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Predicting surface deformation during mechanical attrition of metallic alloys

npj Computational Materials 2019年第1期5卷 843-857页

作者： Shan cecilia Cao Xiaochun Zhang Jian Lu Yongli Wang San-Qiang Shi Robert O.Ritchie Department of Materials Science&Engineering University of CaliforniaBerkeleyCA 94720USA Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

Extensive efforts have been devoted in both the engineering and scientific domains to seek new designs and processing techniques capable of making stronger and tougher *** such method for enhancing such damage-tolerance in metallic alloys is a surface nano-crystallization technology that involves the use of hundreds of small hard balls which are vibrated using high-power ultrasound so that they impact onto the surface of a material at high speed(termed Surface Mechanical Attrition Treatment or SMAT).However,few studies have been devoted to the precise underlying mechanical mechanisms associated with this technology and the effect of processing *** SMAT is dynamic plastic deformation process,here we use random impact deformation as a means to investigate the relationship between impact deformation and the parameters involved in the processing,specifically ball size,impact velocity,ball density and kinetic *** analytical and numerical solutions,we examine the size of the indents and the depths of the associated plastic zones induced by random impacts,with results verified by experiment in austenitic stainless *** addition,global random impact and local impact frequency models are developed to analyze the statistical characteristics of random impact coverage,together with a description of the effect of random multiple impacts,which are more reflective of *** believe that these models will serve as a necessary foundation for further,and more energy-efficient,development of such surface nano-crystalline processing technologies for the strengthening of metallic materials.

关键词： deformation alloys metallic

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Adolescent health issues:The role of publich health nurses

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Journal of Integrative Nursing 2023年第1期5卷 59-65页

作者： Oladayo Damilola AKINWALE cecilia Bukola BELLO Mayowa Grace ELEMILE Department of Nursing Afe Babalola UniversityAdo-EkitiEkitiNigeria

Adolescent health(AH)is an integral part of public health with the goal of improving the healthy development,safety,and well‑being of adolescents because the behavioral patterns established during this period influence the health status of the adolescents and the risk of developing chronic diseases during *** being a time of great physical and psychological change,many social and physical conditions as well as behavioral pattern can impact AH and heighten the risk of illness and *** makes adolescents to be susceptible to various health issues by nature because of their stages of development,which affects their ability to make safe decisions,and the need to rely on significant others for *** factors like desire for greater autonomy,pressure to conform to peers,exploration of sexual identity,increased access to and use of technology,violence and sexual abuse,social and cultural norms,family circumstances,emotional and physical environment of the adolescents contribute significantly to adolescents’health ***,nurses have significant roles to play to ensure optimal growth and development of the adolescents and to prevent and reduce the impact of changes associated with adolescence on the health and well‑being of the *** article presents the concept of adolescence,components of AH,health‑related challenges associated with adolescence,and role of public health nurses.

关键词： Adolescence emerging nurses public health

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Lignocellulosic Micro and Nanofibrillated Cellulose Produced by Steam Explosion for Wood Adhesive Formulations

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Journal of Renewable Materials 2022年第2期10卷 263-271页

作者： Saad Nader Felipe Guzman Raphael Becar Cesar Segovia cecilia Fuentealba Miguel Peirera Evelyne Mauret Nicolas Brosse Laboratoire d’Etude et de Recherches sur le Materiau Bois-Green Process For Wood(LERMaB-GP4W) Facultedes Sciences et TechnologiesUniversitede LorraineVandœuvre-les-NancyFrance Laboratoire de Genie des Procedes Papetiers(LGP2) Saint Martin D’HèresFrance Unidad de Desarrollo Tecnologico(UDT) Universidad de ConcepcionCoronelChile Centre d’Essais TEchnique LORrain(CETELOR) EpinalFrance

The reinforcing impact of Lignocellulosic micro and nanofibrillated cellulose(L-MNFCs)obtained from Eucalyp-tus Globulus bark in Urea-Formaldehyde UF adhesive was tested.L-MNFCs were prepared by an environmentally friendly,low-cost process using a combination process involving steam explosion followed by refining and ultra-fine *** L-MNFCs showed a web-like morphology with some aggregates and lignin *** present a mixture of residual fibers and fine elements with a width varying between 5 nm to 20μm,*** effects of the addition of low amounts of L-MNFCs(1%wt.)on the properties of three different adhe-sives(Urea-Formaldehyde UF,Phenol-Formaldehyde PF,and Tannin-Hexamine TH)were studied by the evolution of the pH,the viscosity,and the mechanical *** showed that the viscosity of PF and UF adhesives increased with the addition of L-MNFCs,unlike ***,the addition led to better mechan-ical behavior for the three *** were then prepared using modified UF with L-MNFCs and *** showed that an amount of 1%*** L-MNFCs was sufficient to increase the internal bonding by≈67%,the modulus of elasticity by≈43%,and the modulus of rupture by≈29%.

关键词： Lignocellulosic microfibrils Eucalyptus globulus bark wood adhesives steam explosion wood panels

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Artificial intelligence for the early detection of colorectal cancer: A comprehensive review of its advantages and misconceptions

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World Journal of Gastroenterology 2021年第38期27卷 6399-6414页

作者： Michelle Viscaino Javier Torres Bustos Pablo Muñoz cecilia Auat Cheein Fernando Auat Cheein Department of Electronic Engineering Universidad Tecnica Federico Santa MariaValpaiso 2340000Chile Hospital Clinico University of ChileSantiago 8380456Chile Facultad de Medicina Universidad Nacional de Santiago del EsteroSantiago del Estero 4200Argentina Department of Electronic Engineering Universidad Técnica Federico Santa MaríaValparaiso 2340000Chile

Colorectal cancer(CRC)was the second-ranked worldwide type of cancer during 2020 due to the crude mortality rate of 12.0 per 100000 *** can be prevented if glandular tissue(adenomatous polyps)is detected *** has been strongly recommended as a screening test for both early cancer and adenomatous ***,it has some limitations that include the high polyp miss rate for smaller(<10 mm)or flat polyps,which are easily missed during visual *** to the rapid advancement of technology,artificial intelligence(AI)has been a thriving area in different fields,including ***,in gastroenterology AI software has been included in computer-aided systems for diagnosis and to improve the assertiveness of automatic polyp detection and its classification as a preventive method for *** article provides an overview of recent research focusing on AI tools and their applications in the early detection of CRC and adenomatous polyps,as well as an insightful analysis of the main advantages and misconceptions in the field.

关键词： Artificial intelligence Machine learning Deep learning Medical images Colorectal cancer Colorectal polyps

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Biomedical applications of the powder-based 3D printed titanium alloys:A review

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Journal of Materials Science & Technology 2022年第30期125卷 252-264页

作者： Amy X.Y.Guo Liangjie Cheng Shuai Zhan Shouyang Zhang Wei Xiong Zihan Wang Gang Wang Shan cecilia Cao Materials Genome Institute Shanghai UniversityShanghai 200444China

3D printing technology is a new type of precision forming technology and the core technology of the third industrial *** powder-based 3D printing technology of titanium and its alloys have received great attention in biomedical applications since its advantages of custom manufacturing,costsaving,time-saving,and resource-saving *** particular,the personalized customization of 3D printing can meet specific needs and achieve precise control of micro-organization and structural *** purpose of this review is to present the most advanced multi-material 3D printing methods for titanium-based *** first reviewed the bone tissue engineering,the application of titanium alloy as bone substitutes and the development of manufacturing technology,which emphasized the advantages of 3D printing technology over traditional manufacturing *** is more,the optimization design of the hierarchical structure was analyzed to achieve the best mechanical properties,and the biocompatibility and osseointegration ability of the porous titanium alloy after implantation in living bodies was ***,we emphasized the development of digital tools such as artificial intelligence,which provides new ideas for the rational selection of processing *** 3D printing titanium-based alloys will meet the huge market demand in the biomedical field,but there are still many challenges,such as the trade-off between high strength and low modulus,optimization of process parameters and structural *** believe that the combination of mechanical models,machine learning,and metallurgical knowledge may shape the future of metal printing.

关键词： The powder-based 3D printing technology Ti-based alloys Biomedical applications Artificial intelligence

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Endoscopic ultrasound in the papilla and the periampullary region

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World Journal of Gastrointestinal Endoscopy 2010年第8期2卷 278-287页

作者： cecilia Castillo Endoscopy Service Latin American Endoscopy Training CenterClínica Alemana de SantiagoUniversidad del Desarrollo

Endoscopic ultrasound (EUS) provides relevant information when an ampullary or periampullary tumor is *** detection, T and N staging and Fine Needle Aspiration plus cithologic confirmation, are some of the expected benefits. Exclusion of benign findings like choledocholithiasis or chronic pancreatitis is also important. A correct understanding of the complex ampullary and periampullary anatomy is needed. Knowledge of the individual clinical history and other previous diagnostic images all contribute to a successful EUS examination. Radial and lineal EUS images are uniquely detailed and, at the moment, it seems to be the best way to exclude or confirm malignant or benign findings. We propose a procedural algorithm, including EUS,for suspected ampullary or periampullary tumors. This review summarizes the vast amount of information to be found spread in the literature, and recognizes this small anatomic area as the origin for a clinical entity with proper clinical presentation, proper imaging and proper therapeutic resolutions. The benefits of performing EUS for its study are highlighted.

关键词： Endoscopic ultrasound Periampullary region Ampulla of Vater Ampuloma Pancreatic cancer

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Insights into the hydrogen evolution reaction in vanadium redox flow batteries:A synchrotron radiation based X-ray imaging study

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Journal of Energy Chemistry 2024年第4期91卷 132-144页

作者： Kerstin Köble Alexey Ershov Kangjun Duan Monja Schilling Alexander Rampf Angelica cecilia TomášFaragó Marcus Zuber Tilo Baumbach Roswitha Zeis Helmholtz Institute Ulm Karlsruhe Institute of Technology89081 UlmGermany Laboratory for Applications of Synchrotron Radiation Karlsruhe Institute of Technology76131 KarlsruheGermany Institute for Photon Science and Synchrotron Radiation Karlsruhe Institute of Technology76344 Eggenstein-LeopoldshafenGermany Department of Electrical Electronicsand Communication EngineeringFaculty of EngineeringFriedrich-Alexander-Universität Erlangen-Nürnberg(FAU)91058 ErlangenGermany Department of Mechanical and Industrial Engineering University of TorontoToronto M5S 3G8OntarioCanada

The parasitic hydrogen evolution reaction(HER)in the negative half-cell of vanadium redox flow batteries(VRFBs)causes severe efficiency ***,a deeper understanding of this process and the accompanying bubble formation is *** benchmarking study locally analyzes the bubble distribution in thick,porous electrodes for the first time using deep learning-based image segmentation of synchrotron X-ray *** large three-dimensional data set was processed precisely in less than one minute while minimizing human errors and pointing out areas of increased HER activity in *** study systematically varies the electrode potential and material,concluding that more negative electrode potentials of-200 m V *** hydrogen electrode(RHE)and lower cause more substantial bubble formation,resulting in bubble fractions of around 15%–20%in carbon felt ***,the bubble fractions stay only around 2%in an electrode combining carbon felt and carbon *** detected areas with high HER activity,such as the border subregion with more than 30%bubble fraction in carbon felt electrodes,the cutting edges,and preferential spots in the electrode bulk,are potential-independent and suggest that larger electrodes with a higher bulk-to-border ratio might reduce HER-related performance *** described combination of electrochemical measurements,local X-ray microtomography,AI-based segmentation,and 3D morphometric analysis is a powerful and novel approach for local bubble analysis in three-dimensional porous electrodes,providing an essential toolkit for a broad community working on bubble-generating electrochemical systems.

关键词： Vanadium redox flow battery Synchrotron X-ray imaging Tomography Hydrogen evolution reaction Gas bubbles Deep learning

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Unraveling molecular interactions in whey protein-kefiran composite films to understand their physicochemical and mechanical properties

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Food Bioscience 2022年第6期50卷 345-354页

作者： Nina Gagliarini cecilia B.Figoli Judith Piermaria Alejandra Bosch Analía G.Abraham Centro de Investigación y Desarrollo en Criotecnología de Alimentos- CIDCA (CCT-CONICET La Plata UNLPCIC-PBA)47 y 1161900La PlataArgentina Laboratorio de Bioespectroscopía CINDEFI (CCT-CONICET La PlataUNLPCIC-PBA)50 y 1151900La PlataArgentina Área Bioquímica y Control de Alimentos Facultad de Ciencias ExactasUNLP47 y 1151900La PlataArgentina

To enhance health promoting properties of edible whey protein films,the inclusion of kefiran to develop composite films was *** and mechanical properties of films prepared with different wpi:kefiran ratios,different percentage of plasticizer and subjected or not to a heat treatment were *** inter-and intra-molecular interactions produced by the incorporation of kefiran into whey-protein films were studied to understand the effect exerted by kefiran on the protein network that may affect the properties of the ***-scanning-calorimetry and Fourier-transform–infrared-spectroscopy studies revealed that kefiran does not affect proteins denaturation,but rather modifies protein-protein interactions in the films,exhibiting a change in wpi secondary structure and a drop in films'melting *** wpi:kefiran films had higher opacity,lower water content and lower water activity compared to single wpi *** of kefiran into the films decreases tensile strength and elastic modulus and produces an increment in the elongation at break *** was confirmed that the addition of a whey-protein denaturation step produces an improvement in the protein network that is crucial for the mechanical behavior of the *** the molecular interactions within composite films greatly aids in obtaining novel formulations with tailor-made physicochemical properties.

关键词： Edible films Kefiran Whey-proteins Interactions Biomaterials

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Value of autopsy in the modern age:Discrepancy between clinical and autopsy diagnoses

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World Journal of Experimental Medicine 2024年第4期14卷 129-135页

作者： cecilia Salzillo Roberta Basile Gerardo Cazzato Giuseppe Ingravallo Andrea Marzullo Department of Precision and Regenerative Medicine and Ionian Area Pathology UnitUniversity of Bari“Aldo Moro”Bari 70121Italy Department of Experimental Medicine PhD Course in Public HealthUniversity of Campania“Luigi Vanvitelli”Naples 80138Italy Course in Biomedical Laboratory Technique University of Bari“Aldo Moro”Bari 70121Italy

BACKGROUND Autopsy is a medical procedure that consists of the examination of the corpse to determine the cause of death and obtain information on pathological conditions or *** recent years,there has been a reduction in hospital autopsies and an increase in forensic *** To evaluate the utility of autopsy in the modern age and the discrepancy between clinical and autopsy *** A retrospective observational study was conducted on the reports of all 645 hospital autopsies performed at Polyclinic of Bari from 2006 to *** Group A,2006-2009,174 cases were studied:58%male,58%adults,55%neonatology;pulmonary disease was the cause of death in 23%of cases;and there was a discrepancy between clinical and autopsy diagnosis in 55%of *** B,2010-2013,119 cases:52%male,46%infants,48%neonatology;pulmonary disease was the cause of death in 25%of cases;and there was a discrepancy between clinical and autopsy diagnosis in 56%of *** C,2014-2017,168 cases:sex equality,37%infants,25%gynecology;pulmonary disease was the cause of death in 24%of cases;and there was a discrepancy between clinical and autopsy diagnosis in 58%of *** D,2018-2021,184 cases:56%male,38%adult,32%gynecology;pulmonary disease was the cause of death in 27%of cases;and there was a discrepancy between clinical and autopsy diagnosis in 58%of *** The study of hospital autopsies reveals a 56.75%discrepancy between clinical diagnosis and autopsy,highlighting the importance of autopsies,especially for fetal and neonatal diseases,which represent 59%of cases.

关键词： Hospital autopsy Modern age Clinical diagnosis Autopsy diagnosis Public health

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Timing of pubertal development in boys born with cryptorchidism and hypospadias:a nation wide cohort study

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Asian Journal of Andrology 2019年第6期21卷 551-556页

作者： Linn Hakonsen Arendt Andreas Ernst Lea Lykke Braskhoj Lauridsen Nis Brix Jorn Olsen cecilia Host Ramlau-Hansen Department of Public Health Section for EpidemiologyAarhus UniversityAarhus 8000Denmark Perinatal Epidemiology Research Unit Department of Paediatric and Adolesce nt Medici neAarhus Un iversity HospitalAarhus 8000Den mark Department of Clin ical Epidemiology Aarhus University HospitalAarhus 8000Denmark.

Pubertal development may be altered in boys with cryptorchidism and hypospadias,but existing kno wledge is inc on siste ***,we investigated the association between cryptorchidism and hypospadias and pubertal development in a large cohort *** in the Puberty Cohort,a cohort nested within the Danish National Birth Cohort,were in eluded in this *** on cryptorchidism and hypospadias was retrieved from the Danish National Patient *** 11 years until 18 years or full pubertal developme nt,info rmatio n on physical markers of pubertal developme nt was provided biannu ally,in eluding Tanner stages,axillary hair,acne,voice break,and first *** multivariate regression models for interval censored data,the mean(95%confidence intervals[Cis])d iff ere nces in months in obtaining the pubertal markers between boys with and without the anomalies were *** 7698 boys,196(2.5%)had cryptorchidism and 60(0.8%)had *** with hypospadias experienced first ejaculation and voice break 7.7(95%Cl:2.5-13.0)months and 4.5(95%Cl:0.3-8.7)months later than boys without hypospadias?The age at attaining the Tanner stages for gonadal and pubic hair growth was also higher,though not statistically *** development seemed unaffected in boys with mild as well as severe cryptorchidism?In conclusion,hypospadias may be associated with delayed pubertal development,but pubertal development seems unaffected by *** relation between hypospadias and later pubertal development may be due to the underlying shared in utero risk or genetic factors.

关键词： congenital abnormalities cryptorchidism hypospadias prenatal exposure delayed effects puberty Tanner stages

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