Materials Literature
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The crystallization of oxyethylene/oxybutylene (E/B) diblock copolymers has been studied by simultaneous SAXS and WAXS. The copolymers crystallized from their melts (disordered, lamellar, or hexagonal) with folded E blocks. Rapid crystallization (quench) of lamellar melts was accompanied by a change in length scale an…
The protonated form of the ligand 2,6-bis(1'-methylbenzimidazol-2'-yl)pyridine crystallizes as its perchlorate salt (HL(1))ClO(4) (1) in the orthorhombic system Pbca, with a = 13.976(3) Å, b = 14.423(3) Å, c = 19.529(4) Å, Z = 8. The proton is located on one benzimidazole N-atom, and the two N-methyl substituents lie…
The X-ray structure of the &mgr;-carboxylate-&mgr;(1,1)-azido-bridged compound {[Cu(Hpht)(N(3))].H(2)O}(n)() has been determined (Hpht = hydrogen phthalate). Crystal data: formula C(8)H(7)CuN(3)O(5), monoclinic, P2(1)/m (No. 11), a = 7.383(3) Å, b = 6.568(4) Å, c = 10.659(4) Å, beta = 93.38(3) degrees, Z = 2. The comp…
We have measured the dc magnetization at low temperatures of tetragonal crystals of ${\mathrm{Mn}}_{12}$ acetate complex [${\mathrm{Mn}}_{12}$ ${\mathrm{O}}_{12}$ (${\mathrm{CH}}_{3}$ COO${)}_{16}$ (${\mathrm{H}}_{2}$ O${)}_{4}$ ], a material composed of a large (Avogadro's) number of identical magnetic molecules, eac…
A purification procedure for single-walled nanotubes is presented in this report. A novel purification method that incorporates the hydrothermal treatment along with other treatments such as extraction of fullerenes and oxidation and dissolution of metal particles is used in this study. The effects of each treatment i…
Molecular-dynamics and total-energy calculations using a realistic three-body potential for carbon reveal the basic atomic processes by which single-shelled nanotubes can grow out of metal-carbide particles by the root growth mechanism. We find that nanometer-sized protrusions on the metal-particle surface lead to the…
Theoretical and experimental advances in determination of three-phase invariants by multiple-beam X-ray diffraction are reviewed. The fundamental physics and mathematical analyses are explained. Plane-wave dynamical theory for the interpretation of multiple-beam interference is summarized. New results of its applicati…
Experiments were performed to examine differences in bubble cavitation inception, form, and acoustic emission in fresh and salt water. The tests were conducted on an axisymmetric headform known as the ITTC body, and acoustic emission, cavitation bubble size, and cavitation event rates were measured for a variety of ca…
Abstract This investigation was performed to resolve long‐term contradicting theories regarding the mechanisms which govern the species diffusion across the liquid B 2 O 3 layer covering a single boron particle during the combustion of boron. An environmental scanning electron microscope (ElectroScan E‐3) was used to…
Abstract The characterization, pillaring ability and some catalytic properties of a saponite from the Vicálvaro deposit of Tolsa, located in Madrid have been studied. This mineral is associated with sepiolite in the same lacustrine environment. The raw saponite presents, as special characteristics, high specific surfa…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Russel Barsh; The Epistemology of Traditional Healing Systems. Human Organization 1 March 1997; 56 (1): 28–…
This Innovations Deserving Exploratory Analysis (IDEA) project focused on an evaluation of the feasibility of using composite rebar in concrete reinforcement based on studies of the properties of basalt fiber and reinforced composite. The progress report focuses on the technical characteristics of basalt-fiber composi…
Abstract Injection molded β‐crystalline phase polypropylene (PP) composites containing 5, 10, 20, 30 and 40% (by weight) of talc filler were studied by X‐ray diffraction, scanning electron microscopy, static tensile and falling drop weight impact tests. The X‐ray diffraction analysis showed that the talc filler suppre…
Suitable parameter sets for the CHARMm force field were derived using the Dinur−Hagler energy second-derivative procedure, on the basis of SCF calculations at the 6-31G* level, for the uncommon structural units in poly(phenoxyphosphazenes) [P N, P N, P X (X = aryloxy)]. It is shown that application of molecular dynami…
A Cauer circuit model of a transformer laminate is presented. It considers saturation, eddy currents and hysteresis. The simulation results agree to experiments with an Epstein frame in the 10-200 Hz range. The paper includes a description of a computationally fast hysteresis model with few adjustable parameters and a…
To clarify the principles and mechanisms of water vapour transfer by diffusion in waterproof breathable fabrics for clothing, experiments using a simple glass dish were carried out under steady state conditions with and without a temperature gradient in the climatic chamber. It was found that both vapour pressure and…
A scanning tunneling microscopy study of the topology of thin films of SnO2 has been conducted. The films were deposited using dc reactive magnetron sputtering on microscope slides heated to 150°C. No annealing treatments were needed. For films of 125 Å to 2 000 Å, the grain size was proportional to the thickness of t…
From the absorption spectrum of CaF2:Ho3+, Judd–Ofelt intensity parameters were estimated as Ω2=0.018×10-20 cm2, Ω4=0.57×10-20 cm2, and Ω6=0.587×10-20 cm2. Radiative transition probabilities and radiative lifetimes were also estimated for some of the levels. We observed red-to-green, -blue, and -violet energy upconver…
The ATP-dependent phosphofructokinase (ATP-PFK) of Streptomyces coelicolor A3(2) was purified to homogeneity (1,600-fold) and characterized (110 kDa, with a single type of subunit of 40 kDa); it is allosterically inhibited by phosphoenolpyruvate. Cloning of the pfk gene of S. coelicolor A3(2) and analysis of the deduc…
Available data on embrittlement of duplex stainless steels (DSS) under cathodic protection (CP) in seawater, including some data previously unpublished, was reviewed. Results show hydrogen enters duplex alloys at typical protection potentials (–1 VSCE), but that the risk of failure is very low. The austenite phase ten…