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Prediction of Forming Limit diagrams for Materials with HCP Structure

Acta Metallurgica Sinica(English Letters) 2015年第12期28卷 1442-1451页

作者： Sheng-Hua Wu Nan-Nan Song Francisco M.Andrade Pires abel d.santos Faculty of Engineering University of Porto INEGI University of Porto

The forming limit diagram（FLd） is an important tool to be used when characterizing the formability of metallic sheets used in metal forming processes. Experimental measurement and determination of the FLd is timeconsuming and therefore the analytical prediction based on theory of plasticity and instability criteria allows a direct and efficient methodology to obtain critical values at different loading paths, thus carrying significant practical ***, the accuracy of the plastic instability prediction is strongly dependent on the choice of the material constitutive model [1–3]. Particularly for materials with hexagonal close packed（HCP） crystallographic structure, they have a very limited number of active slip systems at room temperature and demonstrate a strong asymmetry between yielding in tension and compression [4, 5]. Not only the magnitude of the yield locus changes, but also the shape of the yield surface is evolving during the plastic deformation [4]. Conventional phenomenological constitutive models of plasticity fail to capture this unconventional mechanical behavior [4, 6]. Cazacu and Plunkett [6] have proposed generic yield criteria, by using the transformed principal stress, to account for the initial plastic anisotropy and strength differential（Sd） effect simultaneously. In this contribution, a generic FLd MATLAB script was developed based on Marciniak–Kuczynski analytical theory and applied to predict the localized necking. The influence of asymmetrical effect on the FLd was evaluated. Several yield functions such as von Mises, Hill, Barlat89, and Cazacu06 were incorporated into analysis. The paper also presents and discusses the influence of different hardening laws on the formability of materials with HCP crystal structures. The findings indicate that the plastic instability theory coupled with Cazacu model can adequately predict the onset of localized necking for HCP materials under different strain paths.

关键词： Forming limit diagram(FLd) Marciniak–Kuczynski analysis Plastic instability Yield function Hardening law

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Modeling of Fluidized Bed Gasification:Assessment of Zero-dimensional and CFd Approaches

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Journal of Thermal Science 2015年第4期24卷 378-385页

作者： Nuno Couto Valter Silva Eliseu Monteiro P.S.d.Brito abel Rouboa University of Tras-os-Montes and Alto douro INEGI/Faculty of Engineering University of Porto C3i-Interdisciplinary Center for Research and Innovation Polytechnic Institute of PortalegreLugar da AbadessaApartado 1487301-901PortalegrePortugal MEAM department University of Pennsylvania

In modeling fluidized bed gasification experiments,equilibrium and CFd models are valuable *** existence of multi-dimensional effects inside the reactor vessel due to the kinetics of the process and the fluid dynamics phenomena could result in deviation from the zero-dimensional *** models integrating kinetics and hydrodynamics are being developed by using a computer fluid dynamics(CFd)*** objective of this investigation is to assess and compare the adequacy of zero-dimensional and CFd approaches in modeling fluidized bed gasification regarding a semi-industrial scale(numerical results are validated under experimental runs).Results show that the zero-dimensional model based on the approach of dual stage equilibrium performs reasonably well in adequately predicting the product gas composition at different operating conditions and for different feedstocks,although with quantitative ***,the discrepancy depends on the oxygen content of the oxidation agent and on the steam-to biomass ratio decreasing when these parameters *** models provide deeper information being able to estimate the syngas composition or other operating parameter at any point of space and *** of some quantitative discrepancy,the zero-dimensional modeling approach is deemed satisfactory from the viewpoint of the determining design conditions simulation.

关键词： Gasification CFd model dual stage equilibrium model

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determination of the physical and interaction properties of sorghum grains:Application to computational fluid dynamics-discrete element method simulations of the fluid dynamics of a conical spouted bed

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Particuology 2021年第1期19卷 91-101页

作者： J.N.M.Batista d.A.santos R.Bettega Federal University of São Carlos Department of Chemical EngineeringSPBrazil Institute of Chemistry Federal University of GoiásGOBrazil

Computational simulation is an important tool for design and improvement of industrial *** fluid dynamics(CFd)coupled with the discrete element method(dEM)has been applied to simulate drying equipment that usually involves gas-solid *** reliable results of CFd-dEM simulations,the properties related to the interactions of the material within the industrial equipment,such as the restitution or friction coefficients,must be *** this study,CFd-dEM was applied to simulate the fluid dynamics inside a conical spouted bed operating with sorghum *** physical properties of the particulate phase and the particle-particle and particle-wall interaction parameters were determined by the direct measurement approach and applied to *** interaction parameters were experimentally determined,including the particle-particle interaction parameters ofη=0.46,μ^(S)=0.79,andμ_(R)=0.70,and the particle-wall interaction parameters ofη=0.56,μ_(S)=0.75,andμ_(R)=*** simulated minimum spouting velocity and characteristic curves were compared with the experimental *** was good agreement between the simulated and experimental results.

关键词： Restitution coefficient Static friction coefficient Rolling friction coefficient CFd dEM

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医学生对人工智能的态度:多中心调查

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国际医学放射学杂志 2019年第3期 373-374页

作者：刘柱娜 d.santos d.Giese S.Brodeh S.Chon W.Staab R.Kleinert department of Radiology University Hospital Cologne

摘要目的评估医学本科生对放射学和医学领域应用人工智能(AI)的态度。材料与方法使用SurveyMonkey设计了一份网络问卷,并分发给3所医学院校的学生。问卷由不

关键词：人工智能 AI 放射学本科生受访者

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Static-based early-damage detection using symbolic data analysis and unsupervised learning methods

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Frontiers of Structural and Civil Engineering 2015年第1期9卷 1-16页

作者： Joao Pedro santos Christian CREMONA Andre d. ORCESI Paulo SILVEIRA Luis CALAdO department of Structures Av. Brasil 101 Lisbon 1700-066 Portugal Technical Center for Bridge Engineering CEREMA B.P. 214 Provins Cedex 77487 France Materials and Structures department IFSTTAR University Paris-Est 14-20 Boulevard Newton Champs sur Marne Marne la Vallee Cedex2 F-77447 France department of Civil Engineering Technical University Lisbon Avenida Rovisco Pais Lisbon 1096 Portugal

A large amount of researches and studies have been recently performed by applying statistical and machine learning techniques for vibration-based damage detection. However, the global character inherent to the limited number of modal properties issued from operational modal analysis may be not appropriate for early-damage, which has generally a local character. The present paper aims at detecting this type of damage by using static SHM data and by assuming that early-damage produces dead load redistribution. To achieve this objective a data driven strategy is proposed, consisting of the combination of advanced statistical and machine learning methods such as principal component analysis, symbolic data analysis and cluster analysis. From this analysis it was observed that, under the noise levels measured on site, the proposed strategy is able to automatically detect stiffness reduction in stay cables reaching at least 1%.

关键词： structural health monitoring early-damage detection principal component analysis symbolic data symbolic dissimilarity measures cluster analysis numerical model damage simulations

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Peripheral clonal selection shapes the human γδ T-cell repertoire

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Cellular & Molecular Immunology 2017年第9期14卷 733-735页

作者： Biagio di Lorenzo Julie déchanet-Merville Bruno Silva-santos Instituto de Medicina Molecular Faculdade de MedicinaUniversidade de Lisboa1649-028 LisbonPortugal Instituto Superior Tecnico Universidade de Lisboa1649-028 LisbonPortugal ImmunoConcept CNRS UMR 5164Equipe Labelisée Ligue Contre le CancerUniversity of BordeauxF-33000 BordeauxFrance

γδT cells are often placed at the interface between innate and adaptive *** cells share T-cell receptor(TCR)rearrangements and memory functions1 in common with theirαβT-cell counterparts but differ in terms of the... 详细信息

关键词： Figure kinetics selection

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Surgical treatment of Lenke 5 adolescent idiopathic scoliosis: Comparison of anterior vs posterior approach

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World Journal of Orthopedics 2016年第9期7卷 553-560页

作者： Mark F abel Anuj Singla Mark A Feger Lindsay d Sauer Wendy Novicoff department of Orthopedic Surgery University of Virginia

AIM To compare the posterior vs anterior approaches for fusion of Lenke 5 adolescent idiopathic scoliosis curves,matched for curve magnitude and for the distal level of fixation(dLOF) standardized to the third lumbar vertebrae(L3).METHOdS A prospectively collected multicenter database was used for this retrospective comparative study. Our dependent variables included sagittal and coronal radiographic measurements, number of fused vertebrae, estimated blood loss, length of hospitalization and SRS total and individual domain scores at the two-year follow-up. Subject demographics were similar for all group *** t-test was used to compare groups for all analyses at P d cases of Lenke 5 curves, a selective approach was used only 50% of the time in cases undergoing a posterior fusion. When comparing a posterior selective approach to an anterior selective approach,surgeons utilizing a posterior approach fused significantly more levels than surgeons using an anterior approach with no other significant differences in radiographic or SRS outcomes(Ant = 4.8 ± 1.0 levels vs post = 6.1 ± 1.0 levels, P dLOF was standardized to L3, the anterior approached provided significantly greater lumbar Cobb percent correction than the posterior approach(Ant = 69.1% ± 12.6% vs post =54.6% ± 16.4%, P = 0.004), with no other significant radiographic or SRS score differences between *** Surgeons treating Lenke 5c curves with a posterior instrumentation and fusion vs an anterior approach include more motion segments, even with a selective fusion. When controlled for the distal level of fixation,the anterior approach provides greater correction of the thoracolumbar curve.

关键词： Instrumentation Thoracolumbar curve Selective fusion

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Nutritional Screening in a University Hospital:Comparison between Oncologic and Non-Oncologic Patients

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Food and Nutrition Sciences 2015年第1期6卷 75-82页

作者： Selma F.C.Cunha Lidiane S.Tanaka Roberta G.Salomao danielle M.Macedo Thatiane d.santos Fernanda M.Peria division of Clinical Nutrition Department of Internal MedicineSchool of Medicine of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil Parenteral and Enteral Nutrition Team of Clinical Hospital School of Medicine of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil division of Oncology Department of Internal MedicineSchool of Medicine of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil

Background & Aims: We compared the screening nutritional data of patients with malignant and non-malignant disease, and classified their nutritional risk according to the primary tumor’s site. Methods: Subjective Global Assessment was applied to 3008 patients within 48 h of admission to a public university. Subjects were divided into Oncologic Group (n = 576) or Non-Oncologic Group (n = 2432) according to the presence of neoplasms or other diseases respectively. These data were compared by the t-student test and classic chi-square test, with statistical significance set at p d a higher prevalence of weight loss (60.3% vs. 49.3%), quantitative (40.7% vs. 28.5%) and qualitative (16.4% vs. 7.6%) alterations in the food intake pattern, gastrointestinal symptoms and muscle waste (23.2% vs. 13.2%) as compared to the Non-Oncologic Group. Also, there was a higher prevalence of nutritional disturbances in the Oncologic Group, with 49.5% of the subjects moderately (or suspected to be malnourished) and 12.7% severely mal-nourished. Severe malnourishment was mainly observed in patients with head and neck (25%), upper digestive tract (21.9%) and soft tissue and bones (17.9%) tumors. Conclusion: When compared to other hospitalized patients, patients with neoplastic disease were in higher nutritional risk.

关键词： Nutritional Screening Malnutrition Subjective Global Assessment Hospital Setting Neoplasia

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ePROMs in the End of Life and in Making Ethical decisions. An Integrative Review with Narrative

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Journal of Biomedical Science and Engineering 2022年第4期15卷 109-128页

作者： Nuno Miguel Moreira santos abel García Abejas Àngels Salvador Vergès Faculty of Health Sciences University of Beira Interior (UBI) Covilh&#227 Portugal Hospital Lusíadas Lisbon Portugal SITT Ethics Group (GES) Spain/Portugal Board of directors of the Iberian Society of Telemedicine and Telehealth SITT Spain/Portugal

Background: Patient-reported outcome measures (PROMS) are essential tools in clinical practice and research to assess patients’ needs from their unique perspectives. They allow the healthcare team to monitor patient status and concerns outside the clinical setting. However, the real innovation in this field is its digitization: electronic patient-reported outcome measures (ePROMs). Aims: This review aimed to get an overview of whether these new technologies are being used to aid palliative care teams in their daily struggle to provide comfort to their patients. Methods: We conducted a systematic review of articles retrieved from PubMed and Web of Science, up to November 2021. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. The search strategy yielded 242 records, of which 13 met the predefined inclusion and exclusion criteria. In addition, relevant information related to ePROMs was extracted from each study. Results: Outcomes were grouped into the quality of life assessment, symptom burden and simple assessments, and the decision to introduce Palliative Cures (PC). In 61.5% of cases, ePROMs positively impacted patients’ quality of life. Furthermore, in 46.15% of cases, ePROMs led Primary Care (PC) teams to make an ethical decision;the same relative value as in the circumstances did not define the direction in ethical terms. Conclusion: Remind professionals and patients that these tools exist and can be applied in many situations. If used correctly, they can provide patients with a better quality of life and more complete information for professionals.

关键词： ePROMs Palliative Care Systematic Review Quality of Life End of Life decision Making

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Influence of Agro Ecology on Rice Varietal Resistance to <i>Sitophilus oryzae</i>(Coleoptera: Curculionidae) and <i>Sitotroga cerealella</i>(Lepidoptera: Gelechiidae) in Benin

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American Journal of Plant Sciences 2015年第18期6卷 2832-2843页

作者： Carline santos Clement Agbangla daniel Chougourou Antoine abel Missihoun Corneille Ahanhanzo department of Genetics and Plant Breeding University of Abomey-Calavi (UAC) Abomey-Calavi Benin department of Management of Environment Polytechnic School of Abomey-Calavi (EPAC) University of Abomey-Calavi (UAC) Abomey-Calavi Benin

The rice weevil, Sitophilus oryzae (L.) and the Angoumois grain moth, Sitotroga cerealella (Oliv.), are serious pests of stored rice in Africa. This study aims to evaluate the influence of growing environments to rice resistance to these pests. Thus, eleven rice varieties including 6 upland NERICA, 2 Oryza glaberrima and 3 O. sativa were grown at four agro ecological zones of Benin. After harvest, samples of 1500 grains of each genotype were infested with 20 adults of S. oryzae (10 males and 10 females) and 1500 additional ones were infested with 50 eggs of S. cerealella. Results showed significant effect of agro ecological zones on pest incidence and on varietal resistance as well. O. glaberrima varieties (TOG 5681 and CG 14) were the most resistant in each location whereas the resistance of NERICA and Sativa varieties varied from tolerant to susceptible according to the growing ecology. This result highlights the impact of growing environment on rice resistance status and will provide the best advice to farmers on how to choose best genetic material according to cropping ecology.

关键词： Rice Agro Ecology Storage Pests Resistance Habitat Management

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