0003-682X/$ see front matter 2009 Elsevier Ltd. A doi:10.1016/j.apacoust.2009.07.003 * Corresponding author. Tel.: +1 217 352 6511. E-mail address: [email protected] (G.W. Swen Experiments were performed to measure the various sound-wave propagation parameters of two kinds of gravel, a crushed limestone and a stream-formed ‘‘pea gravel”, at frequencies between 25 and 200 Hz. The apparatus w...

Self-consolidating concrete (SCC) has been developed for use in precast prestressed concrete bridge girders in the state of Minnesota. Locally available materials were used with a number of cementitious and filler materials, including ASTM Type III cement, Class C fly ash, and blast furnace slag. SCC was successfully proportioned with both natural river gravels and crushed stone as coarse aggre...

Natal homing is a hallmark of the life history of salmonid fishes, but the spatial scale of homing within local, naturally reproducing salmon populations is still poorly understood. Accurate homing (paired with restricted movement) should lead to the existence of fine-scale genetic structuring due to the spatial clustering of related individuals on spawning grounds. Thus, we explored the spatia...

Fourier transform-infrared microspectroscopy (micro-FT-IR) operated in attenuated-total-reflectance (ATR) and transmission modes following stereomicroscopy was used for the purpose of matching known and questioned paint samples in a fatal hit-and-run case. A tiny, thin and smeared dot of red paint sticking on the broken-off cross section of a side-mirror rod was taken from the victim motorcycle...

The existence of gravels in the glutenite formations leads to complex geometries hydraulic fracturing propagation and difficult construction engineering. To study law formations, this paper establishes a fracture model for heterogeneous based on discrete element method, analyzes effects gravel content, particle size, distribution, horizontal stress difference, fluid viscosity flow rate behavior...