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Search Results: 1 - 10 of 326325 matches for " Marino S "
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Numerical model of steel slab reheating in pusher furnaces
Marino,P.; Pignotti,A.; Solís,D.;
Latin American applied research , 2002,
Abstract: the difficulty in measuring load temperatures inside reheating gas furnaces may be circumvented by appropriate use of on-line numerical models. in this article we describe a model of pusher furnaces, used to reheat steel slabs. the model uses thermocouple measurements at fixed positions inside the furnace to calculate the temperature of the combustion products, and takes into account radiative exchanges among those gases, the furnace refractories and the load. a good correlation is found between a temperature profile measured after the slab leaves the roughing stands and the results of the numerical calculations. we conclude that the model is a powerful tool to monitor the thermal state of the load inside the furnace and is suitable, together with an appropriate control algorithm, to automatically calculate the furnace settings required ensuring the objectives of the heating process.
YBCO THICK FILMS BY SOFT CHEMICAL MELT-ANNEALING METHOD
Garcés,Paula A.; Marino,Alvaro;
Revista Colombiana de Química , 2009,
Abstract: thick films (≥ 1 μm) of yba2cu3o7-δ were deposited by the dip-coating method on mgo (100) substrates at room temperature. after that, superconducting films were obtained by using the melt-annealing method with different thermal treatments. these films showed both different crystalline orientations and critical current densities (jc). additionally the thick films displayed superconducting transitions (tc) around 89.5 k and critical current densities ≥ 2x104 a/cm2 at 77 k and 0t. the highest tc and jc values achieved were attributed mainly to the higher oxygen content and the growth of larger grain sizes as determined by xrd and sem analysis respectively.
Numerical model of steel slab reheating in pusher furnaces
P. Marino,A. Pignotti,D. Solís
Latin American applied research , 2002,
Abstract: The difficulty in measuring load temperatures inside reheating gas furnaces may be circumvented by appropriate use of on-line numerical models. In this article we describe a model of pusher furnaces, used to reheat steel slabs. The model uses thermocouple measurements at fixed positions inside the furnace to calculate the temperature of the combustion products, and takes into account radiative exchanges among those gases, the furnace refractories and the load. A good correlation is found between a temperature profile measured after the slab leaves the roughing stands and the results of the numerical calculations. We conclude that the model is a powerful tool to monitor the thermal state of the load inside the furnace and is suitable, together with an appropriate control algorithm, to automatically calculate the furnace settings required ensuring the objectives of the heating process.
Effects of disorder in two-dimensional quantum antiferromagnets
C. M. S. Conceicao,E. C. Marino
Physics , 2003,
Abstract: We study the effects of disorder in two-dimensional quantum antiferromagnets on a square lattice, within the nonlinear sigma model approach, by using of a random distribution of spin stiffnesses or zero-temperature-spin-gaps, respectively, in the renormalized classical and quantum disordered phases. The quenched staggered magnetic susceptibility at low temperatures is evaluated in each case. The large distance behavior of the quenched spin correlation function is also obtained in the quantum disordered phase. Disorder is shown to introduce a change from exponential to power-law decay in these functions, indicating that the spin excitations become gapless, in spite of the fact that the system is in a disorder state. A comparison is made with the dual behavior of skyrmion topological excitations in the renormalized classical phase.
Nucleosynthesis in the Stellar Systems omega Cen and M22
G. S. Da Costa,A. F. Marino
Physics , 2010, DOI: 10.1071/AS10027
Abstract: The stellar system omega Centauri is well known for the large range in abundance among its member stars. Recent work has indicated that the globular cluster M22 (NGC 6656) also possesses an internal abundance range, albeit substantially smaller than that in omega Cen. Here we compare, as a function of [Fe/H], element-to-iron ratios in the two systems for a number of different elements using data from abundance analyses of red giant branch stars. It appears that the nucleosynthetic enrichment processes were very similar in these two systems despite the substantial difference in total mass.
Gastronomic Tourism: Attitudes, Motivations and Satisfaction of the Visitor in Cantons of Tungurahua, Ecuador  [PDF]
Tannia Elizabeth Huertas López, Yenis Cuétara Hernández, Leonardo Manuel Cuétara Sánchez, Milton Marino Villarreal Pastaz
American Journal of Industrial and Business Management (AJIBM) , 2019, DOI: 10.4236/ajibm.2019.93047
Abstract:
Gastronomic tourism is a new form of cultural tourism that seeks to satisfy the demand of a market segment related to the supply of food products. Regarding this purpose, Ecuador presents a mega diversity of flavors and natural products that reflect natural and cultural offering, particularly in gastronomy which has merged the Ecuadorian ancestral flavors with the techniques of contemporary cuisine. The purpose of this article is to characterize the segment of tourists and excursionists who are motivated to visit the cantons of Ambato, Banos and Mocha located in the province of Tungurahua due to their customs and gastronomic traditions. The methodology used is based on the philosophy of gastronomic marketing, especially, in the characterization of a set of socio-psychological variables related to the motivation and satisfaction of food and drink offerings in the selected cantons, by applying multivariate statistical and descriptive analysis tools. Among the conclusions of the study it is emphasized the need to develop a management strategy for the improvement in the visitor service delivery, the identification of new attractions, health conditions of the premises and service areas, as well as the timely marketing and promotion of the current gastronomic offering.
Traumatic callosotomy
Cukiert, Arthur;Haddad, Monica S.;Mussi, Antonio;Marino Jr, Raul;
Arquivos de Neuro-Psiquiatria , 1992, DOI: 10.1590/S0004-282X1992000300017
Abstract: in a 33 years-old epileptic woman with a traumatic impact to the vertex, clinical and radiological studies (skull x-r, ct and mri) disclosed an extensive, callosal section under the topography of the falx, associated to frontonasal contusions. there was a significant improvement in the epileptic syndrome. no interhemispheric disconnection syndrome could be determined, which is compatible with the posterior regions of the corpus callosum having been spared. this is, to the best of our knowledge, the most extensive callosal injury documented by mri to date.
Recursos eletrotermofototerapêuticos no tratamento da fibromialgia
Ferreira, Lucas Lima;Marino, Laís H. Carvalho;Cavenaghi, Simone;
Revista Dor , 2011, DOI: 10.1590/S1806-00132011000300012
Abstract: background and objectives: fibromyalgia (fm) is a syndrome of unknown etiology, chronic and non-articular, with typical features of pain diffused through the body, presence of specific tender points, muscle fatigue, sleep disorders, depressive symptoms and cognitive complaints. electrothermal and phototherapy are widely used in physical therapy as part of the global rehabilitation program to decrease fm symptoms. this study aimed at grouping and updating knowledge on electrothermal and phototherapeutic resources used to treat fm patients. contents: literature was researched in the electronic databases medline, lilacs, cochrane, pubmed and scielo, from january 2005 to december 2010, being found seven potentially relevant studies. among them, two have used low potency laser, four have used electrical stimulation and one has used therapeutic ultrasound. electrothermal and phototherapeutic resources have been increasingly used to treat pain, which is the primary fm symptom. conclusion: electrothermal and phototherapeutic resources have been a constant tool to treat fm, however new resources, such as transcranial stimulation currents have appeared. generalizations about the benefits of electrothermal and phototherapy, adverse effects and doses to treat fm still need further studies with higher methodological rigor.
Autologous stem cell transplantation for aggressive non-Hodgkin's lymphomas
Santini G.,Congiu A. M.,Nati S.,Marino G.
Revista Brasileira de Hematologia e Hemoterapia , 2002,
Abstract: Autologous stem cell transplantation (ASCT) has been seen to overcome resistance, allowing an increase in the dose of available drugs and radiotherapy. Initially used after first-line for relapsed or refractory non-Hodgkin's lymphomas (NHL), ASCT has since been used in more favourable clinical conditions such as partial remission (PR), first completeremission, and as front-line therapy following chemotherapy. High-dose chemotherapy and autologous stem-cell transplantation has now became the standard care for eligible patients with recurrent, chemosensitive aggressive NHL. Primary refractory patients and resistant relapse are not good indications and should be considered a group eligible for phase II studies. There may also be a role in patients with partially responsive disease. However new and larger randomised studies are needed to clarify this question. A challenge for lymphoma management is the evaluation of the role of high-dose therapy and ASCT as an initial treatment in aggressive NHL, identifying patients who will not be cured with standard therapy. A series of concurrent or retrospective analysis would indicate so-called "higher-risk patients", as defined by the IPI, as potential targets for intensified therapy. However, according to published data, the problem remains open to debate. Larger, randomised studies are necessary and welcome and this should be considered a high priority.
Serological follow-up of patients with paracoccidioidomycosis treated with itraconazole using Dot-blot, ELISA and Western-blot
MARTINS Rosana,MARQUES Sílvio,ALVES Marino,FECCHIO Denise
Revista do Instituto de Medicina Tropical de S?o Paulo , 1997,
Abstract: Twenty-seven mycologically proven cases of paracoccidioidomycosis (PCM) were treated with itraconazole (100-200 mg/day in month 1 and 100 mg/day until month 6-8) and evaluated clinically and serologically, up to 3.5 years post-therapy, using Dot-blot and ELISA for measuring the titers of IgG, IgA and IgM anti-P. brasiliensis antibodies and Western-blot for determining IgG, IgA and IgM antibodies against the antigen components of the fungus. Before treatment, 81.5% (Dot-blot) and 84% (ELISA) of the patients presented elevated IgG anti-P. brasiliensis antibody titers which dropped slightly with treatment. On the other hand, the percentages of pre-treatment high-titered sera for IgA and IgM anti-P.brasiliensis were lower (5l.9% and 5l.8%: Dot-blot; 16.5 and 36%: ELISA, respectively) but the titers tended to become negative more frequently with treatment. Prior to treatment, the percentages of positivity for IgG, IgA and IgM anti-P.brasiliensis antibodies in Western-blot were 96%, 20.8% and 41.6%, respectively. Antigens with molecular weights varying from 16-78 kDa, from 21-76 kDa and from 27-78 kDa were reactive for IgG, IgA and IgM antibodies, respectively. The most frequently reactive antigenic components had molecular weights of 27, 33 and 43 kDa for IgG, and 70 for IgA and IgM antibodies. During the period of study, the patients responded well to treatment. The present data confirm the diversity and complexity of the humoral response in PCM, and the importance of utilizing different serological tests to detect IgG, IgA and IgM anti-P. brasiliensis antibodies
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