A preliminary model for growth of Ceratophyllum demersum L.
(1981). A preliminary model for growth of Ceratophyllum demersum L. SIL Proceedings, 1922-2010: Vol. 21, No. 3, pp. 1484-1491.
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Adiabatic polymerization of ε‐caprolactam in presence of lithium chloride, 2. Properties of the resultant polymer
Abstract Physical and mechanical properties of poly(ε‐caprolactam) synthesized in presence of various amounts of lithium chloride are measured on compression moulded films and correlated to the molecular organization, both in the amorphous and in the crystalline regions. By increasing the amount of LiCl present in the…
Über Thiomercurate. 2. Zur Kenntnis von Ba2HgS3
Abstract Ba 2 HgS 3 (leuchtend rot) kristallisiert nach Einkristalldaten und Guinier‐Simon‐Daten orthorhombisch mit a = 8,93 1 , b = 4,35 7 , c = 17,25 7 Å, Z = 4, Raumgruppe Pnma—D . Parameter siehe Text. Nach der Strukturaufklärung (Diffraktometerdaten, 976 hkl, MoKα, R = 6,4 5 %, R W = 8.9 6 %) liegen eckenverknüpf…
Self‐Trapped Exciton Luminescence after Tunnelling of Vk and Nao Centers in CsI:Na Crystals
Abstract Tunnelling recombination luminescence in CsI :Na crystals is studied by means of linear polarization, magnetic circular polarization, and optical detection of ESR either under or after X‐ray irradiation. Results are well interpreted in terms of a self‐trapped exciton (STE) scheme as the final emitting state o…
Analysis of residual stresses in girth welded type 304 stainless steel pipes
Tensile residual stresses induced by welding are an important factor in intergranular stress corrosion cracking (IGSCC) of Type 304 stainless steel pipes. Modified welding procedures can be used to prevent IGSCC by producing compressive residual stresses at potential crack initiation sites. This paper analyzes two pro…
An Annotated Check-List of Planktonic Diatoms from the Gulf of Naples
Abstract. New data on the planktonic diatoms from the Gulf of Naples are presented together with those from the literature. Information is given on abundances, seasonal cycles and distributions of 183 taxa, including species, varieties and forms.
Crystal, Molecular and Electronic Structure of the Electron Acceptor 2,5-difluoro-7,7,8,8-Tetracyano-p-quinodimethane, 2,5-TCNQF2
The crystal structure of the electron acceptor 2,5-difluoro-7,7,8,8-tetracyano-p-quinodimethane, 2,5-TCNQF2, has been determined by single-crystal X-ray diffraction methods. The layered crystal structure is dominated by the antiparallel coupling of cyano bond moments of symmetry-related molecules. The molecular and el…
The Crystal and Molecular Structure of N-(4-n octyloxybenzylidene)-4'-butylaniline (80.4) and the Crystal-Smectic G Transition
The crystal and molecular structure of N-(4-n octyloxybenzylidene)-4'-butylaniline (80.4), C25H35NO, has been determined at room temperature partially by direct methods and completed by subsequent Fourier synthesis. The crystals belong to the triclinic system with space group P1, a=5.452(3), b=7.948(4), c=27.356(4) Å,…
Crystal Structure and Madelung Energy for the Charge-Transfer Complex Tetrathiafulvalene-2,5-Difluoro-7,7,8,8-Tetracyano-p-Quinodimethane, TTF-2,5-TCNQF2. Observations on a Dimerized Segregated Stack Motif.
The twinned crystal structure of the charge-transfer complex TTF-2,5-TCNQF2 has been determined by single-crystal X-ray diffraction techniques. From intensity measurement on one twin component, a full structural model has been developed. The model encompasses segregated stacks of TTF donors and 2,5-TCNQF2 acceptors, w…
Conformational polymorphism of Ni(NCS)2[P(CH2CH2CN)3]2. Crystallographic study of three polymorphs
Three conformational polymorphs of Ni(NCS)2(P(CH2CH2CN)3)2 have been synthesized and their crystal structures determined by single-crystal X-ray diffraction techniques. All three crystallize in space group P21/c: cell constants for polymorph 1, a = 13.44(2) A, b = 9.04(1) A, c = 24.45(2) A, and beta = 115.4(1) degrees…
Processing, morphology, and properties of PVC
This article describes the effect of the extrusion conditions on PVC processing, morphology, and physical properties. In agreement with several previous reports, the PVC particulate hierarchy is successively broken down during processing. In particular, the 100—150-μm PVC grains are broken down to 10-μm agglomerates a…
Na6Si2Te6 - ein neues Tellurohypodisilikat / Na6Si2Te6 - A New Tellurohypodisilicate
Abstract The new compound Na 6 Si 2 Te 6 crystallizes in the monoclinic system (space group P 2 1 /c) with a = 878.6(3) pm, b = 1278.0(4) pm, c = 886.4(3) pm, β = 119.71(5)°. The compound is isotypic to K 6 Sn 2 Te 6 , essential structure elements are [Si 2 Te 6 ] 6- anions.
Hopping and delocalized electrons in class II mixed-valence oxovanadates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHopping and delocalized electrons in class II mixed-valence oxovanadatesSubhash P. Harmalker and Michael T. PopeCite this: J. Am. Chem. Soc. 1981, 103, 24, 7381–7383Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inissue 1 Dec…
Measurements of environmental radiation exposure dose rates at selected sites in Brazil.
Two types of portable instruments were developed by the former Health and Safety Laboratory of the U.S. Atomic Energy Commission to characterize external gamma radiation fields and to estimate individual exposure dose rates from major natural or fission radionuclides distributed in the soil: a pressurized ionization c…
Polymer functional group mobility. 2—Partition of ion pairs between hydrophobic and hydrophilic phases of plasma oxidized polyethylene
Abstract Plasma modification of polyethylene is modeled most simply as a process generating a two phase polymer system: a thin hydrophilic surface phase and a relatively unperturbed hydrophobic bulk phase. The oxidized surface of polyethylene exposed to a N (PEN) or to an Ar (PEAr) glow discharge plasma contains fun…
Crystal data for anhydrous theophylline
The powder data for anhydrous theophylline (1,3-dimethylxanthine), C 7 H 8 N 4 O 2 , are reported. It is orthorhombic, Pna 2 1 , with a = 24.628 (4), b = 3.833 (2), c = 8.501 (5) Å; U = 802.49 Å 3 ; Z = 4; D m = 1.478, D c = 1.489 Mg m −3 .
Monte Carlo simulation of 1–10-keV electron scattering in an aluminum target
New Monte Carlo simulations of electron scattering based on the single scattering model have been performed in the low-energy region for an aluminum target, where two basic equations are required, namely the elastic scattering cross section and the energy-loss rate. We investigated the screened Rutherford equation and…
The system Na 2 Si 2 O 5 -K 2 Si 2 O 5 -MoS 2 -H 2 O with implications for molybdenum transport in silicate melts
The behavior of molybdenite in the system Na 2 Si 2 O 5 -K 2 Si 2 O 5 -MoS 2 -H 2 O has been investigated from 340 bars to 1.36 kb in the temperature range 450 degrees to 850 degrees C. Phase relations in the system show enhanced molybdenite solubility in the alkali silicate liquids and coexisting vapors. MoS 2 solubi…
Absolute rate constants for hydrocarbon autoxidation. 31. Autoxidation of cumene in the presence of tertiary amines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsolute rate constants for hydrocarbon autoxidation. 31. Autoxidation of cumene in the presence of tertiary aminesJ. A. Howard and T. YamadaCite this: J. Am. Chem. Soc. 1981, 103, 24, 7102–7106Publication Date (Print):December 1, 1981Publication History Published online1 Ma…
CRYSTALLINE AXES OF THE SPINE AND TEST OF THE SEA URCHINSTRONGYLOCENTROTUS PURPURATUS:DETERMINATION BY CRYSTAL ETCHING AND DECORATION
By means of crystal etching and scanning electron microscopy the c- and a- axes of skeletal units of Strongylocentrotus purpuratus have been determined. Crystal etching and crystal decoration were found to be equally useful in demonstrating that the spines are single crystals of magnesian calcite. All regions of spine…