Vacuum Circuit Breaker''s Condition Simulation Based on Artificial Neural Network and Electrical Endurance Quality Criterion

How to select the factors that have more great affection on the condition based maintenance and how to make sure the relation among them are two key problems. A new method's proposed for vacuum circuit breaker's condition based maintenance, which combines electrical endurance quality criterions and condition recognition arithmetic based on artificial neural network. The paper proposes a model based on electrical-endurance quality criterions by applying ANN in vacuum circuit breaker's condition based maintenance. The simulation indicates that the criterion selected in this way are reasonable and the network with new learning error function has a much better generalization ability.     

基质添加菌剂对黄瓜幼苗低温贮藏特性的影响

利用分别添加FZB-42、GM及Bio菌剂的基质培育黄瓜幼苗,研究其在12℃低温下贮藏3、6、9、12d后黄瓜幼苗叶绿素含量、净光合速率、生物量以及贮藏后光合速率恢复情况等.结果表明:FZB-42和Bio能增加黄瓜幼苗叶绿素含量,保持较高的光合速率,黄瓜幼苗低温贮藏后其光合速率能较快地恢复到正常生长植株的水平.同时,F...     

芒果叶片组织的细胞结构与耐寒性的初步研究

通过夏季对芒果50个栽培品种叶片的解剖观测,从中选出解剖结构差异较大的8个品种在冬季重复解剖观测及进行叶片电导率测定,结果表明,芒果叶片细胞结构存在下部紧密组织,且叶片组织结构的紧密度与品种耐寒性有密切关系。单一的栅栏组织、海绵组织或下部紧密组织的厚度,在同一品种的不同季节出现较大的差异,但其紧密度大小的排序能够保持相对的稳定,因此有可能成为耐寒性的鉴定指标。     

4种雀稗种子萌发期耐盐性的测定

用不同浓度的盐溶液处理4种雀稗种子,以研究不同盐浓度对各种雀稗种子相对发芽势、相对发芽率、相对胚芽、相对胚根的影响。结果表明,低盐浓度处理对部分雀稗种子萌发、胚芽、胚根的生长和发芽势都有一定的促进作用;随着盐处理浓度增高,发芽率和发芽势呈下降趋势,胚芽、胚根的生长也受到抑制,但也有例外。不同浓度的盐胁迫下雀稗种子的适应情况不同,同一雀稗种子在萌发时对不同盐浓度的适应情况也不同。     

Quantitative analysis of short‐ and long‐distance racing performance in young and adult horses and association analysis with functional candidate genes in Spanish Trotter horses

The association of five candidate genes with sporting performance in young and adult Spanish Trotter horses (STHs) was performed according to a previous selection based on quantitative analysis of the trait time per kilometre (TPK). A total of 334 516 records of TPK from 5958 STHs were used to estimate the estimated breeding values (EBVs) at different age groups (young and adults horses) throughout the range of distances (1600–2700 m) using a bicharacter random regression model. The heritability estimated by distance ranged from 0.16 to 0.40, with a different range for the two age groups. Considering the animals with the best and the worst deregressed EBV, 321 STHs were selected for SNP genotyping in MSTN, COX4I2, PDK4, DMRT3 and CKM genes. An association analysis based on ridge and logistic regression revealed that the young trotters with genotype GG in PDK4 (p < 0.05) and AA of DMRT3 (p < 0.001) SNPs show the best potential in short‐distance races, while those carrying the genotype AA in DMRT3 (p < 0.001) and CC in CKM (p < 0.05) genes seem to be the best in long‐distance races. Adult trotters with genotype AA in DMRT3 also display greater speed (p < 0.05) and endurance (p < 0.001).     

Genetic parameter estimation for long endurance trials in the Uruguayan Criollo horse

The aim of this study was to estimate the genetic parameters of performance in a 750‐km, 15‐day ride in Criollo horses. Heritability (h²) and maternal lineage effects (mt²) were obtained for rank, a relative placing measure of performance. Additive genetic and maternal lineage (rmt) correlations among five medium‐to‐high intensity phase ranks (pRK) and final rank (RK) were also estimated. Individual records from 1,236 Criollo horses from 1979 to 2012 were used. A multivariate threshold animal model was applied to the pRK and RK. Heritability was moderate to low (0.156–0.275). Estimates of mt² were consistently low (0.04–0.06). Additive genetic correlations between individual pRK and RK were high (0.801–0.924), and the genetic correlations between individual pRKs ranged from 0.763 to 0.847. The pRK heritabilities revealed that some phases were explained by a greater additive component, whereas others showed stronger genetic relationships with RK. Thus, not all pRK may be considered as similar measures of performance in competition.     

温度与鳜仔鱼饥饿耐力的关系

从鳜仔鱼在饥饿状态下的生长速度、摄食率、抵达PNR的时间几个方面研究温度与仔鱼饥饿耐力的关系。实验表明,不同温度下仔鱼的生长速度从大到小依次为：25℃＞30℃＞28℃＞31℃＞19．5℃;抵太PNR的时间从长到短依次为25℃＞28℃＞19．5℃＞30℃＞31℃;摄食率高低依次为25℃＞28℃＞19．5℃＞30℃＞31℃。可见,随温度的升高,仔鱼的饥饿耐力也显著提高,但超过28℃后,仔鱼对饥饿耐受力急剧下降,在25℃,仔鱼对饥饿的耐受力最高。     

耐湿高产小麦品种济宁12选育

描述了耐湿高产小麦品种济宁12号的选育过程,对其丰产、稳产性进行了分析,并总结了该品种选育成功的经验。认为提高茎秆质量、弹性,合理株型,合理组配亲本是品种选育成功的关键。     

3种植物对人工污水中铬和铅的耐受性研究

通过营养液添加不同浓度的铅和铬进行水培植物,研究了美人蕉、风车草和狼尾草对铅(Pb2 )和铬(Cr6 )的耐受能力,结果表明:在铬和铅2.0mg/L低浓度下,就都能对3种植物的株高、生物质量产生一定的抑制作用,同种处理下,3种植物的地下部重金属累积量均高于地上部,并且随着Cr、Pb处理浓度的增大其累积量升高。但是不同植物对重金属元素的耐忍性有较大的差屿,相比之下,对铬和铅的耐受性顺序均为:美人焦>风车草>狼尾草。     

苹果绵蚜耐饥饿能力研究

【目的】明确苹果绵蚜在饥饿状态下的存活能力和温、湿度对苹果绵蚜耐饥饿能力的影响。【方法】在实验室控制条件下,研究苹果绵蚜不同虫态及其在供食叶片、供食枝条(只供食叶片和枝条,但不保湿、不更换)、完全饥饿(空白对照,不提供食物)3种处理下的耐饥饿能力,以及完全饥饿条件下不同温度(15~31℃)、湿度(40%~80%)对苹果绵蚜耐饥饿能力的影响。【结果】苹果绵蚜低龄若蚜存在逃逸现象,表现出较强的活动能力。苹果绵蚜的耐饥饿能力由强到弱依次为4龄若蚜>雌成蚜>3龄若蚜>2龄若蚜>1龄若蚜;不同处理的耐饥饿能力表现为供食枝条>供食叶片>空白对照。在饥饿条件下,苹果绵蚜的存活率随饥饿时间的延长而降低,且均呈初期缓慢、中间较快、后期缓慢的下降趋势。在温度为15~31℃时,温度越高,苹果绵蚜的耐饥饿能力越弱;在湿度为40%~80%时,湿度越低,其耐饥饿能力也越弱。【结论】苹果绵蚜特别是4龄若蚜具有较强的耐饥饿能力,对恶劣环境具有较强的耐受性,即使在恶劣的环境条件下也具有传播扩散的潜在危险,环境对苹果绵蚜的耐饥饿能力影响较大。