This paper analyzes laminar viscous fluid flow through interstices in order to properly design the labyrinth seals and improve the volumetric efficiency of the turbomachines. The theoretical study and hydrodynamic modeling of the threedimensional flow inside the labyrinth was made using a CFD application ANSYS Fluent, on different labyrinth geometries. There were determined: the flow spectrum, ...

The sluicing flume that was designed is less capable of silting up and losing its calibration than its counterparts of standard sharp-crested compound weir design. The laboratory work described here led to a refinement in the design in the form of a short flume set into the lowest section of a compound Crump weir gauging installation. Critical flow occurs near the exit of this flume, and it is ...

Microbial ecosystems are often assumed to be relatively stable over short periods of time, but this assumption is seldom tested. An urban stream influenced by both flow and varying levels of anthropogenic influences is expected to have high temporal variability in microbial composition, and short-term ecological instability. Thus, we analyzed the bacterioplankton composition of a weir-fragmente...

Abstract—This study investigated the change of weir structure performances when durability of concrete, which is the main material of weir structure, decreased due to their aging by mean of seismic fragility analysis. In the analysis, it was assumed that the elastic modulus of concrete was reduced by 10% in order to account for their aged deterioration. Additionally, the analysis of seismic fra...

and canyon sediments in several canyon reaches are contaminated with low-levels of radionuclides from hisFollowing the May 2000 Cerro Grande fire at Los Alamos, NM, toric LANL operations (Reneau et al., 1998). To mitisurface water control structures were constructed near Los Alamos to mitigate the transport of contaminant-bearing sediment toward the gate potential off-site migration of these se...

• High-level and Process Patterns from the Memory Protection Society. James Noble and Charles Weir. In Pattern Languages of Program Design 4. Neil Harrison, Brian Foote and Hans Rohnert, editors. Addison-Wesley, 1999. • Patterns for Small Machines. James Noble and Charles Weir. Proceedings of the European Conference on Pattern Languages of Program Design, Irsee, Germany. Universitäts Verlag Kon...

This article has been extracted from the book, The Next Hundred Years: Man's Natural and Technological Resources, b y Harrison Brown, James Bonner, and John Weir, published this month* Dr. Brown is professor of geochemistry at Caltech; Dr. Bonner, professor of biology; Dr. Weir, professor of psychology. This extract, the last in a series of three, has been drawn largely from Dr. Weir's evaluati...