Urban food systems need remedies due to the global rise of food insecurity. Aquaponics has emerged as a circular agricultural mode to shape edible cities and features multiple food-water-energy (FWE) nexus. Here we pr...Urban food systems need remedies due to the global rise of food insecurity. Aquaponics has emerged as a circular agricultural mode to shape edible cities and features multiple food-water-energy (FWE) nexus. Here we provide a generalizable methodology and framework to capture the FWE nexus flows of aquaponics systems within city jurisdiction. To test the framework in Beijing, China, we offer an evidence-based tradeoff analysis of urban rooftop aquaponics (RA) and ground aquaponics (GA) from a FWE nexus perspective. The results show that urban aquaponics performs well in terms of water effi-ciency, which saves 42%-44% of water consumption than traditional greenhouses (TG) during the on-farm stage, but generates 2.3-3.0 times higher energy consumption and 1.1-2.1 times more carbon emis-sions. “From farm to table” aquaponics helps decrease 14%-44% of the energy, water, and carbon impacts during the off-farm stage. With diversely optimized strategies for renewable electricity, fish food, infras-tructure materials, and recycling actions, urban aquaponics can hopefully reduce energy consumption and carbon emissions by 80%-85% in the on-farm stage. In addition to greenhouse agriculture, utilizing a total of 155 km2 of RA and GA potential areas could increase urban vegetable self-sufficiency by 15%, and avoid 82% of the energy, water, and carbon footprints during upstream food supply chains beyond cities. Our findings could provide policy insights for urban stakeholders to create edible landscapes by integrating RA and GA, and thus direct resilient and sustainable agricultural transformation.展开更多
Fullerenes are a collection of closed polycyclic polymers consisting exclusively of carbon atoms.Recent remarkable advancements in the fabrication of metal-fullerene nanocatalysts and polymeric fullerene layers have s...Fullerenes are a collection of closed polycyclic polymers consisting exclusively of carbon atoms.Recent remarkable advancements in the fabrication of metal-fullerene nanocatalysts and polymeric fullerene layers have significantly expanded the potential applications of fullerenes in various domains,including electrocatalysis,transistors,energy storage devices,and superconductors.Notably,the interior of fullerenes provides an optimal environment for stabilizing a diverse range of metal ions or clusters through electron transfer,resulting in the formation of a novel class of hybrid molecules referred to as endohedral metallofullerenes(EMFs).The utilization of advanced synthetic methodologies and the progress achieved in separation techniques have played a pivotal role in expanding the diversity of the encapsulated metal constituents,consequently leading to distinctive structural,electronic,and physicochemical properties of novel EMFs that surpass conventional ones.Intriguing phenomena,including regioselective dimerization between EMFs,direct metal-metal bonding,and non-classical cage preferences,have been unveiled,offering valuable insights into the coordination interactions between metallic species and carbon.Of particular importance,the recent achievements in the comprehensive characterization of EMFs based on transition metals and actinide metals have generated a particular interest in the exploration of new metal clusters possessing long-desired bonding features within the realm of coordination chemistry.These clusters exhibit a remarkable affinity for coordinating with non-metal atoms such as carbon,nitrogen,oxygen,and sulfur,thus making them highly intriguing subjects of systematic investigations focusing on their electronic structures and physicochemical properties,ultimately leading to a deeper comprehension of their unparalleled bonding characteristics.Moreover,the versatility conferred by the encapsulated species endows EMFs with multifunctional properties,thereby unveiling potential applications in various fields including biomedicine,single-molecule mag-nets,and electronic devices.展开更多
This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Ac...This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Acanthus ebracteatus.It further delves into the factors leading to its endangered status and proposes corresponding protection strategies.The mian reasons for the endangered of A.ebracteatus are as follows:illegal harvesting of whole plants,habitat destruction,reproductive obstacles,and competition or interference from invasive or noxious plant species.To address these threats,a series of conservation strategies are proposed.Firstly,in-depth research on the artificial propagation techniques of A.ebracteatus should be conducted to surmount reproductive barriers.Secondly,habitat restoration initiatives need to be carried out to create a suitable ecological setting.Thirdly,in-situ protections should be enhanced while the implementing ex-situ conservation measures.Meanwhile,continuous monitoring of A.ebracteatus seedlings should be conducted to strengthen subsequent management and conservation efforts.Finally,it is recommended to rationally explore and utilize the medicinal properties of A.ebracteatus.展开更多
The demand for in-situ detection of latent fingerprints(LFPs)in ways of high sensitivity,high selectivity,high contrast,low cost and user-friendly is still urgent.To overcome this challenge,a moisture-stable,red-emitt...The demand for in-situ detection of latent fingerprints(LFPs)in ways of high sensitivity,high selectivity,high contrast,low cost and user-friendly is still urgent.To overcome this challenge,a moisture-stable,red-emitting fluoride phosphor K_(3)AlF_(6):Mn^(4+)(KAF:Mn^(4+))with an organic hydrophobic skin was prepared.The phosphor has a uniform and superfine morphology with excellent luminescence properties.More importantly,this non-ultraviolet(UV)or non-near infrared(NIR)induced phosphor was proved to be an ideal fluorescent label for LFP imaging,which is both friendly for touch DNA analysis and compatible to forensic light sources.The well-defined ridge details with little background interference on various surfaces were presented by the oleic acid(OA)modified KAF:Mn^(4+)(KAF:Mn^(4+)-OA)phosphor in few seconds using the powder dusting method.To confirm the high selectivity of KAF:Mn^(4+)-OA for LFP imaging,an efficient quantitative evaluation method is proposed with the aid of ImageJ&Origin software.Due to the superiority of the Mn^(4+)-doped fluoride for the rapid imaging of LFPs in terms of lowcost,high compatibility and good availability,it is expected to be a promising candidate for forensic science as well as fluorescence imaging in other fields instead of rare earth luminescent materials.展开更多
基金supported by the National Natural Science Foun-dation of China(72174028 and 52225902)the Strategic Research and Consulting Project of Chinese Academy of Engineer-ing(2024-XZ-47).
文摘Urban food systems need remedies due to the global rise of food insecurity. Aquaponics has emerged as a circular agricultural mode to shape edible cities and features multiple food-water-energy (FWE) nexus. Here we provide a generalizable methodology and framework to capture the FWE nexus flows of aquaponics systems within city jurisdiction. To test the framework in Beijing, China, we offer an evidence-based tradeoff analysis of urban rooftop aquaponics (RA) and ground aquaponics (GA) from a FWE nexus perspective. The results show that urban aquaponics performs well in terms of water effi-ciency, which saves 42%-44% of water consumption than traditional greenhouses (TG) during the on-farm stage, but generates 2.3-3.0 times higher energy consumption and 1.1-2.1 times more carbon emis-sions. “From farm to table” aquaponics helps decrease 14%-44% of the energy, water, and carbon impacts during the off-farm stage. With diversely optimized strategies for renewable electricity, fish food, infras-tructure materials, and recycling actions, urban aquaponics can hopefully reduce energy consumption and carbon emissions by 80%-85% in the on-farm stage. In addition to greenhouse agriculture, utilizing a total of 155 km2 of RA and GA potential areas could increase urban vegetable self-sufficiency by 15%, and avoid 82% of the energy, water, and carbon footprints during upstream food supply chains beyond cities. Our findings could provide policy insights for urban stakeholders to create edible landscapes by integrating RA and GA, and thus direct resilient and sustainable agricultural transformation.
基金Financial support from National Natural Science Foundation of China(22201227,21925104,92261204)Qin Chuang Yuan Program of Shaan Xi Province(2021QCYRC4-37)is greatly acknowledged.L.Ethanks the Robert A.Welch Foundation(AH-0033)for an endowed chair and the U.S.NSF(CHE-1801317)for generous financial support。
文摘Fullerenes are a collection of closed polycyclic polymers consisting exclusively of carbon atoms.Recent remarkable advancements in the fabrication of metal-fullerene nanocatalysts and polymeric fullerene layers have significantly expanded the potential applications of fullerenes in various domains,including electrocatalysis,transistors,energy storage devices,and superconductors.Notably,the interior of fullerenes provides an optimal environment for stabilizing a diverse range of metal ions or clusters through electron transfer,resulting in the formation of a novel class of hybrid molecules referred to as endohedral metallofullerenes(EMFs).The utilization of advanced synthetic methodologies and the progress achieved in separation techniques have played a pivotal role in expanding the diversity of the encapsulated metal constituents,consequently leading to distinctive structural,electronic,and physicochemical properties of novel EMFs that surpass conventional ones.Intriguing phenomena,including regioselective dimerization between EMFs,direct metal-metal bonding,and non-classical cage preferences,have been unveiled,offering valuable insights into the coordination interactions between metallic species and carbon.Of particular importance,the recent achievements in the comprehensive characterization of EMFs based on transition metals and actinide metals have generated a particular interest in the exploration of new metal clusters possessing long-desired bonding features within the realm of coordination chemistry.These clusters exhibit a remarkable affinity for coordinating with non-metal atoms such as carbon,nitrogen,oxygen,and sulfur,thus making them highly intriguing subjects of systematic investigations focusing on their electronic structures and physicochemical properties,ultimately leading to a deeper comprehension of their unparalleled bonding characteristics.Moreover,the versatility conferred by the encapsulated species endows EMFs with multifunctional properties,thereby unveiling potential applications in various fields including biomedicine,single-molecule mag-nets,and electronic devices.
基金Supported by Special Innovation Projects for Regular Institutions of Higher Education in Guangdong Province(2023KTSCX071)Zhanjiang Science and Technology Bureau Project(2023A01018)Colonel-level Project(LY2207).
文摘This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Acanthus ebracteatus.It further delves into the factors leading to its endangered status and proposes corresponding protection strategies.The mian reasons for the endangered of A.ebracteatus are as follows:illegal harvesting of whole plants,habitat destruction,reproductive obstacles,and competition or interference from invasive or noxious plant species.To address these threats,a series of conservation strategies are proposed.Firstly,in-depth research on the artificial propagation techniques of A.ebracteatus should be conducted to surmount reproductive barriers.Secondly,habitat restoration initiatives need to be carried out to create a suitable ecological setting.Thirdly,in-situ protections should be enhanced while the implementing ex-situ conservation measures.Meanwhile,continuous monitoring of A.ebracteatus seedlings should be conducted to strengthen subsequent management and conservation efforts.Finally,it is recommended to rationally explore and utilize the medicinal properties of A.ebracteatus.
基金financially supported by the National Natural Science Foundation of China(51962005)China Scholarship Council(201908505044)+6 种基金the cultivation project of the State Key Laboratory of Green Development and High-value Utilization of Ionic Rare Earth Resources in Jiangxi Province(20194AFD44003)Natural Science Foundation of Jiangxi Province(20192BAB206010)Scientific and Technological Project of Chongqing Education Commission(KJZD-M202000301,KJZD-K201800301)Science and Technology Program of Ganzhou city[2017]179the Youth Jinggang Scholars Program in Jiangxi Province[2018]82Key Program of Southwest University of Political Science and Law(2018XZZD-07,2019XZXS-207)Postgraduate Innovation Special Fund Project of Jiangxi Province(YC2019-S294).
文摘The demand for in-situ detection of latent fingerprints(LFPs)in ways of high sensitivity,high selectivity,high contrast,low cost and user-friendly is still urgent.To overcome this challenge,a moisture-stable,red-emitting fluoride phosphor K_(3)AlF_(6):Mn^(4+)(KAF:Mn^(4+))with an organic hydrophobic skin was prepared.The phosphor has a uniform and superfine morphology with excellent luminescence properties.More importantly,this non-ultraviolet(UV)or non-near infrared(NIR)induced phosphor was proved to be an ideal fluorescent label for LFP imaging,which is both friendly for touch DNA analysis and compatible to forensic light sources.The well-defined ridge details with little background interference on various surfaces were presented by the oleic acid(OA)modified KAF:Mn^(4+)(KAF:Mn^(4+)-OA)phosphor in few seconds using the powder dusting method.To confirm the high selectivity of KAF:Mn^(4+)-OA for LFP imaging,an efficient quantitative evaluation method is proposed with the aid of ImageJ&Origin software.Due to the superiority of the Mn^(4+)-doped fluoride for the rapid imaging of LFPs in terms of lowcost,high compatibility and good availability,it is expected to be a promising candidate for forensic science as well as fluorescence imaging in other fields instead of rare earth luminescent materials.
