Materials Literature
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Twelve species of the diatom genus Thalassiosira, most of them recently described, are recorded from the Thames Estuary and other estuaries and places round the British coast. Brief notes, with transmission electron micrographs, are given on the following species: T. profunda (Hendey) Hasle, T. proschkinae Makarova, T…
Abstract The kinetics of crystallization of quenched poly(ethylene terephthalate) (PET) films during the imbibition of methylene chloride (MeCl 2 ) vapor is studied by density measurements. The effects of film thickness (0.0025–0.086 cm) and temperature (0–38°C) were examined. The data suggest that MeCl 2 transport co…
n -Butanol fraction of aerial parts of Achyranthes aspera Linn. prevented pregnancy in adult female rats when administered orally at 75 mg/kg dose on days 1-5 post-coitum , but was ineffective in hamsters upto 300 mg/kg dose. In ovariectomized immature female rats, the extract exhibited potent estrogenic activity at t…
This study examined the thermal behavior of cast gypsum specimens, with and without additives, by means of simultaneous differential thermal analysis-thermogravimetry (DTA-TG) and dilatometry. Specimens were prepared from wet-calcined hemihydrates (Hydrocal and Densite). The additives studied were boric acid (H3BO3) a…
The chromiferous skarn mineral associations at Outokumpu have been described and a number of characteristic chromium-bearing minerals have been re-examined. A large number of wet chemical and microprobe analyses are presented for zincian chromite, uvarovite, chromian diopside, chromian tremolite, eskolaite and chromia…
Abstract Poly(ethylene terephthalate) (PET) was synthesized from its monomer bis‐hydroxyethyl terephthalate (BHET), in the presence of Sb 2 O 3 catalyst. A second order irreversible reaction model was developed, and the apparent rate constant was evaluated by observing the course of intrinsic viscosity change. At 278°…
Abstract The Rokle bentonite deposit is part of an accumulation of argillized volcanoclastic rocks in the Tertiary stratovolcanic complex of the Doupovské Mountains east of Karlovy Vary (Carlsbad), about 100 km westnorthwest of Prague, Czechoslovakia. The arenite basalt ash was originally composed of hyaloclasts and s…
Abstract A detailed microstructural study of heavily rolled α-brass has revealed that in addition to straight shear bands a ‘wavy’ structure is also present. The cold-rolled material is considered to exhibit laminar structures and properties that are similar in some respects to the behaviour of laminar composite mater…
A generalized electret generator using polymer film electrets is proposed. The rotor of the generator consists of a conducting disk and several fan-shaped pieces of two types of film electret, attached to the conducting disk with alternate polarity. The stator consists of a conducting disk with holes that have the sam…
The density and ultrasonic velocity of N(p-n-heptyloxybenzylidene) p-n-pentylaniline (70.5) are measured as a function of temperature from the isotropic liquid to the smectic B phase. The compound is pentamorphic, exhibiting four smectic phases, viz. smectic G, smectic B, smectic C, smectic A, and a nematic phase. The…
Microprobe analyses of sakuraiite and the associated stannite and kesterite from the lkuno mine, Japan, indicate the following chemical formulae: for sakuraiite, (Cu, Zn, Fe)3Qn,Sn)Sa with Cu>Zn>Fe or Zn>Cu>Fe and In>Sn (In:Sn up to 89:ll); for stannite, (Cu,Fe,Zn)3(Sn,In)S4 with Cu>Fe>Zn and Sn>In (In:Sn up to 40:60)…
A computer model is described that yielded results consistent with Instron stress- strain curves for both the machine and cross directions of various polyester, thermally point-bonded, nonwoven fabrics. Fiber and bond tensile properties, bond layout, fabric density, and fiber curl and orientation were entered into the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion-inhibitor orientation on steelGeorge A. Salensky, Michael G. Cobb, and Dennis S. EverhartCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 2, 133–140Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published inissue 1 June 1986h…
The pair correlation function and the velocity autocorrelation function of screened-Coulomb colloidal liquids, interacting via the Derjaguin-Landau-Verweg-Overbeek potential, are calculated using molecular dynamics. Examination of the structure reveals liquidlike behavior even at the lowest density which corresponds t…
Abstract The phenomenalogical and theoretical aspects of secondary electron emission due to ion bombardment in the keV energy range has been reviewed and a comparision of this process with secondary electron emission due to electron bombardment has been made. The similarities and differences between the contrasts in t…
Abstract A model describing the expansion of a polyurethane (PU) foam in a closed mold is developed. An energy balance is stated, together with constitutive equations for the vaporization rate of the foaming agent and the polymerization kinetics. A numerical solution is obtained for an experimentally‐characterized PU…
Abstract A free‐radical mechanism by which lead compounds are thought to inhibit thermal dehydrochlorination of polyvinyl chloride (PVC) is described. This mechanism is called “true stabilization” in order to distinguish it from simple hydrogen chloride (HCl) scavenging, which is a well‐known and sometimes important f…
Abstract The crystalline transition induced by immersion in a methanol/water mixture of tussah silk fibroin (from Antheraea pernyi ) film obtained by casting from a 1% solution was studied by x‐ray diffraction, differential scanning calorimetry, and infrared spectroscopy. The molecular conformation of the fibroin, con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular model of the cooperative amylose-iodine-triiodide complexAttilio Cesaro, Julio C. Benegas, and Daniel R. RipollCite this: J. Phys. Chem. 1986, 90, 12, 2787–2791Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published inissue 1 Ju…
In a distorted nematic texture, with boundaries at fixed potential, the electric field is nonlocal. This allows in particular the flexoelectric effect to give a volume contribution. Most calculations predicting large distortions must be revised.