33,282 research outputs found
Subminiature micropower digital recorder
High-density digital data, collected periodically or randomly from multiplicity of sensors, are recorded by subminiature recorder. Magnetic recording head is energized with suitable pulsatile signals to reverse polarization on magnetically-sensitive tape while tape is immobilized at recording head. Prior to next recording, set tape so new area of tape is at recording head
Research in life sciences instrumentation pertinent to studies in space biology Quarterly progress report, 1 Apr. - 30 Jun. 1967
Brain probes, multichannel telemetry devices, and telemetric brain temperature sensors for space biology studie
Competition Between T=0 and T=1 Pairing in Proton-Rich Nuclei
A cranked mean-field model with two-body T=1 and T=0 pairing interactions is
presented. Approximate projection onto good particle-number is enforced via an
extended Lipkin-Nogami scheme. Our calculations suggest the simultaneous
presence of both T=0 and T=1 pairing modes in N=Z nuclei. The transitions
between different pairing phases are discussed as a function of neutron/proton
excess, T, and rotational frequency, . The additional binding
energy due to the T=0 -pairing correlations, is suggested as a possible
microscopic explanation of the Wigner energy term in even-even nuclei.Comment: 8 RevTeX pages, 3 uuencoded POSTSCRIPT figures include
Recommended from our members
Mental Health of Children and Young People in England, 2017: Trends and characteristics
This survey series provides England’s best source of data on trends in child mental health. Emotional, behavioural, hyperactivity, and other types of mental disorder were assessed in 5 to 15 year olds in 1999, 5 to 16 year olds in 2004, and 5 to 19 year olds in 2017.
One in eight (12.8%) 5 to 19 year olds had a mental disorder when assessed in 2017. Rates were similar in boys and girls. Data for 5 to 15 year olds show a slight upward trend over time in the prevalence of emotional disorders.Rates for behavioural, hyperactivity and other disorders have remained broadly stable
Test results from a dynamic model dynaflex rotor
A one-fifth scale dynamic model of the Sikorsky Dynaflex rotor was tested in hover and in forward flight conditions in a wind tunnel. The Dynaflex rotor features an advanced composite structure which flexes to provide a constant speed universal joint action. Testing concentrated on confirming that the stability and dynamic response of the rotor were satisfactory. Lift conditions of up to .11 Ct/sigma and advance ratios as high as .46 were reached. Vibratory loads were compared to those of articulated rotors. The Dynaflex rotor concept appears to be a practical concept from the standpoint of dynamic response and stability
Modeling material failure with a vectorized routine
The computational aspects of modelling material failure in structural wood members are presented with particular reference to vector processing aspects. Wood members are considered to be highly orthotropic, inhomogeneous, and discontinuous due to the complex microstructure of wood material and the presence of natural growth characteristics such as knots, cracks and cross grain in wood members. The simulation of strength behavior of wood members is accomplished through the use of a special purpose finite element/fracture mechanics routine, program STARW (Strength Analysis Routine for Wood). Program STARW employs quadratic finite elements combined with singular crack tip elements in a finite element mesh. Vector processing techniques are employed in mesh generation, stiffness matrix formation, simultaneous equation solution, and material failure calculations. The paper addresses these techniques along with the time and effort requirements needed to convert existing finite element code to a vectorized version. Comparisons in execution time between vectorized and nonvectorized routines are provided
Space related biological and information studies Annual report, Mar. 1968 - Mar. 1969
Space related biotelemetry research - multichannel implantable telemeter, subcarrier oscillator, and ion concentration transducer
Space and related biological and instrumentation studies
Research and experimental effort was carried out on high-density photo-optical recorder design, implantable pH electrodes and the mangetic/doppler blood-flow sensor
- …