Materials Literature
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The domain structure of ferroelectric or ferroelastic materials, arising as a result of the cubic-tetragonal transition inside an epitaxial layer, are considered. A thermodynamic theory of the size and arrangement of the domains has been developed. The dependence of the equilibrium domain structure on the epitaxial la…
The real nature of the mechanism of bipolaron conduction in conducting polymers and the discussion as to whether the charging–discharging currents in these materials are of a capacitive or a redox nature are central questions in conducting polymer research. Here, a number of methyl endcapped thiophene oligomers are st…
Unidirectional and cross‐ply Nicalon fiber‐reinforced calcium aluminosilicate (CAS) glass‐ceramic composite specimens were subjected to tension–tension cyclic fatigue and static fatigue loadings. Microcrack densities, longitudinal Young's modulus, and major Poisson's ratio were measured at regular intervals of load cy…
In this investigation, a model predicting toughness anisotropy in textured ceramics containing elongated grains and in composites reinforced with rod‐shaped particles is presented. The model predictions are based on the assumption that crack deflection is the only toughening mechanism. In the model, toughness anisotro…
We have studied the response of the sidebranches of pivalic acid dendrites, growing by directional solidification, to localized periodic thermal perturbations. The perturbations were generated by a laser beam focused near the tip of a single dendrite growing in a glass capillary, with the pulse duration, repetition ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase chemistry and thermochemistry of the hydroxysulfide anion, HOS-Richard A. J. O'Hair, Charles H. DePuy, and Veronica M. BierbaumCite this: J. Phys. Chem. 1993, 97, 30, 7955–7961Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Publis…
The results summarize the problem associated with grafting of maleic anhydride (MAH) on polypropylene (PP) in the melt phase and also describe a new method for grafting PP with MAH in the solid phase. The effectiveness of the solid phase modified maleated polypropylene (MAH-PP) as interphase modifier has been document…
Conformational energy computations have been used to demonstrate that side-chain-backbone interactions contribute substantially to the stabilization of the triple-helical structure of collagen with a natural sequence. The minimum-energy conformation has been determined for a short triple-helical segment from the N-ter…
There has been controversy recently regarding the interpretation of measurements from scratched electrodes. In this work, a discussion of the various effects of ohmic drop on bared surface measurements is presented. Experiments were conducted in which the interaction between the surrounding filmed surface and the bare…
4-Hydroxybutyryl-CoA dehydratase, the key enzyme in the metabolism of gamma-aminobutyrate in Clostridium aminobutyricum, represents approximately 15-25% of the soluble protein. The enzyme was purified to homogeneity under anaerobic conditions to a specific activity of 209 nkat mg-1. The dehydratase catalyses the rever…
Changes induced in the electronic structure of ${\mathrm{BaTiO}}_{3}$ by substitutions of R=Y, La, or Nd for Ba to form the mixed oxides ${\mathit{R}}_{\mathit{x}}$${\mathrm{Ba}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{TiO}}_{3\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ have been investigated using ul…
Abstract L‐Lactide was polymerized in toluene with various alkoxide initiators. These initiators were prepared in situ from potassium t.‐butoxide and primary or secondary alcohols such as tetradecanol, diethylene glycol butyl ether, menthol or testosteron. All these alcohols were incorporated as ester endgroups into t…
The electronic hyperpolarisabilities of a chiral 4-alkoxystilbazole and its complexes with Rh(I) and Ir(I) are reported and discussed in terms of the acceptor properties of the metal fragment.
Several experiments were performed to elucidate the origin of the second-order optical nonlinearity χ(2) induced in the corona-poled Corning 7059 glass films. The values and the time decay of the second-harmonic coefficient d33 were measured for the glass films poled on several different kinds of substrates. The value…
OBJECTIVE: MR lymphography with interstitial injection of superparamagnetic iron oxide particles was optimized in normal rabbits by investigating the pattern of signal reduction in lymph nodes as a function of dose and time after administration. The optimized examination procedure was then used in a rabbit tumor model…
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 Tohru Okuzono, Kyozi Kawasaki, Tatsuzo Nagai; Rheology of random foams. J. Rheol. 1 July 1993; 37…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-resolved measurements of singlet oxygen dimol-sensitized luminescenceAlexander A. Krasnovsky Jr. and Christopher S. FooteCite this: J. Am. Chem. Soc. 1993, 115, 14, 6013–6016Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction of a polymer with highly anisotropic conductivity and structure by Co-electroprecipitation of an imide anion radical and polycationLarry L. Miller, Chuan Jiang Zhong, and Paul KasaiCite this: J. Am. Chem. Soc. 1993, 115, 14, 5982–5990Publication Date (Print):July…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen chemisorption on titania-zirconia mixed oxide supported vanadium oxide catalystsB. Mahipal Reddy, B. Manohar, and E. Padmanabha ReddyCite this: Langmuir 1993, 9, 7, 1781–1785Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published i…
A new 1:1 mixed-stack organic charge-transfer crystal of 2,6-dimethyltetrathiafulvalene-p-chloranil (DMTTF-CA), which undergoes a temperature-induced neutral-ionic transition (TINIT), was reported. At a critical temperature of 65\ifmmode\pm\else\textpm\fi{}5 K the molecular ionicity and the stack dimerization were fou…