Refine
Year of publication
- 2004 (483) (remove)
Document Type
- Article (163)
- Working Paper (71)
- Part of a Book (68)
- Preprint (48)
- Doctoral Thesis (43)
- Part of Periodical (34)
- Conference Proceeding (28)
- Report (13)
- Book (10)
- diplomthesis (2)
Language
- English (483) (remove)
Keywords
- Syntax (26)
- Generative Transformationsgrammatik (23)
- Wortstellung (19)
- Deutsch (16)
- Optimalitätstheorie (12)
- Phonologie (11)
- Deutschland (9)
- Englisch (8)
- Formale Semantik (8)
- Informationsstruktur (8)
Institute
- Physik (75)
- Wirtschaftswissenschaften (38)
- Center for Financial Studies (CFS) (28)
- Medizin (27)
- Extern (24)
- Biochemie und Chemie (23)
- Frankfurt Institute for Advanced Studies (FIAS) (20)
- Biowissenschaften (12)
- Informatik (12)
- Mathematik (9)
Alzheimer’s disease (AD) is the most common neurodegenerative disorder world wide, causing presenile dementia and death of millions of people. During AD damage and massive loss of brain cells occur. Alzheimer’s disease is genetically heterogeneous and may therefore represent a common phenotype that results from various genetic and environmental influences and risk factors. In approximately 10% of patients, changes of the genetic information were detected (gene mutations). In these cases, Alzheimer’s disease is inherited as an autosomal dominant trait (familial Alzheimer’s disease, FAD). In rare cases of familial Alzheimer’s disease (about 1-3%), mutations have been detected in genes on chromosomes 14 and 1 (encoding for Presenilin 1 and 2, respectively), and on chromosome 21 encoding for the amyloid precursor protein (APP), which is responsible for the release of the cell-damaging protein amyloid-beta (ß-amyloid, Aß). Familial forms of early-onset Alzheimer’s disease are rare; however, their importance extends far beyond their frequency, because they allow to identify some of the critical pathogenetic pathways of the disease. All familial Alzheimer mutations share a common feature: they lead to an enhanced production of the Aß, which is the major constituent of senile plaques in brains of AD patients. New data indicates that Aß promotes neuronal degeneration. Therefore, one aim of these thesis was to elucidate the neurotoxic biochemical pathways induced by Aß, investigating the effect of the FAD Swedish APP double mutation (APPsw) on oxidative stress-induced cell death mechanisms. This mutation results in a three- to sixfold increased Aß production compared to wild-type APP (APPwt). As cell models, the neuronal PC12 (rat pheochromocytoma) and the HEK (human embryonic kidney 293) cell lines were used, which have been transfected with human wiltyp APP or human APP containing the Swedish double mutation. The used cell models offer two important advantages. First, compared to experiments using high concentrations of Aß at micromolar levels applied extracellularly to cells, PC12 APPsw cells secret low Aß levels similar to the situation in FAD brains. Thus, this cell model represents a very suitable approach to elucidate the AD-specific cell death pathways mimicking physiological conditions. Second, these two cell lines (PC12 and HEK APPwt and APPsw) with different production levels of Aß may additionally allow to study dose-dependent effects of Aß. The here obtained results provide evidence for the enhanced cell vulnerability caused by the Swedish APP mutation and elucidate the cell death mechanism probably initiated by intracellulary produced Aß. Here it seems likely that increased production of Aß at physiological levels primes APPsw PC12 cells to undergo cell death only after additional stress, while chronic high levels in HEK cells already lead to enhanced basal apoptotic levels. Crucial effects of the Swedish APP mutation include the impairments of cellular energy metabolism affecting mitochondrial membrane potential and ATP levels as well as the additional activation of caspase 2, caspase 8 and JNK in response to oxidative stress. Thereby ,the following model can be proposed: PC12 cells harboring the Swedish APP mutation have a reduced energy metabolism compared to APPwt or control cells. However, this effect does not leads to enhanced basal apoptotic levels of cultured cells. An exposure of PC12 cells to oxidative stress leads to mitochondrial dysfunction, e.g., decrease in mitochondrial membrane potential and depletion in ATP. The consequence is the activation of the intrinsic apoptotic pathway releasing cytochrome c and Smac resulting in the activation of caspase 9. This effect is amplified by the overexpression of APP, since both APPsw and APPwt PC12 cells show enhanced cytochrome c and Smac release as well as enhanced caspase 9 activity as vector transfected control. In APPsw PC12 cells a parallel pathway is additionally emphased. Due to reduced ATP levels or enhanced Aß production JNK is activated. Furthermore, the extrinsic apoptotic pathway is enhanced, since caspase 8 and caspase 2 activation was clearly enhanced by the Swedish APP mutation. Both pathways may then converge by activating the effector enzyme, caspase 3, and the execution of cell death. In addition, caspase independent effects also needs to be considered. One possibility could be the implication of AIF since AIF expression was found to be induced by the Swedish APP mutation. In APPsw HEK cells high chronic Aß levels leads to enhanced apoptotic levels, reduce mitochondrial membrane potential and ATP levels even under basal conditions. Summarizing, a hypothetical sequence of events is proposed linking FAD, Aß production, JNK-activation, mitochondrial dysfunction with caspase pathway and neuronal loss for our cell model. The brain has a high metabolic rate and is exposured to gradually rising levels of oxidative stress during life. In Swedish FAD patients the levels of oxidative stress are increased in the temporal inferior cortex. This study using a cell model mimicking the in vivo situation in AD brains indicates that probably both, increased Aß production and the gradual rise of oxidative stress throughout life converge at a final common pathway of an increased vulnerability of neurons to apoptotic cell death from FAD patients. Presenilin (PS) 1 is an aspartyl protease, involved in the gamma-secretase mediated proteolysis of Amyloid-ß-protein (Aß), the major constituent of senile plaques in brains of Alzheimer’s disease (AD) patients. Recent studies have suggested an additional role for presenilin proteins in apoptotic cell death observed in AD. Since PS 1 is proteolytic cleaved by caspase 3, it has been prosposed that the resulting C-terminal fragment of PS1 (PSCas) could play a role in signal transduction during apoptosis. Moreover, it was shown that mutant presenilins causing early-onset of familial Alzheimer's disease (FAD) may render cells vulnerable to apoptosis. The mechanism by which PS1 regulates apoptotic cell death is yet not understood. Therefore one aim of our present study was to clarify the involvement of PS1 in the proteolytic cascade of apoptosis and if the cleavage of PS1 by caspase 3 has an regulatory function. Here it is demonstrated that both, PS1 and PS1Cas lead to a reduced vulnerability of PC12 and Jurkat cells to different apoptotic stimuli. However a mutation at the caspase 3 recognition site (D345A/ PSmut), which inhibits cleavage of PS1 by caspase 3, show no differences in the effect of PS1 or PSCas towards apoptotic stimuli. This suggest that proteolysis of PS1 by caspase 3 is not a determinant, but only a secondary effect during apoptosis. Since several FAD mutation distributed through the whole PS1 gene lead to enhanced apoptosis, an abolishment of the antiapoptotic effect of PS1 might contribute to the massive neurodegeneration in early age of FAD patients. Here, the regulate properties of PS1 in apoptosis may not be through an caspase 3 dependent cleavage and generation of PSCas, but rather through interaction of PS1 with other proteins involved in apoptosis.
Global reserves of coal, oil and natural gas are diminishing; global energy requirements however are dramatically increasing. Renewable energy sources lower the threat to the earth’s climate but are not able to meet the energy consumption in major urban areas. The opinion of many experts is that the future will be dominated by hydrogen. However, this gas is essentially totally manufactured from fossil fuels and is hence of limited abundance – not to mention the hazards involved in its utilisation. - A novel energy concept involving solar and thus carbon-independent hydrogen-based technology necessitates an intermediate storage vehicle for renewable energy. This future energy carrier should be simple to manufacture, be available to an unlimited degree or at least be suitable for recycling, be able to store and transport the energy without hazards, demonstrate a high energy density and release no carbon dioxide or other climatically detrimental substances. - Silicon successfully functions as a tailor-made intermediate linking decentrally operating renewable energy-generation technology with equally decentrally organised hydrogen-based infrastructure at any location of choice. In contrast to oil and in particular hydrogen, the transport and storage of silicon are free from potential hazards and require a simple infrastructure similar to that needed for coal.
The flora of the Lord Howe Island Group (31°30’S, 159°05’E) comprises a unique mix of elements of Australian, New Zealand and New Caledonian floras. It is significant for its high degree of endemism and for its structural and biological (leaves, flowers, fruit) role in supporting a diverse array of fauna. Conservation of this flora is dependant upon: reducing current habitat degradation (mostly the result of exotic weeds); minimising any future impacts, in particular the effects of climate change on the unique cloud forests of the southern mountains and the continued introduction and spread of weeds and the pathogen Phytophthora cinnamomi.
We provide a description of the nature of the major threats to the flora and suggest an area-based scheme, focussed on the relative conservation significance of remaining vegetation, as a mechanism for developing priorities for threat mitigation activities. While a number of threat control works are in place, eg. weed control, some re-emphasis is needed. In addition, some new initiatives are required including: reducing the rate of introductions of new exotics; a system to remove potential environmental weeds from the settlement area; phytosanitary guidelines; pathogen quarantine measures; search and removal of environmental weeds from remote areas; and ex situ initiatives for plant species restricted to the cloud forests of the southern mountains.
The claim advanced in this paper is that the presence of a left-dislocated element together with a resumptive clitic in Bulgarian is a special case of argument saturation with implications for the focus structure of the clause, while contrast involves discontinuous focus (contrastive topics/foci) with no clitics present in the derivation. Contrastive topic/focus constructions in Bulgarian can be united on the view that they involve (sets of) ordered pairs where the higher element is valuing a contrastive feature (cf. OCC in Chomsky 2001) while the element in the VP is a non-contrastive topic or focus. The contrastive feature participates in wh-structures but not in clitic-left-dislocated structures where pairing between arguments is 'accidental'.
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158 A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at mid-rapidity and in full phase space shows a pronounced maximum between the highest AGS and 40 A GeV SPS energies, whereas the anti-Lambda}/pi ratio exhibits a monotonic increase. PACS numbers: 25.75.-q
The transverse mass mt distributions for deuterons and protons are measured in Pb+Pb reactions near midrapidity and in the range 0<mt–m<1.0 (1.5) GeV/c2 for minimum bias collisions at 158A GeV and for central collisions at 40 and 80 A GeV beam energies. The rapidity density dn/dy, inverse slope parameter T and mean transverse mass <mt> derived from mt distributions as well as the coalescence parameter B2 are studied as a function of the incident energy and the collision centrality. The deuteron mt spectra are significantly harder than those of protons, especially in central collisions. The coalescence factor B2 shows three systematic trends. First, it decreases strongly with increasing centrality reflecting an enlargement of the deuteron coalescence volume in central Pb+Pb collisions. Second, it increases with mt. Finally, B2 shows an increase with decreasing incident beam energy even within the SPS energy range. The results are discussed and compared to the predictions of models that include the collective expansion of the source created in Pb+Pb collisions.
A large literature over several decades reveals both extensive concern with the question of time-varying betas and an emerging consensus that betas are in fact time-varying, leading to the prominence of the conditional CAPM. Set against that background, we assess the dynamics in realized betas, vis-à-vis the dynamics in the underlying realized market variance and individual equity covariances with the market. Working in the recently-popularized framework of realized volatility, we are led to a framework of nonlinear fractional cointegration: although realized variances and covariances are very highly persistent and well approximated as fractionally-integrated, realized betas, which are simple nonlinear functions of those realized variances and covariances, are less persistent and arguably best modeled as stationary I(0) processes. We conclude by drawing implications for asset pricing and portfolio management. JEL Klassifikation: C1, G1
We characterize the response of U.S., German and British stock, bond and foreign exchange markets to real-time U.S. macroeconomic news. Our analysis is based on a unique data set of high-frequency futures returns for each of the markets. We find that news surprises produce conditional mean jumps; hence high-frequency stock, bond and exchange rate dynamics are linked to fundamentals. The details of the linkages are particularly intriguing as regards equity markets. We show that equity markets react differently to the same news depending on the state of the economy, with bad news having a positive impact during expansions and the traditionally-expected negative impact during recessions. We rationalize this by temporal variation in the competing "cash flow" and "discount rate" effects for equity valuation. This finding helps explain the time-varying correlation between stock and bond returns, and the relatively small equity market news effect when averaged across expansions and recessions. Lastly, relying on the pronounced heteroskedasticity in the high-frequency data, we document important contemporaneous linkages across all markets and countries over-and-above the direct news announcement effects. JEL Klassifikation: F3, F4, G1, C5
Evidence for an exotic S=-2, Q=-2 baryon resonance in proton-proton collisions at the CERN SPS
(2004)
Results of resonance searches in the Xi - pi -, Xi - pi +, Xi -bar+ pi -, and Xi -bar+ pi + invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi - pi - baryon resonance with mass of 1.862±0.002 GeV/c2 and width below the detector resolution of about 0.018 GeV/c2. The significance is estimated to be above 4.2 sigma . This state is a candidate for the hypothetical exotic Xi --3/2 baryon with S=-2, I=3 / 2, and a quark content of (dsdsu-bar). At the same mass, a peak is observed in the Xi - pi + spectrum which is a candidate for the Xi 03/2 member of this isospin quartet with a quark content of (dsusd-bar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
System size and centrality dependence of the balance function in A + A collisions at √sNN = 17.2 GeV
(2004)
Electric charge correlations were studied for p+p, C+C, Si+Si and centrality selected Pb+Pb collisions at sqrt s_NN = 17.2$ GeV with the NA49 large acceptance detector at the CERN-SPS. In particular, long range pseudo-rapidity correlations of oppositely charged particles were measured using the Balance Function method. The width of the Balance Function decreases with increasing system size and centrality of the reactions. This decrease could be related to an increasing delay of hadronization in central Pb+Pb collisions.
Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20, 30, 40, 80 and 158 AGeV. The observed fluctuations are close to those expected for a gas of pions correlated by global charge conservation only. These fluctuations are considerably larger than those calculated for an ideal gas of deconfined quarks and gluons. The present measurements do not necessarily exclude reduced fluctuations from a quark-gluon plasma because these might be masked by contributions from resonance decays.
The German word also, similar to English so, is traditionally considered to be a sentence adverb with a consecutive meaning, i.e. it indicates that the propositional content of the clause containing it is some kind of consequence of what has previously been said. As a sentence adverb, also has its place within the core of the German sentence, since this is the proper place for an adverb to occur in German. The sentence core offers two proper positions for adverbs: the so-called front field and the middle field. In spoken German, however, also often occurs in sentence-initial position, outside the sentence itself. In this paper, I will use excerpts of German conversations to discuss and illustrate the importance of the sentence positions and the discourse positions for the functions of also on the basis of some German conversations.
It is common knowledge in the field of Philippine linguistics that an ang-marked direct object in a non-actor focus clause must be definite or generic, while a ng-marked object in an actor focus clause typically receives a nonspecific interpretation. However, in contexts like wh-questions, the oblique object in an antipassive may be interpreted as specific, as noted by Schachter & Otanes (1972), Maclachlan & Nakamura (1997), Rackowski (2002), and others. […] In this paper, I propose to account for the specificity effects […] within the analysis of Tagalog syntax put forth by Aldridge (2004). I analyze Tagalog as an ergative language […]. Cross linguistically, antipassive oblique objects receive a nonspecific interpretation, while absolutives are definite or generic. I show in this paper how the Tagalog facts can be subsumed under a general account of ergativity.
his Erratum replaces incorrect plots shown in Fig. 7 with the corrected ones. In the publication, the NA57 [1] ratios of Ξ− and Ξ¯¯¯¯+ to the number of wounded nucleons at ⟨NW⟩=349 by mistake were plotted at the wrong values. The ratios were calculated and plotted by mistake using ⟨NW⟩=249.
The correct normalization does not change the conclusions of the paper. The correctly normalized results are presented in Fig. 7.
Mid-rapidity transverse mass spectra and multiplicity densities of charged and neutral kaons are reported for Au + Au collisions at √sNN = 130 GeV at RHIC. The spectra are exponential in transverse mass, with an inverse slope of about 280 MeV in central collisions. The multiplicity densities for these particles scale with the negative hadron pseudo-rapidity density. The charged kaon to pion ratios are K+/π− = 0.161± 0.002(stat) ± 0.024(syst) and K−/π− = 0.146± 0.002(stat) ± 0.022(syst) for the most central collisions. The K+/π− ratio is lower than the same ratio observed at the SPS while the K−/π− is higher than the SPS result. The ratios are enhanced by about 50% relative to p + p and p¯ + p collision data at similar energies.
We present STAR measurements of charged hadron production as a function of centrality in Au+Au collisions at sqrt[sNN ]=130 GeV . The measurements cover a phase space region of 0.2< pT <6.0 GeV/c in transverse momentum and -1< eta <1 in pseudorapidity. Inclusive transverse momentum distributions of charged hadrons in the pseudorapidity region 0.5< | eta | <1 are reported and compared to our previously published results for | eta | <0.5 . No significant difference is seen for inclusive pT distributions of charged hadrons in these two pseudorapidity bins. We measured dN/d eta distributions and truncated mean pT in a region of pT > pcutT , and studied the results in the framework of participant and binary scaling. No clear evidence is observed for participant scaling of charged hadron yield in the measured pT region. The relative importance of hard scattering processes is investigated through binary scaling fraction of particle production.
We present data on e+ e- pair production accompanied by nuclear breakup in ultraperipheral gold-gold collisions at a center of mass energy of 200 GeV per nucleon pair. The nuclear breakup requirement selects events at small impact parameters, where higher-order diagrams for pair production should be enhanced. We compare the data with two calculations: one based on the equivalent photon approximation, and the other using lowest-order quantum electrodynamics (QED). The data distributions agree with both calculations, except that the pair transverse momentum spectrum disagrees with the equivalent photon approach. We set limits on higher-order contributions to the cross section.
Transverse energy ( ET ) distributions have been measured for Au+Au collisions at sqrt[sNN ]=200 GeV by the STAR Collaboration at RHIC. ET is constructed from its hadronic and electromagnetic components, which have been measured separately. ET production for the most central collisions is well described by several theoretical models whose common feature is large energy density achieved early in the fireball evolution. The magnitude and centrality dependence of ET per charged particle agrees well with measurements at lower collision energy, indicating that the growth in ET for larger collision energy results from the growth in particle production. The electromagnetic fraction of the total ET is consistent with a final state dominated by mesons and independent of centrality.
The transverse mass spectra and midrapidity yields for Xi s and Omega s are presented. For the 10% most central collisions, the Xi -bar+/h- ratio increases from the Super Proton Synchrotron to the Relativistic Heavy Ion Collider energies while the Xi -/h- stays approximately constant. A hydrodynamically inspired model fit to the Xi spectra, which assumes a thermalized source, seems to indicate that these multistrange particles experience a significant transverse flow effect, but are emitted when the system is hotter and the flow is smaller than values obtained from a combined fit to pi , K, p, and Lambda s.
We report inclusive photon measurements about midrapidity ( |y| <0.5 ) from 197 Au + 197 Au collisions at sqrt[sNN ]=130 GeV at RHIC. Photon pair conversions were reconstructed from electron and positron tracks measured with the Time Projection Chamber (TPC) of the STAR experiment. With this method, an energy resolution of Delta E/E ~ 2% at 0.5 GeV has been achieved. Reconstructed photons have also been used to measure the transverse momentum ( pt ) spectra of pi 0 mesons about midrapidity ( |y| <1 ) via the pi 0 --> gamma gamma decay channel. The fractional contribution of the pi 0 --> gamma gamma decay to the inclusive photon spectrum decreases by 20%±5% between pt =1.65 GeV/c and pt =2.4 GeV/c in the most central events, indicating that relative to pi 0 --> gamma gamma decay the contribution of other photon sources is substantially increasing.
We report the first observations of the first harmonic (directed flow, v1) and the fourth harmonic (v4), in the azimuthal distribution of particles with respect to the reaction plane in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). Both measurements were done taking advantage of the large elliptic flow (v2) generated at RHIC. From the correlation of v2 with v1 it is determined that v2 is positive, or in-plane. The integrated v4 is about a factor of 10 smaller than v2. For the sixth (v6) and eighth (v8) harmonics upper limits on the magnitudes are reported.
We report on the rapidity and centrality dependence of proton and antiproton transverse mass distributions from 197Au + 197Au collisions at sqrt[sNN ]=130 GeV as measured by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). Our results are from the rapidity and transverse momentum range of |y| <0.5 and 0.35< pt <1.00 GeV/c . For both protons and antiprotons, transverse mass distributions become more convex from peripheral to central collisions demonstrating characteristics of collective expansion. The measured rapidity distributions and the mean transverse momenta versus rapidity are flat within |y| <0.5 . Comparisons of our data with results from model calculations indicate that in order to obtain a consistent picture of the proton (antiproton) yields and transverse mass distributions the possibility of prehadronic collective expansion may have to be taken into account.
The pseudorapidity asymmetry and centrality dependence of charged hadron spectra in d+Au collisions at sqrt[sNN ]=200 GeV are presented. The charged particle density at midrapidity, its pseudorapidity asymmetry, and centrality dependence are reasonably reproduced by a multiphase transport model, by HIJING, and by the latest calculations in a saturation model. Ratios of transverse momentum spectra between backward and forward pseudorapidity are above unity for pT below 5 GeV/c . The ratio of central to peripheral spectra in d+Au collisions shows enhancement at 2< pT <6 GeV/c , with a larger effect at backward rapidity than forward rapidity. Our measurements are in qualitative agreement with gluon saturation and in contrast to calculations based on incoherent multiple partonic scatterings.
Results on high transverse momentum charged particle emission with respect to the reaction plane are presented for Au+Au collisions at sqrt[sNN]=200 GeV. Two- and four-particle correlations results are presented as well as a comparison of azimuthal correlations in Au+Au collisions to those in p+p at the same energy. The elliptic anisotropy v2 is found to reach its maximum at pt~3 GeV/c, then decrease slowly and remain significant up to pt ~ 7-10 GeV/c. Stronger suppression is found in the back-to-back high-pt particle correlations for particles emitted out of plane compared to those emitted in plane. The centrality dependence of v2 at intermediate pt is compared to simple models based on jet quenching.
We report results on rho (770)0--> pi + pi - production at midrapidity in p+p and peripheral Au+Au collisions at sqrt[sNN]=200 GeV. This is the first direct measurement of rho (770)0--> pi + pi - in heavy-ion collisions. The measured rho 0 peak in the invariant mass distribution is shifted by ~40 MeV/c2 in minimum bias p+p interactions and ~70 MeV/c2 in peripheral Au+Au collisions. The rho 0 mass shift is dependent on transverse momentum and multiplicity. The modification of the rho 0 meson mass, width, and shape due to phase space and dynamical effects are discussed.
Azimuthally sensitive Hanbury Brown-Twiss interferometry in Au+Au collisions at sqrt[sNN]=200 GeV
(2004)
We present the results of a systematic study of the shape of the pion distribution in coordinate space at freeze-out in Au+Au collisions at BNL RHIC using two-pion Hanbury Brown-Twiss (HBT) interferometry. Oscillations of the extracted HBT radii versus emission angle indicate sources elongated perpendicular to the reaction plane. The results indicate that the pressure and expansion time of the collision system are not sufficient to completely quench its initial shape.
Transverse mass and rapidity distributions for charged pions, charged kaons, protons, and antiprotons are reported for sqrt[sNN]=200 GeV pp and Au+Au collisions at Relativistic Heary Ion Collider (RHIC). Chemical and kinetic equilibrium model fits to our data reveal strong radial flow and long duration from chemical to kinetic freeze-out in central Au+Au collisions. The chemical freeze-out temperature appears to be independent of initial conditions at RHIC energies.
Measurements of the production of forward high-energy pi 0 mesons from transversely polarized proton collisions at sqrt[s]=200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at xF below about 0.3, and becomes positive and large at higher xF, similar to the trend in data at sqrt[s] <= 20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with pT>1 GeV/c at a polarized proton collider.
We present STAR measurements of the azimuthal anisotropy parameter v2 and the binary-collision scaled centrality ratio RCP for kaons and lambdas ( Lambda + Lambda -bar) at midrapidity in Au+Au collisions at sqrt[sNN]=200 GeV. In combination, the v2 and RCP particle-type dependencies contradict expectations from partonic energy loss followed by standard fragmentation in vacuum. We establish pT ~ 5 GeV/c as the value where the centrality dependent baryon enhancement ends. The K0S and Lambda + Lambda -bar v2 values are consistent with expectations of constituent-quark-number scaling from models of hadron formation by parton coalescence or recombination.
Earlier studies of the seigniorage inflation model have found that the high-inflation steady state is not stable under adaptive learning. We reconsider this issue and analyze the full set of solutions for the linearized model. Our main focus is on stationary hyperinflationary paths near the high-inflation steady state. The hyperinflationary paths are stable under learning if agents can utilize contemporaneous data. However, in an economy populated by a mixture of agents, some of whom only have access to lagged data, stable inflationary paths emerge only if the proportion of agents with access to contemporaneous data is sufficiently high. JEL Klassifikation: C62, D83, D84, E31
We determine optimal monetary policy under commitment in a forwardlooking New Keynesian model when nominal interest rates are bounded below by zero. The lower bound represents an occasionally binding constraint that causes the model and optimal policy to be nonlinear. A calibration to the U.S. economy suggests that policy should reduce nominal interest rates more aggressively than suggested by a model without lower bound. Rational agents anticipate the possibility of reaching the lower bound in the future and this amplifies the effects of adverse shocks well before the bound is reached. While the empirical magnitude of U.S. mark-up shocks seems too small to entail zero nominal interest rates, shocks affecting the natural real interest rate plausibly lead to a binding lower bound. Under optimal policy, however, this occurs quite infrequently and does not require targeting a positive average rate of inflation. Interestingly, the presence of binding real rate shocks alters the policy response to (non-binding) mark-up shocks. JEL Klassifikation: C63, E31, E52 .
In April 2002 the European Central Bank (ECB) and the Center for Financial Studies (CFS) launched the ECB-CFS Research Network to promote research on “Capital Markets and Financial Integration in Europe”. The ECB-CFS research network aims at stimulating top-level and policy-relevant research, significantly contributing to the understanding of the current and future structure and integration of the financial system in Europe and its international linkages with the United States and Japan. This report summarises the work done under the network after two years. Over time the network formed a coherent and growing group of researchers interested in the integration of European financial markets, while using light organisational structures and budgets. The members of this evolving group met repeatedly at the events organised by the network to present the latest results of their research and to share views on policy options. In this sense, the “network of people” intended at the start was created. Overall, the network aroused great interest, as leading academic researchers, researchers from the main policy institutions and high-level policy makers participated actively in it by presenting research results, through speeches and in policy panels. It also stimulated a new research field on securities settlement systems, an area of high policy relevance and interest to the ECB that had not attracted much interest in the research community beforehand. Also, the network seems to have triggered several related outside initiatives by international institutions, such as the IMF or the OECD. During its first two years the network was organised around three workshops and a final symposium on 10-11 May 2004. To focus research resources and to ensure medium-term policy relevance, a limited number of areas have been given top priority: bank competition and the geographical scope of banking; international portfolio choices and asset market linkages between Europe, the United States and Japan; European bond markets; European securities settlement systems; and the emergence and evolution of new markets in Europe (in particular start-up financing markets). In order to stimulate further research focused on the priority fields of the network, the ECB Lamfalussy research fellowships were established. These fellowships sponsor projects proposed by young researchers, both a dvanced doctoral students and younger professors. Five Lamfalussy fellowships were granted in 2003 and five more in 2004. The first papers from this program have already been issued in the ECB working paper series or are forthcoming. One of them won the prize for the best paper written by a Ph.D. student at the 2004 European Finance Association Meetings in Maastricht. Results of the network in the five top priority areas can be summarised as follows: Bank competition and the geographical scope of banking. First, integration does not appear to be very advanced in many retail banking markets. Second, some of the inherent characteristics of traditional loan and deposit business constrain the cross-border expansion of commercial banking, even in a common currency area. Hence, the implementation of some policies to foster cross-border integration in retail banking may be ineffective. Third, theoretical research suggests that supervisory structures may not be neutral towards further European banking integration. Finally, a stronger role of area-wide competition policies could be beneficial for further banking integration. This would also stimulate economic growth, as more competition in the banking sector induces financially dependent firms to grow more. European bond markets. While the government bond market has integrated rapidly with the EMU convergence process, its full integration has not yet been achieved. The introduction of a common electronic trading platform reduced transaction costs substantially, but yield spreads of long-term sovereign bonds of the euro area are still heterogeneous. This is largely explained by different sensitivities to an international risk factor, whereas liquidity differentials only play a role in conjunction with this latter factor. Somewhat surprisingly in this context, the dynamically developing corporate bond market exhibits a relatively high level of integration. There is also increasing evidence that the introduction of the euro has contributed to a reduction in the cost of capital in the euro area, in particular through the reduction of corporate bond underwriting fees. As a result, firms may wish to increase bond financing relative to equity financing. The development of a larger corporate bond market is also important for monetary policy. For example, US evidence suggests that the rating of corporate bonds may contribute to the persistence of recessions, as rating agencies´ policies affect firms asymmetrically in their access to the bond market over the business cycle. US evidence also suggests that liquidity conditions in stock and bond markets tend to be positively correlated. European securities settlement systems. European securities settlement infrastructures are highly fragmented and further integration and/or consolidation would exploit economies of scale that could greatly benefit investors. It is not clear, however, whether direct public intervention in favour of consolidation would lead to the highest level of efficiency, for example because of the existence of strong vertical integration between trading and securities platforms (“silos”). In contrast, promoting open access to clearing and settlement systems could lead to consolidation and the highest level of efficiency. Finally, regarding concerns about unfair practices by Central Securities Depositories (CSDs) toward custodian banks, regulatory interventions favouring custodian banks should be discouraged, as long as CSDs are not allowed to price discriminate between custodian banks and investor banks. The emergence and evolution of new markets in Europe (in particular start-up financing markets). While fairly well integrated, “new markets” and start-up financing are less developed and integrated in Europe than in the United States. However, new markets and venture capitalists are the most important intermediaries for the financing of projects with high risk but with potentially very high return. The analysis carried out within the network reveals that European start-up financiers are mostly institutional investors, while US venture capitalists are mostly rich individuals. Also, new markets are essential for the development of start-up finance in Europe, as they provide an exit strategy for start-up financiers who can then sell new successful projects using initial public offerings. Finally, the legal framework affects the development of venture capital firms. For example, very strict personal bankruptcy laws constrain early stage entrepreneurs, reducing demand for venture capital finance. International portfolio choices and asset market linkages between Europe, the United States and Japan. At a global scale, asset market linkages have increased recently. For example, major economies such as the United States and the euro area have become more financially interdependent. This phenomenon can be observed in stock and bond markets as well as in money markets, where the main direction of spillovers has recently been from the US to the euro area. Country-specific shocks now play a smaller role in explaining stock return variations of firms whose sales are internationally diversified. Increases in firmby-firm market linkages are a global phenomenon, but they are stronger within the euro area than in the rest of the world. Various other phenomena also increase market linkages and therefore the likelihood that financial shocks spread across countries. One example is the use of global bonds. Finally, the nowadays more direct access of unsophisticated investors to financial markets may increase volatility. Other areas. Financial integration affects financial structures, but it does not need to lead to their convergence across countries. Financial structures matter for growth, as market-oriented financial systems benefit all sectors and firms, whereas bank-based systems primarily benefit younger firms that depend on external finance. Moreover, good corporate governance increases firms’ value. In particular, the dual board system, where the monitoring and advising roles of the board of directors are separated, is found to dominate the single board structure. Therefore, the further development of the European single market should strongly require good corporate governance. In general, well designed institutions foster entrepreneurial activity, partly by relaxing capital constraints. The results of the network clearly illustrated the substantial effects the introduction of the euro had on euro area financial markets. In addition to the effects on bond markets, stock markets and the cost of capital summarised above, research produced showed that the single currency had its strongest effects on money markets, whose unsecured segment is now completely integrated. Without any doubt the euro generally enhanced the liquidity and efficiency of euro area financial markets, and ongoing initiatives such as the European Union’s Financial Services Action Plan will help to continue this process. In sum, in the first two years the network has established itself as the hub for the research debate on European financial integration. Some of the best papers produced by the network, leading to the conclusions mentioned above, are currently being considered for publication in two special issues of academic journals. An issue of the Oxford Review of Economic Policy on “European financial integration” is published contemporaneously with this report, and an issue of the Review of Finance is planned for next year. The current policy context, the gradual progress of integration as well as the creation of other related non-ECB or non-CFS initiatives on financial integration suggest that this topic will remain high on the agendas of policy makers and academics for the years to come. Therefore, the ECB Executive Board and the CFS decided to continue the network, refocusing its priorities. Three priority areas have been added: 1) The relationship between financial integration and financial stability, 2) EU accession, financial development and financial integration, and 3) financial system modernisation and economic growth in Europe. These three areas have become particularly important at the current juncture, but have not received particularly strong attention in the first two years of the network. For example, the area of financial stability research was highlighted by the ECB research evaluators as an area deserving further development. Moreover, despite the results found in the first two years of the network, new developments remain to be further explored in the earlier priority areas. A three-year extension is envisaged, running from after the May 2004 symposium until 2007, with two events to be held per year. The threeyear period is long enough to consider the first effects of the Financial Services Action Plan. It also constitutes a realistic horizon for the ambitious agenda implied by the three new priorities. The generally light organisational structure and working of the network will not be changed. In addition, given the value of the Lamfalussy fellowship research program in inducing further research in the areas of the network, the program has also been extended for all the research topics in the area of the network.
Conference Reader zur gemeinsam von Athansios Orphanides (Federal Reserve Board, Washington D.C.), John C. Williams (Federal Reserve Bank of San Francisco), Heinz Hermann (Deutsche Bundesbank), und Volker Wieland (Center for Financial Studies and Goethe University Frankfurt) organisierten Konferenz, die vom 30. - 31. August, 2003 in Eltville stattgefunden hat. Inhaltsverzeichnis: * Volker Wieland (Director Center for Financial Studies): Foreword * Hans Georg Fabritius (Member of the Executive Board of the Deutsche Bundesbank): Opening Remarks * Charles Goodhart (Norman Sosnow Professor of Banking and Finance at the London School of Economics and External Member of the Bank of England's Monetary Policy Commitee): After Dinner Speech * Paper Abstracts * List of Participants
CONTENTS: WHITHER THE SOUTH AFRICAN PUBLISHING INDUSTRY ? 4;
APNET MESSAGE TO AFRICAN PUBLISHERS ON WORLD BOOK DAY 11 ;
FUNDING OPPORTUNITIES FOR OPERATORS IN CULTURE-RELATED INDUSTRIES 13;
4TH SALON INTERNATIONAL DU LIVRE D’ABIDJAN (SILA) 2004 16;
THE NIGERIA INTERNATIONAL BOOK FAIR (NIBF) 2004 20;
THE NOMA AWARD 2003 PRESENTATION 22;
A NEW CONSULTANCY FIRM IS FORMED 27;
EDILIS HOLD DEDICATION CEREMONY 30;
LETTERS TO THE EDITOR 34;
NEWS FROM PARTNER ORGANISATIONS 41;
NOTICE 44;
PROMOTIONS 50
The papers in this volume were presented at the eleventh meeting of the Austronesian Formal Linguistics Association (AFLA 11), held from April 23-25 at the Zentrum für Allgemeine Sprachwissenschaft, Berlin, Germany. The conference was organized by Hans-Martin Gärtner, Joachim Sabel, and myself, as part of the research project Clause Structure and Adjuncts in Austronesian Languages. We gratefully acknowledge the financial support by the German Research Foundation (Deutsche Forschungsgemeinschaft). We would like to thank Wayan Arka, Agibail Cohn, Laura Downing, Silke Hamann, S J Hannahs, Ray Harlow, Nikolaus Himmelmann, Yuchua E. Hsiao, Lillian Huang, Ed Keenan, Glyne Piggott, Charles Randriamasimanana, Joszef Szakos, Barbara Stiebels, Jane Tang, Lisa Travis, Noami Tsukido, Sam Wang, Elizabeth Zeitoun, Kie Ross Zuraw, and Marzena Zygis for reviewing the abstracts. We are thankful to Mechthild Bernhard, Jenny Ehrhardt, Fabienne Fritzsche, Theódóra Torfadóttir and Tue Trinh for their help during the conference. I would like to thank Theódóra for providing essential editorial assistance.
Table of Contents:
T. A. Hall (Indiana University): English syllabification as the interaction of markedness constraints
Antony D. Green: Opacity in Tiberian Hebrew: Morphology, not phonology
Sabine Zerbian (ZAS Berlin): Phonological Phrases in Xhosa (Southern Bantu)
Laura J. Downing (ZAS Berlin): What African Languages Tell Us About Accent Typology
Marzena Zygis (ZAS Berlin): (Un)markedness of trills: the case of Slavic r-palatalisation
Laura J. Downing (ZAS Berlin), Al Mtenje (University of Malawi), Bernd Pompino-Marschall (Humboldt-Universitat Berlin): Prosody and Information Structure in Chichewa
T. A. Hall (Indiana University). Silke Hamann (ZAS Berlin), Marzena Zygis (ZAS Berlin): The phonetics of stop assibilation
Christian Geng (ZAS Berlin), Christine Mooshammer (Universitat Kiel): The Hungarian palatal stop: phonological considerations and phonetic data
The volume is a collection of papers given at the conference “sub8 -- Sinn und Bedeutung”, the eighth annual conference of the Gesellschaft für Semantik, held at the Johann-Wolfgang-Goethe-Universität, Frankfurt (Germany) in September 2003. During this conference, experts presented and discussed various aspects of semantics. The very different topics included in this book provide insight into fields of ongoing Semantics research.
The papers of this 33th volume of the ZAS Papers in Linguistics present intermediate results of the ZAS-project on language acquisition. Currently we deal with the question of which functions children assign to the first grammatical forms they use productively. The goal is to identify grammatical features comprising the child's early grammar. This issue is investigated within the analyses of longitudinal data (cf. the papers of Gagarina/Bittner, Gagarina, Kühnast/Popova/Popov, Bewer) as well as within experimental research (see the papers of Bittner, Kühnast/Popova/Popov). The main topic of this volume is the acquisition of definite articles and verbal aspect.
Bewer – who has worked as a student assistant in the project for a long time and wrote her MA-thesis on the topic of the project – investigates children's acquisition of gender features in German. Kühnast/Popova/Popov discuss the correlations between the acquisition of definite articles and verbal aspect in Bulgarian. Bittner presents results of an experimental study on definite article perception in adult German. Gagarina traces the emergence of aspectual oppositions in Russian and examines the validity of the 'aspect before tense' hypothesis for L1-speaking children. Additionally, the paper of Gagarina/Bittner deals with the interrelation between the acquisition of finiteness and verb arguments in Russian and German.
After this issue you will have a new editor at the helm: Dr Volker Framenau. As you have been reading in the newsletters Volker has a background in both taxonomy and ecology. A network across both disciplines should help keep us well informed of the latest news and research within the region. Volker is very enthusiastic about the society and I encourage members to keep supporting the newsletter by sending him your articles. Volker has been helping me develop the webpage so that will continue to evolve.
This is it, my first issue! As
Tracey announced in the editorial of the
last Australasian Arachnology, it’s now my
turn ‘at the helm’ of our newsletter.
Everybody will agree that Tracey did a
tremendous job over the last five years,
editing 15 wonderful issues (numbers 55
– 69). Parallels of the current change to
her take-over from Mark Harvey as
previous editor are evident. As then Mark,
Tracey embraces a new role as parent
and her increasing family duties do not
allow as many arachnological activities at
this stage.
Criminology in Africa
(2004)
Criminology in Africa has been produced with contributions from leading African authors who have focussed on the various problems facing Africa today regarding crime and criminal justice, and they have, at the same time, put forward their ideas and suggestions for coming to terms with these massive problems.
Part One addresses Theological Foundations. The five essays in this section deal with the Bible, Theology and Ecumenism. The subjects of theological methods, contextual hermeneutics, and appropriate curriculum are given special attention. Of course even foundational issues cannot be discussed in a vacuum and so each of the essays addresses these foundational subjects in the light of African realities. Part Two deals with Contemporary Issues. It is particularly in this section that the traditional themes in African theology have been somewhat displaced by concerns which are today very pressing indeed. Three essays are devoted to the question of HIV/AIDS. This disease, which has devastated the African continent, demands a theological and practical response from those who claim to follow Jesus Christ. If the churches do not respond to this crisis with energy and determination we should not be surprised if the next generation wonders whether the Gospel has the power which we claim that it has. Two essays address the question of Islam and Muslim-Christian Relations in Africa. The resurgence of Islam in the world today is a concern of many. For those who believe in Jesus, this is a challenge which demands much wisdom and love. How should we respond to our Muslim neighbours? What are appropriate and thoughtful ways to share the love of Christ? Two further essays appear under the title of The Marginalized. This could, of course, be a much large section. Those who suffer from AIDS could be included in this number, and one might have expected to see at least one essay on the place of women. In this volume, however, the disabled and youth are highlighted. Both groups are clearly in need of the attention of the churches, and both groups are clearly misunderstood and neglected. The final section of Part Two contains essays, which focus attention on Theological Paedagogy. All of the other contributions to this volume make suggestions and arguments about curriculum, resources, and issues of concern for theological educators. The causal aim of this book is that these essays may help us to reflect in an intentional way on the implications of contemporary realities for the future of theological education.
IAD annual report 2004
(2004)
Das E-Finance Lab publiziert jeweils quartalsweise einen digitalen sowie einen gedruckten Newsletter, die abwechselnd alle sechs Wochen erscheinen. Der digitale Newsletter gibt einen kurzen Überblick über ausgewählte Forschungsarbeiten und nutzt den Einsatz von Hyperlinks zu weiterführenden Informationen. s. http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hebis:30:3-15886 . Der gedruckte Newsletter "EFL quarterly : an E-Finance Lab publication" hingegen beschreibt kompakt und ergebnisorientiert einzelne Forschungsprojekte.