Abstract Es wird eine Übersicht über die Ergebnisse der Bestimmungen funktioneller Gruppen und IR‐spektroskopischen Befunde bei auf verschiedene Weise hergestellten Graphitoxid(GO)‐Präparaten gegeben. Auf Grund dieser ein neues Strukturmodell entworfen, das keinen Äthersauerstoff enthält gewellte Kohlenstoffnetze aufweist, in denen periodisch CC‐Bindungen unterbrochen sind. Das Modell Hydroxylgruppen Carbonylgruppen verschiedener Umgebung. Elektronenbeugung Adsorptionsversuche weisen darauf...

Abstract Plasmonic devices, made of apertures or antennas, have played significant roles in advancing the fields optics and opto-electronics by offering subwavelength manipulation light visible near infrared frequencies. The development heat-assisted magnetic recording (HAMR) opens up a new application plasmonic nanostructures, where they act as field transducers (NFTs) to locally temporally heat sub-diffraction-limited region medium above its Curie temperature reduce coercivity. This allows...

The negative parity levels of odd-even nuclei with protons and neutrons in the $1{f}_{\frac{7}{2}}$ shell are calculated using strong-coupling symmetric-rotator model including Coriolis coupling between bands. single-particle energy wave functions deformed well computed for a spin-orbit strength $C=\ensuremath{-}0.26\ensuremath{\hbar}{\ensuremath{\omega}}_{0}$ which is consistent observed splitting ${\mathrm{Ca}}^{41}$. well-flattening parameter $D$ taken to be...

Low-lying positive- and negative-parity states of odd isotopes Ga, As, Br, Rb in the mass region bounded by $30<Z<38$ $40\ensuremath{\le}N\ensuremath{\le}48$ have been calculated Coriolis coupling model with incorporation a residual interaction pairing type calculating intrinsic states. The single-particle energy levels wave functions are first computed deformed well spin-orbit strength $\ensuremath{-}0.26\ensuremath{\hbar}{\ensuremath{\omega}}_{0}$ for well-flattening parameter $D$...

We have studied magnetic vortex oscillations in soft submicron cylindrical dots with variable thickness and diameter by an analytical approach micromagnetic simulations. considered two kinds of modes the magnetization oscillations: (1) low-frequency translation mode, corresponding to movement as a whole near its equilibrium position (2) high-frequency modes, which correspond radially symmetric magnetization, mainly outside core. The translational eigenmode was calculated numerically...

Abstract Graphitoxid entsteht aus Graphit und leicht Sauerstoff abgebenden Oxydationsmitteln nur dann, wenn der zuerst zum Graphitsalz (C A − · 2 HA) oxydiert wird. Die weitere Oxydation verläuft um so schneller vollständiger, je mehr Wasser die Oxydations‐mischung enthält, wobei jedoch eine kritische Konzentration, bei Graphitsalze zersetzt werden, nicht überschritten werden darf. In konz. HClO 4 gelingt auch elektrochemische zu Graphitoxid. Bei Bildung von geht nahezu kein Kohlenstoff...

Abstract Bei der Messung des Verpuffungspunktes eines Graphitoxid‐Präparates ist zu beachten, daß die Verpuffung infolge mit Abgabe innerkristallin gebundenen Quellwassers verbundenen Wärmeverlustes verzögert wird. Die langsame thermische Zersetzung unterhalb verläuft exotherm; bei langsamem Erhitzen steigt Temperatur im Präparat schneller als in Umgebung. Herstellungsweise hat großen Einfluß auf Verpuffungstemperatur. Verunreingungen können den Verpuffungspunkt erheblich herabsetzen.

The energy levels, static moments, and transition rates of ${\mathrm{V}}^{51}$ have been investigated using the strongcoupling symmetric-rotator model. Nilsson's levels wave functions in $1f\ensuremath{-}2p$ shell are recomputed for a well depth corresponding to $\ensuremath{\hbar}{\ensuremath{\omega}}_{0}=\frac{41}{{A}^{\frac{1}{3}}}$ MeV spin-orbit strength $C=\ensuremath{-}0.26\ensuremath{\hbar}{\ensuremath{\omega}}_{0}$ appropriate shell. shell-model level ordering at zero deformation...

The magnetic dipole and electric quadrupole moments reduced transition probabilities have been computed for the Coriolis-coupling model using wave functions obtained in an earlier paper. These were from a linear combination of ten rotational bands based on available single-particle core excited states $1f\ensuremath{-}2p$ shell, corresponding eigenvalues consistent with observed level spectra odd nuclei $1{f}_{\frac{7}{2}}$ shell. rates predicted here are also good agreement experiment....

Abstract Drei verschiedene Darstellungsverfahren für Graphitoxyd wurden verbessert und die erhaltenen Präparate miteinander verglichen. Das älteste, von Brodie beschriebene Oxydationsverfahren liefert fast weißes, sehr stabiles Graphitoxyd, das sich im Verpuffungspunkt, Schichtabstand in seiner spezifischen Oberfläche den auf andere Weise hergestellten Präparaten unterscheidet.

The magnetization reversal process of Co nanowires was investigated using a moving mesh technique. nucleation and expansion reversed domains is calculated by solving the Gilbert equation motion for different damping constants. adaptive finite element method reduces total CPU time more than factor 4 as compared to uniform mesh. Two domain wall types are observed. For wire diameter d=10 nm transverse walls occur gyromagnetic precession limits velocity. velocity increases from 50 520 m/s...

A systematic study of the cross sections for $K$-shell ionization by 2.0-MeV-electron impact has been made as a function atomic number. The 32 elements from V ($Z=23$) to Bi ($Z=83$) were first measured relative each other, and then normalized 43 b at Sn ($Z=50$). Thus errors usually associated with absolute measurements minimized did not obscure minor variations in $Z$ dependence sections. values drop 353 9.9 Bi. general trend data is agreement theoretical predictions Kolbenstvedt. However,...

The ($^{3}\mathrm{He}$,$d$) reaction on $^{70,72,74,76}\mathrm{Ge}$ has been studied at 17-MeV incident energy. In all four isotopes, a ${\mathrm{\textonehalf{}}}^{+}$ state is observed about 600 keV above the low-lying ${\frac{9}{2}}^{+}$ isomeric state. presence of these states provides convincing argument in favor validity rotational model with prolate deformation and strong Coriolis coupling this region periodic table.