Materials Literature
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Abstract Stereoblock poly(lactic acid) (sb‐PLA), consisting of poly(L‐lactic acid) (PLLA) and poly(D‐lactic acid) (PDLA) in a blocky sequence, can successfully be synthesized by solid‐state polycondensation of a stereocomplexed mixture of PLLA and PDLA. First, the melt polyconden‐sation of L‐ and D‐lactic acids is con…
A methodology is presented for the design synthesis of metamaterial ferrites, or metaferrites, that retain their desirable magnetic properties at frequencies above 1 GHz. The design synthesis is accomplished by optimizing a high impedance frequency selective surface (HZ-FSS) structure via a genetic algorithm (GA) for…
The temperature behavior of various relaxor-PT piezoelectric single crystals was investigated. Owing to a strongly curved morphotropic phase boundary, the usage temperature of these perovskite single crystals is limited by TR-T--the rhombohedral to tetragonal phase transformation temperature--which occurs a significan…
Abstract Recent advances in the controlled ring‐opening polymerization (ROP) of cyclic aliphatic esters are reviewed with a particular attention to thermodynamics and kinetics of the polymerization of industrially important monomers, namely: lactide (LA), 1,4‐dioxan‐2‐one (DX), and ϵ‐caprolactone (CL). For comparison,…
Online partial discharge (PD) testing has become a powerful tool to plan the maintenance of stator windings of high voltage motors and generators. Interpretation of PD data is best done by monitoring the trend in PD over time. Unfortunately the trend in PD is sometimes difficult to ascertain, especially if the humidit…
Commercial‐grade Si 3 N 4 –TiN composites with 0, 10, 20, and 30 wt% TiN content have been characterized. Submicrometer grain‐size Si 3 N 4 was reinforced with fine TiN grains. Density, Young's modulus, coefficient of thermal expansion, and fracture toughness increased linearly with TiN content. Increased strength was…
The purpose of this study was to develop titanium-silver alloys with biocompatibility, high corrosion resistance, and low ion-release rate, and to evaluate the electrochemical properties of titanium-silver alloys in artificial saliva. Titanium-silver alloys with silver contents ranging from 0 to 4.5 at % in steps of 0…
Second‐order nonlinear optical (NLO) properties of polymeric materials have been attracting a lot of attention, especially for such potential applications as fast waveguides electrooptic (EO) modulation and frequency‐doubling devices. For these photonic applications, the performance of the NLO materials has to be opti…
Abstract Hydrophobic biodegradable polyesters, poly(L‐lactide) (PLLA) and poly(lactide‐ co ‐glycolide) (PLGA), were electrospun on different types of collectors to induce morphological changes in the nanofibrous membrane. On the metal collector smooth nonwoven membranes were obtained for both PLLA and PLGA, while on t…
Raman and surface-enhanced Raman scattering (SERS) spectra of calf thymus DNA were investigated. We have carried out improvements to the silver colloid preparation method of Lee and Meisel in two respects. In one method, the silver sol was boiled with rapid stirring for over two hours. In the second method, the silver…
Experimental results are presented for light-on-light modulation at low rates using coupling to nonradiative surface plasmons and their associated thermal effects in a thin gold foil. It is first shown that several modulated Gaussian beams simultaneously exciting surface plasmons in the same region of a thin gold film…
The selective oxidation of trans-methylstyrene, a phenyl-substituted propene that contains labile allylic hydrogen atoms, has been studied on Cu{111}. Mass spectrometry and synchrotron fast XPS were used to detect, respectively, desorbing gaseous products and the evolution of surface species as a function of temperatu…
We investigated the growth process of carbon nanowalls (CNWs) on a SiO 2 substrate by microwave plasma-enhanced chemical vapor deposition (MPECVD). It is revealed that the CNWs are grown at the fine-textured structure on the SiO 2 and the growth process does not require the catalyst. The CNW initially has a semicircul…
Over the last decade, applications of fibre-reinforced composites using polymer matrices have seen tremendous growth. In spite of the complexity of their behaviour and the unconventional nature of fabrication and other aspects, the usage of such composites, even for primary loadbearing structures in military fighters…
To evaluate the potential of carbon nanotube field effect transistors (CNFETs) to replace silicon CMOS technology, we develop a SPICE model of CNFET nanoelectronics. Our model is parameterizable, and it enables composition of models of various aspects of nanoelectronic behavior. Comparing CNFET nanoelectronics against…
It is essential to detect partial discharge (PD) as a symptom of insulation breakdown in gas-insulated substations (GIS). However, the accuracy of such measurement is often degraded due to the existence of noise in the signal. In this paper, a method using wavelet packet transform and neural network is proposed to sep…
Abstract Abiotic–biotic mechanisms of microstromatolitic spicular sinter (geyseritic) initiation and development were elucidated by in situ growth experiments at Champagne Pool (75 °C, pH 5.5). Siliceous sinter formed subaerially on glass slides placed along the margin of the hot spring. Environment–silica–microbe int…
The refraction of phase and power at the interface between free space and anisotropic media is studied. Under a TE incidence (electric field along y/spl circ/) and k/sub y/=0 incidence (where k/sub y/ is the y/spl circ/ component of the wave vector), a closed-form generalization of Snell's laws is proposed. The two re…
Samples from the saprolite and extensive smectite zone (up to 25 m thick) of the Murrin Murrin lateritic nickel deposit, developed from serpentinised peridotites, were studied using optical microscopy, XRD, SEM and TEM-EDX. In the saprolite zone, the initial mesh-texture of the parent rock is still well preserved. The…
This paper has experimentally investigated transient behavior of grounding electrode systems especially for a high impulse current up to 40 kA in particular reference with a mutual grounding resistance between the electrodes. The experimental results show that the mutual grounding resistance depends on the applied cur…