2022-06-24
封面插畫描繪的是人類活動導(dǎo)致了全球氣候變暖,并且限制了我們減緩這一進(jìn)程的選擇。盡管我們無法使其恢復(fù)如初,但仍有一些途徑可以避免災(zāi)難性的氣候變化并減少其影響。我們必須立即行動起來,大幅減少溫室氣體排放,改變我們種植糧食、消費(fèi)產(chǎn)品及管理生態(tài)系統(tǒng)的方法,從而避免毀滅性的未來。
Humanity’s actions have committed us to a warming climate and limited our options for mitigation. Although there is no turning back, some paths are still open to avoid catastrophic climate change and reduce its impacts. We must act now to drastically reduce greenhouse gas emissions and change our approaches to growing food, consuming products , ?and managing ecosystems to avoid a dire future.
2022-07-01
封面圖展示的是在2022年1月14日,湯加洪加火山噴發(fā)出的火山灰和氣體柱。全球地球物理觀測數(shù)據(jù)顯示,1月15日的高潮噴發(fā)產(chǎn)生了大范圍的大氣波動,其壓力波振幅可與1883年喀拉喀托火山爆發(fā)相媲美。當(dāng)猛烈的大氣波動在全世界的海洋中擴(kuò)散時,會引發(fā)復(fù)雜且高速運(yùn)動的海嘯。
An ash and gas plume rises from Hunga volcano, Tonga, on 14 January 2022. Global geophysical observations reveal that the climactic eruption that followed on 15 January produced a broad range of atmospheric waves, with pressure wave amplitudes comparable with those from the 1883 Krakatau eruption. While propagating over the world’s oceans, the remarkable atmospheric waves generated complex fast-traveling tsunamis.
2022-07-08
封面圖展示的是一種名為蒙塔涅蜜環(huán)菌的產(chǎn)孢蘑菇,它生長在智利并且以樹為食。研究人員對全球土壤真菌的多樣性和分布知之甚少。為了填補(bǔ)這一空白,一個新的非營利組織正在資助一個全球范圍內(nèi)的地表下偵查網(wǎng)絡(luò)。
The ?s p o r e - p r o d u cing mushroom of Armillaria montagnei feeds ?on a tree in ?Chile . Researchers know little about the global diversity and distribution of soil fungi . To help fill that gap, a new nonprofit is funding a global network of subterranean sleuths.
2022-07-15
封面圖展示的是來自 一個掃描探針顯微鏡尖端 的電壓脈沖,誘導(dǎo)具有選 擇性和可逆性的單分子化 學(xué)反應(yīng)。浪涌極性和電壓 脈沖的幅度會選擇不同的 結(jié)構(gòu)異構(gòu)體(在這里區(qū)分 為不同深淺的紅色、橙色 和黃色)。這些發(fā)現(xiàn)促進(jìn) 了我們對尖端誘導(dǎo)化學(xué)反 應(yīng)和一般還原氧化反應(yīng)的 理解。
Voltagepulses from the tip of a scanning probe microscope induce singlemolecule chemical reactions with selec tivi ty and rever sibili ty . Different constitutional isomers (distinguished here in shades o f red, orange, and yellow ) are selec ted by the polari ty and magnitude of the voltage pulse. The findings advance the understanding o f tip-induced chemistry and reduction-oxidation reactions in general.
(陶 陶?編譯)