Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron probe microdetermination of carbon in ferrous alloysJ. S. Duerr and R. E. OgilvieCite this: Anal. Chem. 1972, 44, 14, 2361–2367Publication Date (Print):December 1, 1972Publication History Published online1 May 2002Published inissue 1 December 1972https://pubs.acs.or…
An assignment of the 13 C‐NMR spectrum of the enzyme cofactor flavin‐adenine dinucleotide (FAD) is given by comparing it with the 13 C chemical shifts of the constituents of FAD, i.e. adenosine 5′‐diphosphate, riboflavin 5′‐monophosphate, riboflavin, adenosine and adenine. The 13 C‐NMR spectrum of FAD shows three grou…
Energy levels of Er3+ in three compounds: Er(OH)3, 1% Er3+:Y(OH)3, and 1% Er3+:Tb(OH)3 have been determined from optical absorption experiments on single crystals at 77 and 1.3°K and from far infrared absorption experiments at 1.3°K. For each material, the four crystal field parameters which specify the crystal field…
The shape of the two phase, β-Nb + β-Zr, monotectoid loop in the niobium–zirconium phase diagram has been re-investigated by X-ray analysis for alloys with controlled content of interstitial impurities.
1. A substantial portion of the axial filament of the spicules of silicious sponges is protein. 2. The axial filament protein lacks the hydroxylated amino acids that are characteristically abundant in collagen. 3. It is feasible to follow the course of silicious deposition in spicules using C14 or H3 in protein precur…
Abstract The structure of poly‐1,3‐dioxolane, [OCH 2 O(CH 2 ) 2 ] n was studied by x‐ray diffraction and infrared spectroscopy. Three crystal modifications were found. The crystal structure of modification II was determined: four molecular chains of glide type pass through the orthorhombic unit cell; Pbca‐D 2 h 15…
Abstract Two mutually exclusive views exist concerning the relative stabilities of gibbsite and boehmite in soils. These are examined in terms of experimental and thermodynamic evidence and it is shown that all three possible divariant assemblages of two phases that can exist between gibbsite, beohmite and H 2 O, may…
Precise temperature and angular dependences of ESR line in a typical linear chain antiferromagnet Cu(C 6 H 5 COO) 2 3H 2 O were measured in a temperature region from 1.4 to 300 K over a microwave frequency range from 10 to 48 GHz. The angular dependence of line width at room temperature can be quantitatively explained…
The dislocation structure formed in high-temperature creep of aluminum has been investigated in the transmission electron microscope. The effect of applied stress and temperature on the quantitative characteristics—dislocation density in sub-grains, subgrain size and misorientation—has been discussed. The correlation…
Most corrosion processes are electrochemical in nature, and in recent years increasing emphasis has been placed on electrochemical test methods. This report describes a new technique for using potentiostatically determined polarization curves which fulfills the requirements of a rapid electrochemical corrosion test. T…
Die swell measurements for polystyrene samples of narrow molecular weight distribution and their blends have been made using a capillary viscometer. For the capillaries studied, the swelling ratios were nearly independent of L/D (length/diameter) but strongly dependent on the distribution of molecular weights. The bro…
The absorption and fluorescence spectra of Zn porphin in an n-octane single crystal at 4·2 K are reported in the region between 17 400 and 18 500 cm-1. A strong peak appears in both spectra at 17 961 cm-1 and is assigned to the origin of one component (|x, 0>) of the nearly degenerate Q-band. In absorption a second st…
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 R. M. A. Azzam and N. M. Bashara, "Generalized Ellipsometry for Surfaces with Directional Preference: Application to Diffraction Gratings*," J. Opt. So…
A modification of the torsional split Hopkinson bar is described which superimposes a high rate of shear strain on a slower “static” rate. The static rate of 5 × 10−5 sec−1 is increased to 850 sec−1 at a predetermined value of plastic strain by the detonation of small explosive charges; the rise time of the strain-rat…
In order to determine the ultimate molecular resolution attainable with a conventional electron microscope, the direct observation of hexadecachloro-Cu-phthalocyanine molecules was attempted. Since phthalocyanine derivatives are known to form crystalline films with columns of parallel stacks of planar molecules, the s…
Silkmoth follicles, arranged in a precise developmental sequence within the ovariole, yield pure and uniform populations of follicular epithelial cells highly differentiated for synthesis of the proteinaceous eggshell (chorion). These cells can be maintained and labeled efficiently in organ culture; their in vitro (an…
Abstract The intermetallic compounds RCo 5 (R = rare‐earth metal) form ferromagnetic hydrides. For some of the RCo 5 ‐H systems (R = La. Pr. Nd, Sm, Gd) room‐temperature isotherms have been measured. These isotherms show two‐phase regions. At 300 K the hexagonal α‐phase has a limited hydrogen solubility (<0.3 H/RCo…
Abstract The optical properties of synthetic crystals of orthorhombic and cubic Sb 2 O 3 , are compared with those of amorphous Sb 2 O 3 The energy gaps in the crystals were found to correspond to indirect transitions.
Interaction of an individual vapor bubble formed by a spark gap in water at room temperature with a neighboring air bubble, such as could have significance in cavitation, was investigated using high speed photography. Air bubbles were located both on and far from boundaries. An air bubble located on the solid boundary…
Abstract An equation correlating the activation energy for the glass transition with T R , a characteristic reference temperature, the fractional free volume, and the rate of change of the fractional free volume was developed. The resultant activation energies for about 30 polymers are given and favorably compare with…