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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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Asymmetric catalytic anhydride openings via carbon-based nucleophiles

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Chinese Chemical Letters 2014年第1期25卷 1-8页

作者： chen Zheng Fen-er chen Department of Chemistry Fudan University

The asymmetric desymmetrization of cyclic anhydrides via the addition of carbon-based nucleophiles has been the focus of considerable levels of interest because it leads to optically active products. Over the past 20 years, a variety of different catalytic asymmetric alkylation reactions have been developed for the desymmetrization of cyclic anhydrides using different metal reagents as nucleophiles and using chiral ligands. The purpose of this review is to provide an overview of significant developments in this field. ~ 2013 Fen-er chen. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Cyclic anhydrides Carbon-based nucleophiles Chiral ligands Asymmetric catalysis Metal reagents

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Characteristics of American Scholars’Research on Chinese Medical Classics and Their Contributions

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Chinese Journal of Integrative Medicine 2020年第8期26卷 629-632页

作者： WANG er-liang chen Xiao School of Basic Medicine Shanghai University of Traditional Chinese MedicineShanghai 201203China

Chinese medical classics are important carriers for the inheritance,innovation and development of academic thoughts of Chinese medicine(CM),containing rich thoughts on diagnosis and treatment as well as therapeutic principles of *** international exchange of CM has a very long *** the development of society,Western scholars in modern times are deepening their researches on Chinese medical *** would provide a new way for promoting CM in Western countries to investigate researches made by famed American scholars and their academic viewpoints.

关键词： Chinese medicine classics international exchange American scholar

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Non-coding RNAs:the new central dogma of cancer biology

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Science China(Life Sciences) 2021年第1期64卷 22-50页

作者： Phei er Saw Xiaoding Xu Jianing chen er-Wei Song Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou510120China Breast Tumor Center Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou510120China

The central dogma of molecular biology states that the functions of RNA revolve around protein *** the last decade,most researches were geared towards characterization of RNAs as intermediaries in protein translation,namely,messenger RNAs(mRNAs)as temporary copies of genetic information,ribosomal RNAs(rRNAs)as a main component of ribosome,or translators of codon sequence(t RNAs).The statistical reality,however,is that these processes account for less than 2%of the genome,and insufficiently explain the functionality of 98%of transcribed *** discoveries have unveiled thousands of unique non-coding RNAs(ncRNAs)and shifted the perception of them from being"junk"transcriptional products to"yet to be elucidated"—and potentially monumentally important—*** ncRNAs are now known as key regulators in various networks in which they could lead to specific cellular responses and *** major cancers,ncRNAs have been identified as both oncogenic drivers and tumor suppressors,indicating a complex regulatory network among these ***,we provide a comprehensive review of the various ncRNAs and their functional roles in cancer,and the pre-clinical and clinical development of nc RNA-based therapeutics.A deeper understanding of ncRNAs could facilitate better design of personalized therapeutics.

关键词： non-coding RNAs anti-cancer therapeutics personalized intervention miRNA lncRNA circRNA

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Thermodynamic Properties of Carbon and Manganese in Mn-C and Mn-Fe-C Melts

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Journal of Iron and Steel Research International 2008年第5期15卷 13-18页

作者： chen er-bao WANG Shi-jun School of Metallurgy and Resources Anhui University of Technology Ma＇anshan 243002 Anhui China

Carbon solubility in Mn Fe melts （xMn =0. 083-0. 706, XFe =0. 034-0. 715） was measured experimentally at various temperatures. By thermodynamic derivation and calculation, the relationship between activity coefficient of carbon in infinite dilute solution of manganese in Mn-C system and temperature was obtained. Using Gibbs-Duhem relationship, the experimental results of this study, and experimental data obtained by strict thermodynamic derivation and calculation in references, the relationships between other thermodynamic properties （εCC, εCCC, εCFe, εCCFe, and εCFeFe） in Mn-Fe-C system and temperature were obtained.

关键词： Mn-Fe-C melt activity interaction parameter thermodynamic property carbon manganese

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Thermodynamic Properties of Mn-C Melts

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Journal of Iron and Steel Research International 2008年第2期15卷 1-6页

作者： chen er-bao WANG Shi-jun School of Metallurgy and Resources Anhui University of Technology Ma＇anshan 243002 Anhui China

Carbon solubility in Mn-Fe melts（xMn=0.161-0.706,xFe=0.034-0.633）was measured experimentally at various *** thermodynamic derivation and calculation,the relationship between activity coefficient of carbon in infinite dilute solution of manganese in Mn-C system and temperature was *** Gibbs-Duhem relationship,the experimental results of this study,and experimental data reported in references,the relationship between other thermodynamic properties in Mn-C system and temperature were obtained by thermodynamic derivation and calculation.

关键词： Mn-C melt activity interaction coefficient thermodynamic property carbon manganese

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Structure-Property Relationship Analysis of D-Penicillamine-Derivedβ-Polythioesters with Varied Alkyl Side Groups

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Chinese Journal of Polymer Science 2023年第10期41卷 1555-1562页

作者： Chun-Yan Lyu Wei Xiong er-Qiang chen Hua Lu Beijing National Laboratory for Molecular Sciences Center for Soft Matter Science and EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China

The ring-opening polymerization of heterocyclic monomers and the reversed ring-closing depolymerization of corresponding polymers with neutral thermodynamics are broadly explored to establish a circular economy of next-generation ***(PTEs),analogues of polyesters,are emerging materials for this purpose due to their high refractive index,high crystallinity,dynamic property and *** this work,we synthesize and polymerize a series of D-penicillamine-derivedβ-thiolactones(NRPenTL)with varied side chain alkyl groups,and study the structure-property relationship of the resulting *** obtained PTEs exhibit tunable glass transition temperature in a wide range of 130–50℃,and melting temperature of 90–105℃.In addition,copolymerizations of monomers with different side chains are effective in modulating material *** obtained homo and copolymers can be fully depolymerized to recycle *** work provides a robust molecular platform and detailed structure-property relationship of PTEs with potential of achieving sustainable plastics.

关键词： β-Polythioesters Geminal dimethyl Structure-property relationship Chemical recycling to monomers

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Relationship Between Activity Interaction Parameters in Fe-C System and Temperature

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Journal of Iron and Steel Research International 2009年第2期16卷 11-16页

作者： chen er-bao LIU Mao-liu WANG Shi-jun School of Metallurgy and Materials Anhui University of Technology Ma'anshan 243002 Anhui China First Factory of Steelmaking and Rolling Maranshan Iron and Steel Co Ltd Maranshan 243000 Anhui China

Carbon solubility in Fe-Mn melts （XFe =0. 102 3-0. 789 9, XMn =0. 055 1-0. 638 0） was measured experimentally at various temperatures. Using Gibbs-Duhem equation, in combination with the experimental results in this work, quoting experimental data reported in references, and by strict thermodynamic derivation and calculation, the relation equations between the activity interaction parameters in Fe-C system and temperature were obtained. The calculation equation of lnyFe. in Fe-C system was also obtained. The calculated results show that these relation equations can be used to calculate the activity coefficients of carbon and iron in Fe-C system and can satisfy the necessary condition to satisfy Gibbs-Duhem equation and the necessary condition to satisfy the stability condition of system at high carbon content. The calculation formula for lnTc in Fe-Mn-C system was also obtained.

关键词： Fe-C system activity interaction parameter activity coefficient carbon

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Phase composition and luminescent properties of strontium aluminate long persistence phosphor synthesized by combustion synthesis method with different Sr/Al ratios

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Rare Metals 2013年第4期32卷 414-419页

作者： Wen-Zhou Sun Yu-Hong chen Lan-er Wu Yong Jiang School of Materials Science and Engineering Beifang University of Nationalities

Strontium aluminate long persistence phos phors are synthesized by combustion method. By control- ling the raw material ratio （Sr/Al）, the effects of phase composition on subsequent spectroscopic properties of phosphors are studied. Results show that the phase com-position changes from strontium-rich phase to aluminum- rich phase with the decrease of Sr/AI： when the rate of Al/Sr changes from 3：1 to 1：1, the main crystal phase of samples is Sr3Al206, and it exhibits the characteristic fluorescence of Eu^3＋ in the lattice of Sr3Al206; when the rate of Al/Sr is between 1：2 and 2：7, phase composition is the mixture of SrAl204 and SrAl4OT, and it emits the characteristic fluorescence of Eu^2＋ in SrAl204 but not in SrAl4OT; when Al/Sr decreases to 1：4 or even 1：12, the main crystal phase of samples transform into SrAl12019, and the characteristic emission peak is about 470 nm, which corresponds to the characteristic emission of Eu2＋ in SrAl12019. At the end of the article, the influence laws of two different synthesis methods on phase composition of samples between high-temperature solid method and combustion method are compared. Compared with the high-temperature solid method, the rule of influence is similar, but the mole ratio of Al/Sr in products is always higher than the initial ratio of the raw material, and com-pounds like Sr4Al14025 are not obtained by combustion method.

关键词： Strontium aluminate long persistencephosphors Combustion synthesis Sr/Al ratio Phasecomposition Emission wavelength

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Monopole Charge Domain in High-Gain Gallium Arsenide Photoconductive Switches

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Chinese Physics Letters 2002年第8期19卷 1119-1121页

作者： Shi Wei chen er-Zhu Zhang Xian-Bin Li Qi Department of Applied Physics Xi'an University of Technology Xi'an 710048

Considering that semi-insulating gallium arsenide photoconductive switches can be triggered into the high gain mode and no reliable theories can account for the observed transient characteristics, we propose the monopole charge domain model to explain the peculiar switching phenomena occurring in the high gain mode and we discuss the requirements for the lock-on switching. During operation on this mode, the applied field across the switch and the lock-on field are all larger than the Gunn threshold field. Our developed monopole charge domain is based on the transferred-electron effect, but the domain is only composed of large numbers of electrons piled up due to the negative differential mobility. Using the model and taking the physical mechanism of the avalanche impact ionization and recombination radiation into consideration, we interpret the typical phenomena of the lock-on effect, such as the time delay between the beginning of optical illumination and turning-on of the switch, and the conduction mechanism of the sustaining phase. Under different conditions of bias field intensity and incident light energy, the time delay of the switching is calculated. The results show that the physical mechanisms of impact ionization and recombination radiation occurring in the monopole charge domain are responsible for the lock-on switching.

关键词： Time delay

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