Materials Literature
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Tensile and fracture tests were conducted at 20° and 1200°C on a ceramic‐matrix composite that was composed of an alumina (Al 2 O 3 ) matrix that was bidirectionally reinforced with 37 vol% silicon carbide (SiC) Nicalon fibers. The composite presented nonlinear behavior at both temperatures; however, the strength and…
The propeptides of bacterial subtilisin BPN' and Carlsberg were synthesized to investigate their inhibitory function on the enzymes. Kinetically, pro-BPN' inhibits the proteolytic activities of subtilisin BPN' and Carlsberg separately in a slow binding mode. Pro-Carlsberg behaves as a typical rapid equilibrium competi…
The optimal layup with least weight or cost for a symmetrically laminated plate subject to a buckling load is determined using a hybrid composite construction. A hybrid construction provides further tailoring capabilities and can meet the weight, cost and strength constraints while a non-hybrid construction may fail t…
Magnetic structure is studied for several π-networks of graphite-like structures with edge and/or topological defects using the tight-binding model (the Hückel model). Zigzag-edged graphite have edge states, which form a partly flat band at the Fermi energy. Short range repulsion (the Hubbard U) is enough to induce hu…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSalt-Controlled Lamellar Spacing in Ionically End-Capped Symmetric Diblock CopolymersVolker Schädler and Ulrich WiesnerView Author Information Max-Planck-Institut für Polymerforschung, Postfach 3148, D-55021 Mainz, Germany Cite this…
Abstract Scanning force microscopy (SFM) was used to study the lamellar morphology of α and β spherulites in bulk intruded isotactic polypropylene (iPP) samples deformed under shear stress. The iPP specimens were sheared at a constant shear rate at room temperature. Just beyond yielding, at a shear strain level of 0.5…
Crystallization-temperature ( T c ) dependence of the probability of the presence of stacking faults, p, in the solution-grown β-form single crystal of syndiotactic polystyrene (s-PS) was analyzed on the basis of the growth theory of the polymer crystal. By comparing the experimentally obtained T c dependence of p wit…
The present study examines photoinduced electron transfer within self-assembled complexes between cytochrome c and either free base uroporphyrin (URO) or free base tetrakis(4-carboxyphenyl)porphyrin (4CP). In both systems, complexation of the porphyrin to the protein results in bathochromic shifts in the absorption ba…
Existing theory cannot account for the experimentally-observed thermal boundary resistance between deposited layers and substrates at room temperature. This is due to microstructural disorder in the deposited film within tens of nanometers of the interface. This work develops a model for the resulting thermal resistan…
As part of a program to create new low dimensional S=1/2 antiferromagnetic Heisenberg compounds with moderate exchange, we have prepared four new copper complexes with square magnetic lattices. The complexes L2[CuX4] have been prepared (L = 2-amino-5-methylpyridinium, X = Cl, Br; L = 2-amino-5-chloropyridinium, X = Br…
Other| October 01, 1997 Crystal structure refinement of aluminian lizardite-2H2 Maria Franca Brigatti; Maria Franca Brigatti Universita di Modena, Dipartimento di Scienze della Terra, Modena, Italy Search for other works by this author on: GSW Google Scholar Ermanno Galli; Ermanno Galli Search for other works by this…
Surface energy characteristics of a solid surface influence the extent and rate of protein adsorption. However, critical surface tension determined by contact angle measurements, cannot be used to predict the extent or rate of milk whey protein fouling onto a particular surface. Radioisotopic iodination of α-la and β-…
Abstract The synthesis of a photocrosslinkable polycation and its use in the assembly of alternating polyelectrolyte multilayers are described. Characterization by UV/VIS spectroscopy and time‐of‐flight secondary ion mass spectroscopy (ToF‐SIMS) reveals the influence of the crosslinking on the physical properties of t…
The photochemical reactions of nitrocobalt(III) tetraphenylporphyrin, (NO 2 )Co III TPP, and its six-coordinated complex with 4-(dimethylamino)pyridine, (NO 2 )Co III TPP(DMAPy), in benzene were studied by using a laser flash technique. The structures solved by X-ray analysis show that both compounds are the nitro for…
Impedance spectroscopy of cells indicates that both mass and charge‐transfer influence the electrode kinetics of the interfacial reactions. Charge‐transfer appears to dominate the electrode kinetics when the partial pressure of oxygen is sufficiently high, whereas mass transfer seems to be rate limiting at low oxygen…
Precision casting is an attractive method for the net shape production of parts, particularly interesting for expensive alloys like titanium. This paper investigates the possibilities to improve the properties of titanium castings, solely applying thermal treatments. It was shown that in the ({alpha} + {beta}) titaniu…
Reactions at a strongly segregated interface of a symmetric binary polymer blend are investigated via Monte Carlo simulations. End-functionalized homopolymers of different species interact at the interface instantaneously and irreversibly to form diblock copolymers. The simulations, in the framework of the bond fluctu…
Repetitive polypeptides of sequence [(AlaGly)3ProGluGly]16 3a, have been prepared in Escherichia coli as overexpressed recombinant proteins. Replacement of more than 90% of the naturally occurring proline (Pro) residues with 3,4-dehydroproline (Dhp) in sequence 3a was achieved by in vivo expression of the target prote…
Fourier transform Infrared (FTIR) analysis was applied to characterize the surface of atmospherically exposed metal plates. Early stages of atmospheric corrosion result in formation of corrosion films. Corrosion films are made up of layers of corrosion products initially caused from chemical reactions between the meta…
The dynamics of an 18-arm poly(isoprene) star polymer ${(M}_{n}^{\mathrm{arm}}$=7360 g/mol) is investigated by dynamic light scattering and viscometry. Above the overlap concentration ${c}^{*}$ the intensity autocorrelation functions show a two-step decay, which implies the existence of long range correlations, $\ensu…