Using a total of 9.0 fb−1 of e+e− collision data with center-of-mass energies between 4.15 and 4.30 GeV collected by the BESIII detector, we search for the processes e+e−→γX(3872) with X(3872)→π0χcJ ...for J=0, 1, 2. We report the first observation of X(3872)→π0χc1, a new decay mode of the X(3872), with a statistical significance of more than 5σ for all systematic fit variations. Normalizing to the previously established process e+e−→γX(3872) with X(3872)→π+π−J/ψ, we find B(X(3872)→π0χc1)/B(X(3872)→π+π−J/ψ)=0.88−0.27+0.33±0.10, where the first error is statistical and the second is systematic. We set 90% confidence level upper limits on the corresponding ratios for the decays to π0χc0 and π0χc2 of 19 and 1.1, respectively.
A protective ceramic coating was synthesized on CrMn alloy substrate by the slurry–spraying method. The thermal shock resistance and anti-oxidation properties of the coating were studied within a ...wide range of temperature in air atmosphere. The specimens were characterized by X-ray diffraction (XRD), metallurgical microscopy and scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX). The results showed that 53 times of thermo cycling test by air cooling and nine times by water quenching can be acquired before the coating failed. In the oxidation tests, compared with the bare sample, the as-synthesized coating reduced the weight gain of the CrMn alloy from 27.99mg/cm2 to 7.16mg/cm2 at 900°C isothermal oxidation (540min). At temperatures higher than 900°C, the ceramic coating diminished the oxidation loss significantly. The compact ceramic layer, mainly formed of BaCrO4, Cr2O3, and SiO2, decreased the element diffusion velocity including O and Fe. The thermal shock resistance was greatly enhanced by the hook-like ceramic which inlayed at the interface of the steel substrate and by the good match of the coefficient of thermal expansion (CTE) between the coating and substrate. The proposed protective mechanism of the anti-oxidation and thermal shock resistance properties of the coating is also discussed in this paper.
At the transition between mudflat and salt marsh, vegetation is traditionally regarded as a sustaining factor for previously incised mudflat channels, able to conserve the channel network via bank ...stabilization following plant colonization (i.e., vegetation‐stabilized channel inheritance). This is in contrast to recent studies revealing vegetation as the main driver of tidal channel emergence through vegetation‐induced channel erosion. We present a coupled hydrodynamic morphodynamic plant growth model to simulate plant expansion and channel formation by our model species (Spartina alterniflora) during a mudflat‐salt marsh transition with various initial bathymetries (flat, shoal dense, shoal sparse, and deep dense channels). This simulated landscape development is then compared to remote sensing images of the Yangtze estuary, China, and the Scheldt estuary in Netherlands. Our results propose the existence of a threshold in preexisting mudflat channel depth, which favors either vegetation‐stabilized channel inheritance or vegetation‐induced channel erosion processes. The increase in depth of preexisting mudflat channels favors flow routing through them, consequently leaving less flow and momentum remaining for vegetation‐induced channel erosion processes. This threshold channel depth will be influenced by field specific parameters such as hydrodynamics (tidal range and flow), sediment characteristics, and plant species. Hence, our study shows that the balance between vegetation‐stabilized channel inheritance and vegetation‐induced channel erosion depends on ecosystem properties.
Key Points
Plant, flow and sediment interaction in response to various initial bathymetryPlant‐flow interactions drive landscape development at initial flat bathymetryInitial bathymetry is able to influence the magnitude of plant‐flow interactions
In this paper, the spin and parity of the Zc(3900)± state are determined to be JP = 1+ with a statistical significance larger than 7σ over other quantum numbers in a partial wave analysis of the ...process e+e- → π+π-J/Ψ. We use a data sample of 1.92 fb-1 accumulated at $ \sqrt{s}=4.23 $ and 4.26 GeV with the BESIII experiment. When parametrizing the Zc(3900)± with a Flatté-like formula, we determine its pole mass Mpole = (3881.2±4.2stat ±52.7syst) MeV/c2 and pole width Γpole = (51.8± 4.6stat ± 36.0syst) MeV. Finally, we also measure cross sections for the process e+e- → Zc(3900)+π- + c.c. → J/Ψπ+π- and determine an upper limit at the 90% confidence level for the process e+e- → Zc(4020)+π- + c.c. → J/Ψ π+π-.
To study the safety and efficacy of simultaneous completion of colorectal cancer resection and liver metastasis resection by total laparoscopy.
In the observation group, 40 patients with colorectal ...cancer combined with liver metastasis (CRCLM) were selected to receive total laparoscopic surgery. At the same time, 40 cases were selected for laparoscopic resection of colorectal cancer and hepatic resection as control group.
The outcomes of the two methods in the treatment of CRCLM were compared. The results showed that the difference in surgery time between the two groups was not statistically significant (p>0.05). The blood loss, drainage tube retention time and anal exhaust recovery time in the observation group were significantly less than those in control group (p<0.05). No significant difference in completion rate was found between the two groups (p>0.05); the prevalence rate of complications in the observation group was significantly lower than that in control group (p<0.05). No significant differences in the median survival period and the survival rate at 1 year, 2 years and 3 years after surgery were found between the two groups (p>0.05).
The outcomes of total laparoscopy in the treatment of CRCLM are not inferior to open surgery.
The differences in arsenic (As) tolerance, uptake and accumulation between
Pteris vittata (an As hyperaccumulator) and
P. semipinnata (nonaccumulator) were investigated under hydroponic conditions. ...The results showed that As uptake by
P. vittata was significantly higher (
p
<
0.05) than that of
P. semipinnata. Significantly higher concentrations of As accumulated in the fronds of
P. vittata, while in the roots of
P. semipinnata. The short-term (<24
h) uptake kinetics were fitted a hyperbolic equation which could be divided into linear and saturable components (described by Michaelis–Menten kinetics/model). The increase in hydrogen peroxide (H
2O
2) content in both plant species significantly correlated (
p
<
0.05) with increasing As content in the plants and As exposure time, especially for midrib of
P. semipinnata.
P. semipinnata showed higher concentrations of H
2O
2 than those of
P. vittata. The relative electrical conductivity (REC, %) values in the root and pinnae followed a similar trend as plant H
2O
2 contents, increasing with As exposure, especially for
P. semipinnata. Significantly higher REC (%) values (
p
<
0.05) were observed in the root than that in pinnae of
P. semipinnata. The results indicated that high doses of As produced oxidative damages in both plant species.
To improve efficiency and head of the reactor coolant pump (RCP), an optimization approach is proposed based on Kriging model and genetic algorithm. 16 design cases containing three main parameters ...of blade, which are inlet angle β1, wrap angle ϕ, outlet blade angle β2, are designed by using the design of experiment(DOE) with Lation Hypercube. The efficiency and head are calculated by steady numerical simulation. The max efficiency and head under the design point 1.0Qd are selected as the objective functions. Approximation models between the object and the parameters are built using Kriging model. The genetic algorithm is applied to optimize the approximation models to obtain the best combination of parameters. The results show that efficiency η has up to 51.54% at design flow rate. Comparing with prototype, the efficiency was increased by 1.02 percentage point, therefore the optimized RCP will save about 0.5×106kW·h energy a year. The optimization method can provide an effective reference to the improvement of pump's performance.
To summarize the adverse effects of pegaspargase in the treatment of lymphoid malignancies and management experience.
Clinical data of patients who received chemotherapy including pegaspargase in the ...Department of Hematology of Beijing Tongren hospital during August 2011 to December 2015 were retrospective analyzed, and the adverse effects of pegaspargase and the management experience was summarized.
A total of 129 patients with 443 times of pegaspargase used during this period. The common adverse reactions included allergic reactions in 2 cases (1.6%), acute pancreatitis in 19 (14.7%) including 6 acute symptomatic pancreatitis and 13 chemical pancreatitis with elevated pancreatin, hypertriglyceridemia in 15 cases(11.6%), hyperglycemia in 85 (65.9%), hypoglycemia in 7 (5.4%), elevated aminotransferase in 25 (19.4%), hyperbilirubinemia in 21 (15.5%), hypoalbuminemia in 62 (48.1%), prolonged APTT in 61 (47.3%), prolonged PT in 22 (17.1%), prolonged TT in 15 (11.6%), hypofibrinogen in 75 (58.1%), thrombus in 11
A balanced cavitation bubble is released near the rigid wall in the sound field generated by the incidence plane wave and its reflecting wave. With the modified boundary integral equation, the ...dynamics of bubble is solved considering the compressibility of fluid in this paper. Also the Bernoulli equation as the boundary condition for cavitation bubble in sound field is deduced using Euler equation. Since the arbitrary incidence angle of acoustic wave, the three-dimensional model is utilized. The bubble will expand or contract at first according to the initial phase of acting acoustic pressure on bubble surface. And during the contraction phase, the liquid jet with high speed will be generated pointing to rigid wall but be deflected to the incidence direction of acoustic wave. The oblique degree of jet will be affected by the incidence angle and initial distance between bubble center and rigid wall. The oscillation amplitude of bubble will be affected by the incidence amplitude and incidence frequency, but be limited by the rigid wall. Since the compressibility of fluid, the perturbation will propagate to the far-field. Thus the oscillation amplitude of bubble will be reduced.
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