Mechanical Effects in the Cahn-Hilliard Model: A Review on Mathematical Results
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RAMAN SPECTRA OF AsxSe100-x GLASSES DOPED WITH METALS
Chalcogenide glasses in the system AsxSe100-x, as well as As40Se60 and As50Se50 glasses doped with metals (Bi, Ge, Cd, Ag, Sn, Mn, Dy and Sm) were investigated by Raman spectroscopy. The Raman spectra of AsxSe100-x with 0x10 suggest that the majority building units are Se chains and Se8 closed rings. At higher As cont…
Photo-crystallography: from the structure towards the electron density of metastable states
A photo-crystallographic study of Fe(btr) 2 (NCS) 2 ·H 2 O was performed in order to describe the modification of structures and charge densities on going from the ground low spin (LS) state to the metastable high spin (HS) state during the LIESST phenomenon at 15 K. Related photo-magnetic and spectroscopic measuremen…
Chemical polymerization of aniline in phenylphosphinic acid
The chemical polymerization of aniline was performed in phenylphosphinic acid (APP) medium using ammonium peroxidisulfate as the oxidizing agent, at 0 ?C and 25 ?C. The yield of polyaniline (PANI) was about 60?69 %. The polymerization process required an induction time 8?10 times greater than in other acids (hydrochlo…
Analysis of the Mechanical Properties of Woven and Nonwoven Fabrics as an Integral Part of Compound Fabrics
In this paper the difference between the mechanical properties of woven and nonwoven fabrics is presented, and the important role of constructional parameters (particular the cover factor) of reinforcement fabric in the compound fabric is stressed. Some basic mechanical properties, such as tensile strength, elongation…
Novel synthetic approach to creating PtCo alloy nanoparticles by reduction of metal coordination nano-polymers
PtCo alloy nanoparticles with different metal elemental ratios (Pt/Co = 0.9, 1.6, 2.9, and 3.6) were prepared by a novel synthetic approach, using the transformation reaction of platinum(IV)/cobalt tetracyanoplatinate metal coordination nano-polymers (Pt(II)-CN-Pt(IV)/Co)via a H2 gas-phase reduction.
Removal of Lead from Copper Alloy Scraps by Compound-Separation Method
Recently, the global scale environmental problem has become a critical issue. In metallic material, not only the cost reduction and improvement of mechanical properties but also the decrease in environmental load is required. In copper alloys, several mass% Pb was added to improve the machinability. However, due to th…
Chemically Retted Kenaf Fibers
Alkali-retting was applied to kenaf bast ribbons and the mechanical properties and the structure of the retted fibers were investigated. In order to produce the fibers with preferable surface smoothness, the retting should be made at the NaOH concentration higher than 4 %. The tensile properties, however, showed a max…
Mechanism of low-voltage field emission from nanocarbon materials
Field emission from nanostructured carbon materials is analyzed by applying the model of emission center in which the emitting surface contains two phases of carbon having substantially different electronic properties. In accordance with this model, the proposed mechanism involves electron tunneling through two potent…
The Influence of the Ethanol-water Molar Ratio in the Precursor Solution on Morphology and Photocatalytic Activity of Pyrolytic ZnO Films¶
Zinc oxide films were fabricated by a homemade spray pyrolysis system equipped with an optical setup ensuring the in situ control of the film growth. Zinc acetate (0.1 M) diluted in a mixture of ethanol and water was used as the precursor solution. The ethanol-water molar ratio, gamma, in the precursor solution was va…
Synthesis and characterization of bismaleimide‐polyetherimide‐silica hybrid by sol‐gel process
Abstract A ternary hybrid of bismaleimide‐polyetherimide‐silica (BMI‐PEI‐SiO 2 ) was synthesized by sol‐gel reaction and characterized by scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results indicated that…
Characterization of polymer materials using FT-IR and DSC techniques
This work studies the influence of the climatic conditions during the Canadian winter using high-density PE (HDPE) samples exposed to weather conditions during different periods of time. Under these conditions, it is reasonable to think that the chemical changes caused by the climatic degradation will at first sight b…
Caracterización diatomológica en tres cuerpos de agua de los humedales de Jilotepec-Ixtlahuaca, Estado de México
The taxonomic and environmental characteristics of the diatom flora found in three bodies of water in the wetlands of Jilotepec-Ixtlahuaca, Estado de Mexico are described. Six samplings were made (January-October, 2001). Benthic and planktonic diatoms growth were collected.The samples were analyzed with a Light Micros…
Dynamics of layered Jahn–Teller crystals of rare-earth compounds (Review)
Spectroscopic data on crystals of rare-earth compounds having structural instability due to the cooperative Jahn–Teller effect are reviewed. Based on an analysis of these data, it is inferred that the dynamic coupling of low-frequency electronic excitations of the rare-earth ions with crystal lattice vibrations plays…
Role of Iron for Hydrogen Absorption Mechanism in Zirconium Alloys
The latest PIE results of Zry-2 and HiFi alloy (0.4 %Fe-Zry2) showed that iron addition reduces the hydrogen pick-up ratio. In order to clarify this lower hydrogen absorption mechanism, three types of experiments were carried out for both alloys: (1) Measurements of the hydrogen pick-up ratio in the pre-transition reg…
The Correlation Between Microstructures and in-BWR Corrosion Behavior of Highly Irradiated Zr-based Alloys
The microstructures of four kinds of Zircaloy-2-type materials with neutron exposure up to about 15 × 1025 n/m2 (E>1MeV) were examined to investigate the microstructural evolution and to correlate it with the in-reactor corrosion behavior at very high fluences. The materials examined in this study included two…
The Use and Performance of Wrought 625 Alloy in Primary Surface Recuperators for Gas Turbine Engines
Recuperation increases the efficiency of a gas turbine engine by extracting heat from the exhaust gas stream and using it to pre-heat the compressor discharge air. High temperature oxidation and creep are major concerns, necessitating the use of heat-resistant alloys for the recuperator panels. Most current recuperato…
Co-application of Sodium Polyphosphate and Chitosan to Improve Flame Retardancy of Cotton Fabric
An attempt to improve the durability of the flame retardancy to washing of water soluble phosphate-based flame retardant on cotton fabric was studied. In this study, the poorly substantive phosphate treated fabric was further padded with chitosan solution. After drying, the chitosan formed film layer covering the fabr…
The preparation of novel blends of Ultra High Molecular Weight Polyethylene with polymethacrylate based copolymers using supercritical carbon dioxide
Supercritical carbon dioxide (scCO2) was utilized to impregnate ethyl methacrylate (EMA) and propyl methacrylate (PMA) monomers within an Ultra High Molecular Weight Polyethylene (UHMWPE) matrix where they were subsequently copolymerised in situ. The ratio of EMA to PMA was varied in the monomer feedstock in order to…
Troponoid metallomesogens with 5-alkoxy, 5-alkoxycarbonyl, 5-alkanoyloxy, 5-alkyl, 5-alkoxy-2-amino, and 5-alkoxy-2-alkylamino substituents
Metal complexes (Cu, VO, Zn, Mn, and Ni) with 5-alkoxy-, 5-alkoxycarbonyl-, 5-alkanoyloxy-, and 5-alkyl-tropolonato structures as well as bis(5-alkoxy-2-aminotroponato)copper were synthesized. All bistropolonato Cu complexes showed ordered smectic phases such as hexatic smectic B, smectic G(J), and smectic H phases. T…