2023-11-10
產(chǎn)生強超短光脈沖的鎖模激光器一直是超快科學(xué)技術(shù)的支柱。然而,迄今為止,它們?nèi)匀惑w積龐大,并且與芯片級納米光子學(xué)集成具有挑戰(zhàn)性。研究人員現(xiàn)已在鈮酸鋰納米光子平臺中開發(fā)出一種緊湊型鎖模激光器,促進了超快技術(shù)的小型化和芯片級超快納米光子電路的開發(fā)進程。
M o d e - l o c k e d l a s e r sgenerating intense ultrashortpulses of light have been thebackbone of ultrafast sciencesand te chnologie s. Howeve r,t h e y h a v e s o f a r r e m a i n e db u l k y a n d c h a l l e n g i n g t oi n t e g r a t e w i t h c h i p - s c a l en a n o p h o t o n i c s . R e s e a r c h e r shave now developed a compactmode-locked laser in a lithiumniobate nanophotonic platform,facilitating the miniaturizationof ultrafast technologies andthe development of chip-scaleultrafast nanophotonic circuits.
2023-11-17
封面照片展示的是在印度巴爾斯瓦垃圾填埋場的一場大火中回收材料的一個人的身影,它象征著固體廢物管理不善所面臨的挑戰(zhàn)。隨著氣溫接近巴黎協(xié)定限制并危及到全球甲烷承諾目標(biāo),相關(guān)應(yīng)對行動迫在眉睫。解決方案需要技術(shù)和行為實踐的重大轉(zhuǎn)變,以防止即將發(fā)生的環(huán)境災(zāi)難和不可持續(xù)的資源利用。
A p e r s o n r e c o v e r i n gmaterials amid a massive fire atthe Bhalswa landfill site in Indiasymbolizes the challenges of solidwaste mismanagement. Urgentaction is vital as temperaturesapproach the Paris Agreementlimit and jeopardize the GlobalMethane Pledge goal. Solutionsdemand a critical shift in technicaland behavioral practices to preventa n i m p e n d i n g e n v i r o n m e n t a lcatastrophe and unsustainable useof resources.
2023-11-24
白云石是一種重要礦物,產(chǎn)自令人驚嘆的地質(zhì)構(gòu)造中,例如意大利德雷辛寧山脈(如封面圖中所示)、尼亞加拉瀑布和石林等。盡管天然儲量豐富,但此前科學(xué)家一直未能在實驗室中培育出白云石——這一矛盾被稱為“白云石問題”。然而新的研究表明,與人們的常識相反,白云石需要溶解才能激活其生長。這些發(fā)現(xiàn)為制造缺陷更少的材料提供了基礎(chǔ)見解。
Dolomite is a key mineralin stunning geological formations,such as Tre Cime di Lavaredo (alsocalled Drei Zinnen; shown here),Niagara Falls, and Hoodoos.Despite its natural abundance,laboratory growth of dolomite hasproven impossible—a contradictionk n o w n a s t h e “ d o l o m i t eproblem.” New research unveilsthat, counterintuitively, dolomiterequires dissolution to activateits growth. These revelationsoffer foundational insights tomanufacture materials with fewerdefects.
2023-12-01
封面圖展示的是一只帽帶企鵝正在照顧一只小企鵝,而它的伴侶則在小憩。在南極洲喧囂的企鵝群中成功繁殖出后代的企鵝們,通過數(shù)千秒長的微睡眠獲得了總長超過11 個小時的睡眠,這種適應(yīng)性使它們能夠警惕捕食者和好斗的鄰居。研究結(jié)果表明,微睡眠能夠?qū)崿F(xiàn)一些睡眠功能。
A c h i n s t r a p p e n g u i n(Pygoscelis antarcticus ) cares for achick while its partner catches aquick nap. Penguins successfullybreeding in the hustle and bustleof a colony in Antarctica obtainmore than 11 hours of sleepthrough thousands of secondslongmicrosleeps—an adaptiont h a t e n a b l e s t h e m t o w a t c hf o r p r e d a t o r s a n d a g g r e s s i v eneighbors. The findings suggestthat microsleeps can fulfill somesleep functions.
(陶陶 編譯)