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Review on laser directed energy deposited aluminum alloys

International Journal of Extreme Manufacturing 2024年第2期6卷 84-131页

作者： tian-shu liu Peng Chen Feng Qiu Hong-Yu Yang Nicholas Tan Yew Jin Youxiang Chew Di Wang Ruidi Li Qi-Chuan Jiang Chaolin Tan Singapore Institute of Manufacturing Technology(SIMTech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025People’s Republic of China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun 130025People’s Republic of China School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083People’s Republic of China

Lightweight aluminum(Al)alloys have been widely used in frontier fields like aerospace and automotive industries,which attracts great interest in additive manufacturing(AM)to process high-value Al *** a mainstream AM technique,laser-directed energy deposition(LDED)shows good scalability to meet the requirements for large-format component manufacturing and ***,LDED Al alloys are highly challenging due to their inherent poor printability(*** laser absorption,high oxidation sensitivity and cracking tendency).To further promote the development of LDED high-performance Al alloys,this review offers a deep understanding of the challenges and strategies to improve printability in LDED Al *** porosity,cracking,distortion,inclusions,element evaporation and resultant inferior mechanical properties(worse than laser powder bed fusion)are the key challenges in LDED Al *** parameter optimizations,in-situ alloy design,reinforcing particle addition and field assistance are the efficient approaches to improving the printability and performance of LDED Al *** underlying correlations between processes,alloy innovation,characteristic microstructures,and achievable performances in LDED Al alloys are *** benchmark mechanical properties and primary strengthening mechanism of LDED Al alloys are *** review aims to provide a critical and in-depth evaluation of current progress in LDED Al *** opportunities and perspectives in LDED high-performance Al alloys are also outlined.

关键词： additive manufacturing laser directed energy deposition(LDED) aluminum alloys printability aluminum matrix composite auxiliary fields mechanical properties

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The Chinese Society of Clinical Oncology (CSCO): Clinical guidelines for the diagnosis and treatment of gastric cancer, 2023

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Cancer Communications 2024年第1期44卷 127-172页

作者： Feng-Hua Wang Xiao-tian Zhang Lei Tang Qi Wu Mu-Yan Cai Yuan-Fang Li Xiu-Juan Qu Hong Qiu Yu-Jing Zhang Jie-Er Ying Jun Zhang Ling-Yu Sun Rong-Bo Lin Chang Wang Hao liu Miao-Zhen Qiu Wen-Long Guan Sheng-Xiang Rao Jia-Fu Ji Yan Xin Wei-Qi Sheng Hui-Mian Xu Zhi-Wei Zhou Ai-Ping Zhou Jing Jin Xiang-Lin Yuan Feng Bi tian-shu liu Han Liang Yan-Qiao Zhang Guo-Xin Li Jun Liang Bao-Rui liu Lin Shen Jin Li Rui-Hua Xu Department of Medical Oncology Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangzhouGuangdongP.R.China Department of Gastrointestinal Oncology Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education)Peking University Cancer HospitalBeijingP.R.China Department of Radiology Peking University Cancer HospitalBeijingP.R.China Department of Endoscopy Center Peking University Cancer HospitalBeijingP.R.China Department of Pathology Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center of Cancer MedicineGuangzhouGuangdongP.R.China Department of Gastric Surgery Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangzhouGuangdongP.R.China Department of Medical Oncology The First Hospital of China Medical UniversityShenyangLiaoningP.R.China Department of Medical Oncology Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and TechnologyWuhanHubeiP.R.China Department of Radiotherapy Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangzhouGuangdongP.R.China Department of Medical Oncology Zhejiang Cancer HospitalHangzhouZhejiangP.R.China Department of Medical Oncology Ruijin HospitalShanghai Jiaotong University School of MedicineShanghaiP.R.China Department of Surgical Oncology The Fourth Affiliated Hospital of Harbin Medical UniversityHarbinHeilongjiangP.R.China Department of Medical Oncology Fujian Cancer HospitalFuzhouFujianP.R.China Tumor Center The First Hospital of Jilin UniversityChangchunJilinP.R.China Department of General Surgery Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdongP.R.China Department of Radiology Zhongshan HospitalFudan UniversityShanghaiP.R.China Department of

The 2023 update of the Chinese Society of Clinical Oncology(CSCO)Clini-cal Guidelines for Gastric Cancer focuses on standardizing cancer diagnosis and treatment in China,reflecting the latest advancements in evidence-based medicine,healthcare resource availability,and precision *** updates address the differences in epidemiological characteristics,clinicopatho-logical features,tumor biology,treatment patterns,and drug selections between Eastern and Western gastric cancer *** revisions include a structured template for imaging diagnosis reports,updated standards for molecular marker testing in pathological diagnosis,and an elevated recommendation for neoadju-vant chemotherapy in stage III gastric *** advanced metastatic gastric cancer,the guidelines introduce new recommendations for immunotherapy,anti-angiogenic therapy and targeted drugs,along with updated management strategies for human epidermal growth factor receptor 2(HER2)-positive and deficient DNA mismatch repair(dMMR)/microsatellite instability-high(MSI-H)***,the guidelines offer detailed screening recommendations for hereditary gastric cancer and an appendix listing drug treatment regimens for various stages of gastric *** 2023 CSCO Clinical Guidelines for Gastric Cancer updates are based on both Chinese and international clinical research and expert consensus to enhance their applicability and relevance in clinical practice,particularly in the heterogeneous healthcare landscape of China,while maintaining a commitment to scientific rigor,impartiality,and timely revisions.

关键词： Chinese Society of Clinical Oncology(CSCO) gastric cancer diagnosis surgery neoadjuvant adjuvant radiotherapy chemotherapy targeted therapy immunotherapy

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Design of piezoelectric energy harvesting devices subjected to broadband random vibrations by applying topology optimization

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Acta Mechanica Sinica 2011年第5期27卷 730-737页

作者： Zhe-Qi Lin Hae Chang Gea shu-tian liu Department of Engineering Mechanics Dalian University of Technology116024 Dalian China Department of Mechanical and Aerospace Engineering Rutgers The State University of New JerseyPiscataway NJ 08854 USA

Converting ambient vibration energy into electrical energy by using piezoelectric energy harvester has attracted a lot of interest in the past few *** this paper,a topology optimization based method is applied to simultaneously determine the optimal layout of the piezoelectric energy harvesting devices and the optimal position of the mass *** objective function is to maximize the energy harvesting performance over a range of vibration *** excitation method （PEM） is adopted to analyze structural stationary random responses,and sensitivity analysis is then performed by using the adjoint *** examples are presented to demonstrate the validity of the proposed approach.

关键词： Topology optimization · Energy harvesting · Piezoelectric material ··

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Neoadjuvant chemotherapy for advanced gastric cancer:A meta-analysis

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World Journal of Gastroenterology 2010年第44期16卷 5621-5628页

作者： Wei Li tian-shu liu Jing Qin Yi-Hong Sun Department of Medical Oncology Shanghai Zhongshan Hospital Fudan University Shanghai 200032 China Department of General Surgery ShanghaiZhongshan HospitalFudan UniversityShanghai 200032China

AIM:To study the value of neoadjuvant chemotherapy (NAC) for advanced gastric cancer by performing a meta-analysis of the published ***:All published controlled trials of NAC for advanced gastric cancer vs no therapy before surgery were *** that included patients with metastases at enrollment were *** included Cochrane Library of Clinical Comparative Trials,MEDLINE,Embase,and American Society of Clinical Oncology meeting abstracts from 1978 to *** censor date was up to April *** outcome was the odds ratio (OR) for improving overall survival rate of patients with advanced gastric *** outcome was the OR for down-staging tumor and increasing R0 resection in patients with advanced gastric *** analyses were also *** calculations and statistical tests were performed using RevMan 5.0 *** cancer enrolled in 14 trials were divided into NAC group (n=1054) and control group (n=1217).The patients were followed up for a median time of 54 *** significantly improved the survival rate [OR=1.27,95% confidence interval (CI):1.04-1.55],tumor stage (OR=1.71,95% CI:1.26-2.33) and R0 resection rate (OR=1.51,95% CI:1.19-1.91) of patients with advanced gastric *** obvious safety concerns were raised in these ***:NAC can improve tumor stage and survival rate of patients with advanced gastric cancer with a rather good safety.

关键词： Gastric cancer Neoadjuvant chemotherapy Survival Meta-analysis

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Design optimization of the S-frame to improve crashworthiness

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Acta Mechanica Sinica 2014年第4期30卷 589-599页

作者： shu-tian liu Ze-Qi Tong Zhi-Liang Tang Zong-Hua Zhang State Key Laboratory of Structure Analysis for Industrial Equipment Dalian University of Technology

In this paper, the S-frames, the front side rail structures of automobile, were investigated for crashworthihess. Various cross-sections including regular polygon, nonconvex polygon and multi-cell with inner stiffener sections were investigated in terms of energy absorption of S-frames. It was determined through extensive numerical simulation that a multi-celI S-frame with double vertical internal stiffeners can absorb more energy than the other configurations. Shape optimization was also carried out to improve energy absorption of the S-frame with a rectangular section. The center composite design of experiment and the sequential response surface method （SRSM） were adopted to construct the approximate design sub-problem, which was then solved by the feasible direction method. An innovative double S- frame was obtained from the optimal result. The optimum configuration of the S-frame was crushed numerically and more plastic hinges as well as shear zones were observed during the crush process. The energy absorption efficiency of the structure with the optimal configuration was improved compared to the initial configuration.

关键词： Thin-walled structure S-frame Axial crush Response surface Crashworthiness

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Propagation factor of electromagnetic concentric rings Schell-model beams in non-Kolmogorov turbulence

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Chinese Physics B 2017年第2期26卷 206-212页

作者： Zhen-Zhen Song Zheng-Jun liu Ke-Ya Zhou Qiong-Ge Sun shu-tian liu Department of Physics Harbin Institute of Technology Harbin 150001 China Department of Automatic Test and Control Harbin Institute of Technology Harbin 150001 China Beijing Institute of Space Mechanics and Electricity Beijing 100094 China

We derive an analytical expression for the propagation factor（known as M2-factor） of electromagnetic concentric rings Schell-model（EM CRSM） beams in non-Kolmogorov turbulence by utilizing the extended Huygens–Fresnel diffraction integral formula and the second-order moments of the Wigner distribution function（WDF）. Our results show that the EM CRSM beam has advantage over the scalar CRSM beam for reducing the turbulence-induced degradation under suitable conditions. The EM CRSM beam with multi-rings far-fields in free space is less affected by the turbulence than the one with dark-hollow far-fields or the electromagnetic Gaussian Schell-model（EGSM） beam. The dependence of the M2-factor on the beam parameters and the turbulence are investigated in detail.

关键词： atmospheric propagation partial coherence atmospheric turbulence

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Application of nanoparticles in cast steel:An overview

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China Foundry 2020年第2期17卷 111-126页

作者： Feng Qiu tian-shu liu Xin Zhang Fang Chang Shi-li shu Hong-yu Yang Qing-long Zhao Qi-chuan Jiang Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun 130025China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130025China

The innovative and environmentally friendly methodologies for comprehensively enhancing the performances of high-strength steels without damage to plasticity,toughness and heat/corrosion/fatigue resistance are being *** recent years,nanoparticles elevate the field of high-strength *** is proposed that nanoparticles have the potential to replace conventional semi-coherent intermetallic compounds,carbides and alloying to optimize the *** fabrication process is simplified and the cost is lower compared with the traditional *** research effort has been directed towards high-performance cast steels reinforced with nanoparticles due to potential application in major *** are found to be capable of notably optimizing the nucleation behavior and precipitate *** prominently optimized microstructure configuration and performances of cast steel can be acquired *** this review,the lattice matching and valence electron criterion between diverse nanoparticles and steel are summarized,and the existing various preparation methods are compared and *** present,there are four main methods to introduce nanoparticles into steel:external nanoparticle method,internal nanoparticle method,in-situ reaction method,and additive manufacturing *** four methods have their own advantages and limitations,*** this review,the synthesis,selection principle and strengthening mechanism of nanoparticles in cast steels for the above four methods are discussed in ***,the main preparation methods and microstructure manipulation mechanism of the steel reinforced with different nanoparticles have been systematically ***,the development and future potential research directions of the application of nanoparticles in cast steel are prospected.

关键词： nanoparticles high-performance steel strengthening mechanism preparation method microstructure manipulation mechanism

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Inhibition of Defect-Induced Ice Nucleation, Propagation, and Adhesion by Bioinspired Self-Healing Anti-Icing Coatings

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Research 2024年第1期2023卷 237-246页

作者： shu tian Ruiqi Li Xinmeng liu Jiancheng Wang Junyu Yu Sijia Xu Yunqing tian Jing Yang Lei Zhang Department of Biochemical Engineering Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(MOE)School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Binzhou Institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhou CityShandong Province 256606China

Anti-icing coatings on outdoor infrastructures inevitably suffer from mechanical injuries in numerous icing scenarios such as hailstorms,sandstorms,impacts of foreign objects,and icing–deicing ***,the mechanisms of surface-defect-induced icing are *** the defects,water molecules exhibit stronger adsorption and the heat transfer rate increases,accelerating the condensation of water vapor as well as ice nucleation and ***,the ice–defect interlocking structure increases the ice adhesion ***,a self-healing(at−20℃)antifreeze-protein(AFP)-inspired anti-icing coating is *** coating is based on a design that mimics the ice-binding and non-ice-binding sites in *** enables the coating to markedly inhibit ice nucleation(nucleation temperature<−29.4℃),prevent ice propagation(propagation rate<0.00048 cm^(2)/s),and reduce ice adhesion on the surface(adhesion strength<38.9 kPa).More importantly,the coating can also autonomously self-heal at−20℃,as a result of multiple dynamic bonds in its structure,to inhibit defect-induced icing *** healed coating sustains high anti-icing and deicing performance even under various extreme *** work reveals the in-depth mechanism of defect-induced ice formation as well as adhesion,and proposes a self-healing anti-icing coating for outdoor infrastructures.

关键词： coating defect clarified

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Recent progress in side chain engineering of Y-series non-fullerene molecule and polymer acceptors

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Science China Chemistry 2024年第3期67卷 788-805页

作者： Li tian Chunchen liu Fei Huang School of Materials Science and Engineering Henan University of TechnologyZhengzhou 450001China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

Organic solar cells(OSCs) have drawn considerable attention in the last decade due to the great potential of light weight,flexibility, and low-cost solution processing. Particularly, Y-series non-fullerene acceptors(NFAs) including small molecular acceptors(SMAs) and polymerized small molecular acceptors(PSMAs) have become research hot spots due to their excellent power conversion efficiency. Side chain engineering is crucial to adjust the solubility and crystallinity of NFAs, which will significantly affect the morphology of active layers and the efficiency of OSCs. However, the understanding of side chain engineering on NFAs is still limited and lacks a systematic review. This review aims to provide a brief summary of the recent developments in side chain engineering of NFAs, with a special focus on the design and application of Y-series SMAs and PSMAs for high-efficiency non-fullerene organic solar cells(NF-OSCs). In addition, the review also points out challenges and provides useful guidance regarding side chain regulation for Y-series NFAs.

关键词： organic solar cell Y-series non-fullerene acceptors side chain engineering

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Martensitic transformation pathways and crystallographic orientation relationships in steel

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Journal of Materials Science & Technology 2024年第7期174卷 74-84页

作者： tian-Wei liu Xiao-Lei Wu State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Martensite is one of the most important structures determining the ability to tailor the performance of steel and several other engineering *** previous studies,the face-centered cubic(FCC)to hexag-onal close-packed(HCP)(or body-centered cubic(BCC))martensitic transformation and the FCC to body-centered tetragonal(BCT)(or BCC)martensitic transformation during deformation and quenching were widely investigated;these transformations usually improve the plasticity and strength of steel,*** this work,detailed transmission electron microscopy(TEM)observations and electron diffraction pattern analyses of the BCT and BCC twins are performed along the[110],[131],and[¯153]zone *** transformation of BCT twins into BCC twins along the[131]zone axis is also analyzed through in situ heating during the TEM *** high-resolution TEM observations of mutually perpendicular BCT variants are consistent with the atomic arrangement obtained for the quenching pathway during the martensitic *** addition,different orientation relationships between austenite and marten-site are explained in terms of the atomic migration occurring during the deformation pathway and the quenching pathway of the martensitic transformation.

关键词： Body-centered tetragonal twin Martensitic transformation Steel Transmission electron microscopy Orientation relationship

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