97,140 research outputs found
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Podocinum tibetensis Yan, Jin, Wu, Guo & Guo 2012
No full text36. Podocinum tibetensis Yan, Jin, Wu, Guo & Guo, 2012 Podocinum tibetensis Yan, Jin, Wu, Guo & Guo, 2012: 36. Type depository. Institute of Entomology, Guizhou University, Guiyang, China. Type locality and habitat. China, Bome County (29°53’ N, 95°40’ E; alt. 2726 m), Nyingchi, Tibet Autonomous Region, 25 August 2010, in litter under pine tree.Published as part of Barros, Avyla R. A., Castilho, Raphael C. & De Moraes, Gilberto J., 2020, Catalogue of the mite family Podocinidae Berlese (Acari: Mesostigmata), pp. 141-156 in Zootaxa 4802 (1) on page 153, DOI: 10.11646/zootaxa.4802.1.9, http://zenodo.org/record/390496
Asca idiobasis Gu & Guo 1997
No full textAsca idiobasis Gu & Guo , 1997 Asca idiobasis Gu & Guo, 1997: 147. Asca idiobasis.— Ma, 2005 c: 540. TYPE DEPOSITORY: Department of Parasitology, Medical School, Nanjing University, Nanjing, China. TYPE LOCALITY AND HABITAT: Xiaguan, Yunnan, China, on Eothenomys miletus [Animalia: Cricetidae].Published as part of De Moraes, Gilberto J., Britto, Erika P. J., Mineiro, Jefferson L. De C. & Halliday, Bruce, 2016, Catalogue of the mite families Ascidae Voigts & Oudemans, Blattisociidae Garman and Melicharidae Hirschmann (Acari: Mesostigmata), pp. 1-299 in Zootaxa 4112 (1) on page 96, DOI: 10.11646/zootaxa.4112.1.1, http://zenodo.org/record/39947
Kinematic Simulation and Structure Analysis of a Morphing Flap
No full textThis thesis presents a study on the design and analysis of a morphing flap
structure integrated with actuation mechanism for potential application to large
aircraft. Unlike the conventional rigid flap mounted on the wing trailing edge,
the morphing flap is designed as a unitized structural system integrated with
three primary components: the upper and lower flexible skins reinforced by
stringers, an eccentric beam actuation mechanism (EBAM) with discs fixed on it,
and the connection of the discs with the stringers. Based on the EBAM concept
proposed by Dr Guo in previous research [1], the current study has been
focused on the EBAM design and optimization, kinematic simulation and
structural modelling of the morphing flap.
Although a lot of efforts have been made to develop the morphing flap in
previous research, it is lack of detailed design of the disc-skin linkage and clear
view on the mechanism optimization in relation to the shape requirement. The
main objective of this research is to meet the morphing shape requirements and
calculate the actuation torque for a specified morphing flap. Firstly effort was
made to design and optimize the disc shape and locations in the EBAM for the
best matching of the specified morphing shape with minimum actuation torque
demand. It is found that minimum three discs are required and their locations
have little effect on the actuation torque. Secondly attention was focused on
designs of the disc and a C-linkage with the stringers. To ensure that the C-
linkage works in practice, a twisted stringer flange design was proposed. Thirdly
the actuation mechanism was integrated with the stiffened skin to play the role
of an active rib in the flap structure. Based on the design, FE modelling and
analysis of the morphing flap structure was carried out. The behaviour of the
morphing flap under the internal actuation and external aerodynamic load was
applied for stress analysis and detailed design of the structures. Finally the
kinematics of the integrated morphing flap was simulated by using CATIA to
demonstrate the feasibility and the effectiveness of the improved design
Lasioseius medius Gu & Guo 1994
No full textLasioseius medius Gu & Guo , 1994 Lasioseius medius Gu & Guo, 1994: 87. Lasioseius (Cuspiacus) medius.— Christian & Karg, 2006: 235. Lasioseius medius.— Zhang & Fan, 2010: 283. TYPE DEPOSITORY: Department of Parasitology, Medical School, Nanjing University, Nanjing, China. TYPE LOCALITY AND HABITAT: Xiaguan, Yunnan, China, on Rattus nitidus [Animalia: Muridae].Published as part of De Moraes, Gilberto J., Britto, Erika P. J., Mineiro, Jefferson L. De C. & Halliday, Bruce, 2016, Catalogue of the mite families Ascidae Voigts & Oudemans, Blattisociidae Garman and Melicharidae Hirschmann (Acari: Mesostigmata), pp. 1-299 in Zootaxa 4112 (1) on page 175, DOI: 10.11646/zootaxa.4112.1.1, http://zenodo.org/record/39947
Lasioseius praevius Gu & Guo 1994
No full textLasioseius praevius Gu & Guo , 1994 Lasioseius praevius Gu & Guo, 1994: 87 Lasioseius (Cuspiacus) praevius.— Christian & Karg, 2006: 236. Lasioseius praevius.— Zhang & Fan, 2010: 283. TYPE DEPOSITORY: Department of Parasitology, Medical School, Nanjing University, Nanjing, China. TYPE LOCALITY AND HABITAT: Xiaguan, Yuinnan, China, on Crocidura attenuata [Animalia: Soricidae].Published as part of De Moraes, Gilberto J., Britto, Erika P. J., Mineiro, Jefferson L. De C. & Halliday, Bruce, 2016, Catalogue of the mite families Ascidae Voigts & Oudemans, Blattisociidae Garman and Melicharidae Hirschmann (Acari: Mesostigmata), pp. 1-299 in Zootaxa 4112 (1) on page 182, DOI: 10.11646/zootaxa.4112.1.1, http://zenodo.org/record/39947
Verification of C-detectability using Petri nets
No full textDetectability describes the property of a system to uniquely determine, after a finite number of observations, the current and the subsequent states. In this paper, we extend detectability to C-detectability that only requires that a given set of crucial states can be distinguished from other states. We define four types of C-detectability in the framework of labeled Petri nets: strong C-detectability, weak C-detectability, periodically strong C-detectability, and periodically weak C-detectability. Moreover, we propose efficient approaches to verify such properties in the case of bounded labeled Petri net systems. The proposed approaches use the notion of basis marking and thus do not require an exhaustive enumeration of the reachability space
Impacts of fixed orthodontic appliance and clear-aligner on daily performance in adult patients with moderate need for treatment [Retraction]
No full textLin F, Yao L, Bhikoo C, Guo J. Impacts of fixed orthodontic appliance and clear-aligner on daily performance in adult patients with moderate need for treatment. Patient Preference and Adherence. 2016;10:1639–1645.The corresponding author Dr Jing Guo, was not aware that his/her name had been used and did not give permission for the paper to be published. In addition, there were serious errors in the statistical tests used. This retraction relates to this paper 
Spin pairing: the magnetic origin of high-T-c superconductivity
No full textThe experimental results accumulated in the past decade such as coexistence of AF ordering and superconducting coherence, spin gap and anomalous Hall effect indicate that spin coupling is of importance to the unconventional pairing mechanism. By taking a quasi-two-dimensional Ising lattice as the background, we propose a double exchange model, i.e. Kondo exchange J between electrons and local moments and AF superexchange K between local moments. In a proper doping range where the superexchange K is weakened by the doped holes. we show that Kondo scattering yields an effective spin coupling between two electrons nearby a local moment with suppressed AF exchange, The effective spin coupling leads to local triplet pairing (S = 1, S-z = 0) in the Ising lattice plane. The binding energy of the triplet pair increases with the increasing doped hole concentration until a maximum is reached. The K-J model explains the existing experimental results for high-T-c copper oxides. such as the phase diagram, d-wave pairing, short coherent length, spin gap, pseudogap and the asymmetry of the tunneling conductance. According to our analysis, high-T-c phenomena are essentially magnetic in nature. (C) 2001 Elsevier Science B.V. All rights reserved.Physics, AppliedSCI(E)EICPCI-S(ISTP)
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
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