Materials Literature
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The wettability of poly(methyl methacrylate) and polyethylene by water and aqueous mucin solutions have been studied by sessile drop and under-water captive air bubble contact angles, respectively. From the sessile drop and octane under-water contact angles the polymer-water interfaces have been characterized in terms…
Reprinted with permission from Medicine and Science in Sports and Exercise (American College of Sports Medicine) 17:6 646-650, 1985. The Daily Adjustable Progressive Resistive Exercise (DAPRE) technique was developed clinically in an effort to provide an objective means of increasing resistance concurrently with stren…
The trapdoor deformity has been thought to be the result of contraction of the semicircular scar of the skin surface. The hypothesis is presented that a sheet of internal scar is primarily responsible for raising the skin inside the semicircle.
We have examined growth and stability of titania overlayers which have been vapor deposited onto a Rh foil. Titania was found to grow layer by layer, with approximately 1 × 1015 TiOx. species/cm2 in the first layer. Submonolayer coverages of titania were unaffected by heating the sample to temperatures as high as 1320…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the gas-phase halogenation of a polyethylene surface as studied with x-ray photoelectron spectroscopyJames F. Elman, Louis J. Gerenser, Kim E. Goppert-Berarducci, and John M. PochanCite this: Macromolecules 1990, 23, 17, 3922–3928Publication Date (Print):August 1…
Low frequency dielectric measurements reveal two phase transitions in (CH3NH3)5Bi2Br11: at 311.5 K and 80 K. In the very vicinity of the ferroelectric phase transition at Tc = 311.5 K a nearly perfect Debye relaxation in the MHz region, with a critical slowing down of the relaxation frequency fε= ½πτε has been found.…
Abstract Polymerizations of phenyl glycidyl ether (PGE) and the diglycidyl ether of Bisphenol A (DGEBA) were initiated with tertiary amino alcohols. The reaction was followed by means of HPLC and IR spectroscopy. The main products isolated from the reaction mixture were identified by using mass spectrometry. The sol f…
The diffraction efficiency of a thin amplitude-phase holographic grating can be determined by a convolution operation of the diffracted amplitude series of both pure-amplitude and pure-phase gratings. Some examples of calculations are presented.
A radical anion salt based on thallium (see figure, where M = Tl) has been prepared. It is found to be the only such conducting compound, except the copper analogue, which shows a positive NMR knight shift indicating an electronic interaction between the central atom and the ligand. magnified image
The vibrational relaxation and dephasing of two-phonon states in the region of combinations or overtones of intramolecular vibrations in molecular crystals are discussed. The model Hamiltonian used includes (1) a harmonic part comprehensive of two-body intermolecular interactions that are responsible for the phonon di…
There are many simple models about fouling in the literature that calculate the optimum period for heat exchanger operation. Because of the assumptions and simplifications they contain, these models always yield, and often incorrectly, an optimum point. However, a more rigorous analysis indicates that the trend of fou…
The grain‐boundary resistivity of tetragonal zirconia polycrystals, which had undergone creep with different applied compressive loads and at different temperatures, has been measured with impedance spectroscopy. A stress exponent of unity was determined from strain rate versus stress data. The grain‐boundary resistiv…
Abstract Imide–aryl ether benzoxazole multiblock copolymers were investigated. A key feature of these copolymers is the preparation of bis(amino) aryl ether benzoxazole (PBO) oligomers via nucleophilic aromatic substitution. The molecular weights of the oligomers were 10,500 and 26,000 g/mol with T' g s of 210 and 227…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtended Heuckel MO studies of boranes. I. Relative stabilities of closo-BnHn and -BnHn2-William W. Porterfield, Marion E. Jones, Wendy R. Gill, and Kenneth WadeCite this: Inorg. Chem. 1990, 29, 16, 2914–2919Publication Date (Print):August 1, 1990Publication History Publishe…
A sensitive radioreceptor assay was used to determine the pharmacokinetics of glycopyrronium 6 micrograms/kg after intramuscular (deltoid muscle) administration in eight Caesarean section patients. A fast absorption rate was found with a mean maximum plasma concentration (Cmax) of 6.3 (SD 1.5) ng/ml, a mean time to Cm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron-hydroxide stretching resonance Raman bands of a water-soluble sterically hindered porphyrinRobert A. Reed, Kenton R. Rodgers, Kristine Kushmeider, Thomas G. Spiro, and Y. Oliver SuCite this: Inorg. Chem. 1990, 29, 16, 2881–2883Publication Date (Print):August 1, 1990Publ…
Nonstoichiometry is exhibited by many ceramics at very high temperatures. The high‐temperature treatment of yttria, in particular, can induce a large concentration of point defects that changes the electrical and mechanical behavior of the solid. In the present study, the electronic and geometric structures of nonstoi…
Magnetic neutron spectroscopy of ${\mathrm{SMFe}}_{11}$Ti reveals a dispersionless electronic excitation corresponding to transitions between levels of the exchange-split ground- and first-excited-state multiplets of the ${\mathrm{Sm}}^{3+}$ ion. The observed excitation energy of 175.5 meV at T=20 K may be accounted f…
Nanometer-sized materials are solids which may be considered as a dense ensemble of atomic clusters with a diameter of a few nanometers. Depending on whether the individual clusters have a crystalline or a glassy structure, nanocrystalline materials or nanometer-sized glasses are formed. Nanocrystalline materials (NCM…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonyl-ene reaction with vinylsilanes: silicon as a controlling element for regio- and stereochemistryKoichi Mikami, Teck Peng Loh, and Takeshi NakaiCite this: J. Am. Chem. Soc. 1990, 112, 18, 6737–6738Publication Date (Print):August 1, 1990Publication History Published on…