Review of construction and materials – secondite
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El horno vertical (2ª. Parte) - Dimensiones y características de la cocción en el mismo (Conclusión)
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R.P.M. Recorder
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Propagation of Microwaves between a Parallel Pair of Doubly Curved Conducting Surfaces
Microwaves propagated between two doubly-curved parallel conducting surfaces, in the geometrical optics approximation, follow rays obeying Fermat's principle. The optical distance in this case is determined both by the index of refraction of the material between the surfaces and by the curvature of the surfaces. The f…
The Optical Constants of Silver, Gold, Copper, and Aluminum I The Absorption Coefficient k
A description is given of a comparison method for determining the values of the absorption coefficient k of a metal relative to previously determined values for Ag. In this method transmission interference filters are constructed which have mica as the dielectric and have reflecting layers of Ag and of the metal x bei…
Aspects of the Biogeochemistry of Magnesium 1. Calcareous Marine Organisms
A study was made of the factors controlling the distribution of magnesium in the calcareous skeletons of marine organisms. The mineralogy of the carbonate appears to be the most important influence, with large amounts of magnesium occurring in solid solution in the calcitic forms and generally lesser amounts in the ar…
Magnetic Susceptibility of Carbons and Polycrystalline Graphites. I
In this investigation, the relation of susceptibility to the $a$ dimension of crystallites was studied over the range from turbostratic carbons with diameters of 50 angstroms, to graphitic crystals with diameters of at least several thousand angstroms. Two series of carbons, one Thermax carbon black in powder form, th…
Electrical Properties of Pure Tellurium and Tellurium-Selenium Alloys
The resistivity and Hall coefficient of pure, single-crystals tellurium and of six single-crystal tellurium-selenium alloys, ranging from 2.7 percent to 13.2 percent selenium by weight, were measured over the temperature range 90\ifmmode^\circ\else\textdegree\fi{}K to 550\ifmmode^\circ\else\textdegree\fi{}K, and a few…
Standard X-Ray Diffraction Powder Patterns.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStandard X-Ray Diffraction Powder Patterns.Ludo K. FrevelCite this: J. Am. Chem. Soc. 1954, 76, 7, 2031Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://pubs.acs.org/doi/10.1021/ja01636a108https://doi.or…
The Age- Embrittlement of Silver Coins
THAT certain ancient silver articles, including coins, have in the course of time become exceedingly brittle is fairly well known. Silver coins which have been struck must have been ductile at the time of manufacture and hence have become brittle as a result of some sort of ageing process. This form of embrittlement h…
The Crystal Structure of Cs3Fe2Cl9 and of Cs3Sb2Cl9
Hideo Yamatera, Kazumi Nakatsu; The Crystal Structure of Cs3Fe2Cl9 and of Cs3Sb2Cl9, Bulletin of the Chemical Society of Japan, Volume 27, Issue 4, 1 April
20—MEASUREMENTS OF THE AIR-DRAG OF TEXTILE THREADS
The air-drag of textile threads of different materials (e.g., nylon, rayon, wool, and especially cotton) has been measured over a range of air speeds from 20—600 ft/sec and over a range of counts. The results, the conclusions drawn from them, and descriptions of the experimental techniques used, are given in this pape…
The free energy of formation of the amide bond in polyamides
Abstract The degree of polymerization of a polyamide is determined by the equilibrium between carboxyl, amino, and amide groups, and water molecules. Equations are deduced for the relationship between the equilibrium constant k 1 , the number‐average chain length n and the partial pressure of water. Allowance is made…
Optical and Electron Microscopic Studies of Cotton Fiber Structure
The appearance, growth, and structure of a cotton fiber are described, and photomicrographs and electron micrographs are used to illustrate both gross and fine features of the cell wall morphology. Heretofore, microscopy of the fiber has been limited to the use of dispersion, swelling and staining methods, in plain an…
A study by infra‐red spectroscopy of hydrogen bonding in cellulose
Abstract The interaction between cellulose and heavy water allows absorptions due to stretching of OH groups in crystalline and amorphous regions to be studied independently. Crystalline regions give several absorption bands in the 3600–3000 cm. −1 range and it is shown that all the bands are due to stretching of OH g…
Structural Investigations by Means of Nuclear Magnetism. III. Ammonium Halides
The proton magnetic resonance absorption has been measured in NH4Cl, NH4Br, and NH4I crystal powders from —195°C to room temperature, and for NH4Cl to 200°C. Line width transitions were found at —144, —171, and about —198°C in the chloride, bromide, and iodide, respectively. The N–H distance in the ammonium ion was de…
Absorption Spectra and Electrical Conductivities of UO2-ThO2 Solid Solutions1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption Spectra and Electrical Conductivities of UO2-ThO2 Solid Solutions1Dieter M. GruenCite this: J. Am. Chem. Soc. 1954, 76, 8, 2117–2120Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://pubs.acs.o…
The Decomposition of Hypobromite and Bromite Solutions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Decomposition of Hypobromite and Bromite SolutionsP. Engel, A. Oplatka, and B. Perlmutter-HaymanCite this: J. Am. Chem. Soc. 1954, 76, 7, 2010–2015Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://pu…
The Polymerization of Monosilicic Acid
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Polymerization of Monosilicic AcidG. B. AlexanderCite this: J. Am. Chem. Soc. 1954, 76, 8, 2094–2096Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://doi.org/10.1021/ja01637a017RIGHTS & PERMISSIONSAr…
Ionic Conductivity of Impure Polar Crystals
Experimental determinations of the ionic conductivity of impure or "doped" alkali halide crystals are often used to find the mobility of the cation vacancies. For this purpose it is important to know to what extent the vacancies and the impurity ions have associated together to form neutral "complexes," which do not c…