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Seismic performance of a reinforced concrete building retrofitted with self-centering shape memory alloy braces

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Earthquake Engineering and Engineering Vibration 2022年第3期21卷 785-809页

作者： Massimiliano Ferraioli antonio Concilio Carmine Molitierno Department of Engineering University of Campania“Luigi Vanvitelli”via Roma 2981031 Aversa(CE)Italy Adaptive Structures Div. the Italian Aerospace Research Centre(CIRA)via Maiorise81043 Capua(CE)Italy Department of Structures for Engineering and Architecture University of Naples“Federico Ⅱ”via Claudio 2180125NapoliItaly

Self-centering earthquake-resistant structures have received increased attention due to their ability to reduce post-earthquake residual deformations and,thus,repair time and *** stimulated the development of recentering shape memory alloy(SMA)dampers that use superelastic nitinol wires to dissipate energy and self-center the ***,there are still a few case studies applications on full-scale RC buildings in the ***,general guidelines or even simplified approaches for the practical design of SMA damped braces are still *** paper focuses on evaluating the effect of using self-centering shape memory alloy dampers for buckling-restrained braces applied for the seismic retrofit of a complex RC building structure.A design method originally proposed for elastoplastic dampers was implemented to size the SMA dampers to be placed on selected spans and stories of a *** effectiveness of the design procedure was demonstrated by nonlinear time-history analyses under different sets of earthquake strong ground *** analysis results show that the recentering shape memory alloy bracing system is effective in limiting the maximum transient inter-story drifts and reducing the residual inter-story drifts after strong seismic events,due to its excellent recentering behavior together with its not negligible energy dissipation capacity.

关键词： RC buildings seismic retrofit buckling-restrained braces shape memory alloys dampers self-centering

Mechanics of tubular helical assemblies:ensemble response to axial compression and extension

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Acta Mechanica Sinica 2021年第2期37卷 173-186页

作者： Jacopo Quaglierini Alessandro Lucantonio antonio DeSimone Department of Excellence in Robotics and AI The BioRobotics InstituteScuola Superiore Sant'Anna56127 PisaItaly SISSA-Scuola Intemazionale Superiore di Studi Avanzati 34136 TriesteItaly

Nature and technology often adopt structures that can be described as tubular helical ***,the role and mechanisms of these structures remain *** this paper,we study the mechanical response under compression and extension of a tubular assembly composed of 8 helical Kirchholf rods,arranged in pairs with opposite chirality and connected by pin joints,both analytically and *** first focus on compression and find that,whereas a single helical rod would buckle,the rods of the assembly deform coherently as stable helical shapes wound around a common ***,we investigate the response of the assembly under different boundary conditions,highlighting the emergence of a central region where rods remain circular ***,we study the effects of different hypotheses on the elastic properties of rods,i.e.,stress-free rods when straight versus when circular helices,Kirchhoff’s rod model versus Sadowsky’s ribbon *** up,our findings highlight the key role of mutual interactions in generating a stable ensemble response that preserves the helical shape of the individual rods,as well as some interesting features,and they shed some light on the reasons why helical shapes in tubular assemblies are so common and persistent in nature and technology.

关键词： Computational mechanics Helical assemblies Kirchhoff rod Sadowsky ribbon Ensemble response

Ligninolytic Peroxidase-Like Activity of a Synthetic Metalloporphine Immobilized onto Mercapto-Grafted Crosslinked PVA Inspired by the Active Site of Cytochrome P450

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催化学报 2011年第11期32卷 1663-1666页

作者： Paolo ZUCCA antonio RESCIGNO Enrico SANJUST Dipartimento di Scienze e Tecnologie Biomediche Università di Cagliari Monserrato 09042 Italy Consorzio per lo Sviluppo dei Sistemi a Grande Interfase Sesto Fiorentino 50019 Italy

A synthetic metalloporphine was immobilized onto a PVA-based and mercapto-grafted solid support, emulating the active site of cytochrome P450. Its ligninolytic peroxidase-like catalytic activity was studied. The coordinated mercapto ligand significantly affected the catalytic features of the catalyst because the oxidation of lignin-model compounds was very slow by comparison with imidazoleand pyridine-coordinated immobilized metalloporphines. Conversely, the catalyst efficiently bleached several industrial dyes and thus demonstrated promising activity for this application. Based on this altered substrate specificity the oxygen-donor catalytic route seems to be more favorable than a single electron oxidation pathway.

关键词： porphine porphyrin lignin peroxidase cytochrome P450 biomimetic

Hybrid first and second order attention Unet for building segmentation in remote sensing images

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Science China(Information Sciences) 2020年第4期63卷 69-80页

作者： Nanjun HE Leyuan FANG antonio PLAZA College of Electrical and Information Engineering Hunan University Hyperspectral Computing Laboratory Department of Technology of Computers and CommunicationsEscuela Politecnica University of Extremadura

Recently, building segmentation(BS) has drawn significant attention in remote sensing applications. Convolutional neural networks(CNNs) have become the mainstream analysis approach in this field owing to their powerful representative ability. However, owing to the variation in building appearance, designing an effective CNN architecture for BS still remains a challenging task. Most of CNN-based BS methods mainly focus on deep or wide network architectures, neglecting the correlation among intermediate *** address this problem, in this paper we propose a hybrid first and second order attention network(HFSA)that explores both the global mean and the inner-product among different channels to adaptively rescale intermediate features. As a result, the HFSA can not only make full use of first order feature statistics, but also incorporate the second order feature statistics, which leads to more representative feature. We conduct a series of comprehensive experiments on three widely used aerial building segmentation data sets and one satellite building segmentation data set. The experimental results show that our newly developed model achieves better segmentation performance over state-of-the-art models in terms of both quantitative and qualitative results.

关键词： building segmentation(BS) convolutional neural networks(CNNs) remote sensing high order pooling attention

Antecedent Precipitation Index to Estimate Soil Moisture and Correlate as a Triggering Process in the Occurrence of Landslides

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International Journal of Geosciences 2024年第1期15卷 70-86页

作者： Marcio Augusto Ernesto De Moraes Walter Manoel Mendes Filho Rodolfo Moreda Mendes Cassiano antonio Bortolozo Daniel Metodiev Marcio Roberto Magalhães De Andrade Harideva Marturano Egas Tatiana Sussel Gonçalves Mendes Luana Albertani Pampuch CEMADEN - National Centre for Monitoring and Early Warnings of Natural Disasters General Coordination of Research and Development S&#227o José dos Campos Brazil Faculty of Science and Technology Goias Federal University Aparecida de Goi&#226nia Brazil Institute of Science and Technology S&#227o Paulo State University (Unesp) S&#227o José dos Campos Brazil

Landslides are highly dangerous phenomena that occur in different parts of the world and pose significant threats to human populations. Intense rainfall events are the main triggering process for landslides in urbanized slope regions, especially those considered high-risk areas. Various other factors contribute to the process;thus, it is essential to analyze the causes of such incidents in all possible ways. Soil moisture plays a critical role in the Earth’s surface-atmosphere interaction systems;hence, measurements and their estimations are crucial for understanding all processes involved in the water balance, especially those related to landslides. Soil moisture can be estimated from in-situ measurements using different sensors and techniques, satellite remote sensing, hydrological modeling, and indicators to index moisture conditions. Antecedent soil moisture can significantly impact runoff for the same rainfall event in a watershed. The Antecedent Precipitation Index (API) or “retained rainfall,” along with the antecedent moisture condition from the Natural Resources Conservation Service, is generally applied to estimate runoff in watersheds where data is limited or unavailable. This work aims to explore API in estimating soil moisture and establish thresholds based on landslide occurrences. The estimated soil moisture will be compared and calibrated using measurements obtained through multisensor capacitance probes installed in a high-risk area located in the mountainous region of Campos do Jordão municipality, São Paulo, Brazil. The API used in the calculation has been modified, where the recession coefficient depends on air temperature variability as well as the climatological mean temperature, which can be considered as losses in the water balance due to evapotranspiration. Once the API is calibrated, it will be used to extrapolate to the entire watershed and consequently estimate soil moisture. By utilizing recorded mass movements and comparing them with AP

关键词： Landslides Antecedent Precipitation Index Soil Moisture Threshold Water Balance

The Essential Oil of Ocimum americanum from Senegal and Gambia as a Source of Methyleugenol for the Control of Bactrocera dorsalis, Fruit Fly

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Journal of Agricultural Chemistry and Environment 2024年第1期13卷 133-141页

作者： Yoro Tine antonio Alain Coffi Sinzogan Ousmane Ndiaye Cebastiana Sambou Alioune Diallo Ismaila Mbenga Kemo Badji El Hadji Omar Dieng Assa Balayara Jeanne Diatta Cheikhouna Gaye Julien Paolini Jean Costa Alassane Wele Saliou Ngom Laboratoire de Chimie Organique et Thérapeutique Faculté de Médecine Pharmacie et Odontologie Université Cheikh Anta Diop Dakar Sénégal Faculte des Sciences Agronomiques Universite d’Abomey Calavi Cotonou Benin Ecole Nationale Supérieure d’Agriculture (ENSA) Université Iba Der Thiam de Thiès Thiès Sénégal Direction de la Protection des Végétaux Rufisque Sénégal Laboratoire de Chimie des Produits Naturels Université de Corse Corte France National Agricultural Research Institute (NARI) Sere Kunda Gambia Institut Sénégalais de Recherches Agricoles (ISRA) Dakar Sénégal

The fruit fly, Bactrocera dorsalis (Diptera: Tephritidae) is one of the most important pests in all mango-producing areas, particularly in West Africa. In Senegal, O. americanum leaves have been used for several years to control this fly. However, to our knowledge, no chemical studies have been carried out. Thus, the aim of this study is to determine the chemical composition of the essential oil of O. americanum leaves collected in Senegal and Gambia. The essential oil obtained by hydrodistillation of these leaves is analyzed by GC/FID and GC/MS. Yields of essential oils from O. americanum leaves are 3.84% and 2.13%, respectively. Analysis of these essential oils by GC/FID and GC/MS allowed the identification of 23 compounds representing almost 100% of the total compositions. These essential oils are mainly dominated by methyleugenol (72.0% and 75.8%, respectively). Other components in significant percent are trans-β-caryophyllene (13.9% and 13.0%, respectively), germacrene D (4.1% and 3.7%, respectively), β-elemene (3.3% and 0.9%, respectively). Due to the high methyleugenol content, this study explains the attractive potential of O. americanum towards B. dorsalis. In perspective, we plan to evaluate the attractive effect of the essential oil and leaf powder of O. americanum against B. dorsalis, a real pest of mango orchards in Senegal.

关键词： Ocimum americanum Essential Oils Methyleugenol Bactrocera dorsalis GC/MS

Algorithms to Compute the Largest Invariant Set Contained in an Algebraic Set for Continuous-Time and Discrete-Time Nonlinear Systems

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 57-69页

作者： Laura Menini Corrado Possieri antonio Tornambè Dipartimento di Ingegneria Industriale Universitàdi Roma Tor VergataRoma 00133Italy Istituto di Analisi dei Sistemi ed Informatica“A.Ruberti ”Consiglio Nazionale delle Ricerche(IASI-CNR)Roma 00185Italy Dipartimento di Ingegneria Civile e Ingegneria Informatica Universitàdi Roma Tor VergataRoma 00133Italy

In this paper, some computational tools are proposed to determine the largest invariant set, with respect to either a continuous-time or a discrete-time system, that is contained in an algebraic set. In particular, it is shown that if the vector field governing the dynamics of the system is polynomial and the considered analytic set is a variety, then algorithms from algebraic geometry can be used to solve the considered problem. Examples of applications of the method(spanning from the characterization of the stability to the computation of the zero dynamics) are given all throughout the paper.

关键词： Asymptotic stability discrete-time systems invariance nonlinear systems

How to deal with right hepatic artery coming from the superior mesenteric artery during minimally invasive pancreaticoduodenectomy: A systematic review

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Hepatobiliary & Pancreatic Diseases International 2023年第2期22卷 121-127页

作者： Andrea Chierici antonio Castaldi Mohamed El Zibawi Edoardo Rosso antonio Iannelli Service de Chirurgie Digestive Centre Hospitalier d’Antibes Juan-les-PinsAntibesFrance Department of Digestive Surgery and Liver Transplantation University Hospital Center of NiceNiceFrance Department of Radiology University Hospital Center of NiceNiceFrance Department of Surgery Centre Hospitalier de LuxembourgLuxembourgLuxembourg Faculty of Medicine UniversitéCôte d’AzurNiceFrance Inserm U1065Team 8’Hepatic Complications of Obesity and Alcohol’NiceFrance

Background: Anatomical variations in the liver arterial supply are quite common and can affect the surgical strategy when performing a minimally invasive pancreaticoduodenectomy(MIPD). Their presence must be preemptively detected to avoid postoperative liver and biliary complications. Data sources: Following the PRISMA guidelines and the Cochrane protocol we conducted a systematic review on the management of an accessory or replaced right hepatic artery(RHA) arising from the superior mesenteric artery when performing an MIPD. Results: Five studies involving 118 patients were included. The most common reported management of the aberrant RHA was conservative(97.0%);however, patients undergoing aberrant RHA division without reconstruction did not develop liver or biliary complications. No differences in postoperative morbidity or long-term oncological related overall survival were reported in all the included studies when comparing MIPD in patients with standard anatomy to those with aberrant RHA. Conclusions: MIPD in patients with aberrant RHA is feasible without increase in morbidity and mortality. As preoperative strategy is crucial, we suggested planning an MIPD with an anomalous RHA focusing on preoperative vascular aberrancy assessment and different strategies to reduce the risk of liver ischemia.

关键词： Pancreatic cancer Pancreaticoduodenectomy Hepatic artery Superior mesenteric artery

Infrastructure for collaborative science and societal applications in the Columbia River estuary

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Frontiers of Earth Science 2015年第4期9卷 659-682页

作者： antonio M. BAPTISTA NSF Science and Technology Center for Coastal Margin Observation & Prediction Oregon Health & Science University Portland Oregon 97239 USA Oregon Health & Science University Astoria Oregon 97103 USA Portland State University Portland Oregon 97201 USA Applied Physics Laboratory of the University of Washington Seattle Washington 98105 USA Oregon State University Corvallis Oregon 97331 USA Formerly University of Maryland Center for Environmental Studies Maryland 21613 USA

To meet societal needs, modem estuarine science needs to be interdisciplinary and collaborative, combine discovery with hypotheses testing, and be responsive to issues facing both regional and global stakeholders. Such an approach is best conducted with the benefit of data-rich environments, where information from sensors and models is openly accessible within convenient timeframes. Here, we introduce the operational infrastruc- ture of one such data-rich environment, a collaboratory created to support （a） interdisciplinary research in the Columbia River estuary by the multi-institutional team of investigators of the Science and Technology Center for Coastal Margin Observation ＆ Prediction and （b） the integration of scientific knowledge into regional decision making. Core components of the operational infrastructure are an observation network, a modeling system and a cyber-infrastructure, each of which is described. The observation network is anchored on an extensive array of long-term stations, many of them interdisciplinary, and is complemented by on-demand deployment of temporary stations and mobile platforms, often in coordinated field campaigns. The modeling system is based on finite- element unstructured-grid codes and includes operational and process-oriented simulations of circulation, sediments and ecosystem processes. The flow of information is managed through a dedicated cyber-infrastructure, con- versant with regional and national observing systems.

关键词： estuaries observations numerical modeling,cyber-infrastructure Columbia River