18,149 research outputs found
The Neutrophil/Lymphocyte Ratio Could Predict Noninvasive Mechanical Ventilation Failure in Patients with Acute Exacerbation of Chronic Obstructive Pulmonary Disease: A Retrospective Observational Study [Corrigendum]
No full textSun W, Luo Z, Jin J, Cao Z, Ma Y. Int J Chron Obstruct Pulmon Dis. 2021;16:2267–2277.
The authors have advised the author list on page 2267 is incorrect. The text “Yingmin Ma2” should read “Yingmin Ma1,2”.
The authors apologize for this error
Simulation results of 3D ETS (Episodic Tremor and Slow-slip) asperity-in-matrix model using QDYN earthquake simulator
No full textThis data set contains simulation results of 3D ETS asperity-in-matrix model of Matlab .mat files for
Luo, Y., and Liu, Z. (2021) Fault Zone Heterogeneities Explain Depth-dependent Pattern and Evolution of Slow Earthquakes in Cascadia, Nature Communications.
It is generated by QDYN earthquake simulator (https://github.com/ydluo/qdyn Luo, Y., Ampuero, J. P., Galvez, P., Van den Ende, M., and Idini, B. (2017). QDYN: a Quasi-DYNamic earthquake simulator (v1. 1). Zenodo.(doi: 10.5281/zenodo. 322459).)
1. Uniform Model (10 years, dense output, Uniform_model/)
2. Binary (Bi-modular) Model (4 years, Binary_model/)
3. Linear Model (40 years, dense output, Linear_model/)
4. Comparison of asperity distributions (asp_patttern/):
4.1 (asp_patttern/tri/) - hexagon pattern asperity distribution
4.2 (asp_patttern/sqr/) - rectangular pattern asperity distribution
4.2 (asp_patttern/rnd/) - random asperity distribution
File format: (see details in documents of QDYN)
p - model settings
ot0, ot3d: timeseries outputs
ox0, ox3d: snapshot outputs<br
Complete solution of the Diophantine equation
No full textsummary:The triples , , where , satisfy the equation . In this paper it is shown that the same equation has no integer solution with , thus a conjecture put forward by Z. Zhang, J. Luo, P. Z. Yuan (2013) is confirmed
A New Exact Algorithm for Single-Commodity Vehicle Routing with Split Pickups and Deliveries
No full textWe present a new exact algorithm to solve a challenging vehicle routing problem with split pickups and deliv-
eries, named as the Single Commodity Split Pickup and Split Delivery Vehicle Routing Problem (SPDVRP).
In the SPDVRP, any amount of a product collected from a pickup customer can be supplied to any delivery
customers, and the demand of each customer can be collected or delivered multiple times by the same or
dierent vehicles. The vehicle
eet is homogeneous with limited capacity and maximum route duration. This
problem arises regularly in inventory and routing rebalancing applications, such as in bike-sharing systems,
where bikes must be rebalanced over time such that the appropriate number of bikes and open docks are
available to users. The solution of the SPDVRP requires determining the number of visits to each customer,
the relevant portions of the demands to be collected from or delivered to the customers, and the routing of
the vehicles. These three decisions are intertwined, contributing to the hardness of the problem.
Our new exact algorithm for the SPDVRP is a branch-price-and-cut algorithm based on a pattern-based
mathematical formulation. The algorithm relies on a novel label-setting algorithm used to solve the pricing
problem associated with the pattern-based formulation, where the label components embed reduced cost
functions, unlike those classical components that embed delivered or collected quantities, thus signicantly
reducing the dimension of the corresponding state space. Extensive computational results on dierent classes
of benchmark instances illustrate that the newly proposed exact algorithm solves several open SPDVRP
instances and signicantly improves the running times of state-of-the-art algorithms
High-Order State Transition Polynomial with Time Expansion Based on Differential Algebra
No full textIn this study, the problem of propagating an initial orbital state around its reference value to a variable final time is addressed. Based on the differential algebra (DA) technique, a high-order state transition polynomial with time expansion (STP-T) method is developed. The STP-T is a high-order Taylor approximation of the final orbital state expanded around the reference initial state and the propagation time. Thus, given the initial displaced orbital state, any state around the reference final time can be efficiently obtained by evaluating the corresponding polynomial. Furthermore, an asynchronous-order scheme for STP-T is presented, which enables the STP-T to have different orders with respect to the variables with different nonlinearity. Besides, the manual derivation and integration of the high-order variational equations is avoided in the DA framework, which makes the order of the polynomial flexible and the method versatile for various dynamics. The simulation results indicate that the STP-T supplies a good approximation of the final state in pure and J2 perturbed Keplerian dynamics, and in a nonlinear relative motion
sj-docx-1-jdr-10.1177_00220345231187824 – Supplemental material for Butyrate Inhibits Dendritic Cell Activation and Alleviates Periodontitis
No full textSupplemental material, sj-docx-1-jdr-10.1177_00220345231187824 for Butyrate Inhibits Dendritic Cell Activation and Alleviates Periodontitis by L. Wu, Z. Luo, Y. Chen, Z. Yan, J. Fu, Y. Jiang, J. Xu and Y. Liu in Journal of Dental Research</p
Structure characterization and tribological study of magnetron sputtered nanocomposite nc-TiAlV(N, C)/a-C coatings
No full textGrown by reactive unbalanced magnetron sputtering in a mixed N2 and CH4 gaseous medium, heterogeneous nanocomposite coatings in the Ti-Al-V-N-C system show extraordinarily excellent tribological performance of coated machining tools. Using analytical high resolution TEM, EELS, FEG-SEM, XRD, and Raman spectroscopy, this paper reports detailed structural and chemical characterization of the coatings grown at various CH4: N2 ratios. Meanwhile, the mechanical and tribological properties were also measured, including hardness, Young’s modulus, residual stress and the dry-sliding friction and wear at varying environmental humidity. When CH4 gas was introduced in the deposition, the structure of the coatings has been found to experience a change from nano-scale TiAlN-VN multilayer architecture to a complex mixture of columnar grains of nc-TiAlV(N,C)/a-C nanocomposites and inter-column network of sp2-type amorphous carbon. Carbon incorporation and segregation also shows remarkable influence on the columnar growth model by leading to finer grain size. As compared to the carbon-free nitride coating, the nanocomposite coatings showed substantially reduced residual stress owing to the free-carbon precipitation, whereas the coatings maintained comparable hardness to the carbon-free TiAlN/VN. Their tribological properties were found to be strongly dependent on the environment. In humid air at RH > 30%, the coatings showed low friction coefficient less than 0.4 and extremely low wear rate at a scale of ~10-17 m3N-1m-1
An external heat pulse method for measurement of sap flow through fruit pedicels, leaf petioles and other small-diameter stems
No full textThe external heat ratio method is described for measurement of low rates of sap flow in both directions through stems and other plant organs, including fruit pedicels, with diameters up to 5 mm and flows less than 2 g h⁻¹. Calibration was empirical, with heat pulse velocity (vh) compared to gravimetric measurements of sap flow. In the four stem types tested (Actinidia sp. fruit pedicels, Schefflera arboricola petioles, Pittosporum crassifolium stems and Fagus sylvatica stems), vh was linearly correlated with sap velocity (vs) up to a vs of approximately 0.007 cm s⁻¹, equivalent to a flow of 1.8 g h⁻¹ through a 3-mm-diameter stem. Minimum detectable vs was approximately 0.0001 cm s⁻¹, equivalent to 0.025 g h⁻¹ through a 3-mm-diameter stem. Sensitivity increased with bark removal. Girdling had no effect on short-term measurements of in vivo sap flow, suggesting that phloem flows were too low to be separated from xylem flows. Fluctuating ambient temperatures increased variability in outdoor sap flow measurements. However, a consistent diurnal time-course of fruit pedicel sap flow was obtained, with flows towards 75-day-old kiwifruit lagging behind evaporative demand and peaking at 0.3 g h⁻¹ in the late afternoon
Saltwater intrusion in the Po River Delta (Italy) during drought conditions: Analyzing its Spatio-temporal evolution and potential impact on agriculture
No full textSaltwater intrusion along rivers is a complex process controlled by multiple factors and thus fluctuates with a highly nonlinear nature and time-varying characteristics. It is challenging to monitor saltwater intrusion. The objective of this study was to clarify the spatial-temporal variation of saltwater intrusion and its potential impact on agriculture in the Po River Delta (Italy). 2006 was the most severe year of saltwater intrusion in the period we considered. 2022 was even worse, but the data are still under processing. In this study, the Hilbert-Huang transform (HHT) and rescaled range (R/S) were used to identify the multi-time scales and change trends of the salinity and discharge in 2006. After that, the time-dependent intrinsic correlation (TDIC) was used to depict intrinsic relationships between salinity and discharge at different time scales. The results showed that discharge and salinity exhibited behaviours of positive long-range correlation during different periods. The temporal series of salinity and discharge was decomposed into six intrinsic mode functions (IMF) and residuals based on the ensemble empirical mode decomposition (EEMD). The sum of variance contribution rates of IMF1 (4 days), IMF2 (10 days), and IMF3 (12.1 days) of salinity was more than 75%. All measured TDICs have highlighted strong correlations between salinity and discharge. Furthermore, we used spatial interpolation techniques to map salinity data along rivers. This allowed the investigation of dynamic changes in saltwater intrusion patterns during periods of severe drought. Outcomes show a significant negative correlation between salinity and normalized difference vegetation index (NDVI), indicating that the study area's agricultural greening was affected by saltwater intrusion
Impact of tillage-induced microtopography on hydrological-sediment connectivity and its hydrodynamic understanding
No full textTillage-induced microtopography may affect hydrological and erosion processes. Nevertheless, how the tillage practices affect hydrological-sediment connectivity at the plot scale remains unclear, and there is little hydrodynamic understanding of soil erosion control by tillage practices. Rainfall simulations under three rainfall intensities (1.0, 1.5 and 2.0 mm min−1) and slope gradients (10, 15 and 20°) were implemented in three 4.0 by 0.8 m soil boxes with different microtopographic patterns (smooth (CK slope), medium rough (AD slope), and rough surface (RT slope)). This study coupled the relative surface connectivity function (RSCf) and the index of connectivity (IC) to assess the impacts of microtopography on hydrological-sediment connectivity. The results showed that soil microtopography delayed the runoff generation and hindered the development of hydrological processes on a gentle slope with low rainfall intensity (10°, 1.0 mm min−1). The impact of microtopography on hydrological connectivity gradually reduced when rainfall intensity and slope increased. The sediment connectivity was higher on the AD slope, followed by the RT slope, and then on the CK slope. The formation of rills significantly enhanced sediment connectivity on the tilled slopes. The critical hydrodynamic parameters required for soil erosion initiation increased with the increase in microrelief. For the CK slope, critical flow shear stress, critical stream power, and critical unit stream power were 1.214 Pa, 0.151 N m−1 s−1, and 0.002 m s−1, respectively. For the AD slope, the corresponding critical hydrodynamic values were 2.505 Pa, 0.205 N m−1 s−1, and 0.003 m s−1, respectively. For the RT slope, the corresponding values were 3.323 Pa, 0.267 N m−1 s−1, and 0.005 m s−1, respectively. The results can provide a valuable reference for analyzing soil erosion mechanisms in sloping farmland
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