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由于现有规范标准对大跨度敞开式体育场金属屋面系统的设计和施工缺乏规定,近年来金属屋面被大风掀起破坏的现象时有发生,造成了巨大的财产损失和人员伤亡。蚌埠体育中心采用直立锁边金属屋面系统,覆盖龙鳞板作为装饰层,龙鳞装饰板为空间双曲面造型。金属屋面整体造型复杂,不同区域不均匀风场突出。为保证蚌埠体育中心龙鳞金属屋面的性能可靠和连接安全,采用气囊法进行了龙鳞金属屋面抗风揭、风压性能试验,考察了固定支座、锁夹类型与数量等参数对龙鳞金属屋面抗风揭、风压性能的影响,研究了龙鳞金属屋面在风荷载作用下的破坏模式,揭示了其破坏机理和规律。试验结果表明,龙鳞金属屋面抗风揭、风压性能薄弱的部位为固定支座与屋面板锁边处、锁夹与屋面板连接处,应采取适当措施以提高龙鳞金属屋面的抗风揭、风压性能。研究成果可为安徽省第十四届省运会主场馆蚌埠体育中心龙鳞金属屋面的设计、施工和健康运营提供科学依据。

蚌埠奥体中心体育场作为承接第十四届安徽省省运会的主场馆,采用"大悬挑预应力实腹型钢梁-三向多点圆管支撑"结构体系,由大、小钢罩棚结构组成,外部铺设铝锰镁金属板,呈现蛟龙鳞片状建筑效果。为了保证蚌埠体育场钢结构在施工全过程中的工程质量和结构安全,深入分析了现场采用的施工方式和施工顺序。采用MIDAS软件建立了蚌埠体育场大悬挑预应力钢罩棚结构的整体模型,对钢构件拼装、预应力张拉和逐步卸载的全过程进行了多步骤的力学性能分析;对关键构件和关键节点的应力和竖向位移实施了监测,将现场实测值与有限元计算值进行了对比分析;总结了施工全过程结构应力和位移的变化规律。分析结果表明:现场监测和数值仿真模拟有效地验证了该施工方法的正确性和施工顺序的可靠性,研究成果可以为类似工程应用提供参考依据。

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the first-principles calculations of density functional theory,we have investigated the modulation of the electronic properties of bilayer pent-graphene by hydrogenation,fluorination and hydrofluorination.The calculated results show that hydrogenated and fluorinated bilayer penta-graphene can form localized electronic states at the bottom of the conduction band and the top of the valence band,respectively,and significantly reduce the band gap. Based on the unique properties,we further investigate the hydrofluorinated bilayer penta-graphene to modulate the band gap. Consequently,we propose a facile approach for effectively tuning the band gap via modulating the coverage of hydrofluorination and hence realizing the semiconductor-to-metal transition of bilayer penta-graphene. [ABSTRACT FROM AUTHOR]

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[Objective] A high performance liquid chromatography-tandem mass spectrometry (HPLC-MS / MS) method was developed for the simultaneous determination of four Sudan red dyes in capsicum red pigment. [Method] The capsaicin pigment samples were extracted by nhexane, purified by a special molecular imprinting column for Sudan red, separated by RP-HPLC on ZORABX SB-Aq C18(3. 0 mm×100 mm, 3. 5 μm), water gradient elution of acetonitrile -0. 1% formic acid, ESI + electrospray scanning. Sudan red in capsicum pigment was determined by multiple reaction monitoring (MRM) and quantified by external standard method. [Result]The four Sudan red dyes showed a good linear relationship in the concentration range of 10. 0 - 200 ng / mL, the detection limit was 5 μg / kg, and the quantification limit was 10 μg / kg. The average recovery was 71. 0% - 119. 0% and the relative standard deviation was 1. 53% - 6. 18% when the scalars were 10 μg / kg, 20 μg / kg and 50 μg / kg (n = 6). [Conclusion] This method is suitable for the qualitative and quantitative analysis of four Sudan red dyes in chili red pigment. [ABSTRACT FROM AUTHOR]

With the increasing aging of the population, sarcopenia is becoming an important social problem in recent years. It has been recognized as a clinical disease by the World Health Organization since 2016. Sarcopenia is a kind of senile comprehensive disease with the increase of age. The quality and strength of human muscles appear progressive decline, which has a significant impact on the physiology and life of the elderly. Many studies have found that tumor necrosis factor plays an important role in the occurrence and development of sarcopenia. In this paper, by summarizing domestic and foreign literature reports, we summarize the mechanism of tumor necrosis factor inducing the occurrence of sarcopenia by affecting nerve, hormone, protein, immune, and autophagy pathways, in order to provide a reference for future research on the occurrence and development of sarcopenia. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Educational Science of Hunan Normal University is the property of Hunan Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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BACKGROUND: Bacterial infections and impaired angiogenesis have been obstacles to diabetic wound healing, and the problem of multidrug resistance cannot be ignored, so there is an urgent need to find a new therapeutic strategy. OBJECTIVE: To prepare platelet-camouflaged silver nanoparticle hydrogel and observe its therapeutic effect on diabetic wounds. METHODS: (1) In vitro test: The ultra-small silver nanoparticles (usAgNPs) were obtained by reflux heating. usAgNPs-PL/CMC hydrogel was prepared by coupling it with platelets (PL) and adding it to the carboxymethyl cellulose (CMC) hydrogel. The microstructures, swelling properties, and mechanical properties of the hydrogel were characterized. The antibacterial activity of the hydrogel was tested by 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)5[(phenylamino)carbonyl]- 2H-tetrazolium hydroxide method, reactive oxygen species method, bacterial biofilm method, and bacterial activity. (2) In vivo test: Forty SD rats were randomly divided into sham operation group, model group, CMC hydrogel group, usAgNPs/CMC hydrogel group, and usAgNPs-PL/CMC hydrogel group, with eight rats in each group. The type 1 diabetes model was established in the other four groups except the sham operation group. After successful model establishment, a skin wound (20 mm in diameter) deep to the fascia layer was made on the back of rats of the five groups. Rats in the sham operation group and model group were injected with normal saline. The rats in the CMC hydrogel group, usAgNPs/CMC hydrogel group, and usAgNPs-PL/CMC hydrogel group were implanted with the corresponding hydrogel, separately. The wound healing condition and healing quality were observed after 14 days of treatment. RESULTS AND CONCLUSION: (1) In vitro test: The usAgNPs-PL/CMC hydrogel had a uniform three-dimensional network structure, good mechanical properties, and strong water absorption ability, which could remarkably inhibit the growth of Escherichia coli and Staphylococcus aureus, and had a good inhibition and clearance effect on the formation of biofilms of the two bacteria, and had a good antibacterial ability. (2) In vivo test: After 14 days of treatment, the wounds of the usAgNPs-PL/CMC hydrogel group were basically closed. The wound healing rate was the highest, and the number of wound colonies was significantly lower than that of the model group. After 14 days of treatment, hematoxylin-eosin and Masson staining showed that the tissue structure of regenerated dermis appeared on the wounds of the usAgNPs-PL/CMC hydrogel group, usAgNPs/CMC hydrogel group, and CMC hydrogel group, and the epidermis of the new granulation tissue was complete and thick. Parallel mature collagen fibers were observed in the usAgNPs-PL/CMC hydrogel group. After 7 days of treatment, CD31 immunohistochemistry and Ki67 immunofluorescence staining showed that the usAgNPs-PL/CMC hydrogel group had the highest number of microvessels and fibroblasts. (3) The results showed that usAgNPs-PL/CMC hydrogel could accelerate wound healing in type 1 diabetic rats by rapidly inhibiting bacteria and promoting angiogenesis. [ABSTRACT FROM AUTHOR]

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Based on the first - principles calculations of density functional theory, we have investigated the adsorption and dissociation processes of water on penta - BCN substrate. Results show that the B atom of the penta – BCN structure is the active binding site for H2O adsorption. Initially, the adsorbed H2O molecule can easily dissociated at this active binding site, and the dissociation process is an exothermic reaction with a small barrier of only 0. 191 eV, then, a stable OH/H_product is formed on the penta - BCN substrate. Interestingly, further research found that the surface structure after the initial dissociation of H2O molecules can directly decompose the subsequently adsorbed H2O molecules. This study provides a theoretical guidance for the adsorption and dissociation mechanisms of H2O molecules on penta-BCN. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Computational Mechanics / Jisuan Lixue Xuebao is the property of Chinese Journal of Computational Mechanics Editorial Office, Dalian University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Based on the first-principles calculations of density functional theory, we have investigated the adsorption and dissociation processes of H2S molecules on penta-BCN substrate. Results show that the B atom of the penta-BCN structure is the active binding site for H2S adsorption. Initially, the adsorbed H2S molecule can easily dissociated at this active binding site, and the dissociation process is an exothermic reaction with a small barrier of only 0.208 eV, then, a stable HS/H product is formed on the penta-BCN substrate. Interestingly, further research found that the surface structure after the initial dissociation of H2S molecules can directly decompose the subsequently adsorbed H2S molecules. This study provides a theoretical guidance for the adsorption and dissociation mechanisms of H2S molecules on penta-BCN, and it is proposed for the first time that penta-BCN can be an ideal candidate to eliminate H2S. [ABSTRACT FROM AUTHOR]

Refeeding syndrome (RFS) is a series of life-threatening clinical symptoms caused by abnormal metabolism in the early stage of re-intake of nutrition in the patients with chronic malnutrition. Due to the lack of specificity it is difficult to identify, and has higher mortality in ICU patients. At present, there are few studies on the management and prognosis of RFS by domestic scholars, moreover the specific management measures are still controversial. In addition, there are also differences in the methods and conclusions of RFS prognostic studies. Thus this paper systematically reviews the diagnostic criteria, occurrence status, management status and disease prognosis of RFS, aiming at offering the experience to medical staffs on RFS management and providing reference for follow-up related research. [ABSTRACT FROM AUTHOR]

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The combined study of immune-osteoporosis is a new research field for the role of immune system in osteoporosis (OP). Interleukin-17 (IL-17) is an inflammatory factor, which is secreted by activated immune T lymphocytes 17 (Th17). Modern studies have shown that IL-17 inhibits osteogenic differentiation of mesenchymal stem cells (MSCs) and inhibits osteoblast by acting on related proteins, genes, signaling pathways, and other pathways. IL-17 inhibits osteoblast (OB) differentiation and its related functions, but promotes osteoclast (OC) differentiation and its function, thus affecting the occurrence of OP. The authors review the mechanism of IL-17 in OP, hoping to provide some reference value for future clinical research in the field of immune- osteoporosis". [ABSTRACT FROM AUTHOR]

In view of the complicated factors influencing the stock price, we revised the Long Short-Term Memory (LSTM) network, which is commonly used in time series, to predict stock prices under the condition of multivariable. First, the Variance Inflation Factor (VIF) was used to screen variables, and then the adaptive promotion (Adaboost) model was combined to check the importance of characteristic variables. Second, the crawler was used to conduct text analysis of investor sentiment, calculate indicators including sentiment index, and reveal the relationship between them and stock price. Then, prices of three stocks including Gree Electric Appliances, Flyco Electric Appliances and Midea Group were predicted by Multilayer Perceptron (MLP) and LSTM, and the appropriate model was selected as the benchmark model. Finally, indicators of sentiment index and investor concern were added to the benchmark model to construct the LSTM-EM model, and the GM (1,1) model was used to correct the residual term after considering investor sentiment. The empirical results show that the proposed model can predict the stock price accurately. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the first-principles calculations of density functional theory, we investigate the adsorption and kinetic behaviors of Pt atoms on penta-graphene (PG). Results show that although Pt atom has a large adsorption energy and a high diffusion barrier on PG, it cannot form atomically dispersed single-atom catalyst (SAC) on the substrate. This is because, with the increase of the number of Pt atoms, the average binding energy of Ptn(n=1, 2, 3) on the substrate also gradually increases, so it is more inclined to form clusters. This finding effectively denies the previous report that stable Pt SAC on PG. Based on this, we consider applying biaxial strain to PG to modulate the stability of Pt SAC. As the tensile strain increases, the average binding energy for Ptn(n=1, 2, 3) gradually decreases. When the tensile strain is applied to about 12%, thus realizing the real atomically dispersed Pt SAC. The results provide a theoretical guidance for strain engineering to achieve stable SAC in the PG-based systems. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the first-principles calculations of density functional theory, we investigate the adsorption and kinetic behaviors of Pt atoms on pentagonal graphene (PG). Results show that although Pt atom has a large adsorption energy and a high diffusion barrier on PG, it cannot form atomically dispersed single-atom catalyst (SAC) on the substrate. This is because, with the increase of the number of Pt atoms, the average binding energy of Ptn (n=1, 2, 3) on the substrate also gradually increases, so it is more inclined to form clusters. This finding effectively denies the previous report that stable Pt SAC on PG. Based on this, we apply biaxial strain to PG to modulate the stability of Pt SAC. As the tensile strain increases, the average binding energy for Ptn (n=1, 2, 3) gradually decreases. When the tensile strain is about 12%, the real atomically dispersed Pt SAC is realized. The results provide a theoretical guidance for strain engineering to achieve stable SAC in the PG-based systems. [ABSTRACT FROM AUTHOR]