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Influence of mechanical vibration on the solidification of a lost foam cast 356 alloy

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China Foundry 2010年第1期7卷 24-29页

作者： Zhao Zhong Fan Zitian Dong Xuanpu Tang Bo pan di Li Jiqiang State Key Laboratory. of Material Processing and die ＆ Mould Technology Huazhong University of Science and Technology Wuhan430074 China

Mechanical vibration was applied to the solidification of a lost foam cast(LFC) 356 aluminum *** of mechanical vibration,with different peak acceleration,on the size and morphology of α-Al phase,and also on the mechanical properties of the castings were *** indicated that α-Al dendrites gradually grow into equiaxed grains as the peak acceleration of vibration is *** the peak acceleration is between about 1 to 4 g,α-Al phase distribution is uniform and is refined obviously.α-Al dendrites are reduced and the mechanical properties of the castings are improved significantly when compared to those of the castings that are produced without ***,when the peak acceleration is higher than 4 g,strong vibration will lead to defects formation,such as sand adhesion,while the amount and size of pores will be *** due to the turbulent flow that caused by strong vibration,the chance of forming large pores in the matrix has been increased *** increase in defects will result in the deterioration of mechanical properties.

关键词： aluminum alloy microstructure mechanical property lost foam casting mechanical vibration

Toughening additive manufactured Zr-based bulk metallic glass composites by martensite phase transformation

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Journal of Materials Science & Technology 2024年第3期170卷 95-102页

作者： Pengcheng Zhang Cheng Zhang Jie pan di Ouyang Lin Liu State Key Laboratory of Materials Processing and die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Additive manufacturing technology based on laser powder bed fusion(LPBF)offers a novel approach for fabricating bulk metallic glass(BMG)products without restriction in size and ***,the BMGs prepared by LPBF usually suffered from less plasticity and poorer fracture toughness as compared to their cast counterparts due to partial crystallization in heat-affected zones(HAZs).Since crystallization in HAZs is hard to avoid completely in LPBF BMGs,it is desirable to design a suitable alloy system,in which only ductile crystalline phase,instead of brittle intermetallics,is formed in *** unique structure could effectively increase the toughness/plasticity of the LPBF *** achieve this goal,a quaternary BMG system with a composition of Zr_(47.5)Cu_(45.5)Al_(5)Co_(2)is adopted and subjected to *** is found that nearly a single phase of B_(2)-ZrCu is precipitated in HAZs,while a fully amorphous phase is formed in molten pools(MPs).This B_(2)phase reinforced BMG composite exhibits excellent mechanical properties with enhanced plasticity and ***,it is easy to modulate the mechanical properties by altering the amount of the B_(2)phase via adjusting the laser energy ***,the best combination of strength,plasticity,and notch toughness is obtained in the BMG composite containing 27.4%B_(2)phase and 72.6%amorphous phase,which exhibits yield strength(σ_(s))of 1423 MPa,plastic strain(ε_(p))of 4.65%,and notch toughness(K_(q))of 53.9 MPa m 1/***,a notable strain-hardening is also *** improvement of plasticity/toughness and appearance of strain-hardening behavior are mainly due to the martensite phase transformation from the B_(2)phase to the Cm phase during plastic deformation(i.e.,the phase transformation-induced plasticity effect).The current work provides a guide for making advanced BMGs and BMG composites by additive manufacturing.

关键词： Laser powder bed fusion Bulk metallic glass composites Phase transformation-induced plasticity Deformation mechanism

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高导压铸Al-La合金组织及性能研究

铸造 2024年第7期73卷 947-954页

作者：裘珂可周其良郭潘狄彭暄霖胡波李德江曾小勤浙江钜丰科技股份有限公司浙江嵊州312400 上海交通大学材料科学与工程学院上海200240

研究了La含量(4%、6%、8%、10%)对压铸Al-La合金的微观组织、力学性能以及导电导热性能的影响。La在铝基体中的固溶度极小,易富集于α-Al凝固界面前沿而造成成分过冷,降低α-Al周围液相的结晶温度,进而抑制α-Al的生长而实现细化。凝固... 详细信息

研究了La含量(4%、6%、8%、10%)对压铸Al-La合金的微观组织、力学性能以及导电导热性能的影响。La在铝基体中的固溶度极小,易富集于α-Al凝固界面前沿而造成成分过冷,降低α-Al周围液相的结晶温度,进而抑制α-Al的生长而实现细化。凝固过程中生成的Al11La3第二相不仅可以强化合金,还可作为α-Al的异质形核点以实现细化,这得益于其与α-Al基体5.96%的较小错配度。随着La含量从4%增加到10%,合金的屈服强度与抗拉强度分别从48.6MPa、113.9MPa提升到92.3MPa、186.7MPa,但伸长率从26.1%降低至9.6%。此外,Al-La合金的热导率、电导率随La含量的增加大致呈线性下降趋势,分别从207.8 W/(m·K)、32.0 MS/m下降至173.1 W/(m·K)、26.1 MS/m。

关键词： Al-La合金第二相力学性能电导率热导率

Unstructured Road Extraction in UAV Images based on Lightweight Model

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 372-384页

作者： di Zhang Qichao An Xiaoxue Feng Ronghua Liu Jun Han Feng pan School of Automation Beijing Institute of TechnologyBeijing 100081China Tianjin Institute of Maritime Navigation Instruments Tianjin 300130China The 716th Research Institute of China Shipbuilding Group Co. LtdJiangsu 222061China

There is no unified planning standard for unstructured roads,and the morphological structures of these roads are complex and *** is important to maintain a balance between accuracy and speed for unstructured road extraction *** road extraction algorithms based on deep learning have problems such as high model complexity,high computational cost,and the inability to adapt to current edge computing ***,it is best to use lightweight network *** the need for lightweight models and the characteristics of unstructured roads with different pattern shapes,such as blocks and strips,a TMB(Triple Multi-Block)feature extraction module is proposed,and the overall structure of the TMBNet network is *** TMB module was compared with SS-nbt,Non-bottleneck-1D,and other modules via *** feasibility and effectiveness of the TMB module design were proven through experiments and *** comparison experiment,using multiple convolution kernel categories,proved that the TMB module can improve the segmentation accuracy of the *** comparison with different semantic segmentation networks demonstrates that the TMBNet network has advantages in terms of unstructured road extraction.

关键词： Unstructured road Lightweight model Triple Multi-Block(TMB) Semantic segmentation net

Mass transfer enhancement and hydrodynamic performance with wire mesh coupling solid particles in bubble column reactor

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Chinese Journal of Chemical Engineering 2024年第3期67卷 195-205页

作者： Chuanjun di Jipeng Dong Fei Gao Guanghui Chen pan Zhang Jianlong Li Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266043China

It is of vital significance to investigate mass transfer enhancements for chemical engineering *** work focuses on investigating the coupling influence of embedding wire mesh and adding solid particles on bubble motion and gas-liquid mass transfer process in a bubble *** image velocimetry(PIV)technology was employed to analyze the flow field and bubble motion behavior,and dynamic oxygen absorption technology was used to measure the gas-liquid volumetric mass transfer coefficient(kLa).The effect of embedding wire mesh,adding solid particles,and wire mesh coupling solid particles on the flow characteristic and kLa were analyzed and *** results show that the gas-liquid interface area increases by 33%-72%when using the wire mesh coupling solid particles strategy compared to the gas-liquid two-phase flow,which is superior to the other two strengthening *** with the system without reinforcement,kLa in the bubble column increased by 0.5-1.8 times with wire mesh coupling solid particles method,which is higher than the sum of kLa increases with inserting wire mesh and adding particles,and the coupling reinforcement mechanism for affecting gas-liquid mass transfer process was discussed to provide a new idea for enhancing gas-liquid mass transfer.

关键词： Fluid mechanics Bubble Mass transfer Wire mesh coupling solid particles Particle image velocimetry Hydrodynamics

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类似卵巢性索肿瘤的子宫肿瘤的临床病理分析

诊断病理学杂志 2024年第6期31卷 527-531页

作者：郑晓娟马宏潘地铃陆婷许淑霞福建省妇幼保健院五四北院区福建省妇产医院病理科福州350011

目的探讨类似卵巢性索肿瘤的子宫肿瘤(UTROSCT)的临床、病理特征以及相关基因组学变化,以期更好地了解其性质,有助于精确的治疗和预测患者的预后。方法通过对10例患者做UTROSCT镜检及免疫组化分析,对患者进行随访,并查阅相关文献。结果... 详细信息

目的探讨类似卵巢性索肿瘤的子宫肿瘤(UTROSCT)的临床、病理特征以及相关基因组学变化,以期更好地了解其性质,有助于精确的治疗和预测患者的预后。方法通过对10例患者做UTROSCT镜检及免疫组化分析,对患者进行随访,并查阅相关文献。结果患者平均年龄48岁,范围为26~69岁。肿瘤直径0.5~8 cm,切面多为灰白、灰黄色。首发症状常为经期紊乱或异常阴道出血,肿瘤位于黏膜下或者肌间多见。10例患者均预后良好,无病生存,随访时间2~125个月。镜检:肿瘤可多种方式排列,如条索、巢状、小管样、网状或小梁状,间质常可见玻璃样变。细胞呈圆形或卵圆形,核仁较常见,偶见核分裂象。免疫表型:肿瘤多向分化,10例肿瘤性索分化的标记均有不同程度表达,大部分表达平滑肌、上皮标记,ER、PR和CD10也常为阳性。结论UTROSCT是一种多表型且少见的肿瘤,临床特征无特异性,预后一般较好,也可转移复发。目前主要依靠组织病理结合免疫组化,分子病理是明确诊断及判断患者预后的重要手段。治疗方式主要为手术切除。

关键词：类似卵巢性索肿瘤的子宫肿瘤临床病理学特征分子分型免疫组化诊断

Anti-corrosive and highly reversible zinc metal anode enabled by the phenolic resin coating

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Rare Metals 2024年第5期43卷 2115-2124页

作者： Ya-Ping Wang Ya-di Yang Shu-Qi Duan Li Wang Jia-Shuo Guo An-Qiang pan School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Key Laboratory of Special Functional Materials for Ecological Environment and Information(Hebei University of Technology).Ministry of Education Tianjin 300130China Key Laboratory for New Type of Functional Materials in Hebei Province Hebei University of TechnologyTianjin 300130China School of Materials Science and Engineering Central South UniversityChangsha 410083China

Aqueous zinc-ion batteries have attracted much attention due to their high theoretical capacity,low cost high safety,and ***,challenges such as dendrite growth and side reactions severely hinder the electrochemical performance of the Zn anode,leading to low Coulombic efficiency(CE)or even short circuits Herein,phenolic resin(PF)is used as a protective coating on the surface of the zinc metal *** PF layer can greatly improve the corrosion resistance of the Zn electrode in the ***,this artificial electrode/electrolyte interphase also elevates the nucleation barrier and restrains Zn^(2+)2D diffusion,regulating the zinc deposition/dissolution *** a result,PF@Zn symmetric cells exhibit superior performance than that of bare Zn symmetric cells,achieving a stable and dendrite-free cycle of 1400 ***,the carbon nanotube MnO_(2)||PF@Zn(CNT/MnO_(2)||PF@Zn)full cell also delivers a long cycle life with a high-capacity retention of about 180.0 m Ah·g^(-1)after 1400 cycles,far exceeding that of bare Zn *** work provides a facile strategy for achieving a dendrite-free and rechargeable zinc anode.

关键词： Rechargeable aqueous batteries Zn metal anode Phenolic resin Anti-corrosion

Analysis of quality-related proteins in golden pompano(Trachinotus ovatus)fillets with modified atmosphere packaging under superchilling storage

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Food Science and Human Wellness 2024年第4期13卷 2253-2265页

作者： Chuang pan Xiaofan Zhang Shengjun Chen Yong Xue Yanyan Wu Yueqi Wang di Wang South China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesKey Laboratory of Aquatic Product ProcessingMinistry of Agriculture and Rural AffairsNational R&D Centre for Aquatic Product ProcessingGuangzhou 510300China Co-Innovation Center of Jiangsu Marine Bio-industry Technology Jiangsu Ocean UniversityLianyungang 222005China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechnic UniversityDalian 116034China Key Laboratory of Efficient Utilization and Processing of Marine Fishery Resources of Hainan Province Sanya Tropical Fisheries Research InstituteSanya 572018China College of Food Science and Engineering Ocean University of ChinaQingdao 266003China

Here,we aimed to study the changes in proteome of golden pompano fillets during post-mortem *** mass tags(TMT)-labeled quantitative proteomic strategy was applied to investigate the relationships between protein changes and quality characteristics of modified atmosphere packaging(MAP)fillets during superchilling(-3°C)*** electron microscopy was used to show that the muscle histology microstructure of fillets was damaged to varying degrees,and low-field nuclear magnetic resonance was used to find that the immobilized water and free water in the muscle of fillets changed *** sulfhydryl content,TCA-soluble peptides and Ca2+-ATPase activity also showed that the fillet protein had a deterioration by oxidation and *** Fresh(FS),MAP,and air packaging(AP)groups were *** of 150 proteins were identified as differential abundant proteins(DAPs)in MAP/FS,while 209 DAPs were in AP/FS *** KEGG pathway analysis indicated that most DAPs were involved in binding proteins and protein *** analysis found that 52 DAPs were correlated with quality *** them,8 highly correlated DAPs are expected to be used as potential quality markers for protein oxidation and water-holding *** results provide a further understanding of the muscle deterioration mechanism of packaging golden pompano fillets during superchilling.

关键词： Tandem mass tags(TMT)proteomics Trachinotus ovatus Modified atmosphere packaging Superchilling storage Low-field nuclear magnetic resonance Protein deterioration

Method for secondary spring load equalization of railway vehicles with two-stage spring suspension: Modeling and optimal regulation

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Journal of Central South University 2018年第4期25卷 936-948页

作者： BAO Tian-zhe HAN Kun pan di-fu School of Traffic and Transportation Engineering Central South University School of Electronic and Electrical Engineering University of Leeds

To ensure running safety,the secondary spring loads of railway vehicles must be well *** to the coupling interactive effects of these hyper static suspended structures,the equalization adjustment through shimming procedure is quite ***,an effective and reliable method in application is developed in this ***,the best regulation of spring load is solved based on a mechanical model of the secondary suspension system,providing a target for actual *** reveal the relationship between secondary spring load distribution and shim quantity sequence,a forecasting model is constructed and then modified experimentally with consideration of car body’s elastic ***,a gradient-based algorithm with a momentum operation is proposed for the load *** of the whole method has been verified on a test *** is experimentally confirmed that this research provides an important basis for achieving an optimal regulation of spring load distribution for multiple types of railway vehicles.

关键词： railway vehicle secondary spring load equalization optimal regulation shimming procedure elastic deformation