2,359 research outputs found
Reactive attachment disorder in the general population: a hidden ESSENCE disorder
Reactive attachment disorder (RAD) is a severe disorder of social functioning. Previous research has shown that children with RAD may have poor cognitive and language abilities; however, findings mainly come from biased, institutionalised samples. This paper describes the characteristics of all children who were given a suspected or likely diagnosis of reactive attachment disorder in an epidemiological study of approximately 1,600 children investigating the prevalence of RAD in the general population. We found that children with RAD are more likely to have multiple comorbidities with other disorders, lower IQs than population norms, more disorganised attachment, more problem behaviours, and poorer social skills than would be found in the general population and therefore have a complex presentation than can be described as ESSENCE. We discuss the clinical and educational implications
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"With the Richness of Their Resources”: Honors Alumni Reflect on the Impact of a Service-Learning and Mentoring Program
Scholars have encouraged universities to more effectively engage with surrounding communities. One example of community engagement is the service-learning partnership between the Plan II Honors Program and the Knowledge is Power Program (KIPP) public charter school in Austin, through which college students enroll in a class to mentor local middle school students. In this article, we examine qualitative survey responses from Plan II alumni over a seven-year period reflecting on their experiences. Alumni described the service-learning experience as influencing their academic careers, postgraduate plans, and personal views. Findings imply that structured service-learning experiences can significantly influence the behaviors and life decisions of alumni both at the time of their experience and well beyond.Educatio
MODELING PRICE IMPACTS OF BACKWARD VERTICAL INTEGRATION IN THE US PORK INDUSTRY
The U.S. pork sector is evolving from an industry of small, independent firms vertically linked by spot markets to one of substantially larger firms vertically connected through contractual agreements and integration. Potential benefits to this tighter vertical arrangement include lower consumer pork prices, although the true nature of this benefit is still under debate. At the same time, there is concern of market foreclosure because highly vertically integrated industry may prevent independent hog producers from having access to open markets in which to sell their output. The objective of this paper is to develop an econometric model to estimate the extent of backward integration by pork processing firms into the upstream hog production stage, taking into account the oligopsonistic nature of the processors, and to simulate the effect of vertical integration on consumer and producer prices and welfare.backward vertical integration, oligopsony, pork, Industrial Organization, Livestock Production/Industries,
Randomized Benchmarking as Convolution: Fourier Analysis of Gate Dependent Errors
We provide an alternative proof of Wallman's [Quantum 2, 47 (2018)] and
Proctor's [Phys. Rev. Lett. 119, 130502 (2017)] bounds on the effect of
gate-dependent noise on randomized benchmarking (RB). Our primary insight is
that a RB sequence is a convolution amenable to Fourier space analysis, and we
adopt the mathematical framework of Fourier transforms of matrix-valued
functions on groups established in recent work from Gowers and Hatami [Sbornik:
Mathematics 208, 1784 (2017)]. We show explicitly that as long as our faulty
gate-set is close to some representation of the Clifford group, an RB sequence
is described by the exponential decay of a process that has exactly two
eigenvalues close to one and the rest close to zero. This framework also allows
us to construct a gauge in which the average gate-set error is a depolarizing
channel parameterized by the RB decay rates, as well as a gauge which maximizes
the fidelity with respect to the ideal gate-set
Nanomechanical Quantum Memory for Superconducting Qubits
Many protocols for quantum computation require a quantum memory element to
store qubits. We discuss the accuracy with which quantum states prepared in a
Josephson junction qubit can be stored in a nanoelectromechanical resonator and
then transfered back to the junction. We find that the fidelity of the memory
operation depends on both the junction-resonator coupling strength and the
location of the state on the Bloch sphere. Although we specifically focus on a
large-area, current-biased Josesphson junction phase qubit coupled to the
dilatational mode of a piezoelectric nanoelectromechanical disk resonator, many
our results will apply to other qubit-oscillator models.Comment: 4 pages, Revte
Minnesota Agricultural Economist 689
Livestock Production/Industries, Marketing,
Dependence of CMI Growth Rates on Electron Velocity Distributions and Perturbation by Solitary Waves
We calculate growth rates and corresponding gains for RX and LO mode
radiation associated with the cyclotron maser instability for parameterized
horseshoe electron velocity distributions. The velocity distribution function
was modeled to closely fit the electron distribution functions observed in the
auroral cavity. We systematically varied the model parameters as well as the
propagation direction to study the dependence of growth rates on model
parameters. The growth rate depends strongly on loss cone opening angle, which
must be less than for significant CMI growth. The growth rate is
sharply peaked for perpendicular radiation (), with a
full-width at half-maximum , in good agreement with observed k-vector
orientations and numerical simulations. The fractional bandwidth varied between
10 and 10, depending most strongly on propagation direction. This
range encompasses nearly all observed fractional AKR burst bandwidths. We find
excellent agreement between the computed RX mode emergent intensities and
observed AKR intensities assuming convective growth length 20-40 km
and group speed 0.15. The only computed LO mode growth rates compatible
observed LO mode radiation levels occurred for number densities more than 100
times the average energetic electron densities measured in auroral cavities.
This implies that LO mode radiation is not produced directly by the CMI
mechanism but more likely results from mode conversion of RX mode radiation. We
find that perturbation of the model velocity distribution by large ion solitary
waves (ion holes) can enhance the growth rate by a factor of 2-4. This will
result in a gain enhancement more than 40 dB depending on the convective growth
length within the structure. Similar enhancements may be caused by EMIC waves.Comment: 21 pages, 11 figures. J. Geophys. Res. 2007 (accepted
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