Materials Literature
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The relationship between pore size and air permeability in two spunlaced fabrics and two spunbonded/meltblown/spunbonded (SMS) fabrics were investigated. Minimum, maximum and mean flow pore sizes were determined using liquid porosimetry. The influence of fabric weight and thickness on air permeability and pore sizes w…
Neste trabalho o efeito da adição de 2 a 7% em peso de um copolímero tribloco estireno-b-etileno-co-butileno-b-estireno (SEBS) em uma blenda polipropileno/poliestireno de alto impacto (PP/HIPS) 70:30 foi determinado. As propriedades em tração e impacto, temperatura de amolecimento Vicat e morfologia da blenda PP/HIPS…
A strong surface-enhanced Raman scattering (SERS) from TiO2 nanoparticles is firstly obtained in a nanostructural Ag–TiO2 calabash-like hybrid particle powder synthesized by γ-radiation combined with a hydrothermal treatment. Visible luminescence, due to the interband transitions of TiO2 nanoparticles, is broadened by…
The numerical performance of a finite-difference modal method for the analysis of one-dimensional lamellar gratings in a classical mounting is studied. The method is simple and relies on first-order finite difference in the grating to solve the Maxwell differential equations. The finite-difference scheme incorporates…
Optical fibres that are permanently installed in nuclear reactors (fission or fusion) or at high energy physics accelerators can accumulate considerable long-lived radiation-induced loss. Four different fibre types were irradiated up to dose values from 10/sup 3/ to 10/sup 6/ Gy and an attempt was made to reduce the r…
Melts of the alloys Al-Pd-Mn, Al-Co, and Al-Fe are containerlessly undercooled and solidified using the technique of electromagnetic levitation. The (quasi)crystal growth velocity is measured as a function of undercooling for the various phases by a high-speed infrared photosensing device. Additionally, a video image…
An experimental investigation was performed to study the rate at which strength‐controlling fatigue damage evolves in a ceramic‐matrix composite. Tensile specimens of a unidirectional SiC‐fiber‐reinforced calcium aluminosilicate matrix composite were cycled to failure or to a preselected number of cycles under similar…
Magnetic cation of Co 2+ was incorporated in a monovalent [Ni(dmit) 2 ] - (2-thioxo-1,3-dithiole-4,5-dithiolate) salt by using the supramolecular framework of 15-crown-5. The π-spins of [Ni(dmit) 2 ] - formed a one-dimensional Heisenberg antiferromagnetic linear chain, while the d-spin of Co 2+ behaved as a free S = 3…
Abstract A diarylethene1 having cholesterol units was synthesized in an attempt to use it as a dopant to control the phase of liquid crystals. By the addition of the diarylethene, 4-cyano-4′-pentylbiphenyl (K-15)(Tokyo kasei) nematic liquid crystal showed cholesteric liquid crystalline texture. Upon irradiation with U…
In this paper new observations of a laser-generated cavitation bubble interacting with an inertial boundary are presented. Employing schlieren photography techniques and a thin film transducer placed on the surface of the boundary, the pressure stresses induced in the solid boundary and the surrounding fluid by collap…
Abstract A structural model is proposed for illite-smectite (I-S) from diagenetic environments which accounts for the presence of three different layer types which are defined as follows: montmorillonite (low-charge, octahedrally substituted, fully expandable), vermiculite (high-cha rge, octa- and tetrahed rally subst…
The main purpose of this research work was to investigate the response of wood flour reinforced polyethylene composites to 2 hours water boiling, five complete boiling and freezing cycles and fungal (Gloeophyllumm Traebum/Brown-rot fungus) exposure. Five composite formulations were manufactured and analyzed (0, 50, 60…
Diamond-like carbon (DLC) films have been deposited by a magnetically enhanced plasma (MEP) chemical vapor deposition (CVD) system. The properties and structures of DLC films deposited by MEP-CVD using various gases (methane, He/methane, Ne/methane, and Ar/methane) were studied. The mechanical properties in terms of h…
The kinetics of the solid state chemical reaction of silver with amorphous As33S67 films in a conventional sandwich structure was measured by optically monitoring the change in thickness of the undoped chalcogenide. For the thermally stimulated process, the kinetics data indicate a two-stage process, with the second s…
Changes in the lamellar structure during heating and cooling of a nylon 6,6 polymer were characterized using synchrotron small-angle x-ray scattering (SAXS). The SAXS data were analyzed using two different methods and the derived structural parameters were compared with each other. The first met hod was the convention…
Fractal geometry is used to objectively evaluate the surface ruggedness of fabric wrinkles and seam puckers. To measure the fractal dimension (FD) of wrinkles and puckers, both the spatial cubical box-counting method and the cross-sectional method are employed. The results of the fractal dimensions of wrinkles and puc…
The stable corona discharge has found use in a large number of electrostatic applications and one of their important properties is the inception voltage which can be easily and accurately measured. The empirical Peek's law which yields the corona inception field is previously made in standard air for wire-to-cylinder…
Abstract Some quinolinol derivatives possessing suitable triplet state energy were examined to sensitize the luminescence of neodymium ion (Nd(III)) as coordinating ligands. Photosensitized luminescence in the near-infrared region of four neodymium(III) complexes: tris(8-quinolinolato)neodymium(III) ([Nd(q)3]), tris(5…
Abstract The pink clays from the Tagus basin, Spain, were characterized by X-ray difraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Chemical data were obtained by plasma emission spectroscopy and analytical electron microscopy (AEM), and specif…
The paper elucidates on some of the potential systems benefits and provides an update of progress in major high-temperature superconductor (HTS) transformer development programs worldwide. It begins with background sections on earlier low-temperature-superconductor (LTS) transformer developments and on transformer los…