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Search Results: 1 - 10 of 1302 matches for " Charlie Antoni; "
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Avalia??o dos custos para realiza??o de controles de qualidade de radiofármacos marcados com [99mTc]tecnécio em servi?os de medicina nuclear no Brasil
Faria, Daniele de Paula;Marques, Fabio Luiz Navarro;Yamada, Airton Seiji;Miquelin, Charlie Antoni;
Radiologia Brasileira , 2011, DOI: 10.1590/S0100-39842011000100012
Abstract: objective: to establish the costs for quality control of [99mtc]technetium radiopharmaceuticals in brazilian nuclear medicine centers, in compliance with agência nacional de vigilancia sanitária (national health surveillance agency) resolutions rdc no. 38/2008 and no. 63/2009. materials and methods: prices for consumables, equipment and labor involved in quality control procedures were calculated and the values were converted into units of volume, time or other appropriate units for use in mathematical formulas for determining unit prices. results: estimated investment for acquisition of consumables and equipment was r$ 35,500.00. the final unit cost for quality control of a [99mtc]technetium radiopharmaceutical kit ranged from r$ 6.44 to r$ 7.80 per kit, depending on the product under analysis, on the methodology applied and on the qualification of the professional involved in the process. such values may correspond to 0.5% to 10% of the amount received by the institution per diagnostic procedure. in practice the effective cost might be lower, considering that a single labeled kit can be fractionated into several doses. conclusion: considering the gains in quality and patients' safety, the authors conclude that costs for implementing a quality control program for radiopharmaceuticals can be absorbed in the financial planning of nuclear medicine centers.
Vulnerabilities of LDAP As An Authentication Service  [PDF]
Charlie Obimbo, Benjamin Ferriman
Journal of Information Security (JIS) , 2011, DOI: 10.4236/jis.2011.24015
Abstract: Lightweight Directory Access Protocol (LDAP) servers are widely used to authenticate users in enterprise level networks. Organizations such as universities and small to medium-sized businesses use LDAP for a variety of applications including e-mail clients, SSH, and workstation authentication. Since many organizations build dependencies on the LDAP service, a Denial-of-Service (DoS) attack to the service can cause a greater number of services disrupted. This paper examines the danger in the use of LDAP for user authentication by executing a DoS attack exploiting the TCP three-way handshake required when initializing a connection to an LDAP server.
DEVELOPMENT OF NON-DESTRUCTIVE MONITORING SYSTEM FOR CHLORIDE PENETRATION INTO REINFORCED CONCRETE STRUCTURES
Antoni Antoni
Civil Engineering Dimension , 2006,
Abstract: Reinforced concrete structures in marine environment are subjected to chloride penetration, which significantly degrades the structural performance due to the occurrence of corrosion in the steel reinforcement. The performance degradation of the structures would reduce the intended service life and caused higher maintenance and repair cost. Therefore, system to monitor chloride penetration into reinforced concrete before the starting corrosion of reinforcement is indispensable. An embedded probe system to detect chloride penetration into concrete was developed in Japan. This probe consists of a cementitious material body and some number of wires as sensors, which are set in the shallow ditches around the probe body. The system detect the chloride penetration by monitoring the initiation time of wire corrosion, it also has the advantages of continuous monitoring and early warning on the onset of corrosion in the reinforcement. However, the probe had not yet had high sensitivity for detecting critical chloride content in concrete. Therefore to increase its sensitivity, four types of improvements, namely partial coating of the wires, waterproofing on the probe body, filling the ditches with porous material and supplying small current on the wires were evaluated in this study. From the experimental result, it was observed that supplying small current and partial coating of the wires could improve the sensitivity of the probe significantly, while waterproofing treatment on the probe body and filling the ditches did not have significant contribution.
Chloride Penetration into Fiber Reinforced Concrete under Static and Cyclic Compressive Loading
Antoni Antoni
Civil Engineering Dimension , 2008,
Abstract: The effect of loading on the chloride penetration into plain concrete (PC) and fiber reinforced concrete (FRC) was studied experimentally by using modified NT Build 492 – Non-steady state chloride migration test that include the application of loading on the specimen during the test. Three types of polypropylene fibers with different lengths and shapes were used. The concretes were tested for chloride penetration at different stress ratios under static and cyclic loading. The results of the static loading showed that there was a slight reduction in the chloride penetration under low level of compressive stress while an increase in the chloride penetration was found at higher stress level. There are significance difference in chloride penetration behavior of the plain concrete, long fiber FRC and short fiber FRC. Chloride penetration increased even more at cyclic loading conditions showing difference behavior of FRC and PC at difference number of cycle and load level.
Chesapeake Bay Tidal Characteristics  [PDF]
Yi Xiong, Charlie R. Berger
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.27071
Abstract: The basic knowledge of tidal characteristics in Chesapeake Bay is a prerequisite to understand the tidal processes in Chesapeake Bay. The tidal characteristics in Chesapeake Bay were assessed in this paper using basic tidal hydraulic analysis. Tidal elevation, currents and salinity data of Chesapeake Bay from National Oceanic and Atmospheric Administration (NOAA) were retrieved, and analyzed to understand Chesapeake Bay tide. General knowledge of location, geometry, tides, freshwater inputs, wind, salinity, etc in Chesapeake Bay was described. Sediment distribution of Chesapeake Bay was briefly described and discussed. Amplitude and phase of the selected major constituent, form factor, phase difference between tide elevations and currents at a few tidal elevation stations within Chesapeake Bay were calculated. Tidal prism was figured out using cubature method. The analysis approach could also be used as a source of reference for basic tidal study in other tide-affected field.
L’épistème ethno-anthropologique corse.
Charlie Galibert
EspacesTemps.net , 2005,
Abstract: L’épistème ethno-anthropologique corse couvre un continuum qui va 1) d’une approche ethnologique classique en termes d’observation distanciée ( etic ), a) d’une part, dans le champ de la production économico-écologique des rapports sociaux, où elle prend la forme de la monographie de la communauté rurale, b) d’autre part, dans le champ symbolique appréhendé en tant que domaine du sens et des valeurs, à 2) une observation participante ayant l’ambition de pratiquer une anthropologie du point de vue de l’acteur ( emic ), qui implique l'observateur natif dans son objet même. On peut resituer cette constellation épistémique dans l’héritage d’une anthropologie scindée en sociale (considérée comme une science naturelle) et en culturelle (appréhendée comme un art), mais cette configuration illustre également la conjonction historique du retour sur soi de l’ethnologie et d’une revendication identitaire à l’égard de la culture, des savoirs et traditions du groupe d'appartenance. Les deux grands versants de cette configuration épistémique sont présentés et commentés, des premières recherches à nos jours. The Corsican ethno-anthropologic configuration presents a double face. On one hand, a classical ethnological approach in terms of etic observation (firstly, concerning the field of the economical and ecological monographic perspective of a rural community, secondly, in the symbolic perspective), on the other hand, a modernist approach in terms of emic observation, which implicates the native anthropologist in his/her object. This configuration duplicates the historical and epistemological distinction between social anthropology (apprehended as a natural science) and cultural anthropology (apprehended as an art). But it is also the illustration of ethnology’s current introspection, and a claim for identity about self-culture of the native anthropologist. The two faces of this configuration have been examined from the first studies carried out in Corsica to the contemporary period.
Cholecysto-Colonic Fistula
Charlie Chen
Calicut Medical Journal , 2008,
Abstract: The patient is a 77-year-old woman whopresented with a 4-day history of diarrheaand right-sided abdominal pain. Diagnosisby history and physical examination wasdifficult due to nonspecific signs andsymptoms. Laparoscopic surgery revealed arare cholecysto-colonic fistula as an unusualcomplication of cholelithiasis.
Dust attenuation in the restframe ultraviolet: constraints from star-forming galaxies at z~1
Charlie Conroy
Physics , 2009, DOI: 10.1111/j.1365-2966.2010.16266.x
Abstract: A novel technique is employed for estimating attenuation curves in galaxies where only photometry and spectroscopic redshifts are available. This technique provides a powerful measure of particular extinction features such as the UV bump at 2175\A, which has been observed in environments ranging from the Milky Way to high-redshift star-forming galaxies. Knowledge of the typical strength of the UV bump as a function of environment and redshift is crucial for converting restframe UV flux into star formation rates. The UV bump will impart a unique signature as it moves through various filters due to redshifting; its presence can therefore be disentangled from other stellar population effects. The utility of this technique is demonstrated with a large sample of galaxies drawn from the DEEP2 Galaxy Redshift Survey. The observed B-R color of star-forming galaxies at 0.6
Modeling the Panchromatic Spectral Energy Distributions of Galaxies
Charlie Conroy
Physics , 2013, DOI: 10.1146/annurev-astro-082812-141017
Abstract: The spectral energy distributions (SEDs) of galaxies are shaped by nearly every physical property of the system, including the star formation history, metal content, abundance pattern, dust mass, grain size distribution, star-dust geometry, and interstellar radiation field. The principal goal of stellar population synthesis (SPS) is to extract these variables from observed SEDs. In this review I provide an overview of the SPS technique and discuss what can be reliably measured from galaxy SEDs. Topics include stellar masses, star formation rates and histories, metallicities and abundance patterns, dust properties, and the stellar initial mass function.
On The Birth Masses of the Ancient Globular Clusters
Charlie Conroy
Physics , 2011, DOI: 10.1088/0004-637X/758/1/21
Abstract: All globular clusters (GCs) studied to date show evidence for internal variation in their light element abundances. These variations have been interpreted as evidence for multiple star formation episodes within GCs, with secondary episodes fueled, at least in part, by the ejecta of AGB stars from a first generation of stars. A major puzzle emerging from this otherwise plausible scenario is that the fraction of stars associated with the second episode of star formation is observed to be much larger than expected for a standard IMF. The present work investigates this tension by modeling the observed anti-correlation between [Na/Fe] and [O/Fe] for 20 Galactic GCs. If the abundance pattern of the retained AGB ejecta does not depend on GC mass at fixed [Fe/H], then a strong correlation is found between the fraction of current GC stellar mass comprised of pure AGB ejecta, f_p, and GC mass. This fraction varies from 0.20 at low masses (10^4.5 Msun) to 0.45 at high masses (10^6.5 Msun). The fraction of mass associated with pure AGB ejecta is directly related to the total mass of the cluster at birth; the ratio between the initial and present mass in stars can therefore be derived. Assuming a star formation efficiency of 50%, the observed Na-O anti-correlations imply that GCs were at least 10-20 times more massive at birth. These factors are lower limits because any mass-loss mechanism that removes first and second generation stars equally will leave f_p unchanged. The mass-dependence of f_p probably arises because lower mass GCs are unable to retain all of the AGB ejecta from the first stellar generation. Recent observations of elemental abundances in intermediate-age LMC clusters are re-interpreted and shown to be consistent with this basic scenario. A convincing explanation of these trends is currently lacking.
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