136 research outputs found
Complete O(alpha_s^2) Corrections to (2+1) Jet Cross Sections in Deep Inelastic Scattering
Complete next-to leading order QCD predictions for (2+1) jet cross sections
and jet rates in deep inelastic scattering (DIS) based on a new parton level
Monte Carlo program are presented. All relevant helicity contributions to the
total cross section are included. Results on total jet cross sections as well
as differential distributions in the basic kinematical variables and
are shown for HERA energies and for the fixed target experiment E665 at
FERMILAB. We study the dependence on the choices of the renormalization scale
and the factorization scale and show that the NLO results are
much less sensitive to the variation of than the LO results.
The effect of an additional cut to our jet definition scheme is
investigated.Comment: 14 pages, LateX, MAD/PH/821, 15 figures (not included), figures are
available upon request. (some essential changes to the figures, minor changes
to the text). To appear in Z.Phys.
MobilityGraphs: Visual Analysis of Mass Mobility Dynamics via Spatio-Temporal Graphs and Clustering
Learning more about people mobility is an important task for official decision makers and urban planners. Mobility data sets characterize the variation of the presence of people in different places over time as well as movements (or flows) of people between the places. The analysis of mobility data is challenging due to the need to analyze and compare spatial situations (i.e., presence and flows of people at certain time moments) and to gain an understanding of the spatio-temporal changes (variations of situations over time). Traditional flow visualizations usually fail due to massive clutter. Modern approaches offer limited support for investigating the complex variation of the movements over longer time periods
Next-to-Leading Order QCD Corrections to Jet Cross Sections and Jet Rates in Deeply Inelastic Electron Proton Scattering
Jet cross sections in deeply inelastic scattering in the case of transverse
photon exchange for the production of (1+1) and (2+1) jets are calculated in
next-to-leading order QCD (here the `+1' stands for the target remnant jet,
which is included in the jet definition for reasons that will become clear in
the main text). The jet definition scheme is based on a modified JADE cluster
algorithm. The calculation of the (2+1) jet cross section is described in
detail. Results for the virtual corrections as well as for the real initial-
and final state corrections are given explicitly. Numerical results are stated
for jet cross sections as well as for the ratio \sigma_{\mbox{\small (2+1)
jet}}/\sigma_{\mbox{\small tot}} that can be expected at E665 and HERA.
Furthermore the scale ambiguity of the calculated jet cross sections is studied
and different parton density parametrizations are compared.Comment: 40 pages, LBL-34147 (Latex file). (figures available by mail on
request (send e-mail to [email protected]), please include your address
such that it can be used as an address label
Influence of Chaperone-Like Activity of Caseinomacropeptide on the Gelation Behaviour of Whey Proteins at pH 6.4 and 7.2
The effect of caseinomacropeptide (CMP) on the heat-induced denaturation and gelation of whey proteins (2.5â10%, w/v) at pH 6.4 and 7.2, at a whey protein:CMP ratio of 1:0.9 (w/w), was investigated using differential scanning calorimetry (DSC), oscillatory rheology (90 °C for 20 min) and confocal microscopy. Greater frequency-dependence in the presence of CMP suggested that the repulsive interactions between CMP and the whey proteins affected the network generated by the non-heated whey protein samples. At pH 6.4 or 7.2, CMP increased the temperature of denaturation of ÎČ-lactoglobulin by up to 3 °C and increased the gelation temperature by up to 7 °C. The inclusion of CMP strongly affected the structure of the heat-induced whey protein gels, resulting in a finer stranded structure at pH 6.4 and 7.2. The presence of CMP combined with a lower heating rate (2 °C/min) prevented the formation of a solid gel of whey proteins after heating for 20 min at 90 °C and at pH 7.2. These results show the potential of CMP for control of whey protein denaturation and gelation
Renormalization scale uncertainty in tne DIS 2+1 jet cross-section
The deep inelastic scattering 2+1 jet cross- section is a useful observable
for precision tests of QCD, e.g. measuring the strong coupling constant
alpha(s). A consistent analysis requires a good understanding of the
theoretical uncertainties and one of the most fundamental ones in QCD is due to
the renormalization scheme and scale ambiguity. Different methods, which have
been proposed to resolve the scale ambiguity, are applied to the 2+1 jet
cross-section and the uncertainty is estimated. It is shown that the
uncertainty can be made smaller by choosing the jet definition in a suitable
way.Comment: 24 pages, uuencoded compressed tar file, DESY 94-082, TSL-ISV-94-009
Analyticity, crossing and the absorptive parts of the one-loop contributions to the quark-quark-gluon gauge boson four-point function
Starting from the known one-loop result for the -annihilation
process with
massless quarks we employ analyticity and crossing to determine the absorptive
parts of the corresponding one-loop contributions in Deep Inelastic Scattering
(DIS) and in the Drell-Yan process (DY). Whereas the
absorptive parts generate a non-measurable phase factor in the
-annihilation channel one obtains measurable phase effects from the
one-loop contributions in the deep inelastic and in the Drell-Yan case. We
compare our results with the results of previous calculations where the
absorptive parts in DIS and in the DY process were calculated directly in the
respective channels. We also present some new results on the dispersive and
absorptive contributions of the triangle anomaly graph to the DIS process.Comment: 23 pages, 5 figures, typos corrected. Version to appear in Phys. Rev.
Standard Model Large-E_T Processes and Searches for New Physics at HERA
Existing and missing calculations of standard model processes producing large
transverse energy in electron-proton interactions at HERA are reviewed. The
adequacy of the existing standard model Monte Carlo programs for generic
searches of exotic processes is analyzed.Comment: 9 pages, LaTeX, uses iop style files, Contribution to the 3rd UK
Phenomenology Workshop on HERA Physics, September 1998, Durha
A standardised static in vitro digestion method suitable for food â an international consensus
peer-reviewedSimulated gastro-intestinal digestion is widely employed in many fields of food and nutritional sciences, as conducting human trials are often costly, resource intensive, and ethically disputable. As a consequence, in
vitro alternatives that determine endpoints such as the bioaccessibility of nutrients and non-nutrients or the
digestibility of macronutrients (e.g. lipids, proteins and carbohydrates) are used for screening and building
new hypotheses. Various digestion models have been proposed, often impeding the possibility to compare
results across research teams. For example, a large variety of enzymes from different sources such as of
porcine, rabbit or human origin have been used, differing in their activity and characterization. Differences in
pH, mineral type, ionic strength and digestion time, which alter enzyme activity and other phenomena, may
also considerably alter results. Other parameters such as the presence of phospholipids, individual enzymes
such as gastric lipase and digestive emulsifiers vs. their mixtures (e.g. pancreatin and bile salts), and the ratio
of food bolus to digestive fluids, have also been discussed at length. In the present consensus paper, within
the COST Infogest network, we propose a general standardised and practical static digestion method based
on physiologically relevant conditions that can be applied for various endpoints, which may be amended to
accommodate further specific requirements. A frameset of parameters including the oral, gastric and small
intestinal digestion are outlined and their relevance discussed in relation to available in vivo data and
enzymes. This consensus paper will give a detailed protocol and a line-by-line, guidance, recommendations
and justifications but also limitation of the proposed model. This harmonised static, in vitro digestion method
for food should aid the production of more comparable data in the future.COST action FA1005 Infogest22 (http://www.cost-infogest.eu/) is acknowledged for providing funding for travel, meetings and conferences
The Origin and Genetic Variation of Domestic Chickens with Special Reference to Junglefowls Gallus g. gallus and G. varius
It is postulated that chickens (Gallus gallus domesticus) became domesticated from wild junglefowls in Southeast Asia nearly 10,000 years ago. Based on 19 individual samples covering various chicken breeds, red junglefowl (G. g. gallus), and green junglefowl (G. varius), we address the origin of domestic chickens, the relative roles of ancestral polymorphisms and introgression, and the effects of artificial selection on the domestic chicken genome. DNA sequences from 30 introns at 25 nuclear loci are determined for both diploid chromosomes from a majority of samples. The phylogenetic analysis shows that the DNA sequences of chickens, red and green junglefowls formed reciprocally monophyletic clusters. The Markov chain Monte Carlo simulation further reveals that domestic chickens diverged from red junglefowl 58,000±16,000 years ago, well before the archeological dating of domestication, and that their common ancestor in turn diverged from green junglefowl 3.6 million years ago. Several shared haplotypes nonetheless found between green junglefowl and chickens are attributed to recent unidirectional introgression of chickens into green junglefowl. Shared haplotypes are more frequently found between red junglefowl and chickens, which are attributed to both introgression and ancestral polymorphisms. Within each chicken breed, there is an excess of homozygosity, but there is no significant reduction in the nucleotide diversity. Phenotypic modifications of chicken breeds as a result of artificial selection appear to stem from ancestral polymorphisms at a limited number of genetic loci
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