Materials Literature
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The kinetics of the etching of silicon in the system HF , HNO 3 , and H 2 O was studied as a function of the composition of the etchant at 25°C. A triaxial plot of the etch rate vs. composition of the etchant shows two extreme modes of behavior. In the region of high nitric acid compositions, etch rates are functions…
In the research reported here an attempt has been made to discover by experiment what physical assumptions and approximations are appropriate in the theory of cavitation microstreaming, especially for cavitation bubbles located near solid boundaries. A systematic investigation of the phenomenon has been made and its d…
The Fowler-Nordheim equation is derived in terms of total electron energy so as to obtain the total-energy distribution of field-emitted electrons. At 0\ifmmode^\circ\else\textdegree\fi{}K the new distribution width is less than $\frac{1}{3}$ of that obtained from the previous "normal-energy" theory. A surprising mirr…
1. Introduction to Materials Science and Engineering. Materials and Civilization. Materials and Engineering. Structure/Properties/Performance. Types of Materials. Summary. Key Words. Practice Problems. Test Problems. 2. Atomic Bonding and Coordination Engineering. Individual Atoms and Ions. Molecules. Macromolecules (…
Abstract not Available.
Abstract not Available.
It is important to avoid taking the Laplacian of H. Variation of the Elastic Constants of CrystallineAluminum with Temperature between 53'K and 773'K, PAUL M
It is important to avoid taking the Laplacian of H. Variation of the Elastic Constants of CrystallineAluminum with Temperature between 53'K and 773'K, PAUL M
It is important to avoid taking the Laplacian of H. Variation of the Elastic Constants of CrystallineAluminum with Temperature between 53'K and 773'K, PAUL M
Two-dimensional Fourier and difference syntheses have been used to solve and refine the structure of vanadinite, Pb 5 (VO 4 ) 3 Cl. The isostructural relation ship of vanadinite to other apatite-like minerals has been confirmed. The chlorine ion is surrounded by 6 divalent Pb ions at the corners of a regular octahedro…
Force-extension data for a large number of wool fibers of various types have been analyzed in detail by statistical methods in order to determine the effects of fiber crimp and cross-sectional area on mechanical behavior. During the initial stages of crimp removal, the extensional behavior is controlled by fiber bendi…
Abstract Die Pyrolyse von α‐ und β‐Methyl‐naphthalin liefert im Gegensatz zu derjenigen des Naphthalins keine durch primäre Kernverknüpfung entstandenen Kohlenwasserstoffe. Aus α‐Methyl‐naphthalin wurden Picen (II), 1.2;5.6‐Dibenzo‐anthracen (III), 1.2;7.8‐Dibenzo‐anthracen (IV), und 3.4‐Benzo‐tetraphen (V) gewonnen.…
Abstract Die Systeme BaOSnO 2 und BaOPbO 2 , die als Komponenten von Mischkristallen mit wertvollen dielektrischen Eigenschaften auftreten, wurden näher untersucht. Durch thermische Analyse und auf Grund von D EBYE ‐S CHERRER ‐Diagrammen wurden in den beiden Systemen je zwei Verbindungen aufgefunden und durch Reakti…
Reactions of the main phases (AXn where n=l) occurring in the 12 systems ,comprising the sulphides, selenides, and tellurides of Ti, Zr, Hf, and Th are discussed. These reactions include those with oxygen, chlorine, alkali metals, sulphur, and selenium, acids, alkalis, oxidizing agents, alcohols, hydrogen, and thermal…
The Hall coefficients and the resistivity of Fe-Co alloys have been measured at 77\ifmmode^\circ\else\textdegree\fi{}K, 169\ifmmode^\circ\else\textdegree\fi{}K, and room temperature using fields up to 3.3 webers/${\mathrm{m}}^{2}$. For up to 0.2% Co in Fe the ordinary Hall coefficient ${R}_{0}$ is positive at room tem…
An optical-model analysis of the measurements of nitrogen-nitrogen elastic scattering is made, and a quasi-classical discussion of the corresponding phase shifts is given.Received 24 July 1958DOI:https://doi.org/10.1103/PhysRev.112.1722©1958 American Physical Society
The mechanism of s tre?s-co rrosion crt;tcking of annealed AZ31B magnesium a lloy in an a queous ~aClI(2 CrO . solutIOn was lI1vestlgated . Cracking was predom ina ntly an electrochem ical pro.cess a nd was s hown to be dependent on t he rate of stra in i n t he sp ecim en f01l0wtng load lll g ] 11 tensIOn. It ] S pos…
X-ray diffraction intensity measurements and magnetic moment measurements were made on the spinel system $\mathrm{Fe}{\mathrm{Fe}}_{2\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{4}$, $0\ensuremath{\le}x\ensuremath{\le}2$, for the purpose of finding structural details in this system which were unknown. The x-ray meas…
Abstract Crystallization of nylon 66 at and above the optical melting point of the polymer has been studied. When heated at constant temperature in the ∼250–265°C. range, the polymer, originally crystallized in the form of positively birefringent spherulites, melts and subsequently crystallizes in the form of negative…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric Phthalocyanines. II1C. S. Marvel and Michael M. MartinCite this: J. Am. Chem. Soc. 1958, 80, 24, 6600–6604Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://doi.org/10.1021/ja01557a037Requ…