Multifactor ageing models - origin and similarities
The main models for combined thermal-electrical ageing of electrical insulation have a common origin in thermodynamics, and several of the models are essentially the same.
Materials Literature
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Effects of Various Collagen Crosslinking Techniques on Mechanical Properties of Collagen Film
We examined the relationship between collagen crosslinking techniques and dentinum reinforcement. In the present study, the tensile tests, imbibition test and antienzyme test were performed on collagen films mainly composed of type I collagen after ultraviolet irradiation and immersion in tannic acid and glutaraldehyd…
A model for asymmetry in magnetic property behavior under tensile and compressive stress in steel
Presents a way to relate two standard models for magnetomechanical hysteresis-the Sablik-Jiles-Atherton model and the Schneider-Cannell-Watts model-while at the same time presenting physical models for the asymmetry in magnetic property behavior under tensile and compressive stress in steel, including, for /spl sigma/…
Synthesis of drowning‐out crystallization‐based separations
Abstract A method is presented to synthesize drowning‐out crystallization‐based separation schemes for binary mixtures. The method tracks how the composition of each process stream changes from unit to unit on a phase diagram by assuming that the system is at equilibrium. Features of phase behavior favorable to drowni…
Enhancement of the photocyclization quantum yield of 2,2′-dimethyl-3,3′-(perfluorocyclopentene-1,2-diyl)bis(benzo[b]- thiophene-6-sulfonate) by inclusion in a cyclodextrin cavity
The photocyclization quantum yield of 2,2′-dimethyl-3,3′-(perfluorocyclopentene-1,2-diyl)bis(benzo[b]thiophene-6-sulfonate) is found to increase in aqueous solution after the addition of β- and γ-cyclodextrin, in which a photoreactive antiparallel conformation of diarylethene is favourably included.
Deposition of LaNiO3 thin films in an atomic layer epitaxy reactor
LaNiO 3 thin films have been deposited in an atomic layer epitaxy (ALE) reactor, using La(thd) 3 , Ni(thd) 2 and ozone as reactants, thereby proving the feasibility of the ALE technique to produce films of ternary oxides. Depositions were made on Corning glass in the temperature range 150–450 °C. The growth conditions…
Layered Ternary and Quaternary Metal Chalcogenides
Abstract The syntheses, crystal structures, and physical properties of some recently discovered layered ternary and quaternary chalcogenides are reviewed. One component of these systems is an alkali metal or thallium; another is a d‐, f‐, or p‐ block metal.
Changeover in a multimodal copper(ii) catenate as monitored by EPR spectroscopy
The electrochemically triggered rearrangement of a copper catenate is monitored by EPR spectroscopy; the initially generated tetrahedral copper(II) complex (with higher g-factor components and lower metal hyperfine splitting) is converted to a stable five-coordinate copper(II) species, within a few minutes at room tem…
Structures of photochemically prepared mixed-valence polyoxovanadate clusters: oblong [V18O44(N3)]14− , superkeggin [V18O42(PO4)]11− and doughnut-shaped [V12B32O84Na4]15 − anions
Three mixed-valence polyoxovanadates, Na 12 H 2 [V 18 O 44 (N 3 )]·30H 2 O 1, K 8.5 H 2.5 [V 18 O 42 (PO 4 )]·19H 2 O 2 and H 15 [V 12 B 32 O 84 Na 4 ]·13H 2 O 3 have been photochemically synthesized and characterized by X-ray single-crystal analysis and magnetic susceptibility measurements. The [V 18 O 44 (N 3 )] 14-…
Understanding and Controlling the Morphology of ZnO Crystallites under Hydrothermal Conditions
Abstract The morphological features of ZnO crystallites influenced by solution basicity under hydrothermal conditions have been studied from the standpoint of the incorporation of the growth units. A crystal chemistry approach is developed to understand and thus to control a desirable morphology of the crystallites. T…
Rational approach to the synthesis of meso–meso (5,5′) linked bis-porphyrins
A novel approach for the synthesis of 5,5′-directly linked metal-free bis-porphyrins is reported; McMurry type coup-ling of dipyrroketones (e.g. 1) leads to 1,1,2,2-tetra(2-pyrrolyl)ethene 2, which after tetra-formylation (to give 3) and MacDonald macrocyclization with a 1,9-di-unsubstituted dihydrodipyrrin 4, affords…
Ferroresonance in electromagnetic voltage transformers: A study based on nonlinear dynamics
Ferroresonance in electromagnetic voltage transformers, fed through circuit breaker grading capacitance, is studied using nonlinear dynamics methods. The magnetising characteristic of a typical 100 VA voltage transformer is represented by a single-valued two-term polynomial of the order seven. The system exhibits thre…
Electronic structure of cubicSrHfO3: Ferroelectric stability and detailed comparison withSrTiO3
Electronic structure calculations of cubic ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{SrHfO}}_{3}$ are presented. The full-potential linear augmented-plane-wave method is used and exchange-correlation effects are treated by the local-density approximation. The tendency to ferroelectricity of both compounds is explored and c…
Depolymerization−Liquefaction of Plastics and Rubbers. 1. Polyethylene, Polypropylene, and Polybutadiene
The solid superacid-catalyzed depolymerization−liquefaction (DL) reactions of high-density polyethylene (HDPE), isotactic polypropylene (PPR), and cis -polybutadiene (PB) samples were systematically investigated as a function of processing conditions, i.e., temperature (350−450 °C), time (0.5−3.0 h), H 2 pressure (500…
A new synthesis of pyrroles fused with polycyclic skeletons
The Diels–Alder reaction of β-sulfonylnitroethylene with cyclopentadiene, cyclohexadiene or substituted anthracenes followed by treatment with ethyl isocyanoacetate in the presence of DBU gives pyrroles fused with bicyclo[2.2.1]heptadiene and bicyclo[2.2.2]octadiene skeletons, or triptycene-types of pyrrole, respectiv…
Hydrothermal synthesis and structural characterization of [Cu(en)2]2Cu7Cl11: a three-dimensional open-framework copper halide with occluded [Cu(en)2]2+ cations
A new type of three-dimensional open-framework copper chloride, prepared simply by the hydrothermal treatment of CuCl 2 ·H 2 O and en, is built up from unusual chloride bridged Cu 4 tetramers connected by CuCl 3/3 units and has voids in the framework that are filled with charge-compensating [Cu(en) 2 ] 2+ cations.
Poly(l-alanylglycine): Multigram-Scale Biosynthesis, Crystallization, and Structural Analysis of Chain-Folded Lamellae
The biosynthesis of poly( l -alanylglycine) (poly(AG)) was performed in high cell density cultures of recombinant Escherichia coli . The purity of the material was determined by amino acid analysis, elemental analysis, and 1 H NMR spectroscopy. Fed batch fermentation increased the yield of recombinant protein from lev…
Free-standing mesoporous silica films; morphogenesis of channel and surface patterns
Extraordinary channel patterns have been observed in an oriented mesoporous silica film that is synthesized at the boundary between air and water. The basic channel designs comprise concentric circles, herringbones, fingerprints and hairpins. It is suggested that these patterns are spatio-temporal silicified recording…
Bis[4′-(4-anilino)-2,2′∶6′,2″- terpyridine]transition-metal complexes: electrochemically active monomers with a range of magnetic and optical properties for assembly of metallo oligomers and macromolecules
The new ligand 4′-(4-anilino)-2,2′∶6′,2″-terpyridine (L 1 ) and a range of its transition-metal complexes have been prepared. The crystal and molecular structures of L 1 and [CuL 1 2 ][PF 6 ] 2 have been determined. Model reactions show that L 1 and its transition-metal complexes can be functionalised with suitable or…
Textile Materials for Medical and Healthcare Applications
An important and growing part of the textile industry consists of the medical and related healthcare and hygiene sectors. The extent of the growth is due to the constant improvements and innovations in both textile technology and medical procedures. The aim of this review is to highlight the specific medical and surgi…