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Transformation and migration of phosphorus in excess sludge reduction pretreatment by alkaline ferrate oxidation combined with anaerobic digestion

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Journal of Environmental Sciences 2020年第6期32卷 224-234页

作者： Xiang Li Yan Yuan Yong Huang chao-ran Guo Run Jin Ting-ting Liu Jun Ma School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology Suzhou 215009China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China

Recently,more and more attention has been paid to the strong oxidation ability of newly prepared potassium ferrate(NAPF) in sludge reduction process,but less attention has been paid to the change of phosphorus in this *** feasibility of phosphorus migration and transformation during excess sludge reduction pretre atment using NAPF pre-oxidation combined with anaerobic digestion was *** 70 mg/g suspended solids NAPF pretreatment and 16 days anaerobic digestion,the solid-phase volatile suspended solids decreased by 44.2%,and much organic matter had been released into the liquid-phase and then degraded during digestion by indigenous *** the sludge pre-oxidation process was performed,solid-phase organic phosphorus and chemically combined phosphorus also released into the liquid-phase as PO4^3-,peaking at 100 mg/*** anaerobic digestion,the Fe3+in the liquid-phase was gradually reduced to Fe2+,and then formed Fe^2+-PO4^3- compound crystals and re-migrated to the *** concentration of PO4^3- decreased to 17.08± 1.1 mg/L in the liquid-phase after anaerobic ***,the phosphorus in the Fe^2+-PO4^3- compound accounts for 80% of the total phosphorus in the solid-phase.A large number of vivianite crystals in sludge were ***,this technology not only effectively reduces sludge,but also increases the proportion of PO43-in the sludge in the form of Vivianite.

关键词： Excess sludge Alkaline ferrate(NAPF) pre-oxidation Anaerobic digestion phosphorus Migration and transformation

Application of dynamic vibration absorber for vertical vibration control of corrugated rolling mill

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Journal of Iron and Steel Research International 2023年第4期30卷 736-748页

作者： Dong-ping He Hui-dong Xu Ming Wang Tao Wang chao-ran Ren Zhi-hua Wang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of EducationTaiyuan 030024ShanxiChina

A variable mass tuned particle absorber is designed for the nonlinear vertical vibration control of the corrugated rolling mill in the composite plate rolling *** the nonlinear damping and nonlinear stiffness between the corrugated interface,a three-degree-of-freedom nonlinear vertical vibration mathematical model of corrugated rolling mill based on dynamic vibration absorber control is *** multi-scale method is used to solve the amplitude–frequency characteristic curve equation of the installed dynamic vibration absorber(DVA)*** effects of stiffness coefficient and damping coefficient on the amplitude–frequency characteristic curve are *** expressions of the dynamic developed factor of the corrugated roll are derived,and the influence laws of mass ratio,frequency ratio and damping ratio on the dynamic amplification factor are *** optimal parameters of the DVA are obtained by adaptive genetic *** control effect of the DVA on the nonlinear vertical vibration is studied by numerical *** feasibility of the designed dynamic absorber is verified through *** results show that the designed dynamic absorber can effectively suppress the vertical vibration of the corrugated roller.

关键词： Corrugated rolling mill Nonlinear vertical vibration Adaptive genetic algorithm Multiscale method Dynamic vibration absorber

宏基因组二代测序技术对结核病诊断价值的Meta分析

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医学信息 2024年第5期37卷 20-26页

作者：王超然杨宗强牛宁奎宁夏医科大学总医院骨科宁夏医科大学临床医学院

目的应用Meta分析评价宏基因组二代测序技术在结核病诊断中的应用价值。方法检索PubMed MEDLINE、Ovid MEDLINE、Web of Science、Cochrane Library、EMbase、Scopus、中国知网、万方、维普数据库中有关宏基因组二代测序技术应用于诊... 详细信息

目的应用Meta分析评价宏基因组二代测序技术在结核病诊断中的应用价值。方法检索PubMed MEDLINE、Ovid MEDLINE、Web of Science、Cochrane Library、EMbase、Scopus、中国知网、万方、维普数据库中有关宏基因组二代测序技术应用于诊断结核病的相关文献，检索时限为建库至2021年10月31日，由2名研究者独立进行文献检索、筛选、数据提取、质量评价。使用MetaDISc 1.4软件进行阈值效应和异质性检验、数据的合并分析，使用StataMP 16软件绘制Deek’s漏斗图评估发表偏倚。结果共检索出623篇文献，依据纳入和排除标准最终纳入14项研究，涉及2159个样本，其中结核病样本964个。Meta分析结果显示，宏基因组二代测序技术诊断结核病的合并敏感度为0.600(95%CI:0.568～0.631)，合并特异度为0.985(95%CI:0.976～0.991)，合并阳性似然比为30.513(95%CI:18.536～50.226)，合并阴性似然比为0.414(95%CI:0.357～0.481)，合并诊断比值比为77.408(95%CI:46.090～130.010)，合并曲线下面积为0.9680，合并Q*值为0.9167。Deek’s漏斗图提示不存在发表偏倚（P>0.05）。结论宏基因组二代测序技术对结核病具有较高的诊断价值，可作为快速诊断的有效方法。

关键词：宏基因组二代测序分子诊断技术结核病

A multiaxial lead-free two-dimensional organic-inorganic perovskite ferroelectric

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National Science Review 2021年第5期8卷 140-146页

作者： chao-ran Huang Xuzhong Luo Xiao-Gang Chen Xian-Jiang Song Zhi-Xu Zhang Ren-Gen Xiong Key Laboratory of OrganoPharmaceutical Chemistry of Jiangxi Province College of Chemistry and Chemical EngineeringGannan Normal University Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics Southeast University

Two-dimensional(2 D) hybrid organic-inorganic perovskites(HOIPs) have recently gained tremendous interest because of their unique features in contrast to three-dimensional counterparts and traditional 2 D materials. However, although some 2 D HOIP ferroelectrics have been achieved, the issue of toxic Pb and uniaxial nature impede their further application. Herein, for the first time, we report a lead-free 2 D HOIP multiaxial ferroelectric, [3,3-difluorocyclobutylammonium]2CuCl4(1), which shows four ferroelectric axes and eight equivalent polarization directions, more than those of the other 2 D HOIP ferroelectrics and even the inorganic perovskite ferroelectric BaTiO3(three ferroelectric axes and six equivalent polarization directions). 1 also features a high Curie temperature of 380 K and exhibits remarkable thermochromism of color change from green-yellow to dark brown. To our knowledge, 1 is the first multiaxial lead-free2 D HOIP ferroelectric. This work sheds light on the exploration of better lead-free 2 D HOIP ferroelectrics.

关键词： ferroelectrics organic-inorganic perovskites multiaxial ferroelectrics Curie temperature thermochromism

Antibiotic growth promoter olaquindox increases pathogen susceptibility in fish by inducing gut microbiota dysbiosis

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Science China(Life Sciences) 2017年第11期60卷 1260-1270页

作者： suxu he quanmin wang shuning li chao ran xiaoze guo zhen zhang zhigang zhou key laboratory for feed biotechnology of the ministry of agriclture feed research institutechinese academy of agricutural sciencesBeijing 100081China

Low dose antibiotics have been used as growth promoters in livestock and fish. The use of antibiotics has been associated with reduced pathogen infections in livestock. In contrast, antibiotic growth promoter has been suspected of leading to disease outbreaks in aquaculture. However, this phenomenon is circumstantial and has not been confirmed in experimental conditions. In this study,we showed that antibiotic olaquindox increased the susceptibility of zebrafish to A. hydrophila infection. Olaquindox led to profound alterations in the intestinal microbiota of zebrafish, with a drastic bloom of Enterobacter and diminishing of Cetobacterium. Moreover, the innate immune responses of zebrafish were compromised by olaquindox(Pransfer of microbiota to GF zebrafish indicated that while the immuo-suppression effect of olaquindox is a combined effect mediated by both OLA-altered micro biota and direct action of the antibiotic(P<0.05), the increased pathogen susceptibility was driven by the OLA-altered microbiota and was not dependent on direct antibiotic effect. Taken together, these data indicate that low level of OLA induced gut microbiota dysbiosis in zebrafish, which led to increased pathogen susceptibility.

关键词： antibiotic growth promoter pathogen susceptability gut microbiota fish olaquindox

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土木工程建筑中混凝土结构的施工技术探讨

中国厨卫 2024年第1期23卷 115-117页

作者：冉超贵阳市建筑设计院有限公司贵阳550081

混凝土结构是土木工程建筑中常见且重要的结构形式,对其施工技术的研究具有重要意义。文章探讨了土木工程建筑中混凝土结构的施工技术,并重点关注了关键工艺、质量控制和新技术的应用,提出了优化混凝土结构施工技术的方法和措施,以期推... 详细信息

混凝土结构是土木工程建筑中常见且重要的结构形式,对其施工技术的研究具有重要意义。文章探讨了土木工程建筑中混凝土结构的施工技术,并重点关注了关键工艺、质量控制和新技术的应用,提出了优化混凝土结构施工技术的方法和措施,以期推动施工技术的进步并促进行业的健康发展。

关键词：混凝土结构施工技术关键工艺质量控制

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瑞马唑仑在老年患者无痛胃肠镜检查中的应用

中国新药与临床杂志 2024年第6期43卷 442-445页

作者：苏丹梁涛陈超然季中华张微姚秀秀王颖林同济大学附属东方医院麻醉科上海200120

目的评价瑞马唑仑用于老年患者无痛胃肠镜检查的效果。方法选择拟行无痛胃肠镜检查的老年患者,随机分为2组。对照组麻醉诱导方案为舒芬太尼0.1μg·kg^(-1)+丙泊酚1.5 mg·kg^(-1),检查过程中丙泊酚追加剂量为每次0.5 mg·kg^(-1);试验... 详细信息

目的评价瑞马唑仑用于老年患者无痛胃肠镜检查的效果。方法选择拟行无痛胃肠镜检查的老年患者,随机分为2组。对照组麻醉诱导方案为舒芬太尼0.1μg·kg^(-1)+丙泊酚1.5 mg·kg^(-1),检查过程中丙泊酚追加剂量为每次0.5 mg·kg^(-1);试验组的给药方案为舒芬太尼0.1μg·kg^(-1)+瑞马唑仑0.15 mg·kg^(-1)诱导,检查过程中瑞马唑仑每次追加剂量为首剂的1/3。记录麻醉过程中患者心率、呼吸频率、平均动脉压、血氧饱和度,以及诱导、苏醒、出室时间,观察注射痛、低氧血症、低血压等不良反应的发生情况。结果最终441例患者纳入分析,对照组225例,试验组116例。给药后5、10 min,试验组平均动脉压高于对照组,差异有显著意义(P<0.05)。试验组诱导、苏醒和出室时间分别为(41.8±4.3)s、(5.7±4.4)和(10.2±6.5)min,对照组分别为(32.6±2.7)s、(6.6±3.9)和(12.9±7.4)min,试验组诱导时间长于对照组,苏醒和出室时间短于对照组,均有显著差异(P<0.05)。与对照组相比,试验组注射痛(54.2%vs.2.3%)、低血压(16.4%vs.6.9%)和低氧血症(19.6%vs.14.8%)发生率显著降低(P<0.05)。结论瑞马唑仑用于老年患者无痛胃肠镜检查安全有效,具有苏醒快、不良反应发生率低等优点。

关键词：瑞马唑仑胃镜检查结肠镜检查老年人低血压

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Thermal shock synthesis of carbon nanotubes supporting small-sized rhenium nanoparticles for efficient electrocatalytic hydrogen evolution

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Rare Metals 2023年第7期42卷 2166-2173页

作者： Gang Zhong Rui Zhao Yun-Ru Shi chao-ran Li Le He Lin He Yang Huang Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou215123China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics(LICP)Chinese Academy of SciencesLanzhou730000China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou215123China

Rhenium(Re)has recently emerged as a promising catalyst in hydrogen evolution reactions(HER)due to its metalhydrogen interaction,which resembles that of *** availability of small-sized Re nanoparticles with abundant a... 详细信息

关键词： conditions sized synthesis

Numerical and theoretical investigations of heat transfer characteristics in helium-xenon cooled microreactor core

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Nuclear Science and Techniques 2023年第11期34卷 1-19页

作者： Tian‑Shi Wang Xiang Chai chao‑ran Guan Xin‑Yue Liu Jiao‑Long Deng Hui He Xiao‑Jing Liu School of Nuclear Science and Engineering Shanghai JiaoTong UniversityShanghai 200240China

Helium-xenon cooled microreactors are a vital technological solution for portable nuclear reactor power *** exam-ine the convective heat transfer behavior of helium-xenon gas mixtures in a core environment,numerical simulations are conducted on a cylindrical coolant channel and its surrounding solid *** numerical methods are used to determine the effect and mechanisms of power and its distribution,inlet temperature and velocity,and outlet pressure on the distribution and change trend of the axial Nusselt ***,a theoretical framework that can describe the effect of power variation on the evolution of the thermal boundary layer is employed to formulate an axial distribution cor-relation for the Nusselt number of the coolant channel,under the assumption of a cosine distribution for the axial *** on the simulation results,the correlation coefficients are determined,and a semi-empirical relationship is identified under the corresponding operating *** correlation derived in this study is consistent with the simulations,with an average relative error of 5.3%under the operating ***,to improve the accuracy of the predictions near the entrance,a segmented correlation is developed by combining the Kays correlation with the aforementioned *** new correlation reduces the average relative error to 2.9%and maintains satisfactory accuracy throughout the entire axial range of the channel,thereby demonstrating its applicability to turbulent heat transfer calculations for helium-xenon gas mixtures within the core *** findings provide valuable insights into the convective heat transfer behavior of a helium-xenon gas mixture in a core environment.

关键词： Helium-xenon gas mixture Convective heat transfer Power distribution Numerical simulation Nusselt number correlation