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The elastic modulus ( E ), the critical strain energy release rate ( G c ), and the flexural strength (σ) have been determined for two partially dense alumina bodies produced from the same powder but with different initial densities. The mechanical properties were measured for specimens fabricated at four different re…
The oxidation behavior of a 2D woven C/SiC composite partly protected with a SiC seal coating and heat‐treated (stabilized) at 1600°C in inert gas has been investigated through an experimental approach based on thermogravimetric analyses and optical/electron microscopy. Results of the tests, performed under flowing ox…
We have observed a coherent oscillation of zone-folded acoustic phonons in GaAs-AlAs superlattices for the first time by means of a femtosecond time-resolved pump-probe technique. The oscillatory component in the time-resolved reflection signal corresponds to the upper branch (${B}_{2}$ symmetry) of the first-order do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward "Willowlike" Thermotropic DendrimersVirgil Percec, Peihwei Chu, and Masaya KawasumiCite this: Macromolecules 1994, 27, 16, 4441–4453Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.org…
In a search for high-magnetostrictive materials we have discovered in FeRh a large induced volume magnetostriction (\ensuremath{\approxeq}0.82%) at and above room temperature. Thermal-expansion measurements performed on the ordered CsCl crystallographic structure of FeRh in the temperature range 250--800 K reveal Inva…
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Abstract The open‐loop optimal control strategy to regulate the crystal‐size distribution of batch cooling crystallizers handles input, output, and final‐time constraints, and is applicable to crystallization with size‐dependent growth rate, growth dispersion, and fines dissolution. The objective function can be formu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFused Polycyclic Aromatics via Electrophile-Induced Cyclization Reactions: Application to the Synthesis of Graphite RibbonsMarc B. Goldfinger and Timothy M. SwagerCite this: J. Am. Chem. Soc. 1994, 116, 17, 7895–7896Publication Date (Print):August 1, 1994Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-State 13C NMR of Nephila clavipes Dragline Silk Establishes Structure and Identity of Crystalline RegionsAlexandra Simmons, Ed Ray, and Lynn W. JelinskiCite this: Macromolecules 1994, 27, 18, 5235–5237Publication Date (Print):August 1, 1994Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin Transitions and Thermal Hysteresis in the Molecular-Based Materials [Fe(Htrz)2(trz)](BF4) and [Fe(Htrz)3](BF4)2.cntdot.H2O (Htrz = 1,2,4-4H-triazole; trz = 1,2,4-triazolato)Jonas Kroeber, Jean-Paul Audiere, Renee Claude, Epiphane Codjovi, Olivier Kahn, Jaap G. Haasnoot,…
Research Article| August 01 1994 NAD+-dependent formate dehydrogenase V O Popov; V O Popov 1A. N. Bakh Institute of Biochemistry, Russian Academy of Sciences, Leninskiy pr. 33, 117071, Moscow, Russia Search for other works by this author on: This Site PubMed Google Scholar V S Lamzin V S Lamzin 1A. N. Bakh Institute o…
Abstract Dragline silk from the spider, Nephila clavipes , was characterized by thermal analysis (TGA, DSC, DMA), computational modeling, scanning electron microscopy and by quasi‐static as well as high rates of strain. Thermal stability to about 230°C was observed by TGA, two transitions by DMA, −75°C, representative…
Samples of doped with oxides such as and were prepared. Their conductivities and expansions on reduction were measured at 1000°C, and the thermal expansion coefficients in the range 50 to 1000°C were determined. The ionic and electronic conductivity were derived from curves of total conductivity vs. oxygen partial pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Activity of Poly(ethylene oxide)-block-Poly(propylene oxide)-block-Poly(ethylene oxide) CopolymersPaschalis Alexandridis, Vassiliki Athanassiou, Shinya Fukuda, and T. Alan HattonCite this: Langmuir 1994, 10, 8, 2604–2612Publication Date (Print):August 1, 1994Publicat…
We have solved, refined, and analyzed the 2.0-å resolution crystal structure of a 1:1 complex between the bacterial ribonuclease, barnase, and a Cys-->Ala(40,82) double mutant of its intracellular polypeptide inhibitor, barstar. Barstar inhibits barnase by sterically blocking the active site with a helix and adjacent…
This paper presents a review of recent work on the development of organic salts for second-order nonlinear optical applications. In particular, salts in which the cation has been designed to have a large molecular hyperpolarizability and in which variation of the counterion facilitates preparation of crystals with the…
Carbon nanotubes of uniform size may soon be available in macroscopic quantities. Here we examine the ordered condensed phase of these tubes. As the tube diameter varies, the structural properties show a clear transition between two regimes with qualitatively different behavior. Tubes 10 \AA{} and less in diameter beh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving Radical Polymerization of Acrylates by Organocobalt Porphyrin ComplexesBradford B. Wayland, George Poszmik, Shakti L. Mukerjee, and Michael FrydCite this: J. Am. Chem. Soc. 1994, 116, 17, 7943–7944Publication Date (Print):August 1, 1994Publication History Published on…
The catalytic treatment of motor vehicle exhaust gas has been a feature of all passenger cars in the USA since the 1975 model year. It has since been adopted in all the developed countries as the principal means of con-trolling the emissions from vehicles powered by Otto-cycle internal com-bustion engines. These inclu…
This article presents measurements of piezoelectric coefficients of lead zirconate titanate (PZT) thin films. The normal load method is used to measure the coefficients for PZT films with various compositions prepared by the sol-gel technique or by organometallic chemical vapor deposition (OMCVD). The as-deposited OMC…