Dynamic Finite Element Model Updating of Prestressed Concrete Continuous Girder Bridge Based on Real-Coded Accelerating Genetic Algorithm

The dynamic finite element model (FEM) of a prestressed concrete continuous girder bridge (PCCGB), named Zhangjiagang river main bridge, was established and updated based on the results of field ambient modal testing using real-coded accelerating genetic algorithm (RAGA), which objective function was defined based on frequency index and correlation coefficient index for evaluating the updated FEM. The dynamic FEM of the bridge was updated based on seven experimental modal parameters. The prediction ability of the updated FEM were evaluated based on three experimental modal parameters. The updated results and prediction ability of updated FEMs indicated that they can reflect adequately the dynamic characteristics of actual PCCGB by using the above objective function and RAGA.     

Hardware in the loop test for plug-in hybrid electric vehicle

Mathematical modes of engine,cooperation of motor and batteries,automatic clutch and vehicle are built with analysis of configuration of plug-in hybrid electric vehicle (PHEV). Specifications of data input and output and signal characters are defined. Hardware in the loop (HIL) system based on MATLAB/xPC for PHEV is built up. The motor/engine drive shift control logic test of PHEV is carried with inputting real acceleration pedal data. Testing results show that automatic clutch acts abnormally. Bugs in control logic are found out. Road test results with revised control logic are very good.     

Modeling and simulation of the upper limb artery system using three section electric network model

A three section electric network model is built for human upper limb arterial system according to the Windkessel model. Blood pressure waveform of brachial artery is inputted into the electric network model. The state space equations of the electric network model are refined by using the state space analysis and solved numerically by the fourth order Runge Kutta method to obtain the blood pressure and flow waveform of radial artery. Effects of changes of the electric network model’s parameters on the blood pressure and flow waveform are also analyzed in normal and different pathological conditions(arteriosc lerosis and hypertension). The results of simulation show that the parameters of the model can well reflect the physiological significations of the upper limb arterial system; the analytic and computational methods are of fairly high precision and fast convergence for the model; and the model can simulate effectively the hemodynamic characteristics of upper limb arteries under normal and different pathological conditions.     

Simulation and design of the processing chamber of high-frequency electromagnetic processor

Processing chamber is an important part of high-frequency electromagnetic water processor. To determine what kind of processing chamber has better effect of antiscaling, the software, Ansoft Maxwell, which is based on the finite element method, is applied to simulate electromagnetic energy distribution in two common processing chambers. One processing chamber is set with coaxial electrodes and the other one is wrapped by spirals. The electromagnetic energy released to water and the distribution of instantaneous energy density of each chamber are compared. According to the simulation analysis, when the same electrical excitation is imposed on the same volume of water, electromagnetic energy of processing chamber with coaxial electrodes is far more than that of processing chamber wrapped by spirals. However, the electromagnetic energy of processing chamber with coaxial electrode decreases from the anode to the cathode, while the electromagnetic energy of processing chamber wrapped by spirals is distributed evenly. These analysis results can be definitely instructive to design the chamber of high-frequency electromagnetic processor.     

氟虫腈饵剂防控红火蚁的田间药效试验

以含0.05％氟虫腈为有效成分与多种天然物质配制饵剂,撒于红火蚁(SolenopsisinvatBuren)蚁巢上,药剂中的引诱剂吸引红火蚁取食,将饵剂带入巢内,并通过红火蚁在巢内交哺喂食行为将药剂传递给其它各品级个体,引起全巢红火蚁中毒死亡.结果表明,0.05％氟虫腈杀蚁饵剂对红火蚁具有良好的控制效果,药后15d开始进入防效高峰期,25～30d防效达到最佳.0.05％氟虫腈杀蚁饵剂药后30d对工蚁的防治效果达93.39％～100.00％;灭巢效果达95.84％～100.00％;药后50d,蚁群级别降低率达83.33％～100.00％,显著优于对照药剂.     

大棚与露地豇豆病虫害发生情况比较

【目的】对设施大棚与露地栽培条件下豇豆病虫害发生情况进行比较分析,为设施大棚病虫害防治及其在海南省的推广应用提供依据。【方法】2010~2011年冬季和2011年春夏季,分别进行露地与设施大棚豇豆栽培试验,调查记录不同季节大棚及露地豇豆斜纹夜蛾、豆荚螟、斑潜蝇、蓟马、叶螨、白粉病、锈病、轮纹病、煤霉病等病虫害发生情况。【结果】大棚内豇豆斜纹夜蛾、豆荚螟、斑潜蝇、蓟马等虫口数略低于露地,其中蓟马在豇豆整个生育期虫口数较高,是危害豇豆的主要害虫;豇豆病害以锈病和轮纹病为主,其中2011年春夏季种植的豇豆锈病和轮纹病明显比2010～2011年冬季重。【结论】设施大棚对豇豆害虫有一定的隔离作用,达到降低害虫虫口基数的目的;但对于病害,露地与设施大棚豇豆病害总体未见太大差异。     

铵态氮肥不同施肥水平对猪毛菜产量及品质的影响

采用田间试验和化学分析相结合的方法研究了铵态氮肥(磷酸二铵)不同施肥水平对猪毛菜产量及品质的影响,以期确定人工栽培猪毛菜的铵态氮肥的合理施肥量。结果表明:随着施肥量的增加,猪毛菜的产量、氨基酸含量、维生素C含量均有不同程度的升高,达到一定施肥量时则呈降低趋势,只有硝酸盐含量达到一定施肥量时陡然降低,之后又升高,为了保证高产优质,人工栽培猪毛菜的铵态氮肥的合理施肥量应为57.5g/m2(或570kg/hm2)左右。     

高原露地萝卜新品种品比试验

在青海地区对引进的12个萝卜新品种进行露地品比试验,比较其地上部生长特性、肉质根性状、产量等性状,以期筛选出综合经济性状良好并适于西宁地区栽培的品种。结果表明:"雪月"、"元光"、"白美人"、"爽月"的综合性状表现较好且产量较高,可作为西宁地区露地萝卜种植的优良品种;"春美丽"的形状为圆球形,肉质颜色为玫红色,而且风味特别好,可作为当地高端市场或特菜种植。     

Effects of lime and ash treatments on ectomycorrhizal infection of Pinus sylvestris L. seedlings planted in a pine forest

A pine forest in the south of Sweden was treated with lime and wood ash. In early June, 12 months after the ash treatment and 18 months after the lime treatment, one year old Pinus syhestris L. seedlings were planted. Four months later six différent ectomycorrhizal types had infected the seedlings in all the treatments. A mycorrhizal type designated “pink”; was more than twice as common in the lime treatments as in the control and ash treatments. Piloderma croceum Erikss. & Hjorts. was significantly more abundant in limed soil than in ash treated soil. The results were compared to those from a bioassy performed in the laboratory, where P. syhestris seedlings had been grown in soil from the same forest. Similar soil pH values in the two studies resulted in different relative infection rates of the mycorrhizal types found. One additional mycorrhizal type, designated “white”; was found in the field experiment. This suggests that mycelial connections to the mature host plants may significantly alter the ability of different fungi to colonize host plant roots in competition with each other compared to when the fungi infect from propagules in the soil.     

冬枣树皮疱斑病防治药剂筛选试验

冬枣树皮疱斑病Phoma persicae是近年在冬枣上新发生的一种重要病害,2009～2011年对其开展了室内抑菌测定和田间防效试验。结果表明,室内抑菌效果较好的药剂为苯醚甲环唑、丙环唑、氟硅唑、苯醚甲环唑.丙环唑、恶唑菌酮.氟硅唑,抑菌率分别为98.7%、96.2%、94.9%、93.6%、92.3%;田间防治效果较好的药剂有苯醚甲环唑、嘧菌酯、氟硅唑、中生菌素,防治效果分别为90.2%、87.1%、80.4%、69.1%,可以在防治冬枣树皮疱斑病生产中推广使用。