Improving the High Temperature Performance of EPDM
Influence de la composition du caoutchouc, des systemes vulcanisants, de la teneur en oxyde de zinc, du polyethylene chlorosulfone, des antioxygenes, des coagents
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Optimization by lumped control of reactors with langmuir‐hinshelwood catalyst deactivation
Abstract A method is proposed for solving the problem of temperature optimal control in tubular fixed‐bed reactors with reaction systems described by Langmuir‐Hinshelwood‐Hougen‐Watson kinetic equations. The optimization problem is formulated by N state differential equations corresponding to the N differential fixed‐…
Two‐Phonon Processes in TISe and TlInSe2
Abstract Polarization measurements of two‐phonon absorption spectra in TISe and TlInSe 2 , and of the second‐order Raman scattering spectrum in TISe are carried out in the range of overtone and combination frequencies at room temperature. The observed peaks in the absorption and scattering spectra are interpreted by t…
Radiological Health Implications of Lead-210 and Polonium-210 Accumulations in LPG Refineries
Radon-222, a naturally occurring radioactive noble gas, is often a contaminant in natural gas. During fractionation at processing plants, Radon tends to be concentrated in the Liquified Petroleum Gas (LPG) product stream. Radon-222 decays into a number of radioactive metallic daughters which can plate out on the inter…
Addition reactions of polymers containing pendant cyclic iminoethers with thiols, carboxylic, thiocarboxylic and sulfinic acids
Abstract Poly[1‐(2‐oxazoline‐2‐yl)ethylene] ( 2a ), poly[1‐(5‐methyl‐2‐oxazoline‐2‐yl)ethylene] ( 2b ), poly[1‐(4,4‐dimethyl‐2‐oxazoline‐2‐yl)ethylene] ( 2c ), poly[1‐(4,4‐dimethyl‐5,6‐dihydro‐4 H ‐1,3‐oxazine‐2‐yl)ethylene] ( 2d ), and poly[1‐(4,4,6‐trimethyl‐5,6‐dihydro‐4 H ‐1,3‐oxazine‐2‐yl)ethylene] ( 2e ) were sy…
Structural and magnetic properties of Nd2Fe14B
A description is given of detailed analyses of neutron powder diffraction data on Nd2Fe14B at several temperatures, and relationships between the crystal structure and the magnetic properties via comparison with other rare earth-transition metal systems, Nd2Fe17 in particular, are discussed. Diffraction studies have a…
Substantivity to hair and skin of 125l‐labelled collagen hydrolysates under application simulating conditions
Synopsis Substantivity of various (125)I-labelled collagen hydrolysates to virgin or bleached and dyed European hair or human callus was tested under conditions which simulated actual application of such hydrolysates in shampoos or foam baths. Factors which most strongly influence protein substantivity were identified…
Acidity and Thermochemical Stability of Molten Sodium Nitrate and Nitrite Mixtures
The influence of acidity on the thermochemical stability of molten sodium nitrate‐nitrite mixtures used as heat‐transfer fluids (as in the case of the French electrosolar power system called Thémis) has been demonstrated by considering the diagram relative to redox systems corresponding to these mixtures and been esta…
Determination of Optical Constants of Thin Films with Non-uniform Thickness from the Fringe Pattern of the Transmittance Spectra
The method for determining of optical constants of weakly absorbing plane-parallel films from the fringe pattern of the transmittance spectra is extended. The model supposes that the film thickness varies slowly but that the surface of the film is smooth, so that scattering of the beam can be neglected. A simple appro…
STRUCTURAL UNIT/GRAIN BOUNDARY DISLOCATION MODEL FOR TWIST BOUNDARIES IN CUBIC CRYSTALS
The systematics of [001] twist boundary structure is presented formally in terms of a structural unit/grain boundary dislocation hierarchical model and the earlier model of Sutton is generalized. By comparison with experimental observation and atomistic calculation using pair-potential models the physical significance…
Tb3+→Ce3+ energy transfer in Tb3+:Ce3+:YAG single crystalsa)
An energy transfer from 5D3 and 5D4 levels of Tb3+ to 2D3/2 state of Ce3+ in Ce3+:Tb3+:YAG was studied using time resolved spectroscopy. It was found that the transfer from the Tb3+(5D3) level proceeds via (d–d) interaction and the critical distance is 18 Å. The transfer from Tb3+(5D4) state was consistent with the (d…
Corrosion Behavior of 70Cu-30Ni Alloy in 0.5M NaCl and in Synthetic Seawater
Electrochemical corrosion rates of 70Cu-30Ni alloy have been measured in oxygenated 0.5M NaCl and in synthetic seawater by the Tafel extrapolation procedure using a rotating disk electrode system. The rotation rate was varied from 500 to 6000 rpm. A log-log plot of the corrosion current vs rotation rate was linear, wi…
Isothermal growth of low molecular weight polyethylene single crystals from solution. 2. Melting and dissolution behavior
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal growth of low molecular weight polyethylene single crystals from solution. 2. Melting and dissolution behaviorW. M. Leung, R. St. John Manley, and A. R. PanarasCite this: Macromolecules 1985, 18, 4, 753–759Publication Date (Print):April 1, 1985Publication History…
INTERACTION BETWEEN LATTICE AND GRAIN BOUNDARY DISLOCATIONS AND THEIR ROLE IN MECHANICAL PROPERTIES OF INTERFACES
This paper is a brief review of the relationship between the structure and the mechanical properties of grain interfaces. Early work had inferred that such a correlation exists from experiments with bicrystals of different orientations. More recently, the advances in the understanding of grain boundary structure have…
Statistics for the Number of Fiber Ends in a Segment of a Random Assembly of Aligned Fibers
A plausible model is used to derive formulas for the expected number of fibers with zero, one, or two ends in a given length segment of a random assembly of aligned fibers. These results are then combined to form the expectation of the number of ends and various related quantities. By making a stronger assumption, an…
The use of zeolites for the treatment of radioactive waste
Abstract The uptake of 137-Cs and 90-Sr on to synthetic zeolite A has been studied. The use of a combined barium exchange followed by a relatively mild heat treatment has been shown to fix the isotopes within a collapsed zeolite structure. Leaching experiments using deionized and simulated sea and pond waters were car…
Crystallization of bisphenol‐A polycarbonate induced by organic salts; physical aspects. I. Crystallization rate, melting behavior, and morphology
Abstract The presence of organic acid salts in bisphenol‐A polycarbonate (PC) completely modifies the crystallization mechanism, the melting behavior, and the morphology of the polymer. Organic salts are not ordinary nucleating agents for PC since they react with the polymer, producing metal phenoxide chain ends. On r…
Temperature dependence of the hydrodynamic radius of flexible coils in solutions. 3. Experimental evidence for the crossover between Gaussian and excluded-volume single chain statistics
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of the hydrodynamic radius of flexible coils in solutions. 3. Experimental evidence for the crossover between Gaussian and excluded-volume single chain statisticsPetar Vidakovic and Francis RondelezCite this: Macromolecules 1985, 18, 4, 700–708Publicat…
Bacteroides oulorum sp. nov., a Nonpigmented Saccharolytic Species from the Oral Cavity
Bacteroides oulorum, a new nonpigmented, saccharolytic species from oral cavities, is described. This species differs both biochemically and chemically from related taxa, such as Bacteroides oralis, Bacteroides buccalis, Bacteroides denticola, Bacteroides veroralis, and Bacteroides pentosaceus. The major fermentation…
Synthesis and Swelling Properties of Fluorine Micas with Variable Layer Charges
Abstract A series of tetrasilicic Na-micas with variable layer charges (x) between x=1 and x=0.32, NaxMg3−xLix(Si4O10)F2, was synthesized. The expansibility of the synthesized Na-micas upon swelling increased with decreasing layer charge.