83,633 research outputs found
The application of high temperature superconducting materials to power switches
No full textSuperconducting switches may nd application in superconducting magnet systems that
require energy extraction. Such superconducting switches could be bypass-switches that
are operated in conjunction with a parallel resistor or dump-switches where all of the
energy is dissipated in the switch itself. Bypass-switches are more suited to higher energy
circuits as a portion of the energy can be dissipated in the external dump resistor. Dump-switches
require less material and triggering energy as a lower switch resistance is needed
to achieve the required total dump resistance.Both superconducting bypass-switches and superconducting dump-switches can be thermally
activated. Switching times that are comparable to those obtained with mechanical
bypass-switch systems can be achieved using a co-wound heater that is powered by a capacitor
discharge. Switches that have fast thermal diffusion times through the insulation
can be modelled as a lumped system whereas those with slow thermal diffusion times were
modelled with the full heat diffusion equation.Superconducting switches can be formed of either high temperature superconductors
(HTS) or low temperature superconductors (LTS). Switches based on HTS materials allow
operation at higher temperatures where the cost of cooling is less. Extracting the magnet
energy and depositing the heater energy at higher temperatures will also reduce the load on
the overall cryogenic system during switching and energy extraction. For magnet circuits
that are based on high temperature superconductors the switch must also be formed of
HTS material. Due to the approximately T3 dependence of specific heat capacity, switches
that operate at higher temperatures have slower heat diffusion times and require higher
triggering energies than those operating at low temperature. HTS based dump-switches
and HTS based bypass-switches were tested in liquid nitrogen to show that the required
switching time could be achieved at these high temperatures.The design and optimisation of superconducting switches that were formed of various
superconducting materials were performed for example magnet circuits to provide reference
designs of switches. These example circuits were based on selected Large Hadron Collider
600 A circuits that had a stored energy of 5.5 kJ. Superconducting switches may also nd
application in magnet circuits with higher transport currents and higher energies. The
scaling and suitability of the reference designs to higher energy circuits was also described
Two new species and one new variety of Mimosa sect. Habbasia (Leguminosae: Mimosoideae) from central Brazil
No full textTwo new species, Mimosa myrioglandulosa V. F. Dutra & F. C. P. Garcia and M. trinerva V. F. Dutra & F. C. P. Garcia, and one new variety M. foliolosa Benth. var. grandibractea V. F. Dutra & F. C. P. Garcia, of Mimosa sect. Habbasia (Leguminosae, Mimosoideae) from the rocky fields of the state of Minas Gerais, Brazil, are described and illustrated. M. myrioglandulosa resembles M. maguirei Barneby, but differs because it has stems with sessile glands. M. trinerva is vegetatively similar to M. albolanata Taub. var. paucipinna (Benth.) Barneby, but has corolla lobes with 2 – 3 nerves. M. foliolosa var. grandibractea is similar to M. foliolosa var. brevibractea Barneby, but has larger bracts. Discussions about the distribution, habitat, phenology, conservation status, etymology, similar species and an analytical key to morphologically related species are provided
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Passive, invasive, and duplicitous: Three forms of intimate partner cyberstalking
No full textIntimate partners are common targets of cyberstalking, yet despite the negative impact the behavior remains largely underexplored. In the present study, we explore behavioral methods adopted to cyberstalk intimate partners. Participants (N = 449, 50.1% men) recruited via Amazon's Mechanical Turk completed an online questionnaire and we assessed a range of intimate partner cyberstalking behaviors across mating contexts (i.e., short-term v long-term relationships) and goals (i.e., mate retention v mate attainment). These cyberstalking behaviors were factor analyzed (i.e., Exploratory Factor Analysis) and reduced to reveal three dimensions: Passive, invasive, and duplicitous. Both men and women largely engage in passive cyberstalking, though women perpetrated more overall, passive, and invasive intimate partner cyberstalking. Women were also likely to adopt invasive behaviors to retain a long-term mate and attain a short-term mate. We also examined associations between the Dark Tetrad traits, social motives, and cyberstalking. All Dark Tetrad traits were associated with more overall cyberstalking but demonstrated differential patterns across the three forms, substantiating a dimensional conceptualization of this online behavior. Results of the current study contribute to establishing a theoretical framework to understand perpetration of intimate partner cyberstalking, ultimately contributing to managing the potentially harmful online behavior
Illuminaçao Apologetica do retrato de Morteçor en que aparecem com mais vivas côres os erros do author do novo Methodo, e seu Apologista ...
No full textFecha sacada de la pág.2 y 159Sign.: A-V\p4\sError tipográfico de signatura : a B\b2\s llama B\b3\
[Report to W. P. Gannaway by V. J. Brian and T. T. Wardlaw, March 9, 1964]
No full textCriminal intelligence report addressed to Captain W. P. Gannaway of the Special Service Bureau in Dallas, Texas. The report, which was submitted by detectives V. J. Brian and T. T. Wardlaw, states that Edward Tieman and his wife were picketing the Dallas County Courthouse on March 9th, 1964. Tieman carried a sign which read "Jesus Christ and the Holy Bible everyone's hope," while his wife carried a sign which read "Psychiatry is not the hope of killers. It tries to mock God and our nation's laws.
World War I record of service survey for Robert P. Kilner, signed 8 March 1926
No full textQuestionnaire about Robert Pettes Kilner's service in World War I, 1917-1919, signed by Kilner on 8 March 1926.Questionnaire originally part of a survey of Norwich University alumni conducted by a “Norwich in the World War” committee consisting of Charles N. Barber (chairman), Carl V. Woodbury, K.R.B. Flint, and Gustaf A. Nelson. Data from these questionnaires may have been used in a chapter of "Vermont in the world war, 1917-1919" by Harold P. Sheldon (1928)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Universal Statistical Properties of Inertial-particle Trajectories in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence
No full textWe obtain new universal statistical properties of heavy-particle trajectories in three-dimensional, statistically steady, homogeneous, and isotropic turbulent flows by direct numerical simulations. We show that the probability distribution functions (PDFs) P(Φ), of the angle Φ between the Eulerian velocity u and the particle velocity v, at a point and time, scales as P(Φ) ∼Φ−, with a new universal exponent ≃ 4
World War I record of service survey for George P. Lewis, signed 8 March 1926.
No full textQuestionnaire about George Parker Lewis' service in World War I, 1917-1919, signed by Lewis on 8 March 1926.Questionnaire originally part of a survey of Norwich University alumni conducted by a “Norwich in the World War” committee consisting of Charles N. Barber (chairman), Carl V. Woodbury, K.R.B. Flint, and Gustaf A. Nelson. Data from these questionnaires may have been used in a chapter of "Vermont in the world war, 1917-1919" by Harold P. Sheldon (1928)
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