Materials Literature
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Effects of the hot pressing parameters on the designing of structures and properties of hydroxyapatite/poly-L-lactide (HAp/PLLA) biocomposite blocks have been studied. Interdependences of temperature, pressure and time of hot pressing and the density, compressive strength, elasticity modulus were defined. Microstructu…
Abstract The decomposition of HCN over H-ferrierite below 670 K proceeded mainly by hydrolysis to NH3 and CO. In the presence of NO and NO2, NH3 formed further reacted to form N2 and N2O.
We have found that ZnO films consisting of epitaxially ordered arrays of closely packed hexagonal microcrystallites grown on vicinal (1000) sapphire exhibit biaxial in-plane optical anisotropy. The optical anisotropy resonance occurs near the band gap energy of ZnO. The line shape of the resonance is consistent with t…
Solid-state 13C NMR was utilized in analysis of the crosslink structure in silica-filled polyisoprene. Samples containing either a pre-coated coupling agent, a coupling agent added in the mixing process, or polyethylene glycol (PEG) were vulcanized and the type and density of crosslinking determined. The precoated cou…
An analytical 2-dimensional model taking account of the anisotropy of crystal growth is proposed to describe dendrite growth during directional solidification. Within a unit cell, a shape function of the dendrite is defined. This depends on the solidification condition, the local fraction solid and crystallographic or…
The morphology and size of Fe–Co rich particles in Alnico 8 specimens thermomagnetically treated at 800°C for various times have been investigated by means of transmission electron microscope (TEM) observations and small angle X-ray scattering (SAXS). Phases rich in Fe–Co and Ni–Al were formed during spinodal decompos…
Les effets d'un chauffage thermique continu sur les performances en terme de reflectivite de miroirs multicouches Mo/Si, Mo/C, Ni/C sont etudies. Les mesures de reflectivite autour de 100eV sont realisees en utilisant le rayonnement synchrotron de Super-ACO au LURE. Des variations de reflectivite en fonction de la tem…
The crystal structures of the new gallosilicate hydrosodalites Na 5 [Ga 0.8 Si 1.2O4 ] 6 (H 2 O) 8 was refined from X-ray powder data in the bodycentred space group I-43m: a = 884.15 pm, V = 0.6912 nm 3 , Z = 2, R WP = 0.063, R P = 0.048, R I = 0.014 for 6000 data points and 12 variable positional parameters. The stat…
Eight-year atmospheric corrosion tests of A 588B (UNS K12040) weathering steel were conducted in industrial, marine, and rural environments. The material was tested following two types of heat treatment: quenched-and-tempered to produce a tempered martensite microstructure and normalized to produce a microstructure co…
Bench-scale and full-scale investigations of waste stabilization and volume reduction were conducted using spiked soil and ash wastes containing heavy metals such as Cd, Cr, Pb, Ni, and Hg. The waste streams were stabilized and solidified using chemically bonded phosphate ceramic (CBPC) binder, and then compacted by e…
Abstract The morphology and fracture behavior of isotactic polypropylene toughened by styrene‐ethylene‐propylene (PP/SEP) were investigated. The SEP rubber, having an average particle size of 0.2 µm, is found to be well dispersed in the PP matrix. The fracture toughness of SEP‐modified PP is greatly improved. The toug…
The head-tail connector of bacteriophage phi29, an oligomer of gene product 10 (gp10), was crystallized into various forms. The most useful of these were an orthorhombic P22(1)2(1) form (unit-cell parameters a = 143.0, b = 157.0, c = 245.2 A), a monoclinic C2 form (a = 160.7, b = 143.6, c = 221.0 A, beta = 97.8 degree…
The crystal structures of Ca 9 R (VO 4 ) 7 ( R = Nd ( I ), Sm ( II ), or Gd ( III )) were studied by the Rietveld method. The compounds are isostructural to Ca 3 (VO 4 ) 2 and are crystallized in the trigonal system (sp. gr. R 3 c , Z = 6). The unit-cell parameters are as follows: for I , a = 10.8720(5) Å, c = 38.121(…
New silicon-containing polyesterimides have been synthesized by a solution polycondensation reaction, in a high-boiling-point solvent, of a silicon-containing diacid chloride (namely bis(p-chlorocarbonyl-phenylene)-diphenylsilane) with certain dihydroxy-compounds having preformed imide rings. All these polymers were s…
The thermal loss of TL sensitivity in LiF:Mg,Cu,P annealed at temperatures above 240 oC was investigated. A new property was found; after annealing at 320 oC for 10 min the sensitivity reaches its minimum value. The degradation in TL of LiF:Mg,Cu,P annealed at temperatures above 240 oC may be reversed partially by re-…
This work deals with the bending properties of a series of plain and rib weft knitted structures made from cashmere yarns. Additionally, some plain weft knitted fabrics made from polyester textured yarns (PET) are included for comparison. The experimental results are discussed in terms of the structural characteristic…
Abstract Novel unsymmetrical vanadyl and zinc dodecakis(2,2,2‐trifluoroethoxy)phthalocyaninates with an iodo group were synthesized by a statistical condensation route. The palladium‐catalyzed coupling reaction between such monoiodinated metallophthalocyanines and terminal acetylenic derivatives gave various new unsym…
The chemical analysis of a laser jet was performed with a combination of laser back mass transfer and X-ray photoelectron spectroscopy (XPS). It was revealed that, as compared to the source material, films deposited from the jet under laser mass transfer in air show increased oxidizability and changed chemical composi…
A procura por novos materiais que possuam propriedades magnéticas e dielétricas adequadas ao uso em absorvedores de radiação eletromagnética é de grande importância. Dentre os materiais em estudo, os polímeros condutores têm sido aplicados como centros de absorção de radiação, devido à possibilidade de variação da sua…
Using the process of zone contraction and its inverse, zone extension, the 179372 contraction types of parallelohedra in E(5) were derived from the 84 combinatorial types of relatively or totally zone-contracted parallelohedra.