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Abstract Verschiedene β‐Ketoiminato‐ und β‐Diketonato‐nickel(II)‐chelate bilden in flüssigem ortho‐Phenylendiamin makrozyklische Neutralkomplexe, die sich von konjugiert‐ungesättigten, 14gliedrigen Ringsystemen mit 16 π‐Elektronen ableiten. In ihren Eigenschaften stehen die Verbindungen den Porphin‐ und Phthalocyanink…
Abstract Recent tracer measurements of the self‐diffusion coefficient by Rothman and Peterson are analysed in conjunction with the determination of equilibrium concentrations of vacant lattice sites by Simmons and Balluffi and the isotope effect on self‐diffusion. The following values for monovacancy and divacancy pro…
INTRODUCTION The thermal stability of polyvinyl chloride (PVC) as one of the major manufacturing problems has been dealt with quite extensively for some decades. Apparently, there seems to be no remaining problem in processing PVC, because excellent stabilizers have been developed for use with it. However, there are s…
Abstract A mechanism is proposed to account for the phenomena observed in many vitreous systems of field‐induced switching between two or more conducting states. Conduction in the high resistance state is assumed to involve electron hopping between non‐identical sites. The vitreous nature of the systems precludes extr…
Abstract A series of aromatic polyimide‐ co ‐amides of high thermal stability were synthesized. Low‐temperature solution condensation involving aromatic diamines of varying basicity and bifunctional carboxylic acid chlorides containing performed imide rings was empolyed. This approach offers several advantages over th…
Abstract Passive 18/8 Cr‐Ni‐Stähle unterliegen der durch Halogenionen hervorgerufenen Lochfraßkorrosion. Die Durchführung potentiokinetischer, potentiostatischer und galvanostatischer Versuche sowie des Indikatortestes zeigte, daß die Lochfraß‐anfälligkeit von Chrom‐Nickel‐Stählen mit dem Chlorionengehalt, der Tempera…
The multiple maxima in “A,B,C”-type i.r. spectra of hydrogen-bonded systems are caused by Fermi resonance of νOH(broad band) with 2δOH and 2γOH such that the minima correspond to the overtone frequencies.
Abstract Aus Phasendiagrammen und Löslichkeitsmessungen für Wasserstoff in Metallen kann gefolgert werden, daß es in dem von der Metallmatrix aufgespannten Raume für den interstitiell gelösten Wasserstoff — analog zu freiem Wasserstoff — die Phasenumwandlung gasförmig‐flüssig gibt. Der kritische Punkt der Mischungslüc…
The high‐temperature zirconia electrolyte fuel cell is materials‐limited in both its performance and its range of potential application. The most significant materials limitations and problems occur with the cathode. Cathode materials must satisfy four general criteria: ( i ) chemical, ( ii ) electrochemical, ( iii )…
The rate of deposition of spherical polystyrene latex particles on smooth plastic films has been determined with the rotating disc technique. When the particles were negatively charged and the film positively charged, the deposition rate was closely in agreement with the Levich theory of diffusion-controlled transport…
The electron spin resonance spectra of polycrystalline samples of some sideramines (coprogen, ferrichrysin, ferricrocin, and ferrirubin), transferrin, and conalbumin are reported both at 9.3 and 36 kMc/sec and at various temperatures. These results have been interpreted in terms of a spin Hamiltonian of the form H = g…
Abstract not Available.
Research Article| January 01 1969 Problems Designed for the Use of Algal Cultures Robert W. Hoshaw Robert W. Hoshaw Search for other works by this author on: This Site PubMed Google Scholar The American Biology Teacher (1969) 31 (1): 21–26. https://doi.org/10.2307/4442351 Views Icon Views Article contents Figures & ta…
The structure of tapiolite formed by the solid state reactions of tantalum pentoxide with iron oxides is discussed. Reactions were carried out in the following systems. (1) In the FeO–Ta2O5 system, ordered tapiolite was formed on heating in vacuum at 1050°C for 10 hr. It has a trirutile structure and is isomorphous wi…
ABSTRACT The productivity of many wells has been seriously reduced in the pastbecause of scale deposition. In some fields, the produced water is saturatedwith gyp (calcium sulphate) that precipitates in the pores of the reservoirformation sand near the wellbore. Chemical treatments have successfullyrestored productivi…
I.r. and laser Raman spectra of 1 : 1 halogen and interhalogen adducts of dimethyl sulphide, selenide, and telluride, Me2YX2(Y = S, Se, or Te; X = halogen), have been recorded and interpreted in terms of a four-co-ordinate covalent structure of a trigonal bipyramidal type and a charge-transfer formulation of type Me2Y…
The Raman spectra of PCl5, SbCl5, NbCl5, TaCl5, MoCl5, NbBr5, and TaBr5 in the gas phase have been recorded. In all cases the data is consistent with the presence of five-co-ordinate trigonal bipyramidal species. The Raman spectra of gaseous PCl5, SbCl5, and MoCl5, show intersting temperature-dependent effects.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Kinetics of the Polymerization of PentafluorostyreneWilliam A. Pryor and Tzu-Lee HuangCite this: Macromolecules 1969, 2, 1, 70–77Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://pubs.acs.org/doi…
The compressive flow stresses of UO 2+x polycrystals and single crystals were measured between 900° and 16000°C. The stoichiometry was controlled by CO 2 /CO gas mixtures during the tests. The functional dependence of strength on stoichiometry was: image where C and m are constant at a constant temperature and 0.001 ≤…
The corrosion of pure magnesium in aqueous solutions of various p H has been studied. The reaction product is a porous layer consisting mainly of in the absence of inhibitors, but films formed in solutions containing are composed of substances which could not be identified. The reaction in inhibitor‐free solutions pro…