3,110 research outputs found
Over de cyclus der zogenaamde drempelgeulen in de oostelijke uitloop van de Zimmermangeul
No full textReeds jarenlang vormt het Nauw van Bath in het bovenstroomse deel van de Westerschelde een der moeilijkst te bevaren geulgedeelten van de scheepvaartweg van en naar Antwerpen. Als gevolg van het verrichten van omvangrijke baggerwerken langs de noordoostelijke rand van de Plaat van Saaftinge (bijlage 1) heeft de in scheepvaartkringen beruchte Bocht van Bath de laatste jaren een wat gunstiger ligging verkregen. Het aan de benedenstroomse zijde van het Nauw van Bath optredende vloedstroombeeld (dwarsstromingen vanuit de Zimmermangeul) vormt echter een omstandigheid waarmee ook thans nog terdege rekening moet worden gehouden. In het begin van 1963 vond in het Nauw van Bath ter hoogte van de uitloop van de Zimmermangeul een ernstige scheepsramp plaats. De bewuste uitloop vertoonde toendertijd een opmerkelijk sterke ontwikkeling met een vooral bij springtij zeer ongunstige stromingssituatie. Voor de Antwerpse Zeediensten was de toenemende ontwikkeling van de Zimmermangeul overigens reeds in oktober 1962 reden een onderzoek naar het in dit gebied optredende stroombeeld te verrichten. De opgetreden scheepsramp vormde voor de Studiedienst Vlissingen de aanleiding een onderzoek naar de ontwikkelingen in ing. D. de Looff ir. J. van Malde dit gebied in te stellen
Comparison of propofol-based anesthesia to conventional inhalational general anesthesia for spine surgery-Few queries
No full textAnaesthesia risk stratification: Time to think beyond American society of anesthesiologists physical status classification
No full textD-0-(D)over-bar(0) mixing studies with the decays D-0 -> (KSK -/+)-K-0 pi(+/-)
No full textWe demonstrate how a time-dependent analysis of the decays D 0→K S0K ∓π ± can be used to determine the D 0-D∥ 0 mixing parameter y with a precision that is competitive with established methods. The proposed analysis is an inclusive study which makes use of the measurements of the coherence factor and mean strong phase difference for these decays recently performed by CLEO. © 2011 Elsevier B.V
Lifetime and mixing parameters of neutral D mesons and neutral B hadrons in experimental particle physics
No full textA review of recent experimental measurements of the lifetime and mixing parameters of neutral D and B hadrons is presented. In particular, focus is given to measurements of D mixing and the ΛB lifetime
CP-violation in partially reconstructed B± → D*h± decays at LHCb
No full textThis thesis presents a measurement of CP-violation in partially reconstructed B±→D*K± and B±→D*π± decays, where the neutral pion and photon from the D*→Dπ0 and D*→Dγ decays are not reconstructed. The D meson is subsequently reconstructed in the D→KS0π+π− or D→KS0K+K− final state. The measurement of CP-violation is performed by analysing the distribution of the signal yields over the D-decay phase space, without relying on a D-decay amplitude model. Instead, inputs for strong phase-related parameters measured at CLEO and BESIII are used. The measurement is performed using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, with a total integrated luminosity of approximately 9 fb−1. The work in this thesis measures CP-violating observables using partially reconstructed B±→D*K± and B±→D*π± decays at LHCb. These observables are interpreted in terms of physical parameters, including the Cabibbo-Kobayashi-Maskawa angle, γ, a fundamental Standard Model parameter. This is found to be γ = (92 +21 -17)◦, where the total uncertainty includes the statistical and all systematic uncertainties
Solution conformation of Substance P antagonists—[d-Arg1, d-Trp7,9, Leu11]-SP, [d-Arg1, d-Pro2, d-Trp7,9, Leu11]-SP and [d-Pro2, d-Trp7,9]-SP by CD, NMR and MD simulations
No full textSubstance P (SP) is an important neuropeptide involved in pain transmission and induction of inflammation. Its antagonists are being extensively investigated for their non-narcotic analgesic and anti-inflammatory activity. With a view towards better understanding the structural requirements of these analogs for efficient interaction with the SP receptor, the conformation of three SP antagonists [d-Arg1, d-Trp7,9, Leu11]-SP, [d-Arg1, d-Pro2, d-Trp7,9, Leu11]-SP and [d-Pro2, d-Trp7,9]-SP has been studied by CD, NMR and molecular dynamics (MD) simulations. All three peptides exhibit a high dependence of structure on the solvent. The molecules tend to adopt β-turns in solvents like DMSO and H2O and form helices in a hydrophobic environment. A direct relation between the helix forming potential of these antagonists with their receptor binding potency has been observed
Measurement of the D+/- production asymmetry in 7 TeV pp collisions
No full textThe asymmetry in the production cross-section \sigma of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D+ -> K_S pi+ decays corresponding to an integrated luminosity of 1.0 fb^-1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0 K_S pi+ decay is negligible. No significant dependence on \eta or p_T is observed
Measurements of the CKM angle gamma using B^+ --> D K^+ decays at LHCb
No full textOf the three angles that make up the CKM matrix, the least well known is gamma. A precision measurement of this quantity is highly desirable as it forms one of the arbitrary parameters in the Standard Model. Moreover, this is the one angle of the CKM triangle that can be determined in channels that occur via tree-level decays. While loop-level processes could have sensitivity to physics beyond the standard model, tree level processes are expected to be unaltered. Hence a measurement of gamma in tree level processes leads to a standard model benchmark measurement against which other loop-driven measurements can be compared. The measurements described here are the latest developments from LHCb involving the decay B^+ --> D K^+, where the D meson is either a D^0 or a anti-D^0 and the final state of the D meson is accessible from either flavour state.Of the three angles that make up the CKM matrix, the least well known is gamma. A precision measurement of this quantity is highly desirable as it forms one of the arbitrary parameters in the Standard Model. Moreover, this is the one angle of the CKM triangle that can be determined in channels that occur via tree-level decays. While loop-level processes could have sensitivity to physics beyond the standard model, tree level processes are expected to be unaltered. Hence a measurement of gamma in tree level processes leads to a standard model benchmark measurement against which other loop-driven measurements can be compared. The measurements described here are the latest developments from LHCb involving the decay B^+ --> D K^+, where the D meson is either a D^0 or a anti-D^0 and the final state of the D meson is accessible from either flavour state
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