202,625 research outputs found
Moment estimators of the extreme value index for randomly censored data in the Weibull domain of attraction
This paper addresses the problem of estimating the extreme value index in
presence of random censoring for distributions in the Weibull domain of
attraction. The methodologies introduced in [Worms (2014)], in the heavy-tailed
case, are adapted here to the negative extreme value index framework, leading
to the definition of weighted versions of the popular moments of relative
excesses with arbitrary exponent. This leads to the definition of two families
of estimators (with an adaptation of the so called Moment estimator as a
particular case), for which the consistency is proved under a first order
condition. Illustration of their performance, issued from an extensive
simulation study, are provided
A Lynden-Bell integral estimator for extremes of randomly truncated data
This work deals with the estimation of the extreme value index and extreme
quantiles for heavy tailed data,randomly right truncated by another heavy
tailed variable. Under mild assumptions and the condition thatthe truncated
variable is less heavy-tailed than the truncating variable, asymptotic
normality is proved for bothestimators. The proposed estimator of the extreme
value index is an adaptation of the Hill estimator, in thenatural form of a
Lynden-Bell integral. Simulations illustrate the quality of the estimators
under a variety ofsituations
Effects of curative treatment emphasizing endurance training on the performance and blood pressure of hypertensive and normotensives
The problem of normal values of blood pressure after exercise taking into account the blood pressure at the end of the exercise test is discussed. Hypertensives showed a lower working capacity than normotensives. In normotensives, however, systolic blood pressure at the end of an exercise correlated well with the working capacity. After the endurance cure submaximal blood pressure was markedly lower in hypertensives with a striking dependence on the level of initial values. Systolic blood pressure at the end of an exercise test was not changed significantly. Most probably it is not possible to overcome this malregulation in hypertensives by endurance training alone
The reaction of bank lending to monetary policy measures in Germany
A crucial condition for the existence of a credit channel through bank loans is that monetary policy should be able to change bank loan supply. This paper contributes to the discussion on this issue by presenting empirical evidence from dynamic panel estimations based on a dataset that comprises individual balance sheet information on all German banks. It shows that the average bank reduces its lending more sharply in reaction to a restrictive monetary policy measure the lower its ratio of short-term interbank deposits to total assets. A dependence on its size can only be found if explicitly controlled for this dominating effect and/or if the very small banks are excluded. Overall, the evidence is compatible with the existence of a credit channel JEL Classification: C23, E52, G21credit channel, dynamic panel data, financial structure, Monetary policy transmission
Modulation of Localized States in Electroconvection
We report on the effects of temporal modulation of the driving force on a
particular class of localized states, known as worms, that have been observed
in electroconvection in nematic liquid crystals. The worms consist of the
superposition of traveling waves and have been observed to have unique, small
widths, but to vary in length. The transition from the pure conduction state to
worms occurs via a backward bifurcation. A possible explanation of the
formation of the worms has been given in terms of coupled amplitude equations.
Because the worms consist of the superposition of traveling waves, temporal
modulation of the control parameter is a useful probe of the dynamics of the
system. We observe that temporal modulation increases the average length of the
worms and stabilizes worms below the transition point in the absence of
modulation.Comment: 4 pages, 4 figure
Transparency in monetary policy
For some time now the buzzword 'transparency' has been bandied about in the media almost daily. For example, calls were made for greater transparency in the financial system in connection with developments in the Asian financial markets. But the call for greater transparency goes far beyond the financial markets. It is now regarded as a necessary part of "good governance" demanded of all economic policy makers. As the World Bank's chief economist Joseph Stiglitz put it: 'No one would dare say that they were against transparency (....): It would be like saying you were against motherhood or apple pie.' This paper focuses on transparency in monetary policy, in particular with respect to the European System of Central Bank
Comparative genetic resistance to Ascaridia galli infections of 4 different commercial layer-lines
1. The objective of the study was to compare the establishment and effect of Ascaridia galli infections in 4 different layer-lines.
2. A total of 160 birds comprising 4 different commercial layer-lines, ISA Brown, New Hampshire, Skalborg and a cross of New Hampshire(NH) and Skalborg (Sk), were infected with A. galli eggs. The birds were examined for the presence of parasite eggs and parasites at weeks 3, 6 and 9 post infection (pi).
3. At week 6 pi the chickens of the NH line harboured more larvae compared with the three other lines. The Sk line chickens excreted more A. galli eggs throughout the study compared with the other lines. Female worms in the Sk line were more fecund than the worms in the other lines. Male and female worms recovered from the Sk line at week 9 pi were longer. Male worms recovered from the NH line 6 weeks pi were shorter than male worms from the other lines. Female worms recovered from the NH line were shorter than the female worms from the ISA line and the Sk line. No differences were seen
in weight gain among the 4 lines.
4. The results suggest that genetic factors are involved in the establishment and survival of A. galli in the intestine of layers. Further studies are needed to elucidate the genetic mechanisms behind the observed parasitological findings
Electro-worming: The Behaviors of Caenorhabditis (C.) elegans in DC and AC Electric Fields
The video showcases how C. elegans worms respond to DC and AC electrical
stimulations. Gabel et al (2007) demonstrated that in the presence of DC and
low frequency AC fields, worms of stage L2 and larger propel themselves towards
the cathode. Rezai et al (2010) have demonstrated that this phenomenon, dubbed
electrotaxis, can be used to control the motion of worms. In the video, we
reproduce Rezai's experimental results. Furthermore, we show, for the first
time, that worms can be trapped with high frequency, nonuniform electric
fields. We studied the effect of the electric field on the nematode as a
function of field intensity and frequency and identified a range of electric
field intensities and frequencies that trap worms without apparent adverse
effect on their viability. Worms tethered by dielectrophoresis (DEP) avoid blue
light, indicating that at least some of the nervous system functions remain
unimpaired in the presence of the electric field. DEP is useful to dynamically
confine nematodes for observations, sort them according to size, and separate
dead worms from live ones.Comment: Two videos are included. The videos have been uploaded on
eCommons@Cornell. The link address is as follow:
http://ecommons.library.cornell.edu/handle/1813/1410
Preventing and Controlling: Internal Parasites of Hogs
CONTENTS
Damage..... 3
Spread........ 4
Prevention and Control.......... 4
Housing and pasture............. 5
Separation from older hogs..... 5
Swine-sanitation system....... 5
Treatment........ 7
Roundworms................. 8
The large intestinal round-worm, or ascarid......... 8
Stomach worms.......... 12
The intestinal threadworm..... 13
The swine kidney worm......... 13
Lung worms............ 17
Nodular worms......... 20
The whipworm.......... 2
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