Damage to Artesa slabs Latex-bitumen surface
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Materials Literature
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Prevention of ear damage during vibrating table concrete compaction
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The phase transformation and physical properties of the MnBi and Mn<inf>1.08</inf>Bi compounds
The phase transformation and magnetic properties of manganese bismuthide have been reinvestigated with single crystal samples of low temperature phase (LTP) and high temperature phase (HTP) in the quenched state (QHTP). It was established that the LTP and HTP are separate compounds with the chemical formulae MnBi and…
Dimerization of a linear Heisenberg chain in the insulating phases ofV1−xCrxO2
The nuclear magnetic resonance (NMR) of ${\mathrm{V}}^{51}$ has been studied in the series of compounds ${\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{2}$ between 100 and 350 K. Three insulating phases are clearly distinguished. In the low-temperature ${M}_{1}$ phase only one V site is seen with a posi…
A Charge Simulation Method for the Calculation of High Voltage Fields
A numerical method for the computation of electrostatic fields is described. The basis of the method is the use of fictitious line charges as particular solutions of Laplace's and Poisson's equations. Details are given of a digital computer program developed for field calculations by means of this method, and its appl…
Studies on the gill of Mytilus edulis : the eu-latero-frontal cirri
Abstract Adjacent eu-latero-frontal cirri beat alternately and alternate cirri exhibit metachronous activity. Each cirrus consists of 22─26 pairs of cilia arranged in two parallel but alternating rows. Individual cilia leave the shaft of the cirrus at regular (0.6 μm) intervals on each side to extend across the interc…
Coupling between nuclear Zeeman and electronic spin-spin interactions in dielectric solids
The theory of thermal mixing between nuclear Zeeman interactions and electronic spin-spin interactions of impurities in dielectric solids, used to interpret the mixing between the Zeeman interactions of two nuclear spin species as the result of their separate coupling with the electronic spin-spin reservoir. The predi…
Metallkomplexe mit Tetrapyrrol‐Liganden, X1) Synthese und Konfiguration weiterer (α,γ‐Dimethyl‐α,γ‐dihydrooctaäthylporphinato)metallkomplexe
Abstract Ausgehend von Metallkomplexen 1a, 1f–1m des Octaatlylporphins [(OAP)MXY (M = Zn, Pd, Pt, Ga, In, Mn, Ti, V, Si)] wurden weitere (a,y‐Dimethyl‐a,y‐dihydrooctaathylporphinato)metallkomplexe 2f–2n [(OxPMe2)MXY (M = Pd, Pt, Ga, In, Mn, Ti, V, Si, Sn)] dargestellt und spektroskopisch charakterisiert. Die reduziere…
Electron Spin Resonance of Lattice Defects in Zinc Oxide
ZnO powder samples sized from 500 to 3 μm are annealed in reducing and oxidizing atmosphere, thus creating geometrical lattice defects which in the paramagnetic case can be detected with ESR. Predominantly oxygen vacancies, oxygen at interstitial sites, and the coupling of these two kinds of defects correlated to the…
Photoexpansion and ``thermal contraction'' of amorphous chalcogenide glasses
Expansion due to illumination (photoexpansion) and contraction due to heat treatment (``thermal contraction'') of As–Se–(S)–Ge glass films have been observed utilizing the bimetal structures. This property is related to the reversible photodarkening effect of these chalcogenide glass films.
Ground and excited states of the diatoms CN and AlO
Multiconfiguration self-consistent field (MCSCF) wavefunctions are obtained for the ground and some low-lying valence excited states of the same symmetry for the diatomic systems CN and AlO. The spectroscopic constants of these states as well as their dipole moments as a function of the internuclear separation are als…
Optical conductivity studies in a one-dimensional organic metal: Tetrathiofulvalene tetracyanoquinodimethan (TTF) (TCNQ)
The optical properties of tetrathiofulvalene tetracyanoquinodimethan (TTF) (TCNQ) are reported in the visible and near infrared from room temperature to 4.2 K. The experimental results are analyzed in terms of simple Drude theory, with corrections made for anisotropic effects introduced by the anisotropic band structu…
Optical, electrical-transport, and heat-capacity studies of the solid solutionsTixTa1−xS2,ZrxTa1−xS2, andTixNb1−xSe2
The electrical resistivity and optical absorption of the layered dichalcogenides ${\mathrm{Ti}}_{x}{\mathrm{Ta}}_{1\ensuremath{-}x}{\mathrm{S}}_{2}$, ${\mathrm{Zr}}_{x}{\mathrm{Ta}}_{1\ensuremath{-}x}{\mathrm{S}}_{2}$, and ${\mathrm{Ti}}_{x}{\mathrm{Nb}}_{1\ensuremath{-}x}{\mathrm{Se}}_{2}$ ($0\ensuremath{\leqq}x\ensu…
Vibrational spectrum, torsional potential, and bonding of gaseous N2O4
The infrared spectrum of gaseous N2O4 was obtained under conditions which allowed study of both strongly and weakly absorbing features. These spectral features were assigned with the aid of vibration-rotation band shape theory. Weakly absorbing sequence bands were identified which contain torsional vibrations. The roc…
Frequency-addressed liquid crystal field effect
A new nematic material in which ε∥ exhibits a dielectric loss in the audio-frequency range is reported. At 25 °C Δ ε=(ε∥−ε⊥) reverses sign at 2.5 kHz and can be as positive as 6.2 at low frequencies and as negative as −2.2 at high frequencies; the activation energy for the loss is 0.91 eV. The availability of a dielec…
Structural studies of glassy CuAsSe2and Cu-As2Se3alloys
X-ray-diffraction radial-distribution, electron-spectroscopy-for-chemical-analysis (ESCA), crystallization, and differential-thermal-analysis (DTA) studies of glassy ${\mathrm{Cu}}_{x}{({\mathrm{As}}_{0.4}{\mathrm{Se}}_{0.6})}_{100\ensuremath{-}x}$ alloys, with 0 \ensuremath{\le} \ifmmode\times\else\texttimes\fi{} \en…
Driving force in electromigration
The driving force in electromigration is generally assumed to consist of a "direct force" due to the applied field and an "electron-wind" term due to momentum exchange with the current carriers. In the case of the "direct force" it is uncertain how effectively the charge is screened. In the case of the "electron wind"…
Bond-orbital model. II
The bond-orbital model is reformulated taking explicit account of the large overlap of two hybrids in the same bond rather than absorbing it in a pseudopotential. This gives a correction to the cohesive energy but other changes are absorbed in the ${V}_{1}$, ${V}_{2}$, and ${V}_{3}$ for each material. These parameters…
Electrical conductivity of tetrathiofulvalinium tetracyanoquinodimethan (TTF) (TCNQ)
The temperature dependence of the dc electrical conductivity of tetrathiofulvalinium tetracyanoquinodimethan (TTF)(TCNQ) measured along the crystallographic $a$, $b$, and ${c}^{*}$ axes and the corresponding anisotropies $\frac{{\ensuremath{\sigma}}_{\ensuremath{\parallel}}^{b}}{{\ensuremath{\sigma}}_{\ensuremath{\per…
Temperature dependence of transverse- and longitudinal-optic modes in Ti O 2 (rutile)
The temperature dependence of the infrared reflectivity of rutile, Ti${\mathrm{O}}_{2}$, is reported in the range 275-900 ${\mathrm{cm}}_{\ensuremath{-}1}$ and from room temperature up to 1500 K, for both the ${A}_{2u}$- and ${E}_{u}$-type mode spectra. Reflectivity spectra are fitted with the aid of a four-parameter…