Materials Literature
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Near-infrared surface-enhanced Raman scattering (NIR SERS) spectra were obtained for 2,2-bipyridine, 5,6-benzoquinoline, pyrene, anthracene, and fluoranthene on SERS pre-activated thin-layer chromatography (TLC) plates by Fourier transform (FT) Raman spectroscopy. The pre-activation of TLC plates was based on a proced…
The behaviour of n- and p-type crystalline silicon wafers in quiescent concentrated aqueous HF solutions has been studied for immersion times up to 205 days. The etch rate, as determined from weighing experiments, decreased with time to values as low as after prolonged etching. The experimental findings are consistent…
A processable new thermosetting polymer containing carborane and siloxane groups with acetylenic linkages was examined for antioxidative properties during high-temperature oxygen exposure. Samples of the polymer were annealed in argon or air at 320–400°C or argon at 900°C and oxidized at 400 and 500°C. Their structure…
Compressional wave velocities ( V p ) have been determined up to 2350 K on CaSiO 3 , MgSiO 3 , CaMgSi 2 O 6 , CaAl 2 Si 2 O 8 and Ca 3 Al 2 Si 3 O 12 glasses and melts from Brillouin‐scattering experiments made with a 180° backscattering geometry. At the glass transition, the decrease of V p with increasing temperatur…
A coherent picture for the so-called rapid oscillation (RO) phenomena observed in ${(\mathrm{TMTSF})}_{2}X(X=\mathrm{Cl}{\mathrm{O}}_{4} \mathrm{and} \mathrm{N}{\mathrm{O}}_{3})$ is presented. By comparatively studying the two very similar systems, yet with quite different RO features, we have identified the origin of…
The axial intensity of axicons illuminated by a coherent wave usually exhibits rapid oscillations from diffraction on the sharp edges of the aperture of the element. These oscillations can be suppressed when the diffractive version of the axicon is illuminated from a polychromatic source. This possibility is examined…
Dielectric dispersion of the ferroelectric liquid crystal (CS-1022) around the SC∗-SA transition and temperature dependence of the spontaneous polarization were measured by varying the cell thickness. Behaviour of the dielectric constant is well described by a formula including the contribution of the soft mode, the G…
Mesa etched transmission line model (TLM) test structures with different contact lengths have been fabricated on heavily boron doped polycrystalline diamond films. The behavior of the contact and contact end resistance measurements can be fully explained using the TLM. No influence of the grain size on the contact res…
Abstract A novel method is presented for generating periodic surfaces. Such periodic surfaces appear in all systems which are characterized by internal interfaces and which additionally exhibit ordering. One example are systems of AB diblock copolymers, where the internal interfaces are formed by the chemical bonds be…
The intensity of photoluminescence from a thin layer of laser dye on a metallic grating depends on the polarization and angle of incidence of the incident beam of light. For an appropriate polarization and angle of incidence, the beam can resonantly excite surface plasmon polaritons (SPPs). The dye layer experiences a…
Quantitative fabric‐needle‐sewing machine interactions at different speeds have been used to construct qualitative rules mapping fabric properties to optimum sewing machine settings for the next generation of “intelligent sewing machines”, using model free estimation. The inference procedures of fuzzy logic have been…
Recently, it has been argued that a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn d level plays a crucial role in understanding the nonmetal-to-metal transition observed in the La(1-x)A(x)MnO(3) (A = Ca,Sr,Ba) system. We show, by neutron powder diffraetion, that La0.65Ca0.35…
The equilibrium shape of a blocked twin was determined by a calculation of the equilibrium positions of the discrete dislocations in the twin by means of a numerical solution. The critical stress required to place the leading two dislocations in a nascent tilt-wall configuration as well as the fraction of the total di…
Abstract Pseudomonassp. 61-3 accumulated poly(3-hydroxyalkanoates), P(3HA), in nitrogen-free media containing medium- and long-chain alkanoic acids or plant oils. The polyesters of 3HA units of even carbon numbers ranging from C4 to C12 were produced from the alkanoic acids of even carbon numbers, while those produced…
A novel type of PDLC display utilizing solid films obtained from the cellulose derivative hydroxypropylcellulose (HPC) with molecular weights of 60000 (HPC60000) and 100000 (HPC100000), cross-linked with two different di-isocyanates, 1,4-di-isocyanatobutane (BDI) and 1,6-di-isocyanatohexane (HDI), is presented. This k…
Mechanical effects dominate the new theory, with the build-up of strain, fatigue failures and fracture due to shock waves being involved.
Abstract Halogen‐free flame retardant additives based on phosphorus function by developing a protective char. A variety of additives are available, ranging from the element itself, in the form of amorphous red phosphorus, to specialty organophosphorus compounds, and examples of their use in a range of thermoplastics a…
The low-frequency elastic properties of incommensurate ferroelastic crystals [N(${\mathrm{CH}}_{3}$${)}_{4}$${]}_{2}$${\mathrm{CuCl}}_{4}$ are studied in the vicinity of the incommensurate phase transitions using parallel-plate-stress and three-point-bending methods. The temperature dependences of the effective elasti…
Thermal motions in a microscopic model for a strong glass (${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$) are studied by means of computer molecular dynamics simulations. A decomposition of the atomic dynamics in terms of normal modes allows the separation of the truly harmonic components of the generalized frequency distribut…
A model is presented for the formation of crystallographic tilting (misorientation) in highly mismatched (100) oriented zinc-blende semiconductor heteroepitaxial layers grown on vicinal substrates. The model is based on the asymmetric generation of 60° misfit dislocations upon island coalescence in the initial growth…