In view of the incomplete signal and other issues brought by the threshold trigger in the conventional blast wave signal test, this paper designed a post-trigger data high-speed collection method, adopted the ARM7 kernel MCU to complete the design of the hardware scheme and preparation of the corresponding test software, then developed the posttrigger data high-speed collector prototype, and co...

Stress-wave profiles in vitreous GeO2 induced by planar and spherical projectile impact were measured using piezoresistance gauges in the 4 to 18 GPa shock pressure range. The planar experiments demonstrate the response of vitreous GeO2 . This response can be divided into three regimes: ~1! An elastic shock regime with ramp 4 GPa Hugoniot elastic limit ~HEL! precursor. Shock propagation velocit...

The theory of shock dynamics in two dimensions is reformulated to treat shock propagation in a non-uniform medium. The analysis yields a system of hyperbolic equations with source terms representing the generation of disturbances on the shock wave as it propagates into the fluid non-uniformities. The theory is applied to problems involving the refraction of a plane shock wave at a free plane ga...

A non-equilibrium molecular dynamics method is employed to study the mechanical response of soda-lime glass (a material commonly used in transparent armor applications) when subjected to the loading conditions associated with the generation and propagation of planar shock waves. Specific attention is given to the identification and characterization of various (inelastic-deformation and energy-d...

Abstract The dynamics of a transonic buffet flow on the suction side highly loaded 2-D compressor blade model is investigated at chord-based Reynolds number $$1.4 \times 10^6$$ 1.4×106 and an inlet Mach 1.05. Near stall...

A Bose-Einstein condensate (BEC) is a quantum fluid that gives rise to interesting shock wave nonlinear dynamics. Experiments depict a BEC that exhibits behavior similar to that of a shock wave in a compressible gas, eg. traveling fronts with steep gradients. However, the governing Gross-Pitaevskii (GP) equation that describes the mean field of a BEC admits no dissipation hence classical dissip...

background: cholera, an infectious disease caused by vibrio cholerae , is primarily transmitted by ingestion of contaminated food or water. in severe cases, cholera may lead to severe dehydration, metabolic acidosis, and ultimately, hypovolemic shock and death.   methods: in this study v.cholerae non-o1 was cultured in suitable media. lps was extracted from the surface of  bacteria by hot pheno...