Reports on infectious diseases acquired by bacteriological laboratory staff from their work emphasize the risk of contracting tuberculosis by handling tuberculous specimens. Recent advances in the chemotherapy of tuberculosis have greatly increased the amount of bacteriology done in routine hospital laboratories, primary culture and then sensitivity tests being required where previously a direc...

A series of centrifuge liquefaction tests have been conducted at C-CORE’s geotechnical centrifuge facility: two on variable soil and one on uniform soil deposits. A single storied frame structure resting on two strip footings was also placed on that soil deposit. Experimental results such as accelerations, excess pore water pressures (EPWP) and settlements were monitored throughout the tests. R...

Liquefaction-induced lateral spreading causes severe damage to the pile foundation of structures. Old structures that are not properly designed for liquefaction more vulnerable a strong earthquake. Many old piled abutments require remedial measure against spreading. This paper examines responses an abutment subjected liquefaction-induced and efficacy sheet reinforcement technique mitigate assoc...

Respiratory Sinus Arrhythmia (RSA), usually the high frequency (HF) component of heart rate variability (HRV), is a cardiorespiratory interaction mediated by the vagus nerve. RSA is thus considered a marker of the parasympathetic modulation of heart rate. Previous studies reported decrease in RSA after spaceflight. Whether this can be due to autonomic adaption to microgravity or only result fro...

The conceptual design and application of a low-speed centrifuge for carrying out milli to micro-G gravity experiments to simulate the granular nature of the surface and interiors of asteroids and comets is described. The proposed device is well suited for the Human-Tended Suborbital Science program as its 3-5 minute weightless durations are sufficient to successfully simulate the surfaces and i...

Experimental Section Cross-polarised optical microscopy was performed using an Olympus BH-2 microscope coupled to a Leica DM-IRB digital camera. The gel samples were sealed two glass plates using vacuum grease to enable aging observations. Small angle X-ray scattering (SAXS) experiments were performed using a rotating anode with a copper target (λ = 1.54 Å). The distance between the sample and ...

This article gives a historical and technical review of the U.S. gas centrifuge efforts between 1934 and 1985. The first section tells of how the United States initially led in centrifuge design, only to abandon the still-immature technology in the midst of the Manhattan Project. While interest in the technology continued in Europe, the United States decided that centrifuges were not a viable a...

Ultracentrifugation for determination of isotropic concentrations of fatty acids is widely used. However, several artifacts, which would affect the isotropic concentration, could occur if care is not taken. These include sedimentation of micelles, incomplete flotation of unsolubilized oil, and uptake of labeled fatty acid by the walls of centrifuge tubes. The first artifact can be overcome by s...

We describe two experiments performed on a 9-m-radius geotechnical centrifuge to evaluate dynamic soil–structure interaction effects the cyclic failure potential of fine-grained soil. Each experiment incorporated three different structures with range mass and stiffness properties. Structures were founded strip footings embedded in thin layer sand overlying lightly overconsolidated low-plasticit...

In the event of earthquake-induced liquefaction, structures with shallow foundations can suffer excessive settlement and rotation. this paper, rotational response resting on liquefiable layers thickness equal to or smaller than width foundation is examined through a series dynamic centrifuge experiments. Moment–rotation backbone curves are extracted corresponding evolution rocking stiffness inc...