Materials Literature
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A 3D magnetostatics computer code optimized for Undulators and Wigglers is described. The code uses a boundary integral method and makes extensive use of analytical expressions for the field and field integrals along a straight line. The code outperforms currently available finite element packages in the area of simpl…
Methods for introducing new magnetic, optical, electronic, photophysical, or photochemical properties to semiconductor nanocrystals are attracting intense applications-oriented interest. In this communication, we report the preparation and electronic absorption spectroscopy of colloidal ZnO DMS-QDs. Our synthetic proc…
A synthesis of ordered biphenylene-bridged mesoporous material with a crystal-like periodic pore wall structure is reported.
A general peptide design is presented that links the pH-dependent intramolecular folding of beta-hairpin peptides to their propensity to self-assemble, affording hydrogels rich in beta-sheet. Chemical responsiveness has been specifically engineered into the material by linking intramolecular folding to changes in solu…
Carbon nanotubes can be functionalized via amidation and esterification of the nanotube-bound carboxylic acids. The solubility of these functionalized carbon nanotubes makes it possible to characterize and study the properties of carbon nanotubes using solution-based techniques. Representative results concerning the s…
The concept of global vacuum pressure impregnation has been in existence for many years and thousands of motors and generators have been manufactured by this process. Over the past 20 years the unit size of machines manufactured by this process has steadily increased until it is now common for generators having output…
The polyetherimide is an amorphous thermoplastic resin with a high glass transition temperature. It is characterised by high heat resistance and mechanical properties which make it suitable for industrial application. Two different polyetherimide (varying by the chemical formula) are investigated here, in term of thei…
Several different joint assemblies were evaluated in support of a manufacturing technology for diffusion bonding a beryllium armor tile to a copper alloy heat sink for fusion reactor applications. Because beryllium reacts with all but a few elements to form intermetallic compounds, this study considered several differ…
Thin films of ZnO were deposited by chemical bath deposition. The "as grown" films are amorphous or polycrystalline depending upon the chemical composition of the aqueous solution and the temperature used for their deposition. After a thermal annealing at temperatures above 300/spl deg/C, the films undergo a chemical…
This paper describes the investigation results of DC leakage currents and space charge distributions in the cable insulation performed to clarify the mechanism of the DC leakage current peak in 6.6 kV XLPE cables. These measurements were carried out at various amounts of residual by-product of crosslinking reaction. T…
This work presents a study of the sensitivity of some parameters in magnetic components and their influence on the value of their parasitics. The influence of the insulator thickness, the effect of the air gap, the window height and the variation of the value of the capacitive effects as a consequence of the coil-form…
The title compound, caesium aluminium dimolybdate(VI), CsAl(MoO4)2, belongs to the glaserite type family of double molybdates and tungstates. The crystal structure was studied by in situ X-ray single-crystal and powder diffraction at room temperature. The temperature dependence of the lattice parameters at low tempera…
A study of several configurations used to construct low-profile transformers is presented. Finite-element analysis is used to analyze the behavior of transformer current at high frequency and determine an appropriate winding configuration with low AC-resistance and leakage inductance. It is demonstrated that the foil…
A highly-reliable ferroelectric memory (FeRAM) which ensures retention of data written at a low voltage of 2.5 V and humidity resistance for 10 years under a high temperature of 70/spl deg/C has been successfully developed for the first time. These excellent characteristics have been attained by a newly developed ferr…
Electrical breakdown in high voltage cable insulation is correlated with the presence of a space charge. Beside experimental characterisation, physical and phenomenological modelling, an alternative approach is proposed, based on recent developments in computational chemistry, which can give information on each indivi…
The paper discusses the role and the significance of the radionuclide thermoelectric generators in space power researches while using them as reliable long-life service autonomous sources of power and heat supply. There are considered approaches connected with the RTG design and the provision them with the radiation s…
The reliability of the power supply can be significantly improved by modifying the electric motors' re-acceleration scheme. It will mitigate the affect of lengthy and simultaneous acceleration by staggering the high inrush current demand. Transient simulations were performed at an integrated petrochemical facility to…
This paper presents a shape memory alloy (SMA) actuator aimed to be integrated in the phalanx of a dexterous micro-gripper. Its original design mechanically decouples motion transmission from force transmission. After a brief discussion on the operating principles of the actuator, the kinematics of the mechanism and i…
HVDC components for both energy (HVDC submarine cables) and non-energy (X-ray equipment, television screens, travelling wave tubes) applications can successfully be tested for partial discharges (PD). Contrary to the situation for ac equipment that is used for the electrical energy supply (IEC270), no detailed PD test…
Increased switching frequencies in magnetic components have resulted in renewed attention to the problem of proximity effect losses in layered transformer windings. The ideal situation is to design at the point of minimum AC winding resistance. This paper provides a unified approach which gives exact AC resistance for…