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1.
J.-M DURAND J OLIVIER-FOURCADE J.-C JUMAS M WOMES P PARENT 《Journal of Materials Science》1997,32(17):4679-4686
The local environment of arsenic atoms in vitreous samples of the system Sb2S3–As2S3–Tl2S has been studied by EXAFS at the AsK-edge. The crystalline compound Tl5.6As15S25.3 situated within the zone of glass formation of the Sb2S3–As2S3–Tl2S phase diagram was used as reference compound in order to derive appropriate phase and amplitude functions. The structure
parameters determined were the number of first neighbours N
As–S, the arsenic-sulphur distance, R
As–S, and the Debye-Waller factor, σAs–S. The influence of the glass-forming antimony sulphide Sb2S3 and the glass-modifying thallium sulphide Tl2S on the As2S3 host matrix has been shown.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
2.
GUY JUMARIE 《International journal of systems science》2013,44(2):281-293
Most of the literature devoted to the study of dynamic populations with predators is focused on the use of the so-called ‘population law’ discovered by Verhulst in 1937, and generalized later by several authors. Basically this model deals with the total number of individuals in the population, irrespective of their distribution over the geographical space of definition. In contrast, the present paper suggests a distributed approach to populations with intra-species competitions, which explicitly takes into account the distributed parameter, for instance the age, of the individuals. Two models are given: a distributed version of the logistic law and a generalization of the transfer equation, and two frameworks are considered: the deterministic case and the stochastic one. The equations so obtained are mainly distributed differential integral equations; one considers The optimum control or such systems and necessary optimality conditions are given. The covariance of the deviation from a steady state in the presence of random fluctuations is derived. This model applies not only to biological populations, but also to social and economic systems, and it may be used as a basis for general studies on populations with intra-species competitions. 相似文献
3.
GUY JUMARIE 《International journal of control》2013,86(5):853-871
In this paper, we give first a contribution to the ‘dual input describing function’ of West et al. (1956); we show how it is possible to define by means of the characteristic curve of the non-linearity alone, without knowing the mathematical expression for it. Secondly, we give a new method for determining the self-oscillation of a non-linear system dependent on reactive energy considerations. Lastly, we extend the theory to non-linear multivariable systems. On donne une contribution à la notion de ‘double fonetion de transfert équivalente’ de West et al. (1956), et on montre comment il est possible déterminer uniquement à l'aide de la courbe de gain g(x), sans connaicirc;tre son expression mathématique. On donne une nouvelle méthode pour améliorer la précision du premier harmonique, basée sur des considérations relatives à l'énergie réactive du systéme. 相似文献
4.
To assess the effects of a-tocopherol addition on lipid and pigment oxidation of ground pork, 10, 100 or 1000 ppm was added directly to ground pork in a food grade carrier (2% Medium Chain Triglyceride Oil) then pork was overwrapped with polyvinyl-chloride film and displayed at 4C for three days. Addition of α-tocopherol to ground pork had limited effects on color and sensory characteristics. Display time and light present during display had detrimental effects on a* value, total color, red color contributed by oxymyoglobin, percent of myoglobin, metmyoglobin and oxymyoglobin, visual red and grey colors. 相似文献
5.
M. SUSAN BREWER BHARATI K. ROSTOGI LITSA ARGOUDELIS GUY K. SPROULS 《Journal of food science》1995,60(1):58-62
Ground pork (15% fat) was formulated to contain 0% to 3.0% sodium chloride and/or 0% to 3.0% sodium lactate (SL) resulting in 28 treatment combinations. Five replications consisted of two with low initial microbial loads (< 103 CFU/g) and three with high initial loads (> 105 CFU/ g). Ground pork (454g) was overwrapped in PVC and stored (4°C) aerobically for 21 d. A significant salt × SL interaction existed for redness of samples with low initial aerobic plate count (APC). Red color was best preserved by 2.0% or 3.0% SL. Initial pH values of low and high initial APC samples were similar. Initial product pH was best maintained by higher SL levels in low initial load samples and by higher sodium chloride levels in high initial load samples. Samples containing 3.0% SL had the lowest APC regardless of salt level. 相似文献
6.
In our review of the literature concerning sustainable architecture, we find a remarkably diverse constellation of ideas that defy simple categorization. But rather than lament the apparent inability to standardize a singular approach to degraded environmental and social conditions, we celebrate pluralism as a means to contest technological and scientific certainty. At the same time, we reject epistemological and moral relativism. These twin points of departure lead us to propose a research agenda for an architecture of reflective engagement that is sympathetic to the pragmatist tradition. 相似文献
7.
GUY BIELICKI SORAYA BENDERBOUS LOÏC FOUCAT JEAN PIERRE DONNAT JEAN PIERRE RENOU 《Journal of food science》1994,59(6):1271-1274
The energy catabolism in brine-injected muscles was examined by 31P Nuclear Magnetic Resonance (NMR) spectroscopy. Immediately after death of rabbits, brines containing NaCl, with or without pyrophosphate, were injected into the arterial system. 31P NMR spectra at 4°revealed marked heterogeneity in postmortem catabolism due to brine diffusion. The heterogeneity of the Pi signal for injected muscles reflected the existence of muscle areas with different intracellular pH values. This observation suggested an increase in rate of glycolysis for fibers experiencing brine. The heterogeneity of brine diffusion seemed to be affected by method of injection. 相似文献
8.
9.
Fine particles were dispersed in a fuel structure to trap fission gases as very small bubbles and thereby reduce fuel swelling. The dispersions were made by adding 1.5 to 3.0 wt% W to the UC; the specimens were irradiated to a maximum of ∼2 at.% burnup. Density changes were used as the measure of swelling; there was much scatter in the results. Tungsten reduced the swelling when it was uniformly dispersed. For some samples having excess U and W or a segregated structure, W increased the swelling. The results tentatively confirm that fine particles are of value in reducing fission-gas swelling of carbide fuels. 相似文献
10.
Reactive lysine determination in mixtures containing lysine in the free form or in small peptides by the l-fluoro-2,4-dinitrobenzene (FDNB) procedure is complicated by the fact that both amino groups of lysine can react with FDNB. Quantitative conversion of lysine to its copper salt, followed by reaction with FDNB, has been reported. However, the present study demonstrated that copper complexation was incomplete, even when alanine was added to better protect the free α-amino group of lysine. The FDNB procedure would, therefore, be of questionable value for the determination of reactive lysine in protein hydrolysates. 相似文献