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Search Results: 1 - 10 of 94 matches for " Mondelli "
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Determinantes dos arranjos contratuais: o caso da transa??o produtor-processador de carne bovina no Uruguai
Mondelli, Mario;Zylbersztajn, Decio;
Revista de Economia e Sociologia Rural , 2008, DOI: 10.1590/S0103-20032008000300010
Abstract: what are the determinants of the commercial channel choice in the beef producers-processors transactions? the question refers to the coordination and production control problem associated to changes in consumer's awareness of specific attributes in food products. two contractual arrangements coexist in this transaction: direct-contracting and broker-induced transactions transaction cost economic offers helpful insights to understand the reason for the development and adaptations of different contractual arrangement moved by transaction cost economizing perspective. the empirical analysis is focused in the uruguayan beef agro-industrial system. analysis integrates (i) institutional and organizational changes in the beef industry; (ii) based on the analysis of the transaction dimensions (frequency, asset specificity and uncertainty) we address hypothesis of the determinants of the contractual arrangement in the beef producers-processors transaction; and (iii) we run a statistical test of the hypotheses based on a logit model. we used a panel data with producers-processors transaction from uruguayan agricultural bureau (77,000 transactions). we confirm the hypotheses of the determinants of the contractual arrangement choice. the probability of a transaction being aligned with the direct contractual arrangement increase in transaction with higher asset specificity (i.e., young steer), lower distance between the producer and the processor, and with higher frequency of transaction.
Synthesis and X-Ray Diffraction Analyses of Calcium Hydroxide Nanoparticles in Aqueous Suspension  [PDF]
G. Taglieri, C. Mondelli, V. Daniele, E. Pusceddu, A. Trapananti
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.31A013
Abstract:

Calcium hydroxide nanoparticles in aqueous suspensions (also called nanolime) were successfully employed in Cultural Heritage conservation thanks to the ability of favoring readhesion of the pictorial layer on original carbonatic substrates or allowing to a better superficial cohesion and protection of treated stones. In this work, we have synthesized nanolime particles in aqueous suspension by two different methods. The produced particles were characterized in the laboratory, in terms of structural and morphological features, by means of X-Ray diffraction powder (XRD) and by transmission electron microscopy (TEM), respectively. Nanoparticles were crystalline, regularly shaped, hexagonally plated and with side dimensions generally ranging from 300 nm to 30 nm or less. Crystal structure of nanolime particles directly in the aqueous suspension, has been also analyzed by synchrotron diffraction from X-ray synchrotron radiation (SR-XRD); data have been analyzed by means of the Rietveld method and we have investigated the structure of Ca(OH)2 particles in suspension in terms of cell parameters, atomic coordinates, bond lengths and angles.


Synthesis, Textural and Structural Properties of Calcium Hydroxide Nanoparticles in Hydro-Alcoholic Suspension  [PDF]
Giuliana Taglieri, Claudia Mondelli, Valeria Daniele, Emanuela Pusceddu, Giancarlo Scoccia
Advances in Materials Physics and Chemistry (AMPC) , 2014, DOI: 10.4236/ampc.2014.43008
Abstract: The use of calcium hydroxide nanoparticles (nanolime) in hydro-alcoholic suspensions represents a good enhancement in particular in the conservation of stones and surfaces of interest in Cultural Heritage. In this work we have produced nanolime by using our alternative method of synthesis (based on the use of a surfactant agent in the original solution) and we have studied, for the first time, structural and morphological properties of the synthesized nanoparticles directly in hydro-alcoholic suspension by synchrotron X-ray diffraction technique and transmission electron micro-scope observations. The particles characterization was performed on suspensions synthesized by varying surfactant content in the synthesis procedure and the water/alcohol ratio, too. We have found that only pure and crystalline Ca(OH)2 particles produced during the synthesis procedure and they maintained stably in suspension. These particles were hexagonally plated and regularly shaped with side dimension ranging from 300 to 40 nm or less; they had a platy habit and they presented, particularly with high alcohol content in suspension, a preferred orientation along z-axis.
Relation between arterial hypertension and hearing loss
Mondelli, Maria Fernanda Capoani Garcia,Mondelli, Maria Fernanda Capoani Garcia
International Archives of Otorhinolaryngology , 2009,
Abstract: Objective: To verify the relationship between systemic arterial hypertension (SAH) and hearing loss in middle-aged patient. Method: This study was carried out in the period from January to December 2007. The research was composed by 392 patients of both genders, aged from 45 to 60 years old. Anamnesis and threshold tonal audiometry data were analyzed. Results: There was a significant association between SAH and hearing loss. Conclusion: The results showed an evident association between SAH and hearing loss, which requires the disclosure of a preventive process.
Estudo comparativo da resistência adesiva da interface resina/braquete, sob esfor?os de cisalhamento, empregando três resinas compostas e três tipos de tratamento na base do braquete
Mondelli, Adriano Lia;Feitas, Marcos Roberto de;
Revista Dental Press de Ortodontia e Ortopedia Facial , 2007, DOI: 10.1590/S1415-54192007000300012
Abstract: aim: considering that the adhesion between the brackets and the resin is chemo-mechanical, the aim of this study was to investigate: 1) the efficacy of the method used to assess the bond strength at the resin/bracket interface; 2) the shear bond strength of the resin/bracket interface using three resin composites (concise orthodontic, transbond xt and filtek z-250); 3) the effect of sandblasting of the base of the metallic bracket with aluminum oxide, associated or not to the application of adhesive. methods: shear bond strength was carried out at a universal testing machine. data were submitted to analysis of variance and tukey multiple comparison test. resuls and conclusions: the occurrence of 12.5% of cohesive failures may be considered minimal, thus indicating that the method is appropriate to assess the bond strength at the resin/bracket interface. the different resin composites (concise orthodontic, transbond xt and filtek z-250) used for bonding without any previous surface treatment of the bracket (control groups) resulted in similar shear bond strength. the application of adhesive, with or without previous sandblasting of the base of the bracket, improved the shear bond strength for the concise orthodontic resin composite, when compared to its control group. sandblasting of the bracket, regardless of the combined use of adhesive, was statistically superior for the transbond xt resin composite when compared to its control group. the application of the adhesive single bond in the base of the bracket, with or without previous sandblasting, promoted a decrease in the shear bond strength for the filtek z-250 resin composite. sandblasting of the metallic bracket with aluminum oxide improved the adhesion at the resin/bracket interface for all the resin composites used in this study.
Fracture resistance of weakened teeth restored with condensable resin with and without cusp coverage
Mondelli, Rafael Francisco Lia;Ishikiriama, Sérgio Kiyoshi;Oliveira Filho, Otávio de;Mondelli, José;
Journal of Applied Oral Science , 2009, DOI: 10.1590/S1678-77572009000300006
Abstract: objectives: this in vitro study evaluated the fracture resistance of weakened human premolars (mod cavity preparation and pulp chamber roof removal) restored with condensable resin composite with and without cusp coverage. material and methods: thirty human maxillary premolars were divided into three groups: group a (control), sound teeth; group b, wide mod cavities prepared and the pulp chamber roof removed and restored with resin composite without cusp coverage; group c, same as group b with 2.0 mm of buccal and palatal cusps reduced and restored with the same resin. the teeth were included in metal rings with self-curing acrylic resin, stored in water for 24 h and thereafter subjected to a compressive axial load in a universal testing machine at 0.5 mm/min. results: the mean fracture resistance values ± standart deviation (kgf) were: group a: 151.40 ± 55.32, group b: 60.54 ± 12.61, group c: 141.90 ± 30.82. statistically significant differences were found only between group b and the other groups (p<0.05). the condensable resin restoration of weakened human premolars with cusp coverage significantly increased the fracture resistance of the teeth as compared to teeth restored without cusp coverage. conclusion: the results showed that cusp coverage with condensable resin might be a safe option for restoring weakened endodontically treated teeth.
Surface roughness average and scanning electron microscopic observations of resin luting agents
Mondelli, Rafael Francisco Lia;Prakki, Anuradha;Cilli, Renato;Navarro, Maria Fidela de Lima;Mondelli, José;
Journal of Applied Oral Science , 2003, DOI: 10.1590/S1678-77572003000400010
Abstract: the objective of this work was to evaluate the surface roughness changes of three current resin cements after tooth brushing simulation, as well as discuss its relation with scanning electron microscopic observations. the materials employed were enforce sure cure (dentsply), rely x (3m-espe) and variolink ii (vivadent). they were subjected to brushing abrasion (100,000 strokes for each specimen) and the surface roughness alterations (before and after strokes) were detected. for each roughness test condition, specimens were coated with gold-palladium and observed on a dsm 900 zeiss scanning electron microscope. roughness changes values (ra) were statistically increased after brushing strokes. based on the microscopic observations and roughness changes analysis, all cements studied became rougher after brushing strokes.
Self-distribution-function procedure in elastic incoherent neutron scattering for biosystems molecular motion characterization
Salvatore Magazù,Federica Migliardo,Antonio Benedetto,Miguel Gonzalez,Claudia Mondelli
Spectroscopy: An International Journal , 2010, DOI: 10.3233/spe-2010-0454
Abstract: In the present contribution we present a new procedure for the Mean Square Displacement (MSD) determination from Elastic Incoherent Neutron Scattering (EINS) where the connection between the Self-Distribution Function (SDF) and the measured EINS intensity profile is highlighted. We show how the SDF procedure allows both the total and the partial MSD evaluation, through the total and the partial SDFs. The procedure is applied on EINS data collected, by the IN13 backscattering spectrometer (ILL, Grenoble), on aqueous mixtures of sucrose and trehalose.
Progesterone - new therapy in mild carpal tunnel syndrome? Study design of a randomized clinical trial for local therapy
Paolo Milani, Mauro Mondelli, Federica Ginanneschi, Riccardo Mazzocchio, Alessandro Rossi
Journal of Brachial Plexus and Peripheral Nerve Injury , 2010, DOI: 10.1186/1749-7221-5-11
Abstract: Neuroprotection and myelin repair actions of the progesterone was demonstrated in vivo and in vitro study.We report the design of a randomized controlled trial for the local injection of cortisone versus progesterone in "mild" idiopathic CTS.Sixty women with age between 18 and 60 years affected by "mild" idiopathic CTS, diagnosed on the basis of clinical and electrodiagnostic tests, will be enrolled in one centre. The clinical, electrophysiological and ultasonographic findings of the patients will be evaluate at baseline, 1, 6 and 12 months after injection.The major outcome of this study is to determine whether locally-injected progesterone may be more beneficial than cortisone in CTS at clinical levels, tested with symptoms severity self-administered Boston Questionnaire and with visual analogue pain scale.Secondary outcome measures are: duration of experimental therapy; improvement of electrodiagnostic and ultrasonographic anomalies at various follow-up; comparison of the beneficial and harmful effects of the cortisone versus progesterone.We have designed a randomized controlled study to show the clinical effectiveness of local progesterone in the most frequent human focal peripheral mononeuropathy and to demonstrate the neuroprotective effects of the progesterone at the level of the peripheral nervous system in humans.Fifty years after its widespread recognition, a significant minority of patients with carpal tunnel syndrome continue to experience poor outcomes from treatment. Much of the current treatment is supported by inadequate or nonexistent evidence. Surgical decompression, often considered the definitive solution, leads to positive results in 75% of the cases, but leaves 8% of patients worse than before [1].Open release is the preferred surgical procedure. Some patients referred failure to relieve symptoms after decompression surgery, and reoperation is sometimes necessary. This is consequence of incomplete release of the flexor retinaculum, scarring arou
Effect of conventional and experimental gingival retraction solutions on the tensile strength and inhibition of polymerization of four types of impression materials
Sábio, Sérgio;Franciscone, Paulo Afonso;Mondelli, José;
Journal of Applied Oral Science , 2008, DOI: 10.1590/S1678-77572008000400010
Abstract: in the present study, two types of tests (tensile strength test and polymerization inhibition test) were performed to evaluate the physical and chemical properties of four impression materials [a polysulfide (permlastic), a polyether (impregum), a condensation silicone (xantopren) and a polyvinylsiloxane (aquasil) ,3; when polymerized in contact with of one conventional (hemostop) and two experimental (vislin and afrin) gingival retraction solutions. for the tensile strength test, the impression materials were mixed and packed into a steel plate with perforations that had residues of the gingival retraction solutions. after polymerization, the specimens were tested in tensile strength in a universal testing machine. for the polymerization inhibition test, specimens were obtained after taking impressions from a matrix with perforations that contained 1 drop of the gingival retraction solutions. two independent examiners decided on whether or not impression material remnants remained unpolymerized, indicating interference of the chemical solutions. based on the analysis of the results of both tests, the following conclusions were reached: 1. the tensile strength of the polysulfide decreased after contact with hemostop and afrin. 2. none of the chemical solutions inhibited the polymerization of the polysulfide; 3. the polyether presented lower tensile strength after polymerization in contact with the three gingival retraction agents; 4. the polyether had its polymerization inhibited only by hemostop; 5. none of the chemical solutions affected the tensile strength of the condensation silicone; 6. only hemostop inhibited the polymerization of the condensation silicone; 7. the polyvinylsiloxane specimens polymerized in contact with hemostop had significantly lower tensile strength; 8. neither of the chemical solutions (afrin and vislin) affected the tensile strength of the polyvinylsiloxane and the condensation silicone; 9. results of the tensile strength and polymerizati
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