Materials Literature
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We describe a phenomenological model which accounts for the mechanical response of glass to intense impulsive loading. An important aspect of this response is the dilatancy accompanying fracture. We have also conducted a number of experiments with 38.1-mm diameter precision shaped charges to establish the performance…
The effects of shock prestrain on the mechanical behavior, microstructure, and substructure of annealed tantalum have been examined. The test material was shocked to 15 GPa for 1 µs and soft-recovered such that deformation that occurred during this procedure was predominantly due to the shock loading. Mechanical chara…
α‐Alumina‐diamond composites have been developed by normal hot‐pressing procedures using a conventional pressure of 32 MPa and 1250°C. Heretofore this type of composite has required a pressure of 6 GPa (60 kbar) to prevent the transformation of diamond to graphite. The mechanical properties, density, and thermal expan…
The present state of understanding of vibrational properties of self-interstitial atoms (SIAs) in metals is reviewed. The thoery of vibrations of SIAs in metals is discussed. The vibrational behaviour of <100>-dumbbell in fee metals and <110>-dumbbell in bcc metals is treated in detail with the use of Green's function…
Abstract Wholly aromatic, thermotropic liquid crystalline (LC) terpolyesters made from 6‐hydroxy‐2‐naphthoic acid (HNA) and 4,4′‐biphenol (BP) as key components have been prepared and evaluated for utility as high performance fiber precursors. The processability and fiber properties of a specific composition (1) made…
A new thermal/irradiation stress analysis code “VIENUS” has been developed for the graphite block in the High-Temperature Engineering Test Reactor (HTTR). The VIENUS is a two- dimensional finite element visco-elastic analysis code to take account of graphite behavior under irradiation in detail. In the analysis, the e…
Abstract We have synthesized model compounds representing the repeating units of a polyamic acid prepared from pyromellitic anhydride and an aromatic amine. They were characterized with HPLC, 1 H and 13 C liquid and solid NMR and FTIR. The Kinetic study of the ring dehydration reaction of model compounds showed that t…
Abstract Dehydration-induced migration of different exchangeable cations toward the layers of nontronite has been studied by Mössbauer spectroscopy. As interlayer water is removed exchangeable cations migrate toward Fe 3+ sites in the tetrahedral sheets of the nontronite ( Iv Fe 3+ ) causing them to distort. The amoun…
Abstract The effects of allyl ethers in coating resins have been studied in relations to different systems. The details that have been investigated are: the reactions between allyl ethers‐styrene‐cobalt salt in air, the influence of cobalt salt on oxidized allyl ethers, and the interaction between allyl ethers and mal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of a nonionic block copolymer in a mixed-solvent systemArianeh A. Samii, Gunnar Karlstroem, and Bjoern LindmanCite this: J. Phys. Chem. 1991, 95, 20, 7887–7891Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published iniss…
With the techniques of small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) the interfacial region between polymers forming a two-phase structure can be investigated. Various approaches are possible including the classical Porod analysis as well as the Fourier transform, sandwich or contrast-m…
The electrochemical behavior of a Ni 51 Co 23 Cr 10 Mo 7 Fe 5.5 B 3.5 (weight percent) amorphous alloy ribbon has been investigated in alkaline solutions. When the metal is initially subjected to anodic potentials, an enriched Cr (and possibly B) surface layer is dissolved. Following this, a hydrous oxide film can be…
This paper is a description of the flocking process for roll goods and three-dimensional objects. Both mechanical and electrostatic flocking processes are explained and common flocking substrates, adhesives, and fibers arc evaluated. The paper also includes a description of how flocking fibers are manufactured includi…
The shape-memory effect is associated with a martensitic transformation in many materials. It consists in the ability of the material to recover its original shape after being deformed through or in the martensitic phase. This shape recovery occurs because the same parent phase is obtained after the retransformation.…
A calorimetric characterization of a second-order nematic (N)-smectic-${\mathit{A}}_{2}$ (Sm-${\mathit{A}}_{2}$) transition and a detailed heat-capacity study of a Sm-${\mathit{A}}_{2}$--Sm-${\mathit{C}}_{2}$ (smectic-${\mathit{C}}_{2}$) transition have been carried out on 4'-n-heptyloxy-carbonylphenyl-4'-(4''-cyanobe…
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Work has been carried out with the objective of imparting the electronic/photonic property of extended Forster energy transfer into organized structures formed by the programmed self-assembly of synthetic nucleic acid units (fluorescent oligonucleotides and polynucleotides). Forster energy transfer is a non-radiative…
The title compound was prepared from sodium polyselenide and 12-crown-4 in DMF solution in the presence of cerium(III)chloride in the form of black needles. The crystal structure determination by X-ray diffraction shows a partially disordered structure, in which the anionic units Se 8 2- · Se 7 and Se 8 2- · Se 6 are…
Hole drift mobilities have been measured in films of solid solution of trans-1,2-bis(9H-carbazol-9-yl) cyclobutane (DCZB) in various host polymers; polymer liquid crystals (PLCs) and amorphous polymers. The hole drift mobilities were found to depend on the host polymers and be higher in PLCs. The larger mobilities of…
Identification of dimensional parameters of an arbitrarily shaped grating using scatter characteristics is presented. A rigorous diffraction model is used to predict the scatter from a known grating structure, and utilizing this information we perform the inverse problem of predicting line shape from a measurement of…