一场剧烈的地磁风暴正席卷地球，预警称电力及通信网络可能出现故障。NOAA的SWPC自2005年以来首次发布G4级别严重的地磁风暴警报，标志着空间天气事件的重大升级。

此次警报源于太阳活动的显著增强，包括近期频繁观测到的太阳黑子群及耀斑爆发。

引发此番空间天气事件的源头，是一个编号为NOM区域3664的巨大太阳黑子群，其体积达到地球直径的17倍之巨。这个磁性庞然大物已多次释放高强度太阳耀斑，引起太空气象学家的高度关注。

尽管可能遭遇服务中断，此前所未有的事件也为北美北部居民带来了一线奇观——绚丽的极光有望现身，其壮观景象或从阿拉巴马州延伸至加州北部，直至周末。

据SWPC网站报道，至少五起与上述耀斑相关的地球导向日冕物质抛射(CME)预计将于2024年5月10日中午抵达地球，并持续影响至5月12日。

“极端G5状况于美国东部时间下午5:54抵达地球，”SWPC指出，“地磁风暴可能延续至周末，因其他若干CME仍在穿越地球。”

日冕物质抛射本质上是太阳日冕中的等离子体及磁场爆发，当它们直接冲击地球时，构成严峻挑战。

SWPC进一步警告，预计该区域还将发生更多活跃事件。尽管潜在的干扰，这次独特事件却为北美北部的天空带来了观赏极光的绝佳机会，这一自然奇景预计将跨越广泛地域，从美国南部的阿拉巴马州一直延展至加州北部，直至周日期间。

专家警告，此次地磁风暴的影响范围广泛且深刻。

B | 电力系统面临广泛的电压调控难题，可能导致电网中断风险增加；航天器操作亦面临严峻考验，预期会出现表面充电、追踪困难及需紧急调整轨道的问题。

此外，感应电流可能干扰输油管道保护系统，高频无线电通讯可能变得不稳定，卫星导航功能预计将暂时降低，而低频无线电导航服务则可能完全中断数小时。