114 research outputs found
Ab initio density functional investigation of B_24 cluster: Rings, Tubes, Planes, and Cages
We investigate the equilibrium geometries and the systematics of bonding in
various isomers of a 24-atom boron cluster using Born-Oppenheimer molecular
dynamics within the framework of density functional theory. The isomers studied
are the rings, the convex and the quasiplanar structures, the tubes and, the
closed structures. A staggered double-ring is found to be the most stable
structure amongst the isomers studied. Our calculations reveal that a 24-atom
boron cluster does form closed 3-d structures. All isomers show staggered
arrangement of nearest neighbor atoms. Such a staggering facilitates
hybridization in boron cluster. A polarization of bonds between the peripheral
atoms in the ring and the planar isomers is also seen. Finally, we discuss the
fusion of two boron icosahedra. We find that the fusion occurs when the
distance between the two icosahedra is less than a critical distance of about
6.5a.u.Comment: 8 pages, 9 figures in jpeg format Editorially approved for
publication in Phys. Rev.
Quantization of adiabatic pumped charge in the presence of superconducting lead
We investigate the parametric electron pumping of a double barrier structure
in the presence of a superconducting lead. The parametric pumping is
facilitated by cyclic variation of the barrier heights and of the
barriers. In the weak coupling regime, there exists a resonance line in the
parameter space so that the energy of the quasi-bound state is in
line with the incoming Fermi energy. Levinson et al found recently that the
pumped charge for each pumping cycle is quantized with for normal
structure when the pumping contour encircles the resonance line. In the
presence of a superconducting lead, we find that the pumped charge is quantized
with the value
Influence of Filler Alloy Composition and Process Parameters on the Intermetallic Layer Thickness in Single-Sided Cold Metal Transfer Welding of Aluminum-Steel Blanks
Open data from the third observing run of LIGO, Virgo, KAGRA, and GEO
The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, LIGO Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed of three phases: O3a starting in 2019 April and lasting six months, O3b starting in 2019 November and lasting five months, and O3GK starting in 2020 April and lasting two weeks. In this paper we describe these data and various other science products that can be freely accessed through the Gravitational Wave Open Science Center at https://gwosc.org. The main data set, consisting of the gravitational-wave strain time series that contains the astrophysical signals, is released together with supporting data useful for their analysis and documentation, tutorials, as well as analysis software packages
933 The intriguing role of fibroblast in finasteride's function on prostate cancer cells
A new method for computing the uniaxial modulus of articular cartilages using modified inhomogeneous triphasic model
- âŠ