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Infrared imaging of magnetic octupole domains in non-collinear antiferromagnets

National Science Review 2024年第06期 197-205页

作者： Peng Wang Wei Xia Jinhui Shen Yulong Chen Wenzhi Peng Jiachen Zhang Haolin Pan xuhao Yu Zheng Liu Yang Gao Qian Niu zhian xu Hongtao Yang Yanfeng Guo Dazhi Hou International Center for Quantum Design of Functional Materials(ICQD) School of Emerging TechnologyUniversity of Science and Technology of China College of Mathematics and Physics Qingdao University of Science and Technology School of Physical Science and Technology Shanghai Tech University Shanghai Tech Laboratory for Topological Physics Shanghai Tech University Department of Physics University of Science and Technology of China CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics University of Science and Technology of China Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences

Magnetic structure plays a pivotal role in the functionality of antiferromagnets（AFMs）, which not only can be employed to encode digital data but also yields novel phenomena. Despite its growing significance,visualizing the antiferromagnetic domain structure remains a challenge, particularly for non-collinear AFMs. Currently, the observation of magnetic domains in non-collinear antiferromagnetic materials is feasible only in Mn3Sn, underscoring the limitations of existing techniques that necessitate distinct methods for in-plane and out-of-plane magnetic domain imaging. In this study, we present a versatile method for imaging the antiferromagnetic domain structure in a series of non-collinear antiferromagnetic materials by utilizing the anomalous Ettingshausen effect（AEE）, which resolves both the magnetic octupole moments parallel and perpendicular to the sample surface. Temperature modulation due to AEE originating from different magnetic domains is measured by lock-in thermography, revealing distinct behaviors of octupole domains in different antiferromagnets. This work delivers an efficient technique for the visualization of magnetic domains in non-collinear AFMs, which enables comprehensive study of the magnetization process at the microscopic level and paves the way for potential advancements in applications.

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Modelling of Mould Filling and Solidification of Castings

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材料科学与工程学报 2000年第Z2期20卷 904-910页

作者： xu zhian WTCM Foundry Centre Technologiepark 9 9052 Zwijnaarde BELGIUM

An experimental casting for validation has been designed. The casting is composed of two 50×600×2.5 (width×length×thick) thin-wall pieces. One downsprue is located in the middle. A pouring cup with a stopper is used. This design allows to using two different types of moulds simultaneously. An Al-10%Si alloy has been poured at different temperatures. Two effects have been studied: one is the pouring temperature and the other is the moulding method (namely by machine or manually). The filling length is proportional to the pouring temperature. The influence of different moulding methods on mould filling is more complicated. The filling length in the manual-made mould is 1.5 times as long as the one in the machine-made mould due to the different thermal conductivities. Vents have little influence. A finite volume based computer code which can simulate fluid flow during mould filling coupled with heat transfer as well as solidification has been developed in WTCM Foundry Center.. The code can predict cold shut during mould filling and shrinkage defects during solidification. The simulated results are in good agreement with the *** the second part of the paper, an example is given which illustrates how to use computer simulation to aid designing the casting system. The final computational result is compared with the industrial casting. The process of designing castings by using simulation is completely different from the traditional way. The computer aided casting design offers the possibility to obtain a sound casting from the first time.

关键词： Mould filling Solidification Casting Simulation

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Virtual analysis of influence of a filter on mould filling

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China Foundry 2011年第4期8卷 432-437页

作者： zhian xu Rob Van Tol Ilse Evenepoel Sebastian De Boodt Peter Verschueren Sirris Technologiepark 935 BE-9052 Zwijnaarde Belgium Materialise Technologielaan 15 BE-3001 Leuven Belgium

Ceramic filters are used to avoid slag and impurities in foundry applications. When not properly applied, the presence of these filters may have a significant influence on mould filling. 3-D casting simulation has been applied to study the effects of the use of a ceramic filter on the metal flow in a gating system. Instead of using a pressure drop model to represent the behaviour of a fluid metal flow passing through a filter, a real exact filter geometry, which is created by a high resolution CT-scan and a non-destructive imaging technique, in the gating system is applied in the simulation. In this research, nodular cast iron is poured into a block casting. A depressurized gating system is used. After a choke, a filter with different orientations is placed in the system. Mould filling coupled with temperature is simulated. Geometries using different orientations of the filter, and without the filter have been researched. The simulated results show that the filter has no influence on the pouring time of the casting if the choke section is small enough compared to the effective section of the filter. Although the filter has no significant influence on the flow patterns in the block casting itself, the flow patterns in the filter zone are different. When the liquid metal passes a horizontal filter, it will be broken into many small streams and show a shower effect. After the part under the filter is full, the shower effect disappears. When the filter is located at the vertical position, due to the gravity, the shower effect is less. If no filter presents on the system, the liquid metal passes through the filter zone with a high speed and causes surface turbulence.

关键词： ceramic filters 3D casting simulation gating system CT-scan

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Heterosis Analysis in Endogenous Substances in Root Bleeding Sap of Sorghum

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Phyton-International Journal of Experimental Botany 2024年第8期93卷 1963-1980页

作者： Renjie Zhao Yueqiao Li Chen xu zhian Zhang Ziyang Zhou Yihan Zhou Zexin Qi College of Agriculture Jilin Agricultural UniversityChangchun130118China Jilin Academy of Agricultural Sciences Changchun130033China Jilin Engineering Vocational College Siping136001China

Despite hybrid dominance contributing to the genetic improvement of crops,little is known about heterosis and inheritance patterns of endogenous substances in sorghum(Sorghum bicolor(L.)Moench)root bleeding *** this study,six sterile and six restorer lines of sorghum and 36 hybrid sorghum combinations formulated as incomplete double-row crosses were selected as test materials,and heterosis,combining ability,heritability,and their interrelationships of root bleeding sap endogenous substances in different hybrid sorghum combinations and their parents were *** results showed that the root bleeding sap of the F1 generation of hybrid sorghum had a high heterosis in both soluble sugar content and amino acid content at the flowering stage,and the average high-parent heterosis was 129.34%and 74.57%,***-3-acetic acid(IAA),cytokinins(CTK),gibberellic acid(GA_(3)),abscisic acid(ABA),soluble sugar,amino acid,and root bleeding intensity were mainly affected by non-additive genetic effects of the *** protein was affected by additive genetic effects of the genes and had a high narrow heritability(75.50%),which could be selected at low generations in *** combining ability analyses showed that the sterile lines 521A and 170A,and the restorer lines Ji318R and 0–30 were promising parents with high general combining *** analysis showed that all endogenous substances of root bleeding sap were positively correlated with the sum of parental general combining ability(GCA)at highly significant levels,and IAA,CTK,GA_(3),ABA,soluble sugar,amino acid,and root bleeding intensity were positively correlated with male GCA at significant or highly significant ***,the GCA of the restorer lines root bleeding sap endogenous material or the sum of both parents’GCA can be used to predict the performance of wounding endogenous material in the F1 generation of hybrid ***,this study results can help elucidate hetero

关键词： Sorghum heterosis root bleeding sap combining ability heritability

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Computer Simulation of Mould Filling and Solidification of Castings

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Journal of Shanghai Jiaotong university(Science) 2000年第1期5卷 286-293页

作者： zhian xu WTCM Foundry Center, Research Center of the Belgian Metalworking Industry, 9052 Zwijnaarde, Belgium

A finite volume based 3-D computer code which can simulate fluid flow during mould filling coupled with heat transfer as well as solidification has been developed in WTCM Foundry Center. The code can predict cold shut during mould filling, shrinkage defects during solidification and aid designing the casting system. Several experiments of filling vertical plate castings have been carried out. A heat resistant glass window has been used to observe the liquid metal flow behavior. Although the plate casting has a very simple geometry, the associated flow behavior is quite complex. Mould filling experiments carried out identical conditions never produce exactly the same results. The simulated results of the mould filling sequence and the temperature distribution have been compared with experiments. A good agreement has been achieved. The code has been used in foundries. A real application example is given which illustrates how to use computer simulation to aid designing the casting system. Sound castings based on computer aid designing have been produced. The process of designing castings by using simulation is completely different from the traditional way. The computer aided casting design offers the possibility to obtain a sound casting from the first time.

关键词： Mould Filling Solidification Castings Simulation

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火焰原子吸收法测定11种中成药钾、钠、铬和镍的含量

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光谱学与光谱分析 1999年第3期19卷 406-407页

作者：董顺福朱志国刘洁张翼胥执安空军医学高等专科学校

采用火焰原子吸收法测定１１种中成药物中Ｋ、Ｎａ、Ｃｒ和Ｎｉ四种金属元素的含量。结果显示，药物中金属元素含量丰富，但含量具有一定差异。测定结果为探讨中药微量元素与治疗冠心病的关系提供了有用的数据。

关键词： FAAS 中成药钾钠铬镍测定

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原子吸收法测定牛黄降压丸中11种金属元素的含量

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光谱学与光谱分析 1999年第3期19卷 417-418页

作者：董顺福朱志国张翼胥执安程静华空军医学高等专科学校

本文采用原子吸收分光光度法测定了牛黄降压丸中钠、钙、镁、钾、铁、铬、锰、镍、镉、铜、锌１１种金属元素的含量。结果表明，牛黄降压丸中含有较丰富的金属元素。

关键词：牛黄降压丸金属元素原子吸收分光光度法

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高效焊接技术在纯钛方面的应用

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应用科技 2011年第8期38卷 60-63页

作者：许志安何刚渤海船舶职业学院材料工程系辽宁葫芦岛125000 725研究所第八研究室河南洛阳471000

通过产品的应用实例,叙述了工业纯钛合金的材料特点及焊接性,并针对纯钛合金采用手工钨极氩弧存在的问题,采用自动TIG、自动MIG、等离子焊接高效焊接技术方法进行焊接研究,并对焊接过程中出现的问题进行合理的分析.总结出纯钛合金采用... 详细信息

通过产品的应用实例,叙述了工业纯钛合金的材料特点及焊接性,并针对纯钛合金采用手工钨极氩弧存在的问题,采用自动TIG、自动MIG、等离子焊接高效焊接技术方法进行焊接研究,并对焊接过程中出现的问题进行合理的分析.总结出纯钛合金采用高效焊接技术进行焊接,不仅能保证常规性能,而且在焊接效率方面大大提高.

关键词：钛高效焊接

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铱催化芳基C-H键硼化反应合成硼酸酯聚三氟苯乙烯

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广东化工 2015年第4期42卷 8-9页

作者：徐志安黄焰根东华大学化学化工与生物工程学院上海201620

在以1,5-环辛二烯氯化铱(I)二聚体([Ir Cl(COD)]2)和4,4’-二叔丁基-2,2’-联吡啶(dtbpy)为催化剂,联硼酸频哪醇酯(B2Pin2)为硼源,向聚三氟苯乙烯的苯环中引入硼酸酯基团,从而合成含硼酸酯基团的聚三氟苯乙烯(PTFS)。通过简单调节B2Pin2... 详细信息

在以1,5-环辛二烯氯化铱(I)二聚体([Ir Cl(COD)]2)和4,4’-二叔丁基-2,2’-联吡啶(dtbpy)为催化剂,联硼酸频哪醇酯(B2Pin2)为硼源,向聚三氟苯乙烯的苯环中引入硼酸酯基团,从而合成含硼酸酯基团的聚三氟苯乙烯(PTFS)。通过简单调节B2Pin2与PTFS重复单元的比例,合成了含不同硼酸酯浓度的PTFS,并测试了相关性能。

关键词： 1,5-环辛二烯氯化铱二聚体联硼酸频哪醇酯聚三氟苯乙烯

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改进RRT的复杂障碍物环境路径规划算法研究

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电子设计工程 2024年第8期32卷 162-167,172页

作者：牛旭张志安南京理工大学机械工程学院江苏南京210094

为解决传统的RRT算法在复杂障碍物环境下时,存在采样随机性大,搜索效率低,规划路径曲折等问题,提出一种改进的RRT算法。将传统RRT算法的随机树扩展引入自适应步长目标偏置策略,加快向目标点的收敛速度;结合人工势场法的概念,在随机树中... 详细信息

为解决传统的RRT算法在复杂障碍物环境下时,存在采样随机性大,搜索效率低,规划路径曲折等问题,提出一种改进的RRT算法。将传统RRT算法的随机树扩展引入自适应步长目标偏置策略,加快向目标点的收敛速度;结合人工势场法的概念,在随机树中引入目标点的引力分量和障碍物周围的斥力分量,并限制障碍物附近的搜索区域;对改进RRT算法规划的路径引入局部定向剪枝概念,对路径关键点择优剪枝选取,快速逃离局部振荡阶段;加入三次B样条曲线对路径进行平滑处理,降低路径曲折程度,以保证路径的可行性。通过实验表明,改进的RRT算法在保证对同一路径搜索的同时,显著地减少了68.5%的搜索时间,并且减少了20%的节点迭代次数,更适用于复杂障碍物环境下的路径规划。

关键词：路径规划 RRT 自适应步长偏置人工势场定向剪枝样条B曲线

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