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Im 89. Lebensjahr starb am 28. Februar 1964 in Osnabrück der Mittelschulkonrektor i. R. Karl Koch. Seine Lebensaufgabe hat Karl Koch selbst in dem Vorwort zu seiner Flora des Regierungsbezirks Osnabrück umrissen: "Wenn das vorliegende Buch dazu beitragen möchte, die Kenntnisse unserer Heimatnatur zu erweitern und zu vertiefen, die Liebe zur Heimatscholle und zur heimischen Pflanzenwelt zu wecken, den Biologieunterricht zu beleben und zu befruchten und für den Gedanken des Natur- und Heimatschutzes zu werben und zu begeistern, so würde meiner Arbeit und der daran gewandten Mühe ein reicher Lohn beschieden sein." Karl Koch war ein Wissenschaftler von Rang. Dabei blieb er stets bescheiden und wusste in bester Weise die Arbeit seiner Freunde und Vorgänger in der Erforschung unserer niederdeutschen Heimat zu würdigen.
El complejo de la «Casa de la Industria Electrónica, en Frankfurt, comprende tres edificios principales: el edificio A, de tres plantas, situado en el centro, que aloja las oficinas de la Asociación VDE; el edificio B, que alberga las oficinas de la Asociación Alemana de Fábricas de Electricidad VDEW, y el edificio C, de siete plantas, que contiene las oficinas de la Asociación Central de la Industria Electrónica. Dichos edificios están unidos por otros más bajos, que alojan una sección de ensayos, sala de conferencias y el casino. Todo ello es de una diafanidad notable, y los materiales y sistemas empleados en su construcción son los más avanzados del momento.
Als 1959 das Büchlein "Die Vögel der Stadt Osnabrück" erschien, konnte unter Zurückstellung der Stadtrandgebiete nur der mehr oder weniger bebaute Teil der Stadt berücksichtigt werden. Es wurde Wert darauf gelegt, den Vogelbestand eines Stadtinnern in den verschiedenen Lebensräumen der Stadt, das Stadtvogelleben im Jahresablauf und die Bestandsänderungen durch den Landschaftswandel zu kennzeichnen. Ergänzend und abschließend sollen nun drei Landschaftseinheiten des Stadtrandes als Lebensraum von Vögeln zur Darstellung gelangen, und zwar 1. Kleingartenanlagen (Johannistorgärten-Süd), 2. Bruch (Rubbenbruch), 3. Mischwald (Heger Holz).
Gastropod molluscs were collected by the author between May and September 1962 from a variety of freshwater habitats in Ethiopia. Twenty-eight forms are represented in the collection of which a total of eleven have not been previously recorded from Ethiopia or have been recorded with doubt by previous authors. Two forms in each of the genera Bulinus and Ancylus appear to be new. It is considered that seven of the forms recorded from Ethiopia for the first time belong to the African component in the fauna, whereas only three are possibly of palaearctic origin. It is concluded that the wide distribution and diversity of some of the palaearctic forms justify the importance attached by Bacci (1951) to the palaearctic element in the molluscan fauna of the Ethiopian Plateau.
In heavy nuclei the damping of the giant resonance is due to thermalization of the energy rather than to direct emission of particles; the latter process is strongly inhibited by the angular-momentum barrier. The thermalization proceeds via inelastic collisions leading from the particle-hole state to two-particle-two-hole states. In heavy nuclei, several hundred such states are available at the energy of the giant dipole resonance. The rather large width of the giant resonance arises from the addition of many small partial widths of channels leading to the different two-particle-two-hole states. Both the density of the two-particle-two-hole states and the mean value of the interaction matrix elements between the particle-hole and two-particle-two-hole states are evaluated in a simplified square-well shell model. In a given nucleus the energy dependence of the widths is determined mainly by the density of states; the A dependence is determined mainly by the size of the matrix elements. For A ~ 200, we find 0.5 <= Γ <=2.5 MeV. The uncertainty in this value comes mostly from the uncertainty in the strength of the interaction. Representing the energy dependence of the width by a power law we find for the exponent the value ~ 1.8.
A method is developed for the calculation of resonant nuclear states which preserves as many features of the shell model as possible. It is an extension of the R-matrix theory. The necessary formulas are derived and a detailed description of the computational procedure is given. The method is valid up to the two-particle emission threshold. With the assumption of consecutive decay of the nucleus, the two-particle emission process can also be described. The treatment is antisymmetrized in all particles.
The unified model and the collective giant-dipole-resonance model are unified. The resulting energy spectrum and the transition probabilities are derived. A new approximate selection rule involving the symmetry of the γ vibrations is established. It is verified that the main observable features in the photon-absorption cross section are not influenced by the odd particle, despite the considerably richer spectrum of states as compared to even-even nuclei.