Calculation of the surface critical field Hc3 for a cylindrical cavity

The linearized Landau-Ginzburg equation is used to calculate H_c3 for a cylindical cavity in a type II material H_c3 exhibits oscillations as a function of the cavity radius R when R is if the order of the coherence length. H_c3 increase to the Saint-James and De Gennes limit for large R.     

Untersuchung des ZerfallsBi^{212} (ThC)\xrightarrow{\beta }Po^{212} (ThC')\xrightarrow{\alpha }Pb^{208} (ThD) durch (γ, α)-Koinzidenzen

Theγ-spektrum of Po²¹² (ThC′) has been measured by (γ, α)-coincidences with a fast-slow coincidence apparatus. The results are in excellent agreement with the conversion lines found by theLatyshev group. The absoluteγ-intensities have also been determined in order to get spins and parities of the levels by calculating the absolute conversion coefficients. Theβ-intensity leading to the exited states of Po²¹²(ThC′) is estimated to be about one third of that measured byBurde andRozner by (β, α)-coincidences. Threeγ-lines measured byChinaglia andDemichelis by (γ, α)-coincidences do not agree with our results. The 2⁺ assignment of the first exited state is now well established, but for the other levels in the decay scheme there is still some uncertainty concerning spin and level assignment.     

Hopping conductivity in C-implanted amorphous diamond,or how to ruin a perfectly good diamond

The electrical properties of amorphous diamond layers produced by C implantation are similar to those of deposited amorphous carbon films. This suggests that amorphous C consists of a mixture of diamond and graphite bonds irrespective of the preparation method.     

Localized and nonlocalized impurity states in amorphous germanium

The purpose of this study was to investigate which impurities form localized states in amorphous Ge and to study the concentration dependence of the effect. The low temperature resistivity of amorphous alloy films deposited at 77°K was well fitted by the relation $\text{ρ = ρ}{}_{\mathrm{<mtext>0\; </mtext><mtext>exp</mtext>}}\text{[(}\text{T}{}_0\text{T}\text{)}{}^{\mathrm{<mtext>1</mtext><mtext>4</mtext>}}\text{]}$. The increase in the number of localized states resulting from an increase in the number of impurities is evidenced by a decrease in T₀ Impurities which lead to shallow energy levels in the crystalline form do not form localized states near the Fermi level while impurities with deep lying levels do.     

Cinétique d'adsorption des centres catalytiques sur le TiO2

Sans résumé     

CePd2Ga3: A new ferromagnetic Kondo lattice

Various temperature-, pressure- and field dependent investigations on CePd₂Ga₃ indicate this ternary compound as belonging to the group of ferromagnetically ordered Kondo lattices, with the Curie temperatureT _C =6K and the Kondo temperatureT _K =4K. The first excited crystal field level of this hexagonal compound is about 40 K above the crystal field ground state, while the overall splitting is much larger.     

Kolloidwissenschaft

Zusammenfassung Die zunehmende Bedeutung moderner Kolloidwissenschaft wird an Hand einiger Beispiele aus den Gebieten der organischen Chemie, der Mineralogie, der Silikatwissenschaft, dem Studium antibiotischer Substanzen und der Medizin erklärt.Mit 18 Abbildungen.Prof. Dr.Alfons Klemenc aus Anlaß seines 70. Geburtstages gewidmet. Obwohl es nicht üblich ist, zu wissenschaftlichen Arbeiten ein Vorwort zu schreiben, hoffe ich, daß der Schriftleiter und auch die Leser dieser Arbeit mich verstehen werden. Prof. Dr.Alfons Klemenc war wirklich für meine Bildung auf der Wiener Universität in den Jahren 1918 bis 1921 verantwortlich. Dies und die Art, wie er mir half, über die Zeit nach der Rückkehr vom I. Weltkrieg zu kommen, werde ich ihm nie vergessen. Ebenso dankbar bin ich ihm für seine vielen Ratschläge und seine Hilfe während meiner Doktorarbeit. Er riet mir auch, die mir angebotene Assistentenstellung bei dem PhysikerMax Born in Göttingen anzunehmen. Dort lernte ichRichard Zsigmondy kennen, dem ich mein Interesse in Kolloidwissenschaft eigentlich verdanke. Dies ist der Grund, warum das Folgende Dr.Klemenc gewidmet ist.Ernst A. Hauser.     

Observation of long-lived muonic hydrogen in the 2S state

The kinetic energy distribution of ground state muonic hydrogen atoms mup(1S) is determined from time-of-flight spectra measured at 4, 16, and 64 hPa H2 room-temperature gas. A 0.9 keV component is discovered and attributed to radiationless deexcitation of long-lived mu p(2S) atoms in collisions with H2 molecules. The analysis reveals a relative population of about 1%, and a pressure-dependent lifetime (e.g., 30.4 +21.4/-9.7 ns at 64 hPa) of the long-lived mu p(2S) population, equivalent to a 2S quench rate in mu p(2S)+H2 collisions of 4.4 +2.1/-1.8 x 10(11) s(-1) at liquid-hydrogen density.     

Designer Self-Assembling Peptide Materials for Diverse Applications

Summary: Macromolecuar chemistry and polymer science have had an enormous impact in many areas of science, engineering, medicine and our daily life. It has not only changed our way of life forever, but also continuously to improve our living standard. Macromolecuar chemistry now also encompasses bioengineering, biomimetics, designer biological materials and nanobiotechnology. Here we summarize a few classes of short peptides that we discovered and invented with broad applications including 3D tissue cell culture, reparative and regenerative medicine, tissue engineering, slow drug release, stabilization of membrane proteins for develop nanobiotechnology and molecular devices. Molecular design using short peptides as new materials will play increasingly important role in biomedical research, nanobiotechnology, clinical science and medicine.