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Transactions of Nonferrous Metals society of China 2014年第7期24卷 2301-2306页

作者：查敏李彦军 Ragnvald MATHIEsEN ruben BJRGE Hans J. ROVEN Department of Materials science and Engineering Norwegian University of Science and Technology Department of Physics Norwegian University of Science and Technology Center for Advanced Materials Qatar University

A binary Al-7Mg alloy was processed by equal channel angular pressing （ECAP） at room temperature via route Bc, combined with intermediate annealing. After 6 passes, a high hardness of HV218 is achieved. Transmission electron microscopy （TEM） observations demonstrate that ECAP leads to a significant grain refinement and ultrafine grains down to 100-200 nm are developed after 5 or 6 passes. X-ray diffraction （XRD） analysis indicates that the major part of Mg atoms are in solid solution in the deformed material, and the possible strengthening effect of Mg solute atom clusters or precipitates is neglected. The high hardness of the 6 pass-treated materials comes mainly from grain boundary strengthening, which contributes about 41% to the total strength, while dislocations and Mg solid solution contribute about 24% and 35% to the remaining strength, respectively. Also, the thermal stability of this severely deformed material was investigated by hardness measurements. The material is relatively stable when annealed at a temperature lower than 250 ℃, while annealing at 300 ℃ leads to a rapid softening of the material.

关键词： Al-Mg alloys equal channel angular pressing (ECAP) as-deformed microstructure hardness evolution strengthening thermal stability

Nanoparticle-linked antagonist for leptin signaling inhibition in breast cancer

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World Journal of Clinical Oncology 2017年第1期8卷 54-66页

作者： Tia Harmon Adriana Harbuzariu Viola Lanier Crystal C Lipsey Ward Kirlin Lily Yang ruben R Gonzalez-Perez Department of Microbiology Biochemistry and Immunology Morehouse School of Medicine Department of Pathology and Laboratory Medicine Emory University School of Medicine

AIM To develop a leptin peptide receptor antagonist linked to nanoparticles and determine its effect on viability of breast cancer *** The leptin antagonist, LPrA2, was coupled via EDAC [1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide] to iron oxide nanoparticles(IONP-LPrA2) to increase its ***-LPrA2 conjugation was confirmed by Western blot and nanoparticle tracking *** triple negative breast cancer(TNBC) MDA-MB-231, HCC1806 and estrogen receptor positive(ER+) MCF-7 cells were analyzed for the expression of the leptin receptor, *** effects of leptin and antagonist on levels of leptin-induced sTAT3 phosphorylation and cyclin D1, cell cycle progression, cell proliferation, and tumorsphere formation in breast cancer cells were *** of the chemotherapeutics [cisplatin(Cis), cyclophosphamide(CTX), doxorubicin(Dox) and paclitaxel(PTX)] to effectively reduce cell viability were *** effects of combination treatments of IONP-LPrA2 and chemotherapeutics on cell viability were *** Western blot analysis of coupling reaction products identified IONP-LPrA2 at approximately 100 ***2 significantly decreased leptin-induced p sTAT3 levels in HCC1806 cells and drastically decreased cyclin D1 levels in all cell ***-LPrA2 significantly reduced leptin-induced s phase progression and cell proliferation in all breast cancer cell lines and the formation of tumorspheres in MDA-MB-231 ***, IONP-LPrA2 showed an additive effect on the reduction of breast cancer cell survival with *** plus IONP-LPrA2 produced a significant reduction in the survival of MDA-MB-231 and HCC1806 *** plus IONP-LPrA2 caused a significant decrease in the survival of MDA-MB-231 *** plus IONP-LPrA2 caused a marked reduction in the survival of HCC1806 ***, PTX plus IONP-LPrA2 did not have a major effect on the viability of the breast cancer cells when compared to PTX *** Prese

关键词： Triple negative breast cancer Obesity Leptin Leptin peptide receptor antagonist 2 Iron oxide nanoparticles Chemotherapy adjuvant

smart society and Artificial Intelligence:Big Data scheduling and the Global standard Method Applied to smart Maintenance

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Engineering 2020年第7期6卷 835-846页

作者： ruben Foresti stefano Rossi Matteo Magnani Corrado Guarino Lo Bianco Nicola Delmonte Department of Medicine and surgery University of ParmaParma 43126Italy sidel s.p.a. Parma 43126Italy Department of Engineering and Architecture University of ParmaParma 43124Italy Center for Research in Toxicology(CERT) University of ParmaParma 43126Italy

The implementation of artificial intelligence(AI)in a smart society,in which the analysis of human habits is mandatory,requires automated data scheduling and analysis using smart applications,a smart infrastructure,smart systems,and a smart *** this context,which is characterized by a large gap between training and operative processes,a dedicated method is required to manage and extract the massive amount of data and the related information *** method presented in this work aims to reduce this gap with near-zero-failure advanced diagnostics(AD)for smart management,which is exploitable in any context of society 5.0,thus reducing the risk factors at all management levels and ensuring quality and *** have also developed innovative applications for a humancentered management system to support scheduling in the maintenance of operative processes,for reducing training costs,for improving production yield,and for creating a human–machine cyberspace for smart infrastructure *** results obtained in 12 international companies demonstrate a possible global standardization of operative processes,leading to the design of a near-zero-failure intelligent system that is able to learn and upgrade *** new method provides guidance for selecting the new generation of intelligent manufacturing and smart systems in order to optimize human–machine interactions,with the related smart maintenance and education.

关键词： smart maintenance smart society Artificial intelligence Human-centered management system Big data scheduling Global standard method society 5.0 Industry 4.0

Does topical vancomycin prevent fracture-related infections in closed fractures undergoing open reduction and internal fixation?A randomised controlled trial

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Chinese Journal of Traumatology 2024年第2期27卷 71-76页

作者： Mohit Gandhi Gopisankar Balaji Jagdish Menon ruben Raj Thomas Department of Orthopaedics Jawaharlal Institute of Postgraduate Medical Education and ResearchPondicherryIndia Department of Preventive and social Medicine Jawaharlal Institute of Postgraduate Medical Education and ResearchPondicherryIndia

Purpose:The role of topical vancomycin in fracture-related infection(FRI)is *** few studies have reported their efficacy in open and high-risk extremity *** study aimed to assess topical vancomycin's role in reducing FRI in closed fractures undergoing open surgical intervention with an ***:This prospective randomized cohort study was carried out between February 2021 to January *** with isolated closed fractures,who were planned for open reduction and internal fixation within 2 weeks from the time of injury were included for this *** data collected included age,gender,socioeconomic status,mechanism of injury,diagnosis,Tscherne classification,and time interval to take up for *** were randomized into the intervention and control groups using the block randomization *** control group received only systemic antibiotic prophylaxis,whereas the intervention group received topical application of vancomycin powder in the surgical wound alongside systemic antibiotic *** primary outcome measure was the incidence of FRI among these *** and radiological findings and culture reports(in cases with infection)were recorded during the post-operative period and at 6 weeks of *** relevant statistical calculations were done using sTATA statistical/data analysis-parallel edition version 16.0(stataCorp LLC).The quantitative variables like age and duration of the surgery were assessed for normalcy by shapiro-Wilk W *** independent samples t-test with equal variances was applied to the age ***'s exact test was used for the analysis of the primary outcome measure(presence of FRI following surgery),and"Risk of FRI"and"Risk difference"between the 2 groups was *** strength of the association between qualitative variables was assessed using the Fisher's exact and Chi-square tests,***:There were 88 patients included in this *** statistical si

关键词： Infections Antibiotics Vancomycin Fractures

Tropical tree community composition and diversity variation along a volcanic elevation gradient

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Journal of Mountain science 2022年第12期19卷 3475-3486页

作者： ruben MARTINEZ-CAMILO Manuel MARTINEZ-MELENDEZ Nayely MARTINEZ-MIELENDEZ Derio Antonio JIMENEZ-LOPEZ Mauricio JOsE-RIOs Unidad Villa Corzo Facultad de IngenieríaUniversidad de Ciencias y Artes de Chiapas30520 Villa CorzoChiapasMexico Instituto de Ciencias Biológicas Universidad de Ciencias y Artes de Chiapas29039 Tuxtla GutiérrezChiapasMexico Eizia A.C. 29045 Tuxtla GutiérrezChiapasMexico Departamento de Conservación de la Biodiversidad El Colegio de la Frontera Sur29290 San Cristóbal de las CasasChiapasMexico Orquidiario y Jardín Botánico de Comitán Secretaría de Medio Ambiente e Historia Natural30106 Comitán de DomínguezChiapasMexico Instituto de Investigación en Gestión de Riesgos y Cambio Climático Universidad de Ciencias y Artes de Chiapas29039 Tuxtla GutiérrezChiapasMexico

Unraveling the factors that determine variation of diversity in tropical mountain systems is a topic for debate in plant *** is especially true in areas where topography is complex due to volcano elevational gradients and where forests are vulnerable to human *** this study we used a set of climatic(temperature,rainfall,and radiation solar),topographic(elevation,slope aspect,and slope orientation)and human disturbance variables to determine their effect on diversity and composition patterns of a tree community,considering three slope aspects of a tropical volcano in southeastern *** sampled trees in seventy 0.1-ha plots distributed on three slope aspects of the Tacanávolcano along an elevational gradient of 1500 to 2500 *** determined diversity patterns(general tree richness,exponential of shannon index,and pioneer species richness)with linear regression models,and for beta diversity,we used a dissimilarity index(within and between elevational bands 100 m wide).The effect of a set of environmental and human disturbance variables on tree diversity and community composition was analyzed with general linear models and multivariate analyses,*** registered 2,949 individual trees belonging to 176 species and *** average species richness and alpha diversity per plot were 13(standard deviation±6)and 9(±5),*** tree richness and alpha diversity increased in the middle part(unimodal patterns)of the elevational gradient,but pioneer species richness decreased linearly with *** variance explained by general linear models was greater in richness(32%)than in alpha diversity(25.3%).The most important predictor variables were temperature(elevational gradient),which explained the unimodal pattern(richness and alpha diversity increase at intermediate levels of temperature),and slope orientation,which explained the increase in richness and alpha diversity toward the geographic *** temperature had a signific

关键词： Composition Environmental gradient Tree diversity patterns Tropical humid cloud forest Tropical volcanoes