Search results for " TAU"
showing 10 items of 636 documents
Stereoelectronic Requirements for Optimal Hydrogen-Bond-Catalyzed Enolization
2011
Protein crystallographic analysis of the active sites of enolizing enzymes and structural analysis of hydrogen-bonded carbonyl compounds in small molecule crystal structures, complemented by quantum chemical calculations on related model enolization reactions, suggest a new stereoelectronic model that accounts for the observed out-of-plane orientation of hydrogen-bond donors (HBDs) in the oxyanion holes of enolizing enzymes. The computational results reveal that the lone-pair directionality of HBDs characteristic for hydrogen-bonded carbonyls is reduced upon enolization, and the enolate displays almost no directional preference for hydrogen bonding. Positioning the HBDs perpendicular to the…
Everything matters: Molar microwear texture in goats (Capra aegagrus hircus) fed diets of different abrasiveness
2020
There is an ongoing discourse about whether or not external abrasives influence the microscopic wear in herbivore teeth, including a statement that “dust does not matter”. We submitted the maxillary and mandibular second molar of 28 goats (Capra aegagrus hircus) to dental microwear texture analysis (DMTA). The study animals were divided into four groups, which received diets of increasing phytolith-based abrasiveness (L: lucerne based pellets, very low phytolith abrasion diet, acting as control; G: grass-based pellets, medium abrasive phytolith diet; GR: grass and rice husk pellets, high abrasion phytolith diet), or a diet with added external abrasives (GRS: the GR diet with add…
Evaluation of ergonomic factors and postures that cause muscle pains in dentistry students’ bodies
2015
Background: Work-related musculoskeletal disorders commonly experienced by dental professionals are one of the main occupational health problem affecting their health and well-being.This study was conducted to evaluate ergonomic factors and profession-related postures and also investigate relationship between demographic factors and work condition with pain in dental students. Material and Methods: 60 freshman and sophomore dentistry students were randomly chosen as the subjects of control group, and 60 of 5th and 6th-year students were selected as the members of exposure group. Data related to the subjects such as sex, doing exercise, severity of musculoskeletal pain were obtained through …
Latviešu tautas rakstu izmantošana reklāmā
2019
Bakalaura darbā tiek pētīti jautājumi par kultūrvērtību un datorprogrammām, ar kurām ērtāk un veiksmīgāk veidot jaunus ornamentus un rakstus, izvērtēti pirmie latviešu tautas rakstu un ornamentu pētnieki un viņu devums etnogrāfijas nozarē, veikta aptauja, lai noskaidrotu populārākos un atpazīstamākos latviešu tautas rakstus, noskaidrots, kā latviešu tautas raksti tiek izmantoti reklāmā. Radošais darbs – Bērnu deju ansambļa “Dzīpariņš” 25 gadu jubilejas koncerta afiša, buklets un scenogrāfija. Rezultātā iegūtas atziņas, ka latviešu tautai ir savi tautas raksti, latvju zīmes, kas norāda uz piederību šai valstij, ka vispopulārākās un atpazīstamākās zīmes ir Jumis, Auseklis un Saules zīme, ka l…
Latviešu tautasdziesmas kā pirmsskolas vecuma bērnu muzikālās dzirdes un balss attīstīšanas līdzeklis
1995
Le contrôle des risques bancaires. Une approche historique des enjeux et des résistances lors du changement de référentiel comptable de 2005.
2023
Ce chapitre analyse pourquoi et comment l'adoption des normes comptables internationales dans leur forme initiale aurait conduit à une remise en cause de la pratique de la macro-couverture utilisée par les grandes banques françaises pour gérer leur risque de taux. Plus largement il étudie en quoi cette remise en cause était susceptible d'avoir une incidence sur leur modèle économique et leur politique de crédit ainsi que les résistances, notamment politiques, qui ont été à l'œuvre
A Precise Measurement of the Tau Lepton Lifetime
1996
The tau lepton lifetime has been measured using three different methods with the DELPHI detector. Two measurements of one-prong decays are combined, accounting for correlations, giving a result of \tau_\tau = 291.8 \pm 3.3 \mbox{ (stat.)} \pm 2.0 \mbox{(sys.) fs} while the decay length distribution of three-prong decays gives the result \tau_{\tau} = 286.7 \pm 4.9 \mbox{ (stat.)} \pm 3.3 \mbox{ (sys.) fs}. Combining the results presented here with previous DELPHI measurements, we get \tau_{\tau} = 291.4 \pm 3.0 fs and find that the ratio of the coupling constant for tau decay relative to that for muon decay is 0.990 \pm 0.009, compatible with lepton universality.
Search for events with large missing transverse momentum, jets, and at least two tau leptons in 7 TeV proton–proton collision data with the ATLAS det…
2012
A search for events with large missing transverse momentum, jets, and at least two tau leptons has been performed using 2 fb[superscript −1] of proton–proton collision data at √s = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95% CL upper limit on the visible cross section for new phenomena is set, where the visible cross section is defined by the product of cross section, branching fraction, detector acceptance and event selection efficiency. A 95% CL lower limit of 32 TeV is set on the gauge-mediated supersymmetry breaking (GMSB) scale Λ independent of tan β. These limits provide the most s…
Limits on tau lepton-flavor violating decays into three charged leptons
2010
A search for the neutrinoless, lepton-flavor violating decay of the tau lepton into three charged leptons has been performed using an integrated luminosity of 468 fb(-1) collected with the BABAR detector at the PEP-II collider. In all six decay modes considered, the numbers of events found in data are compatible with the background expectations. Upper limits on the branching fractions are set in the range (1.8-3.3) x 10(-8) at 90% confidence level.
A measurement of the \(\tau\) leptonic branching fractions
1995
Abstract: A sample of 25000 Z(0) --> tau(-)tau(+) events collected by the DELPHI experiment at LEP in 1991 and 1992 is used to measure the leptonic branching fractions of the tau lepton. The results are B(tau --> e nu) = (17.51+/-0.39)% and B(tau --> mu nu) = (17.02+/-0.31)%. The ratio of the muon and electron couplings to the weak charged current is measured to be g(mu)/g(e) = 1.000+/-0.013, satisfying e-mu universality. The average leptonic branching fraction corrected to the value for a massless lepton, assuming e-mu universality, is found to be B(tau --> l nu) = (17.50+/-0.25)%.