Verfahrung zur Bestimmung der Erwärmung des NDZ-Durchströmteils bei sehr kleinen Dampfdurchsätzen

1. Weil die Laufschaufeln länger und mehr Stufen vorhanden sind, ist der Erwärmungspegel im Niederdruckzylinder (NDZ) der Turbine T-250/300-240 doppelt bis dreimal so groß wie der im NDZ der Turbine T-100/120-130. 2. Liegt kein Durchsatz an Betriebsdampf vor, tritt die maximale Erwärmung in den ersten NDZ-Stufen auf und erreicht (im Trockendampf) 163°C bei der Turbine T-100/120-130 und 542°C bei der Turbine T-250/300-240. 3. Unter Betriebsbedingungen kühlt der Betriebsdampf praktisch immer die ersten Zylinderstufen. 4. Die Wirkung des Betriebsdampfes auf den Wärmezustand der Stufen nimmt zur Kondensatorseite hin ab. 5. Neben den radialen Temperaturgefällen in den Laufschaufeln treten in den Fußquerschnitten beträchtliche Temperaturgefälle auch in axialer Richtung auf: dieses Gefälle ist besonders groß in der letzten Stufe. Abschließend sei bemerkt, daß man den allgemeinen Temperaturpegel in den genannten Fällen so begrenzen kann, daß die Dampfwerte von Kondensatorseite gK her auf Sättigungsniveau gehalten werden, dies auch durch Verminderung von alpha-tau. Liegt kein Betriebsdampfdurchsatz vor und ist der ättigungsdampfdruck im Kondensator zulässig, betragen die maximalen Temperaturen im NDZ der Turbine T-1 00/120-130 243°C und der Turbine T-250/300-240 602°C. Sie stellt man im Bereich der Endstufen fest

Determination of the Michel Parameters rho, xi, and delta in tau-Lepton Decays with tau --> rho nu Tags

Using the ARGUS detector at the $e^+ e^-$ storage ring DORIS II, we have measured the Michel parameters $\rho$, $\xi$, and $\xi\delta$ for $\tau^{\pm}\to l^{\pm} \nu\bar\nu$ decays in $\tau$-pair events produced at center of mass energies in the region of the $\Upsilon$ resonances. Using $\tau^\mp \to \rho^\mp \nu$ as spin analyzing tags, we find $\rho_{e}=0.68\pm 0.04 \pm 0.08$, $\xi_{e}= 1.12 \pm 0.20 \pm 0.09$, $\xi\delta_{e}= 0.57 \pm 0.14 \pm 0.07$, $\rho_{\mu}= 0.69 \pm 0.06 \pm 0.08$, $\xi_{\mu}= 1.25 \pm 0.27 \pm 0.14$ and $\xi\delta_{\mu}= 0.72 \pm 0.18 \pm 0.10$. In addition, we report the combined ARGUS results on $\rho$, $\xi$, and $\xi\delta$ using this work und previous measurements.Comment: 10 pages, well formatted postscript can be found at http://pktw06.phy.tu-dresden.de/iktp/pub/desy97-194.p

A Search for the Electric Dipole Moment of the Tau-Lepton

Using the ARGUS detector at the e+e- storage ring DORIS II, we have searched for the real and imaginary part of the electric dipole formfactor d_tau of the tau lepton in the production of tau pairs at q^2=100 GeV^2. This is the first direct measurement of this CP violating formfactor. We applied the method of optimised observables which takes into account all available information on the observed tau decay products. No evidence for CP violation was found, and we derive the following results: Re(d_tau)=(1.6+-.9)*10^(-16) ecm and Im(d_tau)=(-0.2+-0.8)*10^(-16) ecm, where statistical and systematic errors have been combined.Comment: 8 pages, 5 figures (10 subfigures

Evaluating correspondence of Russian science to international standards of research in conditions of self-isolation: issues and potential solutions

There has been completed an evaluation of the share of internationalized publications written by Russian scientists in 2014. It was demonstrated that no more than 8–10% of scientific publications written by Russian scientists, indexed in the National index of scientific citation, were reflected in international bibliometric data bases Web of Science and Scopus and only half of those were cited in the first three years after publication. The share of domestic publications, accessible to international scientific community is estimated in 5%.Based on the presented data, it was assumed that self-isolation of Russian science is progressing. It is was noted, that in circumstances when 95% of publications by Russian scientists remain inaccessible to an international scientific community and when there is no feedback received in the form of citations of presented outcomes, evaluating correspondence of the latter to international standards of research is significantly difficult. In order to identify the scientific capacity of Russian scientists, and to see how it is matching international frontlines of research, it is suggested to use methods of linguistic and semantic analysis on the basis of Exactus Expert system

Imitating Modeling of destruction process of polymer

In work the approach to modelling of molecular-structural characteristics of polymers during process thermooxidizing destruction is considered, for a basis imitating modelling of stochastic processes of destruction of macromolecules of polymer is accepted

A study of drift chamber ageing with propane

Wire ageing effects observed in the ARGUS drift chamber are described, as well as results of laboratory studies of ageing in a small test chamber. The tests were performed under realistic conditions with small anode currents of about 14 nA. In normal purity propane a gain drop of about 1000%/(C/cm) is observed. After the accumulation of 0.01 C/cm on the anode wire, discharges begin. Purification of the propane with Oxisorb or the addition of 0.2% water vapour reduces the gain drop to about 100%/(C/cm). No discharges are observed in this case, even after irradiation of 0.2 C/cm. The addition of water vapour can also rehabilitate a chamber damaged by radiation