3,302 research outputs found
A study of methods of prediction and measurement of the transmission of sound through the walls of light aircraft
The acoustic intensity technique was applied to the sound transmission loss of panel structures (single, composite, and stiffened). A theoretical model of sound transmission through a cylindrical shell is presented
Irritable bowel syndrome : Reply
In reply to a letter to the Editor, original article Crocker K, Chur-Hansen A, Andrews J. Interpersonal relationships for patients with irritable bowel syndrome: A qualitative study of gps' perceptions Australian Family Physician 42(11):805-810 2013Katie Crocker, Anna Chur-Hansen, Jane Andrew
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Modeling of Selective Area Laser Deposition Vapor Infiltration (SALDVI) of Silicon Carbide
Selective Area Laser Deposition Vapor Infiltration (SALDVI) is a developing
solid freeform fabrication (SFF) technique in which porous layers of powder are
densified by infiltrating the pore spaces with solid material deposited from a gas
precursor during laser heating. A 3D finite element model was developed that simulates
SALDVI of silicon carbide. The model predicts the laser input power and the distribution
of vapor deposited SiC within the powder bed as well as on the surface of the powder bed
(SALD). The model considers a moving Gaussian distribution laser beam, temperatureand porous-dependent thermal conductivity, specific heat and temperature-dependent
deposition rate. Furthermore, the model also includes closed-loop control of the laser
power to achieve a desired target processing temperature on the top surface of the power
bed. The simulation results agree fairly well with experimental data for simple
geometries and offer guidelines for further experimental studies of the SALDVI process.Mechanical Engineerin
Microrheology probes length scale dependent rheology
We exploit the power of microrheology to measure the viscoelasticity of entangled F-actin solutions at different length scales from 1 to 100 mu m over a wide frequency range. We compare the behavior of single probe-particle motion to that of the correlated motion of two particles. By varying the average length of the filaments, we identify fluctuations that dissipate diffusively over the filament length. These provide an important relaxation mechanism of the elasticity between 0.1 and 30 rad/sec
Light aircraft sound transmission study
The revived interest in the design of propeller driven aircraft is based on increasing fuel prices as well as on the need for bigger short haul and commuter aircraft. A major problem encountered with propeller driven aircraft is propeller and exhaust noise that is transmitted through the fuselage sidewall structure. Part of the work which was conducted during the period April 1 to August 31, 1983, on the studies of sound transmission through light aircraft walls is presented
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