Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Infrared reflection absorption spectroscopy has been used to study the chemisorption of fluorine (by exposure to XeF2) on polycrystalline Si surfaces in ultrahigh vacuum and under low-pressure steady-state conditions. Adsorption at 300 K leads to the sequential formation of mono-, di-, and trifluoride SiFx groups. Ann…
The thermal unfolding of ribonuclease T1 has been studied by high-sensitivity differential scanning calorimetry as a function of temperature, [GuHCl], and scanning rate. The destabilizing effect of GuHCl has revealed that the kinetics of the unfolding transition become extremely slow as the transition temperature decr…
The crystal structure of ribonuclease A with bound thymidylic acid tetramer is reported at 2.5-A resolution. The diffusion of the tetramer into native orthorhombic crystals of the ribonuclease allows for the formation of a structurally stable complex where the single-stranded nucleic acid enters and leaves the enzyme'…
Abstract Certain AB or AA and BB Diels‐Alder polymer precursors bearing maleimide and furan segments were synthesized, characterized, and polymerized. Particularly, the monomaleamic acid derived from 4,4'‐diaminodiphenylmethane, reacted with the monofurfurylpyromellitamic acid to yield a triamic acid which was cyclode…
The mean resistance of a one-dimensional wire is calculated with the use of Landauer formula for three types of arrangements: the random, Thue-Morse, and Fibonacci chain for which the positions of the atoms and the scattering strengths are modulated according to the prescribed rules. Comparison of the obtained numeric…
The changing fortunes of the mechanical theory of adhesion are traced from McBain and Hopkin's work in the 1920s to that of Venables in the 1970s and 1980s. Some comments are made on the factors which were associated with changes, during the period surveyed, in the accepted view of the importance of the theory.
Cooperative effects involved with the radiation and scattering of sound by gas bubbles distributed in liquids is investigated analytically. Bubble interaction through the common friction radiation field is taken into account. It is shown that mutual interaction may lead to synchronization of the bubble oscillations an…
Abstract Direct grafting of polystyrene onto polyethylene has been carried out in a twin screw extruder with an organic peroxide and a crosslinking co‐agent. The reaction extruded blends exhibited enhancement in impact properties at an optimum level of peroxide and co‐agent. Further improvement was achieved by introdu…
Rates of menstrual disorders were studied in 231 female production workers with high exposure to toluene (mean 88 (range 50-150 ppm) in a factory manufacturing audio speakers and compared with a control group of 58 female production workers in other departments in the same factory who had little or no exposure to tolu…
Polybrominated dibenzofurans (PBDFs) are formed during extrusion of high-impact polystyrene (I) contg. the flame retardant system decabromodiphenyl ether(II)/Sb2O3. The process of formation of PBDFs was examd. at an extrusion temp. of 275 °. To get a better understanding of processes taking place in the polymer melt d…
A decagonal phase with a periodicity of 3·78 nm (= 3 × 1·26nm) along the periodic axis has been found for the first time in Al–Cu–Cr alloys in the as-cast state as well as in the annealed state. The temperature range of stability has been found to be very narrow around 1000°C by investigation of differently annealed s…
The photolytic decomposition in air of a polyimide film based on a dianhydride and a diarylamine with hexafluoroisopropylidene 6F bridging groups is extremely rapid, leading to efficient chain cleavage and subsequent photooxidative decomposition. Only relatively short photolysis times with an unfiltered medium-pressur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-organic chemical vapor deposition of copper and copper(I) oxide from copper(I)tert-butoxidePatrick M. Jeffries, Lawrence H. Dubois, and Gregory S. GirolamiCite this: Chem. Mater. 1992, 4, 6, 1169–1175Publication Date (Print):November 1, 1992Publication History Publishe…
We study phase ordering in nematic liquid crystals using cell-dynamics simulations for d=2, n=2, and d=3, n=3. The tail in the structure function decays as ${\mathit{k}}^{\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\chi}}}$, with \ensuremath{\chi}=4.0\ifmmode\pm\else\textpm\fi{}0.1 for d=2 and \ensuremath{\chi}=5.3\ifm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly selective homocoupling reaction of allylic halides using barium metalAkira Yanagisawa, Hiroaki Hibino, Shigeki Habaue, Yoshiyuki Hisada, and Hisashi YamamotoCite this: J. Org. Chem. 1992, 57, 24, 6386–6387Publication Date (Print):November 1, 1992Publication History Pu…
In previous works, the authors found that substituted N-aryl-2,5-dimethylpyrroles are very effective inhibitors of iron corrosion in acid solutions. The efficiency of an inhibitor in protecting metals from corrosion is often associated with the molecular structure of the inhibitor as well as with the distribution of c…
The kinetic rate equation proposed by Mewis and Denn (1983) for their structural network model is found to predict accurately the large amplitude oscillatory shear behavior of molten low density polyethylene IUPAC X. Spectral analysis is used to compare the predictions of several kinetic rate equations. Frequency vers…
Three isoforms of human tyrosine hydroxylase were expressed in Escherichia coli and purified to homogeneity as the apoenzymes (metal-free). The apoenzymes exhibit typical tryptophan fluorescence emission spectra when excited at 250-300 nm. The emission maximum (342 nm) was not shifted by the addition of metal ions, bu…
Abstract The proton NMR assignments for a series of 12 thermo‐ and photochromic 1,3,3‐trimethylspiro(indoline‐2,2′‐benzopyrans) dyes is reported. All of the protons in the dye molecule were assigned through a combination of homonuclear decoupling experiments and correlation spectroscopy. The relative stereochemistry o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Conjugated metallabutadiyne complexes: synthesis, structure, and bondingJoseph Manna, Steven J. Geib, and Michael D. HopkinsCite this: J. Am. Chem. Soc. 1992, 114, 23, 9199–9200Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Publis…