Materials Literature
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Electronic properties of proposed new families of carbon single walled nanotubes are investigated. These nanotubes, called graphynes, result from the elongation of covalent interconnections of graphite-based nanotubes by the introduction of yne groups. Analogous to ordinary nanotubes, armchair, zigzag and chiral graph…
The results of dc magnetization, heat capacity, electrical resistivity (rho) and magnetoresistance measurements are reported in detail for the compounds, RCuAs2 for R= Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Er, crystallizing in HfCuSi2-type tetragonal structure, with the aim of bringing out anomalies among 'normal' (that is,…
We show that a simple first-principles correction based on the difference between the singlet-triplet CO excitation energy values obtained by DFT and high-level quantum chemistry methods yields accurate CO adsorption properties on a variety of metal surfaces. We demonstrate a linear relationship between the CO adsorpt…
We use an atomic force microscope (AFM) tip to locally probe the electronic properties of semiconducting carbon nanotube transistors. A gold-coated AFM tip serves as a voltage or current probe in three-probe measurement setup. Using the tip as a movable current probe, we investigate the scaling of the device propertie…
Population genetic structure was determined for the planktonic diatom Ditylum brightwellii (West) Grunow in two connected estuaries—Puget Sound and the Strait of Juan de Fuca (WA, USA). Three genetically distinct populations were detected that were characterized by different microsatellite allele distributions and uni…
The synthesis of layered ferrite-lead titanate zirconate (PZT) and lanthanum nanganite-PZT and the observation of giant magneto-electric interactions are discussed. The ferrites used in our studies included pure and Zn substituted cobalt-, nickel- and lithium ferrites. Ferromagnetic manganites used included both calci…
The physics of manganites appears to be dominated by phase competition among ferromagnetic metallic and charge-ordered antiferromagnetic insulating states. Previous investigations (Burgy {\it et al.}, Phys. Rev. Lett. {\bf 87}, 277202 (2001)) have shown that quenched disorder is important to smear the first-order tran…
The photoluminescence center ${D}_{\mathrm{II}}$ is a persistent intrinsic defect which is common in all SiC polytypes. Its fingerprints are the characteristic phonon replicas in luminescence spectra. We perform ab initio calculations of vibrational spectra for various defect complexes and find that carbon antisite cl…
Efficient determination of protein crystal structures requires automated x-ray data analysis. Here, we describe the expert system ELVES and its use to determine automatically the structure of a 12-kDa protein. Multiwavelength anomalous diffraction analysis of a selenomethionyl derivative was used to image the Asn-16-A…
Nylon-6−organoclay nanocomposites were prepared by melt processing via twin-screw extrusion for the purpose of comparing the effect of the number alkyl groups attached to the nitrogen of the organic modifier on the level of organoclay exfoliation. Wide-angle X-ray scattering and transmission electron microscopy techni…
Thin films of tungsten-doped vanadium(IV) oxide were prepared on glass substrates from the atmospheric pressure chemical vapor deposition of vanadium(IV) chloride, tungsten(VI) ethoxide, and water at 500−600 °C. The films were characterized by Raman microscopy, glancing angle X-ray diffraction (GAXRD), X-ray photoelec…
We report on the coupling between ferroelectric and magnetic order parameters in a nanostructured BaTiO3-CoFe2O4 ferroelectromagnet. This facilitates the interconversion of energies stored in electric and magnetic fields and plays an important role in many devices, including transducers, field sensors, etc. Such nanos…
Hypersensitivity Injection-site extravasation (1999): Fleming A+, J Hand Surg [Br] 24, 390 Injection-site inflammation Injection-site necrosis Injection-site reactions (sic) (3-20%) Injection-site ulceration Mucositis (1999): Ormrod D+, Drugs Aging 15, 389 Myalgia (1995): Fountzilas G+, Med Pediatr Oncol 24, 23 (55%)…
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Permanent magnet rings are presented, which exploit the image effect in the surrounding circular iron shields. The theory is given for a general permanent ring when the magnetization orientation phi at each coordinate angle psi changes by phi =(n+1)psi, where n is a positive or negative integer. For the uniformly magn…
Abstract A novel sugar‐containing poly(ornithine) dendrimer is synthesized for possible antigen delivery and related applications. The dendrimer contains an ornithine dendron as interior scaffolding and oligosaccharides on the periphery, which provide an attachment site for a peptide antigen. Maltose or lactose is bou…
We have carried out ac conductivity measurements on different alkali tellurite and silver halide containing glasses exhibiting high electronic polarizabilities. The analysis of the conductivity spectra provides strong evidence that the ionic site energy distributions in these glasses are distinct from those in convent…
We study both theoretically and experimentally the structure of the doped silicon clathrate II ${\mathrm{Na}}_{x}{\mathrm{Si}}_{34}.$ We find that contrary to published works, the sodium atoms do not retain the ${T}_{d}$ symmetry inside the ${\mathrm{Si}}_{28}$ cages and move about 1 \AA{} away from the center of the…
We present a study of the spin dynamics of the magnetic dimer $[\mathrm{Fe}(\mathrm{OMe})(\mathrm{dpm}{)}_{2}{]}_{2},$ using M\"ossbauer spectroscopy. In this cluster, the two iron(III) ions are antiferromagnetically coupled so that the dimer presents a $S=0$ spin ground state. Spin multiplets with values of S ranging…
The Gd(III) complexes of the two dimeric ligands [en(DO3A)2] {N,N'-bis[1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecan-10-yl-methylcarbonyl]-N,N'-ethylenediamine} and [pi(DTTA)2]8- [bisdiethylenetriaminepentaacetic acid (trans-1,2-cyclohexanediamine)] were synthesized and characterized. The 17O NMR chemical sh…