Materials Literature
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We study the effects of spin orbit interactions on the low energy electronic structure of a single plane of graphene. We find that in an experimentally accessible low temperature regime the symmetry allowed spin orbit potential converts graphene from an ideal two-dimensional semimetallic state to a quantum spin Hall i…
Three Eu(III) luminescent compounds were separately entrapped in a xerogel porous silica matrix and finely ground particles of it were deposited on a glass support with polyvinylacetate (PVAc) as a binder to build a thin film sensor. These 3 devices were immersed in aqueous solutions of Cu(II) and the content of this…
The coalescence frequency in emulsions containing droplets with a low viscosity (viscosity ratio approximately 0.005) in simple shear flow has been investigated experimentally at several volume fractions of the dispersed phase (2%-14%) and several values of the shear rate (0.1-10 s(-1)). The evolution of the size dist…
Silver nanoparticle layers were fabricated using spin coating and rapid thermal processing of poly(vinyl)-N-pyrrolidone/Ag nanoparticle composite thin films on glass. Fast thermal degradation of the polymeric matrix at 420°C results in spontaneous aggregation of Ag nanoparticles, accompanied by strong enhancement and…
Yeast NAD(+)-specific isocitrate dehydrogenase (IDH) is an allosterically regulated tricarboxylic acid cycle enzyme that has been shown to bind specifically and with high affinity to 5'-untranslated regions of yeast mitochondrial mRNAs. The absence of IDH has been shown to result in reduced expression of mitochondrial…
The crystallization process from supercooled melt results in the formation of nanosize nuclei in the earlier stage (induction period) through subsequent attachment or detachment of repeating unit to nuclei. The size distribution of nucleus f(N(j),t) in the induction period of nucleation process from the melts has not…
An analytical approach was proposed for simultaneously determining an inelastic mean-free path (IMFP) and a surface excitation parameter (SEP) with absolute units by the analysis of an absolute experimental reflection electron energy loss spectrum. The IMFPs and SEPs in Ni were deduced for electrons of 300 to 3000 eV.…
Abstract Differential scanning calorimetry (DSC) has been performed at different heating rates under non‐isothermal conditions to study the crystallization kinetics of glassy Se 100– x Sb x (2 ≤ x ≤ 10) alloys. The crystallization kinetics have been studied using four different methods of analysis of the non‐isotherma…
The high-temperature structures and phase transitions of the cation-ordered manganite perovskites $\mathrm{Tb}\mathrm{Ba}{\mathrm{Mn}}_{2}{\mathrm{O}}_{6}$ and $\mathrm{Y}\mathrm{Ba}{\mathrm{Mn}}_{2}{\mathrm{O}}_{6}$ have been studied by powder neutron diffraction and differential scanning calorimetry. $\mathrm{Tb}\ma…
To investigate the buckling behavior of thin and relatively thick cylindrical shape-memory shells, uniaxial compression tests are performed at a 295K initial temperature, using the CEAM/UCSD’s modified split Hopkinson bar systems and an Instron hydraulic testing machine. The quasi-static buckling response of the shell…
We investigated ferromagnetic domain structures on nanometer to micrometer scale for single crystals of a layered ferromagnet, La(2-2x)Sr(1+2x)Mn2O7 (0.32 < or = x < or = 0.40), as functions of x and temperature by means of Lorentz electron microscopy. We have succeeded in observing the evolution of magnetic ripple st…
Broadband dielectric measurements for anhydrous tripropylene glycol (3PG) and 96, 92, 84, 80, 74, 71, and 68 wt % 3PG-water mixtures are performed in the frequency range of 10(-2)-10(7) Hz and in the temperature range of 123-243 K. We examined the effect of adding water into anhydrous 3PG on relaxation dynamics. Apart…
Small-angle light scattering is used to assess the dispersion behavior of vapor-grown carbon nanofibers suspended in water. These data provide the first insights into the mechanism by which surface treatment promotes dispersion. Both acid-treated and untreated nanofibers exhibit hierarchical morphology consisting of s…
The aging properties of a simple free-energy landscape model for the primary relaxation in supercooled liquids are investigated. The intermediate scattering function and the rotational correlation functions are calculated for the generic situation of a quench from a high temperature to below the glass transition tempe…
When slender magnetostrictive strips that are obliquely bonded on the surface of a pipe are subjected to a time-varying magnetic field, the strips deform mechanically because of the magnetostrictive effect and in turn, ultrasonic torsional waves are generated in the pipe. If the magnetic flux density in the strips can…
OBJECTIVE: The aim of this study was to evaluate the characteristics of an ultrasmall superparamagnetic iron oxides (USPIO) agent in patients with brain tumors and to correlate changes on MRI with histopathologic data collected systematically in all patients. SUBJECTS AND METHODS: Nine patients with brain tumors were…
Abstract A new discrete supramolecular pseudo‐helicate has been obtained from a saturated heterotopic methylbipyrazyl–methylbipyridyl ligand strand and NiCl 2 . The X‐ray structure of the dinuclear complex shows the 2‐oxapropylene bridge oxygen atoms are engaged in coordination to the octahedral metal centre and a sel…
This paper describes a technique for measuring the sheet resistance of thin metallic films at both 130 GHz and dc (0 Hz). The high-frequency measurements were made using dielectric waveguides, and the conventional four-point probe was used for the lower frequency. The two values of the sheet resistance for each sample…
We report the direct observation, using freeze-fracture transmission electron microscopy, of topological melting in a lyotropic system in the vicinity of a smectic-cholesteric (N*) phase transition. The proliferation of dislocations leads to at least one, and possibly two intermediate phases, characterised by orientat…
Melt processing of poly(L-lactide) (PLLA) and poly(methyl methacrylate) (PMMA) was conducted over a targeted range of compositions with PLLAs of 118 and 316 kDa in molecular mass to identify morphologies and the phase relationships in these blends. These blends are of interest for use in biomaterials and the morpholog…