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Search Results: 1 - 10 of 5738 matches for " TAIOLI FABIO "
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Fonte sísmica de pequeno diametro para ensaios entre furos de sondagens ("Crosshole")
Taioli, Fabio;
Revista Brasileira de Geofísica , 2001, DOI: 10.1590/S0102-261X2001000100007
Abstract: in civil engineering applications, the crosshole test is the most utilized method to determine the propagation velocities of in situ p and s waves of the different strata and, consequently, to calculate the dynamic elastic parameters of rock or soil samples. otherwise, its use has been limited just to very important studies since the associated cost is very high for smaller constructions such as residential and ordinary buildings. this is mainly due to the fact that the equipment normally used to perform these tests needs special boreholes, with diameter uncommon in the investigation phase. in order to decrease the crosshole overall cost, a simple and inexpensive seismic source was developed. this source can be used in the same boreholes made during the standard penetration test (spt). its maximum external diameter is 40 mm, fitting in a pvc casing of 50 mm external diameter (46 mm internal). at the same time, the casing can be easily installed in a 75 mm (3") maximum diameter, leaving place to fill the annular space with mortar. the seismic source clamps on the borehole wall by a pneumatic system and, by means of a sliding piston, generates mainly s type waves. it has proven to be easy to use besides being lightweight and of small size.
Contamination potential of the Ilhabela (SP) landfill
Anais da Academia Brasileira de Ciências , 2002,
Análise integrada de dados de sensoriamento remoto, geologia e geofísica no estudo de aqüífero fraturado, Lindóia - SP
Madrucci, Vanessa;Taioli, Fabio;Araújo, Carlos César de;
Revista Brasileira de Geofísica , 2005, DOI: 10.1590/S0102-261X2005000400007
Abstract: detecting groundwater in fractured aquifers is always a difficult task. this paper presents the detailed study of a fractured aquifer in lindóia region, s?o paulo, brazil. the study area was selected after a regional study analyzing the favorability for occurrence of groundwater which classified the area as being of excellent groundwater favorability. the study consisted on fractures mapping based on aerial photographs (scale 1:25,000) and geoelectrical survey (vertical electrical sounding and resistivity imaging). the geophysical data was processed, inverted and analyzed by using geological field data, wells data, springs data and fractures mapped using aerial photographs. the results show that it was possible to define favorable locations for the wells and optimize field work.
Métodos e técnicas geoelétricas rasas na delimita??o de área afetada por ruptura em teto de túnel urbano
Gallas, José D. F.;Taioli, Fabio;Malagutti Filho, Walter;Prado, Renato L.;Dourado, Jo?o C.;
Revista Brasileira de Geofísica , 2001, DOI: 10.1590/S0102-261X2001000100003
Abstract: this paper presents a case study where geophysics was successfully applied to solve a complex problem associated with a tunnel excavation accident in an urban area. it presents and describes the results obtained with geoelectrical methods applied in an emergencial task in a risky urban area in s?o paulo city. it also compares the techniques and field arrays, ways to present and interpret the data. the employed methods were electroresistivity, induced polarization (ip) and self potential (sp). the objective of the survey was to delineate the extension of a roof failure of an urban tunnel under excavation beneath the ibirapuera park in order to orientate the volume of tunnel roof should be treated. only two days (saturday and sunday) were available to carry out the survey and its interpretation. the results were considered satisfactory and brought a significant economy to the final cost of the tunnel. this economy was due to the decreasing of the remediation area from the initial 20 x 20 m (estimated by the engineers) to 3 x 5 m (estimated by the geophysical survey).
Desenvolvimento e testes de mini-sonda Wenner para avalia??o de contamina??es rasas
Taioli, Fabio;Gallas, José Domingos Faraco;Ribeiro, Vilmondes;Iezzi, Patrícia Braga Toledo;Nascimento, Diego Potomati Vaccaro;
Revista Brasileira de Geofísica , 2006, DOI: 10.1590/S0102-261X2006000400006
Abstract: the evaluation of soil and groundwater contamination has been an important task in the geosciences field and pushing on the methodological improvement. the contamination extension is normally investigated using geophysical methods or boreholes and chemical analysis. otherwise, several contamination problems are at low depths (less than 0.5m) allowing the easy access to the contaminated region. therefore, a low-cost and simple system (mini-probe wenner) was developed and tested and it is aimed at low depth resistivity measurements. the system is formed by a current source (ac) and a pvc probe which contains a wenner array with a electrode spacing of 1 cm. laboratory tests show that the current source works adequately in the resistance range normally associated with contaminated materials while the system tests (including the current source and probe) indicated apparent resistivity values very similar to the resistivity values calculated using the equation proposed by archie, in the 1.5 to 57 wm interval. preliminary field tests showed that the mini-probe is easily applicable in sandy and sand-silty soils while in clayey or hard soils is difficult its introduction. therefore, interesting applications to the proposed system are the study of agricultural areas or the study of contamination in predominantly sandy lithologies.
Contamina??o por chorume e sua detec??o por resistividade
Gallas, José Domingos Faraco;Taioli, Fabio;Silva, Sandra Márcia Cesário Pereira da;Coelho, Osmar Gustavo W?hl;Paim, Paulo Sérgio Gomes;
Revista Brasileira de Geofísica , 2005, DOI: 10.1590/S0102-261X2005000100005
Abstract: resistivity geophysical techniques were applied closed to the londrina's county sanitary landfill, allowing the detection and mapping of leachate contamination plume. the study area lies on the paraná basin which is locally represented by basaltic rocks of the serra geral formation. a correlation between lower resistivity values and the supposed leachate contaminations was stablished, once the electrical conduction, under natural conditions, occurs mainly in an ionic way, which are normally presented in the leachate. the main contamination flows in a general se direction. an unexpected finding of this work was the detection of another flux direction of contamination plume to sw, which flows trough horizontal fractures or alteration surfaces of basaltic contacts.
Finite-range effects in dilute Fermi gases at unitarity
Stefano Simonucci,Giovanni Garberoglio,Simone Taioli
Physics , 2011, DOI: 10.1103/PhysRevA.84.043639
Abstract: We develop a theoretical method going beyond the contact-interaction approximation frequently used in mean-field theories of many-fermion systems, based on the low-energy T-matrix of the pair potential to rigorously define the effective radius of the interaction. One of the main consequences of our approach is the possibility to investigate finite-density effects, which are outside the range of validity of approximations based on delta-like potentials. We apply our method to the calculation of density dependent properties of an ultracold gas of 6Li atoms at unitarity, whose two-body interaction potential is calculated using ab initio quantum chemistry methods. We find that density effects will be significant in ultracold gases with densities one order of magnitude higher than those attained in current experiments.
Tensile Structures of Cables Net, Guidelines to Design and Applications  [PDF]
Fabio Rizzo
Open Journal of Civil Engineering (OJCE) , 2016, DOI: 10.4236/ojce.2016.62023
Abstract: The structural engineering design of not conventional typologies imposes a complex path that begins evaluating procedures of a preliminary design and ends with complex procedures to validate the analysis response. Any guide lines to follow are often available. About complex shapes, in particular, any details are presented in the codes to evaluate wind action and so wind tunnel experiments are necessary to valuate this. The evaluation of wind tunnel data is a complex process that often needs new and specific subroutines programmed by researchers. The difficult increases when the objective is to study a not specific building but general aspects as for examples the dependence of a generic phenomenon by a geometric sample; in this case it is necessary to design and to program numerical subroutines before and then the wind tunnel experiments. Often, these subroutines are left detached and are non-generalizable process. Purpose of this paper is to describe a complete procedure to pre- and post-process wind tunnel data with the objective to design a not convectional structure as a tensile structure. In this particular case the research aim is a parametrization of the aerodynamic behavior of Hyperbolic Paraboloid roofs, shape used for cables net. The reason of the experiments is the absence in the international codes of the pressure coefficients for these geometries. The paper describes the numerical procedure evaluated to choose a sufficient representative geometric sample, the numerical procedure evaluated to design and to construct the wind tunnel models and FE models, the numerical procedure to evaluate and to use for FEM analyses of the wind tunnel data, the numerical procedure to calculate nonlinear structural analysis, and, finally some applications. All these numerical procedures use basic theory derived for example by the cable theory, the fluid mechanic, the nonlinear geometric analysis and other. However specific codes were necessary and were programmed to apply the theories on the specific case of study; the complete methodology followed is presented. The goal is to create a free open domain where the numerical procedures evaluated are merged, added, modified by researchers with the aim to obtain a common space of use for wind engineering of not conventional structure.
Evolving Concepts: How Diet and the Intestinal Microbiome Act as Modulators of Breast Malignancy
Iuliana Shapira,Keith Sultan,Annette Lee,Emanuela Taioli
ISRN Oncology , 2013, DOI: 10.1155/2013/693920
Abstract: The intestinal microbiome plays an important role in human physiology. Next-generation sequencing technologies, knockout and gnotobiotic mouse models, fecal transplant data and epidemiologic studies have accelerated our understanding of microbiome abnormalities seen in immune diseases and malignancies. Dysbiosis is the disturbed microbiome ecology secondary to external pressures such as host diseases, medications, diet and genetic conditions often leading to abnormalities of the host immune system. Specifically dysbiosis has been shown to lower circulating lymphocytes, and increase neutrophil to lymphocyte ratio, a finding which has been associated with a decreased survival in women with breast cancers. Dysbiosis also plays a role in the recycling of estrogens via the entero-hepatic circulation, increasing estrogenic potency in the host, which is another leading cause of breast malignancy. Non-modifiable factors such as age and genetic mutations disrupt the microbiome, but modifiable factors such as diet may also lead to profound disruptions as well. A better understanding of dietary factors and how they disrupt the microbiome may lead to beneficial nutritional interventions for breast cancer patients. 1. Introduction The human digestive tract is known to host trillions of microbes collectively called the intestinal microbiota [1–4]. A commensally, mutually beneficial relationship exists between the human host and these microbiota. The host’s digestive tract provides the nutrient niche for the microbiota, while the microbiota protects against pathogens, helps in the development of the immune system, aids in nutrient reclamation from food by fermenting indigestible fiber to short chain fatty acids, produces essential amino acids and vitamins, helps in the absorption of minerals, and aids the breakdown of dietary toxins and carcinogens [1–3, 5]. The intestinal microbiota also helps the growth and differentiation of enterocytes and colonocytes, thus maintaining the intestinal barrier against potential pathogens [6]. 2. Origin of Microbiome The intestinal microbiota is maternally inherited at birth as the newborn is delivered through the vaginal canal [7–9]. Later in development, factors both dependent on host choices such as diet and independent of host choices such as genetics and age modify the intestinal microbiota [10]. Insights into the dynamic structure of intestinal microbiota have become possible with the advent of next-generation sequencing technologies; such technologies are able to fully characterize the polymorphism of bacterial communities
Mixed ab initio quantum mechanical and Monte Carlo calculations of secondary emission from SiO2 nanoclusters
Simone Taioli,Stefano Simonucci,Lucia Calliari,Massimiliano Filippi,Maurizio Dapor
Physics , 2009, DOI: 10.1103/PhysRevB.79.085432
Abstract: A mixed quantum mechanical and Monte Carlo method for calculating Auger spectra from nanoclusters is presented. The approach, based on a cluster method, consists of two steps. Ab initio quantum mechanical calculations are first performed to obtain accurate energy and probability distributions of the generated Auger electrons. In a second step, using the calculated line shape as electron source, the Monte Carlo method is used to simulate the effect of inelastic losses on the original Auger line shape. The resulting spectrum can be directly compared to 'as-acquired' experimental spectra, thus avoiding background subtraction or deconvolution procedures. As a case study, the O K-LL spectrum from solid SiO2 is considered. Spectra computed before or after the electron has traveled through the solid, i.e., unaffected or affected by extrinsic energy losses, are compared to the pertinent experimental spectra measured within our group. Both transition energies and relative intensities are well reproduced.
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