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Multi-layer multi-pass friction rolling additive manufacturing of Al alloy:Toward complex large-scale high-performance components

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 425-438页

作者： Haibin liu Run Hou Chenghao Wu Ruishan Xie Shujun Chen College of Mechanical&Energy Engineering Beijing University of TechnologyBeijing 100124China Chongqing Research Institute of beijing University of Technology Chongqing 401121China

At present,the emerging solid-phase friction-based additive manufacturing technology,including friction rolling additive man-ufacturing(FRAM),can only manufacture simple single-pass *** this study,multi-layer multi-pass FRAM-deposited alumin-um alloy samples were successfully prepared using a non-shoulder tool *** material flow behavior and microstructure of the over-lapped zone between adjacent layers and passes during multi-layer multi-pass FRAM deposition were studied using the hybrid 6061 and 5052 aluminum *** results showed that a mechanical interlocking structure was formed between the adjacent layers and the adja-cent passes in the overlapped center *** friction and rolling of the tool head led to different degrees of lateral flow and plastic deformation of the materials in the overlapped zone,which made the recrystallization degree in the left and right edge zones of the over-lapped zone the highest,followed by the overlapped center zone and the non-overlapped *** tensile strength of the overlapped zone exceeded 90%of that of the single-pass deposition *** is proved that although there are uneven grooves on the surface of the over-lapping area during multi-layer and multi-pass deposition,they can be filled by the flow of materials during the deposition of the next lay-er,thus ensuring the dense microstructure and excellent mechanical properties of the overlapping *** multi-layer multi-pass FRAM deposition overcomes the limitation of deposition width and lays the foundation for the future deposition of large-scale high-performance components.

关键词： aluminum alloy additive manufacturing solid-state friction stir welding multi-layer multi-pass

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Physical origins of ruled surfaces on the reduced density matrices geometry

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Science China(Physics,Mechanics & Astronomy) 2017年第2期60卷 1-8页

作者： Ji-yao Chen Zhengfeng Ji Zheng-Xin liu Xiaofei Qi Nengkun Yu bei Zeng Duanlu Zhou State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Perimeter Institute for Theoretical Physics Waterloo N2L 2Y5 Canada Centre for Quantum Computation ＆ Intelligent Systems School of Software Faculty of Engineering and Information Technology University of Technology Sydney Sydney 2007 Australia State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100190 China Department of Physics Renmin University of China Beijing 100872 China Department of Mathematics Shanxi University Taiyuan 030000 China Institute for Quantum Computing University of Waterloo Waterloo N2L 3G1 Canada Department of Mathematics ＆ Statistics University of Guelph Guelph N1G 2W1 Canada Institute of Physics Chinese Academy of Sciences Beijing 100190 China

The reduced density matrices （RDMs） of many-body quantum states form a convex set. The boundary of low dimensional projections of this convex set may exhibit nontrivial geometry such as ruled surfaces. In this paper, we study the physical origins of these ruled surfaces for bosonic systems. The emergence of ruled surfaces was recently proposed as signatures of symmetry- breaking phase. We show that, apart from being signatures of symmetry-brealdng, ruled surfaces can also be the consequence of gapless quantum systems by demonstrating an explicit example in terms of a two-mode Ising model. Our analysis was largely simplified by the quantum de Finetti＇s theorem--in the limit of large system size, these RDMs are the convex set of all the symmetric separable states. To distinguish ruled surfaces originated from gapless systems from those caused by symmetry- breaking, we propose to use the finite size scaling method for the corresponding geometry. This method is then applied to the two-mode XY model, successfully identifying a ruled surface as the consequence of gapless systems.

关键词： ruled surfaces reduced density matrices bosonic system geometry

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Identification of Denatured Biological Tissues Based on Improved Variational Mode Decomposition and Autoregressive Model during HIFU Treatment

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1547-1563页

作者： bei liu Xian Zhang College of Mathematics and Physics Hunan University Arts and ScienceChangde415000China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-physicsCentral South UniversityChangsha410083China

During high-intensity focused ultrasound(HIFU)treatment,the accurate identification of denatured biological tissue is an important practical *** this paper,a novel method based on the improved variational mode decomposition(IVMD)and autoregressive(AR)model was proposed,which identified denatured biological tissue according to the characteristics of ultrasonic scattered echo signals during HIFU ***,the IVMD method was proposed to solve the problem that the VMD reconstruction signal still has noise due to the limited number of intrinsic mode functions(IMF).The ultrasonic scattered echo signals were reconstructed by the IVMD to achieve ***,the AR model was introduced to improve the recognition rate of denatured biological *** AR model order parameter was determined by the Akaike information criterion(AIC)and the characteristics of the AR coefficients were ***,the optimal characteristics of the AR coefficients were selected according to the results of receiver operating characteristic(ROC).The experiments showed that the signal-to-noise ratio(SNR)and root mean square error(RMSE)of the reconstructed signal obtained by IVMD was better than those obtained by variational mode decomposition(VMD).The IVMD-AR method was applied to the actual ultrasonic scattered echo signals during HIFU treatment,and the support vectormachine(SVM)was used to identify the denatured biological *** results show that compared with sample entropy,information entropy,and energy methods,the proposed IVMD-AR method can more effectively identify denatured biological *** recognition rate of denatured biological tissue was higher,up to 93.0%.

关键词： HIFU ultrasonic scattered echo signals IVMD AR model

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Interconnections between diabetic corneal neuropathy and diabetic retinopathy:diagnostic and therapeutic implications

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Neural Regeneration Research 2025年第8期20卷 2169-2180页

作者： Mingyi Yu Faith Teo En Ning Chang liu Yu-Chi liu Tissue Engineering and Stem Cell Group Singapore Eye Research InstituteSingapore Yong Loo Lin School of Medicine National University of SingaporeSingapore Department of Cornea and External Eye Disease Singapore National Eye CenterSingapore Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingapore

Diabetic corneal neuropathy and diabetic retinopathy are ocular complications occurring in the context of diabetes *** corneal neuropathy refers to the progressive damage of corneal *** retinopathy has traditionally been considered as damage to the retinal ***,growing evidence suggests that diabetic retinopathy is a complex neurovascular disorder resulting from dysfunction of the neurovascular unit,which includes both the retinal vascular structures and neural *** retinopathy is one of the leading causes of blindness and is frequently screened for as part of diabetic ocular ***,diabetic corneal neuropathy is commonly overlooked and underdiagnosed,leading to severe ocular surface *** studies have found that these two conditions tend to occur together,and they share similarities in their pathogenesis pathways,being triggered by a status of chronic *** review aims to discuss the interconnection between diabetic corneal neuropathy and diabetic retinopathy,whether diabetic corneal neuropathy precedes diabetic retinopathy,as well as the relation between the stage of diabetic retinopathy and the severity of corneal *** also endeavor to explore the relevance of a corneal screening in diabetic eyes and the possibility of using corneal nerve measurements to monitor the progression of diabetic retinopathy.

关键词： cornea corneal nerves diabetes diabetic corneal neuropathy diabetic retinopathy retina

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Tailoring interlayer spacing in MXene cathodes to boost the desalination performance of hybrid capacitive deionization systems

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Nano Research 2023年第5期16卷 6039-6047页

作者： bei Li Kang Sun Wenyu Xu Xiaojing liu Ao Wang Steven Boles Bin Xu Haibo Hu Dongrui yao Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation Institute of BotanyJiangsu Province and Chinese Academy of SciencesNanjing 210014China Institute of Chemical Industry of Forest Products Chinese Academy of ForestryNanjing 210042China School of Materials Science and Engineering Anhui UniversityHefei 230601China Department of Energy and Process Engineering Norwegian University of Science and TechnologyTrondheimNorway Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment of the People's Republic of ChinaNanjing 210042China

Capacitive deionization(CDI)is a promising technology to satisfy the global need for fresh water,since it can be both economical and *** two-dimensional transition metal carbides/nitrides(MXenes)exhibit great characteristics for use as CDI electrode materials,their tightly spaced layered structure renders intercalation *** this study,the interlayer distance of MXenes is precisely modulated by inserting different quantity of one-dimensional bacterial fibers(BC),forming freestanding MXene/BC composite *** the studied samples,MXene/BC-33%electrode with the interlayer spacing of 15.2Åcan achieve an optimized tradeoff among various desalination performance metrics and *** salt adsorption capacity(SAC),the average salt adsorption rate(ASAR),the energy normalized adsorbed salt(ENAS),and the thermodynamic energy efficiency(TEE)of the MXene/BC-33%electrode are improved by 24%,46%,13%,and 66%respectively compared with those of pure MXene *** the insertion of BC improves the ion diffusion pathways and facilitates the intercalation kinetics,the desalination performance decreases when the insertion amount of BC exceeds 40%.This is attributed to the overlarge resistance of the composite and the resulting increased energy *** study reveals the desalination performance tradeoffs of MXene-based electrodes with different interlayer distances and also sheds light on the fundamental ion storage mechanisms of intercalation materials in a CDI desalination system.

关键词： capacitive deionization MXene intercalation materials hybrid capacitive deionization cation intercalation

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Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

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Journal of Energy Chemistry 2025年第1期100卷 385-396页

作者： Mingming Zhang Hanyu Wu Qi Chen Jiaxin Yang Bonan liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of NH3/O2and the production of N2/H2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of NH3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for OH and O（1S）.However,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

关键词： Nanosecond pulsed discharge Ammonia Oxidative pyrolysis Fluid model Global model

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Micro-strain regulation strategy to stabilize perovskite lattice based on the categories and impact of strain on perovskite solar cells

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Journal of Energy Chemistry 2025年第1期100卷 578-604页

作者： Caixia Li Wenwu liu Shiji Da Lingbin Kong Fen Ran State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology

Photovoltaic metal halide perovskite solar cells(PSCs) convert light to electricity more efficiently than crystalline silicon cells, and the cost of materials used to make them is lower than that of silicon *** efficiency is not a core issue affecting the application of perovskite solar cells in special *** present, stability is the major technical encounters that hinders its further commercial development. Microstrain in PSCs is currently a significant factor responsible for the device's instability. Strain-induced ion migration is widely believed to accelerate perovskite degradation even when external stimuli are ***, it is imperative to study strain to enhance the stability of PSCs. This paper reviews recent developments to understand strain's origin and effect mechanisms on performance of PSCs, including ion migration,failure behavior, defect formation, and its effect on photoelectric properties, stability, and ***, several well-known strain management strategies are systematically introduced based on the strain effect mechanism and strain engineering on the film, providing more clues for further preparation with increased stability. The manipulation of external physical strain applied from films to entire devices has been extensively studied. Furthermore, recommendations for future research directions and chemical approaches have been provided. It is emphasized that strain engineering plays a crucial role in improving the efficiency and longevity of PSCs. Tensile strain causes rapid degradation, while moderate compressive strain and external strain control could improve properties and stability. Efforts should focus on controlling compressive strain to mitigate residual tensile strain and introducing it in a controlled manner. Future research endeavors may focus on exploring these pathways to improve the efficiency and lifespan of PSCs.

关键词： Halide perovskite solar cells Strain origins Strain effects Strain management

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唾液链球菌嗜热亚种与动物双歧杆菌乳亚种复合发酵对发酵乳品质的改善作用

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食品科学 2025年第2期46卷 89-98页

作者：刘志忠刘立伟刘志刚陈海丽崔红杨波张佳琪乌日更姚凯乌兰察布市草原酸奶菌种研发与产业化应用研究院内蒙古乌兰察布012000 察右后旗市场监督管理局内蒙古乌兰察布012406 内蒙古兰格格乳业有限公司内蒙古乌兰察布012000 内蒙古察右后旗第三中学内蒙古乌兰察布012406 内蒙古农业大学乳品生物技术与工程教育部重点实验室内蒙古呼和浩特010000

为评估唾液链球菌嗜热亚种CZ-03(Streptococcus salivarius *** CZ-03)与动物双歧杆菌乳亚种LGG-08(Bifidobacterium animalis *** LGG-08)复合发酵对发酵乳品质的影响,采用这两种菌株对牛乳进行复合发酵,分析其流变学特性、质构特性以... 详细信息

为评估唾液链球菌嗜热亚种CZ-03(Streptococcus salivarius *** CZ-03)与动物双歧杆菌乳亚种LGG-08(Bifidobacterium animalis *** LGG-08)复合发酵对发酵乳品质的影响,采用这两种菌株对牛乳进行复合发酵,分析其流变学特性、质构特性以及活菌数。利用多频扩散波谱法详细研究复合发酵乳的微观结构及其动态变化,评估其稠度、硬度、内聚性和黏度指数。结果显示,在贮藏初期(0~14 d),复合发酵乳的胞外多糖质量浓度从204.7 mg/L增加至233 mg/L,显著高于单菌株发酵乳。此外,复合发酵乳在整个贮藏期间的活菌数显著高于单菌组,显著提升了产品的贮藏稳定性和益生功能。复合菌株的使用显著改善了发酵乳的流变学和质构特性,尤其在黏度和持水性方面。与单一菌株发酵的样品相比,复合发酵乳能更有效地形成稳定的凝胶结构。这些发现为益生菌发酵乳的产品开发和健康功能提升提供了坚实的科学依据,并为发酵乳的生产及贮藏特性评估提供了创新视角和策略。

关键词：唾液链球菌嗜热亚种动物双歧杆菌乳亚种益生菌发酵乳品质改善

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Nuclear Symmetry Energy from a Relativistic Mean Field Theory

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Chinese Physics Letters 2013年第9期30卷 47-50页

作者： OUYANG Fei liu bei-bei CHEN Wei Department of Physics Jinan UniversityGuangzhou 510632

We discuss the density dependence and coupling-constant dependence of the nuclear symmetry energy in the relativistic mean field approximation of theσ−ω−ρ*** extremely stiff density dependence of symmetry energy is *** the same time,we find that the coupling constants gσand gωhave greater effect on the nuclear symmetry energy than the self-coupling constants c and *** particular,gωand gσdetermine the slope L and curvature Ksym of nuclear symmetry energy at saturation density,respectively.

关键词： symmetry coupling constants

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Asymmetrical introgression patterns between rusty-necklaced partridge (Alectoris magna) and chukar partridge (Alectoris chukar) in China

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Integrative Zoology 2016年第5期11卷 403-412页

作者： Yanke CHEN bei AN Naifa liu Experiment Center of Biomedical Research School of Medicine Xi’an Jiaotong UniversityXi’anChina School of Life Sciences Lanzhou UniversityLanzhouChina

The rusty-necklaced partridge(Alectoris magna)and the chukar partridge(Alectoris chukar)are the most common gamebirds in northern *** comparisons of mitochondrial DNA(mtDNA)have revealed an introgression phenomenon between 2 species of partridge in the liupan Mountain region of *** is maternally inherited,making it difficult to determine the origin of parental *** assessed the genetic variation and gene flow between these 2 species of partridges using 8 microsatellite loci as neutral diagnostic markers in 171 samples from the hybrid *** data revealed an extensive divergence of genetic structure between populations of rusty-necklaced partridges and chukar *** this study,we found that 19 samples had been previously morphologically identified as rusty-necklaced partridge were genetically identified as hybrids through Bayesian analysis using STRUCTURE *** hybrids exhibited a mosaic of alleles that were derived from both parental ***,chukar partridges did not present the genotype of the rusty-necklaced ***,our findings demonstrate that the hybridization between the 2 species was the result of asymmetrical introgression,with gene flow occurring only from the chukar partridge to the rusty-necklaced par*** addition,we also note the high linkage disequilibrium in populations of the rusty-necklaced *** results indicate that although unidirectional introgression did not reduce genetic diversity of the Alectoris partridges,it affected the balance of gene flow between *** data from microsatellite DNA prompted our concern about the genetic integrity of the rusty-necklaced partridge.

关键词： chukar partridge(Alectoris chukar) hybridization introgression microsatellite DNA rustynecklaced partridge(Alectoris magna)

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