1,232 research outputs found
Low distortion automatic phase control circuit
A voltage controlled phase shifter is rendered substantially harmonic distortion free over a large dynamic input range by employing two oppositely poled, equally biased varactor diodes as the voltage controlled elements which adjust the phase shift. Control voltages which affect the bias of both diodes equally are used to adjust the phase shift without increasing distortion. A feedback stabilized phase shifter is rendered substantially frequency independent by employing a phase detector to control the phase shift of the voltage controlled phase shifter
Low distortion automatic phase control circuit
Circuit for generation and demodulation of quadrature double side band signals in frequency division multiplexing system is described. Circuit is designed to produce low distortion automatic phase control. Illustration of circuit and components is included
F-8C digital CCV flight control laws
A set of digital flight control laws were designed for the NASA F-8C digital fly-by-wire aircraft. The control laws emphasize Control Configured Vehicle (CCV) benefits. Specific pitch axis objectives were improved handling qualities, angle-of-attack limiting, gust alleviation, drag reduction in steady and maneuvering flight, and a capability to fly with reduced static stability. The lateral-directional design objectives were improved Dutch roll damping and turn coordination over a wide range in angle-of-attack. An overall program objective was to explore the use of modern control design methodilogy to achieve these specific CCV benefits. Tests for verifying system integrity, an experimental design for handling qualities evaluation, and recommended flight test investigations were specified
The Turtle Head Immobilization System (THIS): A Tool for Faster and Safer Handling and Processing of Aggressive Turtle Species
The turtle head immobilization tool (THIS) is an efficient and cost effective tool to aid in the processing of large, aggressive turtles such as the Eastern Snapping Turtle (Chelydra serpentina). THIS aids in the reduction of aggressive behaviors by calming the animal during processing and minimizing injuries to the turtle and handlers. This simple tool also streamlines the processing itself, by allowing researchers to focus on measurements and markings, instead of having to maintain the constant vigilance often needed to work safely around these animals
The Turtle Head Immobilization System (THIS): A Tool for Faster and Safer Handling and Processing of Aggressive Turtle Species
The turtle head immobilization tool (THIS) is an efficient and cost effective tool to aid in the processing of large, aggressive turtles such as the Eastern Snapping Turtle (Chelydra serpentina). THIS aids in the reduction of aggressive behaviors by calming the animal during processing and minimizing injuries to the turtle and handlers. This simple tool also streamlines the processing itself, by allowing researchers to focus on measurements and markings, instead of having to maintain the constant vigilance often needed to work safely around these animals
Wave attenuation to clock sojourn times
The subject of time in quantum mechanics is of perennial interest especially
because there is no observable for the time taken by a particle to transmit (or
reflect) from a particular region. Several methods have been proposed based on
scattering phase shifts and using different quantum clocks, where the time
taken is clocked by some external input or indirectly from the phase of the
scattering amplitudes. In this work we give a general method for calculating
conditional sojourn times based on wave attenuation. In this approach clock
mechanism does not couple to the Hamiltonian of the system. For simplicity,
specific case of a delta dimer is considered in detail. Our analysis re-affirms
recent results based on correcting quantum clocks using optical potential
methods, albeit in a much simpler way.Comment: 4 pages, 5 figures. Minor corrections made and journal reference
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Number-of-Particle Fluctuations and Stability of Bose-Condensed Systems
In this paper we show that a normal total number-of-particle fluctuation can
be obtained consistently from the static thermodynamic relation and dynamic
compressibility sum rule. In models using the broken U(1) gauge symmetry, in
order to keep the consistency between statics and dynamics, it is important to
identify the equilibrium state of the system with which the density response
function is calculated, so that the condensate particle number , the
number of thermal depletion particles , and the number of
non-condensate particles can be unambiguously defined. We also show
that the chemical potential determined from the Hugenholtz-Pines theorem should
be consistent with that determined from the equilibrium equation of state. The
anomalous fluctuation of the number of non-condensate particles is an
intrinsic feature of the broken U(1) gauge symmetry. However, this anomalous
fluctuation does not imply the instability of the system. Using the random
phase approximation, which preserves the U(1) gauge symmetry, such an anomalous
fluctuation of the number of non-condensate particles is completely absentComment: 9 pages, submitted to PR
Sickness absence around contact with outpatient mental health care services – differences between migrants and non-migrants:a Norwegian register study
Background: Mental disorders are a leading cause of sickness absence. Some groups of migrants are at higher risk of both mental disorder and sickness absence. Yet, research on sickness absence in relation to mental disorders among migrants is limited. This study investigates differences in sickness absence in the twelve-month period around contact with outpatient mental health services between non-migrants and various migrant groups with different length of stays. It also considers whether these differences are similar for men and women.Methods: Using linked Norwegian register data, we followed 146,785 individuals, aged 18–66 years, who had attended outpatient mental health services and who had, or had recently had, a stable workforce attachment. The number of days of sickness absence was calculated for the 12-month period surrounding contact with outpatient mental health services. We applied logistic regression and zero-truncated negative binomial regression to assess differences in any sickness absence and number of days of absence between non-migrants and migrants, including refugees and non-refugees. We included interaction terms between migrant category and sex.Results: Refugee men and other migrant men from countries outside the European Economic Area (EEA) had a higher probability of any sickness absence in the period surrounding contact with outpatient mental health services than their non-migrant counterparts. Women from EEA countries with stays of less than 15 years had a lower probability than non-migrant women. Additionally, refugees, both men and women, with 6–14 years in Norway had more days of absence while EEA migrants had fewer days than their non-migrant counterparts.Conclusions: Refugee men and other non-EEA migrant men appear to have higher sickness absence than non-migrant men around the time of contact with services. This finding does not apply to women. Several probable reasons for this are discussed, though further research is required to understand why. Targeted strategies to reduce sickness absence and support the return to work for refugees and other non-EEA migrant men are needed. Barriers to timely help-seeking should also be addressed.</p
Anomalous heat conduction and anomalous diffusion in nonlinear lattices, single walled nanotubes, and billiard gas channels
We study anomalous heat conduction and anomalous diffusion in low dimensional
systems ranging from nonlinear lattices, single walled carbon nanotubes, to
billiard gas channels. We find that in all discussed systems, the anomalous
heat conductivity can be connected with the anomalous diffusion, namely, if
energy diffusion is , then the thermal conductivity can be expressed in terms of the system size
as with . This result predicts that
a normal diffusion () implies a normal heat conduction obeying the
Fourier law (), a superdiffusion () implies an anomalous
heat conduction with a divergent thermal conductivity (), and more
interestingly, a subdiffusion () implies an anomalous heat
conduction with a convergent thermal conductivity (), consequently,
the system is a thermal insulator in the thermodynamic limit. Existing
numerical data support our theoretical prediction.Comment: 15 Revtex pages, 16 figures. Invited article for CHAOS focus issue
commemorating the 50th anniversary of the Fermi-Pasta-Ulam (FPU) mode
Stability of 1-D Excitons in Carbon Nanotubes under High Laser Excitations
Through ultrafast pump-probe spectroscopy with intense pump pulses and a wide
continuum probe, we show that interband exciton peaks in single-walled carbon
nanotubes (SWNTs) are extremely stable under high laser excitations. Estimates
of the initial densities of excitons from the excitation conditions, combined
with recent theoretical calculations of exciton Bohr radii for SWNTs, suggest
that their positions do not change at all even near the Mott density. In
addition, we found that the presence of lowest-subband excitons broadens all
absorption peaks, including those in the second-subband range, which provides a
consistent explanation for the complex spectral dependence of pump-probe
signals reported for SWNTs.Comment: 4 pages, 4 figure
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