Foam drainage varies with surfactant. We present direct measurements of the flow velocity profiles across single Plateau borders, which make up the interconnected channel-like network for liquid flow. For protein foams the interface is rigid, whereas small-surfactant foams show significant interfacial mobility. The results agree with a model that takes into account the shearing of the liquid-ga...

The frequency-dependent viscoelastic shear modulus of concentrated suspensions of colloidal hard spheres is shown to be strongly modified as the volume fraction approaches the glass transition. The elastic or storage component, G0, becomes larger than the viscous or loss component, G00. The frequency dependence of G0 develops a plateau while that of G00 develops a minimum. We propose a physical...

The apparent shear viscosity, in the non-Browman Ilmit, for a homogeneous suspension of monodispersed hard spheres in systems ranging from dilute to concentrated was previously established. From an estimation of the viscous dissipation. We use the inter-particle distance dependence of the shear viscosity for determining the components of a local stress tensor associated with the transient netwo...

Microgel particles with a soft repulsive interaction potential are investigated with particle tracking methods to study the phase behavior of soft-sphere systems. The use of poly(N-isopropylacrylamide) particles allows the effective volume fraction of a sample to be tuned via thermal modulation without altering the particle number density. This allows for investigation of the phase behavior of ...

do.usbr. Summary We investigate the applicability of the Two-dimensional, Runoff, Erosion and Export (TREX) model to simulate extreme floods on large watersheds in semi-arid regions in the western United States. Spatially-distributed extreme storm and channel components are implemented so that the TREX model can be applied to this problem. TREX is demonstrated via calibration, validation and si...

User stories form the heart of the Extreme Programming methodology planning game. In its turn, Extreme Programming is one of the supporting pillars of the wider Agile Software Development process. The user stories form a set of central work products that determine the software development processes. In the spirit of Extreme Programming the production of user stories is kept as simple as possibl...

A concise description is presented in the basic features of formalism non-canonical spacetime volume forms and its application modified gravity theories cosmology. The well-known unimodular theory appears as a very special case. Concerning hot issues facing cosmology now, we specifically briefly outline construction of: (a) unified dark energy matter manifestations single material entity—a scal...

We present a study of volume index gratings operating in the form-birefringence regime and what we call the intermediate regime, defined as the regime between form birefringence and the onset of diffraction. The operating regime is characterized by the ratio between the measurement wavelength and the grating period: form birefringence regime below 10, diffraction around 3, and intermediate regi...