Some comments on superconductivity in diborides
Short discussion trying to explain, why superconductivity revealed for some diborides is not always confirmed in experiments of different research groups.
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Comment on ''Photonic Band Gaps: Noncommuting limit and the 'Acoustic Band'''
This comment concerns the homogenization of 2D dielectric photonic crystals, and the fact that the limits $k\to 0$ ($k$ is the Bloch vector) and $ε\to +\infty $ do not commute for $p$-polarized waves
Effect of Crystal Structure to Resonant X-Ray Scattering on YTiO3
We investigate the mechanism of the resonant X-ray scattering on the Ti $K$ edge region of YTiO$_3$ using the band structure calculation combined with the local density approximation. A large intensity is obtained for the orbital superlattice spots. The calculated spectra consist of several peaks as a function of phot…
Control of Coherent Acoustic Phonons
Using sub-picosecond optical pump-probe techniques, coherent zone-folded longitudinal acoustic phonons (ZFLAPs) were generated and controlled in an InGaN multiple quantum well structure. A one-pump, one-probe differential transmission technique revealed that carriers injected near the barrier band edge were quickly ca…
Changes in Biomolecular Conformation Seen by Small Angle X-ray Scattering
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChanges in Biomolecular Conformation Seen by Small Angle X-ray ScatteringSebastian DoniachView Author Information Departments of Applied Physics and Physics, Stanford University, Stanford California 94305 Cite this: Chem. Rev. 2001, 101, 6, 1763–1778Publication Date (Web):Ap…
Dynamics of laser-induced cavitation bubbles near elastic boundaries: influence of the elastic modulus
The interaction of a laser-induced cavitation bubble with an elastic boundary is investigated experimentally by high-speed photography and acoustic measurements. The elastic material consists of a polyacrylamide (PAA) gel whose elastic properties can be controlled by modifying the water content of the sample. The elas…
Dynamics of laser-induced cavitation bubbles near an elastic boundary
The interaction of a laser-induced cavitation bubble with an elastic boundary and its dependence on the distance between bubble and boundary are investigated experimentally. The elastic boundary consists of a transparent polyacrylamide (PAA) gel with 80% water concentration with elastic modulus E = 0.25 MPa. At this E…
Effects of different post-crystallization soaking conditions on the diffraction of Mtcp1 crystals
The crystal structure of human Mtcp1 was determined at 2 A resolution after the X-ray diffraction limit was improved by post-crystallization soaking in 2.0 M ammonium sulfate for 1-5 months. The effects of varying the ammonium sulfate concentration and addition of polyethylene glycol to the soaking solution were exami…
Effect of leaching and clay content on carbon and nitrogen mineralisation in maize and pasture soils
We conducted a 7-week laboratory incubation experiment to evaluate the effect of leaching on net C and N mineralisation in soils. The soils were collected from adjacent fields of long-term pasture and maize, where each field contained an Inceptisol and an Andisol. The concentration of clay mineral was 200 g/kg halloys…
Monolayer Oscillation Observed by an Oblique-Incidence Reflectance Difference Technique for the Epitaxial Growth of Oxides
We report the optical oscillations with monolayer periodicity observed by an oblique-incidence reflectance difference (OIRD) technique on the epitaxial growth of Nb-doped SrTiO 3 on SrTiO 3 substrate. The periodicity was verified by the simultaneously measured reflection high-energy electron diffraction intensity osci…
Bridged Dinitrogen Complexes of Iron and Chromium Porphyrins
Reactions of [M(OEP)(OTf)] (M = Fe or Cr, OEP = octaethylporphyrinate, OTf = triflate) with [Re(N2)(PMe2Ph)4Cl] afford [(OEP)M(N2)Re(PMe2Ph)4Cl][OTf]. The structure of the heterometallic Fe/Re dinitrogen complex has been established by X-ray crystallography.
Mixed cation effect in chalcogenide glasses Rb 2 S − A g 2 S − G e S 2
Chalcogenide glasses with composition $0.5[(1\ensuremath{-}x){\mathrm{Rb}}_{2}\mathrm{S}\ensuremath{-}x{\mathrm{Ag}}_{2}{\mathrm{S}]\ensuremath{-}0.5\mathrm{GeS}}_{2},$ $0<~x<~1,$ were prepared and their ion transport properties and glass transition temperatures were found to show clear manifestations of the mix…
Effects of oxygen nonstoichiometry on the stability of antiferromagnetic phases ofCuFeO2+δsingle crystals
Effects of oxygen nonstoichiometry on stabilities of the antiferromagnetic (AF) phases of ${\mathrm{CuFeO}}_{2}$ with a delafossite-type structure have been investigated. Temperature dependence of the magnetic susceptibility between 5 and 300 K in 0.1 T parallel to the c axis, and magnetic-field dependence of the magn…
Metamagnetism of the First Cyano-Bridged Two-Dimensional Brick-Wall-like 4f−3d Array
[Gd(DMF)2(H2O)3Cr(CN)6]·H2O is the first lanthanide−transition metal array with a flat two-dimensional brick-wall-like molecular structure. The antiferromagnetic coupling between the adjacent Gd−Cr ions leads to intralayer ferrimagnetic correlation due to the noncancellation of spins. The long-range magnetic ordering…
Soil factors affecting the availability of potassium to plants for Western Australian soils: a glasshouse study
A glasshouse experiment was conducted with 41 surface and 8 subsurface soils to measure their potassium (K) supply capacities and K depletion of soils by ryegrass growth for 260 days and harvesting at ~40-day intervals. Dry matter yield ranged from 0.22 g to 25.4 g/kg soil, cumulative K uptake ranged from 0.006 to 1.4…
Europium Palladium Hydrides
The first fully structurally characterized ternary europium palladium hydrides (deuterides) are reported. The most Eu rich compound is Eu(2)PdD(4). Its beta-K(2)SO(4) type structure (space group Pnma, a = 749.47(1) pm, b = 543.34(1) pm, c = 947.91(1) pm, Z = 4) contains tetrahedral 18-electron [PdD(4)](4)(-) complex a…
Structure of the macrocycle thiostrepton solved using the anomalous dispersion contribution of sulfur
The structure of a tetragonal crystal form of thiostrepton has been solved using the anomalous dispersive effects of five S atoms from high-redundancy data collected to 1.33 A resolution at the Cu Kalpha wavelength. Data measured to 1.02 A resolution with a synchrotron source were used for refinement. Details of the m…
On the routine use of soft X-rays in macromolecular crystallography
A diffraction data set has been collected from a blood coagulation factor XIII-Ca(2+) complex crystal at the X-ray diffraction beamline of the ELETTRA synchrotron (Trieste, Italy) at a wavelength of 2.6 A. The data collection could be carried out using the beamline as is, without making any time-consuming changes to t…
Elucidation of Structure and Location of V(IV) Ions in Heteropolyacid Catalysts H4PVMo11O40as Studied by Hyperfine Sublevel Correlation Spectroscopy and Pulsed Electron Nuclear Double Resonance at W- and X-Band Frequencies
Electron spin resonance, pulsed electron nuclear double resonance (ENDOR) spectroscopy at W- and X-band frequencies, and hyperfine sublevel correlation (HYSCORE) spectroscopy have been employed to determine the location of the V(IV) ions in H4PVMo11O40 heteropolyacid catalysts. In these materials the heteropolyanions…
Bonding, Organization, and Dynamical Growth Behavior of Tripeptides on a Defined Metal Surface: Tri-l-alanine and Tri-l-leucine on Cu{110}
The behavior of the tripeptides tri- l -alanine and tri- l -leucine, deposited under ultrahigh vacuum conditions onto a clean Cu{110} surface, has been studied using reflection−absorption infrared spectroscopy and low-energy electron diffraction. Both peptides remain intact upon landing on the Cu{110}surface and are p…