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This work describes a new technique, sol-pyrolysis method, for depositing CuO–CeO2on FeCrAl honeycomb supports. The monolithic catalysts prepared by the method presented good adhesion stability in ultrasonic and thermal shock tests. The principle of the deposition and the role of the support were studied and analyzed by SEM, XRD, TG-DTA, TPR and XPS techniques. The results showed that the active components adhered to the support via three stages. High surface energy of the crystal nuclei and the interaction between the active components and the support promoted adhesion stability. Moreover, the presence of the support influenced distribution and interaction of the active components, but had no obvious effect on catalytic performance. The CuO–CeO2/Al2O3/FeCrAl monolithic catalysts were applied for the preferential oxidation of carbon monoxide in rich-hydrogen gases and revealed high activity and good selectivity under the presence of 15%CO2 and 10%H2O.

BackgroundA trend of earlier onset of gout has been reported even though its incidence increases in a linear fashion with age until 70 years. Dietary factors have been supposed to be contributed to the early onset of gout.ObjectivesTo investigate diet characteristics of gout and their impact on the early onset of gout.MethodsConsecutive gout patients who fulfilled the 2016 ACR/EULAR classification criteria were recruited between Dec 2016 and Dec 2017 A cross-section survey on dietary factors before gout onset was conducted with semi-quantitative diet questionnaire. The questionnaire included alcohol, fructose-containing beverages, soup, animal organs, sea-foods, hotpot, tea and coffee, which impact on serum uric acid (sUA) and aren’t major macronutrient provider in Chinese dietary patterns. The patients with gout onset before age 30 years were defined as early-onset group while the others were defined as control group.ResultsAmong 180 gout patients recruited, there were 69 (38.3%) patients in early-onset group and 111 (61.7%) in control group. Compared with control group, gout patients in early-onset group presented significantly higher level of sUA, estimated glomerular filtration rate and proportion of obesity, but lower fraction excretion of uric acid and prevalence of hypertension (table 1, p<0.05). The results of diet questionnaire showed that more patients in early-onset group consumed fructose-containing beverages≥3 times/week, but less alcohol, animal organs and tea (all p<0.05, figure 1). There were no significantly difference in the consumption of soup, seafood, hotpot and coffee. Consuming fructose-containing beverages≥3 times/week [OR 8.3 (2.5, 27.1), p<0.001], alcohol ≥1 standard unit/d [OR 0.27 (0.10, 0.80), p=0.017] and tea ≥3 times/week [OR 0.33 (0.12, 0.92), p=0.033] were associated with early-onset gout after adjusted by variables which were significantly different between early-onset group and control group (table 1).Abstract OP0187 – Table 1Comparison of clinical characteristics between the early-onset group and control groupCharacteristicsall patients(n=180)early-onset group (n=69)control group (n=111)P Male, n(%)168 (93.3)68 (98.6)100 (90.1)0.027Age, years42.5±15.528.3±7.251.4±12.4<0.001Age of onset, years37.8±15.123.5±5.146.7±12.1<0.001Duration of gout, years3.0 (1.0,8.0)3.0 (2.0,5.0)3.0 (1.0,7.0)0.782Family history, n (%)63 (35.0)29 (42.0)34 (30.6)0.148Tophi, n (%)31 (17.2)10 (14.5)21 (18.9)0.544sUA, mg/dl9.0±2.49.9±2.18.7±2.1<0.001FEUA,%3.9 (2.8,5.2)3.2 (2.3,4.7)4.2 (3.0,5.7)0.002eGFR, ml/min-1/1.73m-283.2±19.791.3±17.378.3±19.5<0.001Hypertension, n (%)58 (32.2)11 (15.9)47 (42.3)<0.001Diabetes mellitus, n (%)26 (14.4)7 (10.1)19 (17.1)0.276Dyslipidemia, n (%)117 (65.0)44 (63.8)73 (65.8)0.873Body mass index kg/m225.4±3.525.7±4.125.2±3.00.352Obesity, n (%)46 (25.6)24 (34.8)22 (19.8)0.034 sUA: serum uric acid; FEUA: fraction excretion of uric acid; eGFR: estimated glomerular filtration rate.ConclusionsFructose-containing beverages may be an independent risk factor for gout early-onset in south China. Patient education should emphasise diet management.AcknowledgementsThe present study was supported by Guangdong Natural Science Foundation, China Grant no. 2014A030310086) to Qian-Hua Li.Disclosure of InterestNone declared

Polymers are difficult to degrade completely in Nature, and their catabolites may pollute the environment. In recent years, biodegradable polymers have become the hot topic in people's daily life with increasing interest, and a controllable polymer biodegradation is one of the most important directions for future polymer science. This article presents the main preparation methods for biodegradable polymers and discusses their degradation mechanisms, the biodegradable factors, recent researches and their applications. The future researches of biodegradable polymers are also put forward.

Based on the principle of abnormal field algorithms, Helmholtz equations for electromagnetic field have been deduced. We made the electric field Helmholtz equation the governing equation, and derived the corresponding system of vector finite element method equations using the Galerkin method. For solving the governing equation using the vector finite element method, we divided the computing domain into homogenous brick elements, and used Whitney-type vector basis functions. After obtaining the electric field's anomaly field in the Laplace domain using the vector finite element method, we used the Gaver–Stehfest algorithm to transform the electric field's anomaly field to the time domain, and obtained the impulse response of magnetic field's anomaly field through the Faraday law of electromagnetic induction. By comparing 1D analytic solutions of quasi-H-type geoelectric models, the accuracy of the vector finite element method is tested. For the low resistivity brick geoelectric model, the plot shape of electromotive force computed using the vector finite element method coincides with that of the integral equation method and finite difference in time domain solutions.

A bstract Using e + e − collision data collected by the BESIII detector at BEPCII corresponding to an integrated luminosity of 30 fb − 1 , we measure Born cross sections and effective form factors for the process e + e − → Ξ 0 Ξ ¯ 0 at forty-five center-of-mass energies between 3.51 and 4.95 GeV. The dressed cross section is fitted, assuming a power-law function plus a charmonium(-like) state, i.e., ψ (3770), ψ (4040), ψ (4160), ψ (4230), ψ (4360), ψ (4415) or ψ (4660). No significant charmonium(-like) state decaying into Ξ 0 Ξ ¯ 0 is observed. Upper limits at the 90% confidence level on the product of the branching fraction and the electronic partial width are provided for each decay. In addition, ratios of the Born cross sections and the effective form factors for e + e − → Ξ 0 Ξ ¯ 0 and e + e − → Ξ − Ξ ¯ + are also presented to test isospin symmetry and the vector meson dominance model.

The beta decay of the lightest charmed baryon Λ c + provides unique insights into the fundamental mechanism of strong and electro-weak interactions, serving as a testbed for investigating non-perturbative quantum chromodynamics and constraining the Cabibbo-Kobayashi-Maskawa (CKM) matrix parameters. This article presents the first observation of the Cabibbo-suppressed decay Λ c + → n e + ν e , utilizing 4.5 fb −1 of electron-positron annihilation data collected with the BESIII detector. A novel Graph Neural Network based technique effectively separates signals from dominant backgrounds, notably Λ c + → Λ e + ν e , achieving a statistical significance exceeding 10 σ . The absolute branching fraction is measured to be (3.57 ± 0.34 stat.  ± 0.14 syst. ) × 10 −3 . For the first time, the CKM matrix element V c d is extracted via a charmed baryon decay as 0.208 ± 0.01 1 exp. ± 0.00 7 LQCD ± 0.00 1 τ Λ c + . This work highlights a new approach to further understand fundamental interactions in the charmed baryon sector, and showcases the power of modern machine learning techniques in experimental high-energy physics. The semileptonic decay channels of the Λ c baryon can give important insights into weak interaction, but decay into a neutron, positron and electron neutrino has not been reported so far, due to difficulties in the final products’ identification. Here, the BESIII Collaboration reports its observation in e+e- collision data, exploiting machine-learning-based identification techniques.

A bstract Based on a sample of (2712 . 4 ± 14 . 3) × 10 6 ψ (3686) events collected with the BESIII detector, a partial wave analysis of the decay ψ 3686 → Λ Σ ¯ 0 π 0 + c . c . is performed to investigate Λ * and Σ * resonances in the π 0 Σ ¯ 0 and π 0 Λ invariant mass distributions. Significant contributions are found from the Λ(1405), Λ(1520), Λ(1600), Λ(1670), Λ(1690), Λ(1800), Λ(1890), Λ(2325), Σ(1385), Σ(1660), Σ(1670), Σ(1750), and Σ(1910). The masses, widths, and production branching fractions for each component are determined. In addition, the branching fraction of ψ 3686 → Λ Σ ¯ 0 π 0 + c . c . is measured to be (1 . 544 ± 0 . 013 ± 0 . 071) × 10 − 4 for the first time, where the first uncertainty is statistical and the second systematic.

A bstract Based on (1 . 0087 ± 0 . 0044) × 10 10 J/ψ events collected with the BESIII detector at the BEPCII e + e − storage ring, we search for K S 0 invisible decays via the J/ψ → ϕ K S 0 K S 0 process. No significant signal is observed, and the upper limit of the branching fraction of these invisible decays is set at 8.4 × 10 − 4 at the 90% confidence level. This is the first experimental search for K S 0 invisible decays.

Using e + e − collision data at 13 center-of-mass energies ranging from 4.600 to 4.951 GeV collected with the BESIII detector, we conduct the first search for the e + e − →$$ {K}_S^0{K}_S^0{h}_c $$K S 0 K S 0 h c process and investigate the resonance structures in the cross section line shape. No significant signal is observed, and the upper limits of the Born cross sections at each center-of-mass energy are presented. The ratio$$ \\frac{\\sigma \\left({e}^{+}{e}^{-}\\to {K}_S^0{K}_S^0{h}_c\\right)}{\\sigma \\left({e}^{+}{e}^{-}\\to {K}_S^0{K}_S^0J/\\psi \\right)} $$σ e + e − → K S 0 K S 0 h c σ e + e − → K S 0 K S 0 J / ψ is determined to be 0.15 ± 0.22. This result indicates that if vector states exist in this energy region, their decay into h c is significantly suppressed compared to decays into J / ψ .

Based on (1 . 0087 ± 0 . 0044) × 10 10 J/ψ events collected with the BESIII detector at the BEPCII e + e − storage ring, we search for$$ {K}_S^0 $$K S 0 invisible decays via the J/ψ →$$ \\phi {K}_S^0{K}_S^0 $$ϕ K S 0 K S 0 process. No significant signal is observed, and the upper limit of the branching fraction of these invisible decays is set at 8.4 × 10 − 4 at the 90% confidence level. This is the first experimental search for$$ {K}_S^0 $$K S 0 invisible decays.