Die Hydridosilicat-Anionen [ArSiH4]− und [SiH6]2− werden als Liganden in den Si-H-σ-Dirutheniumkomplexen [{(PhBPPh3)Ru}2(μ-Cl)(μ-η3,η3-H4SiAr)] (Ar=2-MeOC6H4, Mes, Ph) bzw. [{(PhBPPh3)Ru}2(μ-η4,η4-H6Si)] stabilisiert. Diese Komplexe entstehen unter milden Bedingungen und konnten durch Einkristall-Röntgenstrukturanalyse (siehe Bild für den [SiH6]2−-Komplex), NMR- und IR-Spektroskopie sowie Rechnungen charakterisiert werden. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Postconcussive symptoms after mild traumatic brain injury (MTBI) may be exacerbated by anxiety associated with posttraumatic stress. The aim of this study was to investigate the relationship between postconcussive symptoms and posttraumatic stress disorder (PTSD) in an MTBI population. Survivors of motor vehicle accidents who either sustained an MTBI (N = 46) or no TBI (N = 59) were assessed 6 months posttrauma for PTSD and postconcussive symptoms. Postconcussive symptoms were more evident in MTBI patients with PTSD than those without PTSD, and in MTBI patients than non-TBI patients. Further, postconcussive symptoms were significantly correlated with PTSD symptoms. These findings indicate that postconcussive symptoms may be mediated by an interaction of neurological and psychological factors after MTBI.
In this paper, the deterministic prediction of damage via damage function analysis (DFA), which provides a robust technology for estimating the damage function at future times, is described. General analytical expressions for calculating the damage functions that can be used with arbitrary dependencies of pit nucleation rate, pit growth rate, and repassivation rate on the system parameters have been obtained. The application of DFA to prediction of pitting damage is illustrated by reference to the pitting corrosion of iron in neutral chloride-containing solutions.
Antenna arrays on conventional ground planes present different deficiencies. For compact platforms, the propagation of RF surface currents results in lost power, radiation from the edges and other discontinuities. It also contributes to the strong coupling and causes blind angles and multipath interference. By building radio isolation into the ground plane of phased array antenna structures, it is possible to reduce these different disturbances. This isolation may be achieved by using corrugated surfaces. In this case, DC currents are conducted but not AC currents. Based on the previous work done on PBG structure, a new kind of surface called High Impedance Ground Plane can be used. This kind of ground plane presents the same characteristics are corrugated surfaces in all the directions. Moreover the thickness must no longer be one fourth of the wavelength and can be even much smaller. These ground planes have been applied antenna array in order to reduce the disturbances created on compact platforms. Phase measurements of two-dipole array clearly shows this reduction.
Abstract Corrosion fatigue crack growth rates of a quenched and tempered Type 403 stainless steel have been measured in concentrated sodium hydroxide and sodium chloride solutions with and without the addition of sodium silicate and sodium phosphate as potential inhibitors using compact tension specimens (CTS). All tests were performed at 100°C with a sinusoidal loading wave form at R=0.5 and at frequencies of 0.1, 1, and 10 Hz. Tests in air were also conducted to obtain the base line data for fatigue crack growth rates (FCG). At open circuit potentials, corrosion fatigue crack propagation rates were highest in concentrated sodium chloride solution. The environmental enhancement of fatigue crack growth became more evident as the frequency was decreased in both 10 mol kg−1 (m) sodium hydroxide and saturated (6.6 mol kg−1) sodium chloride solutions. Both sodium phosphate and sodium silicate at the concentrations used in this work showed no beneficial effect on the corrosion fatigue crack growth rates for Type 403 stainless steel in 10 mol kg−1 NaOH solution. However, the addition of sodium silicate and sodium phosphate showed inhibiting effects in 6 mol kg−1 sodium chloride solution. The inhibiting actions of these compounds were strongly concentration dependent. A crack growth rate equivalent to that in air was found with the addition of 0.5m Na3PO4 or 0.5m Na2SiO3.
Terminal group 3 methylidene complexes are generated by thermolysis of monoanionic PNP-supported scandium and yttrium dialkyl complexes. The reaction mechanism has been probed by deuterium-labeling experiments and DFT calculations. Abstraction of a γ-hydrogen from one alkyl group by the other affords a metallacyclobutane that undergoes [2 + 2] cycloreversion, analogous to a key step in the olefin metathesis reaction, to generate a methylidene complex and isobutene. The resulting methylidene complex dimerizes in the case of scandium and decomposes to a mixture of products in the case of yttrium.
