Materials Literature
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The prompt and delayed emission spectra of a biphenyl host with naphthalene and pyrene both as guests mixed crystal have been studied. The fluorescence of naphthalene and pyrene and the excimer fluorescence of pyrene have been observed. The delayed emissions are observed from pyrene and naphthalene as delayed fluoresc…
Abstract Field observations of lubricant type and level control are presented with the intent of promoting laboratory routes to developing better rigid formulations. Calcium stearate is identified as a gelation promoter. PE wax is described as a very effective gelation retarder. POPE is an effective slip agent, ineffe…
Abstract Core samples of the Cenomanian glauconitic sediments from the Great Burgan oil field, Kuwait, display important mineralogical changes both under surface and subsurface conditions. Unconformities can be demarcated with confidence by studying the chemical weathering of unarmored glauconite which results in the…
We analyze the current‐voltage behavior of a photoelectrochemical cell assuming that its equivalent circuit consists of a photodiode in series with an electrochemical cell. One of the two cell electrodes is controlled by mixed mass and charge transfer. The model is restricted specifically to noninteracting photo and e…
The effect of Cl and SO2-4, anions as well as that of the ionic strength on the desorption of soil P were studied in 102 mineral soil samples by extracting them with KCI and K2SO4 solutions at ionic strengths of 0.025 and 0.1. The quantities of salt soluble and water soluble P in the soils were compared. Both sulphate…
An earlier theqretical expression for the flexural rigidity oftriaxially woven fabrics is presented and is shown to predict isotropy in bending when the triaxial fabric is . constructed from identical yarns in each set. Experimental results at different angles of orientation with respect to the fabric machine directio…
Differences were determined in smoldering temperatures, smoldering times, char lengths, and char areas produced by nonfiltered cigarettes allowed to burn on selected upholstery fabrics of varying air permeability levels. Three cotton upholstery fabrics, each representing a different construction and weight range, were…
Several examples of a new class of covalently linked porphyrin—quinone complexes have been incorporated into planar bilayer lipid membranes (BLM) and shown to exhibit light-induced charge separation as demonstrated by photoelectrospectrometry and electrical measurements. The photoelectric effects obtained on some of t…
Abstract Rubber elasticity may be operationally defined as very large deformability with essentially complete recoverability. In order for a material to exhibit this type of elasticity, three molecular conditions must be met: (1) the material must consist of polymeric chains, (2) the chains must be joined into a netwo…
Shrink-resist finishing of wool fabrics using aqueous based polymer systems is usually carried out using an energy intensive pad → dry → heat cure technique. This paper describes fabric shrink-resist finishing using the Bunte salt terminated polyether, Lankrolan SHR3 (Diamond Shamrock), by a simple pad → store (room t…
Electronic conductivity in Fe‐doped β‐alumina containing up to 40 w/o Fe has been measured using four techniques: ( i ) two‐electrode a‐c (complex impedance), ( ii ) two‐electrode d‐c, ( iii ) four‐electrode d‐c, and ( iv ) Wagner polarization using electrodes. The first three techniques gave consistent results while…
Abstract The influence of ammonium polyphosphate (APP) on the smoke emission of poly(acrylonitrile) (PAN) has been examined, and its mechanism of action as a smoke suppressant agent has been investigated. Smoke density and corresponding residual char data, as a function of temperature, were obtained in order to charac…
(1982). THE KINETICS OF THIXOTROPIC BEHAVIOUR IN CLAY/KAOLIN AQUEOUS SUSPENSIONS. Chemical Engineering Communications: Vol. 17, No. 1-6, pp. 13-22.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeactivation by carbon of nickel, nickel-ruthenium, and nickel-molybdenum methanation catalystsA. Douglas Moeller and Calvin H. BartholomewCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 3, 390–397Publication Date (Print):September 1, 1982Publication History Published o…
Abstract The viscosity data available for four anionically polymerized polystyrenes ranging in molecular weight from 1100 to 47,000 for the temperature range T g to T g + 100°C have been fitted by computer programs to both the Vogel, Fulcher, Tamman, and Hesse (VFTH) equation and to two optimum intersecting Arrhenius…
Abstract X-ray diffraction, optical and microprobe studies of a kaolinized oligoclase—orthoclase—two-mica—granite (Southern Armorican Massif) indicated that low-temperature metasomatism had produced three series of minerals. 1. Partial alteration of muscovite resulted in the formation of ferrous-magnesium-phengite. Bi…
The antisymmetric exchange term (AET) in the exchange spin hamiltonian, d. S1×S2 , can have sizeable effects on the EPR spectra of hetero-dinuclear transition metal complexes. In this paper we review briefly the symmetry aspects of the AET and give a general formulation for its matrix elements for any pair of S 1, S 2…
Abstract Die bei 4,2 K aus dem 121 Sb‐Mößbauer‐Effekt ermittelten Meßparameter der Isomerieverschiebung und der Quadrupolaufspaltung werden für Me 3 Sb(OH) 2 ( I ), Me 3 SbO ( II ) und Ph 3 SbS ( III ) mitgeteilt. Danach ergeben sich für I und II trigonal‐bipyramidale Umgebung der Sb‐Atome mit den Methylgruppen in äqu…
Optical absorption, emission, and excitation spectra, as well as lifetime values, are presented for ${\mathrm{Er}}^{3+}$ ions in RbMg${\mathrm{F}}_{3}$. Previous workers have demonstrated that ${\mathrm{Er}}^{3+}$ ions can reside in a number of different site symmetries in crystalline hosts such as Ca${\mathrm{F}}_{2}…
Time resolved emission measurements of Ln2[Pt(CN)4]3⋅yH2O single crystals (LnCP) at T = 1.9 K are reported. The time dependence of the E⊥c polarized emission of these crystals—with the exception of LuCP—deviates considerably from that of other tetracyanoplatinates (MCP, M≠Ln). The results can be explained assuming an…