1,702 research outputs found
Dyson--Schwinger Approach to Hamiltonian QCD
Dyson--Schwinger equations are an established, powerful non-perturbative tool
for QCD. In the Hamiltonian formulation of a quantum field theory they can be
used to perform variational calculations with non-Gaussian wave functionals. By
means of the DSEs the various -point functions, needed in expectation values
of observables like the Hamilton operator, can be thus expressed in terms of
the variational kernels of our trial ansatz. Equations of motion for these
variational kernels are derived by minimizing the energy density and solved
numerically.Comment: Talk given by D. Campagnari at XIIth Quark Confinement and the Hadron
Spectrum, August 28-September 04, 2016, Thessaloniki, Greece, submitted to
the proceeding
Oscillator strengths and line widths of dipole-allowed transitions in ÂčâŽNâ between 86.0 and 89.7 nm
Oscillator strengths of 23 electric-dipole-allowed bands of ÂčâŽNâ in the 86.0â89.7 nm (111â480â116â280âcmâ»Âč) region are reported from synchrotron-based photoabsorptionmeasurements at an instrumental resolution of 6.5Ă10â»âŽânmâ(0.7âcmâ»Âč) full width at half maximum.Partial support for this research was provided by the
Australian Research Council Discovery Program through
Grant No. DP0558962 and by NASA Grant No.
NNX08AE786 to Wellesley College
Multiple carbon incorporation strategies support microbial survival in cold subseafloor crustal fluids
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Trembath-Reichert, E., Shah Walter, S. R., Ortiz, M. A. F., Carter, P. D., Girguis, P. R., & Huber, J. A. Multiple carbon incorporation strategies support microbial survival in cold subseafloor crustal fluids. Science Advances, 7(18), (2021): eabg0153, https://doi.org/10.1126/sciadv.abg0153.Biogeochemical processes occurring in fluids that permeate oceanic crust make measurable contributions to the marine carbon cycle, but quantitative assessments of microbial impacts on this vast, subsurface carbon pool are lacking. We provide bulk and single-cell estimates of microbial biomass production from carbon and nitrogen substrates in cool, oxic basement fluids from the western flank of the Mid-Atlantic Ridge. The wide range in carbon and nitrogen incorporation rates indicates a microbial community well poised for dynamic conditions, potentially anabolizing carbon and nitrogen at rates ranging from those observed in subsurface sediments to those found in on-axis hydrothermal vent environments. Bicarbonate incorporation rates were highest where fluids are most isolated from recharging bottom seawater, suggesting that anabolism of inorganic carbon may be a potential strategy for supplementing the ancient and recalcitrant dissolved organic carbon that is prevalent in the globally distributed subseafloor crustal environment.The Gordon and Betty Moore Foundation sponsored most of the observatory components at North Pond through grant GBMF1609. This work was supported by the National Science Foundation through grants NSF OCE-1745589, OCE-1635208, and OCE-1062006 to J.A.H. and NSF OCE-1635365 to P.R.G. and S.R.S.W.; NASA Postdoctoral Fellowship with the NASA Astrobiology Institute to E.T.-R.; LâOrĂ©al USA For Women in Science Fellowship to E.T.-R.; and Woods Hole Partnership Education Program, sponsored by the Woods Hole Diversity Initiative to M.A.F.O. The Center for Dark Energy Biosphere Investigations (C-DEBI OCE-0939564) also supported the participation of J.A.H. and P.D.C. This is C-DEBI contribution number 564
SS29. Endovascular Chimney (Snorkel) Technique vs Open Surgery for Repair of Juxtarenal and Suprarenal Aneurysms
Regional gray matter volume and structural network strength in somatic vs. non-somatic delusional disorders.
How much do we really lose?âYield losses in the proximity of natural landscape elements in agricultural landscapes
Natural landscape elements (NLEs) in agricultural landscapes contribute to biodiversity and ecosystem services, but are also regarded as an obstacle for largeâscale agricultural production. However, the effects of NLEs on crop yield have rarely been measured. Here, we investigated how different bordering structures, such as agricultural roads, fieldâtoâfield borders, forests, hedgerows, and kettle holes, influence agricultural yields. We hypothesized that (a) yield values at field borders differ from midâfield yields and that (b) the extent of this change in yields depends on the bordering structure.
We measured winter wheat yields along transects with logâscaled distances from the border into the agricultural field within two intensively managed agricultural landscapes in Germany (2014 near Göttingen, and 2015â2017 in the Uckermark).
We observed a yield loss adjacent to every investigated bordering structure of 11%â38% in comparison with midâfield yields. However, depending on the bordering structure, this yield loss disappeared at different distances. While the proximity of kettle holes did not affect yields more than neighboring agricultural fields, woody landscape elements had strong effects on winter wheat yields. Notably, 95% of midâfield yields could already be reached at a distance of 11.3 m from a kettle hole and at a distance of 17.8 m from hedgerows as well as forest borders.
Our findings suggest that yield losses are especially relevant directly adjacent to woody landscape elements, but not adjacent to inâfield water bodies. This highlights the potential to simultaneously counteract yield losses close to the field border and enhance biodiversity by combining different NLEs in agricultural landscapes such as creating strips of extensive grassland vegetation between woody landscape elements and agricultural fields. In conclusion, our results can be used to quantify ecocompensations to find optimal solutions for the delivery of productive and regulative ecosystem services in heterogeneous agricultural landscapes
Analysis of the Temporal Organization of Sleep Spindles in the Human Sleep EEG Using a Phenomenological Modeling Approach
The sleep electroencephalogram (EEG) is characterized by typical oscillatory patterns such as sleep spindles and slow waves. Recently, we proposed a method to detect and analyze these patterns using linear autoregressive models for short (ââ1Â s) data segments. We analyzed the temporal organization of sleep spindles and discuss to what extent the observed interevent intervals correspond to properties of stationary stochastic processes and whether additional slow processes, such as slow oscillations, have to be assumed. We have found evidence for such an additional slow process, most pronounced in sleep stage 2
Quantum gate in the decoherence-free subspace of trapped ion qubits
We propose a geometric phase gate in a decoherence-free subspace with trapped
ions. The quantum information is encoded in the Zeeman sublevels of the
ground-state and two physical qubits to make up one logical qubit with ultra
long coherence time. Single- and two-qubit operations together with the
transport and splitting of linear ion crystals allow for a robust and
decoherence-free scalable quantum processor. For the ease of the phase gate
realization we employ one Raman laser field on four ions simultaneously, i.e.
no tight focus for addressing. The decoherence-free subspace is left neither
during gate operations nor during the transport of quantum information.Comment: 6 pages, 6 figure
Effects of Fish Oil Supplementation on Post-Resistance Exercise Muscle Soreness in Untrained Females
The anti-inflammatory properties of omega-3 fatty acids contained in fish oil may help alleviate symptoms of delayed onset of muscle soreness (DOMS) and improve recovery from exercise.
PURPOSE: To examine the effects of fish oil supplementation on the time-course of post-resistance exercise muscle soreness in young untrained females.
METHODS: Seventeen non-resistance trained females (age 23.6 ± 3.0 y, % fat 27.4 ± 3.2, weight 60.2 ± 9.6 kg) were randomized into one of two groups: fish oil (6 g/d; 5:1 EPA:DHA) or placebo (6 g/d corn/soy oil). After consuming the supplements for one week, participants underwent a single bout of resistance exercise designed to induce muscle damage. Subjects performed 10 sets to failure of biceps curl machine and leg extensions using 50% of the previously measured 1-repetition maximum. Over the next week, subjective muscle soreness of the upper and lower body was measured via a grounded 10-cm visual analog scale. At 48 hours and 1 week post-exercise, subjects performed a test to determine soreness during functional movements. The comparison-wise error rate was set at p \u3c 0.10.
RESULTS: Muscle soreness increased significantly in both groups and peaked at 48 hours post-exercise. The fish oil group perceived less muscle soreness in the lower body than the placebo group (p= 0.06), but there was no difference in the upper body (p= 0.27). The fish oil group reported less perceived soreness during functional movements (p= 0.07 for upper and lower body soreness). Effect sizes, indicating the reduction in muscle soreness that may be attributed to fish oil (Î effect size between groups), was 0.75 (95% CI: -0.70 â 2.20) for the arms and 0.77 (-0.76 â 2.33) for the legs. The effect size for the functional tests was 0.63 (-0.71 â 1.97) for the arms and 0.57 (-0.85 â 1.99) for the legs.
CONCLUSION: Supplementing the diet with 6 grams per day of fish oil may alleviate the muscle soreness experienced after resistance training in young untrained females, but additional studies with larger sample sizes should be conducted to confirm these findings
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