601 research outputs found
Characterizing the Delaunay decompositions of compact hyperbolic surfaces
Given a Delaunay decomposition of a compact hyperbolic surface, one may
record the topological data of the decomposition, together with the
intersection angles between the `empty disks' circumscribing the regions of the
decomposition. The main result of this paper is a characterization of when a
given topological decomposition and angle assignment can be realized as the
data of an actual Delaunay decomposition of a hyperbolic surface.Comment: Published by Geometry and Topology at
http://www.maths.warwick.ac.uk/gt/GTVol6/paper12.abs.htm
Finanzielle Berichterstattung von PPP unter IPSAS : Ein Projekt in Zusammenarbeit mit der Förderagentur fĂŒr Innovation des Bundes KTI
In der wissenschaftlichen und politischen Debatte fĂ€llt die ambivalente Haltung gegenĂŒber den PPP auf. Auf der einen Seite wird PPP wegen seiner Effizienz- und EffektivitĂ€tsvorteile gepriesen und auf der anderen Seite wird PPP als ein Mittel zur Umgehung der Schuldenbremsen betrachtet.
Das Ziel unserer Studie ist mit Hilfe der wirtschaftlichen Betrachtungsweise aus der Rechnungslegungstheorie ("Substance over form") eine BrĂŒcke zwischen den beiden Lagern zu schlagen: Indem man klare Regeln fĂŒr eine transparente Berichterstattung festlegt, kann man eine Instrumentalisierung von PPP fĂŒr fiskalpolitische Spielereien verhindern und rĂŒckt so die Wirtschaftlichkeitsbetrachtung von PPP in den Vordergrund.
Um dieses Ziel zu erreichen, steht die Beantwortungen der folgenden beiden Forschungsfragen im Zentrum dieser Arbeit:
⹠Wie sind PPP gemÀss einer wirtschaftlichen Betrachtungsweise in der Rechnungslegung nach IPSAS abzubilden und wie kann insbesondere der neue IPSAS zu den Dienstleistungskonzessionen in der Praxis angewendet werden?
âą Welche Auswirkungen hat die wirtschaftliche Betrachtungsweise auf die finanzielle Berichterstattung und die Schuldenbremse?
Um diese Fragen zu beantworten, wird in einem ersten Schritt der Forschungsgegenstand PPP umschrieben. Insbesondere wird auf die zwei in der Praxis und Theorie am meisten diskutierten Gesichtspunkte rund um das Konzept PPP eingegangen: Die verdeckte Verschuldung sowie Effizienz- und EffektivitĂ€tsvorteile. Diese beiden Aspekte stehen in einem unmittelbaren Zusammenhang mit den Anforderungen der modernen Rechnungslegung und so wird der Bogen zur Darstellung von PPP in der Rechnungslegung auf Basis einer wirtschaftlichen Betrachtungsweise gespannt. Nach einem Ăberblick ĂŒber die verschiedenen internationalen AnsĂ€tze wird der neue Lösungsansatz vom IPSAS-Board aufgezeigt. Die International Federation of Accountants, welche Projektpartner beim KTI-Projekt PPP unter IPSAS ist, hat unter Mitarbeit des Instituts fĂŒr Verwaltungs-Management einen Lösungsvorschlag erarbeitet, der vom IPSAS-Board im September 2009 verabschiedet wird.
Dieser neue Ansatz von IPSAS wird auf Praxisbeispiele angewendet und dadurch werden die Prinzipien dieses Ansatzes fĂŒr die Anwendung in der Praxis aufbereitet. Mit den Praxisbeispielen und der strukturierten Ăbersicht im Anhang soll ein Leitfaden fĂŒr die Anwendung dieses neuen Ansatzes in der Praxis gegeben werden. Im letzten Kapitel wird der IPSAS-Ansatz aus einer theoretischen Sicht gewĂŒrdigt und es werden die Auswirkungen auf die finanzielle Berichterstattung sowie die Schuldenbremse aufgezeigt
Late-Stage Molecular Editing Enabled by Ketone Chain-Walking Isomerization
Herein, a method for the isomerization of ketones in a manner akin to the chain-walking reaction of alkenes is described. Widely available and inexpensive pyrrolidine and elemental sulfur are deployed as catalysts to achieve this reversible transformation. Key to the utility of this approach was the elucidation of a stereochemical model to determine the thermodynamically favored product of the reaction and the kinetic selectivity observed. With the distinct selectivity profile of our ketone chain-walking process, the isomerization of various steroids was demonstrated to rapidly access novel steroids with "unnatural" oxidation patterns.ISSN:0002-7863ISSN:1520-512
Head Coverings in the Courtroom: A Question of Respect for the Judge or of Judicial Tolerance?
The Human Rights Centre at Ghent University (the HRC) first initiated the present research while preparing an amicus curiae brief in the Lachiri v. Belgium case before the European Court of Human Rights (ECtHR). The applicant in Lachiri, who was a civil party in legal proceedings concerning the murder of her brother, was denied access to
a Brussels courtroom after refusing to remove her Islamic headscarf
. Ms. Lachiriâs admission was refused in reliance on Article 759 of the Belgian Judicial Code (Gerechtelijk Wetboek/ Code Judiciaire), which
provides that â[t]he audience will attend the sessions with their heads uncovered, respectfully and silently; whatever the judge commands for the maintenance of order will be punctually and immediately executed.â
In its third-party intervention, the HRC sought to supply the ECtHR with additional information concerning three points: the debate on the wearing of Islamic headscarves in Belgium, the history, object and purpose of Article 759 of the Belgian Judicial Code, and the scope of the State margin of appreciation in prohibiting religious items of clothing
Bericht zum Leitbild der Stadt Winterthur fĂŒr die musikalische Bildung im Schul- und Jugendalter
Das Zentrum fĂŒr Kulturmanagement der ZĂŒrcher Hochschule fĂŒr Angewandte Wissenschaften (ZKM / ZHAW) erhielt vom Departement Schule und Sport der Stadt Winterthur den Auftrag, ein Musikförderleitbild fĂŒr den ausserschulischen Musikunterricht fĂŒr Kinder und Jugendliche bis 20 Jahren zu erstellen. Das genannte Musikförderleitbild ist Teil eines Gesamtauftrages, der zusĂ€tzlich die Evaluation des bestehenden Angebots an
Musikförderung auf Grund des Leitbildes und die Erarbeitung von VorschlĂ€gen fĂŒr die fachliche QualitĂ€tsentwicklung bzw. -sicherung umfasst.
Vorliegendes Dokument beinhaltet die musikpĂ€dagogischen Grundlagen, die rechtlichen und die institutionellen Rahmenbedingungen sowie die politischen und gesellschaftlichen Voraussetzungen fĂŒr die Entwicklung eines Musikförderleitbildes. Ebenfalls enthĂ€lt dieses Dokument Handlungsempfehlungen fĂŒr die Weiterentwicklung der musikalischen Bildung sowie eine erste Version des Leitbildes, die in eine interne Vernehmlassung ins Departement Schule und Sport geht und anschliessend ĂŒberarbeitet wird
Patient-reported outcome measures compared to professional dental assessments of monolithic ZrO(2) implant fixed dental prostheses in complete digital workflows: A double-blind crossover randomized controlled trial
PURPOSE
This double-blind randomized controlled trial analyzed patient-reported outcome measures in terms of subjective patient satisfaction compared to objective dental evaluation of prosthetic treatment with 3-unit monolithic zirconium dioxide implant fixed dental prostheses (iFDPs) in 3 digital workflows.
MATERIAL AND METHODS
Twenty patients were restored with 3 iFDPs each on Straumann TL-implants with 2 completely digital workflows using different intraoral optical scanning systems with model-free fabrication of the restoration (Trios 3/3Shape [Test-1]; Virtuo Vivo/Straumann [Test-2]), and mixed analog-digital workflow with conventional impressions and digitized gypsum casts (Impregum/3M Espe [Control]). The order of impression-taking and the prosthetic try-in were randomly allocated. Sixty iFDPs were compared for patient satisfaction and dental evaluation using ANOVA.
RESULTS
For iFDP evaluation, patients generally provided more favorable ratings than dental experts, regardless of the workflow. ANOVA revealed no significant difference for overall satisfaction when comparing Test-1, Test-2, or Control, either for patients (f-ratio: 0.13; p = 0.876) or dentist (f-ratio: 1.55: p = 0.221). Secondary, patients clearly favored the digital impression workflows over the conventional approach (f-ratio: 14.57; p < 0.001). Overall, the 3Shape workflow (Test-1) received the highest scores for all analyses.
CONCLUSIONS
The different digital workflows demonstrated minor influence on the subjective and objective evaluation of the monolithic zirconium dioxide iFDPs in nonesthetic regions; however, the dentist may significantly increase patient satisfaction by choosing intraoral scanning instead of conventional impressions. The dentist has to consider individual patients' needs to fulfill their expectations for a personalized solution
Rigidity of polyhedral surfaces, II
We study the rigidity of polyhedral surfaces using variational principle. The
action functionals are derived from the cosine laws. The main focus of this
paper is on the cosine law for a non-triangular region bounded by three
possibly disjoint geodesics. Several of these cosine laws were first discovered
and used by Fenchel and Nielsen. By studying the derivative of the cosine laws,
we discover a uniform approach on several variational principles on polyhedral
surfaces with or without boundary. As a consequence, the work of Penner,
Bobenko-Springborn and Thurston on rigidity of polyhedral surfaces and circle
patterns are extended to a very general context.Comment: 37 pages, 23 figure
Monolithic implantâsupported lithium disilicate (LS2) crowns in a complete digital workflow: A prospective clinical trial with a 2âyear followâup
Background: The technical development of digital processing allows the production of anatomically fullâcontoured implantâsupported restorations.
Purpose: The aim of this prospective clinical trial was to analyze the treatment concept of monolithic lithium disilicate (LS2) singleâunit restorations in a complete digital workflow.
Material and Methods: Fortyâfour patients were restored with 50 screwâretained monolithic implant LS2 crowns bonded to preâfabricated titanium abutments on soft tissue level implants (Institut Straumann AG, Basel, Switzerland) in premolar and molar sites. All implant restorations were digitally designed after intraoral optical scanning (IOS) and CAD/CAMâprocessing without physical model situations. Study participants were clinically and radiographically examined based on an annually performed followâup. The âFunctional Implant Prosthodontic Scoreâ (FIPS) was applied for objective outcome assessment after 2 years of loading. Five variables were defined for FIPS evaluation, resulting in a maximum score of 10 per implant restoration. Descriptive statistics were calculated for mean scores standard deviations, medians, and Qââ
âQââ
.
Results: All patients could be successfully treated within two clinical appointments. No clinical modifications were necessary for the seating of the monolithic crowns, neither for interproximal nor occlusal sites. The implant LS2 restorations demonstrated survival rates of 100% without any technical or biological complications after 2 years. The mean total FIPS score was 7.7â±â1.0, ranging from 6 to 10.
Conclusions: CAD/CAMâproduced monolithic implant crowns out of LS2 in a complete digital workflow seem to be a feasible treatment concept for the rehabilitation of singleâtooth gaps in posterior sites under midâterm observation
A digital approach for one-step formation of the supra-implant emergence profile with an individualized CAD/CAM healing abutment.
PURPOSE
This Technical Procedure describes a novel workflow for a one-step formation of the supra-implant emergence profile in the esthetic zone - the 'Digitally Flip Technique' (DFT).
METHODS
After implant placement, a post-operative intra-oral optical scan (IOS) was performed to capture the final three-dimensional implant position. Based on the superimposition of the digitally slice-wise DICOM-segmentation of the digitally flipped (mirrored) contra-lateral tooth and the STL-file of the IOS, an individualized healing abutment was CAD/CAM-fabricated out of PMMA-based restoration material in a fully digital workflow and seated at the stage of reopening surgery. One single treatment step was necessary for final modulation of the supra-implant mucosa architecture in order to mimic the morphological emergence profile of the contra-lateral tooth within a short-span time frame of four days after insertion of the individualized healing abutment.
CONCLUSIONS
The implant crown emergence profile could be shaped immediately after reopening according to the three-dimensional radiographic contour of the digitally flipped contra-lateral tooth. Estimating the emergence profile or time-consuming step-by-step conditioning of the mucosa through an additionally produced implant provisional was therefore avoided
- âŠ