Materials Literature
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Theoretical background of the constraint effect in brittle fracture of solids is reviewed. Fracture test data from D6-aC, a high strength steel, using three-point-bend (SE(B)) specimens and surface cracked plate (SC(B)) specimens under bending are presented. It is shown that the SE(B) data has an elevated fracture tou…
In the title compound, [Cu(2)(C(10)H(12)O(4))(C(12)H(8)N(2))(2)(H(2)O)(2)](BF(4))(2)·H(2)O, the two Cu atoms are each chelated by the acetyl-acetonate unit of the 3,4-diacetyl-hexa-2,4-diene-2,5-diolate (tae) ligand. The Cu atoms are square-pyramidally penta-coordinated, with one bidentate 1,10-phenanthroline (phen) a…
Abstract Different energy levels are generally assumed to be associated with ground state (GS) and excited state (ES) gain in semiconductor quantum dot lasers and amplifiers. We present calculations based on an 8 band k ·P Hamiltonian which show that this is not the case. Two distinct absorption bands are calculated d…
Single crystals of yttrium penta-phosphate(V), YP(5)O(14), were obtained by solid-state reaction. The ortho-rhom-bic title compound belongs to the family of ultraphosphates and is the second polymorph of this composition. It is isotypic with its Ho and Er analogues. The structure contains two bridging Q(2)-type PO(4)…
Magnetization measurements have been carried out on ErCo(2−x)Tix (x=0, 0.01, 0.02, 0.03, 0.04, and 0.05) alloys in the temperature range of 4–300 K under high dc magnetic fields of up to 23 T. The substitution of Ti for Co causes no change in the crystal structure of ErCo2 (cubic Laves phase C15 with space group Fd3¯m…
In this paper, we further examine the modified free volume (MFV) theory of diffusion in an effort to improve the accuracy of self-diffusion coefficients calculated with the help of the generic van der Waals equation of state. It is shown that the self-diffusion coefficient of the Lennard-Jones (LJ) fluid can be improv…
An entirely numerical design procedure, based on computational fluid dynamics, is introduced to evaluate the performance of different polymer electrolyte fuel cell layouts and sets of operating conditions for assigned target parameters in terms of performance. The design procedure has been applied to a coflow design,…
To evaluate the material degradation of ferritic steels caused by low cycle stress-induced fatigue, the continuous examination of changes in the magnetomechanical behavior during the cyclic mechanical loading is proposed, and this is validated by comparing with the continuous examination of changes in the mechanical s…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTHigh-Frequency and -Field EPR Spectroscopy of Tris(2,4-pentanedionato)manganese(III): Investigation of Solid-State versus Solution Jahn−Teller EffectsJ. Krzystek, Gregory J. Yeagle, Ju-Hyun Park, R. David Britt, Mark W. Meisel, Louis-Claude Brunel, and Joshua Tel…
Summary CO2 corrosion inhibitors are widely adopted in production and processing facilities in the oil and gas industry. The challenge is that under multiphase flow (liquid/sand) and high shear-stress conditions, successful application of inhibitors can be difficult. Under such severe erosion-corrosion conditions, the…
The mode-specific vibrational energy relaxation (VER) of the iron-protoporphyrin IX (the heme) was studied using a non-Markovian time-dependent perturbation theory at the UB3LYP/6-31G(d) level. The derived VER time constants of the excited nu(4) and nu(7) modes, 1.2+/-0.1 and 2.1+/-0.1 ps, respectively, agree well wit…
Abstract Spatially resolved EXAFS measurements were performed using micrometer‐size x‐ray beam produced by achromatic Kirkpatrick‐Baez (KB) optical system. The KB mirrors were coated with aperiodic multilayers to increase the collection angle as compared to a total reflection mirror and to provide an energy bandpass (…
The current paper presents results from an experimental study monitoring the behaviour of reinforced concrete beams with different reinforcement dispositions (stirrups and main longitudinal reinforcement) that have undergone a galvanostatic process of accelerated corrosion. The changes in the cracking of the concrete…
Abstract Hydrolysis of 5‐cyanovaleramide (5‐CVAM) in near‐critical water without the addition of any catalyst has been demonstrated. The results demonstrated that the cyano group at one end of the carbon of 5‐CVAM is more reactive than the amide group at the other end, under the same experimental conditions. The relat…
Structural, electrical, and magnetic properties of Fe3Si/GaAs(113)A hybrid structures are studied, dependent on the layer composition varying from 15 to 26 at. % Si. The presence of superlattice reflections in x-ray diffraction and lower resistivity confirms the long-range atomic ordering in the stoichiometric Fe3Si f…
Kinetic studies on the use of Mn-assisted molybdovanadophosphate polyoxoanion (HPA-5-MnII) as catalyst for the aerobic delignification of Eucalyptus globulus kraft pulps were performed. The delignification as measured by the decrease of kappa number corrected to the lignin content in pulp followed pseudo-first-order r…
Surface cracked tension specimens of ASTM A515, Grade B steel plate were tested to failure in the ductile-to-brittle transition region. Two different specimen configurations were used: one configuration was loaded in tension except for the natural bending resulting from the presence of the surface crack, the second co…
The magnetic-induced dielectric responses of BiFeO3 (BFO) thin films were measured at the X-band microwave frequency ranged from 7 to 12.5 GHz. The measurement was given initially by a high-precision cavity microwave resonator without magnetic field. Both the real and imaginary parts of the permittivity showed its die…
Abstract: During the plastic deformation of metals, part of the mechanical energy is retained in the material as plastic deformations and the rest is converted to heat. A temperature increment is a measure of the heat energy generated in the tested specimen. This temperature can be detected by measuring the infrared (…
The ability of unspecialized stem cells to differentiate into mature, specialized cell types has made them attractive as potential agents for enhanced tissue repair and regenerative medicine. This is especially true of diseases and disorders for which no or only partially effective treatments are currently available.…