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Frontiers of Engineering Management 2020年第1期7卷 131-141页

作者： Berardo NATICCHIA Alessandra CORNELI alessandro carbonari Department of Civil and Building Engineering and Architecture(DICEA) Polytechnic University of MarcheAncona 60131Italy

The quality of information flow management has a remarkable effect on the entire life cycle of *** retrieval of technical specifications and features of building components and their performance assessment leads to increased cost and time and efficiency reduction,especially during the facility management(FM)*** introduction of building information modeling(BIM)in the construction industry can provide a valuable means of improving the organization and exchange of *** tools integrate multiple levels of information within a single digital model of a ***,the support given by BIM to FM is far from being fully *** can benefit from real-time communication with the data repository whenever the need for gathering contextual information and/or updating any data in the digital model *** framework proposed in this study aims to develop a system that supports on-site *** requirements have been determined from the analyses of procedures that are usually implemented in the building life *** studies set the standard for the development of a digital model of a building,which will be shared among various actors in charge of FM and accessed via a cloud ***,mixed reality is proposed to support specific information that is relevant to geometric features and procedures to be followed by *** article presents three use-cases supported by the proposed *** addition,this research article describes the first proof of concept regarding real-time support for FM.

关键词： information flow management BIM mixed reality common data environment facility management

Development of an Expert Model to Assess Falls from Height Hazards in Construction Sites

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Journal of Civil Engineering and Architecture 2014年第5期8卷 517-528页

作者： Carlo Argiolas alessandro carbonari Emanuela Quaquero Dipartimento di Ingegneria Civile Ambiente e Architettura (DICAAR) Universitb di Cagliari Cagliari 09134 Italy Dipartimento di Ingegneria Civile Edile e Architettura (DICEA) Universita Politecnica delle Marche Ancona 6013 l Italy

This paper reports on the current state of an ongoing research project which is aimed at implementing intelligent models for hardly predictable hazard scenarios identification in construction sites. As any programmatic actions cannot deal with the unpredictable nature of many risk dynamics, an attempt to improve the current approach for safety management in the construction industry will be presented in this paper. To this aim, the features offered by Bayesian networks have been exploited. The present research has led to the definition of a probabilistic model using elicitation techniques from subjective knowledge. This model, which might be meant as a reliable knowledge map about accident dynamics, showed that a relevant part of occurrences fall in the ＂hardly predictable hazards＂ category, which cannot be warded off by programmatic safety measures. Hence, more effort turned out to be needed in order to manage those hardly predictable hazardous scenarios. Consequently, further developments of this research project will focus on a real time monitoring system for the identification of unpredictable hazardous events in construction.

关键词： Health and safety management risk assessment Bayesian networks job sites.

Development of a BIM-based holonic system for real-time monitoring of building operational efficiency

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Frontiers of Engineering Management 2020年第1期7卷 89-103页

作者： alessandro carbonari Leonardo MESSI Berardo NATICCHIA Massimo VACCARINI Massimiliano PIRANI Department of Civil and Building Engineering and Architecture(DICEA) Polytechnic University of Marchevia Brecce Bianche n.12AnconaItaly Department of Information Engineering(DII) Polytechnic University of Marchevia Brecce Bianche n.12AnconaItaly

In the wide context of facility management,several processes,such as operations,maintenance,retrofitting,and renovations,ensure that buildings comply with the principles of efficiency,cost-effectiveness,and indoor *** from ordinary operation,facility management is responsible for the renovation of and long-term performance improvement of building *** such a scenario,the cyber–physical system(CPS)paradigm with holonic architecture,which is the focus of this study,can successfully guide the operation management and long-term refurbishment processes of *** to the manufacturing field,the developed CPS maximizes holons’self-configuration and self-organization and overall throughput effectiveness metrics to detect the best corrective actions toward system ***,suggestions and lessons learned from the evaluation of building efficiency are redirected to the building information ***,the digital model acts as a repository of currently available equipment for operations management and the history of diagnoses that support decision-making during the maintenance,retrofitting,and renovation ***,the repeated detection of a specific issue,which is unaffected by operations management,should be considered an opportunity to act and enhance the performances of existing building *** to a goods-producing industry,the building management system developed in this study applies the aforementioned methodology to provide services related to indoor comfort and building *** approach indicates that a method for automatic real-time diagnosis is tested in a case study consisting of a multi-use and large public *** current paper,which is an extended version of the one presented in the Creative Construction Conference 2018,deepens the decision support tool and the supervision ***,the developed system is contextualized by providing an example of use case and highlighting the st

关键词： BIM building management system cyber-physical system facility management holonic system

A novel solution treatment and aging for powder bed fusion-laser beam Ti-6Al-2Sn-4Zr-6Mo alloy:Microstructural and mechanical characterization

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 414-424页

作者： Gianluca Pirro Alessandra Martucci alessandro Morri Mariangela Lombardi Lorella Ceschini Department of Industrial Engineering(DIN) Alma Mater Studiorum-University of BolognaBologna 40136Italy Department of Applied Science and Technology(DISAT) Politecnico di TorinoTorino TO 10129Italy

Ti-6Al-4Zr-2Sn-6Mo alloy is one of the most recent titanium alloys processed using powder bed fusion-laser beam(PBF-LB)*** alloy has the potential to replace Ti-6Al-4V in automotive and aerospace applications,given its superior mechanical properties,which are approximately 10%higher in terms of ultimate tensile strength(UTS)and yield strength after appropriate heat *** as-built conditions,the alloy is characterized by the presence of soft orthorhombicα″martensite,necessitating a postprocessing heat treatment to decompose this phase and enhance the mechanical properties of the ***,PBFed Ti6246 components undergo an annealing process that transforms theα″martensite into anα-βlamellar *** primary objective of this research was to develop a solution treatment and aging(STA)heat treatment tailored to the unique microstructure produced by the additive manufacturing process to achieve an ultrafine bilamellar microstructure reinforced by precipitation *** study investigated the effects of various solution temperatures in theα-βfield(ranging from 800 to 875℃),cooling media(air and water),and aging time to determine the optimal heat treatment parameters for achieving the desired bilamellar *** each heat treatment condition,differentα-βmicrostructures were found,varying in terms of theα/βratio and the size of the primaryα-phase *** attention was given to how these factors were influenced by increases in solution temperature and how microhardness correlated with the percentage of the metastableβphase present after *** tests were performed on samples subjected to the most promising heat treatment parameters.A comparison with literature data revealed that the optimized STA treatment enhanced hardness and UTS by13%and 23%,respectively,compared with those of the annealed *** surface analyses were conducted to investigate fracture mechanisms.

关键词： powder bed fusion-laser beam titanium alloys heat treatments mechanical properties fractographic analysis

Coulomb Friction Driving Brownian Motors

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Communications in Theoretical Physics 2014年第10期61卷 505-513页

作者： alessandro Manacorda Andrea Puglisi alessandro Sarracino Dipartimento di Fisica Università "Sapienza"p.le A.Moro 200185 RomeItaly Istituto dei Sistemi Complessi - CNR and Dipartimento di Fisica Università "Sapienza"p.le A.Moro 200185 RomeItaly Kavli Institute for Theoretical Physics China the Chinese Academy of Sciences Laboratoire de Physique Théorique de la Matière Condensée CNRS UMR 7600case courrier 121Université Paris 64Place Jussieu75255 Paris CedexFrance

We review a family of models recently introduced to describe Brownian motors under the influence of Coulomb friction, or more general non-linear friction laws. It is known that, if the heat bath is modeled as the usual Langevin equation(linear viscosity plus white noise), additional non-linear friction forces are not sufficient to break detailed balance, i.e. cannot produce a motor effect. We discuss two possibile mechanisms to elude this problem. A first possibility, exploited in several models inspired to recent experiments, is to replace the heat bath's white noise by a "collisional noise", that is the effect of random collisions with an external equilibrium gas of particles. A second possibility is enlarging the phase space, e.g. by adding an external potential which couples velocity to position, as in a Klein–Kramers equation. In both cases, non-linear friction becomes sufficient to achieve a non-equilibrium steady state and, in the presence of an even small spatial asymmetry, a motor effect is produced.

关键词： Brownian motors ratchet effect Coulomb friction

A flexible multi-body model of a surface miner for analyzing the interaction between rock-cutting forces and chassis vibrations

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International Journal of Mining Science and Technology 2021年第3期31卷 365-375页

作者： alessandro Medolago Stefano Melzi Tesmec S.p.A. Grassobbio 24050Italy Department of Mechanics Politecnico di MilanoMilano 20156Italy

The discontinuous nature of rock cutting can easily cause unwanted vibrations in the structure of a surface *** these vibrations are not properly addressed,the related stress cycles can gradually damage the chassis resulting in fatigue *** events can seriously undermine the safety of operators and digging operations may be stopped for days,with an obvious economic *** work presents an analysis of the dynamics of a surface miner,focusing on the interaction between cutting machine dynamics and cutting forces,which is a new approach for this type of *** this purpose,the authors developed a numerical model of the cutting process made up of(1)a multi-body model of the cutting machine,which takes into account the chassis's flexibility;(2)a model of the rotating cutting head;and(3)a model of the interaction between the cutting head and rock,based on Shao's *** model was compared with experimental results and then used to investigate the effects of cutting speed and cutting depth on the machine dynamics.

关键词： Surface miner Flexible multi-body model Validation Cutting forces Chassis vibrations

Spin-phonon decoherence in solid-state paramagnetic defects from first principles

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npj Computational Materials 2023年第1期9卷 1129-1136页

作者： Sourav Mondal alessandro Lunghi School of Physics AMBER and CRANN InstituteTrinity CollegeDublin 2Ireland

Paramagnetic defects in diamond and hexagonal boron nitride possess a combination of spin and optical properties that make them prototypical solid-state *** the coherence of these spin qubits being critically limited by spin-phonon relaxation,a full understanding of this process is not yet *** we apply ab initio spin dynamics simulations to this problem and quantitatively reproduce the experimental temperature dependence of spin relaxation time and spin coherence *** demonstrate that low-frequency two-phonon modulations of the zero-field splitting are responsible for spin relaxation and decoherence,and point to the nature of vibrations in 2-dimensional materials as the culprit for their shorter coherence *** results provide an interpretation to spin-phonon decoherence in solid-state paramagnetic defects,offer a strategy to correctly interpret experimental results,and pave the way for the accelerated design of spin qubits.

关键词： phonon relaxation state

Matrix Algebras in Non-Hermitian Quantum Mechanics

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Communications in Theoretical Physics 2011年第7期56卷 96-98页

作者： alessandro Sergi School of Physics University of KwaZulu-NatalPietermaritzburg CampusPrivate Bag X01 Scottsville

In principle, non-Hermitian quantum equations of motion can be formulated using as a starting point either the Heisenberg＇s or the Schroedinger＇s picture of quantum dynamics. Here it is shown in both cases how to map the algebra of commutators, defining the time evolution in terms of a non-Hermitian Hamiltonian, onto a non-Hamiltonian algebra with a Hermitian Hamiltonian. The logic behind such a derivation is reversible, so that any Hermitian Hamiltonian can be used in the formulation of non-Hermitian dynamics through a suitable algebra of generalized （non-Hamiltonian） commutators. These results provide a general structure （a template） for non-Hermitian equations of motion to be used in the computer simulation of open quantum systems dynamics.

关键词： non-hermitian quantum mechanics non-Hamiltonian dynamics open quantum systems

Recent Advances in the Catalytic Functionalization of “Electrophilic” Indoles

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Chinese Journal of Chemistry 2020年第3期38卷 287-294页

作者： alessandro Cerveri Marco Bandini Dipartimento di Chimica"Giacomo Ciamician"-Alma Moter Studiorum Universita di Bologna Via Selmi 240126 BolognaItaly Consorzio C.I.N.M.P.I.S.Via Selmi 2 40126 BolognaItaly

When "dark"is bright:the scarcely explored electrophilic profile of the indolyl core(dark side)continues to inspire developments in organic synthesis by means of new catalytic *** advancements in the field enabled mol... 详细信息

关键词： chemistry. Catalytic heterocyclic

Cysteine carboxyethylation:a novel post-translational modification associated with autoimmune arthritis

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Signal Transduction and Targeted Therapy 2023年第8期8卷 3561-3562页

作者： alessandro Didonna Department of Anatomy and Cell Biology Brody School of MedicineEast Carolina UniversityGreenvilleNC 27834USA

In a study recently published in Science,Zhai et *** that protein carboxyethylation results in the formation of neoantigens with the ability to trigger autoimmune arthritis in the context of ankylosing spondylitis(AS)pathology.1 This work defines a novel molecular mechanism underlying immune tolerance breakdown,which could serve as a target for innovative therapeutic strategies against AS and other autoimmune disorders.

关键词： autoimmune pathology