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  • 1
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    Observation of X(2370) and search for X(2120) in $$J/psi ightarrow gamma K{ ar{K}} eta '$$ (2020)
    Springer
    Details
    Publication Date: 2020-08-01
    Description: Using a sample of $$1.31imes 10^{9} ~J/psi $$1.31×109J/ψ events collected with the BESIII detector, we perform a study of $$J/psi ightarrow gamma K{ ar{K}}eta '$$J/ψ→γKK¯η′. X(2370) is observed in the $$K{ ar{K}}eta '$$KK¯η′ invariant-mass distribution with a statistical significance of $$8.3sigma $$8.3σ. Its resonance parameters are measured to be $$M=2341.6pm 6.5 , ext {(stat.)} pm 5.7 , ext {(syst.)}~ hbox {MeV}/c^{2}$$M=2341.6±6.5(stat.)±5.7(syst.)MeV/c2 and $$Gamma = 117pm 10 , ext {(stat.)}pm 8 , ext {(syst.)}~hbox {MeV}$$Γ=117±10(stat.)±8(syst.)MeV. The product branching fractions for $$J/psi ightarrow gamma X(2370),X(2370) ightarrow K^{+}K^{-}eta '$$J/ψ→γX(2370),X(2370)→K+K-η′ and $$J/psi ightarrow gamma X(2370),X(2370) ightarrow K_{S}^{0}K_{S}^{0}eta '$$J/ψ→γX(2370),X(2370)→KS0KS0η′ are determined to be $$(1.79pm 0.23, ext {(stat.)}pm 0.65,ext {(syst.)})imes 10^{-5}$$(1.79±0.23(stat.)±0.65(syst.))×10-5 and $$(1.18pm 0.32, ext {(stat.)}pm 0.39, ext {(syst.)})imes 10^{-5}$$(1.18±0.32(stat.)±0.39(syst.))×10-5, respectively. No evident signal for X(2120) is observed in the $$K{ ar{K}}eta '$$KK¯η′ invariant-mass distribution. The upper limits for the product branching fractions of $${mathcal {B}}(J/psi ightarrow gamma X(2120) ightarrow gamma K^{+} K^{-} eta ')$$B(J/ψ→γX(2120)→γK+K-η′) and $${mathcal {B}}(J/psi ightarrow gamma X(2120) ightarrow gamma K_{S}^{0} K_{S}^{0} eta ')$$B(J/ψ→γX(2120)→γKS0KS0η′) are determined to be $$1.49imes 10^{-5}$$1.49×10-5 and $$6.38imes 10^{-6}$$6.38×10-6 at the 90% confidence level, respectively.
    Print ISSN: 1434-6044
    Electronic ISSN: 1434-6052
    Topics: Physics
    Published by Springer
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  • 2
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    Precise measurements of branching fractions for $$ {mathrm{D}}_{mathrm{s}}^{+} $$ meson decays to two pseudoscalar mesons (2020)
    Springer
    Details
    Publication Date: 2020-08-01
    Description: We measure the branching fractions for seven $$ {D}_s^{+} $$ D s + two-body decays to pseudo-scalar mesons, by analyzing data collected at $$ sqrt{s} $$ s = 4.178 ∼ 4.226 GeV with the BESIII detector at the BEPCII collider. The branching fractions are determined to be$$ {displaystyle egin{array}{c}mathcal{B}left({D}_s^{+}o {K}^{+}eta hbox{'} ight)=left(2.68pm 0.17pm 0.17pm 0.08 ight)imes {10}^{-3}, {}mathcal{B}left({D}_s^{+}o eta hbox{'}{pi}^{+} ight)=left(37.8pm 0.4pm 2.1pm 1.2 ight)imes {10}^{-3}, {}mathcal{B}left({D}_s^{+}o {K}^{+}eta ight)=left(1.62pm 0.10pm 0.03pm 0.05 ight)imes {10}^{-3}, {}mathcal{B}left({D}_s^{+}o eta {pi}^{+} ight)=left(17.41pm 0.18pm 0.27pm 0.54 ight)imes {10}^{-3}, {}mathcal{B}left({D}_s^{+}o {K}^{+}{K}_S^0 ight)=left(15.02pm 0.10pm 0.27pm 0.47 ight)imes {10}^{-3}, {}mathcal{B}left({D}_s^{+}o {K}_S^0{pi}^{+} ight)=left(1.109pm 0.034pm 0.023pm 0.035 ight)imes {10}^{-3}, {}mathcal{B}left({D}_s^{+}o {K}^{+}{pi}^0 ight)=left(0.748pm 0.049pm 0.018pm 0.035 ight)imes {10}^{-3},end{array}} $$ B D s + → K + η ' = 2.68 ± 0.17 ± 0.17 ± 0.08 × 10 − 3 , B D s + → η ' π + = 37.8 ± 0.4 ± 2.1 ± 1.2 × 10 − 3 , B D s + → K + η = 1.62 ± 0.10 ± 0.03 ± 0.05 × 10 − 3 , B D s + → η π + = 17.41 ± 0.18 ± 0.27 ± 0.54 × 10 − 3 , B D s + → K + K S 0 = 15.02 ± 0.10 ± 0.27 ± 0.47 × 10 − 3 , B D s + → K S 0 π + = 1.109 ± 0.034 ± 0.023 ± 0.035 × 10 − 3 , B D s + → K + π 0 = 0.748 ± 0.049 ± 0.018 ± 0.035 × 10 − 3 , where the first uncertainties are statistical, the second are systematic, and the third are from external input branching fraction of the normalization mode $$ {D}_s^{+} $$ D s + → K+K−π+. Precision of our measurements is significantly improved compared with that of the current world average values.
    Print ISSN: 1126-6708
    Electronic ISSN: 1029-8479
    Topics: Physics
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  • 3
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    Measurement of the D → K−π+π+π− and D → K−π+π0 coherence factors and average strong-phase differences in quantum-correlated $$ Doverline{D} $$ decays (2021)
    Springer
    Details
    Publication Date: 2021-05-01
    Description: The decays D → K−π+π+π− and D → K−π+π0 are studied in a sample of quantum-correlated $$ Doverline{D} $$ D D ¯ pairs produced through the process e+e− → ψ(3770) → $$ Doverline{D} $$ D D ¯ , exploiting a data set collected by the BESIII experiment that corresponds to an integrated luminosity of 2.93 fb−1. Here D indicates a quantum superposition of a D0 and a $$ {overline{D}}^0 $$ D ¯ 0 meson. By reconstructing one neutral charm meson in a signal decay, and the other in the same or a different final state, observables are measured that contain information on the coherence factors and average strong-phase differences of each of the signal modes. These parameters are critical inputs in the measurement of the angle γ of the Unitarity Triangle in B− → DK− decays at the LHCb and Belle II experiments. The coherence factors are determined to be RK3π = $$ {0.52}_{-0.10}^{+0.12} $$ 0.52 − 0.10 + 0.12 and $$ {R}_{K{pi pi}^0} $$ R K ππ 0 = 0.78 ± 0.04, with values for the average strong-phase differences that are $$ {delta}_D^{K3pi }=left({167}_{-19}^{+31} ight){}^{circ} $$ δ D K 3 π = 167 − 19 + 31 ° and $$ {delta}_D^{K{pi pi}^0}=left({196}_{-15}^{+14} ight){}^{circ} $$ δ D K ππ 0 = 196 − 15 + 14 ° , where the uncertainties include both statistical and systematic contributions. The analysis is re-performed in four bins of the phase-space of the D → K−π+π+π− to yield results that will allow for a more sensitive measurement of γ with this mode, to which the BESIII inputs will contribute an uncertainty of around 6°.
    Print ISSN: 1126-6708
    Electronic ISSN: 1029-8479
    Topics: Physics
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  • 4
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    Interaction of magnolia bark extracts with Staphylococcus aureus DNA and evaluation of the stability of their antibacterial activities (2021)
    Springer
    Details
    Publication Date: 2021-08-05
    Print ISSN: 0302-8933
    Electronic ISSN: 1432-072X
    Topics: Biology
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  • 5
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    Measurement of the absolute branching fraction of the inclusive decay $$Lambda _c^+ ightarrow K_S^0X$$ (2020)
    Springer
    Details
    Publication Date: 2020-10-01
    Description: We report the first measurement of the absolute branching fraction of the inclusive decay $$Lambda _c^+ ightarrow K_S^0X$$ Λ c + → K S 0 X . The analysis is performed using an $$e^+e^-$$ e + e - collision data sample corresponding to an integrated luminosity of 567 $$hbox {pb}^{-1}$$ pb - 1 taken at $$sqrt{s}$$ s = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored $${ ar{Lambda }}_c^-$$ Λ ¯ c - decay modes and the double-tag technique, this absolute branching fraction is measured to be $${mathcal {B}}(Lambda _c^+ ightarrow K_S^0X)=(9.9pm 0.6pm 0.4)\%$$ B ( Λ c + → K S 0 X ) = ( 9.9 ± 0.6 ± 0.4 ) % , where the first uncertainty is statistical and the second systematic. The relative deviation between the branching fractions for the inclusive decay and the observed exclusive decays is $$(18.7pm 8.3)\%$$ ( 18.7 ± 8.3 ) % , which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.
    Print ISSN: 1434-6044
    Electronic ISSN: 1434-6052
    Topics: Physics
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of secondary plant substances on the growth and development of Myzus persicae of Beijing (1984)
    Springer
    Entomologia experimentalis et applicata 35 (1984), S. 17-20 
    Details
    ISSN: 1570-7458
    Keywords: Aphididae ; Myzus persicae ; artificial diet ; preference tests ; secondary plant substances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des Myzus persicae de la région de Beijing, conservés sur tabac en serre, ont été élevés sur un régime artificiel voisin de celui de Dadd & Mittler (1966); sinigrine, tomatine, nicotine, gossypol, phlorizine, inuline et acide malique ont été ajoutés séparément aux concentrations de 0,1 et 0,2%. En comparant les préférences, aucun des régimes enrichis en substances secondaires n'était supérieur au régime de base. La prise alimentaire pendant le développement larvaire a été quantifiée en utilisant de la glycine C14 dans le régime. Les èlevages étaient conduits à 25±1 °C et H. R. 85% et une photopériode J/N: 16/8. Le prélèvement total de régime de base pendant le développement larvaire était environ 1,16 μl/puceron. L'addition de substances secondaires végétales au régime induit de façon inégale le prélèvement, dans l'ordre suivant: nicotine〉phlorizine〉gossypol〉tomatine〉acide malique〉inuline〉sinigrine. Les larves consommant sur des régimes contenant de la sinigrine ou de la tomatine à partir du second jour après la naissance semblent prèsenter une plus grande tolèrance pour la sinigrine que la tomatine, avec une mortalité de 9,6% en 7 jours d'élevage pour la première et 89,4% pour la seconde. Ainsi ces pucerons diffèrent de ceux de Hollande, puisque ces derniers tolèrent plus la tomatine (Schoonhoven & Derksen-Koppers, 1976). L'addition d'inuline, d'acide malique ou de sinigrine ne provoque pas de différence significative dans le taux de développement larvaire ou la longévité des adultes. Des régimes contenant ces substances pourraient permettre le développement et la reproduction de pucerons pendant au moins 3 générations.
    Notes: Abstract Green peach aphids Myzus persicae from the Beijing region, maintained on greenhouse tobacco plants, were reared on modified artificial diet; sinigrin, tomatine, nicotine, gossypol, phlorizin, inulin and malic acid were added separately in concentrations of 0.1% or 0.2%. In preference tests none of the diets enriched by secondary substances was more acceptable than the basal diet. Diet uptake during larval development was determined quantitatively by using C14 glycine in the diets. For the basal diet the total uptake during larval development was about 1.16 μl/aphid. The addition of secondary plant substances to the diet caused reductions of uptake to different degrees in the order: nicotine〉phlorizin〉gossypol〉tomatine〉malic acid〉inulin〉sinigrin. The larvae feeding on diets containing sinigrin or tomatine from the second day after birth seemed to have a much higher tolerance for sinigrin than tomatine, with a mortality of 9.6% within 7 days of rearing for the former and 89.4% for the latter. Hence this aphid differs from that occurring in the Netherlands in that the latter has a higher tolerance towards tomatine. The addition of inulin, malic acid or sinigrin did not cause a significant difference in the rate of larval development or in adult longevity. Diets containing these substances could support the aphid's development and reproduction for at least three generations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343451
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  • 7
    Electronic Resource
    Electronic Resource
    Observation of space charges in the photorefractive region and surface electric breakdown in LiNbO3-Fe (1982)
    Springer
    Applied physics 29 (1982), S. 195-198 
    Details
    ISSN: 1432-0630
    Keywords: 78.20F ; 77.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The space chages formed in the process of photorefraction in LiNbO3 crystals is visualised by charged powder techniques. The results confirmed the existence of space charge carriers at the periphery of the illuminated region with negative charge carriers in the +z periphery and positive in the −z. The observed patterns on the surface of LiNbO3-Fe (0.05%) crystal illuminated with higher light intensities presented discharge-like features, namely traces of discharge in the medium at the crystal surface. The correlation between the kinetics curves of birefringence changeΔn(t) and the revealed surface patterns indicated that electric breakdown of the medium at the surfaces was responsible for the periodic reduction ofΔn(t).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615066
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic response of viscoelastic beam (1981)
    Springer
    Applied mathematics and mechanics 2 (1981), S. 255-264 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Dynamic analysis of the viscoelastic simple supported beam has been made in accordance with the relationship between stress and strain expressed by the simplest Voigt mechanical model, from which several analytic expressions have been obtained. It is shown that the reduction of the ratio of natural frequencies progresses with the increase of the exciting frequency for high modes (Tab.1). In the final part of this paper, the forced vibration of simple supported beam subjected to a random and harmonic excitation has also been dealt with, and the representations of the beam deflection have been derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01876783
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  • 9
    Electronic Resource
    Electronic Resource
    The aquatic drift patterns of black flies (Diptera: Simuliidae) (1983)
    Springer
    Hydrobiologia 107 (1983), S. 183-191 
    Details
    ISSN: 1573-5117
    Keywords: aquatic drift ; black flies ; sibling species ; periodicity ; running water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Larval (5th-final instar) drift patterns of five species of black flies (Prosimulium mixtum, Stegopterna mutata, Simulium tuberosum FG, S. vittatum IIIL-1, and S. vittatum IS-7) were analyzed. The diel drift patterns were not species-specific, but consistently exhibited a marked increase after sunset, preceded by a period of minimal drift. The drift minimum generally occurred during or shortly after the period of maximum water temperature. Larvae showed significantly more nocturnal than diurnal drift. Pupal drift was attributed to accidental detachment from the substrate. Adult drift was over 90% diurnal and usually composed primarily of teneral individuals. Upstream larval movements of the S. vittatum and S. tuberosum complexes were each less than 6.5% of the total upstream and downstream larval movements. The proportion of parasitized larvae of the S. vittatum and S. tuberosum complexes was generally higher in the benthos than in the drift. Based in part on data included in a thesis submitted by the senior author to The Pennsylvania State University in partial fulfillment of the requirements for the Ph. D. degree.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017433
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  • 10
    Electronic Resource
    Electronic Resource
    Circular welding problems with a crack (1983)
    Springer
    Applied mathematics and mechanics 4 (1983), S. 751-763 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In this paper, the problem of an infinite plane with a circular hole welded by a nearly circular plate with a crack of different material is considered. The problem is transformed into solving a certain boundary value problem of analytic functions and then reduced to solving a singular integral equation along the crack. The formulas and some numerical results of the factors of stress intensity for the cases Mode I and Mode II are obtained at the end of this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02432086
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