The 3.8% decrease in half-life of the 2.38-keV $sup 90$/subm/Nb isomer when Nb is converted from ... more The 3.8% decrease in half-life of the 2.38-keV $sup 90$/subm/Nb isomer when Nb is converted from metal to a fluoride complex is one of the largest reported chemical effects on the internal conversion process. Experimental and theoretical evidence is presented that this effect is not due, as had been conjectured, to the ''switching off'' of L$sub 3$ conversion through increased L$sub 3$ binding energy. (AIP)
Eine eingehende Beschreibung des Mitralklappenprolaps-Syndroms (MPS) wurde erstmals 1963 von Barl... more Eine eingehende Beschreibung des Mitralklappenprolaps-Syndroms (MPS) wurde erstmals 1963 von Barlow vorgelegt. Auskultatorisch zeichnet es sich aus durch einen spatsystolischen Click mit haufig anschliesendem Crescendogerausch. Angiographisch ist es gekennzeichnet durch die Vorwolbung eines Mitralsegels, meist des posterioren, in den linken Vorhof wahrend der Systole mit spatsystolischem Reflux (2, 3, 15). Auserdem finden sich bei etwa 80 % der Patienten bizarre Verformungen des Laevogramms in der Systole (12). Bei etwa einem Drittel der Patienten bestehen EKG-Anomalien (1, 4, 5, 10, 14). Histologische Untersuchungen solcher Mitralklappen zeigten eine Verdickung und Vergroserung, vor allem des posterioren Segels, und Einlagerung von amorphem, myxomatosem Material in die kollagenen und elastischen Fasern (9, 11, 12, 13). Diese Befunde legen den Schlus nahe, das es sich beim Mitralklappenprolaps-Symdrom moglicherweise nicht nur um eine Erkrankung der Mitralklappe, sondern um eine Kardiomyopathie im weitesten Sinne handelt. Unsere Untersuchungen sollten deshalb dem Zweck dienen, nachzuprufen, ob sich eine entsprechende Veranderung der linksventrikularen Dynamik findet.
UVC LEDs exhibit high junction temperature (T J ) and voltage sensitivity, which influences their... more UVC LEDs exhibit high junction temperature (T J ) and voltage sensitivity, which influences their radiant power and lifetimes. This study of 275nm, 3-PAD UVC LEDs can be useful to estimate T J and emphasize the need for optimal thermal management.
Combustion in porous media burners presents considerable advantages over free flame burners due t... more Combustion in porous media burners presents considerable advantages over free flame burners due to several outstanding features inter alia clean and highly efficient combustion properties allowing a considerable amount of feedback energy from the flame area to preheat the mixture of fuel and air resulting in a considerable reduction of unavoidable pollutant formations appearing e.g. as the emission of CO and NOX. In addition, porous media burners are manufactured in highly compact small sizes suitable to industrial and household heating characteristic applications. Heat transfer between solid and gas depends mainly on the porous thermophysical properties of the component known as the solid matrix. These systems are characterized by the formation of a combustion flame pulse or wave which can travel inside the burner, depending on the operating conditions at velocities of about 0.1 mm/s. In this paper, a new temperature tracking scheme is proposed based on digital image processing to ...
Abstract So far, when conversion coefficients have been introduced in the calculation of intensit... more Abstract So far, when conversion coefficients have been introduced in the calculation of intensity ratios of muonic atoms, only the “no-penetration” approximation has been made. Firstly we formulate the theory of Auger coefficients, including penetration effects, for both bound-bound and free-bound transitions and secondly we investigate some special E1 transitions in muonic 205 T1. The penetration effects describing the overlap of the muon transition charge and transition current densities with those of the converted electron are found to be rather important in magnitude.
The 3.8% decrease in half-life of the 2.38-keV $sup 90$/subm/Nb isomer when Nb is converted from ... more The 3.8% decrease in half-life of the 2.38-keV $sup 90$/subm/Nb isomer when Nb is converted from metal to a fluoride complex is one of the largest reported chemical effects on the internal conversion process. Experimental and theoretical evidence is presented that this effect is not due, as had been conjectured, to the ''switching off'' of L$sub 3$ conversion through increased L$sub 3$ binding energy. (AIP)
Eine eingehende Beschreibung des Mitralklappenprolaps-Syndroms (MPS) wurde erstmals 1963 von Barl... more Eine eingehende Beschreibung des Mitralklappenprolaps-Syndroms (MPS) wurde erstmals 1963 von Barlow vorgelegt. Auskultatorisch zeichnet es sich aus durch einen spatsystolischen Click mit haufig anschliesendem Crescendogerausch. Angiographisch ist es gekennzeichnet durch die Vorwolbung eines Mitralsegels, meist des posterioren, in den linken Vorhof wahrend der Systole mit spatsystolischem Reflux (2, 3, 15). Auserdem finden sich bei etwa 80 % der Patienten bizarre Verformungen des Laevogramms in der Systole (12). Bei etwa einem Drittel der Patienten bestehen EKG-Anomalien (1, 4, 5, 10, 14). Histologische Untersuchungen solcher Mitralklappen zeigten eine Verdickung und Vergroserung, vor allem des posterioren Segels, und Einlagerung von amorphem, myxomatosem Material in die kollagenen und elastischen Fasern (9, 11, 12, 13). Diese Befunde legen den Schlus nahe, das es sich beim Mitralklappenprolaps-Symdrom moglicherweise nicht nur um eine Erkrankung der Mitralklappe, sondern um eine Kardiomyopathie im weitesten Sinne handelt. Unsere Untersuchungen sollten deshalb dem Zweck dienen, nachzuprufen, ob sich eine entsprechende Veranderung der linksventrikularen Dynamik findet.
UVC LEDs exhibit high junction temperature (T J ) and voltage sensitivity, which influences their... more UVC LEDs exhibit high junction temperature (T J ) and voltage sensitivity, which influences their radiant power and lifetimes. This study of 275nm, 3-PAD UVC LEDs can be useful to estimate T J and emphasize the need for optimal thermal management.
Combustion in porous media burners presents considerable advantages over free flame burners due t... more Combustion in porous media burners presents considerable advantages over free flame burners due to several outstanding features inter alia clean and highly efficient combustion properties allowing a considerable amount of feedback energy from the flame area to preheat the mixture of fuel and air resulting in a considerable reduction of unavoidable pollutant formations appearing e.g. as the emission of CO and NOX. In addition, porous media burners are manufactured in highly compact small sizes suitable to industrial and household heating characteristic applications. Heat transfer between solid and gas depends mainly on the porous thermophysical properties of the component known as the solid matrix. These systems are characterized by the formation of a combustion flame pulse or wave which can travel inside the burner, depending on the operating conditions at velocities of about 0.1 mm/s. In this paper, a new temperature tracking scheme is proposed based on digital image processing to ...
Abstract So far, when conversion coefficients have been introduced in the calculation of intensit... more Abstract So far, when conversion coefficients have been introduced in the calculation of intensity ratios of muonic atoms, only the “no-penetration” approximation has been made. Firstly we formulate the theory of Auger coefficients, including penetration effects, for both bound-bound and free-bound transitions and secondly we investigate some special E1 transitions in muonic 205 T1. The penetration effects describing the overlap of the muon transition charge and transition current densities with those of the converted electron are found to be rather important in magnitude.
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