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- 저자 : Augusto, C R (검색결과 169 건)
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Paulo A. Augusto,Teresa Castelo-Grande,Pedro Augusto,Domingos Barbosa,A.M. Est?vez 한국물리학회 2007 Current Applied Physics Vol.7 No.3
A new device, MAGCLATMoped by the authors. In a previous article the equations of movement for non-magnetic particles in this new device were analyzed and inthis paper the limiting conditions set by the dierent variables and equations of movement are presented for the case of the non-magneticparticles. The knowledge of these limiting conditions is important as they set the boundaries within which we may manipulate theMAGCLATM’s operating and design variables.
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Paulo A. Augusto,Teresa Castelo-Grande,Pedro Augusto,A.M. Est?vez,Domingos Barbosa 한국물리학회 2007 Current Applied Physics Vol.7 No.3
The theoretical principles of MAGCLATMsusceptibility, are presented for the magnetic particles. An empirical coecient (TCG2) is introduced in the equations of movement toaccount for deviations between experimental and theoretical values.
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Augusto Cannone Falchetto,문기훈 한국도로학회 2015 한국도로학회논문집 Vol.17 No.1
PURPOSES: This paper, presents the results of a laboratory study aimed to verify the suitability of a particular type of Electric Arc Furnace (EAF) steel slag to be recycled in the lithic skeleton of both dense graded and porous asphalt mixtures for flexible pavements. METHODS : Cyclic creep and stiffness modulus tests were performed to evaluate the mechanical performance of three different asphalt mixtures (dense graded, porous asphalt, and stone mastic) prepared with two types of EAF steel slag. For comparison purposes, the same three mixtures were also designed with conventional aggregates (basalt and limestone). RESULTS : All the asphalt mixtures prepared with EAF steel slag satisfied the current requirements of the European standards, which support EAF steel slag as a suitable material for flexible pavement construction. CONCLUSIONS : Based on the experimental work, the use of waste material obtained from steel production (e.g. EAF steel slag) as an alternative in the lithic skeleton of asphalt mixtures can be a satisfactory and reasonable choice that fulfills the “Zero Waste”objective that many iron and steel industries have pursued in the past decades.
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Augusto Cannone Falchetto,문기훈,조상갑 한국아스팔트학회 2022 한국아스팔트학회지 Vol.12 No.1
It is well known that application of alternative aggregate material in asphalt pavement area is crucial not for saving construction budget but for mitigating environmental pollution. Several research efforts: for finding alternative aggregate material, were performed in U.S. during the past decades. One of the research achievements is application of taconite aggregate: a byproduct of taconite mining industries in northern Minnesota, U.S., in asphalt pavement construction. Some studies performed performance evaluation of taconite aggregate added mixture with various mechanical testing procedure. However, not many studies considered pavement design performance simulation, evaluation and comparison in case of taconite aggregate application. In this paper, performance evaluation of taconite aggregate mixture by means of composite pavement design simulation using AASHTOWare-Pavement (MEPDG: Mechanical-Empirical Pavement Design Guide) was considered. Reasonable and comparable pavement performance was found when taconite aggregate is applied compared to the conventional asphalt mixture.
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Reuse of Electric Arc Furnace Steel Slags in Asphalt Pavement Mixtures
Augusto Cannone Falchetto,Ki Hoon Moon 한국도로학회 2014 한국도로학회 학술발표회 논문집 Vol.2014 No.9
The potential of marginal materials as components of road infrastructures has been studied for many years. The list of materials includes non-traditional natural materials (rocks and soils), industrial by-products (from metallurgical industry, thermal electric power stations, and chemical industry) and wastes (mining and quarrying, municipal, industrial and demolition wastes). Among these materials, Electric Arc Furnace Steel Slags (EAFSS) presents physical-mechanical characteristics and full chemical compatibility with the hydrocarbon binders used in road construction and, therefore, have high potential for being re-used. This paper presents the results of a laboratory study conducted to verify the suitability of a particular type of Electric Arc Furnace Steel Slag (EAFSS) to be recycled in the aggregate skeleton of dense graded and porous asphalt mixtures for pavements application. One dense graded mixture for wearin gcourse(WCAC), one Stone Mastic Asphalt(SMA) and one Porous Asphalt(PA) were prepared and compacted for this purpose. The computed results of Marshall Stability, Flow and Indirect Tensile Strength (ITS) values are presented in Table 1.
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Design Optimization of Tapered Steel Wind Turbine Towers by QPSO Algorithm
Augusto Furlanetto,Herbert Martins Gomes,Felipe Schaedler de Almeida 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.5
Wind energy has become one of the most widely used alternative energy sources in recent years due to its clean and renewable character. In the context of increasing demand for new facilities, the cost of a wind turbine is a key factor for the success of new wind farms. The reduction of the amount of material used to build the wind turbine tower is one way to reduce the project cost. This work presents a methodology for the minimization of the weight of the tubular steel towers of wind turbines using a metaheuristic optimization algorithm. The diameters of the cross-section at the base and the top of the conical tower are considered as continuous design variables. Due to constructional aspects, the tower is manufactured in many segments, which wall thicknesses are taken as discrete design variables. Besides the dead load, the design considers the action of wind load, which is taken as an equivalent static force determined using the Brazilian standard NBR6123. The design constraints considered in this work are the maximum admissible displacements at the top of the tower under service condition, the tower’s lowest natural frequency and the safety criteria for steel structures defi ned by the Brazilian standard NBR8800. The mixed-integer nonlinear optimization problem formulated for the structural design in this work is solved using the quantum particle swarm optimization algorithm (QPSO). On average, the QPSO solution was 12% lighter than designs based on other well-established algorithms in a comparative study. Nonetheless, no signifi cant improvement was observed concerning the standard particle swarm optimization.
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Augusto Cannone Falchetto,KiHoon Moon 한국도로학회 2015 한국도로학회 학술발표회 논문집 Vol.2015 No.10
Analyzing asphalt mixture images can provide crucial information not only for generating advanced geometry structure in several numerical computations (i.e. FEM and/or DEM) codes, but also for numerically evaluating the material microstructure. It is well known that 3D X-Ray Computer Tomography (CT) can provide accurate and realistic microstructure information of asphalt mixtures; however, this technology still presents two limitations: 1) the equipment is very expensive and, therefore, only few pavement agencies can afford it, and 2) the software required to generate realistic image of asphalt mixture with three-phase structure (aggregate, asphalt binder and air-voids) is based on a global thresholding algorithm which cannot be easily accessed and edited by users and practitioners. In this paper, accurate and realistic 2D three-phase asphalt mixture images were generated using an advanced DIP analysis code (implemented on MATLABTM) and a common flatbed scanner, which can be easily purchased at relatively low price. The threshold algorithm was developed based on the computed results of Gmm (maximum specific gravity), Gmb (bulk specific gravity), VMA (voids in mineral aggregates) of given asphalt mixtures which can be experimentally obtained in a laboratory environment. 2D three-phase images of asphalt mixtures were derived from grey scale images (color intensity from 0 to 255) obtained from original RGB (Red-Green-Blue) scale images with a dual-threshold computation techniques (i.e. one step for computing air voids phase, T1, and a second step for computing asphalt binder (and/or mastic) phase, T2). An example of DIP analysis results is shown in Figure 1. Based on the computation results, quite accurate and good visual agreement was observed between RGB scale image and DIP analyzed image. The findings indicate that this advanced DIP analysis technique can provide reliable geometry and microstructural information for several numerical simulations such as finite element method (FEM) and discrete element modeling (DEM). This research work represents a solid base for performing simple 2D microstructure analysis using 2- and 3-point correlation function and for developing the Moon Cannone Falchetto (MCF) model which will be introduced in the next annual KSRE conference.
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Antibacterial Screening of Anthocyanic and Proanthocyanic Fractions from Cranberry Juice
Augusto Cesar C. Spadaro,Denise P.S. Leit?,Ana Cristina M. Polizello,Izabel Y. Ito 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.1
The effect of anthocyanin- and proanthocyanidin-rich fractions isolated from cranberry juice was studied fortheir antibacterial activity against nine bacterial strains. Activity was assessed by the agar diffusion assay. Staphylococcus au-reusATCC 6538 was the only strain to exhibit some susceptibility to four out of 10 anthocyanin-rich fractions tested. A vari-able susceptibility of S. aureus, Enterococcus faecalisATCC 10541, and Micrococcus luteusATCC 9341 to proanthocyani-din-rich fractions was also observed. Streptococcus mutansstrains as well as Escherichia coliATCC 10538 and PseudomonasaeruginosaATCC 27853 were not susceptible to any of the cranberry juice samples or fractions at the tested concentrations.There was no clear correlation between Gram-positive or Gram-negative bacterial susceptibility to cranberry juice. In thiswork, the role of cranberry juice anthocyanic and proanthocyanic fractions upon bacterial viability is discussed.
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