Materials Literature
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The use of specular reflection of X-rays to study the structure of the liquid/vapour interfaces along the direction normal to the surface is described. If RF(θ) is the theoretical Fresnel reflection law for X-rays incident on an ideal flat surface at an angle θ, and R(θ) is the measured reflectivity from the true surf…
The structure of thymidylate synthase (TS) from Escherichia coli was solved from cubic crystals with a = 133 A grown under reducing conditions at pH 7.0, and refined to R = 22% at 2.1 A resolution. The structure is compared with that from Lactobacillus casei solved to R = 21% at 2.3 A resolution. The structures are co…
Inductive-write and magnetoresistive (MR)-read dual-element heads of very narrow trackwidths and narrow gaps have been designed, fabricated, and recording-tested on thin-film media of high coercivity and squareness. Results show excellent writability at modest write currents of 50 mA, large readback amplitudes with go…
Gadopentetate dimeglumine is an intravenous contrast medium used in magnetic resonance imaging. To determine its safety, the authors summarized data concerning adverse reactions, laboratory parameters, and other assessments for 1,068 adult patients who received gadopentetate dimeglumine in United States clinical trial…
A new search strategy is presented to obtain initial phases for single-crystal diffraction data by molecular replacement. It consists of carrying out 'Patterson refinements' of a large number of the highest peaks of a rotation function. The target function for Patterson refinement is proportional to the negative corre…
In order to examine the Srolovitz’s theory of attractive interaction between dislocations and dispersed particles, an Al-3.1 at% Mg-1.3 vol% Be alloy having a combined effect of dispersion- and solution-hardenings was subjected to creep tests and transmission electron microscopic observation. The creep test was conduc…
Abstract Molecular interactions such as especially hydrogen bondings are considered to play a key role in polymer compatibility. In this study binary blends produced by extrusion of a MDI based segmented polyesterurethane (TPU) together with styrene‐acrylonitrile and acrylonitrile‐butadiene‐styrene copolymers, respect…
Abstract The equilibrium swelling behavior of heterogeneous systems consisting of a consisting of a continuous network phase and a dispersed lamellar, spherical, or cylindrical phase is described using a thermodynamic model. The case of swelling of both phases but to different extents is described. The equilibrium vol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the residence lifetimes of water molecules in the inner coordination sphere of paramagnetic metalloporphyrins and their adducts with poly(α-amino acids)Kenneth E. Kellar, Suree M. Spaltro, and Natalie FosterCite this: Macromolecules 1990, 23, 2, 428–431Publi…
The key physical design parameter for flexible buried non-pressure pipe is Pipe Stiffness. The ever broadening recognition of the inherent chemical resistance of polyvinyl chloride (PVC) pipe has led to a wide range of possible new applications. The effect of environment on PVC and other plastic pipe is typically meas…
The focal conditions for diffraction grating systems that employ holographic and varied line-space gratings are shown to be formally identical. An example is given in which the recording geometry of a holographic grating is derived that provides the same imaging (to lowest order) as a ruled grating whose grooves, whil…
Engineering applications of lasers in advanced technologies have grown rapidly in the last decade. The range of these applications include microlithography, cutting of polymers, ceramics, glass and metals, the marking of surface mount devices such as ceramic capacitors and deposition of films including diamond coating…
The relationship between the magnetic domain configuration and the groove dimension on grain-oriented 3% Si-Fe sheets was examined in the vicinity of the grooves using a scanning electron microscope. The grooves were formed on the sheet surface by a chemical scratching technique in order to refine the magnetic domains…
X-Ray emission (XE) and both core and valence-band X-ray photoelectron (XP) spectra have been measured for LiF, NaF, KF, BeF2, MgF2, CaF2, SrF2 and BaF2. Both the F 1s ionisation energies and the F Kα X-ray energies decrease as the cation atomic number increases within a group of the Periodic Table. Knowledge of the F…
A staged, subscale turbine combustor based on a promising rich-quench-lean combustion approach to reduce NOx emissions was used to evaluate deposition, erosion, and corrosion (DEC) from coal-water fuels (CWF). This combustor was operated with three CWF at conditions of a recuperated turbine. Specimens were exposed in…
Abstract The attenuated total reflection (ATR) technique has been used to obtain infrared spectra of heat‐set poly(ethylene terephthalate) (PET) fibers. The trans and gauche content have been estimated from the absorbances of the trans band at 1342 cm −1 , the gauche band at 1370 cm −1 , and the internal standard band…
Abstract The composition of polymer blends and alloys and the crystallinity and crystallite size/perfection of each of the components are determined by X‐ray diffraction (XRD) methods. A profile‐fitting procedure is used to resolve the XRD scan into crystalline and amorphous peaks corresponding to each of the polymers…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of phase separation of Nafion perfluorinated ionomer and poly(vinylidene fluoride) blendsJen Chang Yang and Thein KyuCite this: Macromolecules 1990, 23, 1, 182–186Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue…
Coarse grains contained in Nd-FeCo-Ga-B hot-pressed and die-upset magnets are examined. Coarse grains contained in hot-pressed magnets are found to maintain their shapes during die upsetting and to increase deformation resistance B/sub r/, H/sub k/, and (BH)/sub max/ of die-upset magnets decrease with increase in the…
The utility of the Vicat softening point is rationalised one step further. Light is thrown on Vicat measurements and they are interpreted from a qualitative viewpoint; it is stated that the Vicat softening point is nothing but a temperature at which the modulus has reached a particular level. So the Vicat softening po…