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Three novel dendritic chitosan derivatives for inhibiting acid corrosion of petroleum pipelines

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Petroleum Science 2023年第6期20卷 3918-3930页

作者： Guo-Dong Cui Yan-Ming Chen Qi-Ming zhang Zheng Wang Tian Tang Qing Zhao Yu zhang Li-Feng zhang Yuan-Qi Gu Yang-Sheng Liu College of Environmental Sciences and Engineering Peking UniversityBeijing Key Laboratory for Solid Waste Utilization and ManagementBeijing100871China University of Houston HoustonTX77204United States State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing102249China CenerTech Tianjin Chemical Research and Design Institute Co. LtdChina National Offshore Oil Corp(CNOOC)Tianjin300131China Faculty of Environment and Life Beijing University of TechnologyBeijing100124China Shanxi International Energy Group Co. LtdTaiyuan030002ShanxiChina

In the process of exploration and development of oil and gas fields, the acidic environment of oil reservoir, production and transport processes cause corrosion of pipelines and equipment, resulting in huge economic losses and production safety risks. Corrosion inhibitors were widely used in oil industry because of simple operation process and economical. In this study, three environmentally friendly corrosion inhibitors were synthesized based on the natural polysaccharide chitosan. Corrosion inhibition of three dendritic chitosan derivatives (We name them bh, CH and DH) on mild steel in 1 mol/L HCl solution with natural ventilation system was evaluated by weight loss experiment, electrochemical analysis and surface morphology characterization. The experimental results showed that when the three dendritic chitosan derivatives added in the corrosive medium were 500 mg L^(−1), the corrosion inhibition efficiencies were all more than 80%. Based on quantum chemical calculation, inhibition mechanisms of three dendritic chitosan derivatives were investigated according to molecular structures. The results showed that the benzene ring, Schiff base and N atom contained in the molecule were the active centers of electron exchange, which were more likely to form a film on the carbon steel surface, thereby slowing or inhibiting corrosion. The results also predicted the corrosion inhibition effect bh > DH > CH, which was consistent with the experimental conclusion.

关键词： Chitosan derivatives Corrosion inhibitors Carbon steel Acid inhibition Efficient and environmental

Energy-aware Integrated Scheduling for Container Terminals with Conflict-free AGVs

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Journal of Systems Science and Systems Engineering 2023年第4期32卷 413-443页

作者： Zhaolin Zhong Yiyun Guo Jihui zhang Shengxiang Yang Institute of Complexity Science School of AutomationQingdao UniversityQingdao266071China Shandong Key Laboratory of Industrial Control Technology Qingdao266071China Qingdao Port International Company Ltd.Qingdao266011China Institute of Artificial Intelligence School of Computer Science and InformaticsDe Montfort UniversityLeicesterLE19BHUK

For automated container terminals,the effective integrated scheduling of different kinds of equipment such as quay cranes(QCs),automated guided vehicles(AGVs),and yard cranes(YCs)is of great significance in reducing energy consumption and achieving sustainable *** at the joint scheduling of AGVs and YCs with consideration of conflict-free path planning for AGVs as well as capacity constraints on AGV-mate which is also called buffer bracket in blocks,a mixed integer programming model is established to minimize the energy consumption of AGVs and YCs for the given loading/unloading task.A solution method based on a novel bi-level genetic algorithm(BGA),in which the outer and the inner layer search the optimal dispatching strategy for QCs and YCs,respectively,is *** validity of the model and the algorithm is verified by simulation experiments,which take the Port of Qingdao as an example and the performance under different conflicting resolution strategies is *** results show that,for the given task,the proposed solution to conflict-free path and the schedule provided by the algorithm can complete the task with minimum energy consumption without loss of AGVs utilization,and the number of AGV-mates should be adjusted according to the task rather than keeping *** results indicate that our proposed approach could efficiently find solutions within 6%optimality *** consumption is dropped by an average of 15%.

关键词： Automated container terminal conflict-free routing energy saving improved genetic algorithm

Simultaneous increase in remanence and coercivity during grain refining of Nd-Fe-B deformed magnets

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Journal of Rare Earths 2022年第11期40卷 1763-1771,I0004页

作者： Fengqing Wang Kanghua Chen Juan Du Jian zhang CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences(CAS)Ningbo 315201China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha 410083China Institute of Materials Shanghai UniversityShanghai 200444China

To explore the feasibility of deep grain-size refinement in overcoming the problem of traditional B-Htrade-off in bulk permanent magnets,the effect of deformation temperature on the texture strength,grain refining,and magnetic properties of slow-deformed Nd-Fe-B magnets was systematically *** a result,strong textures with gradual grain refining from conventionally large size of D=650 nm to small nanoscale size of D=53 nm(Ddenotes the lateral size of the aligned plate-like grains)are observed as the temperature reduces from T=650℃to T=450℃.Moreover,magnetic observations show a simultaneous increase in remanence and coercivity as the grain refines from D=650 nm to D=127 *** increase in coercivity results from the grain size refinement as well as the smaller aspect ratio of the plate-like grains,and the increase in remanence results from the improved texture *** compared with the D=650 nm magnets,the simultaneous increase in remanence and coercivity leads to optimum enhancements of 57%in coercivity,10%in remanence,and 25%in energy product,which demonstrate the feasibility of near-nano scale grain refinement in overcoming the traditional B-Htrade-off for improved(bh)*** failure of higher coercivities in the D≤80 nm magnets is closely related with the defect effects of the grain *** explaining the grain refining and texture changing behavior were also discussed.

关键词： NdFeB magnets Grain size Plastic deformation Texture Coercivity Rare earths

Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith simulant for automated construction of lunar infrastructure

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Frontiers of Structural and Civil Engineering 2023年第10期17卷 1535-1553页

作者： Feng LI Rongrong zhang Siqi ZHOU Xingyi ZHU School of Transportation Science and Engineering Beihang UniversityBeijing 100083China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China

Using an in situ lunar regolith as a construction material in combination with 3D printing not only reduces the weight of materials carried from the Earth but also improves the automation of lunar infrastructure *** study aims to improve the printability of a geopolymer based on a bh-1 lunar regolith simulant,including the extrudability,open time,and buildability,by controlling the temperature and adding *** parameters were used to represent printability with different water-to-binder ratios,printing temperatures,and contents of *** mechanical properties of the hardening geopolymer with different filling paths and loading directions were *** results show that heating the printed filaments with a water-to-binder ratio of 0.32 at 80°C can adjust the printability without adding any additive,which can reduce the construction cost of lunar *** printability of the bh-1 geopolymer can also be improved by adding 0.3%Attagel-50 and 0.5%polypropylene fiber by mass at a temperature of 20℃to cope with the changeable environmental conditions on the *** curing under a simulated lunar environment,the 72-h flexural and compressive strengths of the geopolymer specimens reach 4.1 and 48.1 MPa,respectively,which are promising considering that the acceleration of gravity on the Moon is 1/6 of that on the Earth.

关键词： geopolymer lunar regolith simulant 3D printing rheology printability

Novel bake hardening mechanism for bainite-strengthened complex phase steel

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Journal of Materials Science & Technology 2023年第12期143卷 117-128页

作者： Hang Yu Yu Yan Cheng zhang Lijie Qiao Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China

In the automobile industry,stamping and paint baking processes are used to strengthen components,and this not only saves costs,but also further reduces the bodyweight of *** this work,the bake hardening mechanism of the complex phase(CP)steel CP980 was explored by comparing it with that of DP1180,which has a clear bake hardening mechanism and a carbon content similar to that of *** analyzing the bake hardening response and the microstructural changes of the two steels,we found that the bake hardening process of CP980 was divided into three *** the first two stages,the carbon atoms diffused into dislocations to form Cottrell atmosphere pinning dislocations,and excess car-bon atoms formed carbon clusters or low-temperature carbide pinning dislocations that were similar to *** the third stage,the dislocation acted as rapid channels for carbon diffusion,and fine cementite gradually formed when the carbon clusters gathered at the dislocations as precursors,resulting in pre-cipitation *** novel bake-hardening(bh)mechanism is crucial for obtaining a comprehensive understanding of the strain-baking behavior of advanced high-strength steals(AHSS).

关键词： Age hardening Bainitic steel Carbon diffusion Cementite Mechanical property Automotive weight reduction

混料方式对钕铁硼磁粉的流动性和磁体性能的影响

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中国稀土学报 2024年第4期42卷 712-718,I0003页

作者：张茂彩崔红兵王誉那世航程岩艾静雯蒙丽娟辛博包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室内蒙古包头014030 内蒙古稀土功能材料创新中心有限责任公司内蒙古包头014030

通过对气流磨制得的钕铁硼磁粉进行粉体表面改性,利用传统三维混料机及高速剪切混料机进行粉体加工改性,研究了不同混料方式对钕铁硼磁粉的流动性、粒度分布、微观结构以及磁体性能的影响。经高速剪切混料设备改性的钕铁硼磁粉的松装密... 详细信息

通过对气流磨制得的钕铁硼磁粉进行粉体表面改性,利用传统三维混料机及高速剪切混料机进行粉体加工改性,研究了不同混料方式对钕铁硼磁粉的流动性、粒度分布、微观结构以及磁体性能的影响。经高速剪切混料设备改性的钕铁硼磁粉的松装密度达到1.8114 g·cm^(-3),振实密度达到3.7685 g·cm^(-3)。将改性磁粉经取向、等静压成型、烧结制备的钕铁硼磁体性能达到:B_(r)=14.23 kGs,H_(cj)=13.29 kOe,(bh)_(max)=49.42 MGOe。结果表明:改变混料方式能有效缩短混料时间,提升磁体性能,提高生产效率,节约时间成本。

关键词：振实密度钕铁硼磁粉微观结构表面改性

甘肃地区四氢生物蝶呤缺乏症18例患者的遗传学分析

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中华医学遗传学杂志 2024年第2期41卷 129-133页

作者：张钏田芯瑗王玉佩马盼盼陈雪周秉博张庆华郝胜菊惠玲殷哲曹宗富甘肃省妇幼保健院(甘肃省中心医院) 甘肃省出生缺陷与罕见病临床医学研究中心医学遗传中心兰州730050 国家卫生健康委科学技术研究所国家人类遗传资源中心北京100730

目的探讨甘肃地区18例四氢生物蝶呤缺乏症(bh4D)患者的遗传学特征。方法选择2018年1月至2021年12月由甘肃省妇幼保健院医学遗传中心确诊的18例甘肃籍bh4D患者作为研究对象,对其进行全外显子组测序分析,并对候选变异进行Sanger测序家系... 详细信息

目的探讨甘肃地区18例四氢生物蝶呤缺乏症(bh4D)患者的遗传学特征。方法选择2018年1月至2021年12月由甘肃省妇幼保健院医学遗传中心确诊的18例甘肃籍bh4D患者作为研究对象,对其进行全外显子组测序分析,并对候选变异进行Sanger测序家系验证。结果18例bh4D患者的36个等位基因均被成功检出,检出率为100.0%。其中16例是由PTS基因变异所致,2例是由QDPR基因变异所致。PTS基因共检测出10种不同的变异,其中热点变异为c.259C>T(34.38%)及c.286G>A(15.63%)。c.259C>T为已报道致病性变异,c.286G>A、c.166G>A、c.200C>T、c.272A>G、c.402A>C、c.421G>T、c.84-291A>G、c.317C>T为已报道的可能致病性变异。c.289290insCTT既往未见报道,根据美国医学遗传学与基因组学学会变异相关指南评级为可能致病性变异(PM1+PM2Supporting+PM3+PP3+PP4)。QDPR基因的c.478C>T和c.665C>T均被评级为临床意义未明变异(PM1+PM2Supporting+PP3+PP4)。结论基因检测明确了上述研究bh4D家系的基因变异情况,为及时准确的临床干预和患者家庭的遗传咨询和生育决策提供了依据。

关键词：四氢生物蝶呤缺乏症遗传学分析干预治疗遗传咨询家系

Synergistic effect of cobalt and niobium in Co_(3)-Nb-O_(x)on performance of selective catalytic reduction of NO with NH_(3)

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Rare Metals 2022年第1期41卷 166-178页

作者： Bo-Lin zhang Li-Feng Deng Bo Liu Chun-Yun Luo Michael Liebau Shen-Gen zhang Roger Glaser Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China Jiangsu Longkingcotech Co. Ltd.Yancheng 224000China Institute of Chemical Technology Universita¨t LeipzigLeipzig 04103Germany e-mail:roger.glaeser

Combining the redox properties of Co and the acid properties of Nb in a Co_(3)-Nb-O_(x)catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR).Co_(3)O_(4)shows average activity,however,it exhibits a poor N_(2)***_(2)O_(5)is not active for NH_(3)-***,the mixed Co_(3)-Nb-O_(x) catalyst shows higher NO conversion and N_(2)selectivity than the single Co_(3)O_(4)and Nb_(2)O_(5)catalysts at 100–300℃.The results of temperature programmed reduction by H_(2)and X-ray photoelectron(XP)spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co^(3+) and Oa,adjusting the activity for catalytic oxidation to a moderate *** suppresses the formation of undesired N_(2)O from the over-oxidation of NH_(3).Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity,ensuring the high catalytic activity and N2 selectivity in NH3-SCR.

关键词： Co-Nb Selective catalytic reduction Lowtemperature Acid property Redox behavior

Template-Directed Fabrication of Anatase TiO2 Hollow Nanoparticles and Their Application in Photocatalytic Degradation of Methyl Orange

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Chinese Journal of Chemistry 2017年第6期35卷 1016-1022页

作者： Jie Chang Wenjian zhang Chunyan Hong CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Hefei Anhui 230026 China

Polymerization-induced self-assembly （PISA） was used to fabricate polymeric nanoparticles via reversible ad- dition-fragmentation chain transfer （RAFT） dispersion polymerization of benzyl methacrylate （BzMA） using di- block copolymer poly（glycerol monomethacrytate）-block-poly（2-dimethylaminoetbyl methacrylate）（PGMMA- PDMAEMA-CTA） as the macro RAFT agent. The dispersion of polymeric nanoparticles with a final concentration of about 210 mg/g （solid content of 21%） was obtained via this efficient method （PISA）. The resultant polymeric nanoparticles consisting of corona-shell-core three layers with weak polyelectrolyte PDMAEMA as the shell were used as sacrificial template to fabricate TiO2 hollow nanoparticles. The negatively charged titanium precursor was absorbed into the PDMAEMA shell via the electrostatic interaction, and hydrolyzed to form polymer/TiO2 hybrid nanoparticles. Anatase TiO2 hollow nanoparticles were formed after removing the polymeric templates by calcina- tion at 550 ℃. The experiments of photocatalytic degradation of methyl orange showed that the resultant anatase TiO2 hollow nanoparticles had high photocatalytic activity and good reusability.

关键词： polymerization-induced self-assembly RAFT dispersion polymerization TiO2 hollow nanoparticles