2,190 research outputs found
Swaziland 'n ekonomiese oorsig met spesiale verwysing na die rol van kapitaal in die ekonomiese groei.*
Swaziland kan ekonomies as 'n integrale deel van die Republiek Suid-Afrika beskou word. In die afgelope tyd is 'n toenemende belangstelling in die ontwikkeling van die ekonomiese potensiaal van Swaziland ge- openbaar. Hierdie tendens tree nog sterker na vore as in aan- merking geneem word dat Swaziland ân groter ekonomiese potensiaal as beide Betsjoeanaland en Basoetoland besit ter- wyl dit geografies die kleinste HoĂ«kommissarisgebied is. Die probleem lĂȘ dus nie in die soek na die ekonomiese potensiaal nie maar in die skepping van gunstige toestande vir die ont wikkeling van die reeds bekende bronne. Die belangstelling is verder gestimuleer deur die Ekonomiese Sending wat in Julie 1959 aangestel is (in samewerking met die Intemasionale Bank vir Rekonstruksie en Ontwikkeling) met die doel om ondersoek in te stel na die bronne en vereiste vir ontwikkeling van die drie HoĂ«kommissarisgebiede en om aanbevelings t.o.v. moontlike ontwikkeling te maak
Mixings of 4-quark components in light non-singlet scalar mesons in QCD sum rules
Mixings of 4-quark components in the non-singlet scalar mesons are studied in
the QCD sum rules. We propose a formulation to evaluate the cross correlators
of q\bar q and qq\bar q \bar q operators and to define the mixings of different
Fock states in the sum rule. It is applied to the non-singlet scalar mesons,
a_0 and K_0^\ast. It is found that the 4-quark operators predict lower masses
than the q\bar q operators and that the 4-quark states occupy about 70-90% of
the lowest mass states.Comment: 8 pages, 9 figure
A construction for balancing non-binary sequences based on gray code prefixes
Abstract: We introduce a new construction for the balancing of non-binary sequences that make use of Gray codes for prefix coding. Our construction provides full encoding and decoding of sequences, including the prefix. This construction is based on a generalization of Knuthâs parallel balancing approach, which can handle very long information sequences. However, the overall sequenceâcomposed of the information sequence, together with the prefixâmust be balanced. This is reminiscent of Knuthâs serial algorithm. The encoding of our construction does not make use of lookup tables, while the decoding process is simple and can be done in parallel
Economic value of clinical decision support allied to direct data feedback to clinicians: blood usage in haematology
Background and Objectives:
Responding to national and local pressures to reduce the amount of blood transfused, the haematology department of Oxford University Hospitals (OUH), UK implemented an electronic bloodâordering system with clinical decision support. This intervention targeted junior doctors, giving regular feedback on their transfusion practices with respect to clinical guidelines. /
Methods:
We evaluated the incremental costs of the intervention using interrupted time series methods to compare red blood cell and platelet usage before and after the intervention was implemented. Differenceâinâdifferences analysis was used to control for external factors that would affect the use of blood products over time. Reductions in blood usage were balanced against intervention costs. /
Results:
The base case analysis showed an average cost saving to the department of ÂŁ89 304 annually as a result of the intervention. Scenario analyses suggested that the savings may have been greater still, had the increasing trend in blood use prior to the intervention continued in the absence of the intervention. /
Conclusion:
An electronic bloodâordering system with clinical decision support can reduce blood transfusions and associated healthcare costs. Focusing on improving junior doctors' transfusion practice is expected to have a knockâon benefit in terms of dissemination of good transfusion practice both within their own department and others as they continue their training
Encoding and Decoding of Balanced q-ary sequences using a gray code prefix
Abstract: Balancing sequences over a non-binary alphabet is considered, where the algebraic sum of the components (also known as the weight) is equal to some specific value. Various schemes based on Knuthâs simple binary balancing algorithm have been proposed. However, these have mostly assumed that the prefix describing the balancing point in the algorithm can easily be encoded. In this paper we show how non-binary Gray codes can be used to generate these prefixes. Together with a non-binary balancing algorithm, this forms a complete balancing system with straightforward and efficient encoding/decoding
Construction of efficient q-ary balanced codes
Abstract : AbstractâKnuth proposed a simple scheme for balancing codewords, which was later extended for generating q-ary balanced codewords. The redundancy of existing schemes for balancing q-ary sequences is larger than that of the full balanced set which is the minimum achievable redundancy. In this article, we present a simple and efficient method to encode the prefix that results in less redundancy for the construction of q-ary balanced codewords
SU(3) Decomposition of Two-Body B Decay Amplitudes
We present the complete flavor SU(3) decomposition of decay amplitudes for
decays of the triplet (B^+_u, B^0_d, B^0_s) of B mesons nonleptonically into
two pseudoscalar mesons. This analysis holds for arbitrarily broken SU(3) and
can be used to generate amplitude relations when physical arguments permit one
to neglect or relate any of the reduced amplitudes.Comment: 31 pages, revtex, no figure
Patch behaviour and predictability properties of modelled finite-amplitude sand ridges on the inner shelf
The long-term evolution of shoreface-connected sand ridges is investigated with a nonlinear spectral model which governs the dynamics of waves, currents, sediment transport and the bed level on the inner shelf. Wave variables are calculated with a shoaling-refraction model instead of using a parameterisation. The spectral model describes the time evolution of amplitudes of known eigenmodes of the linearised system. Bottom pattern formation occurs if the transverse bottom slope of the inner shelf, ÎČ, exceeds a critical value &beta;<sub>c</sub>. For fixed model parameters the sensitivity of the properties of modelled sand ridges to changes in the number (<i>N</i>&minus;1) of resolved subharmonics (of the initially fastest growing mode) is investigated. For any <i>N</i> the model shows the growth and subsequent saturation of the height of the sand ridges. The saturation time scale is several thousands of years, which suggests that observed sand ridges have not reached their saturated stage yet. The migration speed of the ridges and the average longshore spacing between successive crests in the saturated state differ from those in the initial state. Analysis of the potential energy balance of the ridges reveals that bed slope-induced sediment transport is crucial for the saturation process. In the transient stage the shoreface-connected ridges occur in patches. The overall characteristics of the bedforms (saturation time, final maximum height, average longshore spacing, migration speed) hardly vary with <i>N</i>. However, individual time series of modal amplitudes and bottom patterns strongly depend on <i>N</i>, thereby implying that the detailed evolution of sand ridges can only be predicted over a limited time interval. Additional experiments show that the critical bed slope &beta;<sub>c</sub> increases with larger offshore angles of wave incidence, larger offshore wave heights and longer wave periods, and that the corresponding maximum height of the ridges decreases whilst the saturation time increases
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