77 research outputs found
Seismology of active stars
In this review we will discuss the current standing and open questions of
seismology in active stars. With the longer photometric timeseries data that
are --and will become-- available from space-missions such as Kepler we foresee
significant progress in our understanding of stellar internal structures and
processes --including interactions between them-- taking place in active stars
in the next few years.Comment: 6 pages, 6 figures, accepted for publication in Astronomical Notes,
proceedings of "The New Era of Helio- and Asteroseismology", 2012. 05. 20-25,
Obergurgl (A
Energy evolution in time-dependent harmonic oscillator with arbitrary external forcing
The classical Hamiltonian system of time-dependent harmonic oscillator driven
by the arbitrary external time-dependent force is considered. Exact analytical
solution of the corresponding equations of motion is constructed in the
framework of the technique (Robnik M, Romanovski V G, J. Phys. A: Math. Gen.
{\bf 33} (2000) 5093) based on WKB approach. Energy evolution for the ensemble
of uniformly distributed w.r.t. the canonical angle initial conditions on the
initial invariant torus is studied. Exact expressions for the energy moments of
arbitrary order taken at arbitrary time moment are analytically derived.
Corresponding characteristic function is analytically constructed in the form
of infinite series and numerically evaluated for certain values of the system
parameters. Energy distribution function is numerically obtained in some
particular cases. In the limit of small initial ensemble's energy the relevant
formula for the energy distribution function is analytically derived.Comment: 16 pages, 5 figure
On the use of rotational splitting asymmetries to probe the internal rotation profile of stars. Application to Cephei stars
Rotationally-split modes can provide valuable information about the internal
rotation profile of stars. This has been used for years to infer the internal
rotation behavior of the Sun. The present work discusses the potential
additional information that rotationally splitting asymmetries may provide when
studying the internal rotation profile of stars. We present here some
preliminary results of a method, currently under development, which intends: 1)
to understand the variation of the rotational splitting asymmetries in terms of
physical processes acting on the angular momentum distribution in the stellar
interior, and 2) how this information can be used to better constrain the
internal rotation profile of the stars. The accomplishment of these two
objectives should allow us to better use asteroseismology as a test-bench of
the different theories describing the angular momentum distribution and
evolution in the stellar interiors.Comment: 4 pages, 2 figures; IV International Helas conference proceedings
(refereed). To be published in Astronomical Note
IEA EBC Annex 72: Assessing Life Cycle Related Environmental Impacts Caused by Buildings: Guidelines for design decision-makers:Energy in Buildings and Communities Technology Collaboration Programme
The purpose of this report is to provide support to the design decisions-makers during the design process. For each of the defined design step decision the important topics to consider were identified, the key stakeholders are declared and the purpose of LCA at the selected design step is defined.
The report covers:
The definition of the design steps, the definition of the tasks in each design step and an overview of the relevant milestones for performing LCA;
An overview of the systematic building decomposition methods and the appropriate levels at each design step;
An overview of the tools that can be used for LCA and a selection process for choosing the right LCA tool. A special emphasize is given to the topic of Building Information Modelling (BIM), how the BIM tools can facilitate the LCA assessment and what information should be implemented in the BIM model;
Strategies on how to reduce the design-related uncertainties;
An overview of the visualization of the LCA results and which are appropriate in the selected design steps
Signatures of Spontaneous Breaking of R-Parity in Gluino Cascade Decays at LHC
We study the pattern of gluino cascade decays in a class of supersymmetric
models where R-parity is spontaneously broken. We give a detailed discussion of
the R-parity violating decays of the lightest neutralino, the second lightest
neutralino and the lightest chargino. The multi-lepton and same-sign dilepton
signal rates expected in these models are compared with those predicted in the
Minimal Supersymmetric Standard Model. We show that these rates can be
substantially enhanced in broken R-parity models.Comment: 23 pages, LaTex file, 9 eps figures include
Enantioselective Cyanosilylation of Ketones by a Catalytic Double-Activation Method Employing Chiral Lewis Acid and Achiral N
Enantiomeric resolution of pyrethroids by high-performance liquid chromatography with diode-laser polarimetric detection
Abstract Liquid chromatographic separation of the pyrethroid insecticides, bifenthrin and fenpropathrin, has been investigated with various achiral and chiral stationary phases. The identification of enantiomers of fenpropathrin and bifenthrin has been carried out by using two detectors in high-performance liquid chromatography: a UV spectrometer and a diode-laser polarimeter. Optimization of the mobile phase has been performed dealing regard to analyte resolution and polarimetric signal values
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