28 research outputs found
Error sources and data limitations for the prediction ofsurface gravity: a case study using benchmarks
Gravity-based heights require gravity values at levelled benchmarks (BMs), whichsometimes have to be predicted from surrounding observations. We use EGM2008 andthe Australian National Gravity Database (ANGD) as examples of model and terrestrialobserved data respectively to predict gravity at Australian national levelling network(ANLN) BMs. The aim is to quantify errors that may propagate into the predicted BMgravity values and then into gravimetric height corrections (HCs). Our results indicatethat an approximate ±1 arc-minute horizontal position error of the BMs causesmaximum errors in EGM2008 BM gravity of ~ 22 mGal (~55 mm in the HC at ~2200 melevation) and ~18 mGal for ANGD BM gravity because the values are not computed atthe true location of the BM. We use RTM (residual terrain modelling) techniques toshow that ~50% of EGM2008 BM gravity error in a moderately mountainous regioncan be accounted for by signal omission. Non-representative sampling of ANGDgravity in this region may cause errors of up to 50 mGals (~120 mm for the Helmertorthometric correction at ~2200 m elevation). For modelled gravity at BMs to beviable, levelling networks need horizontal BM positions accurate to a few metres, whileRTM techniques can be used to reduce signal omission error. Unrepresentative gravitysampling in mountains can be remedied by denser and more representative re-surveys,and/or gravity can be forward modelled into regions of sparser gravity
The influence of cytochalasin B, colchicine, and vinblastine on the attachement ofEntamoeba histolytica to glass surfaces
Searching for an ideal: a cross‐disciplinary study of university faculty performance evaluation
Rediscovery of at Belle II
We present preliminary results on the reconstruction of the decay, where or . Using a dataset corresponding to a luminosity of 62.8\pm0.6\mbox{fb}^{-1} collected by the Belle II experiment at the SuperKEKB asymmetric energy collider, we measure a total of candidates with and with with . The quoted errors are statistical only
Measurement of the Branching Fraction in 62.8 fb of Belle II data
We report a measurement of the branching fraction of the semileptonic decay (and its charge conjugate) using 62.8 fb of (4) data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy collider. The neutral charm meson is searched for in the decay mode and combined with a properly charged identified lepton (electron or muon) to reconstruct this decay. No reconstruction of the second meson in the (4) event is performed. We obtain () = (2.29 0.05 0.08, in agreement with the world average of this decay. We also determine the ratio of the electron to muon branching fractions to be (/) = 1.04 0.05 0.03 and observe no deviation from lepton universality
Measurements of branching fractions and direct CP-violating asymmetries in and decays using 2019 and 2020 Belle II data
We report measurements of branching fractions () and direct -violating asymmetries () for the decays and reconstructed with the Belle II detector in a sample of asymmetric-energy electron-positron collisions at the resonance corresponding to 62.8 of integrated luminosity. The results are , , , and . The results are consistent with previous measurements and show a detector performance comparable with early Belle performance
Measurements of branching fractions and CP-violating charge asymmetries in multibody charmless decays reconstructed in 2019-2020 Belle II data
We report on measurements of branching fractions () and CP-violating charge asymmetries () of multibody charmless decays reconstructed by the Belle II experiment at the SuperKEKB electron-positron collider. We use a sample of collisions collected in 2019 and 2020 at the resonance and corresponding to fb of integrated luminosity. We use simulation to determine optimized event selections. The and distributions of the resulting samples are fit to determine signal yields of approximately 690, 840, and 380 decays for the channels , , and , respectively. These yields are corrected for efficiencies determined from simulation and control data samples to obtain , , , , , and . Results are consistent with previous measurements and demonstrate detector performance comparable with the best Belle results