JT6120乘客座椅靠背曲线静态舒适性评价研究

The aim of this research was to evaluate a passenger seat of a new type bus in terms of eomfort. A fuzzy set model of multistage comfort scale (MCS) was adopted to the assessment of comfort, together with the techniques of human backshape and EMG measures     

荔枝果实发育过程中细胞分裂素的变化

荔枝果实中含有玉米素、二氢玉米素和二氢核糖基玉米素。果实发育过程中细胞分裂素（ＣＴＫ）含量的动态是：谢花后两周内含量最高，然后下降并稳定在低水平。用外源６一卞基氨基嘌呤（６一ＢＡ）处理，仅在果实发育初期有明显保果作用。果实采后贮藏期间ＣＴＫ含量稳定在低水平；贮藏前用６一ＢＡ处理，能延迟果实衰老，提高果品质量。     

Effect of mate selection on fuzzy selective mating criteria in closed dairy multiple ovulation and embryo transfer nucleus programs

In order to control rates of response and inbreeding, mate selection using fuzzy selective mating criteria (FMC) was investigated in adult multiple ovulation and embryo transfer nucleus schemes for dairy cattle. Stochastic simulation was used to model the closed nucleus scheme. This mate selection was examined in four alternative mating and male selection schemes: (i) a hierarchical scheme; (ii) a hierarchical sibship scheme (two males per sibship); (iii) a factorial scheme (two sires per dam); and (iv) a factorial sibship scheme (two males per sibship and two sires per dam). Genetic response and inbreeding rate tended to be reduced by increasing the trade-off parameter of FMC between the expected breeding value and inbreeding of progeny. Inbreeding rates in all schemes were reduced by reducing the variance of family size through selection and the average coancestry of mating pairs through mate allocation.     

多胺在果实生长发育中的作用研究进展

多胺是广泛存在于植物体内的具有生物学活性的低分子量脂肪族含氮碱。它在植物的胚胎发育、花和果实的发育等生长发育过程具有重要的调控作用,同时在延缓植物衰老和抗逆境等方面也具有重要意义。近几年的研究表明多胺代谢同植物开花坐果、果实发育甚至果实品质特性密切相关。概述了多胺对果实坐果,膨大与衰老等果实发育生理过程的影响,并对多胺在果实逆境发育中的作用进行了探讨,对多胺在果实发育过程中可能的调控作用机理以及外源多胺在植物开花坐果上的应用潜力进行了讨论,并展望了多胺作用分子机理的研究前景。     

Further Contributions to the Development of a Differential Set of Pea Cultivars (Pisum sativum) to Investigate the Virulence of Isolates of Aphanomyces euteiches

Common root rot (Aphanomyces euteiches Drechs.) has become a very destructive disease in the French pea crops since 1993. For an accurate investigation of the virulence variability among French A. euteiches populations and between French and foreign populations, a new set of differential pea genotypes was developed. Thirty-three American and European pea lines, displaying different levels of resistance, were screened in a growth chamber against two French isolates. Symptoms (disease severity from 0 to 5, evaluating symptom surface on roots and epicotyl) and percentage of top fresh weight (inoculated/uninoculated top fresh weight ratio) were measured. From this screening 12 relatively resistant lines, from various genetic backgrounds, were identified along with a highly susceptible control. This set of 13 genotypes was inoculated under controlled conditions with 14 isolates from France, Sweden, USA, Canada and New Zealand, to investigate genotype–isolate interactions. Root symptoms were rated (disease severity), and a susceptibility/resistance threshold was established at disease severity = 1. Significant quantitative interactions were observed, and five 'resistance patterns' were identified, leading to a set of six pea genotypes: Baccara (susceptible), Capella, MN313, 902131, 552 and PI180693. Fields trials of this set in 1999 and 2000 gave the same resistance rankings than in growth chamber conditions. This set will allow more accurate assessments of the variability in virulence/aggressiveness of A. euteiches isolates from France and foreign countries, and further investigations of the epidemiological and genetic basis of pea–A. euteiches interactions.     

水泵机组状态监测与故障诊断系统研究

从20世纪60年代到21世纪，我国的泵站工程为输水、供水以及防洪减灾提供了有力保障。针对水泵机组的状态监测与故障诊断进行研究，建立水泵机组状态监测与诊断的软件及各分析模块与数据库，进行机组性能的预测研究，为水泵机组的状态维修提供支持。     

基于最小数据集的喀斯特不同利用方式下土壤质量评价

为了探究贵州喀斯特区域不同土壤利用方式对土壤质量的影响,我们对该地区的林地、人工草地、天然草地、农田、弃耕地5种土地利用方式下的土壤理化性质进行研究。基于最小数据集对该区域的土壤质量进行评价,构建的最小数据集包括：土壤pH值、容重、全盐、阳离子交换量、全氮、有效铜、有效铁等指标。结果表明：全量数据集和最小数据集获得的土壤质量均表现为林地 > 人工草地 > 天然草地 > 农田 > 弃耕地;人工草地、天然草地、农田、林地的土壤质量等级为二级,位于土壤质量分级中的"较高"水平,弃耕地土壤质量为三级,位于"中等"水平。以上结果表明,人为对自然生态系统的开垦降低了土壤的质量。     

区域农业水资源恢复力可变模糊评价模型

区域农业水资源系统是与自然及人类活动紧密联系的复杂适应系统,不断与周围环境发生物质、能量和信息因素方面的交换和作用。以黑龙江省农垦红兴隆管理局12个农场为研究基点,运用主成分-相关分析法筛选评价指标,构建农业水资源恢复力评价指标体系,采用CRITIC法确定指标权重,结合可变模糊模型评价方法对其农业水资源系统恢复力进行评价,并利用ArcGIS技术对其进行分区,结果表明:双鸭山、八五三、北兴和八五二农场的农业水资源恢复力为Ⅱ级,饶河、二九一、五九七、红旗岭、友谊、江川、宝山和曙光的农业水资源恢复力为Ⅲ级。研究成果揭示了当地农业水资源系统力恢复情况,为农业水资源系统恢复力研究提供了一种新的研究模式。