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51.
52.
Débora Ravelli Carla Romero Matsuoka Regina Célia Della Modesta Thais Maria Ferreira de Souza Vieira Marisa Aparecida Bismara Regitano-d’Arce 《Journal of the American Oil Chemists' Society》2010,87(5):515-520
Measurements of degradation in frying oils are mainly based on physico-chemical properties. Total polar compounds (TPC) and
free fatty acids (FFA) content in frying oils are used as a guide for discarding used oils. The purpose of this study was
to evaluate the efficacy of a sensory method in detecting degradation in soybean oils used in potato chips deep frying. The
sensory evaluation of oil samples was determined by a trained panel; after rigorous selection and training steps. Free fatty
acid, TPC and Rancimat induction period (IP) were quantified in the same samples. The proposed sensory method was sensitive
to small differences in rancidity. The selected and trained sensory panel discarded oil samples with 0.175% FFA as oleic acid,
18.92% TPC, and 0.20 h IP. According to the results achieved in this research sensorial trained panel response is sensitive
and accurate in refusing deteriorated frying oils. Besides this, soybean oil can be used for deep frying procedures and safely
discarded according to the panel response, although presenting up to 7% linolenic acid. 相似文献
53.
54.
Leilane Costa de Conto Marco Antonio Lefevre Gragnani Diogo Maus Hiria Cristina Ifanger Ambiel Ming Chih Chiu Renato Grimaldi Lireny Aparecida Guaraldo Gonçalves 《Journal of the American Oil Chemists' Society》2011,88(11):1709-1714
The aim of this paper was to study the physical–chemical composition of the watermelon seed oil extracted by a mechanical
process using an expeller and by a chemical process using hexane as the solvent. The watermelon seed oil had a high concentration
of unsaturated fatty acids. The two primary sterols were stigmasterol and β-sitosterol, which corresponded to approximately
47 and 30% of the total phytosterols. The oil had a low tocopherol content (65.19 mg/kg for S and 73.19 mg/kg for E). Comparing
the two extraction methods, extraction by expeller produced an oil of superior quality with respect to oxidative stability,
carotenoids and Lovibond color. No significant differences were found between the two extraction methods with respect to the
minor components of the oil considered as functional, such as phytosterols. 相似文献
55.
Shredded Tires and Rubber-Sand as Lightweight Backfill 总被引:4,自引:0,他引:4
The growing interest in utilizing waste materials in civil engineering applications has opened the possibility of constructing reinforced soil structures with unconventional backfills. Scrap tires are a high-profile waste material for which several uses have been studied, including the use of shredded tires as backfill. A triaxial testing program was conducted to investigate the stress-strain relationship and strength of tire chips and a mixture of sand and tire chips. The test results and additional information from the literature were used in the numerical modeling of wall backfills, both unreinforced and reinforced with geosynthetics. The numerical modeling results suggest tire shreds, particularly when mixed with sand, may be effectively used as backfill. 相似文献
56.
M.R.Salgado 《中南工业大学学报(英文版)》2001,8(3):193-196
TheveingraphitedepositsofSriLankahavebeenknowntotheworldsincetheywerefirstputintoproductionin 1 880 .Peakproductionwasmarked ,30 0 0 0tonsperannumduringtheperiodsoflasttwoworldwars .ThenSriLankahadaverygoodreputationforitshighqualitynaturalgraphite .Thisreputat… 相似文献
57.
Evaluation of the physical–chemical properties of aqueous solutions of nonionic surfactants based on polyoxides can be performed by different methods. Depending on the technique used, there can be a significant variation in the critical micelle concentration (CMC) found. This is related to the sensitivity of the technique regarding the unimers and micelles present in the solution as well as the structure of the surfactant evaluated. In this work, the CMC values of aqueous solutions of linear and branched poly(ethylene oxide‐polypropylene oxide) (PEO‐PPO) block copolymers were determined by tensiometry, fluorescence, and particle size analysis, using copolymers having adjacent structures (that is, hydrophilic and hydrophobic segments located adjacently in the copolymer) and alternating structures. Tensiometry was used to measure the surface tension as a function of the copolymer concentration in aqueous solution. Fluorescence was used to determine the fluorescence intensity of pyrene to plot the graphs of the I1/I3 and IE/IM relations according to the surfactant concentration. Finally, particle size analysis was used to determine the diffusion coefficient of the particles. The results showed that the fluorescence and particle size techniques provide lower (and mutually concordant) CMC values and can be considered more precise because these methods directly analyze the bulk of the solution. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
58.
C. Chávez-Méndez. M.A. Salgado–Cervanres H.S. Garcia–Galindo. J.De la Cmz-Medina M.A Garcia-Alvarado 《Drying Technology》2013,31(8-9):2113-2122
ABSTRACT Non-linear regression was used to fit a high order kinetic model to drying curves for mango and cassava. For comparison purposes, the same experimental data were also adjusted by non-lines regression to a model based on exponential series, and to another exponential model by simple linear regression. The high order model fit the experimental data with higher precision (r2 Al.98) than the other exponential series models. The proposed higher order model is mathematically simple as compared to the exponential series, and could be used for simulation of drying processes. 相似文献
59.
Salgado Ana Carolina Duarte Otto Carlos Muniz Bandeira 《Multimedia Tools and Applications》1999,8(3):289-291
Multimedia Tools and Applications - 相似文献
60.
N. K. Salgado M. H. Aliabadi 《Fatigue & Fracture of Engineering Materials & Structures》1997,20(4):583-593
Abstract— A new Dual Boundary Element formulation is presented, which allows for the analysis of mechanically fastened repairs and lap joints. The method requires only the boundaries of the problem to be discretized and the fasteners location is simply defined by a set of internal points.
The technique enables the evaluation of fastener forces, sheet stresses and the stress intensity factors which are important parameters for a Damage Tolerance assessment.
Examples of applications to repair designs and to a lap joint are presented to demonstrate the robustness of the new formulation that is proposed in this paper. 相似文献
The technique enables the evaluation of fastener forces, sheet stresses and the stress intensity factors which are important parameters for a Damage Tolerance assessment.
Examples of applications to repair designs and to a lap joint are presented to demonstrate the robustness of the new formulation that is proposed in this paper. 相似文献