Materials Literature
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A method to compute diffractive elements focusing in a set of scaled lines located in different focal planes along the optical axis is considered. A phase nonlinearity is applied to the phase function of a focusator in a line. It is proved that the selection of the nonlinearity is reduced to the problem of the phase d…
Abstract Chemical crosslink densities of gum and carbon black-filled natural rubber (NR) and styrene-butadiene rubber (SBR) were estimated by using a newly developed rheometer. The rheometer is the Rubber Process Analyzer (RPA 2000) which is designed specifically to measure dynamic properties such as shear storage mod…
<div class="htmlview paragraph">The need to assess the effect of exhaust gas emissions from heavy duty vehicles (buses and trucks) on emission inventories is urgent. Exhaust gas emissions measured during the fuel economy measurement test procedures that are used in different countries sometimes do not represent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the Luminescent *Cu(CN)2Br2- ExciplexAttila Horvath, Craig E. Wood, and Kenneth L. StevensonCite this: Inorg. Chem. 1994, 33, 23, 5351–5354Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November…
Dilute solution phase scanning microcalorimetric transition data for 27 members of the pluronic ABA block copolymer family are presented. Analysis of these data suggest a correlation between thermodynamic parameters for the observed transitions and poly(propylene oxide) content.
Perovskite type La0.95Ba0.05MO3 (M=Mn, FeorCo) oxides were prepared by a liquid precursor method and characterized by X-ray diffraction, oxygen desorption, and X-ray photoelectron spectroscopic studies. XPS analysis revealed the characteristic changes of the O1s peak (∼530 eV) resulting from the substitution of Ba in…
We report a transmission electron microscopy study of α-(Al-Mn-Fe-Si) phases, isostructural to the α-(Al-Mn-Si) approximant phase. Selected-area diffraction patterns exhibit a noticeable diffuse scattering due to short-range ordering. We show that the ordering effect is reinforced by the Mn additions. This diffuse sca…
The infrared-to-blue upconversion in ${\mathrm{Pr}}^{3+}$-doped yttrium aluminum garnet and yttrium lithium fluoride crystals has been studied at temperatures between 4.4 and 300 K for different activator concentrations. The excitation spectra and decay-time measurements indicated the sequential absorption of two phot…
Poly-beta-hydroxybutyric acid (PHB) was produced from xylose and lactose by using Pseudomonas cepacia. Approximately 50% PHB (grams of PHB total/grams of biomass total) was produced. With a laser-based fluorescent probe, beta-galactosidase activity was shown to be induced in P. cepacia cells grown on lactose but not i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterdiffusion of Polymers at Short TimesA. Karim, G. P. Felcher, and T. P. RussellCite this: Macromolecules 1994, 27, 23, 6973–6979Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of the Temperature and Oxygen Concentration on NOx Reduction In The Natural Gas Reburning ProcessRafael Bilbao, Angela Millera, and Maria U. AlzuetaCite this: Ind. Eng. Chem. Res. 1994, 33, 11, 2846–2852Publication Date (Print):November 1, 1994Publication History P…
We list features of the siliceous cell wall which may be of use in the systematics of the Thalassiosiraceae. Many, but not all, of these features have been used in taxonomy of the members of the family. We have subdivided or redefined some previously used features such as “complex alveoli” into component parts. Discus…
The paper describes a method, using time domain analysis, in which the equations of mixed electrical and magnetic systems are solved not as separate but as a single system. The advantages of this method, from the viewpoint of a power system designer, are discussed and the inrush current is calculated for typical 5 kVA…
Nanoporous R‐SnS‐ n materials e.g. (Et 4 N) 2 Sn 3 S 7 , have been sythesized and characterized. The crystal structures of two molecular tin(IV) sulfide species that are thought to be important in the formation of these materials are reported. Both contain the dimer (Sn 2 S 6 ) 4⊖ , which can be combined (see Fingure)…
Abstract Rubber reinforcement of silicas with different surface alkylation have been evaluated by studies of NH 3 -modified swelling, swelling volume fraction, stress-strain tests, and scanning electron microscopy. Effects of silica alkylation on filler dispersion has been explained on the basis of surface energy and…
phaZPfi, the gene encoding the extracellular poly(3-hydroxyoctanoic acid) depolymerase of Pseudomonas fluorescens GK13, was cloned, sequenced, and characterized. It comprises 837 bp and is transcribed as a monocistronic message of about 950 bp from a putative sigma 70-like promoter 32 bp upstream of the ATG start codo…
The interaction of poly(3‐hexylthiophene), P3HT, with oxygen has been investigated. Evidencein the form of UV–vis absorption, electron paramagnetic resonance data, and a field effect conductivity analysis of a polymer‐based field effect transistor–is presented for the existence of a reversible charge transfer complex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of Roading AsphaltsPhilip R. Herrington, John E. Patrick, and George F. A. BallCite this: Ind. Eng. Chem. Res. 1994, 33, 11, 2801–2809Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://doi…
Coherent arrays of refractive micro-optics are fabricated in the surface of silicon using a combination of lithographic and reactive-ion etching (RIE) techniques. The aspheric profile can be approximated in a stepwise manner by iterative steps of photolithography and RIE (binary optics technology), by direct etching o…
The recent serial section electron microscopic studies by Adamson and Michel (1993) on microves gels of frog mesentery have revealed that the large pores in the junction strand of the interendothelial cleft are widely separated 150 nm wide orifice-like breaks whose gap height 20 nm is the same as the wide part of the…