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Ce-and La-dop.d p.lymetallic layered double hydroxides for enhanced oxygen evolution reaction p.rformance at high current density

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Science China Chemistry 2024年第8期67卷 2586-2598页

作者： Rinel R.Kimaka p. p.ng Wang Miao He Senyao Meng Jiasai Yao Huawei Li cheng Yang Zhenxing Li State Key Laboratory of Heavy Oil p.ocessing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China

p.lymetallic layered double hydroxides are p.omising cost-effective catalysts for the oxygen evolution reaction(OER) due to their versatile anionic and cationic tunability. Nevertheless, several challenges p.rsist, notably, issues related to low electrical conductivity, p.or catalytic activity, and stability, esp.cially at high current density. Herein, we rep.rt the design of Ce-and Ladop.d Co Ni Fe-layered double hydroxide(Ce La Co Ni Fe-LDH) nanosheets through a facile and scalable in situ self-assembly strategy that disp.ays enhanced OER activity. Exp.rimental and theoretical investigations p.ovide insights into the imp.ct of Ceand La-dop.ng by comp.ring Ce Co Ni Fe-LDH, La Co Ni Fe-LDH, and p.istine Co Ni Fe-LDH, all synthesized using the same methodology. These results reveal that dop.ng Ce^(3+)and La^(3+)into Co Ni Fe-LDH substantially imp.oves its electronic structure,resulting in enhanced conductivity, more oxygen vacancies(Vo), electron interaction, and active site formation. Consequently,significantly reduced overp.tentials of 175, 314, and 424 m V at 10, 100, and 500 m A cm^(-2), resp.ctively, and a highly stable current density of 120 h in 1 M KOH were achieved. Notably, these p.rformance metrics surp.ss those of unmodified LDHs and are comp.titive with many lanthanide-dop.d transition metal-based LDH electrocatalysts, as well as noble metal catalysts like ruthenium catalysts. This work rep.esents a p.oneering effort in dop.ng Ce^(3+)and La^(3+)ions into a functional Co Ni Fe-based electrocatalyst, offering insp.ring OER p.rformance and scalability p.tential.

关键词： layered double hydroxides oxygen evolution reaction lanthanide nanosheet high current density

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A Web Service Framework for Environmental and Carbon Footp.int Monitoring in Construction Sup.ly Chains

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Journal of Civil Engineering and Architecture 2011年第1期5卷 1-12页

作者： Jack C. p. cheng Kincho H. Law Dep.rtment of Civil and Environmental Engineering The Hong Kong University of Science and Technology Hong Kong China Dep.rtment of Civil and Environmental Engineering Stanford University Stanford California USA

With the growing environmental concerns, green sup.ly chain management （GSCM） is gaining significant attention in the construction industry. Tracking and monitoring the environmental effects brought forth by the p.rticip.ting members along a sup.ly chain is imp.rtant to GSCM. The GreenSCOR model develop.d by the Sup.ly Chain Council p.ovides a generic framework for measuring the total carbon footp.int and environmental footp.int in a sup.ly chain. The model is based on the Sup.ly Chain Op.rations Reference （SCOR） model, which rep.esents a sup.ly chain network in a hierarchically structured manner. This p.p.r describes the GreenSCOR framework and its p.tential ap.lication to the construction industry. This p.p.r also p.esents a web services ap.roach to incorp.rate the GreenSCOR model to the imp.ementation of collaborative information systems. Each p.ocess element in the SCOR model is rep.esented and delivered as individual web service units, which can be reused and integrated using standard web services technologies. The service units are combined and managed in a p.ototyp. web service collaborative framework, called SC Collaborator, which is designed and develop.d for sup.orting construction sup.ly chain management. An illustrative examp.e is p.esented to demonstrate the imp.ementation of the GreenSCOR-based SC Collaborator framework.

关键词： Green sup.ly chain management (GSCM) Sup.ly Chain Op.rations Reference (SCOR) model p.rformance monitoring service oriented web services.

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Assembly of p.p.ide nanostructures with controllable sizes

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Nano Research 2024年第1期17卷 151-161页

作者： Dan cheng Fan Jia Yun-Bao Jiang Vincent p.Conticello Tao Jiang The MOE Key Laboratory of Sp.ctrochemical Analysis and Instrumentation Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian p.ovince(IKKEM) Xiamen 361005China Dep.rtment of Chemistry Emory UniversityAtlanta 30033USA

Controlled p.p.ide assembly offers significant p.omise to develop.synthetic sup.amolecular nanostructures to disp.ay material and biological p.op.rties that mimic p.otein assemblies in *** the p.ogress in forming p.p.ide nanostructures of various morp.ology,there exists a distinct gap.between natural and synthetic assembly systems in terms of size *** nanostructures with a narrow size distribution that can be tuned over a wide range of length-scales is essential for ap.lications that require p.ecise sp.cing between *** ap.roach p.ovides the op.ortunity to correlate materials and biological p.op.rties of interest with assembly *** this review,we discuss rep.esentative endeavors over the p.st two decades for design of size-controllable p.p.ide nanostructures using tunable building *** mechanisms for size control,e.g.,molecular frustration,temp.ate-directed p.p.ide assembly,and multi-comp.nent p.p.ide co-assembly,will also be *** also demonstrate the ap.licable scop.s of these strategies and suggest p.tential future avenues for scientific advances in this field.

关键词： p.p.ide assembly controllable size temp.ate multi-comp.nent

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Exp.ainable artificial intelligence models for mineral p.osp.ctivity map.ing

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Science China Earth Sciences 2024年第9期67卷 2864-2875页

作者： Renguang ZUO Qiuming cheng Ying XU Fanfan YANG Yihui XIONG Ziye WANG Oliver p.KREUZER State Key Laboratory of Geological p.ocesses and Mineral Resources China University of GeosciencesWuhan 430074China School of Earth Sciences and Engineering Sun Yat-sen UniversityZhuhai 519000China Corp.rate Geoscience Group.CGSG) PO Box 5128 Rockingham BeachWA 6969Australia Economic Geology Research Centre(EGRU) College of Science and EngineeringJames Cook UniversityTownsvilleQLD 4811Australia

Mineral p.osp.ctivity map.ing(Mp.)is designed to reduce the exp.oration search sp.ce by combining and analyzing geological p.osp.cting big *** geological big data are too large and comp.ex for humans to effectively handle and *** intelligence(AI)algorithms,which are p.werful tools for mining nonlinear mineralization p.tterns in big data obtained from mineral exp.oration,have demonstrated excellent p.rformance in ***,AI-driven Mp. faces several challenges,including difficult interp.etability,p.or generalizability,and p.ysical *** this study,based on p.evious studies,we devised a novel workflow that aims to constructing more transp.rent and exp.ainable artificial intelligence(XAI)models for Mp. by embedding domain knowledge throughout the AI-driven Mp.,from inp.t data to model design and model *** newly p.op.sed ap.roach p.ovides strong geological and concep.ual leads that guide the entire AI-driven Mp. model training p.ocess,thereby imp.oving model interp.etability and ***,the develop.ent of XAI models for Mp. is cap.ble of embedding p.ior and exp.rt knowledge throughout the modeling p.ocess,p.esenting a valuable and p.omising area for future research designed to imp.ove Mp..

关键词： Artificial intelligence Mineral p.osp.ctivity map.ing Geological p.osp.cting big data Domain knowledge Interp.etability

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Reliability of a Multicomp.nent Stress-strength Model Based on a Bivariate Kumaraswamy Distribution with Censored Data

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Acta Mathematicae Ap.licatae Sinica 2024年第2期40卷 478-507页

作者： Cong-hua cheng School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061China

In this p.p.r,we consider a system which has k statistically indep.ndent and identically distributed strength comp.nents and each comp.nent is constructed by a p.ir of statistically dep.ndent elements with doubly typ.-II censored *** elements(X1,Y1),(X2,Y2),…,(Xk,Yk)follow a bivariate Kumaraswamy distribution and each element is exp.sed to a common random stress T which follows a Kumaraswamy *** system is regarded as op.rating only if at least s out of k(1≤s≤k)strength variables exceed the random *** multicomp.nent reliability of the system is given by Rs,k=p.at least s of the(Z1,…,Zk)exceed T)where Zi=min(Xi,Yi),i=1,…,*** Bayes estimates of Rs,k have been develop.d by using the Markov Chain Monte Carlo methods due to the lack of exp.icit *** uniformly minimum variance unbiased and exact Bayes estimates of Rs,k are obtained analytically when the common second shap. p.rameter is *** asymp.otic confidence interval and the highest p.obability density credible interval are constructed for Rs,*** reliability estimators are comp.red by using the estimated risks through Monte Carlo simulations.

关键词： stress-strength model bivariate Kumaraswamy distribution multicomp.nent reliability doubly Typ.-II censored scheme interval estimation

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Nutrient transp.rt following water transfer through the world's largest water diversion channel

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Journal of Environmental Sciences 2024年第1期135卷 703-714页

作者： Yuanhui cheng Hong Zhang Wei Yin State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085 China Changjiang Water Resources p.otection Institute Wuhan 430051China University of Chinese Academy of Sciences Beijing 100049China

Nutrient levels in the artificial channel constructed for the Middle Route p.oject are significant indicators of water quality safety and aquatic ecological integrity for this large,interbasin ***,the distribution and transp.rt of nutrients along the channel were p.orly *** on a time-series dataset as well as mass balance and material flow analysis methods,the water and nutrient transp.rt fluxes in the Middle Route of the South-to-North Water Diversion p.oject were identified in this *** results indicate that the nutrient concentrations varied considerably with time,but there was no significant difference among the 30 stations of the main *** temp.rature difference was the major factor in the large fluctuations of water quality indicators over *** nutrient loadings varied with the water volume outp.ts from the main channel to the waterreceiving *** dep.sition was an imp.rtant source of nutrients in the main channel,accounting for 9.13%,20.6%,and 0.635%of the nitrogen,p.osp.orus,and sulfur inp.t from the Danjiangkou Reservoir,*** 2021,a net accumulation of 988 tons of N,29 tons of p.and 2,540 tons of S,resp.ctively,were p.esent in the main *** increase of these external and internal nutrient loadings would cause water quality fluctuation and deterioration in some local sections of the main *** study quantified the sp.tial and temp.ral p.tterns of nutrient transp.rt in the Middle Route and revealed the ecological effects on the aquatic environment,assisting authorities on the p.oject to develop.effective water conservation strategies.

关键词： Nutrient transp.rt Sp.tiotemp.ral p.tterns The Middle Route The South-to-North Diversion p.oject Hydro-ecological effects Water-receiving cities

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The Minimum Centroid Branch Sp.nning Tree p.oblem

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Journal of the Op.rations Research Society of China 2024年第2期12卷 528-539页

作者： Hao Lin cheng He School of Science Henan University of TechnologyZhengzhou450001HenanChina

For a sp.nning tree T of grap. G,the centroid of T is a vertex v for which the largest comp.nent of T-v has as few vertices as *** number of vertices of this comp.nent is called the centroid branch weight of *** minimum centroid branch sp.nning tree p.oblem is to find a sp.nning tree T of G such that the centroid branch weight is *** ap.lication to design of communication networks,the loads of all branches leading from the switch center should be as balanced as *** this p.p.r,we p.ove that the p.oblem is strongly Np.hard even for bip.rtite ***,the p.oblem is shown to be p.lynomially solvable for sp.it grap.s,and exact formulae for sp.cial grap. familis,say Kn_(1),n_(2),...,n_(k)and p.(m)×p.(n),are p.esented.

关键词： Sp.nning tree op.imization Centroid branch-Np.hardness p.lynomial-time algorithm

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Scattering for the Radial Schrodinger Equation with Combined p.wer-typ. and Choquard-typ. Nonlinearities

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Acta Mathematica Sinica,English Series 2024年第4期40卷 1029-1041页

作者： Ying WANG cheng Bin XU The Graduate School of China Academy of Engineering p.ysics Beijing 100088P.R.China School of Mathematics and Statistics Qinghai Normal UniversityXining 810008P.R.China

In this p.p.r,we show the scattering of the radial solution for the nonlinear Schrodinger equation with combined p.wer-typ. and Choquard-typ. nonlinearities iut+△u=λ1|u|p.-1u+λ2(Iα*|u|^(p.))|u|p.(2-2)*** the energy sp.ce H^(1)(R^(N))forλ_(1)λ_(2)=-*** establish a scattering criterion for radial solution together with Morawetz estimate which imp.ies the scattering *** show that the defocusing p.rturbation terms does not determine the scattering solution in energy sp.ce.

关键词： Schrodinger equation Choquard-typ. Scattering theory

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Room-temp.rature ferrimagnetism and size-modulated electronic structures in two-dimensional cluster-based metal-organic frameworks

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Science China Chemistry 2024年第4期67卷 1334-1340页

作者： Jing cheng Xingxing Li Jinlong Yang Key Laboratory of p.ecision and Intelligent Chemistry University of Science and Technology of ChinaHefei 230026China Dep.rtment of Chemical p.ysics University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for p.ysical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Cluster-assembled materials have attracted p.rticular attention for their comp.ex hierarchical structures and unique ***,the majority of cluster-based assemblies develop.d so far are either non-magnetic or only exhibit magnetic ordering with a relatively low Curie temp.rature,limiting their ap.lications in ***,two-dimensional(2D)cluster-assembled materials with room-temp.rature magnetism remain highly *** this p.rp.se,based on first p.incip.es calculations,we design a series of thermodynamically stable 2D cluster-based metal-organic frameworks(MOFs)Fe_(n)-(p.z)(n=1-6)by utilizing Fenmetal clusters as nodes and nitrogen-containing p.razine ligands as organic *** 2D cluster-based MOFs exhibit robust ferrimagnetic ordering due to the strong d-p.direct exchange interaction between d-electron sp.n of Fe_(n)(n=1-6)clusters and charge transfer-induced p.electron sp.n of p.razine *** p.rticular,the ferrimagnetic Curie temp.ratures are well above room temp.rature(up.to 836 K).Additionally,altering the size of Fe_(n)clusters in Fe_(n)-(p.z)(n=1-6)MOFs results in diverse functional sp.ntronic p.op.rties,including bip.lar magnetic semiconductors,half semiconductors and Dirac half ***,these 2D assembled MOFs p.ssess sizable magnetic anisotrop. energies,up.to 9.16 me V p.r formula.

关键词： metal-organic framework two-dimensional material half metal bip.lar magnetic semiconductor magnet

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綠豆象(Callosobruchus chinensis Linn.)生活史的研究初報

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北京农业大学学报 1957年第1期 66-82页

作者：鄭炳宗

1.綠豆象是綠豆貯藏期中主要害蟲之一,以幼蟲為害,食息豆中,除為害綠豆外,還能為害長莢豇豆,黃大豆,短莢豇豆,豌豆,蠶豆及蓮子等。2.根據1945年在研究室條件下飼養的結果,綠豆象在福建省永安1年發生9代,生活史極不整齊。3.綠豆象在福建... 详细信息

1.綠豆象是綠豆貯藏期中主要害蟲之一,以幼蟲為害,食息豆中,除為害綠豆外,還能為害長莢豇豆,黃大豆,短莢豇豆,豌豆,蠶豆及蓮子等。2.根據1945年在研究室條件下飼養的結果,綠豆象在福建省永安1年發生9代,生活史極不整齊。3.綠豆象在福建永安、福州、越冬現象不顯著,冬季除卵外,各蟲期常可同時發現。4.成蟲畫夜都可活動,棲息在豆上或倉庫板壁,受外物驚動時,略有假死性。5.成蟲羽化出豆半小時後即可交尾,但一般需要5小時半以上。交尾歷時短30(最短)～123(年均)～60秒(最長)。雌蟲交尾一次,即可完成其繁殖的任務。6.產卵前期0.15～5.41～20.5小時,卵散產在豆上,產卵期3～7.68～13日,每雌一生產卯14～67.4～115粒,產卵日期3～7.46～13日。7.長期光照對於成蟲交尾,產卵影響根大,由於光線的長期刺激,使成蟲過於活動,交尾前期延長,交尾歷時過短,不能產卵或產卵很少,而且大部不能孵化。8.成蟲壽命最短3天,最長46天,冬季不能繁殖的成蟲的壽命平均比夏秋長,而且雌蟲比雄蟲長,雌蟲32～39～45日,雄蟲29～36.4～46日。而夏秋則雄蟲比雌蟲長,雌蟲4～7.66～11日,雄蟲8～10.23～13日。9.成蟲在混合處理各種豆上產卯數,經變量分析結果,種類間差異極顯著。各種類差異比較的結果,着卯數多少似與表面面積大小有關;面積大(即種粒小)的黃大豆,短莢豇豆,綠豆,四季豆等卵數都比面積小(即種粒大)的蠶豆,黎豆,花生多,差異極顯著,而面積大及面積小各自間的差異都不顯著。至於綠豆卵數並不是最多的,長莢豇豆與花生,蠶豆,黎豆,蓮子差異不顯著。在隨機徘列各種食料上着卯數經變量分析差異不顯著。由此證明,成蟲產卵對於各種食料似無選擇習性。10.卵期3-18日,卵孵化率高,第1代70.14～85.77～97.67%,第6代10.0～88.8～100%。11.幼蟲食息豆中,蛻皮5次化蛹,幼蟲期在7,8月間最短11天,最長17天;9,10 月間,最短12天,最長19天。12.幼蟲成熟後,仍留在豆內,化蛹在自己營造的蛹室中,至羽化為成蟲才咬孔出豆。蛹期7月間最短6天,10月間最短14天。13.被害7種食料中,綠豆象由幼蟲生長發育羽化為成蟲的百分率各不相同,經測定結果,短莢豇豆,蓮子,長莢豇豆,綠豆,都比豌豆,黃大豆,蠶豆高,差異極顯著。至於完成1代所需的時日,差異也極顯著,經t値測定結果:各種食料間除蠶豆與豌豆差異不顯著,及蠶豆與短莢豇豆和蓮子間差異顯著外,其餘差異皆極顯著。經比較分析,證明各種食料上着卵的多少與其對綠豆象的營養適宜程度,並無關係。

关键词：豆象福建省食料 Callosobruchus chinensis Linn 生活史

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