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The photoisomerization of disperse red 1 (DR1) in polymethylmethacrylate thin films is demonstrated by monitoring the refractive index variations by the attenuated total reflection method. Absorption spectrum measurements give a confirmation of this phenomenon. The kinetics of photoisomerization and of thermal relaxat…
We have carried out Brillouin-scattering experiments on vitreous silica at temperatures between 50 and 300 K and pressures up to 3 GPa. Application of pressure leads to considerable changes of the acoustic absorption and the velocity of sound. In order to explain our observations, we start from the so-called ``tunneli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIpso nitration of p-tert-butylcalix[4]arenesWillem Verboom, Alex Durie, Richard J. M. Egberink, Zouhair Asfari, and David N. ReinhoudtCite this: J. Org. Chem. 1992, 57, 4, 1313–1316Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Publish…
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1. Introduction. 2. Stress and Strain in Cyclic Loading. Monotonic stress-strain curve. Stress-strain relationship in cyclic loading. Hysteresis loop. Cyclic hardening/softening curves. Cyclic stress-strain curve. 3. Cyclic Plasticity and Microstructure. Metals and simple alloys with f.c.c. structure. Metals and singl…
Electron polarimeters based on Mott scattering are extensively used in atomic and molecular, solid state, nuclear, and high-energy physics. This use stems from the increasing realization that much additional information concerning many physical processes can be obtained through spin-dependent measurements. In this rev…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible luminescence quenching of porous silicon by solventsJeffrey M. Lauerhaas, Grace M. Credo, Julie L. Heinrich, and Michael J. SailorCite this: J. Am. Chem. Soc. 1992, 114, 5, 1911–1912Publication Date (Print):February 1, 1992Publication History Published online1 May…
Abstract Two‐and one‐dimensional steady‐state isothermal mathematical models of monolith reactors for selective catalytic reduction (SCR) of NO x by NH 3 are compared for circular, square and triangular geometry, as well as for linear and Rideal kinetics. Solutions for the two‐dimensional model demonstrate that, as th…
A comprehensive tabulation of Cowan–Griffin relativistic abinitio core model potentials and valence basis sets corresponding to the Cowan–Griffin abinitio model potential method is presented. It includes those for the elements from Li (Z = 3) to La (Z = 57), the alkaline M + and alkaline earth M 2+ cations, and for th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect determination of proton positions in D-Y and H-Y zeolite samples by neutron powder diffractionMirjam Czjzek, Herve Jobic, Andrew N. Fitch, and Thomas VogtCite this: J. Phys. Chem. 1992, 96, 4, 1535–1540Publication Date (Print):February 1, 1992Publication History Publi…
Enzymes suspended in organic solvents represent a versatile system for studying the involvement of water in enzyme structure and function. Addition of less than 1% (vol/vol) water to tetrahydrofuran containing 1 M 1-propanol leads to a substantial increase in the transesterification activity of subtilisin Carlsberg (f…
Neutron diffraction has been employed to investigate the structure of trilaurin in both liquid and crystalline states. The combination of long‐wavelength (4.5 Å) neutrons and wide angular ranges of detection (∼6<2θ[ o ]<∼100) per mitted a large range of momentum transfer to be acceessed (∼0.15<Q[Å −1 ]<∼2)…
Summary Barium sulfate scale occurrence is a severe production problem in North Sea oil operations. Barium sulfate is often accompanied by strontium sulfate to form a completely mixed scale called (Ba, Sr)SO4 solid solution. This paper describes a laboratory study carried out at 70°C to examine (Ba, Sr)SO4 solid-solut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe role of triton X-100 as an adsorbate and a molecular spacer on the surface of silver colloid: a surface-enhanced Raman scattering studyPavel Matejka, Blanka Vlckova, Jiri Vohlidal, Petr Pancoska, and Vladimir BaumrukCite this: J. Phys. Chem. 1992, 96, 3, 1361–1366Publica…
The high temperature behavior of carbon-phenolic and carbon-carbon composites was investigated. Models were developed which describe the thermal and me chanical responses of such composites when rapidly heated to high temperatures. On the basis of the models, a computer code was written that provides the temperature a…
BLAF represents an original computer program to devise the Bravais lattice symmetry or possible pseudo-symmetries (with allowance for large axial and angular distortions) of an experimental unit cell. The matrix approach to symmetry formulated by Himes & Mighell [Acta Cryst. (1987). A43, 375–384] is further developed…
The dielectric constants and dielectric loss values of a series of garnets were measured at l MHz using a two-terminal method and empirically determined edge corrections. The results are five intermediate pyrope-almandine samples, k'=11.96-12.35; spessartine, k'=11.65; two andradite samples, k'=10.53-10.59; and three…
The seriousness of soil acidity and the unavailability of “conventional”; liming materials in many developing countries necessitate a search for alternatives. With this goal in mind, the liming potential of two organic manures was investigated. The investigation was conducted in the greenhouse, using a highly weathere…
Interest in biodegradable plastics made from renewable resources has increased significantly in recent years. PHBV (polyhydroxybutyrate-polyhydroxyvalerate) copolymers are good examples of this type of materials. This paper provides an overview of the manufacturing process, properties, biodegradability, and applicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface vibrational modes of silanol groups on silicaB. A. Morrow and A. J. McFarlanCite this: J. Phys. Chem. 1992, 96, 3, 1395–1400Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 February 1992https://pubs.acs.org/do…