Irregular satellites of Jupiter: capture configurations of binary-asteroids

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A novel voltage step-down/up ZCS-PWM Zeta converter

This paper presents an analysis of a novel pulse-width-modulated (PWM) voltage step-down/up Zeta converter, featuring zero-current-switching (ZCS) at the active switches. The applications in de to de and ac to de (rectifier) operation modes are used as examples to illustrate the performance of this new ZCS-PWM Zeta converter. Regarding to the new ZCS-PWM Zeta rectifier proposed, it should be noticed that the average-current mode control is used in order to obtain a structure with high power-factor (HPF) and low total harmonic distortion (THD) at the input current.Two active switches (main and auxiliary transistors), two diodes, two small resonant inductors and one small resonant capacitor compose the novel ZCS-PWM soft-commutation cell, used in these new ZCS-PWM Zeta converters. In this cell, the turn-on of the active switches occurs in zero-current (ZC) and their turn-off in zero-current and zero-voltage (ZCZV). For the diodes, their turn-on process occurs in zero-voltage (ZV) and their reverse-recovery effects over the active switches are negligible. These characteristics make this cell suitable for Insulated-Gate Bipolar Transistors (IGBTs) applications.The main advantages of these new Zeta converters, generated from the new soft-commutation cell proposed, are possibility of obtaining isolation (through their accumulation inductors), and high efficiency, at wide load range. In addition, for the rectifier application, a high power factor and low THD in the input current ran be obtained, in agreement with LEC 1000-3-2 standards.The principle of operation, the theoretical analysis and a design example for the new de to de Zeta converter operating in voltage step-down mode are presented. Experimental results are obtained from a test unit with 500W output power, 110V(dc) output voltage, 220V(dc) input voltage, operating at 50kHz switching frequency. The efficiency measured at rated toad is equal to 97.3%for this new Zeta converter.Finally, the new Zeta rectifier is analyzed, and experimental results from a test unit rated at 500W output power, 110V(dc) output voltage, 220V(rms) input voltage, and operating at 50kHz switching frequency, are presented. The measured efficiency is equal to 96.95%, the power-factor is equal to 0.98, and the input current THD is equal to 19.07%, for this new rectifier operating at rated load.

Adsorção de Mn (II) e Zn (II) em soluções aquosas usando perlita expandida revestida com quitosana

In this work, chitosan was used as a coating of pure perlite in order to increase the accessibility of the groups OH- e NH2+the adsorptionof ions Mn2+ e Zn2+.The characterization results of the expanded perlite classified as microporous and whose surface area 3,176 m2 g-1after the change resulted in 4,664 m2g-1.From the thermogravimetry(TG) it was found that the percentage of coating was34,3%.The infrared analysis can prove the presence of groups Si-OH, Si-O e Al-O-Siresulting from the perlite and C=O, NH2and OH characterization of chitosan. The experiments on experiments on the adsorption of Mn and Zn were performed in the concentration range of10 a 50 mgL-1and the adsorption capacity inpH 5,8 e 5,2 was 19,49 and 23,09 mgg-1to 25 oC,respectively.The adsorption data were best fitted to Langmuir adsorption model to Langmuir adsorption model for both metalionsisindicative of monolayer adsorption. The kinetics of adsorption were calculated from the equation of Lagergren fitting the model pseudo-second-order for all initial concentrations, suggesting that adsorption of ions Mn2+ and Zn2+ follows the kinetics of pseudo-second-order and whose constant Speedk2(g/mg.min) are 0,105 e 3,98 and capacity and maximum removal qe 4,326 e 3,348,respectively.In this study we used a square wave voltammetry cathodic stripping voltammetry to quantify the adsorbed ions, and the working electrode glassy carbon, reference electrode silver / silver chloride and a platinum auxiliary electrode. The attainment of the peaks corresponding to ions Mn2+ and Zn2+ was evaluated in and electrochemical cell with a capacity of 30 mL using a buffer system (Na2HPO4/NaH2PO4)at pH 4 and was adjusted with solutionsH3PO4 0,1molL-1and NaOH 0,1 molL-1and addition of the analyte has been a cathodic peak in- 0,873 Vand detection limit of2,55x10-6molL-1para Zn.The dough used for obtaining the adsorption isotherm was 150 mg and reached in 120 min time of equilibrium for both metal ions.The maximum adsorption for 120 min with Mn concentration 20 mgL-1 and Zn 10 mgL-1,was91, 09 e 94, 34%, respectively

Aplicação da parafina e do óleo de linhaça como hidrofobizantes da vermiculita, para remoção de derivados de óleo diesel resentes em água produzida sintética

Produced water has lately aroused interest due to their high degree of salinity, suspended oil particles, chemicals added in various manufacturing processes, heavy metals and radioactivity sometimes. Along with oil and due to its high volume production, water production is one of the pollutants of most concern in the process of oil extraction. PAHs due to their ubiquity and their characteristics carcinogenic or mutagenic and teratogenic even have attracted the attention of every scientific society. Formed from the incomplete combustion of organic matter may be natural or anthropogenic. Some materials have been researched with the goal of cleaning up environmental matrices that may be contaminated by hydrocarbons. Among these materials researched various clays have been employed, of which highlights the vermiculite. The family of phyllosilicates, vermiculite for its potential and its high hydrophobic surface area has been a tool widely used in the decontamination of water in processes of oil spills. However, when it loses its capacity expanded hydrophobic having the necessity of using a hidrofobizante to make it organophilic. Among the numerous hidrofobizantes researched and used the linseed oil was the pioneer. In this study sought to evaluate the capacity of removal of PAHs using the vermiculite hydrofobized with linseed oil and wax also, for it was made use of the 24 full factorial design as the main tool for the experiments. We also evaluated the clay grain size (-20 +48 and -48 +80 #), the percentage of hidrofobizante applied (5 and 10%) and salinity of the water produced synthesized in our laboratory (35,000 and 55,000 ppm). The molecular fluorescence spectroscopy due to its sensitivity and speed was used to verify the adsorption capacity of clay, as well as gas chromatography served as an auxiliary technique to identify and quantify the PAHs in solution. In order to characterize the vermiculite was made use of X-ray fluorescence and X-ray diffraction. The infrared and thermogravimetry were essential to note hydrophobization and the amount of coating of clay. According to the fluorescence analysis showed that the test 12 was the best result in about 98% adsorption of fluorescent compounds, however the high salinity, the smallest particle size, the highest percentage of hidrofobizante and the use of linseed oil showed greater efficiency in the removal capacity of these hydrocarbons, in accordance with the trend followed by the analysis of the major factors of the factorial design. To verify the adsorption capacity of clay using a fixed volume of water produced synthetically, used as the test base 12, at their respective levels and factors. Thus, it was observed that after adding about 1 ½ liters of water solution produced synthetically, about 300 times its volume in mass, the vermiculite was able to adsorb 80% of fluorescent species present in solution

Sistema operacional e biblioteca de funções para plataformas MPSOC: um estudo de caso para simuladores de reservatórios

The increasingly request for processing power during last years has pushed integrated circuit industry to look for ways of providing even more processing power with less heat dissipation, power consumption, and chip area. This goal has been achieved increasing the circuit clock, but since there are physical limits of this approach a new solution emerged as the multiprocessor system on chip (MPSoC). This approach demands new tools and basic software infrastructure to take advantage of the inherent parallelism of these architectures. The oil exploration industry has one of its firsts activities the project decision on exploring oil fields, those decisions are aided by reservoir simulations demanding high processing power, the MPSoC may offer greater performance if its parallelism can be well used. This work presents a proposal of a micro-kernel operating system and auxiliary libraries aimed to the STORM MPSoC platform analyzing its influence on the problem of reservoir simulation

Thorax ultrasound in the management of pediatric pneumonias complicated with empyema

The aim of this work is to prospectively study the value of thoracic ultrasound (US) before pleural drainage in children with parapneumonic effusion (PPE). All children hospitalized for PPE, identified by thoracic radiography, underwent US to assess pleural loculation, echogenicity, and pleural fluid quantity. From August 2001 to July 2003, 52 children were examined. US was performed on 48 of these children, of whom 35 received chest tube drainage and 13 only received clinical treatment. US identified 38 patients with free flowing and 10 with loculated pleural fluid. About 25 of the free flowing (65.8%) and 10 (100%) of the loculated patients received chest tube drainage. Echogenicity was anechoic in 13, echoic without septations in 17 and echoic with septations in 18. Chest tube drainage was required in 6 anechoic (46.15%), 14 echoic without septations (82.35%), and 15 echoic with septations (83.33%). Quantity of fluid estimated by US varied from 20 to 860 ml. Effusion volume was higher in patients that were echoic with septations and loculated effusions. Pleural glucose and pH were lower, and LDH was higher in loculated PPE patients. In conclusion, US is an auxiliary exam for determining whether thoracic drainage is needed in parapneumonic effusion; loculated or echoic effusion should be drained, and free anechoic fluid needs further investigation.

Mannheimiose pulmonar experimental em bezerros: swab nasal e nasofaringeano como auxílio diagnóstico

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Segurança e eficácia da técnica de biopsia pulmonar transtorácica percutânea para avaliação histopatológica do parênquima pulmonar de ovinos clinicamente sadios

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Hematological and cerebrospinal fluid changes in cattle naturally and experimentally infected with the bovine herpesvirus 5

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Imuno-histoquímica para o diagnóstico precoce de vitiligo

O vitiligo é uma doença de pele freqüente que acomete 1% da população e é caracterizada por máculas despigmentadas conseqüentes à perda progressiva e localizada dos melanócitos da epiderme. Na maioria dos pacientes, o diagnóstico é feito por exame clínico. A biópsia da pele é realizada quando há necessidade de diagnóstico diferencial com doenças hipocromiantes. O diagnóstico histopatológico de vitiligo é difícil nos preparados corados por hematoxilina e eosina (HE). Há poucos estudos sobre a melhoria da qualidade diagnóstica no vitiligo. OBJETIVO: Avaliar a utilidade dos marcadores imuno-histoquímicos proteína S-100, human melanoma black-45 (HMB-45) e Melan-A para o diagnóstico precoce em casos clinicamente suspeitos ou duvidosos de vitiligo. Material e métodos: Lâminas histológicas de biópsias de pele sã e lesada de 10 pacientes com suspeita clínica de vitiligo coradas pelos métodos de HE, proteína S-100, HMB-45 e Melan-A. Utilizou-se contracoloração com Giemsa como modificação técnica para diferenciar a melanina da imunomarcação. RESULTADOS: Seis casos, com manifestação clínica recente, apresentaram infiltrado linfocitário, do tipo dermatite de interface, na pele lesada na HE. As colorações por S-100, HMB-45 e Melan-A marcaram os melanócitos da camada basal da pele sã, e a proteína S-100 evidenciou as células de Langerhans. Na pele lesada, os melanócitos estavam ausentes ou diminuídos quando comparados com a pele normal. A proteína S-100 demonstrou maior número de células de Langerhans, o que é característico das lesões de vitiligo. CONCLUSÃO: A imuno-histoquímica pode ser utilizada como método auxiliar no diagnóstico dos casos duvidosos de vitiligo.

Extração da fécula retida no resíduo fibroso do processo de produção de fécula de mandioca

A melhoria do processo de extração da fécula de mandioca é um problema bastante discutido entre industriais e pesquisadores. Atualmente, para cada tonelada de raiz de mandioca processada obtêm-se por volta de 250kg de fécula e perde-se no resíduo fibroso cerca de 140kg de fécula que não foi extraída no processamento. Neste trabalho objetivou-se analisar o efeito de uma segunda extração em paralelo e o uso de soluções auxiliares na extração da fécula retida no resíduo fibroso (farelo), visando a melhoria no rendimento industrial. Foram avaliados quatro tratamentos utilizando-se: água (T1), solução de NaOH 0,2% (T2), solução água-álcool 10%v/v (T3) e solução água- Tween 80 0,002% (T4). A partir dos resultados obtidos foi possível concluir que a adição de soluções auxiliares não promoveu diferença significativa (p< 0,05) de extração em relação à água (T1), e que uma nova extração da fécula retida no farelo possibilitaria uma redução de cerca de 20% no teor de amido do farelo, o qual não é extraído no processo convencional.

Geoprocessamento de dados meteo-oceonográficos (cor do oceano e temperatura da superfície do mar) aplicado ao monitoramento ambiental na costa setentrional do Rio Grande do Norte

Orbital remote sensing has been used as a beneficial tool in improving the knowledge on oceanographic and hydrodynamic aspects in northern portion of the continental shelf of Rio Grande do Norte, offshore Potiguar Basin. Aspects such as geography, temporal and spatial resolution combined with a consistent methodology and provide a substantial economic advantage compared to traditional methods of in situ data collecting. Images of the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor onboard NASA's AQUA satellite were obtained to support systematic data collections related to the campaign of environmental monitoring and characterization of Potiguar Basin, held in May 2004. Images of Total Suspension Matter (TSM) and values of radiance standard were generated for the calculation of concentrations of total suspension matter (TSM), chlorophyll-a and sea surface temperature (SST). These data sets were used for statistical comparisons between measures in situ and satellite estimates looking validate algorithms or develop a comprehensive regional approach empirically. AQUA-MODIS images allowed the simultaneous comparison of two-dimensional water quality (total suspension matter), phytoplankton biomass (chlorophyll-a) variability and physical (temperature). For images of total suspension matter, the generated models showed a good correlation with the field data, allowing quantitative and qualitative analysis. The images of chlorophyll-a showed a consistent correlation with the in situ values of concentration. The algorithms adjusted for these images obtained a correlation coefficient fairly well with the data field in order that the sensor can be having an effect throughout the water column and not just the surface. This has led to a fit between the data of chlorophyll-the integration of the average sampling interval of the entire water column up to the level of the first optical depth, with the data generated from the images. This method resulted in higher values of chlorophyll concentration to greater depths, due to the fact that we are integrating more values of chlorophyll in the water column. Thus we can represent the biomass available in the water column. Images SST and SST measures in situ showed a mean difference DT (SST insitu - SST sat) around -0.14 ° C, considered low, making the results very good. The integration of total suspension matter, chlorophyll-a, the temperature of the sea surface (SST) and auxiliary data enabled the recognition of some of the main ways to fund the continental shelf. The main features highlighted were submerged canyons of rivers Apodi and Açu, some of the lines and beachrocks reefs, structural highs and the continental shelf break which occurs at depths around -60 m. The results confirmed the high potential for use of the AQUA-MODIS images to environmental monitoring of sea areas due to ease of detection of the field two-dimensional material in suspension on the sea surface, temperature and the concentration of chlorophyll-a

Estudo bibliográfico de publicações sobre a atividade administrativa da enfermagem em saúde mental

0bjetivando estudar a atividade administrativa do enfermeiro em saúde mental enquanto um instrumento do processo de trabalho, realizamos um estudo bibliográfico de publicações de enfermagem sobre esta temática no período de 1988 a 1997. Através da leitura e análise crítica de 8 artigos e 19 dissertações e teses selecionadas, identificamos as principais características dessa prática, quais sejam: os enfermeiros são os responsáveis pela equipe e assistência de enfermagem, obedecendo à lógica determinada pela instituição; suas ações não são planejadas, coordenadas e avaliadas; as atividades administrativas utilizam a maior parte de seu tempo de trabalho e o cuidado direto de enfermagem é realizado pela equipe auxiliar de enfermagem, sendo que nos serviços extra--hospitalares os atendimentos diretos e grupais são mais freqüentes.

Gerenciamento ambiental das fazendas de camarão do Rio Grande do Norte

The present dissertação had as objective to study the ambient management in the Farms Saint Rita, Tahim Agropesca and Agropesca Rigomoleiro, in the Great River of the North. For this we use as theoretical tool some fundantes concepts of geographic science, the space, and as concepts auxiliary of ambient management, of estuaries as the half natural one and of manguezais as ecosystem. The study if it gave taking in consideration a model of flow of activities of a typical farm following the way of the residues produced since the beginning until its final destination, in a suitable script of SCHERER (1999). The considered flow established a sequence activities where it is identified the material of entrance, the process of management, the residues of exit and the destination of the residues to the long one of the phase of culture of the shrimp. From it was there had been elaborated a series of managemental pictures with the data raised in the three farms, of different transports and concludes that the ambient management of these farms does not follow the formal standards of a system of typical ambient management. Collating with the system of considered by norm ISO14000 the study it disclosed that all the companies are in a situation of not conformity and that the impacts on the environment continue being many significant ones. However, it is possible to implant norm ISO14000 because some procedures implanted for the farms are correct of the point of view of the ambient management

Evaluation of Glycemic and Lipid Profile of Offspring of Diabetic Wistar Rats Treated with Malpighia emarginata Juice

Knowing that maternal diabetes is related to hyperglycemia and fetal hyperinsulinemia, which affect the lipid metabolism, the aim of this study was to evaluate the effects of Malpighia emarginata (acerola) juice on the glycemic and lipid profile of offspring of diabetic and nondiabetic Wistar rats. The adult offspring of non-diabetic dams and of dams with severe streptozotocin-induced diabetes were divided into groups: G1, offspring (of control dams) treated with water, G2, offspring (of diabetic dams) treated with water, G3, male offspring (of control dams) treated with acerola juice, and G4, male offspring (of diabetic dams) treated with acerola juice. The offspring of diabetic dams treated with acerola juice showed significantly decreased levels of glucose, cholesterol, triglycerides, and increased HDL-c. The use of acerola juice is a potential strategy to aid in the prevention of DM and dyslipidemia and its complications or to act as an auxiliary in the treatment of these diseases.