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Relationship between the unique microstructures and behaviors of high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1350-1363页

作者： Yaqi Wu Peter k.iaw Ruixuan Li Weiran Zhang Guihong Geng Xuehui Yan Guiqun Liu Yong Zhang State k.y Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Xi’an Rare Metal Materials Institute Co.Ltd. Xi’an 710016China School of Materials Science and Engineering North Minzu UniversityYinchuan 750030China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China

High-entropy alloys(HEAs),which were introduced as a pioneering concept in 2004,have captured the k.en interest of nu-merous ***,in this context,can be perceived as representing disorder and *** contrast,elemental composi-tions within alloy systems occupy specific structural sites in space,a concept referred to as *** accordance with Shannon entropy,structure is analogous to ***,the arrangement of atoms within a material,termed its structure,plays a pivotal role in dictating its *** addition to expanding the array of options for alloy composites,HEAs afford ample opportunities for diverse structural *** profound influence of distinct structural features on the exceptional behaviors of alloys is underscored by numer-ous *** features include remark.bly high fracture strength with excellent ductility,antiballistic capability,exceptional radi-ation resistance,and corrosion *** this paper,we delve into various unique material structures and properties while elucidating the intricate relationship between structure and performance.

关键词： high-entropy alloys unique microstructure special properties alloy design

Hypoxic and temporal variation in the endocrine disrupting toxicity of perfluorobutanesulfonate in marine medak.(Oryzias melastigma)

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Journal of Environmental Sciences 2024年第2期136卷 279-291页

作者： Baili Sun Jing Li Yachen Bai Xiangzhen Zhou Paul k.S.Lam Lianguo Chen State k.y Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China Office of the President Hong Kong Metropolitan University30 Good Shepherd StreetKowloonHong Kong SARChina

Perfluorobutanesulfonate(PFBS)is an emerging pollutant capable of potently disrupting the sex and thyroid endocrine systems of ***,the hypoxic and temporal variation in PFBS endocrine disrupting toxicity remain largely *** the present study,adult marine medak. were exposed to environmentally realistic concentrations of PFBS(0 and 10μg/L)under normoxia or hypoxia conditions for 7 days,aiming to explore the interactive behavior between PFBS and *** addition,PFBS singular exposure was extended till 21days under normoxia to elucidate the time-course progression in PFBS *** results showed that hypoxia inhibited the growth and caused the suspension of egg spawn regardless of PFBS *** regard to the sex endocrine system,7-day PFBS exposure led to an acute stimulation of transcriptional profiles in females,which,subsequently,recovered after the 21-day *** potency of hypoxia to disturb the sex hormones was much stronger than PFBS.A remark.ble increase in estradiol concentration was noted in medak. blood after hypoxia *** in sex endocrinology of coexposed fish were largely determined by hypoxia,which drove the formation of an estrogenic *** further enhanced the endocrine disrupting effects of ***,the hepatic synthesis of vitellogenin and choriogenin,two commonly used sensitive biomark.rs of estrogenic activity,failed to initiate in response to the estrogen *** to sex endocrine system,disturbances in thyroidal axis by PFBS or hypoxia were relatively ***,the present findings will advance our toxicological understanding about PFBS pollutant under the interference of hypoxia.

关键词： Perfluorobutanesulfonate(PFBS) Aquatic hypoxia Temporal toxicity Combined exposure Endocrine disruption Marine medak.

Single-pilot operations in commercial flight:Effects on neural activity and visual behaviour under abnormalities and emergencies

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Chinese Journal of Aeronautics 2024年第8期37卷 277-292页

作者： Qinbiao LI Chun-Hsien CHEN k.m k.H.NG Xin YUAN Cho Yin YIU Human Factors and Ergonomics Laboratory Department of Aeronautical and Aviation EngineeringThe Hong Kong Polytechnic UniversityHong Kong Special Administrative Region 100872China School of Mechanical&Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

With cutting-edge technologies and considering airline human-resource-saving,a single pilot in commercial jets could be technically *** changes in captains’natural behaviours are initially required to comprehend the specific safe human performance envelope for safeguarding single-pilot flight,particularly in high-risk.*** paper investigates how captains’performance transforms for fixing emergencies when operating from Dual-Pilot Operations(DPO)to Single-Pilot Operations(SPO)through a physiological-based *** pilots flew an emergency-included flight with/without first officers’*** neural activities and scanning behaviours were recorded using a 32-channel Electroencephalogram(EEG)and glasses-based eye track.r,with the observation and post-experiment questionnaires to evaluate the flight operations and pilots’*** alone,there was a significantly increased cortical activity in h and b waves over the frontal,parietal,and temporal lobes during the more complicated emergencies,and pilots focused less on the primary flight display while spending significantly more time scanning the other *** physiological fluctuating patterns associated with risk. operations in SPO were highlighted by cross-correlating multimodal *** experimental-based noteworthy insights may wish to inform commercial SPO measures to lessen the persistent physiological fluctuation,assisting airlines in creating SPO-oriented intelligent flight systems to give captains adequate support for assuring safer air transportation.

关键词： Aviation engineering Single pilot operations Behaviour changes Eye track.r Electroencephalogram

Uncovering Microstructure-Property Relationship in Ni-Alloyed Fe-Mn-Al-C Low-Density Steel Treated by Hot-Rolling and Air-Cooling Process

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 713-725页

作者： Xiaoliang Jia Guhui Gao Xiaolu Gui Chun Feng R.D.k.Misra Bingzhe Bai School of Mechanical Electronicand Control EngineeringBeijing Jiaotong UniversityBeijing100044China CNPC Tubular Goods Research Institute Xi’an710077China Laboratory for Excellence in Advanced Steel Research University of Texas at El PasoEl PasoTX79968-0521USA School of Material Science and Engineering Key Laboratory of Advanced Materials of Ministry of EducationTsinghua UniversityBeijing100084China

This paper focuses on the relationship between the microstructure and tensile properties of Fe-Mn-Al-C low-density high-strength steel processes by hot-rolling and air-cooling process. The microstructure analysis reveals that the combination of hot-rolling and air-cooling results in the formation of heterogeneous structures comprising different-sized γ and B_(2) phases in the low-density steel with the addition of nick.l (Ni). The addition of Ni promotes the formation of the B_(2) phase and induces the pinning of B_(2) phase particles at the γ grain boundaries. This pinning effect effectively hinders the growth of the γ grains, leading to grain refinement. The tensile test results demonstrate that LDS-5Ni (low-density steel, LDS) exhibits excellent high strength and ductility combination, e.g., a tensile strength of 1535 MPa, yield strength of 1482 MPa, and elongation of 23.3%. These remark.ble mechanical properties are primarily attributed to the combined strengthening contributions of grain refinement and duplex nano-sized second-phase precipitation hardening.

关键词： Low-density steel Microstructure B_(2)phase κ-Carbide Tensile properties

Nanozyme‑Engineered Hydrogels for Anti‑Inflammation and Sk.n Regeneration

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Nano-Micro Letters 2024年第6期16卷 127-179页

作者： Amal George k.rian Rajendra k.Singh Varsha Sagar Jung‑Hwan Lee Hae‑Won k.m Institute of Tissue Regeneration Engineering(ITREN) Dankook UniversityCheonan 31116Republic of Korea Department of Nanobiomedical Science&Bk.1 NBM Global Research Center for Regenerative Medicine Dankook UniversityCheonan 31116Republic of Korea Department of Biomaterials Science School of DentistryDankook UniversityCheonan 31116Republic of Korea UCL Eastman‑k.rea Dental Medicine Innovation Centre Dankook UniversityCheonan 31116Republic of Korea Cell and Matter Institute Dankook UniversityCheonan 31116Republic of Korea Mechanobiology Dental Medicine Research Center Dankook UniversityCheonan 31116Republic of Korea

Inflammatory sk.n disorders can cause chronic scarring and functional impairments,posing a significant burden on patients and the healthcare *** therapies,such as corticosteroids and nonsteroidal anti-inflammatory drugs,are limited in efficacy and associated with adverse ***,nanozyme(NZ)-based hydrogels have shown great promise in addressing these ***-based hydrogels possess unique therapeutic abilities by combining the therapeutic benefits of redox nanomaterials with enzymatic activity and the water-retaining capacity of *** multifaceted therapeutic effects of these hydrogels include scavenging reactive oxygen species and other inflammatory mediators modulating immune responses toward a pro-regenerative environment and enhancing regenerative potential by triggering cell migration and *** review highlights the current state of the art in NZ-engineered hydrogels(NZ@hydrogels)for anti-inflammatory and sk.n regeneration *** also discusses the underlying chemo-mechano-biological mechanisms behind their ***,the challenges and future directions in this ground,particularly their clinical translation,are *** insights provided in this review can aid in the design and engineering of novel NZ-based hydrogels,offering new possibilities for targeted and personalized sk.n-care therapies.

关键词： Nanozymes Hydrogels ROS scavenging Anti-inflammation Sk.n regeneration

Supposition of graphene stack. to estimate the contact resistance and conductivity of nanocomposites

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 663-676页

作者： Y.ZARE M.T.MUNIR G.J.WENG k.Y.RHEE Biomaterials and Tissue Engineering Research Group Department of Interdisciplinary TechnologiesBreast Cancer Research CenterMotamed Cancer InstituteTehran ***Iran College of Engineering and Technology American University of the Middle EastEgaila 54200Kuwait Department of Mechanical and Aerospace Engineering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Department of Mechanical Engineering(Bk.1 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

In this study,the effects of stack.d nanosheets and the surrounding interphase zone on the resistance of the contact region between nanosheets and the tunneling conductivity of samples are evaluated with developed equations superior to those previously *** contact resistance and nanocomposite conductivity are modeled by several influencing factors,including stack.properties,interphase depth,tunneling size,and contact *** developed model's accuracy is verified through numerous experimental *** further validate the models and establish correlations between parameters,the effects of all the variables on contact resistance and nanocomposite conductivity are ***,the contact resistance is primarily dependent on the polymer tunnel resistivity,contact area,and tunneling *** dimensions of the graphene nanosheets significantly influence the conductivity,which ranges from 0 S/m to90 S/*** increased number of nanosheets in stack. and a larger gap between them enhance the nanocomposite's ***,the thick.r interphase and smaller tunneling size can lead to higher sample conductivity due to their optimistic effects on the percolation threshold and network.efficacy.

关键词： graphene polymer composite stack.d nanosheet tunneling conductivity contact resistance interphase

Bayesian inference-based wear prediction method for plain bearings under stationary mixed-friction conditions

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Friction 2024年第6期12卷 1272-1282页

作者： Florian k.NIG Florian WIRSING Georg JACOBS Rui HE Zhigang TIAN Ming J.ZUO Institute for Machine Elements and Systems Engineering RWTH Aachen UniversityAachen 52062Germany Department of Mechanical Engineering University of AlbertaEdmonton T6G1H9Canada Qingdao International Academician Park.Research Institute Qingdao 266000China

This study introduces a method to predict the remaining useful life(RUL)of plain bearings operating under stationary,wear-critical *** this method,the transient wear data of a coupled elastohydrodynamic lubrication(mixed-EHL)and wear simulation approach is used to parametrize a statistical,linear degradation *** method incorporates Bayesian inference to update the linear degradation model throughout the runtime and thereby consider the transient,system-dependent wear progression within the RUL prediction.A case study is used to show the suitability of the proposed *** results show that the method can be applied to three distinct types of post-wearing-in behavior:wearing-in with subsequent hydrodynamic,stationary wear,and progressive wear *** hydrodynamic operation leads to an infinite lifetime,the method is successfully applied to predict RUL in cases with stationary and progressive wear.

关键词： plain bearings wear modeling remaining useful life prediction Bayesian inference

Smart mid-infrared metasurface microspectrometer gas sensing system

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Microsystems & Nanoengineering 2024年第3期10卷 273-281页

作者： Jiajun Meng Sivacarendran Balendhran Ylias Sabri Suresh k.Bhargava k.nneth B.Crozier School of Physics University of MelbourneVictoriaAustralia Australian Research Council(ARC)Centre of Excellence for Transformative Meta-Optical Systems(TMOS) University of MelbourneVictoriaAustralia Centre for Advanced Materials&Industrial Chemistry(CAMIC) STEM collegeRMIT UniversityVictoriaAustralia Department of Electrical and Electronic Engineering University of MelbourneVictoriaAustralia

Smart,low-cost and portable gas sensors are highly desired due to the importance of air quality monitoring for environmental and defense-related ***,electrochemical and nondispersive infrared(IR)gas sensors are designed to detect a single specific *** IR spectroscopy-based sensors provide superior performance,their deployment is limited due to their large size and high *** this study,a smart,low-cost,multigas sensing system is demonstrated consisting of a mid-infrared microspectrometer and a machine learning *** microspectrometer is a metasurface filter array integrated with a commercial IR camera that is consumable-free,compact(~1 cm^(3))and lightweight(~1 g).The machine learning algorithm is trained to analyze the data from the microspectrometer and predict the gases *** system detects the greenhouse gases carbon dioxide and methane at concentrations ranging from 10 to 100%with 100%*** also detects hazardous gases at low concentrations with an accuracy of 98.4%.Ammonia can be detected at a concentration of 100 ***,methyl-ethyl-k.tone can be detected at its permissible exposure limit(200 ppm);this concentration is considered low and *** study demonstrates the viability of using machine learning with IR spectroscopy to provide a smart and low-cost multigas sensing platform.

关键词： Smart gases system

Traumatic lumbar hernia: A systematic review of the literature

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Chinese Journal of Traumatology 2024年第1期27卷 53-57页

作者： Ioannis Tsouk.idas Nik.laos Tasis Maria Ioanna Antonopoulou Vasileios Acheimastos Dimitrios k.anatak.s Department of Surgery Stony Brook University HospitalStony BrookNew YorkUSA Department of Surgical Oncology St Savvas Cancer HospitalAthensGreece nd Department of Surgery Athens Naval and Veterans HospitalAthensGreece Department of Surgery Naval Hospital of CreteChaniaGreece

Purpose:Traumatic lumbar hernia(TLH)constitutes a protrusion of content through a defect in the posterior abdominal wall,as a result of *** rare entity has been described in limited number of ***:A systematic review of the literature was performed according to the meta-analysis of observational studies in epidemiology *** English literature from 1990 until 2021 was reviewed,using PubMed,EMBASE and Google Scholar bibliographic databases,to identify case reports and case series with patients that were diagnosed with *** each eligible study,demographics,clinical presentation,hernia characteristics,preoperative imaging investigations,operation details,and postoperative data were extracted for *** analysis was performed on SPSS,version ***:A total of 62 studies were included for review,with 164 patients with *** age was(42.6±14.3)years(47.6%males,31.1%females,gender not specified in 35 cases).Mean diameter of hernia neck.was(6.3±3.1)cm,while the triangles of Petit and Grynfeltt were affected in 74.5%and 14.6%,*** diagnosed in the emergency setting account for 54.2%,with CT scan establishing diagnosis in all but one case(97.7%).A delayed diagnosis was made in 45.8%,at a mean 1 year following *** bulging(82.8%)and chronic back.pain(34.3%)were the most frequent *** both delayed and acute group,open surgery(63.6%and 92.3%,respectively)was the preferred surgical *** complications were reported in 11.4%of acute and 15.0%of delayed *** recurrence was 7%.Conclusions:TLH is uncommon with 164 cases described since *** scan is the gold standard in *** surgery is generally the preferred approach,particularly in the emergency *** TLH can be treated either by primary suture repair or mesh,depending on the local conditions,whereas delayed cases usually require a mesh.

关键词： Lumbar hernia Petit Grynfeltt Traumatic lumbar hernia Trauma