800 research outputs found
Interpretazione geoarcheologica di un contesto di scavo di etĂ romana presso Cervia (Ravenna)
Lo studio riguarda l’analisi stratigrafica tridimensionale di un contesto di scavo presso la località Pinarella di Cervia (Ravenna).
Il lavoro è consistito nella realizzazione di cinque colonne stratigrafiche e relative osservazioni utili alla correlazione di queste, dalle quali è stato possibile ricostruire l’evoluzione dell’assetto ambientale nell’arco temporale compreso tra l’età romana (20 a.C-20 d.C.) ed il Medioevo.
Il contesto stratigrafico rilevato mostra una chiara evidenza trasgressiva da etĂ romana su ambienti continentali preromani. In un ambito areale limitato si sono osservate facies costiere giacenti su depositi fini lagunari e palustri.
Il rinvenimento di alcune strutture archeologiche romane, di ancora non certa destinazione funzionale, ha permesso di formulare considerazioni sulla quota del livello del mare in etĂ romana, riconosciuta a 2,60/2,70m al di sotto del livello marino attuale.
Si è notato come la regressione forzata caratteristica dell’ambiente padano, in questo ambito sia molto limitata e tarda (successiva al VII sec. d.C) e sia avvenuta ad opera dell’accrezione dell’apparato deltizio del Savio nella sua ala destra
Numerical simulation of the extrusion and layer deposition processes in 3D concrete printing with the Particle Finite Element Method
3D Concrete Printing (3DCP) is a rapidly evolving technology that allows for the efficient and accurate construction of complex concrete objects. In this paper, a numerical modelling approach is presented for the simulation of the printing process of cementitious materials, based on the homogeneous fluid assumption. To cope with the large deformations of the domain and the nonlinearity resulting from the use of a non-Newtonian rheological law, the Navier–Stokes equations are solved in the framework of the Particle Finite Element Method (PFEM). Furthermore, tailored solutions have been formulated and implemented for the time-dependent moving boundary conditions at the nozzle outlet and for the efficient handling of the inter-layer contact in the same PFEM framework. The overall computational cost is decreased by the implementation of an adaptive de-refinement technique, which drastically reduces the number of degrees of freedom in time. The proposed modelling approach is finally validated by simulating the printing process of six rectilinear layers and one multi-layer “wall”. The results show good agreement with the experimental data and provide valuable insights into the printing process, paving the way for the use of numerical modelling tools for the optimization of materials and processes in the field of 3D Concrete Printing
Rubber particle cavitation in toughened Poly(methyl methacrylate)
Theoretical and experimental investigations were performed on multiphase polymers;
especially rubber toughened (RT) poly(methyl methacrylate) (PMMA) to explore
cavitation in the rubbery phase.
The main objectives of this project:
i. To identify experimental methods to effectively detect rubber particle cavitation.
ii. To relate intrinsic toughness with rubber properties (e.g. rubber type, particle
morphology, rubber content, particle size).
iii. To study the relationships between different pre-treatments, and control the onset of
cavitation.
Thermal contraction measurements, dynamic mechanical analysis, creep and fracture
tests were the techniques adopted. Results from those different methods were examined,
compared, and related to a specifically devised mathematical model. They were found
consistent.
Thermal contraction measurement presents valuable information about the progress of
cavitation after pre-strain. It shows extensive rubber cavitation at low longitudinal strain
(about 2 - 3%), which is sufficient to produce permanent damage, not recoverable by
annealing.
Dynamic mechanical procedure estimates the resistance of the soft phase to cavitation in
response to mechanically and thermally generated stresses. It can be used to detect
distributions of stress and strain within the soft phase after cavitation. The dynamic
mechanical tests, supported by electron microscopy, provide further insight into the
cavitation mechanism. It is suggested that a complete failure of the rubber will allow
any internal stresses to relax, and the rubber glass transition temperature (Tg) to become
independent of the tensile stress on the specimen. If the particles remain intact, the loss
peak will shift to lower temperature with increasing triaxial tension as the rubber free
volume increases in response to a growing dilatational volume strain. To any inbetween state, regarding rubber phase partial failure, will correspond a loss peak in the
temperature range defined by Tg of the stretched rubber and the one of the relaxed
rubber (upper limit).
A major advantage is that thermal contraction measurements and dynamic mechanical
tests provide an observation method for the onset of cavitation as a separate process,
without the complications that arise when shear yielding or multiple crazing occur at the
same time.
Analysis based on the energy-balance model suggested multiple cavitation as a possible
mechanism for complex particle morphology (e.g. salami or hard-soft-hard core-shell).
These results are consistent with experimental data.Ph
Turismo e preços
Analysis of price determination aspects in touristic centers and its possible contribution to the inflationary process regarding: touristic activities comsumption versus total economy consumption; cost of living differentiations in touristic centers as a result of stiffness in supply regardinggeographic instability of its product; distributive implications of the costs and benefits of monopolistic power of touristic resorts; searching of efficiency of allocation of resources through local activities expansion of touristic groundwork, in response to the seasonal stirring of demand.Análise de aspectos da formação dos preços nos centros turĂsticos e sua possĂvel contribuição ao processo inflacionário, abordando: consumo das atividades turĂsticas em relação ao consumo total da economia; variações nos custos de vida nos centros turĂsticos em função da rigidez da oferta, no que tange Ă mobilidade geográfica de seu produto: implicações distributivas dos benefĂcios e custos do poder de monopĂłlio dos conjuntos turĂsticos; busca da eficiĂŞncia alocativa de recursos pela expansĂŁo das atividades locais de infra-estrutura turĂstica, em resposta aos movimentos sazonais de demanda
John Dickinson: The Development and Deployment of a Legal Mind: 1754-1774
This thesis argues that John Dickinson’s political thought is best described as legal-minded. I define Dickinson as broadly “legal-minded,” with his use of statute-based arguments conveyed with oratorical skill, and his articulation of constitutional principles of natural rights and balanced government. Dickinson’s work during the period from 1764 to 1774 was concerned with deploying measured arguments and constitutional principles to convince American colonists to preserve their rights against encroachments from Great Britain. Using the letters he wrote to his parents while studying law at the Middle Temple in London in the 1750s, and various public writing and speeches from the period between 1764 and 1774, this thesis demonstrates that the robust intellectual thought that drove Dickinson’s complicated politics emanated from his understanding of British law. The epilogue briefly explores the period from 1776 to 1803, when he drafted the Articles of Confederation, an alternate Pennsylvania constitution, and argued in support of the U.S. Constitution
Uma análise da recepção constitucional e da legitimidade da opção do legislador em tornar lĂcito o aborto decorrente do estupro, em face do direito Ă vida do feto e da dignidade da pessoa humana da genitora
Trabalho de ConclusĂŁo do Curso, apresentado para obtenção do grau de bacharel no Curso de Direito da Universidade do Extremo Sul Catarinense, UNESC.O presente trabalho tem como objetivo principal analisar a opção do legislador de tornar lĂcito o aborto decorrente de estupro diante do confronto entre os princĂpios constitucionais do direito Ă vida (do feto) e o direito a dignidade da pessoa humana (da mulher) nos casos de gravidez decorrente de violĂŞncia sexual que tenha por conseqĂĽĂŞncia a prática do aborto legal. Para o alcance deste objetivo, foi utilizada a metodologia da pesquisa bibliográfica, atravĂ©s de mĂ©todo dedutivo entre artigos cientĂficos, livros, doutrinas e legislação. No primeiro capitulo foram abordados o conceito, as caracterĂsticas e a classificação dos princĂpios constitucionais, bem como a colisĂŁo principiolĂłgica e a tĂ©cnica utilizada para resolução dessas colisões. No segundo capitulo foram analisados os direitos fundamentais, abordando seu conceito, caracterĂsticas, funções, classificação, e os direitos fundamentais a vida, a dignidade da pessoa humana e o direito a liberdade e entre este o direito a liberdade sexual da mulher diante do planejamento familiar e seus direitos reprodutivos. No terceiro capitulo foi estudado o aborto, sua fundamentação legal, seu conceito, as espĂ©cies de aborto com ĂŞnfase no aborto decorrente de estupro, bem como a liberdade das mulheres a prática do aborto se a gravidez estiver sido decorrente de estupro. E por Ăşltimo foi realizado uma análise da opção do legislador de tornar lĂcito o aborto decorrente de estupro, estudando os direitos fundamentais em conflito e utilizando o princĂpio da proporcionalidade para resolução desta colisĂŁo, concluindo-se pela recepção da opção constitucional
Diagnosi infermieristiche e pianificazione dell’assistenza domiciliare nell’ASL di Brescia
Il presente articolo illustra i risultati di un progetto di formazione e ricerca realizzato a partire dal mese di ottobre 2007 presso l’ASL di Brescia. Tale progetto, rivolto a un gruppo di circa 90 infermieri operanti nell’ambito dell’assistenza domiciliare, perseguiva un duplice obiettivo: consolidare negli infermieri partecipanti la competenza metodologica relativa alla formulazione delle diagnosi infermieristiche, alla pianificazione e alla documentazione dell’assistenza infermieristica e indagare, attraverso il metodo attivo della consensus conference applicato a tali contenuti, le caratteristiche fondamentali del nursing in ambito domiciliare.
Il progetto si è concretizzato in un corso di aggiornamento, durante il quale gli infermieri partecipanti hanno potuto esprimere la propria valutazione in merito alla natura dei problemi di salute prevalentemente
incontrati durante la presa in carico domiciliare, alla loro possibile codifica attraverso il linguaggio proposto dalla classificazione delle diagnosi infermieristiche della North American Nursing Diagnosis Association International (NANDA International), al grado di autonomia nell’identificazione e nel trattamento di tali diagnosi, alla tipologia degli interventi assistenziali prevalentemente pianificati e attuati, alla qualità della documentazione attualmente in uso. L’analisi dei dati raccolti configura il profilo di un infermiere domiciliare con competenza avanzata, chiamato ad affrontare problemi socio-sanitari complessi e che richiedono un approccio integrato e multidisciplinare. Nel contesto territoriale della provincia bresciana, secondo gli infermieri
partecipanti, il grado di autonomia nell’identificazione delle diagnosi infermieristiche e l’impegno nella pianificazione degli interventi permangono maggiormente orientati verso gli ambiti che riguardano la
sfera bio-fisiologica (modello di eliminazione, di alimentazione, cura del sé ecc.). Tuttavia, l’infermiere che fornisce assistenza in ambito domiciliare si confronta sempre più spesso con problematiche emergenti, come la gestione dell’aderenza al regime terapeutico, il supporto comunicativo e relazionale, lo stimolo motivazionale
alla gestione del coping e la supervisione del ruolo del caregiver. Infine, il progetto di formazione e ricerca ha stimolato la riflessione sulla necessitĂ di migliorare la struttura e le modalitĂ di gestione della documentazione infermieristica domiciliare
Ethical challenges with the left ventricular assist device as a destination therapy
The left ventricular assist device was originally designed to be surgically implanted as a bridge to transplantation for patients with chronic end-stage heart failure. On the basis of the REMATCH trial, the US Food and Drug Administration and the US Centers for Medicare & Medicaid Services approved permanent implantation of the left ventricular assist device as a destination therapy in Medicare beneficiaries who are not candidates for heart transplantation. The use of the left ventricular assist device as a destination therapy raises certain ethical challenges. Left ventricular assist devices can prolong the survival of average recipients compared with optimal medical management of chronic end-stage heart failure. However, the overall quality of life can be adversely affected in some recipients because of serious infections, neurologic complications, and device malfunction. Left ventricular assist devices alter end-of-life trajectories. The caregivers of recipients may experience significant burden (e.g., poor physical health, depression, anxiety, and posttraumatic stress disorder) from destination therapy with left ventricular assist devices. There are also social and financial ramifications for recipients and their families. We advocate early utilization of a palliative care approach and outline prerequisite conditions so that consenting for the use of a left ventricular assist device as a destination therapy is a well informed process. These conditions include: (1) direct participation of a multidisciplinary care team, including palliative care specialists, (2) a concise plan of care for anticipated device-related complications, (3) careful surveillance and counseling for caregiver burden, (4) advance-care planning for anticipated end-of-life trajectories and timing of device deactivation, and (5) a plan to address the long-term financial burden on patients, families, and caregivers
Funcionalidade da rede de cidades mundiais a nĂvel internacional
O trabalho analisa a funcionalidade da rede urbana a nĂvel internacional, trabalhando com a ideia de "cidade mundial". AIĂ©m de uma discussĂŁo a respeito da idĂ©ia de "cidade mundial" a análise Ă© conduzida atravĂ©s da elaboração de um modelo econĂ´mico que testa o grau de articulação do sistema urbano a nĂvel internacional, usando como variáveis explicativas o comĂ©rcio de manufaturas e o grau relativo de urbanização dos 25 paĂses componentes da amostra. This paper analyses the functionality of the urban system at the international level, dealing with the idea of "world city". Besides the discussion about the concept of "world city", the analyses goes through the elaboration of an econometric model that examines the urban network articulation degree at the international level using as independent veriables the trade of manufactures and the relative level of urbanization of the 25 countries which are part of the sample
Radiation-Induced Errors in the Software Level of Real-Time Soft Processing System
FPGAs' and programmable hardware's high performance and flexibility have made them a reasonable choice for space-oriented applications, although susceptible to soft errors. This paper proposes a comprehensive analysis of the effects of microarchitectural faults on soft processors due to radiations, identifying the hardware sources of errors and how they propagate to software-level
- …