Materials Literature
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The crystal structures of 2,6-naphthalenedicarboxylic acid (NDA) and dimethyl 2,6-naphthalenedicarboxylate (NDC) have been solved ab initio using a combination of X-ray powder diffraction and computational chemistry techniques. These two crystal structures, and that of 2,6-dimethylnaphthalene (DMN), have been refined…
High power laser shocks with a 0.6 ns pulse duration have been used to study the debonding of coatings electrolytically deposited on the opposite face of the substrate than the one shocked. Experiments have been carried out on various substrate/coating systems such as stainless steel/copper or nickel and hastelloy X/p…
IMP-specific, High Km 5'-nucleotidase (EC 3.1.3.5) is an ubiquitous enzyme, the activity of which is highly regulated by substrate, ATP, and inorganic phosphate. The cDNA encoding this enzyme has recently been cloned and found to contain a unique stretch of nine glutamic and four aspartic acid residues at the C-termin…
Solid solution of manganese in yttria‐stabilized zirconia (YSZ) may occur in the electrolyte of solid oxide fuel cells. Possible changes in valence, coordination, and site occupancy of Mn in YSZ are of interest. Also, subsequent structural modification of the cubic YSZ, as well as the possible ordering of vacancies, h…
Finite domains of a Langmuir monolayer in a phase with tilted molecules can be modeled by a simple elastic free energy of an $\mathrm{XY}$ order parameter with isotropic and anisotropic line tension terms. The domains can and often do contain nontrivial textures, which in turn influence the shape of the domains. Herei…
Reaction of A2CO3 (A = K, Rb) with Sn and Se in an H2O/CH3OH mixture at 115–130°C affords the isotypic selenidostannates(IV) A6Sn4Se11 _. xH2O (A = K, x = 8) 1 and 2 whose discrete [Sn4Se11]6– anions each contain two corner-bridged ditetrahedral [Sn2Se6]4– species. Similar reaction conditions with A = Cs afford Cs2Sn2…
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…