共查询到20条相似文献，搜索用时 31 毫秒
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The degradation of plastics has attracted much attention from the global community.Polyethylenes(PEs),as the most abundant synthetic plastics,are most frequently studied.PE is non-degradable and non-polar because of the sole presence of the pure hydrocarbon components.Concurrent incorporation of both in-chain cleavable and functional groups into the PE chain is an effective pathway to overcome the non-degradable and non-polar issue;however,the method for achieving this pathway remains elusive.He... 相似文献
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Nico Eisenhauer Gerrit Angst Ana E.B.Asato Rémy Beugnon Elisabeth B?nisch Simone Cesarz Peter Dietrich Stephanie D.Jurburg Anna-Maria Madaj Rine C.Reuben Christian Ristok Marie Sünnemann Huimin Yi Carlos A.Guerra Jes Hines 《国家科学评论(英文版)》2023,(7):251-260
Ever-growing human population and nutritional demands,supply chain disruptions,and advancing climate change have led to the re alization that changes in diversity and system performance are intimately linked.Moreover,diversity and system performance depend on heterogeneity.Mitigating changes in system performance and promoting sustainable living conditions requires transformative decisions.Here,we introduce the heterogeneity-diversity-system performance(HDP) nexus as the conceptual basis upon wh... 相似文献
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Robotized intelligent manufacturing is a growing trend in the manufacturing of large and complex components in aviation,aerospace,marine engineering and other industries.With their expansive workspaces and flexible deployment,climbing manufacturing robots can create a revolutionary manufacturing paradigm for large and complex components.This paper defines the climbing manufacturing robot based on the application status of climbing robots and then analyzes four key technical re quirements:adhesio... 相似文献
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Zijian Qin Chao Qian Lian Shen Xiaoping Wang Ido Kaminer Hongsheng Chen Huaping Wang 《国家科学评论(英文版)》2023,(7):91-97
Inspired by the concept of superscattering in optics,we for the first time theoretically predict and experimentally demonstrate the superscattering phenomenon in water waves.The subwavelength superscatterer is constructed by multi-layered concentric cylinders with an inhomogeneous depth profile.The superscatterer breaks the long-held single-channel scattering limit by several times and thus significantly enhances the total scattering strength.The underlying mechanism originates from the near deg... 相似文献
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Yugang Wang 《国家科学评论(英文版)》2024,(1):72-73
<正>Protein ion channels on a cell membrane generate action potentials for cellular signal transduction, and regulate biological activities during life. Since the discovery of the asymmetric ion transport phenomenon in quartz nanopipettes by Bard and colleagues [1], synthetic nanofluidic materials and devices have attracted a lot of research interests from the scientific community, 相似文献
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<正>PROBLEM In recent years,the rapid development of artificial intelligence (AI) technology,especially machine learning and deep learning, is profoundly changing human production and lifestyle.In various fields,such as robotics,face recognition,autonomous driving and healthcare,AI is playing an important role.However,although AI is promoting the technological revolution and industrial progress,its security risks are often overlooked.Previous studies have found that the wellperforming deep ... 相似文献
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Gregory J.Retallack 《国家科学评论(英文版)》2024,(1):10-12
<正>A strong motivation for studying mass extinctions is understanding how current climatic and biodiversity crises will affect creatures living on land such as ourselves. Perhaps the question is: how bad can it get? In that case, terrestrial Permian-Triassic mass extinctions are an irresistible worst-case scenario [1]. 相似文献
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Natalia M.Litchinitser 《国家科学评论(英文版)》2024,(1):71-72
<正>Non-linear optics is a branch of optics that studies the intriguing and sometimes unexpected ways in which light and matter interact at high intensities, when the polarization density does not respond linearly to the electric field of the light. The pursuit of the perfect non-linear optical material has been ongoing ever since the pioneering experiment on second harmonic generation carried out by Franken in 1961 [1]. Indeed, 相似文献
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Cuiying Pei Jianfeng Zhang Qi Wang Yi Zhao Lingling Gao Chunsheng Gong Shangjie Tian Ruitao Luo Mingtao Li Wenge Yang Zhong-Yi Lu Hechang Lei Kai Liu Yanpeng Qi 《国家科学评论(英文版)》2023,(5):215-220
Since the discovery of superconductivity in MgB2(Tc～ 39 K),the search for superconductivity in related materials with similar structures or ingredients has never stopped.Although about 100 binary borides have been explored,only a few of them show superconductivity with relatively low Tc.In this work,we report the discovery of superconductivity up to 32 K,which is the highest Tc in transition-metal borides,in MoB2under pressure.The Tc 相似文献
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<正>Human beings are the most intelligent living beings on Earth.Creating reconstructions of missing human limbs that can be naturally integrated into the human body is a lofty ambition and faces challenges in neuroscience,information science,mechanical and electronic engineering,and many other disciplines.Based on the development history of robotic prosthetic hands over the past 70 years, 相似文献
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Peter Müller-Buschbaum 《国家科学评论(英文版)》2023,(5):105-106
<正>Since the big success of the Vanguard1 mission,being the first solar-powered satellite,the use of solar cells in space developed very rapidly.Today,conventional solar cell technologies for space are based on silicon and GaAs modules.If significantly higher power conversion efficiencies (PCEs) are required, 相似文献
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Theory regarding the causation of mass extinctions is in need of systematization, which is the focus of this contribution. Every mass extinction has both an ultimate cause, i.e. the trigger that leads to various climato-environmental changes, and one or more proximate cause(s), i.e. the specific climato-environmental changes that result in elevated biotic mortality. With regard to ultimate causes, strong cases can be made that bolide(i.e. meteor) impacts, large igneous province(LIP) eruptions an... 相似文献
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Facing the need for transdisciplinary research to promote ecological restoration that achieves both social and ecological benefits,research on past restoration efforts that have directly or indirectly contributed to regional or national sustainable development warrants reassessment.Using China as an example,in this review,we address three basic research questions that can be summarized as follows:ecological restoration—of what,for whom and to what purpose?Accordingly,a landscape pattern—ecosyste... 相似文献
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Higher-order exceptional points(HOEPs) with extraordinary responsivity are expected to exhibit a vastly improved performance in detection-related applications.However,over the past few years,such an approach has been questioned due to several potential drawbacks,including the stringent parameter re quirements,fundamental resolution limits and noise.Here,exploring the conse quence of nonlinear gain saturation in exceptional singularities of non-Hermitian systems,we offer a feasible scheme to over... 相似文献