3,263 research outputs found
Full two-electron calculations of antiproton collisions with molecular hydrogen
Total cross sections for single ionization and excitation of molecular
hydrogen by antiproton impact are presented over a wide range of impact energy
from 1 keV to 6.5 MeV. A nonpertubative time-dependent close-coupling method is
applied to fully treat the correlated dynamics of the electrons. Good agreement
is obtained between the present calculations and experimental measurements of
single-ionization cross sections at high energies, whereas some discrepancies
with the experiment are found around the maximum. The importance of the
molecular geometry and a full two-electron description is demonstrated. The
present findings provide benchmark results which might be useful for the
development of molecular models.Comment: 4 pages, 3 figure
Technologies for 3D Heterogeneous Integration
3D-Integration is a promising technology towards higher interconnect
densities and shorter wiring lengths between multiple chip stacks, thus
achieving a very high performance level combined with low power consumption.
This technology also offers the possibility to build up systems with high
complexity just by combining devices of different technologies. For ultra thin
silicon is the base of this integration technology, the fundamental processing
steps will be described, as well as appropriate handling concepts. Three main
concepts for 3D integration have been developed at IZM. The approach with the
greatest flexibility called Inter Chip Via - Solid Liquid Interdiffusion
(ICV-SLID) is introduced. This is a chip-to-wafer stacking technology which
combines the advantages of the Inter Chip Via (ICV) process and the
solid-liquid-interdiffusion technique (SLID) of copper and tin. The fully
modular ICV-SLID concept allows the formation of multiple device stacks. A test
chip was designed and the total process sequence of the ICV-SLID technology for
the realization of a three-layer chip-to-wafer stack was demonstrated. The
proposed wafer-level 3D integration concept has the potential for low cost
fabrication of multi-layer high-performance 3D-SoCs and is well suited as a
replacement for embedded technologies based on monolithic integration. To
address yield issues a wafer-level chip-scale handling is presented as well, to
select known-good dies and work on them with wafer-level process sequences
before joining them to integrated stacks.Comment: Submitted on behalf of EDA Publishing Association
(http://irevues.inist.fr/handle/2042/16838
Presence of an expressed 13-tubulin gene (TUBB) in the HLA class I region may provide the genetic basis for HLA-linked microtubule dysfunction
An expressed beta-tubulin gene (TUBB) has previously
been localized to chromosome region 6pter-p21
in man. By using a panel of deletion mutant cell lines and
radiation-reduced hybrids containing fragments of chromosome
6, the TUBB locus could be mapped to the HLA
class I region at 6p21.3. A long range restriction map including
TUBB and several HLA class I genes was then
generated by rotating field gel electrophoresis. The results
show that TUBB maps to a segment 170-370 kb telomeric
of HLA-C. This location suggests that a mutation at the
TUBB locus could be the cause for certain forms of HLAlinked
microtubule dysfunction, including immotile cilia
syndrome
Collisions of antiprotons with hydrogen molecular ions
Time-dependent close-coupling calculations of the ionization and excitation
cross section for antiproton collisions with molecular hydrogen ions are
performed in an impact-energy range from 0.5 keV to 10 MeV. The
Born-Oppenheimer and Franck-Condon approximations as well as the impact
parameter method are applied in order to describe the target molecule and the
collision process. It is shown that three perpendicular orientations of the
molecular axis with respect to the trajectory are sufficient to accurately
reproduce the ionization cross section calculated by [Sakimoto, Phys. Rev. A
71, 062704 (2005)] reducing the numerical effort drastically. The
independent-event model is employed to approximate the cross section for double
ionization and H+ production in antiproton collisions with H2.Comment: 12 pages, 5 figures, 4 table
Stopping power of antiprotons in H, H2, and He targets
The stopping power of antiprotons in atomic and molecular hydrogen as well as
helium was calculated in an impact-energy range from 1 keV to 6.4 MeV. In the
case of H2 and He the targets were described with a single-active electron
model centered on the target. The collision process was treated with the
close-coupling formulation of the impact-parameter method. An extensive
comparison of the present results with theoretical and experimental literature
data was performed in order to evaluate which of the partly disagreeing
theoretical and experimental data are most reliable. Furthermore, the size of
the corrections to the first-order stopping number, the average energy
transferred to the target electrons, and the relative importance of the
excitation and the ionization process for the energy loss of the projectile was
determined. Finally, the stopping power of the H, H2, and He targets were
directly compared revealing specific similarities and differences of the three
targets.Comment: v1: 12 pages, 8 figures, and 1 table v2: 15 pages, 9 figures, and 2
tables; extended discussion on IPM in Method; influence of double ionization
on stopping power discussed in Result
Brunner and Luther on Scriptural Authority
In its struggle with Roman Catholicism the Reformation made its appeal from tradition and an authoritatively interpreting Church to the Scriptures. This basic approach of the Reformers is obvious and universally recognized. Some writers, nonetheless, have failed to note the complete cleavage between Romanism and the Reformers at this point. Emil Brunner sees clearly that whatever the token deference of Rome to the authority of Scripture may be, in point of fact Rome forsakes Scripture and rests her authority in the interpretive and teaching office of the Church. Rome operates with die massgebende Autoritaet der kirchlichen Schriftauslegung
Thermally isolated Luttinger liquids with noisy Hamiltonians
We study the dynamics of a quantum-coherent thermally isolated Luttinger
liquid with noisy Luttinger parameter. To characterize the fluctuations of the
absorbed energy in generic noise-driven systems, we first identify two types of
energy moments, which can help tease apart the effects of classical
(sample-to-sample) and quantum sources of fluctuations. One type of moment
captures the total fluctuations due to both sources, while the other one
captures the effect of the classical source only. We then demonstrate that in
the Luttinger liquid case, the two types of moments agree in the thermodynamic
limit, indicating that the classical source dominates. In contrast to
equilibrium thermodynamics, in this driven system the relative fluctuations of
energy do not decay with the system size. Additionally, we study the deviations
of equal-time correlation functions from their ground-state value, and find a
simple scaling behavior.Comment: 11 pages, 2 figure
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