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Revealing effect of Al content on oxidation of novel co-cr-Nb-W carbide-strengthened superalloy

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Rare Metals 2024年第9期43卷 4521-4534页

作者： chen Ling Shang-Ping Li Jie Hou he-Li Luo central Iron & Steel Research Institute Beijing GAONA Materials&Technology co. Ltd.

The high-temperature oxidation behavior of novel co-cr-Nb-W carbide-strengthened wear-resistance alloys with different Al contents（1wt%, 2wt% and 3wt%）at 950, 1000 and 1050 °c was thoroughly investigated by scanning electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy and field emission electron probe analyzer. The porous property of Nb c in-situ oxidation products（Nb2O5, co Nb2O6and co4Nb2O9） induces a multi-layered oxide scale with micropores and ***-cr-Nb-W alloy with 1 wt% Al undergoes catastrophic oxidation and spalling above 1000 °c. The outward transportation of cr and co is effectively restrained by a continuous Al2O3scale formed around Nb c in-situ oxidation region when Al content reaches 3 wt%. The β-co Al in co-cr-Nb-W alloy with 3 wt% Al has an oxidation priority over eutectic carbides and the alloy matrix which are both enriched with cr, thereby preventing the formation of cr-depletion area and improving the self-healing ability of the oxide film. A slight change in Al content has a remarkable influence on the cooperative effect of Al and cr and multiplies the antioxidant capacity of co-cr-Nb-W alloy above 1000 °c.

关键词： High-temperature oxidation behavior Microstructure Oxidation kinetics Superalloy Wear-resistant alloy

Highly Strong,Tough,and cryogenically Adaptive Hydrogel Ionic conductors via coordination Interactions

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Research 2024年第3期2024卷 703-713页

作者： Zhuomin Wang Siheng Wang Lei Zhang he Liu xu xu Institute of chemical Industry of Forestry Products Key Laboratory of Biomass Energy and MaterialJiangsu ProvinceKey Laboratory of Chemical Engineering of Forest ProductsNational Forestry and Grassland AdministrationNational Engineering Research Center of Low-Carbon Processing and Utilization of Forest BiomassJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesChinese Academy of ForestryNanjing 210042China college of chemical Engineering Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China.

Despite the promise of high flexibility and conformability of hydrogel ionic conductors,existing polymeric conductive hydrogels have long suffered from compromises in mechanical,electrical,and cryoadaptive properties due to monotonous functional improvement strategies,leading to lingering ***,we propose an all-in-one strategy for the preparation of poly(acrylic acid)/cellulose(PAA/cel)hydrogel ionic conductors in a facile yet effective manner combining acrylic acid and salt-dissolved cellulose,in which abundant zinc ions simultaneously form strong coordination interactions with the two polymers,while free solute salts contribute to ionic conductivity and bind water molecules to prevent ***,the developed PAA/cel hydrogel simultaneously achieved excellent mechanical,conductive,and cryogenically adaptive properties,with performances of 42.5 MPa for compressive strength,1.6 MPa for tensile strength,896.9%for stretchability,9.2 MJ m^(−3)for toughness,59.5 kJ m^(−2)for fracture energy,and 13.9 and 6.2 mS cm^(−1)for ionic conductivity at 25 and−70°c,*** by these features,the resultant hydrogel ionic conductor is further demonstrated to be assembled as a self-powered electronic skin(e-skin)with high signal-to-noise ratio for use in monitoring movement and physiological signals regardless of cold temperatures,with hinting that could go beyond high-performance hydrogel ionic conductors.

关键词： Highly freezing salts

A Fast Insertion Tabu Search with conflict-Avoidance heuristic for the Multisatellite Multimode crosslink Scheduling Problem

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Tsinghua Science and Technology 2024年第3期29卷 843-862页

作者： Weiyi Yang Lei he xiaolu Liu Weican Meng Yingwu chen college of Systems Engineering National University of Defense TechnologyChangsha 410000China Beijing Institude of Tranking and Telecommunication Technology Beijing 100000China

An agile earth-observing satellite equipped with multimode cameras capable of transmitting observation data to other satellites is developed to rapidly respond to requests with multiple observation *** gives rise to the Multisatellite Multimode crosslink Scheduling(MMcS)problem,which involves allocating observation requests to agile satellites,selecting appropriate timing and observation modes for the requests,and transmitting the data to the ground station via the satellite communication ***,a mixed integer programming model is introduced to include all complex time and operation *** solve the MMcS problem,a two-stage heuristic method,called Fast insertion Tabu Search with conflict-avoidance(FTS-c)heuristic,is *** the first stage,a conflict-avoidance insertion algorithm is designed to generate a high-quality initial solution by considering the requests transmission and ***,the tabu search-based second stage optimizes the initial ***,an extensive empirical study based on a real-world situation demonstrates that FTS-c can generate a solution with higher quality in less time than other state-of-the-art algorithms and the cPLEx solver.

关键词： earth observation satellites scheduling tabu search heuristic data transmission and download mixedinteger programming model

comparative evaluation of SPE methods for biotoxicity assessment of water and wastewater:Linkage between chemical extracting efficiency and biotoxicity outcome

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Journal of Environmental Sciences 2024年第8期142卷 33-42页

作者： Jiawei Zhou Shihao Wang xiwei he Hongqiang Ren xu-xiang Zhang State Key Laboratory of Pollution control and Resource Reuse School of EnvironmentNanjing UniversityNanjing 210023China

Biotoxicity assessment results of environmental waters largely depend on the sample extraction protocols that enrich pollutants to meet the effect-trigger thresholds of ***,more chemical mixture does not necessarily translate to higher combined ***,there is a need to establish the link between chemical extracting efficiency and biotoxicity outcome to standardize extraction methods for biotoxicity assessment of environmental *** study compares the performance of five different extraction phases in solid phase extraction(SPE),namely HLB,HLB+coconut,c18 cartridge,c18 disk and Strata-x,and evaluated their chemical extracting efficiencies and biotoxicity *** quantitatively assessed cytotoxicity,acute toxicity,genotoxicity,estrogenic activity,and neurotoxicity of the extracts using in vitro bioassays and characterized the chemical extracting efficiencies of the SPE methods through chemical recoveries of 23 model compounds with different polarities and total organic *** Pareto ranking,we identified HLB+coconut as the optimal SPE method,which exhibited the highest level of water sample biotoxicity and recovered the most chemicals in water *** found that the biotoxicity outcomes of the extracted water samples significantly and positively correlated with the chemical extracting efficiencies of the SPE ***,we observed synchronous changing patterns in biotoxicity outcome and chemical extracting efficiencies in response to increasing sample volumes per cartridge(SVPc)during *** findings underscore that higher chemical extracting efficiency of SPE corresponds to higher biotoxicity outcome of environmental water samples,providing a scientific basis for standardization of SPE methods for adequate assessment of biotoxicities of environmental waters.

关键词： Biotoxicity chemical recovery Solid phase extraction Surface water Wastewater

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Implication of community-level ecophysiological parameterization to modelling ecosystem productivity:a case study across nine contrasting forest sites in eastern china

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Journal of Forestry Research 2024年第1期35卷 1-11页

作者： Minzhe Fang changjin cheng Nianpeng he Guoxin Si Osbert Jianxin Sun School of Ecology and Nature conservation Beijing Forestry UniversityBeijing 100083China Research Institute of Energy Saving Environmental ProtectionOccupational Safety and HealthChina Academy of Railway Sciences Corporation LimitedBeijing 100081China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China college of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Parameterization is a critical step in modelling ecosystem ***,assigning parameter values can be a technical challenge for structurally complex natural plant communities;uncertainties in model simulations often arise from inappropriate model *** we compared five methods for defining community-level specific leaf area(SLA)and leaf c:N across nine contrasting forest sites along the North-South Transect of Eastern china,including biomass-weighted average for the entire plant community(AP_BW)and four simplified selective sampling(biomass-weighted average over five dominant tree species[5DT_BW],basal area weighted average over five dominant tree species[5DT_AW],biomass-weighted average over all tree species[AT_BW]and basal area weighted average over all tree species[AT_AW]).We found that the default values for SLA and leaf c:N embedded in the Biome-BGc v4.2 were higher than the five computational methods produced across the nine sites,with deviations ranging from 28.0 to 73.3%.In addition,there were only slight deviations(he whole plant community sampling(AP_BW)predicted NPP and the four simplified selective sampling methods,and no significant difference between the predictions of AT_BW and AP_BW except the Shennongjia *** findings in this study highlights the critical importance of computational strategies for community-level parameterization in ecosystem process modelling,and will support the choice of parameterization methods.

关键词： Biome-BGc community traits Forest Ecosystems Model parameterization

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Efficient and bright broadband electroluminescence based on environmentfriendly metal halide nanoclusters

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Light(Science & Applications) 2024年第4期13卷 727-737页

作者： Dingshuo Zhang Meiyi Zhu Yifan he Qingli cao Yun Gao Hongjin Li Guochao Lu Qiaopeng cui Yongmiao Shen Haiping he xingliang Dai Zhizhen Ye School of Materials Science and Engineering State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University310027 HangzhouChina Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials and Engineering Research centre of Zhejiang Province Institute of WenzhouZhejiang University325006 WenzhouChina Wenzhou xINxINTAIJING Tech.co.Ltd. 325006 WenzhouChina Department of chemistry Zhejiang Sci-Tech University310018 HangzhouChina

Broadband electroluminescence based on environment-friendly emitters is promising for healthy lighting yet remains an unprecedented challenge to *** copper halide-based emitters are competitive candidates for broadband emission,but their high-performance electroluminescence shows inadequate broad emission bandwidth of less than 90 ***,we demonstrate efficient ultra-broadband electroluminescence from a copper halide(cuI)nanocluster single emitter prepared by a one-step solution synthesis-deposition process,through dedicated design of ligands and subtle selection of *** cuI nanocluster exhibits high rigidity in the excitation state as well as dual-emissive modes of phosphorescence and temperature-activated delayed fluorescence,enabling the uniform cluster-composed film to show excellent stability and high photoluminescent *** consequence,ultra-broadband light-emitting diodes(LEDs)present nearly identical performance in an inert or air atmosphere without encapsulation and outstanding high-temperature operation performance,reaching an emission full width at half maximum(FWHM)of~120 nm,a peak external quantum efficiency of 13%,a record maximum luminance of~50,000 cd m^(−2),and an operating half-lifetime of 137 h at 100 cd m^(−2).The results highlight the potential of copper halide nanoclusters for next-generation healthy lighting.

关键词： halide cluster rigidity

Distribution and correlation of refractive parameters in children with different corneal curvatures in southeast china

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International Journal of Ophthalmology(English edition) 2024年第4期17卷 713-720页

作者： Si-Yuan he Ting he Meng-Yue xu Ying-Jie Ni chao-Yang Hong Ting Shen The Second clinical college Zhejiang Chinese Medical UniversityHangzhou 310053Zhejiang ProvinceChina Department of Ophthalmology Zhejiang Provincial People’s HospitalAffiliated People’s HospitalHangzhou Medical CollegeHangzhou 310014Zhejiang ProvinceChina Eye center the Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009Zhejiang ProvinceChina

AIM:To analyze the distribution of refractive status in school-age children with different corneal curvatures(cc)and the correlation between cc and refractive ***:A total of 2214 school-aged children of grade 4 in Hangzhou who were screened for school myopia were *** distance visual acuity(UcDVA),non-cycloplegic refraction,axial length(AL),horizontal and vertical corneal curvature(K1,K2)were measured and spherical equivalent(SE),corneal curvature radius(ccR)and axial length/corneal radius of curvature ratio(AL/cR)were ***classified as school-screening *** to the different ccRs,the patients were divided into the lower corneal curvature(Lcc)group(ccR≥7.92)and the higher corneal curvature(Hcc)group(ccRch group was further divided into the normal AL subgroup and the long AL *** refractive parameters were compared to identify any differences between the two ***:Both SE and AL were greater in the Lcc group(P=0.013,Phe prevalence of myopia was 38% in the Lcc group and 44% in the Hcc group(Phe proportion of children without screening myopia was higher in the Lcc group(62%)than in the Hcc group(56%).Among these children without screening myopia,the proportion of long AL in the Lcc group(24%)was significantly higher than that in the Hcc group(0.012%;Phe change of SE in the Lcc group was less affected by the increase of AL than that in the Hcc ***:School-aged children in the Lcc group have a lower incidence of screening myopia and longer *** cc can mask SE reduction and AL growth to some extent,and the change of AL growth change more in children with low cc than high *** the onset of myopia,its growth rate is even faster than that after the onset of myopia.

关键词： school-aged children corneal curvature axial length spherical equivalent myopia screening

Photocatalytic Minisci-type multicomponent reaction for the synthesis of 1-(halo)alkyl-3-heteroaryl bicyclo[1.1.1]pentanes

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chinese chemical Letters 2024年第10期35卷 32-34页

作者： Rong-Nan Yi Wei-Min he Key Laboratory of Food & Environment & Drug Monitoring and Testing of Universities in Hunan Province Hunan Police Academy School of chemistry and chemical Engineering University of South China

Bioisosteres play an important role in pharmaceutical and agri cultural compound design that has been developed to enhance the properties of *** a sp3-rich small ring cage hydro carbons,bicyclo[1.1.1]pentanes （BcPs） were commonly considered as a bioisostere of the para-substituted arenes,internal alkynes and tert–butyl groups,and its introduction can significantly im prove pharmacokinetic properties,including passive permeability aqueous solubility,metabolic stability[1].Over the past decades numerous pharmaceutically relevant molecules with biaryl frame works were improved by the approach of bioisosteric replacement conventional strategies for the synthesis of such BcP-aryls deriva tives mostly depend on the stepwise c–c formation via the di rect addition to bridgehead c–c bond of[1.1.1]propellane to pro vide active BcP-intermediates and followed by a second transition metal cross-coupling ***,these pioneer works were limited by the low step economy,the use of unstable reagents and harsh conditions in industrial ***,radical mediated one-step,multi-component reactions[2-6]for synthe sizing various BcP-aryl derivatives have made progress,although these strategies were limited to the prefunctionalized （het）arene and tertiary alkyl radicals[7].Therefore,it is of great significance to develop a method for diverse BcP-aryls that can be compatible with primary,secondary,tertiary radicals and direct c–H function alization of （het）arenes.

关键词：

STcF conceptual design report (Volume 1): Physics & detector

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Frontiers of physics 2024年第1期19卷 1-154页

作者： M.Achasov x.c.Ai L.P.An R.Aliberti Q.An x.Z.Bai Y.Bai O.Bakina A.Barnyakov V.Blinov V.Bobrovnikov D.Bodrov A.Bogomyagkov A.Bondar I.Boyko Z.H.Bu F.M.cai H.cai J.J.cao Q.H.cao x.cao Z.cao Q.chang K.T.chao D.Y.chen H.chen H.x.chen J.F.chen K.chen L.L.chen P.chen S.L.chen S.M.chen S.chen S.P.chen W.chen x.chen x.F.chen x.R.chen Y.chen Y.Q.chen H.Y.cheng J.cheng S.cheng T.G.cheng J.P.Dai L.Y.Dai x.c.Dai D.Dedovich A.Denig I.Denisenko J.M.Dias D.Z.Ding L.Y.Dong W.H.Dong V.Druzhinin D.S.Du Y.J.Du Z.G.Du L.M.Duan D.Epifanov Y.L.Fan S.S.Fang Z.J.Fang G.Fedotovich c.Q.Feng x.Feng Y.T.Feng J.L.Fu J.Gao Y.N.Gao P.S.Ge c.Q.Geng L.S.Geng A.Gilman L.Gong T.Gong B.Gou W.Gradl J.L.Gu A.Guevara L.c.Gui A.Q.Guo F.K.Guo J.c.Guo J.Guo Y.P.Guo Z.H.Guo A.Guskov K.L.Han L.Han M.Han x.Q.Hao J.B.he S.Q.he x.G.he Y.L.he Z.B.he Z.x.heng B.L.Hou T.J.Hou Y.R.Hou c.Y.Hu H.M.Hu K.Hu R.J.Hu W.H.Hu x.H.Hu Y.c.Hu J.Hua G.S.Huang J.S.Huang M.Huang Q.Y.Huang W.Q.Huang x.T.Huang x.J.Huang Y.B.Huang Y.S.Huang N.Hüsken V.Ivanov Q.P.Ji J.J.Jia S.Jia Z.K.Jia H.B.Jiang J.Jiang S.Z.Jiang J.B.Jiao Z.Jiao H.J.Jing x.L.Kang x.S.Kang B.c.Ke M.Kenzie A.Khoukaz I.Koop E.Kravchenko A.Kuzmin Y.Lei E.Levichev c.H.Li c.Li D.Y.Li F.Li G.Li G.Li H.B.Li H.Li H.N.Li H.J.Li H.L.Li J.M.Li J.Li L.Li L.Li L.Y.Li N.Li P.R.Li R.H.Li S.Li T.Li W.J.Li x.Li x.H.Li x.Q.Li x.H.Li Y.Li Y.Y.Li Z.J.Li H.Liang J.H.Liang Y.T.Liang G.R.Liao L.Z.Liao Y.Liao c.x.Lin D.x.Lin x.S.Lin B.J.Liu c.W.Liu D.Liu F.Liu G.M.Liu H.B.Liu J.Liu J.J.Liu J.B.Liu K.Liu K.Y.Liu K.Liu L.Liu Q.Liu S.B.Liu T.Liu x.Liu Y.W.Liu Y.Liu Y.L.Liu Z.Q.Liu Z.Y.Liu Z.W.Liu I.Logashenko Y.Long c.G.Lu J.x.Lu N.Lu Q.F.Lü Y.Lu Y.Lu Z.Lu P.Lukin F.J.Luo T.Luo x.F.Luo Y.H.Luo H.J.Lyu x.R.Lyu J.P.Ma P.Ma Y.Ma Y.M.Ma F.Maas S.Malde D.Matvienko Z.x.Meng R.Mitchell A.Nefediev Y.Nefedov S.L.Olsen Q.Ouyang P.Pakhlov G.Pakhlova x.Pan Y.Pan E.Passemar Y.P.Pei H.P.Peng L.Peng x.Y.Peng x.J.Peng K.Peters S.Pivovarov E.Pyata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian c.F.Qiao J.J.Qin J.J.Qin L.Q.Qin x.S.Qin T.L.Qiu J.Rademacker c.F.Redmer H.Y.Sang Anhui University Hefei 230039China Beihang University Beijing 100191China Budker Institute of Nuclear Physics Novosibirsk 630090Russia cAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China cavendish Laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom central china Normal University Wuhan 430079China central South University Changsha 410083China china University of Geosciences Wuhan 430074China china University of Mining and Technology Xuzhou 221116China École Polytechnique Fédérale de Lausanne(EPFL) LausanneSwitzerland Fudan University Shanghai 200433China Goethe University Frankfurt D-60325 Frankfurt am MainGermany Guangxi Normal University Guilin 541004China Guangxi Uninversity Nanning 530004China Hangzhou Institute for Advanced Study UCASHangzhou 310024China hebei Normal University Shijiazhuang 050024China hebei University Baoding 071002China hefei University of Technology Hefei 230601China helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany henan Normal University Xinxiang 453007China henan University Kaifeng 475004China High Energy Physics center Chung-Ang UniversitySeoul 06974Korea Higher School of Economy 11 Pokrovsky Bulvar Moscow 109028Russia Huangshan University Huangshan 245000China Hubei University of Automotive Technology Shiyan 442002China Hunan Normal University Changsha 410081China Hunan University of Science and Technology Xiangtan 411201China Hunan University Changsha 410082China Indiana University BloomingtonIndiana 47405USA Inner Mongolia University Hohhot 010021China Institute of Advanced Science Facilities Shenzhen 518107China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Physics Academia SinicaTaipeiTaiwan 11529China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Jilin University Changch

The superτ-charm facility(STcF)is an electron–positron collider proposed by the chinese particle physics *** is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or *** STcF will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory—the BEPcII,providing a unique platform for exploring the asymmetry of matter-antimatter(charge-parity violation),in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions,as well as searching for exotic hadrons and physics beyond the Standard *** STcF project in china is under development with an extensive R&D *** document presents the physics opportunities at the STcF,describes conceptual designs of the STcF detector system,and discusses future plans for detector R&D and physics case studies.

关键词： electron–positron collider tau-charm region high luminosity STcF detector conceptual design