Materials Literature
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A computer-aided testing program for electrical apparatus (CATEA) is designed to test the performance of single and polyphase electrical devices. It has been applied to measure the losses of single- and three-phase AC and DC electrical machines, single- and three-phase transformers with linear and nonlinear loads. On-…
Chiroptical absorption and luminescence spectra are reported for a novel Os(II)−polypyridyl complex in which Os(II) is coordinated to one achiral bidentate ligand and a chiral quadridentate ligand. The achiral ligand is 4,4‘-dimethyl-2,2‘-bipyridine (DMbpy), and the chiral ligand is a bisbipyridine-type molecule forme…
Spirality arising from loop distortion in single-jersey knitted fabrics is discussed. Test methods for measuring fabric spirality in knitted fabrics are outlined. Results of an experimental investigation are statistically analyzed considering the effects of yarn/fabric construction factors on the spirality behavior of…
In order to clarify how the internal crack initiation site distributes according to microstructure in high-cycle fatigue, α-β or near α titanium alloys with various microstructure were subjected to fatigue test in liquid nitrogen. The internal crack initiation occurred longer than 105 cycles at 77 K. The initiation si…
Diffusion along grain boundaries (GBs) often controls the evolution of structure and properties of engineering materials at elevated temperatures. A knowledge of diffusion characteristics of GBs and deep fundamental understanding of this phenomenon are critical to many materials applications. The purpose of the presen…
Today's SOFC membrane electrolyte assemblies produced within the Siemens SOFC development program and tested in mixtures of water vapor with hydrogen or methane show a long-term degradation of 20μV/h. This is still 10 times the rate required for a commercial application. As optical and electron micrographs of aged cel…
The heats of decomposition of γ-AgMg 4 and e'-Ag 17 Mg 54 have been measured as 1800 ± 200 Jmol -1 for the peritectoid reaction γ → (Mg) + e' at 469°C and 19 ± 1 kJmol -1 for the peritectic reaction e' → β' + Liq at 491°C. A thermodynamic assessment of phase data for the full range of the Ag-Mg binary alloy system rep…
Heteronuclear complexes of Ln[FexCo1-x(CN)6]⋅4H2O (Ln=Pr-Yb) were synthesized and their thermal decomposition products were investigated. Thermal decomposition of the complexes results in the formation of perovskite-type oxides for Ln=Pr-Gd even at 800°C. The lattice parameters, a-, b- and c-lattice constants (crystal…
A new aging model for thermal-electrical aging is proposed. The combined effect of temperature and partial discharges was investigated using epoxy samples. The new model is based on measurements of void gas pressure and time-to-breakdown experiments. This approach is quite opposite to other aging models in that the ne…
Partial discharge transients can be described in terms of the charge induced on the detecting electrode. The influence of the void parameters upon the induced charge is examined and discussed for spheroidal voids. It is shown that a quantitative interpretation of the induced charge requires a knowledge not only of the…
A quantitative description of transition-metal bonding has been obtained through combined analysis of 9(1) K X-ray and 13(1) K time-of-flight neutron diffraction data. It is shown that a simple valence-orbital model is too crude an approximation adequately to describe the electron-density distribution of Ni(ND 3 ) 4 (…
The liquid‐crystalline behavior of rod‐like mesogens is normally associated with the formation of smectic layer structures. However, it is shown that the introduction of large hydrophilic groups in a lateral position, such as in the Figure, can lead to columnar mesophases. The formation of columnar mesophases by rod‐l…
We investigate critical points of the free energy E ε (u) of the Cahn–Hilliard model over the unit square under the constraint of a mean value ü. We show that for any fixed value ü in the so-called spinodal region and to any mode of an infinite class, there are critical points of E ε (u) having the characteristic symm…
Possible grain boundary structures and distributions in monoclinic zirconia are discussed. Crystallogeometrical analysis was employed to evaluate some special, low-energy boundaries in the material. A computer simulation was then used to model the grain boundary misorientation and character distributions based on cert…
Singlet oxygen (1O2), a highly reactive and toxic intermediate, may play a role in photo-induced aging. We examined singlet oxygen generation from hematoporphyrin (HP) with UV-A, by monitoring the emission at 1,268 nm corresponding to 1O2 --> 3O2. Singlet oxygen was formed HP-dose-dependently in this system. We then i…
Single-crystal magnetisation and polarised neutron diffraction (PND) measurements have been made for the complex cis-[ReCl 4 (NHCMeNHPh) 2 ]. At higher temperatures the magnetic behaviour is typical of such a rhenium-(IV) complex, with three unpaired spins (µ = 3.6 µ B ), an almost isotropic g-tensor of 1.86(1) and a…
Three N,N″-bis(amide) derivatives of H 5 dtpa (diethylenetriamine-N,N,N′,N ″,N″-pentaacetic acid), H 3 L 1 = bis- (isopropylamide), H 3 L 2 = bis(tert-butylamide) and H 3 L 3 = bis(benzylamide), were synthesized. Their protonation constants were determined by potentiometric titration in 0.10 mol dm -3 KCl and by NMR p…
In-situ deposition of conducting polypyrrole thin films on an insulating substrate has been achieved by chemical polymerization of pyrrole on a modified surface. The surface modification agent was a silane compound bearing a pyrrole group; C 4 H 4 NC 3 H 6 Si(OMe) 3 which attached to the SiO 2 -Si surface via molecula…
Mechanical damage to thin, protective oxide layers arises principally in service from differential strains produced by temperature changes. For typical alumina- or chromia-forming alloys, in-plane tensile stresses are developed within the oxide layer during upward temperature transients and compressive stresses are pr…
Liquid crystalline alkane-3,4-dienoates (allenylacetates) have been synthesized. Most compounds incorporate a heterocyclic 1,3,4-thiadiazole ring or a pyrimidine ring as a constituent of the rigid core. These axial chiral allene derivatives were at first obtained as racemic mixtures. Some of them were also synthesized…