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Search Results: 1 - 10 of 330209 matches for " L. H. HECKTHEUER "
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USO DE SUBPRODUTOS AGROINDUSTRIAIS NO DESENVOLVIMENTO DE MACARR O NUTRICIONALMENTE MELHORADO
A. M. NICOLETTI,L. P. SILVA,L. H. HECKTHEUER,G. S. P. TOLEDO
Alimentos e Nutri??o , 2008,
Abstract: O presente trabalho teve como objetivo desenvolver uma formula § £o de macarr £o nutricionalmente melhorado. Tal produto foi escolhido para o desenvolvimento deste estudo por ser um alimento popular, amplamente consumido e barato; por m, de caracter -stica prioritariamente energ tica, com defici ancias no teor e qualidade prot icas. Para corrigir estas defici ancias foram usados, como ingredientes majorit rios, a quirera de arroz e o farelo de soja, que s £o subprodutos agroindustriais de baixo custo e abundantemente produzidos no Pa -s. A formula § £o desenvolvida apresentou teor de prote -na 34,5% superior ao macarr £o convencional, bem como teor de fibra e minerais totais 2,6 e 1,9 vezes superiores, respectivamente, por m, sem alterar significativamente os valores energ ticos. Houve uma complementa § £o do padr £o aminoac -dico desta formula § £o, suprindo as recomenda § μes da FAO/WHO/ UNU tanto para crian §as como para adultos. Os resultados da an lise sensorial mostraram valores de aceitabilidade acima de 80% do macarr £o nutricionalmente melhorado, para ambos os p oblicos.
Methodology for Photovoltaic Modules Characterization and Shading Effects Analysis
Hecktheuer, L. A.;Krenzinger, A.;Prieb, C. W. M.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000100004
Abstract: this work describes the methodology, basic procedures and instrumental employed by the solar energy laboratory at universidade federal do rio grande do sul for the determination of current-voltage characteristic curves of photovoltaic modules. according to this methodology, i-v characteristic curves were acquired for several modules under diverse conditions. the main electrical parameters were determined and the temperature and irradiance influence on photovoltaic modules performance was quantified. it was observed that most of the tested modules presented output power values considerably lower than those specified by the manufacturers. the described hardware allows the testing of modules with open-circuit voltage up to 50 v and short-circuit current up to 8 a.
Methodology for Photovoltaic Modules Characterization and Shading Effects Analysis
Hecktheuer L. A.,Krenzinger A.,Prieb C. W. M.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: This work describes the methodology, basic procedures and instrumental employed by the Solar Energy Laboratory at Universidade Federal do Rio Grande do Sul for the determination of current-voltage characteristic curves of photovoltaic modules. According to this methodology, I-V characteristic curves were acquired for several modules under diverse conditions. The main electrical parameters were determined and the temperature and irradiance influence on photovoltaic modules performance was quantified. It was observed that most of the tested modules presented output power values considerably lower than those specified by the manufacturers. The described hardware allows the testing of modules with open-circuit voltage up to 50 V and short-circuit current up to 8 A.
Determina??o de resveratrol em sucos de uva no Brasil
Sautter, Cláudia K.;Denardin, Sandra;Alves, Audrei O.;Mallmann, Carlos A.;Penna, Neidi G.;Hecktheuer, Luisa H.;
Ciência e Tecnologia de Alimentos , 2005, DOI: 10.1590/S0101-20612005000300008
Abstract: the resveratrol detection in wines has been studied more intensely in the last years. the isomeric trans-resveratrol has recognized biological activities, and some of them are therapeutic, such as anti-inflammatory action, enzyme lipoxigenase inhibition and anti-carcinogenic action in vitro. the presence of resveratrol (4,3',5'-trihydroxystilbene), trans and cis isomers, was investigated in industrial grape juices produced in brazil. additionally, total phenols, acidity, reducing sugars, soluble solids and specific gravity of samples were determined in accordance with law. resveratrol was determined by high performance liquid chromatography by souto et al. [23], adapted to the temperature of 50°c. trans and cis-resveratrol were found in all the juices analyzed, tran-resveratrol in the concentration range of 0.19 to 0.90mg.l-1 and cis-resveratrol in the concentration range of 0.07 to 1.59mg.l-1.
Desenvolvimento e valida??o de um método analítico para a determina??o de histamina em vinhos utilizando cromatografia líquida de alta eficiência com detec??o por fluorescência
Prestes, Osmar D.;Presta, Michele A.;Kolberg, Diana I. S.;Zanella, Renato;Rossato, Simone B.;Penna, Neidi G.;Hecktheuer, Luisa H. R.;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000100004
Abstract: a rapid and efficient method for the analysis of histamine in wines using hplc with fluorescence detection after derivatization was developed and validated. the method lod and loq values were 0.25 and 0.50 mg l-1 respectively. the repeatability and intermediary precision for the instrument and for the method presented rsd values of 3.7 and 2.9%, and 6.0 and 5.6%, respectively. the recoveries were 95.5 and 89.9% for the fortification levels of 2 and 10 mg l-1. the method was applied to determine the histamine content in cabernet sauvignon wines, which presented values between 1.2 and 5.7 mg l-1.
Efeito do armazenamento à baixa temperatura (-4 oC) na cor e no teor de acidez da farinha de trigo
Ortolan, Fernanda;Hecktheuer, Luisa Helena;Miranda, Martha Zavariz de;
Ciência e Tecnologia de Alimentos , 2010, DOI: 10.1590/S0101-20612010005000009
Abstract: during wheat flour storage, biochemical changes can occur which lead to nutritional and technological alterations, but in low temperature these changes can occur more slowly. among the reactions, we may note are an increase in acidity, reduction of ph and modifications to its color. the present work aimed to evaluate the effects of storage at low temperature (-4 oc) on the color and acidity of wheat flour over six months and to correlate the results obtained to discover whether the acidity has any relationship with the color of the flour. flours of ten wheat genotypes, cultivated in cascavel, in paraná state were used. the color was determined via the ciel*a*b* system using the color parameters: l * (brightness), a* and b * (chromaticity coordinates). the aoac procedure for lipid acidity was used. the flours displayed a tendency to discoloration during the six-month storage period, with the occurrence of a slight increase in acidity, but with acceptable content. the acidity was not considered to be a factor involved in the alteration of the flour color in the storage at low temperature, because no correlation between these two parameters was observed.
Projetos Sociais Esportivos: Vulnerabiliza o e Governo
Luiz Felipe Alcantara Hecktheuer,Méri Rosane Santos da Silva
Movimento , 2011,
Abstract: Este texto analiza los proyectos sociales y deportivos en funcionamiento en la ciudad de Rio Grande-RS. Partiendo de interrogaciones sobre el "social" de estos proyectos, son abordadas algunas de sus dimensiones como: la responsabilidad de la sociedad y del individuo, las posibilidades de intervención en educación no formal, y el proceso de segmentación de una población de individuos nombrados como vulnerables - "vulnerablización". Tales dimensiones, en este estudio, constituyen estos proyectos sociales como estrategias y tecnologías de gobiernamento de estas poblaciones.
Housing Choice in an Affluent Shanghai – Decision Process of Middle Class Shanghai Residents  [PDF]
L. H. Li
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.21002
Abstract: While most papers on housing choice concentrate on relatively disadvantaged groups in the society con-strained by financial ability, this paper looks at the affluent population in Shanghai. In examining their own perception of the relative importance of difference factors affecting such choice by way of an Analytical Hi-erarchy Process, we are able to understand that currently, most affluent households still regard proximity to the city centre as an important factor when making housing choice. More importantly, there seems to be a marked difference in the ranking of these factors between the upper middle class and the average middle class in this city. Our analysis shows that the upper middle class households place more importance on the transportation network and neighbourhood infrastructure, while the average middle class have more concern on the housing attributes.
Symmetric Identities from an Invariant in Partition Conjugation and Their Applications in q-Series  [PDF]
Sandy H. L. Chen
Open Journal of Discrete Mathematics (OJDM) , 2014, DOI: 10.4236/ojdm.2014.42006
Abstract:

For every partition \"\" and its conjugation \"\", there is an important invariant \"\" \"\", which denotes the number of different parts. That is \"\", . We will derive a series of symmetric q-identities from the invariant in partition conjugation by studying modified Durfee rectangles. The extensive applications of the several symmetric q-identities in q-series  [1] will also be discussed. Without too much effort one can obtain much well-known knowledge as well as new formulas by proper substitutions and elementary calculations, such as symmetric identities, mock theta functions, a two-variable reciprocity theorem, identities from Ramanujan’s Lost Notebook and so on.

Change of Spectroscopic Properties of PU/PVC Doped by Single Walled Carbon Nanotubes  [PDF]
L. H. Gaabour
Optics and Photonics Journal (OPJ) , 2016, DOI: 10.4236/opj.2016.612031
Abstract:

Nanocomposite films based on polyurethane and polyvinyl chloride (PU/PVC) doped by low content (≤0.045 wt%) of single wall carbon nanotubes (SWCNTs) were prepared and characterized. The structural, optical, thermal and mechanical properties of the prepared nanocomposites were characterized by various tools. The IR band at 3437 cm-1 in SWCNTs vanishing for doped samples signified that SWCNTs were successfully covalently encapsulated with PU/PVC. The X-ray peaks broaden with reduced intensity which refers to a reduction of the crystallinity for the blend after increase of SWCNTs attributed to changing in the crosslink density. UV/Vis analysis reveals that the optical band gap values were decreased with increased SWCNT attributed to the formation of defects in polymeric matrix with increase in the degree of disorder in the films. These defects produce the localized states in the optical band gap. All results data showed well dispersion of SWCNTs in polymer matrix at all weight percentages and an interaction between SWCNTs and the blend occurred. The thermal analysis showed that the melting point (Tm) and degradation temperature (Td) of the obtained films were increased gradually with adding of SWCNTs. Furthermore, the thermal stability was improved after adding SWCNTs into the PU/PVC polymer blend.

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