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Search Results: 1 - 10 of 30399 matches for " Jose Roberto; "
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Thermal Modeling of a Novel Heated Tip Injector for Otto Cycle Engines Powered by Ethanol  [PDF]
Alexandre Rezende, Jose Roberto Simoes-Moreira
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.42012
Abstract: This work presents a thermal modeling of a new cold-start system technology designed for Otto cycle combustion based on the electromagnetic heating principle. Firstly, the paper presents a state-of-the-art review and presents the context of automobile industry where heated injectors are necessary. The novel method of electromagnetic heating principle to solve the cold-start problem is still in the development phase and it enables engine starting at low temperatures in vehicles powered by ethanol or flex-fuel vehicles (FFV). This new system technology should be available as an alternative to replace the existing system. Currently, the cold-start system uses an auxiliary gasoline tank, which brings some inconvenience for the user. Secondly, the aim was also to create a physical model that takes into consideration all the parameters involved on the heating process such as power heating and average heat transfer coefficient. The study is based on the lumped system theory to model the ethanol heating process. From the analysis, two ordinary differential equations arise, which allowed an analytical solution. Particularly, an ethanol heating curve inside the injector was obtained, an important parameter in the process. Comparison with experimental data from other authors is also provided. Finally, a sensitivity analysis of controlling parameters such as heating power and heat transfer coefficient variation. The paper is concluded with suggestions for further studies.
A paisagem do diabo contemporaneo - como a dinamica espacial articula as transforma es da paisagem urbana segregando classes sociais
Roberto Jose Hezer Moreira Vervloet
Geografares , 2002,
Abstract: Visando n o confundir paisagem com espa o geográfico, este texto tenta levantar a quest o das transforma es da paisagem urbana diante do processode reprodu o do capital, sem levantar polêmicas.Tenta sistematizar um conjunto de idéias para explicar a articula o da reprodu o do espa o desigualcriador de paisagens urbanas fragmentárias. N odeixando de discutir a quest o da paisagem urbanae sua rela o com o espa o e o cotidiano do homemcontemporaneo, acaba por concluir a quest o da interven o e do planejamento da paisagem urbanacomo um processo que passa pela interven o nadinamica espacial.
New Frontiers in Pediatric Medulloblastoma
Roberto Jose Diaz,Eric Bouffet
University of Toronto Medical Journal , 2006, DOI: 10.5015/utmj.v84i1.271
Modelling the Dynamics of the Work-Employment System by Predator-Prey Interactions
Nilo Serpa,Jose Roberto Steiner
Physics , 2011,
Abstract: The broad application range of the predator-prey modelling enabled us to apply it to represent the dynamics of the work-employment system. For the adopted period, we conclude that this dynamics is chaotic in the beginning of the time series and tends to less perturbed states, as time goes by, due to public policies and hidden intrinsic system features. Basic Lotka-Volterra approach was revised and adapted to the reality of the study. The final aim is to provide managers with generalized theoretical elements that allow to a more accurate understanding of the behavior of the work-employment system.
Magnetohydrodynamic Waves in Partially Ionized Prominence Plasmas
Roberto Soler,Jose Luis Ballester
Physics , 2012, DOI: 10.1007/978-3-642-30442-2_13
Abstract: Prominences or filaments are cool clouds of partially ionized plasma living in the solar corona. Ground- and space-based observations have confirmed the presence of oscillatory motions in prominences and they have been interpreted in terms of magnetohydrodynamic (MHD) waves. Existing observational evidence points out that these oscillatory motions are damped in short spatial and temporal scales by some still not well known physical mechanism(s). Since prominences are partially ionized plasmas, a potential mechanism able to damp these oscillations could be ion-neutral collisions. Here, we will review the work done on the effects of partial ionization on MHD waves in prominence plasmas.
Liver Metastases from Gynecological Cancers: Time to Resection?  [PDF]
Jose M. Ramia, Roberto De La Plaza, Jose Qui?ones, Pilar Veguillas, Farah Adel, Jorge García-Parre?o
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.33024
Abstract: Aim: To perform an update of liver resection as treatment of liver metastases of gynecological cancers, as well as an update on these metastases. Bibliographical search: PubMed Search 1990-2011 in English language. Authors reviewed only relevant articles. Results: No more than 20 relevant articles have been published on this topic, including case reports. We performed a classical review of the information published in the literature. Conclusions: Liver Metastases from Gynecological cancers, not peritoneal implants in the liver, usually appear in patients with disseminated disease, so it is uncommon to perform a liver resection. In some patients with limited extrahepatic disease or only liver disease, liver resection is a safe alternative and improves the oncological results. We try to emphasize which patients may benefit from liver resection and the importance of tailoring medical decisions.
Analysis of Lattice Size, Energy Density and Denaturation for a One-Dimensional DNA Model  [PDF]
Gabriel Gouvea Slade, Natalia Favaro Ribeiro, Elso Drigo Filho, Jose Roberto Ruggiero
World Journal of Mechanics (WJM) , 2012, DOI: 10.4236/wjm.2012.22010
Abstract: There are several mechanical models to describe the DNA phenomenology. In this work the DNA denaturation is studied under thermodynamical and dynamical point of view using the well known Peyrard-Bishop model. The thermodynamics analysis using the transfer integral operator method is briefly reviewed. In particular, the lattice size is discussed and a conjecture about the minimum energy to denaturation is proposed. In terms of the dynamical aspects of the model, the equations of motion for the system are integrated and the results determine the energy density where the denatura- tion occurs. The behavior of the lattice near the phase transition is analyzed. The relation between the thermodynamical and dynamical results is discussed.
Diverse Bacterial PKS Sequences Derived From Okadaic Acid-Producing Dinoflagellates
Roberto Perez,Li Liu,Jose Lopez,Tianying An
Marine Drugs , 2008,
Abstract: Okadaic acid (OA) and the related dinophysistoxins are isolated from dinoflagellates of the genus Prorocentrum and Dinophysis. Bacteria of the Roseobacter group have been associated with okadaic acid producing dinoflagellates and have been previously implicated in OA production. Analysis of 16S rRNA libraries reveals that Roseobacter are the most abundant bacteria associated with OA producing dinoflagellates of the genus Prorocentrum and are not found in association with non-toxic dinoflagellates. While some polyketide synthase (PKS) genes form a highly supported Prorocentrum clade, most appear to be bacterial, but unrelated to Roseobacter or Alpha-Proteobacterial PKSs or those derived from other Alveolates Karenia brevis or Crytosporidium parvum.
Marcos Bader,Jose Roberto Ferreira Savoia
Revista de Administra??o de Empresas , 2013,
Abstract: Thoughts about the logistical design of the distribution of financial services among the Brazilian people, with signs of new opportunities and focus on inclusion.
Jose Luis Rodriguez,Roberto Arteaga Crespo
Electronic Journal of Biomedicine , 2008,
Abstract: Chronic Renal Failure (CRF) is a major public health problem. Early diagnosis and treatment are basic for its prognosis, and it will be fundamental for the future necessity of substitutive renal treatment. For this purpose, determining the etiology of CRF may be helpful.This study was conducted in the Nephrology Department at the Central Military Hospital in Sana’a, Yemen from 2004 to 2007; to determine the etiology of CRF in 334 patients (211 men and 123 women) on regular hemodialysis.The Hypertensive Nephropathies (24%) was the commonest cause of CRF. Diabetic Nephropathies (20%), Obstructive Nephropathy (16%), Chronic Pyelonephritis, Glomerulonephritis, Polycystic Kidney, Schistosomiasis (Bilharzias) were less common. There were more men than women (63% vs. 37%, respectively). The mean age range of the patients was 42 years old. At study entry, 86 (29%) were dialyzing via native Artery Venous Fistula (AVF) and 11 (4.7%) through a synthetic graft. The Temporary Catheter was the most common form of vascular access used in 272 (81%) patients and AVF the second most frequent (26%). The mortality during this period was 22.9%, being the Cardiovascular Disease the main cause of death (56%), followed by Septicemia (18%). Other causes of death included Pulmonary Infection and Cirrhosis. Hypertension, late referral, smoking and Qats were the commonest co-morbid causes.According to our study we would like to include the habit of chewing Qats as a risk factor to progression of End-Stage Renal Disease (ESRD) in patients with CRF.
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