Materials Literature
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ABSTRACT The Naval Surface Warfare Center Dahlgren Division has investigated technology for the Office of Naval Research (ONR) that has the potential to be very effective in defending Navy platforms against high‐speed, sea‐skimming anti‐ship cruise missiles (ASCMs). This technology uses a new kill mechanism, a wall of…
The ionization, stopping, and thermalization of hydrogen and boron beams, injected, respectively, in boron and hydrogen plasmas, is studied. The evolution of the charge state populations of the neutral beams is described considering the various ionization, excitation, and charge exchange channels. The interaction of t…
Abstract The effect of a Bosch injector on the mass distribution function of four viscosity improver (VI) polymers has been studied. Two of these, hydrogenated styrene—isoprene (HSI) and hydrogenated styrene—butadiene (HSB), are di‐block polymers, whereas the others are either comb‐like, polyalkyl methacrylate (PMA),…
This paper compares the rotomouldability and mechanical properties of conventional polyethylenes with metallocene polymers having a similar melt flowrate or the same density. The rotomouldability has been evaluated in terms of bubble removal, cycle times, and heat stability during the moulding process. The mechanical…
The self-assembly of a novel supramolecular cyclic polymer species of general formula [Ru 3 O(CH 3 COO) 6 (CO)(pz)] 6 has been achieved, by starting from μ-oxoruthenium cluster units in the presence of bridging pyrazine (pz) ligands.
Absolute intensities Deltai(q) of small-angle x-ray scattering (SAXS) and ultra-small-angle x-ray scattering (USAXS) were measured in a wide range of scattering vector q from 2x10(-4) to 0.5 A(-1) for transparent (VI-P) and translucent (VI-L) cellulose hydrogels prepared by coagulation and regeneration of viscose in a…
To investigate the role of body shape information on clothing size selection, a sample of 143 males were measured and sized using a computerized digital-image based measurement system. Clothing sizes were initially determined by the system using traditional criteria for the long sleeve shirt, jacket and trousers of a…
A novel series of liquid crystalline compounds, N-(2-hydroxy-4-n-alkoxy-benzaldehydeimino)-2-benzamidoethanamide (habbe) (alkyl = octyl, nonyl and decyl), derived from (N-benzoyl)glycylhydrazide, have been synthesized and characterized. Trivalent rare earth metal complexes of the type [Ln(habbe)2Cl2)Cl·2H2O] (where Ln…
We have developed a liquid crystal (LC) device that is totally controlled using light. The initial alignment is made by optically buffing the azopolymer film with two coherent argon laser beams. Surface relief gratings have been optically induced on an assembled cell filled with LC. A single linearly polarized argon l…
We apply a film thickness-independent technique to measure the index of refraction n=n+ik for amorphous thin films of molybdenum trioxide. The films were grown by thermal evaporation and then colored by light irradiation for different exposure times. Data for the reflectivity and differential reflectivity yield n and…
A novel theoretical approach is suggested for the description of phase transitions and structures observed in antiferroelectric smectic liquid crystals. Allowance is made for two possible types of ordering: short-pitch and long-pitch helical modes. The thermodynamic behavior of the material is treated as a result of t…
Structural and compositional changes of Co phthalocyanine (CoPc) films irradiated by ultraviolet (UV) light of 7.21 eV using an excimer lamp and the corresponding photo-oxidation process have been investigated. Optical absorption and X-ray photoelectron spectroscopy (XPS) measurements showed that the CoPc molecules in…
We have studied the optical transmission of one-dimensional Fibonacci-class quasiperiodic multilayers, which possess a mirror symmetry. We find that the transmission coefficient is unity for all studied sequences at the central wavelength λ = λ 0 , where λ 0 = (1/4) n A(B) d A(B) with n A(B) and d A(B) being the index…
Infrared and FT-Raman spectra have been obtained on pyridine adsorbed within two siliceous materials, silicalite and MCM-41. Both spectroscopic techniques detect the presence of weak physisorbed pyridine and stronger hydrogen-bonded pyridine. In particular, the FT-Raman spectra are well resolved and can be used to mea…
Abstract A series of push-pull type 4-phenylaminoazobenzene derivatives bearing an electron-withdrawing 4′-substituent were probed by electronic spectra in solution. The visible absorption maxima of these azobenzenes were correlated with the solvent parameters through the McRae theory as well as the solvent donor numb…
Thin films of MgFe 2 O 4 spinel on a (001) substrate of MgO have been heated to elevated temperatures in an applied electric field. The externally applied electric field produces a large driving force that influences the kinetic behavior of the spinel film and results in the formation of an MgO layer at the cathode du…
The crystal structure of the synthetic Ge-modification of the mineral natisite, Na 2 { TiOGeO 4 }, has been refined by X-ray diffraction method (a four-circle diffractometer, 2θ/θ scanning, Mo K α -radiation, θ max = 50°: a = 6.658(1), c = 5.161(1) Å, sp. gr. P 4/ nmm , Z = 2, ρ calcd = 3.58 g/cm 3 , R 1 = 0.030, s =…
The effect of heavy boron doping on local lattice strain around platelet oxide precipitates in Czochralski silicon wafers was investigated quantitatively by convergent beam electron diffraction (CBED). Lightly boron doped (p−) polished wafers, including platelet precipitates with density of about 5×109/cm3 and with an…
This work characterizes influence of moisture absorption on damping of tennis rackets. Three thermoset and one thermoplastic matrix composites were used for making the rackets. The first is a carbon/epoxy system, and the second is similar except that the epoxy is a polyurethane-modified type. The third is an interleav…
Ba(Ti1-xZrx)O3 (x = 0.15 and 0.2) single crystal fibers were grown by the laser heated pedestal growth (LHPG) technique. The XRD results show that the grown crystals are of single phase. Temperature dependence of dielectric permittivity, room temperature hysteresis loops and strain were measured. A broad permittivity…