Analysis on the Current Phase Compensation in Differential Protection for Transformer

分析了接线双绕组变压器微机差动保护相位补偿采用角接与算法相位补偿关系,变压器差动保护内部两相短路故障灵敏度与相位补偿关系,得出无论变压器中性点是否接地,相位补偿选择低压侧的方案对差动保护灵敏度有利。This paper analyzes the relationship between angle-connection phase compensation and the algorithm phase compensation using in the current phase compensation in differential protection forWiring two-winding transformer microcomputer,and the relationship between the two phase short circuit fault sensitivity and phase compensation in differential protection for transformer,and then concludes that whether the transformer neutral point grounds or not,phase compensation choosing the plan of low voltage is good for the differential protection sensitivity

Determination of Chemical Constituents of the Essential Oil from the Root of Cunninghamia lanceolata

用干馏工艺扩试提取杉根精油,干馏釜3m3,干馏温度105～420℃,时间6.0h,产品得率为6.08%,是水蒸气蒸馏提取方法的3倍。产品相对密度(25℃)为0.9912～1.021,折射率nD20为1.4799,旋光度+0.5°。应用GC法对100～250℃的精油化学成分进行了分析,分出41个色谱峰,共鉴定出39个化合物,占该精油总质量的99.16%,其中主要成分为α-蒎烯3.8010%(质量分数,下同),d-柠檬烯2.8893%,β-松油烯7.1880%,长叶烯10.4162%,β-石竹烯4.2064%,α-木罗烯3.017%,β-松油醇2.876%,β-榄香烯4.5719%,柏木醇31.5087%,愈创木醇6.1426%,实验结果表明,精油化学成分及含量因树龄、树的部位、提取工艺不同,差异很大。The essential oil of the root of Cunninghamia lanceolata was extracted in industrial-scale test retort volume 3 m3 by destructive distillation under the carbonization temperature of 105～420 ℃ during the period of six hours.Yield of the oil is 6.08%,three times that by hydrodistillation.Density of the oil(25 ℃) is 0.9912～1.021 and refractive index(20 ℃) is 1.4799,optical rotation is+0.5°.Through GC,39 compounds were identified,amounting to 99.16%of the chromatographic peak area.The major components are α-pinene 3.801%(mass fraction),d-limonene 2.889 3%,β-terpinene 7.188 0%,longifolene 10.416 2%,β-caryophyllene 4.206 4%,α-muulorene 3.017%,β-terpineol 2.876%,β-elemene 4.571 9%,cedar camphor 31.508 7% and guaiol 6.142 6%.The result shows that the constituents of the essential oil change with the age and position of the tree and the extraction technics.福建省自然科学基金(z0513018)~

Electrodeposition of Active Platinum on Stainless Steel

采用低毒、较缓和条件下预处理不锈钢基底 ,在电沉积过程中引入超声波振荡技术 ,并筛选出最佳电流密度组合进行电沉积 ,制备出与基底粘结牢固、析氢电催化性能高的不锈钢镀铂电极。从电极的双层电容值可推出电极活性的改善主要归因于表面粗糙度的增加。The substrate of stainless steel was pretreated under low toxic and moderate conditions. Ultrasonic agitation technology was employed in the process of electodeposition. In addition, the optimal combination of current densities was selected. As a result, platinum plated stainless steel electrode which not only was adherent to the substrate but also possessed excellent electrocatalyticproperty for HER was prepared. It can be deduced from the measured values of the double layer capacity of the electrode that the improvement of the electrode activity was mainly due to the increase in surface roughness of the electrode.厦门大学固体表面物理化学国家重点实验室资助!课题 ( 950 1

GeSi/Si多层异质外延载流子浓度的分布

通过实验研究了一种与Ge_xSi_(1-x)合金表面具有良好电化学界面的电解液，利用电化学C-V方法研究了多层Ge_xSi_(1-x)/Si异质外延材料的载流子浓度纵向分布。实验结果表

Suppressive Capacity of Compost Extracts and Compost Tea Against the Root-knot Nematode Meloidogyne javanica on Tomato in Potting Tests

利用腐熟堆肥的浸提液(1∶3,W/V)和由浸提液制备的堆肥茶作为盆栽番茄的液态肥,以评估其对爪哇根结线虫(Meloidogyne javanica)种群的影响。盆栽番茄苗并于4周龄时接种根结线虫第二期幼虫(J2)。试验期间用30%稀释的堆肥浸提液和堆肥茶原液淋灌。与对照组相比,在接种35 d后,堆肥茶使根部的根结数量约下降56.9%,土壤和根中的线虫数量分别下降了45.5%和33.9%;接种70 d后,根结数量约下降51.4%,土壤和根中的线虫数量分别下降了49.4%和66.3%。随着堆肥浸提物和堆肥茶使用浓度的增加,根结数量和最终种群数量均呈指数降低,堆肥茶的效果略优于浸提液。The use of compost extraction(1/3,W/V)and compost tea as an amendment to potting mixtures were assessed for the management of Meloidogyne javanica.Amending the potting mixture with compost tea diluted at rate of 30 %(V/V) reduced the root galling(56.9 %) and final nematode population(45.5 % in soil and 33.9 % in root separately) of M javanica in tomato as compared with the control at 35 d after inoculation.70 d later,root galling and final nematode population reduced by 51.4 %,49.4 %,and 66.3 % respectively.In tomato,increasing the rate of compost extraction or compost tea exponentially reduced the root galling and final population of M javanica.A reasonable control effect will be achieved by employing the compost tea at rate of 30~40% dilution (V/V).厦门市科技计划项目(3502Z20041061

一种家庭用新型多姿态多运动形式手臂关节训练器械的设计

针对中国老龄化速度进一步加快，老年人由于缺乏有效的锻炼，肩、肘、腕关节经常会出现酸、疼、痛等现象，研制了一种家庭用新型多姿态多运动形式手臂关节训练器械。通过理论设计计算，并基于NX对无急回四杆机构进行了正向运动学分析比较，确定了3组杆长参数（分别对应2种姿态、3种不同运动形式、9种不同运动参数）作为设计方案；根据设计方案对手臂关节训练器械进行了力平衡、载荷变化分析；根据理论设计计算及NX虚拟样机动态仿真分析数据，试制并测试了训练器械物理样机的性能。结果表明，训练器械安全、可靠、舒适，人体肩、肘、腕和腰关节都能得到较好的训练

Effects of K~+ Level in Composts on Parasitism by Root-knot Nematode Meloidogyne javanica

利用茶叶渣、生活污泥和猪粪为原料按不同比例充分混合并进行强制好氧静态发酵,得到C/N在11~17之间的腐熟堆肥,分别以它们作为盆栽番茄的土壤有机添加物,以评估其在控制爪哇根结线虫形成根结中的作用.从堆肥中的N、P和K与根结数之间的关系看,基本上呈现出随堆肥中氮和磷含量的增加,根结数量下降的趋势.在相对低K含量范围内,根结数随K含量的升高而下降;而在相对高K含量范围内,根结数却随K含量的增加而增加,氮钾比在1~2之间时的抑制效果最好.与对照组相比较,用添加比例在30%~50%的腐熟堆肥可以明显减少根结线虫在番茄上的根结数量,而且随着添加比例的增加,根结数量呈指数下降.Well decomposed composts with C: N ratios and N-P2O5-K2O levels were obtained to study the efficiency and limiting factor of compost in suppression of parasitism by Meloidogyne javanica on tomatoes in pot test.The best suppressiveness was observed in those composts with N/K ratios between 1 and 2,while the others with much lower or higher N/K2O ratios show less efficient in prohibition from parasitism by nematode.The results suggested that different K+ levels in the composts may explain part of the varied efficiency of suppression in this study and the plants might benefit from increasing K+ levels in the composts.A dose-response activity was obtained and the reduction of root galling could be described by a negative exponential function with increasing rates of composts in the potting soil.General factorial analysis showed that suppressant capability was independent of the kinds of compost amended,and no interactions between compost and treatment levels.厦门市科技项目(3502Z20041061)资

Temperature monitoring system for HV bus-bar based on wireless networking

针对高压开关柜的高压、强电磁场的工作环境,本文设计一种基于ZigBee无线网络技术的高压开关柜母线测温系统。该系统由温度在线监测显示设备和温度终端采集设备两部分构成,温度终端采集设备采用耐腐蚀绝缘技术,直接将其安装在被测母线上进行温度采集,并将母线上采集到的温度以无线的方式传递给温度在线监测显示设备。由于每个开关柜内每条母线上的温度终端采集设备都被分配固定的地址,所以温度在线监测显示设备能将接收到的数据进行分析处理后,直接在液晶上实时在线显示开关柜内对应地址的温度数据。当采集的温度数据超过系统设定阈值时,显示装置发出声光报警信号,从而使用户提前发现和排除热故障隐患。 &nbsp