1,112 research outputs found
Chemical Treatment Methods Pilot (CTMP) System for Treatment of Urban Runoff â Phase I. Feasibility and Design
(pdf contains 418 pages
Bell's inequalities for states with positive partial transpose
We study violations of n particle Bell inequalities (as developed by Mermin
and Klyshko) under the assumption that suitable partial transposes of the
density operator are positive. If all transposes with respect to a partition of
the system into p subsystems are positive, the best upper bound on the
violation is 2^((n-p)/2). In particular, if the partial transposes with respect
to all subsystems are positive, the inequalities are satisfied. This is
supporting evidence for a recent conjecture by Peres that positivity of partial
transposes could be equivalent to existence of local classical models.Comment: 4 pages, REVTe
Evaluation of non-chemical seed treatment methods for the control of Alternaria dauci and A. radicina on carrot seeds
The current study was initiated to evaluate the efficacy of physical methods (hot water, aerated steam, electron treatment) and agents of natural origin (resistance inducers, plant derived products, micro-organisms) as seed treatments of carrots for control of Alternaria dauci and A. radicina. Control of both Alternaria species by seed treatment with the resistance inducers was generally poor. Results were also not satisfactory with most of the formulated commercial micro-organism preparations. Based on the average of five field trials, one of these, BA 2552 (Pseudomonas chlororaphis), provided a low but significant increase in plant stand. Among the experimental micro-organisms, the best results were obtained with Pseudomonas sp. strain MF 416 and Clonostachys rosea strain IK726. A similar level of efficacy was provided by seed treatment with an emulsion (1%) of thyme oil in water. Good and consistent control was generally achieved with the physical methods aerated steam, hot water and electron treatment. Aerated steam treatment was, apart from the thiram-containing chemical standard, the best single treatment, and its performance may at least partially be due to extensive pre-testing, resulting in dosages optimally adapted to the respective seed lot. In some of the experiments the effect of the hot water treatment, which was tested at a fixed, not specifically adapted dosage, was significantly improved when combined with a Pseudomonas sp. MF 416 or C. rosea IK726 treatment. The results are discussed in relation to the outcome of experiments in which the same seed treatment methods and agents were tested in other seed-borne vegetable pathosystems
Transfer of quantum states using finite resources
We discuss the problem of transfering a qubit from Alice to Bob using a noisy
quantum channel and only finite resources. As the basic protocol for the
transfer we apply quantum teleportation. It turns out that for a certain
quality of the channel direct teleportation combined with qubit purification is
superior to entanglement purification of the channel. If, however, the quality
of the channel is rather low one should simply apply an estimation-preparation
scheme.Comment: 9 pages RevTeX including 5 figures, replaced with revised version, to
appear in Phys. Rev.
STOVE: Seed treatments for organic vegetable production
The aim of the EU-financed research project âSTOVEâ (Seed Treatments for Organic Vegetable Production) is to evaluate different methods potentially suited for seed treatment of vegetables in organic farming regarding their efficacy, to optimise these methods, and where feasible to combine them with each other. Scientists from seven European research institutions and a producer of organic vegetable seeds carry out the project
Quantum correlated twin atomic beams via photo-dissociation of a molecular Bose-Einstein condensate
We study the process of photo-dissociation of a molecular Bose-Einstein
condensate as a potential source of strongly correlated twin atomic beams. We
show that the two beams can possess nearly perfect quantum squeezing in their
relative numbers.Comment: Corrected LaTeX file layou
South African physiotherapistsâ attitudes to medicine prescription as an extension of practice
DATA AVAILABILITY : Raw data are available upon request as unedited SPSS data
files, including outputs generated from the corresponding
author, W.C.BACKGROUND : The extension of medicine prescription rights to other healthcare providers was
proposed to reduce pharmacotherapeutic service delivery challenges in the South African
healthcare sector. The scope of practice of physiotherapists is being reviewed to possibly
include prescription rights to promote service delivery.
OBJECTIVES : Our study assessed the attitudes of registered South African physiotherapists to
the inclusion of prescription rights in their scope of practice, including enablers and challenges,
and the drug classes they believe to be most relevant.
METHOD : A cross-sectional descriptive survey of South African registered physiotherapists was
completed using an online questionnaire.
RESULTS : A total of 359 participants completed the questionnaire, where 88.2% agreed that
prescribing rights should be introduced, and 87.64% would want to be trained to prescribe.
Participants identified several benefits: improved service delivery (91.3%); reduced healthcare
delivery costs (89.8%); decreased need for multiple healthcare practitioner consultations
(93.2%). Concerns included: inadequate training (55%); increased workload (18.7%); increased
insurance premiums against medical liability claims (46.2%). Drugs of relevance included
analgesics (95.6%) and bronchodilators (96.0%), while low preference was placed on drugs
unrelated to physiotherapy. Chi-square analysis revealed associations between specific drug
classes and fields of expertise.
CONCLUSION : South African physiotherapists agree that prescribing and a limited formulary
would benefit their scope of practice; however, educational concerns are evident.
CLINICAL IMPLICATIONS : Findings support the drive to extend the South African physiotherapy
scope of practice, however, investigation will be needed to determine the most appropriate way to capacitate future physiotherapists and current graduates should the extension be
approved.http://www.sajp.co.zaam2024PharmacologyPhysiotherapyNon
Light-Front Quantisation as an Initial-Boundary Value Problem
In the light front quantisation scheme initial conditions are usually
provided on a single lightlike hyperplane. This, however, is insufficient to
yield a unique solution of the field equations. We investigate under which
additional conditions the problem of solving the field equations becomes well
posed. The consequences for quantisation are studied within a Hamiltonian
formulation by using the method of Faddeev and Jackiw for dealing with
first-order Lagrangians. For the prototype field theory of massive scalar
fields in 1+1 dimensions, we find that initial conditions for fixed light cone
time {\sl and} boundary conditions in the spatial variable are sufficient to
yield a consistent commutator algebra. Data on a second lightlike hyperplane
are not necessary. Hamiltonian and Euler-Lagrange equations of motion become
equivalent; the description of the dynamics remains canonical and simple. In
this way we justify the approach of discretised light cone quantisation.Comment: 26 pages (including figure), tex, figure in latex, TPR 93-
Parametrization of projector-based witnesses for bipartite systems
Entanglement witnesses are nonpositive Hermitian operators which can detect
the presence of entanglement. In this paper, we provide a general
parametrization for orthonormal basis of and use it to
construct projector-based witness operators for entanglement detection in the
vicinity of pure bipartite states. Our method to parameterize entanglement
witnesses is operationally simple and could be used for doing symbolic and
numerical calculations. As an example we use the method for detecting
entanglement between an atom and the single mode of quantized field, described
by the Jaynes-Cummings model. We also compare the detection of witnesses with
the negativity of the state, and show that in the vicinity of pure stats such
constructed witnesses able to detect entanglement of the state.Comment: 12 pages, four figure
Nonlinear Inequalities and Entropy-Concurrence Plane
Nonlinear inequalities based on the quadratic Renyi entropy for mixed
two-qubit states are characterized on the Entropy-Concurrence plane. This class
of inequalities is stronger than Clauser-Horne-Shimony-Holt (CHSH) inequalities
and, in particular, are violated "in toto" by the set of Type I
Maximally-Entangled-Mixture States (MEMS I)
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