应用响应面优化辣木γ-氨基丁酸富集工艺研究

通过富集方式和干燥方法的单因素实验,最陡爬坡试验和响应面设计,优化辣木鲜叶γ-氨基丁酸(γ-aminobutyric acid,GABA)的富集工艺。建立的辣木鲜叶中GABA最适富集条件为辣木鲜叶在45℃下,真空处理34 h,然后50℃干燥。该条件处理的辣木GABA含量为(19.70±0.16)mg/g,是对照的2.63倍。     

BP神经网络在焉耆盆地农田排水量

利用BP神经网络技术对焉耆盆地农田排水量进行预测。利用灰色关联度分析确定了排水量与各影响因素的关系，选取了对排水量影响最大的5个因素作为BP网络的输入，利用均匀设计方法，确定了最优的神经网络结构。估算结果表明利用BP神经网络可以准确的估算农田排水量，最大相对误差仅为-2.45％。     

Avoiding edge effects in agroforestry experiments; the use of neighbour-balanced designs and guard areas

A number of different types of edge effects on experimental plots are defined, and it is shown that they are frequently important in agroforestry experiments. Methods of eliminating edge effects, either at the design or the analysis stage, are described. Computer simulations, based on uniformity data, are used to investigate the efficacy of neighbour-balanced designs, with and without neighbour terms, for reducing the problem of neighbour effects between different treatments. It is concluded that, while neighbour-balanced designs may be useful in certain situations or in combination with other methods, it is preferable to eliminate edge effects by using adequate guard rows. Recommendations are therefore made concerning the correct use of guard areas in agroforestry experimentation.     

3种生长调节物质对生菜不定芽直接再生的影响

应用“３１１－Ｂ”回归最优设计研究ＡｇＮＯ３，ＡＢＡ，ＡＳＡ对生菜离体培养不定芽直接再生的影响。结果表明，ＡｇＮＯ３是良好的乙烯抑制剂，与ＡＢＡ配合使用可明显抑制愈伤产生，大大促进不定芽的直接再生；而ＡＳＡ未曾抑制愈伤产生，不是乙烯抑制剂。     

Marker-assisted selection efficiency in multiple connected populations: a simulation study based on the results of a QTL detection experiment in maize

Many studies already investigated marker-assisted selection (MAS) efficiency but mainly in biparental populations. Connected multiparental populations address a broader diversity and confer a gain of power for QTL detection which must be beneficial for MAS. Our objective was to compare multiparental connected designs to biparental populations taken separately for MAS and phenotypic selection. We first detected QTL for flowering time and grain yield in an experimental maize design involving four parental inbred lines crossed to produce six different biparental populations and confirmed the advantage of multiparental connected designs over biparental populations for QTL detection. Based on these results we performed stochastic simulations to evaluate the expected efficiency of four generations of MAS and phenotypic selection. Different parameters were considered: trait heritability, genetic architecture and whether QTL were assumed to be known or have to be detected. Genetic gains were higher in the multiparental design than on average over the biparental populations considered separately, especially when favourable alleles were equally distributed among parental lines. When QTL detection was included in the simulation process, we found that type I error risk considered for declaring QTL as significant should be adapted to the design. Type I error risks leading to the best response were higher for the biparental populations than for the multiparental design. Besides addressing a broader diversity, multiparental designs increase the power of QTL detection, which reinforces their superiority over biparental designs for MAS. Application of MAS to multiparental designs therefore appears promising to accelerate genetic gain in plant breeding programs.     

湖南教育报刊社新址景观环境设计

本着对资源的保护与利用、历史文化的延续和景观再生的设计指导思想,针对湖南教育报刊社的发展历史和其新址的自然条件与景观特色,以尊重自然、传承历史文化、创造“天人合一”的人居环境为设计理念,对湖南教育报刊社新址景观环境设计的设计目标和主要设计内容进行了阐述.     

居住区水景设计探讨

通过对一些居住区的水景设计进行分析、归纳和总结,提出了点状空间的水景、线状空间的水景、面状空间的水景在居住区中的设计理念,在此基础上对武汉市区的"楚风小区"、"常青花园"两个居住区的水景设计作出了规划构想.     

继电保护用电流互感器的暂态特性数字仿真及电磁优化设计

本文在分析CT的暂态特性及其动态磁化过程的基础上,建立了计及铁芯饱和、局部磁滞回环、动态剩磁影响的CT单、复励磁暂态过程数字仿真模型,提出了继电保护用P、TPX、TPY、TPz级CT的电磁优化设计方法,编制了计算机程序,用于CT的电磁优化设计及数字仿真分析.     

Precision of estimated QTL positions in granddaughter designs using combined haplotype sharing TDT and linkage analysis

The aim of this study was to develop the linear haplotype sharing transmission disequilibrium test (LHS-TDT) method and combine this method with the simple regression method to estimate the precision of QTL positions in granddaughter designs. This precision was determined by Monte Carlo simulation in granddaughter designs. A single bi-allelic QTL at the midpoint of a linkage group and 26 markers with 1 cM intervals and with two alleles each were simulated. Three linear models, (i.e. the simple regression model, the linear haplotype sharing TDT method and the combination of these two models) were compared. The mean of absolute differences (A) between the estimated and true QTL position of each method was considered for six different scenarios consisting of combinations of a number of markers and the most frequent haplotypes. The mean of A, using the simple regression method, was 4.38 centimorgan (cM). The means of A using the LHS-TDT method were less than the simple regression method in all scenarios and ranged from 1.86 to 3.82 cM depending on the scenario. The mean of A using the combined method was more than the LHS-TDT method and less than the simple regression method. The means of A using the combined method ranged from 2.32 to 4.36 cM. Therefore, for populations similar to those population simulated in this study, the LHS-TDT was better than the simple regression method and the combined method for precision of estimated QTL position in granddaughter designs.     

盘形振动上料器的一种系统模型和模拟

推导出一种盘形振动上料器的数学模型,在此基础上分析了固有频率、振型等动态性能,进行了系统参数计算。并利用动态分析软件ADAMS进行了建模仿真,可直观地研究零件的一致化排列过程和输送的速度。实践证明,利用这种模型进行盘形振动上料器的研制工作十分有效。