Materials Literature
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Summary Barium sulfate scale deposition in the near wellbore, perforations, or production tubing has severely affected well productivity in many North Sea Fields. This is due to the co-mingling of the sulfate-rich seawater used for reservoir sweep with formation water containing high concentrations of barium ions. Mit…
Mean standard errors in atomic displacement parameters (ADPs) resulting from protein crystal structure determinations are estimated by comparing the ADPs of protein-chain pairs of identical sequence within the same crystal or within different crystals displaying the same or different space groups. The estimated ADP st…
According to IEC 34-2 and the harmonised European standards derived from it, the additional losses in electrical machines are taken into account by an estimated 0.5% P1 in the indirect determination of efficiency. In the USA, extensive measurements are made to this effect (IEEE/NEMA), whereas in Japan the additional l…
Technical Briefs The Influence of Particulates on CaCO3 Scale Formation N. Andritsos, N. Andritsos Chemical Process Engineering Research Institute and Department of Chemical Engineering, Aristotle University of Thessaloniki, P.O. Box 1517, GR 540 06 Thessaloniki, Greece Search for other works by this author on: This S…
Crystals of recombinant importin alpha, the nuclear-import receptor, have been obtained at two different pH conditions by vapour diffusion using sodium citrate as precipitant and dithiothreitol as an additive. At pH 4-5, the crystals have the symmetry of the trigonal space group P3121 or P3221 (a = b = 78.0, c = 255.8…
The semidilute and concentrated solutions have been extensively investigated, but many questions are still unsolved. The present work, by means of photon correlation spectroscopy investigation on PMMA/acetone solutions, aims to add new information to the comprehension of the existence of a long time contribution in th…
In single bubble sonoluminescence (SBSL) in addition to the short light pulses, the bubble emits in the collapse phase a pressure wave that can be measured with a fiber optic probe hydrophone with high spatial resolution (100 \ensuremath{\mu}m) and a rise time of 5 ns. In a systematic study we have characterized the w…
Dissipative particle dynamics (DPD) originated as a tool for performing fluid dynamics simulations of complex fluids and amongst other things has been used to simulate dilute polymer solutions. The technique employed an Euler time-stepping technique up until recently, when a velocity-Verlet type algorithm was proposed…
We have measured the electric modulus M(t) of the ionic conductor 0.4 Ca(NO3)2–0.6 KNO3 (CKN) by recording the electric field relaxation E(t) under the constraints of a constant displacement D0. The vitreous material CKN is studied in its glassy state for temperatures 240 K⩽T⩽330 K and for times 7×10−3 s⩽t⩽3×105 s. In…
A direct implementation of the reduced multiplication scheme of the Rys—Gauss quadrature in the computation of the second-order geometric derivatives for MCSCF wavefunctions is presented. Characteristics unique to this implementation are simultaneous evaluation of first- and second-order two-electron integral derivati…
The microstructural development and magnetic properties of MnZn ferrites doped with various amounts of CaO and sintered in atmospheres containing various oxygen concentrations were investigated. The results indicate a strong link among the amount of CaO segregated in the grain boundary, the oxygen concentration during…
A linear low density polyethylene (LLDPE) was functionalized with diethyl maleate (DEM) using different amounts of a peroxide as initiator. The modified polymers were characterised by means of FTIR and 1H NMR spectroscopy and the percentage of grafted DEM was determined. When the initiator concentration is increased f…
Amphiboles were synthesized along the joins tremolite-fluorotremolite, richterite-fluororichterite and potassic-richterite-potassic-fluororichterite at 750 °C and 1 kbar P(H 2 O). Infrared spectra of the amphiboles were recorded in the principal OH-stretching region. Amphiboles of the tremolite-fluorotremolite series…
A study of diamond growth at pressures below 20 mTorr by using an inductively coupled radio frequency plasma is presented. Emissive and Langmuir probes, and optical emission spectroscopy were used to examine the plasma, and deposits were obtained on single crystalline silicon and diamond substrates with controlling th…
We investigated bulk laser damage in CsLiB 6 O 10 (CLBO) and its relation to crystal structure. The damage thresholds of CLBO, with the laser irradiation direction || <001> and polarization || <100>, were determined to be 29 GW/cm 2 at 1.064 µm, and 6.4 GW/cm 2 at 0.266 µm, using a single-shot Q -switched…
Biogenic calcites show various chemical contents (Sr and Mg) related to the systematic position of the organisms. It is well known that algae, octocorallia, and echinoderm tests are composed of high Mg calcites, whereas mollusc shells are composed of lower Mg calcites. DRIFT (diffuse reflectance infrared Fourier trans…
Enhancements in selectivity by a factor of 4 to 18 were observed in the near critical regions of ammonia during the Co- and Ni-catalyzed synthesis of 1,3-diaminopropanes. These results are attributed to the higher concentration of ammonia at the surface of the catalyst, which favors the amination and suppresses degred…
The relationship between the microphase morphology and stress−strain behavior of a polystyrene- block -polybutadiene- block -poly(ε-caprolactone) SBC triblock copolymer has been investigated with polystyrene as the major component. The semicrystalline PCL block does not change significantly the basic morphology, but i…
Calculations of the hole concentration and its activation energy in boron-doped diamond are presented. The detailed structure of the valence band is taken into account by using a temperature-dependent degeneracy factor. The calculations indicate that the customary disregard of the spin-orbit band leads to the overesti…
The results of 0.5-1.0 ns molecular dynamics simulations of the collagen-like peptides [(POG)4(POA)(POG)4]3 and [(POG)9]3 (POG: proline-hydroxyproline-glycine) are presented. All simulations were performed using the AMBER-94 molecular mechanical force field with a shell of TIP3P waters surrounding the peptides. The in…