IS PREVENTION ALWAYS BETTER? A CASE OF IT SERVICE MANAGEMENT

Information Technology Infrastructure Library (ITIL), a framework for IT Service Management (ITSM), emphasizes the need for an ongoing preventive activity woven into the fabric of enterprise IT of organizations as opposed to a reacting to a specific situation. However, with the increasing focus on cost reduction, it is essential to revisit the trade-off between costs and other primary ITSM objectives such as service availability and quality. With this basic premise, we compare the cost of conducting IT service operations with varying levels of prevention. We modelled the IT service operation processes based on queuing and software reliability theories while assessing the impact of exogenous variables such as initial application maturity, drop rates & monitoring cost. We illustrated that optimum lies between the extremes of complete prevention and reaction. Also, we were able to observe the pronounced impact of staffing stickiness on the results

Investigation of a Bubble Detector based on Active Electrolocation of Weakly Electric Fish

Weakly electric fish employ active electrolocation for navigation and object detection. They emit an electric signal with their electric organ in the tail and sense the electric field with electroreceptors that are distributed over their skin. We adopted this principle to design a bubble detector that can detect gas bubbles in a fluid or, in principle, objects with different electric conductivity than the surrounding fluid. The evaluation of the influence of electrode diameter on detecting a given bubble size showed that the signal increases with electrode diameter. Therefore it appears that this detector will be more appropriate for large sized applications such as bubble columns than small sized applications such as bubble detectors in dialysis

Ethyl 4-(2,4-dichloro­phen­yl)-6-(6-meth­oxy-2-naphth­yl)-2-oxocyclo­hex-3-ene-1-carboxyl­ate

In the title compound, C26H22Cl2O4, the cyclo­hexenone ring adopts an approximate half-chair conformation, with two C atoms displaced by −0.485 (6) and 0.218 (6) Å from the plane of the other four ring atoms. The dihedral angles between its four almost coplanar [maximum deviation = 0.006 (2) Å] atoms and the benzene and naphthalene ring systems are 59.26 (13) and 79.94 (9)°, respectively. The dihedral angle between the aromatic rings systems is 77.14 (7)°. A short intra­molecular C—H⋯Cl contact generates an S(6) ring. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯Cl inter­actions to generate a three-dimensional network

(2E)-1-(2,4-Di­chloro­phen­yl)-3-(quinolin-8-yl)prop-2-en-1-one

The geometric parameters of the mol­ecule of the title compound, C18H11Cl2NO, a chalcone derivative, are in the usual ranges. The central C=C double bond is trans configured. The dihedral angle between the two aromatic residues is 41.90 (8)°

4,8-Dihydr­­oxy-2-methyl-1,2,3,4-tetra­hydro­isoquinolinium chloride mono­hydrate

Geometric parameters of the title compound, C10H14NO2+·­Cl−·H2O, are in the usual ranges. The tetra­hydro­pyridine ring adopts a half-chair conformation with the methyl group in an equatorial and the hydr­oxy group in an axial position. The crystal packing is stabilized by O—H⋯O, O—H⋯Cl and N—H⋯Cl hydrogen bonds. The absolute configurations of both chiral centres have been determined to be R

(2E)-1-(2,4-Di­chloro­phen­yl)-3-(2-hy­droxy­phen­yl)prop-2-en-1-one

The geometric parameters of the title mol­ecule, C15H10Cl2O2, are in the ususal ranges. The central double bond is trans configured. The dihedral angle between the dichloro­phenyl and hydroxy­phenyl rings is 71.38 (3)°. The crystal packing is stabilized by O—H⋯O hydrogen bonds and C—H⋯O contacts

(2E)-1-(2,4-Di­chloro­phen­yl)-3-(4-nitrophen­yl)prop-2-en-1-one

In the title compound, C15H9Cl2NO3, the central double bond is trans configured and the dihedral angle between the two planar fragments of the mol­ecule is 44.53 (4)°. The crystal packing is stabilized by C—H⋯O and C—H⋯Cl contacts

Performance studies of the Belle II Silicon Vertex Detector with data taken at the DESY test beam in April 2016

Belle II is a multipurpose detector currently under construction which will be operated at the next generation B-factory SuberKEKB in Japan. Its main devices for the vertex reconstruction are the Silicon Vertex Detector (SVD) and the Pixel Detector (PXD). In April 2016 a sector of the Belle II SVD and PXD have been tested in a beam of high energetic electrons at the test beam facility at DESY Hamburg (Germany). We report here the results for the hit efficiency estimation and the measurement of the resolution for the Belle II silicon vertex etector. We find that the hit efficiencies are on average above 99.5% and that the measured resolution is within the expectations

Performance studies of the Belle II Silicon Vertex Detector with data taken at the DESY test beam in April 2016

Belle II is a multipurpose detector currently under construction which will be operated at the next generation B-factory SuberKEKB in Japan. Its main devices for the vertex reconstruction are the Silicon Vertex Detector (SVD) and the Pixel Detector (PXD). In April 2016 a sector of the Belle II SVD and PXD have been tested in a beam of high energetic electrons at the test beam facility at DESY Hamburg (Germany). We report here the results for the hit efficiency estimation and the measurement of the resolution for the Belle II silicon vertex etector. We find that the hit efficiencies are on average above 99.5% and that the measured resolution is within the expectations

The Belle II SVD detector

The Silicon Vertex Detector (SVD) is one of the main detectors in the Belle II experiment at KEK, Japan. In combination with a pixel detector, the SVD determines precise decay vertex and low-momentum track reconstruction. The SVD ladders are being developed at several institutes. For the development of the tracking algorithm as well as the performance estimation of the ladders, beam tests for the ladders were performed. We report an overview of the SVD development, its performance measured in the beam test, and the prospect of its assembly and commissioning until installation