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高压旋喷防渗墙在多漂卵砾石围堰地基中的应用

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西北水电 2024年第2期 78-81,98页

作者：赵健飞孙青秀中国三峡新能源(集团)股份有限公司北京101100 陕西铁路工程职业技术学院陕西渭南714000

围堰在水利工程施工中广泛应用。为水工建筑物能在干地施工提供了坚实的保障,其防渗性能的好坏更是直接关系到基坑安全和下部结构施工质量。围堰防渗多采用帷幕灌浆+心墙(斜墙)、混凝土防渗墙或者高压喷射灌浆等方式。结合厂房围堰防渗... 详细信息

围堰在水利工程施工中广泛应用。为水工建筑物能在干地施工提供了坚实的保障,其防渗性能的好坏更是直接关系到基坑安全和下部结构施工质量。围堰防渗多采用帷幕灌浆+心墙(斜墙)、混凝土防渗墙或者高压喷射灌浆等方式。结合厂房围堰防渗施工实践,在含较多漂卵砾石的砂砾石基础中,采用“三管法”进行高压旋喷防渗墙施工,从现场试验、孔位布置、钻孔、喷射灌浆、特殊情况处理等方面优化施工工艺和方法,应用结果表明该方法最终经灌后质量检查,结果满足设计要求。

关键词：漂卵砾石高压旋喷防渗墙施工工艺质量检查

Review of Design and Control Optimization of Axial Flux PMSM in Renewable-energy Applications

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 29-49页

作者： jianfei zhao Xiaoying Liu Shuang Wang Lixiao Zheng School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China

Axial flux permanent magnet synchronous motors(AFPMSMs)have been widely used in wind-power generation,electric vehicles,aircraft,and other renewable-energy applications owing to their high power density,operating efficiency,and *** facilitate comprehensive research on AFPMSM,this article reviews the developments in the research on the design and control optimization of ***,the basic topologies of AFPMSMs are introduced and ***,the key points of the design optimization of core and coreless AFPMSMs are summarized from the aspects of parameter design,structure design,and material ***,because efficiency improvement is an issue that needs to be addressed when AFPMSMs are applied to electric or other vehicles,the development status of efficiency-optimization control strategies is ***,control strategies proposed to suppress torque ripple caused by the small inductance of disc coreless permanent magnet synchronous motors(DCPMSMs)are *** overview of the rotor-synchronization control strategies for disc contra-rotating permanent magnet synchronous motors(CRPMSMs)is ***,the current difficulties and development trends revealed in this review are discussed.

关键词： AFPMSM Design optimization Cogging torque Efficiency optimization Control strategy optimization

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微分形式新安江模型

水科学进展 2024年第3期35卷 374-386页

作者：梁忠民赵建飞段雅楠黄嘉璐李彬权王军胡义明河海大学水文水资源学院江苏南京210098 江苏省水利工程科技咨询股份有限公司江苏南京210029

现有新安江模型数学上是代数方程并限于一阶差分方法求解,不可避免存在数值误差,探索数值求解误差控制新途径,对于提高模型计算精度具有重要意义。基于微分系统框架,识别新安江模型的状态变量和通量,推导其控制方程和本构方程,提出微分... 详细信息

现有新安江模型数学上是代数方程并限于一阶差分方法求解,不可避免存在数值误差,探索数值求解误差控制新途径,对于提高模型计算精度具有重要意义。基于微分系统框架,识别新安江模型的状态变量和通量,推导其控制方程和本构方程,提出微分形式的新安江模型(ODE-XAJ),并采用四阶显式Runge Kutta法求解。数值实验结果显示,以解析解为基准,ODE-XAJ绝对误差处于或小于10^(-4)mm量级,可实现对解析解的高阶近似;以ODE-XAJ结果为基准,按归一化平均绝对误差评价,现有新安江模型的数值求解误差约为8.7%。典型流域应用结果显示,ODE-XAJ确定性系数提升0.02,洪量相对误差降低4.3%。研究表明,ODE-XAJ理论上分离了模型的数学方程与具体解法,可有效控制数值求解误差,提升模型模拟精度。

关键词：新安江模型数值误差微分形式 Runge Kutta法屯溪流域

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Tracing enterococci persistence along a pork production chain from feed to food in China

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Animal Nutrition 2022年第2期9卷 223-232页

作者： jianfei zhao Rui Liu Yanpeng Sun Xiaojun Yang Junhu Yao College of Animal Science and Technology Northwest Agriculture&Forestry UniversityYangling712100China

The prevalence and transmission of vancomycin-resistant Enterococcus(VRE)in enterococci being as probiotics has been neglected in the scientific *** application of enterococci in feed,food and health products may cause VRE transmission through the food *** study evaluated phenotypic resistance of Enterococcus species to 20 antibiotics along a pork production chain from feed to *** also assessed the genetic diversity of Enterococcus faecium isolates.A total of 510 samples(feed,n=70;swine manure,n=400;swine carcasses,n=20,and retail pork,n=20)were collected in Beijing,China.A total of 328 enterococci isolates with 275 *** and 53 Enterococcus faecalis were identified using 16 S *** susceptibility to all enterococci isolates was conducted using the KeB method for 20 antibiotics from 9 *** sequence typing(MLST)was conducted on the *** isolates to survey the dissemination of enterococci in the pig *** results showed that only 26 enterococci isolates were sensitive to the 20 antibiotics,while half of the isolates(164/328)had acquired multi-drug *** resistant rate to furazolidone was 68.60%,followed by 42.99%to *** vancomycin-resistant *** isolates were isolated from feed origin and 2 from manure origin,with minimum inhibitory concentrations to vancomycin of 1,024,64,and 64 mg/mL,*** MLST outcomes showed that the 275 *** isolates belonged to 11 sequence types(ST)including ST40,ST60,ST94,ST160,ST178,ST296,ST361,ST695,ST726,ST812 and *** ST of the feedsourced VRE was ST1014,while the 2 manure-sourced VRE was ***1014 evolved from ST78,which was the dominant clonal complex in most cities of China,leading to the spreading of *** findings revealed the potential safety hazards of commercial probiotic enterococci in China and showed that there is a risk of the VRE horizontally transferring from feed to food.

关键词： Antimicrobial resistance Multilocus sequence typing Vancomycin-resistant enterococci

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药物罐联合止带方治疗湿热型带下病的效果

中国当代医药 2024年第23期31卷 88-91页

作者：贾丽霞刘芳赵建飞江西省萍乡市中医院妇产科江西萍乡337000 江西省萍乡市安源区妇幼保健院产科江西萍乡337000

目的探讨药物罐联合止带方治疗湿热型带下病的效果。方法选取2021年6月至2023年6月萍乡市中医院妇产科收治的60例湿热型带下病患者作为研究对象,按照随机数字表法分为对照组与观察组,每组30例,对照组接受常规西药治疗,观察组在此基础上... 详细信息

目的探讨药物罐联合止带方治疗湿热型带下病的效果。方法选取2021年6月至2023年6月萍乡市中医院妇产科收治的60例湿热型带下病患者作为研究对象,按照随机数字表法分为对照组与观察组,每组30例,对照组接受常规西药治疗,观察组在此基础上给予药物罐联合止带方治疗。比较两组患者疗程结束后的治疗效果,治疗前后中医证候评分、阴道清洁度评分及生活质量的变化情况,治疗期间不良反应以及随访3个月复发情况的差异。结果观察组治疗总有效率高于对照组,差异有统计学意义(P0.05);观察组随访3个月复发率低于对照组,差异有统计学意义(P<0.05)。结论药物罐联合止带方治疗湿热型带下病疗效显著,能够有效改善患者阴道清洁度,提高生活质量,降低复发率,且安全性良好,值得临床推荐。

关键词：湿热型带下病药物罐止带方复发率安全性

Numerical analysis of geosynthetic-reinforced embankment performance under moving loads

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 682-696页

作者： Xuanming Ding Jinqiao zhao Qiang Ou jianfei Liu College of Civil Engineering Chongqing UniversityChongqing400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing400045China China United Engineering Corporation Limited Hangzhou310052China

The performance of geosynthetic-reinforced embankments under traffic moving loads is always a hotspot in the geotechnical engineering field.A three-dimensional(3D)model of a geosynthetic-reinforced embankment without drainage consolidation was established using the finite element software *** this model,the traffic loads were simulated by two moving loads of rectangular pattern,and their amplitude,range,and moving speed were realized by a Fortran *** embankment fill was simulated by an equivalent linear viscoelastic model,which can reflect its *** geogrid was simulated by the truss element,and the geocell was simulated by the membrane *** elements were utilized to weaken the boundary effect caused by the model geometry at the *** of the established numerical model was conducted by comparing the predicted deformations in the cross-section of the geosynthetic-reinforced embankment with those from the existing *** this basis,the dynamic stress and strain distribution in the pavement structure layer of the geosynthetic-reinforced embankment under a moving load was also ***,a parametric study was conducted to examine the influences of the different types of reinforcement,overload,and the moving load velocity on the geosynthetic-reinforced embankment.

关键词： Geosynthetic-reinforced layer Numerical model Moving load Embankment Deformation Stress

Dietary L-theanine alleviated lipopolysaccharide-induced immunological stress in yellow-feathered broilers

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Animal Nutrition 2018年第3期4卷 265-272页

作者： Rui Li Zehe Song jianfei zhao Dongxiao Huo Zhiyong Fan De-Xing Hou Xi He College of Animal Science and Technology Hunan Agricultural University Hunan Co-Innovation Center of Animal Production Safety Department of Food Science and Biotechnology Faculty of Agriculture Kagoshima University

L-theanine, a natural nonprotein amino acid with a high biological activity, is reported to exert anti-stress properties. An experiment with a 3 ? 2 factorial arrangement was conducted to investigate the effects of dietary L-theanine on growth performance and immune function in lipopolysaccharide(LPS)-challenged broilers. A total of 432 one-day-old male yellow-feathered broilers were randomly assigned to 3 dietary treatments(control, antibiotic and L-theanine diets) with 2 subgroups of each(6 replicate cages;12 birds/cage). Birds from each subgroup of the 3 dietary treatments were intra-abdominally injected with the same amount of LPS or saline at 24, 25, 26 d of age. Both dietary L-theanine and antibiotic improved(P < 0.05) the growth performance of birds before LPS injection(d 1 to 21). The effect of dietary L-theanine was better(P < 0.05) than that of antibiotic. Lipopolysaccharide decreased feed intake(FI) and body weight gain(BWG) from d 22 to 28(P < 0.05), BWG and feed to gain ratio(F:G) from d 29 to 56(P < 0.05), increased mortality in different growth periods(P < 0.05), elevated the levels of serum cortisol, a1-acid glycoprotein(a1-AGP), interleukin-6(IL-6) on d 24 and 25(P < 0.05), reduced immune organ indexes and contents of jejunal mucosal secretory immunoglobulin A(s Ig A) on d 28(P < 0.05). The decreased FI and BWG, as well as increased F:G and mortality in LPS-challenged birds, were alleviated by dietary L-theanine or antibiotic from d 29 to 56 and from d 1 to 56. Dietary L-theanine mitigated the elevated serum a1-AGP level on d 25, serum IL-6 concentration on d 24 and 26, and the decreased jejunal mucosal s Ig A content on d 28 of the LPS-challenged birds. The results indicated that L-theanine had potential to alleviate LPS-induced immune stress in broilers.

关键词： L-theanine Yellow-feathered broilers Lipopolysaccharide Immune stress Growth performance

Alterations on vitamin C synthesis and transportation and egg deposition induced by dietary vitamin C supplementation in Hy-Line Brown layer model

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Animal Nutrition 2021年第4期7卷 973-980页

作者： Yufei Zhu Wei Guo jianfei zhao Kailong Qin Jiakun Yan Xinhuo Huang Zhouzheng Ren Xin Yang Yanli Liu Xiaojun Yang College of Animal Science and Technology Northwest A&F UniversityYanglingChina Nano Vitamin Engineering Research Center of Shannxi Province Xi'anChina

In ovo feeding of vitamin C(VC)has positive effects on the growth performance,immune and antioxidant function in poultry,which indicates that increasing VC content in eggs may be of *** study was to investigate the effects of dietary VC supplementation on VC synthesis and transportation and egg *** Exp.1,in order to select a suitable animal model,VC content was detected in different eggs from different layer *** C content was lower in ISA Brown breeder eggs and Hy-Line Brown layer eggs(P<0.05)then in Arbor Acres breeder *** Exp.2,a total of 24 Hy-Line Brown layers(42-week-old)were randomly divided into 3 treatments with 8 replicates and fed a basal diet with VC at 0,200 and 400 mg/***-dependent VC transporter 1 and 2(SVCT1 and SVCT2)expressions were higher in ileum than in duodenum and jejunum(P<0.05).SVCT1 expression was higher but SVCT2 expression was lower in the magnum than in the ovary(P<0.05).L-Gulonolactone oxidase(GLO)and SVCT7 expressions were higher but SVCT2 was lower in the kidney than in the liver(P<0.05).Dietary VC supplementation at 400 mg/kg increased SVCT1 expression in duodenum,ovary and magnum,but decreased GLO and SVCT1 expression in liver(P<0.05).Dietary VC supplementation at 200 and 400 mg/kg increased SVCT2 expression in duodenum,but decreased GLO and SVCT1 expression in kidney and SVCT2 expression in liver(P<0.05).Dietary VC supplementation promoted VC absorption in duodenum and jejunum,but reduced endogenous VC synthesis in liver and *** dietary VC supplementation enhanced VC transportation in ovary and magnum,it did not increase VC deposition in produced eggs.

关键词： Vitamin C Sodium-dependent vitamin C transporter L-Gulonolactone oxidase Albumen Yolk

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猪用益生菌和益生元开发技术和方法研究进展

中国猪业 2024年第5期19卷 11-21页

作者：周雅蕗王成碧谢卓雅赵建飞尹恒刘静波西南科技大学生命科学与工程学院四川绵阳621010

益生菌是一种对机体有益的活性微生物,能抑制肠道有害微生物的生长,维持胃肠道菌群平衡,对动物健康生长和发育有积极影响。益生元则是一类促进消化道特定细菌生长与活性的食物成分,不被消化道吸收,但对宿主有益。在当前“禁抗”大背景下... 详细信息

益生菌是一种对机体有益的活性微生物,能抑制肠道有害微生物的生长,维持胃肠道菌群平衡,对动物健康生长和发育有积极影响。益生元则是一类促进消化道特定细菌生长与活性的食物成分,不被消化道吸收,但对宿主有益。在当前“禁抗”大背景下,开发益生菌和益生元作为替代方案是维护动物健康和生产性能的选择之一。本文综述了猪用益生菌和益生元开发技术的进展,揭示其在健康养殖中的必要性、重要性与可行性,为研究人员和从业者提供参考。

关键词：益生菌益生元猪肠道菌群生产应用微生物 “禁抗” 消化道