3,244 research outputs found
Less now or more later?:Essays on the measurement of time preferences in economic experiments
Deuteron Dipole Polarizabilities and Sum Rules
The scalar, vector, and tensor components of the (generalized) deuteron
electric polarizability are calculated, as well as their logarithmic
modifications. Several of these quantities arise in the treatment of the
nuclear corrections to the deuterium Lamb shift and the deuterium hyperfine
structure. A variety of second-generation potential models are used and a
(subjective) error is assigned to the calculations. The zero-range
approximation is used to analyze a subset of the results, and a simple
relativistic version of this approximation is developed.Comment: 14 pages, LaTex - submitted to Physical Review
The nucleon-sigma coupling constant in QCD Sum Rules
The external-field QCD Sum Rules method is used to evaluate the coupling
constant of the light isoscalar-scalar meson (``'' or \epsilon) to the
nucleon. The contributions that come from the excited nucleon states and the
response of the continuum threshold to the external field are calculated. The
obtained value of the coupling constant is compatible with the large value
required in one-boson exchange potential models of the two-nucleon interaction.Comment: 11 pages, 4 figure
Discrepancy between otolith and tag-recovery estimates of growth for two South African surf-zone teleost species
Growth rates determined from recovered tagged galjoen Dichistius capensis and white steenbras Lithognathus lithognathus were compared to predictions from growth models based on otolith ring counts. Galjoen could notbe sexed externally, but it was assumed that all fish >450 mm total length were females, which grow faster than males. Those smaller than this were assumed to include mostly males and were treated as a “male” sample. Maleand female white steenbras grow equivalently. Tagged “male” (n = 322), and female galjoen (n = 34) and white steenbras (n = 14) grew more slowly than the model predictions. The discrepancy is likely attributable to the physiological effect of external tags on growth
Use of blood lactate concentration as a marker of training status
The recent development of portable blood lactate analysers has made it relatively easy to test blood lactate concentration in the field. This paper discusses the validity and accuracy of measuring blood lactate concentration as a marker of training status or exercise intensity and examines the assumptions upon which the above practice is based. The mechanisms responsible for blood lactate accumulation according to different theories are discussed, followed by a review of the literature regarding the measurement, tracking and interpretation of blood lactate concentration. The use of blood lactate concentration to monitor either training status or intensity is complicated by the inaccuracy of portable lactate analysers, multiple confounding factors affecting blood lactate concentration such as carbohydrate depletion, mode of exercise, ambient temperature, muscle damage and overtraining and difficulty in interpreting the results. The relationship between changes in blood lactate concentration following training and subsequent performance in competition has not been convincingly established. Therefore it may be concluded that changes in blood lactate concentration should be interpreted with caution as the changes do not track training status or exercise intensity with sufficient precision to have a practical application
Be Patient When Measuring Hyperbolic Discounting: Stationarity, Time Consistency and Time Invariance in a Field Experiment
Lecturer conceptions of and approaches to decolonisation of curricula
This report forms part of a larger project that investigated lecturer and student conceptions of decolonisation and decolonisation of curricula at subject level in a South African higher education institution. The study adopted an interpretive paradigm and an on-line questionnaire was administered to all the lecturers in a Faculty of Education in the Western Cape. A de-colonial perspective was used as a lens to interpret the data. In general, participants viewed decolonisation as a worthwhile project that can contribute to the development of a socially-just post-colonial and post-apartheid society. Consistent with the fact that knowledge is created differently in different subjects, the findings revealed varied conceptions of and approaches to the decolonisation of curricula among academics. The study concludes that decolonisation is a complex and multi-layered concept. However. if there are shared understandings of what decolonisation of curricula entails in the different disciplines, and consultative, participatory multi-disciplinary/trans-disciplinary approaches to decolonisation are adopted, significant progress will be made in achieving the goal of decolonising university curricula
An interacting quark-diquark model of baryons
A simple quark-diquark model of baryons with direct and exchange interactions
is constructed. Spectrum and form factors are calculated and compared with
experimental data. Advantages and disadvantages of the model are discussed.Comment: 13 pages, 3 eps-figures, accepted by Phys.Rev. C Rapid Communication
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The Learnability of the Wh-Island Constraint in Dutch by a Long Short-Term Memory Network
The current study investigates whether a Long Short-Term Memory (LSTM) network can learn the wh-island constraint in Dutch in a way comparable to human native speakers. After establishing with an acceptability judgement task that native speakers demonstrate a clear sensitivity to wh-island violations, the LSTM network was tested on the same sentences. Contrary to the results of the native speakers, the network was not able to recognize wh-islands and to block gap expectancies within them. This suggests that input and the network’s inductive biases alone might not be enough to learn about syntactic island constraints, and that built-in language knowledge or abilities might be necessary
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