Materials Literature
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ConclusionLanthanides, as alternative probes to conventional fluorophores, can lead to enhanced sensitivity in applications where autofluorescence is a problem. Multiple labeling with lanthanide chelates have been shown to be an effective method for further increases in sensitivity. These probes, being nonisotopic, av…
We fabricated a UV-sensitive photofunctional device using evanescent field coupling between a side-polished single-mode optical fiber (SMF) and photochromic dye-dispersed polymer planar waveguide (PWG). PWG was made by diarylethene derivative [1,2-bis(2,5-dimethylthiophen-3-yl) hexafluoro-cyclopentene (DM-BTE)] with a…
The paper deals with the fractal analysis of the creeping discharge propagating over different solid insulators immersed in mineral oil under negative impulse voltage using a point-plane electrode arrangement. The fractal dimension is estimated thanks to the box counting method. We observed that the creeping discharge…
An electric strength (ES) test campaign in alternated current and space charge (SC) measurements via the pulsed electro-acoustic (PEA) method has been carried out on films of low-density polyethylene (LDPE) nanocomposites. The nanocomposite materials were obtained by the dispersion by melt mixing of organically modifi…
In recent years, some researchers have studied about shape memory alloy composites (SMACs) which consist of a shape memory alloy (SMA) reinforcement and polymer or metal matrix. In particular, considerable attention has been paid to the creation of internal stress in a matrix of SMAC. Internal stress in a matrix can b…
Partial discharges in (power) transformers are often a predecessor of a serious fault. For this reason partial discharge measurements are an important diagnostic tool to monitor the insulation condition of a transformer. For on-line measurements, a detection method based on the high-frequency (UHF) signals emitted by…
Carbon fibers having nanoscale dimensions have been known for well over a hundred years. In 1889, a U.S. patent was awarded to Hughes and Chambers for teaching a method for growing carbon filaments from ‘swamp gas’ — primarily methane — using a metallic crucible which, unwittingly, catalyzed the reaction [1]. Until th…
Isothermal thermogravimetric analysis is used as analytical technique for short-term thermal endurance characterization of nanostructured isotactic polypropylene. The nanofiller consists of organophilic-modified fluorohectorite, that is, a layered silicate. It is shown that the temperature index improves considerably…
Space charge results under DC-voltages have been used to compare samples taken from peelings of cables AC-aged under different specified thermal and electrical conditions with unaged and service-aged specimens. The aim is to identify quantities that have been altered during ageing. All samples were thermally treated t…
Partial discharge (PD) on-line monitoring and diagnosis is an important tool to assess the condition of power equipment. Different PD sources have different effects on the insulation performance of power apparatus. Therefore, identification of PD sources is of interest to both the power equipment manufacturers and uti…
The three-dimensional structure of Rv2607, a putative pyridoxine 5'-phosphate oxidase (PNPOx) from Mycobacterium tuberculosis, has been determined by X-ray crystallography to 2.5 A resolution. Rv2607 has a core domain similar to known PNPOx structures with a flavin mononucleotide (FMN) cofactor. Electron density for t…
We develop the characterization of the dynamics at the noise-perturbed edge of chaos in logistic maps in terms of the quantities normally used to describe glassy properties in structural glass formers. Following the recognition [Phys. Lett. A 328, 467 (2004)] that the dynamics at this critical attractor exhibits analo…
A 64-kHz sandwich transducer employing a tube-shaped Terfenol-D/epoxy pseudo 1-3 magnetostrictive composite with 0.61 Terfenol-D volume fraction was developed to alleviate the intrinsic eddy-current losses in magnetostrictive alloy-based transducers. The transducer was designed to operate as a half-wave, longitudinal,…
Abstract Summary: A comparative study of the effects of alkali metal ions Li + , Na + , K + , Rb + , and Cs + on the liquid crystalline organization of high‐molecular‐weight calf thymus DNA using polarized light microscopy was performed. Major differences in the behavior of Li + as compared to the other ions were foun…
The use of organically chelated lanthanides in diagnosis and treatment is a rapidly growing field in medicine. In order to gain a deeper understanding into the properties of these chelates, particularly spectroscopic, density-functional calculations have been performed on a series of lanthanide ions chelated with 1,4,…
This paper deals with an investigation of the relationship between partial discharge (PD) activity and aging of PWM-controlled motors. Online and offline PD measurements were carried out with the purpose of evaluating PD inception voltage, amplitude and repetition rate on motors aged by different electrical stresses.…
We present a detailed study of the Nernst effect ${S}_{zx}$ in ${(\mathrm{TMTSF})}_{2}\mathrm{P}{\mathrm{F}}_{6}$ as a function of temperature, magnetic field magnitude, direction, and pressure. As previously reported there is a large resonantlike structure as the magnetic field is rotated through crystallographic dir…
A thermally stable modulator using a novel Diels-Alder crosslinkable electrooptic (EO) polymer was fabricated. This new material system presents a smartly controlled process to overcome the EO coefficient-thermal stability tradeoff of conventional thermosetting EO polymers and obtains poling efficiency and thermal sta…
This paper presents the electrical insulation properties of a newly-developed composite material comprising a nano- and micro-filler mixture. The filler mixture composite was made by dispersing layered silicate fillers and silica fillers in epoxy resin. The filler mixture composite had the same low thermal expansion a…
Multi-air voids space-charge electrets have been developed using two fluorethylenepropylene (Teflon-FEP) films. In this work, a new technique developed to assembler these films allows the control of the thickness and shapes of multi-air voids distributed on their surface. When an impulse voltage process charges these…