Materials Literature
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After decades of research in insulation systems, little has been published in the area of analyzing the graph of resistance versus time. Plotting the Insulation Resistance versus Time, gives a graph which may be referred to as an “Insulation Resistance Profile” or IRP. In addition to the standard Insulation Resistance…
Power cables as one of main components of power networks, play an important role in electric power transmission between different zones. Because of probable incidence of water tree phenomena, air cavity and also humidity in electric insulators, increase in electric field happens locally and can lead to breakdown in in…
The eggs of Aedes scapularis analyzed by scanning electron microscopy are black and elliptical in outline, measuring approximately 620.4 +/- 16.74 microm long and 163.7 +/- 16.90 microm (n = 10) wide, with an egg index (length/width ratio) of 3.79. The anterior extremity tapered abruptly from a width of 51.6 microm, w…
An analytic expression for π and π* electronic structure of graphene is derived within the tight-binding approximation. Including up to fifth-nearest neighbors, the tight-binding description of electronic dispersion quite accurately reproduces the first-principle calculation result over the entire Brillouin zone. The…
We report that porous anodic alumina (aluminum oxide: Al2O3) (PAA) thin films directly grown on Si show clear oscillations in their photoluminescence (PL) spectra which are ascribed to PL-induced interferences within the Fabry–Pérot optical cavity formed by the PAA film on Si, that involve the air/oxide and oxide/Si i…
Using grand-canonical Monte Carlo simulations we investigate the impact of charged walls on the crystallization properties of charged colloidal suspensions confined between these walls. The investigations are based on an effective model focussing on the colloids alone. Our results demonstrate that the fluid-wall inter…
An analysis of compression isotherms of floating layers of copper tetra-tert-butylphthalocyanine ( CuPctBu4 ) and copper tetrabenzotriazaporphyrine, obtained at varied initial conditions, is carried out. The structure of layers is determined by three methods: the traditional one (direct estimation of area per molecule…
Ultracapacitors have numerous advantages including remarkably high energy density as compared with conventional capacitors, long life cycle, temperature stability, and require no maintenance, which make them a good candidate to replace batteries as energy storage devices in renewable energy applications. However, ultr…
Combining solid oxide fuel cell and gas turbine (SOFC/GT) system is a promising concept for future clean and efficient power generation. An SOFC/GT system exploits the complementary features of the two power plants, where the GT recuperates the energy in the SOFC exhaust stream and thereby boosting the overall system…
The effect of the oxidation temperature of UO2 pellets on the powder properties of oxidized U3O8 powders has been investigated. The powder morphology, crystalline size, and BET surface area of recycled U3O8 could be modified by controlling the oxidation temperature of the UO2 pellets. Recycled U3O8 powder with a high…
This study consists of elaborating and characterizing some nanometric materials in basic of rare-earth oxides by the soft chemistry technique. the first step of this work consists of synthesizing nanometric pure ceria by sol-gel process. In the second one, the Bismuth doped ceria by co-precipitation method was realize…
To study the chemical constituents of Saxifraga stolonifera (L.) Meeb., chromatographic techniques were applied to separate and purify the compounds, and their structures were confirmed on the basis of physicochemical properties and spectral data. Ten compounds were isolated and identified as 5-O-methylnorbergenin (1)…
Semiconductor quantum dots (QDs) are tiny light-emitting particles that have emerged as a new class of fluorescent labels for biology and medicine. Compared with traditional fluorescent probes, QDs have unique optical and electronic properties such as size-tuneable light emission, narrow and symmetric emission spectra…
In order to study the influence of temperature on the developing processes of surface discharges in oil-paper insulation, a discharge test assembly is established to simulate the surface discharges in transformers. It consists of a surface discharge model, a test rig and a PD detection system. Long-term laboratory tes…
For PD measurements in unscreened laboratories, factory environments, or even during on-site conditions, the measuring result is overlaid and sometimes dominated by numerous disturbances. As common-wave interferences such as radio signals, e.g., can easily be suppressed by frequency-domain filters, pulse-like disturba…
An experimental setup for dielectric testing of insulating liquids in the temperature range from -60 °C to +250 °C has been built. The system uses point-plane geometry, a sensitive differential charge measurement technique, a computer controlled temperature regulator, a photomultiplier and a pulse generator with a fas…
Gold nanorods have strong surface plasmon band at near-infrared light region, and are used as a photothermal converter. Since the near-infrared light penetrates into tissues deeply, it has been expected as a contrast agent for near infrared light bioimaging, a photosensitizer for photothermal therapy, and functional d…
Hydrocarbons, carbon monoxide, and other polluting emissions produced by diesel engines are usually much lower than those from gasoline engines. However, higher combustion temperature in diesel engines cause substantially larger percentage of nitrogen oxides (NOx) emissions. Selective catalyst reduction (SCR) is a wel…
Abstract In recent years, significant progress in high pressure macromolecular crystallography has been observed. It can be attributed both to the developments in experimental techniques, as well as to recognition of importance of high pressure protein studies in biochemistry and biophysics. The number of protein stru…
Processing of mesoporous films is a critical step that needs a careful control and comprehension of the chemical−physical phenomena that governs evaporation induced self-assembly. We have used time-resolved infrared spectroscopy to study two of the main stages of self-assembly in titania films: evaporation and postdep…