Data-driven Health Status Prediction of the Hydraulic Turbine Governing System

水轮机调速系统是水轮发电机组的关键控制系统。运用故障树与专家系统相结合的方法对调速系统可能发生的故障进行诊断,并基于历史数据,挖掘与故障相关的可能因素,对专家系统无法解决的故障进行分析,构建了基于数据驱动的水轮机调速系统健康状态预测系统。The hydraulic turbine governing system is the key control system of the hydro-turbine generator unit. In this paper,the fault tree method and the expert system are combined to predict the potential faults of the governing system.Based on the historical data,a data-driven health status prediction system is developed for the hydraulic turbine governing system to detect the possible factors of the faults and analyze the unsolved faults

束缚和异氟烷麻醉对大鼠心率变异性及HPA轴影响的比较

目的为了观察束缚固定和异氟烷(流量:0.8 L,浓度:1.5%)麻醉状态中大鼠的心率变异性的变化;并通过比较9天每天30 min束缚干预和异氟烷麻醉对大鼠的体重、痛阈以及与HPA轴相关激素的影响,来评估长期使用异氟烷麻醉和束缚固定对大鼠应激程度的影响,选择更适宜的大鼠固定方法,为基础医学的实验方法提供重要的参考。方法 SD大鼠随机分为3组:空白组,束缚组,异氟烷麻醉组。急性实验通过记录大鼠心电图15 min,观察束缚固定和异氟烷麻醉情况下大鼠心率,心率变异性的变化。慢性实验中比较连续干预9天(30 min/d)前后3组大鼠体重、痛阈变化以及与应激状态相关激素含量的变化。结果 1)急性试验:与空白组大鼠相比,束缚干预和异氟烷麻醉均造成大鼠心率显著增加,具有统计学意义(P 0.05)。结论以上结果提示:低浓度的异氟烷造成麻醉中大鼠心率增加,心率变异性下降,产生以交感兴奋为主的自主神经功能状态改变。多次束缚固定易造成大鼠HPA轴激活,产生慢性应激的效应。在长期需要固定动物的实验中,与束缚固定相比异氟烷麻醉是更好的固定方法。国家自然科学基金(81674083

电针促进胃黏膜损伤修复的时效关系及分子机制

目的:动态观察电针对胃溃疡模型大鼠胃黏膜损伤修复的影响,探讨电针治疗胃溃疡的时效关系和分子机制。方法:72只SD大鼠分为空白组、模型组、胃经穴组、对照点组,并按干预时间1、4、7 d分为3个亚组,每个亚组6只。采用乙醇灌胃方法制备胃溃疡大鼠模型,胃经穴组电针\"足三里\"\"梁门\",对照点组电针\"梁门\"\"足三里\"外旁开5 mm处,每日1次,每次电针30 min。空白组和模型组用鼠板束缚但不进行电针处理,每日1次,每次30 min。用逆转录-聚合酶链反应(PR-PCR)法检测胃增殖细胞核抗原(PCNA)、P物质(SP)的表达,Western blot检测胃神经降压素(NT)的表达。结果:干预1 d后,模型组溃疡指数显著高于空白组(P0.05),PCNA m RNA、SP m RNA低于模型组(P0.05)。干预7 d后,各组以上指标组间比较差异均无统计学意义(均P>0.05)。结论:电针胃经穴能在胃溃疡发展的不同病理状态下对PCNA m RNA、SP m RNA进行双向调节的平衡作用同时促进NT蛋白高表达,进而促进溃疡的修复。深圳市科技计划项目:JCYJ 20160406140612883;;国家自然科学基金项目:8147375

Dynamics of nutrient and energy for fine roots of Casuarina equisetifolia plantations on coastal sandy soil

2005年1月到2005年11月对福建省惠安县赤湖林场不同林龄木麻黄人工林细根养分和能量的季节动态进行了观测,结果表明:(1)6种元素的含量在不同林龄木麻黄细根中都具有明显的季节变化。各林龄细根的N含量一般在冬夏季节较高,且死细根的N浓度高于相同林龄的活细根,除12林龄活细根P浓度在7月份有最大值外,其他各林龄活、死细根在一年中呈波动性下降,K含量在冬季较高,而在其他季节变化幅度不大,除5林龄活细根和18林龄死细根在3月份和7月份有两个峰值外,其他林龄细根Ca含量随季节变化较小,Mg含量随季节变化总体呈下降趋势,而在11月份上升;各林龄C则呈波浪形变化;(2)随着林龄的增大,细根N、P、Mg含量的变化模式相似,都呈先增加,后降低,再增加的趋势,K和Ca含量变化趋势相似,但变动幅度存在差别,C则呈波浪形变化;(3)随着季节的变化,灰分、干重热值和去灰分热值呈"V"形变动,一年中都存在两个峰值,分别在3月份和7月份或9月份;(4)灰分、干重热值和去灰分热值随林龄的增大表现为波浪形增加。由此可见,不同森林类型的细根养分和能量动态具有季节和林龄的特殊性,在进行整个地区森林生态系统物质循环和能量流动研究时,应考虑不同森林类型的特性。The seasonal dynamics of nutrient and energy of fine roots in C.equisetifolia plantations of different ages was studied at Chihu forestry farm of Hui'an county,Fujian province from January to November in 2005.We obtained the following results:(1)There was significant seasonal dynamics of six elements in the fine roots of different aged C.equisetifolia plantations.N concentration of dead fine roots was higher than that of living fine roots,and was relatively higher in summer and winter.P concentration of fine roots fluctuated with a decreasing trend except for the living fine roots of 12 year-old plantation.K concentration was higher in winter than in the other seasons.The highest Ca concentration in March and July was found in living fine roots of 5 year-old plantation and dead fine roots of 18 year-old plantation,while Ca concentration remained little change for other aged plantations.Mg concentration decreased from January to September and then increased in November.C content fluctuated with time.(2)The similar trend was found for N,P and Mg;and for K and Ca,respectively;C concentration fluctuated with plantation age.(3)The ash content,gross caloric values and ash free caloric values changed with "V" type,and were relatively high in March and July or September,respectively.(4)The ash content,gross caloric values and ash free caloric values tended to increase with the increasing plantation age.It was concluded that the nutrient and energy dynamics of fine roots varied with seasons and plantation ages.To discuss matter cycling and energy flow of forest ecosystems,we should pay attention to these characteristics of different stands.国家“十一五”科技支撑计划资助项目(2006BAB03A14-01);; 福建省科技重大资助项目(2006NZ001-2);; 国家林业局南方山地用材林培育重点实验室资助项目~

Production,decomposition and turnover of fine roots in Casuarina equisetifolia plantation

在福建省惠安县赤湖林场用根钻法和分解袋法对18年生木麻黄人工林细根生物量、分解及周转进行了研究。结果表明,18年生木麻黄活细根生物量平均为6.693 t.hm-2,死细根平均为2.292 t.hm-2,细根生物量具有明显的季节动态,活细根和死细根生物量年变化均为双峰型,活细根生物量峰值出现在1月和7月,死细根出现在3月和7月。用试验期间不同时间数据拟合得到木麻黄细根分解回归方程:x/x0=1.06e-0.0014t。应用模拟方程计算出木麻黄分解1年的干重损失率理论值(35.96%)与实测值(38.19%)较为接近。木麻黄细根半分解时间为537 d,95%分解时间为2 181 d。结合木麻黄人工林在不同季节的细根生物现存量,18年林龄木麻黄细根年死亡量分别为1.825 t.hm-2,年生长量为3.173 t.hm-2,年周转0.474次。The sequential root coring and litter bag technique were used to study fine root biomass,decomposition and turnover in an 18-year-old Casuarina equisetifolia plantation,from Chihu Forestry Farm of Hui'an County.Results show that the average live fine root biomass is 6.693 t·hm-2 and that of dead fine root is 2.292 t·hm-2.Annual dynamic curves of both live and dead fine roots have double apices.Curve peaks of live fine root biomass occur in Jan.and July,while that for dead fine root occur in March and July.The regression equation,based on dry matter decomposition data gained during different experimental periods is:x/x0=1.06e-0.0014t.Theoretic annual dry-weight loss rate of 35.96% calculated from the equation is close to the metrical value of 38.19%.It takes 537 days and 2 181 days to respectively decompose 50% and 95% of the fine roots.Annual mortality of fine roots in the 18-year-old plantation is 1.825 t·hm-2 and annual productivity is 3.173 t·hm-2,with an annual turnover rate of 0.474.国家“十一五”科技支撑计划项目(2006BAB03A14-01);; 福建省科技重大项目(2006NZ0001-2);; 国家林业局南方山地用材林培育重点实验室项目资