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AMMONIA DISPERSION FROM MULTI-FLOOR VERSUS STANDARD SINGLE-FLOOR PIG PRODUCTION FACILITIES BASED ON COMPUTATIONAL FLUID DYNAMICS SIMULATIONS

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Frontiers of Agricultural Science and Engineering 2023年第3期10卷 374-389页

作者： Yicong XIN Li RONG Gunther SCHAUBERGER dejia liu Xiusong LI Zhihua YANG Songming ZHU Dezhao liu Key Laboratory of Equipment and Informatization in Environment Controlled Agriculture Ministry of Agriculture and Rural AffairsKey Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang ProvinceInstitute of Agricultural Bio-Environmental EngineeringCollege of Biosystems Engineering and Food ScienceZhejiang UniversityHangzhou 310058China Department of Civil and Architectural Engineering—Building Science Aarhus UniversityAarhus C 8000Denmark WG Environmental Health Unit for Physiology and BiophysicsUniversity of Veterinary MedicineA-1210 ViennaAustria Big Herdsman Machinery Co. Ltd.Qingdao 266000China Zhejiang Huatong Meat Products Co. Ltd.Yiwu 322000China

Multi-floor buildings for raising pigs have recently attracted widespread attention as an emerging form of intensive livestock production especially in eastern China,due to the fact that they can feed a much larger number of animals per unit area of land and thus alleviate the shortage of land available for standard single-floor pig production ***,this more intensive kind of pig building will pose new challenges to the local environment in terms of pollutant *** compare the dispersion air pollutants(ammonia as a representative)emitted from multi-versus single-floor pig buildings,ammonia dispersion distance and concentration gradients were investigated through three-dimensional simulations based on computational fluid *** validation of an isolated cubic model was made to ensure the simulation method was *** effects of wind direction,wind speed and emission source concentration at 1.5 m(approximate human inhalation height)during summer were *** results showed that the ammonia dispersion distance of the multi-floor pig building was far greater than that of the single-floor building on a plane of Z=1.5 *** the wind direction was 67.5°,the wind speed was 2 m·s^(−1) and the emission source concentration was 20 ppmv,the dispersion distance of the multi-floor pig building could reach 1380 ***,the ammonia could accumulate in the yard to 7.68 ***,future site selection,wind speed and source concentration need to be given serious *** on the simulation used in this study with source concentration is 20 ppmv,the multi-floor pig buildings should be located 1.4 km away from residential areas to avoid affecting *** results of this study should guidance for any future development of multi-floor pig buildings.

关键词： pig building computational fluid dynamics ammonia dispersion

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Influence of texture distribution in magnesium welds on their non-uniform mechanical behavior:A CPFEM study

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Journal of Materials Science & Technology 2020年第11期42卷 168-176页

作者： Weijie Ren dejia liu Qing liu Renlong Xin Joint International Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China College of Materials Science and Engineering East China Jiaotong UniversityNanchang3300J3China Key Laboratory for Light-weight Materials NanjingTech UniversityNanjing211816China

Recent studies indicate that the texture distribution in friction stir welded(FSW)Mg alloys can be tailored and hence improve the joint *** this work,a crystal plasticity finite element modeling(CPFEM)was performed to understand the effects of texture distribution in stir zone(SZ)on the nonuniform plastic deformation and fracture *** total,six kinds of observed or purposely tilted texture distributions were ***"concave-convex"appearance,as commonly observed in the tensile sample,was successfully *** reveals that the mirror-symmetrical distribution of basal planes in the region of easy to activate basal slip(EABS)determined the"concave-convex"appearance in *** asymmetrical appearance exchanged on plane A and plane B when the directions of basal planes were switched in the two EABS ***,the asymmetrical feature of plastic deformation was changed with varying the texture distribution in ***"embossed"feature became more obvious in SZ-center first,and then gradually weakened with the c-axis rotated away from the weld plate *** necking was successfully simulated in SZ-center of FSW-H joint and in SZ-side of FSW-L *** might determine the observed fracture *** believe that this simulation study is helpful for further improving the performance of FSW Mg joints.

关键词： Friction stir welding Magnesium alloy CPFEM Non-uniform deformation Fracture

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Response of maize growth and soil biological characteristics to planting density under fertigation in a semi-arid region

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International Journal of Agricultural and Biological Engineering 2024年第2期17卷 186-192页

作者： Peng Jiang Lei Li dejia Xu Rui Wang Quan Sun School of Forestry and Prataculture Ningxia UniversityYinchuan 750021China Institute of Agricultural Resources and Environment Ningxia Academy of Agriculture and Forestry SciencesYinchuan 750002China School of Agriculture Ningxia UniversityYinchuan 750021China

Increasing the planting density can exacerbate crop competition for water,nutrients and space which results in a decline in the crop ***,the effect of increasing planting density on crop growth and soil biological characteristics in barren sandy land in the semi-arid regions are still *** this study,we investigated the effects of six planting densities(5.4×10^(4),6.45×10^(4),7.95×10^(4),9.5×10^(4),9.75×10^(4) and 10.5×10^(4) plants/hm^(2))on maize growth,photosynthesis characteristics,yield and soil biological characteristics in barren sandy soil in the semi-arid region of Ningxia,*** results indicated that the stem diameter and spike length decreased linearly with increasing planting *** plant height,spike weight,grain weight and 100-grain weight decreased with increasing plating ***,the root length increased with increasing planting *** diameter,volume and activity increased and then decreased with increasing planting *** was no significant difference(p>0.05)in the effect of planting density on transpiration rate intercellular CO_(2) *** well,the soil microbial biomass carbon and microbial biomass nitrogen decreased with increasing planting *** soil catalase activities increased and then decreased with increasing planting *** alkaline phosphatase activity,the amounts of soil bacteria and actinomycetes increased with increasing planting ***,a moderately increasing planting density can improve maize yield when water and nutrients are *** optimal planting density was 8.29×10^(4) plants/hm^(2) and the highest yield was 15.84 t/hm^(2) in barren sandy soil in semi-arid region of Ningxia,*** study provides a theoretical basis for high yield and high efficiency of maize.

关键词： maize growth planting density yield fertigation soil enzyme activity

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数字化发展对先进制造企业服务创新的影响研究——基于企业动态能力视角

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中国软科学 2023年第3期 150-161页

作者：张昊刘德佳哈尔滨理工大学经济与管理学院黑龙江哈尔滨150040 哈尔滨工程大学经济管理学院黑龙江哈尔滨150001

在数字经济时代背景下,数字化发展已成为推动先进制造企业迈向高端价值链的有效路径。基于中国A股上市公司2015—2021年的数据,研究数字化发展对先进制造企业服务创新的影响及内在作用机制。结果表明:数字化发展能够促进先进制造企业服... 详细信息

在数字经济时代背景下,数字化发展已成为推动先进制造企业迈向高端价值链的有效路径。基于中国A股上市公司2015—2021年的数据,研究数字化发展对先进制造企业服务创新的影响及内在作用机制。结果表明:数字化发展能够促进先进制造企业服务创新;企业动态能力在数字化发展与先进制造企业服务创新的关系中起中介作用;非沉淀性冗余资源在企业动态能力与服务创新之间起正向调节作用,而沉淀性冗余资源在企业动态能力与服务创新之间起负向调节作用。研究结论以期为先进制造企业服务创新理论研究与实践探索提供重要依据。

关键词：服务创新先进制造企业数字化发展企业动态能力冗余资源

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Enhanced fluorescence sensing of tetracycline with Ti_(2)C quantum dots

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Nano Research 2024年第4期17卷 3180-3188页

作者： dejia Hu ShangZuo Jiang Tianhao Xia Danyang Xiao Yan Li Yanbing Hou Jin Zhong Zhang Ying-Chih Pu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Key Lab Luminescence&Optical Information Ministry EducationBeijing JiaoTong UniversityBeijing 100044China Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCalifornia 95064USA Department of Materials Science "National University of Tainan"Tainan 700301TaiwanChina

Ti_(2)C quantum dots(QDs)with rich surface functional groups have been synthesized using a hydrothermal method,and used to detect tetracycline(Tc)based on enhanced *** interaction between the surface functional groups of Ti_(2)C QDs and Tc enhanced the fluorescence of Tc at 514 nm,which is used to detect Tc quickly and *** optimal conditions,the fluorescence intensity was linear to the concentration of Tc in the range of 50.0–30.0μM,with a detection limit of 21.6 ***,the Tc-Ti_(2)C QDs detection system was evaluated for detection of Tc in milk and artificial *** study demonstrates a new and simple strategy for Tc detection,which is important for food safety and human health.

关键词： Ti_(2)C MXene quantum dots tetracycline fluorescence enhancement detection

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Advances in the kinetics of heat and mass transfer in near-continuous complex flows

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Frontiers of physics 2024年第4期19卷 187-234页

作者：许爱国张德佳甘延标 National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009-26Beijing 100088China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China National Key Laboratory of Shock Wave and Detonation Physics Mianyang 621999China Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle School of Liberal Arts and SciencesNorth China Institute of Aerospace EngineeringLangfang 065000China

The study of macro continuous flow has a long ***,the exploration of heat and mass transfer in small systems with a particle number of several hundred or less has gained significant interest in the fields of statistical physics and nonlinear ***,due to absence of suitable methods,the understanding of mesoscale behavior situated between the aforementioned two scenarios,which challenges the physical function of traditional continuous fluid theory and exceeds the simulation capability of microscopic molecular dynamics method,remains considerably *** greatly restricts the evaluation of effects of mesoscale behavior and impedes the development of corresponding regulation *** access the mesoscale behaviors,there are two ways:from large to small and from small to *** the necessity to interface with the prevailing macroscopic continuous modeling currently used in the mechanical engineering community,our study of mesoscale behavior begins from the side closer to the macroscopic continuum,that is from large to *** on some fundamental challenges encountered in modeling and analysis of near-continuous flows,we review the research progress of discrete Boltzmann method(DBM).The ideas and schemes of DBM in coarse-grained modeling and complex physical field analysis are *** relationships,particularly the differences,between DBM and traditional fluid modeling as well as other kinetic methods are *** verification and validation of the method,some applied researches including the development of various physical functions associated with discrete and non-equilibrium effects are *** directions of DBM related studies are indicated.

关键词： near-continuous flow non-equilibrium kinetics discrete Boltzmann method complex physical field analysis

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AlMgLi_(0.5) Zn_(0.5) Cu_(0.2)轻质高熵合金的组织和耐腐蚀性研究

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材料导报 2022年第14期36卷 39-44页

作者：胡勇刘飞刘员员赵龙志焦海涛唐延川刘德佳华东交通大学材料科学与工程学院南昌330013 南昌市载运工具先进材料与激光增材制造重点实验室南昌330013

采用Al、Mg、Li、Cu、Zn五种元素,通过磁悬浮熔炼制备了AlMgLi_(0.5) Zn_(0.5) Cu_(0.2)轻质高熵合金。利用XRD、SEM分析了热处理对AlMgLi_(0.5) Zn_(0.5)-Cu_(0.2)轻质高熵合金微观组织形貌的影响。利用ES-D电子天平和CS350电化学工作... 详细信息

采用Al、Mg、Li、Cu、Zn五种元素,通过磁悬浮熔炼制备了AlMgLi_(0.5) Zn_(0.5) Cu_(0.2)轻质高熵合金。利用XRD、SEM分析了热处理对AlMgLi_(0.5) Zn_(0.5)-Cu_(0.2)轻质高熵合金微观组织形貌的影响。利用ES-D电子天平和CS350电化学工作站检测了AlMgLi_(0.5) Zn_(0.5) Cu_(0.2)轻质高熵合金的密度和耐腐蚀性。结果表明:AlMgLi_(0.5) Zn_(0.5) Cu_(0.2)轻质高熵合金的密度为2.851 g/cm^(3)。经过热处理后,AlMgLi_(0.5) Zn_(0.5) Cu_(0.2)轻质高熵合金晶界处含Mg_(32)(AlZn)_(49)相的共晶组织减少,形貌由条状变为点状。经过300℃热处理以后,FCC1相枝晶组织细化且变得更加均匀;FCC1相中的Cu元素固溶到基体内,提高了合金的耐腐蚀性能。但是经过300℃+120℃热处理后,FCC1相变为等轴状,FCC1基体表面有FCC2(富Cu相)析出,构成了微小腐蚀电池,降低了合金的耐腐蚀性能。

关键词：轻质高熵合金 AlMgLi 0.5 Zn 0.5 Cu 0.2 显微组织耐腐蚀性

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原位TiC-TiB_(2)/Al-12Si混杂铝基复合材料组织及耐腐蚀性能研究

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稀有金属材料与工程 2022年第10期51卷 3937-3942页

作者：胡勇刘员员符声启赵龙志焦海涛刘德佳唐延川华东交通大学材料科学与工程学院江西南昌330013

采用激光沉积制备了原位TiC-TiB_(2)/Al-12Si混杂铝基复合材料,通过XRD、OM、SEM、TEM和电化学测试分析了复合材料的微观组织和耐蚀性能。结果表明,原位TiC为细小弥散分布的多边形状、TiB_(2)为短棒状,两者均可作为Al的异质形核核心而... 详细信息

采用激光沉积制备了原位TiC-TiB_(2)/Al-12Si混杂铝基复合材料,通过XRD、OM、SEM、TEM和电化学测试分析了复合材料的微观组织和耐蚀性能。结果表明,原位TiC为细小弥散分布的多边形状、TiB_(2)为短棒状,两者均可作为Al的异质形核核心而细化晶粒。在3.5%NaCl溶液中,随着原位TiC-TiB_(2)增强相含量的增加,复合材料的自腐蚀电位正移,自腐蚀电流密度降低,阻抗模量值及相位角值增大,表明复合材料的耐蚀性增强。

关键词：原位 TiC-TiB_(2) 混杂铝基复合材料显微组织耐腐蚀性能

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先进制造企业服务创新转型演进逻辑及驱动机制研究——基于企业资源与能力视角

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科研管理 2023年第8期44卷 47-56页

作者：李庆雪綦天熠王莉静刘德佳哈尔滨理工大学经济与管理学院黑龙江哈尔滨150040 哈尔滨工程大学经济管理学院黑龙江哈尔滨150001

服务创新作为先进制造业转型升级新业态,是塑造先进制造业竞争优势的新引擎,先进制造企业服务创新转型演进的相关理论研究,成为学术界亟待突破的重要难题。本文基于企业资源与能力视角,运用多案例研究方法,在扎根理论编码分析基础上,厘... 详细信息

服务创新作为先进制造业转型升级新业态,是塑造先进制造业竞争优势的新引擎,先进制造企业服务创新转型演进的相关理论研究,成为学术界亟待突破的重要难题。本文基于企业资源与能力视角,运用多案例研究方法,在扎根理论编码分析基础上,厘清先进制造企业服务创新转型演进逻辑及驱动机制。研究发现:第一,先进制造企业服务创新转型经历“传统制造服务创新阶段-全生命周期管理服务创新阶段-智能制造服务数字化创新阶段”演化,并遵循“资源与能力提升-内外要素驱动-转型阶段演进”的服务创新转型演进逻辑;第二,服务创新转型各阶段需要依次满足资源的“利用开发-整合配置-智能优化”以及“服务认知-服务响应-动态服务创新”能力的提升条件;第三,先进制造企业分别受到服务价值及动态竞争环境、服务生态发展及服务效益、服务集成创新需求及服务反馈机制等内外要素共同驱动作用,促进服务创新转型演进与升级。研究旨在丰富服务创新转型的相关研究,并为先进制造业服务创新战略演进提供理论指导。

关键词：服务创新演进逻辑驱动机制企业资源企业能力

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超声辅助激光沉积原位TiC-TiB_(2)/Al-12Si铝基复合材料微观组织及摩擦磨损行为研究

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稀有金属材料与工程 2022年第12期51卷 4632-4639页

作者：赵明娟胡勇符声启赵龙志焦海涛刘德佳唐延川华东交通大学材料科学与工程学院江西南昌330013 华东交通大学南昌市载运工具先进材料与激光增材制造重点实验室江西南昌330013

以Ti、B_(4)C和Al-12Si粉末为原材料,通过超声辅助激光沉积制备了原位TiC-TiB_(2)/Al-12Si铝基复合材料。采用XRD、EDS分析了复合材料的物相组成,通过OM、SEM观察了复合材料的微观组织,利用摩擦磨损试验机和三维轮廓仪测试了复合材料的... 详细信息

以Ti、B_(4)C和Al-12Si粉末为原材料,通过超声辅助激光沉积制备了原位TiC-TiB_(2)/Al-12Si铝基复合材料。采用XRD、EDS分析了复合材料的物相组成,通过OM、SEM观察了复合材料的微观组织,利用摩擦磨损试验机和三维轮廓仪测试了复合材料的磨损性能。结果表明,随Ti+B_(4)C含量的增加,α-Al晶粒细化,原位生成的TiB_(2)呈棒状,且可成为α-Al的异质形核核心;原位生成的TiC为150nm多边形形貌。随Ti+B_(4)C含量的增加,原位TiC-TiB_(2)/Al-12Si铝基复合材料的耐磨性提高;未加入Ti+B_(4)C的Al-12Si合金磨损机制为疲劳磨损;当Ti+B_(4)C的加入量为8%(质量分数)时,磨损机制为磨粒磨损;当Ti+B_(4)C的加入量为10%时,其磨损机制转变为疲劳磨损。

关键词：激光沉积原位自生 TiC-TiB_(2) 铝基复合材料摩擦磨损

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