OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Mansur” ,找到相关结果约461条。
Performance of Heat Pipe Utilized for Atmospheric Air Heating  [PDF]
Mohammed Mansur
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.38125

The objective of the present experimental work is to investigate the performance of a wrapped screen heat pipe for atmospheric air heating to compare with the limits of this pipe. The experiment was conducted using copper pipe material and acetone as working fluid at different vapor temperatures. The testing also consists of a heater, a blower for heat removal (condenser), temperature measuring device, a vapor temperature probe, acetone charging system, and a vacuum pump. The copper outside diameterof the pipe is 0.022 m, with a total length of 0.6 m. The results showed that the pipe wall temperature (Tw) for a wrapped screen heat pipe has a rapid increase and takes 50 min to reach steady state at (Q = 63 W). The vapour temperature of working fluid increases as the heat load increases at constant air velocity. It was also been found that the range of vapour temperature deceases as the filling ratio increases that means the increasing of the filling ratio results the decrease of the maximum vapour temperature and the variation in the vapour temperature. The best recorded filling ratio is 0.6 which has the lowest vapour temperature at highest heat load. The maximum heat transport limit for this pipe is 80 W and the maximum temperature difference for air is 5C.

Brazil World Cup Challenges
Salesian Journal on Information Systems , 2012,
Abstract: Overcoming the productivity challenge is the main benefit of the 2014 World Cup for Brazilian people. The sustainable development of our cultural tourism industry will catapult the new middle class growing up rate.
Social Production of Chemistry Textbooks in Brazil, 1810 - 1941 [Produ o Social de Livros Escolares de Química no Brasil, de 1810 a 1941]
Mansur Lutfi
Revista Virtual de Química , 2012,
Abstract: This is an exhaustive survey of chemistry textbooks written in Brazilian Portuguese, since the deployment of Imprensa Régia in 1810 until 1941. The article put into historical context the books and their authors, by linking them with their publishers, school curriculum and educational legislation through each historical period.
Perspectives on Drug Addiction in Islamic History and Theology
Mansur Ali
Religions , 2014, DOI: 10.3390/rel5030912
Abstract: How does Islam view substance addiction? What happens to the soul of the person suffering from addictive disorder? What happens to his relationship with God? These are some of the questions that this article tries to answer. Three models on drug addiction from an Islamic theological perspective will be explored here. Two of them are preventative models based on an understanding of society rooted in shame-culture, while the third model, called Millati Islami, practiced in the USA, is founded on the Islamic understanding of tawba (repentance). Furthermore, drugs and addiction in scripture, as well as medieval Muslims society’s attitude towards them are explored. As a whole, the models discussed in the article demonstrate that Islamic theology possesses the intellectual and theoretical tools to develop fully-fledged theological models of addiction, and a suggestion to explore one model is made in the conclusion.
Effect of the Preparation Method on Co/Al2O3 Catalyst Applied to Ethanol Steam Reforming Reaction Production of Hydrogen  [PDF]
Silmara Rodrigues Garcia, José Mansur Assaf
Modern Research in Catalysis (MRC) , 2012, DOI: 10.4236/mrc.2012.13007
Abstract: Alumina supported cobalt catalysts were prepared, characterized and applied in ethanol steam reforming for hydrogen production. The support and the supported catalysts were prepared, respectively, by the solvothermal and precipitation, impregnation and deposition-precipitation methods. The cobalt was added by impregnation and deposition-precipitation in the Al2O3 supports using a Co(NO3)2·6H2O solution. The solids were characterized, Temperature-Programmed Re-duction with H2 (RTP-H2), X-Ray Diffraction (DRX), BET Nitrogen Adsorption and Temperature Programmed Oxida-tion (TPO). The results indicated that the preparation method and the treatment conditions of samples were appropriate for obtaining the wanted compounds. Co3O4 phase was verified for all catalysts through analyses of DRX and RTP-H2 results. Catalytic tests were performed by varying the temperature from 450?C to 600?C, with water: ethanol molar ratio of 3:1. The ethanol conversion was superior of 99%, with greater hydrogen yield at 600℃. The lower carbon deposition was observed in catalysts prepared with solvothermal/deposition-precipitation methods at 450℃.
Aprimoramentos no transplante de cabelo com laser de CO2 : apresenta o de três casos clínicos
Mansur Cristina,Mansur Leonora,Mansur Jo?o,Feital Maria Teresa
Anais Brasileiros de Dermatologia , 2004,
Abstract: Os autores apresentam três casos de transplante de cabelo em que foram feitas incis es receptoras mistas: orifício com vaporiza o com laser de CO2 nos quais se adicionou uma incis o lateral a frio. Essa incis o lateral facilita a introdu o dos microenxertos por permitir a saída do ar e melhora sua fixa o por conferir elasticidade ao orifício. Os pacientes foram previamente betabloqueados para evitar o efeito beta da adrenalina.
Characterization and Accelerated Ageing of UHMWPE Used in Orthopedic Prosthesis by Peroxide
Magda Rocha,Alexandra Mansur,Herman Mansur
Materials , 2009, DOI: 10.3390/ma2020562
Abstract: Ultra-high molecular weight polyethylene (UHMWPE) has been the most commonly used bearing material in total joint arthroplasty. Wear and oxidation fatigue resistance of UHMWPE are regarded as two important mechanical properties to extend the longevity of knee prostheses. Though accelerated in vitro protocols have been developed to test the relative oxidation resistance of various types of UHMWPE, its mechanism is not accurately understood yet. Thus, in the present study an accelerated ageing of UHMWPE in hydrogen peroxide solution was performed and relative oxidation was extensively characterized by Fourier Transformed Infrared Spectroscopy (FTIR) spectroscopy and the morphological changes were analyzed by Scanning Electron Microscopy (SEM). Different chemical groups of UHMWPE associated with the degradation reaction were monitored for over 120 days in order to evaluate the possible oxidation mechanism(s) which may have occurred. The results have provided strong evidence that the oxidation mechanism is rather complex, and two stages with their own particular first-order kinetics reaction patterns have been clearly identified. Furthermore, hydrogen peroxide has proven to be an efficient oxidative medium to accelerate ageing of UHMWPE.
Enzyme-Polymers Conjugated to Quantum-Dots for Sensing Applications
Alexandra Mansur,Herman Mansur,Juan González
Sensors , 2011, DOI: 10.3390/s111009951
Abstract: In the present research, the concept of developing a novel system based on polymer-enzyme macromolecules was tested by coupling carboxylic acid functionalized poly(vinyl alcohol) (PVA-COOH) to glucose oxidase (GOx) followed by the bioconjugation with CdS quantum-dots (QD). The resulting organic-inorganic nanohybrids were characterized by UV-visible spectroscopy, infrared spectroscopy, Photoluminescence spectroscopy (PL) and transmission electron microscopy (TEM). The spectroscopy results have clearly shown that the polymer-enzyme macromolecules (PVA-COOH/GOx) were synthesized by the proposed zero-length linker route. Moreover, they have performed as successful capping agents for the nucleation and constrained growth of CdS quantum-dots via aqueous colloidal chemistry. The TEM images associated with the optical absorption results have indicated the formation of CdS nanocrystals with estimated diameters of about 3.0 nm. The “blue-shift” in the visible absorption spectra and the PL values have provided strong evidence that the fluorescent CdS nanoparticles were produced in the quantum-size confinement regime. Finally, the hybrid system was biochemically assayed by injecting the glucose substrate and detecting the formation of peroxide with the enzyme horseradish peroxidase (HRP). Thus, the polymer-enzyme-QD hybrid has behaved as a nanostructured sensor for glucose detecting.
Eggplant (Solanum melongena L.): tissue culture, genetic transformation and use as an alternative model plant
Magioli, Claudia;Mansur, Elisabeth;
Acta Botanica Brasilica , 2005, DOI: 10.1590/S0102-33062005000100013
Abstract: eggplant is an agronomically important non-tuberous solanaceous crop grown primarily for its large oval fruit. in popular medicine, eggplant is indicated for the treatment of several diseases, including diabetes, arthritis, asthma and bronchitis. eggplant is susceptible to a number of diseases and pests capable of causing serious crop losses. this problem has been addressed by hybridizing eggplant with wild resistant solanum species, which present a wide genetic diversity and are source of useful agronomic traits. the application of in vitro methodologies to eggplant has resulted in considerable success. eggplant tissues present a high morphogenetic potential that is useful for developmental studies as well as for establishing biotechnological approaches to produce improved varieties, such as embryo rescue, in vitro selection, somatic hybridization and genetic transformation. taken together, these characteristics also make eggplant a complete model for studies on different areas of plant science, including control of gene expression and assessment of genetic stability of somaclones derived from different morphogenetic processes. in the present study, important factors that affect the efficiency of in vitro regeneration through organogenesis and embryogenesis as well as genetic transformation are analyzed. the potential of this species as a model plant for studying various aspects of plant genetics and physiology is also discussed.
A indústria de processamento químico no Brasil: suas motiva??es para pesquisa e desenvolvimento e suas interfaces com as políticas governamentais
Mansur, Alberto Ramy;
Química Nova , 2005, DOI: 10.1590/S0100-40422005000700020
Abstract: as the chemical science is an experimental one a chemical industry require technical people in all its staff level: from directors and managers to operators. this chemical and chemical engineering based education is the foundation of the innovate process and motivation. the paper discusses this and the role of public policies to improve the r&d and innovation in the brazilian chemical industry.

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