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Printability disparities in heterogeneous material combinations via laser directed energy deposition:a comparative study

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International Journal of Extreme Manufacturing 2024年第2期6卷 389-405页

作者： Jinsheng Ning Lida Zhu Shuhao Wang Zhichao Yang peihua xu Pengsheng xue Hao Lu Miao Yu Yunhang Zhao Jiachen Li Susmita Bose Amit Bandyopadhyay School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819People’s Republic of China School of Machinery and Automation Wuhan University of Science and TechnologyWuhan 430081People’s Republic of China School of Mechanical Engineering Xi’an University of Science and TechnologyXi’an 710054People’s Republic of China Beijing Institute of Space Launch Technology Beijing 100076People’s Republic of China W.M.Keck Biomedical Materials Research Lab School of Mechanical and Materials EngineeringWashington State UniversityPullmanWA 99164United States of America

Additive manufacturing provides achievability for the fabrication of bimetallic and multi-material structures;however,the material compatibility and bondability directly affect the parts’formability and final *** is essential to understand the underlying printability of different material combinations based on an adapted ***,the printability disparities of two common and attractive material combinations(nickel-and iron-based alloys)are evaluated at the macro and micro levels via laser directed energy deposition(DED).The deposition processes were captured using in situ high-speed imaging,and the dissimilarities in melt pool features and track morphology were quantitatively investigated within specific process ***,the microstructure diversity of the tracks and blocks processed with varied material pairs was comparatively elaborated and,complemented with the informative multi-physics modeling,the presented non-uniformity in mechanical properties(microhardness)among the heterogeneous material pairs was *** differences in melt flow induced by the unlike thermophysical properties of the material pairs and the resulting element intermixing and localized re-alloying during solidification dominate the presented dissimilarity in printability among the material *** work provides an in-depth understanding of the phenomenological differences in the deposition of dissimilar materials and aims to guide more reliable DED forming of bimetallic parts.

关键词： directed energy deposition printability microstructure microhardness bimetallic parts

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基于机器学习的风电场风速多模式集合预报

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南方能源建设 2024年第1期11卷 85-95页

作者：高盛许沛华陈正洪湖北省气象服务中心湖北武汉430205

[目的]随着大量风电场的兴建,组合研究不同的机器学习算法和气象预报模式已成为研究焦点。[方法]文章以湖北省风能资源的空间分布特征为基础,通过选取代表站点结合实验数据分析对结果进行深入探讨。[结果]在湖北省,已建和在建的风电场... 详细信息

[目的]随着大量风电场的兴建,组合研究不同的机器学习算法和气象预报模式已成为研究焦点。[方法]文章以湖北省风能资源的空间分布特征为基础,通过选取代表站点结合实验数据分析对结果进行深入探讨。[结果]在湖北省,已建和在建的风电场主要集中在“三带一区”的区域,具体包括:位于湖北省中部,从荆门至荆州的南北向风带;位于鄂北,从枣阳至英山的东西向风带;部分湖岛和沿湖地带;以及鄂西南和鄂东南的部分高山地区。该研究采用4种不同的数值预报产品,包括CMA-WSP、CMA-GD、WHMM和EC,与实测风速对比深入探究这些数值模式的适用范围。[结论]通过分析基于机器学习的5种集合预报方法及均值法在湖北省各地区的表现确定了适合的算法和预报模式组合,为提高集合预报的准确性提供了参考。

关键词：风功率预测机器学习算法随机森林 LightGBM AdaBoost GRU LSTM 集合预报

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基于改进LSTM神经网络的风电功率短期预报算法

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南方能源建设 2024年第1期11卷 112-121页

作者：高盛许沛华陈正洪成驰湖北省气象服务中心湖北武汉430205

[目的]风能的波动性和间歇性给大规模的风电并网提出了挑战,解决这一问题的有效途径是能够提供准确的风电功率预报。[方法]针对这一挑战,提出了一种新的基于改进LSTM(长短期记忆)架构的深度学习神经网络的风功率预报模型,包含自主研制... 详细信息

[目的]风能的波动性和间歇性给大规模的风电并网提出了挑战,解决这一问题的有效途径是能够提供准确的风电功率预报。[方法]针对这一挑战,提出了一种新的基于改进LSTM(长短期记忆)架构的深度学习神经网络的风功率预报模型,包含自主研制的数据异常检测与处理、风速特征提取、超参数调优于一体的风电功率预报方法。为了使神经网络模型能更加准确地学习风速特征对风电功率的影响,还定义了一种使用特征筛选以及特征倍增相结合的特征工程方法。[结果]仿真结果表明:所提出的数据清洗及数据增强算法在各种机器学习算法上可以将准确率提升约5%。提出的改进LSTM神经网络模型在数据清洗后与传统算法以及业内主流神经网络算法进行对比,可以将准确率提升2.5%。[结论]改进的方法不但具有较好的噪声数据清洗能力,而且在所有的试验中,改进模型在预报准确性方面优于其他所有算法,可以为实际应用提供指导。

关键词：风功率日前预报 LSTM神经网络深度学习异常检测与处理风速波动特征

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中国气象局风能太阳能预报系统(CMA-WSP)在风资源短期预报中的检验评估

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南方能源建设 2024年第1期11卷 73-84页

作者：王明孟丹许沛华许杨陈正洪贾蓓西湖北省气象服务中心湖北武汉430205 中国气象局武汉暴雨研究所暴雨监测预警湖北省重点实验室湖北武汉430205 中国气象局公共气象服务中心北京100081

[目的]为检验中国气象局风能太阳能预报系统(CMA-WSP)风速产品在风资源短期预报中的可靠性,对CMAWSP 100 m风速3 d预报产品进行检验分析。[方法]文章利用湖北省枣阳周楼、麻城蔡家寨和大金中部3个风电场100 m风速实测数据开展研究。[结... 详细信息

[目的]为检验中国气象局风能太阳能预报系统(CMA-WSP)风速产品在风资源短期预报中的可靠性,对CMAWSP 100 m风速3 d预报产品进行检验分析。[方法]文章利用湖北省枣阳周楼、麻城蔡家寨和大金中部3个风电场100 m风速实测数据开展研究。[结果]研究结果如下:(1)CMA-WSP对枣阳风电场3 d内风速的整体预报效果较好,预报结果与实测风速变化趋势较为一致,逐15 min、小时平均和日平均风速第1 d的预报与实测风速相关系数可达0.728、0.740和0.860,随着预报时效增加,预报与实测相关性逐渐降低。(2)CMA-WSP预报风速与实测风速相对误差变化规律性强,逐15 min、小时平均和日平均风速第1 d预报相对误差分别为68%、70%和92%,预报风速整体高于实测风速;小时平均风速及相对误差均呈现白天小、晚上大的特征;月平均风速变化与MRE值变化呈相反趋势,且在1~6月和10~12月最低、7~9月最大。(3)从地区差异来看,CMA-WSP对枣阳周楼风电场风速的预报效果最好,第1 d预报与实测风速相关性可以达到0.728,第2~3 d的预报相关性也超过0.6,CMA-WSP对蔡家寨和大金中部风电场的预报与实测风速相关系数均低于0.6。[结论]CMA-WSP风速预报效果整体较好,且相对误差具有一定的规律性,有利于下一步对该产品进行订正、降低误差水平。

关键词： CMA-WSP 风电场预报风速实测数据预报效果

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The crystallographic texture and dependent mechanical properties of the CrCoNi medium-entropy alloy by laser remelting strategy

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Journal of Materials Science & Technology 2022年第16期111卷 245-255页

作者： Pengsheng xue Lida Zhu Jinsheng Ning peihua xu Shuhao Wang Zhichao Yang Yuan Ren Guiru Meng School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Laser remelting(LR)has attracted widespread attention in recent years as an effective method to reduce internal defects and improve the surface quality of additively manufactured(AM)*** the present study,three different LR inter-layer scanning strategies(LR0,LR90 and LR45)and their effects on the porosity,microstructure,crystallographic texture and related mechanical properties of parts have been *** microscope,X-ray diffraction,and scanning electron microscope were used as characterization *** the LR90 sample,it shows obvious{111}texture and strongpreferred orientation along the scanning direction(SD),while the 0°offset and the 45°rotation of LR scanning strategy form a finer microstructure and weak crystallographic ***,the mechanical properties of the LR sample are improved compared with the sample only by laser metal deposition(LMD),and a combination of higher strength and optimal uniform elongation is obtained in the LR45 *** overall results show that a reasonable LR scanning strategy can reduce the anisotropy of AM parts and improve their mechanical properties.

关键词： CrCoNi Laser remelting Porosity Crystallographic orientation Mechanical properties

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Source apportionment of VOCs in a typical medium-sized city in North China Plain and implications on control policy

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Journal of Environmental Sciences 2021年第9期33卷 26-37页

作者： Juanjuan Qin Xiaobo Wang Yanrong Yang Yuanyuan Qin Shaoxuan Shi peihua xu Rongzhi Chen xueming Zhou Jihua Tan Xinming Wang College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Faculty of Earth Resources China University of GeosciencesWuhan 430074China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China

Characteristics of atmospheric VOCs(volatile organic compounds) have been extensively studied in megacities in China, however, they are scarcely investigated in medium/smallsized cities in North China Plain(NCP).A comprehensive research on possible sources of VOCs was conducted in a medium-sized city of NCP, from May to September 2019.A total of 143 canister samples of 8 sites in xuchang city were collected, and 57 VOC species were *** average VOC concentrations were 42.6 ± 31.6 μg/m3, with 53.7 ± 31.0 μg/m3 and 32.1 ± 27.8 μg/m^(3), in the morning and afternoon, *** and aromatics contributed 80% of the total ozone formation potential(OFP).Aromatics accounted for more than 95% of secondary organic aerosol potential(SOAP).VOCs were dominated by the local emission with significant transport from the southeast *** analysis extracted 6 sources, which were combustion(33.1%), LPG usage(19.3%), vehicular exhaust & fuel evaporation(15.8%), solvent usage(15.2%), industrial(9.11%) and biogenic(7.51%), respectively and they contributed 33.4%, 17.6%, 12.9%, 18.6%, 9.28% and 8.22% to the OFP, *** and LPG usage were the dominant VOC sources;and combustion, solvent usage and LPG usage were the main sources of OFP in xuchang city, which were different to megacities in China with a high contribution from vehicular exhaust, solvent usage and industry,suggesting specific control strategies on VOCs need to be implemented in medium-sized city such as xuchang city.

关键词： Volatile organic compounds Source apportionment Ozone Positive matrix factorization Medium-sized city

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医院网络信息安全管理研究

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微型电脑应用 2024年第9期40卷 123-124,138页

作者：庞浩杰王琦璟李梦辉许培华汪显博河南省洛阳正骨医院(河南省骨科医院) 网络维护中心河南郑州451470 河南工业大学电气工程学院河南郑州450001

在如今这个信息化的时代,各种“互联网+”层出不穷,医院也开展了信息化、现代化的建设。各级医院都积极运用互联网技术建立网络服务平台,为患者提供线上挂号、问诊等服务,给医院和患者都带来了便利。医院信息化建设的同时也产生了一定... 详细信息

在如今这个信息化的时代,各种“互联网+”层出不穷,医院也开展了信息化、现代化的建设。各级医院都积极运用互联网技术建立网络服务平台,为患者提供线上挂号、问诊等服务,给医院和患者都带来了便利。医院信息化建设的同时也产生了一定的信息安全威胁,比如网络系统硬件、软件等都面临着一定的安全问题。医院需要制定相应的网络信息安全管理策略,比如加强软件系统与硬件设备维护、加大医院网络安全管理人员培训力度等,实现对医院网络信息安全问题的有效防范,提高医院稳定、安全运营的可靠性。

关键词：医院网络信息安全问题管理策略

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Melatonin and dopamine alleviate waterlogging stress in apples by recruiting beneficial endophytes to enhance physiological resilience

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Journal of Integrative Agriculture 2024年第7期23卷 2270-2291页

作者： Yang Cao peihua Du Yuwei Shang Jiahao Ji Leiqing Tan xue Zhang Jizhong xu Bowen Liang College of Horticulture Hebei Agricultural UniversityBaoding 071001China

Melatonin and dopamine can potentially prevent waterlogging stress in *** current study investigated the mechanism by which melatonin and dopamine alleviate apple waterlogging *** study demonstrated that melatonin and dopamine alleviated waterlogging by removing reactive oxygen species(ROS),and that the nitric oxide(NO)content and nitrate reductase(NR)activity were significantly *** and dopamine were also found to recruit different candidate beneficial endophytes(melatonin:Novosphingobium,Propionivibrio,and Cellvibrio;dopamine:Hydrogenophaga,Simplicispira,Methyloversatilis,Candidatus_Kaiserbacteria,and Humicola),and these endophytes were significantly and positively correlated with plant *** analyses showed that melatonin and dopamine significantly affected the endophytic bacterial and fungal communities under waterlogging *** metabolomic results showed that melatonin and dopamine led to waterlogging resistance by upregulating the abundance of beneficial substances such as amino acids,flavonoids,coumarins,and organic *** addition,melatonin and dopamine regulated the physicochemical properties of the soil,which altered the endophyte community and affected plant *** co-occurrence network demonstrated close and complex relationships among endophytes,metabolites,soil,and the *** results demonstrate that melatonin and dopamine alleviate waterlogging stress in apples by recruiting beneficial endophytes to enhance physiological *** study provides new insights into how melatonin and dopamine alleviate stress and a theoretical basis for synergistic beneficial microbial resistance to waterlogging stress.

关键词： dopamine endophytes Malus hupehensis melatonin metabolomics waterlogging

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Removal of rubidium from brine by an integrated film of sulfonated polysulfone/graphene/potassium copper ferricyanide

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Chinese Journal of Chemical Engineering 2024年第5期69卷 112-121页

作者： Huanxi xu peihua Lin Pei-Jun Liu Hai-Gang Liu Hui-Bin Guo Chao-Xiang Wu Ming Fang xu Zhang Guan-Ping Jin Anhui Province Engineering Research Center of Flexible and Intelligent Materials School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China Chemical Design and Research Institute Co. LTD of Qinghai ProvinceQinghai Engineering and Technology Research Center of Fine ChemicalXining 810008China

A novel integrated film of sulfonated polysulfone/graphene/potassium copper ferricyanide(KCuFC/SPSG)was used for selectively extracting rubidium ion(Rb^(+))from *** form KCuFC/SPSG,the precursor film of sulfonated polysulfone/graphene(SPSG)was synthesized by phase conversion process,which was alternately immersed in 0.1 mol·L^(-1)CuSO_(4)/K_(4)[Fe(CN)_(6)]by in-situ adsorption coupled co-precipitation *** data such as nuclear magnetic resonance spectrometer,Fourier transform infrared spectroscope,X-ray photoelectron spectroscope,X-ray diffraction,scanning electron microscope,and energy dispersive spectroscopy all verified that abundant KCuFC were uniformly located on the *** resulting KCuFC/SPSG was used in film separation *** the solution was fed into the system,the Rb^(+)could be selectively adsorption by KCuFC/*** the saturation adsorption,0.5 mol·L^(-1)NH_(4)Cl/HCl was fed into the film cell,Rb^(+)could be quickly desorbed by ion-exchange between Rb^(+)and NH_(4)^(+)in the lattice of *** purpose of separating and recovering Rb^(+)from the brine can be achieved after the repeated *** effects of pH,adsorption time,and interferential ions on the adsorption capacity of Rb^(+)were investigated by batch *** adsorption behavior fits the pseudo-second order kinetic process,while KCuFC has a higher adsorption capacity(Langmuir maximum sorption 165.4 mg·g^(-1)).In addition,KCuFC/SPSG shows excellent selectivity for Rb^(+)even in complex brine ***/SPSG could maintain 93.5%extraction efficiency after five adsorption/desorption cycles.

关键词： Rubidium extraction Potassium copper ferricyanide Sulfonated polysulfone Graphene oxide Adsorption

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Dopamine improves apple replant disease resistance by regulating physiological resilience and rhizosphere microbial community structure

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Journal of Integrative Agriculture 2024年第9期23卷 3025-3044页

作者： peihua Du Yang Cao Huaite Liu Jiahao Ji Wei Sun xueying Zhang Jizhong xu Bowen Liang College of Horticulture Hebei Agricultural UniversityBaoding 071001China

Apple replant disease(ARD)is a complex agricultural problem caused by multiple stressors that can lead to increased reactive oxygen species(ROS)levels and limited nutrient utilization in ***,existing countermeasures cannot effectively address this ***,we used Malus hupehensis as a test organism to investigate whether the pleiotropic molecule dopamine can alleviate ARD using pot *** application of 100μmol L-1 dopamine significantly promoted the growth of apple seedlings in the replanted soil,with a relative growth rate increase of 17.44%.Our results revealed two major pathways by which dopamine regulates ARD resistance in apple ***,dopamine effectively reduces the level of ROS and activates the expression of genes related to nitrogen(N)transport and *** those genes,MdNLP5,MdNRT1.1,MdNLP2,MdNRT2.5,MdNLP3,MdNRT2.4,MdNADH-GAGOT,and MdFd-GAGOT were strongly regulated by *** regulatory effects promoted the uptake and utilization of soil N by the ***,dopamine improved the physical and chemical properties,enhanced microbial community diversity,and promoted mutual cooperation between microbial communities in the ***,dopamine altered the microbial structure of rhizosphere soil(upregulating Clostridiales,Gaiellales,Sordariales and Mortierellales;downregulating Micrococcales,Longimicrobiales,Hypocreales and Cystobasidiales).Notably,dopamine significantly upregulated the abundances of Gaiella and Mortierella,both of which were positively correlated with soil urease activity,soil available N content,plant growth and N *** also significantly downregulated the abundance of the plant pathogen Gibberella(by 11.71-fold)in replant *** results provide insights into the mechanisms by which dopamine promotes ARD resistance,and can promote the sustainable development of the apple industry.

关键词： continuous cropping barrier exogenous dopamine Malus hupehensis Rehd. 15N-labeling soil microbiome

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