Ab initio and density functional calculations predict that intramolecular homolytic substitution reactions of oxyacyl radicals at the selenium atom in ω-alkylseleno-substituted radicals proceed via mechanisms that do not involve hypervalent intermediates. When the leaving radical is tert-butyl, energy barriers ("G‡) for these reactions range from 27.1 (G3(MP2)RAD) kJ mol−1 for the formation of ...

HHigh-k LaAlO3 (LAO) thin films with and without Al2O3 buffer layers were deposited on n-type silicon substrates using a pulsed laser deposition method. The dielectric constant of the LAO thin film increased from 5.2 to 23.1 as its thickness increased from 20 to 500 Å. The effective dielectric constants of the LAO (120 Å)/Si and LAO(105 Å)/Al2O3(15 Å)/Si were 12.5 and 23.2, respectively. The fl...

OBJECTIVE To evaluate the association between alpha angle and herniation pit on MRI in asymptomatic hip joints and their associations with demographic variables. MATERIALS AND METHODS Hip MRI of 185 asymptomatic hip joints of 105 adults (age 18 to 80 years) from September 2011 through December 2012 were retrospectively studied. Alpha angles were measured on oblique axial MR images by 2 observ...

The element of the urinary tract that remains to be examined is the urethra. At fi rst, it was assessed with the use of a convex transducer via the transperineal access (fi g. 1). The registered image indicates a pathology in the region of the urethra, but it is insuffi cient to establish a defi nite diagnosis. Therefore, a linear high-frequency probe was placed at the same site (fi g. 2) which...

Advective accretion disks and winds are the most self-consistent solutions today. We describe this paradigm briefly and show how it attempts to explain some of the interesting observations of the galactic microquasar GRS1915+105.

A pseudorandom sequence generator (PRSG) maps a “short” random seed to a “long” pseudorandom bit string. For a PRSG to be cryptographically strong, it must be difficult to correctly predict any generated bit, even knowing all of the other bits of the output sequence. In particular, it must also be difficult to find the seed given the output sequence, since if one knows the seed, then the whole ...

The object of this paper is to present the results of the' study of cerebrospinal fluid examination with a view to estimating its role in diagnosis. C.S.F. examination in 105 cases in which nervous system involvement was suspected was undertaken, and the results of this examination were studied with special reference to the clinical diagnosis. These cases were followed till a final diagnosis wa...

I summarize recent near-infrared spectroscopy of the microquasar GRS 1915+105 with the ESO/VLT which allowed to (i) identify the donor and (ii) measure the orbital period and radial velocity amplitude. Assuming that the jet ejections occur perpendicular to the accretion disk and orbital plane, the mass of the black hole is determined to M = 14 ± 4 M⊙. I discuss the implications of this mass det...

Classical modelling suggests that, during the RXTE observations studied, GRS 1915+105 was near or above the critical accretion rate and the optically thick inner disk penetrated inside the advection-dominated flow. The system was very unstable leading to a rich pattern of variability , e.g. the rings which might be characteristic to disk instabilities very close to the innermost stable orbit. S...

Strings, drums, and instruments alike are able to produce a number of sounds. We are able to model these sounds by calculating the eigenvalues and eigenfunctions of the Laplacian equation, ∇2u = −λ2u. Through the solutions of this equation, we mathematically modeled the sounds we expected to hear for a string, a square drum, and a circular drum. After examining the resulting sounds and frequenc...