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排序方式: 共有50条查询结果,搜索用时 31 毫秒
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Kamenan Koffi A. Jagadeesh Anooja Kre N’guessan Raymond Assanvo Edja Florentin Soman Suraj Unni K. N. Narayanan 《Journal of Materials Science: Materials in Electronics》2021,32(11):14207-14216
Journal of Materials Science: Materials in Electronics - We successfully fabricated dye sensitized solar cells (DSSCs) employing a quasi-solid state electrolyte based on pristine insulator natural... 相似文献
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Tagro S. Guehi Adjéhi T. Dadie Kouadio P. B. Koffi Soumaïla Dabonne Louis Ban‐Koffi Kra D. Kedjebo Gnopo J. Nemlin 《International Journal of Food Science & Technology》2010,45(12):2508-2514
This study aims to compare the effect of three cocoa fermentation methods and their duration on raw cocoa quality. Results showed a decrease in percentage of physical quality defects on fermentation method. Cocoa fermented for 4 days presented higher percentage of purple beans reached 45% and about 10% of slaty beans than cocoa fermented for 6 days whatever the process. Fermentation duration did not influence the mouldy beans that were around 1%. Formation of brown beans increased from 16% to 50% depending on the fermentation duration and process. Using wooden boxes allowed higher percentage of 77%–90% brown beans than others materials. Acidity of cocoa decreased on fermentation duration but beans treated in boxes were significantly (P = 0.05) acidic from 1.40 and 3.07 meq of NaOH g?1. Fungal population did not vary in number depending both on the duration and the fermentation method with rates that ranged from 3.32 × 107 to 8.63 × 107 CFU g?1. 相似文献
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N Koffi E Aka-Danguy A Ngom B Kouassi BA Yaya M Dosso 《Canadian Metallurgical Quarterly》1998,15(5):643-647
OBJECTIVE: To assess the quantity and nature of the proteins that adsorb to hydrocephalus shunt catheters after implantation, and to determine whether sufficient could accumulate to obstruct the catheter. DESIGN: Elution of proteins from 102 explanted shunt catheters, with protein assay and electrophoresis of the eluate, and scanning electron microscopy (SEM) of the catheters. RESULTS: The amount of protein elutable was extremely low, and significant protein, apart from a thin film, was not found on SEM. Qualitative analysis disclosed that most of the adsorbed protein was albumin. CONCLUSIONS: Protein deposition on hydrocephalus catheters does not occur in sufficient quantities to cause catheter obstruction. 相似文献
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Koffi L Dagnon Hua H Chen Lucia H Innocentini‐Mei Nandika A D'Souza 《Polymer International》2009,58(2):133-141
BACKGROUND: The thermomechanical performance of poly[(3‐hydroxybutyrate)‐co‐(3‐hydroxyvalerate)] (PHBV) is associated with its crystallization. Enhanced nucleation using a stearate‐functionalized synthetic layered double hydroxide (LDH) presents a potential solution. RESULTS: PHBV crystallization varied with concentration of LDH. At lower LDH concentration, thermal history‐induced cold crystallization was present. The extent of this order–disorder transition decreased with increasing LDH concentration and was completely eliminated at 7 wt% LDH. PHBV did not have a melt recrystallization peak but the introduction of LDH resulted in an increasingly pronounced melt recrystallization with increasing LDH concentration. Polarized optical microscopy coupled with differential scanning calorimetry and wide angle X‐ray diffraction (WAXD) analysis indicated increased lamella thickness in the nanocomposites compared to pure PHBV. WAXD and transmission electron microscopy showed that the nanocomposites had an intercalated but aggregated dispersion. CONCLUSION: The concentration of nanofiller provides unique effects in PHBV. Mechanical performance was found to scale with composition as determined using dynamic mechanical analysis and tensile testing. Copyright © 2008 Society of Chemical Industry 相似文献
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Kamenan Koffi A. Jagadeesh Anooja Kre N’guessan Raymond Assanvo Edja Florentin Soman Suraj Unni K. N. Narayanan 《Journal of Materials Science: Materials in Electronics》2021,32(11):14217-14217
Journal of Materials Science: Materials in Electronics - A correction to this paper has been published: https://doi.org/10.1007/s10854-021-06180-2 相似文献
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Yao Koffi Jocelyne M. Bosson Marius Ipo Gnetto Edoe F. Mensah Jeremie T. Zoueu 《Journal of Modern Optics》2013,60(17):1763-1776
ABSTRACTWe describe in this work an approach that individually combines constant initialization, free-space backpropagation, transport of intensity equation (TIE) and multi-height phase recovery with Fast Iterative Shrinkage-Thresholding Algorithm (FISTA) to predict reconstruction of the phase microspheres from diffracted field measurements. We incorporate appropriate initialization and regularization to reconstruct unknown phase microspheres (transparent objects). 相似文献
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Thermal properties of glass fiber reinforced polyamide 6 composites throughout the direct long‐fiber reinforced thermoplastic process 下载免费PDF全文
Thomas Whitfield Takashi Kuboki Jeffrey Wood Vanja Ugresic Shyam Sathyanarayana Koffi Dagnon 《Polymer Engineering and Science》2018,58(1):46-54
The direct long‐fiber reinforced thermoplastic (D‐LFT) process offers a streamlined material processing technique and decreases the degradation of the material. To ensure product consistency and process optimization, it is imperative to understand how the process sequence affects degradation and thermal properties of the material during the D‐LFT process. This study investigates variation in molecular weight and thermal properties of the glass fiber reinforced polyamide 6 (PA6) composites throughout the D‐LFT process. Viscosity number (VN) measurements, thermogravimetric analyses (TGA), and differential scanning calorimetry (DSC) analyses were performed on samples taken from different locations along the D‐LFT process. It was found that VN, which is a measure of molecular weight of the PA6 base resin, decreased throughout the processes. In contrast, TGA results suggested that apparent activation energy for decomposition increased during consecutive process stages. Non‐isothermal DSC results showed that there were no significant changes to the degree of crystallization; however, isothermal DSC results indicated that later stages of the process showed a decrease in crystallization half‐time, and the largest changes were observed in areas after the two extrusion portions of the process. POLYM. ENG. SCI., 58:46–54, 2018. © 2017 Society of Plastics Engineers 相似文献
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Membrane fouling is a major problem, which extent depends on the respective natures of the solute and membrane material. Membrane surface characterization under different fouling conditions may help in understanding the fouling mechanism. Such characterization was performed for the case of humic substances filtered on two nanofiltration membranes, using special contact angles measurements. The measured contact angles allowed the calculation of polar and non-polar contributions to the surface energy of dry, hydrated and fouled membranes. The results reveal significant differences in the two membrane behaviours and information about the way that fouling material may be adsorbed on membrane surface. 相似文献