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Subsoil tillage enhances wheat productivity,soil organic carbon and available nutrient status in dryland fields

Journal of Integrative Agriculture 2024年第1期23卷 251-266页

作者： qiuyan Yan Linjia Wu Fei Dong Shuangdui Yan Feng Li Yaqin Jia Jiancheng Zhang Ruifu Zhang Xiao huang Institute of Wheat Research Shanxi Agricultural UniversityLinfen 041000China State Key Laboratory of Sustainable Dryland Agriculture(in preparation) Shanxi Agricultural UniversityTaiyuan 030031China College of Resources and Environment Shanxi Agricultural UniversityTaigu 030801China Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization National Engineering Research Center for Organicbased FertilizersNanjing Agricultural UniversityNanjing 210095China

Tillage practices during the fallow period benefit water storage and yield in dryland wheat crops.However,there is currently no clarity on the responses of soil organic carbon(SOC),total nitrogen(TN),and available nutrients to tillage practices within the growing season.This study evaluated the effects of three tillage practices(NT,no tillage;SS,subsoil tillage;DT,deep tillage)over five years on soil physicochemical properties.Soil samples at harvest stage from the fifth year were analyzed to determine the soil aggregate and aggregate-associated C and N fractions.The results indicated that SS and DT improved grain yield,straw biomass and straw carbon return of wheat compared with NT.In contrast to DT and NT,SS favored SOC and TN concentrations and stocks by increasing the soil organic carbon sequestration rate(SOCSR)and soil nitrogen sequestration rate(TNSR)in the 0-40 cm layer.Higher SOC levels under SS and NT were associated with greater aggregate-associated C fractions,while TN was positively associated with soluble organic nitrogen(SON).Compared with DT,the NT and SS treatments improved soil available nutrients in the 0-20 cm layer.These findings suggest that SS is an excellent practice for increasing soil carbon,nitrogen and nutrient availability in dryland wheat fields in North China.

关键词： tillage dryland wheat fields soil aggregate size soil nutrients soil carbon and nitrogen fractions

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Spatial-five coordination promotes the high efficiency of CoN_(4) moiety in graphene-based bilayer for oxygen reduction electrocatalysis: A density functional theory study

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Chinese Journal of Chemical Engineering 2023年第2期54卷 106-113页

作者： Libing Yu qiuyan huang Jing Wu Erhong Song Beibei Xiao School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China The State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

The searching of highly efficient catalysts for oxygen reduction reaction(ORR) has attracted particular attention. In this work, we construct the graphene-based bilayers BG/X that consists by the CoN_(4) embedded graphene as the upper layer and the X modified graphene as the bottom layer(X = Si, P, S). The interfacial bonding between CoN_(4) site and the X dopant is spontaneously formed due to the strong pd hybridization, which changes the Co ligand from the planar-four N_(4) coordination into spatial-five N_(4)+X one. The additive glue atom weakens too strong adsorptions of the ORR intermediates on CoN_(4) site and thereby improves the ORR activities in comparison with the monolayer counterpart. From the free energy profiles, the overpotentials η are 0.47, 0.49 and 0.45 V for BG/Si_(a), BG/P_(a) and BG/S_(a), respectively,being comparable to that of state-of-the-art Pt material. Besides, the kinetic barriers for the bilayers are less than 0.75 eV, an indicative of the room temperature activity. Furthermore, the combination of thermodynamic and kinetic analysis ensures the preference of 4e^(-)-OOH associative mechanism over 2e^(-)-H_(2)O_(2) mechanism, being beneficial for membrane stability against the H_(2)O_(2) corrosion. Therefore,the graphene-based bilayers deliver the high efficiencies for oxygen reduction electrocatalysis.Therefore, the interfacial bonding in the graphene-based bilayers provides an interesting strategy to suppress the poisoning phenomenon for the material design from atom scale.

关键词： Catalysts Oxygen reduction reaction(ORR) Graphene Thermodynamic Kinetic

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Effect of the microstructure parameters on the corrosion characteristics of Mg-Zn-Ca alloy with columnar structure

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Journal of Magnesium and Alloys 2023年第5期11卷 1709-1720页

作者： Yi Zhang Xiaohui Feng qiuyan huang Yingju Li Yuansheng Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shandong Key Laboratory for High Strength Lightweight Metallic Materials Ji’nan 250014China

Magnesium alloys with homogeneous degradation and controlled degradation rate are desirable for biodegradable materials.In the present work,Mg-3 wt.%Zn-0.2 wt.%Ca alloys with different columnar structures were fabricated and the degradation in 0.9 wt.%NaCl were investigated.With the increase of the growth rate for the directional solidification,the microstructure of the directionally solidified(DSed)alloy evolved from cellular to dendritic coupled with the change of the spacing of the primary trunks(λ_(1))and the volume fraction(fv)of Ca_(2)Mg_(6)Zn_(3) phase.The results of the corrosion test suggested that the alloy with cellular structure experienced homogeneous corrosion and exhibited the lowest corrosion rate.The good corrosion resistance of the alloy with cellular structure was attributed to the protective corrosion products film(CPF),which was closely related to the fv of Ca_(2)Mg_(6)Zn_(3) phase andλ_(1).To evaluate the corrosion rates(CR)of the DSed Mg-Zn-Ca alloys with different microstructures,a parameterαwas proposed in this work,which was calculated byλ_(1) and the fv of Ca_(2)Mg_(6)Zn_(3) phase.The fitting result showed that there was a linear relationship between CR andα,which was CR=4.1899+0.00432α.This means that the CR of the DSed Mg-Zn-Ca alloy can be evaluated if the microstructure had been characterized.

关键词： Mg-Zn-Ca alloy Directional solidification Microstructure Corrosion characterizations Corrosion rate

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Revealing the roles of TLR7, a nucleic acid sensor for COVID-19 in pan-cancer

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生物安全与健康(英文) 2023年第4期5卷 211-226页

作者： Zhijian huang Yaoxin Gao Yuanyuan Han Jingwen Yang Can Yang Shixiong Li Decong Zhou qiuyan huang Jialiang Yang Department of Breast Surgical Oncology Clinical Oncology School of Fujian Medical UniversityFujian Cancer HospitalFuzhou 350014China Biotherapy Center The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052China Institute of Medical Biology Chinese Academy of Medical Sciences and Peking Union Medical CollegeKunming 650000China Department of Clinical Pharmacy Clinical Oncology School of Fujian Medical UniversityFujian Cancer HospitalFuzhou 350014China Geriatric Hospital of Hainan Medical Education Department Haikou 571100China Geneis Beijing Co. LtdBeijing 100102China Qingdao Geneis Institute of Big Data Mining and Precision Medicine Qingdao 266000China

Recent studies suggested that cancer was a risk factor for coronavirus disease 2019 (COVID-19). Toll-like receptor 7 (TLR7), a severe acute respiratory syndrome 2 (SARS-CoV-2) virus’’s nucleic acid sensor, was discovered to be aberrantly expressed in many types of cancers. However, its expression pattern across cancers and association with COVID-19 has not been systematically studied. In this study, we proposed a computational framework to comprehensively study the roles of TLR7 in COVID-19 and pan-cancers at genetic, gene expression, protein, epigenetic, and single-cell levels. We found TLR7 mRNA expression was significantly up-regulated in 6 cancer types and down-regulated in 6 cancer types, further validated in the HPA database at the protein level. The genes significantly co-expressed with TLR7 were mainly enriched in the toll-like receptor signaling pathway, endolysosome, and signaling pattern recognition receptor activity. In addition, the abnormal TLR7 expression was associated with Mismatch repair (MMR), microsatellite instability (MSI), tumor mutational burden (TMB) in various cancers. Mined by the ESTIMATE algorithm, the expression of TLR7 was also closely linked to various immune infiltration patterns in pan-cancer, and TLR7 was mainly enriched in macrophages, as revealed by single-cell RNA sequencing. Finally, TLR7 expressions were very sensitive to a few targeted drugs, such as Alectinib and Imiquimod. In conclusion, TLR7 might be essential in the pathogenesis of COVID-19 and cancers.

关键词： COVID-19 TLR7 Pan-cancer SARS-CoV-2 Prognosis

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Dopant-vacancy activated tetragonal transition metal selenide for hydrogen evolution electrocatalysis

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Chinese Chemical Letters 2023年第7期34卷 249-255页

作者： qiuyan huang Xin Liu Ze Zhang Lianli Wang Beibei Xiao Zhimin Ao School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Materials Science and Engineering Xi'an University of Science and TechnologyXi'an 710054China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China

Hydrogen production from water electrolysis using renewable electricity is a highly promising route to solve the energy crisis of human society. The tetragonal 3d-transition metal selenide with metallic feature has been discovered to efficiently catalyze the hydrogen evolution electrocatalysis;however, its performance is still unsatisfactory and further improvement is necessary. Herein, the hydrogen evolution reaction of the functional tetragonal 3d-transition metal selenide with the heteroatom-dopant as well as cationic vacancy is fully investigated by means of density functional theory calculations. Our results identify 53 promising candidates endowed with good activity due to the absolute free energy of hydrogen adsorption |ΔGH| ≤ 0.30 eV wherein 15 candidates with |ΔG_H| ≤ 0.09 eV possess compelling performance in comparison with the benchmark Pt material. Interestingly, the functional CuSe systems account for 29out of 53 candidates, being high attractive for experimental synthesis. According to the analysis of electronic structure, the enhanced performance stems from the upshift of the sp orbitals, which benefits for the improved affinity toward hydrogen capture. This work provides new direction and guidance for the design of novel electrocatalysts.

关键词： Hydrogen evolution reaction Transition metal selenide Heteroatom-dopant Density functional theory calculations

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The corrosion characteristics and mechanism of directionally solidified Mg-3Zn-xCa alloys

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Journal of Magnesium and Alloys 2023年第10期11卷 3673-3687页

作者： Yi Zhang Xiaohui Feng qiuyan huang Yingju Li Xuehui Hao Changzheng Wang Yuansheng Yang Institute of Metal Research Chinese Academy of Scienceswenhua road 72Shenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China

An investigation into the corrosion characteristics and mechanism of directionally solidified(DSed) Mg-3Zn-xCa(x = 0, 0.2, 0.5,0.8 wt.%) alloys in 0.9 wt.% Na Cl solution is presented. The DSed microstructure consists of columnar dendrites and eutectics distributed in the interdendritic region. The primary dendritic arm spacing(PDAS) and the volume fraction(fv) of the secondary phases are under the significant impact of the content of Ca. The corrosion rates evaluated using electrochemical measurements and immersion tests are accelerated monotonously with the increase of Ca content in DSed alloys. The corrosion resistance of the DSed alloys is significantly affected by the corrosion products film(CPF) and the secondary phases. The corrosion products of DSed Mg-3Zn alloy contain Mg(OH)_(2) and ZnO. The existence of ZnO greatly enhances the corrosion resistance of DSed Mg-3Zn alloy. As for the DSed alloys containing Ca content, a relatively protective CPF without deep pits can form on the surface of DSed Mg-3Zn-0.2Ca specimen during the corrosion. The f_(v)of the secondary phases dominates the corrosion rate of the DSed Mg-Zn-Ca alloys. The corrosion of DSed Mg-3Zn-xCa alloys initiates as a result of microgalvanic coupling between the cathodes of secondary phases and α-Mg matrix anode. Then, the corrosion gradually extends longitudinally with the breakdown of CPF.

关键词： Mg-Zn-Ca alloy Directional solidification Electrochemical characterization Corrosion mechanism

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Low-cost and high-strength Mg-Al-Ca-Zn-Mn wrought alloy with balanced ductility

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1396-1405页

作者： Kun Yang Hucheng Pan Sen Du Man Li Jingren Li Hongbo Xie qiuyan huang Huajun Mo Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China The First Sub-Institute Nuclear Power Institute of ChinaChengdu 610005China

A novel low-cost Mg-Al-Ca-Zn-Mn-based alloy was developed to simultaneously improve its strength and ductility.The high yield strength of 411 MPa and the high elongation to failure of~8.9%have been achieved in the as-extruded Mg-1.3Al-1.2Ca-0.5Zn-0.6Mn(wt%)sample.Microstructure characterizations showed that the high strength is mainly associated with the ultra-fined dynamically recrystallized(DRXed)grains.Moreover,high-density dislocations in the un-DRXed region and nano-precipitates are distributed among theα-Mg matrix.The high ductility property can be ascribed to the high volume fraction of DRXed grains with a much randomized texture,as well as the formations of high-density subgrains in the un-DRXed grain regions.

关键词： Mg wrought alloy mechanical property dynamic recrystallization texture nano-precipitation

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Residual stress and precipitation of Mg-5Zn-3.5Sn-1Mn-0.5Ca-0.5Cu alloy with different quenching rates

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Journal of Magnesium and Alloys 2021年第2期9卷 604-612页

作者： Cong Wang Tianjiao Luo Yunteng Liu qiuyan huang Yuansheng Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shandong Key Laboratory for High Strength Lightweight Metallic Materials Advanced Materials InstituteShandong Academy of SciencesShandong 250014China

The effect of the quenching rate after solution treatment on the residual stress and precipitation behavior of a high strength Mg-5 Zn-3.5 Sn-1 Mn-0.5 Ca-0.5 Cu plate is studied.The simulation results show decreasing temperature gradient in the plate with decreasing quenching rate,which leads to weakened inhomogeneous plastic deformation and decreased residual stress.No dynamic precipitation on the grain boundary happens after either cold water cooling or air cooling,however,air cooling leads to dynamic precipitation of Mg-Zn phase on Mn particles around which a low-density precipitate zone develops after aging treatment.Moreover,the fine and densely distributed Mg-Zn precipitates observed after aging treatment of the cold water cooled alloy are replaced by coarse precipitates with low density for the air cooled alloy.Both the low-density precipitate zone near Mn particles and the coarsening of precipitates are the source of the decrease in hardness and tensile properties of the air cooled alloy.The residual stress drops faster than the hardness with decreasing quenching rate,which makes it possible to lower the residual stress without sacrificing too much age-hardening ability of the alloy.

关键词： Mg-5Zn-3.5Sn-1Mn-0.5Ca-0.5Cu alloy Solution treatment Quenching rate Residual stress Precipitation Age-hardening

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身体美学的他者导向与环境伦理学的建构——从生命多样性谈起

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福建论坛（人文社会科学版） 2024年第3期 80-89页

作者：王晓华黄秋燕深圳大学人文学院

作为知行合一的学术流派,身体美学在诞生之初就重视学术的道德关怀功能,强调自己具有“对更好生活的伦理学追求”,通过倡导“他者导向的身体美学”,反思、解构“自然/文化”的二分法,呼吁人们欣赏“环境中的他者”乃至整个宇宙的丰富性... 详细信息

作为知行合一的学术流派,身体美学在诞生之初就重视学术的道德关怀功能,强调自己具有“对更好生活的伦理学追求”,通过倡导“他者导向的身体美学”,反思、解构“自然/文化”的二分法,呼吁人们欣赏“环境中的他者”乃至整个宇宙的丰富性。在这个过程中,一种重视生命多样性的概念框架已经成形。当舒斯特曼将身体定义为感觉-审美活动的中心时,他已经开始重视人类(作为有机体)与其他生命形态(不同于人的有机体)的关系;通过强调对于环境的灵敏性,身体美学实际上发展出了体验生命多样性的实践方案;在提出“共生的身体”这个概念以后,身体美学已经生发出其“回报-感恩万物”的环境伦理学,开始引导人们参与守护生命多样性的实践。

关键词：身体美学他者导向环境伦理学生命多样性守护

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数字经济对农民工就业质量的影响机制分析

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调研世界 2024年第2期 42-51页

作者：潘海岚黄秋妍云南民族大学经济学院

本文在系统梳理数字经济对劳动力市场作用机制基础上,采用2020年中国家庭追踪调查(CFPS)数据和全国25个省(市、自治区)数据进行匹配,以探究数字经济发展对农民工就业质量的影响。研究发现,数字经济能显著提升农民工就业质量,具体表现为... 详细信息

本文在系统梳理数字经济对劳动力市场作用机制基础上,采用2020年中国家庭追踪调查(CFPS)数据和全国25个省(市、自治区)数据进行匹配,以探究数字经济发展对农民工就业质量的影响。研究发现,数字经济能显著提升农民工就业质量,具体表现为减少劳动时间、改善福利保障和提高工作满意度,但对其工资收入和工作稳定性呈负向影响。进一步分析表明,数字经济可通过推动产业结构高级化和提升信息获取便利度赋能农民工高质量就业,且该作用存在行业异质性。据此建议,优化数字经济平台,完善薪酬保障和支付体系;注重数字技术推广,建立就业信息平台;推动公平就业机会和福利保障,促进行业间协同发展。

关键词：数字经济农民工就业质量

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