Materials Literature
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The 1-naphthylmethylammonium salts of not only (Z,Z)- but also (E,E)-muconic acid were found to polymerize upon photoirradiation in the crystalline state to provide a stereoregular polymer in a high yield. The stereochemical structure of both polymers obtained from the monomers with different configurations was identi…
Extracted from text ... A comparison of leather properties of skins from ten different South African sheepbreedsM.A. Snyman 1 and C.A. Jackson-Moss 21 Grootfontein ADI, P/Bag X529, Middelburg, (EC), 59002 International School of Tanning Technology, P.O. Box 2085, Grahamstown, 6140e-mail:Dier6@karoo1.agric.zaIntroducti…
Various protonated poly(o-anisidine) (PoAN)/poly(vinyl alcohol) (PVA) composites were prepared with different types of acids: sulfuric (SA), p-toluene sulfonic (TSA), camphor sulfonic (CSA), and p-dodecylbenzene sulfonic (DBSA). In the visible spectrum of each composite in dimethyl sulfoxide, three absorption peaks we…
The solution properties of poly(dimethyl siloxane) (PDMS) were studied with light scattering (LS), gel permeation chromatography/light scattering (GPC/LS), and viscometry methods. PDMS samples were fractionated, and the weight-average molecular weights, second virial coefficient, and the z-average radius of gyration o…
A hot isostatically pressed (HIP) assembly of titanium alloy encapsulated AD995 ceramic, subjected to ballistic impact, is studied in detail. The crack behavior of ceramic confined in this way is studied in a combined experimental and computational effort. Fabrication of the HIP assembly is described. An experiment in…
Ceramic materials are commonly used as ballistic protection materials. The response of a ceramic to impact, perforation and penetration is complex and only limited physical instrumentation can be used in experiments. This paper demonstrates how a hydrocode, such as AUTODYN, can be used to aid in the understanding of t…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. J. Sablik, Y. Chen, D. C. Jiles; Modified law of approach for the magnetomechanical model. AIP…
The behavior of mutually coupled cavitation bubbles can change considerably when a finite speed of sound propagation in the liquid is taken into account. This holds for the radial oscillations of the bubbles as well as for the interaction (Bjerknes) forces between them. Starting from linear analysis of the equations o…
A novel preparation route for ATZ (alumina toughened zirconia) ceramics is presented, using a commercial ATZ powder (a mixture of 20 wt.% alumina and 80 wt.% zirconia containing 3 mol.% yttria) as a solid filler and an ATZ sol or gel (of the same composition) as a liquid binder for paste extrusion at room temperature.…
A macrosegregation defect, commonly termed freckle, has limited the maximum diameter of remelted ingots of some Nbstrengthened nickel base superalloys. Two aspects of freckle formation were studied in three commercially important superalloys 718, 706 and 625: 1) the segregation characteristics which provide the drivin…
Four new chemical constituents including one naphthalene derivative, named calotropnaphthalene, two terpene derivatives, namely calotropises juiterpenol and calotropisesterterpenol and an aromatic product designated as calotropbenzofuranone along with a known compound, sucrose, have been isolated from the roots of the…
An alloy development effort was undertaken to improve the corrosion performance of zirconium-based alloys for high-burnup applications. As part of that effort, three binary alloys were studied to establish the relationship between alloy chemistry, processing, microstructure, and corrosion behavior. the binary addition…
Propagation of flexural localized vibration modes along edges of anisotropic wedges is considered in the framework of the geometrical-acoustics approach. Its application allows for straightforward evaluation of the wedge-mode velocities in the general case of arbitrary elastic anisotropy. The velocities depend on the…
Lead zirconate titanate [ Pb ( Zr 0.53 Ti 0.47 ) O 3 ] films of thickness ranging from 70 to 680 nm have been prepared by the radio‐frequency sputtering technique. The current density‐electric field ( J‐E ) characteristics of the films were investigated. Films with thicknesses above 280 nm show a varistor‐type J‐E cha…
Fourier Transform Infrared Spectroscopy Study of Thermal Annealing Behavior of ECR Pulsed Plasma Deposited Fluorocarbon Thin Films from 1,1,2,2‐Tetrafluoroethane, Labelle, Catherine B., Gleason, Karen K.
Coiled coils consist of two or more amphipathic a-helices wrapped around each other to form a superhelical structure stabilized at the interhelical interface by hydrophobic residues spaced in a repeating 3-4 sequence pattern. Dimeric coiled coils have been shown to often form in a single step reaction in which associa…
The present study was performed to analyse the structure of non-digested and digested collagen type I molecules by atomic force microscopy (AFM). Collagen type I molecules from the bovine skin were diluted with 0.05 N acetic acid, spread on a mica plate, air-dried and observed by non-contact mode AFM in air. Collagen…
Microstructural features of LASER welded duplex stainless steels have been studied from viewpoints of nitrogen distribution and its effects on pitting corrosion resistance. The experiment was conducted by means of 25 kW CO2 LASER welding process without filler metals.Nitrogen supersaturation in ferrite phase due to ra…
Three different unsaturated polyester resins were modified by toluene diisocyanate (TDI). All the resins studied were commercially available. One, 2, and 3% additions of TDI caused important changes of the resins properties. With an increase of TDI concentration gelation times increased. Suppression of the exotherm pe…
Macroporous beads, poly(ethylene glycol dimethacrylate-co-acrylic acid) [poly(EGDMA-co-AAc)], and poly(ethylene glycol dimethacrylate-co-hydroxyethyl methacrylate) [poly(EGDMA-co-HEMA)] were prepared by the suspension polymerization technique in the presence of a porogen agent. Different experimental conditions such a…