Materials Literature
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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…
Abstract Aqueous anionic blocked aromatic polyurethane prepolymers were synthesized by a prepolymer mixing process and their dispersions were obtained by adding water to the blocked prepolymer solutions. A series of prepolymers were prepared by using toluene 2,4‐diisocyanate, 4,4′‐diphenylmethane diisocyanate, polytet…
Aktive Passivatoren: Der überraschende Wiederanstieg der Lumineszenzintensität von CdSe-Quantenpunkten zwischen 200 und 300 K unterstreicht, wie wichtig die Wechselwirkung zwischen der Deckschicht und dem Nanokristall-Halbleiter ist. Während die Lumineszenz bei 160 K nur schwach ist (links), leuchtet die Probe bei 300…
Blends of amphiphilic poly(dimethylsiloxane) (PDMS) and a model polyhedral oligomeric silsesquioxane (POSS) nanofiller, trisilanolisobutyl-POSS, form homogeneous monolayers at the air/water interface. At high POSS content (>80 wt %), a thermodynamic analysis of surface pressure−area per monomer (Π− A ) isotherm data s…
The objective of this research was to develop and characterize composite biofilms produced using wheat gluten and cellulose acetate phthalate. Biofilms act as barriers to moisture and oxygen diffusion through the film. The films were prepared with different thicknesses and component concentrations and were analyzed fo…
A novel class of nonconjugated polysquaraines consisting of isolated chromophores bridged by variable receptor linkers has been synthesized by a two-step one-pot procedure. Substantial reorganization of the polymer backbone conformation occurs upon external physical or chemical stimuli, leading to characteristic absor…
Abstract The structural behaviour of a haüyne with a chemical composition of Na 4.35 Ca 2.28 K 0.95 [Al 6 Si 6 O 24 ]- (SO 4 ) 2.03 , at room pressure and from 33 to 1035°C on heating, was determined by using in situ synchrotron X-ray powder diffraction data (λ = 0.92249(5) Å). The satellite reflections in haüyne are…
Glasses in a wide range of chemical composition were thermally poled and the stability of the second-order optical nonlinearity induced was studied through isothermal annealing experiments. Enhanced stability was found in aluminosilicate and aluminoborosilicate with respect to silica (at least a five order of magnitud…