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浙江金华探索立体物流网货物在山水间“被接力”,浙江金华探索立体物流网货物在山水间“被接力”_我的网站

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Schematic diagram of Milky Way Photo: Courtesy of Purple Mountain Observatory (PMO)
Chinese astronomers have discovered that the Milky Way is not a simple, smoothly warped disk, but contains widespread "wrinkle-like" structures resembling ripples on a water surface, providing new clues to understanding the galaxy's 3D structure and evolutionary history.
The discovery was made by a research team from the Purple Mountain Observatory (PMO) under the Chinese Academy of Sciences, using data from the "Milky Way Imaging Scroll Painting" (MWISP) survey. The findings were published online titled "Widespread corrugations superimposed on the Galactic warp in the outer CO disk" in the journal Nature Astronomy on August 7.
For decades, astronomers have known that the Milky Way's disk is not perfectly flat. Instead, its outer regions are slightly bent upward on one side and downward on the other - a structure known as a galactic warp.
However, the latest study shows that this large-scale bending is not the whole story. Smaller-scale vertical fluctuations are also embedded within the warped disk, creating a more complicated 3D structure.
"In many illustrations and in the public imagination, the Milky Way looks like a flat vinyl record," Sun Yan, associate researcher at PMO and the first author of the paper, told the Global Times on Tuesday. "In reality, the outer part of the Milky Way is more like a record that has been heated and deformed, with one side lifted and the other side lowered. That is the warp. On top of this large-scale deformation, there are additional smaller waves, which we call corrugations," Sun explained.
Using a more everyday analogy, Sun compared the Milky Way's structure to a sea surface. The warp is like a large swell that changes the overall height of the ocean, while corrugations are smaller waves superimposed on that swell.
"The two structures exist together. In our data analysis, we first removed the large-scale warp model, which allowed us to reveal the smaller wave-like patterns hidden underneath," Sun said.
The research focused on the Milky Way's outer gas disk rather than the more familiar stellar disk. According to Sun, cold molecular gas and stars provide two complementary ways to study the galaxy.
"Molecular gas is a sensitive probe for studying the vertical structure and dynamics of the galactic disk because it is concentrated near the disk plane and responds strongly to disturbances," she said.
Molecular gas is also the raw material for star formation, meaning its distribution is closely connected with the formation of young stars. The researchers traced this gas through carbon monoxide (CO) emission, which can penetrate regions obscured by interstellar dust and provide a different perspective from optical observations of stars.
The breakthrough was made possible by the MWISP survey, conducted using China's 13.7-meter millimeter-wave telescope.
"MWISP can be understood as giving the Milky Way a large-scale medical examination using millimeter-wave observations," Sun said.
Previous CO surveys were limited in sensitivity and coverage, making it difficult to accurately study the distant outer regions of the galaxy. In contrast, the latest study identified more than 30,000 molecular cloud samples, covering about half of the Milky Way's outer disk and extending to a distance of about 26 kiloparsecs from the Galactic center.
With such a large dataset, researchers were able to first establish a model of the overall warp and then separate subtle structures from the background. The newly identified corrugations have radial wavelengths of about 3.9-7.9 kiloparsecs and vertical amplitudes of about 100-200 parsecs.
The study also identified a corrugation structure extending about 40 kiloparsecs in azimuth at a distance of around 12.7 kiloparsecs from the Galactic center. In some spiral arm regions, vertical displacements can reach approximately 200 parsecs.
The researchers believe these large-scale vertical fluctuations are likely related to "bending waves" triggered by external gravitational disturbances, suggesting that the Milky Way might have experienced more complex interactions during its evolutionary history.
Although the newly discovered structures sound dramatic, they do not have any direct impact on Earth or the solar system. "Humans cannot directly sense these corrugations," Sun said. "Their scales reach thousands or even tens of thousands of light-years, and even if these structures are evolving, such changes would not be directly perceptible on human timescales."
The study focuses on the outer disk of the Milky Way and does not include the region around the solar system. "There is currently no evidence that these structures have any observable influence on Earth's environment," Sun said.
Instead, their significance lies in what they reveal about the past. Like geological layers recording Earth's history, these galactic structures preserve traces of the Milky Way's evolutionary journey, the researchers explained.
Researchers said future studies combining more precise motion measurements and numerical simulations could further reveal the origins of these structures and their role in the long-term evolution of the Milky Way.
。　　金华8月21日电题：浙江金华探索立体物流网货物在山水间“被接力”　　作者董易鑫盛游　　清晨，位于浙江金华的横店高铁站热闹起来。一批货物从轨道交通站点运到这里后，被装入高铁快运车厢。随着列车驶离站台，这批货物将一路向西，当日抵达数百公里外的西安。

B | 　　这批货物走的，是一条“轨道+高铁”的物流通道。　　据悉，金义东市域轨道交通贯穿金华、义乌、东阳，在平峰时段存在一定富余运力。为此，当地尝试将物流运输“搬”上轨道：货物先搭乘市域轨道交通抵达横店高铁站，再接续高铁，运往更远的城市。

C | 　　这也是长三角首个采用“轨道+高铁”合营模式的中铁快运营业部。借助高铁早班车优势，货物可实现“夜间集货、清晨发车、当日达外省”。8月11日，快运包裹搭载G2026次高铁列车从横店高铁站驶出，于当日16时左右到达西安北站。傅俊摄　　对金华而言，这并不是简单增加一种运输方式，而是让原本各自运行的轨道交通与高铁“接上了头”。近年来，当地进一步把无人机、轨道交通、高铁等运输方式串联起来，根据运输距离和时效需求，让货物在山水间“被接力”。　　例如，在当地推出了“金轨天翼行”物流专线，鲜果可从当地华东水果市场出发，由无人机送往轨道节点，随后搭乘轨道交通，经无人配送车完成最后一段配送。数据显示，该线路单批次运输成本较过去降低35%。　　基于此，该市兰溪的杨梅等鲜果通过无人机运输，减少了中转环节；磐安偏远山区老人因无人机配送，获得更便捷的助餐服务；婺城区琅琊镇的无人机航线覆盖18个行政村，山区居民问诊、取药的时间从过去的两天缩短至两小时。　　截至目前，金华累计建成各类低空起降场(点)380余处，获批低空物流航线27条。

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