Materials Literature
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Carbon dioxide corrosion of carbon steel has been studied as a function of CO{sub 2} partial pressure (0.05 to 2.1 MPa), temperature (20, 40 60 and 90 C), pH (4 to 6) and flow velocity (0.1, 3.1, 8.5, and 13 m/s) under conditions where protective iron carbonate fare do not form. The experiments were carried out under…
Rietveld analysis is a means of revealing the detailed structure and composition of a polycrystalline sample using X-ray or neutron powder diffraction data. A starting model of the material is used to calculate an entire diffraction pattern. The model parameters (and hence the calculated pattern) are refined by the me…
Preface. Brazing fundamentals. Parameters and elements of brazing. Brazing heating methods. Braze filler metal and base material families. Fluxes, atmospheres - types and forms. Joint design, tooling/fixturing, surface preparation, inspection and safety. Applications and future of the process. Appendix. Index.
This symposium consisted of seven platform sessions: hydrogen effects; pressure tubes; fabrication; lithium effects and second phase particles; mechanical properties; oxide characterization; and in-reactor corrosion. The technical information contained in this book is valuable to zirconium alloy producers, nuclear fue…
Fluorine-doped silica active and passive optical fibers for different purposes have been fabricated by two novel modifications of the plasmachemical technology. These versions of the technology are shown to be convenient in laboratory conditions and very promising in developing various types of special fibers with non…
The magnetic relaxation of ferromagnetic powders has been studied for many years, largely due to its importance to recording technologies. However, only recently have experiments been performed that resolve the magnetic state of individual sub-micron particles. Motivated by these experimental developments, we use drop…
Engineering Mechanics of Composite Materials, 2/e analyzes the behavior and properties of composite materials-rigid, high-strength, lightweight components that can be used in infrastructure, aircraft, automobiles, biomedical products, and a myriad of other goods. This edition features additional exercises and new mate…
Abstract The transesterification reaction in the molten state of ester groups of ethylene vinyl acetate (EVA) copolymers and ethylene acrylic ester (EMA) copolymers has been used to crosslink the chains of this polymeric system. The relative EVA copolymers (or EMA copolymers) concentration dependence of the network fo…
Abstract There are few quantitative comparisons in the literature between glass transitions ( T g ) measured by differential scanning calorimetry (DSC) and by dynamic mechanical analysis (DMA). Also, in the case of DMA, two different operational definitions have been used to obtain the glass transition, namely, the lo…
Abstract An extensive series of homopolymers and copolymers has been investigated to test earlier indications of a possible link between resistance to slow crack growth and creep of macroscopic oriented samples. It was found that in the majority of cases a good correlation exists between a single creep parameter and s…
We study the average mobilities and long-time self-diffusion coefficients of a suspension of bimodally distributed spherical particles. Stokesian dynamics is used to calculate the particle trajectories for a monolayer of bimodal-sized spheres. Hydrodynamic forces only are considered and they are calculated using the i…
The determination of chlorophyll-a in algae is still subject to discussions. Literature reports that results for chlorophyll-a obtained by HPLC (high performance liquid chromatography) are too low compared with values obtained by conventional methods such as spectrophotometry or fluorometry. The reason is obvious sinc…
A method is presented for the estimation of the 'time to maximum rate under adiabatic conditions' of autocatalytic decompositions and for their safety assessment. This method is based on the kinetics: a first-order reaction in competition with a Prout-Tompkins step was choosen. Isothermal or temperature-programmed Dif…
The structural and electronic properties of clean and hydrogenated diamond (100) surfaces have been investigated via fully self-consistent ab initio calculations. We find that the clean and the monohydrogenated surfaces reconstruct via the formation of rows of symmetric dimers. Further hydrogenation to a coverage of 1…
In the bacterium Alcaligenes eutrophus, three genes encode the enzymes necessary to catalyze the synthesis of poly[(R)-(-)-3-hydroxybutyrate] (PHB) from acetyl-CoA. In order to target these enzymes into the plastids of higher plants, the genes were modified by addition of DNA fragments encoding a pea chloroplast trans…
Das am stärksten sattelförmig verbogene Porphyrin , das bislang charakterisiert wurde, ist das Dikation [H 4 obrtpp] 2 + (H 2 obrtpp = Octabromtetraphenylporphyrin). Seine Pyrrolringe sind in der Verbindung [H 4 obrtpp][CF 3 COO] 2 .5 CHCI 3 im Kristall um 62° gegeneinander gekippt, und die β‐Pyrrol‐C‐Atome sind mehr…
Abstract Structure/permeability correlations for a family of aromatic polyamide‐imides are presented. The variations in chemical structure lead to significant changes in permeability. The crystallization of PAP results in a very low permeability. The introduction of bulky group tends to increase permeability without a…
Lanthanum-modified lead zirconate titanate (PLZT) specimens with a La content of 2 at. % and a Zr/Ti ratio of 95/5 (PLZT 2/95/5) have been investigated by dielectric spectroscopy, Sawyer–Tower polarization (P-E) measurements, and hot-stage transmission electron microscopy (TEM). La ‘‘impurities’’ have been found to in…
We study the thermally induced shape fluctuations of monodisperse emulsion droplets. The very small amplitude of these fluctuations is clearly resolved by diffusing wave spectroscopy and a theory is derived to describe the measured data. We measure the dependence of the fluctuations on droplet volume fraction $\ensure…
Abstract Cationic starch, an important additive for papermaking and other uses, was prepared from native cornstarch and 3‐chloro‐2‐hydroxypropyltrimethylammonium chloride in aqueous sodium hydroxide using a twin‐screw extruder as the reactor. The effects of physical and chemical reaction variables on reaction efficien…