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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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Ultra-precision Machining of Micro-step Pillar Array Using a Straight-Edge Milling Tool

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Nanomanufacturing and Metrology 2020年第4期3卷 260-268页

作者： Kui Liu Hu Wu Rui Huang nicholas Yew Jin tan Singapore Institute of Manufacturing Technology 73 Nanyang DriveSingapore 637662Singapore National University of Singapore 21 Lower Kent Ridge RoadSingapore 119077Singapore

Ultra-precision machining has been well known as a very precise and effective way to prototype and fabricate different types of components with *** this paper,an ultra-precision micro-milling method has been presented to produce a micro-step pillar array as an embossing mold for semiconductor *** analysis on machining mechanics indicates that work material property,machining strategy,and cutting tool geometry largely afFect machining distortion on the machined *** investigation has been conducted on micromachining of the micro-step pillar array using different types of cutting tools and work *** results demonstrate that the material property,cutting tool edge radius,and cutting force play a significant role in the machined micro-structure accuracy and surface finish,while grain boundary of brass has no significant effect on the micro-milling *** best outcome among the tests done is achieved when using brass as work material and cutting with a straight-edge single crystalline diamond *** main reasons to achieve this outcome are based on:the brass material having a higher elastic modulus and the diamond tool having a smaller cutting edge radius,which contributes to better machinability of *** micro-step pillar array has been successfully obtained with very precise feature and dimensional accuracy using brass work material and single-crystal diamond *** is believed that the outcomes of this study would largely benefit the research community and end-users.

关键词： Single-crystalline diamond Ultra-precision Milling Micro-step pillar Brass

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Geospatial Analytics for COVID-19 Active Case Detection

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Computers, Materials & Continua 2021年第4期67卷 835-848页

作者： Choo-Yee Ting Helmi Zakariah Fadzilah Kamaludin Darryl Lin-Wei Cheng nicholas Yu-Zhe tan Hui-Jia Yee Multimedia University Cyberjaya63100Malaysia AIME Healthcare Sdn Bhd Kuala Lumpur59200Malaysia

Ever since the COVID-19 pandemic started in Wuhan,China,much research work has been focusing on the clinical aspect of *** have been leveraging on various Artificial Intelligence techniques as an alternative to medical approach in understanding the *** studies have,however,reported on COVID-19 transmission pattern analysis,and using geography features for prediction of potential outbreak *** the next most probable outbreak site is crucial,particularly for optimizing the planning of medical personnel and supply *** tackle the challenge,this work proposed distance-based similarity measures to predict the next most probable outbreak site together with its magnitude,when would the outbreak likely to happen and the duration of the *** work began with preprocessing of 1365 patient records from six districts in the most populated state named Selangor in *** dataset was then aggregated with population density information and human elicited geography features that might promote the transmission of *** findings indicated that the proposed unified decision-making approach outperformed individual distance metric in predicting the total cases,next outbreak location,and the time interval between start dates of two similar *** findings provided valuable insights for policymakers to perform Active Case Detection.

关键词： COVID-19 geospatial analytics active case detection

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Role of regenerating islet-derived proteins in inflammatory bowel disease

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World Journal of Gastroenterology 2020年第21期26卷 2702-2714页

作者： Jodi-Ann Edwards nicholas tan Nadlie Toussaint Peiqi Ou Cathy Mueller Albert Stanek Vladimir Zinsou Sean Roudnitsky Michelle Sagal Lisa Dresner Alexander Schwartzman Chongmin Huan Department of Surgery State University of New YorkDownstate Health Sciences UniversityBrooklynNY 11203United States College of Medicine State University of New YorkDownstate Health Sciences UniversityBrooklynNY 11203United States MCB program School of Graduate StudiesState University of New YorkDownstate Health Sciences UniversityBrooklynNY 11203United States Department of Surgery and Cell Biology State University of New YorkDownstate Health Sciences UniversityBrooklynNY 11203United States

Inflammatory bowel disease(IBD)is an inflammatory disorder of the gastrointestinal tract that affects millions of patients *** has a complex and multifactorial etiology leading to excessive exposure of intestinal epithelium to microbial antigens,inappropriate activation of the immune system and ultimately to the damage of intestinal *** numerous efforts have been made to improve the disease management,IBD remains persistently recurring and beyond *** is due largely to the gaps in our understanding of the pathogenesis of IBD that hamper the development of timely diagnoses and effective ***,some recent discoveries,including the beneficial effects of interleukin-22(IL-22)on the inflamed intestine,have shed light on a self-protective mechanism in *** islet-derived(REG/Reg)proteins are small secretory proteins which function as IL-22’s downstream *** studies have demonstrated that IBD patients have significantly increased REG expressions in the injured intestine,but with undefined mechanisms and *** reported functions of REG/Reg proteins in intestinal homeostasis,such as those of antibacterial,anti-inflammatory and tissue repair,lead us to discuss their potential mechanisms and clinical relevance in IBD in order to advance IBD research and management.

关键词： Regenerating islet-derived proteins Inflammatory bowel disease Crohn’s disease Ulcerative colitis Interleukin-22 Intestinal bacteria

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Analytical model for predicting folding stable state of bistable deployable composite boom

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Chinese Journal of Aeronautics 2024年第8期37卷 460-469页

作者： Tianwei LIU Jiangbo BAI nicholas FANTUZZI School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Jingdezhen Research Institute of Beihang University Jingdezhen 333000China DICAM Department University of BolognaBologna 40136Italy

Bistable Deployable Composite Boom(Bi-DCB)can achieve bistable function by storing and releasing strain energy,which has a good application prospect in space *** example,it serves as the main support section of deployable structures(e.g.,solar arrays and antennas).This paper investigates folding stable state of Bi-DCB through the analytical *** on Archimedes’helix and energy principle,an analytical model for predicting folding stable state of Bi-DCB was *** failure index of Bi-DCB in folding stable state were analyzed using the Tsai-Hill criterion and the maximum stress ***,a 2400 mm long Bi-DCB was fabricated using autoclave *** prediction results of the proposed model were compared with experiments and results of two other analytical *** is shown that the proposed model shows good prediction ***,the effect of geometric parameters on folding stable state of Bi-DCB was further investigated with the aid of the proposed model.

关键词： Bistable Deployable composite boom Solar arrays Antennas Archimedes’helix Folding Failure analysis

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以太网技术方案实现更智能、更经济的汽车通信

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中国公共安全 2017年第5期 157-159页

作者： nicholas llyadis Alex tan Marvell Marvell汽车解决方案部门

当您坐在汽车里时,对车内设备最关注的可能就是信息娱乐系统。从车辆诊断显示到辅助驻车,直至支持多媒体流以及电话、导航等其他控制功能,信息娱乐系统已经成为车内互联体验的"触点"。为了使驾驶者能够充分利用这些先进的功能,车内数据... 详细信息

当您坐在汽车里时,对车内设备最关注的可能就是信息娱乐系统。从车辆诊断显示到辅助驻车,直至支持多媒体流以及电话、导航等其他控制功能,信息娱乐系统已经成为车内互联体验的"触点"。为了使驾驶者能够充分利用这些先进的功能,车内数据网络应提供高带宽和无缝连接能力,确保各种技术之间可

关键词：以太网技术数据中心服务器汽车数据流经济

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面向新兴市场的电动助力转向系统

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电子设计技术 EDN CHINA 2007年第8期14卷 177-178页

作者： Jean-Philippe Boeschlin nicholas tan 英飞凌科技亚太公司

去的几年中，EPS作为传统液压系统的替代产品已经进入汽车制造领域。与先前的预测相反，EPS不仅适用于小型汽车，而且某些12V中型汽车（例如大众帕萨特）也适于安装电动系统。

关键词：电动助力转向系统市场小型汽车制造领域替代产品液压系统电动系统中型汽车

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SRMD:Sparse Random Mode Decomposition

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Communications on Applied Mathematics and Computation 2024年第2期6卷 879-906页

作者： nicholas Richardson Hayden Schaeffer Giang Tran University of Waterloo WaterlooONCanada University of British Columbia VancouverBCCanada University of California Los AngelesCAUSA

Signal decomposition and multiscale signal analysis provide many useful tools for timefrequency *** proposed a random feature method for analyzing time-series data by constructing a sparse approximation to the *** randomization is both in the time window locations and the frequency sampling,which lowers the overall sampling and computational *** sparsification of the spectrogram leads to a sharp separation between time-frequency clusters which makes it easier to identify intrinsic modes,and thus leads to a new data-driven mode *** applications include signal representation,outlier removal,and mode *** benchmark tests,we show that our approach outperforms other state-of-the-art decomposition methods.

关键词： Sparse random features Signal decomposition Short-time Fourier transform

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Cell-type resolved transcriptomic approaches for dissecting selective vulnerability in neurodgeneration

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Neural Regeneration Research 2024年第7期19卷 1411-1413页

作者： Caleb A.Wood nicholas M.Tran Department of Neuroscience Baylor College of MedicineHoustonTXUSA Department of Molecular and Human Genetics Baylor College of MedicineHoustonTXUSA

A common feature among neurodegenerative conditions is that ce rtain neuronal populations are selectively vulnerable to loss(Fu et al.,2018).By corollary,other neurons are selectively resilient,suggesting they may possess unique features that support their survival.U nderstanding the basis of neuronal resilience or vulnerability would provide a logical strategy to identify factors that could be targeted therapeutically.

关键词： selective targeted

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Invasive weed disrupts facilitation of nutrient uptake in grass-clover assemblage

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Soil Ecology Letters 2024年第1期6卷 89-96页

作者： Wei Zhang Rick Muir nicholas Dickinson Faculty of Agriculture and Life Sciences Lincoln UniversityLincoln 7647New Zealand

Nutrient constraints in low-fertility soil were modified by different species ***-clover assemblages benefited both species in terms of nutrient *** of competition and facilitation is *** invasive weed removed essential nutrients from the grazing *** investigate the interplay of competition and facilitation between plants in low-fertility pasture grasslands of New Zealand,we compared nutrient uptake and acquisition of key nutrients of three species from different func-tional *** of Pilosella officinarum(mouse-eared hawk-weed,an invasive weed),Trifolium repens(white clover,a nitrogen fixer)and Dactylis glomerata(cocksfoot,a pasture grass)were planted into a soil with low-to-deficient concentrations of key *** yields were achieved by the grass growing alone but,when the clover and grass had grown together,there were complementary benefits in terms of procurement of a wide range of nutrients from soil despite lower root *** inva-sive weed negated these benefits,and soil nutrients were exploited less efficiently when Pilosella had grown alone or in a mixture with the other *** from the weed removed the benefits of grass-legume *** findings are interpreted to suggest that requirements for legumes to be the main source of nitrogen in pasture grasslands may be compromised unless competitive weeds are controlled to avoid disrupted procurement of key *** is likely these constraints to nutrient procurement would similarly impact conservation grasslands.

关键词： soil ferility facilitation species coexistence weed invasion legumes

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