Materials Literature
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The influence of Deep Cryogenic Treatment (DCT) on the properties of four wrought and PM high speed steels was investigated. Hardness and (apparent) fracture toughness Ka were measured to highlight the possible influence of DCT carried out before and after tempering. Dry sliding wear tests were carried using a block o…
Este trabalho teve como objetivos avaliar a influência da massa específica do painel aglomerado sobre suas propriedades mecânicas e verificar os níveis de correlações entre as variáveis estudadas. Foram produzidos painéis com massa específica nominal de 0,60, 0,70, 0,80 e 0,90 g/cm³, utilizando-se partículas de Pinus…
The molecular and electronic structure of monomeric ([Fe(S2C2H2)2](z), [Fe(S2C2(C6H4-p-OCH3)2)2](z)) and dimeric ([{Fe(S2C2H2)2}2](z)) iron bis(dithiolene) complexes, and of their phosphine adducts ([(PH3)Fe(S2C2H2)2](z), [(P(C6H5)3)Fe(S2C2H2)2](z), [(PH3)Fe(S2C2(C6H4-p-OCH3)2)2](z)), carrying various charges (z = 0,…
With an aim to enhance low temperature impact strength, blends of PP-cp (Impact Grade PP) and metallocene-catalyzed plastomer (EXACT ® ethylene-α-octene copolymer) were prepared using a co-rotating, intermeshing twin-screw extruder in 90 : 10, 80 : 20, 70 : 30, and 60 : 40 weight ratio. Rheological properties studied…
We report the synthesizing and characterization of the hole-doped Ni-based superconductor ${\text{La}}_{1\ensuremath{-}x}{\text{Sr}}_{x}\text{NiAsO}$. By substituting La with Sr, the superconducting transition temperature ${T}_{c}$ is increased from 2.4 K of the parent phase LaNiAsO to 3.7 K at the doping levels $x=0.…
We report a study of the exchange bias of a high quality perovskite cobaltite La 0.82 Sr 0.18 CoO 3 single crystal with spin glass (SG) like nature. According to the dependence of exchange bias field on the cooling field, an antiferromagnetic (AFM) interfacial exchange coupling constant at the spin-glass region J i ≈−…
Microstrip lines loaded with series gap discontinuities and compact metamaterial particles-complementary Archimedean spiral resonators-are investigated. The theory of periodic structures is applied for establishing the propagation characteristics of infinite lines from full-wave electromagnetic simulations. Thanks to…
The effects of physisorbed polymer molecules on carbon nanotubes dispersed in a soft polymer matrix on the resulting mechanical strength of the nanocomposite are reported. From measurements of the large-strain deformation of the nanocomposites, the shear strength, τ, of the nanotube/matrix interface was determined as…
We show that in molecular ${\text{Ni}}_{4}$ clusters with ${S}_{4}$ symmetry, not only the local anisotropy but also the antisymmetric exchange interaction contributes to the observed fourth-order anisotropy terms in the single-spin Hamiltonian. From a group-theoretical classification of the exchange-coupled multiplet…
We show that fractional charges bound to topological defects in the recently proposed time-reversal-invariant models on honeycomb and square lattices obey fractional statistics. The effective low-energy description is given in terms of a "doubled" level-2 Chern-Simons field theory, which is parity and time-reversal in…
The second-order displacive phase transition in ${\text{SrTiO}}_{3}$ at ${T}_{C}\ensuremath{\sim}105\text{ }\text{K}$ has been the subject of much debate. For temperature $T$ above and near ${T}_{C}$, energy scans by neutron scattering have shown a central peak (CP) at the $R$ point in the Brillouin zone in addition t…
Chemical complexation, in which certain metal ions (especially Ag+ and Cu+) reversibly and selectively complex olefin isomers, was used to separate 1-hexene from a mixture of internal hexenes as an attractive alternative to traditional distillation. Several potential reactive extractants were investigated for their se…
We developed new cross-liker for the PDLC application that includes the bisphenol A and tris(hydroxyphenyl)ethane moieties in the structure with bis- or tris-acrylate at the end of molecules to induce photo-polymerization. Although the cross-linker was added as small as 2% ∼ 10% (more ratio) to compare with monomer, t…
Abstract A brief review is given on the electronic and optical properties of carbon nanotubes. The topics include an effective‐mass description of the electronic states, optical absorption and excitons, two‐photon absorption, excitons in metallic nanotubes, their fine structure and the Aharonov–Bohm effect, and excito…
Abstract Glassy carbon electrodes are modified with a thin film of a cellulose‐chitosan nanocomposite. Cellulose nanofibrils (of ca. 4 nm diameter and 250 nm length) are employed as an inert backbone and chitosan (poly‐ D ‐glucosamine, low molecular weight, 75–85% deacetylated) is introduced as a structural binder and…
Abstract Polyurethanes (PUs) were prepared by condensation of isophorone diisocyanate and polypropylene glycol (PPG) using butane diol as a chain extender. Methoxy or methacrylic endgroups of PUs were obtained upon reacting the residual isocyanate group (NCO) moiety with either methanol or hydroxyethylmethacrylate (HE…
Carboxylated polypyrrole (CPPy) nanotubes were fabricated by the chemical copolymerization of pyrrole and pyrrole-3-carboxylic acid (P3CA) using cylindrical micelle templates. Importantly, the chemical functionality of CPPy nanotubes was determined by the input amount of P3CA and their redox property was also retained…
The effect of some mono azo dye compounds on the dissolution of carbon steel (type L-52) in 2M hydrochloric acid solution was studied using weight loss and galvanostatic polarization techniques. The inhibition efficiency was found to increase with increasing inhibitor concentration and decreasing temperatures. Inhibit…
Abstract In order to elucidate the origin of gain‐narrowed photoluminescence spectra of 5,5″‐bis(4‐biphenylyl)‐2,2′:5′,2″‐terthiophene (BP3T) single crystals, the dependence of excitation energy threshold on excitation lengths was studied at 12 K. The emission peak of the 0‐1 vibrational band was narrowed at a constan…
Als Streifenmuster auftragbar: Mithilfe einer weichen Lithographiemethode können Nanomuster der Spinübergangsverbindung 1 erzeugt werden. Die geordneten kristallinen Mikrostrukturen bilden Streifen auf Siliciumdioxidoberflächen. Als mögliche Anwendungsgebiete kommen elektronische Funktionseinheiten und die Information…