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Prediction of flow stresses at high temperatures with artificial neural networks

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中国有色金属学会会刊：英文版 2001年第2期11卷 213-216页

作者：汪凌云郑廷顺刘雪峰黄光杰 College of Materials Science and Engineering Chongqing University southwest aluminum fabrication plant

On the basis of the data obtained on Gleeble 1500 Thermal Simulator, the predicting models for the relation between stable flow stress during high temperature plastic deformation and deformation strain, strain rate and temperature for 1420 Al Li alloy have been developed with BP artificial neural networks method. The results show that the model on basis of BPNN is practical and it reflects the actual feature of the deforming process. It states that the difference between the actual value and the output of the model is in order of 5%. [

关键词： Al Li alloy high temperature plastic deformation flow stress neural networks

Effects of trace addition of vanadium and depression amount on recrystallization temperature and mechanical performance of 5182 belts

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中国有色金属学会会刊：英文版 2006年第A3期16卷 1370-1374页

作者：高家诚陈志强明文良王勇崔先友袁礼军 College of Materials Science and Engineering Chongqing UniversityChongqing 400030China southwest Aluminium fabrication plant Chongqing 401326China

Because the mechanical performances of 5182 belts used for carbonated drinks cover decrease after baking, the effects of trace addition of V and depression amount in last step on microstructure and properties of 5182 belts were investigated. The microstructure, mechanical performances and reciystallization temperature of 5182 belts and 5182V belts in different steps were analyzed comparatively with metallographic microscope, micro-hardness tester, electron universal materials test machine and differential thermal analyzer. The results show that the mechanical performances of the belts are remarkably improved by the trace addition of V and the reduction of depression amount in last step. In addition, the reciystallization temperature of the belts is also increased but not obviously. As the precipitation of V is not full, there are not enough disseminatedly distributed particles, and the recrystallization temperature increases little. However the solution strengthening and the fine grain strengthening are enough to improve the mechanical performances to satisfy customer requirements. The effects of reduction of depression amount in last step on mechanical performance were explained in view of energy. Moreover, the strengthening mechanism of V-compound interlocking grain boundary was also discussed.

关键词：重结晶作用微观结构机械性能温度条件有色金属铝合金

DEVELOPMENT　OF　A　NEW　GENERATION　OF　ADDITIVES　FOR　ALUMINIUM　ROLLING　LUBRICATION

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中国有色金属学会会刊：英文版 1996年第2期6卷 138-143页

作者： Mao Daheng Xiao Gang Ma Wenhong(College of Electro- mechanical Engineering ,Central South University of Technology, Changsha 410083 Northwest Aluminium fabrication plant, Longxi, Gansu 748111) College of Electro-mechanical Engineering Central South University of Technology Changsha 410083 China Northwest Aluminium fabrication plant Longxi Gansu 748111 China

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关键词： aluminium rolling lubricity additives compound mechanisms

Microstructures and mechanical properties of 2014 aluminium alloy forgings made by a new process

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中国有色金属学会会刊：英文版 2000年第2期10卷 139-143页

作者：张新明周卓平曾苏民宋旼 Department of Materials Science and Engineering Central. South University of Technology Changsha 410083 China southwestern Aluminium fabrication plant Chongqing 631326 China

The triangular 2014 aluminium alloy forgings were made by a new process and the traditional process. The results showed that the mechanical properties of the forgings made by the new process are far higher than that in the standard of GB223 84, and also higher than that in the standard of EL/53MI 94; moreover, the mechanical properties are almost the same in each direction, and anisotropies are very small. The grains and 2nd phases were analyzed by using TEM and SEM, the results indicate that very fine grains (3～6 μm)appear in an approximately isometric way, and a large number of 2nd submicrophases(0.05～0.15 μm) disappear in no apparently preferred orientation distribution because the new process involves multidirectional heavy plastic deformation (λ=12), solution(500 ℃/400 min) and ageing(165 ℃/10 h) heat treatments for a long time at high temperatures. These refined grains, 2nd submicrophases and their almost homogeneous distribution can make it possible for the forgings to display high mechanical properties.

关键词： aluminium alloy forging mechanical properties microstructures

Easily fabricated and recyclable Pd&Cu@Al catalyst for gram-scale phosphine-free Heck reactions with high TON

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Science Bulletin 2017年第19期62卷 1325-1330页

作者： Dongliang Zhang Zheng Wei Lei Yu Institute of Pesticide School of Horticulture and Plant ProtectionYangzhou University School of Chemistry and Chemical Engineering Yangzhou University

A unique Pd＆Cu@Al catalyst was easily fabricated just by immersing commercial aluminum foil in a mixed xylene solution of PdC12 and CuCl2. The catalyst fabrication process led to aluminum oxide coatings in situ, which supported the metal nanoparticles and enhanced their catalytic activities for the phosphine-free Heck reaction of awl halides and styrenes with high turnover number （TON） up to 3.9×10^5. The reaction can be scaled up to at least 100 mmol and has been applied in modification of drug Lapatinib＇s intermediate with low metal residue. This novel catalyst is of good application potential in industrial production because it was extremely easy to be recycled, in regardless of the generation of the insoluble impurities or tars during the reaction processes.

关键词： Catalyst recoveryPalladiumnanoparticlesaluminum oxidePhosphine-freeSustainable chemistryHeck reaction

Mobilization of Inorganic Phosphorus from Soils by Ectomycorrhizal Fungi

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Pedosphere 2014年第5期24卷 683-689页

作者： ZHANG Liang WANG Ming-Xia LI Hua YUAN Ling HUANG Jian-Guo C.PENFOLD College of Resources and Environment Southwest University School of Biotechnology and Chemical Engineering Taizhou College Nanjing Normal University School of Agriculture Food and Wine The University of Adelaide

Ectomycorrhizal(EM) fungi could form symbiosis with plant roots and participate in nutrient absorption; however, many EM species commonly found in forest soils, where phosphorus(P) concentration and availability are usually very low, particularly in tropical and subtropical areas, have not yet been investigated for their efficiencies to mobilize soil P. In this study, fungal growth, P absorption,efflux of protons and organic acids, and soil P depletion by four isolates of EM fungi isolated either from acidic or calcareous soils were compared in pure liquid culture using soil as a sole P source. Boletus sp. 7(Bo 7), Lactarius deliciosus 3(Ld 3), and Pisolithus tinctorius 715(Pt 715) from acidic and P-deficient soils of southwestern China showed higher biomass and P concentration and accumulation than Cenococcum geophilum 4(Cg 4) from a calcareous soil of Inner Mongolia, northern China, after 4 weeks of liquid culture. Oxalate, malate, succinate, acetate, and citrate concentrations in the culture solutions varied significantly with fungal species,and oxalate accounted for 51.5%–91.4% of the total organic acids. Organic acids, particularly oxalate, in the culture solutions may lead to the solubilization of iron-bound P(Fe-P), aluminum-bound P(Al-P), and occluded P(O-P) from soil phosphates. Fungal species also varied greatly in proton efflux, which decreased the culture solution pH and may dissolve calcium-bound P(Ca-P) in *** could be the reason for the increment of both inorganic P in the culture solutions and Olsen P in the soil when EM fungi were present. Total inorganic P, the sum of Al-P, Fe-P, O-P, and Ca-P, in the culture solutions was positively correlated with the total concentration of organic acids in the culture solutions(r = 0.918*, n = 5), but negatively with both the total inorganic P in soil(r =-0.970**, n = 5) and the culture solution pH(r =-0.830*, n = 5). These suggested variable efficiencies of EM fungal species to mobilize inorganic P fracti

关键词： EM fungal species inorganic P organic acid P availability proton soil phosphate

Transcriptomic responses to aluminum(Al)stress in maize

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Journal of Integrative Agriculture 2018年第9期17卷 1946-1958页

作者： XU Li-ming LIU Chan CUI Bao-ming WANG Ning ZHAO Zhuo ZHOU Li-na HUANG Kai-feng DING Jian-zhou DU Han-mei JIANG Wei ZHANG Su-zhi Key Laboratory of Biology and Genetic Improvement of Maize in southwest China Ministry of Agriculture/Maize Research InstituteSichuan Agricultural UniversityChengdu 611130P.R.China Crop Research Institute of Binzhou Binzhou 256600P.R.China

aluminum （AI） toxicity is a major factor limiting crop production and plant growth in acid soils. The complex inheritance of AI toxicity and tolerance mechanisms in maize has uncharacterized yet. In this study, the maize inbred line 178 seedlings were treated with 200 μmol L-1 CaCI2＋0 μmol L^-1AICI3 （control） and 200μmol L^-1 CACI2＋60 IJmol L^-1 AICI3 （AI treatment） for I and 6 h, respectively. The experiment was repeated three times. Then a detailed temporal analysis of root gene expression was performed using an Agilent GeneChip with 34 715 genes, only the genes showing more than 2.0-fold difference （P〈0.01） between the control and the AI treatment maize seedlings were analyzed further. Thus, a total of 832 different expression genes, 689 significantly up-regulated and 143 down-regulated, were identified after the seedlings were treated with AI for 6 h. And 60 genes, 59 up-regulated and one down-regulated, were also detected after the seedlings were treated for 1 h. Replicated transcriptome analyses further showed that about 61% of total significantly genes could be annotated based on plant genome resources. Quantitative real-time PCR （qRT-PCT） of some selected candidate genes was used to demonstrate the microarray data, indicating significant differences between the control and AI-treated seedlings. Exposure to AI for 6 h triggered changes in the transcript levels for several genes, which were primarily related to cell wall structure and metabolism, oxidative stress response, membrane transporters, organic acid metabolism, signaling and hormones, and transcription factors, etc. After AI-treated for 1 h, differential abundance of transcripts for several transporters, kinase, and transcription factors were specifically induced. In this study, the diversity of the putative functions of these genes indicates that AI stress for a short stage induced a complex transcriptome changes in maize. These results would further help us to understand rapid and early mechanisms o

关键词： aluminum maize microarray mechanism transcriptome

Differential aluminum tolerance and absorption characteristics in Pinus massoniana seedlings colonized with ectomycorrhizal fungi of Lactarius deliciosus and Pisolithus tinctorius

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林业研究:英文版 2023年第5期34卷 1523-1533页

作者： Xirong Gu Hao Jia Xiaohe Wang Yanan Jiang Jie Li Xinhua He Centre of Excellence for Soil Biology College of Resources and EnvironmentSouthwest University2 Tiansheng RoadBeibeiChongqing 400715People’s Republic of China School of Biological Sciences University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Land Air and Water ResourcesUniversity of California at DavisOne Shields AvenueDavisCA 95616USA

plant tolerance to aluminum(Al)toxicity can be enhanced by an ectomycorrhizal(ECM)fungus through biological filtering or physical *** understand the roles of ECM colonization in Al absorption with regard to Al tolerance,Pinus massoniana seedlings were inoculated with either Lactarius deliciosus(L.:Fr.)Gray isolate 2 or Pisolithus tinctorius(Pers.)Coker et Couch isolate 715 and cultivated in an acid yellow soil with or without 1.0 mM Al^(3+)irrigation for 10 *** production,Al bioaccumulation and transport in seedlings colonized by the two ECM fungi were compared,and the three absorption kinetics(pseudo-first order,pseudo-second order and intraparticle diffusion)models used to evaluate variances in root Al^(3+)absorption *** show that both fungi increased aboveground biomass and Al tolerance of *** seedlings,but *** 2 was more effective than *** *** Al absorption capacity,fewer available active sites and decreased affinity and boundary layer thickness for Al^(3+),and higher Al accumulation and translocation contributed to the increased Al tolerance in the ECM-inoculated *** results advance our understanding of the mechanisms and strategies in plant Alto lerance conferred by ECM fungi and show that inoculation with *** will better enhance Al tolerance in *** seedlings used for forest plantation and ecosystem restoration in acidic soils,particularly in southwest China and similar soils worldwide.

关键词： Acidic soil aluminum accumulation Absorption characteristics Ectomycorrhizal fungi Pinus massoniana

Nanowire fabrication in Porous Alumina Tempalets Produced by Employing Sulphuric, Oxalic and Phosphoric Acids

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Open Journal of Inorganic Non 2015年第3期5卷 41-49页

作者： Ramakrishna Kotha Diana Strickland Arturo A. Ayon MEMS Research Lab Department of Physics & Astronomy University of Texas San Antonio San Antonio TX USA Applied Physics Division Southwest Research Institute San Antonio TX USA

We report the growth of silver nanowires with varying diameters in porous anodic aluminum-oxide (AAO) membranes by using the electroless deposition approach. This objective is carried out in 2 phases. In Phase 1, AAO membranes on high purity aluminum foils are electrochemically grown by a double anodization procedure. Three different electrolytes, sulphuric acid (H2SO4), oxalic acid (H2C2O4) and phosphoric acid (H3PO4), are employed to produce membranes with varying pore diameters. Other parameters such as interpore distance, barrier layer thickness and membrane thickness are also explored. In addition, characterization to modify the pore diameter and open the barrier layer of free standing AAO templates has been carried out. In Phase 2, metallic silver nanowires are grown by electroless deposition inside pores with varying diameters in AAO membranes. AAO membranes immersed in aqueous silver nitrate solutions are thermally reduced, and the resulting silver nanowires are characterized by using a scanning electron microscope (SEM).

关键词： Anodic aluminum Oxide Electroless Deposition Silver Nanowires Barrier Layer