Schwinger--Dyson BRST symmetry and the Batalin--Vilkovisky Lagrangian Quantisation of Gauge Theories with Open or Reducible Gauge Algebras

In this short note we extend the results of Alfaro and Damgaard on the origin of antifields to theories with a gauge algebra that is open or reducible.Comment: 10p, CERN-TH-6858/93, KUL-TF-93/1

Master Equations for Extended Lagrangian BRST Symmetries

Starting from the requirement that a Lagrangian field theory be invariant under both Schwinger-Dyson BRST and Schwinger-Dyson anti-BRST symmetry, we derive the BRST--anti-BRST analogue of the Batalin-Vilkovisky formalism. This is done through standard Lagrangian gauge fixing respecting the extended BRST symmetry. The solutions of the resulting Master Equation and the gauge-fixing procedure for the quantum action can be brought into forms that coincide with those obtained earlier on algebraic grounds by Batalin, Lavrov and Tyutin.Comment: 12 pages, LaTeX, KUL-TF-93/04 and CERN-TH-6800/9

Monitoring of clinical activities and performances by using international classifications ICD-10 and ICPC-2: Three years experience of the Kigali University Teaching Hospital, Rwanda

peer reviewedMeasuring performances of health professionals and health facilities is a difficult task. However, with the appropriate information management tools, a lot of useful information can be collected from routine data registration activities. Situated in the capital of Rwanda, the Central Kigali University Teaching Hospital developed in January 2006 its electronic patient record using both ICD10 and ICPC2 codes for the structured registration of diseases and procedures. In order to enable synoptic data analysis, individual codes have been grouped into a set of 174 disease groups (KHIRI Pathology Group Set –KPGS). To assess the activities and performances of the different clinical departments, outcome data were analyzed following a number of essential criteria: the caseload, the LOS (length of stay) load and the in-hospital mortality load. A total number of 27784 patients were admitted during the study period. On the 27784 patients a total of respectively 30609 and 29447 diagnoses were recorded in ICPC2 and ICD10. The total of hospitalization days was 395256. 2759 patients died over the 3 years study period. Four ICPC classes covered more than 10% of the encodings each: A (general) 5649, D (digestive system) 6040, L (locomotors system) 3297 and R (respiratory system) counted for 4026 registrations. Comparable results could be obtained in the corresponding ICD classes A+B, K, M+S-T and J. Linking ICD10 and ICPC2 codes to global patient data clearly enables the physicians and the hospital management to produce comparable, standardized and internationally valuable evaluations of the hospital activities and trends. It also opens the perspective of fixing objective priorities in patient management and provides an interesting starting point for comparing health professionals’ clinical performances in a standardized way

Schwinger-Dyson BRST-Symmetry and the Equivalence of Hamiltonian and Lagrangian Quantistion

Implementing the requirement that a field theory be invariant under Schwinger-Dyson BRST symmetry in the Hamiltonian formalism, we show the equivalence between Hamiltonian and Lagrangian BRST-formalism at the path integral level. The Lagrangian quantum master equation is derived as a direct consequence of the Fradkin-Vilkovisky theorem in Hamiltonian BRST quantisation.Comment: 10p, KUL-TF-93/08 and CERN- TH-6823/9

Ultrafast charge transfer in solid-state films of pristine cyanine borate and blends with fullerene

Photoinduced electron transfer in light-absorbing materials is the first step towards charge separation and extraction in small molecule-based organic solar cells. The excited state dynamics of the cyanine dye cation Cy3 paired with a tetraphenylborate counter-anion (Cy3-B) was studied in pristine solid-state films of the dye and in blends with the electron acceptor material PCBM. Here we show that photoexcited Cy3-B in pure films undergoes intra-ion pair reductive quenching on the picosecond time scale, while in blends with PCBM sub-picosecond formation of the Cy3 oxidized species is observed upon electron injection from the dye excited state into the fullerene. Kinetic competition between light-induced electron- and hole transfer processes strongly depends on the PCBM content in the blends. A high PCBM loading produces a fully intermixed phase, where the cyanine oxidized states appear on ultrashort (<160 fs) time scales. Lower PCBM contents, in contrast, lead to a Cy3-B segregated phase on top of the intermixed phase and slower excited state quenching. These findings show that the phase morphology indeed controls to a large extent the efficiency of primary photoinduced charge separation, on which small molecule-based organic photovoltaic cells rely

Clinical use of the Hamilton Depression Rating Scale: is increased efficiency possible? A post hoc comparison of Hamilton Depression Rating Scale, Maier and Bech subscales, Clinical Global Impression, and Symptom Checklist-90 scores

or =7 criterion in both subscales. CONCLUSION: In clinical practice, both Maier and Bech scales can be used as equivalents of the HDRS, but will be more efficien

Dissociation of charge transfer states and carriers separation in bilayer organic solar cells - A time-resolved electroabsorption spectroscopy study

Ultrafast optical probing of the electric field by means of Stark effect in planar heterojunction cyanine dye / fullerene organic solar cells enables to directly monitor the dynamics of free electron formation during the dissociation of interfacial charge transfer (CT) states. Motions of electrons and holes is scrutinized separately by selectively probing the Stark shift dynamics at selected wavelengths. It is shown that only charge pairs with an effective electron-hole separation distance of less than 4 nm are created during the dissociation of Frenkel excitons. Dissociation of the Coulombically bound charge pairs is identified as the major rate-limiting step for charge carriers’ generation. Interfacial CT states split into free charges on the time-scale of tens to hundreds of picoseconds, mainly by electron escape from the Coulomb potential over a barrier that is lowered by the electric field. The motion of holes in the small molecule donor material during the charge separation time is found to be insignificant