Novel merocyanine dyes are converted into the spiropyran form by irradiation with visible light
New photochromic spiropyrans existing in a stable coloured form are prepared from merocyanine dyes by irradiation with visible light.
Materials Literature
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Environmental aging and stress‐cracking of poly(ethylene terephthalate)
Abstract The environmental stress‐cracking behavior of poly(ethylene terephthalate), PET, has been studied by exposing PET sheet samples to a stress‐cracking liquid, at constant stress, for various periods of time. Samples evaluated are of equivalent molecular weights but vary in copolymer concentrations. The characte…
Dielectric Properties of a Polymer-Dispersed Liquid Crystal Film
Dielectric properties of a polymer-dispersed liquid crystal (PDLC) film comprising of liquid crystal, octyl cyanobiphenyl (K-24) and polymethyl methacrylate (PMMA) are reported as a function of frequency (100 Hz-1.0 MHz) in the temperature range of 25°C to 45°C. A dielectric dispersion in the low frequency region (∼1…
Corrosion inhibition of OFHC copper by prefilming with organic compounds
As part of research on corrosion phenomena in the oxygenfree high conductivity (OFHC) copper pipes of the stator cooling circuit of a power plant turboalternator and the possibility of using copper inhibitors, some prefilming systems have been investigated, taking the common treatments with benzotriazole as a starting…
Miscibility of thermoplastic polyurethane elastomers with chlorine‐containing polymers
Abstract The miscibility behaviours of thermoplastic polyurethane elastomers (TPUs) with chlorine‐containing polymers were studied. Four kinds of TPUs containing 20, 40, 60 and 80wt% of poly(caprolactone) (PCL) diol as a soft segment were used for blending. Poly(vinylidene chloride‐co‐vinyl chloride) (P(VDC‐VC)) with…
Dielectric breakdown of ceramics and glass ceramics
Discusses the AC dielectric breakdown of alumina, aluminium nitride and cordierite glass ceramics (MgO-Al/sub 2/O/sub 3/-SiO/sub 2/) at room temperature. The importance of specimen shape, thickness, surface finish and test conditions are assessed. For dielectric breakdown tests specimens were prepared in the form of 2…
Factorial Design Techniques Applied to Optimization of AMS Graphite Target Preparation
Many factors influence the preparation and quality of graphite targets for 14 C accelerator mass spectrometry (AMS). We identified four factors (sample size, H 2 pressure, catalyst temperature and pretreatment time) as potentially critical, and investigated their effects on two particular characteristics: the integrat…
Reduced corrosion of CP Ti and Ti-6A1-4V alloy endosseous dental implants after glow-discharge treatment: a preliminary report.
Inductively coupled argon plasma spectroscopic analysis was used to quantify titanium, aluminum, and vanadium corrosion products released by superficial layers of identically shaped commercially pure titanium and Ti-6A1-4V alloy dental implants. Halves of each of two originally sterile groups were analyzed directly fr…
Terminal Ballistics Test and Analysis Guidelines for the Penetration Mechanics Branch
The principal mission of the Penetration Mechanics Branch (PMB) of the Terminal Ballistics Division (TBD) of the Ballistic Research Laboratory (BRL). Aberdeen Proving Ground, MD, is research and development leading to improvements in the terminal ballistic performance of kinetic energy (KE) long rod penetrators. This…
Effect of added Cu on the Nd-rich phase in hot-deformed NdFeB magnets
The addition of Cu greatly improve the hot workability of cast Pr(Nd)FeB magnets, which makes possible the production of aligned magnets by hot deformation of the cast structures. Substantial amounts of a liquid phase identified as the Pr (Nd)-rich phase are extruded from these materials during hot deformation. Howeve…
Effects of cation distribution on the magnetic and electrical properties of cobalt ferrite
Cobalt ferrite has the so-called inverse spinel structure, with one-half of Fe3+ions on A sites and the rest, together with Co2+ions, on B sites at room temperature. The cation distribution of the cobalt ferrite, however, has been reported to change through heat treatments. During the head-treatment, magnetic and elec…
Synthesis and structure of di-µ-oxo nitridotechnetium( VI ) dimers and a monomeric nitridotechnetium( V ) mixed-ligand complex
The di-µ-oxo technetium(VI) complexes [{TcN(S2CNEt2)}2(µ-O)2]1, [{TcN(S2CNC4H8)}2(µ-O)2]2, [AsPh4]2[{TcN(CN)2}2(µ-O)2]4 and [AsPh4]2[{TcN(edt)}2(µ-O)2]5(H2edt = ethane-1,2-dithiol) have been prepared either by reaction of [{TcN(OH2)3}2(µ-O)2]2+ or Cs2[TcNCl5] in Na4P2O7 solution with the appropriate ligand. The ESR sp…
Vacuum ultraviolet radiation/atomic oxygen synergism in fluorinated ethylene propylene Teflon erosion
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
A new method for the electrochemical preparation of highly crystalline poly (p-phenylene) films and their structural characterisation
Regular well-faceted crystals located on the inner side of homogeneous poly(p-phenylene) films with a relatively large degree of polymerisation have been prepared by electrochemical oxidation of benzene in concentrated H2SO4 without adding Lewis catalysts.
Tensile Properties and Deformation Mechanisms in Zirconium
The tensile properties and deformed microstructures of zirconium in the annealed condition have been investigated in both the rolling (RD) and transverse (TD) directions at three strain rates of 10−4, 10−3 and 10−2 s−1 at different temperatures in the range 298–673 K in order to understand the extent of anisotropy in…
Gelation of an aqueous fluorinated dye solution
The gelation of aqueous solutions of sodium 1-(3,5-bistrifluoromethylphenylazo)-2-hydroxy-6-naphthalenesulfonate is investigated by means of 19F NMR spectroscopy.
Phase behavior of poly(ε‐caprolactone)/ poly (vinylidene fluoride) blends
Abstract The miscibility of blends of poly (ε‐caprolactone) (PCL)/poly(vinylidene fluoride) (PVDF) was studied by measuring the cloud point, melting point depression and crystallization kinetics. Lower critical solution temperature (LCST) behavior was observed at PCL‐rich compositions, whilst it was not observed at hi…
Secondary-ion mass spectrometric analysis of anisotropic oxygen self-diffusion in barium hexaaluminate single crystals
Oxygen self-diffusion in a barium hexaaluminate (Ba0.75Al11O17.25) single crystal has been analysed by secondary-ion mass spectrometric analysis (SIMS) after diffusion annealing the sample in 18O2. Depth profiles of the isotopic concentration in the crystal showed that oxygen penetration normal to the c axis (⊥c) was…
Monte Carlo simulation study of crystallization in rapidly supercooled one-component plasmas
Development of solidification processes in rapidly supercooled one-component plasmas is studied by a Monte Carlo (MC) simulation method with a number of particles 1458. Evolutions of interparticle correlations and of local and extended bond-orientational orders are investigated microscopically. Layered structures emer…
Polymer dispersed liquid crystal infrared light shutter
We have developed a polymer dispersed liquid crystal (PDLC) device for operation in the midinfrared region of the electromagnetic spectrum. This device can be incorporated in thermal imaging systems that utilize pyroelectric vidicons for night vision applications. The infrared electro-optic properties of several PDLCs…