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Search Results: 1 - 10 of 190870 matches for " Berry Nara G. "
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Efeito da presen?a de defeitos no comportamento mecanico de juntas coladas carbono-epoxi
Berry, Nara G.;d'Almeida, José Roberto M.;
Polímeros , 2000, DOI: 10.1590/S0104-14282000000300010
Abstract: nowadays, bonded joints are been widely used to replace mechanically joined parts. the influence of defects on the mechanical behavior of these joints must be determined if their reliability is to be ascertained. in this work, the mechanical behavior of single lap joints was evaluated as a function of the presence and size of defects on the bonded area. the results obtained indicate that the models developed for determining the strength of flawless single lap joints can be employed to model the behavior of single lap joints with defects.
Efeito da presen a de defeitos no comportamento mecanico de juntas coladas carbono-epoxi
Berry Nara G.,d'Almeida José Roberto M.
Polímeros , 2000,
Abstract: Juntas unidas por ades o vêm sendo largamente empregadas em substitui o a pe as unidas por métodos convencionais de fixa o mecanica. A confiabilidade destas juntas deve considerar o efeito da presen a de defeitos na área colada sobre o comportamento mecanico da pe a. Neste trabalho analisou-se o comportamento mecanico de juntas sobrepostas simples em fun o da presen a de defeitos. Foi verificado, também, a adequa o para as juntas com defeitos dos principais modelos teóricos desenvolvidos para juntas sem defeitos.
Hop and HipHop : Multitier Web Orchestration
Gérard Berry,Manuel Serrano
Computer Science , 2013,
Abstract: Rich applications merge classical computing, client-server concurrency, web-based interfaces, and the complex time- and event-based reactive programming found in embedded systems. To handle them, we extend the Hop web programming platform by HipHop, a domain-specific language dedicated to event-based process orchestration. Borrowing the synchronous reactive model of Esterel, HipHop is based on synchronous concurrency and preemption primitives that are known to be key components for the modular design of complex reactive behaviors. HipHop departs from Esterel by its ability to handle the dynamicity of Web applications, thanks to the reflexivity of Hop. Using a music player example, we show how to modularly build a non-trivial Hop application using HipHop orchestration code.
Laser gas-discharge absorption measurements of the ratio of two transition rates in argon
I. M. Savukov,H. G. Berry
Physics , 2002, DOI: 10.1103/PhysRevA.67.032505
Abstract: The ratio of two line strengths at 922.7 nm and 978.7 nm of argon is measured in an argon pulsed discharge with the use of a single-mode Ti:Sapphire laser. The result 3.29(0.13) is in agreement with our theoretical prediction 3.23 and with a less accurate ratio 2.89(0.43) from the NIST database.
Comparative Statics On The Allocation Of Spectrum
Vijay G. Subramanian,Mike Honig,Randy Berry
Computer Science , 2013,
Abstract: Allocation of spectrum is an important policy issue and decisions taken have ramifications for future growth of wireless communications and achieving universal connectivity. In this paper, on a common footing we compare the social welfare obtained from the allocation of new spectrum under different alternatives: to licensed providers in monopolistic, oligopolistic and perfectly competitive settings, and for unlicensed access. For this purpose we use mathematical models of competition in congestible resources. Initially we assume that any new bandwidth is available for free, but we also generalize our results to include investment decisions when prices are charged for bandwidth acquisition.
Roughness Control of Layer-by-Layer and Alternative Spray Films from Congo Red and PAH via Laser Light Irradiation  [PDF]
Gleidson Cardoso, Romário J. da Silva, Rafael R. G. Maciel, Nara C. de Souza, Josmary R. Silva
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.38078
Abstract: Films from congo red (CR) alternated with poly(allylamine hydrochloride), PAH, were prepared by layer-by-layer and alternative spray techniques. In order to investigate the change of roughness induced by laser light irradiation (532 nm), both kinds of films were characterized by using UV-visible spectroscopy and atomic force microscopy (AFM). At dif- ferent irradiation times, layer-by-layer, LbL, films showed small changes in the roughness and irregular behavior, whereas spray films exhibited higher and a regular decreasing of roughness with increasing irradiation time. The higher roughness of spray films as compared with the LbL ones was attributed to different formation mechanisms of the films. The decreasing of the roughness as a function of the irradiation time (exhibited by the spray films) was associated to surface relaxation due to the interplay between photoisomerization of congo red dye and the heating of the sample during the laser light irradiation. The results suggested that the alternative spray technique is the best choose to control of roughness of the films by using light irradiation.
Method of Power Generation after Hydrogen is Produced with Piggery Wastewater  [PDF]
Matsunori Nara, Xiaoyi Zhao
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B013
Abstract:

It is a technology that produces the hydrogen gases by using only the microorganism and sunlight from the wastewater to be at a loss because of processing. And, the produced hydrogen uses the fuel cell and is used to generate electricity. Because this technology doesn't use the organic matter that becomes food, and use the organic matter included in waste, clean power generation is possible. We researched the improvement of the hydrogen gas production efficiency. The purple non-sulfur photosynthesis bacillus was purely cultured, the substrate dependency was clarified, and the best substrate dosage was decided. Moreover, it was shown that the light wave length conversion net was effective for the hydrogen gas production efficiency improvement. On the other hand, a too strong light intensity showed becoming the growth obstruction of phototropic bacteria. When the light intensity for the photosynthesis is insufficient, the light wave length conversion net can support this. On the other hand, there was an effect of easing the trouble by light when the light intensity was excessive. We were able to offer the design parameter to produce the hydrogen gases with the wastewater efficiently.

Geological Control upon Groundwater Flow and Major Ion Chemistry with Influence on Basin Management in a Coastal Aquifer, South Australia  [PDF]
Nara Somaratne, Jacqueline Frizenschaf
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.512124
Abstract:

Estimation of natural recharge and potential for seawater intrusion are critical considerations for management of coastal freshwater aquifers. We show hydrochemical signatures of groundwater to identify the influence of geological control on chemical processes in a coastal groundwater system. We used dominant hydrochemical facies, salinity and magnesium ions to determine two main groundwater flow paths with different origins and ages. Mixing of groundwater with different origins and ages results in unreliable recharge estimates using chlorofluorocarbon (CFC) and chloride mass balance (CMB) methods, thus limiting available methods for recharge assessment. Interpretation of hydrochemical data suggests that calcium carbonate dissolution, ion exchange processes and mixing with sea aerosol in coastal zones are the main influencing factors on groundwater chemistry. Restricted groundwater flows due to occurrence of a basement high at the southern side of the basin boundary influence the distance to the toe of the saline wedge. Thus, knowledge of geological control over groundwater systems forms an important part of characterising basins and contributes toward effective management of groundwater resources.

Initial Academic Literacies/EAP/Genre Practices: Towards Horizontal and Participatory Online-Offline Learning in a Changing World  [PDF]
Nara Hiroko Takaki
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.210005
Abstract: This article argues in favor of extended possibilities for under-graduate students’ initial development of academic literacies/EAP/genre practices. The description of a particular learner’s initiative and its consequences constitutes the focus of the paper, which is the result of a research project in a specific context of higher education in Brazil. Qualitative and interpretive aspects characterize the methodology adopted for this investigation for the researcher and the participants’ perspectives are considered. It also assumes academic literacy/EAP/genre as situated social practices. The learning theories support the use of Facebook in English language instruction. Portability and multitasking, opportunity to structure learning on personal time and schedule, space for critical authorship and multimodal tasks in collaborative fashion suggest the inseparability between non-dominant forma of literacies and conventional academic literacy/EAP/genre studies.
Cyanobacterial Toxins as Allelochemicals with Potential Applications as Algaecides, Herbicides and Insecticides
John P. Berry,Miroslav Gantar,Mario H. Perez,Gerald Berry,Fernando G. Noriega
Marine Drugs , 2008, DOI: 10.3390/md6020117
Abstract: Cyanobacteria (“blue-green algae”) from marine and freshwater habitats are known to produce a diverse array of toxic or otherwise bioactive metabolites. However, the functional role of the vast majority of these compounds, particularly in terms of the physiology and ecology of the cyanobacteria that produce them, remains largely unknown. A limited number of studies have suggested that some of the compounds may have ecological roles as allelochemicals, specifically including compounds that may inhibit competing sympatric macrophytes, algae and microbes. These allelochemicals may also play a role in defense against potential predators and grazers, particularly aquatic invertebrates and their larvae. This review will discuss the existing evidence for the allelochemical roles of cyanobacterial toxins, as well as the potential for development and application of these compounds as algaecides, herbicides and insecticides, and specifically present relevant results from investigations into toxins of cyanobacteria from the Florida Everglades and associated waterways.
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