排序方式： 共有45条查询结果，搜索用时 15 毫秒
41.
JOSEPH THOMAS G. P. PHONDKE V. G. TATAKE A. R. GOPAL-AYENGAR 《Photochemistry and photobiology》1970,11(2):85-92
Abstract— The pigments in vivo of single cells of Chlorella pyrenoidosa were studied by the microspectrophotometric technique. An accessory recording the first derivative of absorption was used to obtain fine resolution and enhanced accuracy. The results suggest that there are several long-wavelength components of Chl a in vivo. In addition, there seem to be four short-wave forms of Chl a. It is also likely that Chl b exists in vivo in two different forms. The existence of all these forms was demonstrated at room temperature. 相似文献
42.
HONG LUO DMITRI SHAROV JOSEPH D. BAUM RAINALD LÖHNER 《International Journal of Computational Fluid Dynamics》2013,27(4):253-270
An accurate, fast, matrix-free implicit method has been developed to solve compressible turbulent How problems using the Spalart and Allmaras one equation turbulence model on unstructured meshes. The mean-flow and turbulence-model equations are decoupled in the time integration in order to facilitate the incorporation of different turbulence models and reduce memory requirements. Both mean flow and turbulent equations are integrated in time using a linearized implicit scheme. A recently developed, fast, matrix-free implicit method, GMRES+LU-SGS, is then applied to solve the resultant system of linear equations. The spatial discretization is carried out using a hybrid finite volume and finite element method, where the finite volume approximation based on a containment dual control volume rather than the more popular median-dual control volume is used to discretize the inviscid fluxes, and the finite element approximation is used to evaluate the viscous flux terms. The developed method is used to compute a variety of turbulent flow problems in both 2D and 3D. The results obtained are in good agreement with theoretical and experimental data and indicate that the present method provides an accurate, fast, and robust algorithm for computing compressible turbulent flows on unstructured meshes. 相似文献
43.
JOSEPH T. BUONTEMPO HENRY G. POTRYKUS ALFRED I. KAUFMAN 《The Journal of mathematical sociology》2013,37(2):113-136
Analytical models are used to examine theories of military combat, a violent conflict between two groups. Typically these models focus on combat power (manpower and technology) and ignore intrinsic sociological factors, both in terms of the interaction between forces, and each force's organizational structure and internal dynamics, such as social climate, morale, and leadership. This paper describes a symmetric adaptive model of combat, in which the use of feedback allows opposing forces to attempt to regulate the intensity of the fight, or even abandon the fight, depending on battlefield losses. Furthermore, parameters are introduced to provide a framework for incorporating the sociological structure and dynamics of the two forces. A preliminary analysis of the model is presented. 相似文献
44.
BENJAMIN LEVY CHARLES COLLINS SUZANNE LENHART MARGUERITE MADDEN JOSEPH CORN RENÉ A. SALINAS WILLIAM STIVER 《Natural Resource Modeling》2016,29(1):71-97
Feral Hogs (Sus scrofa) are an invasive species that have occupied the Great Smoky Mountains National Park since the early 1900s. Recent studies on vegetation, mast, and harvest history were important for our work. Using these data, a model with discrete time and space was formulated to represent the feral hog dynamics in the Park. Management strategies and key characteristics of the population were investigated. The model uses observed mast variation to help govern population dynamics and results indicate that Park control efforts have limited the growth of the population. 相似文献
45.
ANTHONY JOSEPH 《Transformation Groups》2012,17(2):513-521
A direct proof of a Harish-Chandra isomorphism recently established by Khoroshkin, Nazarov and Vinberg [10] involving Zhelobenko operators, is given. A key point is the computation of certain determinants analogous to those of Parthasarathy, Ranga Rao, Varadaragan [14]. This analysis avoids the passage to graded objects and the subsequent geometric arguments. 相似文献