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长距离高扬程供水工程水锤防护方案对比研究

人民珠江 2024年第S1期45卷 120-124页

作者：李连忠岳楠李阳张永云何祖寿云南省红河州水利水电勘察设计研究院云南蒙自661199

长距离高扬程泵站输水系统中,为保护泵站与输水管线安全运行,常见的水锤防护措施为:在出水管线上设置空气阀、空气罐、单向调压塔或双向调压塔等。空气阀补气时存在滞后性,水锤防护效果将大打折扣,因此在解决由负压引起的水锤问题时一... 详细信息

长距离高扬程泵站输水系统中,为保护泵站与输水管线安全运行,常见的水锤防护措施为:在出水管线上设置空气阀、空气罐、单向调压塔或双向调压塔等。空气阀补气时存在滞后性,水锤防护效果将大打折扣,因此在解决由负压引起的水锤问题时一般优先采用空气罐和调压塔。双向调压塔布置时,调压塔高度必须高于管路最高压力线,且为了减小塔中水位变化幅度,调压塔必须有较大的断面面积和容量,故双向调压塔主要适用于低扬程的泵站。在长距离高扬程供水工程中,采用空气罐可有效抑制水锤发生,但需设置的空气罐数量较多,体积较大,导致工程投资增加,而采用空气罐+单向调压塔的方案在有效抑制水锤发生的同时,可减小工程投资,提高泵站安全运行保障。

关键词：长距离高扬程水锤防护空气罐单向调压塔

罐式断路器加装内置式特高频局部放电传感器方法研究

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河北工业科技 2024年第3期41卷 227-233页

作者：李建鹏孟延辉付炜平张伟李强刘晓飞李连众郝自为国网河北省电力有限公司超高压分公司河北石家庄050071 国网河北省电力有限公司衡水供电分公司河北衡水053000 西安西电开关电气有限公司陕西西安710077

为了提高罐式断路器绝缘状态监测水平,保障设备可靠运行,提出了现场加装内置式特高频局部放电传感器实施方法。首先,通过加装位置选择、传感器选型、密封结构设计、电场仿真计算和安装环境控制,实现内置式特高频局部放电传感器的现场安... 详细信息

为了提高罐式断路器绝缘状态监测水平,保障设备可靠运行,提出了现场加装内置式特高频局部放电传感器实施方法。首先,通过加装位置选择、传感器选型、密封结构设计、电场仿真计算和安装环境控制,实现内置式特高频局部放电传感器的现场安装;其次,通过密封试验检查加装位置的密封性能;最后,利用真型测试检验传感器的安装效果。结果表明:加装特高频传感器以后,罐式断路器内手孔表面和耦合电极的最大场强为12.45 kV/mm,屏蔽罩的最大场强为18.51 kV/mm,均小于设计许用值;密封结构包扎5 h后定量检漏SF6气体体积分数为8μL/L,小于标准要求值15μL/L;传感器灵敏度满足检测需要,且对外界干扰信号具有一定的抑制作用。运罐式断路器在加装内置式特高频局部放电传感器以后,其绝缘性能、密封性能和检测灵敏度均满足设计要求。研究结果为解决特高频局部放电现场检测提供了一种较为实用高效的方法。

关键词：波谱分析内置式罐式断路器局部放电特高频密封结构

New Results on Oscillation of even Order Neutral Differential Equations with Deviating Arguments

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Advances in Pure Mathematics 2011年第3期1卷 49-53页

作者： lianzhong li Fanwei Meng 不详

In this paper, we point out some small mistakes in [6] and revise them, we obtain some new oscillation results for certain even order neutral differential equations with deviating arguments. Our results extend and imp... 详细信息

关键词： Oscillation Neutral Differential Equation Deviating Argument

Lactiplantibacillus plantarum AR113 alleviates microbiota dysbiosis of tongue coating and cerebral ischemia/reperfusion injury in rat

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Food Science and Human Wellness 2024年第4期13卷 2132-2140页

作者： Zhiqiang Xiong Gang liu ling Fang Xiuming li Yongjun Xia Guangqiang Wang Xin Song lianzhong Ai Shanghai Engineering Research Center of Food Microbiology School of Health Science and EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Department of Rehabilitation Huashan HospitalFudan UniversityShanghai 200040China Department of Rehabilitation Medicine Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China

Stroke is one of the leading causes of death and disability ***,information on stroke-related tongue coating microbiome(TCM)is limited,and whether TCM modulation could benefit for stroke prevention and rehabilitation is ***,TCM from stroke patients(SP)was characterized using molecular *** occurrence of stroke resulted in TCM dysbiosis with significantly reduced species richness and *** abundance of Prevotella,Leptotrichia,Actinomyces,Alloprevotella,Haemophilus,and TM7_[G-1]were greatly reduced,but common infection Streptococcus and Pseudomonas were remarkably ***,an antioxidative probiotic Lactiplantibacillus plantarum AR113 was used for TCM intervention in stroke rats with cerebral ischemia/reperfusion(I/R).AR113 partly restored I/R induced change of TCM and gut microbiota with significantly improved neurological deficit,relieved histopathologic change,increased activities of antioxidant enzymes,and decreased contents of oxidative stress ***,the gene expression of antioxidant-related proteins and apoptosis-related factors heme oxygenase-1(HO-1),superoxide dismutase(SOD),glutathione peroxidase(GSH-Px),nuclear factor erythroid 2-related factor 2(Nrf2),NAD(P)H:quinone oxidoreductase-1(NQO-1),and Bcl-2 was significantly increased,but cytochrome C,cleaved caspase-3,and Bax were markedly decreased in the brain by AR113 *** results suggested that AR113 could ameliorate cerebral I/R injury through antioxidation and anti-apoptosis pathways,and AR113 intervention of TCM may have the application potential for stroke prevention and control.

关键词： Stroke Cerebral ischemia/reperfusion Tongue coating Lactiplantibacillus plantarum AR113 Probiotic intervention

Lactobacillus plantarum AR495 improves stress-induced irritable bowel syndrome in rats by targeting gut microbiota and Mast cell-PAR2-TRPV1 signaling pathway

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Food Science and Human Wellness 2024年第2期13卷 698-708页

作者： Hongyun Zhang Guangqiang Wang Zhiqiang Xiong Zhuan liao Yangyan Qian Xin Song li Sui lianzhong Ai Yongjun Xia Shanghai Engineering Research Center of Food Microbiology School of Health Science and EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Department of Gastroenterol Digestive Endoscopy CenterShanghai HospitalShanghai 200093China

Probiotics have great potential in regulating intestinal *** this study,the effects of Lactobacillus plantarum AR495 on the visceral sensitivity and gut microbiota of irritable bowel syndrome(IBS)rats were *** results showed that tryptase released after mast cell activation and degranulation plays a key role in visceral pain,and *** AR495 reduced the stimulation of colonic mast cells and the expression of protease-activated receptor 2(PAR2)and TRPV1 in dorsal root *** further showed that supplementation with *** AR495 increased the level of short-chain fatty acids(SCFAs)and enhanced the barrier function of the *** addition,the microbiota analysis of the colon indicated that *** AR495 promoted the proliferation of Bifidobacterium and inhibited the proliferation of Lachnospiraceae,which alleviated the imbalance of the intestinal microbiota caused by IBS to a certain *** total,*** AR495 might reduce visceral sensitivity through the Mast cell-PAR2-TRPV1 signaling pathway by maintaining the homeostasis of the intestinal barrier.

关键词： Lactobacillus plantarum Irritable bowel syndrome Visceral sensitivity Dorsal root ganglia Tryptase Microbiota

α-Oxoketene Cyclic S, S-cetals Chemistry-Substitution Reaction of α,α'-Dicinnamoyl Ketene Cyclic S, S-Acetals with Ethylenediamine

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Chinese Chemical Letters 1998年第3期9卷 231-232页

作者： Mei Xin ZHAO Qun liU Fu Shun liANG Jing Fu liU Bao Zhong ZHAO lianzhong li (Department of Chemistry, Northeast Normal University, Changchun, 130024)(Department of Chemistry, Jilin Teacher college, Jilin, 131000) Department of Chemistry Northeast Normal University Changchun 130024 China

α,α'-Dicinnamoyl ketene cyclic S, S-acetals 4 were reacted with ethylenediamine to afford α,α'-dicinnamoyl ketene cyclic N,N-acetals 5. This process provides a new method for thesynthesis of 5 in high yield under ... 详细信息

关键词： α,α'-dicinnamoyl ketene cyclic S,S-acetals ethylenediamine substitution reaction,α,α'-dicinnamoyl ketene cyclic N,N-acetals

独立别墅热水供暖系统动态模型、控制策略及能耗分析

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暖通空调 2006年第10期36卷 102-110页

作者：李连众加拿大康克迪亚大学

建立了独立别墅供暖系统的非线性动态模型并分析了其动态特性,介绍了模型降阶方法及PI控制器参数的设计和整定。针对可能的供暖系统控制策略进行了动态仿真和能耗分析。仿真结果表明,单纯采用室外气候补偿控制模式并不能获得理想的控制... 详细信息

建立了独立别墅供暖系统的非线性动态模型并分析了其动态特性,介绍了模型降阶方法及PI控制器参数的设计和整定。针对可能的供暖系统控制策略进行了动态仿真和能耗分析。仿真结果表明,单纯采用室外气候补偿控制模式并不能获得理想的控制效果;采用分室控制模式能满足室内舒适性要求并有一定的节能效果,节能率约为25%。

关键词：热水供暖系统动态模型控制策略能耗分析仿真

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混水供暖系统的动态仿真

暖通空调 2006年第7期36卷 65-71页

作者：李连众加拿大康克迪亚大学

建立了某区域供暖系统的动态模型,分析了系统的动态特性及散热损失、补水率、混水比、太阳辐射及室内得热量对室内温度的影响。模拟了四种不同控制策略下的室温动态变化过程。结果显示,回水温度控制策略不但能满足室温的要求,而且可获得... 详细信息

建立了某区域供暖系统的动态模型,分析了系统的动态特性及散热损失、补水率、混水比、太阳辐射及室内得热量对室内温度的影响。模拟了四种不同控制策略下的室温动态变化过程。结果显示,回水温度控制策略不但能满足室温的要求,而且可获得9.7%的锅炉燃料节能效益。

关键词：区域供暖混水动态模型控制策略仿真能耗分析

Microbiomics and metabolomics insights into the microbial regulation on the formation of flavor components in the traditional fermentation process of Chinese Hongqu aged vinegar

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Food Science and Human Wellness 2024年第5期13卷 2765-2778页

作者： Shangong Tong Wenlong li Yuandong Rao Yanqin Xiao Yingyin Yan Weiling Guo Xucong Lü Jinyuan Sun lianzhong Ai li Ni Institute of Food Science and Technology College of Biological Science and EngineeringFuzhou UniversityFuzhou 350108China Food Nutrition and Health Research Center School of Advanced ManufacturingFuzhou UniversityJinjiang 362200China School of Food Science and Technology Jiangnan UniversityWuxi 214122China Beijing Laboratory for Food Quality and Safety Beijing Technology and Business UniversityBeijing 100048China School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

This study aimed to investigate microbial succession and metabolic dynamics during the traditional fermentation of Hongqu aged vinegar,and explore the core functional microbes closely related to the formation of flavor *** analysis demonstrated that Lactobacillus,Acetobacter,Bacillus,Enterobacter,Lactococcus,Leuconostoc and Weissella were the predominant bacterial genera,while Aspergillus piperis,Aspergillus oryzae,Monascus purpureus,Candida athensensis,***,Penicillium ochrosalmoneum and Simplicillium aogashimaense were the predominant fungal *** analysis revealed that Acetobacter was positively correlated with the production of tetramethylpyrazine,acetoin and acetic acid,Lactococcus showed positive correlation with the production of 2-nonanone,2-heptanone,ethyl caprylate,ethyl caprate,1-hexanol,1-octanol and 1-octen-3-ol,*** and *** were positively associated with the production of diethyl malonate,2,3-butanediyl diacetate,acetoin,benzaldehyde and ***,non-volatile metabolites were also detected through ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry.A variety of amino acids and functional dipeptides were identified during the traditional brewing of Hongqu aged *** analysis revealed that Lactobacillus was significantly associated with DL-lactate,indolelactic acid,D-(+)-3-phenyllactic acid,pimelic acid,pregabalin and 3-aminobutanoic *** study is useful for understanding flavor formation mechanism and developing effective strategies for the suitable strains selection to improve the flavor quality of Hongqu aged vinegar.

关键词： Hongqu aged vinegar Traditional fermentation Microbial dynamics Flavor components Bidirectional orthogonal partial least squares

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