We present a neutron scattering study of the structure and diffusion of myoglobin solutions at high concentration. The protein–protein structure factor was determined by small angle neutron scattering (SANS) measurements using mean spherical analysis (MSA), and the intermediate scattering function was measured by neutron spin-scho spectroscopy. We observe the cross-over between self-diffusion a...

Diffusion is an inevitable important factor in advertising dynamic systems. However, previous literature did not involve this diffusion factor, and only involved the local stability of model. This paper develops a global criterion for impulsive model with feedback term under influence diffusion. Since requires unique existence equilibrium points, variational methods are employed to solve it inf...

Acetic acid was separated from a dilute mixture using a commercial polyvinyl alcohol (PVA) membrane.  Intrinsic separation characteristics of the membrane were studied as a function of temperature.  The degree of membrane swelling decreased marginally with increase in feed temperature. At 25oC the maximum degree of swelling was found out to be 46.3%, which reduced to 39.5%...

The purpose of this study was to determine the diffusion sensitivity factor b that optimizes the contrast-to-noise ratio (CNR) for both diffusion-weighted signal intensity and the apparent diffusion coefficient (ADCNR) when evaluating ischemic stroke by diffusion-weighted MRI. The relative contrast, noise levels, CNR, and ADCNR were calculated for typical ADC values in human brain, 780 microm(2...

Krylov implicit integration factor (IIF) methods were developed in Chen and Zhang (J Comput Phys 230:4336–4352, 2011) for solving stiff reaction–diffusion equations on high dimensional unstructured meshes. The methods were further extended to solve stiff advection–diffusion–reaction equations in Jiang and Zhang (J Comput Phys 253:368–388, 2013). Recently we studied the computational power of Kr...

PURPOSE Hypertensive encephalopathy, a complex of cerebral disorders, including headache, seizures, visual disturbances, and other neurologic manifestations, is associated with a variety of conditions in which blood pressure rises acutely. It has been ascribed to either exuberant vasospasm with ischemia/infarction or breakthrough of autoregulation with interstitial edema. Diffusion-weighted MR ...

Diffusion actions of chemical waves are calculated as the product Kκmλu = h, where K is the diffusivity factor, κ is the tortuosity factor, m is the particle mass, λ is the wavelength, u is the propagation speed, h is a characteristic constant of the diffusion action. During evolution of successive LR (Liesegang ring) waves, BZ (Belousov-Zhabotinsky) waves, and cAMP (cyclic adenosine 3 ́,5 ́-mono...