Materials Literature
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Abstract Im Verlauf von vier Jahren gelang die Synthese des Chlorophylls a aus vier relativ einfachen Pyrrol‐Derivaten. Eine neue Porphyrin‐Synthese verläuft in fünf Stufen mit einer Gesamtausbeute von etwa 50%. Das Produkt ist nicht mit anderen Porphyrinen verunreinigt. Durch Erhitzen des oxydierten Porphyrins in Ess…
Abstract Der hohe Siedepunkt (189,0°C) und die Trouton‐Konstante (29,6) der Dipol‐Verbindung Dimethylsulfoxyd beweisen eine Molekülassoziation im flüssigen Zustand. Die Temperaturabhängigkeit verschiedener physikalischer Eigenschaften (Dichte, Brechungsindex) läßt auf einen Assoziat‐Abbau zwischen etwa 40 und 60°C sch…
Abstract The attenuation of an ultrasonic wave by direct interaction with the conduction electrons in a metal is analyzed without making any special assumptions about the shape of the Fermi surface. The problem is reduced to a calculation of the currents set up in a stationary lattice by forces on the electrons, some…
A method has been devised for the measurement of crystallinity in drawn fibres of polyethylene terephthalate fibre by an X-ray technique. Strictly monochromatic X-ray radiation is used and the X-ray camera is evacuated. This enables the photographic film, which is used to record the X-ray reflexion, to be free of whit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Polymeric Condensation Products Containing Functional Thiol Side Chains. Polyamides1C. G. OVERBERGER and HERBERT ASCHKENASYCite this: J. Org. Chem. 1960, 25, 9, 1648–1651Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Pu…
The pyrolysis of ethyl propionate has been studied in the temperature range 505–602 °C, yielding the Arrhenius equation[Formula: see text]By the copyrolysis of this compound with ethyl-d 5 acetate at 384 and 488 °C, and comparison of this temperature coefficient with that for the isotopic ethyl acetates, an activation…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text M. V. R. K. Murty, "Spherical Zone-Plate Diffraction Grating," J. Opt. Soc. Am. 50, 923-923 (1960) Export Citation BibTex Endnote (RIS) HTML Plain Text…
The velocity of the sidewise 180° domain-wall motion in single-crystal BaTiO3 has been measured over a temperature range from 25° to 100°C as a function of the applied electric field. The velocity, described by v = v∞ exp(−δ/E), where δ is the activation field, E the applied electric field, and v∞ the extrapolated wal…
Kenichi Fukui, Keiji Morokuma, Chikayoshi Nagata; A Molecular Orbital Treatment of Phosphate Bonds of Biochemical Interest. I. Simple LCAO MO Treatment, Bu
Diffusion and sputtering techniques are described for applying low resistance, highly transparent, antireflecting, electrical contacts to CdS. The diffusion process entails heating CdS for several minutes in the presence of indium vapor. The resulting crystal surface resistance has been adjusted to range as low as 12…
ABSTRACT The action of buffered potassium permanganate as a fixative for electron microscopy has been investigated. Electron contrast has been shown to be produced by the deposition of granular material in the tissue. The particles are about 50 A in diameter. Actual fixation of the tissue is performed by the dehydrati…
Abstract Detailed physical, chemical, and mineralogical studies were made on profiles representative of the McBride, Isabella, and Nester series. These are soils that were formed in calcareous sandy loam, sandy clay loam, and clay loam tills, respectively, in northern Michigan. They are bisequal profiles representativ…
The optical absorption edge of WO 3 single crystal has been measured with polarized light over the temperature range from -100°C to 900°C. From 0°C to about 700°C, the absorption edge shifts linearly toward red with increasing temperature, the temperature coefficients being -9.0×10 -4 ev/deg for the case of light pola…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIonic Polymerization. XVI. Reactions of 1-Cyclopropylethanol-Vinylcyclopropane1-3C. G. Overberger and A. E. BorchertCite this: J. Am. Chem. Soc. 1960, 82, 18, 4896–4899Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1…
In disordered magnetic materials such as the ferrites, the dominant source of resonance linewidth can be attributed to processes involving only two elementary excitations: the destruction of a magnon with the creation either of another magnon or a phonon. We here consider only the primary magnon-magnon scattering proc…
The infrared absorption spectra of LiNO3, NaNO3, KNO3, RbNO3, CsNO3, NaNO2, and KNO2 above and below the melting point have been obtained by supporting the salts in the interstices of a fine mesh platinum screen. The frequencies observed have been assigned values according to the symmetry classification. The effects o…
Abstract The changes in relative viscosity which occur when nylon 66 is irradiated with 2 m.e.v. electrons under an oxygen‐free atmosphere under various conditions have been observed. A mechanism is proposed which reconciles all of these observations, and on the basis of this postulated mechanism yields of chain break…
Experimental investigations of subsolidus phase relations in the ternary system gold-silver-tellurium are discussed in the light of their significance for interpretation of the mineralogy and conditions of formation of telluride deposits, particularly those of Kalgoorlie, Western Australia, and Vatukoula, Fiji. Calave…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Compressibilities of Certain Molten Alkali Silicates and BoratesJ. O'M. Bockris and E. KojonenCite this: J. Am. Chem. Soc. 1960, 82, 17, 4493–4497Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1 September 1960htt…
Oxygen diffusion coefficients have been determined for polycrystalline samples of NiCr 2 O 4 and α‐Fe 2 O 3 by exchange measurements with oxygen gas containing the stable isotope 18 O, using mass spectrometer analysis. Oxygen diffusion in NiCr 2 O 4 can be represented by the equation D = 0.017 exp (‐65,400/RT); oxygen…