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1.
Rheological behavior of mucilage obtained from two varieties of coffee grown in Colombia (Caturra and Colombia) was studied as a function of ripe cherry content (RCC) and postharvest time (PHT). A Brookfleld HB DV-III viscometer was used in concentric cylinder geometry over a shear rate range of 4.8 to 120 s−1 . the power-law model was used to describe the shear stress versus shear rate data, and the consistency index (K) and flow behavior index (n) were determined. the mucilage is a highly viscous and pseudoplastic (n < 0.3) fluid. the K increased and n decreased as the RCC and PHT increased. the mucilage of the Caturra variety was more viscous and shear thinning than that of the Colombia variety. Microstructural examination of the mucilage revealed that certain weak structures as phloem vessels found in the mucilage may be destroyed upon application of shear stress and may contribute to the pseudoplastic nature of the mucilage. Diffusion of tannin from the pulp to mucilage with delay in postharvest processing may be responsible for increased apparent viscosity with increased PHT. 相似文献
2.
C. V. SUNDARAM A. K. TANEJA CH. SRIDHAR RAO 《Mineral Processing and Extractive Metallurgy Review》2013,34(1):239-265
The reactive and refractory metals zirconium, titanium, tantalum and niobium have been in commercial production and industrial application over the last 30 years and more. With growing experience, there has been progressive improvement in process and equipment designs in the industrial practice. There has also been a continuous drive to develop entirely new processes, and to diversify the applications of these metals. The paper reviews the present status and the emerging trends, and places the Indian work in the global perspective. 相似文献
3.
J. LYU A. GUNASEKARAN V. KACHTTVICHYANUKUL 《International journal of systems science》2013,44(6):1333-1341
The availability of more and more cost-effective and powerful parallel computers has enhanced the ability of the operations research community to solve more laborious computational problems. In this paper an attempt has been made to implement a parallel simulation runs dispatcher with an objective to study the feasibility of establishing a portable and efficient parallel programming environment. This parallel simulation run dispatcher can be applied to both terminating type and steady-state type simulation models. The algorithm is then transferred and executed on various other shared-memory multiprocessor systems to illustrate its portability. Another contribution of this paper is to verify whether the performance of the portable code and the non-portable code of a same algorithm is significantly different on a specific parallel system using the analysis of covariance model. 相似文献
4.
A. K. SARAF J. D. DAS B. AGARWAL R. M. SUNDARAM 《International journal of remote sensing》2013,34(18):3725-3733
The remote sensing data of a rugged terrain always suffer from topographic effects and, in such cases people frequently perceive valleys as ridges, and vice versa in the optical imagery of Sun-synchronous satellite. The appearance of inverse topography can be termed as false topography perception ( FTP) FTP has been observed in various satellites images such as Landsat, IRS, and SPOT The problem of FTP becomes more severe in high altitude areas of hilly terrain, such as Himalayan terrain. FTP is usually caused by the combination of various interrelated factors; among them are topographic relief, Sun elevation, the azimuth angle, viewing angle, and hatching or engraving features present on the slopes. Once satellite data of rugged terrain are acquired, then all FTP-influencing factors are fixed, except for the viewing angle of the observer. Hence, the correction of FTP becomes straightforward. There are two ways to correct satellite dala for FTP effects: ( a) rotate the image by between 135° -180° i.e changing the viewing angle of the observer; or (b) inverse the image data by making a negative of the whole image (255-image) which will bring change in the Sun' s illumination by 1807deg; The present paper discusses the FTP phenomena and its causes, and suggests methods of correction. 相似文献
5.
This paper models the cross-sectional variation of earnings-price (E/P) ratios using Finnish data. Although E/P ratios are very commonly used in practical investment decisions, the cross-sectional determinants of E/P ratios have reached only limited attention so far. In this paper it is shown that a substantial part of the cross-sectional variation of Finnish E/P ratios can be devoted to differences in securities systematic risk estimated by instrumental accounting variables, such as accounting betas, financial leverage, operating leverage and growth. After controlling the E/P ratios for the effects of these instrumental risk variables, the E/P anomaly becomes insignificant in the Finnish stock market. This finding suggests that the E/P anomaly generally observed in major financial markets may be largely due to the serious empirical problems in risk estimation. 相似文献
6.
Changes in the dynamic and transient rheological character of highmoisture, skim milk (HMSM) Mozzarella cheese due to the addition of 0.2% Methocel (methyl cellulose) as a water binder at room (25C) and refrigeration (7C) temperatures during early stages of maturation (1, 5, 7, and 14 days after manufacture) were investigated. The HMSM Mozzarella with 0.2% Methocel was softer (lower dynamic storage and loss modulus, and higher creep and recovery compliance) compared to HMSM Mozzarella without Methocel, due to improved water holding capacity. The age-dependent frequency dispersions of dynamic mechanical spectra (storage and loss modulus) were fitted to a power-law model. A six-element Voigt-Kelvin mechanistic model described the age-dependent retardation spectra (compliances, viscosities, and retardation times) obtained from creep experiments. Strong correlation was obtained between the viscoelastic 相似文献
7.
A single-screw, intermittent-reversing counter current diffusion-extractor (CCDE) was used. Two mathematical models were developed to predict soluble solids concentration profile along the length of the CCDE. Both models predicted an exponential concentration profile and good intra-flight mixing. Experimentally obtained soluble solids concentration profiles in the CCDE using applies and pears validated the model predictions. 相似文献
8.
Samples were subjected to uniaxial compression at six deformation rates until fracture occurred. Fracture strain, stress and work, deform-ability modulus, and biaxial extensional viscosity were determined. No significant effect of surface lubrication was observed on magnitudes of the selected mechanical properties. Irrespective of deformation rate Cheddar cheese fractured at a strain of 55.5% when aspect ratio was 0.65, and at a strain of 59.7% when aspect ratio was 1.0. The fracture stress ranged from 34 to 107 kPa and fracture work from 22 to 63 kJ/m3. Mean deformability modulus of Cheddar cheese was 240 kPa. Biaxial extensional viscosity was a decreasing function of strain rate. 相似文献
9.
Rheological properties of low-moisture part-skim Mozarella cheese were evaluated as a function of storage time, test temperature, and deformation rate by uniaxial extension in a horizontal plane. Proteolysis of Mozzarella cheese caused marked decreases in the tensile strength and the deformability modulus, but not in the fracture strain. As the temperature increased from 10 to 40C, the fracture strain increased more than five-fold. The strength and the deformability modulus decreased about 60 and 85%, respectively, as the cheese temperature increased from 10 to 30C. The fracture strain of the cheese did not exhibit a clear trend with the deformation rate in the range of 50–500 mm/min. However, its strength and deformability modulus increased with the increasing deformation rate. 相似文献
10.
MYOGLOBIN OXIDATION IN GROUND BEEF: MECHANISTIC STUDIES 总被引:1,自引:0,他引:1