Materials Literature
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AC losses due to nonsinusoidal current waveforms have been found by calculating the losses at harmonic frequencies when the Fourier coefficients are known. An optimized foil or layer thickness in a winding may be found by applying the Fourier analysis over a range of thickness values. This paper presents a new formula…
We have developed a forceps system which includes an active mechanism. This forceps is intended to assist the physician during laparoscopic surgery, and is constructed of four shape-memory alloy tubes. The temperature of the Ti-Ni shape-memory alloy is controlled electrically, achieving a fast response. The paper desc…
The magnetocaloric effect in high spin Mn 12 2Cl-benzoate clusters was studied. We observed a high entropy change around the blocking temperature of the magnetization. Theoretical simulations indicate the shift of the entropy change with the sweeping rate of the magnetic field.
This paper proposes equivalent circuits to represent the external electrical behaviour of multiwinding transformers. All aspects of the linear behaviour, including resonances and inter-winding devices to currents, are taken into account. The global physical components approach leads to general lumped element circuits…
As the R/sub p/ of ion implants steadily decreases, an ever-increasing percentage of the implant species lies in the oxide layer and is, therefore, not electrically active. For this reason it is important to have analytical techniques capable of accurately measuring the thickness of ultrathin oxide layers. A round-rob…
Practical implementation of fiber-endface waveguide gratings entails thin-film deposition and diffraction grating fabrication. Homogeneous dielectric thin-film coatings deposited on fiber endfaces are commercially available for applications such as antireflection coatings or spectral filtering. However, fabrication of…
Abstract The rheological behavior of ethylene propylene diene monomer (EPDM) compounds containing ground EPDM waste (W‐EPDM) of known composition was studied by using a Monsanto processability tester in a temperature range of 90–110°C and a shear rate range of 306.7–1533.24 s −1 . It is found that the shear viscosity…
The plasma-chemical hybrid process developed was extremely effective and economical in comparison with the conventional selective catalytic reduction (SCR) system and other technologies for NO/sub x/ removal from thermal power plant flue gas emissions. A series of experiments were performed to quantify all the reactio…
Abstract In an attempt to provide polyolefins such as low‐ and high‐density polyethylene and polypropylene with autohesive properties, hydrophilic monomers such as methacrylic acid (MAA), acrylic acid (AA), and 2‐(dimethylamino)ethyl methacrylate (DMAEMA) were photografted onto their surfaces. The wettabilities of the…
Ceramic insulators installed in a 400 kV line located in a semidesertic area in Monterrey, Mexico have registered flashover caused during critical pollution (high amount of low solubility material) and wetting conditions (dense fog). In previous studies, the contaminant deposited on these insulators was chemically and…
Thermal modeling of device packages requires accurate thermophysical property data for package materials. Accurate data for the thermal resistance of the adhesive bondline used to attach a high power device to a substrate is critical because this thermal resistance can be a significant part of the total thermal resist…
As interconnect feature sizes continue to scale to smaller dimensions, long interconnect can dominate the IC timing performance, but the interconnect parameter variations make it difficult to predict these dominant delay extremes. This paper presents a model order-reduction technique for RLC interconnect circuits that…
The demand on thermoplastic encapsulation of coils and electronic devices has been increased recently as an alternative to thermosets for electrical insulation, heat dissipation and physical protection of the encapsulated devices from harsh environmental operating conditions. Compared with thermosets, thermoplastics o…
We have introduced a theoretical scheme for the efficient description of the optical response of a cluster based on the time-dependent density functional theory. The practical implementation is done by means of the fully fledged time-dependent local density approximation scheme, which is solved directly in the time do…
Abstract Four novel Schiff‐type chitosan (CTS)‐crown ethers were synthesized through a reaction between NH 2 in CTS or crosslinked chitosan (CCTS) and CHO in 4′‐formylbenzo‐crown ethers, and four secondary‐amino‐type CTS‐crown ethers were prepared through the reduced reaction of NaBH 4 , respectively. Their structur…
In this paper, several interconnect schemes are investigated in terms of RC delay. An inverter ring oscillator with a three-line three-section RC interconnect model is used for this study. It is shown that a dual damascene Cu interconnect with lower k-value anti-diffusion layer such as SiBON (k=3.9) can out-perform Al…
The pressure wave propagation method has previously been used to obtain a direct measurement of space charge injection into an epoxy resin at high divergent electric fields. Here we report the results of a series of experiments designed to investigate the extraction dynamics of such injected charge by following the de…
In the paper a possibility to determine the iron losses building factor is proposed. The used methodology, which has to be intended as a first approach to the problem, is based on a full experimental approach. Four wound cores, having the same geometrical dimensions, have been assembled as the addition of different nu…
Partial Discharges (PD) cause the degradation of insulating materials and govern the lifetime of high-voltage power apparatus and cables. Therefore, it is important to understand the PD behaviors in the aging process. In this paper, partial discharges and their current shapes of low-density polyethylene (LDPE) with a…
Topside metal helps spread the heat dissipated by HBTs and reduces both the thermal resistance at a given temperature, and its temperature dependence. In this paper we describe new methods for including topside metal cooling effects in both an electrical method of extracting HBT temperature and a geometry-based method…