Materials Literature
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Triple molybdates of the compositions Rb 5 LnHf(MoO 4 ) 6 (5:1:2) and Rb 2 LnHf 2 (MoO 4 ) 6.5 (2:1:4), Ln = Ce-Lu, were prepared by solid-phase reactions. The temperature dependence of the electrical conductivity of the compounds Rb 5 LnHf(MoO 4 ) 6 (5:1:2) at 200–500°C was studied.
We present preliminary studies of magnetic and transport properties of Ge 1-x-y Sn x Mn y Te mixed crystals with 0.091 x 0.105 and 0.012 y 0.115. Qualitative analysis of our experimental results showed the appearance of a spin-glass phase at T < 50 K. The transport characterization (resistivity and Hall effect measure…
We have recently been able to grow single-walled carbon nanotubes by purely thermal chemical vapour deposition (CVD) at temperatures as low as 400 degrees C. This has been achieved by separating the catalyst pre-treatment step from the growth step. In the pre-treatment step, a thin film catalyst is re-arranged into a…
Corona discharge is being detected by UV imaging detection technology at home and abroad in recent years. This technology is used in the corona tests of bundled conductors in this paper. In order to further research the corona characteristic, optimize geometry parameters and diameter of sub-conductor, and increase cor…
This paper presents a novel three-phase laminated-core variable inductor made for the purpose of voltage stabilization in electric power systems. The proposed variable inductor has three-phase secondary ac windings together in one laminated-core to reduce the size and weight in comparison with the other single-phase o…
The magnetic properties of La0.7Ca0.3MnO3(LCMO) manganite thin films were studied with magnetometry and ferromagnetic resonance as a function of film thickness. They maintain the colossal magnetoresistance behavior with a pronounced metal-insulator transition around 150-200 K, except for the very thinnest films studie…
A thin coating with an extended reaction (see Acoust. Phys. 53 , 535 (2007)) is used to reduce the reflection and scattering of waves from an infinite cylinder. The coating is shown to be more efficient compared to conventional coatings.
Abstract Cobalt nanoparticles loaded on an activated carbon catalytically excavated the activated carbon when it was heat-treated in a 1 atm stream of a mixture of hydrogen and argon gases at high temperature. The BET surface area of the activated carbon decreased from 2210 to 1750 m2 g−1, and the mesopore volume incr…
Optical imaging using unspecific contrast agents as well as targeted and disease-specific agents play a vital role in preclinical research. Moreover, optical imaging is on the verge of establishing itself as a clinically relevant imaging modality. Also in-vitro diagnostical procedures rely to a large degree on optical…
Two new marine diatom species, Cocconeis melchioroides and C. dallmannii are described from Potter Cove, King George Island, Antarctica. Detailed descriptions are given based on LM and SEM images for both species and compared with the only known morphologically related taxon, Cocconeis melchiori Frenguelli and Orlando…
The field emission (FE) characteristics of indium oxide (In2O3)-coated single-walled carbon nanotubes (SWCNTs) were studied. Scanning electron microscopy, x-ray diffractometer, and UV/visible spectroscopy confirmed that In2O3 exists as a polycrystalline cubic bixbyite structure on the surface of SWCNTs. The turn-on fi…
In the Mask D2I project at ASET, the authors designed a novel electron beam exposure system having the concepts of multicolumn cell (MCC), character projection, and variable shaped beam to improve the throughput of electron beam exposure systems. They presented the electron optical structure of an individual column ce…
The ultimate conductometric sensor for ferromagnetic activity of nanoscale magnetic materials could be a single carbon nanotube. We show that the electrical conductance of an individual carbon nanotube is sensitive to magnetic transitions of nanoscale magnets embedded inside it. To establish this, multiwall carbon nan…
In this paper, the authors investigated constraints on the quality of topographic features needed for graphoepitaxial assembly of cylinder forming poly(styrene-b-methyl methacrylate) (PS-b-PMMA) thin films, showing the impact of trench width roughness (TWR) on feature size uniformity and defect formation. Topographica…
Ferro-resonance is a nonlinear dynamic electrical phenomenon in a power system. It may occur in ungrounded three-phase lines at transformer banks on no-load due to malfunctioning of switching devices (one pole closing at first). A hysteresis model is developed with core-type transformers and power capacitors simulatin…
The stability of open edged multi-walled carbon nanotubes has been investigated by using in situ high resolution transmission electron microscopy at elevated temperatures. Formation of inter-shell structures was experimentally observed for the first time and attributed to a robust interaction between adjacent concentr…
Magnetic properties as a function of film thickness (2–55 nm) for magnetite (Fe$_{3}$O$_{4}$) thin films grown on MgO (100) substrates show that the small thickness films ($\leq 5$nm) are ferromagnetic and possess magnetization values which are much greater than that of bulk Fe$_{3}$O$_{4}$. The inverse thickness depe…
The specifics of the cross-linking route of tris(1-(dichloro(methyl)silyl)ethyl)borane to form a preceramic polymer suitable for the subsequent synthesis of Si−B−C−O ceramics has significant influence on the local phase composition and the microstructural features of the resulting samples after their ceramization and…
The E values calculated using the Kissinger and Flynn-Wall-Ozawa equations and integral isoconversional non-linear equations were used to check the validity of activation energy by a single non-isothermal DSC curve.
A new pregnane steroid with an unusual formyl group (1) was isolated from the stems of Caralluma umbellata, together with three known steroid compounds. The structure of 1 was elucidated on the basis of spectral evidence including 2D NMR studies.