Materials Literature
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The results of equilibrium stress–strain and swelling experiments are reported for styrene–butadiene copolymers of varying crosslink density and varying butadiene microstructure. The orientation of polymer chains is investigated under uniaxial elongation by birefringence and infrared dichroism spectroscopies which pro…
The quantitative assessment of the displacive degree of a structural phase transition is discussed both from a microscopical and an empirical viewpoint. Using Monte Carlo results for the Φ4model as a qualitative guide, the relation between both perspectives is shown. Based on the general trends observed, an empirical…
Rüdenberg's well-known letter of 1951 contains two implications which still have not been employed so far in numerical computations: (1) Whenever all types of attraction and repulsion integrals are subject to the Rüdenberg approximations in its simplest form partially known already from Mulliken, the attractive, the C…
Pressure-shear plate impact experiments have been used to study the kinetics of martensitic phase transformations in polycrystalline NiTi—a shape-memory alloy. From symmetric impact experiments the limiting shear stress at which the transformation occurs is found to be 46 MPa. From experiments in which a thin NiTi foi…
We present our compilation of electron-impact cross sections for use in modeling the ionospheres/thermospheres of the Earth and planets. The sixteen species included are N2, O2, O, CO2, CO, NO, Ar, C, N, H, H2, He, CH4, C2H2, C2H4, and C2H6. The processes include electron-impact vibrational excitation, electronic exci…
Eliminating the Need for Scale Inhibition Treatments for Elf Exploration Angola's Girassol Field Van Khoi Vu; Van Khoi Vu Elf Exploration Angola Search for other works by this author on: This Site Google Scholar Christian Hurtevent; Christian Hurtevent Elf Exploration Production Search for other works by this author o…
RB (Rice-Bran) ceramics are new porous carbon materials made from rice bran, which is one of the main industrial wastes of Japan. The rice bran is at first mixed with phenol resin, and then, after forming, carbonized in nitrogen or vacuum atmosphere at higher than 900°C. The purpose of this study is to measure some me…
(opens in new window) Buy Article (opens in new window) Permissions and Reprints (opens in new window) All articles of this category (opens in new window) The synthesis of 2,3,5-trialkylpyrroles can be easily achieved by conjugate addition of nitroalkanes to 2-alken-1,4-dione (prepared by oxidative cleavage of 2,5-dia…
Combinations of failure mechanisms are frequently encountered in the life prediction of composite materials. A life prediction methodology is developed and applied to one such failure mechanism combination. This method uses experimental data and analytical tools to predict the long-term behavior of a composite under s…
Toughening mechanisms in polycrystalline ceramics were discussed based on Griffith's energy equilibrium. These mechanisms were classified into three groups: (1) The frontal process-zone toughening mechanism, which is related to the intrinsic fracture energy of a material, and creates a damaged zone ahead of the crack…
Recently, irradiation assisted stress corrosion cracking (IASCC) of austenitic stainless steels for core internal components materials become a subject of discussion in light water reactors (LWRs). IASCC has not been found in Pressurized Water Reactors (PWRs). However, the authors have investigated on the possibility…
By using the two-liquid geometric method and the three-liquid acid-base method, we are the first to determine the surface tensions of ladderlike polyepoxysiloxanes by the measurement of contact angles on thin films. Three kinds of ladderlike polymers have been synthesized: AC (which has the alkyl group and the epoxy…
During the studies on fouling diatoms in Zuary estuary the overlying surface diatoms were also studied for comparison. In all 66 spp. of planktonic diatoms have been recorded, belonging to 29 genera. Out of these, 36 species (16 genera) were Pennales and 30 (13 genera) Centrales. The common diatoms observed were Chaet…
The rates of formation of the DCTA complexes of Ce3+, Eu3+ and Yb3+ are significantly lower than expected on the basis of the water-exchange rates of Ln3+(aq). The kinetics of formation of these complexes were studied by means of a stopped-flow method. The reactions were found to be first order in the reactants, and t…
Flax fibers coated with two types and various amounts of silicones are used to make flax-polyurethane composites. Coating conditions have been found to affect strongly the composites properties. The effect of these two types and different amounts of silicone on the impact toughness, flexural strength and modulus, dyna…
In this work we study the effect of the nixtamalization time on the structural, morphological and thermal properties of the corn pericarp. We also studied the semi-quantitative changes in the chemical composition of the pericarp by x-ray diffraction. By correlating the results obtained by x-ray diffraction and photoac…
The pathway of dehydration and intramolecular cyclization of lisinopril dihydrate in the solid state was investigated using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and a combination of thermal analyzer with Fourier transform infrared microspectroscopy (thermal FT-IR microscopic system…
The choice of polymeric materials in electronic packaging influences not only the performance parameters of electronic devices, but also their long-term reliability. Adverse conditions such as humidity, high temperature, and vibration prevent the electronic devices from functioning in the way that they were designed.…
The change of network morphology of unfilled sulfur crosslinked natural rubber exposed to thermal oxidative ageing has been studied. Three model networks with different sulfur contents (efficient network, semi-efficient and conventional vulcanizate) have been analysed by applying spin probe ESR, equilibrium swelling m…
The heat transfer coefficients during natural convection of water on a downward-facing horizontal surface and that on a vertical surface were measured under the influence of ultrasonic vibrations. The multi-type oscillation used in this experiment was able to operate at three frequencies—28, 45, and 100 kHz—not only c…