However, for systems such as hydro turbine generating sets (HTGS) where the control and regulation is frequently applied, the shafting safety and stabilization in transient state is then a key factor. The shafting transient state inevitably involves multi-parameter domain, multi-field coupling and coupling dynamics. In this paper, the relative value form of the Lagrange function and its equations have been established by defining the base value system of the shafting. Taking the rotation angle and the angular speed of the shafting as a link, the shafting lateral vibration and generator equations are integrated into the framework of the generalized Hamiltonian system. The generalized Hamiltonian control model is thus established. To make the model be more general, additional forces of the shafting are taken as the input excitation in proposed model. The control system of the HTGS can be easily connected with the shafting model to form the whole simulation system of the HTGS. It is expected that this study will build a foundation for the coupling dynamics theory using the generalized Hamiltonian theory to investigate coupling dynamic mechanism between the shafting vibration, transient of hydro turbine generating sets and additional forces of the shafting.
We present a measurement of the ratio of the top-quark branching fractions R = B(t → W b)/B(t → W q), where q represents quarks of type b, s, or d, in the final state with a lepton and hadronic jets. The measurement uses √ s = 1.96 TeV proton-antiproton collision data from 8.7 fb −1 of integrated luminosity collected with the Collider Detector at Fermilab during Run II of the Tevatron. We simultaneously measure R = 0.94±0.09 (stat+syst) and the tt production cross section σ tt = 7.5±1.0 (stat+syst) pb. The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, |V tb | = 0.97 ± 0.05 (stat+syst) is extracted assuming three generations of quarks, and a lower limit of |V tb | > 0.89 at 95% credibility level is set.PACS numbers: 12.15. Hh, 13.85.Qk, 14.65.Ha In the standard model (SM) the top-quark decay rate into a W boson and a down-type quark q (q = d, s, b) is proportional to |V tq | 2 , the squared magnitude of the element of the Cabibbo-Kobayashi-Maskawa (CKM) ma- * Deceased † With visitors from
Based on a sample of 1.31 × 10 9 J=ψ events collected with the BESIII detector, the matrix elements for the decays η 0 → ηπ þ π − and η 0 → ηπ 0 π 0 are determined using 351,016 η 0 → ðη → γγÞπ þ π − and 56,249 η 0 → ðη → γγÞπ 0 π 0 events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between η 0 → ηπ þ π − and η 0 → ηπ 0 π 0 is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in η 0 → ηπ 0 π 0 is observed.
Using data from 2:9 fb À1 of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We observed no statistically significant excess above the expected standard model background, and we set cross section limits at 95% confidence level on G Ã (Randall-Sundrum graviton), Z 0 , and W 0 bosons. By comparing these limits to theoretical cross sections, mass exclusion regions for the three particles are derived. The mass exclusion regions for Z 0 and W 0 are further evaluated as a function of their gauge coupling strength.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.