Molecular hydrogen in a-si:H

It is demonstrated that in high quality hydrogenated amorphous silicon films nearly 40% of the contained hydrogen is in the form of hydrogen molecules individually trapped in the amorphous equivalent of tetragonal T sites. The majority of these molecular hydrogens are in the less-clustered component of the contained hydrogen. These results could have major implications for the understanding of light-induced defects and hydrogen mobility.     

X-ray spectroscopy at PSI

Crystal spectroscopy of the X-rays of exotic atoms started with a series of experiments using transmission spectrometers. Experiments at lower energies were made possible by the development of reflection spectroscopy. The progress made is illustrated with a measurement of the pion mass and the determination of strong interaction effects in pionic hydrogen isotopes. Modern developments aim at a determination of the strong interaction width on the level of %. The way to reach this goal is presented and the limits of the method and possible future experiments are discussed. This revised version was published online in August 2006 with corrections to the Cover Date.     

Über die Einwirkung des alkoholischen Kalis auf den Isovaleraldehyd

Ohne ZusammenfassungIch nehme mit Freuden die Gelegenheit wahr, am Schlusse dieser Mittheilung meinem hochverehrten Lehrer, Herrn Hofrath Lieben, für das lebhafte Interesse, das er dieser Arbeit entgegenbrachte, und für die stete Förderung derselben mit Rath und That, meinen tiefgefühlten Dank auszusprechen.     

Bemerkung über einen die Anzahl der Primzahlen eines bestimmten Intervalles betreffenden Satz des Herrn J. J. Sylvester

Ohne Zusammenfassung     

Die Anzahl der von einander verschiedenen cyclischenE-Beziehungen auf einem Träger vom Geschlechte Eins,welchen-elementige Cyclen liefern

Ohne Zusammenfassung     

Untersuchung von Fetten

Ohne Zusammenfassung     

Aerodynamic and Acoustic Characteristics of Voice in Prader-Willi Syndrome

Prader-Willi syndrome (PWS) is a multisystem disorder caused by DNA abnormalities involving chromosome 15. Major characteristics are infant hypotonia, hypogonadism, mental retardation, a short stature, atypical facial appearance, and the onset of obesity due to insatiable hunger in early childhood. Also, speech and language abnormalities have been reported including voice disorders. These have seldom been studied in detail, however. This paper reports the results of an acoustic and aerodynamic investigation of the voice in 22 individuals with PWS. Two age groups were distinguished, a group of children [chronological age (CA) 6 years, 7 months through 11 years, 7 months; total intelligence quotient (TIQ) 40-88] and a group of adolescents and adults (CA 17 years, 1 month through 29 years, 5 months; TIQ 41-94). Both aerodynamic and acoustic parameters were obtained and compared with normative data from the Belgian Study Group on Voice Disorders. It was found that voice difficulties do commonly occur in individuals with PWS including impairment of frequency levels, voice quality, and poor aerodynamic capabilities.