POTASSIUM FLUORIDE ON ALUMINA AS BASE FOR CROWN ETHER SYNTHESIS
Abstract Alumina coated with potassium fluoride was found to be an effective and practical reagent for the synthesis of some simple crown ethers.
Materials Literature
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Stabilization of poly(vinyl chloride). V. Synergism between metal soaps and polyols upon stabilization of poly(vinyl chloride)
Abstract The marked discolorations observed on aged poly(vinyl chloride) (PVC) containing synergetic metal soaps, in the early heating stage, were due to the excessive coloration of π complex of metal chloride and double bonds in the polyene chain. These excessive colorations were inhibited by masking the excessive me…
Buckling Strength Analysis of Large Power Transformer Windings Subjected to Electromagnetic Force Under Short Circuit
The inner winding of a power transformer is subjected to radial electromagnetic forces under short circuit conditions. When these forces exceed a certain limit, transformer windings buckle. This paper deals with the buckling strength analysis of transformer windings, including the evaluation of the bending stiffness o…
The effect of hydrogen reduction on the properties of ferrous materials
Ferrous artifacts may have been manufactured from wrought iron, steel or cast iron. Heating such artifacts can cause changes in their metallurgical structures. The effects of heating and cooling ferrous material in different atmospheres is studied and recommendations made concerning types of ferrous artifacts which sh…
Bacteriophage phi W-14-infected Pseudomonas acidovorans synthesizes hydroxymethyldeoxyuridine triphosphate
The infection of Pseudomonas acidovorans with bacteriophage phi W-14 leads to the gradual disappearance of dTTP from the cells and to the appearance of hydroxymethy dUTP (hmdUTP). Infected-cell contain dUMP hydroxymethylase and activities converting hmdUMP to humdUDP and hmdUTP. Hydroxymethylase appears immediately af…
Materials Science
The motion involved in the operation of an oscillating rheometer was analyzed, and revealed that the instrument measured a complex mixture of an instrument-dependent parameter, the spring constant, and two material-dependent parameters--the dynamic viscosity and the shear storage modulus. The significance of the worki…
Exchange coupling in copper dimers with purine ligands
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange coupling in copper dimers with purine ligandsD. Sonnenfroh and R. W. KreilickCite this: Inorg. Chem. 1980, 19, 5, 1259–1262Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.org/doi/10.1021/…
Electron spin resonance spectra of low-symmetry high-spin cobalt(II) complexes. 4. Tetragonal-octahedral dichlorotetrakis(pyridine)- and dichlorotetrakis(pyrazole)cobalt(II)
The ESR spectra of tetragonal-octahedral dichlorotetrakis(pyridine)- and dichlorotetrakis(pyrazole)cobalt(II) have been recorded. The former yields 811 = 3.33 and g, = 4.46, and the latter yields gl = 2.14, gz = 4.55, and g3 = 5.83. The g values of tetragonal-octahedral complexes are related to the bonding abilities o…
A simple analysis of spacecraft charging involving blocked photoelectron currents
An analytical model of the satellite photosheath is obtained in the presence of spacecraft charging. The combined potential is described by a combination of monopole and dipole contributions. This simple monopole‐dipole model predicts the saddle point behavior found in computer simulations. Applications to daylight ch…
Diffusion in highly defective solids the Haven ratio in the athermal lattice gas
The chemical potential μ and the kinetics of the nearest-neighbour-site-exclusion simple-cubic lattice gas have been investigated using the Monte Carlo method. The existence of a second-order phase transition at a reduced density of 0-43 and with μ/kT = 0.06 has been verified. It is shown that the Haven ratio, the rat…
HEAVY METAL CO‐TOLERANCE IN A COPPER‐TOLERANT POPULATION OF THE MARINE FOULING ALGA, ECTOCARPUS SILICULOSUS (DILLW.) LYNGBYE
SUMMARY The growth of individuals from a copper‐tolerant and a non‐tolerant population of Ectocarpus siliculosus (Dillw.) Lyngbye, in media containing copper (0.10 mg 1 ‐1 ), cobalt (0.10 mg 1 ‐1 ), zinc (0.25 mg 1 ‐1 ) or cadmium (1.50 mg 1 ‐1 ) was measured using a wet wt method. The copper‐tolerant population was f…
Functional monomers and polymers. LXX. On the adsorption of iodine onto chitosan
Abstract The ability of adsorbing iodine in different organic solutions by chitosan was studied by sorption isotherm measurements. The ability was found to be larger in polar solvents than in nonpolar solvents. The form of the chitosan samples, such as film, powder, and flake, had no influence on the adsorption behavi…
The Effect of Terminal Alkyl Chain Length on Mesomorphic Properties of 4-Alkoxyphenyl-4'-Alkylbenzoates
Esters in the homologous series 4-alkoxyphenyl 4'-alkylbenzoates, 1a, have been synthesized with both straight and methyl-branched R-groups from C3-C6, plus n-C9 and n-C10 and with straight chain R'O-groups = C1-C8, C10, C12, C14 and C16. The mesophase transitions and properties were studied by hot-stage microscopy; D…
The Marine Diatom Thalassiosira Oestrupii: Structure, Taxonomy and Distribution
Thalassiosira oestrupii (Ostenfeld) Hasle was studied from the southern Indian Ocean, Wed-dell Sea, and northern Atlantic Ocean. It has the longer extension of the strutted process inwards, with three small columnar supports. A single strutted process near the central areola is 2-3 areolae away from the single labiate…
Thermal Degradation of Polymers to Polymeric Carbon—An Approach to the Synthesis of New Materials
Abstract One hundred years ago, Edison succeeded in preparing carbon fibers for his incandescent lamp bulb by thermal decomposition of natural polymeric fibers. Ten years ago, progress reports about “Novel Forms of Carbon” predicted outstanding properties and promising new applications for the carbonization products o…
Photoemission studies of electron localization at very low excess energies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoemission studies of electron localization at very low excess energiesH. Neff, J. K. Sass, H. J. Lewerenz, and H. IbachCite this: J. Phys. Chem. 1980, 84, 10, 1135–1139Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 M…
Phase holograms formed by silver halide (sensitized) gelatin processing
A novel recording process for the formation of phase volume holograms at up to 1500 cycles/mm is described. The term silver halide (sensitized) gelatin or SHG denotes an all-gelatin phase material, which records the initial image information through photon absorption by the silver halide. Our process uses a reversal b…
Synthesis and physical properties of hexakis(isothiocyanato)technetate(III) and -(IV) complexes. Structure of the [Tc(NCS)6]3- ion
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and physical properties of hexakis(isothiocyanato)technetate(III) and -(IV) complexes. Structure of the [Tc(NCS)6]3- ionH. S. Trop, A. Davison, A. G. Jones, M. A. Davis, D. J. Szalda, and S. J. LippardCite this: Inorg. Chem. 1980, 19, 5, 1105–1110Publication Date (…
Maximum reflectance of multilayer dielectric mirrors in the presence of slight absorption
A new design technique for multilayer reflectors is presented It is useful when slight absorption by one or both of the coating materials limits the performance of the reflector. The basic procedure is to add layers to a given substrate or multilayer system one pair at a time. The thickness of each layer is chosen to…
The use of acetylene glow discharge for improving adhesive bonding of polymeric films
Abstract Coating of polyethylene (PE), poly(vinyl fluoride) (PVF), poly(tetrafluoroethylene) (PTFE), and poly(vinyl chloride) (PVC) films with flow discharge‐polymerized acetylene was investigated. The influence of glow discharge experimental conditions on the nature of the coated layer, the films' wettability, surfac…