Überlebensraten, Rezidivmuster uns ästhetische Ergebnisse nach Strahlentherapie beim brusterhaltend operierten Mammakarzinom der Frau am Universitätsklinikum Jena in den Jahren 1993 bis 2003

Ziel der vorliegenden Arbeit war es, das Patientinnengut, angewandte Therapien und die Ergebnisse der Strahlentherapie beim brusterhaltend operierten Mamma-karzinom der Frau am Klinikum der Friedrich- Schiller- Universität Jena (FSU Jena) im Zeitraum vom 01.01.1998 bis 31.12.2003 zu erfassen und mit bereits vorliegenden Ergebnissen aus dem Zeitraum vom 01.01.1993 bis 31.12.1997 zu vergleichen. Des Weiteren wurde untersucht, welche Faktoren das ästhetische Früh- und Spätergebnis, die Lokalrezidivrate, das Metastasierungsmuster, das Gesamtüberleben sowie die tumorbedingte Sterberate beeinflussten. Besonderer Fokus wurde bei diesen Analysen auf den Einfluss der Bestrahlungstechnik gelegt. Insgesamt wurden 421 Patientinnen mit histologisch gesichertem Mammakarzinom im UICC- Stadium I bis IIIb oder einem Carcinoma in situ in die Analyse aufgenommen

Annual Thermodynamic Analysis of Solar Power with Steam Injection Gas Turbine (STIG) Cycle for Indian Conditions

AbstractSolar thermal energy is now being widely utilized to meet the world's energy demand due to its huge potential. Power generation from solar is varying and high cost of solar thermal energy systems that makes sense only in regions with high solar insolation. In order to overcome these practical issues, low cost solar hybrid steam injection gas turbine (STIG) cycle is adapted. Both gas turbine exhaust stream and solar heat are used for steam generation, and then it is injected into the combustor. The steam injection reduces NOX and CO2 emission in addition to increased power output and plant efficiency compared to the simple cycle. It offers a path for high conversion efficiency without the requirement of operating at high temperature and high pressure in the solar components. The objective of the proposed work is to investigate a conversion method for solar radiation that offers potentially high conversion efficiency and for increased competitiveness against fossil fuels. The annual performance of the cycle for sites in India with local climatic conditions such as ambient temperature, relative humidity and availability of direct normal irradiance to the solar concentrators under two modes of constant and variable power is presented in this paper. The results reveal that the solar to electricity efficiency of solar hybrid STIG plant with a simple Parabolic Trough Collector (PTC) is similar to existing solar thermal technologies and higher solar share is obtained. The study also reveals that the annual CO2 emission is similar to combined cycle plants and lower than gas turbine technologies

Continuous tracking of heliostats

Tracking motions in current heliostat

Integration of an On-Axis General Sun-Tracking Formula in the Algorithm of an Open-Loop Sun-Tracking System

A novel on-axis general sun-tracking formula has been integrated in the algorithm of an open-loop sun-tracking system in order to track the sun accurately and cost effectively. Sun-tracking errors due to installation defects of the 25 m2 prototype solar concentrator have been analyzed from recorded solar images with the use of a CCD camera. With the recorded data, misaligned angles from ideal azimuth-elevation axes have been determined and corrected by a straightforward changing of the parameters' values in the general formula of the tracking algorithm to improve the tracking accuracy to 2.99 mrad, which falls below the encoder resolution limit of 4.13 mrad