Materials Literature
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This work consists in the preparation of a biodegradable system starting from wood and polymer; this system being a support for the release of active agents. These starting materials used are poly(ε-caprolactone) (PCL), wood, the active agent being KCl. Initially the influence of water, wood and KCl on the reaction of…
Abstract Ethylene‐vinyl alcohol copolymer (EVOH)/clay nanocomposites were prepared via a dynamic melt‐intercalation process using a Brabender Plastograph or extruder. The phase morphology and the crystallization behavior of the nanocomposites were investigated, using differential scanning calorimetry (DSC), X‐ray diff…
The present study investigated the interactions of four different types of polyethylene (PE) surfaces with RF oxygen plasma components, simulating the low Earth orbit (LEO) environment. The samples were exposed in the plasma afterglow, with and without the plasma-generated vacuum UV (VUV) radiation. The polymers studi…
The utility of various synthetic hectorites for the preparation of active enzyme complexes by simple adsorption processes was examined. The smectites compared include commercially available Laponite RD, mesostructured hectorites (both with and without organic template), and silane-modified mesostructured hectorite. Th…
Dense alumina/5 vol% SiC nanocomposites were prepared by sol–gel processing using nanosized (180 nm) precoated SiC powders and a commercial boehmite sol. The SiC powder was precoated with boehmite by a controlled heterogeneous precipitation from an aluminum nitrate solution. The coated SiC powder was then dispersed in…
Different measurements were performed in cross-linked polyethylene (XLPE) employed as insulating material in coaxial cables that were field-aged and laboratory-aged under multistressing conditions at room temperature. Samples were peeled from the XLPE cable insulation in three different positions: just below the exter…
Three Ni-Mn-Ga alloys with different chemical compositions and nonmodulated tetragonal martensitic phase (NM) were studied. In two of the alloys, the polydomain nonmodulated tetragonal phase was obtained in cubic-tetragonal martensitic phase transformation at temperatures below and above Curie point, while in the thir…
The numerical simulation of mass transfer and conversion in spatially heterogeneous biofilms on the meso-scale requires an accurate description of the hydrodynamics in the biofilm systems and of spatial effects. This leads to systems of three-dimensional nonlinear partial differential equations that are numerically ve…
The advances in information communication have increased the usage of microwaves in the 0.5–5 GHz range because of the demand for the transmission of large amounts of data. Accordingly, the problem of electromagnetic interference has become increasingly serious, and therefore much attention has been paid to microwave…
The response of the Baltic diatom <i>Cyclotella meneghiniana</i> to iron deficiency was examined. The following growth parameters were measured: cell number, chlorophyll <i>a</i> and protein content. The results demonstrate the ability of this diatom to grow well with minimal iron availability; however, the rate of gr…
Frequency dependence of the dissipation factor tanδ, the permittivity ɛ, and the ac conductivity σ ac across the layers in the frequency range f =5×10 4 −3×10 7 Hz was studied in layered TlGaS 2 single crystals. A significant dispersion in tanδ was observed in the frequency range 10 6 −3×10 7 Hz. In the range of frequ…
In the 2003 test cycle at the NCAT Test Track, a structural experiment was included to investigate dynamic pavement responses under live truck loading. Instrumentation was installed in different layers of the pavement structures in sections N1 through N8. Data from the instruments are collected in two ways: a data log…
Most facilities for testing the stability of spacecraft materials under attack by fast atomic oxygen (AO) are based on the generation of hypersonic beams of AO in nozzle sources with the use of continuous electrical discharges or in laser pulse-induced breakdown of the gaseous oxygen. In both cases, the sources of fas…
Abstract The effect of iodate (IO 3 − ), metavanadata (VO 3 − ) and molybdate (MoO 4 2− ) anions on the passivation of Ti‐6Al‐4V alloy in sulfuric and hydrochloric acid solutions was studied using open‐circuit potential measurements, polarization techniques and electrochemical impedance spectroscopy (EIS). The alloy s…
The use of catalytic converters in automobiles is mandatory to reach current emission limits for toxic engine byproducts. The goal of zero-emissions remains elusive for internal combustion engines, yet tightening of legislation towards this ideal continues. To meet this demand, scientists and engineers must further th…
Abstract Two polyethylene/polypropylene (PE/PP) in‐reactor alloy samples were synthesized by multi‐stage gas‐phase polymerization using a spherical Ziegler–Natta catalyst. The alloys show excellent toughness and stiffness. FTIR, 13 C‐NMR and thermal analysis proved that the alloys are mainly composed of polyethylene,…
West Indian cherry (Malpighia glabra L.) and pineapple (Ananas comosus (L.) Meer)juice clarification by cross-flow UF, using polysulphone hollow fiber and ceramic tubular membranes with, respectively, nominal molecular weight cut off values of 100kDaltons and average pore diameters of 0.01mm, were studied. The influen…
In this study, forty-eight different chenille yarns are produced on a chenille machine using a range of material types, twists, and gauges. In the first group, 4 Nm count chenille yarns are produced with six different pile materials, two different twists, and two different gauges. In the second group, 6 Nm count cheni…
peer reviewed
This paper presents a study of the mechanical and thermal properties of SMA microvalves, which are driven by a microactuator of a NiTi foil or a Ni 2 MnGa thin film. By coupled finite element simulations, von Mises stress profiles and resulting actuation forces are determined, which are compared with experimental forc…