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Volume-averaged modeling of multiphase solidification with equiaxed crystal sedimentation in a steel ingot

China Foundry 2024年第3期21卷 229-238页

作者： Xiao-lei Zhu Shuang Cao Rui Guan Ji Yang Zhe Ning Xin-gang Ai sheng-li li Xin-cheng Miao The key Laboratory of Material Forming and Structure Property Control Anshan 114051LiaoningChina State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009LiaoningChina School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

Macrosegregation is a critical factor that limits the mechanical properties of *** impact of equiaxed crystal sedimentation on macrosegregation has been extensively studied,as it plays a significant role in determining the distribution of alloying elements and impurities within a *** improve macrosegregation in steel connecting shafts,a multiphase solidification model that couples melt flow,heat transfer,microstructure evolution,and solute transport was established based on the volume-averaged Eulerian-Eulerian *** this model,the effects of liquid phase,equiaxed crystals,columnar dendrites,and columnar-to-equiaxed transition(CET)during solidification and evolution of microstructure can be considered *** sedimentation of equiaxed crystals contributes to negative macrosegregation,where regions between columnar dendrites and equiaxed crystals undergo significant A-type positive macrosegregation due to the ***,noticeable positive macrosegregation occurs in the area of final solidification in the *** improvement in macrosegregation is beneficial for enhancing the mechanical properties of connecting *** mitigate the thermal convection of molten steel resulting from excessive superheating,reducing the superheating during casting without employing external fields or altering the design of the ingot mold is indeed an effective approach to control macrosegregation.

关键词： ingot casting multiphase solidification model equiaxed crystal sedimentation microstructure macrosegregation

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在线分析仪在盐水系统中的应用

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中国氯碱 2024年第3期 29-35,64页

作者：李胜利张友平陕西北元化工集团股份有限公司化工分公司陕西榆林

介绍了盐水系统2035系列在线分析仪的原理、分析步骤以及优化改进措施,并论证了仪器的可靠性。

关键词：在线分析仪钙镁含量过碱量游离氯含量优化改进可行性论证

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新农科背景下设施农业科学与工程专业的实践教学体系研究

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教育教学论坛 2024年第14期 105-108页

作者：李严曼陈菲李胜利河南农业大学园艺学院河南郑州450046 河南农业职业学院园艺园林学院河南郑州451450

随着产业的发展,对于人才的要求也在不断提高。实践教学在应用型人才培养的过程中起着至关重要的作用,是培养学生动手和创新能力的重要途径,尤其是对于应用性较强的设施农业科学与工程专业。通过对该专业实践教学中的一些问题进行分析,... 详细信息

随着产业的发展,对于人才的要求也在不断提高。实践教学在应用型人才培养的过程中起着至关重要的作用,是培养学生动手和创新能力的重要途径,尤其是对于应用性较强的设施农业科学与工程专业。通过对该专业实践教学中的一些问题进行分析,然后从课程教材建设、教学基地、教学团队、教学方式、教学评价等几个方面对实践教学体系优化进行探讨,希望可以提高学生的实践动手能力,提高人才培养质量,增强毕业生就业竞争力,适应新农科发展需要。

关键词：设施农业科学与工程新农科人才培养实践教学

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Boosting reversible charging of li-ion batteries at low temperatures by a synergy of propylene carbonate-based electrolyte and defective graphite

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Nano Research 2024年第3期17卷 1491-1499页

作者： Yingqiang Wu Jiao Zhang Jinli liu li sheng Bo Zhang limin Wang Siqi Shi li Wang Hong Xu Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences(CAS)Changchun 130022China China National Quality Supervision and Inspection Center for Industrial Explosive Materials Nanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Materials Genome InstituteShanghai UniversityShanghai 200444China

Propylene carbonate(PC)-based electrolytes have exhibited significant advantages in boosting the low-temperature discharging of graphite-based li-ion ***,it is still unclear whether they can improve the charging property and suppress lithium *** this topic is challenging due to the problem of electrochemical *** overcome this issue,we introduced graphite with phase *** results show that the pouch-type full batteries using PC-based electrolyte exhibit steady performance over 500 cycles and can be reversibly charged over 30 times at-20℃ with an average Coulombic efficiency of 99.95%,while the corresponding value for the conventional ethylene carbonate(EC)-based electrolyte sample is only 31.20%.This indicates that the use of PC-based electrolyte significantly suppresses lithium plating during low-temperature *** further demonstrate that the improved performance is mainly attributed to the unique solvation structure,where PF-6more anions participate in solvation,leading to the formation of a stable F-rich solid state electrolyte interface on the graphite surface and a lower reduction tendency of li+*** work inspires new ideas for the design of PC-based electrolytes for low-temperature charging and fast-charging batteries.

关键词： lithium-ion batteries graphite propylene carbonate low-temperature charging

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玉米青贮的加工处理评分方法的研究

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饲料研究 2024年第11期47卷 77-81页

作者：金鹿李胜利张春华张崇志萨初拉刘威王博孙海洲内蒙古自治区农牧业科学院动物营养与饲料研究所内蒙古自治区草食动物营养科学重点实验室农业农村部草食家畜健康养殖与畜产品品质调控重点实验室(部省共建)内蒙古呼和浩特010031

试验验证了使用振筛仪快速评价玉米青贮加工处理评分这一方法的准确性。研究参考了美国农业部粗饲料研究中心的Dave Mertens博士提出的玉米青贮的加工处理评分方法,对8个不同牧场或牧户制作的玉米青贮样品进行了测定。结果表明,玉米青... 详细信息

试验验证了使用振筛仪快速评价玉米青贮加工处理评分这一方法的准确性。研究参考了美国农业部粗饲料研究中心的Dave Mertens博士提出的玉米青贮的加工处理评分方法,对8个不同牧场或牧户制作的玉米青贮样品进行了测定。结果表明,玉米青贮样品通过4.75 mm分级筛的比例范围为59.76%~75.26%,加工处理评分等级均为一般和优良。研究表明,此评分方法能够为评价玉米青贮的饲用价值提供了一种便捷、快速的分析方法。

关键词：玉米青贮加工处理评分玉米籽粒破碎程度

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围产期母畜低血钙症的钙代谢机制及对相关代谢疾病的影响

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饲料研究 2024年第3期47卷 132-137页

作者：义拉勒特金鹿张春华萨初拉李胜利张崇志刘威孙海洲内蒙古农业大学动物科学学院内蒙古呼和浩特010018 内蒙古自治区农牧业科学院、内蒙古自治区草食动物营养科学重点实验室、农业农村部草食家畜健康养殖与畜产品品质调控重点室(部省共建) 内蒙古呼和浩特010031

围产期母畜由于体内蛋白质、矿物质和能量代谢的急剧变化,容易导致钙的流失和平衡失调,进而引发母畜围产期低血钙症。临床和亚临床低血钙症不仅能够影响母畜的生产性能,还会影响围产期机体的营养代谢,进一步诱发母畜在围产期出现其他生... 详细信息

围产期母畜由于体内蛋白质、矿物质和能量代谢的急剧变化,容易导致钙的流失和平衡失调,进而引发母畜围产期低血钙症。临床和亚临床低血钙症不仅能够影响母畜的生产性能,还会影响围产期机体的营养代谢,进一步诱发母畜在围产期出现其他生理变化和疾病,如酮病、皱胃移位、难产、乳腺炎及子宫疾病等。因此,全面深入地研究围产期母畜低血钙症的钙代谢机制及其对相关代谢疾病的影响,对于保障围产期母畜的健康和提高生产性能具有重要意义。文章详述了围产期母畜低血钙症的病因和现状、钙代谢机制、综合防治措施以及与其他疾病之间的关联,为降低围产期母畜低血钙症发病率以及改善饲养管理提供参考。

关键词：围产期母畜低血钙症钙代谢代谢疾病

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Perception of fundamental science to boost lithium metal anodes toward practical application

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Green Energy & Environment 2024年第3期9卷 454-472页

作者： Jinkun Wang li Wang Hong Xu li sheng Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China

As a key material for lithium metal batteries(LMBs),lithium metal is one of the most promising anode materials to break the bottleneck of battery energy density and a commonly used active material for reference *** lithium anodes are regarded as the holy grail of lithium batteries,decades of exploration have not led to the successful commercialization of LMBs,due mainly to the challenges related to the inherent properties of lithium *** pave the way for further investigation,herein,a comprehensive review focusing on the fundamental science of lithium are ***,the natures of lithium atoms and their isotopes,lithium clusters and lithium crystals are revisited,especially their structural and energetic ***,the electrochemical properties of lithium metal are *** important concepts and scientific questions,including the electronic structure of lithium,influence of high pressure and low temperature on the properties of lithium,factors influencing lithium deposition,generation of lithium dendrites,and electrode potential of lithium in different electrolytes,are explained and analyzed in *** to improve the performance of lithium anodes and thoughtfulness about the electrode potential in lithium battery research are proposed.

关键词： lithium Cluster Crystal Physicochemical property Fundamental science

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Incorporating contextual evidence to improve implicit discourse relation recognition in Chinese

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Frontiers of Computer Science 2024年第3期18卷 91-104页

作者： sheng XU Peifeng li Qiaoming ZHU School of Computer Science and Technology Soochow UniversitySuzhou 215000China

The discourse analysis task,which focuses on understanding the semantics of long text spans,has received increasing attention in recent *** a critical component of discourse analysis,discourse relation recognition aims to identify the rhetorical relations between adjacent discourse units(e.g.,clauses,sentences,and sentence groups),called arguments,in a *** works focused on capturing the semantic interactions between arguments to recognize their discourse relations,ignoring important textual information in the surrounding ***,in many cases,more than capturing semantic interactions from the texts of the two arguments are needed to identify their rhetorical relations,requiring mining more contextual *** this paper,we propose a method to convert the RST-style discourse trees in the training set into dependency-based trees and train a contextual evidence selector on these transformed *** this way,the selector can learn the ability to automatically pick critical textual information from the context(i.e.,as evidence)for arguments to assist in discriminating their *** we encode the arguments concatenated with corresponding evidence to obtain the enhanced argument ***,we combine original and enhanced argument representations to recognize their *** addition,we introduce auxiliary tasks to guide the training of the evidence selector to strengthen its selection *** experimental results on the Chinese CDTB dataset show that our method outperforms several state-of-the-art baselines in both micro and macro F1 scores.

关键词： discourse parsing discourse relation recognition contextual evidence selection

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Traveling Wave Characteristics Based Pilot Protection Scheme for Hybrid Cascaded HVDC Transmission line

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 971-980页

作者： Dalin Mu sheng lin Xiaopeng li the School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China the State Grid Sichuan Electric Power Research Institute Chengdu 610041China

The hybrid cascaded high-voltage direct current(HVDC)transmission system has various operation modes,and some operation modes have sharply increasing requirements for protection rapidity,while the traditional pilot differential protection(PDP)has poor rapidity,and even refuses to operate when faults occur on the DC ***,a novel pilot protection scheme based on traveling wave characteristics is ***,the adaptability of the traditional PDP applied in engineering is analyzed for different operation ***,the expressions of the forward traveling wave(FTW)and backward traveling wave(BTW)on the rectifier side and the inverter side are derived for different fault *** the theoretical derivation,the difference between the BTW and FTW on the rectifier side is less than zero,and the same is true on the inverter ***,in the event of an external fault of DC line,the difference between the BTW and FTW at nearfault terminal protection installation point is greater than ***,by summing over the product of the difference between BTW and FTW of the rectifier side and that of the inverter side,the fault identification criterion is *** simulation results show that the proposed pilot protection scheme can quickly and reliably identify the short-circuit faults of DC line in different operation modes.

关键词： Hybrid cascaded high-voltage direct current(HVDC)transmission system DC line operation mode pilot protection

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Gut microbiota intervention attenuates thermogenesis in broilers exposed to high temperature through modulation of the hypothalamic 5‑HT pathway

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Journal of Animal Science and Biotechnology 2024年第2期15卷 679-698页

作者： sheng li Xiaoqing li Kai Wang Yansen li Kentaro Nagaoka Chunmei li Research Centre for livestock Environmental Control and Smart Production College of Animal Science and TechnologyNanjing Agricultural UniversityNanjing 210095China Laboratory of Veterinary Physiology Department of Veterinary MedicineFaculty of AgricultureTokyo University of Agriculture and TechnologyTokyo 183‑8509Japan

Background Broilers have a robust metabolism and high body temperature,which make them less tolerant to hightemperature(HT)environments and more susceptible to challenges from elevated *** microbes,functioning as symbionts within the host,possess the capacity to significantly regulate the physiological functions and environmental adaptability of the *** study aims to investigate the effects of gut microbial intervention on the body temperature and thermogenesis of broilers at different ambient temperatures,as well as the underlying mechanism involving the"gut-brain"*** Broilers were subjected to gut microbiota interference with or without antibiotics(control or ABX)starting at 1 day of *** 21 day of age,they were divided into 4 groups and exposed to different environments for 7 d:The control and ABX groups at room temperature(RT,24±1℃,60%relative humidity(RH),24 h/d)and the control-HT and ABX-HT groups at high temperature(HT,32±1℃,60%RH,24 h/d).Results The results demonstrated that the antibiotic-induced gut microbiota intervention increased body weight and improved feed conversion in broiler chickens(Pliver(Plistipes was enriched in control *** contrast,antibioticinduced gut microbiota intervention resulted in a decrease in the relative abundance of Alistipes(P<0.05).Moreover,this difference was accompanied by increased hypothalamic 5-hydroxytryptamine(5-HT)content and TPH2 expression(P<0.05).Conclus

关键词： 5-HT Broiler chickens Gut microbiota Thermogenesis Thermoregulation

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