4,746 research outputs found
COHORT ANALYSIS OF FOOD CONSUMPTION: A CASE OF RAPIDLY CHANGING JAPANESE CONSUMPTION
Food Consumption/Nutrition/Food Safety,
Lightweight pressurization system for the Apollo service propulsion system Final report
Lightweight cryogenic He cascade pressurization concept for Apollo service propulsion syste
Observations on the vibration of axially-tensioned elastomeric pipes conveying fluids
A study of the effect of axial tension on the vibration of a single-span elastomeric pipe clamped at both ends conveying fluid has been carried out both experimentally and theoretically. A new mathematical model using a penalty function technique and the method of kinematic correction and fictitious loads has been developed. The influence of flowing fluid and axial tension on natural frequencies and mode shapes of the system has been described using this model and compared with experimental observations. Linear and non-linear dynamic response of the harmonically excited pipe has also been investigated for varying flow velocities and initial axial tensions
Benchmarking high fidelity single-shot readout of semiconductor qubits
Determination of qubit initialisation and measurement fidelity is important
for the overall performance of a quantum computer. However, the method by which
it is calculated in semiconductor qubits varies between experiments. In this
paper we present a full theoretical analysis of electronic single-shot readout
and describe critical parameters to achieve high fidelity readout. In
particular, we derive a model for energy selective state readout based on a
charge detector response and examine how to optimise the fidelity by choosing
correct experimental parameters. Although we focus on single electron spin
readout, the theory presented can be applied to other electronic readout
techniques in semiconductors that use a reservoir.Comment: 19 pages, 8 figure
Orbital assembly and maintenance study
The requirements, conceptual design, tradeoffs, procedures, and techniques for orbital assembly of the support structure of the microwave power transmission system and the radio astronomy telescope are described. Thermal and stress analyses, packaging, alignment, and subsystems requirements are included along with manned vs. automated and transportation tradeoffs. Technical and operational concepts for the manned and automated maintenance of satellites were investigated and further developed results are presented
Orbital assembly and maintenance study. Executive summary
A sound, practical approach for the assembly and maintenance of very large structures in space is presented. The methods and approaches for assembling two large structures are examined. The maintenance objectives include the investigation of methods to maintain five geosynchronous satellites. The two assembly examples are a 200-meter-diameter radio astronomy telescope and a 1,000-meter-diameter microwave power transmission system. The radio astronomy telescope operates at an 8,000-mile altitude and receives RF signals from space. The microwave power transmission system is part of a solar power satellite that will be used to transmit converted solar energy to microwave ground receivers. Illustrations are included
Charge-qubit operation of an isolated double quantum dot
We have investigated coherent time evolution of pseudo-molecular states of an
isolated (leadless) silicon double quantum-dot, where operations are carried
out via capacitively-coupled elements. Manipulation is performed by short
pulses applied to a nearby gate, and measurement is performed by a
single-electron transistor. The electrical isolation of this qubit results in a
significantly longer coherence time than previous reports for semiconductor
charge qubits realized in artificial molecules.Comment: 4 journal pages, 4 figures, Lette
Techniques for Consecutive TEM and Atom Probe Tomography Analysis of Nanowires
Nanowires show great promise for development in many technological applications including electronics, photonics, and displays . Due to the fine scale of nanowires, transmission electron microscopy (TEM) and atom probe tomography (APT) are among a limited number of techniques that can measure the crystallographic and chemical nature of these structures which ultimately define their performance
Techniques for Consecutive TEM and Atom Probe Tomography Analysis of Nanowires
Nanowires show great promise for development in many technological applications including electronics, photonics, and displays . Due to the fine scale of nanowires, transmission electron microscopy (TEM) and atom probe tomography (APT) are among a limited number of techniques that can measure the crystallographic and chemical nature of these structures which ultimately define their performance
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