Materials Literature
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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…
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…
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…
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…
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…
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…
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.
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.
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…
The gelation of aqueous solutions of sodium 1-(3,5-bistrifluoromethylphenylazo)-2-hydroxy-6-naphthalenesulfonate is investigated by means of 19F NMR spectroscopy.
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…
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…
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…
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…
Abstract Blends containing polyethylene (LDPE, LLDPE, or LDPE‐LLDPE) with different weight percent of styrene‐isoprene‐styrene (SIS) triblock copolymers have been obtained by extrusion‐blowing. The morphology of the blends, investigated by scanning electron microcopy (SEM), has been related to composition but also to…
Information on the time-related criteria of the degradation of protective clothing materials after wear and laundering is lacking. The materials were obtained from three sources in the evaluation of the material changes due to wear and laundering. The materials consisted of FR wool, aramid, FR viscose blend and FR cot…
Two distinct Tafel regions are observed in the active region of the anodic polarization curve of iron in ammoniacal carbonate solution. A prepassive layer may form in the Tafel region at the higher overpotentials. A hydrogen oxidation peak is proposed to occur in the lower overpotential Tafel region. Anodic dissolutio…
Molecular dynamics simulation (MD) has been carried out for Li2SiO3 in the molten and glassy states. The parameters of the pair potential functions were determined by a trial and error method so that the results of X-ray diffraction analysis could be well reproduced. The changes in the structure and dynamic properties…
The luminescence properties under high-resolution excitation and emission conditions at 4.2 K of hydrated Gd3+ion-exchanged zeolite A are reported. From these luminescence measurements it is found that in a sample containing 0.8 wt.% Gd3+, only one site appears to be occupied by Gd3+. In a freshly prepared sample cont…
Fully dense compacts of SiC-AlN solid solution and composite were fabricated by the combination of reaction synthesis and hot isostatic pressing (HIP). Their strength and deformation behavior were investigated from room temperature to 1773 K by a Modified Small Punch (MSP) test which has been found to be suitable for…