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排序方式: 共有78条查询结果,搜索用时 31 毫秒
31.
A. Kriaa M. Hajji F. Jamoussi A. H. Hamzaoui 《Surface Engineering and Applied Electrochemistry》2014,50(1):84-94
The A.C. impedance plots were used as tools to analyze the electrical response of two varieties of Tunisian halloysite 1: 1 and illitic samples 2: 1 as a function of frequency at different temperatures (80–800°C). The real and imaginary parts of the complex impedance trace semicircles in the complex plane. Except for the illite, It-1, the second sample analyzed in this study, these plots give evidence for the presence of both bulk and grain boundary effect, above 600°C onwards. The bulk resistance of the materials decreases with the rise in temperature. Impedance Spectroscopy data reveal a non-Debye type of dielectric relaxation. The Nyquist plots show the negative temperature coefficient of resistance of both pure Tunisian illite and halloysite samples. The results of bulk electrical conductivity and its activation energy are presented for the two mineral clay samples. For illite It-1, the activation energy values estimated from the AC conductivity pattern and modulus pattern are very similar and suggest a possibility of a long-range mobility of charge carriers (ions) via hopping mechanism of electrical transport processes at higher temperature. On the other hand, for the halloysite sample provided from kasserine, (Ha-Kass), the modulus analysis admit that the electrical transport processes of the material are very likely of electronic nature. Relaxation frequencies follow an Arrhenius behavior with the activation energy values not comparable to those found for the electrical conductivity. 相似文献
32.
Fethia Fazouane-Naimi Aicha Mechakra Radia Abdellaoui Abdelouheb Nouani Saadatou Magagi Daga Aminata Marou Alzouma 《Food Biotechnology》2013,27(3):258-269
An ochratoxin free extracellular acid protease was produced by solid state cultivation of Aspergillus niger FFB1. The purified enzyme (48.7 kDa) showed an optimal milk clotting activity at pH 5.5 and 45°C in the presence of 0.01 M CaCl2. The enzyme was stable at least 24 h at 35°C in the pH range of 5.5–7.0. Thermal denaturation started above 45°C. Fresh cheese manufactured with reconstituted cow milk and the purified enzyme showed similar basic characteristics (pH 4.5, acid taste, white color) as marketed cheeses obtained with calf rennet. This emphasizes the value of exploiting local biological resources for value added food processing in developing countries. 相似文献
33.
Walid Kriaa Hamadi Fetoui Mohamed Makni Najiba Zeghal Nour-Eddine Drira 《International Journal of Food Properties》2013,16(6):1220-1232
The antioxidant capacity and phenolic content of three varieties of Phoenix dactylifera leaves, namely Deglet Nour, Medjhoul, and Barhee, were studied. The antioxidant activities of extracts of different leaf varieties obtained with solvents of different polarity were investigated using assays of 2, 2-diphenyl-2-picrymhydrasyl hydrate radical-scavenging activity, total phenolics and flavonoids amount, condensed tannins, reducing power, and total antioxidant capacity. The results showed that all the extracts exhibited antioxidant and radical-scavenging activities at different magnitudes and potency. The decreasing order of antioxidant and radical-scavenging activities among the extracts assayed were found to be methanol (MeOH) fraction > ethyl acetate fraction > hexane fraction > water extract. Correlation analysis indicated that there is a linear relationship between antioxidant potency, free radical-scavenging ability, and the content of phenolic and flavonoids compounds of Phoenix dactylifera leaf extracts. These results showed that Phoenix dactylifera leaf extracts are a valuable natural antioxidant, which can be applied in both healthy medicine and food industry and biotechnology. 相似文献
34.
Single channel enhancement techniques based on short-time spectral amplitude (STSA) estimation have the major drawback of
generating an artificial and annoying residual noise with musical character, due mainly to the unwanted peaks in the denoised
signal spectrum. The detection and reduction of spectral peaks which have a musical characteristic are the main objectives
of this paper. The proposed perceptual technique to reduce musical residual noise operates as a post-processing. Based on
human auditory properties, the perceptual post-processing is established in a number of steps. First, we detect musical peaks
by comparing tonality coefficients in each critical band of both denoised signal and reference signal. Detected musical peaks
are audible only if they exceed the clean speech masking threshold (MT). However, the clean MT is not available. It is estimated
by modifying the Johnston model. Secondly, we reduce the musical residual noise by removing only audible musical peaks which
exceed the estimated MT. The proposed method is tested and compared with classic STSA technique and perceptual techniques
at various levels of white and colored noise. Results show the validity of the proposed technique. 相似文献
35.
36.
Synergetic Hepatoprotective Effect of Phenolic Fractions Obtained from Ficus Carica Dried Fruit and Extra Virgin Olive Oil on CCL4‐Induced Oxidative Stress and Hepatotoxicity in Rats
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37.
El Assal Aicha Breiss Hanadi Benzerga Ratiba Sharaiha Ala 《Journal of Materials Science》2021,56(35):19484-19500
Journal of Materials Science - This article presents a strategy for designing optimal microwave planar multilayer absorbers based on epoxy foam composites loaded with carbon fibers of... 相似文献
38.
Producing Aspergillus tubingensis CTM507 Glucose oxidase by Solid state fermentation versus submerged fermentation: process optimization and enzyme stability by an intermediary metabolite in relation with diauxic growth
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39.