Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract The cospectra of momentum (M), sensible heat (H), latent heat (LE), and carbon dioxide (Fc) fluxes measured by eddy covariance (EC) over a shortgrass steppe are calculated for over 800 time intervals spanning a range of...

according to the former researcher’s presented relations for flow through rock-fill porous media, the effects of physical characteristics was not studied separately. hence, due to the application of these relations, physical characteristics of porous materials effect must be investigated separately. in various constructed physical models of porous media, the effect of several variables such as ...

Spectra of distant nebulae, compared with those of neighboring nebulae, are shifted toward the red by amounts which increase with the distance which the light has traveled. This fact indicates that we are confronted with a phenomenon which involves history on a large scale, history either of the universe as a whole, or history of some of its individual parts. Scientifically speaking, history me...

This paper proposes analytical modeling and design of a 27.12 MHz single-switch dc-dc converter with galvanic isolation using PCB transformer. The ODE-based approach provides more accurate circuit by considering the high-order harmonics non-ideal components such as diode capacitances. proposed dimensionless mathematical model simplifies desired requires less tuning procedure. In addition, effec...

Non contact laser ultrasonic methods are appropriated for investigating SAW propagation on curved surfaces. They eliminate coupling issues in the generation and detection of the waves, and their high temporal resolution enables studying the dispersion effect on a large frequency range. We investigate the variations of the phase and group velocities for Rayleigh waves propagating on a sphere or ...

Thermal response functions of strongly correlated electron systems are of appreciable interest to the larger scientific community both theoretically and technologically. Here, we focus on the infinitely correlated t-J model on a geometrically frustrated two-dimensional triangular lattice. Using exact diagonalization on a finite sized system, we calculate the dynamical thermal response functions...

To calculate the pressure pulsations in pipelines in frequency domain, it is necessary to linearize the nonlinear damping function jqjq, under the condition that the flow q is periodic, but not sinusoidal. The authors have proposed an idea that two equivalent linearization coefficients should be determined in such cases. To verify the idea, the responses of pressure pulsation in a simple pipeli...

the freshwater angel fish (pterophyllum scalare schultze, 1823) is south american cichlid become very popular among aquarists. there is little information on their culture and aquarium husbandry. in this study growth performance and survival rate of angelfish subjected to different feeding frequencies were evaluated. four groups of angel fish juveniles (0.87 ± 0.01 g; 3.98 ± 0.08 mm) were fed e...

Electrophoretic differential transport of ionic species in a solution moving from a large reservoir into a small channel is investigated numerically. The system setup is similar to the experiments of Polson, Savin, and Hayes (J. Microcol. Sep. 2000, 12, 98), where the bulk flow into a fused-silica capillary was driven by a pressure differential. A critical condition for achieving the defined di...

We investigate the equilibrium properties of self-gravitating magnetized clouds with polytropic equations of state with negative index n. In particular, we consider scale-free isopedic configurations that have constant dimensionless spherical mass-to-flux ratio λr and that may constitute “pivotal” states for subsequent dynamical collapse to form groups or clusters of stars. For given Γ = 1 + 1/...