4,547 research outputs found
Alterungsverhalten einer teilvernetzten Dünnfilm-Epoxidbeschichtung
No full textAuthor Stelzer Viktoria, BScAbweichender Titel laut Übersetzung der Verfasserin/des VerfassersMasterarbeit Johannes Kepler Universität Linz 2025Arbeit gesperr
Multivariate Markov-switching ARMA processes with regularly varying noise
No full textThe tail behaviour of stationary R^d-valued Markov-Switching ARMA processes driven by a regularly varying noise is analysed. It is shown that under appropriate summability conditions the MS-ARMA process is again regularly varying as a sequence. Moreover, the feasible stationarity condition given in Stelzer (2006) is extended to a criterion for regular variation. Our results complement in particular those of Saporta (2005) where regularly varying tails of one-dimensional MS-AR(1) processes coming from consecutive large parameters were studied
Digital Art History - Bauhaus & Influences
No full textResearching for a digital exhibition comparing the Bauhaus and its effect on contemporary design in layout
Talismanic Texts
No full textThis essay wishes to investigate the notion of 'talismanic text' sensu Jeanette Winterson, particularly focusing on the interaction between talismanic texts and authors. Case studies include Winterson's rewriting of Shakespeare's The Winter's Tale (The Gap of Time, 2015) and The Book of Margery Kempe
Mixing conditions for multivariate infinitely divisible processes with an application to mixed moving averages and the supOU stochastic volatility model
No full textWe consider strictly stationary infinitely divisible processes and first extend the mixing
conditions given in Maruyama [18] and Rosinski and Zak [23] from the univariate to the
d-dimensional case.
Thereafter, we show that multivariate Lévy-driven mixed moving average processes
satisfy these conditions and hence a wide range of well-known processes such as superpositions
of Ornstein-Uhlenbeck (supOU) processes or (fractionally integrated) continuous
time autoregressive moving average (CARMA) processes are always mixing. Finally,
mixing of the log-returns and the integrated volatility process of a multivariate supOU
type stochastic volatility model, recently introduced in Barndorff-Nielsen and Stelzer [5],
is established
Cultural and Genre Markers in Lucy Hutchinson's Order and Disorder
No full textOrder and Disorder, since its attribution to Lucy Hutchinson (1620-1681) at the turn of the twenty-first century, has been hailed as Eve’s version of Genesis, as the first epic poem by an English woman, even conjuring a Paradise Lost written by “Judith Milton”. More recently, scholars have questioned the genre of this unfinished poem in 20 cantos, moving it from the category of epic to that of the biblical meditation and paraphrase. Hutchinson’s work expresses what Elizabeth Scott-Baumann (2013, 197) has termed a “poetics of not knowing”: negotiating the need to remain faithful to the Biblical narrative and a desire to express the ineffable, Hutchinson promises her readers in the Preface that they will find “nothing of fancy”, “no elevations of style, no charms of language”, and yet, the author resorts to an array of techniques to sing the sublimity of the “mystic wonders” with which her “ravished soul” has been “fire[d]” (1.1-2). Such devices include gendered modesty tropes; apophasis; potentially subversive conditionals and subjunctives; a complex intertextuality with authors ranging from Virgil and Lucretius to Du Bartas, Edmund Spenser, and even Shakespeare, and a complication of the readerly experience via paratextual glosses. This essay wishes to revisit the assessment of such techniques and suggest that Hutchinson weaves in her poem different markers to voice the varying degrees of her “endless admiration” (1.15)
XMM-Newton spectroscopy of the metal depleted T Tauri star TWA 5
No full textWe present results of X-ray spectroscopy for TWA 5, a member of the young TW Hydrae association, observed with XMM-Newton. TWA 5 is a multiple system which shows Hα emission, a signature typical of classical T Tauri stars, but no infrared excess. From this analysis of the RGS and EPIC spectra, we have derived the emission measure distribution vs. temperature of the X-ray emitting plasma, its abundances, and the electron density. The characteristic temperature and density of the plasma suggest a corona similar to that of weak-line T Tauri stars and active late-type main sequence stars. TWA 5 also shows low iron abundance (~0.1 times the solar photospheric one) and a pattern of increasing abundances for elements with increasing first ionization potential reminiscent of the inverse FIP effect observed in highly active stars. The especially high ratio Ne/Fe ̃10 is similar to that of the classical T Tauri star TW Hya, where the accreting material has been held responsible for the X-ray emission. We discuss the possible role of an accretion process in this scenario. Since all T Tauri stars in the TW Hydrae association studied so far have very high Ne/Fe ratios, we also propose that environmental conditions may cause this effect
Oregon permanency roundtables
No full textprepared by Catherine Stelzer, MSW, Cross Systems Coordinator, Oregon Department of Human Services."... the state implemented Permanency Roundtables as a pilot project aimed at increasing the number of children in long-term foster care receiving legal permanent placements and/or increasing permanent connections"--Page 2.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Casey Family Programs supports this work through a partnership with DHS, the Oregon Commission on Children and Families and the Oregon Judicial Department.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
A Novel Technique to Reconstruct the Mass of the Associated Z boson Decaying into Jets in W+Z and Z+Z Events with Lepton(s), Missing Transverse Energy and Three Jets.
No full textThe study of associated WZ boson production with a lepton and a neutrino signaling the W, and a bb-pair in the final state is important since the event topology of this process is the same as expected for WH associated production of a W and the Standard Model light-Higgs boson (M_{H} lnubb whose rate can be accurately predicted, allows to calibrate and optimize many of techniques used in the SM Higgs search and provides a ``standard candle'' for that crucially important search. In addition, WZ associated production generates a significant background for low mass Higgs Boson searches with H decaying into a bb pair.
At the Tevatron, the process WH-> W bb has an expected cross section about five times lower than WZ->Wbb for m_H~ 120 GeV/c2. Therefore, observing that process would be a benchmark for the even more difficult search for the light Higgs in the WH->Wbb process.
Observing associated WZ production at the Tevatron in the channel WZ->lnubb is extremely difficult for two main reasons.
The event rate is extremely low. A WZ production cross section of ~3.22 pb together with a Z->bb branching ratio of ~15% provides about 50 fb in the WZ->lnubb channel. With a trigger and kinematical selection efficiency of the order of a few %, one expects a handful of events per fb^-1 of integrated luminosity.
This statement remains valid even if the few ZZ events with leptonic decay of one Z are included in the acceptance.
A standard kinematical cut requests exactly two high energy jets (i.e. E_{T}> 20 GeV) in the candidate sample. Simulations show that if a third energetic jet is allowed the signal acceptance is increased by about 1/3. Therefore, it would be very important to be able to extract a Z->bb signal also in events with more than two high energy jets.
A second difficulty is that the signal to background ratio is very poor, due primarily to the contribution of associated production of and incoherent jets. Optimal dijet mass resolution is of utmost importance for discriminating this background, since a fit to the invariant mass distribution of the two jets, associated to the hadronic decay of , is used to disentangle the diboson signal from the backgrounds in the candidate data sample.
In this thesis, we present a search for WZ/ZZ in events with a lepton(s), missing transverse energy and jets. Besides looking at the sample where two exclusive jets are found, we investigate the sample with 3 jets where about the 33% of the signal events lie.
In WZ events, additional jets may be initiated by gluon(s) radiated by the interacting partons (initial state radiation, ISR) or by the Z-decay products (final state radiation, FSR). FSR jets should legitimately be included in the reconstructed Z-mass.
However, the presence of either ISR or FSR jets in a 3-jets events confuses the choice of the jet system to be attributed to Z decay. In this sample the invariant mass of the two E_T-leading jets would normally be chosen to reconstruct the Z boson. To improve both the mass resolution and the sensitivity of the search we describe an alternative procedure to reconstruct the Z-invariant mass. Improving the resolution in such a sample means choosing the correct jet combination for building the Z mass.
My thesis work has been to investigate at generator level a sample of simulated CDF WZ events for finding a means to determine the origin of the extra jet and the right jet combination to be chosen for the best reconstruction of the Z mass. This is attempted for the first time in CDF.
Four different Neural Networks (NNs) have been trained: NN, NN, NN and NN. These NNs should make us to be able to decide event by event which among of the 4 four possible different combinations can be used for building the -mass in the three jets sample. If one jet is due to ISR, we expect one of the MJ1J2, MJ1J3, MJ2J3 combinations to be correct, while if one jet is due to FSR the choice should be MJ1J2J3. NNs combine kinematical information and some tools developed by CDF Collaboration for distinguishing gluon-like and b-like jets from light-flavored jets.
Based on the response of the four NNs, we determine the most likely jet combination for building the Z mass in each event. The method allow to use a different combination from J1J2 in about 50% of cases.
To qualify the potential of the method we have studied an experimental data sample accepting events with a leptonically decaying W and 3 large transverse momentum jets, as in the studies of the simulated WZ sample. The selection cuts accept jets of all flavors (pretag sample), and all diboson events including WW besides WZ, ZZ may pass the cuts. We estimate the probability at three standard deviations level to extract an inclusive diboson signal in the 3-jets sample alone (P). After our procedure for building the Z mass is applied, P is about 4 times greater than when building the Z mass ``by default'' with the two E_{T} leading jets.
The next step would be to discriminate against the WW contribution. A straight ``Higgs like'' approach would be to require b-jets in the events. When one or more jets are required to be b-like (the \emph{tag} sample) our technique, if applied stand-alone, provides only a modest improvement in sensitivity over the option of building the Z-mass from J1J2. Studies for improving the method further are on-going.
However, already now our technique allows including the three jets sample in the WZ/ZZ analyses in order to increase acceptance and sensitivity in the search for the hadronically decaying Z-boson
Generalised partial autocorrelations and the mutual information between past and future
No full textThe paper introduces the generalised partial autocorrelation (GPAC) coefficients of a stationary stochastic process. The latter are related to the generalised autocovariances, the inverse Fourier transform coefficients of a power transformation of the spectral density function. By interpreting the generalised partial autocorrelations as the partial autocorrelation coefficients of an auxiliary process, we derive their properties and relate them to essential features of the original process.
Based on a parameterisation suggested by Barndorff-Nielsen and Schou (1973) and on Whittle likelihood, we develop an estimation strategy for the GPAC coefficients. We further prove that the GPAC coefficients can be used to estimate the mutual information between the past and the future of a time series
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