321 research outputs found
Isomer shift and magnetic moment of the long-lived 1/2 isomer in Zn: signature of shape coexistence near Ni
Collinear laser spectroscopy has been performed on the Zn
isotope at ISOLDE-CERN. The existence of a long-lived isomer with a few hundred
milliseconds half-life was confirmed, and the nuclear spins and moments of the
ground and isomeric states in Zn as well as the isomer shift were
measured. From the observed hyperfine structures, spins and
are firmly assigned to the ground and isomeric states. The magnetic moment
(Zn) = 1.1866(10) , confirms the spin-parity
with a shell-model configuration, in excellent
agreement with the prediction from large scale shell-model theories. The
magnetic moment (Zn) = 1.0180(12) supports a
positive parity for the isomer, with a wave function dominated by a 2h-1p
neutron excitation across the shell gap. The large isomer shift
reveals an increase of the intruder isomer mean square charge radius with
respect to that of the ground state:
= +0.204(6) fm, providing first evidence of shape coexistence.Comment: 5 pages, 4 figures, 1 table, Accepeted by Phys. Rev. Lett. (2016
Little impact of Three Gorges Dam on recent decadal lake decline across China's Yangtze Plain
The ubiquitous lakes across China's Yangtze Plain (YP) are indispensable freshwater resources sustaining ecosystems and socioeconomics for nearly half a billion people. Our recent survey revealed a widespread net decline in the total YP lake inundation area during 2000–2011 (a cumulative decrease of ∼10%), yet its mechanism remains contentious. Here, we uncover the impacts of climate variability and anthropogenic activities including i) Yangtze flow and sediment alterations by the Three Gorges Dam (TGD) and ii) human water consumption in agricultural, industrial, and domestic sectors throughout the downstream Yangtze Basin. Results suggest that climate variability is the dominant driver of this decadal lake decline, whereas studied human activities, despite varying seasonal impacts that peak in fall, contribute marginal fraction (∼10–20% or less) to the interannual lake area decrease. Given that the TGD impacts on the total YP lake area and its seasonal variation are both under ∼5%, we also dismiss the speculation that the TGD might be responsible for evident downstream climate change by altering lake surface extent and thus open water evaporation. Nevertheless, anthropogenic impacts exhibited a strengthening trend during the past decade. Although the TGD has reached its full-capacity water regulation, the negative impacts of human water consumption and TGD-related net channel erosion are already comparable to that of TGD's flow regulation, and may continue to grow as crucial anthropogenic factors to future YP lake conservation
Little impact of Three Gorges Dam on recent decadal lake decline across China's Yangtze Plain
The ubiquitous lakes across China's Yangtze Plain (YP) are indispensable freshwater resources sustaining ecosystems and socioeconomics for nearly half a billion people. Our recent survey revealed a widespread net decline in the total YP lake inundation area during 2000–2011 (a cumulative decrease of ∼10%), yet its mechanism remains contentious. Here, we uncover the impacts of climate variability and anthropogenic activities including i) Yangtze flow and sediment alterations by the Three Gorges Dam (TGD) and ii) human water consumption in agricultural, industrial, and domestic sectors throughout the downstream Yangtze Basin. Results suggest that climate variability is the dominant driver of this decadal lake decline, whereas studied human activities, despite varying seasonal impacts that peak in fall, contribute marginal fraction (∼10–20% or less) to the interannual lake area decrease. Given that the TGD impacts on the total YP lake area and its seasonal variation are both under ∼5%, we also dismiss the speculation that the TGD might be responsible for evident downstream climate change by altering lake surface extent and thus open water evaporation. Nevertheless, anthropogenic impacts exhibited a strengthening trend during the past decade. Although the TGD has reached its full-capacity water regulation, the negative impacts of human water consumption and TGD-related net channel erosion are already comparable to that of TGD's flow regulation, and may continue to grow as crucial anthropogenic factors to future YP lake conservation
A first approach to a neuropsychological screening tool using eye-tracking for bedside cognitive testing based on the Edinburgh Cognitive and Behavioural ALS Screen
Improved accuracy of in-ring laser spectroscopy by in-situ electron cooler voltage measurement
Existence of the magnetization plateau in a class of exactly solvable Ising-Heisenberg chains
The mapping transformation technique is applied to obtain exact results for
the spin-1/2 and spin-S (S=1/2,1) Ising-Heisenberg antiferromagnetic chain in
the presence of an external magnetic field. Within this scheme, a field-induced
first-order metamagnetic transition resulting in multiplateau magnetization
curves, is investigated in detail. It is found that the scenario of the plateau
formation depends fundamentally on the ratio between Ising and Heisenbrg
interaction constants, as well as on the anisotropy strength of the XXZ
Heisenberg interaction.Comment: 16 pages, 10 figures, submitted to J. Phys: Condens. Matte
Goal motives and multiple-goal striving in sport and academia: a person-centered investigation of goal motives and inter-goal relations
Objectives: This investigation extended the goal striving literature by examining motives for two goals being pursued simultaneously. Specifically, it examined how student athletes’ autonomous and controlled motives for their sporting and academic goals were associated with inter-goal facilitation and interference.
Design: Cross-sectional survey.
Methods: Student athletes (n = 204) from universities in the United Kingdom identified their most important sporting and academic goals. They then rated their autonomous and controlled motives for these goals and completed questionnaires assessing inter-goal facilitation and interference.
Results: Using a person-centered approach via latent class analysis, we identified three distinct classes of goal motives. Group difference analyses showed that the classes with higher autonomous motives reported greater facilitation from their academic goal to their sporting goal.
Conclusions: Extending the previous literature, the findings demonstrate the benefits of autonomous motives when simultaneously pursing goals in sport and academia
Meiofauna life on loggerhead sea turtles-diversely structured abundance and biodiversity hotspots that challenge the meiofauna paradox
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