Materials Literature
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The vibrational level structure of the S0→S1x transition (the Qx band) and of the S0→S1y transition (the Qy band) of free-base porphine in supersonic expansions of He was interrogated by laser-induced fluorescence excitation spectroscopy. Electronic relaxation in the S1x manifold was explored by time-resolved spectros…
Abstract Silica is not an essential component in the bonding system in XNBR-jute fiber systems. Mechanical anisotropy is observable only at the higher fiber loadings (40 phr and above) in XNBR-jute fiber composites. In composites containing sufficient amounts of bonding agent and fibers for tensile-strength anisotropy…
Abstract The formation in vitro of fibrils from type I acid‐soluble calf skin collagen has been studied before and after removal of the extrahelical peptides with carboxypeptidase and with pepsin. Turbidimetric studies show that the mechanism of fibril growth in undigested collagen is similar to that in pepsin‐digeste…
Summary A method of measuring residual monomer (Bis‐GMA) is described. In addition, the percentage of residual monomer eluted into water from composite resins after setting was compared for several commercial products.
SUMMARY Destabilization of emulsion droplets is described in terms of flocculation, coalescence and adsorption processes, and then discussed with reference to various technological aspects of dairy emulsions. A semi-quantitative measurement of homogenization-induced flocculation of cream is described using measurement…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the conformation of elastic chains in poly(dimethylsiloxane) networks by small-angle neutron scatteringM. Beltzung, Claude Picot, P. Rempp, and Jean HerzCite this: Macromolecules 1982, 15, 6, 1594–1600Publication Date (Print):November 1, 1982Publication Hist…
We show by a variety of experiments that the magnetomechanical coupling k in Metglas 2605SC has larger values than in any other device material. Our Mössbauer experiments show that the anisotropy axis is quite well defined when compared with Metglas 2605CO. The small value of the anisotropy and the well defined axis l…
A new boundary scheme for atomic-level computer simulations in solid mechaisms has been developed which is based on the finite-element method and which provides several advantages over previous boundary schemes. This has been applied to the simulation of (001) plane two-dimensional cracks in ac-Fe having crack line di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and crystal and molecular structures of hexaaquaruthenium(II) p-toluenesulfonate and hexaaquaruthenium(III) p-toluenesulfonate, [Ru(H2O)6](C7H7SO3)2 and [Ru(H2O)6](C7H7SO3)3.3H2OPaul Bernhard, Hans Beat Buergi, Juerg Hauser, Hans Lehmann, and Andreas LudiCite this:…
The fracture toughness ( K Ic ) of sintered alumina was measured using notched beam (NB) and indentation/strength‐in‐bending (ISB) techniques. K Ic (NB) decreases with increasing grain size. For fine‐grained materials (<5 μ m ), NB results overestimate K Ic , and exhibit a substantial notch‐radius sensitivity. A st…
The three partial Faber Ziman structure factors as well as the Bhatia Thornton structure factors of the metallic glass Ni 81 B 19 were evaluated by neutron diffraction experiments using the isotopic substitution method. In one of the investigated specimens the isotopic composition of the components was adjusted in suc…
The layered structure dichalcogenide Ti${\mathrm{S}}_{2}$ was studied in thin-film and bulk models, with the use of the self-consistent linearized augmented-plane-wave (LAPW) scheme. Band-structure calculations were performed on the single sandwich (S-Ti-S), the double sandwich ${(\mathrm{S}\ensuremath{-}\mathrm{T}\ma…
The dielectric loss in a rigid-molecular glass (toluene–pyridine) and in poly(propylene oxide) has been measured from 50 to 2×105 Hz during the course of isothermal annealing at several temperatures. The decrease in the loss on annealing is predominantly due to a decrease in the number of molecules participating in th…
The neurotoxicity of iohexol was evaluated and compared with the neurotoxicity of sodium diatrizoate, meglumine iothalamate, and metrizamide. Direct neurotoxicity was evaluated with in vitro rat hippocampal slices, and angiographic neurotoxicity was studied in a cat's spinal cord following thoracic aortography. In the…
Fracture surfaces of a commercial partially stabilized ZrO 2 that had undergone subcritical crack growth in H 2 0 were characterized by scanning and transmission electron microscopy. At high stress intensities (≥4.6 MPa·m −1/2 ), fracture was primarily trans granular, and coherent tetragonal ZrO 2 precipitates had und…
The trapping parameters of one of the carrier traps in low-density polyethylene were evaluated by using the X-ray-induced thermally-stimulated current (TSC) technique. The values obtained were E t (trap depth): 0.90 eV, µτ (product of mobility and lifetime): 5×10 -13 m 2 /V and n to (initial density of trapped carrier…
A checklist of the freshwater algae from the Northwest Territories has been compiled to add to an algal flora of Canada. The 44 studies included report on 279 bodies of water. A large diversity of algal communities has been examined in these investigations, such as phytoplankton and periphyton in permanent and tempora…
Paracrystalline disorder, a type of lattice imperfection which results in a loss of long-range crystalline order, was assessed in a range of biological and synthetic apatites using x-ray diffraction data. Carbonate substitution in the apatite lattice increased the amount of paracrystalline disorder in synthetic precip…
Abstract A theoretical study was carried out to achieve a better understanding of the oscillatory behavior of a gas bubble growing (or collapsing) in a viscoelastic liquid, by taking into account both the hydrodynamic and diffusion effects. The Zaremba‐DeWitt model was chosen to represent the rheological properties of…
Abstract Reinforcement of silica filler in NR in the presence of a silane coupling agent (Si-69), and an additive (TEA) has been analyzed by studies on swelling of the vulcanizate, network structure, technical properties, and scanning electron micrographs. Failure properties in the presence of a coupling agent have be…